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Annotation of src/sys/arch/i386/i386/locore.S, Revision 1.117

1.117   ! maxv        1: /*     $NetBSD: locore.S,v 1.116 2016/05/12 06:45:16 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>
1.117   ! maxv      131: __KERNEL_RCSID(0, "$NetBSD: locore.S,v 1.116 2016/05/12 06:45:16 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:
1.115     maxv      171: #ifndef PAE
                    172: #define        PROC0_PDIR_OFF  0
                    173: #else
                    174: #define PROC0_L3_OFF   0
                    175: #define PROC0_PDIR_OFF 1 * PAGE_SIZE
                    176: #endif
                    177:
                    178: #define        PROC0_STK_OFF   (PROC0_PDIR_OFF + PDP_SIZE * PAGE_SIZE)
                    179: #define        PROC0_PTP1_OFF  (PROC0_STK_OFF + UPAGES * PAGE_SIZE)
                    180:
                    181: /*
                    182:  * fillkpt - Fill in a kernel page table
                    183:  *     eax = pte (page frame | control | status)
                    184:  *     ebx = page table address
                    185:  *     ecx = number of pages to map
                    186:  *
                    187:  * For PAE, each entry is 8 bytes long: we must set the 4 upper bytes to 0.
                    188:  * This is done by the first instruction of fillkpt. In the non-PAE case, this
                    189:  * instruction just clears the page table entry.
                    190:  */
                    191:
                    192: #define fillkpt        \
                    193: 1:     movl    $0,(PDE_SIZE-4)(%ebx)   ;       /* upper 32 bits: 0 */  \
                    194:        movl    %eax,(%ebx)             ;       /* store phys addr */   \
                    195:        addl    $PDE_SIZE,%ebx          ;       /* next PTE/PDE */      \
                    196:        addl    $PAGE_SIZE,%eax         ;       /* next phys page */    \
                    197:        loop    1b                      ;
                    198:
                    199:
1.62      bouyer    200: #ifdef XEN
                    201: /*
                    202:  * Xen guest identifier and loader selection
                    203:  */
                    204: .section __xen_guest
                    205:        .ascii  "GUEST_OS=netbsd,GUEST_VER=3.0,XEN_VER=xen-3.0"
1.106     uebayasi  206:        .ascii  ",VIRT_BASE=0xc0000000" /* KERNBASE */
                    207:        .ascii  ",ELF_PADDR_OFFSET=0xc0000000" /* KERNBASE */
                    208:        .ascii  ",VIRT_ENTRY=0xc0100000" /* KERNTEXTOFF */
                    209:        .ascii  ",HYPERCALL_PAGE=0x00000101"
1.62      bouyer    210:                /* (???+HYPERCALL_PAGE_OFFSET)/PAGE_SIZE) */
1.66      bouyer    211: #ifdef PAE
1.106     uebayasi  212:        .ascii  ",PAE=yes[extended-cr3]"
1.66      bouyer    213: #endif
1.62      bouyer    214:        .ascii  ",LOADER=generic"
1.114     uebayasi  215: #if (NKSYMS || defined(DDB) || defined(MODULAR)) && !defined(makeoptions_COPY_SYMTAB)
1.62      bouyer    216:        .ascii  ",BSD_SYMTAB=yes"
                    217: #endif
                    218:        .byte   0
1.106     uebayasi  219: #endif /* XEN */
1.62      bouyer    220:
1.1       fvdl      221: /*
                    222:  * Initialization
                    223:  */
                    224:        .data
                    225:
1.100     chs       226:        .globl  _C_LABEL(cputype)
1.73      ad        227:        .globl  _C_LABEL(cpuid_level)
1.38      jmmv      228:        .globl  _C_LABEL(esym)
1.71      ad        229:        .globl  _C_LABEL(eblob)
1.38      jmmv      230:        .globl  _C_LABEL(atdevbase)
1.104     uebayasi  231:        .globl  _C_LABEL(lwp0uarea)
                    232:        .globl  _C_LABEL(PDPpaddr)
1.1       fvdl      233:        .globl  _C_LABEL(gdt)
                    234:        .globl  _C_LABEL(idt)
1.30      junyoung  235:        .globl  _C_LABEL(lapic_tpr)
                    236:
1.1       fvdl      237: #if NLAPIC > 0
                    238: #ifdef __ELF__
1.7       thorpej   239:        .align  PAGE_SIZE
1.1       fvdl      240: #else
                    241:        .align  12
                    242: #endif
                    243:        .globl _C_LABEL(local_apic), _C_LABEL(lapic_id)
1.104     uebayasi  244:        .type   _C_LABEL(local_apic), @object
                    245: LABEL(local_apic)
1.1       fvdl      246:        .space  LAPIC_ID
1.104     uebayasi  247: END(local_apic)
                    248:        .type   _C_LABEL(lapic_id), @object
                    249: LABEL(lapic_id)
1.1       fvdl      250:        .long   0x00000000
1.106     uebayasi  251:        .space  LAPIC_TPRI-(LAPIC_ID+4)
1.104     uebayasi  252: END(lapic_id)
                    253:        .type   _C_LABEL(lapic_tpr), @object
                    254: LABEL(lapic_tpr)
1.106     uebayasi  255:        .space  LAPIC_PPRI-LAPIC_TPRI
1.104     uebayasi  256: END(lapic_tpr)
                    257:        .type   _C_LABEL(lapic_ppr), @object
1.30      junyoung  258: _C_LABEL(lapic_ppr):
1.1       fvdl      259:        .space  LAPIC_ISR-LAPIC_PPRI
1.104     uebayasi  260: END(lapic_ppr)
                    261:        .type   _C_LABEL(lapic_isr), @object
1.1       fvdl      262: _C_LABEL(lapic_isr):
1.7       thorpej   263:        .space  PAGE_SIZE-LAPIC_ISR
1.104     uebayasi  264: END(lapic_isr)
1.1       fvdl      265: #else
1.104     uebayasi  266:        .type   _C_LABEL(lapic_tpr), @object
                    267: LABEL(lapic_tpr)
1.1       fvdl      268:        .long 0
1.104     uebayasi  269: END(lapic_tpr)
1.1       fvdl      270: #endif
1.104     uebayasi  271:        .type   _C_LABEL(cputype), @object
1.115     maxv      272: LABEL(cputype)         .long   0       /* are we 80486, Pentium, or.. */
1.104     uebayasi  273: END(cputype)
                    274:        .type   _C_LABEL(cpuid_level), @object
                    275: LABEL(cpuid_level)     .long   0
                    276: END(cpuid_level)
                    277:        .type   _C_LABEL(atdevbase), @object
1.115     maxv      278: LABEL(atdevbase)       .long   0       /* location of start of iomem in virt */
1.104     uebayasi  279: END(atdevbase)
                    280:        .type   _C_LABEL(lwp0uarea), @object
                    281: LABEL(lwp0uarea)       .long   0
                    282: END(lwp0uarea)
                    283:        .type   _C_LABEL(PDPpaddr), @object
1.115     maxv      284: LABEL(PDPpaddr)                .long   0       /* paddr of PDP, for libkvm */
1.104     uebayasi  285: END(PDPpaddr)
                    286:        .type   _C_LABEL(tablesize), @object
1.53      yamt      287: _C_LABEL(tablesize):   .long   0
1.104     uebayasi  288: END(tablesize)
1.115     maxv      289:
                    290:        /* Space for the temporary stack */
1.104     uebayasi  291:        .size   tmpstk, tmpstk - .
