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Annotation of src/sys/arch/i386/i386/locore.S, Revision 1.59

1.59    ! lukem       1: /*     $NetBSD: locore.S,v 1.58 2007/12/03 19:06:36 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:
1.59    ! lukem     113: #include <machine/asm.h>
        !           114: __KERNEL_RCSID(0, "$NetBSD$");
        !           115:
1.18      christos  116: #include "opt_compat_oldboot.h"
1.1       fvdl      117: #include "opt_ddb.h"
                    118: #include "opt_realmem.h"
1.18      christos  119: #include "opt_vm86.h"
1.1       fvdl      120:
                    121: #include "npx.h"
                    122: #include "assym.h"
                    123: #include "lapic.h"
                    124: #include "ioapic.h"
1.8       fvdl      125: #include "ksyms.h"
1.1       fvdl      126:
                    127: #include <sys/errno.h>
                    128: #include <sys/syscall.h>
                    129:
                    130: #include <machine/cputypes.h>
                    131: #include <machine/segments.h>
                    132: #include <machine/specialreg.h>
                    133: #include <machine/trap.h>
                    134: #include <machine/i82489reg.h>
1.37      jmmv      135: #include <machine/multiboot.h>
1.48      yamt      136: #include <machine/frameasm.h>
                    137: #include <machine/i82489reg.h>
1.1       fvdl      138:
                    139: /* XXX temporary kluge; these should not be here */
                    140: /* Get definitions for IOM_BEGIN, IOM_END, and IOM_SIZE */
                    141: #include <dev/isa/isareg.h>
                    142:
                    143: /*
                    144:  * Initialization
                    145:  */
                    146:        .data
                    147:
                    148:        .globl  _C_LABEL(cpu)
1.38      jmmv      149:        .globl  _C_LABEL(esym)
                    150:        .globl  _C_LABEL(atdevbase)
1.40      yamt      151:        .globl  _C_LABEL(proc0uarea),_C_LABEL(PDPpaddr)
1.1       fvdl      152:        .globl  _C_LABEL(gdt)
                    153:        .globl  _C_LABEL(idt)
1.30      junyoung  154:        .globl  _C_LABEL(lapic_tpr)
                    155:
1.1       fvdl      156: #if NLAPIC > 0
                    157: #ifdef __ELF__
1.7       thorpej   158:        .align  PAGE_SIZE
1.1       fvdl      159: #else
                    160:        .align  12
                    161: #endif
                    162:        .globl _C_LABEL(local_apic), _C_LABEL(lapic_id)
                    163: _C_LABEL(local_apic):
                    164:        .space  LAPIC_ID
1.30      junyoung  165: _C_LABEL(lapic_id):
1.1       fvdl      166:        .long   0x00000000
                    167:        .space  LAPIC_TPRI-(LAPIC_ID+4)
1.30      junyoung  168: _C_LABEL(lapic_tpr):
1.1       fvdl      169:        .space  LAPIC_PPRI-LAPIC_TPRI
1.30      junyoung  170: _C_LABEL(lapic_ppr):
1.1       fvdl      171:        .space  LAPIC_ISR-LAPIC_PPRI
                    172: _C_LABEL(lapic_isr):
1.7       thorpej   173:        .space  PAGE_SIZE-LAPIC_ISR
1.1       fvdl      174: #else
1.30      junyoung  175: _C_LABEL(lapic_tpr):
1.1       fvdl      176:        .long 0
                    177: #endif
1.30      junyoung  178:
1.48      yamt      179: _C_LABEL(cpu):         .long   0       # are we 80486, Pentium, or..
1.1       fvdl      180: _C_LABEL(atdevbase):   .long   0       # location of start of iomem in virtual
1.40      yamt      181: _C_LABEL(proc0uarea):  .long   0
1.31      junyoung  182: _C_LABEL(PDPpaddr):    .long   0       # paddr of PDP, for libkvm
1.53      yamt      183: _C_LABEL(tablesize):   .long   0
1.30      junyoung  184:
1.1       fvdl      185:        .space 512
                    186: tmpstk:
                    187:
                    188:
1.35      yamt      189: #define        _RELOC(x)       ((x) - KERNBASE)
1.1       fvdl      190: #define        RELOC(x)        _RELOC(_C_LABEL(x))
                    191:
                    192:        .text
                    193:        .globl  _C_LABEL(kernel_text)
                    194:        .set    _C_LABEL(kernel_text),KERNTEXTOFF
                    195:
                    196:        .globl  start
                    197: start: movw    $0x1234,0x472                   # warm boot
                    198:
1.37      jmmv      199: #if defined(MULTIBOOT)
                    200:        jmp     1f
                    201:
                    202:        .align  4
                    203:        .globl  Multiboot_Header
                    204: _C_LABEL(Multiboot_Header):
1.44      jmmv      205: #define MULTIBOOT_HEADER_FLAGS (MULTIBOOT_HEADER_WANT_MEMORY)
1.37      jmmv      206:        .long   MULTIBOOT_HEADER_MAGIC
                    207:        .long   MULTIBOOT_HEADER_FLAGS
                    208:        .long   -(MULTIBOOT_HEADER_MAGIC + MULTIBOOT_HEADER_FLAGS)
                    209:
                    210: 1:
                    211:        /* Check if we are being executed by a Multiboot-compliant boot
                    212:         * loader. */
                    213:        cmpl    $MULTIBOOT_INFO_MAGIC,%eax
                    214:        jne     1f
                    215:
1.43      mrg       216:        /*
                    217:         * Indeed, a multiboot-compliant boot loader executed us.  We copy
1.37      jmmv      218:         * the received Multiboot information structure into kernel's data
                    219:         * space to process it later -- after we are relocated.  It will
1.43      mrg       220:         * be safer to run complex C code than doing it at this point.
