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Annotation of src/sys/arch/i386/i386/locore.S, Revision 1.45.2.3

1.45.2.3! yamt        1: /*     $NetBSD: locore.S,v 1.45.2.2 2007/02/17 15:19:52 yamt Exp $     */
1.1       fvdl        2:
                      3: /*-
1.32      mycroft     4:  * Copyright (c) 1998, 2000, 2004 The NetBSD Foundation, Inc.
1.1       fvdl        5:  * All rights reserved.
                      6:  *
                      7:  * This code is derived from software contributed to The NetBSD Foundation
                      8:  * by Charles M. Hannum.
                      9:  *
                     10:  * Redistribution and use in source and binary forms, with or without
                     11:  * modification, are permitted provided that the following conditions
                     12:  * are met:
                     13:  * 1. Redistributions of source code must retain the above copyright
                     14:  *    notice, this list of conditions and the following disclaimer.
                     15:  * 2. Redistributions in binary form must reproduce the above copyright
                     16:  *    notice, this list of conditions and the following disclaimer in the
                     17:  *    documentation and/or other materials provided with the distribution.
                     18:  * 3. All advertising materials mentioning features or use of this software
                     19:  *    must display the following acknowledgement:
                     20:  *        This product includes software developed by the NetBSD
                     21:  *        Foundation, Inc. and its contributors.
                     22:  * 4. Neither the name of The NetBSD Foundation nor the names of its
                     23:  *    contributors may be used to endorse or promote products derived
                     24:  *    from this software without specific prior written permission.
                     25:  *
                     26:  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
                     27:  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
                     28:  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
                     29:  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
                     30:  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
                     31:  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
                     32:  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
                     33:  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
                     34:  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
                     35:  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
                     36:  * POSSIBILITY OF SUCH DAMAGE.
                     37:  */
                     38:
                     39: /*-
                     40:  * Copyright (c) 1990 The Regents of the University of California.
                     41:  * All rights reserved.
                     42:  *
                     43:  * This code is derived from software contributed to Berkeley by
                     44:  * William Jolitz.
                     45:  *
                     46:  * Redistribution and use in source and binary forms, with or without
                     47:  * modification, are permitted provided that the following conditions
                     48:  * are met:
                     49:  * 1. Redistributions of source code must retain the above copyright
                     50:  *    notice, this list of conditions and the following disclaimer.
                     51:  * 2. Redistributions in binary form must reproduce the above copyright
                     52:  *    notice, this list of conditions and the following disclaimer in the
                     53:  *    documentation and/or other materials provided with the distribution.
1.12      agc        54:  * 3. Neither the name of the University nor the names of its contributors
1.1       fvdl       55:  *    may be used to endorse or promote products derived from this software
                     56:  *    without specific prior written permission.
                     57:  *
                     58:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
                     59:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     60:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     61:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
                     62:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     63:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     64:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     65:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     66:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     67:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     68:  * SUCH DAMAGE.
                     69:  *
                     70:  *     @(#)locore.s    7.3 (Berkeley) 5/13/91
                     71:  */
                     72:
1.18      christos   73: #include "opt_compat_netbsd.h"
                     74: #include "opt_compat_oldboot.h"
1.1       fvdl       75: #include "opt_cputype.h"
                     76: #include "opt_ddb.h"
                     77: #include "opt_ipkdb.h"
1.18      christos   78: #include "opt_lockdebug.h"
1.1       fvdl       79: #include "opt_multiprocessor.h"
                     80: #include "opt_realmem.h"
1.18      christos   81: #include "opt_user_ldt.h"
                     82: #include "opt_vm86.h"
1.1       fvdl       83:
                     84: #include "npx.h"
                     85: #include "assym.h"
                     86: #include "lapic.h"
                     87: #include "ioapic.h"
1.8       fvdl       88: #include "ksyms.h"
1.1       fvdl       89:
                     90: #include <sys/errno.h>
                     91: #include <sys/syscall.h>
                     92:
                     93: #include <machine/cputypes.h>
                     94: #include <machine/segments.h>
                     95: #include <machine/specialreg.h>
                     96: #include <machine/trap.h>
                     97:
                     98: #if NLAPIC > 0
                     99: #include <machine/i82489reg.h>
                    100: #endif
                    101:
1.37      jmmv      102: #include <machine/multiboot.h>
                    103:
1.1       fvdl      104: /* LINTSTUB: include <sys/types.h> */
                    105: /* LINTSTUB: include <machine/cpu.h> */
                    106: /* LINTSTUB: include <sys/systm.h> */
                    107:
                    108: #include <machine/asm.h>
                    109:
                    110: /* XXX temporary kluge; these should not be here */
                    111: /* Get definitions for IOM_BEGIN, IOM_END, and IOM_SIZE */
                    112: #include <dev/isa/isareg.h>
                    113:
                    114:
                    115: /* Disallow old names for REALBASEMEM */
                    116: #ifdef BIOSBASEMEM
                    117: #error BIOSBASEMEM option deprecated; use REALBASEMEM only if memory size reported by latest boot block is incorrect
                    118: #endif
                    119:
                    120: /* Disallow old names for REALEXTMEM */
                    121: #ifdef EXTMEM_SIZE
                    122: #error EXTMEM_SIZE option deprecated; use REALEXTMEM only if memory size reported by latest boot block is incorrect
                    123: #endif
                    124: #ifdef BIOSEXTMEM
                    125: #error BIOSEXTMEM option deprecated; use REALEXTMEM only if memory size reported by latest boot block is incorrect
                    126: #endif
                    127:
                    128: #include <machine/frameasm.h>
                    129:
                    130:
                    131: #ifdef MULTIPROCESSOR
                    132: #include <machine/i82489reg.h>
                    133: #endif
1.30      junyoung  134:
1.1       fvdl      135: /*
                    136:  * Initialization
                    137:  */
                    138:        .data
                    139:
                    140:        .globl  _C_LABEL(cpu)
1.38      jmmv      141:        .globl  _C_LABEL(esym)
                    142:        .globl  _C_LABEL(atdevbase)
1.40      yamt      143:        .globl  _C_LABEL(proc0uarea),_C_LABEL(PDPpaddr)
1.1       fvdl      144:        .globl  _C_LABEL(gdt)
                    145: #ifdef I586_CPU
                    146:        .globl  _C_LABEL(idt)
                    147: #endif
1.30      junyoung  148:        .globl  _C_LABEL(lapic_tpr)
                    149:
1.1       fvdl      150: #if NLAPIC > 0
                    151: #ifdef __ELF__
1.7       thorpej   152:        .align  PAGE_SIZE
1.1       fvdl      153: #else
                    154:        .align  12
                    155: #endif
                    156:        .globl _C_LABEL(local_apic), _C_LABEL(lapic_id)
                    157: _C_LABEL(local_apic):
                    158:        .space  LAPIC_ID
1.30      junyoung  159: _C_LABEL(lapic_id):
1.1       fvdl      160:        .long   0x00000000
                    161:        .space  LAPIC_TPRI-(LAPIC_ID+4)
1.30      junyoung  162: _C_LABEL(lapic_tpr):
1.1       fvdl      163:        .space  LAPIC_PPRI-LAPIC_TPRI
1.30      junyoung  164: _C_LABEL(lapic_ppr):
1.1       fvdl      165:        .space  LAPIC_ISR-LAPIC_PPRI
                    166: _C_LABEL(lapic_isr):
1.7       thorpej   167:        .space  PAGE_SIZE-LAPIC_ISR
1.1       fvdl      168: #else
1.30      junyoung  169: _C_LABEL(lapic_tpr):
1.1       fvdl      170:        .long 0
                    171: #endif
1.30      junyoung  172:
1.1       fvdl      173:
                    174: _C_LABEL(cpu):         .long   0       # are we 386, 386sx, or 486,
                    175:                                        #   or Pentium, or..