1.115     maxv      292:        .space  512
1.1       fvdl      293: tmpstk:
1.96      cherry    294: #ifdef XEN
1.115     maxv      295:        .align          PAGE_SIZE, 0x0  /* Align on page boundary */
1.104     uebayasi  296: LABEL(tmpgdt)
1.115     maxv      297:        .space          PAGE_SIZE       /* Xen expects a page */
1.104     uebayasi  298: END(tmpgdt)
1.96      cherry    299: #endif /* XEN */
1.1       fvdl      300:
                    301:        .text
                    302:        .globl  _C_LABEL(kernel_text)
                    303:        .set    _C_LABEL(kernel_text),KERNTEXTOFF
                    304:
1.104     uebayasi  305: ENTRY(start)
1.62      bouyer    306: #ifndef XEN
1.115     maxv      307:
                    308:        /* Warm boot */
                    309:        movw    $0x1234,0x472
                    310:
1.37      jmmv      311: #if defined(MULTIBOOT)
                    312:        jmp     1f
                    313:
                    314:        .align  4
                    315:        .globl  Multiboot_Header
                    316: _C_LABEL(Multiboot_Header):
1.44      jmmv      317: #define MULTIBOOT_HEADER_FLAGS (MULTIBOOT_HEADER_WANT_MEMORY)
1.37      jmmv      318:        .long   MULTIBOOT_HEADER_MAGIC
                    319:        .long   MULTIBOOT_HEADER_FLAGS
                    320:        .long   -(MULTIBOOT_HEADER_MAGIC + MULTIBOOT_HEADER_FLAGS)
                    321:
                    322: 1:
                    323:        /* Check if we are being executed by a Multiboot-compliant boot
                    324:         * loader. */
                    325:        cmpl    $MULTIBOOT_INFO_MAGIC,%eax
                    326:        jne     1f
                    327:
1.43      mrg       328:        /*
                    329:         * Indeed, a multiboot-compliant boot loader executed us.  We copy
1.37      jmmv      330:         * the received Multiboot information structure into kernel's data
                    331:         * space to process it later -- after we are relocated.  It will
1.43      mrg       332:         * be safer to run complex C code than doing it at this point.
                    333:         */
1.115     maxv      334:        pushl   %ebx            /* Address of Multiboot information */
1.37      jmmv      335:        call    _C_LABEL(multiboot_pre_reloc)
                    336:        addl    $4,%esp
1.38      jmmv      337:        jmp     2f
1.37      jmmv      338: #endif
                    339:
                    340: 1:
1.1       fvdl      341:        /*
1.38      jmmv      342:         * At this point, we know that a NetBSD-specific boot loader
1.117   ! maxv      343:         * booted this kernel.
        !           344:         *
        !           345:         * Load parameters from the stack (32 bits):
        !           346:         *     boothowto, [bootdev], bootinfo, esym, biosextmem, biosbasemem
        !           347:         * We are not interested in 'bootdev'.
1.1       fvdl      348:         */
1.117   ! maxv      349:
1.115     maxv      350:        addl    $4,%esp         /* Discard return address to boot loader */
1.38      jmmv      351:        call    _C_LABEL(native_loader)
                    352:        addl    $24,%esp
1.1       fvdl      353:
                    354: 2:
                    355:        /* First, reset the PSL. */
                    356:        pushl   $PSL_MBO
                    357:        popfl
                    358:
                    359:        /* Clear segment registers; always null in proc0. */
                    360:        xorl    %eax,%eax
                    361:        movw    %ax,%fs
                    362:        movw    %ax,%gs
                    363:        decl    %eax
1.73      ad        364:        movl    %eax,RELOC(cpuid_level)
1.1       fvdl      365:
                    366:        /* Find out our CPU type. */
                    367:
                    368: try386:        /* Try to toggle alignment check flag; does not exist on 386. */
                    369:        pushfl
                    370:        popl    %eax
                    371:        movl    %eax,%ecx
                    372:        orl     $PSL_AC,%eax
                    373:        pushl   %eax
                    374:        popfl
                    375:        pushfl
                    376:        popl    %eax
                    377:        xorl    %ecx,%eax
                    378:        andl    $PSL_AC,%eax
                    379:        pushl   %ecx
                    380:        popfl
                    381:
                    382:        testl   %eax,%eax
                    383:        jnz     try486
                    384:
                    385:        /*
                    386:         * Try the test of a NexGen CPU -- ZF will not change on a DIV
                    387:         * instruction on a NexGen, it will on an i386.  Documented in
                    388:         * Nx586 Processor Recognition Application Note, NexGen, Inc.
                    389:         */
                    390:        movl    $0x5555,%eax
                    391:        xorl    %edx,%edx
                    392:        movl    $2,%ecx
                    393:        divl    %ecx
                    394:        jnz     is386
                    395:
                    396: isnx586:
                    397:        /*
                    398:         * Don't try cpuid, as Nx586s reportedly don't support the
                    399:         * PSL_ID bit.
                    400:         */
1.100     chs       401:        movl    $CPU_NX586,RELOC(cputype)
1.1       fvdl      402:        jmp     2f
                    403:
                    404: is386:
1.100     chs       405:        movl    $CPU_386,RELOC(cputype)
1.1       fvdl      406:        jmp     2f
                    407:
                    408: try486:        /* Try to toggle identification flag; does not exist on early 486s. */
                    409:        pushfl
                    410:        popl    %eax
                    411:        movl    %eax,%ecx
                    412:        xorl    $PSL_ID,%eax
                    413:        pushl   %eax
                    414:        popfl
                    415:        pushfl
                    416:        popl    %eax
                    417:        xorl    %ecx,%eax
                    418:        andl    $PSL_ID,%eax
                    419:        pushl   %ecx
                    420:        popfl
                    421:
                    422:        testl   %eax,%eax
                    423:        jnz     try586
1.100     chs       424: is486: movl    $CPU_486,RELOC(cputype)
1.1       fvdl      425:        /*
                    426:         * Check Cyrix CPU
                    427:         * Cyrix CPUs do not change the undefined flags following
                    428:         * execution of the divide instruction which divides 5 by 2.
                    429:         *
                    430:         * Note: CPUID is enabled on M2, so it passes another way.
                    431:         */
                    432:        pushfl
                    433:        movl    $0x5555, %eax
                    434:        xorl    %edx, %edx
                    435:        movl    $2, %ecx
                    436:        clc
                    437:        divl    %ecx
                    438:        jnc     trycyrix486
                    439:        popfl
                    440:        jmp 2f
                    441: trycyrix486:
1.115     maxv      442:        movl    $CPU_6x86,RELOC(cputype)        /* set CPU type */
1.1       fvdl      443:        /*
                    444:         * Check for Cyrix 486 CPU by seeing if the flags change during a
                    445:         * divide. This is documented in the Cx486SLC/e SMM Programmer's
                    446:         * Guide.
