swtch64.S revision 84946
1/* $FreeBSD: head/sys/powerpc/aim/swtch.S 84946 2001-10-15 01:04:49Z mp $ */ 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/pmap.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 mflr %r30 75 mfsprg %r3,%r0 /* Get the globaldata pointer */ 76 lwz %r4,GD_CURTHREAD(%r3) /* Get the current thread */ 77 lwz %r3,TD_PCB(%r4) /* Get a pointer to the PCB */ 78 79 stmw %r14,PCB_CONTEXT(%r3) /* Save the non-volatile GP regs */ 80 mfcr %r4 /* Save the condition register */ 81 stw %r4,PCB_CR(%r3) 82 83 bl choosethread /* Find a new thread to run */ 84 85 mr %r14,%r3 /* Save off the (struct thread *) */ 86 87 bl pmap_activate /* Activate the new address space */ 88 89 mtlr %r30 90 mfsprg %r4,%r0 /* Get the globaldata pointer */ 91 stw %r14,GD_CURTHREAD(%r4) /* Store new current thread */ 92 lwz %r4,TD_PCB(%r14) /* Grab the new PCB */ 93 94 lmw %r14,PCB_CONTEXT(%r4) /* Load the non-volatile GP regs */ 95 lwz %r5,PCB_CR(%r4) /* Load the condition register */ 96 mtcr %r5 97 blr 98 99/* 100 * savectx(pcb) 101 * Update pcb, saving current processor state 102 */ 103ENTRY(savectx) 104 stmw %r14,PCB_CONTEXT(%r3) /* Save the non-volatile GP regs */ 105 mfcr %r4 /* Save the condition register */ 106 stw %r4,PCB_CONTEXT(%r3) 107 blr 108