                    176: _C_LABEL(atdevbase):   .long   0       # location of start of iomem in virtual
1.40      yamt      177: _C_LABEL(proc0uarea):  .long   0
1.31      junyoung  178: _C_LABEL(PDPpaddr):    .long   0       # paddr of PDP, for libkvm
1.30      junyoung  179:
1.1       fvdl      180:        .space 512
                    181: tmpstk:
                    182:
                    183:
1.35      yamt      184: #define        _RELOC(x)       ((x) - KERNBASE)
1.1       fvdl      185: #define        RELOC(x)        _RELOC(_C_LABEL(x))
                    186:
                    187:        .text
                    188:        .globl  _C_LABEL(kernel_text)
                    189:        .set    _C_LABEL(kernel_text),KERNTEXTOFF
                    190:
                    191:        .globl  start
                    192: start: movw    $0x1234,0x472                   # warm boot
                    193:
1.37      jmmv      194: #if defined(MULTIBOOT)
                    195:        jmp     1f
                    196:
                    197:        .align  4
                    198:        .globl  Multiboot_Header
                    199: _C_LABEL(Multiboot_Header):
1.44      jmmv      200: #define MULTIBOOT_HEADER_FLAGS (MULTIBOOT_HEADER_WANT_MEMORY)
1.37      jmmv      201:        .long   MULTIBOOT_HEADER_MAGIC
                    202:        .long   MULTIBOOT_HEADER_FLAGS
                    203:        .long   -(MULTIBOOT_HEADER_MAGIC + MULTIBOOT_HEADER_FLAGS)
                    204:
                    205: 1:
                    206:        /* Check if we are being executed by a Multiboot-compliant boot
                    207:         * loader. */
                    208:        cmpl    $MULTIBOOT_INFO_MAGIC,%eax
                    209:        jne     1f
                    210:
1.43      mrg       211:        /*
                    212:         * Indeed, a multiboot-compliant boot loader executed us.  We copy
1.37      jmmv      213:         * the received Multiboot information structure into kernel's data
                    214:         * space to process it later -- after we are relocated.  It will
1.43      mrg       215:         * be safer to run complex C code than doing it at this point.
                    216:         */
1.37      jmmv      217:        pushl   %ebx            # Address of Multiboot information
                    218:        call    _C_LABEL(multiboot_pre_reloc)
                    219:        addl    $4,%esp
1.38      jmmv      220:        jmp     2f
1.37      jmmv      221: #endif
                    222:
                    223: 1:
1.1       fvdl      224:        /*
1.38      jmmv      225:         * At this point, we know that a NetBSD-specific boot loader
                    226:         * booted this kernel.  The stack carries the following parameters:
1.41      jmmv      227:         * (boothowto, [bootdev], bootinfo, esym, biosextmem, biosbasemem),
1.38      jmmv      228:         * 4 bytes each.
1.1       fvdl      229:         */
1.38      jmmv      230:        addl    $4,%esp         # Discard return address to boot loader
                    231:        call    _C_LABEL(native_loader)
                    232:        addl    $24,%esp
1.1       fvdl      233:
                    234: 2:
                    235:        /* First, reset the PSL. */
                    236:        pushl   $PSL_MBO
                    237:        popfl
                    238:
                    239:        /* Clear segment registers; always null in proc0. */
                    240:        xorl    %eax,%eax
                    241:        movw    %ax,%fs
                    242:        movw    %ax,%gs
                    243:        decl    %eax
                    244:        movl    %eax,RELOC(cpu_info_primary)+CPU_INFO_LEVEL
                    245:
                    246:        /* Find out our CPU type. */
                    247:
                    248: try386:        /* Try to toggle alignment check flag; does not exist on 386. */
                    249:        pushfl
                    250:        popl    %eax
                    251:        movl    %eax,%ecx
                    252:        orl     $PSL_AC,%eax
                    253:        pushl   %eax
                    254:        popfl
                    255:        pushfl
                    256:        popl    %eax
                    257:        xorl    %ecx,%eax
                    258:        andl    $PSL_AC,%eax
                    259:        pushl   %ecx
                    260:        popfl
                    261:
                    262:        testl   %eax,%eax
                    263:        jnz     try486
                    264:
                    265:        /*
                    266:         * Try the test of a NexGen CPU -- ZF will not change on a DIV
                    267:         * instruction on a NexGen, it will on an i386.  Documented in
                    268:         * Nx586 Processor Recognition Application Note, NexGen, Inc.
