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: releng/11.0/sys/i386/i386/vm86bios.s 281495 2015-04-13 15:22:45Z kib $
   27  */
   28 
   29 #include "opt_npx.h"
   30 
   31 #include <machine/asmacros.h>           /* miscellaneous asm macros */
   32 #include <machine/trap.h>
   33 
   34 #include "assym.s"
   35 
   36 #define SCR_NEWPTD      PCB_ESI         /* readability macros */ 
   37 #define SCR_VMFRAME     PCB_EBP         /* see vm86.c for explanation */
   38 #define SCR_STACK       PCB_ESP
   39 #define SCR_PGTABLE     PCB_EBX
   40 #define SCR_ARGFRAME    PCB_EIP
   41 #define SCR_TSS0        PCB_VM86
   42 #define SCR_TSS1        (PCB_VM86+4)
   43 
   44         .data
   45         ALIGN_DATA
   46 
   47         .globl  vm86pcb
   48 
   49 vm86pcb:                .long   0
   50 
   51         .text
   52 
   53 /*
   54  * vm86_bioscall(struct trapframe_vm86 *vm86)
   55  */
   56 ENTRY(vm86_bioscall)
   57         movl    vm86pcb,%edx            /* scratch data area */
   58         movl    4(%esp),%eax
   59         movl    %eax,SCR_ARGFRAME(%edx) /* save argument pointer */
   60         pushl   %ebx
   61         pushl   %ebp
   62         pushl   %esi
   63         pushl   %edi
   64         pushl   %gs
   65 
   66 #ifdef DEV_NPX
   67         pushfl
   68         cli
   69         movl    PCPU(CURTHREAD),%ecx
   70         cmpl    %ecx,PCPU(FPCURTHREAD)  /* do we need to save fp? */
   71         jne     1f
   72         pushl   %edx
   73         movl    TD_PCB(%ecx),%ecx
   74         pushl   PCB_SAVEFPU(%ecx)
   75         call    npxsave
   76         addl    $4,%esp
   77         popl    %edx                    /* recover our pcb */
   78 1:
   79         popfl
   80 #endif
   81 
   82         movl    SCR_VMFRAME(%edx),%ebx  /* target frame location */
   83         movl    %ebx,%edi               /* destination */
   84         movl    SCR_ARGFRAME(%edx),%esi /* source (set on entry) */
   85         movl    $VM86_FRAMESIZE/4,%ecx  /* sizeof(struct vm86frame)/4 */
   86         cld
   87         rep
   88         movsl                           /* copy frame to new stack */
   89 
   90         movl    PCPU(CURPCB),%eax
   91         pushl   %eax                    /* save curpcb */
   92         movl    %edx,PCPU(CURPCB)       /* set curpcb to vm86pcb */
   93 
   94         movl    PCPU(TSS_GDT),%ebx      /* entry in GDT */
   95         movl    0(%ebx),%eax
   96         movl    %eax,SCR_TSS0(%edx)     /* save first word */
   97         movl    4(%ebx),%eax
   98         andl    $~0x200, %eax           /* flip 386BSY -> 386TSS */
   99         movl    %eax,SCR_TSS1(%edx)     /* save second word */
  100 
  101         movl    PCB_EXT(%edx),%edi      /* vm86 tssd entry */
  102         movl    0(%edi),%eax
  103         movl    %eax,0(%ebx)
  104         movl    4(%edi),%eax
  105         movl    %eax,4(%ebx)
  106         movl    $GPROC0_SEL*8,%esi      /* GSEL(entry, SEL_KPL) */
  107         ltr     %si
  108 
  109         movl    %cr3,%eax
  110         pushl   %eax                    /* save address space */
  111         movl    IdlePTD,%ecx
  112         movl    %ecx,%ebx
  113         addl    $KERNBASE,%ebx          /* va of Idle PTD */
  114         movl    0(%ebx),%eax
  115         pushl   %eax                    /* old ptde != 0 when booting */
  116         pushl   %ebx                    /* keep for reuse */
  117 
  118         movl    %esp,SCR_STACK(%edx)    /* save current stack location */
  119 
  120         movl    SCR_NEWPTD(%edx),%eax   /* mapping for vm86 page table */
  121         movl    %eax,0(%ebx)            /* ... install as PTD entry 0 */
  122 
  123 #if defined(PAE) || defined(PAE_TABLES)
  124         movl    IdlePDPT,%ecx
  125 #endif
  126         movl    %ecx,%cr3               /* new page tables */
  127         movl    SCR_VMFRAME(%edx),%esp  /* switch to new stack */
  128 
  129         pushl   %esp
  130         call    vm86_prepcall           /* finish setup */
  131         add     $4, %esp
  132         
  133         /*
  134          * Return via doreti
  135          */
  136         MEXITCOUNT
  137         jmp     doreti
  138 
  139 
  140 /*
  141  * vm86_biosret(struct trapframe_vm86 *vm86)
  142  */
  143 ENTRY(vm86_biosret)
  144         movl    vm86pcb,%edx            /* data area */
  145 
  146         movl    4(%esp),%esi            /* source */
  147         movl    SCR_ARGFRAME(%edx),%edi /* destination */
  148         movl    $VM86_FRAMESIZE/4,%ecx  /* size */
  149         cld
  150         rep
  151         movsl                           /* copy frame to original frame */
  152 
  153         movl    SCR_STACK(%edx),%esp    /* back to old stack */
  154         popl    %ebx                    /* saved va of Idle PTD */
  155         popl    %eax
  156         movl    %eax,0(%ebx)            /* restore old pte */
  157         popl    %eax
  158         movl    %eax,%cr3               /* install old page table */
  159 
  160         movl    PCPU(TSS_GDT),%ebx              /* entry in GDT */
  161         movl    SCR_TSS0(%edx),%eax
  162         movl    %eax,0(%ebx)            /* restore first word */
  163         movl    SCR_TSS1(%edx),%eax
  164         movl    %eax,4(%ebx)            /* restore second word */
  165         movl    $GPROC0_SEL*8,%esi      /* GSEL(entry, SEL_KPL) */
  166         ltr     %si
  167         
  168         popl    PCPU(CURPCB)            /* restore curpcb/curproc */
  169         movl    SCR_ARGFRAME(%edx),%edx /* original stack frame */
  170         movl    TF_TRAPNO(%edx),%eax    /* return (trapno) */
  171 
  172         popl    %gs
  173         popl    %edi
  174         popl    %esi
  175         popl    %ebp
  176         popl    %ebx
  177         ret                             /* back to our normal program */

Cache object: 1a51938fc21076768d220cda3f5d0561


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