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Annotation of src/sys/arch/i386/i386/locore.S, Revision 1.130

1.127     maxv        1: /*     $NetBSD: locore.S,v 1.126 2016/05/29 09:16:12 maxv Exp $        */
1.53      yamt        2:
                      3: /*
                      4:  * Copyright-o-rama!
                      5:  */
                      6:
                      7: /*
1.127     maxv        8:  * Copyright (c) 1998, 2000, 2004, 2006, 2007, 2009, 2016
                      9:  * The NetBSD Foundation, Inc., All rights reserved.
                     10:  *
                     11:  * This code is derived from software contributed to The NetBSD Foundation
                     12:  * by Charles M. Hannum, by Andrew Doran and by Maxime Villard.
                     13:  *
                     14:  * Redistribution and use in source and binary forms, with or without
                     15:  * modification, are permitted provided that the following conditions
                     16:  * are met:
                     17:  * 1. Redistributions of source code must retain the above copyright
                     18:  *    notice, this list of conditions and the following disclaimer.
                     19:  * 2. Redistributions in binary form must reproduce the above copyright
                     20:  *    notice, this list of conditions and the following disclaimer in the
                     21:  *    documentation and/or other materials provided with the distribution.
                     22:  *
                     23:  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
                     24:  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
                     25:  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
                     26:  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
                     27:  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
                     28:  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
                     29:  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
                     30:  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
                     31:  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
                     32:  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
                     33:  * POSSIBILITY OF SUCH DAMAGE.
                     34:  */
                     35:
                     36: /*
1.62      bouyer     37:  * Copyright (c) 2006 Manuel Bouyer.
                     38:  *
                     39:  * Redistribution and use in source and binary forms, with or without
                     40:  * modification, are permitted provided that the following conditions
                     41:  * are met:
                     42:  * 1. Redistributions of source code must retain the above copyright
                     43:  *    notice, this list of conditions and the following disclaimer.
                     44:  * 2. Redistributions in binary form must reproduce the above copyright
                     45:  *    notice, this list of conditions and the following disclaimer in the
                     46:  *    documentation and/or other materials provided with the distribution.
                     47:  *
                     48:  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
                     49:  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
                     50:  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
                     51:  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
                     52:  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
                     53:  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
                     54:  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
                     55:  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
                     56:  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
                     57:  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
                     58:  *
                     59:  */
                     60:
                     61: /*
1.53      yamt       62:  * Copyright (c) 2001 Wasabi Systems, Inc.
                     63:  * All rights reserved.
                     64:  *
                     65:  * Written by Frank van der Linden for Wasabi Systems, Inc.
                     66:  *
                     67:  * Redistribution and use in source and binary forms, with or without
                     68:  * modification, are permitted provided that the following conditions
                     69:  * are met:
                     70:  * 1. Redistributions of source code must retain the above copyright
                     71:  *    notice, this list of conditions and the following disclaimer.
                     72:  * 2. Redistributions in binary form must reproduce the above copyright
                     73:  *    notice, this list of conditions and the following disclaimer in the
                     74:  *    documentation and/or other materials provided with the distribution.
                     75:  * 3. All advertising materials mentioning features or use of this software
                     76:  *    must display the following acknowledgement:
                     77:  *      This product includes software developed for the NetBSD Project by
                     78:  *      Wasabi Systems, Inc.
                     79:  * 4. The name of Wasabi Systems, Inc. may not be used to endorse
                     80:  *    or promote products derived from this software without specific prior
                     81:  *    written permission.
                     82:  *
                     83:  * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND
                     84:  * 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 WASABI SYSTEMS, INC
                     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:
1.1       fvdl       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>
1.127     maxv      131: __KERNEL_RCSID(0, "$NetBSD: locore.S,v 1.126 2016/05/29 09:16:12 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/segments.h>
                    151: #include <machine/specialreg.h>
                    152: #include <machine/trap.h>
                    153: #include <machine/i82489reg.h>
1.48      yamt      154: #include <machine/frameasm.h>
                    155: #include <machine/i82489reg.h>
1.127     maxv      156: #include <machine/cputypes.h>
                    157:
1.62      bouyer    158: #ifndef XEN
                    159: #include <machine/multiboot.h>
                    160: #endif
1.1       fvdl      161:
                    162: /* Get definitions for IOM_BEGIN, IOM_END, and IOM_SIZE */
                    163: #include <dev/isa/isareg.h>
                    164:
1.104     uebayasi  165: #ifndef XEN
                    166: #define        _RELOC(x)       ((x) - KERNBASE)
                    167: #else
                    168: #define        _RELOC(x)       ((x))
                    169: #endif /* XEN */
                    170: #define        RELOC(x)        _RELOC(_C_LABEL(x))
                    171:
1.119     maxv      172: /* 32bit version of PG_NX */
                    173: #define PG_NX32        0x80000000
                    174:
1.115     maxv      175: #ifndef PAE
                    176: #define        PROC0_PDIR_OFF  0
                    177: #else
                    178: #define PROC0_L3_OFF   0
                    179: #define PROC0_PDIR_OFF 1 * PAGE_SIZE
                    180: #endif
                    181:
                    182: #define        PROC0_STK_OFF   (PROC0_PDIR_OFF + PDP_SIZE * PAGE_SIZE)
                    183: #define        PROC0_PTP1_OFF  (PROC0_STK_OFF + UPAGES * PAGE_SIZE)
                    184:
                    185: /*
                    186:  * fillkpt - Fill in a kernel page table
                    187:  *     eax = pte (page frame | control | status)
                    188:  *     ebx = page table address
                    189:  *     ecx = number of pages to map
                    190:  *
                    191:  * For PAE, each entry is 8 bytes long: we must set the 4 upper bytes to 0.
                    192:  * This is done by the first instruction of fillkpt. In the non-PAE case, this
                    193:  * instruction just clears the page table entry.
                    194:  */
                    195: #define fillkpt        \
1.125     maxv      196:        cmpl    $0,%ecx                 ;       /* zero-sized? */       \
                    197:        je      2f                      ; \
1.115     maxv      198: 1:     movl    $0,(PDE_SIZE-4)(%ebx)   ;       /* upper 32 bits: 0 */  \
                    199:        movl    %eax,(%ebx)             ;       /* store phys addr */   \
                    200:        addl    $PDE_SIZE,%ebx          ;       /* next PTE/PDE */      \
                    201:        addl    $PAGE_SIZE,%eax         ;       /* next phys page */    \
1.125     maxv      202:        loop    1b                      ; \
                    203: 2:                                     ;
1.115     maxv      204:
1.118     maxv      205: /*
1.120     maxv      206:  * fillkpt_nox - Same as fillkpt, but sets the NX/XD bit.
