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Annotation of src/sys/arch/i386/i386/locore.S, Revision 1.124

1.123     maxv        1: /*     $NetBSD: locore.S,v 1.122 2016/05/14 09:51:56 maxv 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: /*-
1.84      ad         68:  * Copyright (c) 1998, 2000, 2004, 2006, 2007, 2009 The NetBSD Foundation, Inc.
1.1       fvdl       69:  * All rights reserved.
                     70:  *
                     71:  * This code is derived from software contributed to The NetBSD Foundation
1.84      ad         72:  * by Charles M. Hannum, and by Andrew Doran.
1.1       fvdl       73:  *
                     74:  * Redistribution and use in source and binary forms, with or without
                     75:  * modification, are permitted provided that the following conditions
                     76:  * are met:
                     77:  * 1. Redistributions of source code must retain the above copyright
                     78:  *    notice, this list of conditions and the following disclaimer.
                     79:  * 2. Redistributions in binary form must reproduce the above copyright
                     80:  *    notice, this list of conditions and the following disclaimer in the
                     81:  *    documentation and/or other materials provided with the distribution.
                     82:  *
                     83:  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
                     84:  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
                     85:  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
                     86:  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
                     87:  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
                     88:  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
                     89:  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
                     90:  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
                     91:  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
                     92:  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
                     93:  * POSSIBILITY OF SUCH DAMAGE.
                     94:  */
                     95:
                     96: /*-
                     97:  * Copyright (c) 1990 The Regents of the University of California.
                     98:  * All rights reserved.
                     99:  *
                    100:  * This code is derived from software contributed to Berkeley by
                    101:  * William Jolitz.
                    102:  *
                    103:  * Redistribution and use in source and binary forms, with or without
                    104:  * modification, are permitted provided that the following conditions
                    105:  * are met:
                    106:  * 1. Redistributions of source code must retain the above copyright
                    107:  *    notice, this list of conditions and the following disclaimer.
                    108:  * 2. Redistributions in binary form must reproduce the above copyright
                    109:  *    notice, this list of conditions and the following disclaimer in the
                    110:  *    documentation and/or other materials provided with the distribution.
1.12      agc       111:  * 3. Neither the name of the University nor the names of its contributors
1.1       fvdl      112:  *    may be used to endorse or promote products derived from this software
                    113:  *    without specific prior written permission.
                    114:  *
                    115:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
                    116:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                    117:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                    118:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
                    119:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                    120:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                    121:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                    122:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                    123:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                    124:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                    125:  * SUCH DAMAGE.
                    126:  *
                    127:  *     @(#)locore.s    7.3 (Berkeley) 5/13/91
                    128:  */
                    129:
1.59      lukem     130: #include <machine/asm.h>
1.123     maxv      131: __KERNEL_RCSID(0, "$NetBSD: locore.S,v 1.122 2016/05/14 09:51:56 maxv Exp $");
1.59      lukem     132:
1.18      christos  133: #include "opt_compat_oldboot.h"
1.114     uebayasi  134: #include "opt_copy_symtab.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: /* Get definitions for IOM_BEGIN, IOM_END, and IOM_SIZE */
                    162: #include <dev/isa/isareg.h>
                    163:
1.104     uebayasi  164: #ifndef XEN
                    165: #define        _RELOC(x)       ((x) - KERNBASE)
                    166: #else
                    167: #define        _RELOC(x)       ((x))
                    168: #endif /* XEN */
                    169: #define        RELOC(x)        _RELOC(_C_LABEL(x))
                    170:
1.119     maxv      171: /* 32bit version of PG_NX */
                    172: #define PG_NX32        0x80000000
                    173:
1.115     maxv      174: #ifndef PAE
                    175: #define        PROC0_PDIR_OFF  0
                    176: #else
                    177: #define PROC0_L3_OFF   0
                    178: #define PROC0_PDIR_OFF 1 * PAGE_SIZE
                    179: #endif
                    180:
                    181: #define        PROC0_STK_OFF   (PROC0_PDIR_OFF + PDP_SIZE * PAGE_SIZE)
                    182: #define        PROC0_PTP1_OFF  (PROC0_STK_OFF + UPAGES * PAGE_SIZE)
                    183:
                    184: /*
                    185:  * fillkpt - Fill in a kernel page table
                    186:  *     eax = pte (page frame | control | status)
                    187:  *     ebx = page table address
                    188:  *     ecx = number of pages to map
                    189:  *
                    190:  * For PAE, each entry is 8 bytes long: we must set the 4 upper bytes to 0.
                    191:  * This is done by the first instruction of fillkpt. In the non-PAE case, this
                    192:  * instruction just clears the page table entry.
                    193:  */
                    194: #define fillkpt        \
                    195: 1:     movl    $0,(PDE_SIZE-4)(%ebx)   ;       /* upper 32 bits: 0 */  \
                    196:        movl    %eax,(%ebx)             ;       /* store phys addr */   \
                    197:        addl    $PDE_SIZE,%ebx          ;       /* next PTE/PDE */      \
                    198:        addl    $PAGE_SIZE,%eax         ;       /* next phys page */    \
                    199:        loop    1b                      ;
                    200:
1.118     maxv      201: /*
1.120     maxv      202:  * fillkpt_nox - Same as fillkpt, but sets the NX/XD bit.
                    203:  */
                    204: #define fillkpt_nox \
                    205:        pushl   %ebp                    ; \
                    206:        movl    RELOC(nox_flag),%ebp    ; \
                    207: 1:     movl    %ebp,(PDE_SIZE-4)(%ebx) ;       /* upper 32 bits: NX */ \
                    208:        movl    %eax,(%ebx)             ;       /* store phys addr */   \
                    209:        addl    $PDE_SIZE,%ebx          ;       /* next PTE/PDE */      \
                    210:        addl    $PAGE_SIZE,%eax         ;       /* next phys page */    \
                    211:        loop    1b                      ; \
                    212:        popl    %ebp                    ;
                    213:
                    214: /*
1.118     maxv      215:  * killkpt - Destroy a kernel page table
                    216:  *     ebx = page table address
                    217:  *     ecx = number of pages to destroy
                    218:  */
                    219: #define killkpt \
                    220: 1:     movl    $0,(PDE_SIZE-4)(%ebx)   ;       /* upper bits (for PAE) */ \
                    221:        movl    $0,(%ebx)               ; \
                    222:        addl    $PDE_SIZE,%ebx          ; \
                    223:        loop    1b                      ;
                    224:
1.115     maxv      225:
1.62      bouyer    226: #ifdef XEN
                    227: /*
                    228:  * Xen guest identifier and loader selection
                    229:  */
                    230: .section __xen_guest
                    231:        .ascii  "GUEST_OS=netbsd,GUEST_VER=3.0,XEN_VER=xen-3.0"
1.106     uebayasi  232:        .ascii  ",VIRT_BASE=0xc0000000" /* KERNBASE */
                    233:        .ascii  ",ELF_PADDR_OFFSET=0xc0000000" /* KERNBASE */
                    234:        .ascii  ",VIRT_ENTRY=0xc0100000" /* KERNTEXTOFF */
                    235:        .ascii  ",HYPERCALL_PAGE=0x00000101"
1.62      bouyer    236:                /* (???+HYPERCALL_PAGE_OFFSET)/PAGE_SIZE) */
1.66      bouyer    237: #ifdef PAE
1.106     uebayasi  238:        .ascii  ",PAE=yes[extended-cr3]"
1.66      bouyer    239: #endif
1.62      bouyer    240:        .ascii  ",LOADER=generic"
1.114     uebayasi  241: #if (NKSYMS || defined(DDB) || defined(MODULAR)) && !defined(makeoptions_COPY_SYMTAB)
1.62      bouyer    242:        .ascii  ",BSD_SYMTAB=yes"
                    243: #endif
                    244:        .byte   0
1.106     uebayasi  245: #endif /* XEN */
1.62      bouyer    246:
1.1       fvdl      247: /*
                    248:  * Initialization
                    249:  */
                    250:        .data
                    251:
1.119     maxv      252:        .globl  _C_LABEL(nox_flag)
1.100     chs       253:        .globl  _C_LABEL(cputype)
1.73      ad        254:        .globl  _C_LABEL(cpuid_level)
1.38      jmmv      255:        .globl  _C_LABEL(esym)
1.71      ad        256:        .globl  _C_LABEL(eblob)
1.38      jmmv      257:        .globl  _C_LABEL(atdevbase)
1.104     uebayasi  258:        .globl  _C_LABEL(lwp0uarea)
