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Annotation of src/sys/arch/i386/i386/locore.S, Revision 1.114

1.114   ! uebayasi    1: /*     $NetBSD$        */
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:  *
                     19:  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
                     20:  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
                     21:  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
                     22:  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
                     23:  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
                     24:  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
                     25:  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
                     26:  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
                     27:  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
                     28:  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
                     29:  *
                     30:  */
                     31:
                     32: /*
1.53      yamt       33:  * Copyright (c) 2001 Wasabi Systems, Inc.
                     34:  * All rights reserved.
                     35:  *
                     36:  * Written by Frank van der Linden for Wasabi Systems, Inc.
                     37:  *
                     38:  * Redistribution and use in source and binary forms, with or without
                     39:  * modification, are permitted provided that the following conditions
                     40:  * are met:
                     41:  * 1. Redistributions of source code must retain the above copyright
                     42:  *    notice, this list of conditions and the following disclaimer.
                     43:  * 2. Redistributions in binary form must reproduce the above copyright
                     44:  *    notice, this list of conditions and the following disclaimer in the
                     45:  *    documentation and/or other materials provided with the distribution.
                     46:  * 3. All advertising materials mentioning features or use of this software
                     47:  *    must display the following acknowledgement:
                     48:  *      This product includes software developed for the NetBSD Project by
                     49:  *      Wasabi Systems, Inc.
                     50:  * 4. The name of Wasabi Systems, Inc. may not be used to endorse
                     51:  *    or promote products derived from this software without specific prior
                     52:  *    written permission.
                     53:  *
                     54:  * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND
                     55:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
                     56:  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
                     57:  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL WASABI SYSTEMS, INC
                     58:  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
                     59:  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
                     60:  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
                     61:  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
                     62:  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
                     63:  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
                     64:  * POSSIBILITY OF SUCH DAMAGE.
                     65:  */
                     66:
1.1       fvdl       67:
                     68: /*-
1.84      ad         69:  * Copyright (c) 1998, 2000, 2004, 2006, 2007, 2009 The NetBSD Foundation, Inc.
1.1       fvdl       70:  * All rights reserved.
                     71:  *
                     72:  * This code is derived from software contributed to The NetBSD Foundation
1.84      ad         73:  * by Charles M. Hannum, and by Andrew Doran.
1.1       fvdl       74:  *
                     75:  * Redistribution and use in source and binary forms, with or without
                     76:  * modification, are permitted provided that the following conditions
                     77:  * are met:
                     78:  * 1. Redistributions of source code must retain the above copyright
                     79:  *    notice, this list of conditions and the following disclaimer.
                     80:  * 2. Redistributions in binary form must reproduce the above copyright
                     81:  *    notice, this list of conditions and the following disclaimer in the
                     82:  *    documentation and/or other materials provided with the distribution.
                     83:  *
                     84:  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
                     85:  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
                     86:  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
                     87:  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
                     88:  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
                     89:  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
                     90:  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
                     91:  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
                     92:  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
                     93:  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
                     94:  * POSSIBILITY OF SUCH DAMAGE.
                     95:  */
                     96:
                     97: /*-
                     98:  * Copyright (c) 1990 The Regents of the University of California.
                     99:  * All rights reserved.
                    100:  *
                    101:  * This code is derived from software contributed to Berkeley by
                    102:  * William Jolitz.
                    103:  *
                    104:  * Redistribution and use in source and binary forms, with or without
                    105:  * modification, are permitted provided that the following conditions
                    106:  * are met:
                    107:  * 1. Redistributions of source code must retain the above copyright
                    108:  *    notice, this list of conditions and the following disclaimer.
                    109:  * 2. Redistributions in binary form must reproduce the above copyright
                    110:  *    notice, this list of conditions and the following disclaimer in the
                    111:  *    documentation and/or other materials provided with the distribution.
1.12      agc       112:  * 3. Neither the name of the University nor the names of its contributors
1.1       fvdl      113:  *    may be used to endorse or promote products derived from this software
                    114:  *    without specific prior written permission.
                    115:  *
                    116:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
                    117:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                    118:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                    119:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
                    120:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                    121:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                    122:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                    123:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                    124:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                    125:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                    126:  * SUCH DAMAGE.
                    127:  *
                    128:  *     @(#)locore.s    7.3 (Berkeley) 5/13/91
                    129:  */
                    130:
1.59      lukem     131: #include <machine/asm.h>
1.114   ! uebayasi  132: __KERNEL_RCSID(0, "$NetBSD$");
1.59      lukem     133:
1.18      christos  134: #include "opt_compat_oldboot.h"
1.114   ! uebayasi  135: #include "opt_copy_symtab.h"
1.1       fvdl      136: #include "opt_ddb.h"
1.83      apb       137: #include "opt_modular.h"
1.78      joerg     138: #include "opt_multiboot.h"
1.1       fvdl      139: #include "opt_realmem.h"
1.18      christos  140: #include "opt_vm86.h"
1.62      bouyer    141: #include "opt_xen.h"
1.1       fvdl      142:
                    143: #include "assym.h"
                    144: #include "lapic.h"
                    145: #include "ioapic.h"
1.8       fvdl      146: #include "ksyms.h"
1.1       fvdl      147:
                    148: #include <sys/errno.h>
                    149: #include <sys/syscall.h>
                    150:
                    151: #include <machine/cputypes.h>
                    152: #include <machine/segments.h>
                    153: #include <machine/specialreg.h>
                    154: #include <machine/trap.h>
                    155: #include <machine/i82489reg.h>
1.48      yamt      156: #include <machine/frameasm.h>
                    157: #include <machine/i82489reg.h>
1.62      bouyer    158: #ifndef XEN
                    159: #include <machine/multiboot.h>
                    160: #endif
1.1       fvdl      161:
                    162: /* XXX temporary kluge; these should not be here */
                    163: /* Get definitions for IOM_BEGIN, IOM_END, and IOM_SIZE */
                    164: #include <dev/isa/isareg.h>
                    165:
1.104     uebayasi  166: #ifndef XEN
                    167: #define        _RELOC(x)       ((x) - KERNBASE)
                    168: #else
                    169: #define        _RELOC(x)       ((x))
                    170: #endif /* XEN */
                    171: #define        RELOC(x)        _RELOC(_C_LABEL(x))
                    172:
1.62      bouyer    173: #ifdef XEN
                    174: /*
                    175:  * Xen guest identifier and loader selection
                    176:  */
                    177: .section __xen_guest
                    178:        .ascii  "GUEST_OS=netbsd,GUEST_VER=3.0,XEN_VER=xen-3.0"
1.106     uebayasi  179:        .ascii  ",VIRT_BASE=0xc0000000" /* KERNBASE */
                    180:        .ascii  ",ELF_PADDR_OFFSET=0xc0000000" /* KERNBASE */
                    181:        .ascii  ",VIRT_ENTRY=0xc0100000" /* KERNTEXTOFF */
                    182:        .ascii  ",HYPERCALL_PAGE=0x00000101"
1.62      bouyer    183:                /* (???+HYPERCALL_PAGE_OFFSET)/PAGE_SIZE) */
1.66      bouyer    184: #ifdef PAE
1.106     uebayasi  185:        .ascii  ",PAE=yes[extended-cr3]"
1.66      bouyer    186: #endif
1.62      bouyer    187:        .ascii  ",LOADER=generic"
1.114   ! uebayasi  188: #if (NKSYMS || defined(DDB) || defined(MODULAR)) && !defined(makeoptions_COPY_SYMTAB)
1.62      bouyer    189:        .ascii  ",BSD_SYMTAB=yes"
                    190: #endif
                    191:        .byte   0
1.106     uebayasi  192: #endif /* XEN */
1.62      bouyer    193:
1.1       fvdl      194: /*
                    195:  * Initialization
                    196:  */
                    197:        .data
                    198:
1.100     chs       199:        .globl  _C_LABEL(cputype)
1.73      ad        200:        .globl  _C_LABEL(cpuid_level)
1.38      jmmv      201:        .globl  _C_LABEL(esym)
1.71      ad        202:        .globl  _C_LABEL(eblob)
1.38      jmmv      203:        .globl  _C_LABEL(atdevbase)
1.104     uebayasi  204:        .globl  _C_LABEL(lwp0uarea)
                    205:        .globl  _C_LABEL(PDPpaddr)
1.1       fvdl      206:        .globl  _C_LABEL(gdt)
                    207:        .globl  _C_LABEL(idt)
1.30      junyoung  208:        .globl  _C_LABEL(lapic_tpr)
                    209:
1.1       fvdl      210: #if NLAPIC > 0
                    211: #ifdef __ELF__
1.7       thorpej   212:        .align  PAGE_SIZE
1.1       fvdl      213: #else
                    214:        .align  12
                    215: #endif
                    216:        .globl _C_LABEL(local_apic), _C_LABEL(lapic_id)
1.104     uebayasi  217:        .type   _C_LABEL(local_apic), @object
                    218: LABEL(local_apic)
1.1       fvdl      219:        .space  LAPIC_ID
1.104     uebayasi  220: END(local_apic)
                    221:        .type   _C_LABEL(lapic_id), @object
                    222: LABEL(lapic_id)
1.1       fvdl      223:        .long   0x00000000
1.106     uebayasi  224:        .space  LAPIC_TPRI-(LAPIC_ID+4)
1.104     uebayasi  225: END(lapic_id)
                    226:        .type   _C_LABEL(lapic_tpr), @object
                    227: LABEL(lapic_tpr)
1.106     uebayasi  228:        .space  LAPIC_PPRI-LAPIC_TPRI
1.104     uebayasi  229: END(lapic_tpr)
                    230:        .type   _C_LABEL(lapic_ppr), @object
1.30      junyoung  231: _C_LABEL(lapic_ppr):
1.1       fvdl      232:        .space  LAPIC_ISR-LAPIC_PPRI
1.104     uebayasi  233: END(lapic_ppr)
                    234:        .type   _C_LABEL(lapic_isr), @object
1.1       fvdl      235: _C_LABEL(lapic_isr):
1.7       thorpej   236:        .space  PAGE_SIZE-LAPIC_ISR
1.104     uebayasi  237: END(lapic_isr)
1.1       fvdl      238: #else
1.104     uebayasi  239:        .type   _C_LABEL(lapic_tpr), @object
                    240: LABEL(lapic_tpr)
1.1       fvdl      241:        .long 0
1.104     uebayasi  242: END(lapic_tpr)
1.1       fvdl      243: #endif
1.104     uebayasi  244:        .type   _C_LABEL(cputype), @object
                    245: LABEL(cputype)         .long   0       # are we 80486, Pentium, or..
