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Annotation of src/sys/arch/i386/i386/locore.S, Revision 1.31.6.2

1.31.6.2! yamt        1: /*     $NetBSD: locore.S,v 1.31.6.1 2005/02/13 10:47:14 yamt Exp $     */
1.1       fvdl        2:
                      3: /*-
1.31.6.2! yamt        4:  * Copyright (c) 1998, 2000, 2004 The NetBSD Foundation, Inc.
1.1       fvdl        5:  * All rights reserved.
                      6:  *
                      7:  * This code is derived from software contributed to The NetBSD Foundation
                      8:  * by Charles M. Hannum.
                      9:  *
                     10:  * Redistribution and use in source and binary forms, with or without
                     11:  * modification, are permitted provided that the following conditions
                     12:  * are met:
                     13:  * 1. Redistributions of source code must retain the above copyright
                     14:  *    notice, this list of conditions and the following disclaimer.
                     15:  * 2. Redistributions in binary form must reproduce the above copyright
                     16:  *    notice, this list of conditions and the following disclaimer in the
                     17:  *    documentation and/or other materials provided with the distribution.
                     18:  * 3. All advertising materials mentioning features or use of this software
                     19:  *    must display the following acknowledgement:
                     20:  *        This product includes software developed by the NetBSD
                     21:  *        Foundation, Inc. and its contributors.
                     22:  * 4. Neither the name of The NetBSD Foundation nor the names of its
                     23:  *    contributors may be used to endorse or promote products derived
                     24:  *    from this software without specific prior written permission.
                     25:  *
                     26:  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
                     27:  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
                     28:  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
                     29:  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
                     30:  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
                     31:  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
                     32:  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
                     33:  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
                     34:  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
                     35:  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
                     36:  * POSSIBILITY OF SUCH DAMAGE.
                     37:  */
                     38:
                     39: /*-
                     40:  * Copyright (c) 1990 The Regents of the University of California.
                     41:  * All rights reserved.
                     42:  *
                     43:  * This code is derived from software contributed to Berkeley by
                     44:  * William Jolitz.
                     45:  *
                     46:  * Redistribution and use in source and binary forms, with or without
                     47:  * modification, are permitted provided that the following conditions
                     48:  * are met:
                     49:  * 1. Redistributions of source code must retain the above copyright
                     50:  *    notice, this list of conditions and the following disclaimer.
                     51:  * 2. Redistributions in binary form must reproduce the above copyright
                     52:  *    notice, this list of conditions and the following disclaimer in the
                     53:  *    documentation and/or other materials provided with the distribution.
1.12      agc        54:  * 3. Neither the name of the University nor the names of its contributors
1.1       fvdl       55:  *    may be used to endorse or promote products derived from this software
                     56:  *    without specific prior written permission.
                     57:  *
                     58:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
                     59:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     60:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     61:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
                     62:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     63:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     64:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     65:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     66:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     67:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     68:  * SUCH DAMAGE.
                     69:  *
                     70:  *     @(#)locore.s    7.3 (Berkeley) 5/13/91
                     71:  */
                     72:
1.18      christos   73: #include "opt_compat_netbsd.h"
                     74: #include "opt_compat_oldboot.h"
1.1       fvdl       75: #include "opt_cputype.h"
                     76: #include "opt_ddb.h"
                     77: #include "opt_ipkdb.h"
1.18      christos   78: #include "opt_lockdebug.h"
1.1       fvdl       79: #include "opt_multiprocessor.h"
                     80: #include "opt_realmem.h"
1.18      christos   81: #include "opt_user_ldt.h"
                     82: #include "opt_vm86.h"
1.1       fvdl       83:
                     84: #include "npx.h"
                     85: #include "assym.h"
                     86: #include "apm.h"
                     87: #include "lapic.h"
                     88: #include "ioapic.h"
1.8       fvdl       89: #include "ksyms.h"
1.1       fvdl       90:
                     91: #include <sys/errno.h>
                     92: #include <sys/syscall.h>
                     93:
                     94: #include <machine/cputypes.h>
                     95: #include <machine/param.h>
                     96: #include <machine/pte.h>
                     97: #include <machine/segments.h>
                     98: #include <machine/specialreg.h>
                     99: #include <machine/trap.h>
                    100: #include <machine/bootinfo.h>
                    101:
                    102: #if NLAPIC > 0
                    103: #include <machine/i82489reg.h>
                    104: #endif
                    105:
                    106: /* LINTSTUB: include <sys/types.h> */
                    107: /* LINTSTUB: include <machine/cpu.h> */
                    108: /* LINTSTUB: include <sys/systm.h> */
                    109:
                    110: #include <machine/asm.h>
                    111:
                    112: #if defined(MULTIPROCESSOR)
1.30      junyoung  113:
1.5       thorpej   114: #define SET_CURLWP(lwp,cpu)                            \
1.1       fvdl      115:        movl    CPUVAR(SELF),cpu                ;       \
1.5       thorpej   116:        movl    lwp,CPUVAR(CURLWP)      ;       \
                    117:        movl    cpu,L_CPU(lwp)
1.30      junyoung  118:
1.1       fvdl      119: #else
                    120:
1.5       thorpej   121: #define SET_CURLWP(lwp,tcpu)           movl    lwp,CPUVAR(CURLWP)
                    122: #define GET_CURLWP(reg)                        movl    CPUVAR(CURLWP),reg
1.1       fvdl      123:
                    124: #endif
                    125:
1.30      junyoung  126: #define GET_CURPCB(reg)                        movl    CPUVAR(CURPCB),reg
1.1       fvdl      127: #define SET_CURPCB(reg)                        movl    reg,CPUVAR(CURPCB)
1.24      yamt      128:
1.1       fvdl      129: #define CLEAR_RESCHED(reg)             movl    reg,CPUVAR(RESCHED)
                    130:
                    131: /* XXX temporary kluge; these should not be here */
                    132: /* Get definitions for IOM_BEGIN, IOM_END, and IOM_SIZE */
                    133: #include <dev/isa/isareg.h>
                    134:
                    135:
                    136: /* Disallow old names for REALBASEMEM */
                    137: #ifdef BIOSBASEMEM
                    138: #error BIOSBASEMEM option deprecated; use REALBASEMEM only if memory size reported by latest boot block is incorrect
                    139: #endif
                    140:
                    141: /* Disallow old names for REALEXTMEM */
                    142: #ifdef EXTMEM_SIZE
                    143: #error EXTMEM_SIZE option deprecated; use REALEXTMEM only if memory size reported by latest boot block is incorrect
                    144: #endif
                    145: #ifdef BIOSEXTMEM
                    146: #error BIOSEXTMEM option deprecated; use REALEXTMEM only if memory size reported by latest boot block is incorrect
                    147: #endif
                    148:
                    149: #include <machine/frameasm.h>
                    150:
                    151:
                    152: #ifdef MULTIPROCESSOR
                    153: #include <machine/i82489reg.h>
                    154: #endif
1.30      junyoung  155:
1.31      junyoung  156: /* This shouldn't conflict with a macro of the same name defined in pmap.h */
                    157: #define PTE_BASE       (PDSLOT_PTE << PDSHIFT)
1.1       fvdl      158:
                    159: /*
                    160:  * Initialization
                    161:  */
                    162:        .data
                    163:
                    164:        .globl  _C_LABEL(cpu)
                    165:        .globl  _C_LABEL(esym),_C_LABEL(boothowto)
                    166:        .globl  _C_LABEL(bootinfo),_C_LABEL(atdevbase)
                    167: #ifdef COMPAT_OLDBOOT
                    168:        .globl  _C_LABEL(bootdev)
                    169: #endif
1.31      junyoung  170:        .globl  _C_LABEL(proc0paddr),_C_LABEL(PDPpaddr)
1.1       fvdl      171:        .globl  _C_LABEL(biosbasemem),_C_LABEL(biosextmem)
                    172:        .globl  _C_LABEL(gdt)
                    173: #ifdef I586_CPU
                    174:        .globl  _C_LABEL(idt)
                    175: #endif
1.30      junyoung  176:        .globl  _C_LABEL(lapic_tpr)
                    177:
1.1       fvdl      178: #if NLAPIC > 0
                    179: #ifdef __ELF__
1.7       thorpej   180:        .align  PAGE_SIZE
1.1       fvdl      181: #else
                    182:        .align  12
                    183: #endif
                    184:        .globl _C_LABEL(local_apic), _C_LABEL(lapic_id)
                    185: _C_LABEL(local_apic):
                    186:        .space  LAPIC_ID
1.30      junyoung  187: _C_LABEL(lapic_id):
1.1       fvdl      188:        .long   0x00000000
                    189:        .space  LAPIC_TPRI-(LAPIC_ID+4)
1.30      junyoung  190: _C_LABEL(lapic_tpr):
1.1       fvdl      191:        .space  LAPIC_PPRI-LAPIC_TPRI
1.30      junyoung  192: _C_LABEL(lapic_ppr):
1.1       fvdl      193:        .space  LAPIC_ISR-LAPIC_PPRI
                    194: _C_LABEL(lapic_isr):
1.7       thorpej   195:        .space  PAGE_SIZE-LAPIC_ISR
1.1       fvdl      196: #else
1.30      junyoung  197: _C_LABEL(lapic_tpr):
1.1       fvdl      198:        .long 0
                    199: #endif
1.30      junyoung  200:
1.1       fvdl      201:
                    202: _C_LABEL(cpu):         .long   0       # are we 386, 386sx, or 486,
                    203:                                        #   or Pentium, or..
                    204: _C_LABEL(esym):                .long   0       # ptr to end of syms
                    205: _C_LABEL(atdevbase):   .long   0       # location of start of iomem in virtual
                    206: _C_LABEL(proc0paddr):  .long   0
1.31      junyoung  207: _C_LABEL(PDPpaddr):    .long   0       # paddr of PDP, for libkvm
1.1       fvdl      208: #ifndef REALBASEMEM
                    209: _C_LABEL(biosbasemem): .long   0       # base memory reported by BIOS
                    210: #else
                    211: _C_LABEL(biosbasemem): .long   REALBASEMEM
                    212: #endif
                    213: #ifndef REALEXTMEM
                    214: _C_LABEL(biosextmem):  .long   0       # extended memory reported by BIOS
                    215: #else
                    216: _C_LABEL(biosextmem):  .long   REALEXTMEM
                    217: #endif
1.30      junyoung  218:
1.1       fvdl      219:        .space 512
                    220: tmpstk:
                    221:
                    222:
1.13      christos  223: #define        _RELOC(x)       ((x) - KERNBASE_LOCORE)
1.1       fvdl      224: #define        RELOC(x)        _RELOC(_C_LABEL(x))
                    225:
                    226:        .text
                    227:        .globl  _C_LABEL(kernel_text)
                    228:        .set    _C_LABEL(kernel_text),KERNTEXTOFF
                    229:
                    230:        .globl  start
                    231: start: movw    $0x1234,0x472                   # warm boot
                    232:
                    233:        /*
                    234:         * Load parameters from stack
                    235:         * (howto, [bootdev], bootinfo, esym, basemem, extmem).
                    236:         */
                    237:        movl    4(%esp),%eax
                    238:        movl    %eax,RELOC(boothowto)
                    239: #ifdef COMPAT_OLDBOOT
                    240:        movl    8(%esp),%eax
                    241:        movl    %eax,RELOC(bootdev)
                    242: #endif
                    243:        movl    12(%esp),%eax
                    244:
                    245:        testl   %eax, %eax
                    246:        jz      1f
                    247:        movl    (%eax), %ebx            /* number of entries */
                    248:        movl    $RELOC(bootinfo), %edi
                    249:        movl    %ebx, (%edi)
                    250:        addl    $4, %edi
                    251: 2:
                    252:        testl   %ebx, %ebx
                    253:        jz      1f
                    254:        addl    $4, %eax
                    255:        movl    (%eax), %ecx            /* address of entry */
                    256:        pushl   %eax
                    257:        pushl   (%ecx)                  /* len */
                    258:        pushl   %ecx
                    259:        pushl   %edi
                    260:        addl    (%ecx), %edi            /* update dest pointer */
                    261:        cmpl    $_RELOC(_C_LABEL(bootinfo) + BOOTINFO_MAXSIZE), %edi
                    262:        jg      2f
                    263:        call    _C_LABEL(memcpy)
                    264:        addl    $12, %esp
                    265:        popl    %eax
                    266:        subl    $1, %ebx
                    267:        jmp     2b
                    268: 2:     /* cleanup for overflow case */
                    269:        addl    $16, %esp
                    270:        movl    $RELOC(bootinfo), %edi
                    271:        subl    %ebx, (%edi)            /* correct number of entries */
                    272: 1:
                    273:
                    274:        movl    16(%esp),%eax
                    275:        testl   %eax,%eax
                    276:        jz      1f
1.13      christos  277:        addl    $KERNBASE_LOCORE,%eax
1.1       fvdl      278: 1:     movl    %eax,RELOC(esym)
                    279:
                    280:        movl    RELOC(biosextmem),%eax
                    281:        testl   %eax,%eax
                    282:        jnz     1f
                    283:        movl    20(%esp),%eax
                    284:        movl    %eax,RELOC(biosextmem)
                    285: 1:
                    286:        movl    RELOC(biosbasemem),%eax
                    287:        testl   %eax,%eax
                    288:        jnz     1f
                    289:        movl    24(%esp),%eax
                    290:        movl    %eax,RELOC(biosbasemem)
                    291: 1:
                    292:
                    293:        /* First, reset the PSL. */
                    294:        pushl   $PSL_MBO
                    295:        popfl
                    296:
                    297:        /* Clear segment registers; always null in proc0. */
                    298:        xorl    %eax,%eax
                    299:        movw    %ax,%fs
                    300:        movw    %ax,%gs
                    301:        decl    %eax
                    302:        movl    %eax,RELOC(cpu_info_primary)+CPU_INFO_LEVEL
                    303:
                    304:        /* Find out our CPU type. */
                    305:
                    306: try386:        /* Try to toggle alignment check flag; does not exist on 386. */
                    307:        pushfl
                    308:        popl    %eax
                    309:        movl    %eax,%ecx
                    310:        orl     $PSL_AC,%eax
                    311:        pushl   %eax
                    312:        popfl
                    313:        pushfl
                    314:        popl    %eax
                    315:        xorl    %ecx,%eax
                    316:        andl    $PSL_AC,%eax
                    317:        pushl   %ecx
                    318:        popfl
                    319:
                    320:        testl   %eax,%eax
                    321:        jnz     try486
                    322:
                    323:        /*
                    324:         * Try the test of a NexGen CPU -- ZF will not change on a DIV
                    325:         * instruction on a NexGen, it will on an i386.  Documented in
                    326:         * Nx586 Processor Recognition Application Note, NexGen, Inc.