                    221:         */
1.37      jmmv      222:        pushl   %ebx            # Address of Multiboot information
                    223:        call    _C_LABEL(multiboot_pre_reloc)
                    224:        addl    $4,%esp
1.38      jmmv      225:        jmp     2f
1.37      jmmv      226: #endif
                    227:
                    228: 1:
1.1       fvdl      229:        /*
1.38      jmmv      230:         * At this point, we know that a NetBSD-specific boot loader
                    231:         * booted this kernel.  The stack carries the following parameters:
1.41      jmmv      232:         * (boothowto, [bootdev], bootinfo, esym, biosextmem, biosbasemem),
1.38      jmmv      233:         * 4 bytes each.
1.1       fvdl      234:         */
1.38      jmmv      235:        addl    $4,%esp         # Discard return address to boot loader
                    236:        call    _C_LABEL(native_loader)
                    237:        addl    $24,%esp
1.1       fvdl      238:
                    239: 2:
                    240:        /* First, reset the PSL. */
                    241:        pushl   $PSL_MBO
                    242:        popfl
                    243:
                    244:        /* Clear segment registers; always null in proc0. */
                    245:        xorl    %eax,%eax
                    246:        movw    %ax,%fs
                    247:        movw    %ax,%gs
                    248:        decl    %eax
                    249:        movl    %eax,RELOC(cpu_info_primary)+CPU_INFO_LEVEL
                    250:
                    251:        /* Find out our CPU type. */
                    252:
                    253: try386:        /* Try to toggle alignment check flag; does not exist on 386. */
                    254:        pushfl
                    255:        popl    %eax
                    256:        movl    %eax,%ecx
                    257:        orl     $PSL_AC,%eax
                    258:        pushl   %eax
                    259:        popfl
                    260:        pushfl
                    261:        popl    %eax
                    262:        xorl    %ecx,%eax
                    263:        andl    $PSL_AC,%eax
                    264:        pushl   %ecx
                    265:        popfl
                    266:
                    267:        testl   %eax,%eax
                    268:        jnz     try486
                    269:
                    270:        /*
                    271:         * Try the test of a NexGen CPU -- ZF will not change on a DIV
                    272:         * instruction on a NexGen, it will on an i386.  Documented in
                    273:         * Nx586 Processor Recognition Application Note, NexGen, Inc.
                    274:         */
                    275:        movl    $0x5555,%eax
                    276:        xorl    %edx,%edx
                    277:        movl    $2,%ecx
                    278:        divl    %ecx
                    279:        jnz     is386
                    280:
                    281: isnx586:
                    282:        /*
                    283:         * Don't try cpuid, as Nx586s reportedly don't support the
                    284:         * PSL_ID bit.
                    285:         */
                    286:        movl    $CPU_NX586,RELOC(cpu)
                    287:        jmp     2f
                    288:
                    289: is386:
                    290:        movl    $CPU_386,RELOC(cpu)
                    291:        jmp     2f
                    292:
                    293: try486:        /* Try to toggle identification flag; does not exist on early 486s. */
                    294:        pushfl
                    295:        popl    %eax
                    296:        movl    %eax,%ecx
                    297:        xorl    $PSL_ID,%eax
                    298:        pushl   %eax
                    299:        popfl
                    300:        pushfl
                    301:        popl    %eax
                    302:        xorl    %ecx,%eax
                    303:        andl    $PSL_ID,%eax
                    304:        pushl   %ecx
                    305:        popfl
                    306:
                    307:        testl   %eax,%eax
                    308:        jnz     try586
                    309: is486: movl    $CPU_486,RELOC(cpu)
                    310:        /*
                    311:         * Check Cyrix CPU
                    312:         * Cyrix CPUs do not change the undefined flags following
                    313:         * execution of the divide instruction which divides 5 by 2.
                    314:         *
                    315:         * Note: CPUID is enabled on M2, so it passes another way.
                    316:         */
                    317:        pushfl
                    318:        movl    $0x5555, %eax
                    319:        xorl    %edx, %edx
                    320:        movl    $2, %ecx
                    321:        clc
                    322:        divl    %ecx
                    323:        jnc     trycyrix486
                    324:        popfl
                    325:        jmp 2f
                    326: trycyrix486:
                    327:        movl    $CPU_6x86,RELOC(cpu)    # set CPU type
                    328:        /*
                    329:         * Check for Cyrix 486 CPU by seeing if the flags change during a
                    330:         * divide. This is documented in the Cx486SLC/e SMM Programmer's
                    331:         * Guide.
                    332:         */
                    333:        xorl    %edx,%edx
                    334:        cmpl    %edx,%edx               # set flags to known state
                    335:        pushfl
                    336:        popl    %ecx                    # store flags in ecx
                    337:        movl    $-1,%eax
                    338:        movl    $4,%ebx
                    339:        divl    %ebx                    # do a long division
                    340:        pushfl
                    341:        popl    %eax
                    342:        xorl    %ecx,%eax               # are the flags different?
