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Annotation of src/sys/arch/i386/i386/locore.S, Revision 1.68

1.68    ! ad          1: /*     $NetBSD: locore.S,v 1.67 2008/03/11 02:24:43 ad Exp $   */
1.53      yamt        2:
                      3: /*
                      4:  * Copyright-o-rama!
                      5:  */
                      6:
                      7: /*
1.62      bouyer      8:  * Copyright (c) 2006 Manuel Bouyer.
                      9:  *
                     10:  * Redistribution and use in source and binary forms, with or without
                     11:  * modification, are permitted provided that the following conditions
                     12:  * are met:
                     13:  * 1. Redistributions of source code must retain the above copyright
                     14:  *    notice, this list of conditions and the following disclaimer.
                     15:  * 2. Redistributions in binary form must reproduce the above copyright
                     16:  *    notice, this list of conditions and the following disclaimer in the
                     17:  *    documentation and/or other materials provided with the distribution.
                     18:  * 3. All advertising materials mentioning features or use of this software
                     19:  *    must display the following acknowledgement:
                     20:  *     This product includes software developed by Manuel Bouyer.
                     21:  * 4. The name of the author may not be used to endorse or promote products
                     22:  *    derived from this software without specific prior written permission.
                     23:  *
                     24:  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
                     25:  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
                     26:  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
                     27:  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
                     28:  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
                     29:  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
                     30:  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
                     31:  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
                     32:  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
                     33:  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
                     34:  *
                     35:  */
                     36:
                     37: /*
1.53      yamt       38:  * Copyright (c) 2001 Wasabi Systems, Inc.
                     39:  * All rights reserved.
                     40:  *
                     41:  * Written by Frank van der Linden for Wasabi Systems, Inc.
                     42:  *
                     43:  * Redistribution and use in source and binary forms, with or without
                     44:  * modification, are permitted provided that the following conditions
                     45:  * are met:
                     46:  * 1. Redistributions of source code must retain the above copyright
                     47:  *    notice, this list of conditions and the following disclaimer.
                     48:  * 2. Redistributions in binary form must reproduce the above copyright
                     49:  *    notice, this list of conditions and the following disclaimer in the
                     50:  *    documentation and/or other materials provided with the distribution.
                     51:  * 3. All advertising materials mentioning features or use of this software
                     52:  *    must display the following acknowledgement:
                     53:  *      This product includes software developed for the NetBSD Project by
                     54:  *      Wasabi Systems, Inc.
                     55:  * 4. The name of Wasabi Systems, Inc. may not be used to endorse
                     56:  *    or promote products derived from this software without specific prior
                     57:  *    written permission.
                     58:  *
                     59:  * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND
                     60:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
                     61:  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
                     62:  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL WASABI SYSTEMS, INC
                     63:  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
                     64:  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
                     65:  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
                     66:  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
                     67:  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
                     68:  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
                     69:  * POSSIBILITY OF SUCH DAMAGE.
                     70:  */
                     71:
1.1       fvdl       72:
                     73: /*-
1.48      yamt       74:  * Copyright (c) 1998, 2000, 2004, 2006, 2007 The NetBSD Foundation, Inc.
1.1       fvdl       75:  * All rights reserved.
                     76:  *
                     77:  * This code is derived from software contributed to The NetBSD Foundation
                     78:  * by Charles M. Hannum.
                     79:  *
                     80:  * Redistribution and use in source and binary forms, with or without
                     81:  * modification, are permitted provided that the following conditions
                     82:  * are met:
                     83:  * 1. Redistributions of source code must retain the above copyright
                     84:  *    notice, this list of conditions and the following disclaimer.
                     85:  * 2. Redistributions in binary form must reproduce the above copyright
                     86:  *    notice, this list of conditions and the following disclaimer in the
                     87:  *    documentation and/or other materials provided with the distribution.
                     88:  * 3. All advertising materials mentioning features or use of this software
                     89:  *    must display the following acknowledgement:
                     90:  *        This product includes software developed by the NetBSD
                     91:  *        Foundation, Inc. and its contributors.
                     92:  * 4. Neither the name of The NetBSD Foundation nor the names of its
                     93:  *    contributors may be used to endorse or promote products derived
                     94:  *    from this software without specific prior written permission.
                     95:  *
                     96:  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
                     97:  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
                     98:  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
                     99:  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
                    100:  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
                    101:  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
                    102:  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
                    103:  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
                    104:  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
                    105:  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
                    106:  * POSSIBILITY OF SUCH DAMAGE.
                    107:  */
                    108:
                    109: /*-
                    110:  * Copyright (c) 1990 The Regents of the University of California.
                    111:  * All rights reserved.
                    112:  *
                    113:  * This code is derived from software contributed to Berkeley by
                    114:  * William Jolitz.
                    115:  *
                    116:  * Redistribution and use in source and binary forms, with or without
                    117:  * modification, are permitted provided that the following conditions
                    118:  * are met:
                    119:  * 1. Redistributions of source code must retain the above copyright
                    120:  *    notice, this list of conditions and the following disclaimer.
                    121:  * 2. Redistributions in binary form must reproduce the above copyright
                    122:  *    notice, this list of conditions and the following disclaimer in the
                    123:  *    documentation and/or other materials provided with the distribution.
1.12      agc       124:  * 3. Neither the name of the University nor the names of its contributors
1.1       fvdl      125:  *    may be used to endorse or promote products derived from this software
                    126:  *    without specific prior written permission.
                    127:  *
                    128:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
                    129:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                    130:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                    131:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
                    132:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                    133:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                    134:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                    135:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                    136:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                    137:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                    138:  * SUCH DAMAGE.