                    246: END(cputype)
                    247:        .type   _C_LABEL(cpuid_level), @object
                    248: LABEL(cpuid_level)     .long   0
                    249: END(cpuid_level)
                    250:        .type   _C_LABEL(atdevbase), @object
                    251: LABEL(atdevbase)       .long   0       # location of start of iomem in virtual
                    252: END(atdevbase)
                    253:        .type   _C_LABEL(lwp0uarea), @object
                    254: LABEL(lwp0uarea)       .long   0
                    255: END(lwp0uarea)
                    256:        .type   _C_LABEL(PDPpaddr), @object
                    257: LABEL(PDPpaddr)                .long   0       # paddr of PDP, for libkvm
                    258: END(PDPpaddr)
                    259:        .type   _C_LABEL(tablesize), @object
1.53      yamt      260: _C_LABEL(tablesize):   .long   0
1.104     uebayasi  261: END(tablesize)
                    262:        .size   tmpstk, tmpstk - .
1.63      bouyer    263:        .space 512
1.1       fvdl      264: tmpstk:
1.96      cherry    265: #ifdef XEN
                    266:        .align          PAGE_SIZE, 0x0  # Align on page boundary
1.104     uebayasi  267: LABEL(tmpgdt)
1.96      cherry    268:        .space          PAGE_SIZE       # Xen expects a page
1.104     uebayasi  269: END(tmpgdt)
1.96      cherry    270: #endif /* XEN */
1.1       fvdl      271:
                    272:        .text
                    273:        .globl  _C_LABEL(kernel_text)
                    274:        .set    _C_LABEL(kernel_text),KERNTEXTOFF
                    275:
1.104     uebayasi  276: ENTRY(start)
1.62      bouyer    277: #ifndef XEN
1.104     uebayasi  278:        movw    $0x1234,0x472                   # warm boot
1.37      jmmv      279: #if defined(MULTIBOOT)
                    280:        jmp     1f
                    281:
                    282:        .align  4
                    283:        .globl  Multiboot_Header
                    284: _C_LABEL(Multiboot_Header):
1.44      jmmv      285: #define MULTIBOOT_HEADER_FLAGS (MULTIBOOT_HEADER_WANT_MEMORY)
1.37      jmmv      286:        .long   MULTIBOOT_HEADER_MAGIC
                    287:        .long   MULTIBOOT_HEADER_FLAGS
                    288:        .long   -(MULTIBOOT_HEADER_MAGIC + MULTIBOOT_HEADER_FLAGS)
                    289:
                    290: 1:
                    291:        /* Check if we are being executed by a Multiboot-compliant boot
                    292:         * loader. */
                    293:        cmpl    $MULTIBOOT_INFO_MAGIC,%eax
                    294:        jne     1f
                    295:
1.43      mrg       296:        /*
                    297:         * Indeed, a multiboot-compliant boot loader executed us.  We copy
1.37      jmmv      298:         * the received Multiboot information structure into kernel's data
                    299:         * space to process it later -- after we are relocated.  It will
1.43      mrg       300:         * be safer to run complex C code than doing it at this point.
                    301:         */
1.37      jmmv      302:        pushl   %ebx            # Address of Multiboot information
                    303:        call    _C_LABEL(multiboot_pre_reloc)
                    304:        addl    $4,%esp
1.38      jmmv      305:        jmp     2f
1.37      jmmv      306: #endif
                    307:
                    308: 1:
1.1       fvdl      309:        /*
1.38      jmmv      310:         * At this point, we know that a NetBSD-specific boot loader
                    311:         * booted this kernel.  The stack carries the following parameters:
1.41      jmmv      312:         * (boothowto, [bootdev], bootinfo, esym, biosextmem, biosbasemem),
1.38      jmmv      313:         * 4 bytes each.
1.1       fvdl      314:         */
1.38      jmmv      315:        addl    $4,%esp         # Discard return address to boot loader
                    316:        call    _C_LABEL(native_loader)
                    317:        addl    $24,%esp
1.1       fvdl      318:
                    319: 2:
                    320:        /* First, reset the PSL. */
                    321:        pushl   $PSL_MBO
                    322:        popfl
                    323:
                    324:        /* Clear segment registers; always null in proc0. */
                    325:        xorl    %eax,%eax
                    326:        movw    %ax,%fs
                    327:        movw    %ax,%gs
                    328:        decl    %eax
1.73      ad        329:        movl    %eax,RELOC(cpuid_level)
1.1       fvdl      330:
                    331:        /* Find out our CPU type. */
                    332:
                    333: try386:        /* Try to toggle alignment check flag; does not exist on 386. */
                    334:        pushfl
                    335:        popl    %eax
                    336:        movl    %eax,%ecx
                    337:        orl     $PSL_AC,%eax
                    338:        pushl   %eax
                    339:        popfl
                    340:        pushfl
                    341:        popl    %eax
                    342:        xorl    %ecx,%eax
                    343:        andl    $PSL_AC,%eax
                    344:        pushl   %ecx
                    345:        popfl
                    346:
                    347:        testl   %eax,%eax
                    348:        jnz     try486
                    349:
                    350:        /*
                    351:         * Try the test of a NexGen CPU -- ZF will not change on a DIV
                    352:         * instruction on a NexGen, it will on an i386.  Documented in
                    353:         * Nx586 Processor Recognition Application Note, NexGen, Inc.
                    354:         */
                    355:        movl    $0x5555,%eax
                    356:        xorl    %edx,%edx
                    357:        movl    $2,%ecx
                    358:        divl    %ecx
                    359:        jnz     is386
                    360:
                    361: isnx586:
                    362:        /*
                    363:         * Don't try cpuid, as Nx586s reportedly don't support the
                    364:         * PSL_ID bit.
