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Annotation of src/sys/arch/i386/i386/locore.S, Revision 1.113.2.4

1.113.2.4! skrll       1: /*     $NetBSD: locore.S,v 1.113.2.3 2016/07/09 20:24:52 skrll Exp $   */
1.53      yamt        2:
                      3: /*
                      4:  * Copyright-o-rama!
                      5:  */
                      6:
                      7: /*
1.113.2.3  skrll       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>
1.113.2.4! skrll     131: __KERNEL_RCSID(0, "$NetBSD: locore.S,v 1.113.2.3 2016/07/09 20:24:52 skrll Exp $");
1.59      lukem     132:
1.18      christos  133: #include "opt_compat_oldboot.h"
1.113.2.1  skrll     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>
1.113.2.3  skrll     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:
1.113.2.2  skrll     172: /* 32bit version of PG_NX */
                    173: #define PG_NX32        0x80000000
                    174:
                    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        \
                    196:        cmpl    $0,%ecx                 ;       /* zero-sized? */       \
                    197:        je      2f                      ; \
                    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 */    \
                    202:        loop    1b                      ; \
                    203: 2:                                     ;
                    204:
                    205: /*
                    206:  * fillkpt_nox - Same as fillkpt, but sets the NX/XD bit.
                    207:  */
                    208: #define fillkpt_nox \
                    209:        cmpl    $0,%ecx                 ;       /* zero-sized? */       \
                    210:        je      2f                      ; \
                    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                      ; \
                    218:        popl    %ebp                    ; \
                    219: 2:                                     ;
                    220:
                    221: /*
1.113.2.3  skrll     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: /*
1.113.2.2  skrll     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:
                    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"
1.113.2.1  skrll     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
1.7       thorpej   276:        .align  PAGE_SIZE
1.113.2.3  skrll     277:        .globl  _C_LABEL(local_apic)
                    278:
1.104     uebayasi  279:        .type   _C_LABEL(local_apic), @object
                    280: LABEL(local_apic)
1.113.2.4! skrll     281:        .space  LAPIC_TPRI
1.104     uebayasi  282: END(local_apic)
                    283:        .type   _C_LABEL(lapic_tpr), @object
                    284: LABEL(lapic_tpr)
1.113.2.4! skrll     285:        .space  PAGE_SIZE-LAPIC_TPRI
1.104     uebayasi  286: END(lapic_tpr)
1.1       fvdl      287: #else
1.104     uebayasi  288:        .type   _C_LABEL(lapic_tpr), @object
                    289: LABEL(lapic_tpr)
1.1       fvdl      290:        .long 0
1.104     uebayasi  291: END(lapic_tpr)
1.1       fvdl      292: #endif
1.113.2.2  skrll     293:
1.113.2.3  skrll     294:        .globl  _C_LABEL(tablesize)
                    295:        .globl  _C_LABEL(nox_flag)
                    296:        .globl  _C_LABEL(cputype)
                    297:        .globl  _C_LABEL(cpuid_level)
                    298:        .globl  _C_LABEL(esym)
                    299:        .globl  _C_LABEL(eblob)
                    300:        .globl  _C_LABEL(atdevbase)
                    301:        .globl  _C_LABEL(PDPpaddr)
                    302:        .globl  _C_LABEL(lwp0uarea)
                    303:        .globl  _C_LABEL(gdt)
                    304:        .globl  _C_LABEL(idt)
                    305:
                    306:        .type   _C_LABEL(tablesize), @object
                    307: _C_LABEL(tablesize):   .long   0
                    308: END(tablesize)
1.113.2.2  skrll     309:        .type   _C_LABEL(nox_flag), @object
                    310: LABEL(nox_flag)                .long   0       /* 32bit NOX flag, set if supported */
                    311: END(nox_flag)
1.104     uebayasi  312:        .type   _C_LABEL(cputype), @object
1.113.2.2  skrll     313: LABEL(cputype)         .long   0       /* are we 80486, Pentium, or.. */
1.104     uebayasi  314: END(cputype)
                    315:        .type   _C_LABEL(cpuid_level), @object
1.113.2.3  skrll     316: LABEL(cpuid_level)     .long   -1      /* max. level accepted by cpuid instr */
1.104     uebayasi  317: END(cpuid_level)
                    318:        .type   _C_LABEL(atdevbase), @object
1.113.2.2  skrll     319: LABEL(atdevbase)       .long   0       /* location of start of iomem in virt */
1.104     uebayasi  320: END(atdevbase)
                    321:        .type   _C_LABEL(lwp0uarea), @object
                    322: LABEL(lwp0uarea)       .long   0
                    323: END(lwp0uarea)
                    324:        .type   _C_LABEL(PDPpaddr), @object
1.113.2.2  skrll     325: LABEL(PDPpaddr)                .long   0       /* paddr of PDP, for libkvm */
1.104     uebayasi  326: END(PDPpaddr)
1.113.2.2  skrll     327:
                    328:        /* Space for the temporary stack */
1.104     uebayasi  329:        .size   tmpstk, tmpstk - .
1.113.2.2  skrll     330:        .space  512
1.1       fvdl      331: tmpstk:
1.96      cherry    332: #ifdef XEN
1.113.2.2  skrll     333:        .align          PAGE_SIZE, 0x0  /* Align on page boundary */
1.104     uebayasi  334: LABEL(tmpgdt)
1.113.2.2  skrll     335:        .space          PAGE_SIZE       /* Xen expects a page */
1.104     uebayasi  336: END(tmpgdt)
1.96      cherry    337: #endif /* XEN */
1.1       fvdl      338:
                    339:        .text
                    340:        .globl  _C_LABEL(kernel_text)
                    341:        .set    _C_LABEL(kernel_text),KERNTEXTOFF
                    342:
1.104     uebayasi  343: ENTRY(start)
1.62      bouyer    344: #ifndef XEN
1.113.2.2  skrll     345:
                    346:        /* Warm boot */
                    347:        movw    $0x1234,0x472
                    348:
1.37      jmmv      349: #if defined(MULTIBOOT)
                    350:        jmp     1f
                    351:
                    352:        .align  4
                    353:        .globl  Multiboot_Header
                    354: _C_LABEL(Multiboot_Header):
1.44      jmmv      355: #define MULTIBOOT_HEADER_FLAGS (MULTIBOOT_HEADER_WANT_MEMORY)
1.37      jmmv      356:        .long   MULTIBOOT_HEADER_MAGIC
                    357:        .long   MULTIBOOT_HEADER_FLAGS
                    358:        .long   -(MULTIBOOT_HEADER_MAGIC + MULTIBOOT_HEADER_FLAGS)
                    359:
                    360: 1:
                    361:        /* Check if we are being executed by a Multiboot-compliant boot
                    362:         * loader. */
                    363:        cmpl    $MULTIBOOT_INFO_MAGIC,%eax
                    364:        jne     1f
                    365:
1.43      mrg       366:        /*
                    367:         * Indeed, a multiboot-compliant boot loader executed us.  We copy
1.37      jmmv      368:         * the received Multiboot information structure into kernel's data
                    369:         * space to process it later -- after we are relocated.  It will
1.43      mrg       370:         * be safer to run complex C code than doing it at this point.
                    371:         */
1.113.2.2  skrll     372:        pushl   %ebx            /* Address of Multiboot information */
1.37      jmmv      373:        call    _C_LABEL(multiboot_pre_reloc)
                    374:        addl    $4,%esp
1.38      jmmv      375:        jmp     2f
1.37      jmmv      376: #endif
                    377:
                    378: 1:
1.1       fvdl      379:        /*
1.38      jmmv      380:         * At this point, we know that a NetBSD-specific boot loader
1.113.2.2  skrll     381:         * booted this kernel.
                    382:         *
                    383:         * Load parameters from the stack (32 bits):
                    384:         *     boothowto, [bootdev], bootinfo, esym, biosextmem, biosbasemem
                    385:         * We are not interested in 'bootdev'.