                    139:  *
                    140:  *     @(#)locore.s    7.3 (Berkeley) 5/13/91
                    141:  */
                    142:
1.59      lukem     143: #include <machine/asm.h>
1.68    ! ad        144: __KERNEL_RCSID(0, "$NetBSD: locore.S,v 1.67 2008/03/11 02:24:43 ad Exp $");
1.59      lukem     145:
1.18      christos  146: #include "opt_compat_oldboot.h"
1.1       fvdl      147: #include "opt_ddb.h"
                    148: #include "opt_realmem.h"
1.18      christos  149: #include "opt_vm86.h"
1.62      bouyer    150: #include "opt_xen.h"
1.1       fvdl      151:
                    152: #include "npx.h"
                    153: #include "assym.h"
                    154: #include "lapic.h"
                    155: #include "ioapic.h"
1.8       fvdl      156: #include "ksyms.h"
1.1       fvdl      157:
                    158: #include <sys/errno.h>
                    159: #include <sys/syscall.h>
                    160:
                    161: #include <machine/cputypes.h>
                    162: #include <machine/segments.h>
                    163: #include <machine/specialreg.h>
                    164: #include <machine/trap.h>
                    165: #include <machine/i82489reg.h>
1.48      yamt      166: #include <machine/frameasm.h>
                    167: #include <machine/i82489reg.h>
1.62      bouyer    168: #ifndef XEN
                    169: #include <machine/multiboot.h>
                    170: #endif
1.1       fvdl      171:
                    172: /* XXX temporary kluge; these should not be here */
                    173: /* Get definitions for IOM_BEGIN, IOM_END, and IOM_SIZE */
                    174: #include <dev/isa/isareg.h>
                    175:
1.62      bouyer    176: #ifdef XEN
                    177: /*
                    178:  * Xen guest identifier and loader selection
                    179:  */
                    180: .section __xen_guest
                    181: #ifdef XEN3
                    182:        .ascii  "GUEST_OS=netbsd,GUEST_VER=3.0,XEN_VER=xen-3.0"
                    183: #if defined(DOM0OPS) || !defined(XEN_COMPAT_030001)
                    184:        .ascii  ",VIRT_BASE=0xc0000000" /* KERNBASE */
                    185:        .ascii  ",ELF_PADDR_OFFSET=0xc0000000" /* KERNBASE */
                    186: #else
                    187:        .ascii  ",VIRT_BASE=0xc0100000" /* KERNTEXTOFF */
                    188:        .ascii  ",ELF_PADDR_OFFSET=0xc0100000" /* KERNTEXTOFF */
                    189: #endif
                    190:        .ascii  ",VIRT_ENTRY=0xc0100000" /* KERNTEXTOFF */
                    191: #if !defined(XEN_COMPAT_030001)
                    192:        .ascii  ",HYPERCALL_PAGE=0x00000101"
                    193:                /* (???+HYPERCALL_PAGE_OFFSET)/PAGE_SIZE) */
                    194: #endif
1.66      bouyer    195: #ifdef PAE
                    196:        .ascii  ",PAE=yes[extended-cr3]"
                    197: #endif
1.62      bouyer    198: #else /* !XEN3 */
                    199:        .ascii  "GUEST_OS=netbsd,GUEST_VER=2.0,XEN_VER=2.0"
                    200: #endif /* XEN3 */
                    201:        .ascii  ",LOADER=generic"
                    202: #if (NKSYMS || defined(DDB) || defined(LKM)) && !defined(SYMTAB_SPACE)
                    203:        .ascii  ",BSD_SYMTAB=yes"
                    204: #endif
                    205:        .byte   0
                    206: #endif
                    207:
1.1       fvdl      208: /*
                    209:  * Initialization
                    210:  */
                    211:        .data
                    212:
                    213:        .globl  _C_LABEL(cpu)
1.38      jmmv      214:        .globl  _C_LABEL(esym)
                    215:        .globl  _C_LABEL(atdevbase)
1.40      yamt      216:        .globl  _C_LABEL(proc0uarea),_C_LABEL(PDPpaddr)
1.1       fvdl      217:        .globl  _C_LABEL(gdt)
                    218:        .globl  _C_LABEL(idt)
1.30      junyoung  219:        .globl  _C_LABEL(lapic_tpr)
                    220:
1.1       fvdl      221: #if NLAPIC > 0
                    222: #ifdef __ELF__
1.7       thorpej   223:        .align  PAGE_SIZE
1.1       fvdl      224: #else
                    225:        .align  12
                    226: #endif
                    227:        .globl _C_LABEL(local_apic), _C_LABEL(lapic_id)
                    228: _C_LABEL(local_apic):
                    229:        .space  LAPIC_ID
1.30      junyoung  230: _C_LABEL(lapic_id):
1.1       fvdl      231:        .long   0x00000000
                    232:        .space  LAPIC_TPRI-(LAPIC_ID+4)
1.30      junyoung  233: _C_LABEL(lapic_tpr):
1.1       fvdl      234:        .space  LAPIC_PPRI-LAPIC_TPRI
1.30      junyoung  235: _C_LABEL(lapic_ppr):
1.1       fvdl      236:        .space  LAPIC_ISR-LAPIC_PPRI
                    237: _C_LABEL(lapic_isr):
1.7       thorpej   238:        .space  PAGE_SIZE-LAPIC_ISR
1.1       fvdl      239: #else
1.30      junyoung  240: _C_LABEL(lapic_tpr):
1.1       fvdl      241:        .long 0
                    242: #endif
1.30      junyoung  243:
1.48      yamt      244: _C_LABEL(cpu):         .long   0       # are we 80486, Pentium, or..
1.1       fvdl      245: _C_LABEL(atdevbase):   .long   0       # location of start of iomem in virtual
1.40      yamt      246: _C_LABEL(proc0uarea):  .long   0
1.31      junyoung  247: _C_LABEL(PDPpaddr):    .long   0       # paddr of PDP, for libkvm
1.53      yamt      248: _C_LABEL(tablesize):   .long   0
1.30      junyoung  249:
1.63      bouyer    250:        .space 512
1.1       fvdl      251: tmpstk:
                    252:
1.62      bouyer    253: #ifndef XEN
1.35      yamt      254: #define        _RELOC(x)       ((x) - KERNBASE)
1.62      bouyer    255: #else
                    256: #define        _RELOC(x)       ((x))
                    257: #endif /* XEN */
1.1       fvdl      258: #define        RELOC(x)        _RELOC(_C_LABEL(x))
                    259:
                    260:        .text
                    261:        .globl  _C_LABEL(kernel_text)
                    262:        .set    _C_LABEL(kernel_text),KERNTEXTOFF
                    263:
                    264:        .globl  start
1.62      bouyer    265: #ifndef XEN
1.1       fvdl      266: start: movw    $0x1234,0x472                   # warm boot
                    267:
1.37      jmmv      268: #if defined(MULTIBOOT)
                    269:        jmp     1f
                    270:
                    271:        .align  4
                    272:        .globl  Multiboot_Header
                    273: _C_LABEL(Multiboot_Header):
1.44      jmmv      274: #define MULTIBOOT_HEADER_FLAGS (MULTIBOOT_HEADER_WANT_MEMORY)
1.37      jmmv      275:        .long   MULTIBOOT_HEADER_MAGIC
                    276:        .long   MULTIBOOT_HEADER_FLAGS
                    277:        .long   -(MULTIBOOT_HEADER_MAGIC + MULTIBOOT_HEADER_FLAGS)
                    278:
                    279: 1:
                    280:        /* Check if we are being executed by a Multiboot-compliant boot
                    281:         * loader. */
                    282:        cmpl    $MULTIBOOT_INFO_MAGIC,%eax
                    283:        jne     1f
                    284:
1.43      mrg       285:        /*
                    286:         * Indeed, a multiboot-compliant boot loader executed us.  We copy
1.37      jmmv      287:         * the received Multiboot information structure into kernel's data
                    288:         * space to process it later -- after we are relocated.  It will
1.43      mrg       289:         * be safer to run complex C code than doing it at this point.
                    290:         */
1.37      jmmv      291:        pushl   %ebx            # Address of Multiboot information
                    292:        call    _C_LABEL(multiboot_pre_reloc)
                    293:        addl    $4,%esp
1.38      jmmv      294:        jmp     2f
1.37      jmmv      295: #endif
                    296:
                    297: 1:
1.1       fvdl      298:        /*
1.38      jmmv      299:         * At this point, we know that a NetBSD-specific boot loader
                    300:         * booted this kernel.  The stack carries the following parameters:
1.41      jmmv      301:         * (boothowto, [bootdev], bootinfo, esym, biosextmem, biosbasemem),
1.38      jmmv      302:         * 4 bytes each.
1.1       fvdl      303:         */
1.38      jmmv      304:        addl    $4,%esp         # Discard return address to boot loader
                    305:        call    _C_LABEL(native_loader)
                    306:        addl    $24,%esp
1.1       fvdl      307:
                    308: 2:
                    309:        /* First, reset the PSL. */
                    310:        pushl   $PSL_MBO
                    311:        popfl
                    312:
                    313:        /* Clear segment registers; always null in proc0. */
                    314:        xorl    %eax,%eax
                    315:        movw    %ax,%fs
                    316:        movw    %ax,%gs
                    317:        decl    %eax
                    318:        movl    %eax,RELOC(cpu_info_primary)+CPU_INFO_LEVEL
                    319:
                    320:        /* Find out our CPU type. */
                    321:
                    322: try386:        /* Try to toggle alignment check flag; does not exist on 386. */
                    323:        pushfl
                    324:        popl    %eax
                    325:        movl    %eax,%ecx
                    326:        orl     $PSL_AC,%eax
                    327:        pushl   %eax
                    328:        popfl
                    329:        pushfl
                    330:        popl    %eax
                    331:        xorl    %ecx,%eax
                    332:        andl    $PSL_AC,%eax
                    333:        pushl   %ecx
                    334:        popfl
                    335:
                    336:        testl   %eax,%eax
                    337:        jnz     try486
                    338:
                    339:        /*
                    340:         * Try the test of a NexGen CPU -- ZF will not change on a DIV
                    341:         * instruction on a NexGen, it will on an i386.  Documented in
                    342:         * Nx586 Processor Recognition Application Note, NexGen, Inc.