                    447:         */
                    448:        xorl    %edx,%edx
1.115     maxv      449:        cmpl    %edx,%edx               /* set flags to known state */
1.1       fvdl      450:        pushfl
1.115     maxv      451:        popl    %ecx                    /* store flags in ecx */
1.1       fvdl      452:        movl    $-1,%eax
                    453:        movl    $4,%ebx
1.115     maxv      454:        divl    %ebx                    /* do a long division */
1.1       fvdl      455:        pushfl
                    456:        popl    %eax
1.115     maxv      457:        xorl    %ecx,%eax               /* are the flags different? */
                    458:        testl   $0x8d5,%eax             /* only check C|PF|AF|Z|N|V */
                    459:        jne     2f                      /* yes; must be Cyrix 6x86 CPU */
                    460:        movl    $CPU_486DLC,RELOC(cputype)      /* set CPU type */
1.1       fvdl      461:
                    462: #ifndef CYRIX_CACHE_WORKS
                    463:        /* Disable caching of the ISA hole only. */
                    464:        invd
1.115     maxv      465:        movb    $CCR0,%al       /* Configuration Register index (CCR0) */
1.1       fvdl      466:        outb    %al,$0x22
                    467:        inb     $0x23,%al
                    468:        orb     $(CCR0_NC1|CCR0_BARB),%al
                    469:        movb    %al,%ah
                    470:        movb    $CCR0,%al
                    471:        outb    %al,$0x22
                    472:        movb    %ah,%al
                    473:        outb    %al,$0x23
                    474:        invd
                    475: #else /* CYRIX_CACHE_WORKS */
                    476:        /* Set cache parameters */
1.115     maxv      477:        invd                    /* Start with guaranteed clean cache */
                    478:        movb    $CCR0,%al       /* Configuration Register index (CCR0) */
1.1       fvdl      479:        outb    %al,$0x22
                    480:        inb     $0x23,%al
                    481:        andb    $~CCR0_NC0,%al
                    482: #ifndef CYRIX_CACHE_REALLY_WORKS
                    483:        orb     $(CCR0_NC1|CCR0_BARB),%al
                    484: #else
                    485:        orb     $CCR0_NC1,%al
                    486: #endif
                    487:        movb    %al,%ah
                    488:        movb    $CCR0,%al
                    489:        outb    %al,$0x22
                    490:        movb    %ah,%al
                    491:        outb    %al,$0x23
                    492:        /* clear non-cacheable region 1 */
                    493:        movb    $(NCR1+2),%al
                    494:        outb    %al,$0x22
                    495:        movb    $NCR_SIZE_0K,%al
                    496:        outb    %al,$0x23
                    497:        /* clear non-cacheable region 2 */
                    498:        movb    $(NCR2+2),%al
                    499:        outb    %al,$0x22
                    500:        movb    $NCR_SIZE_0K,%al
                    501:        outb    %al,$0x23
                    502:        /* clear non-cacheable region 3 */
                    503:        movb    $(NCR3+2),%al
                    504:        outb    %al,$0x22
                    505:        movb    $NCR_SIZE_0K,%al
                    506:        outb    %al,$0x23
                    507:        /* clear non-cacheable region 4 */
                    508:        movb    $(NCR4+2),%al
                    509:        outb    %al,$0x22
                    510:        movb    $NCR_SIZE_0K,%al
                    511:        outb    %al,$0x23
                    512:        /* enable caching in CR0 */
                    513:        movl    %cr0,%eax
                    514:        andl    $~(CR0_CD|CR0_NW),%eax
                    515:        movl    %eax,%cr0
                    516:        invd
                    517: #endif /* CYRIX_CACHE_WORKS */
                    518:
                    519:        jmp     2f
                    520:
                    521: try586:        /* Use the `cpuid' instruction. */
                    522:        xorl    %eax,%eax
                    523:        cpuid
1.73      ad        524:        movl    %eax,RELOC(cpuid_level)
1.1       fvdl      525:
                    526: 2:
                    527:        /*
                    528:         * Finished with old stack; load new %esp now instead of later so we
                    529:         * can trace this code without having to worry about the trace trap
                    530:         * clobbering the memory test or the zeroing of the bss+bootstrap page
                    531:         * tables.
                    532:         *
                    533:         * The boot program should check:
                    534:         *      text+data <= &stack_variable - more_space_for_stack
                    535:         *      text+data+bss+pad+space_for_page_tables <= end_of_memory
1.115     maxv      536:         *
                    537:         * XXX: the gdt is in the carcass of the boot program so clearing
1.1       fvdl      538:         * the rest of memory is still not possible.
                    539:         */
1.115     maxv      540:        movl    $_RELOC(tmpstk),%esp
1.1       fvdl      541:
                    542: /*
1.117   ! maxv      543:  * There are two different layouts possible, depending on whether PAE is
        !           544:  * enabled or not.
1.1       fvdl      545:  *
1.117   ! maxv      546:  * If PAE is not enabled, there are two levels of pages: PD -> PT. They will
        !           547:  * be referred to as: L2 -> L1. L2 is 1 page long. The BOOTSTRAP TABLES have
        !           548:  * the following layout:
        !           549:  *     +-----+------------+----+
        !           550:  *     | L2 -> PROC0 STK -> L1 |
        !           551:  *     +-----+------------+----+
        !           552:  *
        !           553:  * If PAE is enabled, there are three levels of pages: PDP -> PD -> PT. They
        !           554:  * will be referred to as: L3 -> L2 -> L1. L3 is 1 page long, L2 is 4 page
        !           555:  * long. The BOOTSTRAP TABLES have the following layout:
        !           556:  *     +-----+-----+------------+----+
        !           557:  *     | L3 -> L2 -> PROC0 STK -> L1 |
        !           558:  *     +-----+-----+------------+----+
        !           559:  *
        !           560:  * Virtual address space of the kernel in both cases:
        !           561:  * +------+--------+------+-----+--------+---------------------+-----------
        !           562:  * | TEXT | RODATA | DATA | BSS | [SYMS] | [PRELOADED MODULES] | BOOTSTRAP
        !           563:  * +------+--------+------+-----+--------+---------------------+-----------
        !           564:  *                             (1)      (2)                   (3)
        !           565:  *
        !           566:  * -------+------------+
        !           567:  * TABLES | ISA IO MEM |
        !           568:  * -------+------------+
        !           569:  *       (4)
1.93      jym       570:  *
1.117   ! maxv      571:  * PROC0 STK is obviously not linked as a page level. It just happens to be
        !           572:  * caught between L2 and L1.
1.1       fvdl      573:  */
                    574:
1.117   ! maxv      575:        /* Find end of kernel image; brings us on (1). */
1.1       fvdl      576:        movl    $RELOC(end),%edi
1.71      ad        577:
1.114     uebayasi  578: #if (NKSYMS || defined(DDB) || defined(MODULAR)) && !defined(makeoptions_COPY_SYMTAB)
1.117   ! maxv      579:        /* Save the symbols (if loaded); brinds us on (2). */
1.1       fvdl      580:        movl    RELOC(esym),%eax
                    581:        testl   %eax,%eax
                    582:        jz      1f
1.35      yamt      583:        subl    $KERNBASE,%eax
1.1       fvdl      584:        movl    %eax,%edi
                    585: 1:
                    586: #endif
                    587:
1.117   ! maxv      588:        /* Skip over any modules/blobs; brings us on (3). */
1.71      ad        589:        movl    RELOC(eblob),%eax
                    590:        testl   %eax,%eax
                    591:        jz      1f
                    592:        subl    $KERNBASE,%eax
                    593:        movl    %eax,%edi
                    594: 1:
1.117   ! maxv      595:
        !           596:        /* We are on (3). Align up for BOOTSTRAP TABLES. */
1.71      ad        597:        movl    %edi,%esi
1.115     maxv      598:        addl    $PGOFSET,%esi
1.1       fvdl      599:        andl    $~PGOFSET,%esi
                    600:
1.53      yamt      601:        /* nkptp[1] = (esi + ~L2_FRAME) >> L2_SHIFT + 1; */
                    602:        movl    %esi,%eax
                    603:        addl    $~L2_FRAME,%eax
                    604:        shrl    $L2_SHIFT,%eax
1.117   ! maxv      605:        incl    %eax            /* one more PTP for VAs stolen by bootstrap */
1.53      yamt      606: 1:     movl    %eax,RELOC(nkptp)+1*4
                    607:
1.93      jym       608:        /* tablesize = (PDP_SIZE + UPAGES + nkptp) << PGSHIFT; */
                    609:        addl    $(PDP_SIZE+UPAGES),%eax
                    610: #ifdef PAE
1.117   ! maxv      611:        incl    %eax            /* one more page for L3 */
1.93      jym       612:        shll    $PGSHIFT+1,%eax /* PTP tables are twice larger with PAE */
                    613: #else
1.53      yamt      614:        shll    $PGSHIFT,%eax
1.93      jym       615: #endif
1.53      yamt      616:        movl    %eax,RELOC(tablesize)
                    617:
1.117   ! maxv      618:        /* Ensure that nkptp covers BOOTSTRAP TABLES. */
1.53      yamt      619:        addl    %esi,%eax
                    620:        addl    $~L2_FRAME,%eax
                    621:        shrl    $L2_SHIFT,%eax
                    622:        incl    %eax
                    623:        cmpl    %eax,RELOC(nkptp)+1*4
                    624:        jnz     1b
                    625:
1.117   ! maxv      626:        /* Now, zero out the BOOTSTRAP TABLES (before filling them in). */
1.105     uebayasi  627:        movl    %esi,%edi
1.1       fvdl      628:        xorl    %eax,%eax
                    629:        cld
1.105     uebayasi  630:        movl    RELOC(tablesize),%ecx
                    631:        shrl    $2,%ecx
1.1       fvdl      632:        rep
1.117   ! maxv      633:        stosl                           /* copy eax -> edi */
1.1       fvdl      634:
                    635: /*
1.117   ! maxv      636:  * Build the page tables and levels. We go from L1 to L2/L3, and link the levels
        !           637:  * together. Note: RELOC computes &addr - KERNBASE in 32 bits; the value can't
        !           638:  * be > 4G, or we can't deal with it anyway, since we are in 32bit mode.