                    365:         */
1.100     chs       366:        movl    $CPU_NX586,RELOC(cputype)
1.1       fvdl      367:        jmp     2f
                    368:
                    369: is386:
1.100     chs       370:        movl    $CPU_386,RELOC(cputype)
1.1       fvdl      371:        jmp     2f
                    372:
                    373: try486:        /* Try to toggle identification flag; does not exist on early 486s. */
                    374:        pushfl
                    375:        popl    %eax
                    376:        movl    %eax,%ecx
                    377:        xorl    $PSL_ID,%eax
                    378:        pushl   %eax
                    379:        popfl
                    380:        pushfl
                    381:        popl    %eax
                    382:        xorl    %ecx,%eax
                    383:        andl    $PSL_ID,%eax
                    384:        pushl   %ecx
                    385:        popfl
                    386:
                    387:        testl   %eax,%eax
                    388:        jnz     try586
1.100     chs       389: is486: movl    $CPU_486,RELOC(cputype)
1.1       fvdl      390:        /*
                    391:         * Check Cyrix CPU
                    392:         * Cyrix CPUs do not change the undefined flags following
                    393:         * execution of the divide instruction which divides 5 by 2.
                    394:         *
                    395:         * Note: CPUID is enabled on M2, so it passes another way.
                    396:         */
                    397:        pushfl
                    398:        movl    $0x5555, %eax
                    399:        xorl    %edx, %edx
                    400:        movl    $2, %ecx
                    401:        clc
                    402:        divl    %ecx
                    403:        jnc     trycyrix486
                    404:        popfl
                    405:        jmp 2f
                    406: trycyrix486:
1.100     chs       407:        movl    $CPU_6x86,RELOC(cputype)        # set CPU type
1.1       fvdl      408:        /*
                    409:         * Check for Cyrix 486 CPU by seeing if the flags change during a
                    410:         * divide. This is documented in the Cx486SLC/e SMM Programmer's
                    411:         * Guide.
                    412:         */
                    413:        xorl    %edx,%edx
                    414:        cmpl    %edx,%edx               # set flags to known state
                    415:        pushfl
                    416:        popl    %ecx                    # store flags in ecx
                    417:        movl    $-1,%eax
                    418:        movl    $4,%ebx
                    419:        divl    %ebx                    # do a long division
                    420:        pushfl
                    421:        popl    %eax
                    422:        xorl    %ecx,%eax               # are the flags different?
                    423:        testl   $0x8d5,%eax             # only check C|PF|AF|Z|N|V
                    424:        jne     2f                      # yes; must be Cyrix 6x86 CPU
1.100     chs       425:        movl    $CPU_486DLC,RELOC(cputype)      # set CPU type
1.1       fvdl      426:
                    427: #ifndef CYRIX_CACHE_WORKS
                    428:        /* Disable caching of the ISA hole only. */
                    429:        invd
                    430:        movb    $CCR0,%al               # Configuration Register index (CCR0)
                    431:        outb    %al,$0x22
                    432:        inb     $0x23,%al
                    433:        orb     $(CCR0_NC1|CCR0_BARB),%al
                    434:        movb    %al,%ah
                    435:        movb    $CCR0,%al
                    436:        outb    %al,$0x22
                    437:        movb    %ah,%al
                    438:        outb    %al,$0x23
                    439:        invd
                    440: #else /* CYRIX_CACHE_WORKS */
                    441:        /* Set cache parameters */
                    442:        invd                            # Start with guaranteed clean cache
                    443:        movb    $CCR0,%al               # Configuration Register index (CCR0)
                    444:        outb    %al,$0x22
                    445:        inb     $0x23,%al
                    446:        andb    $~CCR0_NC0,%al
                    447: #ifndef CYRIX_CACHE_REALLY_WORKS
                    448:        orb     $(CCR0_NC1|CCR0_BARB),%al
                    449: #else
                    450:        orb     $CCR0_NC1,%al
                    451: #endif
                    452:        movb    %al,%ah
                    453:        movb    $CCR0,%al
                    454:        outb    %al,$0x22
                    455:        movb    %ah,%al
                    456:        outb    %al,$0x23
                    457:        /* clear non-cacheable region 1 */
                    458:        movb    $(NCR1+2),%al
                    459:        outb    %al,$0x22
                    460:        movb    $NCR_SIZE_0K,%al
                    461:        outb    %al,$0x23
                    462:        /* clear non-cacheable region 2 */
                    463:        movb    $(NCR2+2),%al
                    464:        outb    %al,$0x22
                    465:        movb    $NCR_SIZE_0K,%al
                    466:        outb    %al,$0x23
                    467:        /* clear non-cacheable region 3 */
                    468:        movb    $(NCR3+2),%al
                    469:        outb    %al,$0x22
                    470:        movb    $NCR_SIZE_0K,%al
                    471:        outb    %al,$0x23
                    472:        /* clear non-cacheable region 4 */
                    473:        movb    $(NCR4+2),%al
                    474:        outb    %al,$0x22
                    475:        movb    $NCR_SIZE_0K,%al
                    476:        outb    %al,$0x23
                    477:        /* enable caching in CR0 */
                    478:        movl    %cr0,%eax
                    479:        andl    $~(CR0_CD|CR0_NW),%eax
                    480:        movl    %eax,%cr0
                    481:        invd
                    482: #endif /* CYRIX_CACHE_WORKS */
                    483:
                    484:        jmp     2f
                    485:
                    486: try586:        /* Use the `cpuid' instruction. */
                    487:        xorl    %eax,%eax
                    488:        cpuid
1.73      ad        489:        movl    %eax,RELOC(cpuid_level)
1.1       fvdl      490:
                    491: 2:
                    492:        /*
                    493:         * Finished with old stack; load new %esp now instead of later so we
                    494:         * can trace this code without having to worry about the trace trap
                    495:         * clobbering the memory test or the zeroing of the bss+bootstrap page
                    496:         * tables.
                    497:         *
                    498:         * The boot program should check:
                    499:         *      text+data <= &stack_variable - more_space_for_stack
                    500:         *      text+data+bss+pad+space_for_page_tables <= end_of_memory
                    501:         * Oops, the gdt is in the carcass of the boot program so clearing
                    502:         * the rest of memory is still not possible.
                    503:         */
                    504:        movl    $_RELOC(tmpstk),%esp    # bootstrap stack end location
                    505:
                    506: /*
1.93      jym       507:  * Virtual address space of kernel, without PAE. The page dir is 1 page long.
1.1       fvdl      508:  *
1.71      ad        509:  * text | data | bss | [syms] | [blobs] | page dir | proc0 kstack | L1 ptp
                    510:  *                                     0          1       2      3
1.93      jym       511:  *
                    512:  * Virtual address space of kernel, with PAE. We need 4 pages for the page dir
                    513:  * and 1 page for the L3.
                    514:  * text | data | bss | [syms] | [blobs] | L3 | page dir | proc0 kstack | L1 ptp
                    515:  *                                     0    1          5       6      7
1.1       fvdl      516:  */
1.93      jym       517: #ifndef PAE
                    518: #define        PROC0_PDIR_OFF  0
                    519: #else
                    520: #define PROC0_L3_OFF   0
                    521: #define PROC0_PDIR_OFF 1 * PAGE_SIZE
                    522: #endif
1.53      yamt      523:
1.93      jym       524: #define        PROC0_STK_OFF   (PROC0_PDIR_OFF + PDP_SIZE * PAGE_SIZE)
1.53      yamt      525: #define        PROC0_PTP1_OFF  (PROC0_STK_OFF + UPAGES * PAGE_SIZE)
                    526:
                    527: /*
1.93      jym       528:  * fillkpt - Fill in a kernel page table
1.53      yamt      529:  *     eax = pte (page frame | control | status)
                    530:  *     ebx = page table address
                    531:  *     ecx = number of pages to map
1.106     uebayasi  532:  *
1.93      jym       533:  * For PAE, each entry is 8 bytes long: we must set the 4 upper bytes to 0.
                    534:  * This is done by the first instruction of fillkpt. In the non-PAE case, this
                    535:  * instruction just clears the page table entry.