                    343:        testl   $0x8d5,%eax             # only check C|PF|AF|Z|N|V
                    344:        jne     2f                      # yes; must be Cyrix 6x86 CPU
                    345:        movl    $CPU_486DLC,RELOC(cpu)  # set CPU type
                    346:
                    347: #ifndef CYRIX_CACHE_WORKS
                    348:        /* Disable caching of the ISA hole only. */
                    349:        invd
                    350:        movb    $CCR0,%al               # Configuration Register index (CCR0)
                    351:        outb    %al,$0x22
                    352:        inb     $0x23,%al
                    353:        orb     $(CCR0_NC1|CCR0_BARB),%al
                    354:        movb    %al,%ah
                    355:        movb    $CCR0,%al
                    356:        outb    %al,$0x22
                    357:        movb    %ah,%al
                    358:        outb    %al,$0x23
                    359:        invd
                    360: #else /* CYRIX_CACHE_WORKS */
                    361:        /* Set cache parameters */
                    362:        invd                            # Start with guaranteed clean cache
                    363:        movb    $CCR0,%al               # Configuration Register index (CCR0)
                    364:        outb    %al,$0x22
                    365:        inb     $0x23,%al
                    366:        andb    $~CCR0_NC0,%al
                    367: #ifndef CYRIX_CACHE_REALLY_WORKS
                    368:        orb     $(CCR0_NC1|CCR0_BARB),%al
                    369: #else
                    370:        orb     $CCR0_NC1,%al
                    371: #endif
                    372:        movb    %al,%ah
                    373:        movb    $CCR0,%al
                    374:        outb    %al,$0x22
                    375:        movb    %ah,%al
                    376:        outb    %al,$0x23
                    377:        /* clear non-cacheable region 1 */
                    378:        movb    $(NCR1+2),%al
                    379:        outb    %al,$0x22
                    380:        movb    $NCR_SIZE_0K,%al
                    381:        outb    %al,$0x23
                    382:        /* clear non-cacheable region 2 */
                    383:        movb    $(NCR2+2),%al
                    384:        outb    %al,$0x22
                    385:        movb    $NCR_SIZE_0K,%al
                    386:        outb    %al,$0x23
                    387:        /* clear non-cacheable region 3 */
                    388:        movb    $(NCR3+2),%al
                    389:        outb    %al,$0x22
                    390:        movb    $NCR_SIZE_0K,%al
                    391:        outb    %al,$0x23
                    392:        /* clear non-cacheable region 4 */
                    393:        movb    $(NCR4+2),%al
                    394:        outb    %al,$0x22
                    395:        movb    $NCR_SIZE_0K,%al
                    396:        outb    %al,$0x23
                    397:        /* enable caching in CR0 */
                    398:        movl    %cr0,%eax
                    399:        andl    $~(CR0_CD|CR0_NW),%eax
                    400:        movl    %eax,%cr0
                    401:        invd
                    402: #endif /* CYRIX_CACHE_WORKS */
                    403:
                    404:        jmp     2f
                    405:
                    406: try586:        /* Use the `cpuid' instruction. */
                    407:        xorl    %eax,%eax
                    408:        cpuid
                    409:        movl    %eax,RELOC(cpu_info_primary)+CPU_INFO_LEVEL
                    410:
                    411: 2:
                    412:        /*
                    413:         * Finished with old stack; load new %esp now instead of later so we
                    414:         * can trace this code without having to worry about the trace trap
                    415:         * clobbering the memory test or the zeroing of the bss+bootstrap page
                    416:         * tables.
                    417:         *
                    418:         * The boot program should check:
                    419:         *      text+data <= &stack_variable - more_space_for_stack
                    420:         *      text+data+bss+pad+space_for_page_tables <= end_of_memory
                    421:         * Oops, the gdt is in the carcass of the boot program so clearing
                    422:         * the rest of memory is still not possible.
                    423:         */
                    424:        movl    $_RELOC(tmpstk),%esp    # bootstrap stack end location
                    425:
                    426: /*
                    427:  * Virtual address space of kernel:
                    428:  *
1.53      yamt      429:  * text | data | bss | [syms] | page dir | proc0 kstack | L1 ptp
1.1       fvdl      430:  *                           0          1       2      3
                    431:  */
1.53      yamt      432:
                    433: #define        PROC0_PDIR_OFF  0
                    434: #define        PROC0_STK_OFF   (PROC0_PDIR_OFF + PAGE_SIZE)
                    435: #define        PROC0_PTP1_OFF  (PROC0_STK_OFF + UPAGES * PAGE_SIZE)
                    436:
                    437: /*
                    438:  * fillkpt
                    439:  *     eax = pte (page frame | control | status)
                    440:  *     ebx = page table address
                    441:  *     ecx = number of pages to map
                    442:  */
                    443:
                    444: #define fillkpt        \
                    445: 1:     movl    %eax,(%ebx)     ;       /* store phys addr */ \
                    446:        addl    $4,%ebx         ;       /* next pte/pde */ \
                    447:        addl    $PAGE_SIZE,%eax ;       /* next phys page */ \
                    448:        loop    1b              ;  \
                    449:
1.1       fvdl      450:
                    451:        /* Find end of kernel image. */
                    452:        movl    $RELOC(end),%edi
1.8       fvdl      453: #if (NKSYMS || defined(DDB) || defined(LKM)) && !defined(SYMTAB_SPACE)
1.1       fvdl      454:        /* Save the symbols (if loaded). */
                    455:        movl    RELOC(esym),%eax
                    456:        testl   %eax,%eax
                    457:        jz      1f
1.35      yamt      458:        subl    $KERNBASE,%eax
1.1       fvdl      459:        movl    %eax,%edi
                    460: 1:
                    461: #endif
                    462:
1.53      yamt      463:        /* Compute sizes */
1.1       fvdl      464:        movl    %edi,%esi                       # edi = esym ? esym : end
                    465:        addl    $PGOFSET,%esi                   # page align up
                    466:        andl    $~PGOFSET,%esi
                    467:
1.53      yamt      468:        /* nkptp[1] = (esi + ~L2_FRAME) >> L2_SHIFT + 1; */
                    469:        movl    %esi,%eax
                    470:        addl    $~L2_FRAME,%eax
                    471:        shrl    $L2_SHIFT,%eax
                    472:        incl    %eax            /* one more ptp for VAs stolen by bootstrap */
                    473: 1:     movl    %eax,RELOC(nkptp)+1*4
                    474:
                    475:        /* tablesize = (1 + UPAGES + nkptp) << PGSHIFT; */
                    476:        addl    $(1+UPAGES),%eax
                    477:        shll    $PGSHIFT,%eax
                    478:        movl    %eax,RELOC(tablesize)
                    479:
                    480:        /* ensure that nkptp covers bootstrap tables */
                    481:        addl    %esi,%eax
                    482:        addl    $~L2_FRAME,%eax
                    483:        shrl    $L2_SHIFT,%eax
                    484:        incl    %eax
                    485:        cmpl    %eax,RELOC(nkptp)+1*4
                    486:        jnz     1b
                    487:
                    488:        /* Clear tables */
                    489:        movl    %esi,%edi
1.1       fvdl      490:        xorl    %eax,%eax
                    491:        cld
1.53      yamt      492:        movl    RELOC(tablesize),%ecx
                    493:        shrl    $2,%ecx
1.1       fvdl      494:        rep
                    495:        stosl
                    496:
1.53      yamt      497:        leal    (PROC0_PTP1_OFF)(%esi), %ebx
1.1       fvdl      498:
                    499: /*
                    500:  * Build initial page tables.
