Return to PCresume.c CVS log

Up to [Apple Darwin 0.x] / kernel / machdep / i386 / pc_support

Annotation of kernel/machdep/i386/pc_support/PCresume.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
        !             3:  *
        !             4:  * @APPLE_LICENSE_HEADER_START@
        !             5:  * 
        !             6:  * Portions Copyright (c) 1999 Apple Computer, Inc.  All Rights
        !             7:  * Reserved.  This file contains Original Code and/or Modifications of
        !             8:  * Original Code as defined in and that are subject to the Apple Public
        !             9:  * Source License Version 1.1 (the "License").  You may not use this file
        !            10:  * except in compliance with the License.  Please obtain a copy of the
        !            11:  * License at http://www.apple.com/publicsource and read it before using
        !            12:  * this file.
        !            13:  * 
        !            14:  * The Original Code and all software distributed under the License are
        !            15:  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
        !            16:  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
        !            17:  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
        !            18:  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
        !            19:  * License for the specific language governing rights and limitations
        !            20:  * under the License.
        !            21:  * 
        !            22:  * @APPLE_LICENSE_HEADER_END@
        !            23:  */
        !            24: 
        !            25: /*
        !            26:  * Copyright (c) 1993 NeXT Computer, Inc.
        !            27:  *
        !            28:  * PC support primatives.
        !            29:  *
        !            30:  * HISTORY
        !            31:  *
        !            32:  * 22 Mar 1993 ? at NeXT
        !            33:  *     Created.
        !            34:  */
        !            35: 
        !            36: #import <mach/mach_types.h>
        !            37: 
        !            38: #import <machdep/i386/sel_inline.h>
        !            39: #import <machdep/i386/cpu_inline.h>
        !            40: 
        !            41: #import "PCprivate.h"
        !            42: 
        !            43: kern_return_t
        !            44: PCresume(void)
        !            45: {
        !            46:     thread_t                   thread = current_thread();
        !            47:     thread_saved_state_t       *saved_state = USER_REGS(thread);
        !            48:     PCshared_t                 shared = threadPCShared(thread);
        !            49:     PCcontext_t                        context;
        !            50:     _PCcpuState_t *            cpuState;
        !            51:     
        !            52:     if (shared == 0)
        !            53:        return (KERN_FAILURE);
        !            54:        
        !            55:     cpuState = &shared->cpuState;
        !            56:     
        !            57:     if (cpuState->cr0.pe && cpuState->cs.ti != SEL_LDT)
        !            58:        return (KERN_FAILURE);
        !            59:        
        !            60:     context = currentContext(shared);
        !            61:        
        !            62:     context->IF_flag = (cpuState->eflags & EFL_IF) != 0;
        !            63:     context->EM_bit = cpuState->cr0.em;
        !            64:     context->X_flags = (cpuState->eflags & (EFL_NT | EFL_IOPL));
        !            65:        
        !            66:     PCscheduleTimers(context);
        !            67:        
        !            68:     context->running = TRUE;
        !            69:     
        !            70:     setts();
        !            71:        
        !            72:     saved_state->regs.eax = cpuState->eax;
        !            73:     saved_state->regs.ebx = cpuState->ebx;
        !            74:     saved_state->regs.ecx = cpuState->ecx;
        !            75:     saved_state->regs.edx = cpuState->edx;
        !            76:     saved_state->regs.edi = cpuState->edi;
        !            77:     saved_state->regs.esi = cpuState->esi;
        !            78:     saved_state->regs.ebp = cpuState->ebp;
        !            79:     saved_state->frame.esp = cpuState->esp;
        !            80:     saved_state->frame.ss = cpuState->ss;
        !            81:     saved_state->frame.eflags = cpuState->eflags;
        !            82:     saved_state->frame.eflags &= ~( EFL_VM | EFL_NT | EFL_IOPL | EFL_CLR );
