Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/powerpc/powerpc/swtch.S
Version:
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1 /* $FreeBSD: releng/5.1/sys/powerpc/powerpc/swtch.S 112429 2003-03-20 10:28:20Z grehan $ */ 2 /* $NetBSD: locore.S,v 1.24 2000/05/31 05:09:17 thorpej Exp $ */ 3 4 /* 5 * Copyright (C) 2001 Benno Rice 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * THIS SOFTWARE IS PROVIDED BY Benno Rice ``AS IS'' AND ANY EXPRESS OR 18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 20 * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 21 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 22 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 23 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 24 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 25 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 26 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 */ 28 /* 29 * Copyright (C) 1995, 1996 Wolfgang Solfrank. 30 * Copyright (C) 1995, 1996 TooLs GmbH. 31 * All rights reserved. 32 * 33 * Redistribution and use in source and binary forms, with or without 34 * modification, are permitted provided that the following conditions 35 * are met: 36 * 1. Redistributions of source code must retain the above copyright 37 * notice, this list of conditions and the following disclaimer. 38 * 2. Redistributions in binary form must reproduce the above copyright 39 * notice, this list of conditions and the following disclaimer in the 40 * documentation and/or other materials provided with the distribution. 41 * 3. All advertising materials mentioning features or use of this software 42 * must display the following acknowledgement: 43 * This product includes software developed by TooLs GmbH. 44 * 4. The name of TooLs GmbH may not be used to endorse or promote products 45 * derived from this software without specific prior written permission. 46 * 47 * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR 48 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 49 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 50 * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 51 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 52 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 53 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 54 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 55 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 56 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 57 */ 58 59 #include "assym.s" 60 61 #include <sys/syscall.h> 62 63 #include <machine/trap.h> 64 #include <machine/param.h> 65 #include <machine/sr.h> 66 #include <machine/psl.h> 67 #include <machine/asm.h> 68 69 /* 70 * void cpu_switch() 71 * Find a runnable thread and switch to it. 72 */ 73 ENTRY(cpu_switch) 74 mfsprg %r3,0 /* Get the pcpu pointer */ 75 lwz %r4,PC_CURTHREAD(%r3) /* Get the current thread */ 76 lwz %r3,TD_PCB(%r4) /* Get a pointer to the PCB */ 77 78 mr %r12,%r2 79 stmw %r12,PCB_CONTEXT(%r3) /* Save the non-volatile GP regs */ 80 mr %r14,%r3 /* Copy the current pcb pointer */ 81 mr %r15,%r4 /* ... and the curthread pointer */ 82 mfcr %r16 /* Save the condition register */ 83 stw %r16,PCB_CR(%r3) 84 mflr %r16 /* Save the link register */ 85 stw %r16,PCB_LR(%r3) 86 mfsr %r16,USER_SR /* Save USER_SR for copyin/out */ 87 isync 88 stw %r16,PCB_USR(%r3) 89 stw %r1,PCB_SP(%r3) /* Save the stack pointer */ 90 91 lwz %r5,PCB_FLAGS(%r3) /* Save FPU context if needed */ 92 andi. %r5, %r5, PCB_FPU 93 beq .L1 94 mr %r3,%r15 95 bl save_fpu 96 97 .L1: 98 bl choosethread /* Find a new thread to run */ 99 cmplw 0,%r3,%r15 /* Compare to curthread */ 100 beq .L2 /* If it's the same, we're done */ 101 102 mr %r16,%r3 /* Save off the (struct thread *) */ 103 104 mr %r3,%r15 105 bl pmap_deactivate /* Deactivate the current pmap */ 106 107 mr %r3,%r16 108 bl pmap_activate /* Activate the new address space */ 109 110 mfsprg %r4,0 /* Get the pcpu pointer */ 111 stw %r16,PC_CURTHREAD(%r4) /* Store new current thread */ 112 mr %r3,%r16 /* and save in r3 */ 113 lwz %r17,TD_PCB(%r16) /* Store new current PCB */ 114 stw %r17,PC_CURPCB(%r4) 115 116 lwz %r5, PCB_FLAGS(%r17) /* Restore FPU context if needed */ 117 andi. %r5, %r5, PCB_FPU 118 beq .L2 119 bl enable_fpu 120 mr %r3,%r16 /* Recover new curthread */ 121 122 /* thread to restore is in r3 */ 123 .L2: 124 lwz %r3, TD_PCB(%r3) 125 lmw %r12,PCB_CONTEXT(%r3) /* Load the non-volatile GP regs */ 126 mr %r2,%r12 127 lwz %r5,PCB_CR(%r3) /* Load the condition register */ 128 mtcr %r5 129 lwz %r5,PCB_LR(%r3) /* Load the link register */ 130 mtlr %r5 131 lwz %r5,PCB_USR(%r3) /* Load the USER_SR segment reg */ 132 mtsr USER_SR,%r5 133 isync 134 lwz %r1,PCB_SP(%r3) /* Load the stack pointer */ 135 blr 136 137 /* 138 * savectx(pcb) 139 * Update pcb, saving current processor state 140 */ 141 ENTRY(savectx) 142 mr %r12,%r2 143 stmw %r12,PCB_CONTEXT(%r3) /* Save the non-volatile GP regs */ 144 mfcr %r4 /* Save the condition register */ 145 stw %r4,PCB_CONTEXT(%r3) 146 blr 147 148 /* 149 * fork_trampoline() 150 * Set up the return from cpu_fork() 151 */ 152 ENTRY(fork_trampoline) 153 lwz %r3,CF_FUNC(%r1) 154 lwz %r4,CF_ARG0(%r1) 155 lwz %r5,CF_ARG1(%r1) 156 bl fork_exit 157 addi %r1,%r1,4 158 b trapexit
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