1.1       fvdl      386:         */
1.113.2.2  skrll     387:
                    388:        addl    $4,%esp         /* Discard return address to boot loader */
1.38      jmmv      389:        call    _C_LABEL(native_loader)
                    390:        addl    $24,%esp
1.1       fvdl      391:
                    392: 2:
                    393:        /* First, reset the PSL. */
                    394:        pushl   $PSL_MBO
                    395:        popfl
                    396:
                    397:        /* Clear segment registers; always null in proc0. */
                    398:        xorl    %eax,%eax
                    399:        movw    %ax,%fs
                    400:        movw    %ax,%gs
                    401:
                    402:        /* Find out our CPU type. */
                    403:
                    404: try386:        /* Try to toggle alignment check flag; does not exist on 386. */
                    405:        pushfl
                    406:        popl    %eax
                    407:        movl    %eax,%ecx
                    408:        orl     $PSL_AC,%eax
                    409:        pushl   %eax
                    410:        popfl
                    411:        pushfl
                    412:        popl    %eax
                    413:        xorl    %ecx,%eax
                    414:        andl    $PSL_AC,%eax
                    415:        pushl   %ecx
                    416:        popfl
                    417:
                    418:        testl   %eax,%eax
                    419:        jnz     try486
                    420:
                    421:        /*
                    422:         * Try the test of a NexGen CPU -- ZF will not change on a DIV
                    423:         * instruction on a NexGen, it will on an i386.  Documented in
                    424:         * Nx586 Processor Recognition Application Note, NexGen, Inc.
                    425:         */
                    426:        movl    $0x5555,%eax
                    427:        xorl    %edx,%edx
                    428:        movl    $2,%ecx
                    429:        divl    %ecx
                    430:        jnz     is386
                    431:
                    432: isnx586:
                    433:        /*
                    434:         * Don't try cpuid, as Nx586s reportedly don't support the
                    435:         * PSL_ID bit.
                    436:         */
1.100     chs       437:        movl    $CPU_NX586,RELOC(cputype)
1.1       fvdl      438:        jmp     2f
                    439:
                    440: is386:
1.100     chs       441:        movl    $CPU_386,RELOC(cputype)
1.1       fvdl      442:        jmp     2f
                    443:
                    444: try486:        /* Try to toggle identification flag; does not exist on early 486s. */
                    445:        pushfl
                    446:        popl    %eax
                    447:        movl    %eax,%ecx
                    448:        xorl    $PSL_ID,%eax
                    449:        pushl   %eax
                    450:        popfl
                    451:        pushfl
                    452:        popl    %eax
                    453:        xorl    %ecx,%eax
                    454:        andl    $PSL_ID,%eax
                    455:        pushl   %ecx
                    456:        popfl
                    457:
                    458:        testl   %eax,%eax
                    459:        jnz     try586
1.100     chs       460: is486: movl    $CPU_486,RELOC(cputype)
1.1       fvdl      461:        /*
                    462:         * Check Cyrix CPU
                    463:         * Cyrix CPUs do not change the undefined flags following
                    464:         * execution of the divide instruction which divides 5 by 2.
                    465:         *
                    466:         * Note: CPUID is enabled on M2, so it passes another way.
                    467:         */
                    468:        pushfl
                    469:        movl    $0x5555, %eax
                    470:        xorl    %edx, %edx
                    471:        movl    $2, %ecx
                    472:        clc
                    473:        divl    %ecx
                    474:        jnc     trycyrix486
                    475:        popfl
                    476:        jmp 2f
                    477: trycyrix486:
1.113.2.2  skrll     478:        movl    $CPU_6x86,RELOC(cputype)        /* set CPU type */
1.1       fvdl      479:        /*
                    480:         * Check for Cyrix 486 CPU by seeing if the flags change during a
                    481:         * divide. This is documented in the Cx486SLC/e SMM Programmer's
                    482:         * Guide.
                    483:         */
                    484:        xorl    %edx,%edx
1.113.2.2  skrll     485:        cmpl    %edx,%edx               /* set flags to known state */
1.1       fvdl      486:        pushfl
1.113.2.2  skrll     487:        popl    %ecx                    /* store flags in ecx */
1.1       fvdl      488:        movl    $-1,%eax
                    489:        movl    $4,%ebx
1.113.2.2  skrll     490:        divl    %ebx                    /* do a long division */
1.1       fvdl      491:        pushfl
                    492:        popl    %eax
1.113.2.2  skrll     493:        xorl    %ecx,%eax               /* are the flags different? */
                    494:        testl   $0x8d5,%eax             /* only check C|PF|AF|Z|N|V */
                    495:        jne     2f                      /* yes; must be Cyrix 6x86 CPU */
                    496:        movl    $CPU_486DLC,RELOC(cputype)      /* set CPU type */
1.1       fvdl      497:
                    498: #ifndef CYRIX_CACHE_WORKS
                    499:        /* Disable caching of the ISA hole only. */
                    500:        invd
1.113.2.2  skrll     501:        movb    $CCR0,%al       /* Configuration Register index (CCR0) */
1.1       fvdl      502:        outb    %al,$0x22
                    503:        inb     $0x23,%al
                    504:        orb     $(CCR0_NC1|CCR0_BARB),%al
                    505:        movb    %al,%ah
                    506:        movb    $CCR0,%al
                    507:        outb    %al,$0x22
                    508:        movb    %ah,%al
                    509:        outb    %al,$0x23
                    510:        invd
                    511: #else /* CYRIX_CACHE_WORKS */
                    512:        /* Set cache parameters */
1.113.2.2  skrll     513:        invd                    /* Start with guaranteed clean cache */
                    514:        movb    $CCR0,%al       /* Configuration Register index (CCR0) */
1.1       fvdl      515:        outb    %al,$0x22
                    516:        inb     $0x23,%al
                    517:        andb    $~CCR0_NC0,%al
                    518: #ifndef CYRIX_CACHE_REALLY_WORKS
                    519:        orb     $(CCR0_NC1|CCR0_BARB),%al
                    520: #else
                    521:        orb     $CCR0_NC1,%al
                    522: #endif
                    523:        movb    %al,%ah
                    524:        movb    $CCR0,%al
                    525:        outb    %al,$0x22
                    526:        movb    %ah,%al
                    527:        outb    %al,$0x23
                    528:        /* clear non-cacheable region 1 */
                    529:        movb    $(NCR1+2),%al
                    530:        outb    %al,$0x22
                    531:        movb    $NCR_SIZE_0K,%al
                    532:        outb    %al,$0x23
                    533:        /* clear non-cacheable region 2 */
                    534:        movb    $(NCR2+2),%al
                    535:        outb    %al,$0x22
                    536:        movb    $NCR_SIZE_0K,%al
                    537:        outb    %al,$0x23
                    538:        /* clear non-cacheable region 3 */
                    539:        movb    $(NCR3+2),%al
                    540:        outb    %al,$0x22
                    541:        movb    $NCR_SIZE_0K,%al
                    542:        outb    %al,$0x23
                    543:        /* clear non-cacheable region 4 */
                    544:        movb    $(NCR4+2),%al
                    545:        outb    %al,$0x22
                    546:        movb    $NCR_SIZE_0K,%al
                    547:        outb    %al,$0x23
                    548:        /* enable caching in CR0 */
                    549:        movl    %cr0,%eax
                    550:        andl    $~(CR0_CD|CR0_NW),%eax
                    551:        movl    %eax,%cr0
                    552:        invd
                    553: #endif /* CYRIX_CACHE_WORKS */
                    554:
                    555:        jmp     2f
                    556:
                    557: try586:        /* Use the `cpuid' instruction. */
                    558:        xorl    %eax,%eax
                    559:        cpuid
1.73      ad        560:        movl    %eax,RELOC(cpuid_level)
1.1       fvdl      561:
1.113.2.2  skrll     562:        /*
                    563:         * Retrieve the NX/XD flag. We use the 32bit version of PG_NX.
                    564:         */
                    565:        movl    $0x80000001,%eax
                    566:        cpuid
                    567:        andl    $CPUID_NOX,%edx
                    568:        jz      no_NOX
                    569:        movl    $PG_NX32,RELOC(nox_flag)
                    570: no_NOX:
                    571:
1.1       fvdl      572: 2:
                    573:        /*
                    574:         * Finished with old stack; load new %esp now instead of later so we
                    575:         * can trace this code without having to worry about the trace trap
                    576:         * clobbering the memory test or the zeroing of the bss+bootstrap page
                    577:         * tables.
