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Annotation of src/sys/arch/i386/i386/locore.S, Revision 1.8

1.8     ! fvdl        1: /*     $NetBSD: locore.S,v 1.7 2003/04/08 23:48:48 thorpej Exp $       */
1.1       fvdl        2:
                      3: /*-
                      4:  * Copyright (c) 1998, 2000 The NetBSD Foundation, Inc.
                      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.
                     54:  * 3. All advertising materials mentioning features or use of this software
                     55:  *    must display the following acknowledgement:
                     56:  *     This product includes software developed by the University of
                     57:  *     California, Berkeley and its contributors.
                     58:  * 4. Neither the name of the University nor the names of its contributors
                     59:  *    may be used to endorse or promote products derived from this software
                     60:  *    without specific prior written permission.
                     61:  *
                     62:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
                     63:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     64:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     65:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
                     66:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     67:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     68:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     69:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     70:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     71:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     72:  * SUCH DAMAGE.
                     73:  *
                     74:  *     @(#)locore.s    7.3 (Berkeley) 5/13/91
                     75:  */
                     76:
                     77: #include "opt_cputype.h"
                     78: #include "opt_ddb.h"
                     79: #include "opt_ipkdb.h"
                     80: #include "opt_vm86.h"
                     81: #include "opt_user_ldt.h"
                     82: #include "opt_dummy_nops.h"
                     83: #include "opt_compat_oldboot.h"
                     84: #include "opt_multiprocessor.h"
                     85: #include "opt_lockdebug.h"
                     86: #include "opt_realmem.h"
                     87:
                     88: #include "npx.h"
                     89: #include "assym.h"
                     90: #include "apm.h"
                     91: #include "lapic.h"
                     92: #include "ioapic.h"
1.8     ! fvdl       93: #include "ksyms.h"
1.1       fvdl       94:
                     95: #include <sys/errno.h>
                     96: #include <sys/syscall.h>
                     97:
                     98: #include <machine/cputypes.h>
                     99: #include <machine/param.h>
                    100: #include <machine/pte.h>
                    101: #include <machine/segments.h>
                    102: #include <machine/specialreg.h>
                    103: #include <machine/trap.h>
                    104: #include <machine/bootinfo.h>
                    105:
                    106: #if NLAPIC > 0
                    107: #include <machine/i82489reg.h>
                    108: #endif
                    109:
                    110: /* LINTSTUB: include <sys/types.h> */
                    111: /* LINTSTUB: include <machine/cpu.h> */
                    112: /* LINTSTUB: include <sys/systm.h> */
                    113:
                    114: #include <machine/asm.h>
                    115:
                    116: #if defined(MULTIPROCESSOR)
                    117:
1.5       thorpej   118: #define SET_CURLWP(lwp,cpu)                            \
1.1       fvdl      119:        movl    CPUVAR(SELF),cpu                ;       \
1.5       thorpej   120:        movl    lwp,CPUVAR(CURLWP)      ;       \
                    121:        movl    cpu,L_CPU(lwp)
1.1       fvdl      122:
                    123: #else
                    124:
1.5       thorpej   125: #define SET_CURLWP(lwp,tcpu)           movl    lwp,CPUVAR(CURLWP)
                    126: #define GET_CURLWP(reg)                        movl    CPUVAR(CURLWP),reg
1.1       fvdl      127:
                    128: #endif
                    129:
                    130: #define GET_CURPCB(reg)                        movl    CPUVAR(CURPCB),reg
                    131: #define SET_CURPCB(reg)                        movl    reg,CPUVAR(CURPCB)
                    132:
                    133: #define CLEAR_RESCHED(reg)             movl    reg,CPUVAR(RESCHED)
                    134:
                    135: /* XXX temporary kluge; these should not be here */
                    136: /* Get definitions for IOM_BEGIN, IOM_END, and IOM_SIZE */
                    137: #include <dev/isa/isareg.h>
                    138:
                    139:
                    140: /* Disallow old names for REALBASEMEM */
                    141: #ifdef BIOSBASEMEM
                    142: #error BIOSBASEMEM option deprecated; use REALBASEMEM only if memory size reported by latest boot block is incorrect
                    143: #endif
                    144:
                    145: /* Disallow old names for REALEXTMEM */
                    146: #ifdef EXTMEM_SIZE
                    147: #error EXTMEM_SIZE option deprecated; use REALEXTMEM only if memory size reported by latest boot block is incorrect
                    148: #endif
                    149: #ifdef BIOSEXTMEM
                    150: #error BIOSEXTMEM option deprecated; use REALEXTMEM only if memory size reported by latest boot block is incorrect
                    151: #endif
                    152:
                    153: #include <machine/frameasm.h>
                    154:
                    155:
                    156: #ifdef MULTIPROCESSOR
                    157: #include <machine/i82489reg.h>
                    158: #endif
                    159:
                    160: /*
                    161:  * PTmap is recursive pagemap at top of virtual address space.
                    162:  * Within PTmap, the page directory can be found (third indirection).
                    163:  *
                    164:  * XXX 4 == sizeof pde
                    165:  */
                    166:        .set    _C_LABEL(PTmap),(PDSLOT_PTE << PDSHIFT)
1.7       thorpej   167:        .set    _C_LABEL(PTD),(_C_LABEL(PTmap) + PDSLOT_PTE * PAGE_SIZE)
1.1       fvdl      168:        .set    _C_LABEL(PTDpde),(_C_LABEL(PTD) + PDSLOT_PTE * 4)
                    169:
                    170: /*
                    171:  * APTmap, APTD is the alternate recursive pagemap.
                    172:  * It's used when modifying another process's page tables.
                    173:  *
                    174:  * XXX 4 == sizeof pde
                    175:  */
                    176:        .set    _C_LABEL(APTmap),(PDSLOT_APTE << PDSHIFT)
1.7       thorpej   177:        .set    _C_LABEL(APTD),(_C_LABEL(APTmap) + PDSLOT_APTE * PAGE_SIZE)
1.1       fvdl      178:        .set    _C_LABEL(APTDpde),(_C_LABEL(PTD) + PDSLOT_APTE * 4)
                    179:
                    180:
                    181: /*
                    182:  * Initialization
                    183:  */
                    184:        .data
                    185:
                    186:        .globl  _C_LABEL(cpu)
                    187:        .globl  _C_LABEL(cpu_feature)
                    188:        .globl  _C_LABEL(esym),_C_LABEL(boothowto)
                    189:        .globl  _C_LABEL(bootinfo),_C_LABEL(atdevbase)
                    190: #ifdef COMPAT_OLDBOOT
                    191:        .globl  _C_LABEL(bootdev)
                    192: #endif
                    193:        .globl  _C_LABEL(proc0paddr),_C_LABEL(PTDpaddr)
                    194:        .globl  _C_LABEL(biosbasemem),_C_LABEL(biosextmem)
                    195:        .globl  _C_LABEL(gdt)
                    196: #ifdef I586_CPU
                    197:        .globl  _C_LABEL(idt)
                    198: #endif
                    199:        .globl  _C_LABEL(lapic_tpr)
                    200:
                    201: #if NLAPIC > 0
                    202: #ifdef __ELF__
1.7       thorpej   203:        .align  PAGE_SIZE
1.1       fvdl      204: #else
                    205:        .align  12
                    206: #endif
                    207:        .globl _C_LABEL(local_apic), _C_LABEL(lapic_id)
                    208: _C_LABEL(local_apic):
                    209:        .space  LAPIC_ID
                    210: _C_LABEL(lapic_id):
                    211:        .long   0x00000000
                    212:        .space  LAPIC_TPRI-(LAPIC_ID+4)
                    213: _C_LABEL(lapic_tpr):
                    214:        .space  LAPIC_PPRI-LAPIC_TPRI
                    215: _C_LABEL(lapic_ppr):
                    216:        .space  LAPIC_ISR-LAPIC_PPRI
                    217: _C_LABEL(lapic_isr):
1.7       thorpej   218:        .space  PAGE_SIZE-LAPIC_ISR
1.1       fvdl      219: #else
                    220: _C_LABEL(lapic_tpr):
                    221:        .long 0
                    222: #endif
                    223:
                    224:
                    225: _C_LABEL(cpu):         .long   0       # are we 386, 386sx, or 486,
                    226:                                        #   or Pentium, or..
                    227: _C_LABEL(cpu_feature): .long   0       # feature flags from 'cpuid'
                    228:                                        #   instruction
                    229: _C_LABEL(esym):                .long   0       # ptr to end of syms
                    230: _C_LABEL(atdevbase):   .long   0       # location of start of iomem in virtual
                    231: _C_LABEL(proc0paddr):  .long   0
                    232: _C_LABEL(PTDpaddr):    .long   0       # paddr of PTD, for libkvm
                    233: #ifndef REALBASEMEM
                    234: _C_LABEL(biosbasemem): .long   0       # base memory reported by BIOS
                    235: #else
                    236: _C_LABEL(biosbasemem): .long   REALBASEMEM
                    237: #endif
                    238: #ifndef REALEXTMEM
                    239: _C_LABEL(biosextmem):  .long   0       # extended memory reported by BIOS
                    240: #else
                    241: _C_LABEL(biosextmem):  .long   REALEXTMEM
                    242: #endif
                    243:
                    244:        .space 512
                    245: tmpstk:
                    246:
                    247:
                    248: #define        _RELOC(x)       ((x) - KERNBASE)
                    249: #define        RELOC(x)        _RELOC(_C_LABEL(x))
                    250:
                    251:        .text
                    252:        .globl  _C_LABEL(kernel_text)
                    253:        .set    _C_LABEL(kernel_text),KERNTEXTOFF
                    254:
                    255:        .globl  start
                    256: start: movw    $0x1234,0x472                   # warm boot
                    257:
                    258:        /*
                    259:         * Load parameters from stack
                    260:         * (howto, [bootdev], bootinfo, esym, basemem, extmem).
                    261:         */
                    262:        movl    4(%esp),%eax
                    263:        movl    %eax,RELOC(boothowto)
                    264: #ifdef COMPAT_OLDBOOT
                    265:        movl    8(%esp),%eax
                    266:        movl    %eax,RELOC(bootdev)
                    267: #endif
                    268:        movl    12(%esp),%eax
                    269:
                    270:        testl   %eax, %eax
                    271:        jz      1f
                    272:        movl    (%eax), %ebx            /* number of entries */
                    273:        movl    $RELOC(bootinfo), %edi
                    274:        movl    %ebx, (%edi)
                    275:        addl    $4, %edi
                    276: 2:
                    277:        testl   %ebx, %ebx
                    278:        jz      1f
                    279:        addl    $4, %eax
                    280:        movl    (%eax), %ecx            /* address of entry */
                    281:        pushl   %eax
                    282:        pushl   (%ecx)                  /* len */
                    283:        pushl   %ecx
                    284:        pushl   %edi
                    285:        addl    (%ecx), %edi            /* update dest pointer */
                    286:        cmpl    $_RELOC(_C_LABEL(bootinfo) + BOOTINFO_MAXSIZE), %edi
                    287:        jg      2f
                    288:        call    _C_LABEL(memcpy)
                    289:        addl    $12, %esp
                    290:        popl    %eax
                    291:        subl    $1, %ebx
                    292:        jmp     2b
                    293: 2:     /* cleanup for overflow case */
                    294:        addl    $16, %esp
                    295:        movl    $RELOC(bootinfo), %edi
                    296:        subl    %ebx, (%edi)            /* correct number of entries */
                    297: 1:
                    298:
                    299:        movl    16(%esp),%eax
                    300:        testl   %eax,%eax
                    301:        jz      1f
                    302:        addl    $KERNBASE,%eax
                    303: 1:     movl    %eax,RELOC(esym)
                    304:
                    305:        movl    RELOC(biosextmem),%eax
                    306:        testl   %eax,%eax
                    307:        jnz     1f
                    308:        movl    20(%esp),%eax
                    309:        movl    %eax,RELOC(biosextmem)
                    310: 1:
                    311:        movl    RELOC(biosbasemem),%eax
                    312:        testl   %eax,%eax
                    313:        jnz     1f
                    314:        movl    24(%esp),%eax
                    315:        movl    %eax,RELOC(biosbasemem)
                    316: 1:
                    317:
                    318:        /* First, reset the PSL. */
                    319:        pushl   $PSL_MBO
                    320:        popfl
                    321:
                    322:        /* Clear segment registers; always null in proc0. */
                    323:        xorl    %eax,%eax
                    324:        movw    %ax,%fs
                    325:        movw    %ax,%gs
                    326:        decl    %eax
                    327:        movl    %eax,RELOC(cpu_info_primary)+CPU_INFO_LEVEL
                    328:
                    329:        /* Find out our CPU type. */
                    330:
                    331: try386:        /* Try to toggle alignment check flag; does not exist on 386. */
                    332:        pushfl
                    333:        popl    %eax
                    334:        movl    %eax,%ecx
                    335:        orl     $PSL_AC,%eax
                    336:        pushl   %eax
                    337:        popfl
                    338:        pushfl
                    339:        popl    %eax
                    340:        xorl    %ecx,%eax
                    341:        andl    $PSL_AC,%eax
                    342:        pushl   %ecx
                    343:        popfl
                    344:
                    345:        testl   %eax,%eax
                    346:        jnz     try486
                    347:
                    348:        /*
                    349:         * Try the test of a NexGen CPU -- ZF will not change on a DIV
                    350:         * instruction on a NexGen, it will on an i386.  Documented in
                    351:         * Nx586 Processor Recognition Application Note, NexGen, Inc.
