sanoslib.s

来自「三星 S3C2410 开发板 LCD测试配套程序」· S 代码 · 共 58 行

;; file: SanOSasmlib.s
;; by  : Sanicle
;; ver : 2005.03.20
;; from: http://3mn.net
	
   AREA    SanFuncs,CODE,READONLY

;;;;;;;;;; Fuctions

        EXPORT  SanSaveSR
SanSaveSR
        mrs r0,CPSR
        orr r1,r0,#0xc0
        msr CPSR_c,r1
        mov pc,lr


        EXPORT  SanRestoreSR
SanRestoreSR
        msr CPSR_c,r0
        mov pc,lr 
        
;==============
; CPSR I,F bit
;==============
;int SET_IF(void);
;The return value is current CPSR.
    EXPORT  SET_IF
SET_IF
    ;This function works only if the processor is in previliged mode.
   mrs  r0,cpsr
   mov  r1,r0
   orr  r1,r1,#0xc0
   msr  cpsr_cxsf,r1             
   mov pc,lr

;void WR_IF(int cpsrValue);
   EXPORT WR_IF
WR_IF   
    ;This function works only if the processor is in previliged mode.
   msr  cpsr_cxsf,r0             
   mov pc,lr


;void CLR_IF(void);
   EXPORT  CLR_IF
CLR_IF
    ;This function works only if the processor is in previliged mode.
   mrs  r0,cpsr
   bic  r0,r0,#0xc0
   msr  cpsr_cxsf,r0             
   mov pc,lr
	
        END