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Annotation of src/sys/arch/i386/i386/locore.S, Revision 1.56

1.56    ! ad          1: /*     $NetBSD: locore.S,v 1.55 2007/11/10 23:04:29 ad Exp $   */
1.53      yamt        2:
                      3: /*
                      4:  * Copyright-o-rama!
                      5:  */
                      6:
                      7: /*
                      8:  * Copyright (c) 2001 Wasabi Systems, Inc.
                      9:  * All rights reserved.
                     10:  *
                     11:  * Written by Frank van der Linden for Wasabi Systems, Inc.
                     12:  *
                     13:  * Redistribution and use in source and binary forms, with or without
                     14:  * modification, are permitted provided that the following conditions
                     15:  * are met:
                     16:  * 1. Redistributions of source code must retain the above copyright
                     17:  *    notice, this list of conditions and the following disclaimer.
                     18:  * 2. Redistributions in binary form must reproduce the above copyright
                     19:  *    notice, this list of conditions and the following disclaimer in the
                     20:  *    documentation and/or other materials provided with the distribution.
                     21:  * 3. All advertising materials mentioning features or use of this software
                     22:  *    must display the following acknowledgement:
                     23:  *      This product includes software developed for the NetBSD Project by
                     24:  *      Wasabi Systems, Inc.
                     25:  * 4. The name of Wasabi Systems, Inc. may not be used to endorse
                     26:  *    or promote products derived from this software without specific prior
                     27:  *    written permission.
                     28:  *
                     29:  * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND
                     30:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
                     31:  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
                     32:  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL WASABI SYSTEMS, INC
                     33:  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
                     34:  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
                     35:  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
                     36:  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
                     37:  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
                     38:  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
                     39:  * POSSIBILITY OF SUCH DAMAGE.
                     40:  */
                     41:
1.1       fvdl       42:
                     43: /*-
1.48      yamt       44:  * Copyright (c) 1998, 2000, 2004, 2006, 2007 The NetBSD Foundation, Inc.
1.1       fvdl       45:  * All rights reserved.
                     46:  *
                     47:  * This code is derived from software contributed to The NetBSD Foundation
                     48:  * by Charles M. Hannum.
                     49:  *
                     50:  * Redistribution and use in source and binary forms, with or without
                     51:  * modification, are permitted provided that the following conditions
                     52:  * are met:
                     53:  * 1. Redistributions of source code must retain the above copyright
                     54:  *    notice, this list of conditions and the following disclaimer.
                     55:  * 2. Redistributions in binary form must reproduce the above copyright
                     56:  *    notice, this list of conditions and the following disclaimer in the
                     57:  *    documentation and/or other materials provided with the distribution.
                     58:  * 3. All advertising materials mentioning features or use of this software
                     59:  *    must display the following acknowledgement:
                     60:  *        This product includes software developed by the NetBSD
                     61:  *        Foundation, Inc. and its contributors.
                     62:  * 4. Neither the name of The NetBSD Foundation nor the names of its
                     63:  *    contributors may be used to endorse or promote products derived
                     64:  *    from this software without specific prior written permission.
                     65:  *
                     66:  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
                     67:  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
                     68:  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
                     69:  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
                     70:  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
                     71:  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
                     72:  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
                     73:  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
                     74:  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
                     75:  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
                     76:  * POSSIBILITY OF SUCH DAMAGE.
                     77:  */
                     78:
                     79: /*-
                     80:  * Copyright (c) 1990 The Regents of the University of California.
                     81:  * All rights reserved.
                     82:  *
                     83:  * This code is derived from software contributed to Berkeley by
                     84:  * William Jolitz.
                     85:  *
                     86:  * Redistribution and use in source and binary forms, with or without
                     87:  * modification, are permitted provided that the following conditions
                     88:  * are met:
                     89:  * 1. Redistributions of source code must retain the above copyright
                     90:  *    notice, this list of conditions and the following disclaimer.
                     91:  * 2. Redistributions in binary form must reproduce the above copyright
                     92:  *    notice, this list of conditions and the following disclaimer in the
                     93:  *    documentation and/or other materials provided with the distribution.
1.12      agc        94:  * 3. Neither the name of the University nor the names of its contributors
1.1       fvdl       95:  *    may be used to endorse or promote products derived from this software
                     96:  *    without specific prior written permission.
                     97:  *
                     98:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
                     99:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                    100:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                    101:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
                    102:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                    103:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                    104:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                    105:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                    106:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                    107:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                    108:  * SUCH DAMAGE.
