b40ce4165d
Note ALL MODULES MUST BE RECOMPILED make the kernel aware that there are smaller units of scheduling than the process. (but only allow one thread per process at this time). This is functionally equivalent to teh previousl -current except that there is a thread associated with each process. Sorry john! (your next MFC will be a doosie!) Reviewed by: peter@freebsd.org, dillon@freebsd.org X-MFC after: ha ha ha ha
245 lines
6.6 KiB
ArmAsm
245 lines
6.6 KiB
ArmAsm
/* $FreeBSD$ */
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/* $NetBSD: locore.S,v 1.24 2000/05/31 05:09:17 thorpej Exp $ */
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/*
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* Copyright (C) 2001 Benno Rice
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY Benno Rice ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* Copyright (C) 1995, 1996 Wolfgang Solfrank.
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* Copyright (C) 1995, 1996 TooLs GmbH.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by TooLs GmbH.
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* 4. The name of TooLs GmbH may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "assym.s"
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#include <sys/syscall.h>
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#include <machine/trap.h>
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#include <machine/param.h>
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#include <machine/pmap.h>
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#include <machine/psl.h>
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#include <machine/asm.h>
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/*
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* Some instructions gas doesn't understand (yet?)
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*/
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#define bdneq bdnzf 2,
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/*
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* No processes are runnable, so loop waiting for one.
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* Separate label here for accounting purposes.
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*/
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#if 0 /* XXX: I think this is now unneeded. Leaving it in just in case. */
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ASENTRY(Idle)
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mfmsr 3
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andi. 3,3,~PSL_EE@l /* disable interrupts while
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manipulating runque */
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mtmsr 3
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lis 8,sched_whichqs@ha
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lwz 9,sched_whichqs@l(8)
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or. 9,9,9
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bne- .Lsw1 /* at least one queue non-empty */
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ori 3,3,PSL_EE@l /* reenable ints again */
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mtmsr 3
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isync
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/* Check if we can use power saving mode */
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lis 8,powersave@ha
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lwz 9,powersave@l(8)
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or. 9,9,9
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beq 1f
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sync
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oris 3,3,PSL_POW@h /* enter power saving mode */
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mtmsr 3
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isync
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1:
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b _ASM_LABEL(Idle)
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#endif /* XXX */
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/*
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* switchexit gets called from cpu_exit to complete the exit procedure.
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*/
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ENTRY(switchexit)
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/* First switch to the idle pcb/kernel stack */
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#if 0 /* XXX */
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lis 6,idle_u@ha
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lwz 6,idle_u@l(6)
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mfsprg 7,0
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stw 6,GD_CURPCB(7)
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#endif
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addi 1,6,USPACE-16 /* 16 bytes are reserved at stack top */
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/*
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* Schedule the vmspace and stack to be freed (the proc arg is
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* already in r3).
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*/
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bl sys_exit
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/* Fall through to cpu_switch to actually select another proc */
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li 3,0 /* indicate exited process */
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/*
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* void cpu_switch(struct proc *p)
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* Find a runnable process and switch to it.
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*/
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/* XXX noprofile? --thorpej@netbsd.org */
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ENTRY(cpu_switch)
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mflr 0 /* save lr */
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stw 0,4(1)
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stwu 1,-16(1)
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stw 31,12(1)
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stw 30,8(1)
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mr 30,3
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mfsprg 3,0
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xor 31,31,31
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stw 31,GD_CURTHREAD(3) /* Zero to not accumulate cpu time */
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mfsprg 3,0
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lwz 31,GD_CURPCB(3)
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xor 3,3,3
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#if 0 /* XXX */
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bl lcsplx
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#endif
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stw 3,PCB_SPL(31) /* save spl */
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/* Find a new process */
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bl chooseproc
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1:
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/* record new process */
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mfsprg 4,0
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stw 3,GD_CURTHREAD(4)
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cmpl 0,31,30 /* is it the same process? */
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beq switch_return
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or. 30,30,30 /* old process was exiting? */
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beq switch_exited
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mfsr 10,USER_SR /* save USER_SR for copyin/copyout */
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mfcr 11 /* save cr */
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mr 12,2 /* save r2 */
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stwu 1,-SFRAMELEN(1) /* still running on old stack */
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stmw 10,8(1)
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lwz 3,TD_ADDR(30)
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stw 1,PCB_SP(3) /* save SP */
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switch_exited:
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mfmsr 3
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andi. 3,3,~PSL_EE@l /* disable interrupts while
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actually switching */
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mtmsr 3
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/* indicate new pcb */
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lwz 4,TD_ADDR(31)
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mfsprg 5,0
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stw 4,GD_CURPCB(5)
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#if 0 /* XXX */
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/* save real pmap pointer for spill fill */
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lwz 5,PCB_PMR(4)
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lis 6,curpm@ha
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stwu 5,curpm@l(6)
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stwcx. 5,0,6 /* clear possible reservation */
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#endif
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addic. 5,5,64
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li 6,0
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mfsr 8,KERNEL_SR /* save kernel SR */
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1:
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addis 6,6,-0x10000000@ha /* set new procs segment registers */
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or. 6,6,6 /* This is done from the real
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address pmap */
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lwzu 7,-4(5) /* so we don't have to worry */
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mtsrin 7,6 /* about accessibility */
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bne 1b
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mtsr KERNEL_SR,8 /* restore kernel SR */
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isync
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lwz 1,PCB_SP(4) /* get new procs SP */
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ori 3,3,PSL_EE@l /* interrupts are okay again */
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mtmsr 3
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lmw 10,8(1) /* get other regs */
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lwz 1,0(1) /* get saved SP */
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mr 2,12 /* get saved r2 */
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mtcr 11 /* get saved cr */
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isync
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mtsr USER_SR,10 /* get saved USER_SR */
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isync
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switch_return:
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mr 30,7 /* save proc pointer */
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lwz 3,PCB_SPL(4)
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#if 0 /* XXX */
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bl lcsplx
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#endif
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mr 3,30 /* get curthread for special fork
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returns */
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lwz 31,12(1)
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lwz 30,8(1)
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addi 1,1,16
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lwz 0,4(1)
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mtlr 0
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blr
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/*
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* Fake savectx for the time being.
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*/
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ENTRY(savectx)
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blr
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