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NetBSD/sys/arch/hpcmips/vr/vr_idle.S

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Move UCB-licensed code from 4-clause to 3-clause licence. Patches provided by Joel Baker in PR 22364, verified by myself.
2003-08-07 20:26:28 +04:00
/* $NetBSD: vr_idle.S,v 1.8 2003/08/07 16:27:50 agc Exp $ */
CPU specific idle hook and VR idle routine.
2000-01-28 18:08:36 +03:00
/*
* Copyright (c) 1992, 1993
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Digital Equipment Corporation and Ralph Campbell.
*
* 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.
Move UCB-licensed code from 4-clause to 3-clause licence. Patches provided by Joel Baker in PR 22364, verified by myself.
2003-08-07 20:26:28 +04:00
* 3. Neither the name of the University nor the names of its contributors
CPU specific idle hook and VR idle routine.
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* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``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 THE REGENTS OR CONTRIBUTORS 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) 1989 Digital Equipment Corporation.
* Permission to use, copy, modify, and distribute this software and
* its documentation for any purpose and without fee is hereby granted,
* provided that the above copyright notice appears in all copies.
* Digital Equipment Corporation makes no representations about the
* suitability of this software for any purpose. It is provided "as is"
* without express or implied warranty.
*
*/
#include <mips/asm.h>
#include <mips/cpuregs.h>
#include <hpcmips/vr/vr_asm.h>
Add a lock around the scheduler, and use it as necessary, including in the non-MULTIPROCESSOR case (LOCKDEBUG requires it). Scheduler lock is held upon entry to mi_switch() and cpu_switch(), and cpu_switch() releases the lock before returning. Largely from Bill Sommerfeld, with some minor bug fixes and machine-dependent code hacking from me.
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#include "opt_lockdebug.h"
CPU specific idle hook and VR idle routine.
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#include "assym.h"
.set noreorder
/*
* When no processes are on the runq, cpu_switch branches to idle
* to wait for something to come ready.
* Note: this is really a part of cpu_switch() but defined here for kernel
* profiling.
*/
LEAF(vr_idle)
li t0, (MIPS_INT_MASK | MIPS_SR_INT_IE)
mtc0 t0, MIPS_COP_0_STATUS # enable all interrupts
nop
Merge the nathanw_sa branch.
2003-01-18 01:58:53 +03:00
sw zero, _C_LABEL(curlwp) # set curlwp NULL for stats
Add a lock around the scheduler, and use it as necessary, including in the non-MULTIPROCESSOR case (LOCKDEBUG requires it). Scheduler lock is held upon entry to mi_switch() and cpu_switch(), and cpu_switch() releases the lock before returning. Largely from Bill Sommerfeld, with some minor bug fixes and machine-dependent code hacking from me.
2000-08-21 01:50:06 +04:00
#if defined(LOCKDEBUG)
jal _C_LABEL(sched_unlock_idle) # release sched_lock
nop
#endif
call uvm_pageidlezero() while CPU is idle.
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/* Try to zero some free pages. */
lw t0, _C_LABEL(uvm) + UVM_PAGE_IDLE_ZERO
nop
beq t0, zero, 1f
nop
jal _C_LABEL(uvm_pageidlezero)
nop
CPU specific idle hook and VR idle routine.
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1:
First sweep at scheduler state cleanup. Collect MI scheduler state into global and per-CPU scheduler state: - Global state: sched_qs (run queues), sched_whichqs (bitmap of non-empty run queues), sched_slpque (sleep queues). NOTE: These may collectively move into a struct schedstate at some point in the future. - Per-CPU state, struct schedstate_percpu: spc_runtime (time process on this CPU started running), spc_flags (replaces struct proc's p_schedflags), and spc_curpriority (usrpri of processes on this CPU). - Every platform must now supply a struct cpu_info and a curcpu() macro. Simplify existing cpu_info declarations where appropriate. - All references to per-CPU scheduler state now made through curcpu(). NOTE: this will likely be adjusted in the future after further changes to struct proc are made. Tested on i386 and Alpha. Changes are mostly mechanical, but apologies in advance if it doesn't compile on a particular platform.
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lw t0, _C_LABEL(sched_whichqs) # look for non-empty queue
CPU specific idle hook and VR idle routine.
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bne t0, zero, 1f
nop
.word VR_OPCODE_STANDBY
nop
nop
nop
nop
beq t0, zero, 1b
nop
1:
Add a lock around the scheduler, and use it as necessary, including in the non-MULTIPROCESSOR case (LOCKDEBUG requires it). Scheduler lock is held upon entry to mi_switch() and cpu_switch(), and cpu_switch() releases the lock before returning. Largely from Bill Sommerfeld, with some minor bug fixes and machine-dependent code hacking from me.
2000-08-21 01:50:06 +04:00
#if defined(LOCKDEBUG)
mtc0 zero, MIPS_COP_0_STATUS # disable all interrupts
nop
nop
nop
nop
jal _C_LABEL(sched_lock_idle) # acquire sched_lock
nop
Change 'goto cpu_switch1' to 'goto cpu_switch_queuescan' in vr_idle.S and make the jump destination global.
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la ra, cpu_switch_queuescan # rathole to cpu_switch()
CPU specific idle hook and VR idle routine.
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j ra
Add a lock around the scheduler, and use it as necessary, including in the non-MULTIPROCESSOR case (LOCKDEBUG requires it). Scheduler lock is held upon entry to mi_switch() and cpu_switch(), and cpu_switch() releases the lock before returning. Largely from Bill Sommerfeld, with some minor bug fixes and machine-dependent code hacking from me.
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nop
#else
CPU specific idle hook and VR idle routine.
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mtc0 zero, MIPS_COP_0_STATUS # disable all interrupts
Add a lock around the scheduler, and use it as necessary, including in the non-MULTIPROCESSOR case (LOCKDEBUG requires it). Scheduler lock is held upon entry to mi_switch() and cpu_switch(), and cpu_switch() releases the lock before returning. Largely from Bill Sommerfeld, with some minor bug fixes and machine-dependent code hacking from me.
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nop
nop
nop
la ra, cpu_switch_queuescan # rathole to cpu_switch()
j ra
nop
#endif
CPU specific idle hook and VR idle routine.
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END(vr_idle)