[BACK]Return to locore.S CVS log [TXT][DIR] Up to [cvs.NetBSD.org] / src / sys / arch / i386 / i386

Annotation of src/sys/arch/i386/i386/locore.S, Revision 1.69

1.69    ! martin      1: /*     $NetBSD: locore.S,v 1.68 2008/04/27 22:40:09 ad Exp $   */
1.53      yamt        2:
                      3: /*
                      4:  * Copyright-o-rama!
                      5:  */
                      6:
                      7: /*
1.62      bouyer      8:  * Copyright (c) 2006 Manuel Bouyer.
                      9:  *
                     10:  * Redistribution and use in source and binary forms, with or without
                     11:  * modification, are permitted provided that the following conditions
                     12:  * are met:
                     13:  * 1. Redistributions of source code must retain the above copyright
                     14:  *    notice, this list of conditions and the following disclaimer.
                     15:  * 2. Redistributions in binary form must reproduce the above copyright
                     16:  *    notice, this list of conditions and the following disclaimer in the
                     17:  *    documentation and/or other materials provided with the distribution.
                     18:  * 3. All advertising materials mentioning features or use of this software
                     19:  *    must display the following acknowledgement:
                     20:  *     This product includes software developed by Manuel Bouyer.
                     21:  * 4. The name of the author may not be used to endorse or promote products
                     22:  *    derived from this software without specific prior written permission.
                     23:  *
                     24:  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
                     25:  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
                     26:  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
                     27:  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
                     28:  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
                     29:  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
                     30:  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
                     31:  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
                     32:  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
                     33:  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
                     34:  *
                     35:  */
                     36:
                     37: /*
1.53      yamt       38:  * Copyright (c) 2001 Wasabi Systems, Inc.
                     39:  * All rights reserved.
                     40:  *
                     41:  * Written by Frank van der Linden for Wasabi Systems, Inc.
                     42:  *
                     43:  * Redistribution and use in source and binary forms, with or without
                     44:  * modification, are permitted provided that the following conditions
                     45:  * are met:
                     46:  * 1. Redistributions of source code must retain the above copyright
                     47:  *    notice, this list of conditions and the following disclaimer.
                     48:  * 2. Redistributions in binary form must reproduce the above copyright
                     49:  *    notice, this list of conditions and the following disclaimer in the
                     50:  *    documentation and/or other materials provided with the distribution.
                     51:  * 3. All advertising materials mentioning features or use of this software
                     52:  *    must display the following acknowledgement:
                     53:  *      This product includes software developed for the NetBSD Project by
                     54:  *      Wasabi Systems, Inc.
                     55:  * 4. The name of Wasabi Systems, Inc. may not be used to endorse
                     56:  *    or promote products derived from this software without specific prior
                     57:  *    written permission.
                     58:  *
                     59:  * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND
                     60:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
                     61:  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
                     62:  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL WASABI SYSTEMS, INC
                     63:  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
                     64:  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
                     65:  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
                     66:  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
                     67:  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
                     68:  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
                     69:  * POSSIBILITY OF SUCH DAMAGE.
                     70:  */
                     71:
1.1       fvdl       72:
                     73: /*-
1.48      yamt       74:  * Copyright (c) 1998, 2000, 2004, 2006, 2007 The NetBSD Foundation, Inc.
1.1       fvdl       75:  * All rights reserved.
                     76:  *
                     77:  * This code is derived from software contributed to The NetBSD Foundation
                     78:  * by Charles M. Hannum.
                     79:  *
                     80:  * Redistribution and use in source and binary forms, with or without
                     81:  * modification, are permitted provided that the following conditions
                     82:  * are met:
                     83:  * 1. Redistributions of source code must retain the above copyright
                     84:  *    notice, this list of conditions and the following disclaimer.
                     85:  * 2. Redistributions in binary form must reproduce the above copyright
                     86:  *    notice, this list of conditions and the following disclaimer in the
                     87:  *    documentation and/or other materials provided with the distribution.
                     88:  *
                     89:  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
                     90:  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
                     91:  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
                     92:  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
                     93:  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
                     94:  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
                     95:  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
                     96:  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
                     97:  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
                     98:  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
                     99:  * POSSIBILITY OF SUCH DAMAGE.
                    100:  */
                    101:
                    102: /*-
                    103:  * Copyright (c) 1990 The Regents of the University of California.
                    104:  * All rights reserved.
                    105:  *
                    106:  * This code is derived from software contributed to Berkeley by
                    107:  * William Jolitz.
                    108:  *
                    109:  * Redistribution and use in source and binary forms, with or without
                    110:  * modification, are permitted provided that the following conditions
                    111:  * are met:
                    112:  * 1. Redistributions of source code must retain the above copyright
                    113:  *    notice, this list of conditions and the following disclaimer.
                    114:  * 2. Redistributions in binary form must reproduce the above copyright
                    115:  *    notice, this list of conditions and the following disclaimer in the
                    116:  *    documentation and/or other materials provided with the distribution.
1.12      agc       117:  * 3. Neither the name of the University nor the names of its contributors
1.1       fvdl      118:  *    may be used to endorse or promote products derived from this software
                    119:  *    without specific prior written permission.
                    120:  *
                    121:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
                    122:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                    123:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                    124:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
                    125:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                    126:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                    127:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                    128:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                    129:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                    130:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                    131:  * SUCH DAMAGE.