1.53      yamt      536:  */
                    537:
                    538: #define fillkpt        \
1.93      jym       539: 1:     movl    $0,(PDE_SIZE-4)(%ebx)   ;       /* clear bits */        \
1.106     uebayasi  540:        movl    %eax,(%ebx)             ;       /* store phys addr */   \
                    541:        addl    $PDE_SIZE,%ebx          ;       /* next pte/pde */      \
                    542:        addl    $PAGE_SIZE,%eax         ;       /* next phys page */    \
1.93      jym       543:        loop    1b                      ;
1.1       fvdl      544:
                    545:        /* Find end of kernel image. */
                    546:        movl    $RELOC(end),%edi
1.71      ad        547:
1.114   ! uebayasi  548: #if (NKSYMS || defined(DDB) || defined(MODULAR)) && !defined(makeoptions_COPY_SYMTAB)
1.1       fvdl      549:        /* Save the symbols (if loaded). */
                    550:        movl    RELOC(esym),%eax
                    551:        testl   %eax,%eax
                    552:        jz      1f
1.35      yamt      553:        subl    $KERNBASE,%eax
1.1       fvdl      554:        movl    %eax,%edi
                    555: 1:
                    556: #endif
                    557:
1.71      ad        558:        /* Skip over any modules/blobs. */
                    559:        movl    RELOC(eblob),%eax
                    560:        testl   %eax,%eax
                    561:        jz      1f
                    562:        subl    $KERNBASE,%eax
                    563:        movl    %eax,%edi
                    564: 1:
1.53      yamt      565:        /* Compute sizes */
1.71      ad        566:        movl    %edi,%esi
1.1       fvdl      567:        addl    $PGOFSET,%esi                   # page align up
                    568:        andl    $~PGOFSET,%esi
                    569:
1.53      yamt      570:        /* nkptp[1] = (esi + ~L2_FRAME) >> L2_SHIFT + 1; */
                    571:        movl    %esi,%eax
                    572:        addl    $~L2_FRAME,%eax
                    573:        shrl    $L2_SHIFT,%eax
                    574:        incl    %eax            /* one more ptp for VAs stolen by bootstrap */
                    575: 1:     movl    %eax,RELOC(nkptp)+1*4
                    576:
1.93      jym       577:        /* tablesize = (PDP_SIZE + UPAGES + nkptp) << PGSHIFT; */
                    578:        addl    $(PDP_SIZE+UPAGES),%eax
                    579: #ifdef PAE
                    580:        incl    %eax            /* one more page for the L3 PD */
                    581:        shll    $PGSHIFT+1,%eax /* PTP tables are twice larger with PAE */
                    582: #else
1.53      yamt      583:        shll    $PGSHIFT,%eax
1.93      jym       584: #endif
1.53      yamt      585:        movl    %eax,RELOC(tablesize)
                    586:
                    587:        /* ensure that nkptp covers bootstrap tables */
                    588:        addl    %esi,%eax
                    589:        addl    $~L2_FRAME,%eax
                    590:        shrl    $L2_SHIFT,%eax
                    591:        incl    %eax
                    592:        cmpl    %eax,RELOC(nkptp)+1*4
                    593:        jnz     1b
                    594:
1.105     uebayasi  595:        /* Clear tables */
                    596:        movl    %esi,%edi
1.1       fvdl      597:        xorl    %eax,%eax
                    598:        cld
1.105     uebayasi  599:        movl    RELOC(tablesize),%ecx
                    600:        shrl    $2,%ecx
1.1       fvdl      601:        rep
                    602:        stosl
                    603:
1.105     uebayasi  604:        leal    (PROC0_PTP1_OFF)(%esi), %ebx
1.1       fvdl      605:
                    606: /*
                    607:  * Build initial page tables.
                    608:  */
1.105     uebayasi  609:        /*
                    610:         * Compute &__data_start - KERNBASE. This can't be > 4G,
1.53      yamt      611:         * or we can't deal with it anyway, since we can't load it in
                    612:         * 32 bit mode. So use the bottom 32 bits.
1.105     uebayasi  613:         */
                    614:        movl    $RELOC(__data_start),%edx
1.1       fvdl      615:        andl    $~PGOFSET,%edx
1.30      junyoung  616:
1.105     uebayasi  617:        /*
                    618:         * Skip the first MB.
                    619:         */
1.1       fvdl      620:        movl    $_RELOC(KERNTEXTOFF),%eax
                    621:        movl    %eax,%ecx
1.93      jym       622:        shrl    $(PGSHIFT-2),%ecx       /* ((n >> PGSHIFT) << 2) for # pdes */
                    623: #ifdef PAE
1.105     uebayasi  624:        shll    $1,%ecx                 /* pdes are twice larger with PAE */
1.93      jym       625: #endif
1.105     uebayasi  626:        addl    %ecx,%ebx
1.1       fvdl      627:
                    628:        /* Map the kernel text read-only. */
                    629:        movl    %edx,%ecx
                    630:        subl    %eax,%ecx
                    631:        shrl    $PGSHIFT,%ecx
                    632:        orl     $(PG_V|PG_KR),%eax
                    633:        fillkpt
                    634:
                    635:        /* Map the data, BSS, and bootstrap tables read-write. */
                    636:        leal    (PG_V|PG_KW)(%edx),%eax
1.53      yamt      637:        movl    RELOC(tablesize),%ecx
1.1       fvdl      638:        addl    %esi,%ecx                               # end of tables
                    639:        subl    %edx,%ecx                               # subtract end of text
                    640:        shrl    $PGSHIFT,%ecx
                    641:        fillkpt
                    642:
1.53      yamt      643:        /* Map ISA I/O mem (later atdevbase) */
1.1       fvdl      644:        movl    $(IOM_BEGIN|PG_V|PG_KW/*|PG_N*/),%eax   # having these bits set
                    645:        movl    $(IOM_SIZE>>PGSHIFT),%ecx               # for this many pte s,
                    646:        fillkpt
                    647:
                    648: /*
                    649:  * Construct a page table directory.
                    650:  */
1.105     uebayasi  651:        /* Set up top level entries for identity mapping */
                    652:        leal    (PROC0_PDIR_OFF)(%esi),%ebx
                    653:        leal    (PROC0_PTP1_OFF)(%esi),%eax
                    654:        orl     $(PG_V|PG_KW), %eax
                    655:        movl    RELOC(nkptp)+1*4,%ecx
1.1       fvdl      656:        fillkpt
                    657:
1.105     uebayasi  658:        /* Set up top level entries for actual kernel mapping */
                    659:        leal    (PROC0_PDIR_OFF + L2_SLOT_KERNBASE*PDE_SIZE)(%esi),%ebx
                    660:        leal    (PROC0_PTP1_OFF)(%esi),%eax
                    661:        orl     $(PG_V|PG_KW), %eax
                    662:        movl    RELOC(nkptp)+1*4,%ecx
1.1       fvdl      663:        fillkpt
                    664:
                    665:        /* Install a PDE recursively mapping page directory as a page table! */
1.105     uebayasi  666:        leal    (PROC0_PDIR_OFF + PDIR_SLOT_PTE*PDE_SIZE)(%esi),%ebx
                    667:        leal    (PROC0_PDIR_OFF)(%esi),%eax
                    668:        orl     $(PG_V|PG_KW),%eax
1.93      jym       669:        movl    $PDP_SIZE,%ecx
                    670:        fillkpt
                    671:
                    672: #ifdef PAE
                    673:        /* Fill in proc0 L3 page with entries pointing to the page dirs */
                    674:        leal    (PROC0_L3_OFF)(%esi),%ebx
                    675:        leal    (PROC0_PDIR_OFF)(%esi),%eax
                    676:        orl     $(PG_V),%eax
                    677:        movl    $PDP_SIZE,%ecx
                    678:        fillkpt
                    679:
                    680:        /* Enable PAE mode */
                    681:        movl    %cr4,%eax
                    682:        orl     $CR4_PAE,%eax
                    683:        movl    %eax,%cr4
                    684: #endif
1.1       fvdl      685:
1.31      junyoung  686:        /* Save phys. addr of PDP, for libkvm. */
1.93      jym       687:        leal    (PROC0_PDIR_OFF)(%esi),%eax
                    688:        movl    %eax,RELOC(PDPpaddr)
1.1       fvdl      689:
1.93      jym       690:        /*
                    691:         * Startup checklist:
                    692:         * 1. Load %cr3 with pointer to PDIR (or L3 PD page for PAE).
                    693:         */
1.1       fvdl      694:        movl    %esi,%eax               # phys address of ptd in proc 0
                    695:        movl    %eax,%cr3               # load ptd addr into mmu
1.93      jym       696:
1.105     uebayasi  697:        /*
                    698:         * 2. Enable paging and the rest of it.
                    699:         */
1.1       fvdl      700:        movl    %cr0,%eax               # get control word
1.111     dsl       701:                                        # enable paging & NPX
                    702:        orl     $(CR0_PE|CR0_PG|CR0_NE|CR0_TS|CR0_MP|CR0_WP|CR0_AM),%eax
1.77      gmcgarry  703:        movl    %eax,%cr0               # and page NOW!
