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Annotation of src/sys/arch/i386/i386/locore.S, Revision 1.81

1.81    ! ad          1: /*     $NetBSD: locore.S,v 1.80 2008/11/13 10:53:30 ad Exp $   */
1.53      yamt        2:
                      3: /*
                      4:  * Copyright-o-rama!
                      5:  */
                      6:
                      7: /*
1.62      bouyer      8:  * Copyright (c) 2006 Manuel Bouyer.
                      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 Manuel Bouyer.
                     21:  * 4. The name of the author may not be used to endorse or promote products
                     22:  *    derived from this software without specific prior written permission.
                     23:  *
                     24:  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
                     25:  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
                     26:  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
                     27:  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
                     28:  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
                     29:  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
                     30:  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
                     31:  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
                     32:  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
                     33:  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
                     34:  *
                     35:  */
                     36:
                     37: /*
1.53      yamt       38:  * Copyright (c) 2001 Wasabi Systems, Inc.
                     39:  * All rights reserved.
                     40:  *
                     41:  * Written by Frank van der Linden for Wasabi Systems, Inc.
                     42:  *
                     43:  * Redistribution and use in source and binary forms, with or without
                     44:  * modification, are permitted provided that the following conditions
                     45:  * are met:
                     46:  * 1. Redistributions of source code must retain the above copyright
                     47:  *    notice, this list of conditions and the following disclaimer.
                     48:  * 2. Redistributions in binary form must reproduce the above copyright
                     49:  *    notice, this list of conditions and the following disclaimer in the
                     50:  *    documentation and/or other materials provided with the distribution.
                     51:  * 3. All advertising materials mentioning features or use of this software
                     52:  *    must display the following acknowledgement:
                     53:  *      This product includes software developed for the NetBSD Project by
                     54:  *      Wasabi Systems, Inc.
                     55:  * 4. The name of Wasabi Systems, Inc. may not be used to endorse
                     56:  *    or promote products derived from this software without specific prior
                     57:  *    written permission.
                     58:  *
                     59:  * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND
                     60:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
                     61:  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
                     62:  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL WASABI SYSTEMS, INC
                     63:  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
                     64:  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
                     65:  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
                     66:  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
                     67:  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
                     68:  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
                     69:  * POSSIBILITY OF SUCH DAMAGE.
                     70:  */
                     71:
1.1       fvdl       72:
                     73: /*-
1.48      yamt       74:  * Copyright (c) 1998, 2000, 2004, 2006, 2007 The NetBSD Foundation, Inc.
1.1       fvdl       75:  * All rights reserved.
                     76:  *
                     77:  * This code is derived from software contributed to The NetBSD Foundation
                     78:  * by Charles M. Hannum.
                     79:  *
                     80:  * Redistribution and use in source and binary forms, with or without
                     81:  * modification, are permitted provided that the following conditions
                     82:  * are met:
                     83:  * 1. Redistributions of source code must retain the above copyright
                     84:  *    notice, this list of conditions and the following disclaimer.
                     85:  * 2. Redistributions in binary form must reproduce the above copyright
                     86:  *    notice, this list of conditions and the following disclaimer in the
                     87:  *    documentation and/or other materials provided with the distribution.
                     88:  *
                     89:  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
                     90:  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
                     91:  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
                     92:  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
                     93:  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
                     94:  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
                     95:  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
                     96:  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
                     97:  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
                     98:  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
                     99:  * POSSIBILITY OF SUCH DAMAGE.
                    100:  */
                    101:
                    102: /*-
                    103:  * Copyright (c) 1990 The Regents of the University of California.
                    104:  * All rights reserved.
                    105:  *
                    106:  * This code is derived from software contributed to Berkeley by
                    107:  * William Jolitz.
                    108:  *
                    109:  * Redistribution and use in source and binary forms, with or without
                    110:  * modification, are permitted provided that the following conditions
                    111:  * are met:
                    112:  * 1. Redistributions of source code must retain the above copyright
                    113:  *    notice, this list of conditions and the following disclaimer.
                    114:  * 2. Redistributions in binary form must reproduce the above copyright
                    115:  *    notice, this list of conditions and the following disclaimer in the
                    116:  *    documentation and/or other materials provided with the distribution.
1.12      agc       117:  * 3. Neither the name of the University nor the names of its contributors
1.1       fvdl      118:  *    may be used to endorse or promote products derived from this software
                    119:  *    without specific prior written permission.
                    120:  *
                    121:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
                    122:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                    123:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                    124:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
                    125:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                    126:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                    127:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                    128:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                    129:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                    130:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                    131:  * SUCH DAMAGE.
                    132:  *
                    133:  *     @(#)locore.s    7.3 (Berkeley) 5/13/91
                    134:  */
                    135:
1.59      lukem     136: #include <machine/asm.h>
1.81    ! ad        137: __KERNEL_RCSID(0, "$NetBSD: locore.S,v 1.80 2008/11/13 10:53:30 ad Exp $");
1.59      lukem     138:
1.18      christos  139: #include "opt_compat_oldboot.h"
1.1       fvdl      140: #include "opt_ddb.h"
1.78      joerg     141: #include "opt_multiboot.h"
1.1       fvdl      142: #include "opt_realmem.h"
1.18      christos  143: #include "opt_vm86.h"
1.62      bouyer    144: #include "opt_xen.h"
1.1       fvdl      145:
                    146: #include "npx.h"
                    147: #include "assym.h"
                    148: #include "lapic.h"
                    149: #include "ioapic.h"
1.8       fvdl      150: #include "ksyms.h"
1.1       fvdl      151:
                    152: #include <sys/errno.h>
                    153: #include <sys/syscall.h>
                    154:
                    155: #include <machine/cputypes.h>
                    156: #include <machine/segments.h>
                    157: #include <machine/specialreg.h>
                    158: #include <machine/trap.h>
                    159: #include <machine/i82489reg.h>
1.48      yamt      160: #include <machine/frameasm.h>
                    161: #include <machine/i82489reg.h>
1.62      bouyer    162: #ifndef XEN