                    352:         */
                    353:        movl    $0x5555,%eax
                    354:        xorl    %edx,%edx
                    355:        movl    $2,%ecx
                    356:        divl    %ecx
                    357:        jnz     is386
                    358:
                    359: isnx586:
                    360:        /*
                    361:         * Don't try cpuid, as Nx586s reportedly don't support the
                    362:         * PSL_ID bit.
                    363:         */
                    364:        movl    $CPU_NX586,RELOC(cpu)
                    365:        jmp     2f
                    366:
                    367: is386:
                    368:        movl    $CPU_386,RELOC(cpu)
                    369:        jmp     2f
                    370:
                    371: try486:        /* Try to toggle identification flag; does not exist on early 486s. */
                    372:        pushfl
                    373:        popl    %eax
                    374:        movl    %eax,%ecx
                    375:        xorl    $PSL_ID,%eax
                    376:        pushl   %eax
                    377:        popfl
                    378:        pushfl
                    379:        popl    %eax
                    380:        xorl    %ecx,%eax
                    381:        andl    $PSL_ID,%eax
                    382:        pushl   %ecx
                    383:        popfl
                    384:
                    385:        testl   %eax,%eax
                    386:        jnz     try586
                    387: is486: movl    $CPU_486,RELOC(cpu)
                    388:        /*
                    389:         * Check Cyrix CPU
                    390:         * Cyrix CPUs do not change the undefined flags following
                    391:         * execution of the divide instruction which divides 5 by 2.
                    392:         *
                    393:         * Note: CPUID is enabled on M2, so it passes another way.
                    394:         */
                    395:        pushfl
                    396:        movl    $0x5555, %eax
                    397:        xorl    %edx, %edx
                    398:        movl    $2, %ecx
                    399:        clc
                    400:        divl    %ecx
                    401:        jnc     trycyrix486
                    402:        popfl
                    403:        jmp 2f
                    404: trycyrix486:
                    405:        movl    $CPU_6x86,RELOC(cpu)    # set CPU type
                    406:        /*
                    407:         * Check for Cyrix 486 CPU by seeing if the flags change during a
                    408:         * divide. This is documented in the Cx486SLC/e SMM Programmer's
                    409:         * Guide.
                    410:         */
                    411:        xorl    %edx,%edx
                    412:        cmpl    %edx,%edx               # set flags to known state
                    413:        pushfl
                    414:        popl    %ecx                    # store flags in ecx
                    415:        movl    $-1,%eax
                    416:        movl    $4,%ebx
                    417:        divl    %ebx                    # do a long division
                    418:        pushfl
                    419:        popl    %eax
                    420:        xorl    %ecx,%eax               # are the flags different?
                    421:        testl   $0x8d5,%eax             # only check C|PF|AF|Z|N|V
                    422:        jne     2f                      # yes; must be Cyrix 6x86 CPU
                    423:        movl    $CPU_486DLC,RELOC(cpu)  # set CPU type
                    424:
                    425: #ifndef CYRIX_CACHE_WORKS
                    426:        /* Disable caching of the ISA hole only. */
                    427:        invd
                    428:        movb    $CCR0,%al               # Configuration Register index (CCR0)
                    429:        outb    %al,$0x22
                    430:        inb     $0x23,%al
                    431:        orb     $(CCR0_NC1|CCR0_BARB),%al
                    432:        movb    %al,%ah
                    433:        movb    $CCR0,%al
                    434:        outb    %al,$0x22
                    435:        movb    %ah,%al
                    436:        outb    %al,$0x23
                    437:        invd
                    438: #else /* CYRIX_CACHE_WORKS */
                    439:        /* Set cache parameters */
                    440:        invd                            # Start with guaranteed clean cache
                    441:        movb    $CCR0,%al               # Configuration Register index (CCR0)
                    442:        outb    %al,$0x22
                    443:        inb     $0x23,%al
                    444:        andb    $~CCR0_NC0,%al
                    445: #ifndef CYRIX_CACHE_REALLY_WORKS
                    446:        orb     $(CCR0_NC1|CCR0_BARB),%al
                    447: #else
                    448:        orb     $CCR0_NC1,%al
                    449: #endif
                    450:        movb    %al,%ah
                    451:        movb    $CCR0,%al
                    452:        outb    %al,$0x22
                    453:        movb    %ah,%al
                    454:        outb    %al,$0x23
                    455:        /* clear non-cacheable region 1 */
                    456:        movb    $(NCR1+2),%al
                    457:        outb    %al,$0x22
                    458:        movb    $NCR_SIZE_0K,%al
                    459:        outb    %al,$0x23
                    460:        /* clear non-cacheable region 2 */
                    461:        movb    $(NCR2+2),%al
                    462:        outb    %al,$0x22
                    463:        movb    $NCR_SIZE_0K,%al
                    464:        outb    %al,$0x23
                    465:        /* clear non-cacheable region 3 */
                    466:        movb    $(NCR3+2),%al
                    467:        outb    %al,$0x22
                    468:        movb    $NCR_SIZE_0K,%al
                    469:        outb    %al,$0x23
                    470:        /* clear non-cacheable region 4 */
                    471:        movb    $(NCR4+2),%al
                    472:        outb    %al,$0x22
                    473:        movb    $NCR_SIZE_0K,%al
                    474:        outb    %al,$0x23
                    475:        /* enable caching in CR0 */
                    476:        movl    %cr0,%eax
                    477:        andl    $~(CR0_CD|CR0_NW),%eax
                    478:        movl    %eax,%cr0
                    479:        invd
                    480: #endif /* CYRIX_CACHE_WORKS */
                    481:
                    482:        jmp     2f
                    483:
                    484: try586:        /* Use the `cpuid' instruction. */
                    485:        xorl    %eax,%eax
                    486:        cpuid
                    487:        movl    %eax,RELOC(cpu_info_primary)+CPU_INFO_LEVEL
                    488:
                    489: 2:
                    490:        /*
                    491:         * Finished with old stack; load new %esp now instead of later so we
                    492:         * can trace this code without having to worry about the trace trap
                    493:         * clobbering the memory test or the zeroing of the bss+bootstrap page
                    494:         * tables.
                    495:         *
                    496:         * The boot program should check:
                    497:         *      text+data <= &stack_variable - more_space_for_stack
                    498:         *      text+data+bss+pad+space_for_page_tables <= end_of_memory
                    499:         * Oops, the gdt is in the carcass of the boot program so clearing
                    500:         * the rest of memory is still not possible.
                    501:         */
                    502:        movl    $_RELOC(tmpstk),%esp    # bootstrap stack end location
                    503:
                    504: /*
                    505:  * Virtual address space of kernel:
                    506:  *
                    507:  * text | data | bss | [syms] | page dir | proc0 kstack
                    508:  *                           0          1       2      3
                    509:  */
1.7       thorpej   510: #define        PROC0PDIR       ((0)              * PAGE_SIZE)
                    511: #define        PROC0STACK      ((1)              * PAGE_SIZE)
                    512: #define        SYSMAP          ((1+UPAGES)       * PAGE_SIZE)
                    513: #define        TABLESIZE       ((1+UPAGES) * PAGE_SIZE) /* + nkpde * PAGE_SIZE */
1.1       fvdl      514:
                    515:        /* Find end of kernel image. */
                    516:        movl    $RELOC(end),%edi
1.8     ! fvdl      517: #if (NKSYMS || defined(DDB) || defined(LKM)) && !defined(SYMTAB_SPACE)
1.1       fvdl      518:        /* Save the symbols (if loaded). */
                    519:        movl    RELOC(esym),%eax
                    520:        testl   %eax,%eax
                    521:        jz      1f
                    522:        subl    $KERNBASE,%eax
                    523:        movl    %eax,%edi
                    524: 1:
                    525: #endif
                    526:
                    527:        /* Calculate where to start the bootstrap tables. */
                    528:        movl    %edi,%esi                       # edi = esym ? esym : end
                    529:        addl    $PGOFSET,%esi                   # page align up
                    530:        andl    $~PGOFSET,%esi
                    531:
                    532:        /*
                    533:         * Calculate the size of the kernel page table directory, and
                    534:         * how many entries it will have.
                    535:         */
                    536:        movl    RELOC(nkpde),%ecx               # get nkpde
                    537:        cmpl    $NKPTP_MIN,%ecx                 # larger than min?
                    538:        jge     1f
                    539:        movl    $NKPTP_MIN,%ecx                 # set at min
                    540:        jmp     2f
                    541: 1:     cmpl    $NKPTP_MAX,%ecx                 # larger than max?
                    542:        jle     2f
                    543:        movl    $NKPTP_MAX,%ecx
                    544: 2:
                    545:
                    546:        /* Clear memory for bootstrap tables. */
                    547:        shll    $PGSHIFT,%ecx
                    548:        addl    $TABLESIZE,%ecx
                    549:        addl    %esi,%ecx                       # end of tables
                    550:        subl    %edi,%ecx                       # size of tables
                    551:        shrl    $2,%ecx
                    552:        xorl    %eax,%eax
                    553:        cld
                    554:        rep
                    555:        stosl
                    556:
                    557: /*
                    558:  * fillkpt
                    559:  *     eax = pte (page frame | control | status)
                    560:  *     ebx = page table address
                    561:  *     ecx = number of pages to map
                    562:  */
                    563: #define        fillkpt         \
                    564: 1:     movl    %eax,(%ebx)     ; \
1.7       thorpej   565:        addl    $PAGE_SIZE,%eax ; /* increment physical address */ \
1.1       fvdl      566:        addl    $4,%ebx         ; /* next pte */ \
                    567:        loop    1b              ;
                    568:
                    569: /*
                    570:  * Build initial page tables.
                    571:  */
                    572:        /* Calculate end of text segment, rounded to a page. */
                    573:        leal    (RELOC(etext)+PGOFSET),%edx
                    574:        andl    $~PGOFSET,%edx
                    575:
                    576:        /* Skip over the first 1MB. */
                    577:        movl    $_RELOC(KERNTEXTOFF),%eax
                    578:        movl    %eax,%ecx
                    579:        shrl    $PGSHIFT,%ecx
                    580:        leal    (SYSMAP)(%esi,%ecx,4),%ebx
                    581:
                    582:        /* Map the kernel text read-only. */
                    583:        movl    %edx,%ecx
                    584:        subl    %eax,%ecx
                    585:        shrl    $PGSHIFT,%ecx
                    586:        orl     $(PG_V|PG_KR),%eax
                    587:        fillkpt
                    588:
                    589:        /* Map the data, BSS, and bootstrap tables read-write. */
                    590:        leal    (PG_V|PG_KW)(%edx),%eax
                    591:        movl    RELOC(nkpde),%ecx
                    592:        shll    $PGSHIFT,%ecx
                    593:        addl    $TABLESIZE,%ecx
                    594:        addl    %esi,%ecx                               # end of tables
                    595:        subl    %edx,%ecx                               # subtract end of text
                    596:        shrl    $PGSHIFT,%ecx
                    597:        fillkpt
                    598:
                    599:        /* Map ISA I/O memory. */
                    600:        movl    $(IOM_BEGIN|PG_V|PG_KW/*|PG_N*/),%eax   # having these bits set
                    601:        movl    $(IOM_SIZE>>PGSHIFT),%ecx               # for this many pte s,
                    602:        fillkpt
                    603:
                    604: /*
                    605:  * Construct a page table directory.