                    327:         */
                    328:        movl    $0x5555,%eax
                    329:        xorl    %edx,%edx
                    330:        movl    $2,%ecx
                    331:        divl    %ecx
                    332:        jnz     is386
                    333:
                    334: isnx586:
                    335:        /*
                    336:         * Don't try cpuid, as Nx586s reportedly don't support the
                    337:         * PSL_ID bit.
                    338:         */
                    339:        movl    $CPU_NX586,RELOC(cpu)
                    340:        jmp     2f
                    341:
                    342: is386:
                    343:        movl    $CPU_386,RELOC(cpu)
                    344:        jmp     2f
                    345:
                    346: try486:        /* Try to toggle identification flag; does not exist on early 486s. */
                    347:        pushfl
                    348:        popl    %eax
                    349:        movl    %eax,%ecx
                    350:        xorl    $PSL_ID,%eax
                    351:        pushl   %eax
                    352:        popfl
                    353:        pushfl
                    354:        popl    %eax
                    355:        xorl    %ecx,%eax
                    356:        andl    $PSL_ID,%eax
                    357:        pushl   %ecx
                    358:        popfl
                    359:
                    360:        testl   %eax,%eax
                    361:        jnz     try586
                    362: is486: movl    $CPU_486,RELOC(cpu)
                    363:        /*
                    364:         * Check Cyrix CPU
                    365:         * Cyrix CPUs do not change the undefined flags following
                    366:         * execution of the divide instruction which divides 5 by 2.
                    367:         *
                    368:         * Note: CPUID is enabled on M2, so it passes another way.
                    369:         */
                    370:        pushfl
                    371:        movl    $0x5555, %eax
                    372:        xorl    %edx, %edx
                    373:        movl    $2, %ecx
                    374:        clc
                    375:        divl    %ecx
                    376:        jnc     trycyrix486
                    377:        popfl
                    378:        jmp 2f
                    379: trycyrix486:
                    380:        movl    $CPU_6x86,RELOC(cpu)    # set CPU type
                    381:        /*
                    382:         * Check for Cyrix 486 CPU by seeing if the flags change during a
                    383:         * divide. This is documented in the Cx486SLC/e SMM Programmer's
                    384:         * Guide.
                    385:         */
                    386:        xorl    %edx,%edx
                    387:        cmpl    %edx,%edx               # set flags to known state
                    388:        pushfl
                    389:        popl    %ecx                    # store flags in ecx
                    390:        movl    $-1,%eax
                    391:        movl    $4,%ebx
                    392:        divl    %ebx                    # do a long division
                    393:        pushfl
                    394:        popl    %eax
                    395:        xorl    %ecx,%eax               # are the flags different?
                    396:        testl   $0x8d5,%eax             # only check C|PF|AF|Z|N|V
                    397:        jne     2f                      # yes; must be Cyrix 6x86 CPU
                    398:        movl    $CPU_486DLC,RELOC(cpu)  # set CPU type
                    399:
                    400: #ifndef CYRIX_CACHE_WORKS
                    401:        /* Disable caching of the ISA hole only. */
                    402:        invd
                    403:        movb    $CCR0,%al               # Configuration Register index (CCR0)
                    404:        outb    %al,$0x22
                    405:        inb     $0x23,%al
                    406:        orb     $(CCR0_NC1|CCR0_BARB),%al
                    407:        movb    %al,%ah
                    408:        movb    $CCR0,%al
                    409:        outb    %al,$0x22
                    410:        movb    %ah,%al
                    411:        outb    %al,$0x23
                    412:        invd
                    413: #else /* CYRIX_CACHE_WORKS */
                    414:        /* Set cache parameters */
                    415:        invd                            # Start with guaranteed clean cache
                    416:        movb    $CCR0,%al               # Configuration Register index (CCR0)
                    417:        outb    %al,$0x22
                    418:        inb     $0x23,%al
                    419:        andb    $~CCR0_NC0,%al
                    420: #ifndef CYRIX_CACHE_REALLY_WORKS
                    421:        orb     $(CCR0_NC1|CCR0_BARB),%al
                    422: #else
                    423:        orb     $CCR0_NC1,%al
                    424: #endif
                    425:        movb    %al,%ah
                    426:        movb    $CCR0,%al
                    427:        outb    %al,$0x22
                    428:        movb    %ah,%al
                    429:        outb    %al,$0x23
                    430:        /* clear non-cacheable region 1 */
                    431:        movb    $(NCR1+2),%al
                    432:        outb    %al,$0x22
                    433:        movb    $NCR_SIZE_0K,%al
                    434:        outb    %al,$0x23
                    435:        /* clear non-cacheable region 2 */
                    436:        movb    $(NCR2+2),%al
                    437:        outb    %al,$0x22
                    438:        movb    $NCR_SIZE_0K,%al
                    439:        outb    %al,$0x23
                    440:        /* clear non-cacheable region 3 */
                    441:        movb    $(NCR3+2),%al
                    442:        outb    %al,$0x22
                    443:        movb    $NCR_SIZE_0K,%al
                    444:        outb    %al,$0x23
                    445:        /* clear non-cacheable region 4 */
                    446:        movb    $(NCR4+2),%al
                    447:        outb    %al,$0x22
                    448:        movb    $NCR_SIZE_0K,%al
                    449:        outb    %al,$0x23
                    450:        /* enable caching in CR0 */
                    451:        movl    %cr0,%eax
                    452:        andl    $~(CR0_CD|CR0_NW),%eax
                    453:        movl    %eax,%cr0
                    454:        invd
                    455: #endif /* CYRIX_CACHE_WORKS */
                    456:
                    457:        jmp     2f
                    458:
                    459: try586:        /* Use the `cpuid' instruction. */
                    460:        xorl    %eax,%eax
                    461:        cpuid
                    462:        movl    %eax,RELOC(cpu_info_primary)+CPU_INFO_LEVEL
                    463:
                    464: 2:
                    465:        /*
                    466:         * Finished with old stack; load new %esp now instead of later so we
                    467:         * can trace this code without having to worry about the trace trap
                    468:         * clobbering the memory test or the zeroing of the bss+bootstrap page
                    469:         * tables.
                    470:         *
                    471:         * The boot program should check:
                    472:         *      text+data <= &stack_variable - more_space_for_stack
                    473:         *      text+data+bss+pad+space_for_page_tables <= end_of_memory
                    474:         * Oops, the gdt is in the carcass of the boot program so clearing
                    475:         * the rest of memory is still not possible.
                    476:         */
                    477:        movl    $_RELOC(tmpstk),%esp    # bootstrap stack end location
                    478:
                    479: /*
                    480:  * Virtual address space of kernel:
                    481:  *
1.30      junyoung  482:  * text | data | bss | [syms] | page dir | proc0 kstack
1.1       fvdl      483:  *                           0          1       2      3
                    484:  */
1.7       thorpej   485: #define        PROC0PDIR       ((0)              * PAGE_SIZE)
                    486: #define        PROC0STACK      ((1)              * PAGE_SIZE)
                    487: #define        SYSMAP          ((1+UPAGES)       * PAGE_SIZE)
                    488: #define        TABLESIZE       ((1+UPAGES) * PAGE_SIZE) /* + nkpde * PAGE_SIZE */
1.1       fvdl      489:
                    490:        /* Find end of kernel image. */
                    491:        movl    $RELOC(end),%edi
1.8       fvdl      492: #if (NKSYMS || defined(DDB) || defined(LKM)) && !defined(SYMTAB_SPACE)
1.1       fvdl      493:        /* Save the symbols (if loaded). */
                    494:        movl    RELOC(esym),%eax
                    495:        testl   %eax,%eax
                    496:        jz      1f
1.13      christos  497:        subl    $KERNBASE_LOCORE,%eax
1.1       fvdl      498:        movl    %eax,%edi
                    499: 1:
                    500: #endif
                    501:
                    502:        /* Calculate where to start the bootstrap tables. */
                    503:        movl    %edi,%esi                       # edi = esym ? esym : end
                    504:        addl    $PGOFSET,%esi                   # page align up
                    505:        andl    $~PGOFSET,%esi
                    506:
                    507:        /*
                    508:         * Calculate the size of the kernel page table directory, and
1.29      mycroft   509:         * how many entries it will have.  Adjust nkpde to the actual
                    510:         * kernel size automatically.  Account for the bootstrap tables,
                    511:         * round up, and add an extra 4MB.
1.1       fvdl      512:         */
1.29      mycroft   513:        leal    TABLESIZE+NBPD+PDOFSET(%edi),%eax
                    514:        shrl    $PDSHIFT,%eax
1.1       fvdl      515:        movl    RELOC(nkpde),%ecx               # get nkpde
1.29      mycroft   516:        cmpl    %ecx,%eax
                    517:        jb      1f
                    518:        movl    %eax,%ecx
                    519: 1:     cmpl    $NKPTP_MIN,%ecx                 # larger than min?
1.1       fvdl      520:        jge     1f
                    521:        movl    $NKPTP_MIN,%ecx                 # set at min
                    522:        jmp     2f
                    523: 1:     cmpl    $NKPTP_MAX,%ecx                 # larger than max?
                    524:        jle     2f
                    525:        movl    $NKPTP_MAX,%ecx
1.29      mycroft   526: 2:     movl    %ecx,RELOC(nkpde)
1.1       fvdl      527:
                    528:        /* Clear memory for bootstrap tables. */
                    529:        shll    $PGSHIFT,%ecx
                    530:        addl    $TABLESIZE,%ecx
                    531:        addl    %esi,%ecx                       # end of tables
                    532:        subl    %edi,%ecx                       # size of tables
                    533:        shrl    $2,%ecx
                    534:        xorl    %eax,%eax
                    535:        cld
                    536:        rep
                    537:        stosl
                    538:
                    539: /*
                    540:  * fillkpt
                    541:  *     eax = pte (page frame | control | status)
                    542:  *     ebx = page table address
                    543:  *     ecx = number of pages to map
                    544:  */
                    545: #define        fillkpt         \
                    546: 1:     movl    %eax,(%ebx)     ; \
1.7       thorpej   547:        addl    $PAGE_SIZE,%eax ; /* increment physical address */ \
1.1       fvdl      548:        addl    $4,%ebx         ; /* next pte */ \
                    549:        loop    1b              ;
                    550:
                    551: /*
                    552:  * Build initial page tables.
                    553:  */
                    554:        /* Calculate end of text segment, rounded to a page. */
                    555:        leal    (RELOC(etext)+PGOFSET),%edx
                    556:        andl    $~PGOFSET,%edx
1.30      junyoung  557:
1.1       fvdl      558:        /* Skip over the first 1MB. */
                    559:        movl    $_RELOC(KERNTEXTOFF),%eax
                    560:        movl    %eax,%ecx
                    561:        shrl    $PGSHIFT,%ecx
                    562:        leal    (SYSMAP)(%esi,%ecx,4),%ebx
                    563:
                    564:        /* Map the kernel text read-only. */
                    565:        movl    %edx,%ecx
                    566:        subl    %eax,%ecx
                    567:        shrl    $PGSHIFT,%ecx
                    568:        orl     $(PG_V|PG_KR),%eax
                    569:        fillkpt
                    570:
                    571:        /* Map the data, BSS, and bootstrap tables read-write. */
                    572:        leal    (PG_V|PG_KW)(%edx),%eax
                    573:        movl    RELOC(nkpde),%ecx
                    574:        shll    $PGSHIFT,%ecx
                    575:        addl    $TABLESIZE,%ecx
                    576:        addl    %esi,%ecx                               # end of tables
                    577:        subl    %edx,%ecx                               # subtract end of text
                    578:        shrl    $PGSHIFT,%ecx
                    579:        fillkpt
                    580:
                    581:        /* Map ISA I/O memory. */
                    582:        movl    $(IOM_BEGIN|PG_V|PG_KW/*|PG_N*/),%eax   # having these bits set
                    583:        movl    $(IOM_SIZE>>PGSHIFT),%ecx               # for this many pte s,
                    584:        fillkpt
                    585:
                    586: /*
                    587:  * Construct a page table directory.
