flushdc.src

WinCE5.0BSP for Renesas SH7770

;
;  Copyright(C) Renesas Technology Corp. 2004. All rights reserved.
;
;  generic cache routines for ITS-DS7 Ver.0.8.0
;
;  FILE      : flushdc.src
;  CREATED   : 2004.09.01
;  MODIFIED  : 
;  AUTHOR    : Renesas Technology Corp.
;  HARDWARE  : RENESAS ITS-DS7
;  HISTORY   : 
;              2004.09.01
;              - Created release code.
;                (based on ASPEN for WCE5.0)
;

;
; 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.
;

	.include "kxshx.h"
	.include "shx.inc"

    .align 4
    .import _SH4CacheLines

;

;++
; Routine Description:
;    Flush and invalidate the entire data cache
;
; Syntax:
;	void SH4FlushDCache(DWORD dwCacheLines);
;
; Arguments:
;	dwCacheLines -- number of lines in the data cache
;
; Return Value:
;	-- none --
;--
    LEAF_ENTRY _SH4FlushDCache
    
    mov     r4, r2
    shlr2   r2                      ; (r2) = # of cache entries / 4
    mov     #h'F4000000, r1         ; (r1) = ptr to memory mapped cache
    mov     #0, r0                  ; (r0) = 0 for clearing cache tags

    ; Flush & validate all cache lines.
    ;       (r0) = 0
    ;       (r1) = ptr to memory mapped cache address array
    ;       (r2) = # of cache entries / 4
    ;       (r4) = original SR
fc10:
    mov     r0, @r1                 ; invalidate 4 cache lines at a time
    mov     r0, @(32,r1)
    add     #64, r1
    mov     r0, @r1                 ; invalidate 4 cache lines at a time
    mov     r0, @(32,r1)
    dt      r2                      ; (r2) = # of entries remaining
    bf/s    fc10
    add     #64, r1                 ; (r1) = ptr to next set of 4 entries

    rts
    nop
    .endf

    .end