                    109:  *
                    110:  *     @(#)locore.s    7.3 (Berkeley) 5/13/91
                    111:  */
                    112:
1.18      christos  113: #include "opt_compat_oldboot.h"
1.1       fvdl      114: #include "opt_cputype.h"
                    115: #include "opt_ddb.h"
                    116: #include "opt_realmem.h"
1.18      christos  117: #include "opt_vm86.h"
1.1       fvdl      118:
                    119: #include "npx.h"
                    120: #include "assym.h"
                    121: #include "lapic.h"
                    122: #include "ioapic.h"
1.8       fvdl      123: #include "ksyms.h"
1.1       fvdl      124:
                    125: #include <sys/errno.h>
                    126: #include <sys/syscall.h>
                    127:
                    128: #include <machine/cputypes.h>
                    129: #include <machine/segments.h>
                    130: #include <machine/specialreg.h>
                    131: #include <machine/trap.h>
                    132: #include <machine/i82489reg.h>
1.37      jmmv      133: #include <machine/multiboot.h>
1.1       fvdl      134: #include <machine/asm.h>
1.48      yamt      135: #include <machine/frameasm.h>
                    136: #include <machine/i82489reg.h>
1.1       fvdl      137:
                    138: /* XXX temporary kluge; these should not be here */
                    139: /* Get definitions for IOM_BEGIN, IOM_END, and IOM_SIZE */
                    140: #include <dev/isa/isareg.h>
                    141:
                    142: /*
                    143:  * Initialization
                    144:  */
                    145:        .data
                    146:
                    147:        .globl  _C_LABEL(cpu)
1.38      jmmv      148:        .globl  _C_LABEL(esym)
                    149:        .globl  _C_LABEL(atdevbase)
1.40      yamt      150:        .globl  _C_LABEL(proc0uarea),_C_LABEL(PDPpaddr)
1.1       fvdl      151:        .globl  _C_LABEL(gdt)
                    152:        .globl  _C_LABEL(idt)
1.30      junyoung  153:        .globl  _C_LABEL(lapic_tpr)
                    154:
1.1       fvdl      155: #if NLAPIC > 0
                    156: #ifdef __ELF__
1.7       thorpej   157:        .align  PAGE_SIZE
1.1       fvdl      158: #else
                    159:        .align  12
                    160: #endif
                    161:        .globl _C_LABEL(local_apic), _C_LABEL(lapic_id)
                    162: _C_LABEL(local_apic):
                    163:        .space  LAPIC_ID
1.30      junyoung  164: _C_LABEL(lapic_id):
1.1       fvdl      165:        .long   0x00000000
                    166:        .space  LAPIC_TPRI-(LAPIC_ID+4)
1.30      junyoung  167: _C_LABEL(lapic_tpr):
1.1       fvdl      168:        .space  LAPIC_PPRI-LAPIC_TPRI
1.30      junyoung  169: _C_LABEL(lapic_ppr):
1.1       fvdl      170:        .space  LAPIC_ISR-LAPIC_PPRI
                    171: _C_LABEL(lapic_isr):
1.7       thorpej   172:        .space  PAGE_SIZE-LAPIC_ISR
1.1       fvdl      173: #else
1.30      junyoung  174: _C_LABEL(lapic_tpr):
1.1       fvdl      175:        .long 0
                    176: #endif
1.30      junyoung  177:
1.48      yamt      178: _C_LABEL(cpu):         .long   0       # are we 80486, Pentium, or..
1.1       fvdl      179: _C_LABEL(atdevbase):   .long   0       # location of start of iomem in virtual
1.40      yamt      180: _C_LABEL(proc0uarea):  .long   0
1.31      junyoung  181: _C_LABEL(PDPpaddr):    .long   0       # paddr of PDP, for libkvm
1.53      yamt      182: _C_LABEL(tablesize):   .long   0
1.30      junyoung  183:
1.1       fvdl      184:        .space 512
                    185: tmpstk:
                    186:
                    187:
1.35      yamt      188: #define        _RELOC(x)       ((x) - KERNBASE)
1.1       fvdl      189: #define        RELOC(x)        _RELOC(_C_LABEL(x))
                    190:
                    191:        .text
                    192:        .globl  _C_LABEL(kernel_text)
                    193:        .set    _C_LABEL(kernel_text),KERNTEXTOFF
                    194:
                    195:        .globl  start
                    196: start: movw    $0x1234,0x472                   # warm boot
                    197:
1.37      jmmv      198: #if defined(MULTIBOOT)
                    199:        jmp     1f
                    200:
                    201:        .align  4
                    202:        .globl  Multiboot_Header
                    203: _C_LABEL(Multiboot_Header):
1.44      jmmv      204: #define MULTIBOOT_HEADER_FLAGS (MULTIBOOT_HEADER_WANT_MEMORY)
1.37      jmmv      205:        .long   MULTIBOOT_HEADER_MAGIC
                    206:        .long   MULTIBOOT_HEADER_FLAGS
                    207:        .long   -(MULTIBOOT_HEADER_MAGIC + MULTIBOOT_HEADER_FLAGS)
                    208:
                    209: 1:
                    210:        /* Check if we are being executed by a Multiboot-compliant boot
                    211:         * loader. */
                    212:        cmpl    $MULTIBOOT_INFO_MAGIC,%eax
                    213:        jne     1f
                    214:
1.43      mrg       215:        /*
                    216:         * Indeed, a multiboot-compliant boot loader executed us.  We copy
1.37      jmmv      217:         * the received Multiboot information structure into kernel's data
                    218:         * space to process it later -- after we are relocated.  It will
1.43      mrg       219:         * be safer to run complex C code than doing it at this point.
                    220:         */
1.37      jmmv      221:        pushl   %ebx            # Address of Multiboot information
                    222:        call    _C_LABEL(multiboot_pre_reloc)
                    223:        addl    $4,%esp
1.38      jmmv      224:        jmp     2f
1.37      jmmv      225: #endif
                    226:
                    227: 1:
1.1       fvdl      228:        /*
1.38      jmmv      229:         * At this point, we know that a NetBSD-specific boot loader
                    230:         * booted this kernel.  The stack carries the following parameters:
1.41      jmmv      231:         * (boothowto, [bootdev], bootinfo, esym, biosextmem, biosbasemem),
1.38      jmmv      232:         * 4 bytes each.
1.1       fvdl      233:         */
1.38      jmmv      234:        addl    $4,%esp         # Discard return address to boot loader
                    235:        call    _C_LABEL(native_loader)
                    236:        addl    $24,%esp
1.1       fvdl      237:
                    238: 2:
                    239:        /* First, reset the PSL. */
                    240:        pushl   $PSL_MBO
                    241:        popfl
                    242:
                    243:        /* Clear segment registers; always null in proc0. */
                    244:        xorl    %eax,%eax
                    245:        movw    %ax,%fs
                    246:        movw    %ax,%gs
                    247:        decl    %eax
                    248:        movl    %eax,RELOC(cpu_info_primary)+CPU_INFO_LEVEL
                    249:
                    250:        /* Find out our CPU type. */
                    251:
                    252: try386:        /* Try to toggle alignment check flag; does not exist on 386. */
                    253:        pushfl
                    254:        popl    %eax
                    255:        movl    %eax,%ecx
                    256:        orl     $PSL_AC,%eax
                    257:        pushl   %eax
                    258:        popfl
                    259:        pushfl
                    260:        popl    %eax
                    261:        xorl    %ecx,%eax
                    262:        andl    $PSL_AC,%eax
                    263:        pushl   %ecx
                    264:        popfl
                    265:
                    266:        testl   %eax,%eax
                    267:        jnz     try486
                    268:
                    269:        /*
                    270:         * Try the test of a NexGen CPU -- ZF will not change on a DIV
                    271:         * instruction on a NexGen, it will on an i386.  Documented in
                    272:         * Nx586 Processor Recognition Application Note, NexGen, Inc.