                    132:  *
                    133:  *     @(#)locore.s    7.3 (Berkeley) 5/13/91
                    134:  */
                    135:
1.59      lukem     136: #include <machine/asm.h>
1.69    ! martin    137: __KERNEL_RCSID(0, "$NetBSD: locore.S,v 1.68 2008/04/27 22:40:09 ad Exp $");
1.59      lukem     138:
1.18      christos  139: #include "opt_compat_oldboot.h"
1.1       fvdl      140: #include "opt_ddb.h"
                    141: #include "opt_realmem.h"
1.18      christos  142: #include "opt_vm86.h"
1.62      bouyer    143: #include "opt_xen.h"
1.1       fvdl      144:
                    145: #include "npx.h"
                    146: #include "assym.h"
                    147: #include "lapic.h"
                    148: #include "ioapic.h"
1.8       fvdl      149: #include "ksyms.h"
1.1       fvdl      150:
                    151: #include <sys/errno.h>
                    152: #include <sys/syscall.h>
                    153:
                    154: #include <machine/cputypes.h>
                    155: #include <machine/segments.h>
                    156: #include <machine/specialreg.h>
                    157: #include <machine/trap.h>
                    158: #include <machine/i82489reg.h>
1.48      yamt      159: #include <machine/frameasm.h>
                    160: #include <machine/i82489reg.h>
1.62      bouyer    161: #ifndef XEN
                    162: #include <machine/multiboot.h>
                    163: #endif
1.1       fvdl      164:
                    165: /* XXX temporary kluge; these should not be here */
                    166: /* Get definitions for IOM_BEGIN, IOM_END, and IOM_SIZE */
                    167: #include <dev/isa/isareg.h>
                    168:
1.62      bouyer    169: #ifdef XEN
                    170: /*
                    171:  * Xen guest identifier and loader selection
                    172:  */
                    173: .section __xen_guest
                    174: #ifdef XEN3
                    175:        .ascii  "GUEST_OS=netbsd,GUEST_VER=3.0,XEN_VER=xen-3.0"
                    176: #if defined(DOM0OPS) || !defined(XEN_COMPAT_030001)
                    177:        .ascii  ",VIRT_BASE=0xc0000000" /* KERNBASE */
                    178:        .ascii  ",ELF_PADDR_OFFSET=0xc0000000" /* KERNBASE */
                    179: #else
                    180:        .ascii  ",VIRT_BASE=0xc0100000" /* KERNTEXTOFF */
                    181:        .ascii  ",ELF_PADDR_OFFSET=0xc0100000" /* KERNTEXTOFF */
                    182: #endif
                    183:        .ascii  ",VIRT_ENTRY=0xc0100000" /* KERNTEXTOFF */
                    184: #if !defined(XEN_COMPAT_030001)
                    185:        .ascii  ",HYPERCALL_PAGE=0x00000101"
                    186:                /* (???+HYPERCALL_PAGE_OFFSET)/PAGE_SIZE) */
                    187: #endif
1.66      bouyer    188: #ifdef PAE
                    189:        .ascii  ",PAE=yes[extended-cr3]"
                    190: #endif
1.62      bouyer    191: #else /* !XEN3 */
                    192:        .ascii  "GUEST_OS=netbsd,GUEST_VER=2.0,XEN_VER=2.0"
                    193: #endif /* XEN3 */
                    194:        .ascii  ",LOADER=generic"
                    195: #if (NKSYMS || defined(DDB) || defined(LKM)) && !defined(SYMTAB_SPACE)
                    196:        .ascii  ",BSD_SYMTAB=yes"
                    197: #endif
                    198:        .byte   0
                    199: #endif
                    200:
1.1       fvdl      201: /*
                    202:  * Initialization
                    203:  */
                    204:        .data
                    205:
                    206:        .globl  _C_LABEL(cpu)
1.38      jmmv      207:        .globl  _C_LABEL(esym)
                    208:        .globl  _C_LABEL(atdevbase)
1.40      yamt      209:        .globl  _C_LABEL(proc0uarea),_C_LABEL(PDPpaddr)
1.1       fvdl      210:        .globl  _C_LABEL(gdt)
                    211:        .globl  _C_LABEL(idt)
1.30      junyoung  212:        .globl  _C_LABEL(lapic_tpr)
                    213:
1.1       fvdl      214: #if NLAPIC > 0
                    215: #ifdef __ELF__
1.7       thorpej   216:        .align  PAGE_SIZE
1.1       fvdl      217: #else
                    218:        .align  12
                    219: #endif
                    220:        .globl _C_LABEL(local_apic), _C_LABEL(lapic_id)
                    221: _C_LABEL(local_apic):
                    222:        .space  LAPIC_ID
1.30      junyoung  223: _C_LABEL(lapic_id):
1.1       fvdl      224:        .long   0x00000000
                    225:        .space  LAPIC_TPRI-(LAPIC_ID+4)
1.30      junyoung  226: _C_LABEL(lapic_tpr):
1.1       fvdl      227:        .space  LAPIC_PPRI-LAPIC_TPRI
1.30      junyoung  228: _C_LABEL(lapic_ppr):
1.1       fvdl      229:        .space  LAPIC_ISR-LAPIC_PPRI
                    230: _C_LABEL(lapic_isr):
1.7       thorpej   231:        .space  PAGE_SIZE-LAPIC_ISR
1.1       fvdl      232: #else
1.30      junyoung  233: _C_LABEL(lapic_tpr):
1.1       fvdl      234:        .long 0
                    235: #endif
1.30      junyoung  236:
1.48      yamt      237: _C_LABEL(cpu):         .long   0       # are we 80486, Pentium, or..
1.1       fvdl      238: _C_LABEL(atdevbase):   .long   0       # location of start of iomem in virtual
1.40      yamt      239: _C_LABEL(proc0uarea):  .long   0
1.31      junyoung  240: _C_LABEL(PDPpaddr):    .long   0       # paddr of PDP, for libkvm
1.53      yamt      241: _C_LABEL(tablesize):   .long   0
1.30      junyoung  242:
1.63      bouyer    243:        .space 512
1.1       fvdl      244: tmpstk:
                    245:
1.62      bouyer    246: #ifndef XEN
1.35      yamt      247: #define        _RELOC(x)       ((x) - KERNBASE)
1.62      bouyer    248: #else
                    249: #define        _RELOC(x)       ((x))
                    250: #endif /* XEN */
1.1       fvdl      251: #define        RELOC(x)        _RELOC(_C_LABEL(x))
                    252:
                    253:        .text
                    254:        .globl  _C_LABEL(kernel_text)
                    255:        .set    _C_LABEL(kernel_text),KERNTEXTOFF
                    256:
                    257:        .globl  start
1.62      bouyer    258: #ifndef XEN
1.1       fvdl      259: start: movw    $0x1234,0x472                   # warm boot
                    260:
1.37      jmmv      261: #if defined(MULTIBOOT)
                    262:        jmp     1f
                    263:
                    264:        .align  4
                    265:        .globl  Multiboot_Header
                    266: _C_LABEL(Multiboot_Header):
1.44      jmmv      267: #define MULTIBOOT_HEADER_FLAGS (MULTIBOOT_HEADER_WANT_MEMORY)
1.37      jmmv      268:        .long   MULTIBOOT_HEADER_MAGIC
                    269:        .long   MULTIBOOT_HEADER_FLAGS
                    270:        .long   -(MULTIBOOT_HEADER_MAGIC + MULTIBOOT_HEADER_FLAGS)
                    271:
                    272: 1:
                    273:        /* Check if we are being executed by a Multiboot-compliant boot
                    274:         * loader. */
                    275:        cmpl    $MULTIBOOT_INFO_MAGIC,%eax
                    276:        jne     1f
                    277:
1.43      mrg       278:        /*
                    279:         * Indeed, a multiboot-compliant boot loader executed us.  We copy
1.37      jmmv      280:         * the received Multiboot information structure into kernel's data
                    281:         * space to process it later -- after we are relocated.  It will
1.43      mrg       282:         * be safer to run complex C code than doing it at this point.
                    283:         */
1.37      jmmv      284:        pushl   %ebx            # Address of Multiboot information
                    285:        call    _C_LABEL(multiboot_pre_reloc)
                    286:        addl    $4,%esp
1.38      jmmv      287:        jmp     2f
1.37      jmmv      288: #endif
                    289:
                    290: 1:
1.1       fvdl      291:        /*
1.38      jmmv      292:         * At this point, we know that a NetBSD-specific boot loader
                    293:         * booted this kernel.  The stack carries the following parameters:
1.41      jmmv      294:         * (boothowto, [bootdev], bootinfo, esym, biosextmem, biosbasemem),
1.38      jmmv      295:         * 4 bytes each.
1.1       fvdl      296:         */
1.38      jmmv      297:        addl    $4,%esp         # Discard return address to boot loader
                    298:        call    _C_LABEL(native_loader)
                    299:        addl    $24,%esp
1.1       fvdl      300:
                    301: 2:
                    302:        /* First, reset the PSL. */
                    303:        pushl   $PSL_MBO
                    304:        popfl
                    305:
                    306:        /* Clear segment registers; always null in proc0. */
                    307:        xorl    %eax,%eax
                    308:        movw    %ax,%fs
                    309:        movw    %ax,%gs
                    310:        decl    %eax
                    311:        movl    %eax,RELOC(cpu_info_primary)+CPU_INFO_LEVEL
                    312:
                    313:        /* Find out our CPU type. */
                    314:
                    315: try386:        /* Try to toggle alignment check flag; does not exist on 386. */
                    316:        pushfl
                    317:        popl    %eax
                    318:        movl    %eax,%ecx
                    319:        orl     $PSL_AC,%eax
                    320:        pushl   %eax
                    321:        popfl
                    322:        pushfl
                    323:        popl    %eax
                    324:        xorl    %ecx,%eax
                    325:        andl    $PSL_AC,%eax
                    326:        pushl   %ecx
                    327:        popfl
                    328:
                    329:        testl   %eax,%eax
                    330:        jnz     try486
                    331:
                    332:        /*
                    333:         * Try the test of a NexGen CPU -- ZF will not change on a DIV
                    334:         * instruction on a NexGen, it will on an i386.  Documented in
                    335:         * Nx586 Processor Recognition Application Note, NexGen, Inc.