                    501:  */
1.53      yamt      502:        /*
                    503:         * Compute &__data_start - KERNBASE. This can't be > 4G,
                    504:         * or we can't deal with it anyway, since we can't load it in
                    505:         * 32 bit mode. So use the bottom 32 bits.
                    506:         */
                    507:        movl    $RELOC(__data_start),%edx
1.1       fvdl      508:        andl    $~PGOFSET,%edx
1.30      junyoung  509:
1.53      yamt      510:        /*
                    511:         * Skip the first MB.
                    512:         */
1.1       fvdl      513:        movl    $_RELOC(KERNTEXTOFF),%eax
                    514:        movl    %eax,%ecx
1.53      yamt      515:        shrl    $(PGSHIFT-2),%ecx       /* ((n >> PGSHIFT) << 2) for # pdes */
                    516:        addl    %ecx,%ebx
1.1       fvdl      517:
                    518:        /* Map the kernel text read-only. */
                    519:        movl    %edx,%ecx
                    520:        subl    %eax,%ecx
                    521:        shrl    $PGSHIFT,%ecx
                    522:        orl     $(PG_V|PG_KR),%eax
                    523:        fillkpt
                    524:
                    525:        /* Map the data, BSS, and bootstrap tables read-write. */
                    526:        leal    (PG_V|PG_KW)(%edx),%eax
1.53      yamt      527:        movl    RELOC(tablesize),%ecx
1.1       fvdl      528:        addl    %esi,%ecx                               # end of tables
                    529:        subl    %edx,%ecx                               # subtract end of text
                    530:        shrl    $PGSHIFT,%ecx
                    531:        fillkpt
                    532:
1.53      yamt      533:        /* Map ISA I/O mem (later atdevbase) */
1.1       fvdl      534:        movl    $(IOM_BEGIN|PG_V|PG_KW/*|PG_N*/),%eax   # having these bits set
                    535:        movl    $(IOM_SIZE>>PGSHIFT),%ecx               # for this many pte s,
                    536:        fillkpt
                    537:
                    538: /*
                    539:  * Construct a page table directory.
                    540:  */
1.53      yamt      541:        /* Set up top level entries for identity mapping */
                    542:        leal    (PROC0_PDIR_OFF)(%esi),%ebx
                    543:        leal    (PROC0_PTP1_OFF)(%esi),%eax
                    544:        orl     $(PG_V|PG_KW), %eax
                    545:        movl    RELOC(nkptp)+1*4,%ecx
1.1       fvdl      546:        fillkpt
                    547:
1.53      yamt      548:        /* Set up top level entries for actual kernel mapping */
                    549:        leal    (PROC0_PDIR_OFF + L2_SLOT_KERNBASE*4)(%esi),%ebx
                    550:        leal    (PROC0_PTP1_OFF)(%esi),%eax
                    551:        orl     $(PG_V|PG_KW), %eax
                    552:        movl    RELOC(nkptp)+1*4,%ecx
1.1       fvdl      553:        fillkpt
                    554:
                    555:        /* Install a PDE recursively mapping page directory as a page table! */
1.53      yamt      556:        leal    (PROC0_PDIR_OFF + PDIR_SLOT_PTE*4)(%esi),%ebx
                    557:        leal    (PROC0_PDIR_OFF)(%esi),%eax
                    558:        orl     $(PG_V|PG_KW),%eax
                    559:        movl    %eax,(%ebx)
                    560:
1.1       fvdl      561:
1.31      junyoung  562:        /* Save phys. addr of PDP, for libkvm. */
                    563:        movl    %esi,RELOC(PDPpaddr)
1.1       fvdl      564:
1.53      yamt      565:        /*
                    566:         * Startup checklist:
                    567:         * 1. Load %cr3 with pointer to PDIR.
                    568:         */
1.1       fvdl      569:        movl    %esi,%eax               # phys address of ptd in proc 0
                    570:        movl    %eax,%cr3               # load ptd addr into mmu
1.53      yamt      571:
                    572:        /*
                    573:         * 2. Enable paging and the rest of it.
