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Annotation of src/sys/arch/i386/i386/locore.S, Revision 1.112.10.1

1.112.10.1! snj         1: /*     $NetBSD: locore.S,v 1.112 2014/02/20 18:19:10 dsl 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:  *
                     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>
1.112.10.1! snj       132: __KERNEL_RCSID(0, "$NetBSD: locore.S,v 1.112 2014/02/20 18:19:10 dsl Exp $");
1.59      lukem     133:
1.18      christos  134: #include "opt_compat_oldboot.h"
1.1       fvdl      135: #include "opt_ddb.h"
1.83      apb       136: #include "opt_modular.h"
1.78      joerg     137: #include "opt_multiboot.h"
1.1       fvdl      138: #include "opt_realmem.h"
1.18      christos  139: #include "opt_vm86.h"
1.62      bouyer    140: #include "opt_xen.h"
1.1       fvdl      141:
                    142: #include "assym.h"
                    143: #include "lapic.h"
                    144: #include "ioapic.h"
1.8       fvdl      145: #include "ksyms.h"
1.1       fvdl      146:
                    147: #include <sys/errno.h>
                    148: #include <sys/syscall.h>
                    149:
                    150: #include <machine/cputypes.h>
                    151: #include <machine/segments.h>
                    152: #include <machine/specialreg.h>
                    153: #include <machine/trap.h>
                    154: #include <machine/i82489reg.h>
1.48      yamt      155: #include <machine/frameasm.h>
                    156: #include <machine/i82489reg.h>
1.62      bouyer    157: #ifndef XEN
                    158: #include <machine/multiboot.h>
                    159: #endif
1.1       fvdl      160:
                    161: /* XXX temporary kluge; these should not be here */
                    162: /* Get definitions for IOM_BEGIN, IOM_END, and IOM_SIZE */
                    163: #include <dev/isa/isareg.h>
                    164:
1.104     uebayasi  165: #ifndef XEN
                    166: #define        _RELOC(x)       ((x) - KERNBASE)
                    167: #else
                    168: #define        _RELOC(x)       ((x))
                    169: #endif /* XEN */
                    170: #define        RELOC(x)        _RELOC(_C_LABEL(x))
                    171:
1.62      bouyer    172: #ifdef XEN
                    173: /*
                    174:  * Xen guest identifier and loader selection
                    175:  */
                    176: .section __xen_guest
                    177:        .ascii  "GUEST_OS=netbsd,GUEST_VER=3.0,XEN_VER=xen-3.0"
1.106     uebayasi  178:        .ascii  ",VIRT_BASE=0xc0000000" /* KERNBASE */
                    179:        .ascii  ",ELF_PADDR_OFFSET=0xc0000000" /* KERNBASE */
                    180:        .ascii  ",VIRT_ENTRY=0xc0100000" /* KERNTEXTOFF */
                    181:        .ascii  ",HYPERCALL_PAGE=0x00000101"
1.62      bouyer    182:                /* (???+HYPERCALL_PAGE_OFFSET)/PAGE_SIZE) */
1.66      bouyer    183: #ifdef PAE
1.106     uebayasi  184:        .ascii  ",PAE=yes[extended-cr3]"
1.66      bouyer    185: #endif
1.62      bouyer    186:        .ascii  ",LOADER=generic"
1.80      ad        187: #if (NKSYMS || defined(DDB) || defined(MODULAR)) && !defined(SYMTAB_SPACE)
1.62      bouyer    188:        .ascii  ",BSD_SYMTAB=yes"
                    189: #endif
                    190:        .byte   0
1.106     uebayasi  191: #endif /* XEN */
1.62      bouyer    192:
1.1       fvdl      193: /*
                    194:  * Initialization
                    195:  */
                    196:        .data
                    197:
1.100     chs       198:        .globl  _C_LABEL(cputype)
1.73      ad        199:        .globl  _C_LABEL(cpuid_level)
1.38      jmmv      200:        .globl  _C_LABEL(esym)
1.71      ad        201:        .globl  _C_LABEL(eblob)
1.38      jmmv      202:        .globl  _C_LABEL(atdevbase)
1.104     uebayasi  203:        .globl  _C_LABEL(lwp0uarea)
                    204:        .globl  _C_LABEL(PDPpaddr)
1.1       fvdl      205:        .globl  _C_LABEL(gdt)
                    206:        .globl  _C_LABEL(idt)
1.30      junyoung  207:        .globl  _C_LABEL(lapic_tpr)
                    208:
1.1       fvdl      209: #if NLAPIC > 0
                    210: #ifdef __ELF__
1.7       thorpej   211:        .align  PAGE_SIZE
1.1       fvdl      212: #else
                    213:        .align  12
                    214: #endif
                    215:        .globl _C_LABEL(local_apic), _C_LABEL(lapic_id)
1.104     uebayasi  216:        .type   _C_LABEL(local_apic), @object
                    217: LABEL(local_apic)
1.1       fvdl      218:        .space  LAPIC_ID
1.104     uebayasi  219: END(local_apic)
                    220:        .type   _C_LABEL(lapic_id), @object
                    221: LABEL(lapic_id)
1.1       fvdl      222:        .long   0x00000000
1.106     uebayasi  223:        .space  LAPIC_TPRI-(LAPIC_ID+4)
1.104     uebayasi  224: END(lapic_id)
                    225:        .type   _C_LABEL(lapic_tpr), @object
                    226: LABEL(lapic_tpr)
1.106     uebayasi  227:        .space  LAPIC_PPRI-LAPIC_TPRI
1.104     uebayasi  228: END(lapic_tpr)
                    229:        .type   _C_LABEL(lapic_ppr), @object
1.30      junyoung  230: _C_LABEL(lapic_ppr):
1.1       fvdl      231:        .space  LAPIC_ISR-LAPIC_PPRI
1.104     uebayasi  232: END(lapic_ppr)
                    233:        .type   _C_LABEL(lapic_isr), @object
1.1       fvdl      234: _C_LABEL(lapic_isr):
1.7       thorpej   235:        .space  PAGE_SIZE-LAPIC_ISR
1.104     uebayasi  236: END(lapic_isr)
1.1       fvdl      237: #else
1.104     uebayasi  238:        .type   _C_LABEL(lapic_tpr), @object
                    239: LABEL(lapic_tpr)
1.1       fvdl      240:        .long 0
1.104     uebayasi  241: END(lapic_tpr)
1.1       fvdl      242: #endif
1.104     uebayasi  243:        .type   _C_LABEL(cputype), @object
                    244: LABEL(cputype)         .long   0       # are we 80486, Pentium, or..
                    245: END(cputype)
                    246:        .type   _C_LABEL(cpuid_level), @object
                    247: LABEL(cpuid_level)     .long   0
                    248: END(cpuid_level)
                    249:        .type   _C_LABEL(atdevbase), @object
                    250: LABEL(atdevbase)       .long   0       # location of start of iomem in virtual
                    251: END(atdevbase)
                    252:        .type   _C_LABEL(lwp0uarea), @object
                    253: LABEL(lwp0uarea)       .long   0
                    254: END(lwp0uarea)
                    255:        .type   _C_LABEL(PDPpaddr), @object
                    256: LABEL(PDPpaddr)                .long   0       # paddr of PDP, for libkvm
                    257: END(PDPpaddr)
                    258:        .type   _C_LABEL(tablesize), @object
1.53      yamt      259: _C_LABEL(tablesize):   .long   0
1.104     uebayasi  260: END(tablesize)
                    261:        .size   tmpstk, tmpstk - .