                    606:  */
                    607:        /* Install PDEs for temporary double map of kernel. */
                    608:        movl    RELOC(nkpde),%ecx                       # for this many pde s,
                    609:        leal    (PROC0PDIR+0*4)(%esi),%ebx              # which is where temp maps!
                    610:        leal    (SYSMAP+PG_V|PG_KW)(%esi),%eax          # pte for KPT in proc 0,
                    611:        fillkpt
                    612:
                    613:        /* Map kernel PDEs. */
                    614:        movl    RELOC(nkpde),%ecx                       # for this many pde s,
                    615:        leal    (PROC0PDIR+PDSLOT_KERN*4)(%esi),%ebx    # kernel pde offset
                    616:        leal    (SYSMAP+PG_V|PG_KW)(%esi),%eax          # pte for KPT in proc 0,
                    617:        fillkpt
                    618:
                    619:        /* Install a PDE recursively mapping page directory as a page table! */
                    620:        leal    (PROC0PDIR+PG_V|PG_KW)(%esi),%eax       # pte for ptd
                    621:        movl    %eax,(PROC0PDIR+PDSLOT_PTE*4)(%esi)     # recursive PD slot
                    622:
                    623:        /* Save phys. addr of PTD, for libkvm. */
                    624:        movl    %esi,RELOC(PTDpaddr)
                    625:
                    626:        /* Load base of page directory and enable mapping. */
                    627:        movl    %esi,%eax               # phys address of ptd in proc 0
                    628:        movl    %eax,%cr3               # load ptd addr into mmu
                    629:        movl    %cr0,%eax               # get control word
                    630:                                        # enable paging & NPX emulation
                    631:        orl     $(CR0_PE|CR0_PG|CR0_NE|CR0_TS|CR0_EM|CR0_MP),%eax
                    632:        movl    %eax,%cr0               # and let's page NOW!
                    633:
                    634:        pushl   $begin                  # jump to high mem
                    635:        ret
                    636:
                    637: begin:
                    638:        /* Now running relocated at KERNBASE.  Remove double mapping. */
                    639:        movl    _C_LABEL(nkpde),%ecx            # for this many pde s,
                    640:        leal    (PROC0PDIR+0*4)(%esi),%ebx      # which is where temp maps!
                    641:        addl    $(KERNBASE), %ebx       # now use relocated address
                    642: 1:     movl    $0,(%ebx)
                    643:        addl    $4,%ebx # next pde
                    644:        loop    1b
                    645:
                    646:        /* Relocate atdevbase. */
                    647:        movl    _C_LABEL(nkpde),%edx
                    648:        shll    $PGSHIFT,%edx
                    649:        addl    $(TABLESIZE+KERNBASE),%edx
                    650:        addl    %esi,%edx
                    651:        movl    %edx,_C_LABEL(atdevbase)
                    652:
                    653:        /* Set up bootstrap stack. */
                    654:        leal    (PROC0STACK+KERNBASE)(%esi),%eax
                    655:        movl    %eax,_C_LABEL(proc0paddr)
                    656:        leal    (USPACE-FRAMESIZE)(%eax),%esp
                    657:        movl    %esi,PCB_CR3(%eax)      # pcb->pcb_cr3
                    658:        xorl    %ebp,%ebp               # mark end of frames
                    659:
                    660:        subl    $NGDT*8, %esp           # space for temporary gdt
                    661:        pushl   %esp
                    662:        call    _C_LABEL(initgdt)
                    663:        addl    $4,%esp
                    664:
                    665:        movl    _C_LABEL(nkpde),%eax
                    666:        shll    $PGSHIFT,%eax
                    667:        addl    $TABLESIZE,%eax
                    668:        addl    %esi,%eax               # skip past stack and page tables
                    669:
                    670:        pushl   %eax
                    671:        call    _C_LABEL(init386)       # wire 386 chip for unix operation
                    672:        addl    $4+NGDT*8,%esp          # pop temporary gdt
                    673:
                    674: #ifdef SAFARI_FIFO_HACK
                    675:        movb    $5,%al
                    676:        movw    $0x37b,%dx
                    677:        outb    %al,%dx
                    678:        movw    $0x37f,%dx
                    679:        inb     %dx,%al
                    680:        movb    %al,%cl
                    681:
                    682:        orb     $1,%cl
                    683:
                    684:        movb    $5,%al
                    685:        movw    $0x37b,%dx
                    686:        outb    %al,%dx
                    687:        movw    $0x37f,%dx
                    688:        movb    %cl,%al
                    689:        outb    %al,%dx
                    690: #endif /* SAFARI_FIFO_HACK */
                    691:
                    692:        call    _C_LABEL(main)
                    693:
                    694: /*
                    695:  * void proc_trampoline(void);
                    696:  * This is a trampoline function pushed onto the stack of a newly created
                    697:  * process in order to do some additional setup.  The trampoline is entered by
                    698:  * cpu_switch()ing to the process, so we abuse the callee-saved registers used
                    699:  * by cpu_switch() to store the information about the stub to call.
                    700:  * NOTE: This function does not have a normal calling sequence!
                    701:  */
                    702: /* LINTSTUB: Func: void proc_trampoline(void) */
                    703: NENTRY(proc_trampoline)
                    704: #ifdef MULTIPROCESSOR
                    705:        call    _C_LABEL(proc_trampoline_mp)
                    706: #endif
                    707:        movl    $IPL_NONE,CPUVAR(ILEVEL)
                    708:        pushl   %ebx
                    709:        call    *%esi
                    710:        addl    $4,%esp
                    711:        INTRFASTEXIT
                    712:        /* NOTREACHED */
                    713:
                    714: /*****************************************************************************/
                    715:
                    716: /*
                    717:  * Signal trampoline; copied to top of user stack.
                    718:  */
                    719: /* LINTSTUB: Var: char sigcode[1], esigcode[1]; */
                    720: NENTRY(sigcode)
                    721:        /*
                    722:         * Handler has returned here as if we called it.  The sigcontext
                    723:         * is on the stack after the 3 args "we" pushed.
                    724:         */
                    725:        leal    12(%esp),%eax           # get pointer to sigcontext
                    726:        movl    %eax,4(%esp)            # put it in the argument slot
                    727:                                        # fake return address already there
                    728:        movl    $SYS___sigreturn14,%eax
                    729:        int     $0x80                   # enter kernel with args on stack
                    730:        movl    $SYS_exit,%eax
                    731:        int     $0x80                   # exit if sigreturn fails
                    732:        .globl  _C_LABEL(esigcode)
                    733: _C_LABEL(esigcode):
                    734:
                    735: /*****************************************************************************/
                    736:
                    737: /*
                    738:  * The following primitives are used to fill and copy regions of memory.
                    739:  */
                    740:
                    741: /*
                    742:  * XXX No section 9 man page for fillw.
                    743:  * fillw seems to be very sparsely used (only in pccons it seems.)
                    744:  * One wonders if it couldn't be done without.
                    745:  * -- Perry Metzger, May 7, 2001
                    746:  */
                    747: /*
                    748:  * void fillw(short pattern, void *addr, size_t len);
                    749:  * Write len copies of pattern at addr.
                    750:  */
                    751: /* LINTSTUB: Func: void fillw(short pattern, void *addr, size_t len) */
                    752: ENTRY(fillw)
                    753:        pushl   %edi
                    754:        movl    8(%esp),%eax
                    755:        movl    12(%esp),%edi
                    756:        movw    %ax,%cx
                    757:        rorl    $16,%eax
                    758:        movw    %cx,%ax
                    759:        cld
                    760:        movl    16(%esp),%ecx
                    761:        shrl    %ecx                    # do longwords
                    762:        rep
                    763:        stosl
                    764:        movl    16(%esp),%ecx
                    765:        andl    $1,%ecx                 # do remainder
                    766:        rep
                    767:        stosw
                    768:        popl    %edi
                    769:        ret
                    770:
                    771: /*
                    772:  * int kcopy(const void *from, void *to, size_t len);
                    773:  * Copy len bytes, abort on fault.
                    774:  */
                    775: /* LINTSTUB: Func: int kcopy(const void *from, void *to, size_t len) */
                    776: ENTRY(kcopy)
                    777:        pushl   %esi
                    778:        pushl   %edi
                    779:        GET_CURPCB(%eax)                # load curpcb into eax and set on-fault
                    780:        pushl   PCB_ONFAULT(%eax)
                    781:        movl    $_C_LABEL(copy_fault), PCB_ONFAULT(%eax)
                    782:
                    783:        movl    16(%esp),%esi
                    784:        movl    20(%esp),%edi
                    785:        movl    24(%esp),%ecx
                    786:        movl    %edi,%eax
                    787:        subl    %esi,%eax
                    788:        cmpl    %ecx,%eax               # overlapping?
                    789:        jb      1f
                    790:        cld                             # nope, copy forward
                    791:        shrl    $2,%ecx                 # copy by 32-bit words
                    792:        rep
                    793:        movsl
                    794:        movl    24(%esp),%ecx
                    795:        andl    $3,%ecx                 # any bytes left?
                    796:        rep
                    797:        movsb
                    798:
                    799:        GET_CURPCB(%edx)                # XXX save curpcb?
                    800:        popl    PCB_ONFAULT(%edx)
                    801:        popl    %edi
                    802:        popl    %esi
                    803:        xorl    %eax,%eax
                    804:        ret
                    805:
                    806:        ALIGN_TEXT
                    807: 1:     addl    %ecx,%edi               # copy backward
                    808:        addl    %ecx,%esi
                    809:        std
                    810:        andl    $3,%ecx                 # any fractional bytes?
                    811:        decl    %edi
                    812:        decl    %esi
                    813:        rep
                    814:        movsb
                    815:        movl    24(%esp),%ecx           # copy remainder by 32-bit words
                    816:        shrl    $2,%ecx
                    817:        subl    $3,%esi
                    818:        subl    $3,%edi
                    819:        rep
                    820:        movsl
                    821:        cld
                    822:
                    823:        GET_CURPCB(%edx)
                    824:        popl    PCB_ONFAULT(%edx)
                    825:        popl    %edi
                    826:        popl    %esi
                    827:        xorl    %eax,%eax
                    828:        ret
                    829:
                    830: /*****************************************************************************/
                    831:
                    832: /*
                    833:  * The following primitives are used to copy data in and out of the user's
                    834:  * address space.
                    835:  */
                    836:
                    837: /*
                    838:  * Default to the lowest-common-denominator.  We will improve it
                    839:  * later.
                    840:  */
                    841: #if defined(I386_CPU)
                    842: #define        DEFAULT_COPYOUT         _C_LABEL(i386_copyout)
                    843: #define        DEFAULT_COPYIN          _C_LABEL(i386_copyin)
                    844: #elif defined(I486_CPU)
                    845: #define        DEFAULT_COPYOUT         _C_LABEL(i486_copyout)
                    846: #define        DEFAULT_COPYIN          _C_LABEL(i386_copyin)
                    847: #elif defined(I586_CPU)
                    848: #define        DEFAULT_COPYOUT         _C_LABEL(i486_copyout)  /* XXX */
                    849: #define        DEFAULT_COPYIN          _C_LABEL(i386_copyin)   /* XXX */
                    850: #elif defined(I686_CPU)
                    851: #define        DEFAULT_COPYOUT         _C_LABEL(i486_copyout)  /* XXX */
                    852: #define        DEFAULT_COPYIN          _C_LABEL(i386_copyin)   /* XXX */
                    853: #endif
                    854:
                    855:        .data
                    856:
                    857:        .globl  _C_LABEL(copyout_func)
                    858: _C_LABEL(copyout_func):
                    859:        .long   DEFAULT_COPYOUT
                    860:
                    861:        .globl  _C_LABEL(copyin_func)
                    862: _C_LABEL(copyin_func):
                    863:        .long   DEFAULT_COPYIN
                    864:
                    865:        .text
                    866:
                    867: /*
                    868:  * int copyout(const void *from, void *to, size_t len);
                    869:  * Copy len bytes into the user's address space.
                    870:  * see copyout(9)
                    871:  */
                    872: /* LINTSTUB: Func: int copyout(const void *kaddr, void *uaddr, size_t len) */
                    873: ENTRY(copyout)
                    874:        jmp     *_C_LABEL(copyout_func)
                    875:
                    876: #if defined(I386_CPU)
                    877: /* LINTSTUB: Func: int i386_copyout(const void *kaddr, void *uaddr, size_t len) */
                    878: ENTRY(i386_copyout)
                    879:        pushl   %esi
                    880:        pushl   %edi
                    881:        pushl   $0
                    882:
                    883:        movl    16(%esp),%esi
                    884:        movl    20(%esp),%edi
                    885:        movl    24(%esp),%eax
                    886:
                    887:        /*
                    888:         * We check that the end of the destination buffer is not past the end
                    889:         * of the user's address space.  If it's not, then we only need to
                    890:         * check that each page is writable.  The 486 will do this for us; the
                    891:         * 386 will not.  (We assume that pages in user space that are not
                    892:         * writable by the user are not writable by the kernel either.)