                    259:        .globl  _C_LABEL(PDPpaddr)
1.1       fvdl      260:        .globl  _C_LABEL(gdt)
                    261:        .globl  _C_LABEL(idt)
1.30      junyoung  262:        .globl  _C_LABEL(lapic_tpr)
                    263:
1.1       fvdl      264: #if NLAPIC > 0
                    265: #ifdef __ELF__
1.7       thorpej   266:        .align  PAGE_SIZE
1.1       fvdl      267: #else
                    268:        .align  12
                    269: #endif
                    270:        .globl _C_LABEL(local_apic), _C_LABEL(lapic_id)
1.104     uebayasi  271:        .type   _C_LABEL(local_apic), @object
                    272: LABEL(local_apic)
1.1       fvdl      273:        .space  LAPIC_ID
1.104     uebayasi  274: END(local_apic)
                    275:        .type   _C_LABEL(lapic_id), @object
                    276: LABEL(lapic_id)
1.1       fvdl      277:        .long   0x00000000
1.106     uebayasi  278:        .space  LAPIC_TPRI-(LAPIC_ID+4)
1.104     uebayasi  279: END(lapic_id)
                    280:        .type   _C_LABEL(lapic_tpr), @object
                    281: LABEL(lapic_tpr)
1.106     uebayasi  282:        .space  LAPIC_PPRI-LAPIC_TPRI
1.104     uebayasi  283: END(lapic_tpr)
                    284:        .type   _C_LABEL(lapic_ppr), @object
1.30      junyoung  285: _C_LABEL(lapic_ppr):
1.1       fvdl      286:        .space  LAPIC_ISR-LAPIC_PPRI
1.104     uebayasi  287: END(lapic_ppr)
                    288:        .type   _C_LABEL(lapic_isr), @object
1.1       fvdl      289: _C_LABEL(lapic_isr):
1.7       thorpej   290:        .space  PAGE_SIZE-LAPIC_ISR
1.104     uebayasi  291: END(lapic_isr)
1.1       fvdl      292: #else
1.104     uebayasi  293:        .type   _C_LABEL(lapic_tpr), @object
                    294: LABEL(lapic_tpr)
1.1       fvdl      295:        .long 0
1.104     uebayasi  296: END(lapic_tpr)
1.1       fvdl      297: #endif
1.119     maxv      298:
                    299:        .type   _C_LABEL(nox_flag), @object
                    300: LABEL(nox_flag)                .long   0       /* 32bit NOX flag, set if supported */
                    301: END(nox_flag)
1.104     uebayasi  302:        .type   _C_LABEL(cputype), @object
1.115     maxv      303: LABEL(cputype)         .long   0       /* are we 80486, Pentium, or.. */
1.104     uebayasi  304: END(cputype)
                    305:        .type   _C_LABEL(cpuid_level), @object
                    306: LABEL(cpuid_level)     .long   0
                    307: END(cpuid_level)
                    308:        .type   _C_LABEL(atdevbase), @object
1.115     maxv      309: LABEL(atdevbase)       .long   0       /* location of start of iomem in virt */
1.104     uebayasi  310: END(atdevbase)
                    311:        .type   _C_LABEL(lwp0uarea), @object
                    312: LABEL(lwp0uarea)       .long   0
                    313: END(lwp0uarea)
                    314:        .type   _C_LABEL(PDPpaddr), @object
1.115     maxv      315: LABEL(PDPpaddr)                .long   0       /* paddr of PDP, for libkvm */
1.104     uebayasi  316: END(PDPpaddr)
                    317:        .type   _C_LABEL(tablesize), @object
1.53      yamt      318: _C_LABEL(tablesize):   .long   0
1.104     uebayasi  319: END(tablesize)
1.115     maxv      320:
                    321:        /* Space for the temporary stack */
1.104     uebayasi  322:        .size   tmpstk, tmpstk - .
1.115     maxv      323:        .space  512
1.1       fvdl      324: tmpstk:
1.96      cherry    325: #ifdef XEN
1.115     maxv      326:        .align          PAGE_SIZE, 0x0  /* Align on page boundary */
1.104     uebayasi  327: LABEL(tmpgdt)
1.115     maxv      328:        .space          PAGE_SIZE       /* Xen expects a page */
1.104     uebayasi  329: END(tmpgdt)
1.96      cherry    330: #endif /* XEN */
1.1       fvdl      331:
                    332:        .text
                    333:        .globl  _C_LABEL(kernel_text)
                    334:        .set    _C_LABEL(kernel_text),KERNTEXTOFF
                    335:
1.104     uebayasi  336: ENTRY(start)
1.62      bouyer    337: #ifndef XEN
1.115     maxv      338:
                    339:        /* Warm boot */
                    340:        movw    $0x1234,0x472
                    341:
1.37      jmmv      342: #if defined(MULTIBOOT)
                    343:        jmp     1f
                    344:
                    345:        .align  4
                    346:        .globl  Multiboot_Header
                    347: _C_LABEL(Multiboot_Header):
1.44      jmmv      348: #define MULTIBOOT_HEADER_FLAGS (MULTIBOOT_HEADER_WANT_MEMORY)
1.37      jmmv      349:        .long   MULTIBOOT_HEADER_MAGIC
                    350:        .long   MULTIBOOT_HEADER_FLAGS
                    351:        .long   -(MULTIBOOT_HEADER_MAGIC + MULTIBOOT_HEADER_FLAGS)
                    352:
                    353: 1:
                    354:        /* Check if we are being executed by a Multiboot-compliant boot
                    355:         * loader. */
                    356:        cmpl    $MULTIBOOT_INFO_MAGIC,%eax
                    357:        jne     1f
                    358:
1.43      mrg       359:        /*
                    360:         * Indeed, a multiboot-compliant boot loader executed us.  We copy
1.37      jmmv      361:         * the received Multiboot information structure into kernel's data
                    362:         * space to process it later -- after we are relocated.  It will
1.43      mrg       363:         * be safer to run complex C code than doing it at this point.
                    364:         */
1.115     maxv      365:        pushl   %ebx            /* Address of Multiboot information */
1.37      jmmv      366:        call    _C_LABEL(multiboot_pre_reloc)
                    367:        addl    $4,%esp
1.38      jmmv      368:        jmp     2f
1.37      jmmv      369: #endif
                    370:
                    371: 1:
1.1       fvdl      372:        /*
1.38      jmmv      373:         * At this point, we know that a NetBSD-specific boot loader
1.117     maxv      374:         * booted this kernel.
                    375:         *
                    376:         * Load parameters from the stack (32 bits):
                    377:         *     boothowto, [bootdev], bootinfo, esym, biosextmem, biosbasemem
                    378:         * We are not interested in 'bootdev'.
1.1       fvdl      379:         */
1.117     maxv      380:
1.115     maxv      381:        addl    $4,%esp         /* Discard return address to boot loader */
1.38      jmmv      382:        call    _C_LABEL(native_loader)
                    383:        addl    $24,%esp
1.1       fvdl      384:
                    385: 2:
                    386:        /* First, reset the PSL. */
                    387:        pushl   $PSL_MBO
                    388:        popfl
                    389:
                    390:        /* Clear segment registers; always null in proc0. */
                    391:        xorl    %eax,%eax
                    392:        movw    %ax,%fs
                    393:        movw    %ax,%gs
                    394:        decl    %eax
1.73      ad        395:        movl    %eax,RELOC(cpuid_level)
1.1       fvdl      396:
                    397:        /* Find out our CPU type. */
                    398:
                    399: try386:        /* Try to toggle alignment check flag; does not exist on 386. */
                    400:        pushfl
                    401:        popl    %eax
                    402:        movl    %eax,%ecx
                    403:        orl     $PSL_AC,%eax
                    404:        pushl   %eax
                    405:        popfl
                    406:        pushfl
                    407:        popl    %eax
                    408:        xorl    %ecx,%eax
                    409:        andl    $PSL_AC,%eax
                    410:        pushl   %ecx
                    411:        popfl
                    412:
                    413:        testl   %eax,%eax
                    414:        jnz     try486
                    415:
                    416:        /*
                    417:         * Try the test of a NexGen CPU -- ZF will not change on a DIV
                    418:         * instruction on a NexGen, it will on an i386.  Documented in
                    419:         * Nx586 Processor Recognition Application Note, NexGen, Inc.
                    420:         */
                    421:        movl    $0x5555,%eax
                    422:        xorl    %edx,%edx
                    423:        movl    $2,%ecx
                    424:        divl    %ecx
                    425:        jnz     is386
                    426:
                    427: isnx586:
                    428:        /*
                    429:         * Don't try cpuid, as Nx586s reportedly don't support the
                    430:         * PSL_ID bit.
                    431:         */
1.100     chs       432:        movl    $CPU_NX586,RELOC(cputype)
1.1       fvdl      433:        jmp     2f
                    434:
                    435: is386:
1.100     chs       436:        movl    $CPU_386,RELOC(cputype)
1.1       fvdl      437:        jmp     2f
                    438:
                    439: try486:        /* Try to toggle identification flag; does not exist on early 486s. */
                    440:        pushfl
                    441:        popl    %eax
                    442:        movl    %eax,%ecx
                    443:        xorl    $PSL_ID,%eax
                    444:        pushl   %eax
                    445:        popfl
                    446:        pushfl
                    447:        popl    %eax
                    448:        xorl    %ecx,%eax
                    449:        andl    $PSL_ID,%eax
                    450:        pushl   %ecx
                    451:        popfl
                    452:
                    453:        testl   %eax,%eax
                    454:        jnz     try586
1.100     chs       455: is486: movl    $CPU_486,RELOC(cputype)
1.1       fvdl      456:        /*
                    457:         * Check Cyrix CPU
                    458:         * Cyrix CPUs do not change the undefined flags following
                    459:         * execution of the divide instruction which divides 5 by 2.
