Leaked source code of windows server 2003
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title "Hal Processor Idle" ;++ ; ;Copyright (c) 1991 Microsoft Corporation ; ;Module Name: ; ; ixidle.asm ; ;Abstract: ; ; ;Author: ; ; ;Revision History: ; ;--
.386p .xlist include hal386.inc include callconv.inc ; calling convention macros include i386\kimacro.inc include mac386.inc .list
_TEXT$01 SEGMENT DWORD PUBLIC 'CODE' ASSUME DS:FLAT, ES:FLAT, SS:NOTHING, FS:NOTHING, GS:NOTHING
page ,132 subttl "HalProcessorIdle" ;++ ; ; VOID ; HalProcessorIdle( ; VOID ; ) ; ; Routine Description: ; ; This function is called when the current processor is idle. ; ; This function is called with interrupts disabled, and the processor ; is idle until it receives an interrupt. The does not need to return ; until an interrupt is received by the current processor. ; ; This is the lowest level of processor idle. It occurs frequently, ; and this function (alone) should not put the processor into a ; power savings mode which requeres large amount of time to enter & exit. ; ; Return Value: ; ;--
cPublicProc _HalProcessorIdle, 0 cPublicFpo 0,0
; ; the following code sequence "sti-halt" puts the processor ; into a Halted state, with interrupts enabled, without processing ; an interrupt before halting. The STI instruction has a delay ; slot such that it does not take effect until after the instruction ; following it - this has the effect of HALTing without allowing ; a possible interrupt and then enabling interrupts while HALTed. ;
; ; On an MP hal we don't stop the processor, since that causes ; the SNOOP to slow down as well ;
sti
ifdef NT_UP hlt endif
; ; Now return to the system. If there's still no work, then it ; will call us back to halt again. ;
stdRET _HalProcessorIdle
stdENDP _HalProcessorIdle
_TEXT$01 ends end
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