                    163: #include <machine/multiboot.h>
                    164: #endif
1.1       fvdl      165:
                    166: /* XXX temporary kluge; these should not be here */
                    167: /* Get definitions for IOM_BEGIN, IOM_END, and IOM_SIZE */
                    168: #include <dev/isa/isareg.h>
                    169:
1.62      bouyer    170: #ifdef XEN
                    171: /*
                    172:  * Xen guest identifier and loader selection
                    173:  */
                    174: .section __xen_guest
                    175: #ifdef XEN3
                    176:        .ascii  "GUEST_OS=netbsd,GUEST_VER=3.0,XEN_VER=xen-3.0"
                    177: #if defined(DOM0OPS) || !defined(XEN_COMPAT_030001)
                    178:        .ascii  ",VIRT_BASE=0xc0000000" /* KERNBASE */
                    179:        .ascii  ",ELF_PADDR_OFFSET=0xc0000000" /* KERNBASE */
                    180: #else
                    181:        .ascii  ",VIRT_BASE=0xc0100000" /* KERNTEXTOFF */
                    182:        .ascii  ",ELF_PADDR_OFFSET=0xc0100000" /* KERNTEXTOFF */
                    183: #endif
                    184:        .ascii  ",VIRT_ENTRY=0xc0100000" /* KERNTEXTOFF */
                    185: #if !defined(XEN_COMPAT_030001)
                    186:        .ascii  ",HYPERCALL_PAGE=0x00000101"
                    187:                /* (???+HYPERCALL_PAGE_OFFSET)/PAGE_SIZE) */
                    188: #endif
1.66      bouyer    189: #ifdef PAE
                    190:        .ascii  ",PAE=yes[extended-cr3]"
                    191: #endif
1.62      bouyer    192: #else /* !XEN3 */
                    193:        .ascii  "GUEST_OS=netbsd,GUEST_VER=2.0,XEN_VER=2.0"
                    194: #endif /* XEN3 */
                    195:        .ascii  ",LOADER=generic"
1.80      ad        196: #if (NKSYMS || defined(DDB) || defined(MODULAR)) && !defined(SYMTAB_SPACE)
1.62      bouyer    197:        .ascii  ",BSD_SYMTAB=yes"
                    198: #endif
                    199:        .byte   0
                    200: #endif
                    201:
1.1       fvdl      202: /*
                    203:  * Initialization
                    204:  */
                    205:        .data
                    206:
                    207:        .globl  _C_LABEL(cpu)
1.73      ad        208:        .globl  _C_LABEL(cpuid_level)
1.38      jmmv      209:        .globl  _C_LABEL(esym)
1.71      ad        210:        .globl  _C_LABEL(eblob)
1.38      jmmv      211:        .globl  _C_LABEL(atdevbase)
1.40      yamt      212:        .globl  _C_LABEL(proc0uarea),_C_LABEL(PDPpaddr)
1.1       fvdl      213:        .globl  _C_LABEL(gdt)
                    214:        .globl  _C_LABEL(idt)
1.30      junyoung  215:        .globl  _C_LABEL(lapic_tpr)
                    216:
1.1       fvdl      217: #if NLAPIC > 0
                    218: #ifdef __ELF__
1.7       thorpej   219:        .align  PAGE_SIZE
1.1       fvdl      220: #else
                    221:        .align  12
                    222: #endif
                    223:        .globl _C_LABEL(local_apic), _C_LABEL(lapic_id)
                    224: _C_LABEL(local_apic):
                    225:        .space  LAPIC_ID
1.30      junyoung  226: _C_LABEL(lapic_id):
1.1       fvdl      227:        .long   0x00000000
                    228:        .space  LAPIC_TPRI-(LAPIC_ID+4)
1.30      junyoung  229: _C_LABEL(lapic_tpr):
1.1       fvdl      230:        .space  LAPIC_PPRI-LAPIC_TPRI
1.30      junyoung  231: _C_LABEL(lapic_ppr):
1.1       fvdl      232:        .space  LAPIC_ISR-LAPIC_PPRI
                    233: _C_LABEL(lapic_isr):
1.7       thorpej   234:        .space  PAGE_SIZE-LAPIC_ISR
1.1       fvdl      235: #else
1.30      junyoung  236: _C_LABEL(lapic_tpr):
1.1       fvdl      237:        .long 0
                    238: #endif
1.30      junyoung  239:
1.48      yamt      240: _C_LABEL(cpu):         .long   0       # are we 80486, Pentium, or..
1.73      ad        241: _C_LABEL(cpuid_level): .long   0
1.1       fvdl      242: _C_LABEL(atdevbase):   .long   0       # location of start of iomem in virtual
1.40      yamt      243: _C_LABEL(proc0uarea):  .long   0
1.31      junyoung  244: _C_LABEL(PDPpaddr):    .long   0       # paddr of PDP, for libkvm
1.53      yamt      245: _C_LABEL(tablesize):   .long   0
1.30      junyoung  246:
1.63      bouyer    247:        .space 512
1.1       fvdl      248: tmpstk:
                    249:
1.62      bouyer    250: #ifndef XEN
1.35      yamt      251: #define        _RELOC(x)       ((x) - KERNBASE)
1.62      bouyer    252: #else
                    253: #define        _RELOC(x)       ((x))
                    254: #endif /* XEN */
1.1       fvdl      255: #define        RELOC(x)        _RELOC(_C_LABEL(x))
                    256:
                    257:        .text
                    258:        .globl  _C_LABEL(kernel_text)
                    259:        .set    _C_LABEL(kernel_text),KERNTEXTOFF
                    260:
                    261:        .globl  start
1.62      bouyer    262: #ifndef XEN
1.1       fvdl      263: start: movw    $0x1234,0x472                   # warm boot
                    264:
1.37      jmmv      265: #if defined(MULTIBOOT)
                    266:        jmp     1f
                    267:
                    268:        .align  4
                    269:        .globl  Multiboot_Header
                    270: _C_LABEL(Multiboot_Header):
1.44      jmmv      271: #define MULTIBOOT_HEADER_FLAGS (MULTIBOOT_HEADER_WANT_MEMORY)
1.37      jmmv      272:        .long   MULTIBOOT_HEADER_MAGIC
                    273:        .long   MULTIBOOT_HEADER_FLAGS
                    274:        .long   -(MULTIBOOT_HEADER_MAGIC + MULTIBOOT_HEADER_FLAGS)
                    275:
                    276: 1:
                    277:        /* Check if we are being executed by a Multiboot-compliant boot
                    278:         * loader. */
                    279:        cmpl    $MULTIBOOT_INFO_MAGIC,%eax
                    280:        jne     1f
                    281:
1.43      mrg       282:        /*
                    283:         * Indeed, a multiboot-compliant boot loader executed us.  We copy
1.37      jmmv      284:         * the received Multiboot information structure into kernel's data
                    285:         * space to process it later -- after we are relocated.  It will
1.43      mrg       286:         * be safer to run complex C code than doing it at this point.
                    287:         */
1.37      jmmv      288:        pushl   %ebx            # Address of Multiboot information
                    289:        call    _C_LABEL(multiboot_pre_reloc)
                    290:        addl    $4,%esp
1.38      jmmv      291:        jmp     2f
1.37      jmmv      292: #endif
                    293:
                    294: 1:
1.1       fvdl      295:        /*
1.38      jmmv      296:         * At this point, we know that a NetBSD-specific boot loader
                    297:         * booted this kernel.  The stack carries the following parameters:
1.41      jmmv      298:         * (boothowto, [bootdev], bootinfo, esym, biosextmem, biosbasemem),
1.38      jmmv      299:         * 4 bytes each.
1.1       fvdl      300:         */
1.38      jmmv      301:        addl    $4,%esp         # Discard return address to boot loader
                    302:        call    _C_LABEL(native_loader)
                    303:        addl    $24,%esp
1.1       fvdl      304:
                    305: 2:
                    306:        /* First, reset the PSL. */
                    307:        pushl   $PSL_MBO
                    308:        popfl
                    309:
                    310:        /* Clear segment registers; always null in proc0. */
                    311:        xorl    %eax,%eax
                    312:        movw    %ax,%fs
                    313:        movw    %ax,%gs
                    314:        decl    %eax
1.73      ad        315:        movl    %eax,RELOC(cpuid_level)
1.1       fvdl      316:
                    317:        /* Find out our CPU type. */
                    318:
                    319: try386:        /* Try to toggle alignment check flag; does not exist on 386. */
                    320:        pushfl
                    321:        popl    %eax
                    322:        movl    %eax,%ecx
                    323:        orl     $PSL_AC,%eax
                    324:        pushl   %eax
                    325:        popfl
                    326:        pushfl
                    327:        popl    %eax
                    328:        xorl    %ecx,%eax
                    329:        andl    $PSL_AC,%eax
                    330:        pushl   %ecx
                    331:        popfl
                    332:
                    333:        testl   %eax,%eax
                    334:        jnz     try486
                    335:
                    336:        /*
                    337:         * Try the test of a NexGen CPU -- ZF will not change on a DIV
                    338:         * instruction on a NexGen, it will on an i386.  Documented in
                    339:         * Nx586 Processor Recognition Application Note, NexGen, Inc.
                    340:         */
                    341:        movl    $0x5555,%eax
                    342:        xorl    %edx,%edx
                    343:        movl    $2,%ecx
                    344:        divl    %ecx
                    345:        jnz     is386
                    346:
                    347: isnx586:
                    348:        /*
                    349:         * Don't try cpuid, as Nx586s reportedly don't support the
                    350:         * PSL_ID bit.
