flushiclines.s

ARM9基于WINDOWSCE的BSP源代码

;
; Copyright (c) Microsoft Corporation.  All rights reserved.
;
;
; Use of this source code is subject to the terms of the Microsoft end-user
; license agreement (EULA) under which you licensed this SOFTWARE PRODUCT.
; If you did not accept the terms of the EULA, you are not authorized to use
; this source code. For a copy of the EULA, please see the LICENSE.RTF on your
; install media.
;
; Copyright (c) 1998, 1999 ARM Limited
; All Rights Reserved
;

    OPT     2       ; disable listing
    INCLUDE kxarm.h
    OPT     1       ; reenable listing
    OPT     128     ; disable listing of macro expansions
    INCLUDE armmacros.s

    TEXTAREA

    LEAF_ENTRY	ARMFlushICacheLines
;++
; Routine Description:
;    Invalidate some number of Instruction Cache lines
;
; Syntax:
;	void ARMFlushICacheLines(PVOID pAddr, DWORD dwLength, DWORD dwLineLength);
;
; Arguments:
;	pAddr -- virtual address at which to start invalidation, on dwLineLength-byte 
;            alignment
;	dwLength -- number of bytes to invalidate, must be > zero
;   dwLineLength -- number of bytes in a cache line
;
; Return Value:
;	-- none --
; r0..r2 junk
; CC flags junk	
;--

    ; invalidate the range of lines
10
    mcr 	p15, 0, r0, c7, c5, 1   ; invalidate each entry
    add     r0, r0, r2              ; on to the next line
    subs	r1, r1, r2              ; reduce the number of bytes left
    bgt     %b10                    ; loop while > 0 bytes left

    RETURN

    END