diff options
Diffstat (limited to 'nuttx/arch/arm/src/common/up_cache.S')
-rw-r--r-- | nuttx/arch/arm/src/common/up_cache.S | 74 |
1 files changed, 74 insertions, 0 deletions
diff --git a/nuttx/arch/arm/src/common/up_cache.S b/nuttx/arch/arm/src/common/up_cache.S new file mode 100644 index 000000000..5e6f6610b --- /dev/null +++ b/nuttx/arch/arm/src/common/up_cache.S @@ -0,0 +1,74 @@ +/******************************************************************** + * common/up_cache.S + * + * Copyright (C) 2007 Gregory Nutt. All rights reserved. + * Author: Gregory Nutt <spudmonkey@racsa.co.cr> + * + * 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 Gregory Nutt nor the names of its 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 <nuttx/config.h> +#include "up_internal.h" +#include "up_arch.h" + +/******************************************************************** + * Definitions + ********************************************************************/ + +#define CACHE_DLINESIZE 32 + +/******************************************************************** + * Assembly Macros + ********************************************************************/ + +/************************************************************************** + * Name: up_flushicache + **************************************************************************/ + +/* Esure coherency between the Icache and the Dcache in the region described + * by r0=start and r1=end. + */ + .globl up_flushicache + .type up_flushicache,%function +up_flushicache: + bic r0, r0, #CACHE_DLINESIZE - 1 +1: mcr p15, 0, r0, c7, c10, 1 /* Clean D entry */ + mcr p15, 0, r0, c7, c5, 1 /* Invalidate I entry */ + add r0, r0, #CACHE_DLINESIZE + cmp r0, r1 + blo 1b + mcr p15, 0, r0, c7, c10, 4 /* Drain WB */ + mov pc, lr + .size up_flushicache, .-up_flushicache + .end + |