                    207:  */
                    208: #define fillkpt_nox \
1.125     maxv      209:        cmpl    $0,%ecx                 ;       /* zero-sized? */       \
                    210:        je      2f                      ; \
1.120     maxv      211:        pushl   %ebp                    ; \
                    212:        movl    RELOC(nox_flag),%ebp    ; \
                    213: 1:     movl    %ebp,(PDE_SIZE-4)(%ebx) ;       /* upper 32 bits: NX */ \
                    214:        movl    %eax,(%ebx)             ;       /* store phys addr */   \
                    215:        addl    $PDE_SIZE,%ebx          ;       /* next PTE/PDE */      \
                    216:        addl    $PAGE_SIZE,%eax         ;       /* next phys page */    \
                    217:        loop    1b                      ; \
1.125     maxv      218:        popl    %ebp                    ; \
                    219: 2:                                     ;
1.120     maxv      220:
                    221: /*
1.129     maxv      222:  * fillkpt_blank - Fill in a kernel page table with blank entries
                    223:  *     ebx = page table address
                    224:  *     ecx = number of pages to map
                    225:  */
                    226: #define fillkpt_blank  \
                    227:        cmpl    $0,%ecx                 ;       /* zero-sized? */       \
                    228:        je      2f                      ; \
                    229: 1:     movl    $0,(PDE_SIZE-4)(%ebx)   ;       /* upper 32 bits: 0 */  \
                    230:        movl    $0,(%ebx)               ;       /* lower 32 bits: 0 */  \
                    231:        addl    $PDE_SIZE,%ebx          ;       /* next PTE/PDE */      \
                    232:        loop    1b                      ; \
                    233: 2:                                     ;
                    234:
                    235: /*
1.118     maxv      236:  * killkpt - Destroy a kernel page table
                    237:  *     ebx = page table address
                    238:  *     ecx = number of pages to destroy
                    239:  */
                    240: #define killkpt \
                    241: 1:     movl    $0,(PDE_SIZE-4)(%ebx)   ;       /* upper bits (for PAE) */ \
                    242:        movl    $0,(%ebx)               ; \
                    243:        addl    $PDE_SIZE,%ebx          ; \
                    244:        loop    1b                      ;
                    245:
1.115     maxv      246:
1.62      bouyer    247: #ifdef XEN
                    248: /*
                    249:  * Xen guest identifier and loader selection
                    250:  */
                    251: .section __xen_guest
                    252:        .ascii  "GUEST_OS=netbsd,GUEST_VER=3.0,XEN_VER=xen-3.0"
1.106     uebayasi  253:        .ascii  ",VIRT_BASE=0xc0000000" /* KERNBASE */
                    254:        .ascii  ",ELF_PADDR_OFFSET=0xc0000000" /* KERNBASE */
                    255:        .ascii  ",VIRT_ENTRY=0xc0100000" /* KERNTEXTOFF */
                    256:        .ascii  ",HYPERCALL_PAGE=0x00000101"
1.62      bouyer    257:                /* (???+HYPERCALL_PAGE_OFFSET)/PAGE_SIZE) */
1.66      bouyer    258: #ifdef PAE
1.106     uebayasi  259:        .ascii  ",PAE=yes[extended-cr3]"
1.66      bouyer    260: #endif
1.62      bouyer    261:        .ascii  ",LOADER=generic"
1.114     uebayasi  262: #if (NKSYMS || defined(DDB) || defined(MODULAR)) && !defined(makeoptions_COPY_SYMTAB)
1.62      bouyer    263:        .ascii  ",BSD_SYMTAB=yes"
                    264: #endif
                    265:        .byte   0
1.106     uebayasi  266: #endif /* XEN */
1.62      bouyer    267:
1.1       fvdl      268: /*
                    269:  * Initialization
                    270:  */
                    271:        .data
                    272:
1.30      junyoung  273:        .globl  _C_LABEL(lapic_tpr)
                    274:
1.1       fvdl      275: #if NLAPIC > 0
                    276: #ifdef __ELF__
1.7       thorpej   277:        .align  PAGE_SIZE
1.1       fvdl      278: #else
                    279:        .align  12
                    280: #endif
1.127     maxv      281:        .globl  _C_LABEL(local_apic)
                    282:        .globl  _C_LABEL(lapic_id)
                    283:
1.104     uebayasi  284:        .type   _C_LABEL(local_apic), @object
                    285: LABEL(local_apic)
1.1       fvdl      286:        .space  LAPIC_ID
1.104     uebayasi  287: END(local_apic)
                    288:        .type   _C_LABEL(lapic_id), @object
                    289: LABEL(lapic_id)
1.1       fvdl      290:        .long   0x00000000
1.106     uebayasi  291:        .space  LAPIC_TPRI-(LAPIC_ID+4)
1.104     uebayasi  292: END(lapic_id)
                    293:        .type   _C_LABEL(lapic_tpr), @object
                    294: LABEL(lapic_tpr)
1.106     uebayasi  295:        .space  LAPIC_PPRI-LAPIC_TPRI
1.104     uebayasi  296: END(lapic_tpr)
                    297:        .type   _C_LABEL(lapic_ppr), @object
1.30      junyoung  298: _C_LABEL(lapic_ppr):
1.1       fvdl      299:        .space  LAPIC_ISR-LAPIC_PPRI
1.104     uebayasi  300: END(lapic_ppr)
                    301:        .type   _C_LABEL(lapic_isr), @object
1.1       fvdl      302: _C_LABEL(lapic_isr):
1.7       thorpej   303:        .space  PAGE_SIZE-LAPIC_ISR
1.104     uebayasi  304: END(lapic_isr)
1.1       fvdl      305: #else
1.104     uebayasi  306:        .type   _C_LABEL(lapic_tpr), @object
                    307: LABEL(lapic_tpr)
1.1       fvdl      308:        .long 0
1.104     uebayasi  309: END(lapic_tpr)
1.1       fvdl      310: #endif
1.119     maxv      311:
1.127     maxv      312:        .globl  _C_LABEL(tablesize)
                    313:        .globl  _C_LABEL(nox_flag)
                    314:        .globl  _C_LABEL(cputype)
                    315:        .globl  _C_LABEL(cpuid_level)
                    316:        .globl  _C_LABEL(esym)
                    317:        .globl  _C_LABEL(eblob)
                    318:        .globl  _C_LABEL(atdevbase)
                    319:        .globl  _C_LABEL(PDPpaddr)
                    320:        .globl  _C_LABEL(lwp0uarea)
                    321:        .globl  _C_LABEL(gdt)
                    322:        .globl  _C_LABEL(idt)
                    323:
1.126     maxv      324:        .type   _C_LABEL(tablesize), @object
                    325: _C_LABEL(tablesize):   .long   0
                    326: END(tablesize)
1.119     maxv      327:        .type   _C_LABEL(nox_flag), @object
                    328: LABEL(nox_flag)                .long   0       /* 32bit NOX flag, set if supported */
                    329: END(nox_flag)
1.104     uebayasi  330:        .type   _C_LABEL(cputype), @object
1.115     maxv      331: LABEL(cputype)         .long   0       /* are we 80486, Pentium, or.. */
1.104     uebayasi  332: END(cputype)
                    333:        .type   _C_LABEL(cpuid_level), @object
1.128     maxv      334: LABEL(cpuid_level)     .long   -1      /* max. level accepted by cpuid instr */
1.104     uebayasi  335: END(cpuid_level)
                    336:        .type   _C_LABEL(atdevbase), @object
1.115     maxv      337: LABEL(atdevbase)       .long   0       /* location of start of iomem in virt */
1.104     uebayasi  338: END(atdevbase)
                    339:        .type   _C_LABEL(lwp0uarea), @object
                    340: LABEL(lwp0uarea)       .long   0
                    341: END(lwp0uarea)
                    342:        .type   _C_LABEL(PDPpaddr), @object
1.115     maxv      343: LABEL(PDPpaddr)                .long   0       /* paddr of PDP, for libkvm */
1.104     uebayasi  344: END(PDPpaddr)
1.115     maxv      345:
                    346:        /* Space for the temporary stack */
1.104     uebayasi  347:        .size   tmpstk, tmpstk - .
1.115     maxv      348:        .space  512
1.1       fvdl      349: tmpstk:
1.96      cherry    350: #ifdef XEN
1.115     maxv      351:        .align          PAGE_SIZE, 0x0  /* Align on page boundary */
1.104     uebayasi  352: LABEL(tmpgdt)
1.115     maxv      353:        .space          PAGE_SIZE       /* Xen expects a page */
1.104     uebayasi  354: END(tmpgdt)
1.96      cherry    355: #endif /* XEN */
1.1       fvdl      356:
                    357:        .text
                    358:        .globl  _C_LABEL(kernel_text)
                    359:        .set    _C_LABEL(kernel_text),KERNTEXTOFF
                    360:
1.104     uebayasi  361: ENTRY(start)
1.62      bouyer    362: #ifndef XEN
1.115     maxv      363:
                    364:        /* Warm boot */
                    365:        movw    $0x1234,0x472
                    366:
1.37      jmmv      367: #if defined(MULTIBOOT)
                    368:        jmp     1f
                    369:
                    370:        .align  4
                    371:        .globl  Multiboot_Header
                    372: _C_LABEL(Multiboot_Header):
1.44      jmmv      373: #define MULTIBOOT_HEADER_FLAGS (MULTIBOOT_HEADER_WANT_MEMORY)
1.37      jmmv      374:        .long   MULTIBOOT_HEADER_MAGIC
                    375:        .long   MULTIBOOT_HEADER_FLAGS
                    376:        .long   -(MULTIBOOT_HEADER_MAGIC + MULTIBOOT_HEADER_FLAGS)
                    377:
                    378: 1:
                    379:        /* Check if we are being executed by a Multiboot-compliant boot
                    380:         * loader. */
                    381:        cmpl    $MULTIBOOT_INFO_MAGIC,%eax
                    382:        jne     1f
                    383:
1.43      mrg       384:        /*
                    385:         * Indeed, a multiboot-compliant boot loader executed us.  We copy
1.37      jmmv      386:         * the received Multiboot information structure into kernel's data
                    387:         * space to process it later -- after we are relocated.  It will
1.43      mrg       388:         * be safer to run complex C code than doing it at this point.
                    389:         */
1.115     maxv      390:        pushl   %ebx            /* Address of Multiboot information */
1.37      jmmv      391:        call    _C_LABEL(multiboot_pre_reloc)
                    392:        addl    $4,%esp
1.38      jmmv      393:        jmp     2f
1.37      jmmv      394: #endif
                    395:
                    396: 1:
1.1       fvdl      397:        /*
1.38      jmmv      398:         * At this point, we know that a NetBSD-specific boot loader
1.117     maxv      399:         * booted this kernel.
                    400:         *
                    401:         * Load parameters from the stack (32 bits):
                    402:         *     boothowto, [bootdev], bootinfo, esym, biosextmem, biosbasemem
                    403:         * We are not interested in 'bootdev'.