                    351:         */
                    352:        movl    $CPU_NX586,RELOC(cpu)
                    353:        jmp     2f
                    354:
                    355: is386:
                    356:        movl    $CPU_386,RELOC(cpu)
                    357:        jmp     2f
                    358:
                    359: try486:        /* Try to toggle identification flag; does not exist on early 486s. */
                    360:        pushfl
                    361:        popl    %eax
                    362:        movl    %eax,%ecx
                    363:        xorl    $PSL_ID,%eax
                    364:        pushl   %eax
                    365:        popfl
                    366:        pushfl
                    367:        popl    %eax
                    368:        xorl    %ecx,%eax
                    369:        andl    $PSL_ID,%eax
                    370:        pushl   %ecx
                    371:        popfl
                    372:
                    373:        testl   %eax,%eax
                    374:        jnz     try586
                    375: is486: movl    $CPU_486,RELOC(cpu)
                    376:        /*
                    377:         * Check Cyrix CPU
                    378:         * Cyrix CPUs do not change the undefined flags following
                    379:         * execution of the divide instruction which divides 5 by 2.
                    380:         *
                    381:         * Note: CPUID is enabled on M2, so it passes another way.
                    382:         */
                    383:        pushfl
                    384:        movl    $0x5555, %eax
                    385:        xorl    %edx, %edx
                    386:        movl    $2, %ecx
                    387:        clc
                    388:        divl    %ecx
                    389:        jnc     trycyrix486
                    390:        popfl
                    391:        jmp 2f
                    392: trycyrix486:
                    393:        movl    $CPU_6x86,RELOC(cpu)    # set CPU type
                    394:        /*
                    395:         * Check for Cyrix 486 CPU by seeing if the flags change during a
                    396:         * divide. This is documented in the Cx486SLC/e SMM Programmer's
                    397:         * Guide.
                    398:         */
                    399:        xorl    %edx,%edx
                    400:        cmpl    %edx,%edx               # set flags to known state
                    401:        pushfl
                    402:        popl    %ecx                    # store flags in ecx
                    403:        movl    $-1,%eax
                    404:        movl    $4,%ebx
                    405:        divl    %ebx                    # do a long division
                    406:        pushfl
                    407:        popl    %eax
                    408:        xorl    %ecx,%eax               # are the flags different?
                    409:        testl   $0x8d5,%eax             # only check C|PF|AF|Z|N|V
                    410:        jne     2f                      # yes; must be Cyrix 6x86 CPU
                    411:        movl    $CPU_486DLC,RELOC(cpu)  # set CPU type
                    412:
                    413: #ifndef CYRIX_CACHE_WORKS
                    414:        /* Disable caching of the ISA hole only. */
                    415:        invd
                    416:        movb    $CCR0,%al               # Configuration Register index (CCR0)
                    417:        outb    %al,$0x22
                    418:        inb     $0x23,%al
                    419:        orb     $(CCR0_NC1|CCR0_BARB),%al
                    420:        movb    %al,%ah
                    421:        movb    $CCR0,%al
                    422:        outb    %al,$0x22
                    423:        movb    %ah,%al
                    424:        outb    %al,$0x23
                    425:        invd
                    426: #else /* CYRIX_CACHE_WORKS */
                    427:        /* Set cache parameters */
                    428:        invd                            # Start with guaranteed clean cache
                    429:        movb    $CCR0,%al               # Configuration Register index (CCR0)
                    430:        outb    %al,$0x22
                    431:        inb     $0x23,%al
                    432:        andb    $~CCR0_NC0,%al
                    433: #ifndef CYRIX_CACHE_REALLY_WORKS
                    434:        orb     $(CCR0_NC1|CCR0_BARB),%al
                    435: #else
                    436:        orb     $CCR0_NC1,%al
                    437: #endif
                    438:        movb    %al,%ah
                    439:        movb    $CCR0,%al
                    440:        outb    %al,$0x22
                    441:        movb    %ah,%al
                    442:        outb    %al,$0x23
                    443:        /* clear non-cacheable region 1 */
                    444:        movb    $(NCR1+2),%al
                    445:        outb    %al,$0x22
                    446:        movb    $NCR_SIZE_0K,%al
                    447:        outb    %al,$0x23
                    448:        /* clear non-cacheable region 2 */
                    449:        movb    $(NCR2+2),%al
                    450:        outb    %al,$0x22
                    451:        movb    $NCR_SIZE_0K,%al
                    452:        outb    %al,$0x23
                    453:        /* clear non-cacheable region 3 */
                    454:        movb    $(NCR3+2),%al
                    455:        outb    %al,$0x22
                    456:        movb    $NCR_SIZE_0K,%al
                    457:        outb    %al,$0x23
                    458:        /* clear non-cacheable region 4 */
                    459:        movb    $(NCR4+2),%al
                    460:        outb    %al,$0x22
                    461:        movb    $NCR_SIZE_0K,%al
                    462:        outb    %al,$0x23
                    463:        /* enable caching in CR0 */
                    464:        movl    %cr0,%eax
                    465:        andl    $~(CR0_CD|CR0_NW),%eax
                    466:        movl    %eax,%cr0
                    467:        invd
                    468: #endif /* CYRIX_CACHE_WORKS */
                    469:
                    470:        jmp     2f
                    471:
                    472: try586:        /* Use the `cpuid' instruction. */
                    473:        xorl    %eax,%eax
                    474:        cpuid
1.73      ad        475:        movl    %eax,RELOC(cpuid_level)
1.1       fvdl      476:
                    477: 2:
                    478:        /*
                    479:         * Finished with old stack; load new %esp now instead of later so we
                    480:         * can trace this code without having to worry about the trace trap
                    481:         * clobbering the memory test or the zeroing of the bss+bootstrap page
                    482:         * tables.
                    483:         *
                    484:         * The boot program should check:
                    485:         *      text+data <= &stack_variable - more_space_for_stack
                    486:         *      text+data+bss+pad+space_for_page_tables <= end_of_memory
                    487:         * Oops, the gdt is in the carcass of the boot program so clearing
                    488:         * the rest of memory is still not possible.