1.1       fvdl      704:
                    705:        pushl   $begin                  # jump to high mem
                    706:        ret
                    707:
                    708: begin:
1.105     uebayasi  709:        /*
                    710:         * We have arrived.
                    711:         * There's no need anymore for the identity mapping in low
                    712:         * memory, remove it.
                    713:         */
                    714:        movl    _C_LABEL(nkptp)+1*4,%ecx
                    715:        leal    (PROC0_PDIR_OFF)(%esi),%ebx     # old, phys address of PDIR
                    716:        addl    $(KERNBASE), %ebx               # new, virtual address of PDIR
1.93      jym       717: 1:     movl    $0,(PDE_SIZE-4)(%ebx)           # Upper bits (for PAE)
                    718:        movl    $0,(%ebx)
1.105     uebayasi  719:        addl    $PDE_SIZE,%ebx
1.1       fvdl      720:        loop    1b
                    721:
                    722:        /* Relocate atdevbase. */
1.53      yamt      723:        movl    $KERNBASE,%edx
                    724:        addl    _C_LABEL(tablesize),%edx
1.1       fvdl      725:        addl    %esi,%edx
                    726:        movl    %edx,_C_LABEL(atdevbase)
                    727:
                    728:        /* Set up bootstrap stack. */
1.105     uebayasi  729:        leal    (PROC0_STK_OFF+KERNBASE)(%esi),%eax
1.91      rmind     730:        movl    %eax,_C_LABEL(lwp0uarea)
1.112     dsl       731:        leal    (USPACE-FRAMESIZE)(%eax),%esp
                    732:        movl    %esi,PCB_CR3(%eax)      # pcb->pcb_cr3
1.106     uebayasi  733:        xorl    %ebp,%ebp               # mark end of frames
1.1       fvdl      734:
1.37      jmmv      735: #if defined(MULTIBOOT)
                    736:        /* It is now safe to parse the Multiboot information structure
                    737:         * we saved before from C code.  Note that we cannot delay its
                    738:         * parsing any more because initgdt (called below) needs to make
                    739:         * use of this information. */
                    740:        call    _C_LABEL(multiboot_post_reloc)
                    741: #endif
                    742:
1.1       fvdl      743:        subl    $NGDT*8, %esp           # space for temporary gdt
                    744:        pushl   %esp
                    745:        call    _C_LABEL(initgdt)
                    746:        addl    $4,%esp
1.30      junyoung  747:
1.105     uebayasi  748:        movl    _C_LABEL(tablesize),%eax
1.1       fvdl      749:        addl    %esi,%eax               # skip past stack and page tables
                    750:
1.93      jym       751: #ifdef PAE
                    752:        pushl   $0      # init386() expects a 64 bits paddr_t with PAE
                    753: #endif
1.1       fvdl      754:        pushl   %eax
                    755:        call    _C_LABEL(init386)       # wire 386 chip for unix operation
1.93      jym       756:        addl    $PDE_SIZE,%esp          # pop paddr_t
                    757:        addl    $NGDT*8,%esp            # pop temporary gdt
1.1       fvdl      758:
                    759: #ifdef SAFARI_FIFO_HACK
                    760:        movb    $5,%al
                    761:        movw    $0x37b,%dx
                    762:        outb    %al,%dx
                    763:        movw    $0x37f,%dx
                    764:        inb     %dx,%al
                    765:        movb    %al,%cl
                    766:
                    767:        orb     $1,%cl
                    768:
                    769:        movb    $5,%al
                    770:        movw    $0x37b,%dx
                    771:        outb    %al,%dx
                    772:        movw    $0x37f,%dx
                    773:        movb    %cl,%al
                    774:        outb    %al,%dx
                    775: #endif /* SAFARI_FIFO_HACK */
                    776:
                    777:        call    _C_LABEL(main)
1.62      bouyer    778: #else /* XEN */
                    779:        /* First, reset the PSL. */
                    780:        pushl   $PSL_MBO
                    781:        popfl
                    782:
                    783:        cld
                    784:        movl    %esp, %ebx              # save start of available space
                    785:        movl    $_RELOC(tmpstk),%esp    # bootstrap stack end location
                    786:
1.106     uebayasi  787:        /* Clear BSS. */
1.62      bouyer    788:        xorl    %eax,%eax
                    789:        movl    $RELOC(__bss_start),%edi
                    790:        movl    $RELOC(_end),%ecx
                    791:        subl    %edi,%ecx
                    792:        rep stosb
                    793:
                    794:        /* Copy the necessary stuff from start_info structure. */
1.105     uebayasi  795:        /* We need to copy shared_info early, so that sti/cli work */
1.62      bouyer    796:        movl    $RELOC(start_info_union),%edi
                    797:        movl    $128,%ecx
                    798:        rep movsl
                    799:
                    800:        /* Clear segment registers; always null in proc0. */
                    801:        xorl    %eax,%eax
                    802:        movw    %ax,%fs
                    803:        movw    %ax,%gs
                    804:        decl    %eax
1.73      ad        805:        movl    %eax,RELOC(cpuid_level)
1.62      bouyer    806:
                    807:        xorl    %eax,%eax
                    808:        cpuid
1.73      ad        809:        movl    %eax,RELOC(cpuid_level)
1.62      bouyer    810:
1.96      cherry    811:        /*
                    812:         * Use a temp page. We'll re- add it to uvm(9) once we're
                    813:         * done using it.
                    814:         */
                    815:        movl    $RELOC(tmpgdt), %eax
                    816:        pushl   %eax            # start of temporary gdt
                    817:        call    _C_LABEL(initgdt)
                    818:        addl    $4,%esp
                    819:
1.62      bouyer    820:        call    xen_pmap_bootstrap
1.92      jym       821:
1.62      bouyer    822:        /*
                    823:         * First avail returned by xen_pmap_bootstrap in %eax
                    824:         */
                    825:        movl    %eax, %esi;
1.91      rmind     826:        movl    %esi, _C_LABEL(lwp0uarea)
1.62      bouyer    827:
                    828:        /* Set up bootstrap stack. */
1.112     dsl       829:        leal    (USPACE-FRAMESIZE)(%eax),%esp
1.106     uebayasi  830:        xorl    %ebp,%ebp               # mark end of frames
1.62      bouyer    831:
                    832:        addl    $USPACE, %esi
                    833:        subl    $KERNBASE, %esi         #init386 want a physical address
1.92      jym       834:
                    835: #ifdef PAE
                    836:        pushl   $0      # init386() expects a 64 bits paddr_t with PAE
                    837: #endif
1.62      bouyer    838:        pushl   %esi
                    839:        call    _C_LABEL(init386)       # wire 386 chip for unix operation
1.93      jym       840:        addl    $PDE_SIZE,%esp          # pop paddr_t
1.62      bouyer    841:        call    _C_LABEL(main)
1.106     uebayasi  842: #endif /* XEN */
1.104     uebayasi  843: END(start)
1.62      bouyer    844:
1.101     jym       845: #if defined(XEN)
1.62      bouyer    846: /* space for the hypercall call page */
                    847: #define HYPERCALL_PAGE_OFFSET 0x1000
                    848: .org HYPERCALL_PAGE_OFFSET
                    849: ENTRY(hypercall_page)
                    850: .skip 0x1000
1.104     uebayasi  851: END(hypercall_page)
1.62      bouyer    852:
                    853: /*
                    854:  * void lgdt_finish(void);
                    855:  * Finish load a new GDT pointer (do any necessary cleanup).
                    856:  * XXX It's somewhat questionable whether reloading all the segment registers
                    857:  * is necessary, since the actual descriptor data is not changed except by
                    858:  * process creation and exit, both of which clean up via task switches.  OTOH,
                    859:  * this only happens at run time when the GDT is resized.