                    574:         */
1.1       fvdl      575:        movl    %cr0,%eax               # get control word
                    576:                                        # enable paging & NPX emulation
                    577:        orl     $(CR0_PE|CR0_PG|CR0_NE|CR0_TS|CR0_EM|CR0_MP),%eax
                    578:        movl    %eax,%cr0               # and let's page NOW!
                    579:
                    580:        pushl   $begin                  # jump to high mem
                    581:        ret
                    582:
                    583: begin:
1.53      yamt      584:        /*
                    585:         * We have arrived.
                    586:         * There's no need anymore for the identity mapping in low
                    587:         * memory, remove it.
                    588:         */
                    589:        movl    _C_LABEL(nkptp)+1*4,%ecx
                    590:        leal    (PROC0_PDIR_OFF)(%esi),%ebx     # old, phys  address of PDIR
                    591:        addl    $(KERNBASE), %ebx       # new, virtual address of PDIR
1.1       fvdl      592: 1:     movl    $0,(%ebx)
1.53      yamt      593:        addl    $4,%ebx
1.1       fvdl      594:        loop    1b
                    595:
                    596:        /* Relocate atdevbase. */
1.53      yamt      597:        movl    $KERNBASE,%edx
                    598:        addl    _C_LABEL(tablesize),%edx
1.1       fvdl      599:        addl    %esi,%edx
                    600:        movl    %edx,_C_LABEL(atdevbase)
                    601:
                    602:        /* Set up bootstrap stack. */
1.53      yamt      603:        leal    (PROC0_STK_OFF+KERNBASE)(%esi),%eax
1.40      yamt      604:        movl    %eax,_C_LABEL(proc0uarea)
                    605:        leal    (KSTACK_SIZE-FRAMESIZE)(%eax),%esp
                    606:        movl    %esi,(KSTACK_SIZE+PCB_CR3)(%eax)        # pcb->pcb_cr3
1.1       fvdl      607:        xorl    %ebp,%ebp               # mark end of frames
                    608:
1.37      jmmv      609: #if defined(MULTIBOOT)
                    610:        /* It is now safe to parse the Multiboot information structure
                    611:         * we saved before from C code.  Note that we cannot delay its
                    612:         * parsing any more because initgdt (called below) needs to make
                    613:         * use of this information. */
                    614:        call    _C_LABEL(multiboot_post_reloc)
                    615: #endif
                    616:
1.1       fvdl      617:        subl    $NGDT*8, %esp           # space for temporary gdt
                    618:        pushl   %esp
                    619:        call    _C_LABEL(initgdt)
                    620:        addl    $4,%esp
1.30      junyoung  621:
1.53      yamt      622:        movl    _C_LABEL(tablesize),%eax
1.1       fvdl      623:        addl    %esi,%eax               # skip past stack and page tables
                    624:
                    625:        pushl   %eax
                    626:        call    _C_LABEL(init386)       # wire 386 chip for unix operation
                    627:        addl    $4+NGDT*8,%esp          # pop temporary gdt
                    628:
                    629: #ifdef SAFARI_FIFO_HACK
                    630:        movb    $5,%al
                    631:        movw    $0x37b,%dx
                    632:        outb    %al,%dx
                    633:        movw    $0x37f,%dx
                    634:        inb     %dx,%al
                    635:        movb    %al,%cl
                    636:
                    637:        orb     $1,%cl
                    638:
                    639:        movb    $5,%al
                    640:        movw    $0x37b,%dx
                    641:        outb    %al,%dx
                    642:        movw    $0x37f,%dx
                    643:        movb    %cl,%al
                    644:        outb    %al,%dx
                    645: #endif /* SAFARI_FIFO_HACK */
                    646:
                    647:        call    _C_LABEL(main)
                    648:
                    649: /*
1.48      yamt      650:  * void lwp_trampoline(void);
                    651:  *
1.1       fvdl      652:  * This is a trampoline function pushed onto the stack of a newly created
                    653:  * process in order to do some additional setup.  The trampoline is entered by
                    654:  * cpu_switch()ing to the process, so we abuse the callee-saved registers used
                    655:  * by cpu_switch() to store the information about the stub to call.
                    656:  * NOTE: This function does not have a normal calling sequence!
                    657:  */
1.48      yamt      658: NENTRY(lwp_trampoline)
                    659:        pushl   %ebp
                    660:        xorl    %ebp,%ebp
                    661:        pushl   %eax
                    662:        call    _C_LABEL(lwp_startup)
                    663:        addl    $8,%esp
1.1       fvdl      664:        pushl   %ebx
                    665:        call    *%esi
                    666:        addl    $4,%esp
1.53      yamt      667:        DO_DEFERRED_SWITCH
1.1       fvdl      668:        INTRFASTEXIT
                    669:        /* NOTREACHED */
                    670:
                    671: /*
1.48      yamt      672:  * sigcode()
                    673:  *
                    674:  * Signal trampoline; copied to top of user stack.  Used only for
                    675:  * compatibility with old releases of NetBSD.
1.1       fvdl      676:  */
                    677: NENTRY(sigcode)
                    678:        /*
                    679:         * Handler has returned here as if we called it.  The sigcontext
                    680:         * is on the stack after the 3 args "we" pushed.
                    681:         */
                    682:        leal    12(%esp),%eax           # get pointer to sigcontext
                    683:        movl    %eax,4(%esp)            # put it in the argument slot
                    684:                                        # fake return address already there
1.17      christos  685:        movl    $SYS_compat_16___sigreturn14,%eax
1.1       fvdl      686:        int     $0x80                   # enter kernel with args on stack
                    687:        movl    $SYS_exit,%eax
                    688:        int     $0x80                   # exit if sigreturn fails
                    689:        .globl  _C_LABEL(esigcode)
                    690: _C_LABEL(esigcode):
                    691:
                    692: /*
1.48      yamt      693:  * int setjmp(label_t *)
                    694:  *
                    695:  * Used primarily by DDB.