                    489:         */
                    490:        movl    $_RELOC(tmpstk),%esp    # bootstrap stack end location
                    491:
                    492: /*
                    493:  * Virtual address space of kernel:
                    494:  *
1.71      ad        495:  * text | data | bss | [syms] | [blobs] | page dir | proc0 kstack | L1 ptp
                    496:  *                                     0          1       2      3
1.1       fvdl      497:  */
1.53      yamt      498:
                    499: #define        PROC0_PDIR_OFF  0
                    500: #define        PROC0_STK_OFF   (PROC0_PDIR_OFF + PAGE_SIZE)
                    501: #define        PROC0_PTP1_OFF  (PROC0_STK_OFF + UPAGES * PAGE_SIZE)
                    502:
                    503: /*
                    504:  * fillkpt
                    505:  *     eax = pte (page frame | control | status)
                    506:  *     ebx = page table address
                    507:  *     ecx = number of pages to map
                    508:  */
                    509:
                    510: #define fillkpt        \
                    511: 1:     movl    %eax,(%ebx)     ;       /* store phys addr */ \
                    512:        addl    $4,%ebx         ;       /* next pte/pde */ \
                    513:        addl    $PAGE_SIZE,%eax ;       /* next phys page */ \
                    514:        loop    1b              ;  \
                    515:
1.1       fvdl      516:
                    517:        /* Find end of kernel image. */
                    518:        movl    $RELOC(end),%edi
1.71      ad        519:
1.80      ad        520: #if (NKSYMS || defined(DDB) || defined(MODULAR)) && !defined(SYMTAB_SPACE)
1.1       fvdl      521:        /* Save the symbols (if loaded). */
                    522:        movl    RELOC(esym),%eax
                    523:        testl   %eax,%eax
                    524:        jz      1f
1.35      yamt      525:        subl    $KERNBASE,%eax
1.1       fvdl      526:        movl    %eax,%edi
                    527: 1:
                    528: #endif
                    529:
1.71      ad        530:        /* Skip over any modules/blobs. */
                    531:        movl    RELOC(eblob),%eax
                    532:        testl   %eax,%eax
                    533:        jz      1f
                    534:        subl    $KERNBASE,%eax
                    535:        movl    %eax,%edi
                    536: 1:
1.53      yamt      537:        /* Compute sizes */
1.71      ad        538:        movl    %edi,%esi
1.1       fvdl      539:        addl    $PGOFSET,%esi                   # page align up
                    540:        andl    $~PGOFSET,%esi
                    541:
1.53      yamt      542:        /* nkptp[1] = (esi + ~L2_FRAME) >> L2_SHIFT + 1; */
                    543:        movl    %esi,%eax
                    544:        addl    $~L2_FRAME,%eax
                    545:        shrl    $L2_SHIFT,%eax
                    546:        incl    %eax            /* one more ptp for VAs stolen by bootstrap */
                    547: 1:     movl    %eax,RELOC(nkptp)+1*4
                    548:
                    549:        /* tablesize = (1 + UPAGES + nkptp) << PGSHIFT; */
                    550:        addl    $(1+UPAGES),%eax
                    551:        shll    $PGSHIFT,%eax
                    552:        movl    %eax,RELOC(tablesize)
                    553:
                    554:        /* ensure that nkptp covers bootstrap tables */
                    555:        addl    %esi,%eax
                    556:        addl    $~L2_FRAME,%eax
                    557:        shrl    $L2_SHIFT,%eax
                    558:        incl    %eax
                    559:        cmpl    %eax,RELOC(nkptp)+1*4
                    560:        jnz     1b
                    561:
                    562:        /* Clear tables */
                    563:        movl    %esi,%edi
1.1       fvdl      564:        xorl    %eax,%eax
                    565:        cld
1.53      yamt      566:        movl    RELOC(tablesize),%ecx
                    567:        shrl    $2,%ecx
1.1       fvdl      568:        rep
                    569:        stosl
                    570:
1.53      yamt      571:        leal    (PROC0_PTP1_OFF)(%esi), %ebx
1.1       fvdl      572:
                    573: /*
                    574:  * Build initial page tables.
                    575:  */
1.53      yamt      576:        /*
                    577:         * Compute &__data_start - KERNBASE. This can't be > 4G,
                    578:         * or we can't deal with it anyway, since we can't load it in
                    579:         * 32 bit mode. So use the bottom 32 bits.
                    580:         */
                    581:        movl    $RELOC(__data_start),%edx
1.1       fvdl      582:        andl    $~PGOFSET,%edx
1.30      junyoung  583:
1.53      yamt      584:        /*
                    585:         * Skip the first MB.
                    586:         */
1.1       fvdl      587:        movl    $_RELOC(KERNTEXTOFF),%eax
                    588:        movl    %eax,%ecx
1.53      yamt      589:        shrl    $(PGSHIFT-2),%ecx       /* ((n >> PGSHIFT) << 2) for # pdes */
                    590:        addl    %ecx,%ebx
1.1       fvdl      591:
                    592:        /* Map the kernel text read-only. */
                    593:        movl    %edx,%ecx
                    594:        subl    %eax,%ecx
                    595:        shrl    $PGSHIFT,%ecx
                    596:        orl     $(PG_V|PG_KR),%eax
                    597:        fillkpt
                    598:
                    599:        /* Map the data, BSS, and bootstrap tables read-write. */
                    600:        leal    (PG_V|PG_KW)(%edx),%eax
1.53      yamt      601:        movl    RELOC(tablesize),%ecx
1.1       fvdl      602:        addl    %esi,%ecx                               # end of tables
                    603:        subl    %edx,%ecx                               # subtract end of text
                    604:        shrl    $PGSHIFT,%ecx
                    605:        fillkpt
                    606:
1.53      yamt      607:        /* Map ISA I/O mem (later atdevbase) */
1.1       fvdl      608:        movl    $(IOM_BEGIN|PG_V|PG_KW/*|PG_N*/),%eax   # having these bits set
                    609:        movl    $(IOM_SIZE>>PGSHIFT),%ecx               # for this many pte s,
                    610:        fillkpt
                    611:
                    612: /*
                    613:  * Construct a page table directory.
                    614:  */
1.53      yamt      615:        /* Set up top level entries for identity mapping */
                    616:        leal    (PROC0_PDIR_OFF)(%esi),%ebx
                    617:        leal    (PROC0_PTP1_OFF)(%esi),%eax
                    618:        orl     $(PG_V|PG_KW), %eax
                    619:        movl    RELOC(nkptp)+1*4,%ecx
1.1       fvdl      620:        fillkpt
                    621:
1.53      yamt      622:        /* Set up top level entries for actual kernel mapping */
                    623:        leal    (PROC0_PDIR_OFF + L2_SLOT_KERNBASE*4)(%esi),%ebx
                    624:        leal    (PROC0_PTP1_OFF)(%esi),%eax
                    625:        orl     $(PG_V|PG_KW), %eax
                    626:        movl    RELOC(nkptp)+1*4,%ecx
1.1       fvdl      627:        fillkpt
                    628:
                    629:        /* Install a PDE recursively mapping page directory as a page table! */
1.53      yamt      630:        leal    (PROC0_PDIR_OFF + PDIR_SLOT_PTE*4)(%esi),%ebx
                    631:        leal    (PROC0_PDIR_OFF)(%esi),%eax
                    632:        orl     $(PG_V|PG_KW),%eax
                    633:        movl    %eax,(%ebx)
                    634:
1.1       fvdl      635:
1.31      junyoung  636:        /* Save phys. addr of PDP, for libkvm. */
                    637:        movl    %esi,RELOC(PDPpaddr)
1.1       fvdl      638:
1.53      yamt      639:        /*
                    640:         * Startup checklist:
                    641:         * 1. Load %cr3 with pointer to PDIR.
                    642:         */
1.1       fvdl      643:        movl    %esi,%eax               # phys address of ptd in proc 0
                    644:        movl    %eax,%cr3               # load ptd addr into mmu
1.53      yamt      645:
                    646:        /*
                    647:         * 2. Enable paging and the rest of it.
                    648:         */
1.1       fvdl      649:        movl    %cr0,%eax               # get control word
                    650:                                        # enable paging & NPX emulation
                    651:        orl     $(CR0_PE|CR0_PG|CR0_NE|CR0_TS|CR0_EM|CR0_MP),%eax
1.77      gmcgarry  652:        movl    %eax,%cr0               # and page NOW!
1.1       fvdl      653:
                    654:        pushl   $begin                  # jump to high mem
                    655:        ret
                    656:
                    657: begin:
1.53      yamt      658:        /*
                    659:         * We have arrived.
                    660:         * There's no need anymore for the identity mapping in low
                    661:         * memory, remove it.