                    588:  */
                    589:        /* Install PDEs for temporary double map of kernel. */
                    590:        movl    RELOC(nkpde),%ecx                       # for this many pde s,
                    591:        leal    (PROC0PDIR+0*4)(%esi),%ebx              # which is where temp maps!
                    592:        leal    (SYSMAP+PG_V|PG_KW)(%esi),%eax          # pte for KPT in proc 0,
                    593:        fillkpt
                    594:
                    595:        /* Map kernel PDEs. */
                    596:        movl    RELOC(nkpde),%ecx                       # for this many pde s,
                    597:        leal    (PROC0PDIR+PDSLOT_KERN*4)(%esi),%ebx    # kernel pde offset
                    598:        leal    (SYSMAP+PG_V|PG_KW)(%esi),%eax          # pte for KPT in proc 0,
                    599:        fillkpt
                    600:
                    601:        /* Install a PDE recursively mapping page directory as a page table! */
                    602:        leal    (PROC0PDIR+PG_V|PG_KW)(%esi),%eax       # pte for ptd
                    603:        movl    %eax,(PROC0PDIR+PDSLOT_PTE*4)(%esi)     # recursive PD slot
                    604:
1.31      junyoung  605:        /* Save phys. addr of PDP, for libkvm. */
                    606:        movl    %esi,RELOC(PDPpaddr)
1.1       fvdl      607:
                    608:        /* Load base of page directory and enable mapping. */
                    609:        movl    %esi,%eax               # phys address of ptd in proc 0
                    610:        movl    %eax,%cr3               # load ptd addr into mmu
                    611:        movl    %cr0,%eax               # get control word
                    612:                                        # enable paging & NPX emulation
                    613:        orl     $(CR0_PE|CR0_PG|CR0_NE|CR0_TS|CR0_EM|CR0_MP),%eax
                    614:        movl    %eax,%cr0               # and let's page NOW!
                    615:
                    616:        pushl   $begin                  # jump to high mem
                    617:        ret
                    618:
                    619: begin:
1.13      christos  620:        /* Now running relocated at KERNBASE_LOCORE.  Remove double mapping. */
1.1       fvdl      621:        movl    _C_LABEL(nkpde),%ecx            # for this many pde s,
                    622:        leal    (PROC0PDIR+0*4)(%esi),%ebx      # which is where temp maps!
1.13      christos  623:        addl    $(KERNBASE_LOCORE), %ebx        # now use relocated address
1.1       fvdl      624: 1:     movl    $0,(%ebx)
                    625:        addl    $4,%ebx # next pde
                    626:        loop    1b
                    627:
                    628:        /* Relocate atdevbase. */
                    629:        movl    _C_LABEL(nkpde),%edx
                    630:        shll    $PGSHIFT,%edx
1.13      christos  631:        addl    $(TABLESIZE+KERNBASE_LOCORE),%edx
1.1       fvdl      632:        addl    %esi,%edx
                    633:        movl    %edx,_C_LABEL(atdevbase)
                    634:
                    635:        /* Set up bootstrap stack. */
1.13      christos  636:        leal    (PROC0STACK+KERNBASE_LOCORE)(%esi),%eax
1.1       fvdl      637:        movl    %eax,_C_LABEL(proc0paddr)
                    638:        leal    (USPACE-FRAMESIZE)(%eax),%esp
                    639:        movl    %esi,PCB_CR3(%eax)      # pcb->pcb_cr3
                    640:        xorl    %ebp,%ebp               # mark end of frames
                    641:
                    642:        subl    $NGDT*8, %esp           # space for temporary gdt
                    643:        pushl   %esp
                    644:        call    _C_LABEL(initgdt)
                    645:        addl    $4,%esp
1.30      junyoung  646:
1.1       fvdl      647:        movl    _C_LABEL(nkpde),%eax
                    648:        shll    $PGSHIFT,%eax
                    649:        addl    $TABLESIZE,%eax
                    650:        addl    %esi,%eax               # skip past stack and page tables
                    651:
                    652:        pushl   %eax
                    653:        call    _C_LABEL(init386)       # wire 386 chip for unix operation
                    654:        addl    $4+NGDT*8,%esp          # pop temporary gdt
                    655:
                    656: #ifdef SAFARI_FIFO_HACK
                    657:        movb    $5,%al
                    658:        movw    $0x37b,%dx
                    659:        outb    %al,%dx
                    660:        movw    $0x37f,%dx
                    661:        inb     %dx,%al
                    662:        movb    %al,%cl
                    663:
                    664:        orb     $1,%cl
                    665:
                    666:        movb    $5,%al
                    667:        movw    $0x37b,%dx
                    668:        outb    %al,%dx
                    669:        movw    $0x37f,%dx
                    670:        movb    %cl,%al
                    671:        outb    %al,%dx
                    672: #endif /* SAFARI_FIFO_HACK */
                    673:
                    674:        call    _C_LABEL(main)
                    675:
                    676: /*
                    677:  * void proc_trampoline(void);
                    678:  * This is a trampoline function pushed onto the stack of a newly created
                    679:  * process in order to do some additional setup.  The trampoline is entered by
                    680:  * cpu_switch()ing to the process, so we abuse the callee-saved registers used
                    681:  * by cpu_switch() to store the information about the stub to call.
                    682:  * NOTE: This function does not have a normal calling sequence!
                    683:  */
                    684: /* LINTSTUB: Func: void proc_trampoline(void) */
                    685: NENTRY(proc_trampoline)
                    686: #ifdef MULTIPROCESSOR
                    687:        call    _C_LABEL(proc_trampoline_mp)
                    688: #endif
                    689:        movl    $IPL_NONE,CPUVAR(ILEVEL)
                    690:        pushl   %ebx
                    691:        call    *%esi
                    692:        addl    $4,%esp
1.24      yamt      693:        DO_DEFERRED_SWITCH(%eax)
1.1       fvdl      694:        INTRFASTEXIT
                    695:        /* NOTREACHED */
                    696:
                    697: /*****************************************************************************/
1.16      christos  698: #ifdef COMPAT_16
1.1       fvdl      699: /*
                    700:  * Signal trampoline; copied to top of user stack.
                    701:  */
                    702: /* LINTSTUB: Var: char sigcode[1], esigcode[1]; */
                    703: NENTRY(sigcode)
                    704:        /*
                    705:         * Handler has returned here as if we called it.  The sigcontext
                    706:         * is on the stack after the 3 args "we" pushed.
                    707:         */
                    708:        leal    12(%esp),%eax           # get pointer to sigcontext
                    709:        movl    %eax,4(%esp)            # put it in the argument slot
                    710:                                        # fake return address already there
1.17      christos  711:        movl    $SYS_compat_16___sigreturn14,%eax
1.1       fvdl      712:        int     $0x80                   # enter kernel with args on stack
                    713:        movl    $SYS_exit,%eax
                    714:        int     $0x80                   # exit if sigreturn fails
                    715:        .globl  _C_LABEL(esigcode)
                    716: _C_LABEL(esigcode):
1.16      christos  717: #endif
1.1       fvdl      718:
                    719: /*****************************************************************************/
                    720:
                    721: /*
                    722:  * The following primitives are used to fill and copy regions of memory.
                    723:  */
                    724:
                    725: /*
                    726:  * XXX No section 9 man page for fillw.
                    727:  * fillw seems to be very sparsely used (only in pccons it seems.)
                    728:  * One wonders if it couldn't be done without.
                    729:  * -- Perry Metzger, May 7, 2001
                    730:  */
                    731: /*
                    732:  * void fillw(short pattern, void *addr, size_t len);
                    733:  * Write len copies of pattern at addr.
                    734:  */
                    735: /* LINTSTUB: Func: void fillw(short pattern, void *addr, size_t len) */
                    736: ENTRY(fillw)
                    737:        pushl   %edi
                    738:        movl    8(%esp),%eax
                    739:        movl    12(%esp),%edi
                    740:        movw    %ax,%cx
                    741:        rorl    $16,%eax
                    742:        movw    %cx,%ax
                    743:        cld
                    744:        movl    16(%esp),%ecx
                    745:        shrl    %ecx                    # do longwords
                    746:        rep
                    747:        stosl
                    748:        movl    16(%esp),%ecx
                    749:        andl    $1,%ecx                 # do remainder
                    750:        rep
                    751:        stosw
                    752:        popl    %edi
                    753:        ret
                    754:
                    755: /*
                    756:  * int kcopy(const void *from, void *to, size_t len);
                    757:  * Copy len bytes, abort on fault.
                    758:  */
                    759: /* LINTSTUB: Func: int kcopy(const void *from, void *to, size_t len) */
                    760: ENTRY(kcopy)
                    761:        pushl   %esi
                    762:        pushl   %edi
                    763:        GET_CURPCB(%eax)                # load curpcb into eax and set on-fault
                    764:        pushl   PCB_ONFAULT(%eax)
1.24      yamt      765:        movl    $_C_LABEL(kcopy_fault), PCB_ONFAULT(%eax)
1.1       fvdl      766:
                    767:        movl    16(%esp),%esi
                    768:        movl    20(%esp),%edi
                    769:        movl    24(%esp),%ecx
                    770:        movl    %edi,%eax
                    771:        subl    %esi,%eax
                    772:        cmpl    %ecx,%eax               # overlapping?
                    773:        jb      1f
                    774:        cld                             # nope, copy forward
                    775:        shrl    $2,%ecx                 # copy by 32-bit words
                    776:        rep
                    777:        movsl
                    778:        movl    24(%esp),%ecx
                    779:        andl    $3,%ecx                 # any bytes left?
                    780:        rep
                    781:        movsb
                    782:
                    783:        GET_CURPCB(%edx)                # XXX save curpcb?
                    784:        popl    PCB_ONFAULT(%edx)
                    785:        popl    %edi
                    786:        popl    %esi
                    787:        xorl    %eax,%eax
                    788:        ret
                    789:
                    790:        ALIGN_TEXT
                    791: 1:     addl    %ecx,%edi               # copy backward
                    792:        addl    %ecx,%esi
                    793:        std
                    794:        andl    $3,%ecx                 # any fractional bytes?
                    795:        decl    %edi
                    796:        decl    %esi
                    797:        rep
                    798:        movsb
                    799:        movl    24(%esp),%ecx           # copy remainder by 32-bit words
                    800:        shrl    $2,%ecx
                    801:        subl    $3,%esi
                    802:        subl    $3,%edi
                    803:        rep
                    804:        movsl
                    805:        cld
                    806:
                    807:        GET_CURPCB(%edx)
                    808:        popl    PCB_ONFAULT(%edx)
                    809:        popl    %edi
                    810:        popl    %esi
                    811:        xorl    %eax,%eax
                    812:        ret
                    813:
                    814: /*****************************************************************************/
                    815:
                    816: /*
                    817:  * The following primitives are used to copy data in and out of the user's
                    818:  * address space.
                    819:  */
                    820:
                    821: /*
                    822:  * Default to the lowest-common-denominator.  We will improve it
                    823:  * later.
                    824:  */
                    825: #if defined(I386_CPU)
                    826: #define        DEFAULT_COPYOUT         _C_LABEL(i386_copyout)
                    827: #define        DEFAULT_COPYIN          _C_LABEL(i386_copyin)
                    828: #elif defined(I486_CPU)
                    829: #define        DEFAULT_COPYOUT         _C_LABEL(i486_copyout)
                    830: #define        DEFAULT_COPYIN          _C_LABEL(i386_copyin)
                    831: #elif defined(I586_CPU)
                    832: #define        DEFAULT_COPYOUT         _C_LABEL(i486_copyout)  /* XXX */
                    833: #define        DEFAULT_COPYIN          _C_LABEL(i386_copyin)   /* XXX */
                    834: #elif defined(I686_CPU)
                    835: #define        DEFAULT_COPYOUT         _C_LABEL(i486_copyout)  /* XXX */
                    836: #define        DEFAULT_COPYIN          _C_LABEL(i386_copyin)   /* XXX */
                    837: #endif
                    838:
                    839:        .data
                    840:
                    841:        .globl  _C_LABEL(copyout_func)
                    842: _C_LABEL(copyout_func):
                    843:        .long   DEFAULT_COPYOUT
                    844:
                    845:        .globl  _C_LABEL(copyin_func)
                    846: _C_LABEL(copyin_func):
                    847:        .long   DEFAULT_COPYIN
                    848:
                    849:        .text
                    850:
                    851: /*
                    852:  * int copyout(const void *from, void *to, size_t len);
                    853:  * Copy len bytes into the user's address space.
                    854:  * see copyout(9)
                    855:  */
                    856: /* LINTSTUB: Func: int copyout(const void *kaddr, void *uaddr, size_t len) */
                    857: ENTRY(copyout)
1.24      yamt      858:        DO_DEFERRED_SWITCH(%eax)
1.1       fvdl      859:        jmp     *_C_LABEL(copyout_func)
                    860:
                    861: #if defined(I386_CPU)
                    862: /* LINTSTUB: Func: int i386_copyout(const void *kaddr, void *uaddr, size_t len) */
                    863: ENTRY(i386_copyout)
                    864:        pushl   %esi
                    865:        pushl   %edi
                    866:        pushl   $0
1.30      junyoung  867:
1.1       fvdl      868:        movl    16(%esp),%esi
                    869:        movl    20(%esp),%edi
                    870:        movl    24(%esp),%eax
                    871:
                    872:        /*
                    873:         * We check that the end of the destination buffer is not past the end
                    874:         * of the user's address space.  If it's not, then we only need to
                    875:         * check that each page is writable.  The 486 will do this for us; the
                    876:         * 386 will not.  (We assume that pages in user space that are not
                    877:         * writable by the user are not writable by the kernel either.)