                    893:         */
                    894:        movl    %edi,%edx
                    895:        addl    %eax,%edx
                    896:        jc      _C_LABEL(copy_efault)
                    897:        cmpl    $VM_MAXUSER_ADDRESS,%edx
                    898:        ja      _C_LABEL(copy_efault)
                    899:
                    900:        testl   %eax,%eax               # anything to do?
                    901:        jz      3f
                    902:
                    903:        /*
                    904:         * We have to check each PTE for (write) permission, since the CPU
                    905:         * doesn't do it for us.
                    906:         */
                    907:
                    908:        /* Compute number of pages. */
                    909:        movl    %edi,%ecx
                    910:        andl    $PGOFSET,%ecx
                    911:        addl    %eax,%ecx
                    912:        decl    %ecx
                    913:        shrl    $PGSHIFT,%ecx
                    914:
                    915:        /* Compute PTE offset for start address. */
                    916:        shrl    $PGSHIFT,%edi
                    917:
                    918:        GET_CURPCB(%edx)
                    919:        movl    $2f,PCB_ONFAULT(%edx)
                    920:
                    921: 1:     /* Check PTE for each page. */
                    922:        testb   $PG_RW,_C_LABEL(PTmap)(,%edi,4)
                    923:        jz      2f
                    924:
                    925: 4:     incl    %edi
                    926:        decl    %ecx
                    927:        jns     1b
                    928:
                    929:        movl    20(%esp),%edi
                    930:        movl    24(%esp),%eax
                    931:        jmp     3f
                    932:
                    933: 2:     /* Simulate a trap. */
                    934:        pushl   %ecx
                    935:        movl    %edi,%eax
                    936:        shll    $PGSHIFT,%eax
                    937:        pushl   %eax
                    938:        call    _C_LABEL(trapwrite)     # trapwrite(addr)
                    939:        addl    $4,%esp                 # pop argument
                    940:        popl    %ecx
                    941:        testl   %eax,%eax               # if not ok, return EFAULT
                    942:        jz      4b
                    943:        jmp     _C_LABEL(copy_efault)
                    944:
                    945: 3:     GET_CURPCB(%edx)
                    946:        movl    $_C_LABEL(copy_fault),PCB_ONFAULT(%edx)
                    947:
                    948:        /* bcopy(%esi, %edi, %eax); */
                    949:        cld
                    950:        movl    %eax,%ecx
                    951:        shrl    $2,%ecx
                    952:        rep
                    953:        movsl
                    954:        movl    %eax,%ecx
                    955:        andl    $3,%ecx
                    956:        rep
                    957:        movsb
                    958:
                    959:        popl    PCB_ONFAULT(%edx)
                    960:        popl    %edi
                    961:        popl    %esi
                    962:        xorl    %eax,%eax
                    963:        ret
                    964: #endif /* I386_CPU */
                    965:
                    966: #if defined(I486_CPU) || defined(I586_CPU) || defined(I686_CPU)
                    967: /* LINTSTUB: Func: int i486_copyout(const void *kaddr, void *uaddr, size_t len) */
                    968: ENTRY(i486_copyout)
                    969:        pushl   %esi
                    970:        pushl   %edi
                    971:        pushl   $0
                    972:
                    973:        movl    16(%esp),%esi
                    974:        movl    20(%esp),%edi
                    975:        movl    24(%esp),%eax
                    976:
                    977:        /*
                    978:         * We check that the end of the destination buffer is not past the end
                    979:         * of the user's address space.
                    980:         */
                    981:        movl    %edi,%edx
                    982:        addl    %eax,%edx
                    983:        jc      _C_LABEL(copy_efault)
                    984:        cmpl    $VM_MAXUSER_ADDRESS,%edx
                    985:        ja      _C_LABEL(copy_efault)
                    986:
                    987:        GET_CURPCB(%edx)
                    988:        movl    $_C_LABEL(copy_fault),PCB_ONFAULT(%edx)
                    989:
                    990:        /* bcopy(%esi, %edi, %eax); */
                    991:        cld
                    992:        movl    %eax,%ecx
                    993:        shrl    $2,%ecx
                    994:        rep
                    995:        movsl
                    996:        movl    %eax,%ecx
                    997:        andl    $3,%ecx
                    998:        rep
                    999:        movsb
                   1000:
                   1001:        popl    PCB_ONFAULT(%edx)
                   1002:        popl    %edi
                   1003:        popl    %esi
                   1004:        xorl    %eax,%eax
                   1005:        ret
                   1006: #endif /* I486_CPU || I586_CPU || I686_CPU */
                   1007:
                   1008: /*
                   1009:  * int copyin(const void *from, void *to, size_t len);
                   1010:  * Copy len bytes from the user's address space.
                   1011:  * see copyin(9)
                   1012:  */
                   1013: /* LINTSTUB: Func: int copyin(const void *uaddr, void *kaddr, size_t len) */
                   1014: ENTRY(copyin)
                   1015:        jmp     *_C_LABEL(copyin_func)
                   1016:
                   1017: #if defined(I386_CPU) || defined(I486_CPU) || defined(I586_CPU) || \
                   1018:     defined(I686_CPU)
                   1019: /* LINTSTUB: Func: int i386_copyin(const void *uaddr, void *kaddr, size_t len) */
                   1020: ENTRY(i386_copyin)
                   1021:        pushl   %esi
                   1022:        pushl   %edi
                   1023:        GET_CURPCB(%eax)
                   1024:        pushl   $0
                   1025:        movl    $_C_LABEL(copy_fault),PCB_ONFAULT(%eax)
                   1026:
                   1027:        movl    16(%esp),%esi
                   1028:        movl    20(%esp),%edi
                   1029:        movl    24(%esp),%eax
                   1030:
                   1031:        /*
                   1032:         * We check that the end of the destination buffer is not past the end
                   1033:         * of the user's address space.  If it's not, then we only need to
                   1034:         * check that each page is readable, and the CPU will do that for us.
                   1035:         */
                   1036:        movl    %esi,%edx
                   1037:        addl    %eax,%edx
                   1038:        jc      _C_LABEL(copy_efault)
                   1039:        cmpl    $VM_MAXUSER_ADDRESS,%edx
                   1040:        ja      _C_LABEL(copy_efault)
                   1041:
                   1042:        /* bcopy(%esi, %edi, %eax); */
                   1043:        cld
                   1044:        movl    %eax,%ecx
                   1045:        shrl    $2,%ecx
                   1046:        rep
                   1047:        movsl
                   1048:        movl    %eax,%ecx
                   1049:        andl    $3,%ecx
                   1050:        rep
                   1051:        movsb
                   1052:
                   1053:        GET_CURPCB(%edx)
                   1054:        popl    PCB_ONFAULT(%edx)
                   1055:        popl    %edi
                   1056:        popl    %esi
                   1057:        xorl    %eax,%eax
                   1058:        ret
                   1059: #endif /* I386_CPU || I486_CPU || I586_CPU || I686_CPU */
                   1060:
                   1061: /* LINTSTUB: Ignore */
                   1062: NENTRY(copy_efault)
                   1063:        movl    $EFAULT,%eax
                   1064:
                   1065: /* LINTSTUB: Ignore */
                   1066: NENTRY(copy_fault)
                   1067:        GET_CURPCB(%edx)
                   1068:        popl    PCB_ONFAULT(%edx)
                   1069:        popl    %edi
                   1070:        popl    %esi
                   1071:        ret
                   1072:
                   1073: /*
                   1074:  * int copyoutstr(const void *from, void *to, size_t maxlen, size_t *lencopied);
                   1075:  * Copy a NUL-terminated string, at most maxlen characters long, into the
                   1076:  * user's address space.  Return the number of characters copied (including the
                   1077:  * NUL) in *lencopied.  If the string is too long, return ENAMETOOLONG; else
                   1078:  * return 0 or EFAULT.
                   1079:  * see copyoutstr(9)
                   1080:  */
                   1081: /* LINTSTUB: Func: int copyoutstr(const void *kaddr, void *uaddr, size_t len, size_t *done) */
                   1082: ENTRY(copyoutstr)
                   1083:        pushl   %esi
                   1084:        pushl   %edi
                   1085:
                   1086:        movl    12(%esp),%esi           # esi = from
                   1087:        movl    16(%esp),%edi           # edi = to
                   1088:        movl    20(%esp),%edx           # edx = maxlen
                   1089:
                   1090: #if defined(I386_CPU)
                   1091: #if defined(I486_CPU) || defined(I586_CPU) || defined(I686_CPU)
                   1092:        cmpl    $CPUCLASS_386,_C_LABEL(cpu_class)
                   1093:        jne     5f
                   1094: #endif /* I486_CPU || I586_CPU || I686_CPU */
                   1095:
                   1096:        /* Compute number of bytes in first page. */
                   1097:        movl    %edi,%eax
                   1098:        andl    $PGOFSET,%eax
1.7       thorpej  1099:        movl    $PAGE_SIZE,%ecx
                   1100:        subl    %eax,%ecx               # ecx = PAGE_SIZE - (src % PAGE_SIZE)
1.1       fvdl     1101:
                   1102:        GET_CURPCB(%eax)
                   1103:        movl    $6f,PCB_ONFAULT(%eax)
                   1104:
                   1105: 1:     /*
                   1106:         * Once per page, check that we are still within the bounds of user
                   1107:         * space, and check for a write fault.
                   1108:         */
                   1109:        cmpl    $VM_MAXUSER_ADDRESS,%edi
                   1110:        jae     _C_LABEL(copystr_efault)
                   1111:
                   1112:        /* Compute PTE offset. */
                   1113:        movl    %edi,%eax
                   1114:        shrl    $PGSHIFT,%eax           # calculate pte address
                   1115:
                   1116:        testb   $PG_RW,_C_LABEL(PTmap)(,%eax,4)
                   1117:        jnz     2f
                   1118:
                   1119: 6:     /* Simulate a trap. */
                   1120:        pushl   %edx
                   1121:        pushl   %edi
                   1122:        call    _C_LABEL(trapwrite)     # trapwrite(addr)
                   1123:        addl    $4,%esp                 # clear argument from stack
                   1124:        popl    %edx
                   1125:        testl   %eax,%eax
                   1126:        jnz     _C_LABEL(copystr_efault)
                   1127:
                   1128: 2:     /* Copy up to end of this page. */
                   1129:        subl    %ecx,%edx               # predecrement total count
                   1130:        jnc     3f
                   1131:        addl    %edx,%ecx               # ecx += (edx - ecx) = edx
                   1132:        xorl    %edx,%edx
                   1133:
                   1134: 3:     decl    %ecx
                   1135:        js      4f
                   1136:        lodsb
                   1137:        stosb
                   1138:        testb   %al,%al
                   1139:        jnz     3b
                   1140:
                   1141:        /* Success -- 0 byte reached. */
                   1142:        addl    %ecx,%edx               # add back residual for this page
                   1143:        xorl    %eax,%eax
                   1144:        jmp     copystr_return
                   1145:
                   1146: 4:     /* Go to next page, if any. */
1.7       thorpej  1147:        movl    $PAGE_SIZE,%ecx
1.1       fvdl     1148:        testl   %edx,%edx
                   1149:        jnz     1b
                   1150:
                   1151:        /* edx is zero -- return ENAMETOOLONG. */
                   1152:        movl    $ENAMETOOLONG,%eax
                   1153:        jmp     copystr_return
                   1154: #endif /* I386_CPU */
                   1155:
                   1156: #if defined(I486_CPU) || defined(I586_CPU) || defined(I686_CPU)
                   1157: 5:     GET_CURPCB(%eax)
                   1158:        movl    $_C_LABEL(copystr_fault),PCB_ONFAULT(%eax)
                   1159:        /*
                   1160:         * Get min(%edx, VM_MAXUSER_ADDRESS-%edi).