                    662:         */
                    663:        movl    _C_LABEL(nkptp)+1*4,%ecx
                    664:        leal    (PROC0_PDIR_OFF)(%esi),%ebx     # old, phys  address of PDIR
                    665:        addl    $(KERNBASE), %ebx       # new, virtual address of PDIR
1.1       fvdl      666: 1:     movl    $0,(%ebx)
1.53      yamt      667:        addl    $4,%ebx
1.1       fvdl      668:        loop    1b
                    669:
                    670:        /* Relocate atdevbase. */
1.53      yamt      671:        movl    $KERNBASE,%edx
                    672:        addl    _C_LABEL(tablesize),%edx
1.1       fvdl      673:        addl    %esi,%edx
                    674:        movl    %edx,_C_LABEL(atdevbase)
                    675:
                    676:        /* Set up bootstrap stack. */
1.53      yamt      677:        leal    (PROC0_STK_OFF+KERNBASE)(%esi),%eax
1.40      yamt      678:        movl    %eax,_C_LABEL(proc0uarea)
                    679:        leal    (KSTACK_SIZE-FRAMESIZE)(%eax),%esp
                    680:        movl    %esi,(KSTACK_SIZE+PCB_CR3)(%eax)        # pcb->pcb_cr3
1.1       fvdl      681:        xorl    %ebp,%ebp               # mark end of frames
                    682:
1.37      jmmv      683: #if defined(MULTIBOOT)
                    684:        /* It is now safe to parse the Multiboot information structure
                    685:         * we saved before from C code.  Note that we cannot delay its
                    686:         * parsing any more because initgdt (called below) needs to make
                    687:         * use of this information. */
                    688:        call    _C_LABEL(multiboot_post_reloc)
                    689: #endif
                    690:
1.1       fvdl      691:        subl    $NGDT*8, %esp           # space for temporary gdt
                    692:        pushl   %esp
                    693:        call    _C_LABEL(initgdt)
                    694:        addl    $4,%esp
1.30      junyoung  695:
1.53      yamt      696:        movl    _C_LABEL(tablesize),%eax
1.1       fvdl      697:        addl    %esi,%eax               # skip past stack and page tables
                    698:
                    699:        pushl   %eax
                    700:        call    _C_LABEL(init386)       # wire 386 chip for unix operation
                    701:        addl    $4+NGDT*8,%esp          # pop temporary gdt
                    702:
                    703: #ifdef SAFARI_FIFO_HACK
                    704:        movb    $5,%al
                    705:        movw    $0x37b,%dx
                    706:        outb    %al,%dx
                    707:        movw    $0x37f,%dx
                    708:        inb     %dx,%al
                    709:        movb    %al,%cl
                    710:
                    711:        orb     $1,%cl
                    712:
                    713:        movb    $5,%al
                    714:        movw    $0x37b,%dx
                    715:        outb    %al,%dx
                    716:        movw    $0x37f,%dx
                    717:        movb    %cl,%al
                    718:        outb    %al,%dx
                    719: #endif /* SAFARI_FIFO_HACK */
                    720:
                    721:        call    _C_LABEL(main)
1.62      bouyer    722: #else /* XEN */
                    723: start:
                    724:        /* First, reset the PSL. */
                    725:        pushl   $PSL_MBO
                    726:        popfl
                    727:
                    728:        cld
                    729: #ifdef XEN3
                    730:        movl    %esp, %ebx              # save start of available space
                    731: #else
                    732:        movl    %esi,%ebx               # save start_info pointer
                    733: #endif
                    734:        movl    $_RELOC(tmpstk),%esp    # bootstrap stack end location
                    735:
                    736:         /* Clear BSS first so that there are no surprises... */
                    737:        xorl    %eax,%eax
                    738:        movl    $RELOC(__bss_start),%edi
                    739:        movl    $RELOC(_end),%ecx
                    740:        subl    %edi,%ecx
                    741:        rep stosb
                    742:
                    743:        /* Copy the necessary stuff from start_info structure. */
                    744:         /* We need to copy shared_info early, so that sti/cli work */
                    745:        movl    $RELOC(start_info_union),%edi
                    746:        movl    $128,%ecx
                    747:        rep movsl
                    748:
                    749:        /* Clear segment registers; always null in proc0. */
                    750:        xorl    %eax,%eax
                    751:        movw    %ax,%fs
                    752:        movw    %ax,%gs
                    753:        decl    %eax
1.73      ad        754:        movl    %eax,RELOC(cpuid_level)
1.62      bouyer    755:
                    756:        xorl    %eax,%eax
                    757:        cpuid
1.73      ad        758:        movl    %eax,RELOC(cpuid_level)
1.62      bouyer    759:
                    760:        call    xen_pmap_bootstrap
                    761:        /*
                    762:         * First avail returned by xen_pmap_bootstrap in %eax
                    763:         */
                    764:        movl    %eax, %esi;
                    765:        movl    %esi, _C_LABEL(proc0uarea)
                    766:
                    767: #define PROC0PDIR       ((0)              * PAGE_SIZE)
                    768: #define PROC0STACK      ((1)              * PAGE_SIZE)
                    769:
                    770:        /* Set up bootstrap stack. */
                    771:        leal    (KSTACK_SIZE-FRAMESIZE)(%eax),%esp
                    772:        xorl    %ebp,%ebp               # mark end of frames
                    773:
                    774:        addl    $USPACE, %esi
                    775:        subl    $KERNBASE, %esi         #init386 want a physical address
                    776:        pushl   %esi
                    777:        call    _C_LABEL(init386)       # wire 386 chip for unix operation
                    778:        addl    $4,%esp
                    779:        call    _C_LABEL(main)
                    780:
                    781: #if defined(XEN3) && !defined(XEN_COMPAT_030001)
                    782: /* space for the hypercall call page */
                    783: #define HYPERCALL_PAGE_OFFSET 0x1000
                    784: .org HYPERCALL_PAGE_OFFSET
                    785: ENTRY(hypercall_page)
                    786: .skip 0x1000
                    787: #endif /* defined(XEN3) && !defined(XEN_COMPAT_030001) */
                    788:
                    789: /*
                    790:  * void lgdt_finish(void);
                    791:  * Finish load a new GDT pointer (do any necessary cleanup).
                    792:  * XXX It's somewhat questionable whether reloading all the segment registers
                    793:  * is necessary, since the actual descriptor data is not changed except by
                    794:  * process creation and exit, both of which clean up via task switches.  OTOH,
                    795:  * this only happens at run time when the GDT is resized.
                    796:  */
                    797: /* LINTSTUB: Func: void lgdt_finish(void) */
                    798: NENTRY(lgdt_finish)
                    799:        movl    $GSEL(GDATA_SEL, SEL_KPL),%eax
                    800:        movw    %ax,%ds
                    801:        movw    %ax,%es
                    802:        movw    %ax,%gs
                    803:        movw    %ax,%ss
                    804:        movl    $GSEL(GCPU_SEL, SEL_KPL),%eax
                    805:        movw    %ax,%fs
                    806:        /* Reload code selector by doing intersegment return. */
                    807:        popl    %eax
                    808:        pushl   $GSEL(GCODE_SEL, SEL_KPL)
                    809:        pushl   %eax
                    810:        lret
1.72      yamt      811: END(lgdt_finish)
1.62      bouyer    812:
                    813: #endif /* XEN */
1.1       fvdl      814:
                    815: /*
1.48      yamt      816:  * void lwp_trampoline(void);
                    817:  *
1.1       fvdl      818:  * This is a trampoline function pushed onto the stack of a newly created
                    819:  * process in order to do some additional setup.  The trampoline is entered by
                    820:  * cpu_switch()ing to the process, so we abuse the callee-saved registers used
                    821:  * by cpu_switch() to store the information about the stub to call.
                    822:  * NOTE: This function does not have a normal calling sequence!
                    823:  */
1.48      yamt      824: NENTRY(lwp_trampoline)
1.68      ad        825:        movl    %ebp,%edi       /* for .Lsyscall_checkast */
1.48      yamt      826:        xorl    %ebp,%ebp
1.68      ad        827:        pushl   %edi
1.48      yamt      828:        pushl   %eax
                    829:        call    _C_LABEL(lwp_startup)
                    830:        addl    $8,%esp
1.1       fvdl      831:        pushl   %ebx
                    832:        call    *%esi
                    833:        addl    $4,%esp
1.68      ad        834:        jmp     .Lsyscall_checkast
1.1       fvdl      835:        /* NOTREACHED */
1.72      yamt      836: END(lwp_trampoline)
1.1       fvdl      837:
                    838: /*
1.48      yamt      839:  * sigcode()
                    840:  *
                    841:  * Signal trampoline; copied to top of user stack.  Used only for
                    842:  * compatibility with old releases of NetBSD.