        !            83:     saved_state->frame.eflags |=  ( EFL_IF | EFL_SET );
        !            84:     saved_state->frame.eip = cpuState->eip;
        !            85:     saved_state->frame.cs = cpuState->cs;
        !            86:     
        !            87:     if (cpuState->cr0.pe) {
        !            88:        saved_state->regs.ds = cpuState->ds;
        !            89:        saved_state->regs.es = cpuState->es;
        !            90:        saved_state->regs.fs = cpuState->fs;
        !            91:        saved_state->regs.gs = cpuState->gs;
        !            92:     }
        !            93:     else {    
        !            94:        saved_state->frame.eflags |= EFL_VM;
        !            95:     
        !            96:        saved_state->regs.ds = NULL_SEL;
        !            97:        saved_state->regs.es = NULL_SEL;
        !            98:        saved_state->regs.fs = NULL_SEL;
        !            99:        saved_state->regs.gs = NULL_SEL;
        !           100:        saved_state->frame.v_ds = sel_to_selector(cpuState->ds);
        !           101:        saved_state->frame.v_es = sel_to_selector(cpuState->es);
        !           102:        saved_state->frame.v_fs = sel_to_selector(cpuState->fs);
        !           103:        saved_state->frame.v_gs = sel_to_selector(cpuState->gs);
        !           104:     }
        !           105:     
        !           106:     thread_exception_return();
        !           107:     /* NOTREACHED */
        !           108: }
        !           109: 
        !           110: void
        !           111: PCcallMonitor(
        !           112:     thread_t                   thread,
        !           113:     thread_saved_state_t       *saved_state
        !           114: )
        !           115: {
        !           116:     PCshared_t                 shared = threadPCShared(thread);
        !           117:     PCcontext_t                        context = currentContext(shared);
        !           118:     _PCcpuState_t *            cpuState;
        !           119:     
        !           120:     cpuState = &shared->cpuState;
        !           121:     
        !           122:     cpuState->cr0 = (cr0_t) { 0 };     // XXX
        !           123: 
        !           124:     if (context->EM_bit)
        !           125:        cpuState->cr0.em = TRUE;
        !           126:     
        !           127:     if (saved_state->frame.eflags & EFL_VM) {
        !           128:        cpuState->cr0.pe = FALSE;
        !           129:        cpuState->ds = selector_to_sel(saved_state->frame.v_ds);
        !           130:        cpuState->es = selector_to_sel(saved_state->frame.v_es);
        !           131:        cpuState->fs = selector_to_sel(saved_state->frame.v_fs);
        !           132:        cpuState->gs = selector_to_sel(saved_state->frame.v_gs);
        !           133:     }
        !           134:     else {
        !           135:        cpuState->cr0.pe = TRUE;
        !           136:        cpuState->ds = saved_state->regs.ds;
        !           137:        cpuState->es = saved_state->regs.es;
        !           138:        cpuState->fs = saved_state->regs.fs;
        !           139:        cpuState->gs = saved_state->regs.gs;
        !           140:     }
        !           141:     
        !           142:     cpuState->eflags = saved_state->frame.eflags;
        !           143:     if (context->IF_flag)
        !           144:        cpuState->eflags |= EFL_IF;
        !           145:     else
        !           146:        cpuState->eflags &= ~EFL_IF;
        !           147:        
        !           148:     cpuState->eflags |= (context->X_flags & (EFL_NT | EFL_IOPL));
        !           149: 
        !           150:     cpuState->cs = saved_state->frame.cs;
        !           151:     cpuState->eip = saved_state->frame.eip;
        !           152: 
        !           153:     cpuState->ss = saved_state->frame.ss;
        !           154:     cpuState->esp = saved_state->frame.esp;
        !           155: 
        !           156:     cpuState->ebp = saved_state->regs.ebp;
        !           157:     cpuState->esi = saved_state->regs.esi;
        !           158:     cpuState->edi = saved_state->regs.edi;
        !           159:     cpuState->edx = saved_state->regs.edx;
        !           160:     cpuState->ecx = saved_state->regs.ecx;
        !           161:     cpuState->ebx = saved_state->regs.ebx;
        !           162:     cpuState->eax = saved_state->regs.eax;
        !           163:        
        !           164:     context->running = FALSE;