                    578:         *
                    579:         * The boot program should check:
                    580:         *      text+data <= &stack_variable - more_space_for_stack
                    581:         *      text+data+bss+pad+space_for_page_tables <= end_of_memory
1.113.2.2  skrll     582:         *
                    583:         * XXX: the gdt is in the carcass of the boot program so clearing
1.1       fvdl      584:         * the rest of memory is still not possible.
                    585:         */
1.113.2.2  skrll     586:        movl    $_RELOC(tmpstk),%esp
1.1       fvdl      587:
                    588: /*
1.113.2.2  skrll     589:  * There are two different layouts possible, depending on whether PAE is
                    590:  * enabled or not.
1.1       fvdl      591:  *
1.113.2.2  skrll     592:  * If PAE is not enabled, there are two levels of pages: PD -> PT. They will
                    593:  * be referred to as: L2 -> L1. L2 is 1 page long. The BOOTSTRAP TABLES have
                    594:  * the following layout:
                    595:  *     +-----+------------+----+
                    596:  *     | L2 -> PROC0 STK -> L1 |
                    597:  *     +-----+------------+----+
1.93      jym       598:  *
1.113.2.2  skrll     599:  * If PAE is enabled, there are three levels of pages: PDP -> PD -> PT. They
                    600:  * will be referred to as: L3 -> L2 -> L1. L3 is 1 page long, L2 is 4 page
                    601:  * long. The BOOTSTRAP TABLES have the following layout:
                    602:  *     +-----+-----+------------+----+
                    603:  *     | L3 -> L2 -> PROC0 STK -> L1 |
                    604:  *     +-----+-----+------------+----+
1.106     uebayasi  605:  *
1.113.2.2  skrll     606:  * Virtual address space of the kernel in both cases:
                    607:  * +------+--------+------+-----+--------+---------------------+-----------
                    608:  * | TEXT | RODATA | DATA | BSS | [SYMS] | [PRELOADED MODULES] | BOOTSTRAP
                    609:  * +------+--------+------+-----+--------+---------------------+-----------
                    610:  *                             (1)      (2)                   (3)
                    611:  *
1.113.2.3  skrll     612:  * -------+-------------+
                    613:  * TABLES | ISA I/O MEM |
                    614:  * -------+-------------+
1.113.2.2  skrll     615:  *       (4)
                    616:  *
                    617:  * PROC0 STK is obviously not linked as a page level. It just happens to be
                    618:  * caught between L2 and L1.
                    619:  *
                    620:  * Important note: the kernel segments are properly 4k-aligned
                    621:  * (see kern.ldscript), so there's no need to enforce alignment.
1.53      yamt      622:  */
                    623:
1.113.2.2  skrll     624:        /* Find end of kernel image; brings us on (1). */
1.1       fvdl      625:        movl    $RELOC(end),%edi
1.71      ad        626:
1.113.2.1  skrll     627: #if (NKSYMS || defined(DDB) || defined(MODULAR)) && !defined(makeoptions_COPY_SYMTAB)
1.113.2.2  skrll     628:        /* Save the symbols (if loaded); brinds us on (2). */
1.1       fvdl      629:        movl    RELOC(esym),%eax
                    630:        testl   %eax,%eax
                    631:        jz      1f
1.35      yamt      632:        subl    $KERNBASE,%eax
1.1       fvdl      633:        movl    %eax,%edi
                    634: 1:
                    635: #endif
                    636:
1.113.2.2  skrll     637:        /* Skip over any modules/blobs; brings us on (3). */
1.71      ad        638:        movl    RELOC(eblob),%eax
                    639:        testl   %eax,%eax
                    640:        jz      1f
                    641:        subl    $KERNBASE,%eax
                    642:        movl    %eax,%edi
                    643: 1:
1.113.2.2  skrll     644:
                    645:        /* We are on (3). Align up for BOOTSTRAP TABLES. */
1.71      ad        646:        movl    %edi,%esi
1.113.2.2  skrll     647:        addl    $PGOFSET,%esi
1.1       fvdl      648:        andl    $~PGOFSET,%esi
                    649:
1.53      yamt      650:        /* nkptp[1] = (esi + ~L2_FRAME) >> L2_SHIFT + 1; */
                    651:        movl    %esi,%eax
                    652:        addl    $~L2_FRAME,%eax
                    653:        shrl    $L2_SHIFT,%eax
1.113.2.2  skrll     654:        incl    %eax            /* one more PTP for VAs stolen by bootstrap */
1.53      yamt      655: 1:     movl    %eax,RELOC(nkptp)+1*4
                    656:
1.93      jym       657:        /* tablesize = (PDP_SIZE + UPAGES + nkptp) << PGSHIFT; */
                    658:        addl    $(PDP_SIZE+UPAGES),%eax
                    659: #ifdef PAE
1.113.2.2  skrll     660:        incl    %eax            /* one more page for L3 */
1.93      jym       661:        shll    $PGSHIFT+1,%eax /* PTP tables are twice larger with PAE */
                    662: #else
1.53      yamt      663:        shll    $PGSHIFT,%eax
1.93      jym       664: #endif
1.53      yamt      665:        movl    %eax,RELOC(tablesize)
                    666:
1.113.2.2  skrll     667:        /* Ensure that nkptp covers BOOTSTRAP TABLES. */
1.53      yamt      668:        addl    %esi,%eax
                    669:        addl    $~L2_FRAME,%eax
                    670:        shrl    $L2_SHIFT,%eax
                    671:        incl    %eax
                    672:        cmpl    %eax,RELOC(nkptp)+1*4
                    673:        jnz     1b
                    674:
1.113.2.2  skrll     675:        /* Now, zero out the BOOTSTRAP TABLES (before filling them in). */
1.105     uebayasi  676:        movl    %esi,%edi
1.1       fvdl      677:        xorl    %eax,%eax
                    678:        cld
1.105     uebayasi  679:        movl    RELOC(tablesize),%ecx
                    680:        shrl    $2,%ecx
1.1       fvdl      681:        rep
1.113.2.2  skrll     682:        stosl                           /* copy eax -> edi */
1.1       fvdl      683:
                    684: /*
1.113.2.2  skrll     685:  * Build the page tables and levels. We go from L1 to L2/L3, and link the levels
                    686:  * together. Note: RELOC computes &addr - KERNBASE in 32 bits; the value can't
                    687:  * be > 4G, or we can't deal with it anyway, since we are in 32bit mode.
1.1       fvdl      688:  */
1.105     uebayasi  689:        /*
1.113.2.2  skrll     690:         * Build L1.
