Annotation of sys/arch/i386/i386/kvm86call.S, Revision 1.1
1.1 ! nbrk 1: /* $OpenBSD: kvm86call.S,v 1.4 2006/12/11 23:45:13 gwk Exp $ */
! 2: /* $NetBSD: kvm86call.S,v 1.7 2006/04/11 17:14:07 drochner Exp $ */
! 3:
! 4: /*-
! 5: * Copyright (c) 1998 Jonathan Lemon
! 6: * All rights reserved.
! 7: * Copyright (c) 2002
! 8: * Matthias Drochner. All rights reserved.
! 9: *
! 10: * Redistribution and use in source and binary forms, with or without
! 11: * modification, are permitted provided that the following conditions
! 12: * are met:
! 13: * 1. Redistributions of source code must retain the above copyright
! 14: * notice, this list of conditions and the following disclaimer.
! 15: * 2. Redistributions in binary form must reproduce the above copyright
! 16: * notice, this list of conditions and the following disclaimer in the
! 17: * documentation and/or other materials provided with the distribution.
! 18: *
! 19: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
! 20: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
! 21: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
! 22: * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
! 23: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
! 24: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
! 25: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
! 26: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
! 27: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
! 28: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
! 29: * SUCH DAMAGE.
! 30: *
! 31: * $FreeBSD: src/sys/i386/i386/vm86bios.s,v 1.28 2001/12/11 23:33:40 jhb Exp $
! 32: */
! 33:
! 34: #include <machine/asm.h>
! 35: #include <machine/param.h>
! 36: #include "assym.h"
! 37:
! 38: .data
! 39: .align 4
! 40:
! 41: /* flag for trap() */
! 42: .globl kvm86_incall
! 43: kvm86_incall: .long 0
! 44:
! 45: /* XXX arguments for kvm86call() */
! 46: .globl vm86pcb, vm86newptd, vm86frame, vm86pgtableva
! 47: .globl vm86tssd0, vm86tssd1
! 48:
! 49: /* locals */
! 50: SCRARGFRAME: .long 0
! 51: SCRSTACK: .long 0
! 52: SCRTSS0: .long 0
! 53: SCRTSS1: .long 0
! 54:
! 55: .text
! 56:
! 57: #if defined MULTIPROCESSOR
! 58: #include <machine/i82489reg.h>
! 59: #endif
! 60:
! 61: /* int kvm86_call(struct trapframe *) */
! 62: ENTRY(kvm86_call)
! 63: pushl %ebp
! 64: movl %esp,%ebp /* set up frame ptr */
! 65: pushl %esi
! 66: pushl %edi
! 67: pushl %ebx
! 68: pushl %fs
! 69: pushl %gs
! 70:
! 71: movl 8(%ebp),%eax
! 72: movl %eax,SCRARGFRAME /* save argument pointer */
! 73:
! 74: movl vm86frame,%edi /* target frame location */
! 75: movl SCRARGFRAME,%esi /* source (set on entry) */
! 76: movl $FRAMESIZE/4,%ecx /* sizeof(struct trapframe)/4 */
! 77: cld
! 78: rep
! 79: movsl /* copy frame to new stack */
! 80:
! 81: #ifdef MULTIPROCESSOR
! 82: movl _C_LABEL(local_apic)+LAPIC_ID,%ecx
! 83: shrl $LAPIC_ID_SHIFT,%ecx
! 84: leal 0(,%ecx,4),%ecx
! 85: movl _C_LABEL(cpu_info)(%ecx),%edx
! 86: movl %edx,%ecx
! 87: #else
! 88: leal _C_LABEL(cpu_info_primary),%ecx
! 89: #endif
! 90:
! 91: movl CPU_INFO_CURPCB(%ecx),%eax
! 92: pushl %eax /* save curpcb */
! 93:
! 94: movl vm86pcb,%eax
! 95: movl %eax,CPU_INFO_CURPCB(%ecx) /* set curpcb to vm86pcb */
! 96: movl CPU_INFO_CURPROC(%ecx),%ecx
! 97: movl P_MD_TSS_SEL(%ecx),%edi