                    343:         */
                    344:        movl    $0x5555,%eax
                    345:        xorl    %edx,%edx
                    346:        movl    $2,%ecx
                    347:        divl    %ecx
                    348:        jnz     is386
                    349:
                    350: isnx586:
                    351:        /*
                    352:         * Don't try cpuid, as Nx586s reportedly don't support the
                    353:         * PSL_ID bit.
                    354:         */
                    355:        movl    $CPU_NX586,RELOC(cpu)
                    356:        jmp     2f
                    357:
                    358: is386:
                    359:        movl    $CPU_386,RELOC(cpu)
                    360:        jmp     2f
                    361:
                    362: try486:        /* Try to toggle identification flag; does not exist on early 486s. */
                    363:        pushfl
                    364:        popl    %eax
                    365:        movl    %eax,%ecx
                    366:        xorl    $PSL_ID,%eax
                    367:        pushl   %eax
                    368:        popfl
                    369:        pushfl
                    370:        popl    %eax
                    371:        xorl    %ecx,%eax
                    372:        andl    $PSL_ID,%eax
                    373:        pushl   %ecx
                    374:        popfl
                    375:
                    376:        testl   %eax,%eax
                    377:        jnz     try586
                    378: is486: movl    $CPU_486,RELOC(cpu)
                    379:        /*
                    380:         * Check Cyrix CPU
                    381:         * Cyrix CPUs do not change the undefined flags following
                    382:         * execution of the divide instruction which divides 5 by 2.
                    383:         *
                    384:         * Note: CPUID is enabled on M2, so it passes another way.
                    385:         */
                    386:        pushfl
                    387:        movl    $0x5555, %eax
                    388:        xorl    %edx, %edx
                    389:        movl    $2, %ecx
                    390:        clc
                    391:        divl    %ecx
                    392:        jnc     trycyrix486
                    393:        popfl
                    394:        jmp 2f
                    395: trycyrix486:
                    396:        movl    $CPU_6x86,RELOC(cpu)    # set CPU type
                    397:        /*
                    398:         * Check for Cyrix 486 CPU by seeing if the flags change during a
                    399:         * divide. This is documented in the Cx486SLC/e SMM Programmer's
                    400:         * Guide.
                    401:         */
                    402:        xorl    %edx,%edx
                    403:        cmpl    %edx,%edx               # set flags to known state
                    404:        pushfl
                    405:        popl    %ecx                    # store flags in ecx
                    406:        movl    $-1,%eax
                    407:        movl    $4,%ebx
                    408:        divl    %ebx                    # do a long division
                    409:        pushfl
                    410:        popl    %eax
                    411:        xorl    %ecx,%eax               # are the flags different?
                    412:        testl   $0x8d5,%eax             # only check C|PF|AF|Z|N|V
                    413:        jne     2f                      # yes; must be Cyrix 6x86 CPU
                    414:        movl    $CPU_486DLC,RELOC(cpu)  # set CPU type
                    415:
                    416: #ifndef CYRIX_CACHE_WORKS
                    417:        /* Disable caching of the ISA hole only. */
                    418:        invd
                    419:        movb    $CCR0,%al               # Configuration Register index (CCR0)
                    420:        outb    %al,$0x22
                    421:        inb     $0x23,%al
                    422:        orb     $(CCR0_NC1|CCR0_BARB),%al
                    423:        movb    %al,%ah
                    424:        movb    $CCR0,%al
                    425:        outb    %al,$0x22
                    426:        movb    %ah,%al
                    427:        outb    %al,$0x23
                    428:        invd
                    429: #else /* CYRIX_CACHE_WORKS */
                    430:        /* Set cache parameters */
                    431:        invd                            # Start with guaranteed clean cache
                    432:        movb    $CCR0,%al               # Configuration Register index (CCR0)
                    433:        outb    %al,$0x22
                    434:        inb     $0x23,%al
                    435:        andb    $~CCR0_NC0,%al
                    436: #ifndef CYRIX_CACHE_REALLY_WORKS
                    437:        orb     $(CCR0_NC1|CCR0_BARB),%al
                    438: #else
                    439:        orb     $CCR0_NC1,%al
                    440: #endif
                    441:        movb    %al,%ah
                    442:        movb    $CCR0,%al
                    443:        outb    %al,$0x22
                    444:        movb    %ah,%al
                    445:        outb    %al,$0x23
                    446:        /* clear non-cacheable region 1 */
                    447:        movb    $(NCR1+2),%al
                    448:        outb    %al,$0x22
                    449:        movb    $NCR_SIZE_0K,%al
                    450:        outb    %al,$0x23
                    451:        /* clear non-cacheable region 2 */
                    452:        movb    $(NCR2+2),%al
                    453:        outb    %al,$0x22
                    454:        movb    $NCR_SIZE_0K,%al
                    455:        outb    %al,$0x23
                    456:        /* clear non-cacheable region 3 */
                    457:        movb    $(NCR3+2),%al
                    458:        outb    %al,$0x22
                    459:        movb    $NCR_SIZE_0K,%al
                    460:        outb    %al,$0x23
                    461:        /* clear non-cacheable region 4 */
                    462:        movb    $(NCR4+2),%al
                    463:        outb    %al,$0x22
                    464:        movb    $NCR_SIZE_0K,%al
                    465:        outb    %al,$0x23
                    466:        /* enable caching in CR0 */
                    467:        movl    %cr0,%eax
                    468:        andl    $~(CR0_CD|CR0_NW),%eax
                    469:        movl    %eax,%cr0
                    470:        invd
                    471: #endif /* CYRIX_CACHE_WORKS */
                    472:
                    473:        jmp     2f
                    474:
                    475: try586:        /* Use the `cpuid' instruction. */
                    476:        xorl    %eax,%eax
                    477:        cpuid
                    478:        movl    %eax,RELOC(cpu_info_primary)+CPU_INFO_LEVEL
                    479:
                    480: 2:
                    481:        /*
                    482:         * Finished with old stack; load new %esp now instead of later so we
                    483:         * can trace this code without having to worry about the trace trap
                    484:         * clobbering the memory test or the zeroing of the bss+bootstrap page
                    485:         * tables.
                    486:         *
                    487:         * The boot program should check:
                    488:         *      text+data <= &stack_variable - more_space_for_stack
                    489:         *      text+data+bss+pad+space_for_page_tables <= end_of_memory
                    490:         * Oops, the gdt is in the carcass of the boot program so clearing
                    491:         * the rest of memory is still not possible.