                    336:         */
                    337:        movl    $0x5555,%eax
                    338:        xorl    %edx,%edx
                    339:        movl    $2,%ecx
                    340:        divl    %ecx
                    341:        jnz     is386
                    342:
                    343: isnx586:
                    344:        /*
                    345:         * Don't try cpuid, as Nx586s reportedly don't support the
                    346:         * PSL_ID bit.
                    347:         */
                    348:        movl    $CPU_NX586,RELOC(cpu)
                    349:        jmp     2f
                    350:
                    351: is386:
                    352:        movl    $CPU_386,RELOC(cpu)
                    353:        jmp     2f
                    354:
                    355: try486:        /* Try to toggle identification flag; does not exist on early 486s. */
                    356:        pushfl
                    357:        popl    %eax
                    358:        movl    %eax,%ecx
                    359:        xorl    $PSL_ID,%eax
                    360:        pushl   %eax
                    361:        popfl
                    362:        pushfl
                    363:        popl    %eax
                    364:        xorl    %ecx,%eax
                    365:        andl    $PSL_ID,%eax
                    366:        pushl   %ecx
                    367:        popfl
                    368:
                    369:        testl   %eax,%eax
                    370:        jnz     try586
                    371: is486: movl    $CPU_486,RELOC(cpu)
                    372:        /*
                    373:         * Check Cyrix CPU
                    374:         * Cyrix CPUs do not change the undefined flags following
                    375:         * execution of the divide instruction which divides 5 by 2.
                    376:         *
                    377:         * Note: CPUID is enabled on M2, so it passes another way.
                    378:         */
                    379:        pushfl
                    380:        movl    $0x5555, %eax
                    381:        xorl    %edx, %edx
                    382:        movl    $2, %ecx
                    383:        clc
                    384:        divl    %ecx
                    385:        jnc     trycyrix486
                    386:        popfl
                    387:        jmp 2f
                    388: trycyrix486:
                    389:        movl    $CPU_6x86,RELOC(cpu)    # set CPU type
                    390:        /*
                    391:         * Check for Cyrix 486 CPU by seeing if the flags change during a
                    392:         * divide. This is documented in the Cx486SLC/e SMM Programmer's
                    393:         * Guide.
                    394:         */
                    395:        xorl    %edx,%edx
                    396:        cmpl    %edx,%edx               # set flags to known state
                    397:        pushfl
                    398:        popl    %ecx                    # store flags in ecx
                    399:        movl    $-1,%eax
                    400:        movl    $4,%ebx
                    401:        divl    %ebx                    # do a long division
                    402:        pushfl
                    403:        popl    %eax
                    404:        xorl    %ecx,%eax               # are the flags different?
                    405:        testl   $0x8d5,%eax             # only check C|PF|AF|Z|N|V
                    406:        jne     2f                      # yes; must be Cyrix 6x86 CPU
                    407:        movl    $CPU_486DLC,RELOC(cpu)  # set CPU type
                    408:
                    409: #ifndef CYRIX_CACHE_WORKS
                    410:        /* Disable caching of the ISA hole only. */
                    411:        invd
                    412:        movb    $CCR0,%al               # Configuration Register index (CCR0)
                    413:        outb    %al,$0x22
                    414:        inb     $0x23,%al
                    415:        orb     $(CCR0_NC1|CCR0_BARB),%al
                    416:        movb    %al,%ah
                    417:        movb    $CCR0,%al
                    418:        outb    %al,$0x22
                    419:        movb    %ah,%al
                    420:        outb    %al,$0x23
                    421:        invd
                    422: #else /* CYRIX_CACHE_WORKS */
                    423:        /* Set cache parameters */
                    424:        invd                            # Start with guaranteed clean cache
                    425:        movb    $CCR0,%al               # Configuration Register index (CCR0)
                    426:        outb    %al,$0x22
                    427:        inb     $0x23,%al
                    428:        andb    $~CCR0_NC0,%al
                    429: #ifndef CYRIX_CACHE_REALLY_WORKS
                    430:        orb     $(CCR0_NC1|CCR0_BARB),%al
                    431: #else
                    432:        orb     $CCR0_NC1,%al
                    433: #endif
                    434:        movb    %al,%ah
                    435:        movb    $CCR0,%al
                    436:        outb    %al,$0x22
                    437:        movb    %ah,%al
                    438:        outb    %al,$0x23
                    439:        /* clear non-cacheable region 1 */
                    440:        movb    $(NCR1+2),%al
                    441:        outb    %al,$0x22
                    442:        movb    $NCR_SIZE_0K,%al
                    443:        outb    %al,$0x23
                    444:        /* clear non-cacheable region 2 */
                    445:        movb    $(NCR2+2),%al
                    446:        outb    %al,$0x22
                    447:        movb    $NCR_SIZE_0K,%al
                    448:        outb    %al,$0x23
                    449:        /* clear non-cacheable region 3 */
                    450:        movb    $(NCR3+2),%al
                    451:        outb    %al,$0x22
                    452:        movb    $NCR_SIZE_0K,%al
                    453:        outb    %al,$0x23
                    454:        /* clear non-cacheable region 4 */
                    455:        movb    $(NCR4+2),%al
                    456:        outb    %al,$0x22
                    457:        movb    $NCR_SIZE_0K,%al
                    458:        outb    %al,$0x23
                    459:        /* enable caching in CR0 */
                    460:        movl    %cr0,%eax
                    461:        andl    $~(CR0_CD|CR0_NW),%eax
                    462:        movl    %eax,%cr0
                    463:        invd
                    464: #endif /* CYRIX_CACHE_WORKS */
                    465:
                    466:        jmp     2f
                    467:
                    468: try586:        /* Use the `cpuid' instruction. */
                    469:        xorl    %eax,%eax
                    470:        cpuid
                    471:        movl    %eax,RELOC(cpu_info_primary)+CPU_INFO_LEVEL
                    472:
                    473: 2:
                    474:        /*
                    475:         * Finished with old stack; load new %esp now instead of later so we
                    476:         * can trace this code without having to worry about the trace trap
                    477:         * clobbering the memory test or the zeroing of the bss+bootstrap page
                    478:         * tables.
                    479:         *
                    480:         * The boot program should check:
                    481:         *      text+data <= &stack_variable - more_space_for_stack
                    482:         *      text+data+bss+pad+space_for_page_tables <= end_of_memory
                    483:         * Oops, the gdt is in the carcass of the boot program so clearing
                    484:         * the rest of memory is still not possible.
