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Diffstat (limited to 'private/ntos/nthals/halntp/mips/xxidle.s')
| -rw-r--r-- | private/ntos/nthals/halntp/mips/xxidle.s | 75 |
1 files changed, 75 insertions, 0 deletions
diff --git a/private/ntos/nthals/halntp/mips/xxidle.s b/private/ntos/nthals/halntp/mips/xxidle.s new file mode 100644 index 000000000..b577c862d --- /dev/null +++ b/private/ntos/nthals/halntp/mips/xxidle.s @@ -0,0 +1,75 @@ +// 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 |