                    492:         */
                    493:        movl    $_RELOC(tmpstk),%esp    # bootstrap stack end location
                    494:
                    495: /*
                    496:  * Virtual address space of kernel:
                    497:  *
1.53      yamt      498:  * text | data | bss | [syms] | page dir | proc0 kstack | L1 ptp
1.1       fvdl      499:  *                           0          1       2      3
                    500:  */
1.53      yamt      501:
                    502: #define        PROC0_PDIR_OFF  0
                    503: #define        PROC0_STK_OFF   (PROC0_PDIR_OFF + PAGE_SIZE)
                    504: #define        PROC0_PTP1_OFF  (PROC0_STK_OFF + UPAGES * PAGE_SIZE)
                    505:
                    506: /*
                    507:  * fillkpt
                    508:  *     eax = pte (page frame | control | status)
                    509:  *     ebx = page table address
                    510:  *     ecx = number of pages to map
                    511:  */
                    512:
                    513: #define fillkpt        \
                    514: 1:     movl    %eax,(%ebx)     ;       /* store phys addr */ \
                    515:        addl    $4,%ebx         ;       /* next pte/pde */ \
                    516:        addl    $PAGE_SIZE,%eax ;       /* next phys page */ \
                    517:        loop    1b              ;  \
                    518:
1.1       fvdl      519:
                    520:        /* Find end of kernel image. */
                    521:        movl    $RELOC(end),%edi
1.8       fvdl      522: #if (NKSYMS || defined(DDB) || defined(LKM)) && !defined(SYMTAB_SPACE)
1.1       fvdl      523:        /* Save the symbols (if loaded). */
                    524:        movl    RELOC(esym),%eax
                    525:        testl   %eax,%eax
                    526:        jz      1f
1.35      yamt      527:        subl    $KERNBASE,%eax
1.1       fvdl      528:        movl    %eax,%edi
                    529: 1:
                    530: #endif
                    531:
1.53      yamt      532:        /* Compute sizes */
1.1       fvdl      533:        movl    %edi,%esi                       # edi = esym ? esym : end
                    534:        addl    $PGOFSET,%esi                   # page align up
                    535:        andl    $~PGOFSET,%esi
                    536:
1.53      yamt      537:        /* nkptp[1] = (esi + ~L2_FRAME) >> L2_SHIFT + 1; */
                    538:        movl    %esi,%eax
                    539:        addl    $~L2_FRAME,%eax
                    540:        shrl    $L2_SHIFT,%eax
                    541:        incl    %eax            /* one more ptp for VAs stolen by bootstrap */
                    542: 1:     movl    %eax,RELOC(nkptp)+1*4
                    543:
                    544:        /* tablesize = (1 + UPAGES + nkptp) << PGSHIFT; */
                    545:        addl    $(1+UPAGES),%eax
                    546:        shll    $PGSHIFT,%eax
                    547:        movl    %eax,RELOC(tablesize)
                    548:
                    549:        /* ensure that nkptp covers bootstrap tables */
                    550:        addl    %esi,%eax
                    551:        addl    $~L2_FRAME,%eax
                    552:        shrl    $L2_SHIFT,%eax
                    553:        incl    %eax
                    554:        cmpl    %eax,RELOC(nkptp)+1*4
                    555:        jnz     1b
                    556:
                    557:        /* Clear tables */
                    558:        movl    %esi,%edi
1.1       fvdl      559:        xorl    %eax,%eax
                    560:        cld
1.53      yamt      561:        movl    RELOC(tablesize),%ecx
                    562:        shrl    $2,%ecx
1.1       fvdl      563:        rep
                    564:        stosl
                    565:
1.53      yamt      566:        leal    (PROC0_PTP1_OFF)(%esi), %ebx
1.1       fvdl      567:
                    568: /*
                    569:  * Build initial page tables.
                    570:  */
1.53      yamt      571:        /*
                    572:         * Compute &__data_start - KERNBASE. This can't be > 4G,
                    573:         * or we can't deal with it anyway, since we can't load it in
                    574:         * 32 bit mode. So use the bottom 32 bits.
                    575:         */
                    576:        movl    $RELOC(__data_start),%edx
1.1       fvdl      577:        andl    $~PGOFSET,%edx
1.30      junyoung  578:
1.53      yamt      579:        /*
                    580:         * Skip the first MB.
                    581:         */
1.1       fvdl      582:        movl    $_RELOC(KERNTEXTOFF),%eax
                    583:        movl    %eax,%ecx
1.53      yamt      584:        shrl    $(PGSHIFT-2),%ecx       /* ((n >> PGSHIFT) << 2) for # pdes */
                    585:        addl    %ecx,%ebx
1.1       fvdl      586:
                    587:        /* Map the kernel text read-only. */
                    588:        movl    %edx,%ecx
                    589:        subl    %eax,%ecx
                    590:        shrl    $PGSHIFT,%ecx
                    591:        orl     $(PG_V|PG_KR),%eax
                    592:        fillkpt
                    593:
                    594:        /* Map the data, BSS, and bootstrap tables read-write. */
                    595:        leal    (PG_V|PG_KW)(%edx),%eax
1.53      yamt      596:        movl    RELOC(tablesize),%ecx
1.1       fvdl      597:        addl    %esi,%ecx                               # end of tables
                    598:        subl    %edx,%ecx                               # subtract end of text
                    599:        shrl    $PGSHIFT,%ecx
                    600:        fillkpt
                    601:
1.53      yamt      602:        /* Map ISA I/O mem (later atdevbase) */
1.1       fvdl      603:        movl    $(IOM_BEGIN|PG_V|PG_KW/*|PG_N*/),%eax   # having these bits set
                    604:        movl    $(IOM_SIZE>>PGSHIFT),%ecx               # for this many pte s,
                    605:        fillkpt
                    606:
                    607: /*
                    608:  * Construct a page table directory.
                    609:  */
1.53      yamt      610:        /* Set up top level entries for identity mapping */
                    611:        leal    (PROC0_PDIR_OFF)(%esi),%ebx
                    612:        leal    (PROC0_PTP1_OFF)(%esi),%eax
                    613:        orl     $(PG_V|PG_KW), %eax
                    614:        movl    RELOC(nkptp)+1*4,%ecx
1.1       fvdl      615:        fillkpt
                    616:
1.53      yamt      617:        /* Set up top level entries for actual kernel mapping */
                    618:        leal    (PROC0_PDIR_OFF + L2_SLOT_KERNBASE*4)(%esi),%ebx
                    619:        leal    (PROC0_PTP1_OFF)(%esi),%eax
                    620:        orl     $(PG_V|PG_KW), %eax
                    621:        movl    RELOC(nkptp)+1*4,%ecx
1.1       fvdl      622:        fillkpt
                    623:
                    624:        /* Install a PDE recursively mapping page directory as a page table! */
1.53      yamt      625:        leal    (PROC0_PDIR_OFF + PDIR_SLOT_PTE*4)(%esi),%ebx
                    626:        leal    (PROC0_PDIR_OFF)(%esi),%eax
                    627:        orl     $(PG_V|PG_KW),%eax
                    628:        movl    %eax,(%ebx)
                    629:
1.1       fvdl      630:
1.31      junyoung  631:        /* Save phys. addr of PDP, for libkvm. */
                    632:        movl    %esi,RELOC(PDPpaddr)
1.1       fvdl      633:
1.53      yamt      634:        /*
                    635:         * Startup checklist:
                    636:         * 1. Load %cr3 with pointer to PDIR.
                    637:         */
1.1       fvdl      638:        movl    %esi,%eax               # phys address of ptd in proc 0
                    639:        movl    %eax,%cr3               # load ptd addr into mmu
1.53      yamt      640:
                    641:        /*
                    642:         * 2. Enable paging and the rest of it.
                    643:         */
1.1       fvdl      644:        movl    %cr0,%eax               # get control word
                    645:                                        # enable paging & NPX emulation
                    646:        orl     $(CR0_PE|CR0_PG|CR0_NE|CR0_TS|CR0_EM|CR0_MP),%eax
                    647:        movl    %eax,%cr0               # and let's page NOW!