                   1161:         */
                   1162:        movl    $VM_MAXUSER_ADDRESS,%eax
                   1163:        subl    %edi,%eax
                   1164:        cmpl    %edx,%eax
                   1165:        jae     1f
                   1166:        movl    %eax,%edx
                   1167:        movl    %eax,20(%esp)
                   1168:
                   1169: 1:     incl    %edx
                   1170:        cld
                   1171:
                   1172: 1:     decl    %edx
                   1173:        jz      2f
                   1174:        lodsb
                   1175:        stosb
                   1176:        testb   %al,%al
                   1177:        jnz     1b
                   1178:
                   1179:        /* Success -- 0 byte reached. */
                   1180:        decl    %edx
                   1181:        xorl    %eax,%eax
                   1182:        jmp     copystr_return
                   1183:
                   1184: 2:     /* edx is zero -- return EFAULT or ENAMETOOLONG. */
                   1185:        cmpl    $VM_MAXUSER_ADDRESS,%edi
                   1186:        jae     _C_LABEL(copystr_efault)
                   1187:        movl    $ENAMETOOLONG,%eax
                   1188:        jmp     copystr_return
                   1189: #endif /* I486_CPU || I586_CPU || I686_CPU */
                   1190:
                   1191: /*
                   1192:  * int copyinstr(const void *from, void *to, size_t maxlen, size_t *lencopied);
                   1193:  * Copy a NUL-terminated string, at most maxlen characters long, from the
                   1194:  * user's address space.  Return the number of characters copied (including the
                   1195:  * NUL) in *lencopied.  If the string is too long, return ENAMETOOLONG; else
                   1196:  * return 0 or EFAULT.
                   1197:  * see copyinstr(9)
                   1198:  */
                   1199: /* LINTSTUB: Func: int copyinstr(const void *uaddr, void *kaddr, size_t len, size_t *done) */
                   1200: ENTRY(copyinstr)
                   1201:        pushl   %esi
                   1202:        pushl   %edi
                   1203:        GET_CURPCB(%ecx)
                   1204:        movl    $_C_LABEL(copystr_fault),PCB_ONFAULT(%ecx)
                   1205:
                   1206:        movl    12(%esp),%esi           # %esi = from
                   1207:        movl    16(%esp),%edi           # %edi = to
                   1208:        movl    20(%esp),%edx           # %edx = maxlen
                   1209:
                   1210:        /*
                   1211:         * Get min(%edx, VM_MAXUSER_ADDRESS-%esi).
                   1212:         */
                   1213:        movl    $VM_MAXUSER_ADDRESS,%eax
                   1214:        subl    %esi,%eax
                   1215:        cmpl    %edx,%eax
                   1216:        jae     1f
                   1217:        movl    %eax,%edx
                   1218:        movl    %eax,20(%esp)
                   1219:
                   1220: 1:     incl    %edx
                   1221:        cld
                   1222:
                   1223: 1:     decl    %edx
                   1224:        jz      2f
                   1225:        lodsb
                   1226:        stosb
                   1227:        testb   %al,%al
                   1228:        jnz     1b
                   1229:
                   1230:        /* Success -- 0 byte reached. */
                   1231:        decl    %edx
                   1232:        xorl    %eax,%eax
                   1233:        jmp     copystr_return
                   1234:
                   1235: 2:     /* edx is zero -- return EFAULT or ENAMETOOLONG. */
                   1236:        cmpl    $VM_MAXUSER_ADDRESS,%esi
                   1237:        jae     _C_LABEL(copystr_efault)
                   1238:        movl    $ENAMETOOLONG,%eax
                   1239:        jmp     copystr_return
                   1240:
                   1241: /* LINTSTUB: Ignore */
                   1242: NENTRY(copystr_efault)
                   1243:        movl    $EFAULT,%eax
                   1244:
                   1245: /* LINTSTUB: Ignore */
                   1246: NENTRY(copystr_fault)
                   1247: copystr_return:
                   1248:        /* Set *lencopied and return %eax. */
                   1249:        GET_CURPCB(%ecx)
                   1250:        movl    $0,PCB_ONFAULT(%ecx)
                   1251:        movl    20(%esp),%ecx
                   1252:        subl    %edx,%ecx
                   1253:        movl    24(%esp),%edx
                   1254:        testl   %edx,%edx
                   1255:        jz      8f
                   1256:        movl    %ecx,(%edx)
                   1257:
                   1258: 8:     popl    %edi
                   1259:        popl    %esi
                   1260:        ret
                   1261:
                   1262: /*
                   1263:  * int copystr(const void *from, void *to, size_t maxlen, size_t *lencopied);
                   1264:  * Copy a NUL-terminated string, at most maxlen characters long.  Return the
                   1265:  * number of characters copied (including the NUL) in *lencopied.  If the
                   1266:  * string is too long, return ENAMETOOLONG; else return 0.
                   1267:  * see copystr(9)
                   1268:  */
                   1269: /* LINTSTUB: Func: int copystr(const void *kfaddr, void *kdaddr, size_t len, size_t *done) */
                   1270: ENTRY(copystr)
                   1271:        pushl   %esi
                   1272:        pushl   %edi
                   1273:
                   1274:        movl    12(%esp),%esi           # esi = from
                   1275:        movl    16(%esp),%edi           # edi = to
                   1276:        movl    20(%esp),%edx           # edx = maxlen
                   1277:        incl    %edx
                   1278:        cld
                   1279:
                   1280: 1:     decl    %edx
                   1281:        jz      4f
                   1282:        lodsb
                   1283:        stosb
                   1284:        testb   %al,%al
                   1285:        jnz     1b
                   1286:
                   1287:        /* Success -- 0 byte reached. */
                   1288:        decl    %edx
                   1289:        xorl    %eax,%eax
                   1290:        jmp     6f
                   1291:
                   1292: 4:     /* edx is zero -- return ENAMETOOLONG. */
                   1293:        movl    $ENAMETOOLONG,%eax
                   1294:
                   1295: 6:     /* Set *lencopied and return %eax. */
                   1296:        movl    20(%esp),%ecx
                   1297:        subl    %edx,%ecx
                   1298:        movl    24(%esp),%edx
                   1299:        testl   %edx,%edx
                   1300:        jz      7f
                   1301:        movl    %ecx,(%edx)
                   1302:
                   1303: 7:     popl    %edi
                   1304:        popl    %esi
                   1305:        ret
                   1306:
                   1307: /*
                   1308:  * long fuword(const void *uaddr);
                   1309:  * Fetch an int from the user's address space.
                   1310:  * see fuword(9)
                   1311:  */
                   1312: /* LINTSTUB: Func: long fuword(const void *base) */
                   1313: ENTRY(fuword)
                   1314:        movl    4(%esp),%edx
                   1315:        cmpl    $VM_MAXUSER_ADDRESS-4,%edx
                   1316:        ja      _C_LABEL(fusuaddrfault)
                   1317:        GET_CURPCB(%ecx)
                   1318:        movl    $_C_LABEL(fusufault),PCB_ONFAULT(%ecx)
                   1319:        movl    (%edx),%eax
                   1320:        movl    $0,PCB_ONFAULT(%ecx)
                   1321:        ret
                   1322:
                   1323: /*
                   1324:  * int fusword(const void *uaddr);
                   1325:  * Fetch a short from the user's address space.
                   1326:  * see fusword(9)
                   1327:  */
                   1328: /* LINTSTUB: Func: int fusword(const void *base) */
                   1329: ENTRY(fusword)
                   1330:        movl    4(%esp),%edx
                   1331:        cmpl    $VM_MAXUSER_ADDRESS-2,%edx
                   1332:        ja      _C_LABEL(fusuaddrfault)
                   1333:        GET_CURPCB(%ecx)
                   1334:        movl    $_C_LABEL(fusufault),PCB_ONFAULT(%ecx)
                   1335:        movzwl  (%edx),%eax
                   1336:        movl    $0,PCB_ONFAULT(%ecx)
                   1337:        ret
                   1338:
                   1339: /*
                   1340:  * int fuswintr(const void *uaddr);
                   1341:  * Fetch a short from the user's address space.  Can be called during an
                   1342:  * interrupt.
                   1343:  * see fuswintr(9)
                   1344:  */
                   1345: /* LINTSTUB: Func: int fuswintr(const void *base) */
                   1346: ENTRY(fuswintr)
                   1347:        movl    4(%esp),%edx
                   1348:        cmpl    $VM_MAXUSER_ADDRESS-2,%edx
                   1349:        ja      _C_LABEL(fusuaddrfault)
1.5       thorpej  1350:        movl    CPUVAR(CURLWP),%ecx
                   1351:        movl    L_ADDR(%ecx),%ecx
1.1       fvdl     1352:        movl    $_C_LABEL(fusubail),PCB_ONFAULT(%ecx)
                   1353:        movzwl  (%edx),%eax
                   1354:        movl    $0,PCB_ONFAULT(%ecx)
                   1355:        ret
                   1356:
                   1357: /*
                   1358:  * int fubyte(const void *uaddr);
                   1359:  * Fetch a byte from the user's address space.
                   1360:  * see fubyte(9)
                   1361:  */
                   1362: /* LINTSTUB: Func: int fubyte(const void *base) */
                   1363: ENTRY(fubyte)
                   1364:        movl    4(%esp),%edx
                   1365:        cmpl    $VM_MAXUSER_ADDRESS-1,%edx
                   1366:        ja      _C_LABEL(fusuaddrfault)
                   1367:        GET_CURPCB(%ecx)
                   1368:        movl    $_C_LABEL(fusufault),PCB_ONFAULT(%ecx)
                   1369:        movzbl  (%edx),%eax
                   1370:        movl    $0,PCB_ONFAULT(%ecx)
                   1371:        ret
                   1372:
                   1373: /*
                   1374:  * Handle faults from [fs]u*().  Clean up and return -1.
                   1375:  */
                   1376: /* LINTSTUB: Ignore */
                   1377: NENTRY(fusufault)
                   1378:        movl    $0,PCB_ONFAULT(%ecx)
                   1379:        movl    $-1,%eax
                   1380:        ret
                   1381:
                   1382: /*
                   1383:  * Handle faults from [fs]u*().  Clean up and return -1.  This differs from
                   1384:  * fusufault() in that trap() will recognize it and return immediately rather
                   1385:  * than trying to page fault.
                   1386:  */
                   1387: /* LINTSTUB: Ignore */
                   1388: NENTRY(fusubail)
                   1389:        movl    $0,PCB_ONFAULT(%ecx)
                   1390:        movl    $-1,%eax
                   1391:        ret
                   1392:
                   1393: /*
                   1394:  * Handle earlier faults from [fs]u*(), due to our of range addresses.
                   1395:  */
                   1396: /* LINTSTUB: Ignore */
                   1397: NENTRY(fusuaddrfault)
                   1398:        movl    $-1,%eax
                   1399:        ret
                   1400:
                   1401: /*
                   1402:  * int suword(void *uaddr, long x);
                   1403:  * Store an int in the user's address space.
                   1404:  * see suword(9)
                   1405:  */
                   1406: /* LINTSTUB: Func: int suword(void *base, long c) */
                   1407: ENTRY(suword)
                   1408:        movl    4(%esp),%edx
                   1409:        cmpl    $VM_MAXUSER_ADDRESS-4,%edx
                   1410:        ja      _C_LABEL(fusuaddrfault)
                   1411:
                   1412: #if defined(I386_CPU)
                   1413: #if defined(I486_CPU) || defined(I586_CPU) || defined(I686_CPU)
                   1414:        cmpl    $CPUCLASS_386,_C_LABEL(cpu_class)
                   1415:        jne     2f
                   1416: #endif /* I486_CPU || I586_CPU || I686_CPU */
                   1417:
                   1418:        GET_CURPCB(%eax)
                   1419:        movl    $3f,PCB_ONFAULT(%eax)
                   1420:
                   1421:        movl    %edx,%eax
                   1422:        shrl    $PGSHIFT,%eax           # calculate pte address
                   1423:        testb   $PG_RW,_C_LABEL(PTmap)(,%eax,4)
                   1424:        jnz     1f
                   1425:
                   1426: 3:     /* Simulate a trap. */
                   1427:        pushl   %edx
                   1428:        pushl   %edx
                   1429:        call    _C_LABEL(trapwrite)     # trapwrite(addr)
                   1430:        addl    $4,%esp                 # clear parameter from the stack
                   1431:        popl    %edx
                   1432:        GET_CURPCB(%ecx)
                   1433:        testl   %eax,%eax
                   1434:        jnz     _C_LABEL(fusufault)
                   1435:
                   1436: 1:     /* XXX also need to check the following 3 bytes for validity! */
                   1437: #endif
                   1438:
                   1439: 2:     GET_CURPCB(%ecx)
                   1440:        movl    $_C_LABEL(fusufault),PCB_ONFAULT(%ecx)
                   1441:
                   1442:        movl    8(%esp),%eax
                   1443:        movl    %eax,(%edx)
                   1444:        xorl    %eax,%eax
                   1445:        movl    %eax,PCB_ONFAULT(%ecx)
                   1446:        ret
                   1447:
                   1448: /*
                   1449:  * int susword(void *uaddr, short x);
                   1450:  * Store a short in the user's address space.