1.1       fvdl      404:         */
1.117     maxv      405:
1.115     maxv      406:        addl    $4,%esp         /* Discard return address to boot loader */
1.38      jmmv      407:        call    _C_LABEL(native_loader)
                    408:        addl    $24,%esp
1.1       fvdl      409:
                    410: 2:
                    411:        /* First, reset the PSL. */
                    412:        pushl   $PSL_MBO
                    413:        popfl
                    414:
                    415:        /* Clear segment registers; always null in proc0. */
                    416:        xorl    %eax,%eax
                    417:        movw    %ax,%fs
                    418:        movw    %ax,%gs
                    419:
                    420:        /* Find out our CPU type. */
                    421:
                    422: try386:        /* Try to toggle alignment check flag; does not exist on 386. */
                    423:        pushfl
                    424:        popl    %eax
                    425:        movl    %eax,%ecx
                    426:        orl     $PSL_AC,%eax
                    427:        pushl   %eax
                    428:        popfl
                    429:        pushfl
                    430:        popl    %eax
                    431:        xorl    %ecx,%eax
                    432:        andl    $PSL_AC,%eax
                    433:        pushl   %ecx
                    434:        popfl
                    435:
                    436:        testl   %eax,%eax
                    437:        jnz     try486
                    438:
                    439:        /*
                    440:         * Try the test of a NexGen CPU -- ZF will not change on a DIV
                    441:         * instruction on a NexGen, it will on an i386.  Documented in
                    442:         * Nx586 Processor Recognition Application Note, NexGen, Inc.
                    443:         */
                    444:        movl    $0x5555,%eax
                    445:        xorl    %edx,%edx
                    446:        movl    $2,%ecx
                    447:        divl    %ecx
                    448:        jnz     is386
                    449:
                    450: isnx586:
                    451:        /*
                    452:         * Don't try cpuid, as Nx586s reportedly don't support the
                    453:         * PSL_ID bit.
                    454:         */
1.100     chs       455:        movl    $CPU_NX586,RELOC(cputype)
1.1       fvdl      456:        jmp     2f
                    457:
                    458: is386:
1.100     chs       459:        movl    $CPU_386,RELOC(cputype)
1.1       fvdl      460:        jmp     2f
                    461:
                    462: try486:        /* Try to toggle identification flag; does not exist on early 486s. */
                    463:        pushfl
                    464:        popl    %eax
                    465:        movl    %eax,%ecx
                    466:        xorl    $PSL_ID,%eax
                    467:        pushl   %eax
                    468:        popfl
                    469:        pushfl
                    470:        popl    %eax
                    471:        xorl    %ecx,%eax
                    472:        andl    $PSL_ID,%eax
                    473:        pushl   %ecx
                    474:        popfl
                    475:
                    476:        testl   %eax,%eax
                    477:        jnz     try586
1.100     chs       478: is486: movl    $CPU_486,RELOC(cputype)
1.1       fvdl      479:        /*
                    480:         * Check Cyrix CPU
                    481:         * Cyrix CPUs do not change the undefined flags following
                    482:         * execution of the divide instruction which divides 5 by 2.
                    483:         *
                    484:         * Note: CPUID is enabled on M2, so it passes another way.
                    485:         */
                    486:        pushfl
                    487:        movl    $0x5555, %eax
                    488:        xorl    %edx, %edx
                    489:        movl    $2, %ecx
                    490:        clc
                    491:        divl    %ecx
                    492:        jnc     trycyrix486
                    493:        popfl
                    494:        jmp 2f
                    495: trycyrix486:
1.115     maxv      496:        movl    $CPU_6x86,RELOC(cputype)        /* set CPU type */
1.1       fvdl      497:        /*
                    498:         * Check for Cyrix 486 CPU by seeing if the flags change during a
                    499:         * divide. This is documented in the Cx486SLC/e SMM Programmer's
                    500:         * Guide.
                    501:         */
                    502:        xorl    %edx,%edx
1.115     maxv      503:        cmpl    %edx,%edx               /* set flags to known state */
1.1       fvdl      504:        pushfl
1.115     maxv      505:        popl    %ecx                    /* store flags in ecx */
1.1       fvdl      506:        movl    $-1,%eax
                    507:        movl    $4,%ebx
1.115     maxv      508:        divl    %ebx                    /* do a long division */
1.1       fvdl      509:        pushfl
                    510:        popl    %eax
1.115     maxv      511:        xorl    %ecx,%eax               /* are the flags different? */
                    512:        testl   $0x8d5,%eax             /* only check C|PF|AF|Z|N|V */
                    513:        jne     2f                      /* yes; must be Cyrix 6x86 CPU */
                    514:        movl    $CPU_486DLC,RELOC(cputype)      /* set CPU type */
1.1       fvdl      515:
                    516: #ifndef CYRIX_CACHE_WORKS
                    517:        /* Disable caching of the ISA hole only. */
                    518:        invd
1.115     maxv      519:        movb    $CCR0,%al       /* Configuration Register index (CCR0) */
1.1       fvdl      520:        outb    %al,$0x22
                    521:        inb     $0x23,%al
                    522:        orb     $(CCR0_NC1|CCR0_BARB),%al
                    523:        movb    %al,%ah
                    524:        movb    $CCR0,%al
                    525:        outb    %al,$0x22
                    526:        movb    %ah,%al
                    527:        outb    %al,$0x23
                    528:        invd
                    529: #else /* CYRIX_CACHE_WORKS */
                    530:        /* Set cache parameters */
1.115     maxv      531:        invd                    /* Start with guaranteed clean cache */
                    532:        movb    $CCR0,%al       /* Configuration Register index (CCR0) */
1.1       fvdl      533:        outb    %al,$0x22
                    534:        inb     $0x23,%al
                    535:        andb    $~CCR0_NC0,%al
                    536: #ifndef CYRIX_CACHE_REALLY_WORKS
                    537:        orb     $(CCR0_NC1|CCR0_BARB),%al
                    538: #else
                    539:        orb     $CCR0_NC1,%al
                    540: #endif
                    541:        movb    %al,%ah
                    542:        movb    $CCR0,%al
                    543:        outb    %al,$0x22
                    544:        movb    %ah,%al
                    545:        outb    %al,$0x23
                    546:        /* clear non-cacheable region 1 */
                    547:        movb    $(NCR1+2),%al
                    548:        outb    %al,$0x22
                    549:        movb    $NCR_SIZE_0K,%al
                    550:        outb    %al,$0x23
                    551:        /* clear non-cacheable region 2 */
                    552:        movb    $(NCR2+2),%al
                    553:        outb    %al,$0x22
                    554:        movb    $NCR_SIZE_0K,%al
                    555:        outb    %al,$0x23
                    556:        /* clear non-cacheable region 3 */
                    557:        movb    $(NCR3+2),%al
                    558:        outb    %al,$0x22
                    559:        movb    $NCR_SIZE_0K,%al
                    560:        outb    %al,$0x23
                    561:        /* clear non-cacheable region 4 */
                    562:        movb    $(NCR4+2),%al
                    563:        outb    %al,$0x22
                    564:        movb    $NCR_SIZE_0K,%al
                    565:        outb    %al,$0x23
                    566:        /* enable caching in CR0 */
                    567:        movl    %cr0,%eax
                    568:        andl    $~(CR0_CD|CR0_NW),%eax
                    569:        movl    %eax,%cr0
                    570:        invd
                    571: #endif /* CYRIX_CACHE_WORKS */
                    572:
                    573:        jmp     2f
                    574:
                    575: try586:        /* Use the `cpuid' instruction. */
                    576:        xorl    %eax,%eax
                    577:        cpuid
1.73      ad        578:        movl    %eax,RELOC(cpuid_level)
1.1       fvdl      579:
1.122     maxv      580:        /*
                    581:         * Retrieve the NX/XD flag. We use the 32bit version of PG_NX.
                    582:         */
                    583:        movl    $0x80000001,%eax
                    584:        cpuid
                    585:        andl    $CPUID_NOX,%edx
                    586:        jz      no_NOX
                    587:        movl    $PG_NX32,RELOC(nox_flag)
                    588: no_NOX:
                    589:
1.1       fvdl      590: 2:
                    591:        /*
                    592:         * Finished with old stack; load new %esp now instead of later so we
                    593:         * can trace this code without having to worry about the trace trap
                    594:         * clobbering the memory test or the zeroing of the bss+bootstrap page
                    595:         * tables.
                    596:         *
                    597:         * The boot program should check:
                    598:         *      text+data <= &stack_variable - more_space_for_stack
                    599:         *      text+data+bss+pad+space_for_page_tables <= end_of_memory
1.115     maxv      600:         *
                    601:         * XXX: the gdt is in the carcass of the boot program so clearing
1.1       fvdl      602:         * the rest of memory is still not possible.
                    603:         */
1.115     maxv      604:        movl    $_RELOC(tmpstk),%esp
1.1       fvdl      605:
                    606: /*
1.117     maxv      607:  * There are two different layouts possible, depending on whether PAE is
                    608:  * enabled or not.
1.1       fvdl      609:  *
1.117     maxv      610:  * If PAE is not enabled, there are two levels of pages: PD -> PT. They will
                    611:  * be referred to as: L2 -> L1. L2 is 1 page long. The BOOTSTRAP TABLES have
                    612:  * the following layout:
                    613:  *     +-----+------------+----+
                    614:  *     | L2 -> PROC0 STK -> L1 |
                    615:  *     +-----+------------+----+
                    616:  *
                    617:  * If PAE is enabled, there are three levels of pages: PDP -> PD -> PT. They
                    618:  * will be referred to as: L3 -> L2 -> L1. L3 is 1 page long, L2 is 4 page
                    619:  * long. The BOOTSTRAP TABLES have the following layout:
                    620:  *     +-----+-----+------------+----+
                    621:  *     | L3 -> L2 -> PROC0 STK -> L1 |
                    622:  *     +-----+-----+------------+----+
                    623:  *
                    624:  * Virtual address space of the kernel in both cases:
                    625:  * +------+--------+------+-----+--------+---------------------+-----------
                    626:  * | TEXT | RODATA | DATA | BSS | [SYMS] | [PRELOADED MODULES] | BOOTSTRAP
                    627:  * +------+--------+------+-----+--------+---------------------+-----------
                    628:  *                             (1)      (2)                   (3)
                    629:  *
1.130   ! maxv      630:  * -------+-------------+
        !           631:  * TABLES | ISA I/O MEM |
        !           632:  * -------+-------------+
1.117     maxv      633:  *       (4)
1.93      jym       634:  *
1.117     maxv      635:  * PROC0 STK is obviously not linked as a page level. It just happens to be
                    636:  * caught between L2 and L1.