                    273:         */
                    274:        movl    $0x5555,%eax
                    275:        xorl    %edx,%edx
                    276:        movl    $2,%ecx
                    277:        divl    %ecx
                    278:        jnz     is386
                    279:
                    280: isnx586:
                    281:        /*
                    282:         * Don't try cpuid, as Nx586s reportedly don't support the
                    283:         * PSL_ID bit.
                    284:         */
                    285:        movl    $CPU_NX586,RELOC(cpu)
                    286:        jmp     2f
                    287:
                    288: is386:
                    289:        movl    $CPU_386,RELOC(cpu)
                    290:        jmp     2f
                    291:
                    292: try486:        /* Try to toggle identification flag; does not exist on early 486s. */
                    293:        pushfl
                    294:        popl    %eax
                    295:        movl    %eax,%ecx
                    296:        xorl    $PSL_ID,%eax
                    297:        pushl   %eax
                    298:        popfl
                    299:        pushfl
                    300:        popl    %eax
                    301:        xorl    %ecx,%eax
                    302:        andl    $PSL_ID,%eax
                    303:        pushl   %ecx
                    304:        popfl
                    305:
                    306:        testl   %eax,%eax
                    307:        jnz     try586
                    308: is486: movl    $CPU_486,RELOC(cpu)
                    309:        /*
                    310:         * Check Cyrix CPU
                    311:         * Cyrix CPUs do not change the undefined flags following
                    312:         * execution of the divide instruction which divides 5 by 2.
                    313:         *
                    314:         * Note: CPUID is enabled on M2, so it passes another way.
                    315:         */
                    316:        pushfl
                    317:        movl    $0x5555, %eax
                    318:        xorl    %edx, %edx
                    319:        movl    $2, %ecx
                    320:        clc
                    321:        divl    %ecx
                    322:        jnc     trycyrix486
                    323:        popfl
                    324:        jmp 2f
                    325: trycyrix486:
                    326:        movl    $CPU_6x86,RELOC(cpu)    # set CPU type
                    327:        /*
                    328:         * Check for Cyrix 486 CPU by seeing if the flags change during a
                    329:         * divide. This is documented in the Cx486SLC/e SMM Programmer's
                    330:         * Guide.
                    331:         */
                    332:        xorl    %edx,%edx
                    333:        cmpl    %edx,%edx               # set flags to known state
                    334:        pushfl
                    335:        popl    %ecx                    # store flags in ecx
                    336:        movl    $-1,%eax
                    337:        movl    $4,%ebx
                    338:        divl    %ebx                    # do a long division
                    339:        pushfl
                    340:        popl    %eax
                    341:        xorl    %ecx,%eax               # are the flags different?
                    342:        testl   $0x8d5,%eax             # only check C|PF|AF|Z|N|V
                    343:        jne     2f                      # yes; must be Cyrix 6x86 CPU
                    344:        movl    $CPU_486DLC,RELOC(cpu)  # set CPU type
                    345:
                    346: #ifndef CYRIX_CACHE_WORKS
                    347:        /* Disable caching of the ISA hole only. */
                    348:        invd
                    349:        movb    $CCR0,%al               # Configuration Register index (CCR0)
                    350:        outb    %al,$0x22
                    351:        inb     $0x23,%al
                    352:        orb     $(CCR0_NC1|CCR0_BARB),%al
                    353:        movb    %al,%ah
                    354:        movb    $CCR0,%al
                    355:        outb    %al,$0x22
                    356:        movb    %ah,%al
                    357:        outb    %al,$0x23
                    358:        invd
                    359: #else /* CYRIX_CACHE_WORKS */
                    360:        /* Set cache parameters */
                    361:        invd                            # Start with guaranteed clean cache
                    362:        movb    $CCR0,%al               # Configuration Register index (CCR0)
                    363:        outb    %al,$0x22
                    364:        inb     $0x23,%al
                    365:        andb    $~CCR0_NC0,%al
                    366: #ifndef CYRIX_CACHE_REALLY_WORKS
                    367:        orb     $(CCR0_NC1|CCR0_BARB),%al
                    368: #else
                    369:        orb     $CCR0_NC1,%al
                    370: #endif
                    371:        movb    %al,%ah
                    372:        movb    $CCR0,%al
                    373:        outb    %al,$0x22
                    374:        movb    %ah,%al
                    375:        outb    %al,$0x23
                    376:        /* clear non-cacheable region 1 */
                    377:        movb    $(NCR1+2),%al
                    378:        outb    %al,$0x22
                    379:        movb    $NCR_SIZE_0K,%al
                    380:        outb    %al,$0x23
                    381:        /* clear non-cacheable region 2 */
                    382:        movb    $(NCR2+2),%al
                    383:        outb    %al,$0x22
                    384:        movb    $NCR_SIZE_0K,%al
                    385:        outb    %al,$0x23
                    386:        /* clear non-cacheable region 3 */
                    387:        movb    $(NCR3+2),%al
                    388:        outb    %al,$0x22
                    389:        movb    $NCR_SIZE_0K,%al
                    390:        outb    %al,$0x23
                    391:        /* clear non-cacheable region 4 */
                    392:        movb    $(NCR4+2),%al
                    393:        outb    %al,$0x22
                    394:        movb    $NCR_SIZE_0K,%al
                    395:        outb    %al,$0x23
                    396:        /* enable caching in CR0 */
                    397:        movl    %cr0,%eax
                    398:        andl    $~(CR0_CD|CR0_NW),%eax
                    399:        movl    %eax,%cr0
                    400:        invd
                    401: #endif /* CYRIX_CACHE_WORKS */
                    402:
                    403:        jmp     2f
                    404:
                    405: try586:        /* Use the `cpuid' instruction. */
                    406:        xorl    %eax,%eax
                    407:        cpuid
                    408:        movl    %eax,RELOC(cpu_info_primary)+CPU_INFO_LEVEL
                    409:
                    410: 2:
                    411:        /*
                    412:         * Finished with old stack; load new %esp now instead of later so we
                    413:         * can trace this code without having to worry about the trace trap
                    414:         * clobbering the memory test or the zeroing of the bss+bootstrap page
                    415:         * tables.