                    878:         */
                    879:        movl    %edi,%edx
                    880:        addl    %eax,%edx
                    881:        jc      _C_LABEL(copy_efault)
                    882:        cmpl    $VM_MAXUSER_ADDRESS,%edx
                    883:        ja      _C_LABEL(copy_efault)
                    884:
                    885:        testl   %eax,%eax               # anything to do?
                    886:        jz      3f
                    887:
                    888:        /*
                    889:         * We have to check each PTE for (write) permission, since the CPU
                    890:         * doesn't do it for us.
                    891:         */
                    892:
                    893:        /* Compute number of pages. */
                    894:        movl    %edi,%ecx
                    895:        andl    $PGOFSET,%ecx
                    896:        addl    %eax,%ecx
                    897:        decl    %ecx
                    898:        shrl    $PGSHIFT,%ecx
                    899:
                    900:        /* Compute PTE offset for start address. */
                    901:        shrl    $PGSHIFT,%edi
                    902:
                    903:        GET_CURPCB(%edx)
                    904:        movl    $2f,PCB_ONFAULT(%edx)
                    905:
                    906: 1:     /* Check PTE for each page. */
1.31      junyoung  907:        testb   $PG_RW,PTE_BASE(,%edi,4)
1.1       fvdl      908:        jz      2f
1.30      junyoung  909:
1.1       fvdl      910: 4:     incl    %edi
                    911:        decl    %ecx
                    912:        jns     1b
                    913:
                    914:        movl    20(%esp),%edi
                    915:        movl    24(%esp),%eax
                    916:        jmp     3f
1.30      junyoung  917:
1.1       fvdl      918: 2:     /* Simulate a trap. */
                    919:        pushl   %ecx
                    920:        movl    %edi,%eax
                    921:        shll    $PGSHIFT,%eax
                    922:        pushl   %eax
                    923:        call    _C_LABEL(trapwrite)     # trapwrite(addr)
                    924:        addl    $4,%esp                 # pop argument
                    925:        popl    %ecx
                    926:        testl   %eax,%eax               # if not ok, return EFAULT
                    927:        jz      4b
                    928:        jmp     _C_LABEL(copy_efault)
                    929:
                    930: 3:     GET_CURPCB(%edx)
                    931:        movl    $_C_LABEL(copy_fault),PCB_ONFAULT(%edx)
                    932:
                    933:        /* bcopy(%esi, %edi, %eax); */
                    934:        cld
                    935:        movl    %eax,%ecx
                    936:        shrl    $2,%ecx
                    937:        rep
                    938:        movsl
                    939:        movl    %eax,%ecx
                    940:        andl    $3,%ecx
                    941:        rep
                    942:        movsb
                    943:
                    944:        popl    PCB_ONFAULT(%edx)
                    945:        popl    %edi
                    946:        popl    %esi
                    947:        xorl    %eax,%eax
                    948:        ret
                    949: #endif /* I386_CPU */
                    950:
                    951: #if defined(I486_CPU) || defined(I586_CPU) || defined(I686_CPU)
                    952: /* LINTSTUB: Func: int i486_copyout(const void *kaddr, void *uaddr, size_t len) */
                    953: ENTRY(i486_copyout)
                    954:        pushl   %esi
                    955:        pushl   %edi
                    956:        pushl   $0
1.30      junyoung  957:
1.1       fvdl      958:        movl    16(%esp),%esi
                    959:        movl    20(%esp),%edi
                    960:        movl    24(%esp),%eax
                    961:
                    962:        /*
                    963:         * We check that the end of the destination buffer is not past the end
                    964:         * of the user's address space.
                    965:         */
                    966:        movl    %edi,%edx
                    967:        addl    %eax,%edx
                    968:        jc      _C_LABEL(copy_efault)
                    969:        cmpl    $VM_MAXUSER_ADDRESS,%edx
                    970:        ja      _C_LABEL(copy_efault)
                    971:
                    972:        GET_CURPCB(%edx)
                    973:        movl    $_C_LABEL(copy_fault),PCB_ONFAULT(%edx)
                    974:
                    975:        /* bcopy(%esi, %edi, %eax); */
                    976:        cld
                    977:        movl    %eax,%ecx
                    978:        shrl    $2,%ecx
                    979:        rep
                    980:        movsl
                    981:        movl    %eax,%ecx
                    982:        andl    $3,%ecx
                    983:        rep
                    984:        movsb
                    985:
                    986:        popl    PCB_ONFAULT(%edx)
                    987:        popl    %edi
                    988:        popl    %esi
                    989:        xorl    %eax,%eax
                    990:        ret
                    991: #endif /* I486_CPU || I586_CPU || I686_CPU */
                    992:
                    993: /*
                    994:  * int copyin(const void *from, void *to, size_t len);
                    995:  * Copy len bytes from the user's address space.
                    996:  * see copyin(9)
                    997:  */
                    998: /* LINTSTUB: Func: int copyin(const void *uaddr, void *kaddr, size_t len) */
                    999: ENTRY(copyin)
1.24      yamt     1000:        DO_DEFERRED_SWITCH(%eax)
1.1       fvdl     1001:        jmp     *_C_LABEL(copyin_func)
                   1002:
                   1003: #if defined(I386_CPU) || defined(I486_CPU) || defined(I586_CPU) || \
                   1004:     defined(I686_CPU)
                   1005: /* LINTSTUB: Func: int i386_copyin(const void *uaddr, void *kaddr, size_t len) */
                   1006: ENTRY(i386_copyin)
                   1007:        pushl   %esi
                   1008:        pushl   %edi
                   1009:        GET_CURPCB(%eax)
                   1010:        pushl   $0
                   1011:        movl    $_C_LABEL(copy_fault),PCB_ONFAULT(%eax)
1.30      junyoung 1012:
1.1       fvdl     1013:        movl    16(%esp),%esi
                   1014:        movl    20(%esp),%edi
                   1015:        movl    24(%esp),%eax
                   1016:
                   1017:        /*
                   1018:         * We check that the end of the destination buffer is not past the end
                   1019:         * of the user's address space.  If it's not, then we only need to
                   1020:         * check that each page is readable, and the CPU will do that for us.
                   1021:         */
                   1022:        movl    %esi,%edx
                   1023:        addl    %eax,%edx
                   1024:        jc      _C_LABEL(copy_efault)
                   1025:        cmpl    $VM_MAXUSER_ADDRESS,%edx
                   1026:        ja      _C_LABEL(copy_efault)
                   1027:
                   1028:        /* bcopy(%esi, %edi, %eax); */
                   1029:        cld
                   1030:        movl    %eax,%ecx
                   1031:        shrl    $2,%ecx
                   1032:        rep
                   1033:        movsl
                   1034:        movl    %eax,%ecx
                   1035:        andl    $3,%ecx
                   1036:        rep
                   1037:        movsb
                   1038:
                   1039:        GET_CURPCB(%edx)
                   1040:        popl    PCB_ONFAULT(%edx)
                   1041:        popl    %edi
                   1042:        popl    %esi
                   1043:        xorl    %eax,%eax
                   1044:        ret
                   1045: #endif /* I386_CPU || I486_CPU || I586_CPU || I686_CPU */
                   1046:
                   1047: /* LINTSTUB: Ignore */
                   1048: NENTRY(copy_efault)
                   1049:        movl    $EFAULT,%eax
                   1050:
1.24      yamt     1051: /*
                   1052:  * kcopy_fault is used by kcopy and copy_fault is used by copyin/out.
                   1053:  *
                   1054:  * they're distinguished for lazy pmap switching.  see trap().
                   1055:  */
                   1056: /* LINTSTUB: Ignore */
                   1057: NENTRY(kcopy_fault)
                   1058:        GET_CURPCB(%edx)
                   1059:        popl    PCB_ONFAULT(%edx)
                   1060:        popl    %edi
                   1061:        popl    %esi
                   1062:        ret
                   1063:
1.1       fvdl     1064: /* LINTSTUB: Ignore */
                   1065: NENTRY(copy_fault)
                   1066:        GET_CURPCB(%edx)
                   1067:        popl    PCB_ONFAULT(%edx)
                   1068:        popl    %edi
                   1069:        popl    %esi
                   1070:        ret
                   1071:
                   1072: /*
                   1073:  * int copyoutstr(const void *from, void *to, size_t maxlen, size_t *lencopied);
                   1074:  * Copy a NUL-terminated string, at most maxlen characters long, into the
                   1075:  * user's address space.  Return the number of characters copied (including the
                   1076:  * NUL) in *lencopied.  If the string is too long, return ENAMETOOLONG; else
                   1077:  * return 0 or EFAULT.
                   1078:  * see copyoutstr(9)
                   1079:  */
                   1080: /* LINTSTUB: Func: int copyoutstr(const void *kaddr, void *uaddr, size_t len, size_t *done) */
                   1081: ENTRY(copyoutstr)
                   1082:        pushl   %esi
                   1083:        pushl   %edi
                   1084:
1.24      yamt     1085:        DO_DEFERRED_SWITCH(%eax)
                   1086:
1.1       fvdl     1087:        movl    12(%esp),%esi           # esi = from
                   1088:        movl    16(%esp),%edi           # edi = to
                   1089:        movl    20(%esp),%edx           # edx = maxlen
                   1090:
                   1091: #if defined(I386_CPU)
                   1092: #if defined(I486_CPU) || defined(I586_CPU) || defined(I686_CPU)
                   1093:        cmpl    $CPUCLASS_386,_C_LABEL(cpu_class)
                   1094:        jne     5f
                   1095: #endif /* I486_CPU || I586_CPU || I686_CPU */
                   1096:
                   1097:        /* Compute number of bytes in first page. */
                   1098:        movl    %edi,%eax
                   1099:        andl    $PGOFSET,%eax
1.7       thorpej  1100:        movl    $PAGE_SIZE,%ecx
                   1101:        subl    %eax,%ecx               # ecx = PAGE_SIZE - (src % PAGE_SIZE)
1.1       fvdl     1102:
                   1103:        GET_CURPCB(%eax)
                   1104:        movl    $6f,PCB_ONFAULT(%eax)
                   1105:
                   1106: 1:     /*
                   1107:         * Once per page, check that we are still within the bounds of user
                   1108:         * space, and check for a write fault.
                   1109:         */
                   1110:        cmpl    $VM_MAXUSER_ADDRESS,%edi
                   1111:        jae     _C_LABEL(copystr_efault)
                   1112:
                   1113:        /* Compute PTE offset. */
                   1114:        movl    %edi,%eax
                   1115:        shrl    $PGSHIFT,%eax           # calculate pte address
                   1116:
1.31      junyoung 1117:        testb   $PG_RW,PTE_BASE(,%eax,4)
1.1       fvdl     1118:        jnz     2f
                   1119:
                   1120: 6:     /* Simulate a trap. */
                   1121:        pushl   %edx
                   1122:        pushl   %edi
                   1123:        call    _C_LABEL(trapwrite)     # trapwrite(addr)
                   1124:        addl    $4,%esp                 # clear argument from stack
                   1125:        popl    %edx
                   1126:        testl   %eax,%eax
                   1127:        jnz     _C_LABEL(copystr_efault)
                   1128:
                   1129: 2:     /* Copy up to end of this page. */
                   1130:        subl    %ecx,%edx               # predecrement total count
                   1131:        jnc     3f
                   1132:        addl    %edx,%ecx               # ecx += (edx - ecx) = edx
                   1133:        xorl    %edx,%edx
                   1134:
                   1135: 3:     decl    %ecx
                   1136:        js      4f
                   1137:        lodsb
                   1138:        stosb
                   1139:        testb   %al,%al
                   1140:        jnz     3b
                   1141:
                   1142:        /* Success -- 0 byte reached. */
                   1143:        addl    %ecx,%edx               # add back residual for this page
                   1144:        xorl    %eax,%eax
                   1145:        jmp     copystr_return
                   1146:
                   1147: 4:     /* Go to next page, if any. */
1.7       thorpej  1148:        movl    $PAGE_SIZE,%ecx
1.1       fvdl     1149:        testl   %edx,%edx
                   1150:        jnz     1b
                   1151:
                   1152:        /* edx is zero -- return ENAMETOOLONG. */
                   1153:        movl    $ENAMETOOLONG,%eax
                   1154:        jmp     copystr_return
                   1155: #endif /* I386_CPU */
                   1156:
                   1157: #if defined(I486_CPU) || defined(I586_CPU) || defined(I686_CPU)
                   1158: 5:     GET_CURPCB(%eax)
                   1159:        movl    $_C_LABEL(copystr_fault),PCB_ONFAULT(%eax)
                   1160:        /*
                   1161:         * Get min(%edx, VM_MAXUSER_ADDRESS-%edi).