1.1       fvdl      843:  */
                    844: NENTRY(sigcode)
                    845:        /*
                    846:         * Handler has returned here as if we called it.  The sigcontext
                    847:         * is on the stack after the 3 args "we" pushed.
                    848:         */
                    849:        leal    12(%esp),%eax           # get pointer to sigcontext
                    850:        movl    %eax,4(%esp)            # put it in the argument slot
                    851:                                        # fake return address already there
1.17      christos  852:        movl    $SYS_compat_16___sigreturn14,%eax
1.1       fvdl      853:        int     $0x80                   # enter kernel with args on stack
                    854:        movl    $SYS_exit,%eax
                    855:        int     $0x80                   # exit if sigreturn fails
                    856:        .globl  _C_LABEL(esigcode)
                    857: _C_LABEL(esigcode):
1.72      yamt      858: END(sigcode)
1.1       fvdl      859:
                    860: /*
1.48      yamt      861:  * int setjmp(label_t *)
                    862:  *
                    863:  * Used primarily by DDB.
1.1       fvdl      864:  */
                    865: ENTRY(setjmp)
                    866:        movl    4(%esp),%eax
                    867:        movl    %ebx,(%eax)             # save ebx
                    868:        movl    %esp,4(%eax)            # save esp
                    869:        movl    %ebp,8(%eax)            # save ebp
                    870:        movl    %esi,12(%eax)           # save esi
                    871:        movl    %edi,16(%eax)           # save edi
                    872:        movl    (%esp),%edx             # get rta
                    873:        movl    %edx,20(%eax)           # save eip
1.48      yamt      874:        xorl    %eax,%eax               # return 0
1.1       fvdl      875:        ret
1.72      yamt      876: END(setjmp)
1.1       fvdl      877:
1.48      yamt      878: /*
                    879:  * int longjmp(label_t *)
                    880:  *
                    881:  * Used primarily by DDB.
                    882:  */
1.1       fvdl      883: ENTRY(longjmp)
                    884:        movl    4(%esp),%eax
                    885:        movl    (%eax),%ebx             # restore ebx
                    886:        movl    4(%eax),%esp            # restore esp
                    887:        movl    8(%eax),%ebp            # restore ebp
                    888:        movl    12(%eax),%esi           # restore esi
                    889:        movl    16(%eax),%edi           # restore edi
                    890:        movl    20(%eax),%edx           # get rta
                    891:        movl    %edx,(%esp)             # put in return frame
1.48      yamt      892:        movl    $1,%eax                 # return 1
1.1       fvdl      893:        ret
1.72      yamt      894: END(longjmp)
1.1       fvdl      895:
1.65      skrll     896: /*
                    897:  * void dumpsys(void)
                    898:  *
                    899:  * Mimic cpu_switchto() for postmortem debugging.
                    900:  */
1.64      skrll     901: ENTRY(dumpsys)
1.65      skrll     902:        pushl   %ebx                    # set up fake switchframe
                    903:        pushl   %esi                    #   and save context
                    904:        pushl   %edi
                    905:        movl    %esp,_C_LABEL(dumppcb)+PCB_ESP
                    906:        movl    %ebp,_C_LABEL(dumppcb)+PCB_EBP
                    907:        call    _C_LABEL(dodumpsys)     # dump!
                    908:        addl    $(3*4), %esp            # unwind switchframe
1.64      skrll     909:        ret
1.72      yamt      910: END(dumpsys)
1.64      skrll     911:
1.1       fvdl      912: /*
1.79      ad        913:  * struct lwp *cpu_switchto(struct lwp *oldlwp, struct *newlwp,
1.58      ad        914:  *                         bool returning)
1.30      junyoung  915:  *
1.48      yamt      916:  *     1. if (oldlwp != NULL), save its context.
                    917:  *     2. then, restore context of newlwp.
                    918:  *
                    919:  * Note that the stack frame layout is known to "struct switchframe" in
                    920:  * <machine/frame.h> and to the code in cpu_lwp_fork() which initializes
1.5       thorpej   921:  * it for a new lwp.
1.1       fvdl      922:  */
1.48      yamt      923: ENTRY(cpu_switchto)
1.1       fvdl      924:        pushl   %ebx
                    925:        pushl   %esi
                    926:        pushl   %edi
                    927:
1.70      ad        928: #if defined(DIAGNOSTIC) && !defined(XEN)
                    929:        cmpl    $IPL_SCHED,CPUVAR(ILEVEL)
                    930:        jbe     0f
1.74      christos  931:        pushl   CPUVAR(ILEVEL)
1.70      ad        932:        pushl   $.Lstr
                    933:        call    _C_LABEL(panic)
1.74      christos  934:        addl    $8,%esp
                    935: .Lstr: .string "cpu_switchto: switching above IPL_SCHED (%d)\0"
1.70      ad        936: 0:
                    937: #endif
                    938:
1.48      yamt      939:        movl    16(%esp),%esi           # oldlwp
                    940:        movl    20(%esp),%edi           # newlwp
1.58      ad        941:        movl    24(%esp),%edx           # returning
1.48      yamt      942:        testl   %esi,%esi
                    943:        jz      1f
1.1       fvdl      944:
1.48      yamt      945:        /* Save old context. */
                    946:        movl    L_ADDR(%esi),%eax
                    947:        movl    %esp,PCB_ESP(%eax)
                    948:        movl    %ebp,PCB_EBP(%eax)
                    949:
                    950:        /* Switch to newlwp's stack. */
                    951: 1:     movl    L_ADDR(%edi),%ebx
                    952:        movl    PCB_EBP(%ebx),%ebp
                    953:        movl    PCB_ESP(%ebx),%esp
1.1       fvdl      954:
1.61      ad        955:        /*
                    956:         * Set curlwp.  This must be globally visible in order to permit
                    957:         * non-interlocked mutex release.
                    958:         */
                    959:        movl    %edi,%ecx
                    960:        xchgl   %ecx,CPUVAR(CURLWP)
1.58      ad        961:
                    962:        /* Skip the rest if returning to a pinned LWP. */
                    963:        testl   %edx,%edx
                    964:        jnz     4f
                    965:
1.62      bouyer    966: #ifdef XEN
                    967:        pushl   %edi
                    968:        call    _C_LABEL(i386_switch_context)
                    969:        addl    $4,%esp
                    970: #else /* XEN */
1.60      yamt      971:        /* Switch ring0 esp */
                    972:        movl    PCB_ESP0(%ebx),%eax
                    973:        movl    %eax,CPUVAR(ESP0)
1.1       fvdl      974:
                    975:        /* Don't bother with the rest if switching to a system process. */
1.48      yamt      976:        testl   $LW_SYSTEM,L_FLAG(%edi)
                    977:        jnz     4f
1.1       fvdl      978:
1.54      ad        979:        /* Restore thread-private %fs/%gs descriptors. */
1.60      yamt      980:        movl    CPUVAR(GDT),%ecx
1.55      ad        981:        movl    PCB_FSD(%ebx), %eax
                    982:        movl    PCB_FSD+4(%ebx), %edx
1.54      ad        983:        movl    %eax, (GUFS_SEL*8)(%ecx)
                    984:        movl    %edx, (GUFS_SEL*8+4)(%ecx)
1.55      ad        985:        movl    PCB_GSD(%ebx), %eax
                    986:        movl    PCB_GSD+4(%ebx), %edx
1.54      ad        987:        movl    %eax, (GUGS_SEL*8)(%ecx)
                    988:        movl    %edx, (GUGS_SEL*8+4)(%ecx)
1.62      bouyer    989: #endif /* XEN */
1.54      ad        990:
1.60      yamt      991:        /* Switch I/O bitmap */
                    992:        movl    PCB_IOMAP(%ebx),%eax
                    993:        orl     %eax,%eax
                    994:        jnz,pn  .Lcopy_iobitmap
                    995:        movl    $(IOMAP_INVALOFF << 16),CPUVAR(IOBASE)
                    996: .Liobitmap_done:
                    997:
1.56      ad        998:        /* Is this process using RAS (restartable atomic sequences)? */
                    999:        movl    L_PROC(%edi),%eax
                   1000:        cmpl    $0,P_RASLIST(%eax)
                   1001:        jne     5f
                   1002:
1.48      yamt     1003:        /*
                   1004:         * Restore cr0 (including FPU state).  Raise the IPL to IPL_IPI.
