pre338.asm

X86 GX1 BOOTLOAD代码 ,支持WINCE操作系统!

;**************************************************************************
;*
;*  PRE338.ASM
;*
;*  Copyright (c) 1999 National Semiconductor Corporation.
;*  All Rights Reserved.
;*
;*  Function:
;*    Code to be run before NS 338 SuperIO initialization.
;*
;*  $Revision:: 1   $
;*
;**************************************************************************
	;.MODEL TINY
	.486P

	INCLUDE DEF.INC
	INCLUDE MACROS.INC
	INCLUDE PORT80.INC
	INCLUDE 5530.inc
	INCLUDE strings.inc

_TEXT SEGMENT PUBLIC use16 'CODE'

	EXTERN	cy55x0RegRead8:NEAR
	EXTERN	cy55x0RegWrite8:NEAR
	EXTERN	cy55x0RegRead32:NEAR
	EXTERN	cy55x0RegWrite32:NEAR

NS_INIT_TABLE:
	DB	  00h, 0FFh		; enable all devices

NS_INIT_COUNT EQU ($ - NS_INIT_TABLE)

;**************************************************************************
;*
;*	preSioInit
;*
;*	Entry:
;*	Exit:
;*	Destroys:
;*
;**************************************************************************
preSioInit PROC NEAR PUBLIC
		  	
	mov	gs, bx
	
	PORT80	P80_SIO			; Indicate Entrance to SIO code

ns317_base	equ	0398h
;gpio_base	equ	0E0h
gpio_base	equ	0E8h
;pm_base	equ	0E8h
pm_base		equ	0E0h

	mov	dx, ns317_base
	in	al, dx
	in	al, dx
	in	al, dx
	in	al, dx
	
	mov	cx, NS_INIT_COUNT
	lea	si, NS_INIT_TABLE
	mov	dx, ns317_base
nsloop:
	mov	al, cs:[si]
	inc	si
	out	dx, al
	out	dx, al
	xor	dl,1
	loop nsloop

	mov	al,03h			; pmc2
	out	pm_base,al
	xchg	al,ah
	in	al,pm_base+1		; read it
	or	al,07h			; mask it
	xchg	al,ah
	out	pm_base,al
	xchg	al,ah
	out	pm_base+1,al		; out it 

	mov	dx,ns317_base		; ns317
	mov	al,07h
	out	dx,al
	inc	dx
	mov	al,08h
	out	dx,al

	mov	dx,ns317_base		; ns317
	mov	al,30h
	out	dx,al
	mov	al,0
	inc	dx
	out	dx,al

	;CONFIG GPIO 16 TO BE A LOW OUTPUT
	in	al,gpio_base+1
	or	al,40h			; make it an out
	out	gpio_base+1,al
	in	al,gpio_base
	and	al,0BFh			; make it low
	out	gpio_base,al

;
; Set KBC and RTC to ISA SD bus to enable KBC and RTC decode.
;
	mov	eax, CX55x0_ID
	mov	al, CX5530_REG58
	NOSTACK	bx, Cy55x0RegRead8
	mov	eax, CX55x0_ID
	mov	al, CX5530_REG58
	or	dl, 03h
	NOSTACK	bx, Cy55x0RegWrite8

	mov	bx, gs
	jmp	bx

preSioInit ENDP

_TEXT ENDS

	END