1.1       fvdl      639:  */
1.105     uebayasi  640:        /*
1.117   ! maxv      641:         * Build L1.
1.105     uebayasi  642:         */
1.117   ! maxv      643:        leal    (PROC0_PTP1_OFF)(%esi),%ebx
        !           644:
        !           645:        /* Compute &__rodata_start - KERNBASE. */
1.116     maxv      646:        movl    $RELOC(__rodata_start),%edx
1.1       fvdl      647:        andl    $~PGOFSET,%edx
1.30      junyoung  648:
1.117   ! maxv      649:        /* Skip the first MB. */
1.1       fvdl      650:        movl    $_RELOC(KERNTEXTOFF),%eax
                    651:        movl    %eax,%ecx
1.117   ! maxv      652:        shrl    $(PGSHIFT-2),%ecx       /* ((n >> PGSHIFT) << 2) for # PDEs */
1.93      jym       653: #ifdef PAE
1.117   ! maxv      654:        shll    $1,%ecx                 /* PDEs are twice larger with PAE */
1.93      jym       655: #endif
1.105     uebayasi  656:        addl    %ecx,%ebx
1.1       fvdl      657:
                    658:        /* Map the kernel text read-only. */
                    659:        movl    %edx,%ecx
                    660:        subl    %eax,%ecx
                    661:        shrl    $PGSHIFT,%ecx
                    662:        orl     $(PG_V|PG_KR),%eax
                    663:        fillkpt
                    664:
                    665:        /* Map the data, BSS, and bootstrap tables read-write. */
                    666:        leal    (PG_V|PG_KW)(%edx),%eax
1.53      yamt      667:        movl    RELOC(tablesize),%ecx
1.115     maxv      668:        addl    %esi,%ecx                       /* end of tables */
                    669:        subl    %edx,%ecx                       /* subtract end of text */
1.1       fvdl      670:        shrl    $PGSHIFT,%ecx
                    671:        fillkpt
                    672:
1.53      yamt      673:        /* Map ISA I/O mem (later atdevbase) */
1.115     maxv      674:        movl    $(IOM_BEGIN|PG_V|PG_KW/*|PG_N*/),%eax
                    675:        movl    $(IOM_SIZE>>PGSHIFT),%ecx
1.1       fvdl      676:        fillkpt
                    677:
1.117   ! maxv      678:        /*
        !           679:         * Build L2 for identity mapping. Linked to L1.
        !           680:         */
1.105     uebayasi  681:        leal    (PROC0_PDIR_OFF)(%esi),%ebx
                    682:        leal    (PROC0_PTP1_OFF)(%esi),%eax
1.117   ! maxv      683:        orl     $(PG_V|PG_KW),%eax
1.105     uebayasi  684:        movl    RELOC(nkptp)+1*4,%ecx
1.1       fvdl      685:        fillkpt
                    686:
1.117   ! maxv      687:        /* Set up L2 entries for actual kernel mapping */
        !           688:        leal    (PROC0_PDIR_OFF + L2_SLOT_KERNBASE * PDE_SIZE)(%esi),%ebx
1.105     uebayasi  689:        leal    (PROC0_PTP1_OFF)(%esi),%eax
1.117   ! maxv      690:        orl     $(PG_V|PG_KW),%eax
1.105     uebayasi  691:        movl    RELOC(nkptp)+1*4,%ecx
1.1       fvdl      692:        fillkpt
                    693:
                    694:        /* Install a PDE recursively mapping page directory as a page table! */
1.117   ! maxv      695:        leal    (PROC0_PDIR_OFF + PDIR_SLOT_PTE * PDE_SIZE)(%esi),%ebx
1.105     uebayasi  696:        leal    (PROC0_PDIR_OFF)(%esi),%eax
                    697:        orl     $(PG_V|PG_KW),%eax
1.93      jym       698:        movl    $PDP_SIZE,%ecx
                    699:        fillkpt
                    700:
                    701: #ifdef PAE
1.117   ! maxv      702:        /*
        !           703:         * Build L3. Linked to L2.
        !           704:         */
1.93      jym       705:        leal    (PROC0_L3_OFF)(%esi),%ebx
                    706:        leal    (PROC0_PDIR_OFF)(%esi),%eax
                    707:        orl     $(PG_V),%eax
                    708:        movl    $PDP_SIZE,%ecx
                    709:        fillkpt
                    710:
                    711:        /* Enable PAE mode */
                    712:        movl    %cr4,%eax
                    713:        orl     $CR4_PAE,%eax
                    714:        movl    %eax,%cr4
                    715: #endif
1.1       fvdl      716:
1.117   ! maxv      717:        /* Save physical address of L2. */
1.93      jym       718:        leal    (PROC0_PDIR_OFF)(%esi),%eax
                    719:        movl    %eax,RELOC(PDPpaddr)
1.1       fvdl      720:
1.93      jym       721:        /*
                    722:         * Startup checklist:
1.117   ! maxv      723:         * 1. Load %cr3 with pointer to L2 (or L3 for PAE).
1.93      jym       724:         */
1.117   ! maxv      725:        movl    %esi,%eax
        !           726:        movl    %eax,%cr3
1.93      jym       727:
1.105     uebayasi  728:        /*
                    729:         * 2. Enable paging and the rest of it.
                    730:         */
1.115     maxv      731:        movl    %cr0,%eax
1.111     dsl       732:        orl     $(CR0_PE|CR0_PG|CR0_NE|CR0_TS|CR0_MP|CR0_WP|CR0_AM),%eax
1.115     maxv      733:        movl    %eax,%cr0
1.1       fvdl      734:
1.115     maxv      735:        pushl   $begin                  /* jump to high mem */
1.1       fvdl      736:        ret
                    737:
                    738: begin:
1.105     uebayasi  739:        /*
1.117   ! maxv      740:         * We have arrived. There's no need anymore for the identity mapping in
        !           741:         * low memory, remove it.