                    860:  */
                    861: /* LINTSTUB: Func: void lgdt_finish(void) */
                    862: NENTRY(lgdt_finish)
                    863:        movl    $GSEL(GDATA_SEL, SEL_KPL),%eax
                    864:        movw    %ax,%ds
                    865:        movw    %ax,%es
                    866:        movw    %ax,%gs
                    867:        movw    %ax,%ss
                    868:        movl    $GSEL(GCPU_SEL, SEL_KPL),%eax
                    869:        movw    %ax,%fs
                    870:        /* Reload code selector by doing intersegment return. */
                    871:        popl    %eax
                    872:        pushl   $GSEL(GCODE_SEL, SEL_KPL)
                    873:        pushl   %eax
                    874:        lret
1.72      yamt      875: END(lgdt_finish)
1.62      bouyer    876:
                    877: #endif /* XEN */
1.1       fvdl      878:
                    879: /*
1.48      yamt      880:  * void lwp_trampoline(void);
                    881:  *
1.1       fvdl      882:  * This is a trampoline function pushed onto the stack of a newly created
                    883:  * process in order to do some additional setup.  The trampoline is entered by
1.109     christos  884:  * cpu_switchto()ing to the process, so we abuse the callee-saved
                    885:  * registers used by cpu_switchto() to store the information about the
                    886:  * stub to call.
1.1       fvdl      887:  * NOTE: This function does not have a normal calling sequence!
                    888:  */
1.48      yamt      889: NENTRY(lwp_trampoline)
1.68      ad        890:        movl    %ebp,%edi       /* for .Lsyscall_checkast */
1.48      yamt      891:        xorl    %ebp,%ebp
1.68      ad        892:        pushl   %edi
1.48      yamt      893:        pushl   %eax
                    894:        call    _C_LABEL(lwp_startup)
                    895:        addl    $8,%esp
1.1       fvdl      896:        pushl   %ebx
                    897:        call    *%esi
                    898:        addl    $4,%esp
1.68      ad        899:        jmp     .Lsyscall_checkast
1.1       fvdl      900:        /* NOTREACHED */
1.72      yamt      901: END(lwp_trampoline)
1.1       fvdl      902:
                    903: /*
1.48      yamt      904:  * sigcode()
                    905:  *
                    906:  * Signal trampoline; copied to top of user stack.  Used only for
                    907:  * compatibility with old releases of NetBSD.
1.1       fvdl      908:  */
                    909: NENTRY(sigcode)
                    910:        /*
                    911:         * Handler has returned here as if we called it.  The sigcontext
                    912:         * is on the stack after the 3 args "we" pushed.
                    913:         */
                    914:        leal    12(%esp),%eax           # get pointer to sigcontext
                    915:        movl    %eax,4(%esp)            # put it in the argument slot
                    916:                                        # fake return address already there
1.17      christos  917:        movl    $SYS_compat_16___sigreturn14,%eax
1.1       fvdl      918:        int     $0x80                   # enter kernel with args on stack
                    919:        movl    $SYS_exit,%eax
                    920:        int     $0x80                   # exit if sigreturn fails
                    921:        .globl  _C_LABEL(esigcode)
                    922: _C_LABEL(esigcode):
1.72      yamt      923: END(sigcode)
1.1       fvdl      924:
                    925: /*
1.48      yamt      926:  * int setjmp(label_t *)
                    927:  *
                    928:  * Used primarily by DDB.
1.1       fvdl      929:  */
                    930: ENTRY(setjmp)
                    931:        movl    4(%esp),%eax
                    932:        movl    %ebx,(%eax)             # save ebx
                    933:        movl    %esp,4(%eax)            # save esp
                    934:        movl    %ebp,8(%eax)            # save ebp
                    935:        movl    %esi,12(%eax)           # save esi
                    936:        movl    %edi,16(%eax)           # save edi
                    937:        movl    (%esp),%edx             # get rta
                    938:        movl    %edx,20(%eax)           # save eip
1.48      yamt      939:        xorl    %eax,%eax               # return 0
1.1       fvdl      940:        ret
1.72      yamt      941: END(setjmp)
1.1       fvdl      942:
1.48      yamt      943: /*
                    944:  * int longjmp(label_t *)
                    945:  *
                    946:  * Used primarily by DDB.
                    947:  */
1.1       fvdl      948: ENTRY(longjmp)
                    949:        movl    4(%esp),%eax
                    950:        movl    (%eax),%ebx             # restore ebx
                    951:        movl    4(%eax),%esp            # restore esp
                    952:        movl    8(%eax),%ebp            # restore ebp
                    953:        movl    12(%eax),%esi           # restore esi
                    954:        movl    16(%eax),%edi           # restore edi
                    955:        movl    20(%eax),%edx           # get rta
                    956:        movl    %edx,(%esp)             # put in return frame
1.48      yamt      957:        movl    $1,%eax                 # return 1
1.1       fvdl      958:        ret
1.72      yamt      959: END(longjmp)
1.1       fvdl      960:
1.65      skrll     961: /*
                    962:  * void dumpsys(void)
                    963:  *
                    964:  * Mimic cpu_switchto() for postmortem debugging.
                    965:  */
1.64      skrll     966: ENTRY(dumpsys)
1.65      skrll     967:        pushl   %ebx                    # set up fake switchframe
                    968:        pushl   %esi                    #   and save context
                    969:        pushl   %edi
                    970:        movl    %esp,_C_LABEL(dumppcb)+PCB_ESP
                    971:        movl    %ebp,_C_LABEL(dumppcb)+PCB_EBP
                    972:        call    _C_LABEL(dodumpsys)     # dump!
                    973:        addl    $(3*4), %esp            # unwind switchframe
1.64      skrll     974:        ret
1.72      yamt      975: END(dumpsys)
1.64      skrll     976:
1.1       fvdl      977: /*
1.106     uebayasi  978:  * struct lwp *cpu_switchto(struct lwp *oldlwp, struct lwp *newlwp,
1.58      ad        979:  *                         bool returning)
1.30      junyoung  980:  *
1.48      yamt      981:  *     1. if (oldlwp != NULL), save its context.
                    982:  *     2. then, restore context of newlwp.
                    983:  *
                    984:  * Note that the stack frame layout is known to "struct switchframe" in
                    985:  * <machine/frame.h> and to the code in cpu_lwp_fork() which initializes
1.5       thorpej   986:  * it for a new lwp.
1.1       fvdl      987:  */
1.48      yamt      988: ENTRY(cpu_switchto)
1.1       fvdl      989:        pushl   %ebx
                    990:        pushl   %esi
                    991:        pushl   %edi
                    992:
1.70      ad        993: #if defined(DIAGNOSTIC) && !defined(XEN)
                    994:        cmpl    $IPL_SCHED,CPUVAR(ILEVEL)
                    995:        jbe     0f
1.74      christos  996:        pushl   CPUVAR(ILEVEL)
1.70      ad        997:        pushl   $.Lstr
                    998:        call    _C_LABEL(panic)
1.74      christos  999:        addl    $8,%esp
                   1000: .Lstr: .string "cpu_switchto: switching above IPL_SCHED (%d)\0"
1.70      ad       1001: 0:
                   1002: #endif
                   1003:
1.48      yamt     1004:        movl    16(%esp),%esi           # oldlwp
                   1005:        movl    20(%esp),%edi           # newlwp
1.58      ad       1006:        movl    24(%esp),%edx           # returning
1.48      yamt     1007:        testl   %esi,%esi
                   1008:        jz      1f
1.1       fvdl     1009:
1.48      yamt     1010:        /* Save old context. */
1.91      rmind    1011:        movl    L_PCB(%esi),%eax
1.48      yamt     1012:        movl    %esp,PCB_ESP(%eax)
                   1013:        movl    %ebp,PCB_EBP(%eax)
                   1014:
                   1015:        /* Switch to newlwp's stack. */
1.91      rmind    1016: 1:     movl    L_PCB(%edi),%ebx
1.48      yamt     1017:        movl    PCB_EBP(%ebx),%ebp
                   1018:        movl    PCB_ESP(%ebx),%esp
1.1       fvdl     1019:
1.61      ad       1020:        /*
                   1021:         * Set curlwp.  This must be globally visible in order to permit
                   1022:         * non-interlocked mutex release.