1.63      bouyer    262:        .space 512
1.1       fvdl      263: tmpstk:
1.96      cherry    264: #ifdef XEN
                    265:        .align          PAGE_SIZE, 0x0  # Align on page boundary
1.104     uebayasi  266: LABEL(tmpgdt)
1.96      cherry    267:        .space          PAGE_SIZE       # Xen expects a page
1.104     uebayasi  268: END(tmpgdt)
1.96      cherry    269: #endif /* XEN */
1.1       fvdl      270:
                    271:        .text
                    272:        .globl  _C_LABEL(kernel_text)
                    273:        .set    _C_LABEL(kernel_text),KERNTEXTOFF
                    274:
1.104     uebayasi  275: ENTRY(start)
1.62      bouyer    276: #ifndef XEN
1.104     uebayasi  277:        movw    $0x1234,0x472                   # warm boot
1.37      jmmv      278: #if defined(MULTIBOOT)
                    279:        jmp     1f
                    280:
                    281:        .align  4
                    282:        .globl  Multiboot_Header
                    283: _C_LABEL(Multiboot_Header):
1.44      jmmv      284: #define MULTIBOOT_HEADER_FLAGS (MULTIBOOT_HEADER_WANT_MEMORY)
1.37      jmmv      285:        .long   MULTIBOOT_HEADER_MAGIC
                    286:        .long   MULTIBOOT_HEADER_FLAGS
                    287:        .long   -(MULTIBOOT_HEADER_MAGIC + MULTIBOOT_HEADER_FLAGS)
                    288:
                    289: 1:
                    290:        /* Check if we are being executed by a Multiboot-compliant boot
                    291:         * loader. */
                    292:        cmpl    $MULTIBOOT_INFO_MAGIC,%eax
                    293:        jne     1f
                    294:
1.43      mrg       295:        /*
                    296:         * Indeed, a multiboot-compliant boot loader executed us.  We copy
1.37      jmmv      297:         * the received Multiboot information structure into kernel's data
                    298:         * space to process it later -- after we are relocated.  It will
1.43      mrg       299:         * be safer to run complex C code than doing it at this point.
                    300:         */
1.37      jmmv      301:        pushl   %ebx            # Address of Multiboot information
                    302:        call    _C_LABEL(multiboot_pre_reloc)
                    303:        addl    $4,%esp
1.38      jmmv      304:        jmp     2f
1.37      jmmv      305: #endif
                    306:
                    307: 1:
1.1       fvdl      308:        /*
1.38      jmmv      309:         * At this point, we know that a NetBSD-specific boot loader
                    310:         * booted this kernel.  The stack carries the following parameters:
1.41      jmmv      311:         * (boothowto, [bootdev], bootinfo, esym, biosextmem, biosbasemem),
1.38      jmmv      312:         * 4 bytes each.
1.1       fvdl      313:         */
1.38      jmmv      314:        addl    $4,%esp         # Discard return address to boot loader
                    315:        call    _C_LABEL(native_loader)
                    316:        addl    $24,%esp
1.1       fvdl      317:
                    318: 2:
                    319:        /* First, reset the PSL. */
                    320:        pushl   $PSL_MBO
                    321:        popfl
                    322:
                    323:        /* Clear segment registers; always null in proc0. */
                    324:        xorl    %eax,%eax
                    325:        movw    %ax,%fs
                    326:        movw    %ax,%gs
                    327:        decl    %eax
1.73      ad        328:        movl    %eax,RELOC(cpuid_level)
1.1       fvdl      329:
                    330:        /* Find out our CPU type. */
                    331:
                    332: try386:        /* Try to toggle alignment check flag; does not exist on 386. */
                    333:        pushfl
                    334:        popl    %eax
                    335:        movl    %eax,%ecx
                    336:        orl     $PSL_AC,%eax
                    337:        pushl   %eax
                    338:        popfl
                    339:        pushfl
                    340:        popl    %eax
                    341:        xorl    %ecx,%eax
                    342:        andl    $PSL_AC,%eax
                    343:        pushl   %ecx
                    344:        popfl
                    345:
                    346:        testl   %eax,%eax
                    347:        jnz     try486
                    348:
                    349:        /*
                    350:         * Try the test of a NexGen CPU -- ZF will not change on a DIV
                    351:         * instruction on a NexGen, it will on an i386.  Documented in
                    352:         * Nx586 Processor Recognition Application Note, NexGen, Inc.
                    353:         */
                    354:        movl    $0x5555,%eax
                    355:        xorl    %edx,%edx
                    356:        movl    $2,%ecx
                    357:        divl    %ecx
                    358:        jnz     is386
                    359:
                    360: isnx586:
                    361:        /*
                    362:         * Don't try cpuid, as Nx586s reportedly don't support the
                    363:         * PSL_ID bit.
                    364:         */
1.100     chs       365:        movl    $CPU_NX586,RELOC(cputype)
1.1       fvdl      366:        jmp     2f
                    367:
                    368: is386:
1.100     chs       369:        movl    $CPU_386,RELOC(cputype)
1.1       fvdl      370:        jmp     2f
                    371:
                    372: try486:        /* Try to toggle identification flag; does not exist on early 486s. */
                    373:        pushfl
                    374:        popl    %eax
                    375:        movl    %eax,%ecx
                    376:        xorl    $PSL_ID,%eax
                    377:        pushl   %eax
                    378:        popfl
                    379:        pushfl
                    380:        popl    %eax
                    381:        xorl    %ecx,%eax
                    382:        andl    $PSL_ID,%eax
                    383:        pushl   %ecx
                    384:        popfl
                    385:
                    386:        testl   %eax,%eax
                    387:        jnz     try586
1.100     chs       388: is486: movl    $CPU_486,RELOC(cputype)
1.1       fvdl      389:        /*
                    390:         * Check Cyrix CPU
                    391:         * Cyrix CPUs do not change the undefined flags following
                    392:         * execution of the divide instruction which divides 5 by 2.
                    393:         *
                    394:         * Note: CPUID is enabled on M2, so it passes another way.
                    395:         */
                    396:        pushfl
                    397:        movl    $0x5555, %eax
                    398:        xorl    %edx, %edx
                    399:        movl    $2, %ecx
                    400:        clc
                    401:        divl    %ecx
                    402:        jnc     trycyrix486
                    403:        popfl
                    404:        jmp 2f
                    405: trycyrix486:
1.100     chs       406:        movl    $CPU_6x86,RELOC(cputype)        # set CPU type
1.1       fvdl      407:        /*
                    408:         * Check for Cyrix 486 CPU by seeing if the flags change during a
                    409:         * divide. This is documented in the Cx486SLC/e SMM Programmer's
                    410:         * Guide.
                    411:         */
                    412:        xorl    %edx,%edx
                    413:        cmpl    %edx,%edx               # set flags to known state
                    414:        pushfl
                    415:        popl    %ecx                    # store flags in ecx
                    416:        movl    $-1,%eax
                    417:        movl    $4,%ebx
                    418:        divl    %ebx                    # do a long division
                    419:        pushfl
                    420:        popl    %eax
                    421:        xorl    %ecx,%eax               # are the flags different?