1.123     maxv      637:  *
                    638:  * Important note: the kernel segments are properly 4k-aligned
                    639:  * (see kern.ldscript), so there's no need to enforce alignment.
1.1       fvdl      640:  */
                    641:
1.117     maxv      642:        /* Find end of kernel image; brings us on (1). */
1.1       fvdl      643:        movl    $RELOC(end),%edi
1.71      ad        644:
1.114     uebayasi  645: #if (NKSYMS || defined(DDB) || defined(MODULAR)) && !defined(makeoptions_COPY_SYMTAB)
1.117     maxv      646:        /* Save the symbols (if loaded); brinds us on (2). */
1.1       fvdl      647:        movl    RELOC(esym),%eax
                    648:        testl   %eax,%eax
                    649:        jz      1f
1.35      yamt      650:        subl    $KERNBASE,%eax
1.1       fvdl      651:        movl    %eax,%edi
                    652: 1:
                    653: #endif
                    654:
1.117     maxv      655:        /* Skip over any modules/blobs; brings us on (3). */
1.71      ad        656:        movl    RELOC(eblob),%eax
                    657:        testl   %eax,%eax
                    658:        jz      1f
                    659:        subl    $KERNBASE,%eax
                    660:        movl    %eax,%edi
                    661: 1:
1.117     maxv      662:
                    663:        /* We are on (3). Align up for BOOTSTRAP TABLES. */
1.71      ad        664:        movl    %edi,%esi
1.115     maxv      665:        addl    $PGOFSET,%esi
1.1       fvdl      666:        andl    $~PGOFSET,%esi
                    667:
1.53      yamt      668:        /* nkptp[1] = (esi + ~L2_FRAME) >> L2_SHIFT + 1; */
                    669:        movl    %esi,%eax
                    670:        addl    $~L2_FRAME,%eax
                    671:        shrl    $L2_SHIFT,%eax
1.117     maxv      672:        incl    %eax            /* one more PTP for VAs stolen by bootstrap */
1.53      yamt      673: 1:     movl    %eax,RELOC(nkptp)+1*4
                    674:
1.93      jym       675:        /* tablesize = (PDP_SIZE + UPAGES + nkptp) << PGSHIFT; */
                    676:        addl    $(PDP_SIZE+UPAGES),%eax
                    677: #ifdef PAE
1.117     maxv      678:        incl    %eax            /* one more page for L3 */
1.93      jym       679:        shll    $PGSHIFT+1,%eax /* PTP tables are twice larger with PAE */
                    680: #else
1.53      yamt      681:        shll    $PGSHIFT,%eax
1.93      jym       682: #endif
1.53      yamt      683:        movl    %eax,RELOC(tablesize)
                    684:
1.117     maxv      685:        /* Ensure that nkptp covers BOOTSTRAP TABLES. */
1.53      yamt      686:        addl    %esi,%eax
                    687:        addl    $~L2_FRAME,%eax
                    688:        shrl    $L2_SHIFT,%eax
                    689:        incl    %eax
                    690:        cmpl    %eax,RELOC(nkptp)+1*4
                    691:        jnz     1b
                    692:
1.117     maxv      693:        /* Now, zero out the BOOTSTRAP TABLES (before filling them in). */
1.105     uebayasi  694:        movl    %esi,%edi
1.1       fvdl      695:        xorl    %eax,%eax
                    696:        cld
1.105     uebayasi  697:        movl    RELOC(tablesize),%ecx
                    698:        shrl    $2,%ecx
1.1       fvdl      699:        rep
1.117     maxv      700:        stosl                           /* copy eax -> edi */
1.1       fvdl      701:
                    702: /*
1.117     maxv      703:  * Build the page tables and levels. We go from L1 to L2/L3, and link the levels
                    704:  * together. Note: RELOC computes &addr - KERNBASE in 32 bits; the value can't
                    705:  * be > 4G, or we can't deal with it anyway, since we are in 32bit mode.
1.1       fvdl      706:  */
1.105     uebayasi  707:        /*
1.117     maxv      708:         * Build L1.
1.105     uebayasi  709:         */
1.117     maxv      710:        leal    (PROC0_PTP1_OFF)(%esi),%ebx
                    711:
                    712:        /* Skip the first MB. */
1.129     maxv      713:        movl    $(KERNTEXTOFF - KERNBASE),%ecx
                    714:        shrl    $PGSHIFT,%ecx
                    715:        fillkpt_blank
1.1       fvdl      716:
1.121     maxv      717:        /* Map the kernel text RX. */
1.129     maxv      718:        movl    $(KERNTEXTOFF - KERNBASE),%eax  /* start of TEXT */
1.121     maxv      719:        movl    $RELOC(__rodata_start),%ecx
1.1       fvdl      720:        subl    %eax,%ecx
                    721:        shrl    $PGSHIFT,%ecx
                    722:        orl     $(PG_V|PG_KR),%eax
                    723:        fillkpt
                    724:
1.121     maxv      725:        /* Map the kernel rodata R. */
                    726:        movl    $RELOC(__rodata_start),%eax
                    727:        movl    $RELOC(__data_start),%ecx
                    728:        subl    %eax,%ecx
                    729:        shrl    $PGSHIFT,%ecx
                    730:        orl     $(PG_V|PG_KR),%eax
                    731:        fillkpt_nox
                    732:
                    733:        /* Map the kernel data+bss RW. */
                    734:        movl    $RELOC(__data_start),%eax
                    735:        movl    $RELOC(__kernel_end),%ecx
                    736:        subl    %eax,%ecx
1.1       fvdl      737:        shrl    $PGSHIFT,%ecx
1.121     maxv      738:        orl     $(PG_V|PG_KW),%eax
                    739:        fillkpt_nox
                    740:
1.124     maxv      741:        /* Map [SYMS]+[PRELOADED MODULES] RWX. */
1.121     maxv      742:        movl    $RELOC(__kernel_end),%eax
                    743:        movl    %esi,%ecx               /* start of BOOTSTRAP TABLES */
1.124     maxv      744:        subl    %eax,%ecx
1.121     maxv      745:        shrl    $PGSHIFT,%ecx
                    746:        orl     $(PG_V|PG_KW),%eax
1.1       fvdl      747:        fillkpt
                    748:
1.124     maxv      749:        /* Map the BOOTSTRAP TABLES RW. */
                    750:        movl    %esi,%eax               /* start of BOOTSTRAP TABLES */
                    751:        movl    RELOC(tablesize),%ecx   /* length of BOOTSTRAP TABLES */
                    752:        shrl    $PGSHIFT,%ecx
                    753:        orl     $(PG_V|PG_KW),%eax
                    754:        fillkpt_nox
                    755:
1.130   ! maxv      756:        /* We are on (4). Map ISA I/O MEM RWX. */
        !           757:        movl    $IOM_BEGIN,%eax
        !           758:        movl    $IOM_SIZE,%ecx  /* size of ISA I/O MEM */
        !           759:        shrl    $PGSHIFT,%ecx
        !           760:        orl     $(PG_V|PG_KW/*|PG_N*/),%eax
1.1       fvdl      761:        fillkpt
                    762:
1.117     maxv      763:        /*
                    764:         * Build L2 for identity mapping. Linked to L1.
                    765:         */
1.105     uebayasi  766:        leal    (PROC0_PDIR_OFF)(%esi),%ebx
                    767:        leal    (PROC0_PTP1_OFF)(%esi),%eax
1.117     maxv      768:        orl     $(PG_V|PG_KW),%eax
1.105     uebayasi  769:        movl    RELOC(nkptp)+1*4,%ecx
1.1       fvdl      770:        fillkpt
                    771:
1.117     maxv      772:        /* Set up L2 entries for actual kernel mapping */
                    773:        leal    (PROC0_PDIR_OFF + L2_SLOT_KERNBASE * PDE_SIZE)(%esi),%ebx
1.105     uebayasi  774:        leal    (PROC0_PTP1_OFF)(%esi),%eax
1.117     maxv      775:        orl     $(PG_V|PG_KW),%eax
1.105     uebayasi  776:        movl    RELOC(nkptp)+1*4,%ecx
1.1       fvdl      777:        fillkpt
                    778:
                    779:        /* Install a PDE recursively mapping page directory as a page table! */
1.117     maxv      780:        leal    (PROC0_PDIR_OFF + PDIR_SLOT_PTE * PDE_SIZE)(%esi),%ebx
1.105     uebayasi  781:        leal    (PROC0_PDIR_OFF)(%esi),%eax
                    782:        orl     $(PG_V|PG_KW),%eax
1.93      jym       783:        movl    $PDP_SIZE,%ecx
                    784:        fillkpt
                    785:
                    786: #ifdef PAE
1.117     maxv      787:        /*
                    788:         * Build L3. Linked to L2.