                   1451:  * see susword(9)
                   1452:  */
                   1453: /* LINTSTUB: Func: int susword(void *base, short c) */
                   1454: ENTRY(susword)
                   1455:        movl    4(%esp),%edx
                   1456:        cmpl    $VM_MAXUSER_ADDRESS-2,%edx
                   1457:        ja      _C_LABEL(fusuaddrfault)
                   1458:
                   1459: #if defined(I386_CPU)
                   1460: #if defined(I486_CPU) || defined(I586_CPU) || defined(I686_CPU)
                   1461:        cmpl    $CPUCLASS_386,_C_LABEL(cpu_class)
                   1462:        jne     2f
                   1463: #endif /* I486_CPU || I586_CPU || I686_CPU */
                   1464:
                   1465:        GET_CURPCB(%eax)
                   1466:        movl    $3f,PCB_ONFAULT(%eax)
                   1467:
                   1468:        movl    %edx,%eax
                   1469:        shrl    $PGSHIFT,%eax           # calculate pte address
                   1470:        testb   $PG_RW,_C_LABEL(PTmap)(,%eax,4)
                   1471:        jnz     1f
                   1472:
                   1473: 3:     /* Simulate a trap. */
                   1474:        pushl   %edx
                   1475:        pushl   %edx
                   1476:        call    _C_LABEL(trapwrite)     # trapwrite(addr)
                   1477:        addl    $4,%esp                 # clear parameter from the stack
                   1478:        popl    %edx
                   1479:        GET_CURPCB(%ecx)
                   1480:        testl   %eax,%eax
                   1481:        jnz     _C_LABEL(fusufault)
                   1482:
                   1483: 1:     /* XXX also need to check the following byte for validity! */
                   1484: #endif
                   1485:
                   1486: 2:     GET_CURPCB(%ecx)
                   1487:        movl    $_C_LABEL(fusufault),PCB_ONFAULT(%ecx)
                   1488:
                   1489:        movl    8(%esp),%eax
                   1490:        movw    %ax,(%edx)
                   1491:        xorl    %eax,%eax
                   1492:        movl    %eax,PCB_ONFAULT(%ecx)
                   1493:        ret
                   1494:
                   1495: /*
                   1496:  * int suswintr(void *uaddr, short x);
                   1497:  * Store a short in the user's address space.  Can be called during an
                   1498:  * interrupt.
                   1499:  * see suswintr(9)
                   1500:  */
                   1501: /* LINTSTUB: Func: int suswintr(void *base, short c) */
                   1502: ENTRY(suswintr)
                   1503:        movl    4(%esp),%edx
                   1504:        cmpl    $VM_MAXUSER_ADDRESS-2,%edx
                   1505:        ja      _C_LABEL(fusuaddrfault)
1.5       thorpej  1506:        movl    CPUVAR(CURLWP),%ecx
                   1507:        movl    L_ADDR(%ecx),%ecx
1.1       fvdl     1508:        movl    $_C_LABEL(fusubail),PCB_ONFAULT(%ecx)
                   1509:
                   1510: #if defined(I386_CPU)
                   1511: #if defined(I486_CPU) || defined(I586_CPU) || defined(I686_CPU)
                   1512:        cmpl    $CPUCLASS_386,_C_LABEL(cpu_class)
                   1513:        jne     2f
                   1514: #endif /* I486_CPU || I586_CPU || I686_CPU */
                   1515:
                   1516:        movl    %edx,%eax
                   1517:        shrl    $PGSHIFT,%eax           # calculate pte address
                   1518:        testb   $PG_RW,_C_LABEL(PTmap)(,%eax,4)
                   1519:        jnz     1f
                   1520:
                   1521:        /* Simulate a trap. */
                   1522:        jmp     _C_LABEL(fusubail)
                   1523:
                   1524: 1:     /* XXX also need to check the following byte for validity! */
                   1525: #endif
                   1526:
                   1527: 2:     movl    8(%esp),%eax
                   1528:        movw    %ax,(%edx)
                   1529:        xorl    %eax,%eax
                   1530:        movl    %eax,PCB_ONFAULT(%ecx)
                   1531:        ret
                   1532:
                   1533: /*
                   1534:  * int subyte(void *uaddr, char x);
                   1535:  * Store a byte in the user's address space.
                   1536:  * see subyte(9)
                   1537:  */
                   1538: /* LINTSTUB: Func: int subyte(void *base, int c) */
                   1539: ENTRY(subyte)
                   1540:        movl    4(%esp),%edx
                   1541:        cmpl    $VM_MAXUSER_ADDRESS-1,%edx
                   1542:        ja      _C_LABEL(fusuaddrfault)
                   1543:
                   1544: #if defined(I386_CPU)
                   1545: #if defined(I486_CPU) || defined(I586_CPU) || defined(I686_CPU)
                   1546:        cmpl    $CPUCLASS_386,_C_LABEL(cpu_class)
                   1547:        jne     2f
                   1548: #endif /* I486_CPU || I586_CPU || I686_CPU */
                   1549:
                   1550:        GET_CURPCB(%eax)
                   1551:        movl    $3f,PCB_ONFAULT(%eax)
                   1552:
                   1553:        movl    %edx,%eax
                   1554:        shrl    $PGSHIFT,%eax           # calculate pte address
                   1555:        testb   $PG_RW,_C_LABEL(PTmap)(,%eax,4)
                   1556:        jnz     1f
                   1557:
                   1558: 3:     /* Simulate a trap. */
                   1559:        pushl   %edx
                   1560:        pushl   %edx
                   1561:        call    _C_LABEL(trapwrite)     # trapwrite(addr)
                   1562:        addl    $4,%esp                 # clear parameter from the stack
                   1563:        popl    %edx
                   1564:        GET_CURPCB(%ecx)
                   1565:        testl   %eax,%eax
                   1566:        jnz     _C_LABEL(fusufault)
                   1567:
                   1568: 1:
                   1569: #endif
                   1570:
                   1571: 2:     GET_CURPCB(%ecx)
                   1572:        movl    $_C_LABEL(fusufault),PCB_ONFAULT(%ecx)
                   1573:
                   1574:        movb    8(%esp),%al
                   1575:        movb    %al,(%edx)
                   1576:        xorl    %eax,%eax
                   1577:        movl    %eax,PCB_ONFAULT(%ecx)
                   1578:        ret
                   1579:
                   1580: /*****************************************************************************/
                   1581:
                   1582: /*
                   1583:  * The following is i386-specific nonsense.
                   1584:  */
                   1585:
                   1586: /*
                   1587:  * void lgdt(struct region_descriptor *rdp);
                   1588:  * Load a new GDT pointer (and do any necessary cleanup).
                   1589:  * XXX It's somewhat questionable whether reloading all the segment registers
                   1590:  * is necessary, since the actual descriptor data is not changed except by
                   1591:  * process creation and exit, both of which clean up via task switches.  OTOH,
                   1592:  * this only happens at run time when the GDT is resized.
                   1593:  */
                   1594: /* LINTSTUB: Func: void lgdt(struct region_descriptor *rdp) */
                   1595: NENTRY(lgdt)
                   1596:        /* Reload the descriptor table. */
                   1597:        movl    4(%esp),%eax
                   1598:        lgdt    (%eax)
                   1599:        /* Flush the prefetch queue. */
                   1600:        jmp     1f
                   1601:        nop
                   1602: 1:     /* Reload "stale" selectors. */
                   1603:        movl    $GSEL(GDATA_SEL, SEL_KPL),%eax
                   1604:        movw    %ax,%ds
                   1605:        movw    %ax,%es
                   1606:        movw    %ax,%gs
                   1607:        movw    %ax,%ss
                   1608:        movl    $GSEL(GCPU_SEL, SEL_KPL),%eax
                   1609:        movw    %ax,%fs
                   1610:        /* Reload code selector by doing intersegment return. */
                   1611:        popl    %eax
                   1612:        pushl   $GSEL(GCODE_SEL, SEL_KPL)
                   1613:        pushl   %eax
                   1614:        lret
                   1615:
                   1616: /*****************************************************************************/
                   1617:
                   1618: /*
                   1619:  * These functions are primarily used by DDB.
                   1620:  */
                   1621:
                   1622: /* LINTSTUB: Func: int setjmp (label_t *l) */
                   1623: ENTRY(setjmp)
                   1624:        movl    4(%esp),%eax
                   1625:        movl    %ebx,(%eax)             # save ebx
                   1626:        movl    %esp,4(%eax)            # save esp
                   1627:        movl    %ebp,8(%eax)            # save ebp
                   1628:        movl    %esi,12(%eax)           # save esi
                   1629:        movl    %edi,16(%eax)           # save edi
                   1630:        movl    (%esp),%edx             # get rta
                   1631:        movl    %edx,20(%eax)           # save eip
                   1632:        xorl    %eax,%eax               # return (0);
                   1633:        ret
                   1634:
                   1635: /* LINTSTUB: Func: void longjmp (label_t *l) */
                   1636: ENTRY(longjmp)
                   1637:        movl    4(%esp),%eax
                   1638:        movl    (%eax),%ebx             # restore ebx
                   1639:        movl    4(%eax),%esp            # restore esp
                   1640:        movl    8(%eax),%ebp            # restore ebp
                   1641:        movl    12(%eax),%esi           # restore esi
                   1642:        movl    16(%eax),%edi           # restore edi
                   1643:        movl    20(%eax),%edx           # get rta
                   1644:        movl    %edx,(%esp)             # put in return frame
                   1645:        xorl    %eax,%eax               # return (1);
                   1646:        incl    %eax
                   1647:        ret
                   1648:
                   1649: /*****************************************************************************/
                   1650:
                   1651:        .globl  _C_LABEL(sched_whichqs),_C_LABEL(sched_qs)
                   1652:        .globl  _C_LABEL(uvmexp),_C_LABEL(panic)
                   1653:
                   1654: #ifdef DIAGNOSTIC
                   1655: NENTRY(switch_error)
                   1656:        pushl   $1f
                   1657:        call    _C_LABEL(panic)
                   1658:        /* NOTREACHED */
                   1659: 1:     .asciz  "cpu_switch"
                   1660: #endif /* DIAGNOSTIC */
                   1661:
                   1662: /*
1.5       thorpej  1663:  * void cpu_switch(struct lwp *)
1.1       fvdl     1664:  * Find a runnable process and switch to it.  Wait if necessary.  If the new
                   1665:  * process is the same as the old one, we short-circuit the context save and
                   1666:  * restore.
                   1667:  *
                   1668:  * Note that the stack frame layout is known to "struct switchframe"
                   1669:  * in <machine/frame.h> and to the code in cpu_fork() which initializes
1.5       thorpej  1670:  * it for a new lwp.
1.1       fvdl     1671:  */
                   1672: ENTRY(cpu_switch)
                   1673:        pushl   %ebx
                   1674:        pushl   %esi
                   1675:        pushl   %edi
                   1676:
                   1677: #ifdef DEBUG
                   1678:        cmpl    $IPL_SCHED,CPUVAR(ILEVEL)
                   1679:        jae     1f
1.5       thorpej  1680:        pushl   $2f
1.1       fvdl     1681:        call    _C_LABEL(panic)
                   1682:        /* NOTREACHED */
1.5       thorpej  1683: 2:     .asciz  "not splsched() in cpu_switch!"
1.1       fvdl     1684: 1:
                   1685: #endif /* DEBUG */
                   1686:
1.5       thorpej  1687:        movl    16(%esp),%esi           # current
1.1       fvdl     1688:
                   1689:        /*
1.5       thorpej  1690:         * Clear curlwp so that we don't accumulate system time while idle.
                   1691:         * This also insures that schedcpu() will move the old lwp to
1.1       fvdl     1692:         * the correct queue if it happens to get called from the spllower()
                   1693:         * below and changes the priority.  (See corresponding comment in
                   1694:         * userret()).
                   1695:         */
1.5       thorpej  1696:        movl    $0,CPUVAR(CURLWP)
1.1       fvdl     1697:        /*
1.5       thorpej  1698:         * First phase: find new lwp.