                    416:         *
                    417:         * The boot program should check:
                    418:         *      text+data <= &stack_variable - more_space_for_stack
                    419:         *      text+data+bss+pad+space_for_page_tables <= end_of_memory
                    420:         * Oops, the gdt is in the carcass of the boot program so clearing
                    421:         * the rest of memory is still not possible.
                    422:         */
                    423:        movl    $_RELOC(tmpstk),%esp    # bootstrap stack end location
                    424:
                    425: /*
                    426:  * Virtual address space of kernel:
                    427:  *
1.53      yamt      428:  * text | data | bss | [syms] | page dir | proc0 kstack | L1 ptp
1.1       fvdl      429:  *                           0          1       2      3
                    430:  */
1.53      yamt      431:
                    432: #define        PROC0_PDIR_OFF  0
                    433: #define        PROC0_STK_OFF   (PROC0_PDIR_OFF + PAGE_SIZE)
                    434: #define        PROC0_PTP1_OFF  (PROC0_STK_OFF + UPAGES * PAGE_SIZE)
                    435:
                    436: /*
                    437:  * fillkpt
                    438:  *     eax = pte (page frame | control | status)
                    439:  *     ebx = page table address
                    440:  *     ecx = number of pages to map
                    441:  */
                    442:
                    443: #define fillkpt        \
                    444: 1:     movl    %eax,(%ebx)     ;       /* store phys addr */ \
                    445:        addl    $4,%ebx         ;       /* next pte/pde */ \
                    446:        addl    $PAGE_SIZE,%eax ;       /* next phys page */ \
                    447:        loop    1b              ;  \
                    448:
1.1       fvdl      449:
                    450:        /* Find end of kernel image. */
                    451:        movl    $RELOC(end),%edi
1.8       fvdl      452: #if (NKSYMS || defined(DDB) || defined(LKM)) && !defined(SYMTAB_SPACE)
1.1       fvdl      453:        /* Save the symbols (if loaded). */
                    454:        movl    RELOC(esym),%eax
                    455:        testl   %eax,%eax
                    456:        jz      1f
1.35      yamt      457:        subl    $KERNBASE,%eax
1.1       fvdl      458:        movl    %eax,%edi
                    459: 1:
                    460: #endif
                    461:
1.53      yamt      462:        /* Compute sizes */
1.1       fvdl      463:        movl    %edi,%esi                       # edi = esym ? esym : end
                    464:        addl    $PGOFSET,%esi                   # page align up
                    465:        andl    $~PGOFSET,%esi
                    466:
1.53      yamt      467:        /* nkptp[1] = (esi + ~L2_FRAME) >> L2_SHIFT + 1; */
                    468:        movl    %esi,%eax
                    469:        addl    $~L2_FRAME,%eax
                    470:        shrl    $L2_SHIFT,%eax
                    471:        incl    %eax            /* one more ptp for VAs stolen by bootstrap */
                    472: 1:     movl    %eax,RELOC(nkptp)+1*4
                    473:
                    474:        /* tablesize = (1 + UPAGES + nkptp) << PGSHIFT; */
                    475:        addl    $(1+UPAGES),%eax
                    476:        shll    $PGSHIFT,%eax
                    477:        movl    %eax,RELOC(tablesize)
                    478:
                    479:        /* ensure that nkptp covers bootstrap tables */
                    480:        addl    %esi,%eax
                    481:        addl    $~L2_FRAME,%eax
                    482:        shrl    $L2_SHIFT,%eax
                    483:        incl    %eax
                    484:        cmpl    %eax,RELOC(nkptp)+1*4
                    485:        jnz     1b
                    486:
                    487:        /* Clear tables */
                    488:        movl    %esi,%edi
1.1       fvdl      489:        xorl    %eax,%eax
                    490:        cld
1.53      yamt      491:        movl    RELOC(tablesize),%ecx
                    492:        shrl    $2,%ecx
1.1       fvdl      493:        rep
                    494:        stosl
                    495:
1.53      yamt      496:        leal    (PROC0_PTP1_OFF)(%esi), %ebx
1.1       fvdl      497:
                    498: /*
                    499:  * Build initial page tables.
                    500:  */
1.53      yamt      501:        /*
                    502:         * Compute &__data_start - KERNBASE. This can't be > 4G,
                    503:         * or we can't deal with it anyway, since we can't load it in
                    504:         * 32 bit mode. So use the bottom 32 bits.
                    505:         */
                    506:        movl    $RELOC(__data_start),%edx
1.1       fvdl      507:        andl    $~PGOFSET,%edx
1.30      junyoung  508:
1.53      yamt      509:        /*
                    510:         * Skip the first MB.
                    511:         */
1.1       fvdl      512:        movl    $_RELOC(KERNTEXTOFF),%eax
                    513:        movl    %eax,%ecx
1.53      yamt      514:        shrl    $(PGSHIFT-2),%ecx       /* ((n >> PGSHIFT) << 2) for # pdes */
                    515:        addl    %ecx,%ebx
1.1       fvdl      516:
                    517:        /* Map the kernel text read-only. */
                    518:        movl    %edx,%ecx
                    519:        subl    %eax,%ecx
                    520:        shrl    $PGSHIFT,%ecx
                    521:        orl     $(PG_V|PG_KR),%eax
                    522:        fillkpt
                    523:
                    524:        /* Map the data, BSS, and bootstrap tables read-write. */
                    525:        leal    (PG_V|PG_KW)(%edx),%eax
1.53      yamt      526:        movl    RELOC(tablesize),%ecx
1.1       fvdl      527:        addl    %esi,%ecx                               # end of tables
                    528:        subl    %edx,%ecx                               # subtract end of text
                    529:        shrl    $PGSHIFT,%ecx
                    530:        fillkpt
                    531:
1.53      yamt      532:        /* Map ISA I/O mem (later atdevbase) */
1.1       fvdl      533:        movl    $(IOM_BEGIN|PG_V|PG_KW/*|PG_N*/),%eax   # having these bits set
                    534:        movl    $(IOM_SIZE>>PGSHIFT),%ecx               # for this many pte s,
                    535:        fillkpt
                    536:
                    537: /*
                    538:  * Construct a page table directory.