                    648:
                    649:        pushl   $begin                  # jump to high mem
                    650:        ret
                    651:
                    652: begin:
1.53      yamt      653:        /*
                    654:         * We have arrived.
                    655:         * There's no need anymore for the identity mapping in low
                    656:         * memory, remove it.
                    657:         */
                    658:        movl    _C_LABEL(nkptp)+1*4,%ecx
                    659:        leal    (PROC0_PDIR_OFF)(%esi),%ebx     # old, phys  address of PDIR
                    660:        addl    $(KERNBASE), %ebx       # new, virtual address of PDIR
1.1       fvdl      661: 1:     movl    $0,(%ebx)
1.53      yamt      662:        addl    $4,%ebx
1.1       fvdl      663:        loop    1b
                    664:
                    665:        /* Relocate atdevbase. */
1.53      yamt      666:        movl    $KERNBASE,%edx
                    667:        addl    _C_LABEL(tablesize),%edx
1.1       fvdl      668:        addl    %esi,%edx
                    669:        movl    %edx,_C_LABEL(atdevbase)
                    670:
                    671:        /* Set up bootstrap stack. */
1.53      yamt      672:        leal    (PROC0_STK_OFF+KERNBASE)(%esi),%eax
1.40      yamt      673:        movl    %eax,_C_LABEL(proc0uarea)
                    674:        leal    (KSTACK_SIZE-FRAMESIZE)(%eax),%esp
                    675:        movl    %esi,(KSTACK_SIZE+PCB_CR3)(%eax)        # pcb->pcb_cr3
1.1       fvdl      676:        xorl    %ebp,%ebp               # mark end of frames
                    677:
1.37      jmmv      678: #if defined(MULTIBOOT)
                    679:        /* It is now safe to parse the Multiboot information structure
                    680:         * we saved before from C code.  Note that we cannot delay its
                    681:         * parsing any more because initgdt (called below) needs to make
                    682:         * use of this information. */
                    683:        call    _C_LABEL(multiboot_post_reloc)
                    684: #endif
                    685:
1.1       fvdl      686:        subl    $NGDT*8, %esp           # space for temporary gdt
                    687:        pushl   %esp
                    688:        call    _C_LABEL(initgdt)
                    689:        addl    $4,%esp
1.30      junyoung  690:
1.53      yamt      691:        movl    _C_LABEL(tablesize),%eax
1.1       fvdl      692:        addl    %esi,%eax               # skip past stack and page tables
                    693:
                    694:        pushl   %eax
                    695:        call    _C_LABEL(init386)       # wire 386 chip for unix operation
                    696:        addl    $4+NGDT*8,%esp          # pop temporary gdt
                    697:
                    698: #ifdef SAFARI_FIFO_HACK
                    699:        movb    $5,%al
                    700:        movw    $0x37b,%dx
                    701:        outb    %al,%dx
                    702:        movw    $0x37f,%dx
                    703:        inb     %dx,%al
                    704:        movb    %al,%cl
                    705:
                    706:        orb     $1,%cl
                    707:
                    708:        movb    $5,%al
                    709:        movw    $0x37b,%dx
                    710:        outb    %al,%dx
                    711:        movw    $0x37f,%dx
                    712:        movb    %cl,%al
                    713:        outb    %al,%dx
                    714: #endif /* SAFARI_FIFO_HACK */
                    715:
                    716:        call    _C_LABEL(main)
1.62      bouyer    717: #else /* XEN */
                    718: start:
                    719:        /* First, reset the PSL. */
                    720:        pushl   $PSL_MBO
                    721:        popfl
                    722:
                    723:        cld
                    724: #ifdef XEN3
                    725:        movl    %esp, %ebx              # save start of available space
                    726: #else
                    727:        movl    %esi,%ebx               # save start_info pointer
                    728: #endif
                    729:        movl    $_RELOC(tmpstk),%esp    # bootstrap stack end location
                    730:
                    731:         /* Clear BSS first so that there are no surprises... */
                    732:        xorl    %eax,%eax
                    733:        movl    $RELOC(__bss_start),%edi
                    734:        movl    $RELOC(_end),%ecx
                    735:        subl    %edi,%ecx
                    736:        rep stosb
                    737:
                    738:        /* Copy the necessary stuff from start_info structure. */
                    739:         /* We need to copy shared_info early, so that sti/cli work */
                    740:        movl    $RELOC(start_info_union),%edi
                    741:        movl    $128,%ecx
                    742:        rep movsl
                    743:
                    744:        /* Clear segment registers; always null in proc0. */
                    745:        xorl    %eax,%eax
                    746:        movw    %ax,%fs
                    747:        movw    %ax,%gs
                    748:        decl    %eax
                    749:        movl    %eax,RELOC(cpu_info_primary)+CPU_INFO_LEVEL
                    750:
                    751:        xorl    %eax,%eax
                    752:        cpuid
                    753:        movl    %eax,RELOC(cpu_info_primary)+CPU_INFO_LEVEL
                    754:
                    755:        call    xen_pmap_bootstrap
                    756:        /*
                    757:         * First avail returned by xen_pmap_bootstrap in %eax
                    758:         */
                    759:        movl    %eax, %esi;
                    760:        movl    %esi, _C_LABEL(proc0uarea)
                    761:
                    762: #define PROC0PDIR       ((0)              * PAGE_SIZE)
                    763: #define PROC0STACK      ((1)              * PAGE_SIZE)
                    764:
                    765:        /* Set up bootstrap stack. */
                    766:        leal    (KSTACK_SIZE-FRAMESIZE)(%eax),%esp
                    767:        xorl    %ebp,%ebp               # mark end of frames
                    768:
                    769:        addl    $USPACE, %esi
                    770:        subl    $KERNBASE, %esi         #init386 want a physical address
                    771:        pushl   %esi
                    772:        call    _C_LABEL(init386)       # wire 386 chip for unix operation
                    773:        addl    $4,%esp
                    774:        call    _C_LABEL(main)
                    775:
                    776: #if defined(XEN3) && !defined(XEN_COMPAT_030001)
                    777: /* space for the hypercall call page */
                    778: #define HYPERCALL_PAGE_OFFSET 0x1000
                    779: .org HYPERCALL_PAGE_OFFSET
                    780: ENTRY(hypercall_page)
                    781: .skip 0x1000
                    782: #endif /* defined(XEN3) && !defined(XEN_COMPAT_030001) */
                    783:
                    784: /*
                    785:  * void lgdt_finish(void);
                    786:  * Finish load a new GDT pointer (do any necessary cleanup).
                    787:  * XXX It's somewhat questionable whether reloading all the segment registers
                    788:  * is necessary, since the actual descriptor data is not changed except by
                    789:  * process creation and exit, both of which clean up via task switches.  OTOH,
                    790:  * this only happens at run time when the GDT is resized.
                    791:  */
                    792: /* LINTSTUB: Func: void lgdt_finish(void) */
                    793: NENTRY(lgdt_finish)
                    794:        movl    $GSEL(GDATA_SEL, SEL_KPL),%eax
                    795:        movw    %ax,%ds
                    796:        movw    %ax,%es
                    797:        movw    %ax,%gs
                    798:        movw    %ax,%ss
                    799:        movl    $GSEL(GCPU_SEL, SEL_KPL),%eax
                    800:        movw    %ax,%fs
                    801:        /* Reload code selector by doing intersegment return. */
                    802:        popl    %eax
                    803:        pushl   $GSEL(GCODE_SEL, SEL_KPL)
                    804:        pushl   %eax
                    805:        lret
                    806:
                    807: #endif /* XEN */
1.1       fvdl      808:
                    809: /*
1.48      yamt      810:  * void lwp_trampoline(void);
                    811:  *
1.1       fvdl      812:  * This is a trampoline function pushed onto the stack of a newly created
                    813:  * process in order to do some additional setup.  The trampoline is entered by
                    814:  * cpu_switch()ing to the process, so we abuse the callee-saved registers used
                    815:  * by cpu_switch() to store the information about the stub to call.
