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// "@(#) NEC xxidle.s 1.2 94/10/17 11:59:42"
// TITLE("Processor Idle")
//++
//
// Copyright (c) 1994 Microsoft Corporation
//
// Module Name:
//
// xxidle.s
//
// Abstract:
//
// This module implements system platform dependent power management
// support.
//
// Environment:
//
// Kernel mode only.
//
// Revision History:
//
//--
#include "halmips.h"
SBTTL("Processor Idle")
//++
//
// VOID
// HalProcessorIdle(
// VOID
// )
//
// Routine Description:
//
// This function is called when the current processor is idle with
// interrupts disabled. There is no thread active and there are no
// DPCs to process. Therefore, power can be switched to a standby
// mode until the the next interrupt occurs on the current processor.
//
// N.B. This routine is entered with IE in PSR clear. This routine
// must do any power management enabling necessary, set the IE
// bit in PSR, then either return or wait for an interrupt.
//
// Arguments:
//
// None.
//
// Return Value:
//
// None.
//
//--
LEAF_ENTRY(HalProcessorIdle)
//
// Perform power management enabling.
//
.set noreorder
.set noat
mfc0 v0,psr // get current PSR
nop // fill
or v0,v0,1 << PSR_IE // set interrupt enable.
mtc0 v0,psr // enable interrupts
.set at
.set reorder
//
// Wait for an interrupt if supported.
//
j ra // return
.end HalProcessorIdle
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