                    539:  */
1.53      yamt      540:        /* Set up top level entries for identity mapping */
                    541:        leal    (PROC0_PDIR_OFF)(%esi),%ebx
                    542:        leal    (PROC0_PTP1_OFF)(%esi),%eax
                    543:        orl     $(PG_V|PG_KW), %eax
                    544:        movl    RELOC(nkptp)+1*4,%ecx
1.1       fvdl      545:        fillkpt
                    546:
1.53      yamt      547:        /* Set up top level entries for actual kernel mapping */
                    548:        leal    (PROC0_PDIR_OFF + L2_SLOT_KERNBASE*4)(%esi),%ebx
                    549:        leal    (PROC0_PTP1_OFF)(%esi),%eax
                    550:        orl     $(PG_V|PG_KW), %eax
                    551:        movl    RELOC(nkptp)+1*4,%ecx
1.1       fvdl      552:        fillkpt
                    553:
                    554:        /* Install a PDE recursively mapping page directory as a page table! */
1.53      yamt      555:        leal    (PROC0_PDIR_OFF + PDIR_SLOT_PTE*4)(%esi),%ebx
                    556:        leal    (PROC0_PDIR_OFF)(%esi),%eax
                    557:        orl     $(PG_V|PG_KW),%eax
                    558:        movl    %eax,(%ebx)
                    559:
1.1       fvdl      560:
1.31      junyoung  561:        /* Save phys. addr of PDP, for libkvm. */
                    562:        movl    %esi,RELOC(PDPpaddr)
1.1       fvdl      563:
1.53      yamt      564:        /*
                    565:         * Startup checklist:
                    566:         * 1. Load %cr3 with pointer to PDIR.
                    567:         */
1.1       fvdl      568:        movl    %esi,%eax               # phys address of ptd in proc 0
                    569:        movl    %eax,%cr3               # load ptd addr into mmu
1.53      yamt      570:
                    571:        /*
                    572:         * 2. Enable paging and the rest of it.
                    573:         */
1.1       fvdl      574:        movl    %cr0,%eax               # get control word
                    575:                                        # enable paging & NPX emulation
                    576:        orl     $(CR0_PE|CR0_PG|CR0_NE|CR0_TS|CR0_EM|CR0_MP),%eax
                    577:        movl    %eax,%cr0               # and let's page NOW!
                    578:
                    579:        pushl   $begin                  # jump to high mem
                    580:        ret
                    581:
                    582: begin:
1.53      yamt      583:        /*
                    584:         * We have arrived.
                    585:         * There's no need anymore for the identity mapping in low
                    586:         * memory, remove it.
                    587:         */
                    588:        movl    _C_LABEL(nkptp)+1*4,%ecx
                    589:        leal    (PROC0_PDIR_OFF)(%esi),%ebx     # old, phys  address of PDIR
                    590:        addl    $(KERNBASE), %ebx       # new, virtual address of PDIR
1.1       fvdl      591: 1:     movl    $0,(%ebx)
1.53      yamt      592:        addl    $4,%ebx
1.1       fvdl      593:        loop    1b
                    594:
                    595:        /* Relocate atdevbase. */
1.53      yamt      596:        movl    $KERNBASE,%edx
                    597:        addl    _C_LABEL(tablesize),%edx
1.1       fvdl      598:        addl    %esi,%edx
                    599:        movl    %edx,_C_LABEL(atdevbase)
                    600:
                    601:        /* Set up bootstrap stack. */
1.53      yamt      602:        leal    (PROC0_STK_OFF+KERNBASE)(%esi),%eax
1.40      yamt      603:        movl    %eax,_C_LABEL(proc0uarea)
                    604:        leal    (KSTACK_SIZE-FRAMESIZE)(%eax),%esp
                    605:        movl    %esi,(KSTACK_SIZE+PCB_CR3)(%eax)        # pcb->pcb_cr3
1.1       fvdl      606:        xorl    %ebp,%ebp               # mark end of frames
                    607:
1.37      jmmv      608: #if defined(MULTIBOOT)
                    609:        /* It is now safe to parse the Multiboot information structure
                    610:         * we saved before from C code.  Note that we cannot delay its
                    611:         * parsing any more because initgdt (called below) needs to make
                    612:         * use of this information. */
                    613:        call    _C_LABEL(multiboot_post_reloc)
                    614: #endif
                    615:
1.1       fvdl      616:        subl    $NGDT*8, %esp           # space for temporary gdt
                    617:        pushl   %esp
                    618:        call    _C_LABEL(initgdt)
                    619:        addl    $4,%esp
1.30      junyoung  620:
1.53      yamt      621:        movl    _C_LABEL(tablesize),%eax
1.1       fvdl      622:        addl    %esi,%eax               # skip past stack and page tables
                    623:
                    624:        pushl   %eax
                    625:        call    _C_LABEL(init386)       # wire 386 chip for unix operation
                    626:        addl    $4+NGDT*8,%esp          # pop temporary gdt
                    627:
                    628: #ifdef SAFARI_FIFO_HACK
                    629:        movb    $5,%al
                    630:        movw    $0x37b,%dx
                    631:        outb    %al,%dx
                    632:        movw    $0x37f,%dx
                    633:        inb     %dx,%al
                    634:        movb    %al,%cl
                    635:
                    636:        orb     $1,%cl
                    637:
                    638:        movb    $5,%al
                    639:        movw    $0x37b,%dx
                    640:        outb    %al,%dx
                    641:        movw    $0x37f,%dx
                    642:        movb    %cl,%al
                    643:        outb    %al,%dx
                    644: #endif /* SAFARI_FIFO_HACK */
                    645:
                    646:        call    _C_LABEL(main)
                    647:
                    648: /*
1.48      yamt      649:  * void lwp_trampoline(void);
                    650:  *
1.1       fvdl      651:  * This is a trampoline function pushed onto the stack of a newly created
                    652:  * process in order to do some additional setup.  The trampoline is entered by
                    653:  * cpu_switch()ing to the process, so we abuse the callee-saved registers used
                    654:  * by cpu_switch() to store the information about the stub to call.