                    269:         */
                    270:        movl    $0x5555,%eax
                    271:        xorl    %edx,%edx
                    272:        movl    $2,%ecx
                    273:        divl    %ecx
                    274:        jnz     is386
                    275:
                    276: isnx586:
                    277:        /*
                    278:         * Don't try cpuid, as Nx586s reportedly don't support the
                    279:         * PSL_ID bit.
                    280:         */
                    281:        movl    $CPU_NX586,RELOC(cpu)
                    282:        jmp     2f
                    283:
                    284: is386:
                    285:        movl    $CPU_386,RELOC(cpu)
                    286:        jmp     2f
                    287:
                    288: try486:        /* Try to toggle identification flag; does not exist on early 486s. */
                    289:        pushfl
                    290:        popl    %eax
                    291:        movl    %eax,%ecx
                    292:        xorl    $PSL_ID,%eax
                    293:        pushl   %eax
                    294:        popfl
                    295:        pushfl
                    296:        popl    %eax
                    297:        xorl    %ecx,%eax
                    298:        andl    $PSL_ID,%eax
                    299:        pushl   %ecx
                    300:        popfl
                    301:
                    302:        testl   %eax,%eax
                    303:        jnz     try586
                    304: is486: movl    $CPU_486,RELOC(cpu)
                    305:        /*
                    306:         * Check Cyrix CPU
                    307:         * Cyrix CPUs do not change the undefined flags following
                    308:         * execution of the divide instruction which divides 5 by 2.
                    309:         *
                    310:         * Note: CPUID is enabled on M2, so it passes another way.
                    311:         */
                    312:        pushfl
                    313:        movl    $0x5555, %eax
                    314:        xorl    %edx, %edx
                    315:        movl    $2, %ecx
                    316:        clc
                    317:        divl    %ecx
                    318:        jnc     trycyrix486
                    319:        popfl
                    320:        jmp 2f
                    321: trycyrix486:
                    322:        movl    $CPU_6x86,RELOC(cpu)    # set CPU type
                    323:        /*
                    324:         * Check for Cyrix 486 CPU by seeing if the flags change during a
                    325:         * divide. This is documented in the Cx486SLC/e SMM Programmer's
                    326:         * Guide.
                    327:         */
                    328:        xorl    %edx,%edx
                    329:        cmpl    %edx,%edx               # set flags to known state
                    330:        pushfl
                    331:        popl    %ecx                    # store flags in ecx
                    332:        movl    $-1,%eax
                    333:        movl    $4,%ebx
                    334:        divl    %ebx                    # do a long division
                    335:        pushfl
                    336:        popl    %eax
                    337:        xorl    %ecx,%eax               # are the flags different?
                    338:        testl   $0x8d5,%eax             # only check C|PF|AF|Z|N|V
                    339:        jne     2f                      # yes; must be Cyrix 6x86 CPU
                    340:        movl    $CPU_486DLC,RELOC(cpu)  # set CPU type
                    341:
                    342: #ifndef CYRIX_CACHE_WORKS
                    343:        /* Disable caching of the ISA hole only. */
                    344:        invd
                    345:        movb    $CCR0,%al               # Configuration Register index (CCR0)
                    346:        outb    %al,$0x22
                    347:        inb     $0x23,%al
                    348:        orb     $(CCR0_NC1|CCR0_BARB),%al
                    349:        movb    %al,%ah
                    350:        movb    $CCR0,%al
                    351:        outb    %al,$0x22
                    352:        movb    %ah,%al
                    353:        outb    %al,$0x23
                    354:        invd
                    355: #else /* CYRIX_CACHE_WORKS */
                    356:        /* Set cache parameters */
                    357:        invd                            # Start with guaranteed clean cache
                    358:        movb    $CCR0,%al               # Configuration Register index (CCR0)
                    359:        outb    %al,$0x22
                    360:        inb     $0x23,%al
                    361:        andb    $~CCR0_NC0,%al
                    362: #ifndef CYRIX_CACHE_REALLY_WORKS
                    363:        orb     $(CCR0_NC1|CCR0_BARB),%al
                    364: #else
                    365:        orb     $CCR0_NC1,%al
                    366: #endif
                    367:        movb    %al,%ah
                    368:        movb    $CCR0,%al
                    369:        outb    %al,$0x22
                    370:        movb    %ah,%al
                    371:        outb    %al,$0x23
                    372:        /* clear non-cacheable region 1 */
                    373:        movb    $(NCR1+2),%al
                    374:        outb    %al,$0x22
                    375:        movb    $NCR_SIZE_0K,%al
                    376:        outb    %al,$0x23
                    377:        /* clear non-cacheable region 2 */
                    378:        movb    $(NCR2+2),%al
                    379:        outb    %al,$0x22
                    380:        movb    $NCR_SIZE_0K,%al
                    381:        outb    %al,$0x23
                    382:        /* clear non-cacheable region 3 */
                    383:        movb    $(NCR3+2),%al
                    384:        outb    %al,$0x22
                    385:        movb    $NCR_SIZE_0K,%al
                    386:        outb    %al,$0x23
                    387:        /* clear non-cacheable region 4 */
                    388:        movb    $(NCR4+2),%al
                    389:        outb    %al,$0x22
                    390:        movb    $NCR_SIZE_0K,%al
                    391:        outb    %al,$0x23
                    392:        /* enable caching in CR0 */
                    393:        movl    %cr0,%eax
                    394:        andl    $~(CR0_CD|CR0_NW),%eax
                    395:        movl    %eax,%cr0
                    396:        invd
                    397: #endif /* CYRIX_CACHE_WORKS */
                    398:
                    399:        jmp     2f
                    400:
                    401: try586:        /* Use the `cpuid' instruction. */
                    402:        xorl    %eax,%eax
                    403:        cpuid
                    404:        movl    %eax,RELOC(cpu_info_primary)+CPU_INFO_LEVEL
                    405:
                    406: 2:
                    407:        /*
                    408:         * Finished with old stack; load new %esp now instead of later so we
                    409:         * can trace this code without having to worry about the trace trap
                    410:         * clobbering the memory test or the zeroing of the bss+bootstrap page
                    411:         * tables.