                   1162:         */
                   1163:        movl    $VM_MAXUSER_ADDRESS,%eax
                   1164:        subl    %edi,%eax
1.31.6.2! yamt     1165:        jc      _C_LABEL(copystr_efault)
1.1       fvdl     1166:        cmpl    %edx,%eax
                   1167:        jae     1f
                   1168:        movl    %eax,%edx
                   1169:        movl    %eax,20(%esp)
                   1170:
                   1171: 1:     incl    %edx
                   1172:        cld
                   1173:
                   1174: 1:     decl    %edx
                   1175:        jz      2f
                   1176:        lodsb
                   1177:        stosb
                   1178:        testb   %al,%al
                   1179:        jnz     1b
                   1180:
                   1181:        /* Success -- 0 byte reached. */
                   1182:        decl    %edx
                   1183:        xorl    %eax,%eax
                   1184:        jmp     copystr_return
                   1185:
                   1186: 2:     /* edx is zero -- return EFAULT or ENAMETOOLONG. */
                   1187:        cmpl    $VM_MAXUSER_ADDRESS,%edi
                   1188:        jae     _C_LABEL(copystr_efault)
                   1189:        movl    $ENAMETOOLONG,%eax
                   1190:        jmp     copystr_return
                   1191: #endif /* I486_CPU || I586_CPU || I686_CPU */
                   1192:
                   1193: /*
                   1194:  * int copyinstr(const void *from, void *to, size_t maxlen, size_t *lencopied);
                   1195:  * Copy a NUL-terminated string, at most maxlen characters long, from the
                   1196:  * user's address space.  Return the number of characters copied (including the
                   1197:  * NUL) in *lencopied.  If the string is too long, return ENAMETOOLONG; else
                   1198:  * return 0 or EFAULT.
                   1199:  * see copyinstr(9)
                   1200:  */
                   1201: /* LINTSTUB: Func: int copyinstr(const void *uaddr, void *kaddr, size_t len, size_t *done) */
                   1202: ENTRY(copyinstr)
                   1203:        pushl   %esi
                   1204:        pushl   %edi
1.30      junyoung 1205:
1.24      yamt     1206:        DO_DEFERRED_SWITCH(%eax)
                   1207:
1.1       fvdl     1208:        GET_CURPCB(%ecx)
                   1209:        movl    $_C_LABEL(copystr_fault),PCB_ONFAULT(%ecx)
                   1210:
                   1211:        movl    12(%esp),%esi           # %esi = from
                   1212:        movl    16(%esp),%edi           # %edi = to
                   1213:        movl    20(%esp),%edx           # %edx = maxlen
                   1214:
                   1215:        /*
                   1216:         * Get min(%edx, VM_MAXUSER_ADDRESS-%esi).
                   1217:         */
                   1218:        movl    $VM_MAXUSER_ADDRESS,%eax
                   1219:        subl    %esi,%eax
1.31.6.2! yamt     1220:        jc      _C_LABEL(copystr_efault)
1.1       fvdl     1221:        cmpl    %edx,%eax
                   1222:        jae     1f
                   1223:        movl    %eax,%edx
                   1224:        movl    %eax,20(%esp)
                   1225:
                   1226: 1:     incl    %edx
                   1227:        cld
                   1228:
                   1229: 1:     decl    %edx
                   1230:        jz      2f
                   1231:        lodsb
                   1232:        stosb
                   1233:        testb   %al,%al
                   1234:        jnz     1b
                   1235:
                   1236:        /* Success -- 0 byte reached. */
                   1237:        decl    %edx
                   1238:        xorl    %eax,%eax
                   1239:        jmp     copystr_return
                   1240:
                   1241: 2:     /* edx is zero -- return EFAULT or ENAMETOOLONG. */
                   1242:        cmpl    $VM_MAXUSER_ADDRESS,%esi
                   1243:        jae     _C_LABEL(copystr_efault)
                   1244:        movl    $ENAMETOOLONG,%eax
                   1245:        jmp     copystr_return
                   1246:
                   1247: /* LINTSTUB: Ignore */
                   1248: NENTRY(copystr_efault)
                   1249:        movl    $EFAULT,%eax
                   1250:
                   1251: /* LINTSTUB: Ignore */
                   1252: NENTRY(copystr_fault)
                   1253: copystr_return:
                   1254:        /* Set *lencopied and return %eax. */
                   1255:        GET_CURPCB(%ecx)
                   1256:        movl    $0,PCB_ONFAULT(%ecx)
                   1257:        movl    20(%esp),%ecx
                   1258:        subl    %edx,%ecx
                   1259:        movl    24(%esp),%edx
                   1260:        testl   %edx,%edx
                   1261:        jz      8f
                   1262:        movl    %ecx,(%edx)
                   1263:
                   1264: 8:     popl    %edi
                   1265:        popl    %esi
                   1266:        ret
                   1267:
                   1268: /*
                   1269:  * int copystr(const void *from, void *to, size_t maxlen, size_t *lencopied);
                   1270:  * Copy a NUL-terminated string, at most maxlen characters long.  Return the
                   1271:  * number of characters copied (including the NUL) in *lencopied.  If the
                   1272:  * string is too long, return ENAMETOOLONG; else return 0.
                   1273:  * see copystr(9)
                   1274:  */
                   1275: /* LINTSTUB: Func: int copystr(const void *kfaddr, void *kdaddr, size_t len, size_t *done) */
                   1276: ENTRY(copystr)
                   1277:        pushl   %esi
                   1278:        pushl   %edi
                   1279:
                   1280:        movl    12(%esp),%esi           # esi = from
                   1281:        movl    16(%esp),%edi           # edi = to
                   1282:        movl    20(%esp),%edx           # edx = maxlen
                   1283:        incl    %edx
                   1284:        cld
                   1285:
                   1286: 1:     decl    %edx
                   1287:        jz      4f
                   1288:        lodsb
                   1289:        stosb
                   1290:        testb   %al,%al
                   1291:        jnz     1b
                   1292:
                   1293:        /* Success -- 0 byte reached. */
                   1294:        decl    %edx
                   1295:        xorl    %eax,%eax
                   1296:        jmp     6f
                   1297:
                   1298: 4:     /* edx is zero -- return ENAMETOOLONG. */
                   1299:        movl    $ENAMETOOLONG,%eax
                   1300:
                   1301: 6:     /* Set *lencopied and return %eax. */
                   1302:        movl    20(%esp),%ecx
                   1303:        subl    %edx,%ecx
                   1304:        movl    24(%esp),%edx
                   1305:        testl   %edx,%edx
                   1306:        jz      7f
                   1307:        movl    %ecx,(%edx)
                   1308:
                   1309: 7:     popl    %edi
                   1310:        popl    %esi
                   1311:        ret
                   1312:
                   1313: /*
                   1314:  * long fuword(const void *uaddr);
                   1315:  * Fetch an int from the user's address space.
                   1316:  * see fuword(9)
                   1317:  */
                   1318: /* LINTSTUB: Func: long fuword(const void *base) */
                   1319: ENTRY(fuword)
1.24      yamt     1320:        DO_DEFERRED_SWITCH(%eax)
1.1       fvdl     1321:        movl    4(%esp),%edx
                   1322:        cmpl    $VM_MAXUSER_ADDRESS-4,%edx
                   1323:        ja      _C_LABEL(fusuaddrfault)
                   1324:        GET_CURPCB(%ecx)
                   1325:        movl    $_C_LABEL(fusufault),PCB_ONFAULT(%ecx)
                   1326:        movl    (%edx),%eax
                   1327:        movl    $0,PCB_ONFAULT(%ecx)
                   1328:        ret
1.30      junyoung 1329:
1.1       fvdl     1330: /*
                   1331:  * int fusword(const void *uaddr);
                   1332:  * Fetch a short from the user's address space.
                   1333:  * see fusword(9)
                   1334:  */
                   1335: /* LINTSTUB: Func: int fusword(const void *base) */
                   1336: ENTRY(fusword)
1.24      yamt     1337:        DO_DEFERRED_SWITCH(%eax)
1.1       fvdl     1338:        movl    4(%esp),%edx
                   1339:        cmpl    $VM_MAXUSER_ADDRESS-2,%edx
                   1340:        ja      _C_LABEL(fusuaddrfault)
                   1341:        GET_CURPCB(%ecx)
                   1342:        movl    $_C_LABEL(fusufault),PCB_ONFAULT(%ecx)
                   1343:        movzwl  (%edx),%eax
                   1344:        movl    $0,PCB_ONFAULT(%ecx)
                   1345:        ret
1.30      junyoung 1346:
1.1       fvdl     1347: /*
                   1348:  * int fuswintr(const void *uaddr);
                   1349:  * Fetch a short from the user's address space.  Can be called during an
                   1350:  * interrupt.
                   1351:  * see fuswintr(9)
                   1352:  */
                   1353: /* LINTSTUB: Func: int fuswintr(const void *base) */
                   1354: ENTRY(fuswintr)
1.24      yamt     1355:        cmpl    $TLBSTATE_VALID, CPUVAR(TLBSTATE)
                   1356:        jnz     _C_LABEL(fusuaddrfault)
1.1       fvdl     1357:        movl    4(%esp),%edx
                   1358:        cmpl    $VM_MAXUSER_ADDRESS-2,%edx
                   1359:        ja      _C_LABEL(fusuaddrfault)
1.5       thorpej  1360:        movl    CPUVAR(CURLWP),%ecx
                   1361:        movl    L_ADDR(%ecx),%ecx
1.1       fvdl     1362:        movl    $_C_LABEL(fusubail),PCB_ONFAULT(%ecx)
                   1363:        movzwl  (%edx),%eax
                   1364:        movl    $0,PCB_ONFAULT(%ecx)
                   1365:        ret
1.30      junyoung 1366:
1.1       fvdl     1367: /*
                   1368:  * int fubyte(const void *uaddr);
                   1369:  * Fetch a byte from the user's address space.
                   1370:  * see fubyte(9)
                   1371:  */
                   1372: /* LINTSTUB: Func: int fubyte(const void *base) */
                   1373: ENTRY(fubyte)
1.24      yamt     1374:        DO_DEFERRED_SWITCH(%eax)
1.1       fvdl     1375:        movl    4(%esp),%edx
                   1376:        cmpl    $VM_MAXUSER_ADDRESS-1,%edx
                   1377:        ja      _C_LABEL(fusuaddrfault)
                   1378:        GET_CURPCB(%ecx)
                   1379:        movl    $_C_LABEL(fusufault),PCB_ONFAULT(%ecx)
                   1380:        movzbl  (%edx),%eax
                   1381:        movl    $0,PCB_ONFAULT(%ecx)
                   1382:        ret
                   1383:
                   1384: /*
                   1385:  * Handle faults from [fs]u*().  Clean up and return -1.
                   1386:  */
                   1387: /* LINTSTUB: Ignore */
                   1388: NENTRY(fusufault)
                   1389:        movl    $0,PCB_ONFAULT(%ecx)
                   1390:        movl    $-1,%eax
                   1391:        ret
                   1392:
                   1393: /*
                   1394:  * Handle faults from [fs]u*().  Clean up and return -1.  This differs from
                   1395:  * fusufault() in that trap() will recognize it and return immediately rather
                   1396:  * than trying to page fault.
                   1397:  */
                   1398: /* LINTSTUB: Ignore */
                   1399: NENTRY(fusubail)
                   1400:        movl    $0,PCB_ONFAULT(%ecx)
                   1401:        movl    $-1,%eax
                   1402:        ret
                   1403:
                   1404: /*
                   1405:  * Handle earlier faults from [fs]u*(), due to our of range addresses.
                   1406:  */
                   1407: /* LINTSTUB: Ignore */
                   1408: NENTRY(fusuaddrfault)
                   1409:        movl    $-1,%eax
                   1410:        ret
                   1411:
                   1412: /*
                   1413:  * int suword(void *uaddr, long x);
                   1414:  * Store an int in the user's address space.
                   1415:  * see suword(9)
                   1416:  */
                   1417: /* LINTSTUB: Func: int suword(void *base, long c) */
                   1418: ENTRY(suword)
1.24      yamt     1419:        DO_DEFERRED_SWITCH(%eax)
1.1       fvdl     1420:        movl    4(%esp),%edx
                   1421:        cmpl    $VM_MAXUSER_ADDRESS-4,%edx
                   1422:        ja      _C_LABEL(fusuaddrfault)
                   1423:
                   1424: #if defined(I386_CPU)
                   1425: #if defined(I486_CPU) || defined(I586_CPU) || defined(I686_CPU)
                   1426:        cmpl    $CPUCLASS_386,_C_LABEL(cpu_class)
                   1427:        jne     2f
                   1428: #endif /* I486_CPU || I586_CPU || I686_CPU */
                   1429:
                   1430:        GET_CURPCB(%eax)
                   1431:        movl    $3f,PCB_ONFAULT(%eax)
                   1432:
                   1433:        movl    %edx,%eax
                   1434:        shrl    $PGSHIFT,%eax           # calculate pte address
1.31      junyoung 1435:        testb   $PG_RW,PTE_BASE(,%eax,4)
1.1       fvdl     1436:        jnz     1f
                   1437:
                   1438: 3:     /* Simulate a trap. */
                   1439:        pushl   %edx
                   1440:        pushl   %edx
                   1441:        call    _C_LABEL(trapwrite)     # trapwrite(addr)
                   1442:        addl    $4,%esp                 # clear parameter from the stack
                   1443:        popl    %edx
                   1444:        GET_CURPCB(%ecx)
                   1445:        testl   %eax,%eax
                   1446:        jnz     _C_LABEL(fusufault)
                   1447:
                   1448: 1:     /* XXX also need to check the following 3 bytes for validity! */
                   1449: #endif
                   1450:
                   1451: 2:     GET_CURPCB(%ecx)
                   1452:        movl    $_C_LABEL(fusufault),PCB_ONFAULT(%ecx)
                   1453:
                   1454:        movl    8(%esp),%eax
                   1455:        movl    %eax,(%edx)
                   1456:        xorl    %eax,%eax
                   1457:        movl    %eax,PCB_ONFAULT(%ecx)
                   1458:        ret
1.30      junyoung 1459:
1.1       fvdl     1460: /*
                   1461:  * int susword(void *uaddr, short x);
                   1462:  * Store a short in the user's address space.