                    460:         *
                    461:         * Note: CPUID is enabled on M2, so it passes another way.
                    462:         */
                    463:        pushfl
                    464:        movl    $0x5555, %eax
                    465:        xorl    %edx, %edx
                    466:        movl    $2, %ecx
                    467:        clc
                    468:        divl    %ecx
                    469:        jnc     trycyrix486
                    470:        popfl
                    471:        jmp 2f
                    472: trycyrix486:
1.115     maxv      473:        movl    $CPU_6x86,RELOC(cputype)        /* set CPU type */
1.1       fvdl      474:        /*
                    475:         * Check for Cyrix 486 CPU by seeing if the flags change during a
                    476:         * divide. This is documented in the Cx486SLC/e SMM Programmer's
                    477:         * Guide.
                    478:         */
                    479:        xorl    %edx,%edx
1.115     maxv      480:        cmpl    %edx,%edx               /* set flags to known state */
1.1       fvdl      481:        pushfl
1.115     maxv      482:        popl    %ecx                    /* store flags in ecx */
1.1       fvdl      483:        movl    $-1,%eax
                    484:        movl    $4,%ebx
1.115     maxv      485:        divl    %ebx                    /* do a long division */
1.1       fvdl      486:        pushfl
                    487:        popl    %eax
1.115     maxv      488:        xorl    %ecx,%eax               /* are the flags different? */
                    489:        testl   $0x8d5,%eax             /* only check C|PF|AF|Z|N|V */
                    490:        jne     2f                      /* yes; must be Cyrix 6x86 CPU */
                    491:        movl    $CPU_486DLC,RELOC(cputype)      /* set CPU type */
1.1       fvdl      492:
                    493: #ifndef CYRIX_CACHE_WORKS
                    494:        /* Disable caching of the ISA hole only. */
                    495:        invd
1.115     maxv      496:        movb    $CCR0,%al       /* Configuration Register index (CCR0) */
1.1       fvdl      497:        outb    %al,$0x22
                    498:        inb     $0x23,%al
                    499:        orb     $(CCR0_NC1|CCR0_BARB),%al
                    500:        movb    %al,%ah
                    501:        movb    $CCR0,%al
                    502:        outb    %al,$0x22
                    503:        movb    %ah,%al
                    504:        outb    %al,$0x23
                    505:        invd
                    506: #else /* CYRIX_CACHE_WORKS */
                    507:        /* Set cache parameters */
1.115     maxv      508:        invd                    /* Start with guaranteed clean cache */
                    509:        movb    $CCR0,%al       /* Configuration Register index (CCR0) */
1.1       fvdl      510:        outb    %al,$0x22
                    511:        inb     $0x23,%al
                    512:        andb    $~CCR0_NC0,%al
                    513: #ifndef CYRIX_CACHE_REALLY_WORKS
                    514:        orb     $(CCR0_NC1|CCR0_BARB),%al
                    515: #else
                    516:        orb     $CCR0_NC1,%al
                    517: #endif
                    518:        movb    %al,%ah
                    519:        movb    $CCR0,%al
                    520:        outb    %al,$0x22
                    521:        movb    %ah,%al
                    522:        outb    %al,$0x23
                    523:        /* clear non-cacheable region 1 */
                    524:        movb    $(NCR1+2),%al
                    525:        outb    %al,$0x22
                    526:        movb    $NCR_SIZE_0K,%al
                    527:        outb    %al,$0x23
                    528:        /* clear non-cacheable region 2 */
                    529:        movb    $(NCR2+2),%al
                    530:        outb    %al,$0x22
                    531:        movb    $NCR_SIZE_0K,%al
                    532:        outb    %al,$0x23
                    533:        /* clear non-cacheable region 3 */
                    534:        movb    $(NCR3+2),%al
                    535:        outb    %al,$0x22
                    536:        movb    $NCR_SIZE_0K,%al
                    537:        outb    %al,$0x23
                    538:        /* clear non-cacheable region 4 */
                    539:        movb    $(NCR4+2),%al
                    540:        outb    %al,$0x22
                    541:        movb    $NCR_SIZE_0K,%al
                    542:        outb    %al,$0x23
                    543:        /* enable caching in CR0 */
                    544:        movl    %cr0,%eax
                    545:        andl    $~(CR0_CD|CR0_NW),%eax
                    546:        movl    %eax,%cr0
                    547:        invd
                    548: #endif /* CYRIX_CACHE_WORKS */
                    549:
                    550:        jmp     2f
                    551:
                    552: try586:        /* Use the `cpuid' instruction. */
                    553:        xorl    %eax,%eax
                    554:        cpuid
1.73      ad        555:        movl    %eax,RELOC(cpuid_level)
1.1       fvdl      556:
1.122     maxv      557:        /*
                    558:         * Retrieve the NX/XD flag. We use the 32bit version of PG_NX.
                    559:         */
                    560:        movl    $0x80000001,%eax
                    561:        cpuid
                    562:        andl    $CPUID_NOX,%edx
                    563:        jz      no_NOX
                    564:        movl    $PG_NX32,RELOC(nox_flag)
                    565: no_NOX:
                    566:
1.1       fvdl      567: 2:
                    568:        /*
                    569:         * Finished with old stack; load new %esp now instead of later so we
                    570:         * can trace this code without having to worry about the trace trap
                    571:         * clobbering the memory test or the zeroing of the bss+bootstrap page
                    572:         * tables.
                    573:         *
                    574:         * The boot program should check:
                    575:         *      text+data <= &stack_variable - more_space_for_stack
                    576:         *      text+data+bss+pad+space_for_page_tables <= end_of_memory
1.115     maxv      577:         *
                    578:         * XXX: the gdt is in the carcass of the boot program so clearing
1.1       fvdl      579:         * the rest of memory is still not possible.
                    580:         */
1.115     maxv      581:        movl    $_RELOC(tmpstk),%esp
1.1       fvdl      582:
                    583: /*
1.117     maxv      584:  * There are two different layouts possible, depending on whether PAE is
                    585:  * enabled or not.
1.1       fvdl      586:  *
1.117     maxv      587:  * If PAE is not enabled, there are two levels of pages: PD -> PT. They will
                    588:  * be referred to as: L2 -> L1. L2 is 1 page long. The BOOTSTRAP TABLES have
                    589:  * the following layout:
                    590:  *     +-----+------------+----+
                    591:  *     | L2 -> PROC0 STK -> L1 |
                    592:  *     +-----+------------+----+
                    593:  *
                    594:  * If PAE is enabled, there are three levels of pages: PDP -> PD -> PT. They
                    595:  * will be referred to as: L3 -> L2 -> L1. L3 is 1 page long, L2 is 4 page
                    596:  * long. The BOOTSTRAP TABLES have the following layout:
                    597:  *     +-----+-----+------------+----+
                    598:  *     | L3 -> L2 -> PROC0 STK -> L1 |
                    599:  *     +-----+-----+------------+----+
                    600:  *
                    601:  * Virtual address space of the kernel in both cases:
                    602:  * +------+--------+------+-----+--------+---------------------+-----------
                    603:  * | TEXT | RODATA | DATA | BSS | [SYMS] | [PRELOADED MODULES] | BOOTSTRAP
                    604:  * +------+--------+------+-----+--------+---------------------+-----------
                    605:  *                             (1)      (2)                   (3)
                    606:  *
                    607:  * -------+------------+
                    608:  * TABLES | ISA IO MEM |
                    609:  * -------+------------+
                    610:  *       (4)
1.93      jym       611:  *
1.117     maxv      612:  * PROC0 STK is obviously not linked as a page level. It just happens to be
                    613:  * caught between L2 and L1.
1.123     maxv      614:  *
                    615:  * Important note: the kernel segments are properly 4k-aligned
                    616:  * (see kern.ldscript), so there's no need to enforce alignment.
