1/* $FreeBSD$ */ 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.inc" 60#include "opt_sched.h" 61 62#include <sys/syscall.h> 63 64#include <machine/trap.h> 65#include <machine/param.h> 66#include <machine/asm.h> 67#include <machine/spr.h> 68 69/* 70 * void cpu_throw(struct thread *old, struct thread *new) 71 */ 72ENTRY(cpu_throw) 73 mr %r2, %r4 74 li %r14,0 /* Tell cpu_switchin not to release a thread */ 75 76 b cpu_switchin 77 78/* 79 * void cpu_switch(struct thread *old, 80 * struct thread *new, 81 * struct mutex *mtx); 82 * 83 * Switch to a new thread saving the current state in the old thread. 84 */ 85ENTRY(cpu_switch) 86 lwz %r6,TD_PCB(%r3) /* Get the old thread's PCB ptr */ 87 stmw %r12,PCB_CONTEXT(%r6) /* Save the non-volatile GP regs. 88 These can now be used for scratch */ 89 90 mfcr %r16 /* Save the condition register */ 91 stw %r16,PCB_CR(%r6) 92 mflr %r16 /* Save the link register */ 93 stw %r16,PCB_LR(%r6) 94 stw %r1,PCB_SP(%r6) /* Save the stack pointer */ 95 96 mr %r14,%r3 /* Copy the old thread ptr... */ 97 mr %r2,%r4 /* and the new thread ptr in curthread */ 98 mr %r16,%r5 /* and the new lock */ 99 mr %r17,%r6 /* and the PCB */ 100 101 lwz %r18,PCB_FLAGS(%r17) 102 /* Save FPU context if needed */ 103 andi. %r7, %r18, PCB_FPU 104 beq .L1 105 bl save_fpu 106 107.L1: 108 mr %r3,%r14 /* restore old thread ptr */ 109 /* Save Altivec context if needed */ 110 andi. %r7, %r18, PCB_VEC 111 beq .L2 112 bl save_vec 113 114.L2: 115#if defined(__SPE__) 116 mfspr %r3,SPR_SPEFSCR 117 stw %r3,PCB_VSCR(%r17) 118#endif 119 mr %r3,%r14 /* restore old thread ptr */ 120 bl pmap_deactivate /* Deactivate the current pmap */ 121 122 sync /* Make sure all of that finished */ 123 124cpu_switchin: 125#if defined(SMP) && defined(SCHED_ULE) 126 /* Wait for the new thread to become unblocked */ 127 bl _GLOBAL_OFFSET_TABLE_@local-4 128 mflr %r6 129 lwz %r6,blocked_lock@got(%r6) 130blocked_loop: 131 lwz %r7,TD_LOCK(%r2) 132 cmpw %r6,%r7 133 beq- blocked_loop 134 isync 135#endif 136 137 lwz %r17,TD_PCB(%r2) /* Get new current PCB */ 138 lwz %r1,PCB_SP(%r17) /* Load new stack pointer */ 139 140 /* Release old thread now that we have a stack pointer set up */ 141 cmpwi %r14,0 142 beq- 1f 143 stw %r16,TD_LOCK(%r14) /* ULE: update old thread's lock */ 144 1451: mfsprg %r7,0 /* Get the pcpu pointer */ 146 stw %r2,PC_CURTHREAD(%r7) /* Store new current thread */ 147 lwz %r17,TD_PCB(%r2) /* Store new current PCB */ 148 stw %r17,PC_CURPCB(%r7) 149 150 mr %r3,%r2 /* Get new thread ptr */ 151 bl pmap_activate /* Activate the new address space */ 152 153 lwz %r19, PCB_FLAGS(%r17) 154 /* Restore FPU context if needed */ 155 andi. %r6, %r19, PCB_FPU 156 beq .L3 157 mr %r3,%r2 /* Pass curthread to enable_fpu */ 158 bl enable_fpu 159 160.L3: 161 /* Restore Altivec context if needed */ 162 andi. %r6, %r19, PCB_VEC 163 beq .L4 164 mr %r3,%r2 /* Pass curthread to enable_vec */ 165 bl enable_vec 166 167.L4: 168#if defined(__SPE__) 169 lwz %r3,PCB_VSCR(%r17) 170 mtspr SPR_SPEFSCR,%r3 171#endif 172 /* thread to restore is in r3 */ 173 mr %r3,%r17 /* Recover PCB ptr */ 174 lmw %r12,PCB_CONTEXT(%r3) /* Load the non-volatile GP regs */ 175 lwz %r5,PCB_CR(%r3) /* Load the condition register */ 176 mtcr %r5 177 lwz %r5,PCB_LR(%r3) /* Load the link register */ 178 mtlr %r5 179 lwz %r1,PCB_SP(%r3) /* Load the stack pointer */ 180 /* 181 * Perform a dummy stwcx. to clear any reservations we may have 182 * inherited from the previous thread. It doesn't matter if the 183 * stwcx succeeds or not. pcb_context[0] can be clobbered. 184 */ 185 stwcx. %r1, 0, %r3 186 blr 187 188/* 189 * savectx(pcb) 190 * Update pcb, saving current processor state 191 */ 192ENTRY(savectx) 193 stmw %r12,PCB_CONTEXT(%r3) /* Save the non-volatile GP regs */ 194 mfcr %r4 /* Save the condition register */ 195 stw %r4,PCB_CR(%r3) 196 stw %r1,PCB_SP(%r3) /* Save the stack pointer */ 197 mflr %r4 /* Save the link register */ 198 stw %r4,PCB_LR(%r3) 199 blr 200 201/* 202 * fork_trampoline() 203 * Set up the return from cpu_fork() 204 */ 205ENTRY(fork_trampoline) 206 lwz %r3,CF_FUNC(%r1) 207 lwz %r4,CF_ARG0(%r1) 208 lwz %r5,CF_ARG1(%r1) 209 bl fork_exit 210 addi %r1,%r1,CF_SIZE-FSP /* Allow 8 bytes in front of 211 trapframe to simulate FRAME_SETUP 212 does when allocating space for 213 a frame pointer/saved LR */ 214#ifdef __SPE__ 215 li %r3,SPEFSCR_FINVE|SPEFSCR_FDBZE|SPEFSCR_FUNFE|SPEFSCR_FOVFE 216 mtspr SPR_SPEFSCR, %r3 217#endif 218 b trapexit 219