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 "opt_vm86.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_FS 42 #define SCR_TSS1 PCB_GS 43 44 .data 45 ALIGN_DATA 46 47 .globl _in_vm86call, _vm86pcb 48 49 _in_vm86call: .long 0 50 _vm86pcb: .long 0 51 52 .text 53 54 /* 55 * vm86_bioscall(struct trapframe_vm86 *vm86) 56 */ 57 ENTRY(vm86_bioscall) 58 movl _vm86pcb,%edx /* scratch data area */ 59 movl 4(%esp),%eax 60 movl %eax,SCR_ARGFRAME(%edx) /* save argument pointer */ 61 pushl %ebx 62 pushl %ebp 63 pushl %esi 64 pushl %edi 65 pushl %fs 66 pushl %gs 67 68 #ifdef SMP 69 pushl %edx 70 ALIGN_LOCK /* Get global lock */ 71 popl %edx 72 #endif 73 74 #if NNPX > 0 75 movl _curproc,%ecx 76 cmpl %ecx,_npxproc /* do we need to save fp? */ 77 jne 1f 78 testl %ecx,%ecx 79 je 1f /* no curproc/npxproc */ 80 pushl %edx 81 movl P_ADDR(%ecx),%ecx 82 addl $PCB_SAVEFPU,%ecx 83 pushl %ecx 84 call _npxsave 85 popl %ecx 86 popl %edx /* recover our pcb */ 87 #endif 88 89 1: 90 movl SCR_VMFRAME(%edx),%ebx /* target frame location */ 91 movl %ebx,%edi /* destination */ 92 movl SCR_ARGFRAME(%edx),%esi /* source (set on entry) */ 93 movl $21,%ecx /* sizeof(struct vm86frame)/4 */ 94 cld 95 rep 96 movsl /* copy frame to new stack */ 97 98 movl _curpcb,%eax 99 pushl %eax /* save curpcb */ 100 movl %edx,_curpcb /* set curpcb to vm86pcb */ 101 102 movl _my_tr,%esi 103 leal _gdt(,%esi,8),%ebx /* entry in GDT */ 104 movl 0(%ebx),%eax 105 movl %eax,SCR_TSS0(%edx) /* save first word */ 106 movl 4(%ebx),%eax 107 andl $~0x200, %eax /* flip 386BSY -> 386TSS */ 108 movl %eax,SCR_TSS1(%edx) /* save second word */ 109 110 movl PCB_EXT(%edx),%edi /* vm86 tssd entry */ 111 movl 0(%edi),%eax 112 movl %eax,0(%ebx) 113 movl 4(%edi),%eax 114 movl %eax,4(%ebx) 115 shll $3,%esi /* GSEL(entry, SEL_KPL) */ 116 ltr %si 117 118 movl %cr3,%eax 119 pushl %eax /* save address space */ 120 #ifdef SMP 121 movl _cpuid, %ecx 122 movl CNAME(IdlePTDS)(,%ecx,4), %ebx 123 movl _my_idlePTD,%ecx 124 #else 125 movl _IdlePTD,%ecx 126 movl %ecx,%ebx 127 addl $KERNBASE,%ebx /* va of Idle PTD */ 128 #endif 129 movl 0(%ebx),%eax 130 pushl %eax /* old ptde != 0 when booting */ 131 pushl %ebx /* keep for reuse */ 132 133 movl %esp,SCR_STACK(%edx) /* save current stack location */ 134 135 movl SCR_NEWPTD(%edx),%eax /* mapping for vm86 page table */ 136 movl %eax,0(%ebx) /* ... install as PTD entry 0 */ 137 138 movl %ecx,%cr3 /* new page tables */ 139 movl SCR_VMFRAME(%edx),%esp /* switch to new stack */ 140 141 call _vm86_prepcall /* finish setup */ 142 143 movl $1,_in_vm86call /* set flag for trap() */ 144 145 /* 146 * Return via _doreti 147 */ 148 #ifdef SMP 149 ECPL_LOCK 150 #ifdef CPL_AND_CML 151 #error Not ready for CPL_AND_CML 152 #endif 153 pushl _cpl /* cpl to restore */ 154 ECPL_UNLOCK 155 #else 156 pushl _cpl /* cpl to restore */ 157 #endif 158 subl $4,%esp /* dummy unit */ 159 MPLOCKED incb _intr_nesting_level 160 MEXITCOUNT 161 jmp _doreti 162 163 164 /* 165 * vm86_biosret(struct trapframe_vm86 *vm86) 166 */ 167 ENTRY(vm86_biosret) 168 movl _vm86pcb,%edx /* data area */ 169 170 movl 4(%esp),%esi /* source */ 171 movl SCR_ARGFRAME(%edx),%edi /* destination */ 172 movl $21,%ecx /* size */ 173 cld 174 rep 175 movsl /* copy frame to original frame */ 176 177 movl SCR_STACK(%edx),%esp /* back to old stack */ 178 popl %ebx /* saved va of Idle PTD */ 179 popl %eax 180 movl %eax,0(%ebx) /* restore old pte */ 181 popl %eax 182 movl %eax,%cr3 /* install old page table */ 183 184 movl $0,_in_vm86call /* reset trapflag */ 185 186 movl _my_tr,%esi 187 leal _gdt(,%esi,8),%ebx /* entry in GDT */ 188 movl SCR_TSS0(%edx),%eax 189 movl %eax,0(%ebx) /* restore first word */ 190 movl SCR_TSS1(%edx),%eax 191 movl %eax,4(%ebx) /* restore second word */ 192 shll $3,%esi /* GSEL(entry, SEL_KPL) */ 193 ltr %si 194 195 popl _curpcb /* restore curpcb/curproc */ 196 movl SCR_ARGFRAME(%edx),%edx /* original stack frame */ 197 movl TF_TRAPNO(%edx),%eax /* return (trapno) */ 198 199 popl %gs 200 popl %fs 201 popl %edi 202 popl %esi 203 popl %ebp 204 popl %ebx 205 ret /* back to our normal program */
Cache object: 4cb876bd052550447566e1bf4af48f76
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