1.105     uebayasi  691:         */
1.113.2.2  skrll     692:        leal    (PROC0_PTP1_OFF)(%esi),%ebx
1.30      junyoung  693:
1.113.2.2  skrll     694:        /* Skip the first MB. */
1.113.2.3  skrll     695:        movl    $(KERNTEXTOFF - KERNBASE),%ecx
                    696:        shrl    $PGSHIFT,%ecx
                    697:        fillkpt_blank
1.1       fvdl      698:
1.113.2.2  skrll     699:        /* Map the kernel text RX. */
1.113.2.3  skrll     700:        movl    $(KERNTEXTOFF - KERNBASE),%eax  /* start of TEXT */
1.113.2.2  skrll     701:        movl    $RELOC(__rodata_start),%ecx
1.1       fvdl      702:        subl    %eax,%ecx
                    703:        shrl    $PGSHIFT,%ecx
                    704:        orl     $(PG_V|PG_KR),%eax
                    705:        fillkpt
                    706:
1.113.2.2  skrll     707:        /* Map the kernel rodata R. */
                    708:        movl    $RELOC(__rodata_start),%eax
                    709:        movl    $RELOC(__data_start),%ecx
                    710:        subl    %eax,%ecx
                    711:        shrl    $PGSHIFT,%ecx
                    712:        orl     $(PG_V|PG_KR),%eax
                    713:        fillkpt_nox
                    714:
                    715:        /* Map the kernel data+bss RW. */
                    716:        movl    $RELOC(__data_start),%eax
                    717:        movl    $RELOC(__kernel_end),%ecx
                    718:        subl    %eax,%ecx
                    719:        shrl    $PGSHIFT,%ecx
                    720:        orl     $(PG_V|PG_KW),%eax
                    721:        fillkpt_nox
                    722:
1.113.2.3  skrll     723:        /* Map [SYMS]+[PRELOADED MODULES] RW. */
1.113.2.2  skrll     724:        movl    $RELOC(__kernel_end),%eax
                    725:        movl    %esi,%ecx               /* start of BOOTSTRAP TABLES */
                    726:        subl    %eax,%ecx
1.1       fvdl      727:        shrl    $PGSHIFT,%ecx
1.113.2.2  skrll     728:        orl     $(PG_V|PG_KW),%eax
1.113.2.3  skrll     729:        fillkpt_nox
1.1       fvdl      730:
1.113.2.2  skrll     731:        /* Map the BOOTSTRAP TABLES RW. */
                    732:        movl    %esi,%eax               /* start of BOOTSTRAP TABLES */
                    733:        movl    RELOC(tablesize),%ecx   /* length of BOOTSTRAP TABLES */
                    734:        shrl    $PGSHIFT,%ecx
                    735:        orl     $(PG_V|PG_KW),%eax
                    736:        fillkpt_nox
                    737:
1.113.2.3  skrll     738:        /* We are on (4). Map ISA I/O MEM RW. */
                    739:        movl    $IOM_BEGIN,%eax
                    740:        movl    $IOM_SIZE,%ecx  /* size of ISA I/O MEM */
                    741:        shrl    $PGSHIFT,%ecx
                    742:        orl     $(PG_V|PG_KW/*|PG_N*/),%eax
                    743:        fillkpt_nox
1.1       fvdl      744:
1.113.2.2  skrll     745:        /*
                    746:         * Build L2 for identity mapping. Linked to L1.
                    747:         */
1.105     uebayasi  748:        leal    (PROC0_PDIR_OFF)(%esi),%ebx
                    749:        leal    (PROC0_PTP1_OFF)(%esi),%eax
1.113.2.2  skrll     750:        orl     $(PG_V|PG_KW),%eax
1.105     uebayasi  751:        movl    RELOC(nkptp)+1*4,%ecx
1.1       fvdl      752:        fillkpt
                    753:
1.113.2.2  skrll     754:        /* Set up L2 entries for actual kernel mapping */
                    755:        leal    (PROC0_PDIR_OFF + L2_SLOT_KERNBASE * PDE_SIZE)(%esi),%ebx
1.105     uebayasi  756:        leal    (PROC0_PTP1_OFF)(%esi),%eax
1.113.2.2  skrll     757:        orl     $(PG_V|PG_KW),%eax
1.105     uebayasi  758:        movl    RELOC(nkptp)+1*4,%ecx
1.1       fvdl      759:        fillkpt
                    760:
1.113.2.3  skrll     761:        /* Install recursive top level PDE */
1.113.2.2  skrll     762:        leal    (PROC0_PDIR_OFF + PDIR_SLOT_PTE * PDE_SIZE)(%esi),%ebx
1.105     uebayasi  763:        leal    (PROC0_PDIR_OFF)(%esi),%eax
                    764:        orl     $(PG_V|PG_KW),%eax
1.93      jym       765:        movl    $PDP_SIZE,%ecx
1.113.2.3  skrll     766:        fillkpt_nox
1.93      jym       767:
                    768: #ifdef PAE
1.113.2.2  skrll     769:        /*
                    770:         * Build L3. Linked to L2.
                    771:         */
1.93      jym       772:        leal    (PROC0_L3_OFF)(%esi),%ebx
                    773:        leal    (PROC0_PDIR_OFF)(%esi),%eax
                    774:        orl     $(PG_V),%eax
                    775:        movl    $PDP_SIZE,%ecx
                    776:        fillkpt
                    777:
                    778:        /* Enable PAE mode */
                    779:        movl    %cr4,%eax
                    780:        orl     $CR4_PAE,%eax
                    781:        movl    %eax,%cr4
                    782: #endif
1.1       fvdl      783:
1.113.2.2  skrll     784:        /* Save physical address of L2. */
1.93      jym       785:        leal    (PROC0_PDIR_OFF)(%esi),%eax
                    786:        movl    %eax,RELOC(PDPpaddr)
1.1       fvdl      787:
1.93      jym       788:        /*
                    789:         * Startup checklist:
1.113.2.2  skrll     790:         * 1. Load %cr3 with pointer to L2 (or L3 for PAE).
1.93      jym       791:         */
1.113.2.2  skrll     792:        movl    %esi,%eax
                    793:        movl    %eax,%cr3
1.93      jym       794:
1.105     uebayasi  795:        /*
1.113.2.2  skrll     796:         * 2. Set NOX in EFER, if available.
1.105     uebayasi  797:         */
1.113.2.2  skrll     798:        movl    RELOC(nox_flag),%ebx
                    799:        cmpl    $0,%ebx
                    800:        je      skip_NOX
                    801:        movl    $MSR_EFER,%ecx
                    802:        rdmsr
                    803:        xorl    %eax,%eax
                    804:        orl     $(EFER_NXE),%eax
                    805:        wrmsr
                    806: skip_NOX:
                    807:
                    808:        /*
                    809:         * 3. Enable paging and the rest of it.
                    810:         */
                    811:        movl    %cr0,%eax
1.111     dsl       812:        orl     $(CR0_PE|CR0_PG|CR0_NE|CR0_TS|CR0_MP|CR0_WP|CR0_AM),%eax
1.113.2.2  skrll     813:        movl    %eax,%cr0
1.1       fvdl      814:
1.113.2.2  skrll     815:        pushl   $begin                  /* jump to high mem */
1.1       fvdl      816:        ret
                    817:
                    818: begin:
1.105     uebayasi  819:        /*
1.113.2.2  skrll     820:         * We have arrived. There's no need anymore for the identity mapping in
                    821:         * low memory, remove it.