                    422:        testl   $0x8d5,%eax             # only check C|PF|AF|Z|N|V
                    423:        jne     2f                      # yes; must be Cyrix 6x86 CPU
1.100     chs       424:        movl    $CPU_486DLC,RELOC(cputype)      # set CPU type
1.1       fvdl      425:
                    426: #ifndef CYRIX_CACHE_WORKS
                    427:        /* Disable caching of the ISA hole only. */
                    428:        invd
                    429:        movb    $CCR0,%al               # Configuration Register index (CCR0)
                    430:        outb    %al,$0x22
                    431:        inb     $0x23,%al
                    432:        orb     $(CCR0_NC1|CCR0_BARB),%al
                    433:        movb    %al,%ah
                    434:        movb    $CCR0,%al
                    435:        outb    %al,$0x22
                    436:        movb    %ah,%al
                    437:        outb    %al,$0x23
                    438:        invd
                    439: #else /* CYRIX_CACHE_WORKS */
                    440:        /* Set cache parameters */
                    441:        invd                            # Start with guaranteed clean cache
                    442:        movb    $CCR0,%al               # Configuration Register index (CCR0)
                    443:        outb    %al,$0x22
                    444:        inb     $0x23,%al
                    445:        andb    $~CCR0_NC0,%al
                    446: #ifndef CYRIX_CACHE_REALLY_WORKS
                    447:        orb     $(CCR0_NC1|CCR0_BARB),%al
                    448: #else
                    449:        orb     $CCR0_NC1,%al
                    450: #endif
                    451:        movb    %al,%ah
                    452:        movb    $CCR0,%al
                    453:        outb    %al,$0x22
                    454:        movb    %ah,%al
                    455:        outb    %al,$0x23
                    456:        /* clear non-cacheable region 1 */
                    457:        movb    $(NCR1+2),%al
                    458:        outb    %al,$0x22
                    459:        movb    $NCR_SIZE_0K,%al
                    460:        outb    %al,$0x23
                    461:        /* clear non-cacheable region 2 */
                    462:        movb    $(NCR2+2),%al
                    463:        outb    %al,$0x22
                    464:        movb    $NCR_SIZE_0K,%al
                    465:        outb    %al,$0x23
                    466:        /* clear non-cacheable region 3 */
                    467:        movb    $(NCR3+2),%al
                    468:        outb    %al,$0x22
                    469:        movb    $NCR_SIZE_0K,%al
                    470:        outb    %al,$0x23
                    471:        /* clear non-cacheable region 4 */
                    472:        movb    $(NCR4+2),%al
                    473:        outb    %al,$0x22
                    474:        movb    $NCR_SIZE_0K,%al
                    475:        outb    %al,$0x23
                    476:        /* enable caching in CR0 */
                    477:        movl    %cr0,%eax
                    478:        andl    $~(CR0_CD|CR0_NW),%eax
                    479:        movl    %eax,%cr0
                    480:        invd
                    481: #endif /* CYRIX_CACHE_WORKS */
                    482:
                    483:        jmp     2f
                    484:
                    485: try586:        /* Use the `cpuid' instruction. */
                    486:        xorl    %eax,%eax
                    487:        cpuid
1.73      ad        488:        movl    %eax,RELOC(cpuid_level)
1.1       fvdl      489:
                    490: 2:
                    491:        /*
                    492:         * Finished with old stack; load new %esp now instead of later so we
                    493:         * can trace this code without having to worry about the trace trap
                    494:         * clobbering the memory test or the zeroing of the bss+bootstrap page
                    495:         * tables.
                    496:         *
                    497:         * The boot program should check:
                    498:         *      text+data <= &stack_variable - more_space_for_stack
                    499:         *      text+data+bss+pad+space_for_page_tables <= end_of_memory
                    500:         * Oops, the gdt is in the carcass of the boot program so clearing
                    501:         * the rest of memory is still not possible.
                    502:         */
                    503:        movl    $_RELOC(tmpstk),%esp    # bootstrap stack end location
                    504:
                    505: /*
1.93      jym       506:  * Virtual address space of kernel, without PAE. The page dir is 1 page long.
1.1       fvdl      507:  *
1.71      ad        508:  * text | data | bss | [syms] | [blobs] | page dir | proc0 kstack | L1 ptp
                    509:  *                                     0          1       2      3
1.93      jym       510:  *
                    511:  * Virtual address space of kernel, with PAE. We need 4 pages for the page dir
                    512:  * and 1 page for the L3.
                    513:  * text | data | bss | [syms] | [blobs] | L3 | page dir | proc0 kstack | L1 ptp
                    514:  *                                     0    1          5       6      7
1.1       fvdl      515:  */
1.93      jym       516: #ifndef PAE
                    517: #define        PROC0_PDIR_OFF  0
                    518: #else
                    519: #define PROC0_L3_OFF   0
                    520: #define PROC0_PDIR_OFF 1 * PAGE_SIZE
                    521: #endif
1.53      yamt      522:
1.93      jym       523: #define        PROC0_STK_OFF   (PROC0_PDIR_OFF + PDP_SIZE * PAGE_SIZE)
1.53      yamt      524: #define        PROC0_PTP1_OFF  (PROC0_STK_OFF + UPAGES * PAGE_SIZE)
                    525:
                    526: /*
1.93      jym       527:  * fillkpt - Fill in a kernel page table
1.53      yamt      528:  *     eax = pte (page frame | control | status)
                    529:  *     ebx = page table address
                    530:  *     ecx = number of pages to map
1.106     uebayasi  531:  *
1.93      jym       532:  * For PAE, each entry is 8 bytes long: we must set the 4 upper bytes to 0.
                    533:  * This is done by the first instruction of fillkpt. In the non-PAE case, this
                    534:  * instruction just clears the page table entry.
1.53      yamt      535:  */
                    536:
                    537: #define fillkpt        \
1.93      jym       538: 1:     movl    $0,(PDE_SIZE-4)(%ebx)   ;       /* clear bits */        \
1.106     uebayasi  539:        movl    %eax,(%ebx)             ;       /* store phys addr */   \
                    540:        addl    $PDE_SIZE,%ebx          ;       /* next pte/pde */      \
                    541:        addl    $PAGE_SIZE,%eax         ;       /* next phys page */    \
1.93      jym       542:        loop    1b                      ;
1.1       fvdl      543:
                    544:        /* Find end of kernel image. */
                    545:        movl    $RELOC(end),%edi
1.71      ad        546:
1.80      ad        547: #if (NKSYMS || defined(DDB) || defined(MODULAR)) && !defined(SYMTAB_SPACE)
1.1       fvdl      548:        /* Save the symbols (if loaded). */
                    549:        movl    RELOC(esym),%eax
                    550:        testl   %eax,%eax
                    551:        jz      1f
1.35      yamt      552:        subl    $KERNBASE,%eax
1.1       fvdl      553:        movl    %eax,%edi
                    554: 1:
                    555: #endif
                    556:
1.71      ad        557:        /* Skip over any modules/blobs. */
                    558:        movl    RELOC(eblob),%eax
                    559:        testl   %eax,%eax
                    560:        jz      1f
                    561:        subl    $KERNBASE,%eax
                    562:        movl    %eax,%edi
                    563: 1:
1.53      yamt      564:        /* Compute sizes */
1.71      ad        565:        movl    %edi,%esi
1.1       fvdl      566:        addl    $PGOFSET,%esi                   # page align up
                    567:        andl    $~PGOFSET,%esi
                    568:
1.53      yamt      569:        /* nkptp[1] = (esi + ~L2_FRAME) >> L2_SHIFT + 1; */
                    570:        movl    %esi,%eax
                    571:        addl    $~L2_FRAME,%eax
                    572:        shrl    $L2_SHIFT,%eax
                    573:        incl    %eax            /* one more ptp for VAs stolen by bootstrap */
                    574: 1:     movl    %eax,RELOC(nkptp)+1*4
                    575:
1.93      jym       576:        /* tablesize = (PDP_SIZE + UPAGES + nkptp) << PGSHIFT; */
                    577:        addl    $(PDP_SIZE+UPAGES),%eax
                    578: #ifdef PAE
                    579:        incl    %eax            /* one more page for the L3 PD */
                    580:        shll    $PGSHIFT+1,%eax /* PTP tables are twice larger with PAE */
                    581: #else
1.53      yamt      582:        shll    $PGSHIFT,%eax
1.93      jym       583: #endif
1.53      yamt      584:        movl    %eax,RELOC(tablesize)
                    585:
                    586:        /* ensure that nkptp covers bootstrap tables */
                    587:        addl    %esi,%eax
                    588:        addl    $~L2_FRAME,%eax
                    589:        shrl    $L2_SHIFT,%eax
                    590:        incl    %eax
                    591:        cmpl    %eax,RELOC(nkptp)+1*4
                    592:        jnz     1b
                    593:
1.105     uebayasi  594:        /* Clear tables */
                    595:        movl    %esi,%edi
1.1       fvdl      596:        xorl    %eax,%eax
                    597:        cld
1.105     uebayasi  598:        movl    RELOC(tablesize),%ecx
                    599:        shrl    $2,%ecx
1.1       fvdl      600:        rep
                    601:        stosl
                    602:
1.105     uebayasi  603:        leal    (PROC0_PTP1_OFF)(%esi), %ebx
1.1       fvdl      604:
                    605: /*
                    606:  * Build initial page tables.
