Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/i386/cswitch.s
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1 /* 2 * Mach Operating System 3 * Copyright (c) 1991,1990 Carnegie Mellon University 4 * All Rights Reserved. 5 * 6 * Permission to use, copy, modify and distribute this software and its 7 * documentation is hereby granted, provided that both the copyright 8 * notice and this permission notice appear in all copies of the 9 * software, derivative works or modified versions, and any portions 10 * thereof, and that both notices appear in supporting documentation. 11 * 12 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS" 13 * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR 14 * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. 15 * 16 * Carnegie Mellon requests users of this software to return to 17 * 18 * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU 19 * School of Computer Science 20 * Carnegie Mellon University 21 * Pittsburgh PA 15213-3890 22 * 23 * any improvements or extensions that they make and grant Carnegie Mellon 24 * the rights to redistribute these changes. 25 */ 26 /* 27 * HISTORY 28 * $Log: cswitch.s,v $ 29 * Revision 2.13 93/02/04 07:55:51 danner 30 * Convert asm comment "/" over to "/ *" "* /" 31 * [93/01/27 rvb] 32 * 33 * Revision 2.12 92/01/03 20:04:43 dbg 34 * Floating-point state is now saved by caller. 35 * [91/10/20 dbg] 36 * 37 * Revision 2.11 91/07/31 17:34:56 dbg 38 * Push user state directly in PCB and switch to kernel stack on 39 * trap entry. 40 * [91/07/30 16:48:18 dbg] 41 * 42 * Revision 2.10 91/06/19 11:54:57 rvb 43 * cputypes.h->platforms.h 44 * [91/06/12 13:44:37 rvb] 45 * 46 * Revision 2.9 91/05/14 16:04:42 mrt 47 * Correcting copyright 48 * 49 * Revision 2.8 91/05/08 12:31:19 dbg 50 * Put parentheses around substituted immediate expressions, so 51 * that they will pass through the GNU preprocessor. 52 * 53 * Handle multiple CPUs. Save floating-point state when saving 54 * context or switching stacks. Add switch_to_shutdown_context to 55 * handle CPU shutdown. 56 * [91/03/21 dbg] 57 * 58 * Revision 2.7 91/03/16 14:43:51 rpd 59 * Renamed Switch_task_context to Switch_context. 60 * [91/02/17 rpd] 61 * Added active_stacks. 62 * [91/01/29 rpd] 63 * 64 * Revision 2.6 91/02/05 17:10:57 mrt 65 * Changed to new Mach copyright 66 * [91/02/01 17:30:50 mrt] 67 * 68 * Revision 2.5 91/01/09 22:41:09 rpd 69 * Renamed to Load_context and Switch_task_context. 70 * Removed ktss munging. 71 * [91/01/09 rpd] 72 * 73 * Revision 2.4 91/01/08 15:10:09 rpd 74 * Minor cleanup. 75 * [90/12/31 rpd] 76 * Added switch_task_context, switch_thread_context. 77 * [90/12/12 rpd] 78 * 79 * Reorganized the pcb. 80 * [90/12/11 rpd] 81 * 82 * Revision 2.3 90/12/20 16:35:48 jeffreyh 83 * Changes for __STDC__ 84 * 85 * Changes for __STDC__ 86 * [90/12/07 15:45:37 jeffreyh] 87 * 88 * 89 * Revision 2.2 90/05/03 15:25:00 dbg 90 * Created. 91 * [90/02/08 dbg] 92 * 93 */ 94 95 #include <cpus.h> 96 #include <platforms.h> 97 98 #include <i386/asm.h> 99 #include <i386/proc_reg.h> 100 #include <assym.s> 101 102 #if NCPUS > 1 103 104 #ifdef SYMMETRY 105 #include <sqt/asm_macros.h> 106 #endif 107 108 #define CX(addr, reg) addr(,reg,4) 109 110 #else /* NCPUS == 1 */ 111 112 #define CPU_NUMBER(reg) 113 #define CX(addr,reg) addr 114 115 #endif /* NCPUS == 1 */ 116 117 /* 118 * Context switch routines for i386. 