                    485:         */
                    486:        movl    $_RELOC(tmpstk),%esp    # bootstrap stack end location
                    487:
                    488: /*
                    489:  * Virtual address space of kernel:
                    490:  *
1.53      yamt      491:  * text | data | bss | [syms] | page dir | proc0 kstack | L1 ptp
1.1       fvdl      492:  *                           0          1       2      3
                    493:  */
1.53      yamt      494:
                    495: #define        PROC0_PDIR_OFF  0
                    496: #define        PROC0_STK_OFF   (PROC0_PDIR_OFF + PAGE_SIZE)
                    497: #define        PROC0_PTP1_OFF  (PROC0_STK_OFF + UPAGES * PAGE_SIZE)
                    498:
                    499: /*
                    500:  * fillkpt
                    501:  *     eax = pte (page frame | control | status)
                    502:  *     ebx = page table address
                    503:  *     ecx = number of pages to map
                    504:  */
                    505:
                    506: #define fillkpt        \
                    507: 1:     movl    %eax,(%ebx)     ;       /* store phys addr */ \
                    508:        addl    $4,%ebx         ;       /* next pte/pde */ \
                    509:        addl    $PAGE_SIZE,%eax ;       /* next phys page */ \
                    510:        loop    1b              ;  \
                    511:
1.1       fvdl      512:
                    513:        /* Find end of kernel image. */
                    514:        movl    $RELOC(end),%edi
1.8       fvdl      515: #if (NKSYMS || defined(DDB) || defined(LKM)) && !defined(SYMTAB_SPACE)
1.1       fvdl      516:        /* Save the symbols (if loaded). */
                    517:        movl    RELOC(esym),%eax
                    518:        testl   %eax,%eax
                    519:        jz      1f
1.35      yamt      520:        subl    $KERNBASE,%eax
1.1       fvdl      521:        movl    %eax,%edi
                    522: 1:
                    523: #endif
                    524:
1.53      yamt      525:        /* Compute sizes */
1.1       fvdl      526:        movl    %edi,%esi                       # edi = esym ? esym : end
                    527:        addl    $PGOFSET,%esi                   # page align up
                    528:        andl    $~PGOFSET,%esi
                    529:
1.53      yamt      530:        /* nkptp[1] = (esi + ~L2_FRAME) >> L2_SHIFT + 1; */
                    531:        movl    %esi,%eax
                    532:        addl    $~L2_FRAME,%eax
                    533:        shrl    $L2_SHIFT,%eax
                    534:        incl    %eax            /* one more ptp for VAs stolen by bootstrap */
                    535: 1:     movl    %eax,RELOC(nkptp)+1*4
                    536:
                    537:        /* tablesize = (1 + UPAGES + nkptp) << PGSHIFT; */
                    538:        addl    $(1+UPAGES),%eax
                    539:        shll    $PGSHIFT,%eax
                    540:        movl    %eax,RELOC(tablesize)
                    541:
                    542:        /* ensure that nkptp covers bootstrap tables */
                    543:        addl    %esi,%eax
                    544:        addl    $~L2_FRAME,%eax
                    545:        shrl    $L2_SHIFT,%eax
                    546:        incl    %eax
                    547:        cmpl    %eax,RELOC(nkptp)+1*4
                    548:        jnz     1b
                    549:
                    550:        /* Clear tables */
                    551:        movl    %esi,%edi
1.1       fvdl      552:        xorl    %eax,%eax
                    553:        cld
1.53      yamt      554:        movl    RELOC(tablesize),%ecx
                    555:        shrl    $2,%ecx
1.1       fvdl      556:        rep
                    557:        stosl
                    558:
1.53      yamt      559:        leal    (PROC0_PTP1_OFF)(%esi), %ebx
1.1       fvdl      560:
                    561: /*
                    562:  * Build initial page tables.
                    563:  */
1.53      yamt      564:        /*
                    565:         * Compute &__data_start - KERNBASE. This can't be > 4G,
                    566:         * or we can't deal with it anyway, since we can't load it in
                    567:         * 32 bit mode. So use the bottom 32 bits.
                    568:         */
                    569:        movl    $RELOC(__data_start),%edx
1.1       fvdl      570:        andl    $~PGOFSET,%edx
1.30      junyoung  571:
1.53      yamt      572:        /*
                    573:         * Skip the first MB.
                    574:         */
1.1       fvdl      575:        movl    $_RELOC(KERNTEXTOFF),%eax
                    576:        movl    %eax,%ecx
1.53      yamt      577:        shrl    $(PGSHIFT-2),%ecx       /* ((n >> PGSHIFT) << 2) for # pdes */
                    578:        addl    %ecx,%ebx
1.1       fvdl      579:
                    580:        /* Map the kernel text read-only. */
                    581:        movl    %edx,%ecx
                    582:        subl    %eax,%ecx
                    583:        shrl    $PGSHIFT,%ecx
                    584:        orl     $(PG_V|PG_KR),%eax
                    585:        fillkpt
                    586:
                    587:        /* Map the data, BSS, and bootstrap tables read-write. */
                    588:        leal    (PG_V|PG_KW)(%edx),%eax
1.53      yamt      589:        movl    RELOC(tablesize),%ecx
1.1       fvdl      590:        addl    %esi,%ecx                               # end of tables
                    591:        subl    %edx,%ecx                               # subtract end of text
                    592:        shrl    $PGSHIFT,%ecx
                    593:        fillkpt
                    594:
1.53      yamt      595:        /* Map ISA I/O mem (later atdevbase) */
1.1       fvdl      596:        movl    $(IOM_BEGIN|PG_V|PG_KW/*|PG_N*/),%eax   # having these bits set
                    597:        movl    $(IOM_SIZE>>PGSHIFT),%ecx               # for this many pte s,
                    598:        fillkpt
                    599:
                    600: /*
                    601:  * Construct a page table directory.
                    602:  */
1.53      yamt      603:        /* Set up top level entries for identity mapping */
                    604:        leal    (PROC0_PDIR_OFF)(%esi),%ebx
                    605:        leal    (PROC0_PTP1_OFF)(%esi),%eax
                    606:        orl     $(PG_V|PG_KW), %eax
                    607:        movl    RELOC(nkptp)+1*4,%ecx
1.1       fvdl      608:        fillkpt
                    609:
1.53      yamt      610:        /* Set up top level entries for actual kernel mapping */
                    611:        leal    (PROC0_PDIR_OFF + L2_SLOT_KERNBASE*4)(%esi),%ebx
                    612:        leal    (PROC0_PTP1_OFF)(%esi),%eax
                    613:        orl     $(PG_V|PG_KW), %eax
                    614:        movl    RELOC(nkptp)+1*4,%ecx
1.1       fvdl      615:        fillkpt
                    616:
                    617:        /* Install a PDE recursively mapping page directory as a page table! */
1.53      yamt      618:        leal    (PROC0_PDIR_OFF + PDIR_SLOT_PTE*4)(%esi),%ebx
                    619:        leal    (PROC0_PDIR_OFF)(%esi),%eax
                    620:        orl     $(PG_V|PG_KW),%eax
                    621:        movl    %eax,(%ebx)
                    622:
1.1       fvdl      623:
1.31      junyoung  624:        /* Save phys. addr of PDP, for libkvm. */
                    625:        movl    %esi,RELOC(PDPpaddr)
1.1       fvdl      626:
1.53      yamt      627:        /*
                    628:         * Startup checklist:
                    629:         * 1. Load %cr3 with pointer to PDIR.
                    630:         */
1.1       fvdl      631:        movl    %esi,%eax               # phys address of ptd in proc 0
                    632:        movl    %eax,%cr3               # load ptd addr into mmu
1.53      yamt      633:
                    634:        /*
                    635:         * 2. Enable paging and the rest of it.
                    636:         */
1.1       fvdl      637:        movl    %cr0,%eax               # get control word
                    638:                                        # enable paging & NPX emulation
                    639:        orl     $(CR0_PE|CR0_PG|CR0_NE|CR0_TS|CR0_EM|CR0_MP),%eax
                    640:        movl    %eax,%cr0               # and let's page NOW!