                    607:  */
1.105     uebayasi  608:        /*
                    609:         * Compute &__data_start - KERNBASE. This can't be > 4G,
1.53      yamt      610:         * or we can't deal with it anyway, since we can't load it in
                    611:         * 32 bit mode. So use the bottom 32 bits.
1.105     uebayasi  612:         */
                    613:        movl    $RELOC(__data_start),%edx
1.1       fvdl      614:        andl    $~PGOFSET,%edx
1.30      junyoung  615:
1.105     uebayasi  616:        /*
                    617:         * Skip the first MB.
                    618:         */
1.1       fvdl      619:        movl    $_RELOC(KERNTEXTOFF),%eax
                    620:        movl    %eax,%ecx
1.93      jym       621:        shrl    $(PGSHIFT-2),%ecx       /* ((n >> PGSHIFT) << 2) for # pdes */
                    622: #ifdef PAE
1.105     uebayasi  623:        shll    $1,%ecx                 /* pdes are twice larger with PAE */
1.93      jym       624: #endif
1.105     uebayasi  625:        addl    %ecx,%ebx
1.1       fvdl      626:
                    627:        /* Map the kernel text read-only. */
                    628:        movl    %edx,%ecx
                    629:        subl    %eax,%ecx
                    630:        shrl    $PGSHIFT,%ecx
                    631:        orl     $(PG_V|PG_KR),%eax
                    632:        fillkpt
                    633:
                    634:        /* Map the data, BSS, and bootstrap tables read-write. */
                    635:        leal    (PG_V|PG_KW)(%edx),%eax
1.53      yamt      636:        movl    RELOC(tablesize),%ecx
1.1       fvdl      637:        addl    %esi,%ecx                               # end of tables
                    638:        subl    %edx,%ecx                               # subtract end of text
                    639:        shrl    $PGSHIFT,%ecx
                    640:        fillkpt
                    641:
1.53      yamt      642:        /* Map ISA I/O mem (later atdevbase) */
1.1       fvdl      643:        movl    $(IOM_BEGIN|PG_V|PG_KW/*|PG_N*/),%eax   # having these bits set
                    644:        movl    $(IOM_SIZE>>PGSHIFT),%ecx               # for this many pte s,
                    645:        fillkpt
                    646:
                    647: /*
                    648:  * Construct a page table directory.
                    649:  */
1.105     uebayasi  650:        /* Set up top level entries for identity mapping */
                    651:        leal    (PROC0_PDIR_OFF)(%esi),%ebx
                    652:        leal    (PROC0_PTP1_OFF)(%esi),%eax
                    653:        orl     $(PG_V|PG_KW), %eax
                    654:        movl    RELOC(nkptp)+1*4,%ecx
1.1       fvdl      655:        fillkpt
                    656:
1.105     uebayasi  657:        /* Set up top level entries for actual kernel mapping */
                    658:        leal    (PROC0_PDIR_OFF + L2_SLOT_KERNBASE*PDE_SIZE)(%esi),%ebx
                    659:        leal    (PROC0_PTP1_OFF)(%esi),%eax
                    660:        orl     $(PG_V|PG_KW), %eax
                    661:        movl    RELOC(nkptp)+1*4,%ecx
1.1       fvdl      662:        fillkpt
                    663:
                    664:        /* Install a PDE recursively mapping page directory as a page table! */
1.105     uebayasi  665:        leal    (PROC0_PDIR_OFF + PDIR_SLOT_PTE*PDE_SIZE)(%esi),%ebx
                    666:        leal    (PROC0_PDIR_OFF)(%esi),%eax
                    667:        orl     $(PG_V|PG_KW),%eax
1.93      jym       668:        movl    $PDP_SIZE,%ecx
                    669:        fillkpt
                    670:
                    671: #ifdef PAE
                    672:        /* Fill in proc0 L3 page with entries pointing to the page dirs */
                    673:        leal    (PROC0_L3_OFF)(%esi),%ebx
                    674:        leal    (PROC0_PDIR_OFF)(%esi),%eax
                    675:        orl     $(PG_V),%eax
                    676:        movl    $PDP_SIZE,%ecx
                    677:        fillkpt
                    678:
                    679:        /* Enable PAE mode */
                    680:        movl    %cr4,%eax
                    681:        orl     $CR4_PAE,%eax
                    682:        movl    %eax,%cr4
                    683: #endif
1.1       fvdl      684:
1.31      junyoung  685:        /* Save phys. addr of PDP, for libkvm. */
1.93      jym       686:        leal    (PROC0_PDIR_OFF)(%esi),%eax
                    687:        movl    %eax,RELOC(PDPpaddr)
1.1       fvdl      688:
1.93      jym       689:        /*
                    690:         * Startup checklist:
                    691:         * 1. Load %cr3 with pointer to PDIR (or L3 PD page for PAE).
                    692:         */
1.1       fvdl      693:        movl    %esi,%eax               # phys address of ptd in proc 0
                    694:        movl    %eax,%cr3               # load ptd addr into mmu
1.93      jym       695:
1.105     uebayasi  696:        /*
                    697:         * 2. Enable paging and the rest of it.
                    698:         */
1.1       fvdl      699:        movl    %cr0,%eax               # get control word
1.111     dsl       700:                                        # enable paging & NPX
                    701:        orl     $(CR0_PE|CR0_PG|CR0_NE|CR0_TS|CR0_MP|CR0_WP|CR0_AM),%eax
1.77      gmcgarry  702:        movl    %eax,%cr0               # and page NOW!
1.1       fvdl      703:
                    704:        pushl   $begin                  # jump to high mem
                    705:        ret
                    706:
                    707: begin:
1.105     uebayasi  708:        /*
                    709:         * We have arrived.
                    710:         * There's no need anymore for the identity mapping in low
                    711:         * memory, remove it.