1.1       fvdl      617:  */
                    618:
1.117     maxv      619:        /* Find end of kernel image; brings us on (1). */
1.1       fvdl      620:        movl    $RELOC(end),%edi
1.71      ad        621:
1.114     uebayasi  622: #if (NKSYMS || defined(DDB) || defined(MODULAR)) && !defined(makeoptions_COPY_SYMTAB)
1.117     maxv      623:        /* Save the symbols (if loaded); brinds us on (2). */
1.1       fvdl      624:        movl    RELOC(esym),%eax
                    625:        testl   %eax,%eax
                    626:        jz      1f
1.35      yamt      627:        subl    $KERNBASE,%eax
1.1       fvdl      628:        movl    %eax,%edi
                    629: 1:
                    630: #endif
                    631:
1.117     maxv      632:        /* Skip over any modules/blobs; brings us on (3). */
1.71      ad        633:        movl    RELOC(eblob),%eax
                    634:        testl   %eax,%eax
                    635:        jz      1f
                    636:        subl    $KERNBASE,%eax
                    637:        movl    %eax,%edi
                    638: 1:
1.117     maxv      639:
                    640:        /* We are on (3). Align up for BOOTSTRAP TABLES. */
1.71      ad        641:        movl    %edi,%esi
1.115     maxv      642:        addl    $PGOFSET,%esi
1.1       fvdl      643:        andl    $~PGOFSET,%esi
                    644:
1.53      yamt      645:        /* nkptp[1] = (esi + ~L2_FRAME) >> L2_SHIFT + 1; */
                    646:        movl    %esi,%eax
                    647:        addl    $~L2_FRAME,%eax
                    648:        shrl    $L2_SHIFT,%eax
1.117     maxv      649:        incl    %eax            /* one more PTP for VAs stolen by bootstrap */
1.53      yamt      650: 1:     movl    %eax,RELOC(nkptp)+1*4
                    651:
1.93      jym       652:        /* tablesize = (PDP_SIZE + UPAGES + nkptp) << PGSHIFT; */
                    653:        addl    $(PDP_SIZE+UPAGES),%eax
                    654: #ifdef PAE
1.117     maxv      655:        incl    %eax            /* one more page for L3 */
1.93      jym       656:        shll    $PGSHIFT+1,%eax /* PTP tables are twice larger with PAE */
                    657: #else
1.53      yamt      658:        shll    $PGSHIFT,%eax
1.93      jym       659: #endif
1.53      yamt      660:        movl    %eax,RELOC(tablesize)
                    661:
1.117     maxv      662:        /* Ensure that nkptp covers BOOTSTRAP TABLES. */
1.53      yamt      663:        addl    %esi,%eax
                    664:        addl    $~L2_FRAME,%eax
                    665:        shrl    $L2_SHIFT,%eax
                    666:        incl    %eax
                    667:        cmpl    %eax,RELOC(nkptp)+1*4
                    668:        jnz     1b
                    669:
1.117     maxv      670:        /* Now, zero out the BOOTSTRAP TABLES (before filling them in). */
1.105     uebayasi  671:        movl    %esi,%edi
1.1       fvdl      672:        xorl    %eax,%eax
                    673:        cld
1.105     uebayasi  674:        movl    RELOC(tablesize),%ecx
                    675:        shrl    $2,%ecx
1.1       fvdl      676:        rep
1.117     maxv      677:        stosl                           /* copy eax -> edi */
1.1       fvdl      678:
                    679: /*
1.117     maxv      680:  * Build the page tables and levels. We go from L1 to L2/L3, and link the levels
                    681:  * together. Note: RELOC computes &addr - KERNBASE in 32 bits; the value can't
                    682:  * be > 4G, or we can't deal with it anyway, since we are in 32bit mode.
1.1       fvdl      683:  */
1.105     uebayasi  684:        /*
1.117     maxv      685:         * Build L1.
1.105     uebayasi  686:         */
1.117     maxv      687:        leal    (PROC0_PTP1_OFF)(%esi),%ebx
                    688:
                    689:        /* Skip the first MB. */
1.118     maxv      690:        movl    $(KERNTEXTOFF - KERNBASE),%eax
1.1       fvdl      691:        movl    %eax,%ecx
1.117     maxv      692:        shrl    $(PGSHIFT-2),%ecx       /* ((n >> PGSHIFT) << 2) for # PDEs */
1.93      jym       693: #ifdef PAE
1.117     maxv      694:        shll    $1,%ecx                 /* PDEs are twice larger with PAE */
1.93      jym       695: #endif
1.105     uebayasi  696:        addl    %ecx,%ebx
1.1       fvdl      697:
1.121     maxv      698:        /* Map the kernel text RX. */
                    699:        movl    $RELOC(__rodata_start),%ecx
1.1       fvdl      700:        subl    %eax,%ecx
                    701:        shrl    $PGSHIFT,%ecx
                    702:        orl     $(PG_V|PG_KR),%eax
                    703:        fillkpt
                    704:
1.121     maxv      705:        /* Map the kernel rodata R. */
                    706:        movl    $RELOC(__rodata_start),%eax
                    707:        movl    $RELOC(__data_start),%ecx
                    708:        subl    %eax,%ecx
                    709:        shrl    $PGSHIFT,%ecx
                    710:        orl     $(PG_V|PG_KR),%eax
                    711:        fillkpt_nox
                    712:
                    713:        /* Map the kernel data+bss RW. */
                    714:        movl    $RELOC(__data_start),%eax
                    715:        movl    $RELOC(__kernel_end),%ecx
                    716:        subl    %eax,%ecx
1.1       fvdl      717:        shrl    $PGSHIFT,%ecx
1.121     maxv      718:        orl     $(PG_V|PG_KW),%eax
                    719:        fillkpt_nox
                    720:
1.124   ! maxv      721:        /* Map [SYMS]+[PRELOADED MODULES] RWX. */
1.121     maxv      722:        movl    $RELOC(__kernel_end),%eax
                    723:        movl    %esi,%ecx               /* start of BOOTSTRAP TABLES */
1.124   ! maxv      724:        subl    %eax,%ecx
1.121     maxv      725:        shrl    $PGSHIFT,%ecx
                    726:        orl     $(PG_V|PG_KW),%eax
1.1       fvdl      727:        fillkpt
                    728:
1.124   ! maxv      729:        /* Map the BOOTSTRAP TABLES RW. */
        !           730:        movl    %esi,%eax               /* start of BOOTSTRAP TABLES */
        !           731:        movl    RELOC(tablesize),%ecx   /* length of BOOTSTRAP TABLES */
        !           732:        shrl    $PGSHIFT,%ecx
        !           733:        orl     $(PG_V|PG_KW),%eax
        !           734:        fillkpt_nox
        !           735:
1.123     maxv      736:        /* We are on (4). Map ISA I/O mem (later atdevbase) RWX. */
1.115     maxv      737:        movl    $(IOM_BEGIN|PG_V|PG_KW/*|PG_N*/),%eax
                    738:        movl    $(IOM_SIZE>>PGSHIFT),%ecx
1.1       fvdl      739:        fillkpt
                    740:
1.117     maxv      741:        /*
                    742:         * Build L2 for identity mapping. Linked to L1.
                    743:         */
1.105     uebayasi  744:        leal    (PROC0_PDIR_OFF)(%esi),%ebx
                    745:        leal    (PROC0_PTP1_OFF)(%esi),%eax
1.117     maxv      746:        orl     $(PG_V|PG_KW),%eax
1.105     uebayasi  747:        movl    RELOC(nkptp)+1*4,%ecx
1.1       fvdl      748:        fillkpt
                    749:
1.117     maxv      750:        /* Set up L2 entries for actual kernel mapping */
                    751:        leal    (PROC0_PDIR_OFF + L2_SLOT_KERNBASE * PDE_SIZE)(%esi),%ebx
1.105     uebayasi  752:        leal    (PROC0_PTP1_OFF)(%esi),%eax
1.117     maxv      753:        orl     $(PG_V|PG_KW),%eax
1.105     uebayasi  754:        movl    RELOC(nkptp)+1*4,%ecx
1.1       fvdl      755:        fillkpt
                    756:
                    757:        /* Install a PDE recursively mapping page directory as a page table! */
1.117     maxv      758:        leal    (PROC0_PDIR_OFF + PDIR_SLOT_PTE * PDE_SIZE)(%esi),%ebx
1.105     uebayasi  759:        leal    (PROC0_PDIR_OFF)(%esi),%eax
                    760:        orl     $(PG_V|PG_KW),%eax
1.93      jym       761:        movl    $PDP_SIZE,%ecx
                    762:        fillkpt
                    763:
                    764: #ifdef PAE
1.117     maxv      765:        /*
                    766:         * Build L3. Linked to L2.
                    767:         */
1.93      jym       768:        leal    (PROC0_L3_OFF)(%esi),%ebx
                    769:        leal    (PROC0_PDIR_OFF)(%esi),%eax
                    770:        orl     $(PG_V),%eax
                    771:        movl    $PDP_SIZE,%ecx
                    772:        fillkpt
                    773:
                    774:        /* Enable PAE mode */
                    775:        movl    %cr4,%eax
                    776:        orl     $CR4_PAE,%eax
                    777:        movl    %eax,%cr4
                    778: #endif
1.1       fvdl      779:
1.117     maxv      780:        /* Save physical address of L2. */
1.93      jym       781:        leal    (PROC0_PDIR_OFF)(%esi),%eax
                    782:        movl    %eax,RELOC(PDPpaddr)
1.1       fvdl      783:
1.93      jym       784:        /*
                    785:         * Startup checklist:
1.117     maxv      786:         * 1. Load %cr3 with pointer to L2 (or L3 for PAE).