                    816:  * NOTE: This function does not have a normal calling sequence!
                    817:  */
1.48      yamt      818: NENTRY(lwp_trampoline)
1.68    ! ad        819:        movl    %ebp,%edi       /* for .Lsyscall_checkast */
1.48      yamt      820:        xorl    %ebp,%ebp
1.68    ! ad        821:        pushl   %edi
1.48      yamt      822:        pushl   %eax
                    823:        call    _C_LABEL(lwp_startup)
                    824:        addl    $8,%esp
1.1       fvdl      825:        pushl   %ebx
                    826:        call    *%esi
                    827:        addl    $4,%esp
1.68    ! ad        828:        jmp     .Lsyscall_checkast
1.1       fvdl      829:        /* NOTREACHED */
                    830:
                    831: /*
1.48      yamt      832:  * sigcode()
                    833:  *
                    834:  * Signal trampoline; copied to top of user stack.  Used only for
                    835:  * compatibility with old releases of NetBSD.
1.1       fvdl      836:  */
                    837: NENTRY(sigcode)
                    838:        /*
                    839:         * Handler has returned here as if we called it.  The sigcontext
                    840:         * is on the stack after the 3 args "we" pushed.
                    841:         */
                    842:        leal    12(%esp),%eax           # get pointer to sigcontext
                    843:        movl    %eax,4(%esp)            # put it in the argument slot
                    844:                                        # fake return address already there
1.17      christos  845:        movl    $SYS_compat_16___sigreturn14,%eax
1.1       fvdl      846:        int     $0x80                   # enter kernel with args on stack
                    847:        movl    $SYS_exit,%eax
                    848:        int     $0x80                   # exit if sigreturn fails
                    849:        .globl  _C_LABEL(esigcode)
                    850: _C_LABEL(esigcode):
                    851:
                    852: /*
1.48      yamt      853:  * int setjmp(label_t *)
                    854:  *
                    855:  * Used primarily by DDB.
1.1       fvdl      856:  */
                    857: ENTRY(setjmp)
                    858:        movl    4(%esp),%eax
                    859:        movl    %ebx,(%eax)             # save ebx
                    860:        movl    %esp,4(%eax)            # save esp
                    861:        movl    %ebp,8(%eax)            # save ebp
                    862:        movl    %esi,12(%eax)           # save esi
                    863:        movl    %edi,16(%eax)           # save edi
                    864:        movl    (%esp),%edx             # get rta
                    865:        movl    %edx,20(%eax)           # save eip
1.48      yamt      866:        xorl    %eax,%eax               # return 0
1.1       fvdl      867:        ret
                    868:
1.48      yamt      869: /*
                    870:  * int longjmp(label_t *)
                    871:  *
                    872:  * Used primarily by DDB.
                    873:  */
1.1       fvdl      874: ENTRY(longjmp)
                    875:        movl    4(%esp),%eax
                    876:        movl    (%eax),%ebx             # restore ebx
                    877:        movl    4(%eax),%esp            # restore esp
                    878:        movl    8(%eax),%ebp            # restore ebp
                    879:        movl    12(%eax),%esi           # restore esi
                    880:        movl    16(%eax),%edi           # restore edi
                    881:        movl    20(%eax),%edx           # get rta
                    882:        movl    %edx,(%esp)             # put in return frame
1.48      yamt      883:        movl    $1,%eax                 # return 1
1.1       fvdl      884:        ret
                    885:
1.65      skrll     886: /*
                    887:  * void dumpsys(void)
                    888:  *
                    889:  * Mimic cpu_switchto() for postmortem debugging.
                    890:  */
1.64      skrll     891: ENTRY(dumpsys)
1.65      skrll     892:        pushl   %ebx                    # set up fake switchframe
                    893:        pushl   %esi                    #   and save context
                    894:        pushl   %edi
                    895:        movl    %esp,_C_LABEL(dumppcb)+PCB_ESP
                    896:        movl    %ebp,_C_LABEL(dumppcb)+PCB_EBP
                    897:        call    _C_LABEL(dodumpsys)     # dump!
                    898:        addl    $(3*4), %esp            # unwind switchframe
1.64      skrll     899:        ret
                    900:
1.1       fvdl      901: /*
1.58      ad        902:  * struct lwp *cpu_switchto(struct lwp *oldlwp, struct newlwp,
                    903:  *                         bool returning)
1.30      junyoung  904:  *
1.48      yamt      905:  *     1. if (oldlwp != NULL), save its context.
                    906:  *     2. then, restore context of newlwp.
                    907:  *
                    908:  * Note that the stack frame layout is known to "struct switchframe" in
                    909:  * <machine/frame.h> and to the code in cpu_lwp_fork() which initializes
1.5       thorpej   910:  * it for a new lwp.
1.1       fvdl      911:  */
1.48      yamt      912: ENTRY(cpu_switchto)
1.1       fvdl      913:        pushl   %ebx
                    914:        pushl   %esi
                    915:        pushl   %edi
                    916:
1.48      yamt      917:        movl    16(%esp),%esi           # oldlwp
                    918:        movl    20(%esp),%edi           # newlwp
1.58      ad        919:        movl    24(%esp),%edx           # returning
1.48      yamt      920:        testl   %esi,%esi
                    921:        jz      1f
1.1       fvdl      922:
1.48      yamt      923:        /* Save old context. */
                    924:        movl    L_ADDR(%esi),%eax
                    925:        movl    %esp,PCB_ESP(%eax)
                    926:        movl    %ebp,PCB_EBP(%eax)
                    927:
                    928:        /* Switch to newlwp's stack. */
                    929: 1:     movl    L_ADDR(%edi),%ebx
                    930:        movl    PCB_EBP(%ebx),%ebp
                    931:        movl    PCB_ESP(%ebx),%esp
1.1       fvdl      932:
1.61      ad        933:        /*
                    934:         * Set curlwp.  This must be globally visible in order to permit
                    935:         * non-interlocked mutex release.