                    712:         */
                    713:        movl    _C_LABEL(nkptp)+1*4,%ecx
                    714:        leal    (PROC0_PDIR_OFF)(%esi),%ebx     # old, phys address of PDIR
                    715:        addl    $(KERNBASE), %ebx               # new, virtual address of PDIR
1.93      jym       716: 1:     movl    $0,(PDE_SIZE-4)(%ebx)           # Upper bits (for PAE)
                    717:        movl    $0,(%ebx)
1.105     uebayasi  718:        addl    $PDE_SIZE,%ebx
1.1       fvdl      719:        loop    1b
                    720:
                    721:        /* Relocate atdevbase. */
1.53      yamt      722:        movl    $KERNBASE,%edx
                    723:        addl    _C_LABEL(tablesize),%edx
1.1       fvdl      724:        addl    %esi,%edx
                    725:        movl    %edx,_C_LABEL(atdevbase)
                    726:
                    727:        /* Set up bootstrap stack. */
1.105     uebayasi  728:        leal    (PROC0_STK_OFF+KERNBASE)(%esi),%eax
1.91      rmind     729:        movl    %eax,_C_LABEL(lwp0uarea)
1.112     dsl       730:        leal    (USPACE-FRAMESIZE)(%eax),%esp
                    731:        movl    %esi,PCB_CR3(%eax)      # pcb->pcb_cr3
1.106     uebayasi  732:        xorl    %ebp,%ebp               # mark end of frames
1.1       fvdl      733:
1.37      jmmv      734: #if defined(MULTIBOOT)
                    735:        /* It is now safe to parse the Multiboot information structure
                    736:         * we saved before from C code.  Note that we cannot delay its
                    737:         * parsing any more because initgdt (called below) needs to make
                    738:         * use of this information. */
                    739:        call    _C_LABEL(multiboot_post_reloc)
                    740: #endif
                    741:
1.1       fvdl      742:        subl    $NGDT*8, %esp           # space for temporary gdt
                    743:        pushl   %esp
                    744:        call    _C_LABEL(initgdt)
                    745:        addl    $4,%esp
1.30      junyoung  746:
1.105     uebayasi  747:        movl    _C_LABEL(tablesize),%eax
1.1       fvdl      748:        addl    %esi,%eax               # skip past stack and page tables
                    749:
1.93      jym       750: #ifdef PAE
                    751:        pushl   $0      # init386() expects a 64 bits paddr_t with PAE
                    752: #endif
1.1       fvdl      753:        pushl   %eax
                    754:        call    _C_LABEL(init386)       # wire 386 chip for unix operation
1.93      jym       755:        addl    $PDE_SIZE,%esp          # pop paddr_t
                    756:        addl    $NGDT*8,%esp            # pop temporary gdt
1.1       fvdl      757:
                    758: #ifdef SAFARI_FIFO_HACK
                    759:        movb    $5,%al
                    760:        movw    $0x37b,%dx
                    761:        outb    %al,%dx
                    762:        movw    $0x37f,%dx
                    763:        inb     %dx,%al
                    764:        movb    %al,%cl
                    765:
                    766:        orb     $1,%cl
                    767:
                    768:        movb    $5,%al
                    769:        movw    $0x37b,%dx
                    770:        outb    %al,%dx
                    771:        movw    $0x37f,%dx
                    772:        movb    %cl,%al
                    773:        outb    %al,%dx
                    774: #endif /* SAFARI_FIFO_HACK */
                    775:
                    776:        call    _C_LABEL(main)
1.62      bouyer    777: #else /* XEN */
                    778:        /* First, reset the PSL. */
                    779:        pushl   $PSL_MBO
                    780:        popfl
                    781:
                    782:        cld
                    783:        movl    %esp, %ebx              # save start of available space
                    784:        movl    $_RELOC(tmpstk),%esp    # bootstrap stack end location
                    785:
1.106     uebayasi  786:        /* Clear BSS. */
1.62      bouyer    787:        xorl    %eax,%eax
                    788:        movl    $RELOC(__bss_start),%edi
                    789:        movl    $RELOC(_end),%ecx
                    790:        subl    %edi,%ecx
                    791:        rep stosb
                    792:
                    793:        /* Copy the necessary stuff from start_info structure. */
1.105     uebayasi  794:        /* We need to copy shared_info early, so that sti/cli work */
1.62      bouyer    795:        movl    $RELOC(start_info_union),%edi
                    796:        movl    $128,%ecx
                    797:        rep movsl
                    798:
                    799:        /* Clear segment registers; always null in proc0. */
                    800:        xorl    %eax,%eax
                    801:        movw    %ax,%fs
                    802:        movw    %ax,%gs
                    803:        decl    %eax
1.73      ad        804:        movl    %eax,RELOC(cpuid_level)
1.62      bouyer    805:
                    806:        xorl    %eax,%eax
                    807:        cpuid
1.73      ad        808:        movl    %eax,RELOC(cpuid_level)
1.62      bouyer    809:
1.96      cherry    810:        /*
                    811:         * Use a temp page. We'll re- add it to uvm(9) once we're
                    812:         * done using it.
                    813:         */
                    814:        movl    $RELOC(tmpgdt), %eax
                    815:        pushl   %eax            # start of temporary gdt
                    816:        call    _C_LABEL(initgdt)
                    817:        addl    $4,%esp
                    818:
1.62      bouyer    819:        call    xen_pmap_bootstrap
1.92      jym       820:
1.62      bouyer    821:        /*
                    822:         * First avail returned by xen_pmap_bootstrap in %eax
                    823:         */
                    824:        movl    %eax, %esi;
1.91      rmind     825:        movl    %esi, _C_LABEL(lwp0uarea)
1.62      bouyer    826:
                    827:        /* Set up bootstrap stack. */
1.112     dsl       828:        leal    (USPACE-FRAMESIZE)(%eax),%esp
1.106     uebayasi  829:        xorl    %ebp,%ebp               # mark end of frames
1.62      bouyer    830:
                    831:        addl    $USPACE, %esi
                    832:        subl    $KERNBASE, %esi         #init386 want a physical address
1.92      jym       833:
                    834: #ifdef PAE
                    835:        pushl   $0      # init386() expects a 64 bits paddr_t with PAE
                    836: #endif
1.62      bouyer    837:        pushl   %esi
                    838:        call    _C_LABEL(init386)       # wire 386 chip for unix operation
1.93      jym       839:        addl    $PDE_SIZE,%esp          # pop paddr_t
1.62      bouyer    840:        call    _C_LABEL(main)
1.106     uebayasi  841: #endif /* XEN */
1.104     uebayasi  842: END(start)
1.62      bouyer    843:
1.101     jym       844: #if defined(XEN)
1.62      bouyer    845: /* space for the hypercall call page */
                    846: #define HYPERCALL_PAGE_OFFSET 0x1000
                    847: .org HYPERCALL_PAGE_OFFSET
                    848: ENTRY(hypercall_page)
                    849: .skip 0x1000
1.104     uebayasi  850: END(hypercall_page)
1.62      bouyer    851:
                    852: /*
                    853:  * void lgdt_finish(void);
                    854:  * Finish load a new GDT pointer (do any necessary cleanup).
                    855:  * XXX It's somewhat questionable whether reloading all the segment registers
                    856:  * is necessary, since the actual descriptor data is not changed except by
                    857:  * process creation and exit, both of which clean up via task switches.  OTOH,
                    858:  * this only happens at run time when the GDT is resized.
                    859:  */
                    860: /* LINTSTUB: Func: void lgdt_finish(void) */
                    861: NENTRY(lgdt_finish)
                    862:        movl    $GSEL(GDATA_SEL, SEL_KPL),%eax
                    863:        movw    %ax,%ds
                    864:        movw    %ax,%es
                    865:        movw    %ax,%gs
                    866:        movw    %ax,%ss
                    867:        movl    $GSEL(GCPU_SEL, SEL_KPL),%eax
                    868:        movw    %ax,%fs
                    869:        /* Reload code selector by doing intersegment return. */
                    870:        popl    %eax
                    871:        pushl   $GSEL(GCODE_SEL, SEL_KPL)
                    872:        pushl   %eax
                    873:        lret
1.72      yamt      874: END(lgdt_finish)
1.62      bouyer    875:
                    876: #endif /* XEN */
1.1       fvdl      877:
                    878: /*
1.48      yamt      879:  * void lwp_trampoline(void);
                    880:  *
1.1       fvdl      881:  * This is a trampoline function pushed onto the stack of a newly created
                    882:  * process in order to do some additional setup.  The trampoline is entered by
1.109     christos  883:  * cpu_switchto()ing to the process, so we abuse the callee-saved
                    884:  * registers used by cpu_switchto() to store the information about the
                    885:  * stub to call.
1.1       fvdl      886:  * NOTE: This function does not have a normal calling sequence!