1.1       fvdl      696:  */
                    697: ENTRY(setjmp)
                    698:        movl    4(%esp),%eax
                    699:        movl    %ebx,(%eax)             # save ebx
                    700:        movl    %esp,4(%eax)            # save esp
                    701:        movl    %ebp,8(%eax)            # save ebp
                    702:        movl    %esi,12(%eax)           # save esi
                    703:        movl    %edi,16(%eax)           # save edi
                    704:        movl    (%esp),%edx             # get rta
                    705:        movl    %edx,20(%eax)           # save eip
1.48      yamt      706:        xorl    %eax,%eax               # return 0
1.1       fvdl      707:        ret
                    708:
1.48      yamt      709: /*
                    710:  * int longjmp(label_t *)
                    711:  *
                    712:  * Used primarily by DDB.
                    713:  */
1.1       fvdl      714: ENTRY(longjmp)
                    715:        movl    4(%esp),%eax
                    716:        movl    (%eax),%ebx             # restore ebx
                    717:        movl    4(%eax),%esp            # restore esp
                    718:        movl    8(%eax),%ebp            # restore ebp
                    719:        movl    12(%eax),%esi           # restore esi
                    720:        movl    16(%eax),%edi           # restore edi
                    721:        movl    20(%eax),%edx           # get rta
                    722:        movl    %edx,(%esp)             # put in return frame
1.48      yamt      723:        movl    $1,%eax                 # return 1
1.1       fvdl      724:        ret
                    725:
                    726: /*
1.58      ad        727:  * struct lwp *cpu_switchto(struct lwp *oldlwp, struct newlwp,
                    728:  *                         bool returning)
1.30      junyoung  729:  *
1.48      yamt      730:  *     1. if (oldlwp != NULL), save its context.
                    731:  *     2. then, restore context of newlwp.
                    732:  *
                    733:  * Note that the stack frame layout is known to "struct switchframe" in
                    734:  * <machine/frame.h> and to the code in cpu_lwp_fork() which initializes
1.5       thorpej   735:  * it for a new lwp.
1.1       fvdl      736:  */
1.48      yamt      737: ENTRY(cpu_switchto)
1.1       fvdl      738:        pushl   %ebx
                    739:        pushl   %esi
                    740:        pushl   %edi
                    741:
1.48      yamt      742:        movl    16(%esp),%esi           # oldlwp
                    743:        movl    20(%esp),%edi           # newlwp
1.58      ad        744:        movl    24(%esp),%edx           # returning
1.48      yamt      745:        testl   %esi,%esi
                    746:        jz      1f
1.1       fvdl      747:
1.48      yamt      748:        /* Save old context. */
                    749:        movl    L_ADDR(%esi),%eax
                    750:        movl    %esp,PCB_ESP(%eax)
                    751:        movl    %ebp,PCB_EBP(%eax)
                    752:
                    753:        /* Switch to newlwp's stack. */
                    754: 1:     movl    L_ADDR(%edi),%ebx
                    755:        movl    PCB_EBP(%ebx),%ebp
                    756:        movl    PCB_ESP(%ebx),%esp
1.1       fvdl      757:
1.58      ad        758:        /* Set curlwp. */
                    759:        movl    %edi,CPUVAR(CURLWP)
                    760:
                    761:        /* Skip the rest if returning to a pinned LWP. */
                    762:        testl   %edx,%edx
                    763:        jnz     4f
                    764:
1.48      yamt      765:        /* Switch TSS.  Reset "task busy" flag before loading. */
1.26      yamt      766:        movl    %cr3,%eax
1.48      yamt      767:        movl    %eax,PCB_CR3(%ebx)      # for TSS gates
1.54      ad        768:        movl    CPUVAR(GDT),%ecx
1.48      yamt      769:        movl    L_MD_TSS_SEL(%edi),%edx
1.54      ad        770:        andl    $~0x0200,4(%ecx,%edx, 1)
1.1       fvdl      771:        ltr     %dx
                    772:
                    773:        /* Don't bother with the rest if switching to a system process. */
1.48      yamt      774:        testl   $LW_SYSTEM,L_FLAG(%edi)
                    775:        jnz     4f
1.1       fvdl      776:
1.54      ad        777:        /* Restore thread-private %fs/%gs descriptors. */
1.55      ad        778:        movl    PCB_FSD(%ebx), %eax
                    779:        movl    PCB_FSD+4(%ebx), %edx
1.54      ad        780:        movl    %eax, (GUFS_SEL*8)(%ecx)
                    781:        movl    %edx, (GUFS_SEL*8+4)(%ecx)
1.55      ad        782:        movl    PCB_GSD(%ebx), %eax
                    783:        movl    PCB_GSD+4(%ebx), %edx
1.54      ad        784:        movl    %eax, (GUGS_SEL*8)(%ecx)
                    785:        movl    %edx, (GUGS_SEL*8+4)(%ecx)
                    786:
1.56      ad        787:        /* Is this process using RAS (restartable atomic sequences)? */
                    788:        movl    L_PROC(%edi),%eax
                    789:        cmpl    $0,P_RASLIST(%eax)
                    790:        jne     5f
                    791:
1.48      yamt      792:        /*
                    793:         * Restore cr0 (including FPU state).  Raise the IPL to IPL_IPI.
                    794:         * FPU IPIs can alter the LWP's saved cr0.  Dropping the priority
                    795:         * is deferred until mi_switch(), when cpu_switchto() returns.