                    412:         *
                    413:         * The boot program should check:
                    414:         *      text+data <= &stack_variable - more_space_for_stack
                    415:         *      text+data+bss+pad+space_for_page_tables <= end_of_memory
                    416:         * Oops, the gdt is in the carcass of the boot program so clearing
                    417:         * the rest of memory is still not possible.
                    418:         */
                    419:        movl    $_RELOC(tmpstk),%esp    # bootstrap stack end location
                    420:
                    421: /*
                    422:  * Virtual address space of kernel:
                    423:  *
1.30      junyoung  424:  * text | data | bss | [syms] | page dir | proc0 kstack
1.1       fvdl      425:  *                           0          1       2      3
                    426:  */
1.7       thorpej   427: #define        PROC0PDIR       ((0)              * PAGE_SIZE)
                    428: #define        PROC0STACK      ((1)              * PAGE_SIZE)
                    429: #define        SYSMAP          ((1+UPAGES)       * PAGE_SIZE)
                    430: #define        TABLESIZE       ((1+UPAGES) * PAGE_SIZE) /* + nkpde * PAGE_SIZE */
1.1       fvdl      431:
                    432:        /* Find end of kernel image. */
                    433:        movl    $RELOC(end),%edi
1.8       fvdl      434: #if (NKSYMS || defined(DDB) || defined(LKM)) && !defined(SYMTAB_SPACE)
1.1       fvdl      435:        /* Save the symbols (if loaded). */
                    436:        movl    RELOC(esym),%eax
                    437:        testl   %eax,%eax
                    438:        jz      1f
1.35      yamt      439:        subl    $KERNBASE,%eax
1.1       fvdl      440:        movl    %eax,%edi
                    441: 1:
                    442: #endif
                    443:
                    444:        /* Calculate where to start the bootstrap tables. */
                    445:        movl    %edi,%esi                       # edi = esym ? esym : end
                    446:        addl    $PGOFSET,%esi                   # page align up
                    447:        andl    $~PGOFSET,%esi
                    448:
                    449:        /*
                    450:         * Calculate the size of the kernel page table directory, and
1.29      mycroft   451:         * how many entries it will have.  Adjust nkpde to the actual
                    452:         * kernel size automatically.  Account for the bootstrap tables,
                    453:         * round up, and add an extra 4MB.
1.1       fvdl      454:         */
1.29      mycroft   455:        leal    TABLESIZE+NBPD+PDOFSET(%edi),%eax
                    456:        shrl    $PDSHIFT,%eax
1.1       fvdl      457:        movl    RELOC(nkpde),%ecx               # get nkpde
1.29      mycroft   458:        cmpl    %ecx,%eax
                    459:        jb      1f
                    460:        movl    %eax,%ecx
                    461: 1:     cmpl    $NKPTP_MIN,%ecx                 # larger than min?
1.1       fvdl      462:        jge     1f
                    463:        movl    $NKPTP_MIN,%ecx                 # set at min
                    464:        jmp     2f
                    465: 1:     cmpl    $NKPTP_MAX,%ecx                 # larger than max?
                    466:        jle     2f
                    467:        movl    $NKPTP_MAX,%ecx
1.29      mycroft   468: 2:     movl    %ecx,RELOC(nkpde)
1.1       fvdl      469:
                    470:        /* Clear memory for bootstrap tables. */
                    471:        shll    $PGSHIFT,%ecx
                    472:        addl    $TABLESIZE,%ecx
                    473:        addl    %esi,%ecx                       # end of tables
                    474:        subl    %edi,%ecx                       # size of tables
                    475:        shrl    $2,%ecx
                    476:        xorl    %eax,%eax
                    477:        cld
                    478:        rep
                    479:        stosl
                    480:
                    481: /*
                    482:  * fillkpt
                    483:  *     eax = pte (page frame | control | status)
                    484:  *     ebx = page table address
                    485:  *     ecx = number of pages to map
                    486:  */
                    487: #define        fillkpt         \
                    488: 1:     movl    %eax,(%ebx)     ; \
1.7       thorpej   489:        addl    $PAGE_SIZE,%eax ; /* increment physical address */ \
1.1       fvdl      490:        addl    $4,%ebx         ; /* next pte */ \
                    491:        loop    1b              ;
                    492:
                    493: /*
                    494:  * Build initial page tables.
                    495:  */
                    496:        /* Calculate end of text segment, rounded to a page. */
                    497:        leal    (RELOC(etext)+PGOFSET),%edx
                    498:        andl    $~PGOFSET,%edx
1.30      junyoung  499:
1.1       fvdl      500:        /* Skip over the first 1MB. */
                    501:        movl    $_RELOC(KERNTEXTOFF),%eax
                    502:        movl    %eax,%ecx
                    503:        shrl    $PGSHIFT,%ecx
                    504:        leal    (SYSMAP)(%esi,%ecx,4),%ebx
                    505:
                    506:        /* Map the kernel text read-only. */
                    507:        movl    %edx,%ecx
                    508:        subl    %eax,%ecx
                    509:        shrl    $PGSHIFT,%ecx
                    510:        orl     $(PG_V|PG_KR),%eax
                    511:        fillkpt
                    512:
                    513:        /* Map the data, BSS, and bootstrap tables read-write. */
                    514:        leal    (PG_V|PG_KW)(%edx),%eax
                    515:        movl    RELOC(nkpde),%ecx
                    516:        shll    $PGSHIFT,%ecx
                    517:        addl    $TABLESIZE,%ecx
                    518:        addl    %esi,%ecx                               # end of tables
                    519:        subl    %edx,%ecx                               # subtract end of text
                    520:        shrl    $PGSHIFT,%ecx
                    521:        fillkpt
                    522:
                    523:        /* Map ISA I/O memory. */
                    524:        movl    $(IOM_BEGIN|PG_V|PG_KW/*|PG_N*/),%eax   # having these bits set
                    525:        movl    $(IOM_SIZE>>PGSHIFT),%ecx               # for this many pte s,
                    526:        fillkpt
                    527:
                    528: /*
                    529:  * Construct a page table directory.