1.105     uebayasi  822:         */
                    823:        movl    _C_LABEL(nkptp)+1*4,%ecx
1.113.2.2  skrll     824:        leal    (PROC0_PDIR_OFF)(%esi),%ebx     /* old, phys address of PDIR */
                    825:        addl    $(KERNBASE), %ebx               /* new, virt address of PDIR */
                    826:        killkpt
1.1       fvdl      827:
                    828:        /* Relocate atdevbase. */
1.53      yamt      829:        movl    $KERNBASE,%edx
                    830:        addl    _C_LABEL(tablesize),%edx
1.1       fvdl      831:        addl    %esi,%edx
                    832:        movl    %edx,_C_LABEL(atdevbase)
                    833:
                    834:        /* Set up bootstrap stack. */
1.105     uebayasi  835:        leal    (PROC0_STK_OFF+KERNBASE)(%esi),%eax
1.91      rmind     836:        movl    %eax,_C_LABEL(lwp0uarea)
1.112     dsl       837:        leal    (USPACE-FRAMESIZE)(%eax),%esp
1.113.2.2  skrll     838:        movl    %esi,PCB_CR3(%eax)      /* pcb->pcb_cr3 */
                    839:        xorl    %ebp,%ebp               /* mark end of frames */
1.1       fvdl      840:
1.37      jmmv      841: #if defined(MULTIBOOT)
                    842:        /* It is now safe to parse the Multiboot information structure
                    843:         * we saved before from C code.  Note that we cannot delay its
                    844:         * parsing any more because initgdt (called below) needs to make
                    845:         * use of this information. */
                    846:        call    _C_LABEL(multiboot_post_reloc)
                    847: #endif
                    848:
1.113.2.2  skrll     849:        subl    $NGDT*8, %esp           /* space for temporary gdt */
1.1       fvdl      850:        pushl   %esp
                    851:        call    _C_LABEL(initgdt)
                    852:        addl    $4,%esp
1.30      junyoung  853:
1.105     uebayasi  854:        movl    _C_LABEL(tablesize),%eax
1.113.2.2  skrll     855:        addl    %esi,%eax               /* skip past stack and page tables */
1.1       fvdl      856:
1.93      jym       857: #ifdef PAE
1.113.2.2  skrll     858:        pushl   $0      /* init386() expects a 64 bits paddr_t with PAE */
1.93      jym       859: #endif
1.1       fvdl      860:        pushl   %eax
1.113.2.2  skrll     861:        call    _C_LABEL(init386)       /* wire 386 chip for unix operation */
                    862:        addl    $PDE_SIZE,%esp          /* pop paddr_t */
                    863:        addl    $NGDT*8,%esp            /* pop temporary gdt */
1.1       fvdl      864:
                    865: #ifdef SAFARI_FIFO_HACK
                    866:        movb    $5,%al
                    867:        movw    $0x37b,%dx
                    868:        outb    %al,%dx
                    869:        movw    $0x37f,%dx
                    870:        inb     %dx,%al
                    871:        movb    %al,%cl
                    872:
                    873:        orb     $1,%cl
                    874:
                    875:        movb    $5,%al
                    876:        movw    $0x37b,%dx
                    877:        outb    %al,%dx
                    878:        movw    $0x37f,%dx
                    879:        movb    %cl,%al
                    880:        outb    %al,%dx
                    881: #endif /* SAFARI_FIFO_HACK */
                    882:
                    883:        call    _C_LABEL(main)
1.62      bouyer    884: #else /* XEN */
                    885:        /* First, reset the PSL. */
                    886:        pushl   $PSL_MBO
                    887:        popfl
                    888:
                    889:        cld
1.113.2.2  skrll     890:        movl    %esp, %ebx              /* save start of available space */
                    891:        movl    $_RELOC(tmpstk),%esp    /* bootstrap stack end location */
1.62      bouyer    892:
1.106     uebayasi  893:        /* Clear BSS. */
1.62      bouyer    894:        xorl    %eax,%eax
                    895:        movl    $RELOC(__bss_start),%edi
                    896:        movl    $RELOC(_end),%ecx
                    897:        subl    %edi,%ecx
                    898:        rep stosb
                    899:
                    900:        /* Copy the necessary stuff from start_info structure. */
1.105     uebayasi  901:        /* We need to copy shared_info early, so that sti/cli work */
1.62      bouyer    902:        movl    $RELOC(start_info_union),%edi
                    903:        movl    $128,%ecx
                    904:        rep movsl
                    905:
                    906:        /* Clear segment registers; always null in proc0. */
                    907:        xorl    %eax,%eax
                    908:        movw    %ax,%fs
                    909:        movw    %ax,%gs
                    910:        decl    %eax
1.73      ad        911:        movl    %eax,RELOC(cpuid_level)
1.62      bouyer    912:
                    913:        xorl    %eax,%eax
                    914:        cpuid
1.73      ad        915:        movl    %eax,RELOC(cpuid_level)
1.62      bouyer    916:
1.96      cherry    917:        /*
                    918:         * Use a temp page. We'll re- add it to uvm(9) once we're
                    919:         * done using it.
                    920:         */
                    921:        movl    $RELOC(tmpgdt), %eax
1.113.2.2  skrll     922:        pushl   %eax            /* start of temporary gdt */
1.96      cherry    923:        call    _C_LABEL(initgdt)
                    924:        addl    $4,%esp
                    925:
1.62      bouyer    926:        call    xen_pmap_bootstrap
1.92      jym       927:
1.62      bouyer    928:        /*
                    929:         * First avail returned by xen_pmap_bootstrap in %eax
                    930:         */
                    931:        movl    %eax, %esi;
1.91      rmind     932:        movl    %esi, _C_LABEL(lwp0uarea)
1.62      bouyer    933:
                    934:        /* Set up bootstrap stack. */
1.112     dsl       935:        leal    (USPACE-FRAMESIZE)(%eax),%esp
1.113.2.2  skrll     936:        xorl    %ebp,%ebp               /* mark end of frames */
1.62      bouyer    937:
                    938:        addl    $USPACE, %esi
1.113.2.2  skrll     939:        subl    $KERNBASE, %esi         /* init386 wants a physical address */
1.92      jym       940:
                    941: #ifdef PAE
1.113.2.2  skrll     942:        pushl   $0      /* init386() expects a 64 bits paddr_t with PAE */
1.92      jym       943: #endif
1.62      bouyer    944:        pushl   %esi
1.113.2.2  skrll     945:        call    _C_LABEL(init386)       /* wire 386 chip for unix operation */
                    946:        addl    $PDE_SIZE,%esp          /* pop paddr_t */
1.62      bouyer    947:        call    _C_LABEL(main)
1.106     uebayasi  948: #endif /* XEN */
1.104     uebayasi  949: END(start)
1.62      bouyer    950:
1.101     jym       951: #if defined(XEN)
1.62      bouyer    952: /* space for the hypercall call page */
                    953: #define HYPERCALL_PAGE_OFFSET 0x1000
                    954: .org HYPERCALL_PAGE_OFFSET
                    955: ENTRY(hypercall_page)
                    956: .skip 0x1000
1.104     uebayasi  957: END(hypercall_page)
1.62      bouyer    958:
                    959: /*
                    960:  * void lgdt_finish(void);
                    961:  * Finish load a new GDT pointer (do any necessary cleanup).
                    962:  * XXX It's somewhat questionable whether reloading all the segment registers
                    963:  * is necessary, since the actual descriptor data is not changed except by
                    964:  * process creation and exit, both of which clean up via task switches.  OTOH,
                    965:  * this only happens at run time when the GDT is resized.
                    966:  */
                    967: /* LINTSTUB: Func: void lgdt_finish(void) */
                    968: NENTRY(lgdt_finish)
                    969:        movl    $GSEL(GDATA_SEL, SEL_KPL),%eax
                    970:        movw    %ax,%ds
                    971:        movw    %ax,%es
                    972:        movw    %ax,%gs
                    973:        movw    %ax,%ss
                    974:        movl    $GSEL(GCPU_SEL, SEL_KPL),%eax
                    975:        movw    %ax,%fs
                    976:        /* Reload code selector by doing intersegment return. */
                    977:        popl    %eax
                    978:        pushl   $GSEL(GCODE_SEL, SEL_KPL)
                    979:        pushl   %eax
                    980:        lret
1.72      yamt      981: END(lgdt_finish)
1.62      bouyer    982:
                    983: #endif /* XEN */
1.1       fvdl      984:
                    985: /*
1.48      yamt      986:  * void lwp_trampoline(void);
                    987:  *
1.1       fvdl      988:  * This is a trampoline function pushed onto the stack of a newly created
                    989:  * process in order to do some additional setup.  The trampoline is entered by
1.109     christos  990:  * cpu_switchto()ing to the process, so we abuse the callee-saved
                    991:  * registers used by cpu_switchto() to store the information about the
                    992:  * stub to call.
1.1       fvdl      993:  * NOTE: This function does not have a normal calling sequence!
                    994:  */
1.48      yamt      995: NENTRY(lwp_trampoline)
1.68      ad        996:        movl    %ebp,%edi       /* for .Lsyscall_checkast */
1.48      yamt      997:        xorl    %ebp,%ebp
1.68      ad        998:        pushl   %edi
1.48      yamt      999:        pushl   %eax
                   1000:        call    _C_LABEL(lwp_startup)
                   1001:        addl    $8,%esp
1.1       fvdl     1002:        pushl   %ebx
                   1003:        call    *%esi
                   1004:        addl    $4,%esp
1.68      ad       1005:        jmp     .Lsyscall_checkast
1.1       fvdl     1006:        /* NOTREACHED */
1.72      yamt     1007: END(lwp_trampoline)
1.1       fvdl     1008:
                   1009: /*
1.48      yamt     1010:  * sigcode()
                   1011:  *
                   1012:  * Signal trampoline; copied to top of user stack.  Used only for
                   1013:  * compatibility with old releases of NetBSD.
1.1       fvdl     1014:  */
                   1015: NENTRY(sigcode)
                   1016:        /*
                   1017:         * Handler has returned here as if we called it.  The sigcontext
                   1018:         * is on the stack after the 3 args "we" pushed.