1.105     uebayasi  742:         */
                    743:        movl    _C_LABEL(nkptp)+1*4,%ecx
1.115     maxv      744:        leal    (PROC0_PDIR_OFF)(%esi),%ebx     /* old, phys address of PDIR */
                    745:        addl    $(KERNBASE), %ebx               /* new, virt address of PDIR */
                    746: 1:     movl    $0,(PDE_SIZE-4)(%ebx)           /* upper bits (for PAE) */
1.93      jym       747:        movl    $0,(%ebx)
1.105     uebayasi  748:        addl    $PDE_SIZE,%ebx
1.1       fvdl      749:        loop    1b
                    750:
                    751:        /* Relocate atdevbase. */
1.53      yamt      752:        movl    $KERNBASE,%edx
                    753:        addl    _C_LABEL(tablesize),%edx
1.1       fvdl      754:        addl    %esi,%edx
                    755:        movl    %edx,_C_LABEL(atdevbase)
                    756:
                    757:        /* Set up bootstrap stack. */
1.105     uebayasi  758:        leal    (PROC0_STK_OFF+KERNBASE)(%esi),%eax
1.91      rmind     759:        movl    %eax,_C_LABEL(lwp0uarea)
1.112     dsl       760:        leal    (USPACE-FRAMESIZE)(%eax),%esp
1.115     maxv      761:        movl    %esi,PCB_CR3(%eax)      /* pcb->pcb_cr3 */
                    762:        xorl    %ebp,%ebp               /* mark end of frames */
1.1       fvdl      763:
1.37      jmmv      764: #if defined(MULTIBOOT)
                    765:        /* It is now safe to parse the Multiboot information structure
                    766:         * we saved before from C code.  Note that we cannot delay its
                    767:         * parsing any more because initgdt (called below) needs to make
                    768:         * use of this information. */
                    769:        call    _C_LABEL(multiboot_post_reloc)
                    770: #endif
                    771:
1.115     maxv      772:        subl    $NGDT*8, %esp           /* space for temporary gdt */
1.1       fvdl      773:        pushl   %esp
                    774:        call    _C_LABEL(initgdt)
                    775:        addl    $4,%esp
1.30      junyoung  776:
1.105     uebayasi  777:        movl    _C_LABEL(tablesize),%eax
1.115     maxv      778:        addl    %esi,%eax               /* skip past stack and page tables */
1.1       fvdl      779:
1.93      jym       780: #ifdef PAE
1.115     maxv      781:        pushl   $0      /* init386() expects a 64 bits paddr_t with PAE */
1.93      jym       782: #endif
1.1       fvdl      783:        pushl   %eax
1.115     maxv      784:        call    _C_LABEL(init386)       /* wire 386 chip for unix operation */
                    785:        addl    $PDE_SIZE,%esp          /* pop paddr_t */
                    786:        addl    $NGDT*8,%esp            /* pop temporary gdt */
1.1       fvdl      787:
                    788: #ifdef SAFARI_FIFO_HACK
                    789:        movb    $5,%al
                    790:        movw    $0x37b,%dx
                    791:        outb    %al,%dx
                    792:        movw    $0x37f,%dx
                    793:        inb     %dx,%al
                    794:        movb    %al,%cl
                    795:
                    796:        orb     $1,%cl
                    797:
                    798:        movb    $5,%al
                    799:        movw    $0x37b,%dx
                    800:        outb    %al,%dx
                    801:        movw    $0x37f,%dx
                    802:        movb    %cl,%al
                    803:        outb    %al,%dx
                    804: #endif /* SAFARI_FIFO_HACK */
                    805:
                    806:        call    _C_LABEL(main)
1.62      bouyer    807: #else /* XEN */
                    808:        /* First, reset the PSL. */
                    809:        pushl   $PSL_MBO
                    810:        popfl
                    811:
                    812:        cld
1.115     maxv      813:        movl    %esp, %ebx              /* save start of available space */
                    814:        movl    $_RELOC(tmpstk),%esp    /* bootstrap stack end location */
1.62      bouyer    815:
1.106     uebayasi  816:        /* Clear BSS. */
1.62      bouyer    817:        xorl    %eax,%eax
                    818:        movl    $RELOC(__bss_start),%edi
                    819:        movl    $RELOC(_end),%ecx
                    820:        subl    %edi,%ecx
                    821:        rep stosb
                    822:
                    823:        /* Copy the necessary stuff from start_info structure. */
1.105     uebayasi  824:        /* We need to copy shared_info early, so that sti/cli work */
1.62      bouyer    825:        movl    $RELOC(start_info_union),%edi
                    826:        movl    $128,%ecx
                    827:        rep movsl
                    828:
                    829:        /* Clear segment registers; always null in proc0. */
                    830:        xorl    %eax,%eax
                    831:        movw    %ax,%fs
                    832:        movw    %ax,%gs
                    833:        decl    %eax
1.73      ad        834:        movl    %eax,RELOC(cpuid_level)
1.62      bouyer    835:
                    836:        xorl    %eax,%eax
                    837:        cpuid
1.73      ad        838:        movl    %eax,RELOC(cpuid_level)
1.62      bouyer    839:
1.96      cherry    840:        /*
                    841:         * Use a temp page. We'll re- add it to uvm(9) once we're
                    842:         * done using it.
                    843:         */
                    844:        movl    $RELOC(tmpgdt), %eax
1.115     maxv      845:        pushl   %eax            /* start of temporary gdt */
1.96      cherry    846:        call    _C_LABEL(initgdt)
                    847:        addl    $4,%esp
                    848:
1.62      bouyer    849:        call    xen_pmap_bootstrap
1.92      jym       850:
1.62      bouyer    851:        /*
                    852:         * First avail returned by xen_pmap_bootstrap in %eax
                    853:         */
                    854:        movl    %eax, %esi;
1.91      rmind     855:        movl    %esi, _C_LABEL(lwp0uarea)
1.62      bouyer    856:
                    857:        /* Set up bootstrap stack. */
1.112     dsl       858:        leal    (USPACE-FRAMESIZE)(%eax),%esp
1.115     maxv      859:        xorl    %ebp,%ebp               /* mark end of frames */
1.62      bouyer    860:
                    861:        addl    $USPACE, %esi
1.115     maxv      862:        subl    $KERNBASE, %esi         /* init386 wants a physical address */
1.92      jym       863:
                    864: #ifdef PAE
1.115     maxv      865:        pushl   $0      /* init386() expects a 64 bits paddr_t with PAE */
1.92      jym       866: #endif
1.62      bouyer    867:        pushl   %esi
1.115     maxv      868:        call    _C_LABEL(init386)       /* wire 386 chip for unix operation */
                    869:        addl    $PDE_SIZE,%esp          /* pop paddr_t */
1.62      bouyer    870:        call    _C_LABEL(main)
1.106     uebayasi  871: #endif /* XEN */
1.104     uebayasi  872: END(start)
1.62      bouyer    873:
1.101     jym       874: #if defined(XEN)
1.62      bouyer    875: /* space for the hypercall call page */
                    876: #define HYPERCALL_PAGE_OFFSET 0x1000
                    877: .org HYPERCALL_PAGE_OFFSET
                    878: ENTRY(hypercall_page)
                    879: .skip 0x1000
1.104     uebayasi  880: END(hypercall_page)
1.62      bouyer    881:
                    882: /*
                    883:  * void lgdt_finish(void);
                    884:  * Finish load a new GDT pointer (do any necessary cleanup).
                    885:  * XXX It's somewhat questionable whether reloading all the segment registers
                    886:  * is necessary, since the actual descriptor data is not changed except by
                    887:  * process creation and exit, both of which clean up via task switches.  OTOH,
                    888:  * this only happens at run time when the GDT is resized.
                    889:  */
                    890: /* LINTSTUB: Func: void lgdt_finish(void) */
                    891: NENTRY(lgdt_finish)
                    892:        movl    $GSEL(GDATA_SEL, SEL_KPL),%eax
                    893:        movw    %ax,%ds
                    894:        movw    %ax,%es
                    895:        movw    %ax,%gs
                    896:        movw    %ax,%ss
                    897:        movl    $GSEL(GCPU_SEL, SEL_KPL),%eax
                    898:        movw    %ax,%fs
                    899:        /* Reload code selector by doing intersegment return. */
                    900:        popl    %eax
                    901:        pushl   $GSEL(GCODE_SEL, SEL_KPL)
                    902:        pushl   %eax
                    903:        lret
1.72      yamt      904: END(lgdt_finish)
1.62      bouyer    905:
                    906: #endif /* XEN */
1.1       fvdl      907:
                    908: /*
1.48      yamt      909:  * void lwp_trampoline(void);
                    910:  *
1.1       fvdl      911:  * This is a trampoline function pushed onto the stack of a newly created
                    912:  * process in order to do some additional setup.  The trampoline is entered by
1.109     christos  913:  * cpu_switchto()ing to the process, so we abuse the callee-saved
                    914:  * registers used by cpu_switchto() to store the information about the
                    915:  * stub to call.
1.1       fvdl      916:  * NOTE: This function does not have a normal calling sequence!
                    917:  */
1.48      yamt      918: NENTRY(lwp_trampoline)
1.68      ad        919:        movl    %ebp,%edi       /* for .Lsyscall_checkast */
1.48      yamt      920:        xorl    %ebp,%ebp
1.68      ad        921:        pushl   %edi
1.48      yamt      922:        pushl   %eax
                    923:        call    _C_LABEL(lwp_startup)
                    924:        addl    $8,%esp
1.1       fvdl      925:        pushl   %ebx
                    926:        call    *%esi
                    927:        addl    $4,%esp
1.68      ad        928:        jmp     .Lsyscall_checkast
1.1       fvdl      929:        /* NOTREACHED */
1.72      yamt      930: END(lwp_trampoline)
1.1       fvdl      931:
                    932: /*
1.48      yamt      933:  * sigcode()
                    934:  *
                    935:  * Signal trampoline; copied to top of user stack.  Used only for
                    936:  * compatibility with old releases of NetBSD.