                    530:  */
                    531:        /* Install PDEs for temporary double map of kernel. */
                    532:        movl    RELOC(nkpde),%ecx                       # for this many pde s,
                    533:        leal    (PROC0PDIR+0*4)(%esi),%ebx              # which is where temp maps!
                    534:        leal    (SYSMAP+PG_V|PG_KW)(%esi),%eax          # pte for KPT in proc 0,
                    535:        fillkpt
                    536:
                    537:        /* Map kernel PDEs. */
                    538:        movl    RELOC(nkpde),%ecx                       # for this many pde s,
                    539:        leal    (PROC0PDIR+PDSLOT_KERN*4)(%esi),%ebx    # kernel pde offset
                    540:        leal    (SYSMAP+PG_V|PG_KW)(%esi),%eax          # pte for KPT in proc 0,
                    541:        fillkpt
                    542:
                    543:        /* Install a PDE recursively mapping page directory as a page table! */
                    544:        leal    (PROC0PDIR+PG_V|PG_KW)(%esi),%eax       # pte for ptd
                    545:        movl    %eax,(PROC0PDIR+PDSLOT_PTE*4)(%esi)     # recursive PD slot
                    546:
1.31      junyoung  547:        /* Save phys. addr of PDP, for libkvm. */
                    548:        movl    %esi,RELOC(PDPpaddr)
1.1       fvdl      549:
                    550:        /* Load base of page directory and enable mapping. */
                    551:        movl    %esi,%eax               # phys address of ptd in proc 0
                    552:        movl    %eax,%cr3               # load ptd addr into mmu
                    553:        movl    %cr0,%eax               # get control word
                    554:                                        # enable paging & NPX emulation
                    555:        orl     $(CR0_PE|CR0_PG|CR0_NE|CR0_TS|CR0_EM|CR0_MP),%eax
                    556:        movl    %eax,%cr0               # and let's page NOW!
                    557:
                    558:        pushl   $begin                  # jump to high mem
                    559:        ret
                    560:
                    561: begin:
1.35      yamt      562:        /* Now running relocated at KERNBASE.  Remove double mapping. */
1.1       fvdl      563:        movl    _C_LABEL(nkpde),%ecx            # for this many pde s,
                    564:        leal    (PROC0PDIR+0*4)(%esi),%ebx      # which is where temp maps!
1.35      yamt      565:        addl    $(KERNBASE), %ebx       # now use relocated address
1.1       fvdl      566: 1:     movl    $0,(%ebx)
                    567:        addl    $4,%ebx # next pde
                    568:        loop    1b
                    569:
                    570:        /* Relocate atdevbase. */
                    571:        movl    _C_LABEL(nkpde),%edx
                    572:        shll    $PGSHIFT,%edx
1.35      yamt      573:        addl    $(TABLESIZE+KERNBASE),%edx
1.1       fvdl      574:        addl    %esi,%edx
                    575:        movl    %edx,_C_LABEL(atdevbase)
                    576:
                    577:        /* Set up bootstrap stack. */
1.35      yamt      578:        leal    (PROC0STACK+KERNBASE)(%esi),%eax
1.40      yamt      579:        movl    %eax,_C_LABEL(proc0uarea)
                    580:        leal    (KSTACK_SIZE-FRAMESIZE)(%eax),%esp
                    581:        movl    %esi,(KSTACK_SIZE+PCB_CR3)(%eax)        # pcb->pcb_cr3
1.1       fvdl      582:        xorl    %ebp,%ebp               # mark end of frames
                    583:
1.37      jmmv      584: #if defined(MULTIBOOT)
                    585:        /* It is now safe to parse the Multiboot information structure
                    586:         * we saved before from C code.  Note that we cannot delay its
                    587:         * parsing any more because initgdt (called below) needs to make
                    588:         * use of this information. */
                    589:        call    _C_LABEL(multiboot_post_reloc)
                    590: #endif
                    591:
1.1       fvdl      592:        subl    $NGDT*8, %esp           # space for temporary gdt
                    593:        pushl   %esp
                    594:        call    _C_LABEL(initgdt)
                    595:        addl    $4,%esp
1.30      junyoung  596:
1.1       fvdl      597:        movl    _C_LABEL(nkpde),%eax
                    598:        shll    $PGSHIFT,%eax
                    599:        addl    $TABLESIZE,%eax
                    600:        addl    %esi,%eax               # skip past stack and page tables
                    601:
                    602:        pushl   %eax
                    603:        call    _C_LABEL(init386)       # wire 386 chip for unix operation
                    604:        addl    $4+NGDT*8,%esp          # pop temporary gdt
                    605:
                    606: #ifdef SAFARI_FIFO_HACK
                    607:        movb    $5,%al
                    608:        movw    $0x37b,%dx
                    609:        outb    %al,%dx
                    610:        movw    $0x37f,%dx
                    611:        inb     %dx,%al
                    612:        movb    %al,%cl
                    613:
                    614:        orb     $1,%cl
                    615:
                    616:        movb    $5,%al
                    617:        movw    $0x37b,%dx
                    618:        outb    %al,%dx
                    619:        movw    $0x37f,%dx
                    620:        movb    %cl,%al
                    621:        outb    %al,%dx
                    622: #endif /* SAFARI_FIFO_HACK */
                    623:
                    624:        call    _C_LABEL(main)
                    625:
                    626: /*
1.45.2.1  yamt      627:  * void lwp_trampoline(void);
1.1       fvdl      628:  * This is a trampoline function pushed onto the stack of a newly created
                    629:  * process in order to do some additional setup.  The trampoline is entered by
                    630:  * cpu_switch()ing to the process, so we abuse the callee-saved registers used
                    631:  * by cpu_switch() to store the information about the stub to call.
                    632:  * NOTE: This function does not have a normal calling sequence!