                   1019:         */
1.113.2.2  skrll    1020:        leal    12(%esp),%eax           /* get pointer to sigcontext */
                   1021:        movl    %eax,4(%esp)            /* put it in the argument slot */
                   1022:                                        /* fake return address already there */
1.17      christos 1023:        movl    $SYS_compat_16___sigreturn14,%eax
1.113.2.2  skrll    1024:        int     $0x80                   /* enter kernel with args on stack */
1.1       fvdl     1025:        movl    $SYS_exit,%eax
1.113.2.2  skrll    1026:        int     $0x80                   /* exit if sigreturn fails */
1.1       fvdl     1027:        .globl  _C_LABEL(esigcode)
                   1028: _C_LABEL(esigcode):
1.72      yamt     1029: END(sigcode)
1.1       fvdl     1030:
                   1031: /*
1.48      yamt     1032:  * int setjmp(label_t *)
                   1033:  *
                   1034:  * Used primarily by DDB.
1.1       fvdl     1035:  */
                   1036: ENTRY(setjmp)
                   1037:        movl    4(%esp),%eax
1.113.2.2  skrll    1038:        movl    %ebx,(%eax)             /* save ebx */
                   1039:        movl    %esp,4(%eax)            /* save esp */
                   1040:        movl    %ebp,8(%eax)            /* save ebp */
                   1041:        movl    %esi,12(%eax)           /* save esi */
                   1042:        movl    %edi,16(%eax)           /* save edi */
                   1043:        movl    (%esp),%edx             /* get rta */
                   1044:        movl    %edx,20(%eax)           /* save eip */
                   1045:        xorl    %eax,%eax               /* return 0 */
1.1       fvdl     1046:        ret
1.72      yamt     1047: END(setjmp)
1.1       fvdl     1048:
1.48      yamt     1049: /*
                   1050:  * int longjmp(label_t *)
                   1051:  *
                   1052:  * Used primarily by DDB.
                   1053:  */
1.1       fvdl     1054: ENTRY(longjmp)
                   1055:        movl    4(%esp),%eax
1.113.2.2  skrll    1056:        movl    (%eax),%ebx             /* restore ebx */
                   1057:        movl    4(%eax),%esp            /* restore esp */
                   1058:        movl    8(%eax),%ebp            /* restore ebp */
                   1059:        movl    12(%eax),%esi           /* restore esi */
                   1060:        movl    16(%eax),%edi           /* restore edi */
                   1061:        movl    20(%eax),%edx           /* get rta */
                   1062:        movl    %edx,(%esp)             /* put in return frame */
                   1063:        movl    $1,%eax                 /* return 1 */
1.1       fvdl     1064:        ret
1.72      yamt     1065: END(longjmp)
1.1       fvdl     1066:
1.65      skrll    1067: /*
                   1068:  * void dumpsys(void)
                   1069:  *
                   1070:  * Mimic cpu_switchto() for postmortem debugging.
                   1071:  */
1.64      skrll    1072: ENTRY(dumpsys)
1.113.2.2  skrll    1073:        pushl   %ebx                    /* set up fake switchframe */
                   1074:        pushl   %esi                    /* and save context */
                   1075:        pushl   %edi
1.65      skrll    1076:        movl    %esp,_C_LABEL(dumppcb)+PCB_ESP
                   1077:        movl    %ebp,_C_LABEL(dumppcb)+PCB_EBP
1.113.2.2  skrll    1078:        call    _C_LABEL(dodumpsys)     /* dump! */
                   1079:        addl    $(3*4), %esp            /* unwind switchframe */
1.64      skrll    1080:        ret
1.72      yamt     1081: END(dumpsys)
1.64      skrll    1082:
1.1       fvdl     1083: /*
1.106     uebayasi 1084:  * struct lwp *cpu_switchto(struct lwp *oldlwp, struct lwp *newlwp,
1.113.2.3  skrll    1085:  *     bool returning)
1.30      junyoung 1086:  *
1.48      yamt     1087:  *     1. if (oldlwp != NULL), save its context.
                   1088:  *     2. then, restore context of newlwp.
                   1089:  *
                   1090:  * Note that the stack frame layout is known to "struct switchframe" in
                   1091:  * <machine/frame.h> and to the code in cpu_lwp_fork() which initializes
1.5       thorpej  1092:  * it for a new lwp.
1.1       fvdl     1093:  */
1.48      yamt     1094: ENTRY(cpu_switchto)
1.1       fvdl     1095:        pushl   %ebx
                   1096:        pushl   %esi
                   1097:        pushl   %edi
                   1098:
1.70      ad       1099: #if defined(DIAGNOSTIC) && !defined(XEN)
                   1100:        cmpl    $IPL_SCHED,CPUVAR(ILEVEL)
                   1101:        jbe     0f
1.74      christos 1102:        pushl   CPUVAR(ILEVEL)
1.70      ad       1103:        pushl   $.Lstr
                   1104:        call    _C_LABEL(panic)
1.74      christos 1105:        addl    $8,%esp
                   1106: .Lstr: .string "cpu_switchto: switching above IPL_SCHED (%d)\0"
1.70      ad       1107: 0:
                   1108: #endif
                   1109:
1.113.2.2  skrll    1110:        movl    16(%esp),%esi           /* oldlwp */
                   1111:        movl    20(%esp),%edi           /* newlwp */
                   1112:        movl    24(%esp),%edx           /* returning */
1.113.2.3  skrll    1113:
                   1114:        testl   %esi,%esi               /* oldlwp = NULL ? */
                   1115:        jz      skip_save
1.1       fvdl     1116:
1.48      yamt     1117:        /* Save old context. */
1.91      rmind    1118:        movl    L_PCB(%esi),%eax
1.48      yamt     1119:        movl    %esp,PCB_ESP(%eax)
                   1120:        movl    %ebp,PCB_EBP(%eax)
1.113.2.3  skrll    1121: skip_save:
1.48      yamt     1122:
                   1123:        /* Switch to newlwp's stack. */
1.113.2.3  skrll    1124:        movl    L_PCB(%edi),%ebx
1.48      yamt     1125:        movl    PCB_EBP(%ebx),%ebp
                   1126:        movl    PCB_ESP(%ebx),%esp
1.1       fvdl     1127:
1.61      ad       1128:        /*
                   1129:         * Set curlwp.  This must be globally visible in order to permit
                   1130:         * non-interlocked mutex release.
                   1131:         */
                   1132:        movl    %edi,%ecx
                   1133:        xchgl   %ecx,CPUVAR(CURLWP)
1.58      ad       1134:
                   1135:        /* Skip the rest if returning to a pinned LWP. */
                   1136:        testl   %edx,%edx
1.113.2.3  skrll    1137:        jnz     switch_return
1.58      ad       1138:
1.113.2.3  skrll    1139:        /* Switch ring0 stack */
1.62      bouyer   1140: #ifdef XEN
                   1141:        pushl   %edi
                   1142:        call    _C_LABEL(i386_switch_context)
                   1143:        addl    $4,%esp
1.113.2.3  skrll    1144: #else
1.60      yamt     1145:        movl    PCB_ESP0(%ebx),%eax
                   1146:        movl    %eax,CPUVAR(ESP0)
1.113.2.3  skrll    1147: #endif
1.1       fvdl     1148:
                   1149:        /* Don't bother with the rest if switching to a system process. */
1.48      yamt     1150:        testl   $LW_SYSTEM,L_FLAG(%edi)
1.113.2.3  skrll    1151:        jnz     switch_return
1.1       fvdl     1152:
1.97      bouyer   1153: #ifndef XEN
1.54      ad       1154:        /* Restore thread-private %fs/%gs descriptors. */
1.60      yamt     1155:        movl    CPUVAR(GDT),%ecx
1.113.2.3  skrll    1156:        movl    PCB_FSD(%ebx),%eax
                   1157:        movl    PCB_FSD+4(%ebx),%edx
                   1158:        movl    %eax,(GUFS_SEL*8)(%ecx)
                   1159:        movl    %edx,(GUFS_SEL*8+4)(%ecx)
                   1160:        movl    PCB_GSD(%ebx),%eax
                   1161:        movl    PCB_GSD+4(%ebx),%edx
                   1162:        movl    %eax,(GUGS_SEL*8)(%ecx)
                   1163:        movl    %edx,(GUGS_SEL*8+4)(%ecx)
1.97      bouyer   1164: #endif /* !XEN */
1.54      ad       1165:
1.60      yamt     1166:        /* Switch I/O bitmap */
                   1167:        movl    PCB_IOMAP(%ebx),%eax
                   1168:        orl     %eax,%eax
1.95      joerg    1169:        jnz     .Lcopy_iobitmap
1.60      yamt     1170:        movl    $(IOMAP_INVALOFF << 16),CPUVAR(IOBASE)
                   1171: .Liobitmap_done:
                   1172:
1.56      ad       1173:        /* Is this process using RAS (restartable atomic sequences)? */
                   1174:        movl    L_PROC(%edi),%eax
                   1175:        cmpl    $0,P_RASLIST(%eax)
1.113.2.3  skrll    1176:        je      no_RAS
                   1177:
                   1178:        /* Handle restartable atomic sequences (RAS). */
                   1179:        movl    L_MD_REGS(%edi),%ecx
                   1180:        pushl   TF_EIP(%ecx)
                   1181:        pushl   %eax
                   1182:        call    _C_LABEL(ras_lookup)
                   1183:        addl    $8,%esp
                   1184:        cmpl    $-1,%eax
                   1185:        je      no_RAS
                   1186:        movl    L_MD_REGS(%edi),%ecx
                   1187:        movl    %eax,TF_EIP(%ecx)
                   1188: no_RAS:
1.56      ad       1189:
1.48      yamt     1190:        /*
1.90      rmind    1191:         * Restore cr0 (including FPU state).  Raise the IPL to IPL_HIGH.
