| | 1 | /* |
| | 2 | * Copyright (c) 2000 Apple Computer, Inc. All rights reserved. |
| | 3 | * |
| | 4 | * @APPLE_LICENSE_HEADER_START@ |
| | 5 | * |
| | 6 | * The contents of this file constitute Original Code as defined in and |
| | 7 | * are subject to the Apple Public Source License Version 1.1 (the |
| | 8 | * "License"). You may not use this file except in compliance with the |
| | 9 | * License. Please obtain a copy of the License at |
| | 10 | * http://www.apple.com/publicsource and read it before using this file. |
| | 11 | * |
| | 12 | * This Original Code and all software distributed under the License are |
| | 13 | * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER |
| | 14 | * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, |
| | 15 | * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, |
| | 16 | * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the |
| | 17 | * License for the specific language governing rights and limitations |
| | 18 | * under the License. |
| | 19 | * |
| | 20 | * @APPLE_LICENSE_HEADER_END@ |
| | 21 | */ |
| | 22 | /* |
| | 23 | * @OSF_COPYRIGHT@ |
| | 24 | */ |
| | 25 | /* |
| | 26 | * Mach Operating System |
| | 27 | * Copyright (c) 1991,1990 Carnegie Mellon University |
| | 28 | * All Rights Reserved. |
| | 29 | * |
| | 30 | * Permission to use, copy, modify and distribute this software and its |
| | 31 | * documentation is hereby granted, provided that both the copyright |
| | 32 | * notice and this permission notice appear in all copies of the |
| | 33 | * software, derivative works or modified versions, and any portions |
| | 34 | * thereof, and that both notices appear in supporting documentation. |
| | 35 | * |
| | 36 | * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS" |
| | 37 | * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR |
| | 38 | * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. |
| | 39 | * |
| | 40 | * Carnegie Mellon requests users of this software to return to |
| | 41 | * |
| | 42 | * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU |
| | 43 | * School of Computer Science |
| | 44 | * Carnegie Mellon University |
| | 45 | * Pittsburgh PA 15213-3890 |
| | 46 | * |
| | 47 | * any improvements or extensions that they make and grant Carnegie Mellon |
| | 48 | * the rights to redistribute these changes. |
| | 49 | */ |
| | 50 | /* |
| | 51 | */ |
| | 52 | |
| | 53 | #include <cpus.h> |
| | 54 | #include <platforms.h> |
| | 55 | |
| | 56 | #include <i386/asm.h> |
| | 57 | #include <i386/proc_reg.h> |
| | 58 | #include <assym.s> |
| | 59 | |
| | 60 | #if NCPUS > 1 |
| | 61 | |
| | 62 | #ifdef SYMMETRY |
| | 63 | #include <sqt/asm_macros.h> |
| | 64 | #endif |
| | 65 | |
| | 66 | #if AT386 |
| | 67 | #include <i386/mp.h> |
| | 68 | #endif /* AT386 */ |
| | 69 | |
| | 70 | #define CX(addr, reg) addr(,reg,4) |
| | 71 | |
| | 72 | #else /* NCPUS == 1 */ |
| | 73 | |
| | 74 | #define CPU_NUMBER(reg) |
| | 75 | #define CX(addr,reg) addr |
| | 76 | |
| | 77 | #endif /* NCPUS == 1 */ |
| | 78 | |
| | 79 | /* |
| | 80 | * Context switch routines for i386. |
| | 81 | */ |
| | 82 | |
| | 83 | Entry(Load_context) |
| | 84 | movl S_ARG0,%ecx /* get thread */ |
| | 85 | movl TH_KERNEL_STACK(%ecx),%ecx /* get kernel stack */ |
| | 86 | lea KERNEL_STACK_SIZE-IKS_SIZE-IEL_SIZE(%ecx),%edx |
| | 87 | /* point to stack top */ |
| | 88 | CPU_NUMBER(%eax) |
| | 89 | movl %ecx,CX(EXT(active_stacks),%eax) /* store stack address */ |
| | 90 | movl %edx,CX(EXT(kernel_stack),%eax) /* store stack top */ |
| | 91 | |
| | 92 | movl KSS_ESP(%ecx),%esp /* switch stacks */ |
| | 93 | movl KSS_ESI(%ecx),%esi /* restore registers */ |
| | 94 | movl KSS_EDI(%ecx),%edi |
| | 95 | movl KSS_EBP(%ecx),%ebp |
| | 96 | movl KSS_EBX(%ecx),%ebx |
