The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/i386/i386/vm86bios.s

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    1 /*-
    2  * Copyright (c) 1998 Jonathan Lemon
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  *
   14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   24  * SUCH DAMAGE.
   25  *
   26  * $FreeBSD$
   27  */
   28 
   29 #include <machine/asmacros.h>           /* miscellaneous asm macros */
   30 #include <machine/trap.h>
   31 
   32 #include "assym.s"
   33 
   34 #define SCR_NEWPTD      PCB_ESI         /* readability macros */ 
   35 #define SCR_VMFRAME     PCB_EBP         /* see vm86.c for explanation */
   36 #define SCR_STACK       PCB_ESP
   37 #define SCR_PGTABLE     PCB_EBX
   38 #define SCR_ARGFRAME    PCB_EIP
   39 #define SCR_TSS0        PCB_SPARE
   40 #define SCR_TSS1        (PCB_SPARE+4)
   41 
   42         .data
   43         ALIGN_DATA
   44 
   45         .globl  _in_vm86call, _vm86pcb
   46 
   47 _in_vm86call:           .long   0
   48 _vm86pcb:               .long   0
   49 
   50         .text
   51 
   52 /*
   53  * vm86_bioscall(struct trapframe_vm86 *vm86)
   54  */
   55 ENTRY(vm86_bioscall)
   56         movl    _vm86pcb,%edx           /* scratch data area */
   57         movl    4(%esp),%eax
   58         movl    %eax,SCR_ARGFRAME(%edx) /* save argument pointer */
   59         pushl   %ebx
   60         pushl   %ebp
   61         pushl   %esi
   62         pushl   %edi
   63         pushl   %gs
   64 
   65 #ifdef SMP      
   66         pushl   %edx
   67         MP_LOCK                         /* Get global lock */
   68         popl    %edx
   69 #endif
   70 
   71 #if NNPX > 0
   72         movl    _curproc,%ecx
   73         cmpl    %ecx,_npxproc           /* do we need to save fp? */
   74         jne     1f
   75         testl   %ecx,%ecx
   76         je      1f                      /* no curproc/npxproc */
   77         pushl   %edx
   78         movl    P_ADDR(%ecx),%ecx
   79         addl    $PCB_SAVEFPU,%ecx
   80         pushl   %ecx
   81         call    _npxsave
   82         popl    %ecx
   83         popl    %edx                    /* recover our pcb */
   84 #endif
   85 
   86 1:
   87         movl    SCR_VMFRAME(%edx),%ebx  /* target frame location */
   88         movl    %ebx,%edi               /* destination */
   89         movl    SCR_ARGFRAME(%edx),%esi /* source (set on entry) */
   90         movl    $VM86_FRAMESIZE/4,%ecx  /* sizeof(struct vm86frame)/4 */
   91         cld
   92         rep
   93         movsl                           /* copy frame to new stack */
   94 
   95         movl    _curpcb,%eax
   96         pushl   %eax                    /* save curpcb */
   97         movl    %edx,_curpcb            /* set curpcb to vm86pcb */
   98 
   99         movl    _tss_gdt,%ebx           /* entry in GDT */
  100         movl    0(%ebx),%eax
  101         movl    %eax,SCR_TSS0(%edx)     /* save first word */
  102         movl    4(%ebx),%eax
  103         andl    $~0x200, %eax           /* flip 386BSY -> 386TSS */
  104         movl    %eax,SCR_TSS1(%edx)     /* save second word */
  105 
  106         movl    PCB_EXT(%edx),%edi      /* vm86 tssd entry */
  107         movl    0(%edi),%eax
  108         movl    %eax,0(%ebx)
  109         movl    4(%edi),%eax
  110         movl    %eax,4(%ebx)
  111         movl    $GPROC0_SEL*8,%esi      /* GSEL(entry, SEL_KPL) */
  112         ltr     %si
  113 
  114         movl    %cr3,%eax
  115         pushl   %eax                    /* save address space */
  116         movl    _IdlePTD,%ecx
  117         movl    %ecx,%ebx
  118         addl    $KERNBASE,%ebx          /* va of Idle PTD */
  119         movl    0(%ebx),%eax
  120         pushl   %eax                    /* old ptde != 0 when booting */
  121         pushl   %ebx                    /* keep for reuse */
  122 
  123         movl    %esp,SCR_STACK(%edx)    /* save current stack location */
  124 
  125         movl    SCR_NEWPTD(%edx),%eax   /* mapping for vm86 page table */
  126         movl    %eax,0(%ebx)            /* ... install as PTD entry 0 */
  127 
  128 #ifdef PAE
  129         movl    $_IdlePDPT-KERNBASE,%ecx
  130 #endif
  131         movl    %ecx,%cr3               /* new page tables */
  132         movl    SCR_VMFRAME(%edx),%esp  /* switch to new stack */
  133         
  134         call    _vm86_prepcall          /* finish setup */
  135 
  136         movl    $1,_in_vm86call         /* set flag for trap() */
  137 
  138         /*
  139          * Return via _doreti
  140          */
  141 #ifdef SMP
  142         pushl   _cpl                    /* cpl to restore */
  143 #else
  144         pushl   _cpl                    /* cpl to restore */
  145 #endif
  146         subl    $4,%esp                 /* dummy unit */
  147         incb    _intr_nesting_level
  148         MEXITCOUNT
  149         jmp     _doreti
  150 
  151 
  152 /*
  153  * vm86_biosret(struct trapframe_vm86 *vm86)
  154  */
  155 ENTRY(vm86_biosret)
  156         movl    _vm86pcb,%edx           /* data area */
  157 
  158         movl    4(%esp),%esi            /* source */
  159         movl    SCR_ARGFRAME(%edx),%edi /* destination */
  160         movl    $VM86_FRAMESIZE/4,%ecx  /* size */
  161         cld
  162         rep
  163         movsl                           /* copy frame to original frame */
  164 
  165         movl    SCR_STACK(%edx),%esp    /* back to old stack */
  166         popl    %ebx                    /* saved va of Idle PTD */
  167         popl    %eax
  168         movl    %eax,0(%ebx)            /* restore old pte */
  169         popl    %eax
  170         movl    %eax,%cr3               /* install old page table */
  171 
  172         movl    $0,_in_vm86call         /* reset trapflag */
  173 
  174         movl    _tss_gdt,%ebx           /* entry in GDT */
  175         movl    SCR_TSS0(%edx),%eax
  176         movl    %eax,0(%ebx)            /* restore first word */
  177         movl    SCR_TSS1(%edx),%eax
  178         movl    %eax,4(%ebx)            /* restore second word */
  179         movl    $GPROC0_SEL*8,%esi      /* GSEL(entry, SEL_KPL) */
  180         ltr     %si
  181         
  182         popl    _curpcb                 /* restore curpcb/curproc */
  183         movl    SCR_ARGFRAME(%edx),%edx /* original stack frame */
  184         movl    TF_TRAPNO(%edx),%eax    /* return (trapno) */
  185 
  186         popl    %gs
  187         popl    %edi
  188         popl    %esi
  189         popl    %ebp
  190         popl    %ebx
  191         ret                             /* back to our normal program */

Cache object: 9862b12cee4f90ade4a7080f7009f776


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