                    641:
                    642:        pushl   $begin                  # jump to high mem
                    643:        ret
                    644:
                    645: begin:
1.53      yamt      646:        /*
                    647:         * We have arrived.
                    648:         * There's no need anymore for the identity mapping in low
                    649:         * memory, remove it.
                    650:         */
                    651:        movl    _C_LABEL(nkptp)+1*4,%ecx
                    652:        leal    (PROC0_PDIR_OFF)(%esi),%ebx     # old, phys  address of PDIR
                    653:        addl    $(KERNBASE), %ebx       # new, virtual address of PDIR
1.1       fvdl      654: 1:     movl    $0,(%ebx)
1.53      yamt      655:        addl    $4,%ebx
1.1       fvdl      656:        loop    1b
                    657:
                    658:        /* Relocate atdevbase. */
1.53      yamt      659:        movl    $KERNBASE,%edx
                    660:        addl    _C_LABEL(tablesize),%edx
1.1       fvdl      661:        addl    %esi,%edx
                    662:        movl    %edx,_C_LABEL(atdevbase)
                    663:
                    664:        /* Set up bootstrap stack. */
1.53      yamt      665:        leal    (PROC0_STK_OFF+KERNBASE)(%esi),%eax
1.40      yamt      666:        movl    %eax,_C_LABEL(proc0uarea)
                    667:        leal    (KSTACK_SIZE-FRAMESIZE)(%eax),%esp
                    668:        movl    %esi,(KSTACK_SIZE+PCB_CR3)(%eax)        # pcb->pcb_cr3
1.1       fvdl      669:        xorl    %ebp,%ebp               # mark end of frames
                    670:
1.37      jmmv      671: #if defined(MULTIBOOT)
                    672:        /* It is now safe to parse the Multiboot information structure
                    673:         * we saved before from C code.  Note that we cannot delay its
                    674:         * parsing any more because initgdt (called below) needs to make
                    675:         * use of this information. */
                    676:        call    _C_LABEL(multiboot_post_reloc)
                    677: #endif
                    678:
1.1       fvdl      679:        subl    $NGDT*8, %esp           # space for temporary gdt
                    680:        pushl   %esp
                    681:        call    _C_LABEL(initgdt)
                    682:        addl    $4,%esp
1.30      junyoung  683:
1.53      yamt      684:        movl    _C_LABEL(tablesize),%eax
1.1       fvdl      685:        addl    %esi,%eax               # skip past stack and page tables
                    686:
                    687:        pushl   %eax
                    688:        call    _C_LABEL(init386)       # wire 386 chip for unix operation
                    689:        addl    $4+NGDT*8,%esp          # pop temporary gdt
                    690:
                    691: #ifdef SAFARI_FIFO_HACK
                    692:        movb    $5,%al
                    693:        movw    $0x37b,%dx
                    694:        outb    %al,%dx
                    695:        movw    $0x37f,%dx
                    696:        inb     %dx,%al
                    697:        movb    %al,%cl
                    698:
                    699:        orb     $1,%cl
                    700:
                    701:        movb    $5,%al
                    702:        movw    $0x37b,%dx
                    703:        outb    %al,%dx
                    704:        movw    $0x37f,%dx
                    705:        movb    %cl,%al
                    706:        outb    %al,%dx
                    707: #endif /* SAFARI_FIFO_HACK */
                    708:
                    709:        call    _C_LABEL(main)
1.62      bouyer    710: #else /* XEN */
                    711: start:
                    712:        /* First, reset the PSL. */
                    713:        pushl   $PSL_MBO
                    714:        popfl
                    715:
                    716:        cld
                    717: #ifdef XEN3
                    718:        movl    %esp, %ebx              # save start of available space
                    719: #else
                    720:        movl    %esi,%ebx               # save start_info pointer
                    721: #endif
                    722:        movl    $_RELOC(tmpstk),%esp    # bootstrap stack end location
                    723:
                    724:         /* Clear BSS first so that there are no surprises... */
                    725:        xorl    %eax,%eax
                    726:        movl    $RELOC(__bss_start),%edi
                    727:        movl    $RELOC(_end),%ecx
                    728:        subl    %edi,%ecx
                    729:        rep stosb
                    730:
                    731:        /* Copy the necessary stuff from start_info structure. */
                    732:         /* We need to copy shared_info early, so that sti/cli work */
                    733:        movl    $RELOC(start_info_union),%edi
                    734:        movl    $128,%ecx
                    735:        rep movsl
                    736:
                    737:        /* Clear segment registers; always null in proc0. */
                    738:        xorl    %eax,%eax
                    739:        movw    %ax,%fs
                    740:        movw    %ax,%gs
                    741:        decl    %eax
                    742:        movl    %eax,RELOC(cpu_info_primary)+CPU_INFO_LEVEL
                    743:
                    744:        xorl    %eax,%eax
                    745:        cpuid
                    746:        movl    %eax,RELOC(cpu_info_primary)+CPU_INFO_LEVEL
                    747:
                    748:        call    xen_pmap_bootstrap
                    749:        /*
                    750:         * First avail returned by xen_pmap_bootstrap in %eax
                    751:         */
                    752:        movl    %eax, %esi;
                    753:        movl    %esi, _C_LABEL(proc0uarea)
                    754:
                    755: #define PROC0PDIR       ((0)              * PAGE_SIZE)
                    756: #define PROC0STACK      ((1)              * PAGE_SIZE)
                    757:
                    758:        /* Set up bootstrap stack. */
                    759:        leal    (KSTACK_SIZE-FRAMESIZE)(%eax),%esp
                    760:        xorl    %ebp,%ebp               # mark end of frames
                    761:
                    762:        addl    $USPACE, %esi
                    763:        subl    $KERNBASE, %esi         #init386 want a physical address
                    764:        pushl   %esi
                    765:        call    _C_LABEL(init386)       # wire 386 chip for unix operation
                    766:        addl    $4,%esp
                    767:        call    _C_LABEL(main)
                    768:
                    769: #if defined(XEN3) && !defined(XEN_COMPAT_030001)
                    770: /* space for the hypercall call page */
                    771: #define HYPERCALL_PAGE_OFFSET 0x1000
                    772: .org HYPERCALL_PAGE_OFFSET
                    773: ENTRY(hypercall_page)
                    774: .skip 0x1000
                    775: #endif /* defined(XEN3) && !defined(XEN_COMPAT_030001) */
                    776:
                    777: /*
                    778:  * void lgdt_finish(void);
                    779:  * Finish load a new GDT pointer (do any necessary cleanup).
                    780:  * XXX It's somewhat questionable whether reloading all the segment registers
                    781:  * is necessary, since the actual descriptor data is not changed except by
                    782:  * process creation and exit, both of which clean up via task switches.  OTOH,
                    783:  * this only happens at run time when the GDT is resized.
                    784:  */
                    785: /* LINTSTUB: Func: void lgdt_finish(void) */
                    786: NENTRY(lgdt_finish)
                    787:        movl    $GSEL(GDATA_SEL, SEL_KPL),%eax
                    788:        movw    %ax,%ds
                    789:        movw    %ax,%es
                    790:        movw    %ax,%gs
                    791:        movw    %ax,%ss
                    792:        movl    $GSEL(GCPU_SEL, SEL_KPL),%eax
                    793:        movw    %ax,%fs
                    794:        /* Reload code selector by doing intersegment return. */
                    795:        popl    %eax
                    796:        pushl   $GSEL(GCODE_SEL, SEL_KPL)
                    797:        pushl   %eax
                    798:        lret
                    799:
                    800: #endif /* XEN */
1.1       fvdl      801:
                    802: /*
1.48      yamt      803:  * void lwp_trampoline(void);
                    804:  *
1.1       fvdl      805:  * This is a trampoline function pushed onto the stack of a newly created
                    806:  * process in order to do some additional setup.  The trampoline is entered by
                    807:  * cpu_switch()ing to the process, so we abuse the callee-saved registers used
                    808:  * by cpu_switch() to store the information about the stub to call.