                    789:         */
1.93      jym       790:        leal    (PROC0_L3_OFF)(%esi),%ebx
                    791:        leal    (PROC0_PDIR_OFF)(%esi),%eax
                    792:        orl     $(PG_V),%eax
                    793:        movl    $PDP_SIZE,%ecx
                    794:        fillkpt
                    795:
                    796:        /* Enable PAE mode */
                    797:        movl    %cr4,%eax
                    798:        orl     $CR4_PAE,%eax
                    799:        movl    %eax,%cr4
                    800: #endif
1.1       fvdl      801:
1.117     maxv      802:        /* Save physical address of L2. */
1.93      jym       803:        leal    (PROC0_PDIR_OFF)(%esi),%eax
                    804:        movl    %eax,RELOC(PDPpaddr)
1.1       fvdl      805:
1.93      jym       806:        /*
                    807:         * Startup checklist:
1.117     maxv      808:         * 1. Load %cr3 with pointer to L2 (or L3 for PAE).
1.93      jym       809:         */
1.117     maxv      810:        movl    %esi,%eax
                    811:        movl    %eax,%cr3
1.93      jym       812:
1.105     uebayasi  813:        /*
1.119     maxv      814:         * 2. Set NOX in EFER, if available.
                    815:         */
                    816:        movl    RELOC(nox_flag),%ebx
                    817:        cmpl    $0,%ebx
                    818:        je      skip_NOX
                    819:        movl    $MSR_EFER,%ecx
                    820:        rdmsr
                    821:        xorl    %eax,%eax
                    822:        orl     $(EFER_NXE),%eax
                    823:        wrmsr
                    824: skip_NOX:
                    825:
                    826:        /*
                    827:         * 3. Enable paging and the rest of it.
1.105     uebayasi  828:         */
1.115     maxv      829:        movl    %cr0,%eax
1.111     dsl       830:        orl     $(CR0_PE|CR0_PG|CR0_NE|CR0_TS|CR0_MP|CR0_WP|CR0_AM),%eax
1.115     maxv      831:        movl    %eax,%cr0
1.1       fvdl      832:
1.115     maxv      833:        pushl   $begin                  /* jump to high mem */
1.1       fvdl      834:        ret
                    835:
                    836: begin:
1.105     uebayasi  837:        /*
1.117     maxv      838:         * We have arrived. There's no need anymore for the identity mapping in
                    839:         * low memory, remove it.
1.105     uebayasi  840:         */
                    841:        movl    _C_LABEL(nkptp)+1*4,%ecx
1.115     maxv      842:        leal    (PROC0_PDIR_OFF)(%esi),%ebx     /* old, phys address of PDIR */
                    843:        addl    $(KERNBASE), %ebx               /* new, virt address of PDIR */
1.118     maxv      844:        killkpt
1.1       fvdl      845:
                    846:        /* Relocate atdevbase. */
1.53      yamt      847:        movl    $KERNBASE,%edx
                    848:        addl    _C_LABEL(tablesize),%edx
1.1       fvdl      849:        addl    %esi,%edx
                    850:        movl    %edx,_C_LABEL(atdevbase)
                    851:
                    852:        /* Set up bootstrap stack. */
1.105     uebayasi  853:        leal    (PROC0_STK_OFF+KERNBASE)(%esi),%eax
1.91      rmind     854:        movl    %eax,_C_LABEL(lwp0uarea)
1.112     dsl       855:        leal    (USPACE-FRAMESIZE)(%eax),%esp
1.115     maxv      856:        movl    %esi,PCB_CR3(%eax)      /* pcb->pcb_cr3 */
                    857:        xorl    %ebp,%ebp               /* mark end of frames */
1.1       fvdl      858:
1.37      jmmv      859: #if defined(MULTIBOOT)
                    860:        /* It is now safe to parse the Multiboot information structure
                    861:         * we saved before from C code.  Note that we cannot delay its
                    862:         * parsing any more because initgdt (called below) needs to make
                    863:         * use of this information. */
                    864:        call    _C_LABEL(multiboot_post_reloc)
                    865: #endif
                    866:
1.115     maxv      867:        subl    $NGDT*8, %esp           /* space for temporary gdt */
1.1       fvdl      868:        pushl   %esp
                    869:        call    _C_LABEL(initgdt)
                    870:        addl    $4,%esp
1.30      junyoung  871:
1.105     uebayasi  872:        movl    _C_LABEL(tablesize),%eax
1.115     maxv      873:        addl    %esi,%eax               /* skip past stack and page tables */
1.1       fvdl      874:
1.93      jym       875: #ifdef PAE
1.115     maxv      876:        pushl   $0      /* init386() expects a 64 bits paddr_t with PAE */
1.93      jym       877: #endif
1.1       fvdl      878:        pushl   %eax
1.115     maxv      879:        call    _C_LABEL(init386)       /* wire 386 chip for unix operation */
                    880:        addl    $PDE_SIZE,%esp          /* pop paddr_t */
                    881:        addl    $NGDT*8,%esp            /* pop temporary gdt */
1.1       fvdl      882:
                    883: #ifdef SAFARI_FIFO_HACK
                    884:        movb    $5,%al
                    885:        movw    $0x37b,%dx
                    886:        outb    %al,%dx
                    887:        movw    $0x37f,%dx
                    888:        inb     %dx,%al
                    889:        movb    %al,%cl
                    890:
                    891:        orb     $1,%cl
                    892:
                    893:        movb    $5,%al
                    894:        movw    $0x37b,%dx
                    895:        outb    %al,%dx
                    896:        movw    $0x37f,%dx
                    897:        movb    %cl,%al
                    898:        outb    %al,%dx
                    899: #endif /* SAFARI_FIFO_HACK */
                    900:
                    901:        call    _C_LABEL(main)
1.62      bouyer    902: #else /* XEN */
                    903:        /* First, reset the PSL. */
                    904:        pushl   $PSL_MBO
                    905:        popfl
                    906:
                    907:        cld
1.115     maxv      908:        movl    %esp, %ebx              /* save start of available space */
                    909:        movl    $_RELOC(tmpstk),%esp    /* bootstrap stack end location */
1.62      bouyer    910:
1.106     uebayasi  911:        /* Clear BSS. */
1.62      bouyer    912:        xorl    %eax,%eax
                    913:        movl    $RELOC(__bss_start),%edi
                    914:        movl    $RELOC(_end),%ecx
                    915:        subl    %edi,%ecx
                    916:        rep stosb
                    917:
                    918:        /* Copy the necessary stuff from start_info structure. */
1.105     uebayasi  919:        /* We need to copy shared_info early, so that sti/cli work */
1.62      bouyer    920:        movl    $RELOC(start_info_union),%edi
                    921:        movl    $128,%ecx
                    922:        rep movsl
                    923:
                    924:        /* Clear segment registers; always null in proc0. */
                    925:        xorl    %eax,%eax
                    926:        movw    %ax,%fs
                    927:        movw    %ax,%gs
                    928:        decl    %eax
1.73      ad        929:        movl    %eax,RELOC(cpuid_level)
1.62      bouyer    930:
                    931:        xorl    %eax,%eax
                    932:        cpuid
1.73      ad        933:        movl    %eax,RELOC(cpuid_level)
1.62      bouyer    934:
1.96      cherry    935:        /*
                    936:         * Use a temp page. We'll re- add it to uvm(9) once we're
                    937:         * done using it.
                    938:         */
                    939:        movl    $RELOC(tmpgdt), %eax
1.115     maxv      940:        pushl   %eax            /* start of temporary gdt */
1.96      cherry    941:        call    _C_LABEL(initgdt)
                    942:        addl    $4,%esp
                    943:
1.62      bouyer    944:        call    xen_pmap_bootstrap
1.92      jym       945:
1.62      bouyer    946:        /*
                    947:         * First avail returned by xen_pmap_bootstrap in %eax
                    948:         */
                    949:        movl    %eax, %esi;
1.91      rmind     950:        movl    %esi, _C_LABEL(lwp0uarea)
1.62      bouyer    951:
                    952:        /* Set up bootstrap stack. */
1.112     dsl       953:        leal    (USPACE-FRAMESIZE)(%eax),%esp
1.115     maxv      954:        xorl    %ebp,%ebp               /* mark end of frames */
1.62      bouyer    955:
                    956:        addl    $USPACE, %esi
1.115     maxv      957:        subl    $KERNBASE, %esi         /* init386 wants a physical address */
1.92      jym       958:
                    959: #ifdef PAE
1.115     maxv      960:        pushl   $0      /* init386() expects a 64 bits paddr_t with PAE */
1.92      jym       961: #endif
1.62      bouyer    962:        pushl   %esi
1.115     maxv      963:        call    _C_LABEL(init386)       /* wire 386 chip for unix operation */
                    964:        addl    $PDE_SIZE,%esp          /* pop paddr_t */
1.62      bouyer    965:        call    _C_LABEL(main)
1.106     uebayasi  966: #endif /* XEN */
1.104     uebayasi  967: END(start)
1.62      bouyer    968:
1.101     jym       969: #if defined(XEN)
1.62      bouyer    970: /* space for the hypercall call page */
                    971: #define HYPERCALL_PAGE_OFFSET 0x1000
                    972: .org HYPERCALL_PAGE_OFFSET
                    973: ENTRY(hypercall_page)
                    974: .skip 0x1000
1.104     uebayasi  975: END(hypercall_page)
1.62      bouyer    976:
                    977: /*
                    978:  * void lgdt_finish(void);
                    979:  * Finish load a new GDT pointer (do any necessary cleanup).