1.93      jym       787:         */
1.117     maxv      788:        movl    %esi,%eax
                    789:        movl    %eax,%cr3
1.93      jym       790:
1.105     uebayasi  791:        /*
1.119     maxv      792:         * 2. Set NOX in EFER, if available.
                    793:         */
                    794:        movl    RELOC(nox_flag),%ebx
                    795:        cmpl    $0,%ebx
                    796:        je      skip_NOX
                    797:        movl    $MSR_EFER,%ecx
                    798:        rdmsr
                    799:        xorl    %eax,%eax
                    800:        orl     $(EFER_NXE),%eax
                    801:        wrmsr
                    802: skip_NOX:
                    803:
                    804:        /*
                    805:         * 3. Enable paging and the rest of it.
1.105     uebayasi  806:         */
1.115     maxv      807:        movl    %cr0,%eax
1.111     dsl       808:        orl     $(CR0_PE|CR0_PG|CR0_NE|CR0_TS|CR0_MP|CR0_WP|CR0_AM),%eax
1.115     maxv      809:        movl    %eax,%cr0
1.1       fvdl      810:
1.115     maxv      811:        pushl   $begin                  /* jump to high mem */
1.1       fvdl      812:        ret
                    813:
                    814: begin:
1.105     uebayasi  815:        /*
1.117     maxv      816:         * We have arrived. There's no need anymore for the identity mapping in
                    817:         * low memory, remove it.
1.105     uebayasi  818:         */
                    819:        movl    _C_LABEL(nkptp)+1*4,%ecx
1.115     maxv      820:        leal    (PROC0_PDIR_OFF)(%esi),%ebx     /* old, phys address of PDIR */
                    821:        addl    $(KERNBASE), %ebx               /* new, virt address of PDIR */
1.118     maxv      822:        killkpt
1.1       fvdl      823:
                    824:        /* Relocate atdevbase. */
1.53      yamt      825:        movl    $KERNBASE,%edx
                    826:        addl    _C_LABEL(tablesize),%edx
1.1       fvdl      827:        addl    %esi,%edx
                    828:        movl    %edx,_C_LABEL(atdevbase)
                    829:
                    830:        /* Set up bootstrap stack. */
1.105     uebayasi  831:        leal    (PROC0_STK_OFF+KERNBASE)(%esi),%eax
1.91      rmind     832:        movl    %eax,_C_LABEL(lwp0uarea)
1.112     dsl       833:        leal    (USPACE-FRAMESIZE)(%eax),%esp
1.115     maxv      834:        movl    %esi,PCB_CR3(%eax)      /* pcb->pcb_cr3 */
                    835:        xorl    %ebp,%ebp               /* mark end of frames */
1.1       fvdl      836:
1.37      jmmv      837: #if defined(MULTIBOOT)
                    838:        /* It is now safe to parse the Multiboot information structure
                    839:         * we saved before from C code.  Note that we cannot delay its
                    840:         * parsing any more because initgdt (called below) needs to make
                    841:         * use of this information. */
                    842:        call    _C_LABEL(multiboot_post_reloc)
                    843: #endif
                    844:
1.115     maxv      845:        subl    $NGDT*8, %esp           /* space for temporary gdt */
1.1       fvdl      846:        pushl   %esp
                    847:        call    _C_LABEL(initgdt)
                    848:        addl    $4,%esp
1.30      junyoung  849:
1.105     uebayasi  850:        movl    _C_LABEL(tablesize),%eax
1.115     maxv      851:        addl    %esi,%eax               /* skip past stack and page tables */
1.1       fvdl      852:
1.93      jym       853: #ifdef PAE
1.115     maxv      854:        pushl   $0      /* init386() expects a 64 bits paddr_t with PAE */
1.93      jym       855: #endif
1.1       fvdl      856:        pushl   %eax
1.115     maxv      857:        call    _C_LABEL(init386)       /* wire 386 chip for unix operation */
                    858:        addl    $PDE_SIZE,%esp          /* pop paddr_t */
                    859:        addl    $NGDT*8,%esp            /* pop temporary gdt */
1.1       fvdl      860:
                    861: #ifdef SAFARI_FIFO_HACK
                    862:        movb    $5,%al
                    863:        movw    $0x37b,%dx
                    864:        outb    %al,%dx
                    865:        movw    $0x37f,%dx
                    866:        inb     %dx,%al
                    867:        movb    %al,%cl
                    868:
                    869:        orb     $1,%cl
                    870:
                    871:        movb    $5,%al
                    872:        movw    $0x37b,%dx
                    873:        outb    %al,%dx
                    874:        movw    $0x37f,%dx
                    875:        movb    %cl,%al
                    876:        outb    %al,%dx
                    877: #endif /* SAFARI_FIFO_HACK */
                    878:
                    879:        call    _C_LABEL(main)
1.62      bouyer    880: #else /* XEN */
                    881:        /* First, reset the PSL. */
                    882:        pushl   $PSL_MBO
                    883:        popfl
                    884:
                    885:        cld
1.115     maxv      886:        movl    %esp, %ebx              /* save start of available space */
                    887:        movl    $_RELOC(tmpstk),%esp    /* bootstrap stack end location */
1.62      bouyer    888:
1.106     uebayasi  889:        /* Clear BSS. */
1.62      bouyer    890:        xorl    %eax,%eax
                    891:        movl    $RELOC(__bss_start),%edi
                    892:        movl    $RELOC(_end),%ecx
                    893:        subl    %edi,%ecx
                    894:        rep stosb
                    895:
                    896:        /* Copy the necessary stuff from start_info structure. */
1.105     uebayasi  897:        /* We need to copy shared_info early, so that sti/cli work */
1.62      bouyer    898:        movl    $RELOC(start_info_union),%edi
                    899:        movl    $128,%ecx
                    900:        rep movsl
                    901:
                    902:        /* Clear segment registers; always null in proc0. */
                    903:        xorl    %eax,%eax
                    904:        movw    %ax,%fs
                    905:        movw    %ax,%gs
                    906:        decl    %eax
1.73      ad        907:        movl    %eax,RELOC(cpuid_level)
1.62      bouyer    908:
                    909:        xorl    %eax,%eax
                    910:        cpuid
1.73      ad        911:        movl    %eax,RELOC(cpuid_level)
1.62      bouyer    912:
1.96      cherry    913:        /*
                    914:         * Use a temp page. We'll re- add it to uvm(9) once we're
                    915:         * done using it.
                    916:         */
                    917:        movl    $RELOC(tmpgdt), %eax
1.115     maxv      918:        pushl   %eax            /* start of temporary gdt */
1.96      cherry    919:        call    _C_LABEL(initgdt)
                    920:        addl    $4,%esp
                    921:
1.62      bouyer    922:        call    xen_pmap_bootstrap
1.92      jym       923:
1.62      bouyer    924:        /*
                    925:         * First avail returned by xen_pmap_bootstrap in %eax
                    926:         */
                    927:        movl    %eax, %esi;
1.91      rmind     928:        movl    %esi, _C_LABEL(lwp0uarea)
1.62      bouyer    929:
                    930:        /* Set up bootstrap stack. */
1.112     dsl       931:        leal    (USPACE-FRAMESIZE)(%eax),%esp
1.115     maxv      932:        xorl    %ebp,%ebp               /* mark end of frames */
1.62      bouyer    933:
                    934:        addl    $USPACE, %esi
1.115     maxv      935:        subl    $KERNBASE, %esi         /* init386 wants a physical address */
1.92      jym       936:
                    937: #ifdef PAE
1.115     maxv      938:        pushl   $0      /* init386() expects a 64 bits paddr_t with PAE */
1.92      jym       939: #endif
1.62      bouyer    940:        pushl   %esi
1.115     maxv      941:        call    _C_LABEL(init386)       /* wire 386 chip for unix operation */
                    942:        addl    $PDE_SIZE,%esp          /* pop paddr_t */
1.62      bouyer    943:        call    _C_LABEL(main)
1.106     uebayasi  944: #endif /* XEN */
1.104     uebayasi  945: END(start)
1.62      bouyer    946:
1.101     jym       947: #if defined(XEN)
1.62      bouyer    948: /* space for the hypercall call page */
                    949: #define HYPERCALL_PAGE_OFFSET 0x1000
                    950: .org HYPERCALL_PAGE_OFFSET
                    951: ENTRY(hypercall_page)
                    952: .skip 0x1000
1.104     uebayasi  953: END(hypercall_page)
1.62      bouyer    954:
                    955: /*
                    956:  * void lgdt_finish(void);
                    957:  * Finish load a new GDT pointer (do any necessary cleanup).
