mmucache_asm.s

sansumg s3c2443 bootload 的源码

;=========================================
; NAME: 2443MMUCache_asm.S
; DESC: Assembler Library Regarding 
;       MMU, Cacche, and CPSR 
; HISTORY:
; 2003.03.31 : ver 0.0
;=========================================

	GET		Option.inc

;Interrupt, FIQ/IRQ disable
NOINT   EQU     0xc0    ;1100 0000  

;Check if tasm.exe(armasm -16 ...@ADS 1.0) is used.
   GBLL    THUMBCODE
   [ {CONFIG} = 16
THUMBCODE SETL  {TRUE}
	 CODE32
   |
THUMBCODE SETL  {FALSE}
   ]

   MACRO
     MOV_PC_LR
     [ THUMBCODE
       bx lr
     |
       mov pc,lr
     ]
   MEND


   AREA |C$$code|, CODE, READONLY
   
;====================================
; MMU Cache/TLB/etc on/off functions
;====================================
R1_I	EQU	(1<<12)
R1_C	EQU	(1<<2)
R1_A	EQU	(1<<1)
R1_M    EQU	(1)
R1_iA	EQU	(1<<31)
R1_nF   EQU	(1<<30)

;void MMU_EnableICache(void)
   EXPORT MMU_EnableICache
MMU_EnableICache
   mrc p15,0,r0,c1,c0,0
   orr r0,r0,#R1_I
   mcr p15,0,r0,c1,c0,0
   MOV_PC_LR

;void MMU_DisableICache(void)
   EXPORT MMU_DisableICache
MMU_DisableICache
   mrc p15,0,r0,c1,c0,0
   bic r0,r0,#R1_I
   mcr p15,0,r0,c1,c0,0
   MOV_PC_LR

;void MMU_EnableDCache(void)
   EXPORT MMU_EnableDCache
MMU_EnableDCache
   mrc p15,0,r0,c1,c0,0
   orr r0,r0,#R1_C
   mcr p15,0,r0,c1,c0,0
   MOV_PC_LR

;void MMU_DisableDCache(void)
   EXPORT MMU_DisableDCache
MMU_DisableDCache
   mrc p15,0,r0,c1,c0,0
   bic r0,r0,#R1_C
   mcr p15,0,r0,c1,c0,0
   MOV_PC_LR

;void MMU_SetFastBusMode(void)
; FCLK:HCLK= 1:1
  EXPORT MMU_SetFastBusMode
MMU_SetFastBusMode
   mrc p15,0,r0,c1,c0,0
   bic r0,r0,#R1_iA:OR:R1_nF
   mcr p15,0,r0,c1,c0,0
   MOV_PC_LR

;void MMU_SetAsyncBusMode(void)
; FCLK:HCLK= 1:2
   EXPORT MMU_SetAsyncBusMode
MMU_SetAsyncBusMode
   mrc p15,0,r0,c1,c0,0
   orr r0,r0,#R1_nF:OR:R1_iA
   mcr p15,0,r0,c1,c0,0
   MOV_PC_LR

	LTORG

	END