                    936:         */
                    937:        movl    %edi,%ecx
                    938:        xchgl   %ecx,CPUVAR(CURLWP)
1.58      ad        939:
                    940:        /* Skip the rest if returning to a pinned LWP. */
                    941:        testl   %edx,%edx
                    942:        jnz     4f
                    943:
1.62      bouyer    944: #ifdef XEN
                    945:        pushl   %edi
                    946:        call    _C_LABEL(i386_switch_context)
                    947:        addl    $4,%esp
                    948: #else /* XEN */
1.60      yamt      949:        /* Switch ring0 esp */
                    950:        movl    PCB_ESP0(%ebx),%eax
                    951:        movl    %eax,CPUVAR(ESP0)
1.1       fvdl      952:
                    953:        /* Don't bother with the rest if switching to a system process. */
1.48      yamt      954:        testl   $LW_SYSTEM,L_FLAG(%edi)
                    955:        jnz     4f
1.1       fvdl      956:
1.54      ad        957:        /* Restore thread-private %fs/%gs descriptors. */
1.60      yamt      958:        movl    CPUVAR(GDT),%ecx
1.55      ad        959:        movl    PCB_FSD(%ebx), %eax
                    960:        movl    PCB_FSD+4(%ebx), %edx
1.54      ad        961:        movl    %eax, (GUFS_SEL*8)(%ecx)
                    962:        movl    %edx, (GUFS_SEL*8+4)(%ecx)
1.55      ad        963:        movl    PCB_GSD(%ebx), %eax
                    964:        movl    PCB_GSD+4(%ebx), %edx
1.54      ad        965:        movl    %eax, (GUGS_SEL*8)(%ecx)
                    966:        movl    %edx, (GUGS_SEL*8+4)(%ecx)
1.62      bouyer    967: #endif /* XEN */
1.54      ad        968:
1.60      yamt      969:        /* Switch I/O bitmap */
                    970:        movl    PCB_IOMAP(%ebx),%eax
                    971:        orl     %eax,%eax
                    972:        jnz,pn  .Lcopy_iobitmap
                    973:        movl    $(IOMAP_INVALOFF << 16),CPUVAR(IOBASE)
                    974: .Liobitmap_done:
                    975:
1.56      ad        976:        /* Is this process using RAS (restartable atomic sequences)? */
                    977:        movl    L_PROC(%edi),%eax
                    978:        cmpl    $0,P_RASLIST(%eax)
                    979:        jne     5f
                    980:
1.48      yamt      981:        /*
                    982:         * Restore cr0 (including FPU state).  Raise the IPL to IPL_IPI.
                    983:         * FPU IPIs can alter the LWP's saved cr0.  Dropping the priority
                    984:         * is deferred until mi_switch(), when cpu_switchto() returns.
                    985:         */
1.62      bouyer    986: 2:
                    987: #ifndef XEN
                    988:        movl    $IPL_IPI,CPUVAR(ILEVEL)
1.48      yamt      989:        movl    PCB_CR0(%ebx),%ecx
                    990:        movl    %cr0,%edx
1.1       fvdl      991:
1.30      junyoung  992:        /*
1.22      wiz       993:         * If our floating point registers are on a different CPU,
1.48      yamt      994:         * set CR0_TS so we'll trap rather than reuse bogus state.
1.1       fvdl      995:         */
1.48      yamt      996:        movl    PCB_FPCPU(%ebx),%eax
                    997:        cmpl    CPUVAR(SELF),%eax
                    998:        je      3f
1.1       fvdl      999:        orl     $CR0_TS,%ecx
1.48      yamt     1000:
                   1001:        /* Reloading CR0 is very expensive - avoid if possible. */
                   1002: 3:     cmpl    %edx,%ecx
                   1003:        je      4f
1.1       fvdl     1004:        movl    %ecx,%cr0
1.62      bouyer   1005: #endif /* XEN */
1.1       fvdl     1006:
1.48      yamt     1007:        /* Return to the new LWP, returning 'oldlwp' in %eax. */
                   1008: 4:     movl    %esi,%eax
1.1       fvdl     1009:        popl    %edi
                   1010:        popl    %esi
                   1011:        popl    %ebx
                   1012:        ret
1.20      dsl      1013:
1.48      yamt     1014:        /* Check for restartable atomic sequences (RAS). */
                   1015: 5:     movl    L_MD_REGS(%edi),%ecx
                   1016:        pushl   TF_EIP(%ecx)
1.20      dsl      1017:        pushl   %eax
                   1018:        call    _C_LABEL(ras_lookup)
                   1019:        addl    $8,%esp
                   1020:        cmpl    $-1,%eax
1.48      yamt     1021:        je      2b
1.49      ad       1022:        movl    L_MD_REGS(%edi),%ecx
                   1023:        movl    %eax,TF_EIP(%ecx)
1.48      yamt     1024:        jmp     2b
1.1       fvdl     1025:
1.60      yamt     1026: .Lcopy_iobitmap:
                   1027:        /* Copy I/O bitmap. */
                   1028:        movl    $(IOMAPSIZE/4),%ecx
                   1029:        pushl   %esi
                   1030:        pushl   %edi
                   1031:        movl    %eax,%esi               /* pcb_iomap */
                   1032:        movl    CPUVAR(SELF),%edi
                   1033:        leal    CPU_INFO_IOMAP(%edi),%edi
                   1034:        rep
                   1035:        movsl
                   1036:        popl    %edi
                   1037:        popl    %esi
                   1038:        movl    $((CPU_INFO_IOMAP - CPU_INFO_TSS) << 16),CPUVAR(IOBASE)
                   1039:        jmp     .Liobitmap_done
                   1040:
1.1       fvdl     1041: /*
                   1042:  * void savectx(struct pcb *pcb);
1.48      yamt     1043:  *
1.1       fvdl     1044:  * Update pcb, saving current processor state.
                   1045:  */
                   1046: ENTRY(savectx)
1.47      skrll    1047:        movl    4(%esp),%edx            # edx = pcb
1.1       fvdl     1048:        movl    %esp,PCB_ESP(%edx)
                   1049:        movl    %ebp,PCB_EBP(%edx)
                   1050:        ret
                   1051:
                   1052: /*
1.48      yamt     1053:  * osyscall()
                   1054:  *
1.1       fvdl     1055:  * Old call gate entry for syscall
                   1056:  */
                   1057: IDTVEC(osyscall)
1.48      yamt     1058:        pushfl                  # set eflags in trap frame
1.1       fvdl     1059:        popl    8(%esp)
                   1060:        pushl   $7              # size of instruction for restart
                   1061:        jmp     syscall1
                   1062:
                   1063: /*
1.48      yamt     1064:  * syscall()
                   1065:  *
1.1       fvdl     1066:  * Trap gate entry for syscall
                   1067:  */
                   1068: IDTVEC(syscall)
                   1069:        pushl   $2              # size of instruction for restart
                   1070: syscall1:
                   1071:        pushl   $T_ASTFLT       # trap # for doing ASTs
                   1072:        INTRENTRY
                   1073: #ifdef DIAGNOSTIC
                   1074:        movl    CPUVAR(ILEVEL),%ebx
                   1075:        testl   %ebx,%ebx
                   1076:        jz      1f
                   1077:        pushl   $5f
                   1078:        call    _C_LABEL(printf)
                   1079:        addl    $4,%esp
                   1080: #ifdef DDB
                   1081:        int     $3
                   1082: #endif
1.30      junyoung 1083: 1:
1.1       fvdl     1084: #endif /* DIAGNOSTIC */
1.67      ad       1085:        incl    CPUVAR(NSYSCALL)        # count it atomically
1.68    ! ad       1086:        movl    CPUVAR(CURLWP),%edi
        !          1087:        movl    L_PROC(%edi),%edx
        !          1088:        movl    %esp,L_MD_REGS(%edi)    # save pointer to frame
1.15      fvdl     1089:        pushl   %esp
1.1       fvdl     1090:        call    *P_MD_SYSCALL(%edx)     # get pointer to syscall() function
1.15      fvdl     1091:        addl    $4,%esp
1.27      yamt     1092: .Lsyscall_checkast:
1.24      yamt     1093:        /* Check for ASTs on exit to user mode. */
1.62      bouyer   1094:        CLI(%eax)
1.68    ! ad       1095:        movl    L_MD_ASTPENDING(%edi), %eax
        !          1096:        orl     CPUVAR(WANT_PMAPLOAD), %eax
1.24      yamt     1097:        jnz     9f
1.62      bouyer   1098: #ifdef XEN
                   1099:        STIC(%eax)
                   1100:        jz      14f
                   1101:        call    _C_LABEL(stipending)
                   1102:        testl   %eax,%eax
                   1103:        jz      14f
                   1104:        /* process pending interrupts */
                   1105:        CLI(%eax)
                   1106:        movl    CPUVAR(ILEVEL), %ebx
                   1107:        movl    $.Lsyscall_resume, %esi # address to resume loop at
                   1108: .Lsyscall_resume:
                   1109:        movl    %ebx,%eax       # get cpl
                   1110:        movl    CPUVAR(IUNMASK)(,%eax,4),%eax
                   1111:        andl    CPUVAR(IPENDING),%eax   # any non-masked bits left?
