44blib_a.s

来自「S3C44b0X 的中断程序代码................」· S 代码 · 共 31 行

;44BMON : 44blib_a.s
; ************************************************** *
; * NAME : assembly function library *
; * Version : 07.JUL.2000 *
; ************************************************** *
	AREA |C$$code|, CODE, READONLY
	EXPORT ChangeMemCon
;void ChangeMemCon();
ChangeMemCon
	stmfd sp!,{r4-r9} ;Assembler uses the high registers(r4~).
	ldmia r0,{r1-r9}
	ldr r0,=0x01c80004 ;BANKCON0 Address
	stmia r0,{r1-r9}
	ldmfd sp!,{r4-r9}
	mov pc,lr
	EXPORT DisableInterrupt
DisableInterrupt
;This function works only if the processor is in previliged mode.
NOINT EQU 0xc0
	mrs r0,cpsr
	orr r0,r0,#NOINT
	msr cpsr_cxsf,r0
	mov pc,lr
	EXPORT EnableInterrupt
EnableInterrupt
;This function works only if the processor is in previliged mode.
	mrs r0,cpsr
	bic r0,r0,#NOINT
	msr cpsr_cxsf,r0
	mov pc,lr
	END