                    655:  * NOTE: This function does not have a normal calling sequence!
                    656:  */
1.48      yamt      657: NENTRY(lwp_trampoline)
                    658:        pushl   %ebp
                    659:        xorl    %ebp,%ebp
                    660:        pushl   %eax
                    661:        call    _C_LABEL(lwp_startup)
                    662:        addl    $8,%esp
1.1       fvdl      663:        pushl   %ebx
                    664:        call    *%esi
                    665:        addl    $4,%esp
1.53      yamt      666:        DO_DEFERRED_SWITCH
1.1       fvdl      667:        INTRFASTEXIT
                    668:        /* NOTREACHED */
                    669:
                    670: /*
1.48      yamt      671:  * sigcode()
                    672:  *
                    673:  * Signal trampoline; copied to top of user stack.  Used only for
                    674:  * compatibility with old releases of NetBSD.
1.1       fvdl      675:  */
                    676: NENTRY(sigcode)
                    677:        /*
                    678:         * Handler has returned here as if we called it.  The sigcontext
                    679:         * is on the stack after the 3 args "we" pushed.
                    680:         */
                    681:        leal    12(%esp),%eax           # get pointer to sigcontext
                    682:        movl    %eax,4(%esp)            # put it in the argument slot
                    683:                                        # fake return address already there
1.17      christos  684:        movl    $SYS_compat_16___sigreturn14,%eax
1.1       fvdl      685:        int     $0x80                   # enter kernel with args on stack
                    686:        movl    $SYS_exit,%eax
                    687:        int     $0x80                   # exit if sigreturn fails
                    688:        .globl  _C_LABEL(esigcode)
                    689: _C_LABEL(esigcode):
                    690:
                    691: /*
1.48      yamt      692:  * int setjmp(label_t *)
                    693:  *
                    694:  * Used primarily by DDB.
1.1       fvdl      695:  */
                    696: ENTRY(setjmp)
                    697:        movl    4(%esp),%eax
                    698:        movl    %ebx,(%eax)             # save ebx
                    699:        movl    %esp,4(%eax)            # save esp
                    700:        movl    %ebp,8(%eax)            # save ebp
                    701:        movl    %esi,12(%eax)           # save esi
                    702:        movl    %edi,16(%eax)           # save edi
                    703:        movl    (%esp),%edx             # get rta
                    704:        movl    %edx,20(%eax)           # save eip
1.48      yamt      705:        xorl    %eax,%eax               # return 0
1.1       fvdl      706:        ret
                    707:
1.48      yamt      708: /*
                    709:  * int longjmp(label_t *)
                    710:  *
                    711:  * Used primarily by DDB.
                    712:  */
1.1       fvdl      713: ENTRY(longjmp)
                    714:        movl    4(%esp),%eax
                    715:        movl    (%eax),%ebx             # restore ebx
                    716:        movl    4(%eax),%esp            # restore esp
                    717:        movl    8(%eax),%ebp            # restore ebp
                    718:        movl    12(%eax),%esi           # restore esi
                    719:        movl    16(%eax),%edi           # restore edi
                    720:        movl    20(%eax),%edx           # get rta
                    721:        movl    %edx,(%esp)             # put in return frame
1.48      yamt      722:        movl    $1,%eax                 # return 1
1.1       fvdl      723:        ret
                    724:
                    725: /*
1.48      yamt      726:  * struct lwp *cpu_switchto(struct lwp *oldlwp, struct newlwp)
1.30      junyoung  727:  *
1.48      yamt      728:  *     1. if (oldlwp != NULL), save its context.
                    729:  *     2. then, restore context of newlwp.
                    730:  *
                    731:  * Note that the stack frame layout is known to "struct switchframe" in
                    732:  * <machine/frame.h> and to the code in cpu_lwp_fork() which initializes
1.5       thorpej   733:  * it for a new lwp.
1.1       fvdl      734:  */
1.48      yamt      735: ENTRY(cpu_switchto)
1.1       fvdl      736:        pushl   %ebx
                    737:        pushl   %esi
                    738:        pushl   %edi
                    739:
1.48      yamt      740:        movl    16(%esp),%esi           # oldlwp
                    741:        movl    20(%esp),%edi           # newlwp
                    742:        testl   %esi,%esi
                    743:        jz      1f
1.1       fvdl      744:
1.48      yamt      745:        /* Save old context. */
                    746:        movl    L_ADDR(%esi),%eax
                    747:        movl    %esp,PCB_ESP(%eax)
                    748:        movl    %ebp,PCB_EBP(%eax)
                    749:
                    750:        /* Switch to newlwp's stack. */
                    751: 1:     movl    L_ADDR(%edi),%ebx
                    752:        movl    PCB_EBP(%ebx),%ebp
                    753:        movl    PCB_ESP(%ebx),%esp
1.1       fvdl      754:
1.48      yamt      755:        /* Switch TSS.  Reset "task busy" flag before loading. */
1.26      yamt      756:        movl    %cr3,%eax
1.48      yamt      757:        movl    %eax,PCB_CR3(%ebx)      # for TSS gates
1.54      ad        758:        movl    CPUVAR(GDT),%ecx
1.48      yamt      759:        movl    L_MD_TSS_SEL(%edi),%edx
1.54      ad        760:        andl    $~0x0200,4(%ecx,%edx, 1)
1.1       fvdl      761:        ltr     %dx
                    762:
1.48      yamt      763:        /* Set curlwp. */
                    764:        movl    %edi,CPUVAR(CURLWP)
1.1       fvdl      765:
                    766:        /* Don't bother with the rest if switching to a system process. */
1.48      yamt      767:        testl   $LW_SYSTEM,L_FLAG(%edi)
                    768:        jnz     4f
1.1       fvdl      769:
1.54      ad        770:        /* Restore thread-private %fs/%gs descriptors. */
1.55      ad        771:        movl    PCB_FSD(%ebx), %eax
                    772:        movl    PCB_FSD+4(%ebx), %edx
1.54      ad        773:        movl    %eax, (GUFS_SEL*8)(%ecx)
                    774:        movl    %edx, (GUFS_SEL*8+4)(%ecx)
1.55      ad        775:        movl    PCB_GSD(%ebx), %eax
                    776:        movl    PCB_GSD+4(%ebx), %edx
1.54      ad        777:        movl    %eax, (GUGS_SEL*8)(%ecx)
                    778:        movl    %edx, (GUGS_SEL*8+4)(%ecx)
                    779:
1.56    ! ad        780:        /* Is this process using RAS (restartable atomic sequences)? */
        !           781:        movl    L_PROC(%edi),%eax
        !           782:        cmpl    $0,P_RASLIST(%eax)
        !           783:        jne     5f
        !           784:
1.48      yamt      785:        /*
                    786:         * Restore cr0 (including FPU state).  Raise the IPL to IPL_IPI.