                    809:  * NOTE: This function does not have a normal calling sequence!
                    810:  */
1.48      yamt      811: NENTRY(lwp_trampoline)
1.68      ad        812:        movl    %ebp,%edi       /* for .Lsyscall_checkast */
1.48      yamt      813:        xorl    %ebp,%ebp
1.68      ad        814:        pushl   %edi
1.48      yamt      815:        pushl   %eax
                    816:        call    _C_LABEL(lwp_startup)
                    817:        addl    $8,%esp
1.1       fvdl      818:        pushl   %ebx
                    819:        call    *%esi
                    820:        addl    $4,%esp
1.68      ad        821:        jmp     .Lsyscall_checkast
1.1       fvdl      822:        /* NOTREACHED */
                    823:
                    824: /*
1.48      yamt      825:  * sigcode()
                    826:  *
                    827:  * Signal trampoline; copied to top of user stack.  Used only for
                    828:  * compatibility with old releases of NetBSD.
1.1       fvdl      829:  */
                    830: NENTRY(sigcode)
                    831:        /*
                    832:         * Handler has returned here as if we called it.  The sigcontext
                    833:         * is on the stack after the 3 args "we" pushed.
                    834:         */
                    835:        leal    12(%esp),%eax           # get pointer to sigcontext
                    836:        movl    %eax,4(%esp)            # put it in the argument slot
                    837:                                        # fake return address already there
1.17      christos  838:        movl    $SYS_compat_16___sigreturn14,%eax
1.1       fvdl      839:        int     $0x80                   # enter kernel with args on stack
                    840:        movl    $SYS_exit,%eax
                    841:        int     $0x80                   # exit if sigreturn fails
                    842:        .globl  _C_LABEL(esigcode)
                    843: _C_LABEL(esigcode):
                    844:
                    845: /*
1.48      yamt      846:  * int setjmp(label_t *)
                    847:  *
                    848:  * Used primarily by DDB.
1.1       fvdl      849:  */
                    850: ENTRY(setjmp)
                    851:        movl    4(%esp),%eax
                    852:        movl    %ebx,(%eax)             # save ebx
                    853:        movl    %esp,4(%eax)            # save esp
                    854:        movl    %ebp,8(%eax)            # save ebp
                    855:        movl    %esi,12(%eax)           # save esi
                    856:        movl    %edi,16(%eax)           # save edi
                    857:        movl    (%esp),%edx             # get rta
                    858:        movl    %edx,20(%eax)           # save eip
1.48      yamt      859:        xorl    %eax,%eax               # return 0
1.1       fvdl      860:        ret
                    861:
1.48      yamt      862: /*
                    863:  * int longjmp(label_t *)
                    864:  *
                    865:  * Used primarily by DDB.
                    866:  */
1.1       fvdl      867: ENTRY(longjmp)
                    868:        movl    4(%esp),%eax
                    869:        movl    (%eax),%ebx             # restore ebx
                    870:        movl    4(%eax),%esp            # restore esp
                    871:        movl    8(%eax),%ebp            # restore ebp
                    872:        movl    12(%eax),%esi           # restore esi
                    873:        movl    16(%eax),%edi           # restore edi
                    874:        movl    20(%eax),%edx           # get rta
                    875:        movl    %edx,(%esp)             # put in return frame
1.48      yamt      876:        movl    $1,%eax                 # return 1
1.1       fvdl      877:        ret
                    878:
1.65      skrll     879: /*
                    880:  * void dumpsys(void)
                    881:  *
                    882:  * Mimic cpu_switchto() for postmortem debugging.
                    883:  */
1.64      skrll     884: ENTRY(dumpsys)
1.65      skrll     885:        pushl   %ebx                    # set up fake switchframe
                    886:        pushl   %esi                    #   and save context
                    887:        pushl   %edi
                    888:        movl    %esp,_C_LABEL(dumppcb)+PCB_ESP
                    889:        movl    %ebp,_C_LABEL(dumppcb)+PCB_EBP
                    890:        call    _C_LABEL(dodumpsys)     # dump!
                    891:        addl    $(3*4), %esp            # unwind switchframe
1.64      skrll     892:        ret
                    893:
1.1       fvdl      894: /*
1.58      ad        895:  * struct lwp *cpu_switchto(struct lwp *oldlwp, struct newlwp,
                    896:  *                         bool returning)
1.30      junyoung  897:  *
1.48      yamt      898:  *     1. if (oldlwp != NULL), save its context.
                    899:  *     2. then, restore context of newlwp.
                    900:  *
                    901:  * Note that the stack frame layout is known to "struct switchframe" in
                    902:  * <machine/frame.h> and to the code in cpu_lwp_fork() which initializes
1.5       thorpej   903:  * it for a new lwp.
1.1       fvdl      904:  */
1.48      yamt      905: ENTRY(cpu_switchto)
1.1       fvdl      906:        pushl   %ebx
                    907:        pushl   %esi
                    908:        pushl   %edi
                    909:
1.48      yamt      910:        movl    16(%esp),%esi           # oldlwp
                    911:        movl    20(%esp),%edi           # newlwp
1.58      ad        912:        movl    24(%esp),%edx           # returning
1.48      yamt      913:        testl   %esi,%esi
                    914:        jz      1f
1.1       fvdl      915:
1.48      yamt      916:        /* Save old context. */
                    917:        movl    L_ADDR(%esi),%eax
                    918:        movl    %esp,PCB_ESP(%eax)
                    919:        movl    %ebp,PCB_EBP(%eax)
                    920:
                    921:        /* Switch to newlwp's stack. */
                    922: 1:     movl    L_ADDR(%edi),%ebx
                    923:        movl    PCB_EBP(%ebx),%ebp
                    924:        movl    PCB_ESP(%ebx),%esp
1.1       fvdl      925:
1.61      ad        926:        /*
                    927:         * Set curlwp.  This must be globally visible in order to permit
                    928:         * non-interlocked mutex release.