                   1463:  * see susword(9)
                   1464:  */
                   1465: /* LINTSTUB: Func: int susword(void *base, short c) */
                   1466: ENTRY(susword)
1.24      yamt     1467:        DO_DEFERRED_SWITCH(%eax)
1.1       fvdl     1468:        movl    4(%esp),%edx
                   1469:        cmpl    $VM_MAXUSER_ADDRESS-2,%edx
                   1470:        ja      _C_LABEL(fusuaddrfault)
                   1471:
                   1472: #if defined(I386_CPU)
                   1473: #if defined(I486_CPU) || defined(I586_CPU) || defined(I686_CPU)
                   1474:        cmpl    $CPUCLASS_386,_C_LABEL(cpu_class)
                   1475:        jne     2f
                   1476: #endif /* I486_CPU || I586_CPU || I686_CPU */
                   1477:
                   1478:        GET_CURPCB(%eax)
                   1479:        movl    $3f,PCB_ONFAULT(%eax)
                   1480:
                   1481:        movl    %edx,%eax
                   1482:        shrl    $PGSHIFT,%eax           # calculate pte address
1.31      junyoung 1483:        testb   $PG_RW,PTE_BASE(,%eax,4)
1.1       fvdl     1484:        jnz     1f
                   1485:
                   1486: 3:     /* Simulate a trap. */
                   1487:        pushl   %edx
                   1488:        pushl   %edx
                   1489:        call    _C_LABEL(trapwrite)     # trapwrite(addr)
                   1490:        addl    $4,%esp                 # clear parameter from the stack
                   1491:        popl    %edx
                   1492:        GET_CURPCB(%ecx)
                   1493:        testl   %eax,%eax
                   1494:        jnz     _C_LABEL(fusufault)
                   1495:
                   1496: 1:     /* XXX also need to check the following byte for validity! */
                   1497: #endif
                   1498:
                   1499: 2:     GET_CURPCB(%ecx)
                   1500:        movl    $_C_LABEL(fusufault),PCB_ONFAULT(%ecx)
                   1501:
                   1502:        movl    8(%esp),%eax
                   1503:        movw    %ax,(%edx)
                   1504:        xorl    %eax,%eax
                   1505:        movl    %eax,PCB_ONFAULT(%ecx)
                   1506:        ret
                   1507:
                   1508: /*
                   1509:  * int suswintr(void *uaddr, short x);
                   1510:  * Store a short in the user's address space.  Can be called during an
                   1511:  * interrupt.
                   1512:  * see suswintr(9)
                   1513:  */
                   1514: /* LINTSTUB: Func: int suswintr(void *base, short c) */
                   1515: ENTRY(suswintr)
1.24      yamt     1516:        cmpl    $TLBSTATE_VALID, CPUVAR(TLBSTATE)
                   1517:        jnz     _C_LABEL(fusuaddrfault)
1.1       fvdl     1518:        movl    4(%esp),%edx
                   1519:        cmpl    $VM_MAXUSER_ADDRESS-2,%edx
                   1520:        ja      _C_LABEL(fusuaddrfault)
1.5       thorpej  1521:        movl    CPUVAR(CURLWP),%ecx
                   1522:        movl    L_ADDR(%ecx),%ecx
1.1       fvdl     1523:        movl    $_C_LABEL(fusubail),PCB_ONFAULT(%ecx)
                   1524:
                   1525: #if defined(I386_CPU)
                   1526: #if defined(I486_CPU) || defined(I586_CPU) || defined(I686_CPU)
                   1527:        cmpl    $CPUCLASS_386,_C_LABEL(cpu_class)
                   1528:        jne     2f
                   1529: #endif /* I486_CPU || I586_CPU || I686_CPU */
                   1530:
                   1531:        movl    %edx,%eax
                   1532:        shrl    $PGSHIFT,%eax           # calculate pte address
1.31      junyoung 1533:        testb   $PG_RW,PTE_BASE(,%eax,4)
1.1       fvdl     1534:        jnz     1f
                   1535:
                   1536:        /* Simulate a trap. */
                   1537:        jmp     _C_LABEL(fusubail)
                   1538:
                   1539: 1:     /* XXX also need to check the following byte for validity! */
                   1540: #endif
                   1541:
                   1542: 2:     movl    8(%esp),%eax
                   1543:        movw    %ax,(%edx)
                   1544:        xorl    %eax,%eax
                   1545:        movl    %eax,PCB_ONFAULT(%ecx)
                   1546:        ret
                   1547:
                   1548: /*
                   1549:  * int subyte(void *uaddr, char x);
                   1550:  * Store a byte in the user's address space.
                   1551:  * see subyte(9)
                   1552:  */
                   1553: /* LINTSTUB: Func: int subyte(void *base, int c) */
                   1554: ENTRY(subyte)
1.24      yamt     1555:        DO_DEFERRED_SWITCH(%eax)
1.1       fvdl     1556:        movl    4(%esp),%edx
                   1557:        cmpl    $VM_MAXUSER_ADDRESS-1,%edx
                   1558:        ja      _C_LABEL(fusuaddrfault)
                   1559:
                   1560: #if defined(I386_CPU)
                   1561: #if defined(I486_CPU) || defined(I586_CPU) || defined(I686_CPU)
                   1562:        cmpl    $CPUCLASS_386,_C_LABEL(cpu_class)
                   1563:        jne     2f
                   1564: #endif /* I486_CPU || I586_CPU || I686_CPU */
                   1565:
1.30      junyoung 1566:        GET_CURPCB(%eax)
1.1       fvdl     1567:        movl    $3f,PCB_ONFAULT(%eax)
                   1568:
                   1569:        movl    %edx,%eax
                   1570:        shrl    $PGSHIFT,%eax           # calculate pte address
1.31      junyoung 1571:        testb   $PG_RW,PTE_BASE(,%eax,4)
1.1       fvdl     1572:        jnz     1f
                   1573:
                   1574: 3:     /* Simulate a trap. */
                   1575:        pushl   %edx
                   1576:        pushl   %edx
                   1577:        call    _C_LABEL(trapwrite)     # trapwrite(addr)
                   1578:        addl    $4,%esp                 # clear parameter from the stack
                   1579:        popl    %edx
                   1580:        GET_CURPCB(%ecx)
                   1581:        testl   %eax,%eax
                   1582:        jnz     _C_LABEL(fusufault)
                   1583:
                   1584: 1:
                   1585: #endif
                   1586:
                   1587: 2:     GET_CURPCB(%ecx)
                   1588:        movl    $_C_LABEL(fusufault),PCB_ONFAULT(%ecx)
                   1589:
                   1590:        movb    8(%esp),%al
                   1591:        movb    %al,(%edx)
                   1592:        xorl    %eax,%eax
                   1593:        movl    %eax,PCB_ONFAULT(%ecx)
                   1594:        ret
                   1595:
                   1596: /*****************************************************************************/
                   1597:
                   1598: /*
                   1599:  * The following is i386-specific nonsense.
                   1600:  */
                   1601:
                   1602: /*
                   1603:  * void lgdt(struct region_descriptor *rdp);
                   1604:  * Load a new GDT pointer (and do any necessary cleanup).
                   1605:  * XXX It's somewhat questionable whether reloading all the segment registers
                   1606:  * is necessary, since the actual descriptor data is not changed except by
                   1607:  * process creation and exit, both of which clean up via task switches.  OTOH,
                   1608:  * this only happens at run time when the GDT is resized.
                   1609:  */
                   1610: /* LINTSTUB: Func: void lgdt(struct region_descriptor *rdp) */
                   1611: NENTRY(lgdt)
                   1612:        /* Reload the descriptor table. */
                   1613:        movl    4(%esp),%eax
                   1614:        lgdt    (%eax)
                   1615:        /* Flush the prefetch queue. */
                   1616:        jmp     1f
                   1617:        nop
                   1618: 1:     /* Reload "stale" selectors. */
                   1619:        movl    $GSEL(GDATA_SEL, SEL_KPL),%eax
                   1620:        movw    %ax,%ds
                   1621:        movw    %ax,%es
                   1622:        movw    %ax,%gs
                   1623:        movw    %ax,%ss
                   1624:        movl    $GSEL(GCPU_SEL, SEL_KPL),%eax
                   1625:        movw    %ax,%fs
                   1626:        /* Reload code selector by doing intersegment return. */
                   1627:        popl    %eax
                   1628:        pushl   $GSEL(GCODE_SEL, SEL_KPL)
                   1629:        pushl   %eax
                   1630:        lret
                   1631:
                   1632: /*****************************************************************************/
                   1633:
                   1634: /*
                   1635:  * These functions are primarily used by DDB.
                   1636:  */
                   1637:
                   1638: /* LINTSTUB: Func: int setjmp (label_t *l) */
                   1639: ENTRY(setjmp)
                   1640:        movl    4(%esp),%eax
                   1641:        movl    %ebx,(%eax)             # save ebx
                   1642:        movl    %esp,4(%eax)            # save esp
                   1643:        movl    %ebp,8(%eax)            # save ebp
                   1644:        movl    %esi,12(%eax)           # save esi
                   1645:        movl    %edi,16(%eax)           # save edi
                   1646:        movl    (%esp),%edx             # get rta
                   1647:        movl    %edx,20(%eax)           # save eip
                   1648:        xorl    %eax,%eax               # return (0);
                   1649:        ret
                   1650:
                   1651: /* LINTSTUB: Func: void longjmp (label_t *l) */
                   1652: ENTRY(longjmp)
                   1653:        movl    4(%esp),%eax
                   1654:        movl    (%eax),%ebx             # restore ebx
                   1655:        movl    4(%eax),%esp            # restore esp
                   1656:        movl    8(%eax),%ebp            # restore ebp
                   1657:        movl    12(%eax),%esi           # restore esi
                   1658:        movl    16(%eax),%edi           # restore edi
                   1659:        movl    20(%eax),%edx           # get rta
                   1660:        movl    %edx,(%esp)             # put in return frame
                   1661:        xorl    %eax,%eax               # return (1);
                   1662:        incl    %eax
                   1663:        ret
                   1664:
                   1665: /*****************************************************************************/
                   1666:
                   1667:        .globl  _C_LABEL(sched_whichqs),_C_LABEL(sched_qs)
                   1668:        .globl  _C_LABEL(uvmexp),_C_LABEL(panic)
                   1669:
                   1670: #ifdef DIAGNOSTIC
                   1671: NENTRY(switch_error)
                   1672:        pushl   $1f
                   1673:        call    _C_LABEL(panic)
                   1674:        /* NOTREACHED */
                   1675: 1:     .asciz  "cpu_switch"
                   1676: #endif /* DIAGNOSTIC */
                   1677:
                   1678: /*
1.5       thorpej  1679:  * void cpu_switch(struct lwp *)
1.1       fvdl     1680:  * Find a runnable process and switch to it.  Wait if necessary.  If the new
                   1681:  * process is the same as the old one, we short-circuit the context save and
                   1682:  * restore.
1.30      junyoung 1683:  *
1.1       fvdl     1684:  * Note that the stack frame layout is known to "struct switchframe"
1.30      junyoung 1685:  * in <machine/frame.h> and to the code in cpu_fork() which initializes
1.5       thorpej  1686:  * it for a new lwp.
1.1       fvdl     1687:  */
                   1688: ENTRY(cpu_switch)
                   1689:        pushl   %ebx
                   1690:        pushl   %esi
                   1691:        pushl   %edi
                   1692:
                   1693: #ifdef DEBUG
                   1694:        cmpl    $IPL_SCHED,CPUVAR(ILEVEL)
                   1695:        jae     1f
1.5       thorpej  1696:        pushl   $2f
1.1       fvdl     1697:        call    _C_LABEL(panic)
                   1698:        /* NOTREACHED */
1.5       thorpej  1699: 2:     .asciz  "not splsched() in cpu_switch!"
1.30      junyoung 1700: 1:
1.1       fvdl     1701: #endif /* DEBUG */
1.30      junyoung 1702:
1.5       thorpej  1703:        movl    16(%esp),%esi           # current
1.1       fvdl     1704:
                   1705:        /*
1.5       thorpej  1706:         * Clear curlwp so that we don't accumulate system time while idle.
                   1707:         * This also insures that schedcpu() will move the old lwp to
1.1       fvdl     1708:         * the correct queue if it happens to get called from the spllower()
                   1709:         * below and changes the priority.  (See corresponding comment in
                   1710:         * userret()).
                   1711:         */
1.5       thorpej  1712:        movl    $0,CPUVAR(CURLWP)
1.1       fvdl     1713:        /*
1.5       thorpej  1714:         * First phase: find new lwp.
