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/****************************************************************************
* arch/arm/src/armv7-a/cp15_invalidate_dcache.S
*
* Copyright (C) 2013 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
*
* References:
*
* "Cortex-A5� MPCore, Technical Reference Manual", Revision: r0p1,
* Copyright � 2010 ARM. All rights reserved. ARM DDI 0434B (ID101810)
* "ARM� Architecture Reference Manual, ARMv7-A and ARMv7-R edition",
* Copyright � 1996-1998, 2000, 2004-2012 ARM. All rights reserved. ARM
* DDI 0406C.b (ID072512)
*
* Portions of this file derive from Atmel sample code for the SAMA5D3 Cortex-A5
* which also has a modified BSD-style license:
*
* Copyright (c) 2012, Atmel Corporation
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* 3. Neither the name NuttX nor Atmel nor the names of the contributors may
* be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include "cp15.h"
.file "cp15_invalidate_dcache.S"
/****************************************************************************
* Preprocessor Definitions
****************************************************************************/
/****************************************************************************
* Public Symbols
****************************************************************************/
.globl cp15_invalidate_dcache
/****************************************************************************
* Public Functions
****************************************************************************/
.text
/****************************************************************************
* Name: cp15_invalidate_dcache
*
* Description:
* Invalidate the data cache within the specified region; we will be
* performing a DMA operation in this region and we want to purge old data
* in the cache.
*
* Input Parameters:
* start - virtual start address of region
* end - virtual end address of region + 1
*
* Returned Value:
* None
*
****************************************************************************/
.globl cp15_invalidate_dcache
.type cp15_invalidate_dcache, function
cp15_invalidate_dcache:
mrc CP15_TR(r3) /* Read the Cache Type Register */
lsr r3, r3, #16 /* Isolate the DMinLine field */
and r3, r3, #0xf
mov r2, #4
mov r2, r2, lsl r3 /* Get the cache line size in bytes */
sub r3, r2, #1 /* R3=Cache line size mask */
tst r0, r3
bic r0, r0, r3 /* R0=aligned start address */
mcrne CP15_DCCIMVAC(r0) /* Clean and invalidate data cache line by VA to PoC */
tst r1, r3
bic r1, r1, r3 /* R0=aligned end address */
mcrne CP15_DCCIMVAC(r1) /* Clean and invalidate data cache line by VA to PoC */
/* Loop, invalidating each D cache line */
1:
mcr CP15_DCIMVAC(r0) /* Invalidate data cache line by VA to PoC */
add r0, r0, r2 /* R12=Next cache line */
cmp r0, r1 /* Loop until all cache lines have been invalidate */
blo 1b
dsb
bx lr
.size cp15_invalidate_dcache, . - cp15_invalidate_dcache
.end
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