                    887:  */
1.48      yamt      888: NENTRY(lwp_trampoline)
1.68      ad        889:        movl    %ebp,%edi       /* for .Lsyscall_checkast */
1.48      yamt      890:        xorl    %ebp,%ebp
1.68      ad        891:        pushl   %edi
1.48      yamt      892:        pushl   %eax
                    893:        call    _C_LABEL(lwp_startup)
                    894:        addl    $8,%esp
1.1       fvdl      895:        pushl   %ebx
                    896:        call    *%esi
                    897:        addl    $4,%esp
1.68      ad        898:        jmp     .Lsyscall_checkast
1.1       fvdl      899:        /* NOTREACHED */
1.72      yamt      900: END(lwp_trampoline)
1.1       fvdl      901:
                    902: /*
1.48      yamt      903:  * sigcode()
                    904:  *
                    905:  * Signal trampoline; copied to top of user stack.  Used only for
                    906:  * compatibility with old releases of NetBSD.
1.1       fvdl      907:  */
                    908: NENTRY(sigcode)
                    909:        /*
                    910:         * Handler has returned here as if we called it.  The sigcontext
                    911:         * is on the stack after the 3 args "we" pushed.
                    912:         */
                    913:        leal    12(%esp),%eax           # get pointer to sigcontext
                    914:        movl    %eax,4(%esp)            # put it in the argument slot
                    915:                                        # fake return address already there
1.17      christos  916:        movl    $SYS_compat_16___sigreturn14,%eax
1.1       fvdl      917:        int     $0x80                   # enter kernel with args on stack
                    918:        movl    $SYS_exit,%eax
                    919:        int     $0x80                   # exit if sigreturn fails
                    920:        .globl  _C_LABEL(esigcode)
                    921: _C_LABEL(esigcode):
1.72      yamt      922: END(sigcode)
1.1       fvdl      923:
                    924: /*
1.48      yamt      925:  * int setjmp(label_t *)
                    926:  *
                    927:  * Used primarily by DDB.
1.1       fvdl      928:  */
                    929: ENTRY(setjmp)
                    930:        movl    4(%esp),%eax
                    931:        movl    %ebx,(%eax)             # save ebx
                    932:        movl    %esp,4(%eax)            # save esp
                    933:        movl    %ebp,8(%eax)            # save ebp
                    934:        movl    %esi,12(%eax)           # save esi
                    935:        movl    %edi,16(%eax)           # save edi
                    936:        movl    (%esp),%edx             # get rta
                    937:        movl    %edx,20(%eax)           # save eip
1.48      yamt      938:        xorl    %eax,%eax               # return 0
1.1       fvdl      939:        ret
1.72      yamt      940: END(setjmp)
1.1       fvdl      941:
1.48      yamt      942: /*
                    943:  * int longjmp(label_t *)
                    944:  *
                    945:  * Used primarily by DDB.
                    946:  */
1.1       fvdl      947: ENTRY(longjmp)
                    948:        movl    4(%esp),%eax
                    949:        movl    (%eax),%ebx             # restore ebx
                    950:        movl    4(%eax),%esp            # restore esp
                    951:        movl    8(%eax),%ebp            # restore ebp
                    952:        movl    12(%eax),%esi           # restore esi
                    953:        movl    16(%eax),%edi           # restore edi
                    954:        movl    20(%eax),%edx           # get rta
                    955:        movl    %edx,(%esp)             # put in return frame
1.48      yamt      956:        movl    $1,%eax                 # return 1
1.1       fvdl      957:        ret
1.72      yamt      958: END(longjmp)
1.1       fvdl      959:
1.65      skrll     960: /*
                    961:  * void dumpsys(void)
                    962:  *
                    963:  * Mimic cpu_switchto() for postmortem debugging.
                    964:  */
1.64      skrll     965: ENTRY(dumpsys)
1.65      skrll     966:        pushl   %ebx                    # set up fake switchframe
                    967:        pushl   %esi                    #   and save context
                    968:        pushl   %edi
                    969:        movl    %esp,_C_LABEL(dumppcb)+PCB_ESP
                    970:        movl    %ebp,_C_LABEL(dumppcb)+PCB_EBP
                    971:        call    _C_LABEL(dodumpsys)     # dump!
                    972:        addl    $(3*4), %esp            # unwind switchframe
1.64      skrll     973:        ret
1.72      yamt      974: END(dumpsys)
1.64      skrll     975:
1.1       fvdl      976: /*
1.106     uebayasi  977:  * struct lwp *cpu_switchto(struct lwp *oldlwp, struct lwp *newlwp,
1.58      ad        978:  *                         bool returning)
1.30      junyoung  979:  *
1.48      yamt      980:  *     1. if (oldlwp != NULL), save its context.
                    981:  *     2. then, restore context of newlwp.
                    982:  *
                    983:  * Note that the stack frame layout is known to "struct switchframe" in
                    984:  * <machine/frame.h> and to the code in cpu_lwp_fork() which initializes
1.5       thorpej   985:  * it for a new lwp.
1.1       fvdl      986:  */
1.48      yamt      987: ENTRY(cpu_switchto)
1.1       fvdl      988:        pushl   %ebx
                    989:        pushl   %esi
                    990:        pushl   %edi
                    991:
1.70      ad        992: #if defined(DIAGNOSTIC) && !defined(XEN)
                    993:        cmpl    $IPL_SCHED,CPUVAR(ILEVEL)
                    994:        jbe     0f
1.74      christos  995:        pushl   CPUVAR(ILEVEL)
1.70      ad        996:        pushl   $.Lstr
                    997:        call    _C_LABEL(panic)
1.74      christos  998:        addl    $8,%esp
                    999: .Lstr: .string "cpu_switchto: switching above IPL_SCHED (%d)\0"
1.70      ad       1000: 0:
                   1001: #endif
                   1002:
1.48      yamt     1003:        movl    16(%esp),%esi           # oldlwp
                   1004:        movl    20(%esp),%edi           # newlwp
1.58      ad       1005:        movl    24(%esp),%edx           # returning
1.48      yamt     1006:        testl   %esi,%esi
                   1007:        jz      1f
1.1       fvdl     1008:
1.48      yamt     1009:        /* Save old context. */
1.91      rmind    1010:        movl    L_PCB(%esi),%eax
1.48      yamt     1011:        movl    %esp,PCB_ESP(%eax)
                   1012:        movl    %ebp,PCB_EBP(%eax)
                   1013:
                   1014:        /* Switch to newlwp's stack. */
1.91      rmind    1015: 1:     movl    L_PCB(%edi),%ebx
1.48      yamt     1016:        movl    PCB_EBP(%ebx),%ebp
                   1017:        movl    PCB_ESP(%ebx),%esp
1.1       fvdl     1018:
1.61      ad       1019:        /*
                   1020:         * Set curlwp.  This must be globally visible in order to permit
                   1021:         * non-interlocked mutex release.