                   1023:         */
                   1024:        movl    %edi,%ecx
                   1025:        xchgl   %ecx,CPUVAR(CURLWP)
1.58      ad       1026:
                   1027:        /* Skip the rest if returning to a pinned LWP. */
                   1028:        testl   %edx,%edx
                   1029:        jnz     4f
                   1030:
1.62      bouyer   1031: #ifdef XEN
                   1032:        pushl   %edi
                   1033:        call    _C_LABEL(i386_switch_context)
                   1034:        addl    $4,%esp
1.97      bouyer   1035: #else /* !XEN */
1.60      yamt     1036:        /* Switch ring0 esp */
                   1037:        movl    PCB_ESP0(%ebx),%eax
                   1038:        movl    %eax,CPUVAR(ESP0)
1.97      bouyer   1039: #endif /* !XEN */
1.1       fvdl     1040:
                   1041:        /* Don't bother with the rest if switching to a system process. */
1.48      yamt     1042:        testl   $LW_SYSTEM,L_FLAG(%edi)
                   1043:        jnz     4f
1.1       fvdl     1044:
1.97      bouyer   1045: #ifndef XEN
1.54      ad       1046:        /* Restore thread-private %fs/%gs descriptors. */
1.60      yamt     1047:        movl    CPUVAR(GDT),%ecx
1.55      ad       1048:        movl    PCB_FSD(%ebx), %eax
                   1049:        movl    PCB_FSD+4(%ebx), %edx
1.54      ad       1050:        movl    %eax, (GUFS_SEL*8)(%ecx)
                   1051:        movl    %edx, (GUFS_SEL*8+4)(%ecx)
1.55      ad       1052:        movl    PCB_GSD(%ebx), %eax
                   1053:        movl    PCB_GSD+4(%ebx), %edx
1.54      ad       1054:        movl    %eax, (GUGS_SEL*8)(%ecx)
                   1055:        movl    %edx, (GUGS_SEL*8+4)(%ecx)
1.97      bouyer   1056: #endif /* !XEN */
1.54      ad       1057:
1.60      yamt     1058:        /* Switch I/O bitmap */
                   1059:        movl    PCB_IOMAP(%ebx),%eax
                   1060:        orl     %eax,%eax
1.95      joerg    1061:        jnz     .Lcopy_iobitmap
1.60      yamt     1062:        movl    $(IOMAP_INVALOFF << 16),CPUVAR(IOBASE)
                   1063: .Liobitmap_done:
                   1064:
1.56      ad       1065:        /* Is this process using RAS (restartable atomic sequences)? */
                   1066:        movl    L_PROC(%edi),%eax
                   1067:        cmpl    $0,P_RASLIST(%eax)
                   1068:        jne     5f
                   1069:
1.48      yamt     1070:        /*
1.90      rmind    1071:         * Restore cr0 (including FPU state).  Raise the IPL to IPL_HIGH.
1.48      yamt     1072:         * FPU IPIs can alter the LWP's saved cr0.  Dropping the priority
                   1073:         * is deferred until mi_switch(), when cpu_switchto() returns.
                   1074:         */
1.62      bouyer   1075: 2:
1.97      bouyer   1076: #ifdef XEN
                   1077:        pushl   %edi
                   1078:        call    _C_LABEL(i386_tls_switch)
                   1079:        addl    $4,%esp
                   1080: #else /* !XEN */
1.108     christos 1081:        movl    $IPL_HIGH,CPUVAR(ILEVEL)
                   1082:        movl    PCB_CR0(%ebx),%ecx              /* has CR0_TS clear */
1.48      yamt     1083:        movl    %cr0,%edx
1.1       fvdl     1084:
1.108     christos 1085:        /*
                   1086:         * If our floating point registers are on a different CPU,
                   1087:         * set CR0_TS so we'll trap rather than reuse bogus state.
                   1088:         */
                   1089:        cmpl    CPUVAR(FPCURLWP),%edi
                   1090:        je      3f
                   1091:        orl     $CR0_TS,%ecx
                   1092:
1.48      yamt     1093:        /* Reloading CR0 is very expensive - avoid if possible. */
1.108     christos 1094: 3:     cmpl    %edx,%ecx
1.48      yamt     1095:        je      4f
1.1       fvdl     1096:        movl    %ecx,%cr0
1.97      bouyer   1097: #endif /* !XEN */
1.1       fvdl     1098:
1.48      yamt     1099:        /* Return to the new LWP, returning 'oldlwp' in %eax. */
                   1100: 4:     movl    %esi,%eax
1.1       fvdl     1101:        popl    %edi
                   1102:        popl    %esi
                   1103:        popl    %ebx
                   1104:        ret
1.20      dsl      1105:
1.48      yamt     1106:        /* Check for restartable atomic sequences (RAS). */
                   1107: 5:     movl    L_MD_REGS(%edi),%ecx
                   1108:        pushl   TF_EIP(%ecx)
1.20      dsl      1109:        pushl   %eax
                   1110:        call    _C_LABEL(ras_lookup)
                   1111:        addl    $8,%esp
                   1112:        cmpl    $-1,%eax
1.48      yamt     1113:        je      2b
1.49      ad       1114:        movl    L_MD_REGS(%edi),%ecx
                   1115:        movl    %eax,TF_EIP(%ecx)
1.48      yamt     1116:        jmp     2b
1.1       fvdl     1117:
1.60      yamt     1118: .Lcopy_iobitmap:
                   1119:        /* Copy I/O bitmap. */
1.86      ad       1120:        incl    _C_LABEL(pmap_iobmp_evcnt)+EV_COUNT
1.60      yamt     1121:        movl    $(IOMAPSIZE/4),%ecx
                   1122:        pushl   %esi
                   1123:        pushl   %edi
                   1124:        movl    %eax,%esi               /* pcb_iomap */
                   1125:        movl    CPUVAR(SELF),%edi
                   1126:        leal    CPU_INFO_IOMAP(%edi),%edi
                   1127:        rep
                   1128:        movsl
                   1129:        popl    %edi
                   1130:        popl    %esi
                   1131:        movl    $((CPU_INFO_IOMAP - CPU_INFO_TSS) << 16),CPUVAR(IOBASE)
                   1132:        jmp     .Liobitmap_done
1.72      yamt     1133: END(cpu_switchto)
1.60      yamt     1134:
1.1       fvdl     1135: /*
                   1136:  * void savectx(struct pcb *pcb);
1.48      yamt     1137:  *
1.1       fvdl     1138:  * Update pcb, saving current processor state.
                   1139:  */
                   1140: ENTRY(savectx)
1.47      skrll    1141:        movl    4(%esp),%edx            # edx = pcb
1.1       fvdl     1142:        movl    %esp,PCB_ESP(%edx)
                   1143:        movl    %ebp,PCB_EBP(%edx)
                   1144:        ret
1.72      yamt     1145: END(savectx)
1.1       fvdl     1146:
                   1147: /*
1.48      yamt     1148:  * osyscall()
                   1149:  *
1.1       fvdl     1150:  * Old call gate entry for syscall
                   1151:  */
                   1152: IDTVEC(osyscall)
1.87      ad       1153: #ifndef XEN
                   1154:        /* XXX we are in trouble! interrupts be off here. */
1.85      ad       1155:        cli                     # must be first instruction
1.87      ad       1156: #endif
1.48      yamt     1157:        pushfl                  # set eflags in trap frame
1.1       fvdl     1158:        popl    8(%esp)
1.103     chs      1159:        orl     $PSL_I,8(%esp)  # re-enable ints on return to user
1.1       fvdl     1160:        pushl   $7              # size of instruction for restart
                   1161:        jmp     syscall1
1.72      yamt     1162: IDTVEC_END(osyscall)
1.1       fvdl     1163:
                   1164: /*
1.48      yamt     1165:  * syscall()
                   1166:  *
1.1       fvdl     1167:  * Trap gate entry for syscall
                   1168:  */
                   1169: IDTVEC(syscall)
                   1170:        pushl   $2              # size of instruction for restart
                   1171: syscall1:
                   1172:        pushl   $T_ASTFLT       # trap # for doing ASTs
                   1173:        INTRENTRY
1.85      ad       1174:        STI(%eax)
1.1       fvdl     1175: #ifdef DIAGNOSTIC
                   1176:        movl    CPUVAR(ILEVEL),%ebx
                   1177:        testl   %ebx,%ebx
                   1178:        jz      1f
                   1179:        pushl   $5f
1.84      ad       1180:        call    _C_LABEL(panic)
1.1       fvdl     1181:        addl    $4,%esp
                   1182: #ifdef DDB
                   1183:        int     $3
                   1184: #endif
1.30      junyoung 1185: 1:
1.1       fvdl     1186: #endif /* DIAGNOSTIC */
1.94      matt     1187:        addl    $1,CPUVAR(NSYSCALL)     # count it atomically
                   1188:        adcl    $0,CPUVAR(NSYSCALL)+4   # count it atomically
1.68      ad       1189:        movl    CPUVAR(CURLWP),%edi
                   1190:        movl    L_PROC(%edi),%edx
                   1191:        movl    %esp,L_MD_REGS(%edi)    # save pointer to frame
1.15      fvdl     1192:        pushl   %esp
1.1       fvdl     1193:        call    *P_MD_SYSCALL(%edx)     # get pointer to syscall() function
1.15      fvdl     1194:        addl    $4,%esp
1.27      yamt     1195: .Lsyscall_checkast:
1.24      yamt     1196:        /* Check for ASTs on exit to user mode. */
1.62      bouyer   1197:        CLI(%eax)
1.68      ad       1198:        movl    L_MD_ASTPENDING(%edi), %eax
                   1199:        orl     CPUVAR(WANT_PMAPLOAD), %eax
1.24      yamt     1200:        jnz     9f
1.62      bouyer   1201: #ifdef XEN
                   1202:        STIC(%eax)
                   1203:        jz      14f
                   1204:        call    _C_LABEL(stipending)
                   1205:        testl   %eax,%eax
                   1206:        jz      14f
                   1207:        /* process pending interrupts */
                   1208:        CLI(%eax)
                   1209:        movl    CPUVAR(ILEVEL), %ebx
                   1210:        movl    $.Lsyscall_resume, %esi # address to resume loop at
                   1211: .Lsyscall_resume:
                   1212:        movl    %ebx,%eax       # get cpl
                   1213:        movl    CPUVAR(IUNMASK)(,%eax,4),%eax
1.106     uebayasi 1214:        andl    CPUVAR(IPENDING),%eax   # any non-masked bits left?