                    787:         * FPU IPIs can alter the LWP's saved cr0.  Dropping the priority
                    788:         * is deferred until mi_switch(), when cpu_switchto() returns.
                    789:         */
                    790: 2:     movl    $IPL_IPI,CPUVAR(ILEVEL)
                    791:        movl    PCB_CR0(%ebx),%ecx
                    792:        movl    %cr0,%edx
1.1       fvdl      793:
1.30      junyoung  794:        /*
1.22      wiz       795:         * If our floating point registers are on a different CPU,
1.48      yamt      796:         * set CR0_TS so we'll trap rather than reuse bogus state.
1.1       fvdl      797:         */
1.48      yamt      798:        movl    PCB_FPCPU(%ebx),%eax
                    799:        cmpl    CPUVAR(SELF),%eax
                    800:        je      3f
1.1       fvdl      801:        orl     $CR0_TS,%ecx
1.48      yamt      802:
                    803:        /* Reloading CR0 is very expensive - avoid if possible. */
                    804: 3:     cmpl    %edx,%ecx
                    805:        je      4f
1.1       fvdl      806:        movl    %ecx,%cr0
                    807:
1.48      yamt      808:        /* Return to the new LWP, returning 'oldlwp' in %eax. */
                    809: 4:     movl    %esi,%eax
1.1       fvdl      810:        popl    %edi
                    811:        popl    %esi
                    812:        popl    %ebx
                    813:        ret
1.20      dsl       814:
1.48      yamt      815:        /* Check for restartable atomic sequences (RAS). */
                    816: 5:     movl    L_MD_REGS(%edi),%ecx
                    817:        pushl   TF_EIP(%ecx)
1.20      dsl       818:        pushl   %eax
                    819:        call    _C_LABEL(ras_lookup)
                    820:        addl    $8,%esp
                    821:        cmpl    $-1,%eax
1.48      yamt      822:        je      2b
1.49      ad        823:        movl    L_MD_REGS(%edi),%ecx
                    824:        movl    %eax,TF_EIP(%ecx)
1.48      yamt      825:        jmp     2b
1.1       fvdl      826:
                    827: /*
                    828:  * void savectx(struct pcb *pcb);
1.48      yamt      829:  *
1.1       fvdl      830:  * Update pcb, saving current processor state.
                    831:  */
                    832: ENTRY(savectx)
1.47      skrll     833:        movl    4(%esp),%edx            # edx = pcb
1.1       fvdl      834:        movl    %esp,PCB_ESP(%edx)
                    835:        movl    %ebp,PCB_EBP(%edx)
                    836:        ret
                    837:
                    838: /*
1.48      yamt      839:  * osyscall()
                    840:  *
1.1       fvdl      841:  * Old call gate entry for syscall
                    842:  */
                    843: IDTVEC(osyscall)
1.48      yamt      844:        pushfl                  # set eflags in trap frame
1.1       fvdl      845:        popl    8(%esp)
                    846:        pushl   $7              # size of instruction for restart
                    847:        jmp     syscall1
                    848:
                    849: /*
1.48      yamt      850:  * syscall()
                    851:  *
1.1       fvdl      852:  * Trap gate entry for syscall
                    853:  */
                    854: IDTVEC(syscall)
                    855:        pushl   $2              # size of instruction for restart
                    856: syscall1:
                    857:        pushl   $T_ASTFLT       # trap # for doing ASTs
                    858:        INTRENTRY
                    859:
                    860: #ifdef DIAGNOSTIC
1.24      yamt      861:        cmpl    $0, CPUVAR(WANT_PMAPLOAD)
                    862:        jz      1f
                    863:        pushl   $6f
                    864:        call    _C_LABEL(printf)
                    865:        addl    $4, %esp
                    866: 1:
1.1       fvdl      867:        movl    CPUVAR(ILEVEL),%ebx
                    868:        testl   %ebx,%ebx
                    869:        jz      1f
                    870:        pushl   $5f
                    871:        call    _C_LABEL(printf)
                    872:        addl    $4,%esp
                    873: #ifdef DDB
                    874:        int     $3
                    875: #endif
1.30      junyoung  876: 1:
1.1       fvdl      877: #endif /* DIAGNOSTIC */
1.5       thorpej   878:        movl    CPUVAR(CURLWP),%edx
                    879:        movl    %esp,L_MD_REGS(%edx)    # save pointer to frame
                    880:        movl    L_PROC(%edx),%edx
1.15      fvdl      881:        pushl   %esp
1.1       fvdl      882:        call    *P_MD_SYSCALL(%edx)     # get pointer to syscall() function
1.15      fvdl      883:        addl    $4,%esp
1.27      yamt      884: .Lsyscall_checkast:
1.24      yamt      885:        /* Check for ASTs on exit to user mode. */
1.1       fvdl      886:        cli
1.5       thorpej   887:        CHECK_ASTPENDING(%eax)
1.1       fvdl      888:        je      1f
                    889:        /* Always returning to user mode here. */
1.5       thorpej   890:        CLEAR_ASTPENDING(%eax)
1.1       fvdl      891:        sti
                    892:        /* Pushed T_ASTFLT into tf_trapno on entry. */
1.15      fvdl      893:        pushl   %esp
1.1       fvdl      894:        call    _C_LABEL(trap)
1.15      fvdl      895:        addl    $4,%esp
1.27      yamt      896:        jmp     .Lsyscall_checkast      /* re-check ASTs */
1.53      yamt      897: 1:     CHECK_DEFERRED_SWITCH
1.24      yamt      898:        jnz     9f
1.1       fvdl      899: #ifndef DIAGNOSTIC
1.24      yamt      900:        INTRFASTEXIT
1.1       fvdl      901: #else /* DIAGNOSTIC */
1.24      yamt      902:        cmpl    $IPL_NONE,CPUVAR(ILEVEL)
1.1       fvdl      903:        jne     3f
                    904:        INTRFASTEXIT
                    905: 3:     sti
                    906:        pushl   $4f