                   1005:         * FPU IPIs can alter the LWP's saved cr0.  Dropping the priority
                   1006:         * is deferred until mi_switch(), when cpu_switchto() returns.
                   1007:         */
1.62      bouyer   1008: 2:
                   1009: #ifndef XEN
                   1010:        movl    $IPL_IPI,CPUVAR(ILEVEL)
1.79      ad       1011:        movl    PCB_CR0(%ebx),%ecx              /* has CR0_TS clear */
1.48      yamt     1012:        movl    %cr0,%edx
1.1       fvdl     1013:
1.30      junyoung 1014:        /*
1.22      wiz      1015:         * If our floating point registers are on a different CPU,
1.48      yamt     1016:         * set CR0_TS so we'll trap rather than reuse bogus state.
1.1       fvdl     1017:         */
1.79      ad       1018:        cmpl    CPUVAR(FPCURLWP),%edi
1.48      yamt     1019:        je      3f
1.1       fvdl     1020:        orl     $CR0_TS,%ecx
1.48      yamt     1021:
                   1022:        /* Reloading CR0 is very expensive - avoid if possible. */
                   1023: 3:     cmpl    %edx,%ecx
                   1024:        je      4f
1.1       fvdl     1025:        movl    %ecx,%cr0
1.62      bouyer   1026: #endif /* XEN */
1.1       fvdl     1027:
1.48      yamt     1028:        /* Return to the new LWP, returning 'oldlwp' in %eax. */
                   1029: 4:     movl    %esi,%eax
1.1       fvdl     1030:        popl    %edi
                   1031:        popl    %esi
                   1032:        popl    %ebx
                   1033:        ret
1.20      dsl      1034:
1.48      yamt     1035:        /* Check for restartable atomic sequences (RAS). */
                   1036: 5:     movl    L_MD_REGS(%edi),%ecx
                   1037:        pushl   TF_EIP(%ecx)
1.20      dsl      1038:        pushl   %eax
                   1039:        call    _C_LABEL(ras_lookup)
                   1040:        addl    $8,%esp
                   1041:        cmpl    $-1,%eax
1.48      yamt     1042:        je      2b
1.49      ad       1043:        movl    L_MD_REGS(%edi),%ecx
                   1044:        movl    %eax,TF_EIP(%ecx)
1.48      yamt     1045:        jmp     2b
1.1       fvdl     1046:
1.60      yamt     1047: .Lcopy_iobitmap:
                   1048:        /* Copy I/O bitmap. */
                   1049:        movl    $(IOMAPSIZE/4),%ecx
                   1050:        pushl   %esi
                   1051:        pushl   %edi
                   1052:        movl    %eax,%esi               /* pcb_iomap */
                   1053:        movl    CPUVAR(SELF),%edi
                   1054:        leal    CPU_INFO_IOMAP(%edi),%edi
                   1055:        rep
                   1056:        movsl
                   1057:        popl    %edi
                   1058:        popl    %esi
                   1059:        movl    $((CPU_INFO_IOMAP - CPU_INFO_TSS) << 16),CPUVAR(IOBASE)
                   1060:        jmp     .Liobitmap_done
1.72      yamt     1061: END(cpu_switchto)
1.60      yamt     1062:
1.1       fvdl     1063: /*
                   1064:  * void savectx(struct pcb *pcb);
1.48      yamt     1065:  *
1.1       fvdl     1066:  * Update pcb, saving current processor state.
                   1067:  */
                   1068: ENTRY(savectx)
1.47      skrll    1069:        movl    4(%esp),%edx            # edx = pcb
1.1       fvdl     1070:        movl    %esp,PCB_ESP(%edx)
                   1071:        movl    %ebp,PCB_EBP(%edx)
                   1072:        ret
1.72      yamt     1073: END(savectx)
1.1       fvdl     1074:
                   1075: /*
1.48      yamt     1076:  * osyscall()
                   1077:  *
1.1       fvdl     1078:  * Old call gate entry for syscall
                   1079:  */
                   1080: IDTVEC(osyscall)
1.48      yamt     1081:        pushfl                  # set eflags in trap frame
1.1       fvdl     1082:        popl    8(%esp)
                   1083:        pushl   $7              # size of instruction for restart
                   1084:        jmp     syscall1
1.72      yamt     1085: IDTVEC_END(osyscall)
1.1       fvdl     1086:
                   1087: /*
1.48      yamt     1088:  * syscall()
                   1089:  *
1.1       fvdl     1090:  * Trap gate entry for syscall
                   1091:  */
                   1092: IDTVEC(syscall)
                   1093:        pushl   $2              # size of instruction for restart
                   1094: syscall1:
                   1095:        pushl   $T_ASTFLT       # trap # for doing ASTs
                   1096:        INTRENTRY
                   1097: #ifdef DIAGNOSTIC
                   1098:        movl    CPUVAR(ILEVEL),%ebx
                   1099:        testl   %ebx,%ebx
                   1100:        jz      1f
                   1101:        pushl   $5f
                   1102:        call    _C_LABEL(printf)
                   1103:        addl    $4,%esp
                   1104: #ifdef DDB
                   1105:        int     $3
                   1106: #endif
1.30      junyoung 1107: 1:
1.1       fvdl     1108: #endif /* DIAGNOSTIC */
1.67      ad       1109:        incl    CPUVAR(NSYSCALL)        # count it atomically
1.68      ad       1110:        movl    CPUVAR(CURLWP),%edi
                   1111:        movl    L_PROC(%edi),%edx
                   1112:        movl    %esp,L_MD_REGS(%edi)    # save pointer to frame
1.15      fvdl     1113:        pushl   %esp
1.1       fvdl     1114:        call    *P_MD_SYSCALL(%edx)     # get pointer to syscall() function
1.15      fvdl     1115:        addl    $4,%esp
1.27      yamt     1116: .Lsyscall_checkast:
1.24      yamt     1117:        /* Check for ASTs on exit to user mode. */
1.62      bouyer   1118:        CLI(%eax)
1.68      ad       1119:        movl    L_MD_ASTPENDING(%edi), %eax
                   1120:        orl     CPUVAR(WANT_PMAPLOAD), %eax
1.24      yamt     1121:        jnz     9f
1.62      bouyer   1122: #ifdef XEN
                   1123:        STIC(%eax)
                   1124:        jz      14f
                   1125:        call    _C_LABEL(stipending)
                   1126:        testl   %eax,%eax
                   1127:        jz      14f
                   1128:        /* process pending interrupts */
                   1129:        CLI(%eax)
                   1130:        movl    CPUVAR(ILEVEL), %ebx
                   1131:        movl    $.Lsyscall_resume, %esi # address to resume loop at
                   1132: .Lsyscall_resume:
                   1133:        movl    %ebx,%eax       # get cpl
                   1134:        movl    CPUVAR(IUNMASK)(,%eax,4),%eax
                   1135:        andl    CPUVAR(IPENDING),%eax   # any non-masked bits left?