119 */ 120 121 ENTRY(Load_context) 122 movl S_ARG0,%ecx /* get thread */ 123 movl TH_KERNEL_STACK(%ecx),%ecx /* get kernel stack */ 124 lea KERNEL_STACK_SIZE-IKS_SIZE-IEL_SIZE(%ecx),%edx 125 /* point to stack top */ 126 CPU_NUMBER(%eax) 127 movl %ecx,CX(_active_stacks,%eax) /* store stack address */ 128 movl %edx,CX(_kernel_stack,%eax) /* store stack top */ 129 130 movl KSS_ESP(%ecx),%esp /* switch stacks */ 131 movl KSS_ESI(%ecx),%esi /* restore registers */ 132 movl KSS_EDI(%ecx),%edi 133 movl KSS_EBP(%ecx),%ebp 134 movl KSS_EBX(%ecx),%ebx 135 xorl %eax,%eax /* return zero (no old thread) */ 136 jmp *KSS_EIP(%ecx) /* resume thread */ 137 138 /* 139 * This really only has to save registers 140 * when there is no explicit continuation. 141 */ 142 143 ENTRY(Switch_context) 144 CPU_NUMBER(%edx) 145 movl CX(_active_stacks,%edx),%ecx /* get old kernel stack */ 146 147 movl %ebx,KSS_EBX(%ecx) /* save registers */ 148 movl %ebp,KSS_EBP(%ecx) 149 movl %edi,KSS_EDI(%ecx) 150 movl %esi,KSS_ESI(%ecx) 151 popl KSS_EIP(%ecx) /* save return PC */ 152 movl %esp,KSS_ESP(%ecx) /* save SP */ 153 154 movl 0(%esp),%eax /* get old thread */ 155 movl %ecx,TH_KERNEL_STACK(%eax) /* save old stack */ 156 movl 4(%esp),%ebx /* get continuation */ 157 movl %ebx,TH_SWAP_FUNC(%eax) /* save continuation */ 158 159 movl 8(%esp),%esi /* get new thread */ 160 161 movl TH_KERNEL_STACK(%esi),%ecx /* get its kernel stack */ 162 lea KERNEL_STACK_SIZE-IKS_SIZE-IEL_SIZE(%ecx),%ebx 163 /* point to stack top */ 164 165 movl %esi,CX(_active_threads,%edx) /* new thread is active */ 166 movl %ecx,CX(_active_stacks,%edx) /* set current stack */ 167 movl %ebx,CX(_kernel_stack,%edx) /* set stack top */ 168 169 movl KSS_ESP(%ecx),%esp /* switch stacks */ 170 movl KSS_ESI(%ecx),%esi /* restore registers */ 171 movl KSS_EDI(%ecx),%edi 172 movl KSS_EBP(%ecx),%ebp 173 movl KSS_EBX(%ecx),%ebx 174 jmp *KSS_EIP(%ecx) /* return old thread */ 175 176 ENTRY(Thread_continue) 177 pushl %eax /* push the thread argument */ 178 xorl %ebp,%ebp /* zero frame pointer */ 179 call *%ebx /* call real continuation */ 180 181 #if NCPUS > 1 182 /* 183 * void switch_to_shutdown_context(thread_t thread, 184 * void (*routine)(processor_t), 185 * processor_t processor) 186 * 187 * saves the kernel context of the thread, 188 * switches to the interrupt stack, 189 * continues the thread (with thread_continue), 190 * then runs routine on the interrupt stack. 191 * 192 * Assumes that the thread is a kernel thread (thus 193 * has no FPU state) 194 */ 195 ENTRY(switch_to_shutdown_context) 196 CPU_NUMBER(%edx) 197 movl _active_stacks(,%edx,4),%ecx /* get old kernel stack */ 198 movl %ebx,KSS_EBX(%ecx) /* save registers */ 199 movl %ebp,KSS_EBP(%ecx) 200 movl %edi,KSS_EDI(%ecx) 201 movl %esi,KSS_ESI(%ecx) 202 popl KSS_EIP(%ecx) /* save return PC */ 203 movl %esp,KSS_ESP(%ecx) /* save SP */ 204 205 movl 0(%esp),%eax /* get old thread */ 206 movl %ecx,TH_KERNEL_STACK(%eax) /* save old stack */ 207 movl $0,TH_SWAP_FUNC(%eax) /* clear continuation */ 208 movl 4(%esp),%ebx /* get routine to run next */ 209 movl 8(%esp),%esi /* get its argument */ 210 211 movl _interrupt_stack(,%edx,4),%ecx /* point to its interrupt stack */ 212 lea INTSTACK_SIZE(%ecx),%esp /* switch to it (top) */ 213 214 pushl %eax /* push thread */ 215 call EXT(thread_dispatch) /* reschedule thread */ 216 addl $4,%esp /* clean stack */ 217 218 pushl %esi /* push argument */ 219 call *%ebx /* call routine to run */ 220 hlt /* (should never return) */ 221 222 #endif NCPUS > 1 223
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