                    980:  * XXX It's somewhat questionable whether reloading all the segment registers
                    981:  * is necessary, since the actual descriptor data is not changed except by
                    982:  * process creation and exit, both of which clean up via task switches.  OTOH,
                    983:  * this only happens at run time when the GDT is resized.
                    984:  */
                    985: /* LINTSTUB: Func: void lgdt_finish(void) */
                    986: NENTRY(lgdt_finish)
                    987:        movl    $GSEL(GDATA_SEL, SEL_KPL),%eax
                    988:        movw    %ax,%ds
                    989:        movw    %ax,%es
                    990:        movw    %ax,%gs
                    991:        movw    %ax,%ss
                    992:        movl    $GSEL(GCPU_SEL, SEL_KPL),%eax
                    993:        movw    %ax,%fs
                    994:        /* Reload code selector by doing intersegment return. */
                    995:        popl    %eax
                    996:        pushl   $GSEL(GCODE_SEL, SEL_KPL)
                    997:        pushl   %eax
                    998:        lret
1.72      yamt      999: END(lgdt_finish)
1.62      bouyer   1000:
                   1001: #endif /* XEN */
1.1       fvdl     1002:
                   1003: /*
1.48      yamt     1004:  * void lwp_trampoline(void);
                   1005:  *
1.1       fvdl     1006:  * This is a trampoline function pushed onto the stack of a newly created
                   1007:  * process in order to do some additional setup.  The trampoline is entered by
1.109     christos 1008:  * cpu_switchto()ing to the process, so we abuse the callee-saved
                   1009:  * registers used by cpu_switchto() to store the information about the
                   1010:  * stub to call.
1.1       fvdl     1011:  * NOTE: This function does not have a normal calling sequence!
                   1012:  */
1.48      yamt     1013: NENTRY(lwp_trampoline)
1.68      ad       1014:        movl    %ebp,%edi       /* for .Lsyscall_checkast */
1.48      yamt     1015:        xorl    %ebp,%ebp
1.68      ad       1016:        pushl   %edi
1.48      yamt     1017:        pushl   %eax
                   1018:        call    _C_LABEL(lwp_startup)
                   1019:        addl    $8,%esp
1.1       fvdl     1020:        pushl   %ebx
                   1021:        call    *%esi
                   1022:        addl    $4,%esp
1.68      ad       1023:        jmp     .Lsyscall_checkast
1.1       fvdl     1024:        /* NOTREACHED */
1.72      yamt     1025: END(lwp_trampoline)
1.1       fvdl     1026:
                   1027: /*
1.48      yamt     1028:  * sigcode()
                   1029:  *
                   1030:  * Signal trampoline; copied to top of user stack.  Used only for
                   1031:  * compatibility with old releases of NetBSD.
1.1       fvdl     1032:  */
                   1033: NENTRY(sigcode)
                   1034:        /*
                   1035:         * Handler has returned here as if we called it.  The sigcontext
                   1036:         * is on the stack after the 3 args "we" pushed.
                   1037:         */
1.115     maxv     1038:        leal    12(%esp),%eax           /* get pointer to sigcontext */
                   1039:        movl    %eax,4(%esp)            /* put it in the argument slot */
                   1040:                                        /* fake return address already there */
1.17      christos 1041:        movl    $SYS_compat_16___sigreturn14,%eax
1.115     maxv     1042:        int     $0x80                   /* enter kernel with args on stack */
1.1       fvdl     1043:        movl    $SYS_exit,%eax
1.115     maxv     1044:        int     $0x80                   /* exit if sigreturn fails */
1.1       fvdl     1045:        .globl  _C_LABEL(esigcode)
                   1046: _C_LABEL(esigcode):
1.72      yamt     1047: END(sigcode)
1.1       fvdl     1048:
                   1049: /*
1.48      yamt     1050:  * int setjmp(label_t *)
                   1051:  *
                   1052:  * Used primarily by DDB.
1.1       fvdl     1053:  */
                   1054: ENTRY(setjmp)
                   1055:        movl    4(%esp),%eax
1.115     maxv     1056:        movl    %ebx,(%eax)             /* save ebx */
                   1057:        movl    %esp,4(%eax)            /* save esp */
                   1058:        movl    %ebp,8(%eax)            /* save ebp */
                   1059:        movl    %esi,12(%eax)           /* save esi */
                   1060:        movl    %edi,16(%eax)           /* save edi */
                   1061:        movl    (%esp),%edx             /* get rta */
                   1062:        movl    %edx,20(%eax)           /* save eip */
                   1063:        xorl    %eax,%eax               /* return 0 */
1.1       fvdl     1064:        ret
1.72      yamt     1065: END(setjmp)
1.1       fvdl     1066:
1.48      yamt     1067: /*
                   1068:  * int longjmp(label_t *)
                   1069:  *
                   1070:  * Used primarily by DDB.
                   1071:  */
1.1       fvdl     1072: ENTRY(longjmp)
                   1073:        movl    4(%esp),%eax
1.115     maxv     1074:        movl    (%eax),%ebx             /* restore ebx */
                   1075:        movl    4(%eax),%esp            /* restore esp */
                   1076:        movl    8(%eax),%ebp            /* restore ebp */
                   1077:        movl    12(%eax),%esi           /* restore esi */
                   1078:        movl    16(%eax),%edi           /* restore edi */
                   1079:        movl    20(%eax),%edx           /* get rta */
                   1080:        movl    %edx,(%esp)             /* put in return frame */
                   1081:        movl    $1,%eax                 /* return 1 */
1.1       fvdl     1082:        ret
1.72      yamt     1083: END(longjmp)
1.1       fvdl     1084:
1.65      skrll    1085: /*
                   1086:  * void dumpsys(void)
                   1087:  *
                   1088:  * Mimic cpu_switchto() for postmortem debugging.
                   1089:  */
1.64      skrll    1090: ENTRY(dumpsys)
1.115     maxv     1091:        pushl   %ebx                    /* set up fake switchframe */
                   1092:        pushl   %esi                    /* and save context */
                   1093:        pushl   %edi
1.65      skrll    1094:        movl    %esp,_C_LABEL(dumppcb)+PCB_ESP
                   1095:        movl    %ebp,_C_LABEL(dumppcb)+PCB_EBP
1.115     maxv     1096:        call    _C_LABEL(dodumpsys)     /* dump! */
                   1097:        addl    $(3*4), %esp            /* unwind switchframe */
1.64      skrll    1098:        ret
1.72      yamt     1099: END(dumpsys)
1.64      skrll    1100:
1.1       fvdl     1101: /*
1.106     uebayasi 1102:  * struct lwp *cpu_switchto(struct lwp *oldlwp, struct lwp *newlwp,
1.58      ad       1103:  *                         bool returning)
1.30      junyoung 1104:  *
1.48      yamt     1105:  *     1. if (oldlwp != NULL), save its context.
                   1106:  *     2. then, restore context of newlwp.
                   1107:  *
                   1108:  * Note that the stack frame layout is known to "struct switchframe" in
                   1109:  * <machine/frame.h> and to the code in cpu_lwp_fork() which initializes
1.5       thorpej  1110:  * it for a new lwp.
1.1       fvdl     1111:  */
1.48      yamt     1112: ENTRY(cpu_switchto)
1.1       fvdl     1113:        pushl   %ebx
                   1114:        pushl   %esi
                   1115:        pushl   %edi
                   1116:
1.70      ad       1117: #if defined(DIAGNOSTIC) && !defined(XEN)
                   1118:        cmpl    $IPL_SCHED,CPUVAR(ILEVEL)
                   1119:        jbe     0f
1.74      christos 1120:        pushl   CPUVAR(ILEVEL)
1.70      ad       1121:        pushl   $.Lstr
                   1122:        call    _C_LABEL(panic)
1.74      christos 1123:        addl    $8,%esp
                   1124: .Lstr: .string "cpu_switchto: switching above IPL_SCHED (%d)\0"
1.70      ad       1125: 0:
                   1126: #endif
                   1127:
1.115     maxv     1128:        movl    16(%esp),%esi           /* oldlwp */
                   1129:        movl    20(%esp),%edi           /* newlwp */
                   1130:        movl    24(%esp),%edx           /* returning */
1.48      yamt     1131:        testl   %esi,%esi
                   1132:        jz      1f
1.1       fvdl     1133:
1.48      yamt     1134:        /* Save old context. */
1.91      rmind    1135:        movl    L_PCB(%esi),%eax
1.48      yamt     1136:        movl    %esp,PCB_ESP(%eax)
                   1137:        movl    %ebp,PCB_EBP(%eax)
                   1138:
                   1139:        /* Switch to newlwp's stack. */
1.91      rmind    1140: 1:     movl    L_PCB(%edi),%ebx
1.48      yamt     1141:        movl    PCB_EBP(%ebx),%ebp
                   1142:        movl    PCB_ESP(%ebx),%esp
1.1       fvdl     1143:
1.61      ad       1144:        /*
                   1145:         * Set curlwp.  This must be globally visible in order to permit
                   1146:         * non-interlocked mutex release.