                    907:        call    _C_LABEL(printf)
                    908:        addl    $4,%esp
                    909: #ifdef DDB
                    910:        int     $3
                    911: #endif /* DDB */
                    912:        movl    $IPL_NONE,CPUVAR(ILEVEL)
1.53      yamt      913:        jmp     .Lsyscall_checkast
1.1       fvdl      914: 4:     .asciz  "WARNING: SPL NOT LOWERED ON SYSCALL EXIT\n"
1.30      junyoung  915: 5:     .asciz  "WARNING: SPL NOT ZERO ON SYSCALL ENTRY\n"
                    916: 6:     .asciz  "WARNING: WANT PMAPLOAD ON SYSCALL ENTRY\n"
1.1       fvdl      917: #endif /* DIAGNOSTIC */
1.24      yamt      918: 9:     sti
                    919:        call    _C_LABEL(pmap_load)
1.27      yamt      920:        jmp     .Lsyscall_checkast      /* re-check ASTs */
1.1       fvdl      921:
                    922: #if NNPX > 0
                    923: /*
                    924:  * Special interrupt handlers.  Someday intr0-intr15 will be used to count
                    925:  * interrupts.  We'll still need a special exception 16 handler.  The busy
                    926:  * latch stuff in probintr() can be moved to npxprobe().
                    927:  */
                    928:
1.48      yamt      929: /*
                    930:  * void probeintr(void)
                    931:  */
1.1       fvdl      932: NENTRY(probeintr)
                    933:        ss
                    934:        incl    _C_LABEL(npx_intrs_while_probing)
                    935:        pushl   %eax
                    936:        movb    $0x20,%al       # EOI (asm in strings loses cpp features)
                    937:        outb    %al,$0xa0       # IO_ICU2
                    938:        outb    %al,$0x20       # IO_ICU1
                    939:        movb    $0,%al
                    940:        outb    %al,$0xf0       # clear BUSY# latch
                    941:        popl    %eax
                    942:        iret
                    943:
1.48      yamt      944: /*
                    945:  * void probetrap(void)
                    946:  */
1.1       fvdl      947: NENTRY(probetrap)
                    948:        ss
                    949:        incl    _C_LABEL(npx_traps_while_probing)
                    950:        fnclex
                    951:        iret
                    952:
1.48      yamt      953: /*
                    954:  * int npx586bug1(int a, int b)
                    955:  */
1.1       fvdl      956: NENTRY(npx586bug1)
                    957:        fildl   4(%esp)         # x
                    958:        fildl   8(%esp)         # y
                    959:        fld     %st(1)
                    960:        fdiv    %st(1),%st      # x/y
                    961:        fmulp   %st,%st(1)      # (x/y)*y
                    962:        fsubrp  %st,%st(1)      # x-(x/y)*y
                    963:        pushl   $0
                    964:        fistpl  (%esp)
                    965:        popl    %eax
                    966:        ret
                    967: #endif /* NNPX > 0 */
1.50      ad        968:
                    969: /*
                    970:  * void sse2_zero_page(void *pg)
                    971:  *
                    972:  * Zero a page without polluting the cache.
                    973:  */
                    974: ENTRY(sse2_zero_page)
                    975:        pushl   %ebp
                    976:        movl    %esp,%ebp
                    977:        movl    8(%esp), %edx
                    978:        movl    $PAGE_SIZE, %ecx
                    979:        xorl    %eax, %eax
                    980:        .align  16
                    981: 1:
                    982:        movnti  %eax, 0(%edx)
                    983:        movnti  %eax, 4(%edx)
                    984:        movnti  %eax, 8(%edx)
                    985:        movnti  %eax, 12(%edx)
                    986:        movnti  %eax, 16(%edx)
                    987:        movnti  %eax, 20(%edx)
                    988:        movnti  %eax, 24(%edx)
                    989:        movnti  %eax, 28(%edx)
                    990:        subl    $32, %ecx
                    991:        leal    32(%edx), %edx
                    992:        jnz     1b
                    993:        sfence
                    994:        pop     %ebp
                    995:        ret
                    996:
                    997: /*
                    998:  * void sse2_copy_page(void *src, void *dst)
                    999:  *
                   1000:  * Copy a page without polluting the cache.
                   1001:  */
                   1002: ENTRY(sse2_copy_page)
                   1003:        pushl   %ebp
                   1004:        pushl   %ebx
                   1005:        pushl   %esi
                   1006:        pushl   %edi
                   1007:        movl    20(%esp), %esi
                   1008:        movl    24(%esp), %edi
                   1009:        movl    $PAGE_SIZE, %ebp
                   1010:        .align  16
                   1011: 1:
                   1012:        movl    0(%esi), %eax
                   1013:        movl    4(%esi), %ebx
                   1014:        movl    8(%esi), %ecx
                   1015:        movl    12(%esi), %edx
                   1016:        movnti  %eax, 0(%edi)
                   1017:        movnti  %ebx, 4(%edi)
                   1018:        movnti  %ecx, 8(%edi)
                   1019:        movnti  %edx, 12(%edi)
                   1020:        subl    $16, %ebp
                   1021:        leal    16(%esi), %esi
                   1022:        leal    16(%edi), %edi
                   1023:        jnz     1b
                   1024:        sfence
                   1025:        popl    %edi
                   1026:        popl    %esi
                   1027:        popl    %ebx
                   1028:        popl    %ebp
                   1029:        ret

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