                   1022:         */
                   1023:        movl    %edi,%ecx
                   1024:        xchgl   %ecx,CPUVAR(CURLWP)
1.58      ad       1025:
                   1026:        /* Skip the rest if returning to a pinned LWP. */
                   1027:        testl   %edx,%edx
                   1028:        jnz     4f
                   1029:
1.62      bouyer   1030: #ifdef XEN
                   1031:        pushl   %edi
                   1032:        call    _C_LABEL(i386_switch_context)
                   1033:        addl    $4,%esp
1.97      bouyer   1034: #else /* !XEN */
1.60      yamt     1035:        /* Switch ring0 esp */
                   1036:        movl    PCB_ESP0(%ebx),%eax
                   1037:        movl    %eax,CPUVAR(ESP0)
1.97      bouyer   1038: #endif /* !XEN */
1.1       fvdl     1039:
                   1040:        /* Don't bother with the rest if switching to a system process. */
1.48      yamt     1041:        testl   $LW_SYSTEM,L_FLAG(%edi)
                   1042:        jnz     4f
1.1       fvdl     1043:
1.97      bouyer   1044: #ifndef XEN
1.54      ad       1045:        /* Restore thread-private %fs/%gs descriptors. */
1.60      yamt     1046:        movl    CPUVAR(GDT),%ecx
1.55      ad       1047:        movl    PCB_FSD(%ebx), %eax
                   1048:        movl    PCB_FSD+4(%ebx), %edx
1.54      ad       1049:        movl    %eax, (GUFS_SEL*8)(%ecx)
                   1050:        movl    %edx, (GUFS_SEL*8+4)(%ecx)
1.55      ad       1051:        movl    PCB_GSD(%ebx), %eax
                   1052:        movl    PCB_GSD+4(%ebx), %edx
1.54      ad       1053:        movl    %eax, (GUGS_SEL*8)(%ecx)
                   1054:        movl    %edx, (GUGS_SEL*8+4)(%ecx)
1.97      bouyer   1055: #endif /* !XEN */
1.54      ad       1056:
1.60      yamt     1057:        /* Switch I/O bitmap */
                   1058:        movl    PCB_IOMAP(%ebx),%eax
                   1059:        orl     %eax,%eax
1.95      joerg    1060:        jnz     .Lcopy_iobitmap
1.60      yamt     1061:        movl    $(IOMAP_INVALOFF << 16),CPUVAR(IOBASE)
                   1062: .Liobitmap_done:
                   1063:
1.56      ad       1064:        /* Is this process using RAS (restartable atomic sequences)? */
                   1065:        movl    L_PROC(%edi),%eax
                   1066:        cmpl    $0,P_RASLIST(%eax)
                   1067:        jne     5f
                   1068:
1.48      yamt     1069:        /*
1.90      rmind    1070:         * Restore cr0 (including FPU state).  Raise the IPL to IPL_HIGH.
1.48      yamt     1071:         * FPU IPIs can alter the LWP's saved cr0.  Dropping the priority
                   1072:         * is deferred until mi_switch(), when cpu_switchto() returns.
                   1073:         */
1.62      bouyer   1074: 2:
1.97      bouyer   1075: #ifdef XEN
                   1076:        pushl   %edi
                   1077:        call    _C_LABEL(i386_tls_switch)
                   1078:        addl    $4,%esp
                   1079: #else /* !XEN */
1.108     christos 1080:        movl    $IPL_HIGH,CPUVAR(ILEVEL)
                   1081:        movl    PCB_CR0(%ebx),%ecx              /* has CR0_TS clear */
1.48      yamt     1082:        movl    %cr0,%edx
1.1       fvdl     1083:
1.108     christos 1084:        /*
                   1085:         * If our floating point registers are on a different CPU,
                   1086:         * set CR0_TS so we'll trap rather than reuse bogus state.
                   1087:         */
                   1088:        cmpl    CPUVAR(FPCURLWP),%edi
                   1089:        je      3f
                   1090:        orl     $CR0_TS,%ecx
                   1091:
1.48      yamt     1092:        /* Reloading CR0 is very expensive - avoid if possible. */
1.108     christos 1093: 3:     cmpl    %edx,%ecx
1.48      yamt     1094:        je      4f
1.1       fvdl     1095:        movl    %ecx,%cr0
1.97      bouyer   1096: #endif /* !XEN */
1.1       fvdl     1097:
1.48      yamt     1098:        /* Return to the new LWP, returning 'oldlwp' in %eax. */
                   1099: 4:     movl    %esi,%eax
1.1       fvdl     1100:        popl    %edi
                   1101:        popl    %esi
                   1102:        popl    %ebx
                   1103:        ret
1.20      dsl      1104:
1.48      yamt     1105:        /* Check for restartable atomic sequences (RAS). */
                   1106: 5:     movl    L_MD_REGS(%edi),%ecx
                   1107:        pushl   TF_EIP(%ecx)
1.20      dsl      1108:        pushl   %eax
                   1109:        call    _C_LABEL(ras_lookup)
                   1110:        addl    $8,%esp
                   1111:        cmpl    $-1,%eax
1.48      yamt     1112:        je      2b
1.49      ad       1113:        movl    L_MD_REGS(%edi),%ecx
                   1114:        movl    %eax,TF_EIP(%ecx)
1.48      yamt     1115:        jmp     2b
1.1       fvdl     1116:
1.60      yamt     1117: .Lcopy_iobitmap:
                   1118:        /* Copy I/O bitmap. */
1.86      ad       1119:        incl    _C_LABEL(pmap_iobmp_evcnt)+EV_COUNT
1.60      yamt     1120:        movl    $(IOMAPSIZE/4),%ecx
                   1121:        pushl   %esi
                   1122:        pushl   %edi
                   1123:        movl    %eax,%esi               /* pcb_iomap */
                   1124:        movl    CPUVAR(SELF),%edi
                   1125:        leal    CPU_INFO_IOMAP(%edi),%edi
                   1126:        rep
                   1127:        movsl
                   1128:        popl    %edi
                   1129:        popl    %esi
                   1130:        movl    $((CPU_INFO_IOMAP - CPU_INFO_TSS) << 16),CPUVAR(IOBASE)
                   1131:        jmp     .Liobitmap_done
1.72      yamt     1132: END(cpu_switchto)
1.60      yamt     1133:
1.1       fvdl     1134: /*
                   1135:  * void savectx(struct pcb *pcb);
1.48      yamt     1136:  *
1.1       fvdl     1137:  * Update pcb, saving current processor state.
                   1138:  */
                   1139: ENTRY(savectx)
1.47      skrll    1140:        movl    4(%esp),%edx            # edx = pcb
1.1       fvdl     1141:        movl    %esp,PCB_ESP(%edx)
                   1142:        movl    %ebp,PCB_EBP(%edx)
                   1143:        ret
1.72      yamt     1144: END(savectx)
1.1       fvdl     1145:
                   1146: /*
1.48      yamt     1147:  * syscall()
                   1148:  *
1.1       fvdl     1149:  * Trap gate entry for syscall
                   1150:  */
                   1151: IDTVEC(syscall)
                   1152:        pushl   $2              # size of instruction for restart
                   1153:        pushl   $T_ASTFLT       # trap # for doing ASTs
                   1154:        INTRENTRY
1.85      ad       1155:        STI(%eax)
1.1       fvdl     1156: #ifdef DIAGNOSTIC
                   1157:        movl    CPUVAR(ILEVEL),%ebx
                   1158:        testl   %ebx,%ebx
                   1159:        jz      1f
                   1160:        pushl   $5f
1.84      ad       1161:        call    _C_LABEL(panic)
1.1       fvdl     1162:        addl    $4,%esp
                   1163: #ifdef DDB
                   1164:        int     $3
                   1165: #endif
1.30      junyoung 1166: 1:
1.1       fvdl     1167: #endif /* DIAGNOSTIC */
1.94      matt     1168:        addl    $1,CPUVAR(NSYSCALL)     # count it atomically
                   1169:        adcl    $0,CPUVAR(NSYSCALL)+4   # count it atomically
1.68      ad       1170:        movl    CPUVAR(CURLWP),%edi
                   1171:        movl    L_PROC(%edi),%edx
                   1172:        movl    %esp,L_MD_REGS(%edi)    # save pointer to frame
1.15      fvdl     1173:        pushl   %esp
1.1       fvdl     1174:        call    *P_MD_SYSCALL(%edx)     # get pointer to syscall() function
1.15      fvdl     1175:        addl    $4,%esp
1.27      yamt     1176: .Lsyscall_checkast:
1.24      yamt     1177:        /* Check for ASTs on exit to user mode. */
1.62      bouyer   1178:        CLI(%eax)
1.68      ad       1179:        movl    L_MD_ASTPENDING(%edi), %eax
                   1180:        orl     CPUVAR(WANT_PMAPLOAD), %eax
1.24      yamt     1181:        jnz     9f
1.62      bouyer   1182: #ifdef XEN
                   1183:        STIC(%eax)
                   1184:        jz      14f
                   1185:        call    _C_LABEL(stipending)
                   1186:        testl   %eax,%eax
                   1187:        jz      14f
                   1188:        /* process pending interrupts */
                   1189:        CLI(%eax)
                   1190:        movl    CPUVAR(ILEVEL), %ebx
                   1191:        movl    $.Lsyscall_resume, %esi # address to resume loop at
                   1192: .Lsyscall_resume:
                   1193:        movl    %ebx,%eax       # get cpl
                   1194:        movl    CPUVAR(IUNMASK)(,%eax,4),%eax
1.106     uebayasi 1195:        andl    CPUVAR(IPENDING),%eax   # any non-masked bits left?