1.1       fvdl      937:  */
                    938: NENTRY(sigcode)
                    939:        /*
                    940:         * Handler has returned here as if we called it.  The sigcontext
                    941:         * is on the stack after the 3 args "we" pushed.
                    942:         */
1.115     maxv      943:        leal    12(%esp),%eax           /* get pointer to sigcontext */
                    944:        movl    %eax,4(%esp)            /* put it in the argument slot */
                    945:                                        /* fake return address already there */
1.17      christos  946:        movl    $SYS_compat_16___sigreturn14,%eax
1.115     maxv      947:        int     $0x80                   /* enter kernel with args on stack */
1.1       fvdl      948:        movl    $SYS_exit,%eax
1.115     maxv      949:        int     $0x80                   /* exit if sigreturn fails */
1.1       fvdl      950:        .globl  _C_LABEL(esigcode)
                    951: _C_LABEL(esigcode):
1.72      yamt      952: END(sigcode)
1.1       fvdl      953:
                    954: /*
1.48      yamt      955:  * int setjmp(label_t *)
                    956:  *
                    957:  * Used primarily by DDB.
1.1       fvdl      958:  */
                    959: ENTRY(setjmp)
                    960:        movl    4(%esp),%eax
1.115     maxv      961:        movl    %ebx,(%eax)             /* save ebx */
                    962:        movl    %esp,4(%eax)            /* save esp */
                    963:        movl    %ebp,8(%eax)            /* save ebp */
                    964:        movl    %esi,12(%eax)           /* save esi */
                    965:        movl    %edi,16(%eax)           /* save edi */
                    966:        movl    (%esp),%edx             /* get rta */
                    967:        movl    %edx,20(%eax)           /* save eip */
                    968:        xorl    %eax,%eax               /* return 0 */
1.1       fvdl      969:        ret
1.72      yamt      970: END(setjmp)
1.1       fvdl      971:
1.48      yamt      972: /*
                    973:  * int longjmp(label_t *)
                    974:  *
                    975:  * Used primarily by DDB.
                    976:  */
1.1       fvdl      977: ENTRY(longjmp)
                    978:        movl    4(%esp),%eax
1.115     maxv      979:        movl    (%eax),%ebx             /* restore ebx */
                    980:        movl    4(%eax),%esp            /* restore esp */
                    981:        movl    8(%eax),%ebp            /* restore ebp */
                    982:        movl    12(%eax),%esi           /* restore esi */
                    983:        movl    16(%eax),%edi           /* restore edi */
                    984:        movl    20(%eax),%edx           /* get rta */
                    985:        movl    %edx,(%esp)             /* put in return frame */
                    986:        movl    $1,%eax                 /* return 1 */
1.1       fvdl      987:        ret
1.72      yamt      988: END(longjmp)
1.1       fvdl      989:
1.65      skrll     990: /*
                    991:  * void dumpsys(void)
                    992:  *
                    993:  * Mimic cpu_switchto() for postmortem debugging.
                    994:  */
1.64      skrll     995: ENTRY(dumpsys)
1.115     maxv      996:        pushl   %ebx                    /* set up fake switchframe */
                    997:        pushl   %esi                    /* and save context */
                    998:        pushl   %edi
1.65      skrll     999:        movl    %esp,_C_LABEL(dumppcb)+PCB_ESP
                   1000:        movl    %ebp,_C_LABEL(dumppcb)+PCB_EBP
1.115     maxv     1001:        call    _C_LABEL(dodumpsys)     /* dump! */
                   1002:        addl    $(3*4), %esp            /* unwind switchframe */
1.64      skrll    1003:        ret
1.72      yamt     1004: END(dumpsys)
1.64      skrll    1005:
1.1       fvdl     1006: /*
1.106     uebayasi 1007:  * struct lwp *cpu_switchto(struct lwp *oldlwp, struct lwp *newlwp,
1.58      ad       1008:  *                         bool returning)
1.30      junyoung 1009:  *
1.48      yamt     1010:  *     1. if (oldlwp != NULL), save its context.
                   1011:  *     2. then, restore context of newlwp.
                   1012:  *
                   1013:  * Note that the stack frame layout is known to "struct switchframe" in
                   1014:  * <machine/frame.h> and to the code in cpu_lwp_fork() which initializes
1.5       thorpej  1015:  * it for a new lwp.
1.1       fvdl     1016:  */
1.48      yamt     1017: ENTRY(cpu_switchto)
1.1       fvdl     1018:        pushl   %ebx
                   1019:        pushl   %esi
                   1020:        pushl   %edi
                   1021:
1.70      ad       1022: #if defined(DIAGNOSTIC) && !defined(XEN)
                   1023:        cmpl    $IPL_SCHED,CPUVAR(ILEVEL)
                   1024:        jbe     0f
1.74      christos 1025:        pushl   CPUVAR(ILEVEL)
1.70      ad       1026:        pushl   $.Lstr
                   1027:        call    _C_LABEL(panic)
1.74      christos 1028:        addl    $8,%esp
                   1029: .Lstr: .string "cpu_switchto: switching above IPL_SCHED (%d)\0"
1.70      ad       1030: 0:
                   1031: #endif
                   1032:
1.115     maxv     1033:        movl    16(%esp),%esi           /* oldlwp */
                   1034:        movl    20(%esp),%edi           /* newlwp */
                   1035:        movl    24(%esp),%edx           /* returning */
1.48      yamt     1036:        testl   %esi,%esi
                   1037:        jz      1f
1.1       fvdl     1038:
1.48      yamt     1039:        /* Save old context. */
1.91      rmind    1040:        movl    L_PCB(%esi),%eax
1.48      yamt     1041:        movl    %esp,PCB_ESP(%eax)
                   1042:        movl    %ebp,PCB_EBP(%eax)
                   1043:
                   1044:        /* Switch to newlwp's stack. */
1.91      rmind    1045: 1:     movl    L_PCB(%edi),%ebx
1.48      yamt     1046:        movl    PCB_EBP(%ebx),%ebp
                   1047:        movl    PCB_ESP(%ebx),%esp
1.1       fvdl     1048:
1.61      ad       1049:        /*
                   1050:         * Set curlwp.  This must be globally visible in order to permit
                   1051:         * non-interlocked mutex release.
                   1052:         */
                   1053:        movl    %edi,%ecx
                   1054:        xchgl   %ecx,CPUVAR(CURLWP)
1.58      ad       1055:
                   1056:        /* Skip the rest if returning to a pinned LWP. */
                   1057:        testl   %edx,%edx
                   1058:        jnz     4f
                   1059:
1.62      bouyer   1060: #ifdef XEN
                   1061:        pushl   %edi
                   1062:        call    _C_LABEL(i386_switch_context)
                   1063:        addl    $4,%esp
1.97      bouyer   1064: #else /* !XEN */
1.60      yamt     1065:        /* Switch ring0 esp */
                   1066:        movl    PCB_ESP0(%ebx),%eax
                   1067:        movl    %eax,CPUVAR(ESP0)
1.97      bouyer   1068: #endif /* !XEN */
1.1       fvdl     1069:
                   1070:        /* Don't bother with the rest if switching to a system process. */
1.48      yamt     1071:        testl   $LW_SYSTEM,L_FLAG(%edi)
                   1072:        jnz     4f
1.1       fvdl     1073:
1.97      bouyer   1074: #ifndef XEN
1.54      ad       1075:        /* Restore thread-private %fs/%gs descriptors. */
1.60      yamt     1076:        movl    CPUVAR(GDT),%ecx
1.55      ad       1077:        movl    PCB_FSD(%ebx), %eax
                   1078:        movl    PCB_FSD+4(%ebx), %edx
1.54      ad       1079:        movl    %eax, (GUFS_SEL*8)(%ecx)
                   1080:        movl    %edx, (GUFS_SEL*8+4)(%ecx)
1.55      ad       1081:        movl    PCB_GSD(%ebx), %eax
                   1082:        movl    PCB_GSD+4(%ebx), %edx
1.54      ad       1083:        movl    %eax, (GUGS_SEL*8)(%ecx)
                   1084:        movl    %edx, (GUGS_SEL*8+4)(%ecx)
1.97      bouyer   1085: #endif /* !XEN */
1.54      ad       1086:
1.60      yamt     1087:        /* Switch I/O bitmap */
                   1088:        movl    PCB_IOMAP(%ebx),%eax
                   1089:        orl     %eax,%eax
1.95      joerg    1090:        jnz     .Lcopy_iobitmap
1.60      yamt     1091:        movl    $(IOMAP_INVALOFF << 16),CPUVAR(IOBASE)
                   1092: .Liobitmap_done:
                   1093:
1.56      ad       1094:        /* Is this process using RAS (restartable atomic sequences)? */
                   1095:        movl    L_PROC(%edi),%eax
                   1096:        cmpl    $0,P_RASLIST(%eax)
                   1097:        jne     5f
                   1098:
1.48      yamt     1099:        /*
1.90      rmind    1100:         * Restore cr0 (including FPU state).  Raise the IPL to IPL_HIGH.