                    958:  * XXX It's somewhat questionable whether reloading all the segment registers
                    959:  * is necessary, since the actual descriptor data is not changed except by
                    960:  * process creation and exit, both of which clean up via task switches.  OTOH,
                    961:  * this only happens at run time when the GDT is resized.
                    962:  */
                    963: /* LINTSTUB: Func: void lgdt_finish(void) */
                    964: NENTRY(lgdt_finish)
                    965:        movl    $GSEL(GDATA_SEL, SEL_KPL),%eax
                    966:        movw    %ax,%ds
                    967:        movw    %ax,%es
                    968:        movw    %ax,%gs
                    969:        movw    %ax,%ss
                    970:        movl    $GSEL(GCPU_SEL, SEL_KPL),%eax
                    971:        movw    %ax,%fs
                    972:        /* Reload code selector by doing intersegment return. */
                    973:        popl    %eax
                    974:        pushl   $GSEL(GCODE_SEL, SEL_KPL)
                    975:        pushl   %eax
                    976:        lret
1.72      yamt      977: END(lgdt_finish)
1.62      bouyer    978:
                    979: #endif /* XEN */
1.1       fvdl      980:
                    981: /*
1.48      yamt      982:  * void lwp_trampoline(void);
                    983:  *
1.1       fvdl      984:  * This is a trampoline function pushed onto the stack of a newly created
                    985:  * process in order to do some additional setup.  The trampoline is entered by
1.109     christos  986:  * cpu_switchto()ing to the process, so we abuse the callee-saved
                    987:  * registers used by cpu_switchto() to store the information about the
                    988:  * stub to call.
1.1       fvdl      989:  * NOTE: This function does not have a normal calling sequence!
                    990:  */
1.48      yamt      991: NENTRY(lwp_trampoline)
1.68      ad        992:        movl    %ebp,%edi       /* for .Lsyscall_checkast */
1.48      yamt      993:        xorl    %ebp,%ebp
1.68      ad        994:        pushl   %edi
1.48      yamt      995:        pushl   %eax
                    996:        call    _C_LABEL(lwp_startup)
                    997:        addl    $8,%esp
1.1       fvdl      998:        pushl   %ebx
                    999:        call    *%esi
                   1000:        addl    $4,%esp
1.68      ad       1001:        jmp     .Lsyscall_checkast
1.1       fvdl     1002:        /* NOTREACHED */
1.72      yamt     1003: END(lwp_trampoline)
1.1       fvdl     1004:
                   1005: /*
1.48      yamt     1006:  * sigcode()
                   1007:  *
                   1008:  * Signal trampoline; copied to top of user stack.  Used only for
                   1009:  * compatibility with old releases of NetBSD.
1.1       fvdl     1010:  */
                   1011: NENTRY(sigcode)
                   1012:        /*
                   1013:         * Handler has returned here as if we called it.  The sigcontext
                   1014:         * is on the stack after the 3 args "we" pushed.
                   1015:         */
1.115     maxv     1016:        leal    12(%esp),%eax           /* get pointer to sigcontext */
                   1017:        movl    %eax,4(%esp)            /* put it in the argument slot */
                   1018:                                        /* fake return address already there */
1.17      christos 1019:        movl    $SYS_compat_16___sigreturn14,%eax
1.115     maxv     1020:        int     $0x80                   /* enter kernel with args on stack */
1.1       fvdl     1021:        movl    $SYS_exit,%eax
1.115     maxv     1022:        int     $0x80                   /* exit if sigreturn fails */
1.1       fvdl     1023:        .globl  _C_LABEL(esigcode)
                   1024: _C_LABEL(esigcode):
1.72      yamt     1025: END(sigcode)
1.1       fvdl     1026:
                   1027: /*
1.48      yamt     1028:  * int setjmp(label_t *)
                   1029:  *
                   1030:  * Used primarily by DDB.
1.1       fvdl     1031:  */
                   1032: ENTRY(setjmp)
                   1033:        movl    4(%esp),%eax
1.115     maxv     1034:        movl    %ebx,(%eax)             /* save ebx */
                   1035:        movl    %esp,4(%eax)            /* save esp */
                   1036:        movl    %ebp,8(%eax)            /* save ebp */
                   1037:        movl    %esi,12(%eax)           /* save esi */
                   1038:        movl    %edi,16(%eax)           /* save edi */
                   1039:        movl    (%esp),%edx             /* get rta */
                   1040:        movl    %edx,20(%eax)           /* save eip */
                   1041:        xorl    %eax,%eax               /* return 0 */
1.1       fvdl     1042:        ret
1.72      yamt     1043: END(setjmp)
1.1       fvdl     1044:
1.48      yamt     1045: /*
                   1046:  * int longjmp(label_t *)
                   1047:  *
                   1048:  * Used primarily by DDB.
                   1049:  */
1.1       fvdl     1050: ENTRY(longjmp)
                   1051:        movl    4(%esp),%eax
1.115     maxv     1052:        movl    (%eax),%ebx             /* restore ebx */
                   1053:        movl    4(%eax),%esp            /* restore esp */
                   1054:        movl    8(%eax),%ebp            /* restore ebp */
                   1055:        movl    12(%eax),%esi           /* restore esi */
                   1056:        movl    16(%eax),%edi           /* restore edi */
                   1057:        movl    20(%eax),%edx           /* get rta */
                   1058:        movl    %edx,(%esp)             /* put in return frame */
                   1059:        movl    $1,%eax                 /* return 1 */
1.1       fvdl     1060:        ret
1.72      yamt     1061: END(longjmp)
1.1       fvdl     1062:
1.65      skrll    1063: /*
                   1064:  * void dumpsys(void)
                   1065:  *
                   1066:  * Mimic cpu_switchto() for postmortem debugging.
                   1067:  */
1.64      skrll    1068: ENTRY(dumpsys)
1.115     maxv     1069:        pushl   %ebx                    /* set up fake switchframe */
                   1070:        pushl   %esi                    /* and save context */
                   1071:        pushl   %edi
1.65      skrll    1072:        movl    %esp,_C_LABEL(dumppcb)+PCB_ESP
                   1073:        movl    %ebp,_C_LABEL(dumppcb)+PCB_EBP
1.115     maxv     1074:        call    _C_LABEL(dodumpsys)     /* dump! */
                   1075:        addl    $(3*4), %esp            /* unwind switchframe */
1.64      skrll    1076:        ret
1.72      yamt     1077: END(dumpsys)
1.64      skrll    1078:
1.1       fvdl     1079: /*
1.106     uebayasi 1080:  * struct lwp *cpu_switchto(struct lwp *oldlwp, struct lwp *newlwp,
1.58      ad       1081:  *                         bool returning)
1.30      junyoung 1082:  *
1.48      yamt     1083:  *     1. if (oldlwp != NULL), save its context.
                   1084:  *     2. then, restore context of newlwp.
                   1085:  *
                   1086:  * Note that the stack frame layout is known to "struct switchframe" in
                   1087:  * <machine/frame.h> and to the code in cpu_lwp_fork() which initializes
1.5       thorpej  1088:  * it for a new lwp.
1.1       fvdl     1089:  */
1.48      yamt     1090: ENTRY(cpu_switchto)
1.1       fvdl     1091:        pushl   %ebx
                   1092:        pushl   %esi
                   1093:        pushl   %edi
                   1094:
1.70      ad       1095: #if defined(DIAGNOSTIC) && !defined(XEN)
                   1096:        cmpl    $IPL_SCHED,CPUVAR(ILEVEL)
                   1097:        jbe     0f
1.74      christos 1098:        pushl   CPUVAR(ILEVEL)
1.70      ad       1099:        pushl   $.Lstr
                   1100:        call    _C_LABEL(panic)
1.74      christos 1101:        addl    $8,%esp
                   1102: .Lstr: .string "cpu_switchto: switching above IPL_SCHED (%d)\0"
1.70      ad       1103: 0:
                   1104: #endif
                   1105:
1.115     maxv     1106:        movl    16(%esp),%esi           /* oldlwp */
                   1107:        movl    20(%esp),%edi           /* newlwp */
                   1108:        movl    24(%esp),%edx           /* returning */
1.48      yamt     1109:        testl   %esi,%esi
                   1110:        jz      1f
1.1       fvdl     1111:
1.48      yamt     1112:        /* Save old context. */
1.91      rmind    1113:        movl    L_PCB(%esi),%eax
1.48      yamt     1114:        movl    %esp,PCB_ESP(%eax)
                   1115:        movl    %ebp,PCB_EBP(%eax)
                   1116:
                   1117:        /* Switch to newlwp's stack. */
1.91      rmind    1118: 1:     movl    L_PCB(%edi),%ebx
1.48      yamt     1119:        movl    PCB_EBP(%ebx),%ebp
                   1120:        movl    PCB_ESP(%ebx),%esp
1.1       fvdl     1121:
1.61      ad       1122:        /*
                   1123:         * Set curlwp.  This must be globally visible in order to permit
                   1124:         * non-interlocked mutex release.