1.1       fvdl     1699:         *
                   1700:         * Registers:
                   1701:         *   %eax - queue head, scratch, then zero
                   1702:         *   %ebx - queue number
                   1703:         *   %ecx - cached value of whichqs
1.5       thorpej  1704:         *   %edx - next lwp in queue
                   1705:         *   %esi - old lwp
                   1706:         *   %edi - new lwp
1.1       fvdl     1707:         */
                   1708:
1.5       thorpej  1709:        /* Look for new lwp. */
1.1       fvdl     1710:        cli                             # splhigh doesn't do a cli
                   1711:        movl    _C_LABEL(sched_whichqs),%ecx
                   1712:        bsfl    %ecx,%ebx               # find a full q
                   1713:        jnz     switch_dequeue
                   1714:
                   1715:        /*
                   1716:         * idling:      save old context.
                   1717:         *
                   1718:         * Registers:
                   1719:         *   %eax, %ecx - scratch
1.5       thorpej  1720:         *   %esi - old lwp, then old pcb
1.1       fvdl     1721:         *   %edi - idle pcb
                   1722:         */
                   1723:
                   1724:        pushl   %esi
                   1725:        call    _C_LABEL(pmap_deactivate)       # pmap_deactivate(oldproc)
                   1726:        addl    $4,%esp
                   1727:
1.5       thorpej  1728:        movl    L_ADDR(%esi),%esi
1.1       fvdl     1729:
                   1730:        /* Save stack pointers. */
                   1731:        movl    %esp,PCB_ESP(%esi)
                   1732:        movl    %ebp,PCB_EBP(%esi)
                   1733:
                   1734:        /* Find idle PCB for this CPU */
                   1735: #ifndef MULTIPROCESSOR
1.5       thorpej  1736:        movl    $_C_LABEL(lwp0),%ebx
                   1737:        movl    L_ADDR(%ebx),%edi
                   1738:        movl    L_MD_TSS_SEL(%ebx),%edx
1.1       fvdl     1739: #else
                   1740:        movl    CPUVAR(IDLE_PCB),%edi
                   1741:        movl    CPUVAR(IDLE_TSS_SEL),%edx
                   1742: #endif
1.5       thorpej  1743:        movl    $0,CPUVAR(CURLWP)               /* In case we fault... */
1.1       fvdl     1744:
                   1745:        /* Restore the idle context (avoid interrupts) */
                   1746:        cli
                   1747:
                   1748:        /* Restore stack pointers. */
                   1749:        movl    PCB_ESP(%edi),%esp
                   1750:        movl    PCB_EBP(%edi),%ebp
                   1751:
                   1752:
                   1753:        /* Switch address space. */
                   1754:        movl    PCB_CR3(%edi),%ecx
                   1755:        movl    %ecx,%cr3
                   1756:
                   1757:        /* Switch TSS. Reset "task busy" flag before loading. */
                   1758: #ifdef MULTIPROCESSOR
                   1759:        movl    CPUVAR(GDT),%eax
                   1760: #else
                   1761:        movl    _C_LABEL(gdt),%eax
                   1762: #endif
                   1763:        andl    $~0x0200,4-SEL_KPL(%eax,%edx,1)
                   1764:        ltr     %dx
                   1765:
                   1766:        /* We're always in the kernel, so we don't need the LDT. */
                   1767:
                   1768:        /* Restore cr0 (including FPU state). */
                   1769:        movl    PCB_CR0(%edi),%ecx
                   1770:        movl    %ecx,%cr0
                   1771:
                   1772:        /* Record new pcb. */
                   1773:        SET_CURPCB(%edi)
                   1774:
                   1775:        xorl    %esi,%esi
                   1776:        sti
                   1777: idle_unlock:
                   1778: #if defined(MULTIPROCESSOR) || defined(LOCKDEBUG)
                   1779:        call    _C_LABEL(sched_unlock_idle)
                   1780: #endif
                   1781:        /* Interrupts are okay again. */
1.2       fvdl     1782:        pushl   $IPL_NONE               # spl0()
1.1       fvdl     1783:        call    _C_LABEL(Xspllower)     # process pending interrupts
1.2       fvdl     1784:        addl    $4,%esp
1.1       fvdl     1785:        jmp     idle_start
                   1786: idle_zero:
                   1787:        sti
                   1788:        call    _C_LABEL(uvm_pageidlezero)
                   1789:        cli
                   1790:        cmpl    $0,_C_LABEL(sched_whichqs)
                   1791:        jnz     idle_exit
                   1792: idle_loop:
                   1793:        /* Try to zero some pages. */
                   1794:        movl    _C_LABEL(uvm)+UVM_PAGE_IDLE_ZERO,%ecx
                   1795:        testl   %ecx,%ecx
                   1796:        jnz     idle_zero
                   1797:        sti
                   1798:        hlt
                   1799: NENTRY(mpidle)
                   1800: idle_start:
                   1801:        cli
                   1802:        cmpl    $0,_C_LABEL(sched_whichqs)
                   1803:        jz      idle_loop
                   1804: idle_exit:
                   1805:        movl    $IPL_HIGH,CPUVAR(ILEVEL)                # splhigh
                   1806: #if defined(MULTIPROCESSOR) || defined(LOCKDEBUG)
                   1807:        call    _C_LABEL(sched_lock_idle)
                   1808: #endif
                   1809:        movl    _C_LABEL(sched_whichqs),%ecx
                   1810:        bsfl    %ecx,%ebx
                   1811:        jz      idle_unlock
                   1812:
                   1813: switch_dequeue:
                   1814:        /*
                   1815:         * we're running at splhigh(), but it's otherwise okay to take
                   1816:         * interrupts here.
                   1817:         */
                   1818:        sti
                   1819:        leal    _C_LABEL(sched_qs)(,%ebx,8),%eax # select q
                   1820:
1.5       thorpej  1821:        movl    L_FORW(%eax),%edi       # unlink from front of process q
1.1       fvdl     1822: #ifdef DIAGNOSTIC
                   1823:        cmpl    %edi,%eax               # linked to self (i.e. nothing queued)?
                   1824:        je      _C_LABEL(switch_error)  # not possible
                   1825: #endif /* DIAGNOSTIC */
1.5       thorpej  1826:        movl    L_FORW(%edi),%edx
                   1827:        movl    %edx,L_FORW(%eax)
                   1828:        movl    %eax,L_BACK(%edx)
1.1       fvdl     1829:
                   1830:        cmpl    %edx,%eax               # q empty?
                   1831:        jne     3f
                   1832:
                   1833:        btrl    %ebx,%ecx               # yes, clear to indicate empty
                   1834:        movl    %ecx,_C_LABEL(sched_whichqs) # update q status
                   1835:
                   1836: 3:     /* We just did it. */
                   1837:        xorl    %eax,%eax
                   1838:        CLEAR_RESCHED(%eax)
                   1839:
1.5       thorpej  1840: switch_resume:
1.1       fvdl     1841: #ifdef DIAGNOSTIC
1.5       thorpej  1842:        cmpl    %eax,L_WCHAN(%edi)      # Waiting for something?
1.1       fvdl     1843:        jne     _C_LABEL(switch_error)  # Yes; shouldn't be queued.
1.5       thorpej  1844:        cmpb    $LSRUN,L_STAT(%edi)     # In run state?
1.1       fvdl     1845:        jne     _C_LABEL(switch_error)  # No; shouldn't be queued.
                   1846: #endif /* DIAGNOSTIC */
                   1847:
1.5       thorpej  1848:        /* Isolate lwp.  XXX Is this necessary? */
                   1849:        movl    %eax,L_BACK(%edi)
1.1       fvdl     1850:
1.5       thorpej  1851:        /* Record new lwp. */
                   1852:        movb    $LSONPROC,L_STAT(%edi)  # l->l_stat = LSONPROC
                   1853:        SET_CURLWP(%edi,%ecx)
1.1       fvdl     1854:
1.5       thorpej  1855:        /* Skip context switch if same lwp. */
                   1856:        movl    $1, %eax
1.1       fvdl     1857:        cmpl    %edi,%esi
                   1858:        je      switch_return
                   1859:
1.5       thorpej  1860:        /* If old lwp exited, don't bother. */
1.1       fvdl     1861:        testl   %esi,%esi
                   1862:        jz      switch_exited
                   1863:
                   1864:        /*
                   1865:         * Second phase: save old context.
                   1866:         *
                   1867:         * Registers:
                   1868:         *   %eax, %ecx - scratch
1.5       thorpej  1869:         *   %esi - old lwp, then old pcb
                   1870:         *   %edi - new lwp
1.1       fvdl     1871:         */
                   1872:
                   1873:        pushl   %esi
                   1874:        call    _C_LABEL(pmap_deactivate)       # pmap_deactivate(oldproc)
                   1875:        addl    $4,%esp
                   1876:
1.5       thorpej  1877:        movl    L_ADDR(%esi),%esi
1.1       fvdl     1878:
                   1879:        /* Save stack pointers. */
                   1880:        movl    %esp,PCB_ESP(%esi)
                   1881:        movl    %ebp,PCB_EBP(%esi)
                   1882:
                   1883: switch_exited:
                   1884:        /*
                   1885:         * Third phase: restore saved context.
                   1886:         *
                   1887:         * Registers:
                   1888:         *   %eax, %ebx, %ecx, %edx - scratch
                   1889:         *   %esi - new pcb
1.5       thorpej  1890:         *   %edi - new lwp
1.1       fvdl     1891:         */
                   1892:
                   1893:        /* No interrupts while loading new state. */
                   1894:        cli
1.5       thorpej  1895:        movl    L_ADDR(%edi),%esi
1.1       fvdl     1896:
                   1897:        /* Restore stack pointers. */
                   1898:        movl    PCB_ESP(%esi),%esp
                   1899:        movl    PCB_EBP(%esi),%ebp
                   1900:
                   1901: #if 0
                   1902:        /* Don't bother with the rest if switching to a system process. */
1.5       thorpej  1903:        testl   $P_SYSTEM,L_FLAG(%edi); XXX NJWLWP lwp's don't have P_SYSTEM!
1.1       fvdl     1904:        jnz     switch_restored
                   1905: #endif
                   1906:
                   1907: #ifdef MULTIPROCESSOR
                   1908:        movl    CPUVAR(GDT),%eax
                   1909: #else
                   1910:        /* Load TSS info. */
                   1911:        movl    _C_LABEL(gdt),%eax
                   1912: #endif
1.5       thorpej  1913:        movl    L_MD_TSS_SEL(%edi),%edx
1.1       fvdl     1914:
                   1915:        /* Switch TSS. Reset "task busy" flag before loading. */
                   1916:        andl    $~0x0200,4(%eax,%edx, 1)
                   1917:        ltr     %dx
                   1918:
                   1919:        pushl   %edi
                   1920:        call    _C_LABEL(pmap_activate)         # pmap_activate(p)
                   1921:        addl    $4,%esp
                   1922:
                   1923: #if 0
                   1924: switch_restored:
                   1925: #endif
                   1926:        /* Restore cr0 (including FPU state). */
                   1927:        movl    PCB_CR0(%esi),%ecx
                   1928: #ifdef MULTIPROCESSOR
                   1929:        /*
                   1930:         * If our floating point registers are on a different cpu,
                   1931:         * clear CR0_TS so we'll trap rather than reuse bogus state.