                    633:  */
1.45.2.1  yamt      634: /* LINTSTUB: Func: void lwp_trampoline(void) */
                    635: NENTRY(lwp_trampoline)
                    636:        pushl   %ebp
                    637:        xorl    %ebp,%ebp
                    638:        pushl   %eax
                    639:        call    _C_LABEL(lwp_startup)
                    640:        addl    $8,%esp
1.1       fvdl      641:        pushl   %ebx
                    642:        call    *%esi
                    643:        addl    $4,%esp
1.24      yamt      644:        DO_DEFERRED_SWITCH(%eax)
1.1       fvdl      645:        INTRFASTEXIT
                    646:        /* NOTREACHED */
                    647:
                    648: /*****************************************************************************/
1.16      christos  649: #ifdef COMPAT_16
1.1       fvdl      650: /*
                    651:  * Signal trampoline; copied to top of user stack.
                    652:  */
                    653: /* LINTSTUB: Var: char sigcode[1], esigcode[1]; */
                    654: NENTRY(sigcode)
                    655:        /*
                    656:         * Handler has returned here as if we called it.  The sigcontext
                    657:         * is on the stack after the 3 args "we" pushed.
                    658:         */
                    659:        leal    12(%esp),%eax           # get pointer to sigcontext
                    660:        movl    %eax,4(%esp)            # put it in the argument slot
                    661:                                        # fake return address already there
1.17      christos  662:        movl    $SYS_compat_16___sigreturn14,%eax
1.1       fvdl      663:        int     $0x80                   # enter kernel with args on stack
                    664:        movl    $SYS_exit,%eax
                    665:        int     $0x80                   # exit if sigreturn fails
                    666:        .globl  _C_LABEL(esigcode)
                    667: _C_LABEL(esigcode):
1.16      christos  668: #endif
1.1       fvdl      669:
                    670: /*****************************************************************************/
                    671:
                    672: /*
                    673:  * The following is i386-specific nonsense.
                    674:  */
                    675:
                    676: /*
                    677:  * void lgdt(struct region_descriptor *rdp);
                    678:  * Load a new GDT pointer (and do any necessary cleanup).
                    679:  * XXX It's somewhat questionable whether reloading all the segment registers
                    680:  * is necessary, since the actual descriptor data is not changed except by
                    681:  * process creation and exit, both of which clean up via task switches.  OTOH,
                    682:  * this only happens at run time when the GDT is resized.
                    683:  */
                    684: /* LINTSTUB: Func: void lgdt(struct region_descriptor *rdp) */
                    685: NENTRY(lgdt)
                    686:        /* Reload the descriptor table. */
                    687:        movl    4(%esp),%eax
                    688:        lgdt    (%eax)
                    689:        /* Flush the prefetch queue. */
                    690:        jmp     1f
                    691:        nop
                    692: 1:     /* Reload "stale" selectors. */
                    693:        movl    $GSEL(GDATA_SEL, SEL_KPL),%eax
                    694:        movw    %ax,%ds
                    695:        movw    %ax,%es
                    696:        movw    %ax,%gs
                    697:        movw    %ax,%ss
                    698:        movl    $GSEL(GCPU_SEL, SEL_KPL),%eax
                    699:        movw    %ax,%fs
                    700:        /* Reload code selector by doing intersegment return. */
                    701:        popl    %eax
                    702:        pushl   $GSEL(GCODE_SEL, SEL_KPL)
                    703:        pushl   %eax
                    704:        lret
                    705:
1.45      ad        706: NENTRY(x86_flush)
                    707:        /* Reload code selector by doing intersegment return. */
                    708:        popl    %eax
                    709:        pushl   $GSEL(GCODE_SEL, SEL_KPL)
                    710:        pushl   %eax
                    711:        lret
                    712:
1.1       fvdl      713: /*****************************************************************************/
                    714:
                    715: /*
                    716:  * These functions are primarily used by DDB.
                    717:  */
                    718:
                    719: /* LINTSTUB: Func: int setjmp (label_t *l) */
                    720: ENTRY(setjmp)
                    721:        movl    4(%esp),%eax
                    722:        movl    %ebx,(%eax)             # save ebx
                    723:        movl    %esp,4(%eax)            # save esp
                    724:        movl    %ebp,8(%eax)            # save ebp
                    725:        movl    %esi,12(%eax)           # save esi
                    726:        movl    %edi,16(%eax)           # save edi
                    727:        movl    (%esp),%edx             # get rta
                    728:        movl    %edx,20(%eax)           # save eip
                    729:        xorl    %eax,%eax               # return (0);
                    730:        ret
                    731:
                    732: /* LINTSTUB: Func: void longjmp (label_t *l) */
                    733: ENTRY(longjmp)
                    734:        movl    4(%esp),%eax
                    735:        movl    (%eax),%ebx             # restore ebx
                    736:        movl    4(%eax),%esp            # restore esp
                    737:        movl    8(%eax),%ebp            # restore ebp
                    738:        movl    12(%eax),%esi           # restore esi
                    739:        movl    16(%eax),%edi           # restore edi
                    740:        movl    20(%eax),%edx           # get rta
                    741:        movl    %edx,(%esp)             # put in return frame
                    742:        xorl    %eax,%eax               # return (1);
                    743:        incl    %eax
                    744:        ret
                    745:
                    746: /*****************************************************************************/
                    747:
                    748:        .globl  _C_LABEL(uvmexp),_C_LABEL(panic)
                    749:
                    750: #ifdef DIAGNOSTIC
                    751: NENTRY(switch_error)
                    752:        pushl   $1f
                    753:        call    _C_LABEL(panic)
                    754:        /* NOTREACHED */
                    755: 1:     .asciz  "cpu_switch"
                    756: #endif /* DIAGNOSTIC */
                    757:
                    758: /*
1.45.2.1  yamt      759:  * struct lwp *cpu_switchto(struct lwp *oldlwp, struct newlwp)
                    760:  *
1.45.2.2  yamt      761:  *     1. if (oldlwp != NULL), save its context.
1.45.2.1  yamt      762:  *     2. then, restore context of newlwp.