                    929:         */
                    930:        movl    %edi,%ecx
                    931:        xchgl   %ecx,CPUVAR(CURLWP)
1.58      ad        932:
                    933:        /* Skip the rest if returning to a pinned LWP. */
                    934:        testl   %edx,%edx
                    935:        jnz     4f
                    936:
1.62      bouyer    937: #ifdef XEN
                    938:        pushl   %edi
                    939:        call    _C_LABEL(i386_switch_context)
                    940:        addl    $4,%esp
                    941: #else /* XEN */
1.60      yamt      942:        /* Switch ring0 esp */
                    943:        movl    PCB_ESP0(%ebx),%eax
                    944:        movl    %eax,CPUVAR(ESP0)
1.1       fvdl      945:
                    946:        /* Don't bother with the rest if switching to a system process. */
1.48      yamt      947:        testl   $LW_SYSTEM,L_FLAG(%edi)
                    948:        jnz     4f
1.1       fvdl      949:
1.54      ad        950:        /* Restore thread-private %fs/%gs descriptors. */
1.60      yamt      951:        movl    CPUVAR(GDT),%ecx
1.55      ad        952:        movl    PCB_FSD(%ebx), %eax
                    953:        movl    PCB_FSD+4(%ebx), %edx
1.54      ad        954:        movl    %eax, (GUFS_SEL*8)(%ecx)
                    955:        movl    %edx, (GUFS_SEL*8+4)(%ecx)
1.55      ad        956:        movl    PCB_GSD(%ebx), %eax
                    957:        movl    PCB_GSD+4(%ebx), %edx
1.54      ad        958:        movl    %eax, (GUGS_SEL*8)(%ecx)
                    959:        movl    %edx, (GUGS_SEL*8+4)(%ecx)
1.62      bouyer    960: #endif /* XEN */
1.54      ad        961:
1.60      yamt      962:        /* Switch I/O bitmap */
                    963:        movl    PCB_IOMAP(%ebx),%eax
                    964:        orl     %eax,%eax
                    965:        jnz,pn  .Lcopy_iobitmap
                    966:        movl    $(IOMAP_INVALOFF << 16),CPUVAR(IOBASE)
                    967: .Liobitmap_done:
                    968:
1.56      ad        969:        /* Is this process using RAS (restartable atomic sequences)? */
                    970:        movl    L_PROC(%edi),%eax
                    971:        cmpl    $0,P_RASLIST(%eax)
                    972:        jne     5f
                    973:
1.48      yamt      974:        /*
                    975:         * Restore cr0 (including FPU state).  Raise the IPL to IPL_IPI.
                    976:         * FPU IPIs can alter the LWP's saved cr0.  Dropping the priority
                    977:         * is deferred until mi_switch(), when cpu_switchto() returns.
                    978:         */
1.62      bouyer    979: 2:
                    980: #ifndef XEN
                    981:        movl    $IPL_IPI,CPUVAR(ILEVEL)
1.48      yamt      982:        movl    PCB_CR0(%ebx),%ecx
                    983:        movl    %cr0,%edx
1.1       fvdl      984:
1.30      junyoung  985:        /*
1.22      wiz       986:         * If our floating point registers are on a different CPU,
1.48      yamt      987:         * set CR0_TS so we'll trap rather than reuse bogus state.
1.1       fvdl      988:         */
1.48      yamt      989:        movl    PCB_FPCPU(%ebx),%eax
                    990:        cmpl    CPUVAR(SELF),%eax
                    991:        je      3f
1.1       fvdl      992:        orl     $CR0_TS,%ecx
1.48      yamt      993:
                    994:        /* Reloading CR0 is very expensive - avoid if possible. */
                    995: 3:     cmpl    %edx,%ecx
                    996:        je      4f
1.1       fvdl      997:        movl    %ecx,%cr0
1.62      bouyer    998: #endif /* XEN */
1.1       fvdl      999:
1.48      yamt     1000:        /* Return to the new LWP, returning 'oldlwp' in %eax. */
                   1001: 4:     movl    %esi,%eax
1.1       fvdl     1002:        popl    %edi
                   1003:        popl    %esi
                   1004:        popl    %ebx
                   1005:        ret
1.20      dsl      1006:
1.48      yamt     1007:        /* Check for restartable atomic sequences (RAS). */
                   1008: 5:     movl    L_MD_REGS(%edi),%ecx
                   1009:        pushl   TF_EIP(%ecx)
1.20      dsl      1010:        pushl   %eax
                   1011:        call    _C_LABEL(ras_lookup)
                   1012:        addl    $8,%esp
                   1013:        cmpl    $-1,%eax
1.48      yamt     1014:        je      2b
1.49      ad       1015:        movl    L_MD_REGS(%edi),%ecx
                   1016:        movl    %eax,TF_EIP(%ecx)
1.48      yamt     1017:        jmp     2b
1.1       fvdl     1018:
1.60      yamt     1019: .Lcopy_iobitmap:
                   1020:        /* Copy I/O bitmap. */
                   1021:        movl    $(IOMAPSIZE/4),%ecx
                   1022:        pushl   %esi
                   1023:        pushl   %edi
                   1024:        movl    %eax,%esi               /* pcb_iomap */
                   1025:        movl    CPUVAR(SELF),%edi
                   1026:        leal    CPU_INFO_IOMAP(%edi),%edi
                   1027:        rep
                   1028:        movsl
                   1029:        popl    %edi
                   1030:        popl    %esi
                   1031:        movl    $((CPU_INFO_IOMAP - CPU_INFO_TSS) << 16),CPUVAR(IOBASE)
                   1032:        jmp     .Liobitmap_done
                   1033:
1.1       fvdl     1034: /*
                   1035:  * void savectx(struct pcb *pcb);
1.48      yamt     1036:  *
1.1       fvdl     1037:  * Update pcb, saving current processor state.
                   1038:  */
                   1039: ENTRY(savectx)
1.47      skrll    1040:        movl    4(%esp),%edx            # edx = pcb
1.1       fvdl     1041:        movl    %esp,PCB_ESP(%edx)
                   1042:        movl    %ebp,PCB_EBP(%edx)
                   1043:        ret
                   1044:
                   1045: /*
1.48      yamt     1046:  * osyscall()
                   1047:  *
1.1       fvdl     1048:  * Old call gate entry for syscall
                   1049:  */
                   1050: IDTVEC(osyscall)
1.48      yamt     1051:        pushfl                  # set eflags in trap frame
1.1       fvdl     1052:        popl    8(%esp)
                   1053:        pushl   $7              # size of instruction for restart
                   1054:        jmp     syscall1
                   1055:
                   1056: /*
1.48      yamt     1057:  * syscall()
                   1058:  *
1.1       fvdl     1059:  * Trap gate entry for syscall
                   1060:  */
                   1061: IDTVEC(syscall)
                   1062:        pushl   $2              # size of instruction for restart
                   1063: syscall1:
                   1064:        pushl   $T_ASTFLT       # trap # for doing ASTs
                   1065:        INTRENTRY
                   1066: #ifdef DIAGNOSTIC
                   1067:        movl    CPUVAR(ILEVEL),%ebx
                   1068:        testl   %ebx,%ebx
                   1069:        jz      1f
                   1070:        pushl   $5f
                   1071:        call    _C_LABEL(printf)
                   1072:        addl    $4,%esp
                   1073: #ifdef DDB
                   1074:        int     $3
                   1075: #endif
1.30      junyoung 1076: 1:
1.1       fvdl     1077: #endif /* DIAGNOSTIC */
1.67      ad       1078:        incl    CPUVAR(NSYSCALL)        # count it atomically
1.68      ad       1079:        movl    CPUVAR(CURLWP),%edi
                   1080:        movl    L_PROC(%edi),%edx
                   1081:        movl    %esp,L_MD_REGS(%edi)    # save pointer to frame
1.15      fvdl     1082:        pushl   %esp
1.1       fvdl     1083:        call    *P_MD_SYSCALL(%edx)     # get pointer to syscall() function
1.15      fvdl     1084:        addl    $4,%esp
1.27      yamt     1085: .Lsyscall_checkast:
1.24      yamt     1086:        /* Check for ASTs on exit to user mode. */
1.62      bouyer   1087:        CLI(%eax)
1.68      ad       1088:        movl    L_MD_ASTPENDING(%edi), %eax
                   1089:        orl     CPUVAR(WANT_PMAPLOAD), %eax
1.24      yamt     1090:        jnz     9f
1.62      bouyer   1091: #ifdef XEN
                   1092:        STIC(%eax)
                   1093:        jz      14f
                   1094:        call    _C_LABEL(stipending)
                   1095:        testl   %eax,%eax
                   1096:        jz      14f
                   1097:        /* process pending interrupts */
                   1098:        CLI(%eax)
                   1099:        movl    CPUVAR(ILEVEL), %ebx
                   1100:        movl    $.Lsyscall_resume, %esi # address to resume loop at
                   1101: .Lsyscall_resume:
                   1102:        movl    %ebx,%eax       # get cpl
                   1103:        movl    CPUVAR(IUNMASK)(,%eax,4),%eax
                   1104:        andl    CPUVAR(IPENDING),%eax   # any non-masked bits left?