| | 97 | xorl %eax,%eax /* return zero (no old thread) */ |
| | 98 | jmp *KSS_EIP(%ecx) /* resume thread */ |
| | 99 | |
| | 100 | /* |
| | 101 | * This really only has to save registers |
| | 102 | * when there is no explicit continuation. |
| | 103 | */ |
| | 104 | |
| | 105 | Entry(Switch_context) |
| | 106 | CPU_NUMBER(%edx) |
| | 107 | movl CX(EXT(active_stacks),%edx),%ecx /* get old kernel stack */ |
| | 108 | |
| | 109 | movl %ebx,KSS_EBX(%ecx) /* save registers */ |
| | 110 | movl %ebp,KSS_EBP(%ecx) |
| | 111 | movl %edi,KSS_EDI(%ecx) |
| | 112 | movl %esi,KSS_ESI(%ecx) |
| | 113 | popl KSS_EIP(%ecx) /* save return PC */ |
| | 114 | movl %esp,KSS_ESP(%ecx) /* save SP */ |
| | 115 | |
| | 116 | movl 0(%esp),%eax /* return old thread */ |
| | 117 | movl 8(%esp),%esi /* get new thread */ |
| | 118 | movl TH_TOP_ACT(%esi),%ebx /* get new_thread->top_act */ |
| | 119 | movl $ CPD_ACTIVE_THREAD,%ecx |
| | 120 | movl %ebx,%gs:(%ecx) /* new thread is active */ |
| | 121 | movl TH_KERNEL_STACK(%esi),%ecx /* get its kernel stack */ |
| | 122 | lea KERNEL_STACK_SIZE-IKS_SIZE-IEL_SIZE(%ecx),%ebx |
| | 123 | /* point to stack top */ |
| | 124 | |
| | 125 | movl %ecx,CX(EXT(active_stacks),%edx) /* set current stack */ |
| | 126 | movl %ebx,CX(EXT(kernel_stack),%edx) /* set stack top */ |
| | 127 | |
| | 128 | |
| | 129 | movl $0,CX(EXT(active_kloaded),%edx) |
| | 130 | |
| | 131 | movl KSS_ESP(%ecx),%esp /* switch stacks */ |
| | 132 | movl KSS_ESI(%ecx),%esi /* restore registers */ |
| | 133 | movl KSS_EDI(%ecx),%edi |
| | 134 | movl KSS_EBP(%ecx),%ebp |
| | 135 | movl KSS_EBX(%ecx),%ebx |
| | 136 | jmp *KSS_EIP(%ecx) /* return old thread */ |
| | 137 | |
| | 138 | Entry(Thread_continue) |
| | 139 | pushl %eax /* push the thread argument */ |
| | 140 | xorl %ebp,%ebp /* zero frame pointer */ |
| | 141 | call *%ebx /* call real continuation */ |
| | 142 | |
| | 143 | #if NCPUS > 1 |
| | 144 | /* |
| | 145 | * void switch_to_shutdown_context(thread_t thread, |
| | 146 | * void (*routine)(processor_t), |
| | 147 | * processor_t processor) |
| | 148 | * |
| | 149 | * saves the kernel context of the thread, |
| | 150 | * switches to the interrupt stack, |
| | 151 | * continues the thread (with thread_continue), |
| | 152 | * then runs routine on the interrupt stack. |
| | 153 | * |
| | 154 | * Assumes that the thread is a kernel thread (thus |
| | 155 | * has no FPU state) |
| | 156 | */ |
| | 157 | Entry(switch_to_shutdown_context) |
| | 158 | CPU_NUMBER(%edx) |
| | 159 | movl EXT(active_stacks)(,%edx,4),%ecx /* get old kernel stack */ |
| | 160 | movl %ebx,KSS_EBX(%ecx) /* save registers */ |
| | 161 | movl %ebp,KSS_EBP(%ecx) |
| | 162 | movl %edi,KSS_EDI(%ecx) |
| | 163 | movl %esi,KSS_ESI(%ecx) |
| | 164 | popl KSS_EIP(%ecx) /* save return PC */ |
| | 165 | movl %esp,KSS_ESP(%ecx) /* save SP */ |
| | 166 | |
| | 167 | movl 0(%esp),%eax /* get old thread */ |
| | 168 | movl %ecx,TH_KERNEL_STACK(%eax) /* save old stack */ |
| | 169 | movl 4(%esp),%ebx /* get routine to run next */ |
| | 170 | movl 8(%esp),%esi /* get its argument */ |
| | 171 | |
| | 172 | movl CX(EXT(interrupt_stack),%edx),%ecx /* point to its intr stack */ |
| | 173 | lea INTSTACK_SIZE(%ecx),%esp /* switch to it (top) */ |
| | 174 | |
| | 175 | pushl %eax /* push thread */ |
| | 176 | call EXT(thread_dispatch) /* reschedule thread */ |
| | 177 | addl $4,%esp /* clean stack */ |
| | 178 | |
| | 179 | pushl %esi /* push argument */ |
| | 180 | call *%ebx /* call routine to run */ |
| | 181 | hlt /* (should never return) */ |
| | 182 | |
| | 183 | #endif /* NCPUS > 1 */ |
| | 184 | |
| | 185 | .text |
| | 186 | |
| | 187 | .globl EXT(locore_end) |
| | 188 | LEXT(locore_end) |
| | 189 | |
projects / apple / xnu.git / blame_incremental