                   1112:        jz      17f
                   1113:        bsrl    %eax,%eax
                   1114:        btrl    %eax,CPUVAR(IPENDING)
                   1115:        movl    CPUVAR(ISOURCES)(,%eax,4),%eax
                   1116:        jmp     *IS_RESUME(%eax)
                   1117: 17:    movl    %ebx, CPUVAR(ILEVEL)    #restore cpl
                   1118:        jmp     .Lsyscall_checkast
                   1119: 14:
                   1120: #endif /* XEN */
1.1       fvdl     1121: #ifndef DIAGNOSTIC
1.24      yamt     1122:        INTRFASTEXIT
1.1       fvdl     1123: #else /* DIAGNOSTIC */
1.24      yamt     1124:        cmpl    $IPL_NONE,CPUVAR(ILEVEL)
1.1       fvdl     1125:        jne     3f
                   1126:        INTRFASTEXIT
1.62      bouyer   1127: 3:     STI(%eax)
1.1       fvdl     1128:        pushl   $4f
                   1129:        call    _C_LABEL(printf)
                   1130:        addl    $4,%esp
1.58      ad       1131:        pushl   $IPL_NONE
                   1132:        call    _C_LABEL(spllower)
                   1133:        addl    $4,%esp
1.53      yamt     1134:        jmp     .Lsyscall_checkast
1.1       fvdl     1135: 4:     .asciz  "WARNING: SPL NOT LOWERED ON SYSCALL EXIT\n"
1.30      junyoung 1136: 5:     .asciz  "WARNING: SPL NOT ZERO ON SYSCALL ENTRY\n"
1.1       fvdl     1137: #endif /* DIAGNOSTIC */
1.68    ! ad       1138: 9:
        !          1139:        cmpl    $0, CPUVAR(WANT_PMAPLOAD)
        !          1140:        jz      10f
        !          1141:        STI(%eax)
1.24      yamt     1142:        call    _C_LABEL(pmap_load)
1.27      yamt     1143:        jmp     .Lsyscall_checkast      /* re-check ASTs */
1.68    ! ad       1144: 10:
        !          1145:        /* Always returning to user mode here. */
        !          1146:        movl    $0, L_MD_ASTPENDING(%edi)
        !          1147:        STI(%eax)
        !          1148:        /* Pushed T_ASTFLT into tf_trapno on entry. */
        !          1149:        pushl   %esp
        !          1150:        call    _C_LABEL(trap)
        !          1151:        addl    $4,%esp
        !          1152:        jmp     .Lsyscall_checkast      /* re-check ASTs */
1.1       fvdl     1153:
                   1154: #if NNPX > 0
                   1155: /*
                   1156:  * Special interrupt handlers.  Someday intr0-intr15 will be used to count
                   1157:  * interrupts.  We'll still need a special exception 16 handler.  The busy
                   1158:  * latch stuff in probintr() can be moved to npxprobe().
                   1159:  */
                   1160:
1.48      yamt     1161: /*
                   1162:  * void probeintr(void)
                   1163:  */
1.1       fvdl     1164: NENTRY(probeintr)
                   1165:        ss
                   1166:        incl    _C_LABEL(npx_intrs_while_probing)
                   1167:        pushl   %eax
                   1168:        movb    $0x20,%al       # EOI (asm in strings loses cpp features)
                   1169:        outb    %al,$0xa0       # IO_ICU2
                   1170:        outb    %al,$0x20       # IO_ICU1
                   1171:        movb    $0,%al
                   1172:        outb    %al,$0xf0       # clear BUSY# latch
                   1173:        popl    %eax
                   1174:        iret
                   1175:
1.48      yamt     1176: /*
                   1177:  * void probetrap(void)
                   1178:  */
1.1       fvdl     1179: NENTRY(probetrap)
                   1180:        ss
                   1181:        incl    _C_LABEL(npx_traps_while_probing)
                   1182:        fnclex
                   1183:        iret
                   1184:
1.48      yamt     1185: /*
                   1186:  * int npx586bug1(int a, int b)
                   1187:  */
1.1       fvdl     1188: NENTRY(npx586bug1)
                   1189:        fildl   4(%esp)         # x
                   1190:        fildl   8(%esp)         # y
                   1191:        fld     %st(1)
                   1192:        fdiv    %st(1),%st      # x/y
                   1193:        fmulp   %st,%st(1)      # (x/y)*y
                   1194:        fsubrp  %st,%st(1)      # x-(x/y)*y
                   1195:        pushl   $0
                   1196:        fistpl  (%esp)
                   1197:        popl    %eax
                   1198:        ret
                   1199: #endif /* NNPX > 0 */
1.50      ad       1200:
                   1201: /*
                   1202:  * void sse2_zero_page(void *pg)
                   1203:  *
                   1204:  * Zero a page without polluting the cache.
                   1205:  */
                   1206: ENTRY(sse2_zero_page)
                   1207:        pushl   %ebp
                   1208:        movl    %esp,%ebp
                   1209:        movl    8(%esp), %edx
                   1210:        movl    $PAGE_SIZE, %ecx
                   1211:        xorl    %eax, %eax
                   1212:        .align  16
                   1213: 1:
                   1214:        movnti  %eax, 0(%edx)
                   1215:        movnti  %eax, 4(%edx)
                   1216:        movnti  %eax, 8(%edx)
                   1217:        movnti  %eax, 12(%edx)
                   1218:        movnti  %eax, 16(%edx)
                   1219:        movnti  %eax, 20(%edx)
                   1220:        movnti  %eax, 24(%edx)
                   1221:        movnti  %eax, 28(%edx)
                   1222:        subl    $32, %ecx
                   1223:        leal    32(%edx), %edx
                   1224:        jnz     1b
                   1225:        sfence
                   1226:        pop     %ebp
                   1227:        ret
                   1228:
                   1229: /*
                   1230:  * void sse2_copy_page(void *src, void *dst)
                   1231:  *
                   1232:  * Copy a page without polluting the cache.
                   1233:  */
                   1234: ENTRY(sse2_copy_page)
                   1235:        pushl   %ebp
                   1236:        pushl   %ebx
                   1237:        pushl   %esi
                   1238:        pushl   %edi
                   1239:        movl    20(%esp), %esi
                   1240:        movl    24(%esp), %edi
                   1241:        movl    $PAGE_SIZE, %ebp
                   1242:        .align  16
                   1243: 1:
                   1244:        movl    0(%esi), %eax
                   1245:        movl    4(%esi), %ebx
                   1246:        movl    8(%esi), %ecx
                   1247:        movl    12(%esi), %edx
                   1248:        movnti  %eax, 0(%edi)
                   1249:        movnti  %ebx, 4(%edi)
                   1250:        movnti  %ecx, 8(%edi)
                   1251:        movnti  %edx, 12(%edi)
                   1252:        subl    $16, %ebp
                   1253:        leal    16(%esi), %esi
                   1254:        leal    16(%edi), %edi
                   1255:        jnz     1b
                   1256:        sfence
                   1257:        popl    %edi
                   1258:        popl    %esi
                   1259:        popl    %ebx
                   1260:        popl    %ebp
                   1261:        ret

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