                   1932:         */
                   1933:        movl    PCB_FPCPU(%esi),%ebx
                   1934:        cmpl    CPUVAR(SELF),%ebx
                   1935:        jz      1f
                   1936:        orl     $CR0_TS,%ecx
                   1937: 1:
                   1938: #endif
                   1939:        movl    %ecx,%cr0
                   1940:
                   1941:        /* Record new pcb. */
                   1942:        SET_CURPCB(%esi)
                   1943:
                   1944:        /* Interrupts are okay again. */
                   1945:        sti
                   1946:
                   1947: /*
                   1948:  *  Check for restartable atomic sequences (RAS)
                   1949:  */
1.5       thorpej  1950:        movl    CPUVAR(CURLWP),%edi
                   1951:        movl    L_PROC(%edi),%esi
                   1952:        cmpl    $0,P_NRAS(%esi)
1.1       fvdl     1953:        je      1f
1.5       thorpej  1954:        movl    L_MD_REGS(%edi),%ebx
1.4       gmcgarry 1955:        movl    TF_EIP(%ebx),%eax
1.1       fvdl     1956:        pushl   %eax
1.5       thorpej  1957:        pushl   %esi
1.1       fvdl     1958:        call    _C_LABEL(ras_lookup)
                   1959:        addl    $8,%esp
                   1960:        cmpl    $-1,%eax
                   1961:        je      1f
1.4       gmcgarry 1962:        movl    %eax,TF_EIP(%ebx)
1.1       fvdl     1963: 1:
1.5       thorpej  1964:        xor     %eax,%eax
1.1       fvdl     1965:
                   1966: switch_return:
                   1967: #if defined(MULTIPROCESSOR) || defined(LOCKDEBUG)
                   1968:        call    _C_LABEL(sched_unlock_idle)
                   1969: #endif
1.2       fvdl     1970:        pushl   $IPL_NONE               # spl0()
1.1       fvdl     1971:        call    _C_LABEL(Xspllower)     # process pending interrupts
1.2       fvdl     1972:        addl    $4,%esp
1.1       fvdl     1973:        movl    $IPL_HIGH,CPUVAR(ILEVEL)        # splhigh()
                   1974:
                   1975:        popl    %edi
                   1976:        popl    %esi
                   1977:        popl    %ebx
                   1978:        ret
                   1979:
                   1980: /*
1.5       thorpej  1981:  * void cpu_switchto(struct lwp *current, struct lwp *next)
                   1982:  * Switch to the specified next LWP.
                   1983:  */
                   1984: ENTRY(cpu_switchto)
                   1985:        pushl   %ebx
                   1986:        pushl   %esi
                   1987:        pushl   %edi
                   1988:
                   1989: #ifdef DEBUG
                   1990:        cmpl    $IPL_SCHED,CPUVAR(ILEVEL)
                   1991:        jae     1f
                   1992:        pushl   $2f
                   1993:        call    _C_LABEL(panic)
                   1994:        /* NOTREACHED */
                   1995: 2:     .asciz  "not splsched() in cpu_switchto!"
                   1996: 1:
                   1997: #endif /* DEBUG */
                   1998:
                   1999:        movl    16(%esp),%esi           # current
                   2000:        movl    20(%esp),%edi           # next
                   2001:
                   2002:        /*
                   2003:         * Clear curlwp so that we don't accumulate system time while idle.
                   2004:         * This also insures that schedcpu() will move the old process to
                   2005:         * the correct queue if it happens to get called from the spllower()
                   2006:         * below and changes the priority.  (See corresponding comment in
                   2007:         * usrret()).
                   2008:         *
                   2009:         * XXX Is this necessary?  We know we won't go idle.
                   2010:         */
                   2011:        movl    $0,CPUVAR(CURLWP)
                   2012:
                   2013:        /*
                   2014:         * We're running at splhigh(), but it's otherwise okay to take
                   2015:         * interrupts here.
                   2016:         */
                   2017:        sti
                   2018:
                   2019:        /* Jump into the middle of cpu_switch */
                   2020:        xorl    %eax,%eax
                   2021:        jmp     switch_resume
                   2022:
                   2023: /*
                   2024:  * void switch_exit(struct lwp *l, void (*exit)(struct lwp *));
                   2025:  * Switch to the appropriate idle context (lwp0's if uniprocessor; the cpu's
1.1       fvdl     2026:  * if multiprocessor) and deallocate the address space and kernel stack for p.
                   2027:  * Then jump into cpu_switch(), as if we were in the idle proc all along.
                   2028:  */
                   2029: #ifndef MULTIPROCESSOR
1.5       thorpej  2030:        .globl  _C_LABEL(lwp0)
1.1       fvdl     2031: #endif
                   2032:        .globl  _C_LABEL(uvmspace_free),_C_LABEL(kernel_map)
                   2033:        .globl  _C_LABEL(uvm_km_free),_C_LABEL(tss_free)
1.6       drochner 2034: /* LINTSTUB: Func: void switch_exit(struct lwp *l, void (*exit)(struct lwp *)) */
1.1       fvdl     2035: ENTRY(switch_exit)
                   2036:        movl    4(%esp),%edi            # old process
1.5       thorpej  2037:        movl    8(%esp),%eax            # exit func
1.1       fvdl     2038: #ifndef MULTIPROCESSOR
1.5       thorpej  2039:        movl    $_C_LABEL(lwp0),%ebx
                   2040:        movl    L_ADDR(%ebx),%esi
                   2041:        movl    L_MD_TSS_SEL(%ebx),%edx
1.1       fvdl     2042: #else
                   2043:        movl    CPUVAR(IDLE_PCB),%esi
                   2044:        movl    CPUVAR(IDLE_TSS_SEL),%edx
                   2045: #endif
                   2046:        /* In case we fault... */
1.5       thorpej  2047:        movl    $0,CPUVAR(CURLWP)
1.1       fvdl     2048:
                   2049:        /* Restore the idle context. */
                   2050:        cli
                   2051:
                   2052:        /* Restore stack pointers. */
                   2053:        movl    PCB_ESP(%esi),%esp
                   2054:        movl    PCB_EBP(%esi),%ebp
                   2055:
1.5       thorpej  2056:        /* Save exit func. */
                   2057:        pushl   %eax
                   2058:
1.1       fvdl     2059:        /* Load TSS info. */
                   2060: #ifdef MULTIPROCESSOR
                   2061:        movl    CPUVAR(GDT),%eax
                   2062: #else
                   2063:        /* Load TSS info. */
                   2064:        movl    _C_LABEL(gdt),%eax
                   2065: #endif
                   2066:
                   2067:        /* Switch address space. */
                   2068:        movl    PCB_CR3(%esi),%ecx
                   2069:        movl    %ecx,%cr3
                   2070:
                   2071:        /* Switch TSS. */
                   2072:        andl    $~0x0200,4-SEL_KPL(%eax,%edx,1)
                   2073:        ltr     %dx
                   2074:
                   2075:        /* We're always in the kernel, so we don't need the LDT. */
                   2076:
                   2077:        /* Restore cr0 (including FPU state). */
                   2078:        movl    PCB_CR0(%esi),%ecx
                   2079:        movl    %ecx,%cr0
                   2080:
                   2081:        /* Record new pcb. */
                   2082:        SET_CURPCB(%esi)
                   2083:
                   2084:        /* Interrupts are okay again. */
                   2085:        sti
                   2086:
                   2087:        /*
                   2088:         * Schedule the dead process's vmspace and stack to be freed.
                   2089:         */
1.5       thorpej  2090:        movl    0(%esp),%eax            /* %eax = exit func */
                   2091:        movl    %edi,0(%esp)            /* {lwp_}exit2(l) */
                   2092:        call    *%eax
1.1       fvdl     2093:        addl    $4,%esp
                   2094:
                   2095:        /* Jump into cpu_switch() with the right state. */
                   2096:        xorl    %esi,%esi
1.5       thorpej  2097:        movl    %esi,CPUVAR(CURLWP)
1.1       fvdl     2098:        jmp     idle_start
                   2099:
                   2100: /*
                   2101:  * void savectx(struct pcb *pcb);
                   2102:  * Update pcb, saving current processor state.
                   2103:  */
                   2104: /* LINTSTUB: Func: void savectx(struct pcb *pcb) */
                   2105: ENTRY(savectx)
                   2106:        movl    4(%esp),%edx            # edx = p->p_addr
                   2107:
                   2108:        /* Save stack pointers. */
                   2109:        movl    %esp,PCB_ESP(%edx)
                   2110:        movl    %ebp,PCB_EBP(%edx)
                   2111:
                   2112:        ret
                   2113:
                   2114: /*
                   2115:  * Old call gate entry for syscall
                   2116:  */
                   2117: /* LINTSTUB: Var: char Xosyscall[1]; */
                   2118: IDTVEC(osyscall)
                   2119:        /* Set eflags in trap frame. */
                   2120:        pushfl
                   2121:        popl    8(%esp)
                   2122:        pushl   $7              # size of instruction for restart
                   2123:        jmp     syscall1
                   2124:
                   2125: /*
                   2126:  * Trap gate entry for syscall
                   2127:  */
                   2128: /* LINTSTUB: Var: char Xsyscall[1]; */
                   2129: IDTVEC(syscall)
                   2130:        pushl   $2              # size of instruction for restart
                   2131: syscall1:
                   2132:        pushl   $T_ASTFLT       # trap # for doing ASTs
                   2133:        INTRENTRY
                   2134:
                   2135: #ifdef DIAGNOSTIC
                   2136:        movl    CPUVAR(ILEVEL),%ebx
                   2137:        testl   %ebx,%ebx
                   2138:        jz      1f
                   2139:        pushl   $5f
                   2140:        call    _C_LABEL(printf)
                   2141:        addl    $4,%esp
                   2142: #ifdef DDB
                   2143:        int     $3
                   2144: #endif
                   2145: 1:
                   2146: #endif /* DIAGNOSTIC */
1.5       thorpej  2147:        movl    CPUVAR(CURLWP),%edx
                   2148:        movl    %esp,L_MD_REGS(%edx)    # save pointer to frame
                   2149:        movl    L_PROC(%edx),%edx
1.1       fvdl     2150:        call    *P_MD_SYSCALL(%edx)     # get pointer to syscall() function
                   2151: 2:     /* Check for ASTs on exit to user mode. */
                   2152:        cli
1.5       thorpej  2153:        CHECK_ASTPENDING(%eax)
1.1       fvdl     2154:        je      1f
                   2155:        /* Always returning to user mode here. */
1.5       thorpej  2156:        CLEAR_ASTPENDING(%eax)
1.1       fvdl     2157:        sti
                   2158:        /* Pushed T_ASTFLT into tf_trapno on entry. */
                   2159:        call    _C_LABEL(trap)
                   2160:        jmp     2b
                   2161: #ifndef DIAGNOSTIC
                   2162: 1:     INTRFASTEXIT
                   2163: #else /* DIAGNOSTIC */
                   2164: 1:     cmpl    $IPL_NONE,CPUVAR(ILEVEL)
                   2165:        jne     3f
                   2166:        INTRFASTEXIT
                   2167: 3:     sti
                   2168:        pushl   $4f
                   2169:        call    _C_LABEL(printf)
                   2170:        addl    $4,%esp
                   2171: #ifdef DDB
                   2172:        int     $3
                   2173: #endif /* DDB */
                   2174:        movl    $IPL_NONE,CPUVAR(ILEVEL)
                   2175:        jmp     2b
                   2176: 4:     .asciz  "WARNING: SPL NOT LOWERED ON SYSCALL EXIT\n"
                   2177: 5:     .asciz  "WARNING: SPL NOT ZERO ON SYSCALL ENTRY\n"
                   2178: #endif /* DIAGNOSTIC */
                   2179:
                   2180: #if NNPX > 0
                   2181: /*
                   2182:  * Special interrupt handlers.  Someday intr0-intr15 will be used to count
                   2183:  * interrupts.  We'll still need a special exception 16 handler.  The busy
                   2184:  * latch stuff in probintr() can be moved to npxprobe().
                   2185:  */
                   2186:
                   2187: /* LINTSTUB: Func: void probeintr(void) */
                   2188: NENTRY(probeintr)
                   2189:        ss
                   2190:        incl    _C_LABEL(npx_intrs_while_probing)
                   2191:        pushl   %eax
                   2192:        movb    $0x20,%al       # EOI (asm in strings loses cpp features)
                   2193:        outb    %al,$0xa0       # IO_ICU2
                   2194:        outb    %al,$0x20       # IO_ICU1
                   2195:        movb    $0,%al
                   2196:        outb    %al,$0xf0       # clear BUSY# latch
                   2197:        popl    %eax
                   2198:        iret
                   2199:
                   2200: /* LINTSTUB: Func: void probetrap(void) */
                   2201: NENTRY(probetrap)
                   2202:        ss
                   2203:        incl    _C_LABEL(npx_traps_while_probing)
                   2204:        fnclex
                   2205:        iret
                   2206:
                   2207: /* LINTSTUB: Func: int npx586bug1(int a, int b) */
                   2208: NENTRY(npx586bug1)
                   2209:        fildl   4(%esp)         # x
                   2210:        fildl   8(%esp)         # y
                   2211:        fld     %st(1)
                   2212:        fdiv    %st(1),%st      # x/y
                   2213:        fmulp   %st,%st(1)      # (x/y)*y
                   2214:        fsubrp  %st,%st(1)      # x-(x/y)*y
                   2215:        pushl   $0
                   2216:        fistpl  (%esp)
                   2217:        popl    %eax
                   2218:        ret
                   2219: #endif /* NNPX > 0 */

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