1.62      bouyer   1196:        jz      17f
                   1197:        bsrl    %eax,%eax
                   1198:        btrl    %eax,CPUVAR(IPENDING)
                   1199:        movl    CPUVAR(ISOURCES)(,%eax,4),%eax
                   1200:        jmp     *IS_RESUME(%eax)
1.106     uebayasi 1201: 17:    movl    %ebx, CPUVAR(ILEVEL)    #restore cpl
1.62      bouyer   1202:        jmp     .Lsyscall_checkast
                   1203: 14:
                   1204: #endif /* XEN */
1.1       fvdl     1205: #ifndef DIAGNOSTIC
1.24      yamt     1206:        INTRFASTEXIT
1.1       fvdl     1207: #else /* DIAGNOSTIC */
1.24      yamt     1208:        cmpl    $IPL_NONE,CPUVAR(ILEVEL)
1.1       fvdl     1209:        jne     3f
                   1210:        INTRFASTEXIT
1.62      bouyer   1211: 3:     STI(%eax)
1.1       fvdl     1212:        pushl   $4f
1.84      ad       1213:        call    _C_LABEL(panic)
1.1       fvdl     1214:        addl    $4,%esp
1.58      ad       1215:        pushl   $IPL_NONE
                   1216:        call    _C_LABEL(spllower)
                   1217:        addl    $4,%esp
1.53      yamt     1218:        jmp     .Lsyscall_checkast
1.84      ad       1219: 4:     .asciz  "SPL NOT LOWERED ON SYSCALL EXIT\n"
                   1220: 5:     .asciz  "SPL NOT ZERO ON SYSCALL ENTRY\n"
1.1       fvdl     1221: #endif /* DIAGNOSTIC */
1.68      ad       1222: 9:
                   1223:        cmpl    $0, CPUVAR(WANT_PMAPLOAD)
                   1224:        jz      10f
                   1225:        STI(%eax)
1.24      yamt     1226:        call    _C_LABEL(pmap_load)
1.27      yamt     1227:        jmp     .Lsyscall_checkast      /* re-check ASTs */
1.68      ad       1228: 10:
                   1229:        /* Always returning to user mode here. */
                   1230:        movl    $0, L_MD_ASTPENDING(%edi)
                   1231:        STI(%eax)
                   1232:        /* Pushed T_ASTFLT into tf_trapno on entry. */
                   1233:        pushl   %esp
                   1234:        call    _C_LABEL(trap)
                   1235:        addl    $4,%esp
                   1236:        jmp     .Lsyscall_checkast      /* re-check ASTs */
1.72      yamt     1237: IDTVEC_END(syscall)
1.1       fvdl     1238:
1.81      ad       1239: IDTVEC(svr4_fasttrap)
                   1240:        pushl   $2              # size of instruction for restart
                   1241:        pushl   $T_ASTFLT       # trap # for doing ASTs
                   1242:        INTRENTRY
1.85      ad       1243:        STI(%eax)
1.81      ad       1244:        pushl   $RW_READER
                   1245:        pushl   $_C_LABEL(svr4_fasttrap_lock)
                   1246:        call    _C_LABEL(rw_enter)
                   1247:        addl    $8,%esp
                   1248:        call    *_C_LABEL(svr4_fasttrap_vec)
                   1249:        pushl   $_C_LABEL(svr4_fasttrap_lock)
                   1250:        call    _C_LABEL(rw_exit)
                   1251:        addl    $4,%esp
                   1252: 2:     /* Check for ASTs on exit to user mode. */
                   1253:        cli
                   1254:        CHECK_ASTPENDING(%eax)
                   1255:        je      1f
                   1256:        /* Always returning to user mode here. */
                   1257:        CLEAR_ASTPENDING(%eax)
                   1258:        sti
                   1259:        /* Pushed T_ASTFLT into tf_trapno on entry. */
                   1260:        pushl   %esp
                   1261:        call    _C_LABEL(trap)
                   1262:        addl    $4,%esp
                   1263:        jmp     2b
                   1264: 1:     CHECK_DEFERRED_SWITCH
                   1265:        jnz     9f
                   1266:        INTRFASTEXIT
                   1267: 9:     sti
                   1268:        call    _C_LABEL(pmap_load)
                   1269:        cli
                   1270:        jmp     2b
                   1271:
1.48      yamt     1272: /*
                   1273:  * int npx586bug1(int a, int b)
1.110     dsl      1274:  * Used when checking for the FDIV bug on first generations pentiums.
                   1275:  * Anything 120MHz or above is fine.
1.48      yamt     1276:  */
1.1       fvdl     1277: NENTRY(npx586bug1)
                   1278:        fildl   4(%esp)         # x
                   1279:        fildl   8(%esp)         # y
                   1280:        fld     %st(1)
                   1281:        fdiv    %st(1),%st      # x/y
                   1282:        fmulp   %st,%st(1)      # (x/y)*y
                   1283:        fsubrp  %st,%st(1)      # x-(x/y)*y
                   1284:        pushl   $0
                   1285:        fistpl  (%esp)
                   1286:        popl    %eax
                   1287:        ret
1.72      yamt     1288: END(npx586bug1)
1.50      ad       1289:
                   1290: /*
1.76      ad       1291:  * void sse2_idlezero_page(void *pg)
1.50      ad       1292:  *
1.76      ad       1293:  * Zero a page without polluting the cache.  Preemption must be
                   1294:  * disabled by the caller. Abort if a preemption is pending.
1.50      ad       1295:  */
1.76      ad       1296: ENTRY(sse2_idlezero_page)
1.50      ad       1297:        pushl   %ebp
                   1298:        movl    %esp,%ebp
                   1299:        movl    8(%esp), %edx
1.76      ad       1300:        movl    $(PAGE_SIZE/32), %ecx
1.50      ad       1301:        xorl    %eax, %eax
                   1302:        .align  16
                   1303: 1:
1.82      ad       1304:        testl   $RESCHED_KPREEMPT, CPUVAR(RESCHED)
1.76      ad       1305:        jnz     2f
1.50      ad       1306:        movnti  %eax, 0(%edx)
                   1307:        movnti  %eax, 4(%edx)
                   1308:        movnti  %eax, 8(%edx)
                   1309:        movnti  %eax, 12(%edx)
                   1310:        movnti  %eax, 16(%edx)
                   1311:        movnti  %eax, 20(%edx)
                   1312:        movnti  %eax, 24(%edx)
                   1313:        movnti  %eax, 28(%edx)
1.76      ad       1314:        addl    $32, %edx
1.75      ad       1315:        decl    %ecx
1.50      ad       1316:        jnz     1b
                   1317:        sfence
1.76      ad       1318:        incl    %eax
1.50      ad       1319:        pop     %ebp
                   1320:        ret
1.76      ad       1321: 2:
1.50      ad       1322:        sfence
                   1323:        popl    %ebp
                   1324:        ret
1.76      ad       1325: END(sse2_idlezero_page)

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