1.30      junyoung  763:  *
1.1       fvdl      764:  * Note that the stack frame layout is known to "struct switchframe"
1.45.2.1  yamt      765:  * in <machine/frame.h> and to the code in cpu_lwp_fork() which initializes
1.5       thorpej   766:  * it for a new lwp.
1.1       fvdl      767:  */
1.45.2.1  yamt      768: ENTRY(cpu_switchto)
1.1       fvdl      769:        pushl   %ebx
                    770:        pushl   %esi
                    771:        pushl   %edi
                    772:
1.45.2.1  yamt      773:        movl    16(%esp),%esi           # oldlwp
                    774:        movl    20(%esp),%edi           # newlwp
1.30      junyoung  775:
1.45.2.1  yamt      776:        testl   %esi,%esi
                    777:        jz      switch_skipsave
1.1       fvdl      778:
                    779:        /*
1.45.2.1  yamt      780:         * Save old context.
1.1       fvdl      781:         */
                    782:
1.45.2.1  yamt      783:        movl    L_ADDR(%esi),%eax
                    784:        movl    %esp,PCB_ESP(%eax)
                    785:        movl    %ebp,PCB_EBP(%eax)
1.1       fvdl      786:
1.45.2.1  yamt      787: switch_skipsave:
1.1       fvdl      788:
1.30      junyoung  789:        /*
1.45.2.1  yamt      790:         * Switch to newlwp's stack.
1.1       fvdl      791:         */
                    792:
1.45.2.1  yamt      793:        movl    L_ADDR(%edi),%ebx
                    794:        movl    PCB_EBP(%ebx),%ebp
                    795:        movl    PCB_ESP(%ebx),%esp
1.1       fvdl      796:
                    797:        /*
1.45.2.1  yamt      798:         * Restore the rest of newlwp's context.
1.1       fvdl      799:         *
                    800:         * Registers:
1.45.2.1  yamt      801:         *   %ebx - new pcb
1.5       thorpej   802:         *   %edi - new lwp
1.1       fvdl      803:         */
                    804:
                    805: #if 0
                    806:        /* Don't bother with the rest if switching to a system process. */
1.45.2.3! yamt      807:        testl   $LK_SYSTEM,L_FLAG(%edi);
1.1       fvdl      808:        jnz     switch_restored
                    809: #endif
                    810:
1.26      yamt      811:        /* Switch TSS. Reset "task busy" flag before loading. */
                    812:        movl    %cr3,%eax
1.45.2.1  yamt      813:        movl    %eax,PCB_CR3(%ebx) /* for TSS gates */
                    814:
1.1       fvdl      815: #ifdef MULTIPROCESSOR
                    816:        movl    CPUVAR(GDT),%eax
1.30      junyoung  817: #else
1.1       fvdl      818:        /* Load TSS info. */
                    819:        movl    _C_LABEL(gdt),%eax
                    820: #endif
1.5       thorpej   821:        movl    L_MD_TSS_SEL(%edi),%edx
1.1       fvdl      822:
                    823:        andl    $~0x0200,4(%eax,%edx, 1)
                    824:        ltr     %dx
                    825:
                    826: #if 0
                    827: switch_restored:
                    828: #endif
1.45.2.1  yamt      829:
                    830:        movl    $0,CPUVAR(RESCHED)
                    831:
1.1       fvdl      832:        /* Restore cr0 (including FPU state). */
1.45.2.1  yamt      833:        cli
                    834:        movl    PCB_CR0(%ebx),%ecx
1.1       fvdl      835: #ifdef MULTIPROCESSOR
1.30      junyoung  836:        /*
1.22      wiz       837:         * If our floating point registers are on a different CPU,
1.45.2.1  yamt      838:         * set CR0_TS so we'll trap rather than reuse bogus state.
1.1       fvdl      839:         */
1.45.2.1  yamt      840:        movl    PCB_FPCPU(%ebx),%eax
                    841:        cmpl    CPUVAR(SELF),%eax
1.1       fvdl      842:        jz      1f
                    843:        orl     $CR0_TS,%ecx
1.30      junyoung  844: 1:
                    845: #endif
1.1       fvdl      846:        movl    %ecx,%cr0
                    847:
                    848:        /* Interrupts are okay again. */
                    849:        sti
                    850:
1.45.2.1  yamt      851:        /*
                    852:         *  Check for restartable atomic sequences (RAS)
                    853:         */
1.9       fvdl      854:
1.45.2.1  yamt      855:        movl    L_PROC(%edi),%ebx
                    856:        cmpl    $0,P_RASLIST(%ebx)
                    857:        jne     check_ras
1.30      junyoung  858:
1.45.2.1  yamt      859: switch_return:
                    860:        movl    %esi,%eax       # return 'oldlwp'
1.1       fvdl      861:        popl    %edi
                    862:        popl    %esi
                    863:        popl    %ebx
                    864:        ret
1.20      dsl       865:
1.45.2.1  yamt      866: check_ras:
1.20      dsl       867:        movl    L_MD_REGS(%edi),%ebx
                    868:        movl    TF_EIP(%ebx),%eax
                    869:        pushl   %eax
                    870:        pushl   %esi
                    871:        call    _C_LABEL(ras_lookup)
                    872:        addl    $8,%esp
                    873:        cmpl    $-1,%eax
1.45.2.1  yamt      874:        je      switch_return
1.20      dsl       875:        movl    %eax,TF_EIP(%ebx)
1.45.2.1  yamt      876:        jmp     switch_return
1.1       fvdl      877:
                    878: /*
                    879:  * void savectx(struct pcb *pcb);
                    880:  * Update pcb, saving current processor state.
