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| Current File : //sys/amd64/compile/hs32/modules/usr/src/sys/modules/patm/@/powerpc/booke/swtch.S |
/*- * 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. * * from: $NetBSD: locore.S,v 1.24 2000/05/31 05:09:17 thorpej Exp $ * from: $FreeBSD: release/9.1.0/sys/powerpc/booke/swtch.S 209975 2010-07-13 05:32:19Z nwhitehorn $ * * $FreeBSD: release/9.1.0/sys/powerpc/booke/swtch.S 209975 2010-07-13 05:32:19Z nwhitehorn $ */ /*- * 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 <sys/syscall.h> #include <machine/trap.h> #include <machine/param.h> #include <machine/asm.h> #include <machine/spr.h> /* * void cpu_throw(struct thread *old, struct thread *new) */ ENTRY(cpu_throw) mr %r15, %r4 b cpu_switchin /* * void cpu_switch(struct thread *old, struct thread *new, struct mutex *mtx);) * * Switch to a new thread saving the current state in the old thread. */ ENTRY(cpu_switch) stw %r5, TD_LOCK(%r3) lwz %r5, TD_PCB(%r3) /* Get the old thread's PCB ptr */ mr %r12, %r2 stmw %r12, PCB_CONTEXT(%r5) /* Save the non-volatile GP regs. These can now be used for scratch */ mfcr %r16 /* Save the condition register */ stw %r16, PCB_CR(%r5) mflr %r16 /* Save the link register */ stw %r16, PCB_LR(%r5) mfctr %r16 stw %r16, PCB_BOOKE_CTR(%r5) mfxer %r16 stw %r16, PCB_BOOKE_XER(%r5) mfspr %r16, SPR_DBCR0 stw %r16, PCB_BOOKE_DBCR0(%r5) stw %r1, PCB_SP(%r5) /* Save the stack pointer */ mr %r14, %r3 /* Copy the old thread ptr... */ mr %r15, %r4 /* and the new thread ptr in scratch */ bl pmap_deactivate /* Deactivate the current pmap */ cpu_switchin: mr %r3, %r15 /* Get new thread ptr */ bl pmap_activate /* Activate the new address space */ mfsprg %r7, 0 /* Get the pcpu pointer */ stw %r15, PC_CURTHREAD(%r7) /* Store new current thread */ lwz %r17, TD_PCB(%r15) /* Store new current PCB */ stw %r17, PC_CURPCB(%r7) mr %r3, %r17 /* Recover PCB ptr */ 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_BOOKE_CTR(%r3) mtctr %r5 lwz %r5, PCB_BOOKE_XER(%r3) mtxer %r5 lwz %r5, PCB_BOOKE_DBCR0(%r3) mtspr SPR_DBCR0, %r5 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, CF_SIZE-FSP /* Allow 8 bytes in front of trapframe to simulate FRAME_SETUP does when allocating space for a frame pointer/saved LR */ b trapexit