1.1       fvdl     1715:         *
                   1716:         * Registers:
                   1717:         *   %eax - queue head, scratch, then zero
                   1718:         *   %ebx - queue number
                   1719:         *   %ecx - cached value of whichqs
1.5       thorpej  1720:         *   %edx - next lwp in queue
                   1721:         *   %esi - old lwp
                   1722:         *   %edi - new lwp
1.1       fvdl     1723:         */
                   1724:
1.5       thorpej  1725:        /* Look for new lwp. */
1.1       fvdl     1726:        cli                             # splhigh doesn't do a cli
                   1727:        movl    _C_LABEL(sched_whichqs),%ecx
                   1728:        bsfl    %ecx,%ebx               # find a full q
                   1729:        jnz     switch_dequeue
                   1730:
                   1731:        /*
                   1732:         * idling:      save old context.
                   1733:         *
                   1734:         * Registers:
                   1735:         *   %eax, %ecx - scratch
1.5       thorpej  1736:         *   %esi - old lwp, then old pcb
1.1       fvdl     1737:         *   %edi - idle pcb
                   1738:         */
                   1739:
                   1740:        pushl   %esi
1.24      yamt     1741:        call    _C_LABEL(pmap_deactivate2)      # pmap_deactivate(oldproc)
1.1       fvdl     1742:        addl    $4,%esp
                   1743:
1.5       thorpej  1744:        movl    L_ADDR(%esi),%esi
1.1       fvdl     1745:
                   1746:        /* Save stack pointers. */
                   1747:        movl    %esp,PCB_ESP(%esi)
                   1748:        movl    %ebp,PCB_EBP(%esi)
                   1749:
                   1750:        /* Find idle PCB for this CPU */
                   1751: #ifndef MULTIPROCESSOR
1.5       thorpej  1752:        movl    $_C_LABEL(lwp0),%ebx
                   1753:        movl    L_ADDR(%ebx),%edi
                   1754:        movl    L_MD_TSS_SEL(%ebx),%edx
1.1       fvdl     1755: #else
                   1756:        movl    CPUVAR(IDLE_PCB),%edi
                   1757:        movl    CPUVAR(IDLE_TSS_SEL),%edx
                   1758: #endif
1.5       thorpej  1759:        movl    $0,CPUVAR(CURLWP)               /* In case we fault... */
1.1       fvdl     1760:
                   1761:        /* Restore the idle context (avoid interrupts) */
                   1762:        cli
                   1763:
                   1764:        /* Restore stack pointers. */
                   1765:        movl    PCB_ESP(%edi),%esp
                   1766:        movl    PCB_EBP(%edi),%ebp
                   1767:
                   1768:        /* Switch TSS. Reset "task busy" flag before loading. */
1.26      yamt     1769:        movl    %cr3,%eax
                   1770:        movl    %eax,PCB_CR3(%edi)
1.1       fvdl     1771: #ifdef MULTIPROCESSOR
                   1772:        movl    CPUVAR(GDT),%eax
                   1773: #else
                   1774:        movl    _C_LABEL(gdt),%eax
                   1775: #endif
                   1776:        andl    $~0x0200,4-SEL_KPL(%eax,%edx,1)
                   1777:        ltr     %dx
                   1778:
                   1779:        /* We're always in the kernel, so we don't need the LDT. */
                   1780:
                   1781:        /* Restore cr0 (including FPU state). */
                   1782:        movl    PCB_CR0(%edi),%ecx
                   1783:        movl    %ecx,%cr0
                   1784:
                   1785:        /* Record new pcb. */
                   1786:        SET_CURPCB(%edi)
                   1787:
                   1788:        xorl    %esi,%esi
                   1789:        sti
1.30      junyoung 1790: idle_unlock:
                   1791: #if defined(MULTIPROCESSOR) || defined(LOCKDEBUG)
1.1       fvdl     1792:        call    _C_LABEL(sched_unlock_idle)
                   1793: #endif
                   1794:        /* Interrupts are okay again. */
1.2       fvdl     1795:        pushl   $IPL_NONE               # spl0()
1.1       fvdl     1796:        call    _C_LABEL(Xspllower)     # process pending interrupts
1.2       fvdl     1797:        addl    $4,%esp
1.1       fvdl     1798:        jmp     idle_start
1.30      junyoung 1799: idle_zero:
1.1       fvdl     1800:        sti
                   1801:        call    _C_LABEL(uvm_pageidlezero)
                   1802:        cli
                   1803:        cmpl    $0,_C_LABEL(sched_whichqs)
                   1804:        jnz     idle_exit
                   1805: idle_loop:
                   1806:        /* Try to zero some pages. */
                   1807:        movl    _C_LABEL(uvm)+UVM_PAGE_IDLE_ZERO,%ecx
                   1808:        testl   %ecx,%ecx
                   1809:        jnz     idle_zero
                   1810:        sti
                   1811:        hlt
                   1812: NENTRY(mpidle)
1.30      junyoung 1813: idle_start:
1.1       fvdl     1814:        cli
                   1815:        cmpl    $0,_C_LABEL(sched_whichqs)
                   1816:        jz      idle_loop
1.30      junyoung 1817: idle_exit:
1.1       fvdl     1818:        movl    $IPL_HIGH,CPUVAR(ILEVEL)                # splhigh
1.14      fvdl     1819:        sti
1.30      junyoung 1820: #if defined(MULTIPROCESSOR) || defined(LOCKDEBUG)
1.1       fvdl     1821:        call    _C_LABEL(sched_lock_idle)
                   1822: #endif
                   1823:        movl    _C_LABEL(sched_whichqs),%ecx
                   1824:        bsfl    %ecx,%ebx
                   1825:        jz      idle_unlock
                   1826:
1.30      junyoung 1827: switch_dequeue:
                   1828:        /*
1.1       fvdl     1829:         * we're running at splhigh(), but it's otherwise okay to take
1.30      junyoung 1830:         * interrupts here.
1.1       fvdl     1831:         */
                   1832:        sti
                   1833:        leal    _C_LABEL(sched_qs)(,%ebx,8),%eax # select q
                   1834:
1.5       thorpej  1835:        movl    L_FORW(%eax),%edi       # unlink from front of process q
1.1       fvdl     1836: #ifdef DIAGNOSTIC
                   1837:        cmpl    %edi,%eax               # linked to self (i.e. nothing queued)?
                   1838:        je      _C_LABEL(switch_error)  # not possible
                   1839: #endif /* DIAGNOSTIC */
1.5       thorpej  1840:        movl    L_FORW(%edi),%edx
                   1841:        movl    %edx,L_FORW(%eax)
                   1842:        movl    %eax,L_BACK(%edx)
1.1       fvdl     1843:
                   1844:        cmpl    %edx,%eax               # q empty?
                   1845:        jne     3f
                   1846:
                   1847:        btrl    %ebx,%ecx               # yes, clear to indicate empty
                   1848:        movl    %ecx,_C_LABEL(sched_whichqs) # update q status
                   1849:
                   1850: 3:     /* We just did it. */
                   1851:        xorl    %eax,%eax
                   1852:        CLEAR_RESCHED(%eax)
                   1853:
1.5       thorpej  1854: switch_resume:
1.1       fvdl     1855: #ifdef DIAGNOSTIC
1.5       thorpej  1856:        cmpl    %eax,L_WCHAN(%edi)      # Waiting for something?
1.1       fvdl     1857:        jne     _C_LABEL(switch_error)  # Yes; shouldn't be queued.
1.5       thorpej  1858:        cmpb    $LSRUN,L_STAT(%edi)     # In run state?
1.1       fvdl     1859:        jne     _C_LABEL(switch_error)  # No; shouldn't be queued.
                   1860: #endif /* DIAGNOSTIC */
                   1861:
1.5       thorpej  1862:        /* Isolate lwp.  XXX Is this necessary? */
                   1863:        movl    %eax,L_BACK(%edi)
1.1       fvdl     1864:
1.5       thorpej  1865:        /* Record new lwp. */
                   1866:        movb    $LSONPROC,L_STAT(%edi)  # l->l_stat = LSONPROC
                   1867:        SET_CURLWP(%edi,%ecx)
1.1       fvdl     1868:
1.5       thorpej  1869:        /* Skip context switch if same lwp. */
1.10      fvdl     1870:        xorl    %ebx,%ebx
1.1       fvdl     1871:        cmpl    %edi,%esi
                   1872:        je      switch_return
                   1873:
1.5       thorpej  1874:        /* If old lwp exited, don't bother. */
1.1       fvdl     1875:        testl   %esi,%esi
                   1876:        jz      switch_exited
                   1877:
                   1878:        /*
                   1879:         * Second phase: save old context.
                   1880:         *
                   1881:         * Registers:
                   1882:         *   %eax, %ecx - scratch
1.5       thorpej  1883:         *   %esi - old lwp, then old pcb
                   1884:         *   %edi - new lwp
1.1       fvdl     1885:         */
                   1886:
                   1887:        pushl   %esi
1.24      yamt     1888:        call    _C_LABEL(pmap_deactivate2)      # pmap_deactivate(oldproc)
1.1       fvdl     1889:        addl    $4,%esp
                   1890:
1.5       thorpej  1891:        movl    L_ADDR(%esi),%esi
1.1       fvdl     1892:
                   1893:        /* Save stack pointers. */
                   1894:        movl    %esp,PCB_ESP(%esi)
                   1895:        movl    %ebp,PCB_EBP(%esi)
                   1896:
                   1897: switch_exited:
                   1898:        /*
                   1899:         * Third phase: restore saved context.
                   1900:         *
                   1901:         * Registers:
                   1902:         *   %eax, %ebx, %ecx, %edx - scratch
                   1903:         *   %esi - new pcb
1.5       thorpej  1904:         *   %edi - new lwp
1.1       fvdl     1905:         */
                   1906:
                   1907:        /* No interrupts while loading new state. */
                   1908:        cli
1.5       thorpej  1909:        movl    L_ADDR(%edi),%esi
1.1       fvdl     1910:
                   1911:        /* Restore stack pointers. */
                   1912:        movl    PCB_ESP(%esi),%esp
                   1913:        movl    PCB_EBP(%esi),%ebp
                   1914:
                   1915: #if 0
                   1916:        /* Don't bother with the rest if switching to a system process. */
1.5       thorpej  1917:        testl   $P_SYSTEM,L_FLAG(%edi); XXX NJWLWP lwp's don't have P_SYSTEM!
1.1       fvdl     1918:        jnz     switch_restored
                   1919: #endif
                   1920:
1.26      yamt     1921:        /* Switch TSS. Reset "task busy" flag before loading. */
                   1922:        movl    %cr3,%eax
                   1923:        movl    %eax,PCB_CR3(%esi) /* XXX should be done by pmap_activate? */
1.1       fvdl     1924: #ifdef MULTIPROCESSOR
                   1925:        movl    CPUVAR(GDT),%eax
1.30      junyoung 1926: #else
1.1       fvdl     1927:        /* Load TSS info. */
                   1928:        movl    _C_LABEL(gdt),%eax
                   1929: #endif
1.5       thorpej  1930:        movl    L_MD_TSS_SEL(%edi),%edx
1.1       fvdl     1931:
                   1932:        andl    $~0x0200,4(%eax,%edx, 1)
                   1933:        ltr     %dx
                   1934:
                   1935:        pushl   %edi
                   1936:        call    _C_LABEL(pmap_activate)         # pmap_activate(p)
                   1937:        addl    $4,%esp
                   1938:
                   1939: #if 0
                   1940: switch_restored:
                   1941: #endif
                   1942:        /* Restore cr0 (including FPU state). */
                   1943:        movl    PCB_CR0(%esi),%ecx
                   1944: #ifdef MULTIPROCESSOR
1.30      junyoung 1945:        /*
1.22      wiz      1946:         * If our floating point registers are on a different CPU,
1.1       fvdl     1947:         * clear CR0_TS so we'll trap rather than reuse bogus state.
                   1948:         */
                   1949:        movl    PCB_FPCPU(%esi),%ebx
                   1950:        cmpl    CPUVAR(SELF),%ebx
                   1951:        jz      1f
                   1952:        orl     $CR0_TS,%ecx
1.30      junyoung 1953: 1:
                   1954: #endif
1.1       fvdl     1955:        movl    %ecx,%cr0
                   1956:
                   1957:        /* Record new pcb. */
                   1958:        SET_CURPCB(%esi)
                   1959:
                   1960:        /* Interrupts are okay again. */
                   1961:        sti
                   1962:
                   1963: /*
                   1964:  *  Check for restartable atomic sequences (RAS)
                   1965:  */
1.5       thorpej  1966:        movl    CPUVAR(CURLWP),%edi
                   1967:        movl    L_PROC(%edi),%esi
1.20      dsl      1968:        cmpl    $0,P_RASLIST(%esi)
                   1969:        jne     2f
1.1       fvdl     1970: 1:
1.10      fvdl     1971:        movl    $1,%ebx
1.1       fvdl     1972:
                   1973: switch_return:
1.30      junyoung 1974: #if defined(MULTIPROCESSOR) || defined(LOCKDEBUG)
1.1       fvdl     1975:        call    _C_LABEL(sched_unlock_idle)
                   1976: #endif
1.28      yamt     1977:        cmpl    $0,CPUVAR(IPENDING)
                   1978:        jz      3f
1.2       fvdl     1979:        pushl   $IPL_NONE               # spl0()
1.1       fvdl     1980:        call    _C_LABEL(Xspllower)     # process pending interrupts
1.2       fvdl     1981:        addl    $4,%esp
1.28      yamt     1982: 3:
1.1       fvdl     1983:        movl    $IPL_HIGH,CPUVAR(ILEVEL)        # splhigh()
1.9       fvdl     1984:
                   1985:        movl    %ebx,%eax
1.30      junyoung 1986:
1.1       fvdl     1987:        popl    %edi
                   1988:        popl    %esi
                   1989:        popl    %ebx
                   1990:        ret
1.20      dsl      1991:
                   1992: 2:                                     # check RAS list
                   1993:        movl    L_MD_REGS(%edi),%ebx
                   1994:        movl    TF_EIP(%ebx),%eax
                   1995:        pushl   %eax
                   1996:        pushl   %esi
                   1997:        call    _C_LABEL(ras_lookup)
                   1998:        addl    $8,%esp
                   1999:        cmpl    $-1,%eax
                   2000:        je      1b
                   2001:        movl    %eax,TF_EIP(%ebx)
                   2002:        jmp     1b
1.1       fvdl     2003:
                   2004: /*
1.5       thorpej  2005:  * void cpu_switchto(struct lwp *current, struct lwp *next)
                   2006:  * Switch to the specified next LWP.
