// "@(#) 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