                    796:         */
                    797: 2:     movl    $IPL_IPI,CPUVAR(ILEVEL)
                    798:        movl    PCB_CR0(%ebx),%ecx
                    799:        movl    %cr0,%edx
1.1       fvdl      800:
1.30      junyoung  801:        /*
1.22      wiz       802:         * If our floating point registers are on a different CPU,
1.48      yamt      803:         * set CR0_TS so we'll trap rather than reuse bogus state.
1.1       fvdl      804:         */
1.48      yamt      805:        movl    PCB_FPCPU(%ebx),%eax
                    806:        cmpl    CPUVAR(SELF),%eax
                    807:        je      3f
1.1       fvdl      808:        orl     $CR0_TS,%ecx
1.48      yamt      809:
                    810:        /* Reloading CR0 is very expensive - avoid if possible. */
                    811: 3:     cmpl    %edx,%ecx
                    812:        je      4f
1.1       fvdl      813:        movl    %ecx,%cr0
                    814:
1.48      yamt      815:        /* Return to the new LWP, returning 'oldlwp' in %eax. */
                    816: 4:     movl    %esi,%eax
1.1       fvdl      817:        popl    %edi
                    818:        popl    %esi
                    819:        popl    %ebx
                    820:        ret
1.20      dsl       821:
1.48      yamt      822:        /* Check for restartable atomic sequences (RAS). */
                    823: 5:     movl    L_MD_REGS(%edi),%ecx
                    824:        pushl   TF_EIP(%ecx)
1.20      dsl       825:        pushl   %eax
                    826:        call    _C_LABEL(ras_lookup)
                    827:        addl    $8,%esp
                    828:        cmpl    $-1,%eax
1.48      yamt      829:        je      2b
1.49      ad        830:        movl    L_MD_REGS(%edi),%ecx
                    831:        movl    %eax,TF_EIP(%ecx)
1.48      yamt      832:        jmp     2b
1.1       fvdl      833:
                    834: /*
                    835:  * void savectx(struct pcb *pcb);
1.48      yamt      836:  *
1.1       fvdl      837:  * Update pcb, saving current processor state.
                    838:  */
                    839: ENTRY(savectx)
1.47      skrll     840:        movl    4(%esp),%edx            # edx = pcb
1.1       fvdl      841:        movl    %esp,PCB_ESP(%edx)
                    842:        movl    %ebp,PCB_EBP(%edx)
                    843:        ret
                    844:
                    845: /*
1.48      yamt      846:  * osyscall()
                    847:  *
1.1       fvdl      848:  * Old call gate entry for syscall
                    849:  */
                    850: IDTVEC(osyscall)
1.48      yamt      851:        pushfl                  # set eflags in trap frame
1.1       fvdl      852:        popl    8(%esp)
                    853:        pushl   $7              # size of instruction for restart
                    854:        jmp     syscall1
                    855:
                    856: /*
1.48      yamt      857:  * syscall()
                    858:  *
1.1       fvdl      859:  * Trap gate entry for syscall
                    860:  */
                    861: IDTVEC(syscall)
                    862:        pushl   $2              # size of instruction for restart
                    863: syscall1:
                    864:        pushl   $T_ASTFLT       # trap # for doing ASTs
                    865:        INTRENTRY
                    866:
                    867: #ifdef DIAGNOSTIC
1.24      yamt      868:        cmpl    $0, CPUVAR(WANT_PMAPLOAD)
                    869:        jz      1f
                    870:        pushl   $6f
                    871:        call    _C_LABEL(printf)
                    872:        addl    $4, %esp
                    873: 1:
1.1       fvdl      874:        movl    CPUVAR(ILEVEL),%ebx
                    875:        testl   %ebx,%ebx
                    876:        jz      1f
                    877:        pushl   $5f
                    878:        call    _C_LABEL(printf)
                    879:        addl    $4,%esp
                    880: #ifdef DDB
                    881:        int     $3
                    882: #endif
1.30      junyoung  883: 1:
1.1       fvdl      884: #endif /* DIAGNOSTIC */
1.5       thorpej   885:        movl    CPUVAR(CURLWP),%edx
                    886:        movl    %esp,L_MD_REGS(%edx)    # save pointer to frame
                    887:        movl    L_PROC(%edx),%edx
1.15      fvdl      888:        pushl   %esp
1.1       fvdl      889:        call    *P_MD_SYSCALL(%edx)     # get pointer to syscall() function
1.15      fvdl      890:        addl    $4,%esp
1.27      yamt      891: .Lsyscall_checkast:
1.24      yamt      892:        /* Check for ASTs on exit to user mode. */
1.1       fvdl      893:        cli
1.5       thorpej   894:        CHECK_ASTPENDING(%eax)
1.1       fvdl      895:        je      1f
                    896:        /* Always returning to user mode here. */
1.5       thorpej   897:        CLEAR_ASTPENDING(%eax)
1.1       fvdl      898:        sti
                    899:        /* Pushed T_ASTFLT into tf_trapno on entry. */
1.15      fvdl      900:        pushl   %esp
1.1       fvdl      901:        call    _C_LABEL(trap)
1.15      fvdl      902:        addl    $4,%esp
1.27      yamt      903:        jmp     .Lsyscall_checkast      /* re-check ASTs */
1.53      yamt      904: 1:     CHECK_DEFERRED_SWITCH
1.24      yamt      905:        jnz     9f
1.1       fvdl      906: #ifndef DIAGNOSTIC
1.24      yamt      907:        INTRFASTEXIT
1.1       fvdl      908: #else /* DIAGNOSTIC */
1.24      yamt      909:        cmpl    $IPL_NONE,CPUVAR(ILEVEL)
1.1       fvdl      910:        jne     3f
                    911:        INTRFASTEXIT
                    912: 3:     sti
                    913:        pushl   $4f
                    914:        call    _C_LABEL(printf)
                    915:        addl    $4,%esp
1.58      ad        916:        pushl   $IPL_NONE
                    917:        call    _C_LABEL(spllower)
                    918:        addl    $4,%esp
1.53      yamt      919:        jmp     .Lsyscall_checkast
1.1       fvdl      920: 4:     .asciz  "WARNING: SPL NOT LOWERED ON SYSCALL EXIT\n"
1.30      junyoung  921: 5:     .asciz  "WARNING: SPL NOT ZERO ON SYSCALL ENTRY\n"
                    922: 6:     .asciz  "WARNING: WANT PMAPLOAD ON SYSCALL ENTRY\n"
1.1       fvdl      923: #endif /* DIAGNOSTIC */
1.24      yamt      924: 9:     sti
                    925:        call    _C_LABEL(pmap_load)
1.27      yamt      926:        jmp     .Lsyscall_checkast      /* re-check ASTs */
1.1       fvdl      927:
                    928: #if NNPX > 0
                    929: /*
                    930:  * Special interrupt handlers.  Someday intr0-intr15 will be used to count
                    931:  * interrupts.  We'll still need a special exception 16 handler.  The busy
                    932:  * latch stuff in probintr() can be moved to npxprobe().
