swtch64.S revision 99659
1/* $FreeBSD: head/sys/powerpc/aim/swtch.S 99659 2002-07-09 12:57:23Z benno $ */ 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 */ 73ENTRY(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 stw %r1,PCB_SP(%r3) /* Save the stack pointer */ 87 88#if 0 89 lwz %r29,PCB_FLAGS(%r3) 90 andi. %r9, %r29, 1 /* XXX - don't hard code */ 91 beq .L1 92 bl save_fpu 93#endif 94 95.L1: 96 bl choosethread /* Find a new thread to run */ 97 cmplw 0,%r3,%r15 /* Compare to curthread */ 98 beq .L2 /* If it's the same, we're done */ 99 100 mr %r16,%r3 /* Save off the (struct thread *) */ 101 102 mr %r3,%r15 103 bl pmap_deactivate /* Deactivate the current pmap */ 104 105 mr %r3,%r16 106 bl pmap_activate /* Activate the new address space */ 107 108 mfsprg %r4,0 /* Get the pcpu pointer */ 109 stw %r16,PC_CURTHREAD(%r4) /* Store new current thread */ 110 mr %r3,%r16 /* and save in r3 */ 111 lwz %r16,TD_PCB(%r16) /* Store new current PCB */ 112 stw %r16,PC_CURPCB(%r4) 113 114#if 0 115 lwz %r29, PCB_FLAGS(%r4) /* Restore FPU regs if needed */ 116 andi. %r9, %r29, 1 117 beq .L2 118 mr %r3, %r4 119 bl enable_fpu 120#endif 121 122 /* thread to restore is in r3 */ 123.L2: 124 li %r15,TDS_RUNNING 125 stw %r15,TD_STATE(%r3) /* Set KSE state */ 126 lwz %r3, TD_PCB(%r3) 127 lmw %r12,PCB_CONTEXT(%r3) /* Load the non-volatile GP regs */ 128 mr %r2,%r12 129 lwz %r5,PCB_CR(%r3) /* Load the condition register */ 130 mtcr %r5 131 lwz %r5,PCB_LR(%r3) /* Load the link register */ 132 mtlr %r5 133 lwz %r1,PCB_SP(%r3) /* Load the stack pointer */ 134 blr 135 136/* 137 * savectx(pcb) 138 * Update pcb, saving current processor state 139 */ 140ENTRY(savectx) 141 mr %r12,%r2 142 stmw %r12,PCB_CONTEXT(%r3) /* Save the non-volatile GP regs */ 143 mfcr %r4 /* Save the condition register */ 144 stw %r4,PCB_CONTEXT(%r3) 145 blr 146 147/* 148 * fork_trampoline() 149 * Set up the return from cpu_fork() 150 */ 151ENTRY(fork_trampoline) 152 lwz %r3,CF_FUNC(%r1) 153 lwz %r4,CF_ARG0(%r1) 154 lwz %r5,CF_ARG1(%r1) 155 bl fork_exit 156 addi %r1,%r1,4 157 b trapexit 158