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
Version:
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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.inc" 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_VM86 40 #define SCR_TSS1 (PCB_VM86+4) 41 42 .data 43 ALIGN_DATA 44 45 .globl vm86pcb 46 47 vm86pcb: .long 0 48 49 .text 50 51 /* 52 * vm86_bioscall(struct trapframe_vm86 *vm86) 53 */ 54 ENTRY(vm86_bioscall) 55 movl vm86pcb,%edx /* scratch data area */ 56 movl 4(%esp),%eax 57 movl %eax,SCR_ARGFRAME(%edx) /* save argument pointer */ 58 pushl %ebx 59 pushl %ebp 60 pushl %esi 61 pushl %edi 62 pushl %gs 63 64 movl PCPU(CURTHREAD),%ecx 65 cmpl %ecx,PCPU(FPCURTHREAD) /* do we need to save fp? */ 66 jne 1f 67 pushl %edx 68 movl TD_PCB(%ecx),%ecx 69 pushl PCB_SAVEFPU(%ecx) 70 movl $npxsave,%eax 71 call *%eax 72 addl $4,%esp 73 popl %edx /* recover our pcb */ 74 1: 75 movl SCR_VMFRAME(%edx),%ebx /* target frame location */ 76 movl %ebx,%edi /* destination */ 77 movl SCR_ARGFRAME(%edx),%esi /* source (set on entry) */ 78 movl $VM86_FRAMESIZE/4,%ecx /* sizeof(struct vm86frame)/4 */ 79 cld 80 rep 81 movsl /* copy frame to new stack */ 82 83 movl PCPU(CURPCB),%eax 84 pushl %eax /* save curpcb */ 85 movl %edx,PCPU(CURPCB) /* set curpcb to vm86pcb */ 86 87 movl PCPU(TSS_GDT),%ebx /* entry in GDT */ 88 movl 0(%ebx),%eax 89 movl %eax,SCR_TSS0(%edx) /* save first word */ 90 movl 4(%ebx),%eax 91 andl $~0x200, %eax /* flip 386BSY -> 386TSS */ 92 movl %eax,SCR_TSS1(%edx) /* save second word */ 93 94 movl PCB_EXT(%edx),%edi /* vm86 tssd entry */ 95 movl 0(%edi),%eax 96 movl %eax,0(%ebx) 97 movl 4(%edi),%eax 98 movl %eax,4(%ebx) 99 movl $GPROC0_SEL*8,%esi /* GSEL(entry, SEL_KPL) */ 100 ltr %si 101 102 movl %cr3,%eax 103 pushl %eax /* save address space */ 104 movl IdlePTD,%ecx /* va (and pa) of Idle PTD */ 105 movl %ecx,%ebx 106 movl 0(%ebx),%eax 107 pushl %eax /* old ptde != 0 when booting */ 108 pushl %ebx /* keep for reuse */ 109 110 movl %esp,SCR_STACK(%edx) /* save current stack location */ 111 112 movl SCR_NEWPTD(%edx),%eax /* mapping for vm86 page table */ 113 movl %eax,0(%ebx) /* ... install as PTD entry 0 */ 114 115 #if defined(PAE) || defined(PAE_TABLES) 116 movl IdlePDPT,%ecx 117 #endif 118 movl %ecx,%cr3 /* new page tables */ 119 movl SCR_VMFRAME(%edx),%esp /* switch to new stack */ 120 121 pushl %esp 122 movl $vm86_prepcall, %eax 123 call *%eax /* finish setup */ 124 add $4, %esp 125 126 /* 127 * Return via doreti 128 */ 129 MEXITCOUNT 130 jmp doreti 131 132 133 /* 134 * vm86_biosret(struct trapframe_vm86 *vm86) 135 */ 136 ENTRY(vm86_biosret) 137 movl vm86pcb,%edx /* data area */ 138 139 movl 4(%esp),%esi /* source */ 140 movl SCR_ARGFRAME(%edx),%edi /* destination */ 141 movl $VM86_FRAMESIZE/4,%ecx /* size */ 142 cld 143 rep 144 movsl /* copy frame to original frame */ 145 146 movl SCR_STACK(%edx),%esp /* back to old stack */ 147 popl %ebx /* saved va of Idle PTD */ 148 popl %eax 149 movl %eax,0(%ebx) /* restore old pte */ 150 popl %eax 151 movl %eax,%cr3 /* install old page table */ 152 153 movl PCPU(TSS_GDT),%ebx /* entry in GDT */ 154 movl SCR_TSS0(%edx),%eax 155 movl %eax,0(%ebx) /* restore first word */ 156 movl SCR_TSS1(%edx),%eax 157 movl %eax,4(%ebx) /* restore second word */ 158 movl $GPROC0_SEL*8,%esi /* GSEL(entry, SEL_KPL) */ 159 ltr %si 160 161 popl PCPU(CURPCB) /* restore curpcb/curproc */ 162 movl SCR_ARGFRAME(%edx),%edx /* original stack frame */ 163 movl TF_TRAPNO(%edx),%eax /* return (trapno) */ 164 165 popl %gs 166 popl %edi 167 popl %esi 168 popl %ebp 169 popl %ebx 170 ret /* back to our normal program */
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