                   1147:         */
                   1148:        movl    %edi,%ecx
                   1149:        xchgl   %ecx,CPUVAR(CURLWP)
1.58      ad       1150:
                   1151:        /* Skip the rest if returning to a pinned LWP. */
                   1152:        testl   %edx,%edx
                   1153:        jnz     4f
                   1154:
1.62      bouyer   1155: #ifdef XEN
                   1156:        pushl   %edi
                   1157:        call    _C_LABEL(i386_switch_context)
                   1158:        addl    $4,%esp
1.97      bouyer   1159: #else /* !XEN */
1.60      yamt     1160:        /* Switch ring0 esp */
                   1161:        movl    PCB_ESP0(%ebx),%eax
                   1162:        movl    %eax,CPUVAR(ESP0)
1.97      bouyer   1163: #endif /* !XEN */
1.1       fvdl     1164:
                   1165:        /* Don't bother with the rest if switching to a system process. */
1.48      yamt     1166:        testl   $LW_SYSTEM,L_FLAG(%edi)
                   1167:        jnz     4f
1.1       fvdl     1168:
1.97      bouyer   1169: #ifndef XEN
1.54      ad       1170:        /* Restore thread-private %fs/%gs descriptors. */
1.60      yamt     1171:        movl    CPUVAR(GDT),%ecx
1.55      ad       1172:        movl    PCB_FSD(%ebx), %eax
                   1173:        movl    PCB_FSD+4(%ebx), %edx
1.54      ad       1174:        movl    %eax, (GUFS_SEL*8)(%ecx)
                   1175:        movl    %edx, (GUFS_SEL*8+4)(%ecx)
1.55      ad       1176:        movl    PCB_GSD(%ebx), %eax
                   1177:        movl    PCB_GSD+4(%ebx), %edx
1.54      ad       1178:        movl    %eax, (GUGS_SEL*8)(%ecx)
                   1179:        movl    %edx, (GUGS_SEL*8+4)(%ecx)
1.97      bouyer   1180: #endif /* !XEN */
1.54      ad       1181:
1.60      yamt     1182:        /* Switch I/O bitmap */
                   1183:        movl    PCB_IOMAP(%ebx),%eax
                   1184:        orl     %eax,%eax
1.95      joerg    1185:        jnz     .Lcopy_iobitmap
1.60      yamt     1186:        movl    $(IOMAP_INVALOFF << 16),CPUVAR(IOBASE)
                   1187: .Liobitmap_done:
                   1188:
1.56      ad       1189:        /* Is this process using RAS (restartable atomic sequences)? */
                   1190:        movl    L_PROC(%edi),%eax
                   1191:        cmpl    $0,P_RASLIST(%eax)
                   1192:        jne     5f
                   1193:
1.48      yamt     1194:        /*
1.90      rmind    1195:         * Restore cr0 (including FPU state).  Raise the IPL to IPL_HIGH.
1.48      yamt     1196:         * FPU IPIs can alter the LWP's saved cr0.  Dropping the priority
                   1197:         * is deferred until mi_switch(), when cpu_switchto() returns.
                   1198:         */
1.62      bouyer   1199: 2:
1.97      bouyer   1200: #ifdef XEN
                   1201:        pushl   %edi
                   1202:        call    _C_LABEL(i386_tls_switch)
                   1203:        addl    $4,%esp
                   1204: #else /* !XEN */
1.108     christos 1205:        movl    $IPL_HIGH,CPUVAR(ILEVEL)
                   1206:        movl    PCB_CR0(%ebx),%ecx              /* has CR0_TS clear */
1.48      yamt     1207:        movl    %cr0,%edx
1.1       fvdl     1208:
1.108     christos 1209:        /*
                   1210:         * If our floating point registers are on a different CPU,
                   1211:         * set CR0_TS so we'll trap rather than reuse bogus state.
                   1212:         */
                   1213:        cmpl    CPUVAR(FPCURLWP),%edi
                   1214:        je      3f
                   1215:        orl     $CR0_TS,%ecx
                   1216:
1.48      yamt     1217:        /* Reloading CR0 is very expensive - avoid if possible. */
1.108     christos 1218: 3:     cmpl    %edx,%ecx
1.48      yamt     1219:        je      4f
1.1       fvdl     1220:        movl    %ecx,%cr0
1.97      bouyer   1221: #endif /* !XEN */
1.1       fvdl     1222:
1.48      yamt     1223:        /* Return to the new LWP, returning 'oldlwp' in %eax. */
                   1224: 4:     movl    %esi,%eax
1.1       fvdl     1225:        popl    %edi
                   1226:        popl    %esi
                   1227:        popl    %ebx
                   1228:        ret
1.20      dsl      1229:
1.48      yamt     1230:        /* Check for restartable atomic sequences (RAS). */
                   1231: 5:     movl    L_MD_REGS(%edi),%ecx
                   1232:        pushl   TF_EIP(%ecx)
1.20      dsl      1233:        pushl   %eax
                   1234:        call    _C_LABEL(ras_lookup)
                   1235:        addl    $8,%esp
                   1236:        cmpl    $-1,%eax
1.48      yamt     1237:        je      2b
1.49      ad       1238:        movl    L_MD_REGS(%edi),%ecx
                   1239:        movl    %eax,TF_EIP(%ecx)
1.48      yamt     1240:        jmp     2b
1.1       fvdl     1241:
1.60      yamt     1242: .Lcopy_iobitmap:
                   1243:        /* Copy I/O bitmap. */
1.86      ad       1244:        incl    _C_LABEL(pmap_iobmp_evcnt)+EV_COUNT
1.60      yamt     1245:        movl    $(IOMAPSIZE/4),%ecx
                   1246:        pushl   %esi
                   1247:        pushl   %edi
                   1248:        movl    %eax,%esi               /* pcb_iomap */
                   1249:        movl    CPUVAR(SELF),%edi
                   1250:        leal    CPU_INFO_IOMAP(%edi),%edi
                   1251:        rep
                   1252:        movsl
                   1253:        popl    %edi
                   1254:        popl    %esi
                   1255:        movl    $((CPU_INFO_IOMAP - CPU_INFO_TSS) << 16),CPUVAR(IOBASE)
                   1256:        jmp     .Liobitmap_done
1.72      yamt     1257: END(cpu_switchto)
1.60      yamt     1258:
1.1       fvdl     1259: /*
                   1260:  * void savectx(struct pcb *pcb);
1.48      yamt     1261:  *
1.1       fvdl     1262:  * Update pcb, saving current processor state.