                    881:  */
                    882: /* LINTSTUB: Func: void savectx(struct pcb *pcb) */
                    883: ENTRY(savectx)
1.45.2.3! yamt      884:        movl    4(%esp),%edx            # edx = pcb
1.30      junyoung  885:
1.1       fvdl      886:        /* Save stack pointers. */
                    887:        movl    %esp,PCB_ESP(%edx)
                    888:        movl    %ebp,PCB_EBP(%edx)
                    889:
                    890:        ret
                    891:
                    892: /*
                    893:  * Old call gate entry for syscall
                    894:  */
                    895: /* LINTSTUB: Var: char Xosyscall[1]; */
                    896: IDTVEC(osyscall)
                    897:        /* Set eflags in trap frame. */
                    898:        pushfl
                    899:        popl    8(%esp)
                    900:        pushl   $7              # size of instruction for restart
                    901:        jmp     syscall1
                    902:
                    903: /*
                    904:  * Trap gate entry for syscall
                    905:  */
                    906: /* LINTSTUB: Var: char Xsyscall[1]; */
                    907: IDTVEC(syscall)
                    908:        pushl   $2              # size of instruction for restart
                    909: syscall1:
                    910:        pushl   $T_ASTFLT       # trap # for doing ASTs
                    911:        INTRENTRY
                    912:
                    913: #ifdef DIAGNOSTIC
1.24      yamt      914:        cmpl    $0, CPUVAR(WANT_PMAPLOAD)
                    915:        jz      1f
                    916:        pushl   $6f
                    917:        call    _C_LABEL(printf)
                    918:        addl    $4, %esp
                    919: 1:
1.1       fvdl      920:        movl    CPUVAR(ILEVEL),%ebx
                    921:        testl   %ebx,%ebx
                    922:        jz      1f
                    923:        pushl   $5f
                    924:        call    _C_LABEL(printf)
                    925:        addl    $4,%esp
                    926: #ifdef DDB
                    927:        int     $3
                    928: #endif
1.30      junyoung  929: 1:
1.1       fvdl      930: #endif /* DIAGNOSTIC */
1.5       thorpej   931:        movl    CPUVAR(CURLWP),%edx
                    932:        movl    %esp,L_MD_REGS(%edx)    # save pointer to frame
                    933:        movl    L_PROC(%edx),%edx
1.15      fvdl      934:        pushl   %esp
1.1       fvdl      935:        call    *P_MD_SYSCALL(%edx)     # get pointer to syscall() function
1.15      fvdl      936:        addl    $4,%esp
1.27      yamt      937: .Lsyscall_checkast:
1.24      yamt      938:        /* Check for ASTs on exit to user mode. */
1.1       fvdl      939:        cli
1.5       thorpej   940:        CHECK_ASTPENDING(%eax)
1.1       fvdl      941:        je      1f
                    942:        /* Always returning to user mode here. */
1.5       thorpej   943:        CLEAR_ASTPENDING(%eax)
1.1       fvdl      944:        sti
                    945:        /* Pushed T_ASTFLT into tf_trapno on entry. */
1.15      fvdl      946:        pushl   %esp
1.1       fvdl      947:        call    _C_LABEL(trap)
1.15      fvdl      948:        addl    $4,%esp
1.27      yamt      949:        jmp     .Lsyscall_checkast      /* re-check ASTs */
1.24      yamt      950: 1:     CHECK_DEFERRED_SWITCH(%eax)
                    951:        jnz     9f
1.1       fvdl      952: #ifndef DIAGNOSTIC
1.24      yamt      953:        INTRFASTEXIT
1.1       fvdl      954: #else /* DIAGNOSTIC */
1.24      yamt      955:        cmpl    $IPL_NONE,CPUVAR(ILEVEL)
1.1       fvdl      956:        jne     3f
                    957:        INTRFASTEXIT
                    958: 3:     sti
                    959:        pushl   $4f
                    960:        call    _C_LABEL(printf)
                    961:        addl    $4,%esp
                    962: #ifdef DDB
                    963:        int     $3
                    964: #endif /* DDB */
                    965:        movl    $IPL_NONE,CPUVAR(ILEVEL)
                    966:        jmp     2b
                    967: 4:     .asciz  "WARNING: SPL NOT LOWERED ON SYSCALL EXIT\n"
1.30      junyoung  968: 5:     .asciz  "WARNING: SPL NOT ZERO ON SYSCALL ENTRY\n"
                    969: 6:     .asciz  "WARNING: WANT PMAPLOAD ON SYSCALL ENTRY\n"
1.1       fvdl      970: #endif /* DIAGNOSTIC */
1.24      yamt      971: 9:     sti
                    972:        call    _C_LABEL(pmap_load)
1.27      yamt      973:        jmp     .Lsyscall_checkast      /* re-check ASTs */
1.1       fvdl      974:
                    975: #if NNPX > 0
                    976: /*
                    977:  * Special interrupt handlers.  Someday intr0-intr15 will be used to count
                    978:  * interrupts.  We'll still need a special exception 16 handler.  The busy
                    979:  * latch stuff in probintr() can be moved to npxprobe().
                    980:  */
                    981:
                    982: /* LINTSTUB: Func: void probeintr(void) */
                    983: NENTRY(probeintr)
                    984:        ss
                    985:        incl    _C_LABEL(npx_intrs_while_probing)
                    986:        pushl   %eax
                    987:        movb    $0x20,%al       # EOI (asm in strings loses cpp features)
                    988:        outb    %al,$0xa0       # IO_ICU2
                    989:        outb    %al,$0x20       # IO_ICU1
                    990:        movb    $0,%al
                    991:        outb    %al,$0xf0       # clear BUSY# latch
                    992:        popl    %eax
                    993:        iret
                    994:
                    995: /* LINTSTUB: Func: void probetrap(void) */
                    996: NENTRY(probetrap)
                    997:        ss
                    998:        incl    _C_LABEL(npx_traps_while_probing)
                    999:        fnclex
                   1000:        iret
                   1001:
                   1002: /* LINTSTUB: Func: int npx586bug1(int a, int b) */
                   1003: NENTRY(npx586bug1)
                   1004:        fildl   4(%esp)         # x
                   1005:        fildl   8(%esp)         # y
                   1006:        fld     %st(1)
                   1007:        fdiv    %st(1),%st      # x/y
                   1008:        fmulp   %st,%st(1)      # (x/y)*y
                   1009:        fsubrp  %st,%st(1)      # x-(x/y)*y
                   1010:        pushl   $0
                   1011:        fistpl  (%esp)
                   1012:        popl    %eax
                   1013:        ret
                   1014: #endif /* NNPX > 0 */

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