        !           165:     
        !           166:     setts();
        !           167:     
        !           168:     PCdeliverTimers(context);
        !           169:        
        !           170:     saved_state->regs.ds = UDATA_SEL;
        !           171:     saved_state->regs.es = UDATA_SEL;
        !           172:     saved_state->regs.fs = NULL_SEL;
        !           173:     saved_state->regs.gs = NULL_SEL;
        !           174:     
        !           175:     saved_state->frame.cs = UCODE_SEL;
        !           176:     saved_state->frame.eip = (unsigned int)shared->callbackHelper;
        !           177:     
        !           178:     saved_state->frame.ss = UDATA_SEL;
        !           179:     saved_state->frame.esp = context->runState.sc_esp;
        !           180:     saved_state->regs.ebp = 0;
        !           181:     
        !           182:     saved_state->frame.eflags &= ~(EFL_VM | EFL_DF | EFL_TF);
        !           183:     
        !           184:     thread_exception_return();
        !           185:     /* NOTREACHED */
        !           186: }
        !           187: 
        !           188: boolean_t
        !           189: PCbopFA(
        !           190:     thread_t                   thread,
        !           191:     thread_saved_state_t       *state,
        !           192:     PCbopFA_t                  *args
        !           193: )
        !           194: {
        !           195:     if (args->cs.ti != SEL_LDT)
        !           196:        return (FALSE);
        !           197:     
        !           198:     state->frame.eip = args->eip;
        !           199:     state->frame.cs = args->cs;
        !           200:     state->frame.eflags = args->eflags;
        !           201:     state->frame.eflags &= ~( EFL_VM | EFL_NT | EFL_IOPL | EFL_CLR );
        !           202:     state->frame.eflags |=  ( EFL_IF | EFL_SET );
        !           203:     state->frame.esp = args->esp;
        !           204:     state->frame.ss = args->ss;
        !           205: 
        !           206:     thread_exception_return();
        !           207:     /* NOTREACHED*/
        !           208: }
        !           209: 
        !           210: boolean_t
        !           211: PCbopFC(
        !           212:     thread_t                   thread,
        !           213:     thread_saved_state_t       *state,
        !           214:     PCbopFC_t                  *args
        !           215: )
        !           216: {
        !           217:     if (args->cs.ti != SEL_LDT)
        !           218:        return (FALSE);
        !           219:     
        !           220:     state->frame.eip = args->ip;
        !           221:     state->frame.cs = args->cs;
        !           222:     state->frame.eflags = args->flags;
        !           223:     state->frame.eflags &= ~( EFL_VM | EFL_NT | EFL_IOPL | EFL_CLR );
        !           224:     state->frame.eflags |=  ( EFL_IF | EFL_SET );
        !           225:     state->frame.esp = args->sp;
        !           226:     state->frame.ss = args->ss;
        !           227: 
        !           228:     thread_exception_return();
        !           229:     /* NOTREACHED*/
        !           230: }
        !           231: 
        !           232: void
        !           233: PCbopFD(
        !           234:     thread_t                   thread,
        !           235:     thread_saved_state_t       *state,
        !           236:     PCbopFD_t                  *args
        !           237: )
        !           238: {
        !           239:     state->frame.eip = args->eip;
        !           240:     state->frame.cs = args->cs;
        !           241:     state->frame.eflags = args->eflags;
        !           242:     state->frame.eflags &= ~( EFL_NT | EFL_IOPL | EFL_CLR );
        !           243:     state->frame.eflags |=  ( EFL_VM | EFL_IF | EFL_SET );
        !           244:     state->frame.esp = args->esp;
        !           245:     state->frame.ss = args->ss;
        !           246:     
        !           247:     state->regs.ds = NULL_SEL;
        !           248:     state->regs.es = NULL_SEL;
        !           249:     state->regs.fs = NULL_SEL;
        !           250:     state->regs.gs = NULL_SEL;
        !           251: 
        !           252:     thread_exception_return();
        !           253:     /* NOTREACHED*/
        !           254: }

This archive runs on limited infrastructure. Preserving old code on modern bandwidth. Automated agents are requested to crawl responsibly.