1.48      yamt     1101:         * FPU IPIs can alter the LWP's saved cr0.  Dropping the priority
                   1102:         * is deferred until mi_switch(), when cpu_switchto() returns.
                   1103:         */
1.62      bouyer   1104: 2:
1.97      bouyer   1105: #ifdef XEN
                   1106:        pushl   %edi
                   1107:        call    _C_LABEL(i386_tls_switch)
                   1108:        addl    $4,%esp
                   1109: #else /* !XEN */
1.108     christos 1110:        movl    $IPL_HIGH,CPUVAR(ILEVEL)
                   1111:        movl    PCB_CR0(%ebx),%ecx              /* has CR0_TS clear */
1.48      yamt     1112:        movl    %cr0,%edx
1.1       fvdl     1113:
1.108     christos 1114:        /*
                   1115:         * If our floating point registers are on a different CPU,
                   1116:         * set CR0_TS so we'll trap rather than reuse bogus state.
                   1117:         */
                   1118:        cmpl    CPUVAR(FPCURLWP),%edi
                   1119:        je      3f
                   1120:        orl     $CR0_TS,%ecx
                   1121:
1.48      yamt     1122:        /* Reloading CR0 is very expensive - avoid if possible. */
1.108     christos 1123: 3:     cmpl    %edx,%ecx
1.48      yamt     1124:        je      4f
1.1       fvdl     1125:        movl    %ecx,%cr0
1.97      bouyer   1126: #endif /* !XEN */
1.1       fvdl     1127:
1.48      yamt     1128:        /* Return to the new LWP, returning 'oldlwp' in %eax. */
                   1129: 4:     movl    %esi,%eax
1.1       fvdl     1130:        popl    %edi
                   1131:        popl    %esi
                   1132:        popl    %ebx
                   1133:        ret
1.20      dsl      1134:
1.48      yamt     1135:        /* Check for restartable atomic sequences (RAS). */
                   1136: 5:     movl    L_MD_REGS(%edi),%ecx
                   1137:        pushl   TF_EIP(%ecx)
1.20      dsl      1138:        pushl   %eax
                   1139:        call    _C_LABEL(ras_lookup)
                   1140:        addl    $8,%esp
                   1141:        cmpl    $-1,%eax
1.48      yamt     1142:        je      2b
1.49      ad       1143:        movl    L_MD_REGS(%edi),%ecx
                   1144:        movl    %eax,TF_EIP(%ecx)
1.48      yamt     1145:        jmp     2b
1.1       fvdl     1146:
1.60      yamt     1147: .Lcopy_iobitmap:
                   1148:        /* Copy I/O bitmap. */
1.86      ad       1149:        incl    _C_LABEL(pmap_iobmp_evcnt)+EV_COUNT
1.60      yamt     1150:        movl    $(IOMAPSIZE/4),%ecx
                   1151:        pushl   %esi
                   1152:        pushl   %edi
                   1153:        movl    %eax,%esi               /* pcb_iomap */
                   1154:        movl    CPUVAR(SELF),%edi
                   1155:        leal    CPU_INFO_IOMAP(%edi),%edi
                   1156:        rep
                   1157:        movsl
                   1158:        popl    %edi
                   1159:        popl    %esi
                   1160:        movl    $((CPU_INFO_IOMAP - CPU_INFO_TSS) << 16),CPUVAR(IOBASE)
                   1161:        jmp     .Liobitmap_done
1.72      yamt     1162: END(cpu_switchto)
1.60      yamt     1163:
1.1       fvdl     1164: /*
                   1165:  * void savectx(struct pcb *pcb);
1.48      yamt     1166:  *
1.1       fvdl     1167:  * Update pcb, saving current processor state.
                   1168:  */
                   1169: ENTRY(savectx)
1.115     maxv     1170:        movl    4(%esp),%edx            /* edx = pcb */
1.1       fvdl     1171:        movl    %esp,PCB_ESP(%edx)
                   1172:        movl    %ebp,PCB_EBP(%edx)
                   1173:        ret
1.72      yamt     1174: END(savectx)
1.1       fvdl     1175:
                   1176: /*
1.48      yamt     1177:  * osyscall()
                   1178:  *
1.1       fvdl     1179:  * Old call gate entry for syscall
                   1180:  */
                   1181: IDTVEC(osyscall)
1.87      ad       1182: #ifndef XEN
                   1183:        /* XXX we are in trouble! interrupts be off here. */
1.115     maxv     1184:        cli                     /* must be first instruction */
1.87      ad       1185: #endif
1.115     maxv     1186:        pushfl                  /* set eflags in trap frame */
1.1       fvdl     1187:        popl    8(%esp)
1.115     maxv     1188:        orl     $PSL_I,8(%esp)  /* re-enable ints on return to user */
                   1189:        pushl   $7              /* size of instruction for restart */
1.1       fvdl     1190:        jmp     syscall1
1.72      yamt     1191: IDTVEC_END(osyscall)
1.1       fvdl     1192:
                   1193: /*
1.48      yamt     1194:  * syscall()
                   1195:  *
1.1       fvdl     1196:  * Trap gate entry for syscall
                   1197:  */
                   1198: IDTVEC(syscall)
1.115     maxv     1199:        pushl   $2              /* size of instruction for restart */
1.1       fvdl     1200: syscall1:
1.115     maxv     1201:        pushl   $T_ASTFLT       /* trap # for doing ASTs */
1.1       fvdl     1202:        INTRENTRY
1.85      ad       1203:        STI(%eax)
1.1       fvdl     1204: #ifdef DIAGNOSTIC
                   1205:        movl    CPUVAR(ILEVEL),%ebx
                   1206:        testl   %ebx,%ebx
                   1207:        jz      1f
                   1208:        pushl   $5f
1.84      ad       1209:        call    _C_LABEL(panic)
1.1       fvdl     1210:        addl    $4,%esp
                   1211: #ifdef DDB
                   1212:        int     $3
                   1213: #endif
1.30      junyoung 1214: 1:
1.1       fvdl     1215: #endif /* DIAGNOSTIC */
1.115     maxv     1216:        addl    $1,CPUVAR(NSYSCALL)     /* count it atomically */
                   1217:        adcl    $0,CPUVAR(NSYSCALL)+4   /* count it atomically */
1.68      ad       1218:        movl    CPUVAR(CURLWP),%edi
                   1219:        movl    L_PROC(%edi),%edx
1.115     maxv     1220:        movl    %esp,L_MD_REGS(%edi)    /* save pointer to frame */
1.15      fvdl     1221:        pushl   %esp
1.115     maxv     1222:        call    *P_MD_SYSCALL(%edx)     /* get pointer to syscall() function */
1.15      fvdl     1223:        addl    $4,%esp
1.27      yamt     1224: .Lsyscall_checkast:
1.24      yamt     1225:        /* Check for ASTs on exit to user mode. */
1.62      bouyer   1226:        CLI(%eax)
1.68      ad       1227:        movl    L_MD_ASTPENDING(%edi), %eax
                   1228:        orl     CPUVAR(WANT_PMAPLOAD), %eax
1.24      yamt     1229:        jnz     9f
1.62      bouyer   1230: #ifdef XEN
                   1231:        STIC(%eax)
                   1232:        jz      14f
                   1233:        call    _C_LABEL(stipending)
                   1234:        testl   %eax,%eax
                   1235:        jz      14f
                   1236:        /* process pending interrupts */
                   1237:        CLI(%eax)
                   1238:        movl    CPUVAR(ILEVEL), %ebx