1.48      yamt     1192:         * FPU IPIs can alter the LWP's saved cr0.  Dropping the priority
                   1193:         * is deferred until mi_switch(), when cpu_switchto() returns.
                   1194:         */
1.97      bouyer   1195: #ifdef XEN
                   1196:        pushl   %edi
                   1197:        call    _C_LABEL(i386_tls_switch)
                   1198:        addl    $4,%esp
                   1199: #else /* !XEN */
1.108     christos 1200:        movl    $IPL_HIGH,CPUVAR(ILEVEL)
                   1201:        movl    PCB_CR0(%ebx),%ecx              /* has CR0_TS clear */
1.48      yamt     1202:        movl    %cr0,%edx
1.1       fvdl     1203:
1.108     christos 1204:        /*
                   1205:         * If our floating point registers are on a different CPU,
                   1206:         * set CR0_TS so we'll trap rather than reuse bogus state.
                   1207:         */
                   1208:        cmpl    CPUVAR(FPCURLWP),%edi
1.113.2.3  skrll    1209:        je      skip_TS
1.108     christos 1210:        orl     $CR0_TS,%ecx
1.113.2.3  skrll    1211: skip_TS:
1.108     christos 1212:
1.48      yamt     1213:        /* Reloading CR0 is very expensive - avoid if possible. */
1.113.2.3  skrll    1214:        cmpl    %edx,%ecx
                   1215:        je      switch_return
1.1       fvdl     1216:        movl    %ecx,%cr0
1.97      bouyer   1217: #endif /* !XEN */
1.1       fvdl     1218:
1.113.2.3  skrll    1219: switch_return:
1.48      yamt     1220:        /* Return to the new LWP, returning 'oldlwp' in %eax. */
1.113.2.3  skrll    1221:        movl    %esi,%eax
1.1       fvdl     1222:        popl    %edi
                   1223:        popl    %esi
                   1224:        popl    %ebx
                   1225:        ret
1.20      dsl      1226:
1.60      yamt     1227: .Lcopy_iobitmap:
                   1228:        /* Copy I/O bitmap. */
1.86      ad       1229:        incl    _C_LABEL(pmap_iobmp_evcnt)+EV_COUNT
1.60      yamt     1230:        movl    $(IOMAPSIZE/4),%ecx
                   1231:        pushl   %esi
                   1232:        pushl   %edi
                   1233:        movl    %eax,%esi               /* pcb_iomap */
                   1234:        movl    CPUVAR(SELF),%edi
                   1235:        leal    CPU_INFO_IOMAP(%edi),%edi
                   1236:        rep
                   1237:        movsl
                   1238:        popl    %edi
                   1239:        popl    %esi
                   1240:        movl    $((CPU_INFO_IOMAP - CPU_INFO_TSS) << 16),CPUVAR(IOBASE)
                   1241:        jmp     .Liobitmap_done
1.72      yamt     1242: END(cpu_switchto)
1.60      yamt     1243:
1.1       fvdl     1244: /*
                   1245:  * void savectx(struct pcb *pcb);
1.48      yamt     1246:  *
1.1       fvdl     1247:  * Update pcb, saving current processor state.
                   1248:  */
                   1249: ENTRY(savectx)
1.113.2.2  skrll    1250:        movl    4(%esp),%edx            /* edx = pcb */
1.1       fvdl     1251:        movl    %esp,PCB_ESP(%edx)
                   1252:        movl    %ebp,PCB_EBP(%edx)
                   1253:        ret
1.72      yamt     1254: END(savectx)
1.1       fvdl     1255:
                   1256: /*
1.48      yamt     1257:  * osyscall()
                   1258:  *
1.1       fvdl     1259:  * Old call gate entry for syscall
                   1260:  */
                   1261: IDTVEC(osyscall)
1.87      ad       1262: #ifndef XEN
                   1263:        /* XXX we are in trouble! interrupts be off here. */
1.113.2.2  skrll    1264:        cli                     /* must be first instruction */
1.87      ad       1265: #endif
1.113.2.2  skrll    1266:        pushfl                  /* set eflags in trap frame */
1.1       fvdl     1267:        popl    8(%esp)
1.113.2.2  skrll    1268:        orl     $PSL_I,8(%esp)  /* re-enable ints on return to user */
                   1269:        pushl   $7              /* size of instruction for restart */
1.1       fvdl     1270:        jmp     syscall1
1.72      yamt     1271: IDTVEC_END(osyscall)
1.1       fvdl     1272:
                   1273: /*
1.48      yamt     1274:  * syscall()
                   1275:  *
1.1       fvdl     1276:  * Trap gate entry for syscall
                   1277:  */
                   1278: IDTVEC(syscall)
1.113.2.2  skrll    1279:        pushl   $2              /* size of instruction for restart */
1.1       fvdl     1280: syscall1:
1.113.2.2  skrll    1281:        pushl   $T_ASTFLT       /* trap # for doing ASTs */
1.1       fvdl     1282:        INTRENTRY
1.85      ad       1283:        STI(%eax)
1.1       fvdl     1284: #ifdef DIAGNOSTIC
                   1285:        movl    CPUVAR(ILEVEL),%ebx
                   1286:        testl   %ebx,%ebx
                   1287:        jz      1f
                   1288:        pushl   $5f
1.84      ad       1289:        call    _C_LABEL(panic)
1.1       fvdl     1290:        addl    $4,%esp
                   1291: #ifdef DDB
                   1292:        int     $3
                   1293: #endif
1.30      junyoung 1294: 1:
1.1       fvdl     1295: #endif /* DIAGNOSTIC */
1.113.2.2  skrll    1296:        addl    $1,CPUVAR(NSYSCALL)     /* count it atomically */
                   1297:        adcl    $0,CPUVAR(NSYSCALL)+4   /* count it atomically */
1.68      ad       1298:        movl    CPUVAR(CURLWP),%edi
                   1299:        movl    L_PROC(%edi),%edx
1.113.2.2  skrll    1300:        movl    %esp,L_MD_REGS(%edi)    /* save pointer to frame */
1.15      fvdl     1301:        pushl   %esp
1.113.2.2  skrll    1302:        call    *P_MD_SYSCALL(%edx)     /* get pointer to syscall() function */
1.15      fvdl     1303:        addl    $4,%esp
1.27      yamt     1304: .Lsyscall_checkast:
1.24      yamt     1305:        /* Check for ASTs on exit to user mode. */
1.62      bouyer   1306:        CLI(%eax)
1.68      ad       1307:        movl    L_MD_ASTPENDING(%edi), %eax
                   1308:        orl     CPUVAR(WANT_PMAPLOAD), %eax
1.24      yamt     1309:        jnz     9f
1.62      bouyer   1310: #ifdef XEN
                   1311:        STIC(%eax)
                   1312:        jz      14f
                   1313:        call    _C_LABEL(stipending)
                   1314:        testl   %eax,%eax
                   1315:        jz      14f
                   1316:        /* process pending interrupts */
                   1317:        CLI(%eax)
                   1318:        movl    CPUVAR(ILEVEL), %ebx
1.113.2.2  skrll    1319:        movl    $.Lsyscall_resume, %esi /* address to resume loop at */
1.62      bouyer   1320: .Lsyscall_resume:
1.113.2.2  skrll    1321:        movl    %ebx,%eax               /* get cpl */
1.62      bouyer   1322:        movl    CPUVAR(IUNMASK)(,%eax,4),%eax