! 98:
! 99: #ifdef MULTIPROCESSOR
! 100: movl CPU_INFO_GDT(%edx),%eax
! 101: #else
! 102: movl _C_LABEL(gdt),%eax
! 103: #endif
! 104: andl $~0x0200,4(%eax,%edi,1) /* reset "task busy" */
! 105:
! 106: movl 0(%eax,%edi,1),%edx
! 107: movl %edx,SCRTSS0 /* save first word */
! 108: movl 4(%eax,%edi,1),%edx
! 109: movl %edx,SCRTSS1 /* save second word */
! 110:
! 111: movl vm86tssd0,%edx /* vm86 tssd entry */
! 112: movl %edx,0(%eax,%edi,1)
! 113: movl vm86tssd1,%edx /* vm86 tssd entry */
! 114: movl %edx,4(%eax,%edi,1)
! 115: ltr %di
! 116:
! 117: movl %cr3,%eax
! 118: pushl %eax /* save address space */
! 119: movl PTDpaddr,%ecx
! 120: movl %ecx,%ebx
! 121: addl $KERNBASE,%ebx /* va of Idle PDP */
! 122: movl 0(%ebx),%eax
! 123: pushl %eax /* old pde */
! 124: pushl %ebx /* keep address for reuse */
! 125:
! 126: movl %esp,SCRSTACK /* save current stack location */
! 127:
! 128: movl vm86newptd,%eax /* mapping for vm86 page table */
! 129: movl %eax,0(%ebx) /* ... install as PDP entry 0 */
! 130:
! 131: movl %ecx,%cr3 /* new page tables */
! 132: movl vm86frame,%esp /* switch to new stack */
! 133:
! 134: movl $1,kvm86_incall /* set flag for trap() */
! 135:
! 136: /* INTRFASTEXIT */
! 137: popl %gs
! 138: popl %fs
! 139: popl %es
! 140: popl %ds
! 141: popl %edi
! 142: popl %esi
! 143: popl %ebp
! 144: popl %ebx
! 145: popl %edx
! 146: popl %ecx
! 147: popl %eax
! 148: addl $8,%esp
! 149: iret
! 150:
! 151:
! 152: /* void kvm86_ret(struct trapframe *, int) */
! 153: ENTRY(kvm86_ret)
! 154: pushl %ebp
! 155: movl %esp,%ebp /* set up frame ptr */
! 156:
! 157: movl 8(%ebp),%esi /* source */
! 158: movl SCRARGFRAME,%edi /* destination */
! 159: movl $FRAMESIZE/4,%ecx /* size */
! 160: cld
! 161: rep
! 162: movsl /* copy frame to original frame */
! 163:
! 164: movl SCRSTACK,%esp /* back to old stack */
! 165: popl %ebx /* saved va of Idle PDP */
! 166: popl %eax
! 167: movl %eax,0(%ebx) /* restore old pde */
! 168: popl %eax
! 169: movl %eax,%cr3 /* install old page table */
! 170:
! 171: movl $0,kvm86_incall /* reset trapflag */
! 172:
! 173:
! 174: #ifdef MULTIPROCESSOR
! 175: movl _C_LABEL(local_apic)+LAPIC_ID,%ecx
! 176: shrl $LAPIC_ID_SHIFT,%ecx
! 177: leal 0(,%ecx,4),%ecx
! 178: movl _C_LABEL(cpu_info)(%ecx),%ecx
! 179: movl CPU_INFO_GDT(%ecx),%eax
! 180: #else
! 181: leal _C_LABEL(cpu_info_primary),%ecx
! 182: movl _C_LABEL(gdt),%eax
! 183: #endif
! 184: movl CPU_INFO_CURPROC(%ecx),%ecx
! 185: movl P_MD_TSS_SEL(%ecx),%edi
! 186: movl SCRTSS0, %edx
! 187: movl %edx, 0(%eax,%edi,1) /* restore first word */
! 188: movl SCRTSS1, %edx
! 189: movl %edx, 4(%eax,%edi,1) /* restore second word */
! 190: ltr %di
! 191:
! 192:
! 193: #ifdef MULTIPROCESSOR
! 194: movl _C_LABEL(local_apic)+LAPIC_ID,%ecx
! 195: shrl $LAPIC_ID_SHIFT,%ecx
! 196: leal 0(,%ecx,4),%ecx
! 197: movl _C_LABEL(cpu_info)(%ecx),%ecx
! 198: #else
! 199: leal _C_LABEL(cpu_info_primary),%ecx
! 200: #endif
! 201: popl %eax /* restore curpcb */
! 202: movl %eax,CPU_INFO_CURPCB(%ecx)
! 203:
! 204: movl 12(%ebp), %eax /* will be kvm86_call()'s retval */
! 205:
! 206: popl %gs
! 207: popl %fs
! 208: popl %ebx
! 209: popl %edi
! 210: popl %esi
! 211: popl %ebp
! 212: ret /* back to kvm86_call()'s caller */
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