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