110 lines
3.4 KiB
ArmAsm
110 lines
3.4 KiB
ArmAsm
/* $NetBSD: vr_idle.S,v 1.8 2003/08/07 16:27:50 agc Exp $ */
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/*
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* Copyright (c) 1992, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Digital Equipment Corporation and Ralph Campbell.
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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. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* Copyright (C) 1989 Digital Equipment Corporation.
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* Permission to use, copy, modify, and distribute this software and
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* its documentation for any purpose and without fee is hereby granted,
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* provided that the above copyright notice appears in all copies.
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* Digital Equipment Corporation makes no representations about the
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* suitability of this software for any purpose. It is provided "as is"
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* without express or implied warranty.
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*
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*/
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#include <mips/asm.h>
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#include <mips/cpuregs.h>
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#include <hpcmips/vr/vr_asm.h>
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#include "opt_lockdebug.h"
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#include "assym.h"
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.set noreorder
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/*
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* When no processes are on the runq, cpu_switch branches to idle
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* to wait for something to come ready.
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* Note: this is really a part of cpu_switch() but defined here for kernel
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* profiling.
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*/
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LEAF(vr_idle)
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li t0, (MIPS_INT_MASK | MIPS_SR_INT_IE)
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mtc0 t0, MIPS_COP_0_STATUS # enable all interrupts
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nop
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sw zero, _C_LABEL(curlwp) # set curlwp NULL for stats
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#if defined(LOCKDEBUG)
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jal _C_LABEL(sched_unlock_idle) # release sched_lock
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nop
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#endif
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/* Try to zero some free pages. */
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lw t0, _C_LABEL(uvm) + UVM_PAGE_IDLE_ZERO
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nop
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beq t0, zero, 1f
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nop
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jal _C_LABEL(uvm_pageidlezero)
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nop
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1:
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lw t0, _C_LABEL(sched_whichqs) # look for non-empty queue
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bne t0, zero, 1f
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nop
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.word VR_OPCODE_STANDBY
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nop
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nop
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nop
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nop
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beq t0, zero, 1b
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nop
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1:
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#if defined(LOCKDEBUG)
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mtc0 zero, MIPS_COP_0_STATUS # disable all interrupts
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nop
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nop
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nop
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nop
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jal _C_LABEL(sched_lock_idle) # acquire sched_lock
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nop
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la ra, cpu_switch_queuescan # rathole to cpu_switch()
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j ra
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nop
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#else
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mtc0 zero, MIPS_COP_0_STATUS # disable all interrupts
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nop
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nop
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nop
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la ra, cpu_switch_queuescan # rathole to cpu_switch()
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j ra
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nop
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#endif
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END(vr_idle)
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