/* $FreeBSD$ */ /* $NetBSD: locore.S,v 1.24 2000/05/31 05:09:17 thorpej Exp $ */ /* * Copyright (C) 2001 Benno Rice * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY Benno Rice ``AS IS'' AND ANY EXPRESS OR * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ /* * Copyright (C) 1995, 1996 Wolfgang Solfrank. * Copyright (C) 1995, 1996 TooLs GmbH. * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by TooLs GmbH. * 4. The name of TooLs GmbH may not be used to endorse or promote products * derived from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ #include "assym.s" #include #include #include #include #include #include /* * void cpu_switch() * Find a runnable thread and switch to it. */ ENTRY(cpu_switch) mfsprg %r3,0 /* Get the pcpu pointer */ lwz %r4,PC_CURTHREAD(%r3) /* Get the current thread */ lwz %r3,TD_PCB(%r4) /* Get a pointer to the PCB */ mr %r12,%r2 stmw %r12,PCB_CONTEXT(%r3) /* Save the non-volatile GP regs */ mr %r14,%r3 /* Copy the current pcb pointer */ mr %r15,%r4 /* ... and the curthread pointer */ mfcr %r16 /* Save the condition register */ stw %r16,PCB_CR(%r3) mflr %r16 /* Save the link register */ stw %r16,PCB_LR(%r3) mfsr %r16,USER_SR /* Save USER_SR for copyin/out */ isync stw %r16,PCB_USR(%r3) stw %r1,PCB_SP(%r3) /* Save the stack pointer */ lwz %r5,PCB_FLAGS(%r3) /* Save FPU context if needed */ andi. %r5, %r5, PCB_FPU beq .L1 mr %r3,%r15 bl save_fpu .L1: bl choosethread /* Find a new thread to run */ cmplw 0,%r3,%r15 /* Compare to curthread */ beq .L2 /* If it's the same, we're done */ mr %r16,%r3 /* Save off the (struct thread *) */ mr %r3,%r15 bl pmap_deactivate /* Deactivate the current pmap */ mr %r3,%r16 bl pmap_activate /* Activate the new address space */ mfsprg %r4,0 /* Get the pcpu pointer */ stw %r16,PC_CURTHREAD(%r4) /* Store new current thread */ mr %r3,%r16 /* and save in r3 */ lwz %r17,TD_PCB(%r16) /* Store new current PCB */ stw %r17,PC_CURPCB(%r4) lwz %r5, PCB_FLAGS(%r17) /* Restore FPU context if needed */ andi. %r5, %r5, PCB_FPU beq .L2 bl enable_fpu mr %r3,%r16 /* Recover new curthread */ /* thread to restore is in r3 */ .L2: lwz %r3, TD_PCB(%r3) lmw %r12,PCB_CONTEXT(%r3) /* Load the non-volatile GP regs */ mr %r2,%r12 lwz %r5,PCB_CR(%r3) /* Load the condition register */ mtcr %r5 lwz %r5,PCB_LR(%r3) /* Load the link register */ mtlr %r5 lwz %r5,PCB_USR(%r3) /* Load the USER_SR segment reg */ mtsr USER_SR,%r5 isync lwz %r1,PCB_SP(%r3) /* Load the stack pointer */ blr /* * savectx(pcb) * Update pcb, saving current processor state */ ENTRY(savectx) mr %r12,%r2 stmw %r12,PCB_CONTEXT(%r3) /* Save the non-volatile GP regs */ mfcr %r4 /* Save the condition register */ stw %r4,PCB_CONTEXT(%r3) blr /* * fork_trampoline() * Set up the return from cpu_fork() */ ENTRY(fork_trampoline) lwz %r3,CF_FUNC(%r1) lwz %r4,CF_ARG0(%r1) lwz %r5,CF_ARG1(%r1) bl fork_exit addi %r1,%r1,4 b trapexit