                   1136:        jz      17f
                   1137:        bsrl    %eax,%eax
                   1138:        btrl    %eax,CPUVAR(IPENDING)
                   1139:        movl    CPUVAR(ISOURCES)(,%eax,4),%eax
                   1140:        jmp     *IS_RESUME(%eax)
                   1141: 17:    movl    %ebx, CPUVAR(ILEVEL)    #restore cpl
                   1142:        jmp     .Lsyscall_checkast
                   1143: 14:
                   1144: #endif /* XEN */
1.1       fvdl     1145: #ifndef DIAGNOSTIC
1.24      yamt     1146:        INTRFASTEXIT
1.1       fvdl     1147: #else /* DIAGNOSTIC */
1.24      yamt     1148:        cmpl    $IPL_NONE,CPUVAR(ILEVEL)
1.1       fvdl     1149:        jne     3f
                   1150:        INTRFASTEXIT
1.62      bouyer   1151: 3:     STI(%eax)
1.1       fvdl     1152:        pushl   $4f
                   1153:        call    _C_LABEL(printf)
                   1154:        addl    $4,%esp
1.58      ad       1155:        pushl   $IPL_NONE
                   1156:        call    _C_LABEL(spllower)
                   1157:        addl    $4,%esp
1.53      yamt     1158:        jmp     .Lsyscall_checkast
1.1       fvdl     1159: 4:     .asciz  "WARNING: SPL NOT LOWERED ON SYSCALL EXIT\n"
1.30      junyoung 1160: 5:     .asciz  "WARNING: SPL NOT ZERO ON SYSCALL ENTRY\n"
1.1       fvdl     1161: #endif /* DIAGNOSTIC */
1.68      ad       1162: 9:
                   1163:        cmpl    $0, CPUVAR(WANT_PMAPLOAD)
                   1164:        jz      10f
                   1165:        STI(%eax)
1.24      yamt     1166:        call    _C_LABEL(pmap_load)
1.27      yamt     1167:        jmp     .Lsyscall_checkast      /* re-check ASTs */
1.68      ad       1168: 10:
                   1169:        /* Always returning to user mode here. */
                   1170:        movl    $0, L_MD_ASTPENDING(%edi)
                   1171:        STI(%eax)
                   1172:        /* Pushed T_ASTFLT into tf_trapno on entry. */
                   1173:        pushl   %esp
                   1174:        call    _C_LABEL(trap)
                   1175:        addl    $4,%esp
                   1176:        jmp     .Lsyscall_checkast      /* re-check ASTs */
1.72      yamt     1177: IDTVEC_END(syscall)
1.1       fvdl     1178:
1.81    ! ad       1179: IDTVEC(svr4_fasttrap)
        !          1180:        pushl   $2              # size of instruction for restart
        !          1181:        pushl   $T_ASTFLT       # trap # for doing ASTs
        !          1182:        INTRENTRY
        !          1183:        pushl   $RW_READER
        !          1184:        pushl   $_C_LABEL(svr4_fasttrap_lock)
        !          1185:        call    _C_LABEL(rw_enter)
        !          1186:        addl    $8,%esp
        !          1187:        call    *_C_LABEL(svr4_fasttrap_vec)
        !          1188:        pushl   $_C_LABEL(svr4_fasttrap_lock)
        !          1189:        call    _C_LABEL(rw_exit)
        !          1190:        addl    $4,%esp
        !          1191: 2:     /* Check for ASTs on exit to user mode. */
        !          1192:        cli
        !          1193:        CHECK_ASTPENDING(%eax)
        !          1194:        je      1f
        !          1195:        /* Always returning to user mode here. */
        !          1196:        CLEAR_ASTPENDING(%eax)
        !          1197:        sti
        !          1198:        /* Pushed T_ASTFLT into tf_trapno on entry. */
        !          1199:        pushl   %esp
        !          1200:        call    _C_LABEL(trap)
        !          1201:        addl    $4,%esp
        !          1202:        jmp     2b
        !          1203: 1:     CHECK_DEFERRED_SWITCH
        !          1204:        jnz     9f
        !          1205:        INTRFASTEXIT
        !          1206: 9:     sti
        !          1207:        call    _C_LABEL(pmap_load)
        !          1208:        cli
        !          1209:        jmp     2b
        !          1210:
1.1       fvdl     1211: #if NNPX > 0
                   1212: /*
                   1213:  * Special interrupt handlers.  Someday intr0-intr15 will be used to count
                   1214:  * interrupts.  We'll still need a special exception 16 handler.  The busy
                   1215:  * latch stuff in probintr() can be moved to npxprobe().
                   1216:  */
                   1217:
1.48      yamt     1218: /*
                   1219:  * void probeintr(void)
                   1220:  */
1.1       fvdl     1221: NENTRY(probeintr)
                   1222:        ss
                   1223:        incl    _C_LABEL(npx_intrs_while_probing)
                   1224:        pushl   %eax
                   1225:        movb    $0x20,%al       # EOI (asm in strings loses cpp features)
                   1226:        outb    %al,$0xa0       # IO_ICU2
                   1227:        outb    %al,$0x20       # IO_ICU1
                   1228:        movb    $0,%al
                   1229:        outb    %al,$0xf0       # clear BUSY# latch
                   1230:        popl    %eax
                   1231:        iret
1.72      yamt     1232: END(probeintr)
1.1       fvdl     1233:
1.48      yamt     1234: /*
                   1235:  * void probetrap(void)
                   1236:  */
1.1       fvdl     1237: NENTRY(probetrap)
                   1238:        ss
                   1239:        incl    _C_LABEL(npx_traps_while_probing)
                   1240:        fnclex
                   1241:        iret
1.72      yamt     1242: END(probetrap)
1.1       fvdl     1243:
1.48      yamt     1244: /*
                   1245:  * int npx586bug1(int a, int b)
                   1246:  */
1.1       fvdl     1247: NENTRY(npx586bug1)
                   1248:        fildl   4(%esp)         # x
                   1249:        fildl   8(%esp)         # y
                   1250:        fld     %st(1)
                   1251:        fdiv    %st(1),%st      # x/y
                   1252:        fmulp   %st,%st(1)      # (x/y)*y
                   1253:        fsubrp  %st,%st(1)      # x-(x/y)*y
                   1254:        pushl   $0
                   1255:        fistpl  (%esp)
                   1256:        popl    %eax
                   1257:        ret
1.72      yamt     1258: END(npx586bug1)
1.1       fvdl     1259: #endif /* NNPX > 0 */
1.50      ad       1260:
                   1261: /*
1.76      ad       1262:  * void sse2_idlezero_page(void *pg)
1.50      ad       1263:  *
1.76      ad       1264:  * Zero a page without polluting the cache.  Preemption must be
                   1265:  * disabled by the caller. Abort if a preemption is pending.
1.50      ad       1266:  */
1.76      ad       1267: ENTRY(sse2_idlezero_page)
1.50      ad       1268:        pushl   %ebp
                   1269:        movl    %esp,%ebp
                   1270:        movl    8(%esp), %edx
1.76      ad       1271:        movl    $(PAGE_SIZE/32), %ecx
1.50      ad       1272:        xorl    %eax, %eax
                   1273:        .align  16
                   1274: 1:
1.76      ad       1275:        cmpl    $0, CPUVAR(RESCHED)
                   1276:        jnz     2f
1.50      ad       1277:        movnti  %eax, 0(%edx)
                   1278:        movnti  %eax, 4(%edx)
                   1279:        movnti  %eax, 8(%edx)
                   1280:        movnti  %eax, 12(%edx)
                   1281:        movnti  %eax, 16(%edx)
                   1282:        movnti  %eax, 20(%edx)
                   1283:        movnti  %eax, 24(%edx)
                   1284:        movnti  %eax, 28(%edx)
1.76      ad       1285:        addl    $32, %edx
1.75      ad       1286:        decl    %ecx
1.50      ad       1287:        jnz     1b
                   1288:        sfence
1.76      ad       1289:        incl    %eax
1.50      ad       1290:        pop     %ebp
                   1291:        ret
1.76      ad       1292: 2:
1.50      ad       1293:        sfence
                   1294:        popl    %ebp
                   1295:        ret
1.76      ad       1296: END(sse2_idlezero_page)

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