cpurdwr.asm

来自「X86 GX1 BOOTLOAD代码 ,支持WINCE操作系统!」· 汇编 代码 · 共 67 行

;**************************************************************************
;*
;*  CPURDWR.ASM
;*
;*  Copyright (c) 1999-2000 National Semiconductor Corporation.
;*  All Rights Reserved.
;*
;*  Function:
;*    Register read and write routines for the CPU.
;*
;*  $Revision:: 1   $
;*
;**************************************************************************

	;.MODEL TINY
	.486P

	INCLUDE DEF.INC
	INCLUDE MACROS.INC
	INCLUDE PORT80.INC


_TEXT SEGMENT PUBLIC use16 'CODE'

;**************************************************************************
;*
;*	CpuRegRead
;*
;*	Entry:
;*	  AL = register offset
;*
;*	Exit:
;*	  AL = register read
;*
;*	Destroys: 
;*
;**************************************************************************
CpuRegRead PROC
	out	CPU_INDEX, al
	in	al, CPU_DATA
	jmp	bx
CpuRegRead ENDP

;**************************************************************************
;*
;*	CpuRegWrite
;*
;*	Entry:
;*	  AL = register offset
;*	  DL = data
;*
;*	Exit:
;*
;*	Destroys: 
;*
;**************************************************************************
CpuRegWrite PROC
	out	CPU_INDEX, al
	mov	al, dl
	out	CPU_DATA, al
	jmp 	bx
CpuRegWrite ENDP

_TEXT ENDS

END