                   1125:         */
                   1126:        movl    %edi,%ecx
                   1127:        xchgl   %ecx,CPUVAR(CURLWP)
1.58      ad       1128:
                   1129:        /* Skip the rest if returning to a pinned LWP. */
                   1130:        testl   %edx,%edx
                   1131:        jnz     4f
                   1132:
1.62      bouyer   1133: #ifdef XEN
                   1134:        pushl   %edi
                   1135:        call    _C_LABEL(i386_switch_context)
                   1136:        addl    $4,%esp
1.97      bouyer   1137: #else /* !XEN */
1.60      yamt     1138:        /* Switch ring0 esp */
                   1139:        movl    PCB_ESP0(%ebx),%eax
                   1140:        movl    %eax,CPUVAR(ESP0)
1.97      bouyer   1141: #endif /* !XEN */
1.1       fvdl     1142:
                   1143:        /* Don't bother with the rest if switching to a system process. */
1.48      yamt     1144:        testl   $LW_SYSTEM,L_FLAG(%edi)
                   1145:        jnz     4f
1.1       fvdl     1146:
1.97      bouyer   1147: #ifndef XEN
1.54      ad       1148:        /* Restore thread-private %fs/%gs descriptors. */
1.60      yamt     1149:        movl    CPUVAR(GDT),%ecx
1.55      ad       1150:        movl    PCB_FSD(%ebx), %eax
                   1151:        movl    PCB_FSD+4(%ebx), %edx
1.54      ad       1152:        movl    %eax, (GUFS_SEL*8)(%ecx)
                   1153:        movl    %edx, (GUFS_SEL*8+4)(%ecx)
1.55      ad       1154:        movl    PCB_GSD(%ebx), %eax
                   1155:        movl    PCB_GSD+4(%ebx), %edx
1.54      ad       1156:        movl    %eax, (GUGS_SEL*8)(%ecx)
                   1157:        movl    %edx, (GUGS_SEL*8+4)(%ecx)
1.97      bouyer   1158: #endif /* !XEN */
1.54      ad       1159:
1.60      yamt     1160:        /* Switch I/O bitmap */
                   1161:        movl    PCB_IOMAP(%ebx),%eax
                   1162:        orl     %eax,%eax
1.95      joerg    1163:        jnz     .Lcopy_iobitmap
1.60      yamt     1164:        movl    $(IOMAP_INVALOFF << 16),CPUVAR(IOBASE)
                   1165: .Liobitmap_done:
                   1166:
1.56      ad       1167:        /* Is this process using RAS (restartable atomic sequences)? */
                   1168:        movl    L_PROC(%edi),%eax
                   1169:        cmpl    $0,P_RASLIST(%eax)
                   1170:        jne     5f
                   1171:
1.48      yamt     1172:        /*
1.90      rmind    1173:         * Restore cr0 (including FPU state).  Raise the IPL to IPL_HIGH.
1.48      yamt     1174:         * FPU IPIs can alter the LWP's saved cr0.  Dropping the priority
                   1175:         * is deferred until mi_switch(), when cpu_switchto() returns.
                   1176:         */
1.62      bouyer   1177: 2:
1.97      bouyer   1178: #ifdef XEN
                   1179:        pushl   %edi
                   1180:        call    _C_LABEL(i386_tls_switch)
                   1181:        addl    $4,%esp
                   1182: #else /* !XEN */
1.108     christos 1183:        movl    $IPL_HIGH,CPUVAR(ILEVEL)
                   1184:        movl    PCB_CR0(%ebx),%ecx              /* has CR0_TS clear */
1.48      yamt     1185:        movl    %cr0,%edx
1.1       fvdl     1186:
1.108     christos 1187:        /*
                   1188:         * If our floating point registers are on a different CPU,
                   1189:         * set CR0_TS so we'll trap rather than reuse bogus state.
                   1190:         */
                   1191:        cmpl    CPUVAR(FPCURLWP),%edi
                   1192:        je      3f
                   1193:        orl     $CR0_TS,%ecx
                   1194:
1.48      yamt     1195:        /* Reloading CR0 is very expensive - avoid if possible. */
1.108     christos 1196: 3:     cmpl    %edx,%ecx
1.48      yamt     1197:        je      4f
1.1       fvdl     1198:        movl    %ecx,%cr0
1.97      bouyer   1199: #endif /* !XEN */
1.1       fvdl     1200:
1.48      yamt     1201:        /* Return to the new LWP, returning 'oldlwp' in %eax. */
                   1202: 4:     movl    %esi,%eax
1.1       fvdl     1203:        popl    %edi
                   1204:        popl    %esi
                   1205:        popl    %ebx
                   1206:        ret
1.20      dsl      1207:
1.48      yamt     1208:        /* Check for restartable atomic sequences (RAS). */
                   1209: 5:     movl    L_MD_REGS(%edi),%ecx
                   1210:        pushl   TF_EIP(%ecx)
1.20      dsl      1211:        pushl   %eax
                   1212:        call    _C_LABEL(ras_lookup)
                   1213:        addl    $8,%esp
                   1214:        cmpl    $-1,%eax
1.48      yamt     1215:        je      2b
1.49      ad       1216:        movl    L_MD_REGS(%edi),%ecx
                   1217:        movl    %eax,TF_EIP(%ecx)
1.48      yamt     1218:        jmp     2b
1.1       fvdl     1219:
1.60      yamt     1220: .Lcopy_iobitmap:
                   1221:        /* Copy I/O bitmap. */
1.86      ad       1222:        incl    _C_LABEL(pmap_iobmp_evcnt)+EV_COUNT
1.60      yamt     1223:        movl    $(IOMAPSIZE/4),%ecx
                   1224:        pushl   %esi
                   1225:        pushl   %edi
                   1226:        movl    %eax,%esi               /* pcb_iomap */
                   1227:        movl    CPUVAR(SELF),%edi
                   1228:        leal    CPU_INFO_IOMAP(%edi),%edi
                   1229:        rep
                   1230:        movsl
                   1231:        popl    %edi
                   1232:        popl    %esi
                   1233:        movl    $((CPU_INFO_IOMAP - CPU_INFO_TSS) << 16),CPUVAR(IOBASE)
                   1234:        jmp     .Liobitmap_done
1.72      yamt     1235: END(cpu_switchto)
1.60      yamt     1236:
1.1       fvdl     1237: /*
                   1238:  * void savectx(struct pcb *pcb);
1.48      yamt     1239:  *
1.1       fvdl     1240:  * Update pcb, saving current processor state.