                    933:  */
                    934:
1.48      yamt      935: /*
                    936:  * void probeintr(void)
                    937:  */
1.1       fvdl      938: NENTRY(probeintr)
                    939:        ss
                    940:        incl    _C_LABEL(npx_intrs_while_probing)
                    941:        pushl   %eax
                    942:        movb    $0x20,%al       # EOI (asm in strings loses cpp features)
                    943:        outb    %al,$0xa0       # IO_ICU2
                    944:        outb    %al,$0x20       # IO_ICU1
                    945:        movb    $0,%al
                    946:        outb    %al,$0xf0       # clear BUSY# latch
                    947:        popl    %eax
                    948:        iret
                    949:
1.48      yamt      950: /*
                    951:  * void probetrap(void)
                    952:  */
1.1       fvdl      953: NENTRY(probetrap)
                    954:        ss
                    955:        incl    _C_LABEL(npx_traps_while_probing)
                    956:        fnclex
                    957:        iret
                    958:
1.48      yamt      959: /*
                    960:  * int npx586bug1(int a, int b)
                    961:  */
1.1       fvdl      962: NENTRY(npx586bug1)
                    963:        fildl   4(%esp)         # x
                    964:        fildl   8(%esp)         # y
                    965:        fld     %st(1)
                    966:        fdiv    %st(1),%st      # x/y
                    967:        fmulp   %st,%st(1)      # (x/y)*y
                    968:        fsubrp  %st,%st(1)      # x-(x/y)*y
                    969:        pushl   $0
                    970:        fistpl  (%esp)
                    971:        popl    %eax
                    972:        ret
                    973: #endif /* NNPX > 0 */
1.50      ad        974:
                    975: /*
                    976:  * void sse2_zero_page(void *pg)
                    977:  *
                    978:  * Zero a page without polluting the cache.
                    979:  */
                    980: ENTRY(sse2_zero_page)
                    981:        pushl   %ebp
                    982:        movl    %esp,%ebp
                    983:        movl    8(%esp), %edx
                    984:        movl    $PAGE_SIZE, %ecx
                    985:        xorl    %eax, %eax
                    986:        .align  16
                    987: 1:
                    988:        movnti  %eax, 0(%edx)
                    989:        movnti  %eax, 4(%edx)
                    990:        movnti  %eax, 8(%edx)
                    991:        movnti  %eax, 12(%edx)
                    992:        movnti  %eax, 16(%edx)
                    993:        movnti  %eax, 20(%edx)
                    994:        movnti  %eax, 24(%edx)
                    995:        movnti  %eax, 28(%edx)
                    996:        subl    $32, %ecx
                    997:        leal    32(%edx), %edx
                    998:        jnz     1b
                    999:        sfence
                   1000:        pop     %ebp
                   1001:        ret
                   1002:
                   1003: /*
                   1004:  * void sse2_copy_page(void *src, void *dst)
                   1005:  *
                   1006:  * Copy a page without polluting the cache.
                   1007:  */
                   1008: ENTRY(sse2_copy_page)
                   1009:        pushl   %ebp
                   1010:        pushl   %ebx
                   1011:        pushl   %esi
                   1012:        pushl   %edi
                   1013:        movl    20(%esp), %esi
                   1014:        movl    24(%esp), %edi
                   1015:        movl    $PAGE_SIZE, %ebp
                   1016:        .align  16
                   1017: 1:
                   1018:        movl    0(%esi), %eax
                   1019:        movl    4(%esi), %ebx
                   1020:        movl    8(%esi), %ecx
                   1021:        movl    12(%esi), %edx
                   1022:        movnti  %eax, 0(%edi)
                   1023:        movnti  %ebx, 4(%edi)
                   1024:        movnti  %ecx, 8(%edi)
                   1025:        movnti  %edx, 12(%edi)
                   1026:        subl    $16, %ebp
                   1027:        leal    16(%esi), %esi
                   1028:        leal    16(%edi), %edi
                   1029:        jnz     1b
                   1030:        sfence
                   1031:        popl    %edi
                   1032:        popl    %esi
                   1033:        popl    %ebx
                   1034:        popl    %ebp
                   1035:        ret

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