                   2007:  */
                   2008: ENTRY(cpu_switchto)
                   2009:        pushl   %ebx
                   2010:        pushl   %esi
                   2011:        pushl   %edi
                   2012:
                   2013: #ifdef DEBUG
                   2014:        cmpl    $IPL_SCHED,CPUVAR(ILEVEL)
                   2015:        jae     1f
                   2016:        pushl   $2f
                   2017:        call    _C_LABEL(panic)
                   2018:        /* NOTREACHED */
                   2019: 2:     .asciz  "not splsched() in cpu_switchto!"
                   2020: 1:
                   2021: #endif /* DEBUG */
                   2022:
                   2023:        movl    16(%esp),%esi           # current
                   2024:        movl    20(%esp),%edi           # next
                   2025:
                   2026:        /*
                   2027:         * Clear curlwp so that we don't accumulate system time while idle.
                   2028:         * This also insures that schedcpu() will move the old process to
                   2029:         * the correct queue if it happens to get called from the spllower()
                   2030:         * below and changes the priority.  (See corresponding comment in
                   2031:         * usrret()).
                   2032:         *
                   2033:         * XXX Is this necessary?  We know we won't go idle.
                   2034:         */
                   2035:        movl    $0,CPUVAR(CURLWP)
                   2036:
                   2037:        /*
                   2038:         * We're running at splhigh(), but it's otherwise okay to take
                   2039:         * interrupts here.
                   2040:         */
                   2041:        sti
                   2042:
                   2043:        /* Jump into the middle of cpu_switch */
                   2044:        xorl    %eax,%eax
                   2045:        jmp     switch_resume
                   2046:
                   2047: /*
1.21      jdolecek 2048:  * void cpu_exit(struct lwp *l)
1.30      junyoung 2049:  * Switch to the appropriate idle context (lwp0's if uniprocessor; the CPU's
                   2050:  * if multiprocessor) and deallocate the address space and kernel stack for p.
1.1       fvdl     2051:  * Then jump into cpu_switch(), as if we were in the idle proc all along.
                   2052:  */
                   2053: #ifndef MULTIPROCESSOR
1.5       thorpej  2054:        .globl  _C_LABEL(lwp0)
1.1       fvdl     2055: #endif
1.21      jdolecek 2056: /* LINTSTUB: Func: void cpu_exit(struct lwp *l) */
                   2057: ENTRY(cpu_exit)
1.1       fvdl     2058:        movl    4(%esp),%edi            # old process
                   2059: #ifndef MULTIPROCESSOR
1.5       thorpej  2060:        movl    $_C_LABEL(lwp0),%ebx
                   2061:        movl    L_ADDR(%ebx),%esi
                   2062:        movl    L_MD_TSS_SEL(%ebx),%edx
1.1       fvdl     2063: #else
                   2064:        movl    CPUVAR(IDLE_PCB),%esi
                   2065:        movl    CPUVAR(IDLE_TSS_SEL),%edx
                   2066: #endif
                   2067:        /* In case we fault... */
1.5       thorpej  2068:        movl    $0,CPUVAR(CURLWP)
1.1       fvdl     2069:
                   2070:        /* Restore the idle context. */
                   2071:        cli
                   2072:
                   2073:        /* Restore stack pointers. */
                   2074:        movl    PCB_ESP(%esi),%esp
                   2075:        movl    PCB_EBP(%esi),%ebp
                   2076:
1.26      yamt     2077:        /* Switch TSS. Reset "task busy" flag before loading. */
                   2078:        movl    %cr3,%eax
                   2079:        movl    %eax,PCB_CR3(%esi)
1.1       fvdl     2080: #ifdef MULTIPROCESSOR
                   2081:        movl    CPUVAR(GDT),%eax
1.30      junyoung 2082: #else
1.1       fvdl     2083:        /* Load TSS info. */
                   2084:        movl    _C_LABEL(gdt),%eax
                   2085: #endif
                   2086:
                   2087:        andl    $~0x0200,4-SEL_KPL(%eax,%edx,1)
                   2088:        ltr     %dx
                   2089:
                   2090:        /* We're always in the kernel, so we don't need the LDT. */
                   2091:
                   2092:        /* Restore cr0 (including FPU state). */
                   2093:        movl    PCB_CR0(%esi),%ecx
                   2094:        movl    %ecx,%cr0
                   2095:
                   2096:        /* Record new pcb. */
                   2097:        SET_CURPCB(%esi)
                   2098:
                   2099:        /* Interrupts are okay again. */
                   2100:        sti
                   2101:
                   2102:        /*
1.21      jdolecek 2103:         * Schedule the dead LWP's stack to be freed.
1.1       fvdl     2104:         */
1.21      jdolecek 2105:        pushl   %edi
                   2106:        call    _C_LABEL(lwp_exit2)
1.1       fvdl     2107:        addl    $4,%esp
                   2108:
                   2109:        /* Jump into cpu_switch() with the right state. */
                   2110:        xorl    %esi,%esi
1.5       thorpej  2111:        movl    %esi,CPUVAR(CURLWP)
1.1       fvdl     2112:        jmp     idle_start
                   2113:
                   2114: /*
                   2115:  * void savectx(struct pcb *pcb);
                   2116:  * Update pcb, saving current processor state.
                   2117:  */
                   2118: /* LINTSTUB: Func: void savectx(struct pcb *pcb) */
                   2119: ENTRY(savectx)
                   2120:        movl    4(%esp),%edx            # edx = p->p_addr
1.30      junyoung 2121:
1.1       fvdl     2122:        /* Save stack pointers. */
                   2123:        movl    %esp,PCB_ESP(%edx)
                   2124:        movl    %ebp,PCB_EBP(%edx)
                   2125:
                   2126:        ret
                   2127:
                   2128: /*
                   2129:  * Old call gate entry for syscall
                   2130:  */
                   2131: /* LINTSTUB: Var: char Xosyscall[1]; */
                   2132: IDTVEC(osyscall)
                   2133:        /* Set eflags in trap frame. */
                   2134:        pushfl
                   2135:        popl    8(%esp)
                   2136:        pushl   $7              # size of instruction for restart
                   2137:        jmp     syscall1
                   2138:
                   2139: /*
                   2140:  * Trap gate entry for syscall
                   2141:  */
                   2142: /* LINTSTUB: Var: char Xsyscall[1]; */
                   2143: IDTVEC(syscall)
                   2144:        pushl   $2              # size of instruction for restart
                   2145: syscall1:
                   2146:        pushl   $T_ASTFLT       # trap # for doing ASTs
                   2147:        INTRENTRY
                   2148:
                   2149: #ifdef DIAGNOSTIC
1.24      yamt     2150:        cmpl    $0, CPUVAR(WANT_PMAPLOAD)
                   2151:        jz      1f
                   2152:        pushl   $6f
                   2153:        call    _C_LABEL(printf)
                   2154:        addl    $4, %esp
                   2155: 1:
1.1       fvdl     2156:        movl    CPUVAR(ILEVEL),%ebx
                   2157:        testl   %ebx,%ebx
                   2158:        jz      1f
                   2159:        pushl   $5f
                   2160:        call    _C_LABEL(printf)
                   2161:        addl    $4,%esp
                   2162: #ifdef DDB
                   2163:        int     $3
                   2164: #endif
1.30      junyoung 2165: 1:
1.1       fvdl     2166: #endif /* DIAGNOSTIC */
1.5       thorpej  2167:        movl    CPUVAR(CURLWP),%edx
                   2168:        movl    %esp,L_MD_REGS(%edx)    # save pointer to frame
                   2169:        movl    L_PROC(%edx),%edx
1.15      fvdl     2170:        pushl   %esp
1.1       fvdl     2171:        call    *P_MD_SYSCALL(%edx)     # get pointer to syscall() function
1.15      fvdl     2172:        addl    $4,%esp
1.27      yamt     2173: .Lsyscall_checkast:
1.24      yamt     2174:        /* Check for ASTs on exit to user mode. */
1.1       fvdl     2175:        cli
1.5       thorpej  2176:        CHECK_ASTPENDING(%eax)
1.1       fvdl     2177:        je      1f
                   2178:        /* Always returning to user mode here. */
1.5       thorpej  2179:        CLEAR_ASTPENDING(%eax)
1.1       fvdl     2180:        sti
                   2181:        /* Pushed T_ASTFLT into tf_trapno on entry. */
1.15      fvdl     2182:        pushl   %esp
1.1       fvdl     2183:        call    _C_LABEL(trap)
1.15      fvdl     2184:        addl    $4,%esp
1.27      yamt     2185:        jmp     .Lsyscall_checkast      /* re-check ASTs */
1.24      yamt     2186: 1:     CHECK_DEFERRED_SWITCH(%eax)
                   2187:        jnz     9f
1.1       fvdl     2188: #ifndef DIAGNOSTIC
1.24      yamt     2189:        INTRFASTEXIT
1.1       fvdl     2190: #else /* DIAGNOSTIC */
1.24      yamt     2191:        cmpl    $IPL_NONE,CPUVAR(ILEVEL)
1.1       fvdl     2192:        jne     3f
                   2193:        INTRFASTEXIT
                   2194: 3:     sti
                   2195:        pushl   $4f
                   2196:        call    _C_LABEL(printf)
                   2197:        addl    $4,%esp
                   2198: #ifdef DDB
                   2199:        int     $3
                   2200: #endif /* DDB */
                   2201:        movl    $IPL_NONE,CPUVAR(ILEVEL)
                   2202:        jmp     2b
                   2203: 4:     .asciz  "WARNING: SPL NOT LOWERED ON SYSCALL EXIT\n"
1.30      junyoung 2204: 5:     .asciz  "WARNING: SPL NOT ZERO ON SYSCALL ENTRY\n"
                   2205: 6:     .asciz  "WARNING: WANT PMAPLOAD ON SYSCALL ENTRY\n"
1.1       fvdl     2206: #endif /* DIAGNOSTIC */
1.24      yamt     2207: 9:     sti
                   2208:        call    _C_LABEL(pmap_load)
1.27      yamt     2209:        jmp     .Lsyscall_checkast      /* re-check ASTs */
1.1       fvdl     2210:
                   2211: #if NNPX > 0
                   2212: /*
                   2213:  * Special interrupt handlers.  Someday intr0-intr15 will be used to count
                   2214:  * interrupts.  We'll still need a special exception 16 handler.  The busy
                   2215:  * latch stuff in probintr() can be moved to npxprobe().
                   2216:  */
                   2217:
                   2218: /* LINTSTUB: Func: void probeintr(void) */
                   2219: NENTRY(probeintr)
                   2220:        ss
                   2221:        incl    _C_LABEL(npx_intrs_while_probing)
                   2222:        pushl   %eax
                   2223:        movb    $0x20,%al       # EOI (asm in strings loses cpp features)
                   2224:        outb    %al,$0xa0       # IO_ICU2
                   2225:        outb    %al,$0x20       # IO_ICU1
                   2226:        movb    $0,%al
                   2227:        outb    %al,$0xf0       # clear BUSY# latch
                   2228:        popl    %eax
                   2229:        iret
                   2230:
                   2231: /* LINTSTUB: Func: void probetrap(void) */
                   2232: NENTRY(probetrap)
                   2233:        ss
                   2234:        incl    _C_LABEL(npx_traps_while_probing)
                   2235:        fnclex
                   2236:        iret
                   2237:
                   2238: /* LINTSTUB: Func: int npx586bug1(int a, int b) */
                   2239: NENTRY(npx586bug1)
                   2240:        fildl   4(%esp)         # x
                   2241:        fildl   8(%esp)         # y
                   2242:        fld     %st(1)
                   2243:        fdiv    %st(1),%st      # x/y
                   2244:        fmulp   %st,%st(1)      # (x/y)*y
                   2245:        fsubrp  %st,%st(1)      # x-(x/y)*y
                   2246:        pushl   $0
                   2247:        fistpl  (%esp)
                   2248:        popl    %eax
                   2249:        ret
                   2250: #endif /* NNPX > 0 */

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