p6access.mac

<BIOS研发技术剖析>书的源代码,包括完整的BIOS汇编语言源程序.

;*****************************************************************;
;*****************************************************************;
;**								**;
;**	(C)Copyright 1985-1995, American Megatrends Inc.	**;
;**								**;
;**			All Rights Reserved.			**;
;**								**;
;**		6145-F, Northbelt Parkway, Norcross,		**;
;**								**;
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;**								**;
;*****************************************************************;
;*****************************************************************;
;Contains Macros for accessing P6 Registers.
	.586p
;------------------------------------------------------------------------
;ReadMSR Macro follows. This macro allows us to read an MSR (Machine
;specific register) of P6 CPU.

;I/P = Index Value Of The MSR Being Read.
;O/P = Data from the 64 bit MSR in EDX:EAX
;Destroys EAX,EDX and ECX registers. Stack Usage = None.
;MSR index will be sanity checked for validity when enough info
;is available.
;------------------------------------------------------------------------
ReadMSR		Macro	MSRIndex

	Mov	ecx,MSRIndex
	RDMSR
;;	Db	0fh,32h		;That is RDMSR that MASM does not know.

EndM
;-------------------------------------------------------------------------
;WriteMSR Macro follows. This macro allows us to write an MSR (Machine
;specific register) of P6 CPU.

;I/P = Index Value Of The MSR Being Read.
;I/P = Low32BitData and High32BitData dwords in hex.
;O/P = 64 bit MSR is written with the value specified.
;Destroys EAX,EDX and ECX registers. Stack Usage = None.
;MSR index will be sanity checked for validity when enough info
;is available.
;------------------------------------------------------------------
WriteMSR	Macro	MSRIndex,Low32bitData,High32BitData

	Mov	ecx,MSRIndex
	Mov	edx,High32BitData
	Mov	eax,Low32bitData
	WRMSR
;;	Db	0fh,30h		;That is WRMSR that MASM does not know.

EndM
;-------------------------------------------------------------------------
;ChangeMSR Macro follows. This macro allows us to change bits of an MSR
;(Machine specific register) of P6 CPU.

;I/P = Index Value Of The MSR Being Read.
;I/P = Low32BitANDPattern and High32BitANDPattern dwords in hex.
;I/P = Low32BitORPattern and High32BitORPattern dwords in hex.

;O/P = 64 bit MSR bits are changed as specified.

;Destroys EAX,EDX and ECX registers. Stack Usage = None.
;--------------------------------------------------------------------------
ChangeMSR	Macro	MSRIndex,Low32BitANDPattern,High32BitANDPattern,Low32BitORPattern,High32BitORPattern

	ReadMSR		MSRIndex	;o/p in edx:eax.

	And	eax,Low32BitANDPattern
	Or	eax,Low32BitORPattern

	And	edx,High32BitANDPattern
	Or	edx,High32BitORPattern

	WRMSR
;;	Db	0fh,30h		;That is WRMSR that MASM does not know.

EndM
;---------------------------------------------------------------------------
	.286p
;*****************************************************************;
;*****************************************************************;
;**								**;
;**	(C)Copyright 1985-1995, American Megatrends Inc.	**;
;**								**;
;**			All Rights Reserved.			**;
;**								**;
;**		6145-F, Northbelt Parkway, Norcross,		**;
;**								**;
;**		Georgia - 30071, USA. Phone-(404)-263-8181.	**;
;**								**;
;*****************************************************************;
;*****************************************************************;