1.113.2.2  skrll    1323:        andl    CPUVAR(IPENDING),%eax   /* any non-masked bits left? */
1.62      bouyer   1324:        jz      17f
                   1325:        bsrl    %eax,%eax
                   1326:        btrl    %eax,CPUVAR(IPENDING)
                   1327:        movl    CPUVAR(ISOURCES)(,%eax,4),%eax
                   1328:        jmp     *IS_RESUME(%eax)
1.113.2.2  skrll    1329: 17:    movl    %ebx, CPUVAR(ILEVEL)    /* restore cpl  */
1.62      bouyer   1330:        jmp     .Lsyscall_checkast
                   1331: 14:
                   1332: #endif /* XEN */
1.1       fvdl     1333: #ifndef DIAGNOSTIC
1.24      yamt     1334:        INTRFASTEXIT
1.1       fvdl     1335: #else /* DIAGNOSTIC */
1.24      yamt     1336:        cmpl    $IPL_NONE,CPUVAR(ILEVEL)
1.1       fvdl     1337:        jne     3f
                   1338:        INTRFASTEXIT
1.62      bouyer   1339: 3:     STI(%eax)
1.1       fvdl     1340:        pushl   $4f
1.84      ad       1341:        call    _C_LABEL(panic)
1.1       fvdl     1342:        addl    $4,%esp
1.58      ad       1343:        pushl   $IPL_NONE
                   1344:        call    _C_LABEL(spllower)
                   1345:        addl    $4,%esp
1.53      yamt     1346:        jmp     .Lsyscall_checkast
1.84      ad       1347: 4:     .asciz  "SPL NOT LOWERED ON SYSCALL EXIT\n"
                   1348: 5:     .asciz  "SPL NOT ZERO ON SYSCALL ENTRY\n"
1.1       fvdl     1349: #endif /* DIAGNOSTIC */
1.68      ad       1350: 9:
                   1351:        cmpl    $0, CPUVAR(WANT_PMAPLOAD)
                   1352:        jz      10f
                   1353:        STI(%eax)
1.24      yamt     1354:        call    _C_LABEL(pmap_load)
1.27      yamt     1355:        jmp     .Lsyscall_checkast      /* re-check ASTs */
1.68      ad       1356: 10:
                   1357:        /* Always returning to user mode here. */
                   1358:        movl    $0, L_MD_ASTPENDING(%edi)
                   1359:        STI(%eax)
                   1360:        /* Pushed T_ASTFLT into tf_trapno on entry. */
                   1361:        pushl   %esp
                   1362:        call    _C_LABEL(trap)
                   1363:        addl    $4,%esp
                   1364:        jmp     .Lsyscall_checkast      /* re-check ASTs */
1.72      yamt     1365: IDTVEC_END(syscall)
1.1       fvdl     1366:
1.81      ad       1367: IDTVEC(svr4_fasttrap)
1.113.2.2  skrll    1368:        pushl   $2              /* size of instruction for restart */
                   1369:        pushl   $T_ASTFLT       /* trap # for doing ASTs */
1.81      ad       1370:        INTRENTRY
1.85      ad       1371:        STI(%eax)
1.81      ad       1372:        pushl   $RW_READER
                   1373:        pushl   $_C_LABEL(svr4_fasttrap_lock)
                   1374:        call    _C_LABEL(rw_enter)
                   1375:        addl    $8,%esp
                   1376:        call    *_C_LABEL(svr4_fasttrap_vec)
                   1377:        pushl   $_C_LABEL(svr4_fasttrap_lock)
                   1378:        call    _C_LABEL(rw_exit)
                   1379:        addl    $4,%esp
                   1380: 2:     /* Check for ASTs on exit to user mode. */
                   1381:        cli
1.113.2.2  skrll    1382:        CHECK_ASTPENDING(%eax)
1.81      ad       1383:        je      1f
                   1384:        /* Always returning to user mode here. */
                   1385:        CLEAR_ASTPENDING(%eax)
                   1386:        sti
                   1387:        /* Pushed T_ASTFLT into tf_trapno on entry. */
                   1388:        pushl   %esp
                   1389:        call    _C_LABEL(trap)
                   1390:        addl    $4,%esp
                   1391:        jmp     2b
                   1392: 1:     CHECK_DEFERRED_SWITCH
                   1393:        jnz     9f
                   1394:        INTRFASTEXIT
                   1395: 9:     sti
                   1396:        call    _C_LABEL(pmap_load)
                   1397:        cli
                   1398:        jmp     2b
                   1399:
1.48      yamt     1400: /*
                   1401:  * int npx586bug1(int a, int b)
1.110     dsl      1402:  * Used when checking for the FDIV bug on first generations pentiums.
                   1403:  * Anything 120MHz or above is fine.
1.48      yamt     1404:  */
1.1       fvdl     1405: NENTRY(npx586bug1)
1.113.2.2  skrll    1406:        fildl   4(%esp)         /* x */
                   1407:        fildl   8(%esp)         /* y */
1.1       fvdl     1408:        fld     %st(1)
1.113.2.2  skrll    1409:        fdiv    %st(1),%st      /* x/y */
                   1410:        fmulp   %st,%st(1)      /* (x/y)*y */
                   1411:        fsubrp  %st,%st(1)      /* x-(x/y)*y */
1.1       fvdl     1412:        pushl   $0
                   1413:        fistpl  (%esp)
                   1414:        popl    %eax
                   1415:        ret
1.72      yamt     1416: END(npx586bug1)
1.50      ad       1417:
                   1418: /*
1.76      ad       1419:  * void sse2_idlezero_page(void *pg)
1.50      ad       1420:  *
1.76      ad       1421:  * Zero a page without polluting the cache.  Preemption must be
                   1422:  * disabled by the caller. Abort if a preemption is pending.
1.50      ad       1423:  */
1.76      ad       1424: ENTRY(sse2_idlezero_page)
1.50      ad       1425:        pushl   %ebp
                   1426:        movl    %esp,%ebp
                   1427:        movl    8(%esp), %edx
1.76      ad       1428:        movl    $(PAGE_SIZE/32), %ecx
1.50      ad       1429:        xorl    %eax, %eax
                   1430:        .align  16
                   1431: 1:
1.82      ad       1432:        testl   $RESCHED_KPREEMPT, CPUVAR(RESCHED)
1.76      ad       1433:        jnz     2f
1.50      ad       1434:        movnti  %eax, 0(%edx)
                   1435:        movnti  %eax, 4(%edx)
                   1436:        movnti  %eax, 8(%edx)
                   1437:        movnti  %eax, 12(%edx)
                   1438:        movnti  %eax, 16(%edx)
                   1439:        movnti  %eax, 20(%edx)
                   1440:        movnti  %eax, 24(%edx)
                   1441:        movnti  %eax, 28(%edx)
1.76      ad       1442:        addl    $32, %edx
1.75      ad       1443:        decl    %ecx
1.50      ad       1444:        jnz     1b
                   1445:        sfence
1.76      ad       1446:        incl    %eax
1.50      ad       1447:        pop     %ebp
                   1448:        ret
1.76      ad       1449: 2:
1.50      ad       1450:        sfence
                   1451:        popl    %ebp
                   1452:        ret
1.76      ad       1453: END(sse2_idlezero_page)

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