1.115     maxv     1239:        movl    $.Lsyscall_resume, %esi /* address to resume loop at */
1.62      bouyer   1240: .Lsyscall_resume:
1.115     maxv     1241:        movl    %ebx,%eax               /* get cpl */
1.62      bouyer   1242:        movl    CPUVAR(IUNMASK)(,%eax,4),%eax
1.115     maxv     1243:        andl    CPUVAR(IPENDING),%eax   /* any non-masked bits left? */
1.62      bouyer   1244:        jz      17f
                   1245:        bsrl    %eax,%eax
                   1246:        btrl    %eax,CPUVAR(IPENDING)
                   1247:        movl    CPUVAR(ISOURCES)(,%eax,4),%eax
                   1248:        jmp     *IS_RESUME(%eax)
1.115     maxv     1249: 17:    movl    %ebx, CPUVAR(ILEVEL)    /* restore cpl  */
1.62      bouyer   1250:        jmp     .Lsyscall_checkast
                   1251: 14:
                   1252: #endif /* XEN */
1.1       fvdl     1253: #ifndef DIAGNOSTIC
1.24      yamt     1254:        INTRFASTEXIT
1.1       fvdl     1255: #else /* DIAGNOSTIC */
1.24      yamt     1256:        cmpl    $IPL_NONE,CPUVAR(ILEVEL)
1.1       fvdl     1257:        jne     3f
                   1258:        INTRFASTEXIT
1.62      bouyer   1259: 3:     STI(%eax)
1.1       fvdl     1260:        pushl   $4f
1.84      ad       1261:        call    _C_LABEL(panic)
1.1       fvdl     1262:        addl    $4,%esp
1.58      ad       1263:        pushl   $IPL_NONE
                   1264:        call    _C_LABEL(spllower)
                   1265:        addl    $4,%esp
1.53      yamt     1266:        jmp     .Lsyscall_checkast
1.84      ad       1267: 4:     .asciz  "SPL NOT LOWERED ON SYSCALL EXIT\n"
                   1268: 5:     .asciz  "SPL NOT ZERO ON SYSCALL ENTRY\n"
1.1       fvdl     1269: #endif /* DIAGNOSTIC */
1.68      ad       1270: 9:
                   1271:        cmpl    $0, CPUVAR(WANT_PMAPLOAD)
                   1272:        jz      10f
                   1273:        STI(%eax)
1.24      yamt     1274:        call    _C_LABEL(pmap_load)
1.27      yamt     1275:        jmp     .Lsyscall_checkast      /* re-check ASTs */
1.68      ad       1276: 10:
                   1277:        /* Always returning to user mode here. */
                   1278:        movl    $0, L_MD_ASTPENDING(%edi)
                   1279:        STI(%eax)
                   1280:        /* Pushed T_ASTFLT into tf_trapno on entry. */
                   1281:        pushl   %esp
                   1282:        call    _C_LABEL(trap)
                   1283:        addl    $4,%esp
                   1284:        jmp     .Lsyscall_checkast      /* re-check ASTs */
1.72      yamt     1285: IDTVEC_END(syscall)
1.1       fvdl     1286:
1.81      ad       1287: IDTVEC(svr4_fasttrap)
1.115     maxv     1288:        pushl   $2              /* size of instruction for restart */
                   1289:        pushl   $T_ASTFLT       /* trap # for doing ASTs */
1.81      ad       1290:        INTRENTRY
1.85      ad       1291:        STI(%eax)
1.81      ad       1292:        pushl   $RW_READER
                   1293:        pushl   $_C_LABEL(svr4_fasttrap_lock)
                   1294:        call    _C_LABEL(rw_enter)
                   1295:        addl    $8,%esp
                   1296:        call    *_C_LABEL(svr4_fasttrap_vec)
                   1297:        pushl   $_C_LABEL(svr4_fasttrap_lock)
                   1298:        call    _C_LABEL(rw_exit)
                   1299:        addl    $4,%esp
                   1300: 2:     /* Check for ASTs on exit to user mode. */
                   1301:        cli
1.115     maxv     1302:        CHECK_ASTPENDING(%eax)
1.81      ad       1303:        je      1f
                   1304:        /* Always returning to user mode here. */
                   1305:        CLEAR_ASTPENDING(%eax)
                   1306:        sti
                   1307:        /* Pushed T_ASTFLT into tf_trapno on entry. */
                   1308:        pushl   %esp
                   1309:        call    _C_LABEL(trap)
                   1310:        addl    $4,%esp
                   1311:        jmp     2b
                   1312: 1:     CHECK_DEFERRED_SWITCH
                   1313:        jnz     9f
                   1314:        INTRFASTEXIT
                   1315: 9:     sti
                   1316:        call    _C_LABEL(pmap_load)
                   1317:        cli
                   1318:        jmp     2b
                   1319:
1.48      yamt     1320: /*
                   1321:  * int npx586bug1(int a, int b)
1.110     dsl      1322:  * Used when checking for the FDIV bug on first generations pentiums.
                   1323:  * Anything 120MHz or above is fine.
1.48      yamt     1324:  */
1.1       fvdl     1325: NENTRY(npx586bug1)
1.115     maxv     1326:        fildl   4(%esp)         /* x */
                   1327:        fildl   8(%esp)         /* y */
1.1       fvdl     1328:        fld     %st(1)
1.115     maxv     1329:        fdiv    %st(1),%st      /* x/y */
                   1330:        fmulp   %st,%st(1)      /* (x/y)*y */
                   1331:        fsubrp  %st,%st(1)      /* x-(x/y)*y */
1.1       fvdl     1332:        pushl   $0
                   1333:        fistpl  (%esp)
                   1334:        popl    %eax
                   1335:        ret
1.72      yamt     1336: END(npx586bug1)
1.50      ad       1337:
                   1338: /*
1.76      ad       1339:  * void sse2_idlezero_page(void *pg)
1.50      ad       1340:  *
1.76      ad       1341:  * Zero a page without polluting the cache.  Preemption must be
                   1342:  * disabled by the caller. Abort if a preemption is pending.
1.50      ad       1343:  */
1.76      ad       1344: ENTRY(sse2_idlezero_page)
1.50      ad       1345:        pushl   %ebp
                   1346:        movl    %esp,%ebp
                   1347:        movl    8(%esp), %edx
1.76      ad       1348:        movl    $(PAGE_SIZE/32), %ecx
1.50      ad       1349:        xorl    %eax, %eax
                   1350:        .align  16
                   1351: 1:
1.82      ad       1352:        testl   $RESCHED_KPREEMPT, CPUVAR(RESCHED)
1.76      ad       1353:        jnz     2f
1.50      ad       1354:        movnti  %eax, 0(%edx)
                   1355:        movnti  %eax, 4(%edx)
                   1356:        movnti  %eax, 8(%edx)
                   1357:        movnti  %eax, 12(%edx)
                   1358:        movnti  %eax, 16(%edx)
                   1359:        movnti  %eax, 20(%edx)
                   1360:        movnti  %eax, 24(%edx)
                   1361:        movnti  %eax, 28(%edx)
1.76      ad       1362:        addl    $32, %edx
1.75      ad       1363:        decl    %ecx
1.50      ad       1364:        jnz     1b
                   1365:        sfence
1.76      ad       1366:        incl    %eax
1.50      ad       1367:        pop     %ebp
                   1368:        ret
1.76      ad       1369: 2:
1.50      ad       1370:        sfence
                   1371:        popl    %ebp
                   1372:        ret
1.76      ad       1373: END(sse2_idlezero_page)

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