cleancachebytest.s

ARM嵌入式系统开发--软件设计与优化随书源代码。开发环境asm+c

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;// Copyright (c) 2003, Andrew N. Sloss, Dominic Symes, Chris Wright
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;/*
; * Example 12.4

; */ 

;------------------------------------------------------------------------
; clean or clean-and-flush cache using test loop
;----------------------------------------------------------------
; C-prototype
; void  cleanDCache(void);                /* clean all Dcache */
; void  cleanFlushDCache(void);           /* clean & flush all Dcache */
; void  cleanFlushCache(void);            /* clean & flush Dcache by way */
;------------------------------------------------------------------------
        AREA cleancachebytest , CODE, READONLY ; Start of Area block

        IF  {CPU} = "ARM926EJ-S" :LOR: {CPU} = "ARM1026EJ-S"
          EXPORT cleanDCache
          EXPORT cleanFlushDCache
          EXPORT cleanFlushCache

;reg15     RN  5   ; program counter

cleanDCache
          MRC     p15, 0, pc, c7, c10, 3   ; test/clean D-cline
          SUBNE   pc, pc, #12
          MOV     pc, lr
cleanFlushDCache
          MRC     p15, 0, pc, c7, c14, 3   ; test/cleanflush D-cline
          BNE     cleanFlushDCache
          MOV     pc, lr
cleanFlushCache
          MRC     p15, 0, pc, c7, c14, 3   ; test/cleanflush D-cline
          BNE     cleanFlushCache
          MCR     p15, 0, r0, c7, c5, 0    ; flush I-cache
          MOV     pc, lr
        ENDIF
        END