                   1105:        jz      17f
                   1106:        bsrl    %eax,%eax
                   1107:        btrl    %eax,CPUVAR(IPENDING)
                   1108:        movl    CPUVAR(ISOURCES)(,%eax,4),%eax
                   1109:        jmp     *IS_RESUME(%eax)
                   1110: 17:    movl    %ebx, CPUVAR(ILEVEL)    #restore cpl
                   1111:        jmp     .Lsyscall_checkast
                   1112: 14:
                   1113: #endif /* XEN */
1.1       fvdl     1114: #ifndef DIAGNOSTIC
1.24      yamt     1115:        INTRFASTEXIT
1.1       fvdl     1116: #else /* DIAGNOSTIC */
1.24      yamt     1117:        cmpl    $IPL_NONE,CPUVAR(ILEVEL)
1.1       fvdl     1118:        jne     3f
                   1119:        INTRFASTEXIT
1.62      bouyer   1120: 3:     STI(%eax)
1.1       fvdl     1121:        pushl   $4f
                   1122:        call    _C_LABEL(printf)
                   1123:        addl    $4,%esp
1.58      ad       1124:        pushl   $IPL_NONE
                   1125:        call    _C_LABEL(spllower)
                   1126:        addl    $4,%esp
1.53      yamt     1127:        jmp     .Lsyscall_checkast
1.1       fvdl     1128: 4:     .asciz  "WARNING: SPL NOT LOWERED ON SYSCALL EXIT\n"
1.30      junyoung 1129: 5:     .asciz  "WARNING: SPL NOT ZERO ON SYSCALL ENTRY\n"
1.1       fvdl     1130: #endif /* DIAGNOSTIC */
1.68      ad       1131: 9:
                   1132:        cmpl    $0, CPUVAR(WANT_PMAPLOAD)
                   1133:        jz      10f
                   1134:        STI(%eax)
1.24      yamt     1135:        call    _C_LABEL(pmap_load)
1.27      yamt     1136:        jmp     .Lsyscall_checkast      /* re-check ASTs */
1.68      ad       1137: 10:
                   1138:        /* Always returning to user mode here. */
                   1139:        movl    $0, L_MD_ASTPENDING(%edi)
                   1140:        STI(%eax)
                   1141:        /* Pushed T_ASTFLT into tf_trapno on entry. */
                   1142:        pushl   %esp
                   1143:        call    _C_LABEL(trap)
                   1144:        addl    $4,%esp
                   1145:        jmp     .Lsyscall_checkast      /* re-check ASTs */
1.1       fvdl     1146:
                   1147: #if NNPX > 0
                   1148: /*
                   1149:  * Special interrupt handlers.  Someday intr0-intr15 will be used to count
                   1150:  * interrupts.  We'll still need a special exception 16 handler.  The busy
                   1151:  * latch stuff in probintr() can be moved to npxprobe().
                   1152:  */
                   1153:
1.48      yamt     1154: /*
                   1155:  * void probeintr(void)
                   1156:  */
1.1       fvdl     1157: NENTRY(probeintr)
                   1158:        ss
                   1159:        incl    _C_LABEL(npx_intrs_while_probing)
                   1160:        pushl   %eax
                   1161:        movb    $0x20,%al       # EOI (asm in strings loses cpp features)
                   1162:        outb    %al,$0xa0       # IO_ICU2
                   1163:        outb    %al,$0x20       # IO_ICU1
                   1164:        movb    $0,%al
                   1165:        outb    %al,$0xf0       # clear BUSY# latch
                   1166:        popl    %eax
                   1167:        iret
                   1168:
1.48      yamt     1169: /*
                   1170:  * void probetrap(void)
                   1171:  */
1.1       fvdl     1172: NENTRY(probetrap)
                   1173:        ss
                   1174:        incl    _C_LABEL(npx_traps_while_probing)
                   1175:        fnclex
                   1176:        iret
                   1177:
1.48      yamt     1178: /*
                   1179:  * int npx586bug1(int a, int b)
                   1180:  */
1.1       fvdl     1181: NENTRY(npx586bug1)
                   1182:        fildl   4(%esp)         # x
                   1183:        fildl   8(%esp)         # y
                   1184:        fld     %st(1)
                   1185:        fdiv    %st(1),%st      # x/y
                   1186:        fmulp   %st,%st(1)      # (x/y)*y
                   1187:        fsubrp  %st,%st(1)      # x-(x/y)*y
                   1188:        pushl   $0
                   1189:        fistpl  (%esp)
                   1190:        popl    %eax
                   1191:        ret
                   1192: #endif /* NNPX > 0 */
1.50      ad       1193:
                   1194: /*
                   1195:  * void sse2_zero_page(void *pg)
                   1196:  *
                   1197:  * Zero a page without polluting the cache.
                   1198:  */
                   1199: ENTRY(sse2_zero_page)
                   1200:        pushl   %ebp
                   1201:        movl    %esp,%ebp
                   1202:        movl    8(%esp), %edx
                   1203:        movl    $PAGE_SIZE, %ecx
                   1204:        xorl    %eax, %eax
                   1205:        .align  16
                   1206: 1:
                   1207:        movnti  %eax, 0(%edx)
                   1208:        movnti  %eax, 4(%edx)
                   1209:        movnti  %eax, 8(%edx)
                   1210:        movnti  %eax, 12(%edx)
                   1211:        movnti  %eax, 16(%edx)
                   1212:        movnti  %eax, 20(%edx)
                   1213:        movnti  %eax, 24(%edx)
                   1214:        movnti  %eax, 28(%edx)
                   1215:        subl    $32, %ecx
                   1216:        leal    32(%edx), %edx
                   1217:        jnz     1b
                   1218:        sfence
                   1219:        pop     %ebp
                   1220:        ret
                   1221:
                   1222: /*
                   1223:  * void sse2_copy_page(void *src, void *dst)
                   1224:  *
                   1225:  * Copy a page without polluting the cache.
                   1226:  */
                   1227: ENTRY(sse2_copy_page)
                   1228:        pushl   %ebp
                   1229:        pushl   %ebx
                   1230:        pushl   %esi
                   1231:        pushl   %edi
                   1232:        movl    20(%esp), %esi
                   1233:        movl    24(%esp), %edi
                   1234:        movl    $PAGE_SIZE, %ebp
                   1235:        .align  16
                   1236: 1:
                   1237:        movl    0(%esi), %eax
                   1238:        movl    4(%esi), %ebx
                   1239:        movl    8(%esi), %ecx
                   1240:        movl    12(%esi), %edx
                   1241:        movnti  %eax, 0(%edi)
                   1242:        movnti  %ebx, 4(%edi)
                   1243:        movnti  %ecx, 8(%edi)
                   1244:        movnti  %edx, 12(%edi)
                   1245:        subl    $16, %ebp
                   1246:        leal    16(%esi), %esi
                   1247:        leal    16(%edi), %edi
                   1248:        jnz     1b
                   1249:        sfence
                   1250:        popl    %edi
                   1251:        popl    %esi
                   1252:        popl    %ebx
                   1253:        popl    %ebp
                   1254:        ret

CVSweb <webmaster@jp.NetBSD.org>