                   1241:  */
                   1242: ENTRY(savectx)
1.115     maxv     1243:        movl    4(%esp),%edx            /* edx = pcb */
1.1       fvdl     1244:        movl    %esp,PCB_ESP(%edx)
                   1245:        movl    %ebp,PCB_EBP(%edx)
                   1246:        ret
1.72      yamt     1247: END(savectx)
1.1       fvdl     1248:
                   1249: /*
1.48      yamt     1250:  * osyscall()
                   1251:  *
1.1       fvdl     1252:  * Old call gate entry for syscall
                   1253:  */
                   1254: IDTVEC(osyscall)
1.87      ad       1255: #ifndef XEN
                   1256:        /* XXX we are in trouble! interrupts be off here. */
1.115     maxv     1257:        cli                     /* must be first instruction */
1.87      ad       1258: #endif
1.115     maxv     1259:        pushfl                  /* set eflags in trap frame */
1.1       fvdl     1260:        popl    8(%esp)
1.115     maxv     1261:        orl     $PSL_I,8(%esp)  /* re-enable ints on return to user */
                   1262:        pushl   $7              /* size of instruction for restart */
1.1       fvdl     1263:        jmp     syscall1
1.72      yamt     1264: IDTVEC_END(osyscall)
1.1       fvdl     1265:
                   1266: /*
1.48      yamt     1267:  * syscall()
                   1268:  *
1.1       fvdl     1269:  * Trap gate entry for syscall
                   1270:  */
                   1271: IDTVEC(syscall)
1.115     maxv     1272:        pushl   $2              /* size of instruction for restart */
1.1       fvdl     1273: syscall1:
1.115     maxv     1274:        pushl   $T_ASTFLT       /* trap # for doing ASTs */
1.1       fvdl     1275:        INTRENTRY
1.85      ad       1276:        STI(%eax)
1.1       fvdl     1277: #ifdef DIAGNOSTIC
                   1278:        movl    CPUVAR(ILEVEL),%ebx
                   1279:        testl   %ebx,%ebx
                   1280:        jz      1f
                   1281:        pushl   $5f
1.84      ad       1282:        call    _C_LABEL(panic)
1.1       fvdl     1283:        addl    $4,%esp
                   1284: #ifdef DDB
                   1285:        int     $3
                   1286: #endif
1.30      junyoung 1287: 1:
1.1       fvdl     1288: #endif /* DIAGNOSTIC */
1.115     maxv     1289:        addl    $1,CPUVAR(NSYSCALL)     /* count it atomically */
                   1290:        adcl    $0,CPUVAR(NSYSCALL)+4   /* count it atomically */
1.68      ad       1291:        movl    CPUVAR(CURLWP),%edi
                   1292:        movl    L_PROC(%edi),%edx
1.115     maxv     1293:        movl    %esp,L_MD_REGS(%edi)    /* save pointer to frame */
1.15      fvdl     1294:        pushl   %esp
1.115     maxv     1295:        call    *P_MD_SYSCALL(%edx)     /* get pointer to syscall() function */
1.15      fvdl     1296:        addl    $4,%esp
1.27      yamt     1297: .Lsyscall_checkast:
1.24      yamt     1298:        /* Check for ASTs on exit to user mode. */
1.62      bouyer   1299:        CLI(%eax)
1.68      ad       1300:        movl    L_MD_ASTPENDING(%edi), %eax
                   1301:        orl     CPUVAR(WANT_PMAPLOAD), %eax
1.24      yamt     1302:        jnz     9f
1.62      bouyer   1303: #ifdef XEN
                   1304:        STIC(%eax)
                   1305:        jz      14f
                   1306:        call    _C_LABEL(stipending)
                   1307:        testl   %eax,%eax
                   1308:        jz      14f
                   1309:        /* process pending interrupts */
                   1310:        CLI(%eax)
                   1311:        movl    CPUVAR(ILEVEL), %ebx
1.115     maxv     1312:        movl    $.Lsyscall_resume, %esi /* address to resume loop at */
1.62      bouyer   1313: .Lsyscall_resume:
1.115     maxv     1314:        movl    %ebx,%eax               /* get cpl */
1.62      bouyer   1315:        movl    CPUVAR(IUNMASK)(,%eax,4),%eax
1.115     maxv     1316:        andl    CPUVAR(IPENDING),%eax   /* any non-masked bits left? */
1.62      bouyer   1317:        jz      17f
                   1318:        bsrl    %eax,%eax
                   1319:        btrl    %eax,CPUVAR(IPENDING)
                   1320:        movl    CPUVAR(ISOURCES)(,%eax,4),%eax
                   1321:        jmp     *IS_RESUME(%eax)
1.115     maxv     1322: 17:    movl    %ebx, CPUVAR(ILEVEL)    /* restore cpl  */
1.62      bouyer   1323:        jmp     .Lsyscall_checkast
                   1324: 14:
                   1325: #endif /* XEN */
1.1       fvdl     1326: #ifndef DIAGNOSTIC
1.24      yamt     1327:        INTRFASTEXIT
1.1       fvdl     1328: #else /* DIAGNOSTIC */
1.24      yamt     1329:        cmpl    $IPL_NONE,CPUVAR(ILEVEL)
1.1       fvdl     1330:        jne     3f
                   1331:        INTRFASTEXIT
1.62      bouyer   1332: 3:     STI(%eax)
1.1       fvdl     1333:        pushl   $4f
1.84      ad       1334:        call    _C_LABEL(panic)
1.1       fvdl     1335:        addl    $4,%esp
1.58      ad       1336:        pushl   $IPL_NONE
                   1337:        call    _C_LABEL(spllower)
                   1338:        addl    $4,%esp
1.53      yamt     1339:        jmp     .Lsyscall_checkast
1.84      ad       1340: 4:     .asciz  "SPL NOT LOWERED ON SYSCALL EXIT\n"
                   1341: 5:     .asciz  "SPL NOT ZERO ON SYSCALL ENTRY\n"
1.1       fvdl     1342: #endif /* DIAGNOSTIC */
1.68      ad       1343: 9:
                   1344:        cmpl    $0, CPUVAR(WANT_PMAPLOAD)
                   1345:        jz      10f
                   1346:        STI(%eax)
1.24      yamt     1347:        call    _C_LABEL(pmap_load)
1.27      yamt     1348:        jmp     .Lsyscall_checkast      /* re-check ASTs */
1.68      ad       1349: 10:
                   1350:        /* Always returning to user mode here. */
                   1351:        movl    $0, L_MD_ASTPENDING(%edi)
                   1352:        STI(%eax)
                   1353:        /* Pushed T_ASTFLT into tf_trapno on entry. */
                   1354:        pushl   %esp
                   1355:        call    _C_LABEL(trap)
                   1356:        addl    $4,%esp
                   1357:        jmp     .Lsyscall_checkast      /* re-check ASTs */
1.72      yamt     1358: IDTVEC_END(syscall)
1.1       fvdl     1359:
1.81      ad       1360: IDTVEC(svr4_fasttrap)
1.115     maxv     1361:        pushl   $2              /* size of instruction for restart */
                   1362:        pushl   $T_ASTFLT       /* trap # for doing ASTs */
1.81      ad       1363:        INTRENTRY
1.85      ad       1364:        STI(%eax)
1.81      ad       1365:        pushl   $RW_READER
                   1366:        pushl   $_C_LABEL(svr4_fasttrap_lock)
                   1367:        call    _C_LABEL(rw_enter)
                   1368:        addl    $8,%esp
                   1369:        call    *_C_LABEL(svr4_fasttrap_vec)
                   1370:        pushl   $_C_LABEL(svr4_fasttrap_lock)
                   1371:        call    _C_LABEL(rw_exit)
                   1372:        addl    $4,%esp
                   1373: 2:     /* Check for ASTs on exit to user mode. */
                   1374:        cli
1.115     maxv     1375:        CHECK_ASTPENDING(%eax)
1.81      ad       1376:        je      1f
                   1377:        /* Always returning to user mode here. */
                   1378:        CLEAR_ASTPENDING(%eax)
                   1379:        sti
                   1380:        /* Pushed T_ASTFLT into tf_trapno on entry. */
                   1381:        pushl   %esp
                   1382:        call    _C_LABEL(trap)
                   1383:        addl    $4,%esp
                   1384:        jmp     2b
                   1385: 1:     CHECK_DEFERRED_SWITCH
                   1386:        jnz     9f
                   1387:        INTRFASTEXIT
                   1388: 9:     sti
                   1389:        call    _C_LABEL(pmap_load)
                   1390:        cli
                   1391:        jmp     2b
                   1392:
1.48      yamt     1393: /*
                   1394:  * int npx586bug1(int a, int b)
1.110     dsl      1395:  * Used when checking for the FDIV bug on first generations pentiums.
                   1396:  * Anything 120MHz or above is fine.
1.48      yamt     1397:  */
1.1       fvdl     1398: NENTRY(npx586bug1)
1.115     maxv     1399:        fildl   4(%esp)         /* x */
                   1400:        fildl   8(%esp)         /* y */
1.1       fvdl     1401:        fld     %st(1)
1.115     maxv     1402:        fdiv    %st(1),%st      /* x/y */
                   1403:        fmulp   %st,%st(1)      /* (x/y)*y */
                   1404:        fsubrp  %st,%st(1)      /* x-(x/y)*y */
1.1       fvdl     1405:        pushl   $0
                   1406:        fistpl  (%esp)
                   1407:        popl    %eax
                   1408:        ret
1.72      yamt     1409: END(npx586bug1)
1.50      ad       1410:
                   1411: /*
1.76      ad       1412:  * void sse2_idlezero_page(void *pg)
1.50      ad       1413:  *
1.76      ad       1414:  * Zero a page without polluting the cache.  Preemption must be
                   1415:  * disabled by the caller. Abort if a preemption is pending.
1.50      ad       1416:  */
1.76      ad       1417: ENTRY(sse2_idlezero_page)
1.50      ad       1418:        pushl   %ebp
                   1419:        movl    %esp,%ebp
                   1420:        movl    8(%esp), %edx
1.76      ad       1421:        movl    $(PAGE_SIZE/32), %ecx
1.50      ad       1422:        xorl    %eax, %eax
                   1423:        .align  16
                   1424: 1:
1.82      ad       1425:        testl   $RESCHED_KPREEMPT, CPUVAR(RESCHED)
1.76      ad       1426:        jnz     2f
1.50      ad       1427:        movnti  %eax, 0(%edx)
                   1428:        movnti  %eax, 4(%edx)
                   1429:        movnti  %eax, 8(%edx)
                   1430:        movnti  %eax, 12(%edx)
                   1431:        movnti  %eax, 16(%edx)
                   1432:        movnti  %eax, 20(%edx)
                   1433:        movnti  %eax, 24(%edx)
                   1434:        movnti  %eax, 28(%edx)
1.76      ad       1435:        addl    $32, %edx
1.75      ad       1436:        decl    %ecx
1.50      ad       1437:        jnz     1b
                   1438:        sfence
1.76      ad       1439:        incl    %eax
1.50      ad       1440:        pop     %ebp
                   1441:        ret
1.76      ad       1442: 2:
1.50      ad       1443:        sfence
                   1444:        popl    %ebp
                   1445:        ret
1.76      ad       1446: END(sse2_idlezero_page)

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