                   1263:  */
                   1264: ENTRY(savectx)
1.115     maxv     1265:        movl    4(%esp),%edx            /* edx = pcb */
1.1       fvdl     1266:        movl    %esp,PCB_ESP(%edx)
                   1267:        movl    %ebp,PCB_EBP(%edx)
                   1268:        ret
1.72      yamt     1269: END(savectx)
1.1       fvdl     1270:
                   1271: /*
1.48      yamt     1272:  * osyscall()
                   1273:  *
1.1       fvdl     1274:  * Old call gate entry for syscall
                   1275:  */
                   1276: IDTVEC(osyscall)
1.87      ad       1277: #ifndef XEN
                   1278:        /* XXX we are in trouble! interrupts be off here. */
1.115     maxv     1279:        cli                     /* must be first instruction */
1.87      ad       1280: #endif
1.115     maxv     1281:        pushfl                  /* set eflags in trap frame */
1.1       fvdl     1282:        popl    8(%esp)
1.115     maxv     1283:        orl     $PSL_I,8(%esp)  /* re-enable ints on return to user */
                   1284:        pushl   $7              /* size of instruction for restart */
1.1       fvdl     1285:        jmp     syscall1
1.72      yamt     1286: IDTVEC_END(osyscall)
1.1       fvdl     1287:
                   1288: /*
1.48      yamt     1289:  * syscall()
                   1290:  *
1.1       fvdl     1291:  * Trap gate entry for syscall
                   1292:  */
                   1293: IDTVEC(syscall)
1.115     maxv     1294:        pushl   $2              /* size of instruction for restart */
1.1       fvdl     1295: syscall1:
1.115     maxv     1296:        pushl   $T_ASTFLT       /* trap # for doing ASTs */
1.1       fvdl     1297:        INTRENTRY
1.85      ad       1298:        STI(%eax)
1.1       fvdl     1299: #ifdef DIAGNOSTIC
                   1300:        movl    CPUVAR(ILEVEL),%ebx
                   1301:        testl   %ebx,%ebx
                   1302:        jz      1f
                   1303:        pushl   $5f
1.84      ad       1304:        call    _C_LABEL(panic)
1.1       fvdl     1305:        addl    $4,%esp
                   1306: #ifdef DDB
                   1307:        int     $3
                   1308: #endif
1.30      junyoung 1309: 1:
1.1       fvdl     1310: #endif /* DIAGNOSTIC */
1.115     maxv     1311:        addl    $1,CPUVAR(NSYSCALL)     /* count it atomically */
                   1312:        adcl    $0,CPUVAR(NSYSCALL)+4   /* count it atomically */
1.68      ad       1313:        movl    CPUVAR(CURLWP),%edi
                   1314:        movl    L_PROC(%edi),%edx
1.115     maxv     1315:        movl    %esp,L_MD_REGS(%edi)    /* save pointer to frame */
1.15      fvdl     1316:        pushl   %esp
1.115     maxv     1317:        call    *P_MD_SYSCALL(%edx)     /* get pointer to syscall() function */
1.15      fvdl     1318:        addl    $4,%esp
1.27      yamt     1319: .Lsyscall_checkast:
1.24      yamt     1320:        /* Check for ASTs on exit to user mode. */
1.62      bouyer   1321:        CLI(%eax)
1.68      ad       1322:        movl    L_MD_ASTPENDING(%edi), %eax
                   1323:        orl     CPUVAR(WANT_PMAPLOAD), %eax
1.24      yamt     1324:        jnz     9f
1.62      bouyer   1325: #ifdef XEN
                   1326:        STIC(%eax)
                   1327:        jz      14f
                   1328:        call    _C_LABEL(stipending)
                   1329:        testl   %eax,%eax
                   1330:        jz      14f
                   1331:        /* process pending interrupts */
                   1332:        CLI(%eax)
                   1333:        movl    CPUVAR(ILEVEL), %ebx
1.115     maxv     1334:        movl    $.Lsyscall_resume, %esi /* address to resume loop at */
1.62      bouyer   1335: .Lsyscall_resume:
1.115     maxv     1336:        movl    %ebx,%eax               /* get cpl */
1.62      bouyer   1337:        movl    CPUVAR(IUNMASK)(,%eax,4),%eax
1.115     maxv     1338:        andl    CPUVAR(IPENDING),%eax   /* any non-masked bits left? */
1.62      bouyer   1339:        jz      17f
                   1340:        bsrl    %eax,%eax
                   1341:        btrl    %eax,CPUVAR(IPENDING)
                   1342:        movl    CPUVAR(ISOURCES)(,%eax,4),%eax
                   1343:        jmp     *IS_RESUME(%eax)
1.115     maxv     1344: 17:    movl    %ebx, CPUVAR(ILEVEL)    /* restore cpl  */
1.62      bouyer   1345:        jmp     .Lsyscall_checkast
                   1346: 14:
                   1347: #endif /* XEN */
1.1       fvdl     1348: #ifndef DIAGNOSTIC
1.24      yamt     1349:        INTRFASTEXIT
1.1       fvdl     1350: #else /* DIAGNOSTIC */
1.24      yamt     1351:        cmpl    $IPL_NONE,CPUVAR(ILEVEL)
1.1       fvdl     1352:        jne     3f
                   1353:        INTRFASTEXIT
1.62      bouyer   1354: 3:     STI(%eax)
1.1       fvdl     1355:        pushl   $4f
1.84      ad       1356:        call    _C_LABEL(panic)
1.1       fvdl     1357:        addl    $4,%esp
1.58      ad       1358:        pushl   $IPL_NONE
                   1359:        call    _C_LABEL(spllower)
                   1360:        addl    $4,%esp
1.53      yamt     1361:        jmp     .Lsyscall_checkast
1.84      ad       1362: 4:     .asciz  "SPL NOT LOWERED ON SYSCALL EXIT\n"
                   1363: 5:     .asciz  "SPL NOT ZERO ON SYSCALL ENTRY\n"
1.1       fvdl     1364: #endif /* DIAGNOSTIC */
1.68      ad       1365: 9:
                   1366:        cmpl    $0, CPUVAR(WANT_PMAPLOAD)
                   1367:        jz      10f
                   1368:        STI(%eax)
1.24      yamt     1369:        call    _C_LABEL(pmap_load)
1.27      yamt     1370:        jmp     .Lsyscall_checkast      /* re-check ASTs */
1.68      ad       1371: 10:
                   1372:        /* Always returning to user mode here. */
                   1373:        movl    $0, L_MD_ASTPENDING(%edi)
                   1374:        STI(%eax)
                   1375:        /* Pushed T_ASTFLT into tf_trapno on entry. */
                   1376:        pushl   %esp
                   1377:        call    _C_LABEL(trap)
                   1378:        addl    $4,%esp
                   1379:        jmp     .Lsyscall_checkast      /* re-check ASTs */
1.72      yamt     1380: IDTVEC_END(syscall)
1.1       fvdl     1381:
1.81      ad       1382: IDTVEC(svr4_fasttrap)
1.115     maxv     1383:        pushl   $2              /* size of instruction for restart */
                   1384:        pushl   $T_ASTFLT       /* trap # for doing ASTs */
1.81      ad       1385:        INTRENTRY
1.85      ad       1386:        STI(%eax)
1.81      ad       1387:        pushl   $RW_READER
                   1388:        pushl   $_C_LABEL(svr4_fasttrap_lock)
                   1389:        call    _C_LABEL(rw_enter)
                   1390:        addl    $8,%esp
                   1391:        call    *_C_LABEL(svr4_fasttrap_vec)
                   1392:        pushl   $_C_LABEL(svr4_fasttrap_lock)
                   1393:        call    _C_LABEL(rw_exit)
                   1394:        addl    $4,%esp
                   1395: 2:     /* Check for ASTs on exit to user mode. */
                   1396:        cli
1.115     maxv     1397:        CHECK_ASTPENDING(%eax)
1.81      ad       1398:        je      1f
                   1399:        /* Always returning to user mode here. */
                   1400:        CLEAR_ASTPENDING(%eax)
                   1401:        sti
                   1402:        /* Pushed T_ASTFLT into tf_trapno on entry. */
                   1403:        pushl   %esp
                   1404:        call    _C_LABEL(trap)
                   1405:        addl    $4,%esp
                   1406:        jmp     2b
                   1407: 1:     CHECK_DEFERRED_SWITCH
                   1408:        jnz     9f
                   1409:        INTRFASTEXIT
                   1410: 9:     sti
                   1411:        call    _C_LABEL(pmap_load)
                   1412:        cli
                   1413:        jmp     2b
                   1414:
1.48      yamt     1415: /*
                   1416:  * int npx586bug1(int a, int b)
1.110     dsl      1417:  * Used when checking for the FDIV bug on first generations pentiums.
                   1418:  * Anything 120MHz or above is fine.
1.48      yamt     1419:  */
1.1       fvdl     1420: NENTRY(npx586bug1)
1.115     maxv     1421:        fildl   4(%esp)         /* x */
                   1422:        fildl   8(%esp)         /* y */
1.1       fvdl     1423:        fld     %st(1)
1.115     maxv     1424:        fdiv    %st(1),%st      /* x/y */
                   1425:        fmulp   %st,%st(1)      /* (x/y)*y */
                   1426:        fsubrp  %st,%st(1)      /* x-(x/y)*y */
1.1       fvdl     1427:        pushl   $0
                   1428:        fistpl  (%esp)
                   1429:        popl    %eax
                   1430:        ret
1.72      yamt     1431: END(npx586bug1)
1.50      ad       1432:
                   1433: /*
1.76      ad       1434:  * void sse2_idlezero_page(void *pg)
1.50      ad       1435:  *
1.76      ad       1436:  * Zero a page without polluting the cache.  Preemption must be
                   1437:  * disabled by the caller. Abort if a preemption is pending.
1.50      ad       1438:  */
1.76      ad       1439: ENTRY(sse2_idlezero_page)
1.50      ad       1440:        pushl   %ebp
                   1441:        movl    %esp,%ebp
                   1442:        movl    8(%esp), %edx
1.76      ad       1443:        movl    $(PAGE_SIZE/32), %ecx
1.50      ad       1444:        xorl    %eax, %eax
                   1445:        .align  16
                   1446: 1:
1.82      ad       1447:        testl   $RESCHED_KPREEMPT, CPUVAR(RESCHED)
1.76      ad       1448:        jnz     2f
1.50      ad       1449:        movnti  %eax, 0(%edx)
                   1450:        movnti  %eax, 4(%edx)
                   1451:        movnti  %eax, 8(%edx)
                   1452:        movnti  %eax, 12(%edx)
                   1453:        movnti  %eax, 16(%edx)
                   1454:        movnti  %eax, 20(%edx)
                   1455:        movnti  %eax, 24(%edx)
                   1456:        movnti  %eax, 28(%edx)
1.76      ad       1457:        addl    $32, %edx
1.75      ad       1458:        decl    %ecx
1.50      ad       1459:        jnz     1b
                   1460:        sfence
1.76      ad       1461:        incl    %eax
1.50      ad       1462:        pop     %ebp
                   1463:        ret
1.76      ad       1464: 2:
1.50      ad       1465:        sfence
                   1466:        popl    %ebp
                   1467:        ret
1.76      ad       1468: END(sse2_idlezero_page)

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