1.62      bouyer   1215:        jz      17f
                   1216:        bsrl    %eax,%eax
                   1217:        btrl    %eax,CPUVAR(IPENDING)
                   1218:        movl    CPUVAR(ISOURCES)(,%eax,4),%eax
                   1219:        jmp     *IS_RESUME(%eax)
1.106     uebayasi 1220: 17:    movl    %ebx, CPUVAR(ILEVEL)    #restore cpl
1.62      bouyer   1221:        jmp     .Lsyscall_checkast
                   1222: 14:
                   1223: #endif /* XEN */
1.1       fvdl     1224: #ifndef DIAGNOSTIC
1.24      yamt     1225:        INTRFASTEXIT
1.1       fvdl     1226: #else /* DIAGNOSTIC */
1.24      yamt     1227:        cmpl    $IPL_NONE,CPUVAR(ILEVEL)
1.1       fvdl     1228:        jne     3f
                   1229:        INTRFASTEXIT
1.62      bouyer   1230: 3:     STI(%eax)
1.1       fvdl     1231:        pushl   $4f
1.84      ad       1232:        call    _C_LABEL(panic)
1.1       fvdl     1233:        addl    $4,%esp
1.58      ad       1234:        pushl   $IPL_NONE
                   1235:        call    _C_LABEL(spllower)
                   1236:        addl    $4,%esp
1.53      yamt     1237:        jmp     .Lsyscall_checkast
1.84      ad       1238: 4:     .asciz  "SPL NOT LOWERED ON SYSCALL EXIT\n"
                   1239: 5:     .asciz  "SPL NOT ZERO ON SYSCALL ENTRY\n"
1.1       fvdl     1240: #endif /* DIAGNOSTIC */
1.68      ad       1241: 9:
                   1242:        cmpl    $0, CPUVAR(WANT_PMAPLOAD)
                   1243:        jz      10f
                   1244:        STI(%eax)
1.24      yamt     1245:        call    _C_LABEL(pmap_load)
1.27      yamt     1246:        jmp     .Lsyscall_checkast      /* re-check ASTs */
1.68      ad       1247: 10:
                   1248:        /* Always returning to user mode here. */
                   1249:        movl    $0, L_MD_ASTPENDING(%edi)
                   1250:        STI(%eax)
                   1251:        /* Pushed T_ASTFLT into tf_trapno on entry. */
                   1252:        pushl   %esp
                   1253:        call    _C_LABEL(trap)
                   1254:        addl    $4,%esp
                   1255:        jmp     .Lsyscall_checkast      /* re-check ASTs */
1.72      yamt     1256: IDTVEC_END(syscall)
1.1       fvdl     1257:
1.81      ad       1258: IDTVEC(svr4_fasttrap)
                   1259:        pushl   $2              # size of instruction for restart
                   1260:        pushl   $T_ASTFLT       # trap # for doing ASTs
                   1261:        INTRENTRY
1.85      ad       1262:        STI(%eax)
1.81      ad       1263:        pushl   $RW_READER
                   1264:        pushl   $_C_LABEL(svr4_fasttrap_lock)
                   1265:        call    _C_LABEL(rw_enter)
                   1266:        addl    $8,%esp
                   1267:        call    *_C_LABEL(svr4_fasttrap_vec)
                   1268:        pushl   $_C_LABEL(svr4_fasttrap_lock)
                   1269:        call    _C_LABEL(rw_exit)
                   1270:        addl    $4,%esp
                   1271: 2:     /* Check for ASTs on exit to user mode. */
                   1272:        cli
                   1273:        CHECK_ASTPENDING(%eax)
                   1274:        je      1f
                   1275:        /* Always returning to user mode here. */
                   1276:        CLEAR_ASTPENDING(%eax)
                   1277:        sti
                   1278:        /* Pushed T_ASTFLT into tf_trapno on entry. */
                   1279:        pushl   %esp
                   1280:        call    _C_LABEL(trap)
                   1281:        addl    $4,%esp
                   1282:        jmp     2b
                   1283: 1:     CHECK_DEFERRED_SWITCH
                   1284:        jnz     9f
                   1285:        INTRFASTEXIT
                   1286: 9:     sti
                   1287:        call    _C_LABEL(pmap_load)
                   1288:        cli
                   1289:        jmp     2b
                   1290:
1.48      yamt     1291: /*
                   1292:  * int npx586bug1(int a, int b)
1.110     dsl      1293:  * Used when checking for the FDIV bug on first generations pentiums.
                   1294:  * Anything 120MHz or above is fine.
1.48      yamt     1295:  */
1.1       fvdl     1296: NENTRY(npx586bug1)
                   1297:        fildl   4(%esp)         # x
                   1298:        fildl   8(%esp)         # y
                   1299:        fld     %st(1)
                   1300:        fdiv    %st(1),%st      # x/y
                   1301:        fmulp   %st,%st(1)      # (x/y)*y
                   1302:        fsubrp  %st,%st(1)      # x-(x/y)*y
                   1303:        pushl   $0
                   1304:        fistpl  (%esp)
                   1305:        popl    %eax
                   1306:        ret
1.72      yamt     1307: END(npx586bug1)
1.50      ad       1308:
                   1309: /*
1.76      ad       1310:  * void sse2_idlezero_page(void *pg)
1.50      ad       1311:  *
1.76      ad       1312:  * Zero a page without polluting the cache.  Preemption must be
                   1313:  * disabled by the caller. Abort if a preemption is pending.
1.50      ad       1314:  */
1.76      ad       1315: ENTRY(sse2_idlezero_page)
1.50      ad       1316:        pushl   %ebp
                   1317:        movl    %esp,%ebp
                   1318:        movl    8(%esp), %edx
1.76      ad       1319:        movl    $(PAGE_SIZE/32), %ecx
1.50      ad       1320:        xorl    %eax, %eax
                   1321:        .align  16
                   1322: 1:
1.82      ad       1323:        testl   $RESCHED_KPREEMPT, CPUVAR(RESCHED)
1.76      ad       1324:        jnz     2f
1.50      ad       1325:        movnti  %eax, 0(%edx)
                   1326:        movnti  %eax, 4(%edx)
                   1327:        movnti  %eax, 8(%edx)
                   1328:        movnti  %eax, 12(%edx)
                   1329:        movnti  %eax, 16(%edx)
                   1330:        movnti  %eax, 20(%edx)
                   1331:        movnti  %eax, 24(%edx)
                   1332:        movnti  %eax, 28(%edx)
1.76      ad       1333:        addl    $32, %edx
1.75      ad       1334:        decl    %ecx
1.50      ad       1335:        jnz     1b
                   1336:        sfence
1.76      ad       1337:        incl    %eax
1.50      ad       1338:        pop     %ebp
                   1339:        ret
1.76      ad       1340: 2:
1.50      ad       1341:        sfence
                   1342:        popl    %ebp
                   1343:        ret
1.76      ad       1344: END(sse2_idlezero_page)

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