From cd6b22f9a02a7e21b39cc8a68d7ceb2f90a0815b Mon Sep 17 00:00:00 2001 From: Julius Werner Date: Mon, 17 Apr 2017 18:16:39 -0700 Subject: arch: Unify basic cache clearing API MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Caching is a very architecture-specific thing, but most architectures have a cache in general. Therefore it can be useful to have a generic architecture-independent API to perform simple cache management tasks from common code. We have already standardized on the dcache_clean/invalidate naming scheme that originally comes from ARM in libpayload, so let's just do the same for coreboot. Unlike libpayload, there are other things than just DMA coherency we may want to achieve with those functions, so actually implement them for real even on architectures with cache-snooping DMA like x86. (In the future, we may find applications like this in libpayload as well and should probably rethink the API there... maybe move the current functionality to a separate dma_map/unmap API instead. But that's beyond scope of this patch.) Change-Id: I2c1723a287f76cd4118ef38a445339840601aeea Signed-off-by: Julius Werner Reviewed-on: https://review.coreboot.org/19788 Tested-by: build bot (Jenkins) Reviewed-by: Aaron Durbin Reviewed-by: Philippe Mathieu-Daudé --- src/arch/power8/include/arch/cache.h | 40 ++++++++++++++++++++++++++++++++++++ 1 file changed, 40 insertions(+) create mode 100644 src/arch/power8/include/arch/cache.h (limited to 'src/arch/power8') diff --git a/src/arch/power8/include/arch/cache.h b/src/arch/power8/include/arch/cache.h new file mode 100644 index 0000000000..9b91ac2164 --- /dev/null +++ b/src/arch/power8/include/arch/cache.h @@ -0,0 +1,40 @@ +/* + * This file is part of the coreboot project. + * + * Copyright 2017 Google Inc. + * + * 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. The name of the author may not be used to endorse or promote products + * derived from this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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. + * + */ + +#ifndef ARCH_CACHE_H +#define ARCH_CACHE_H + +/* TODO: implement these API stubs once caching is available on Power 8 */ +static inline void cache_sync_instructions(void) {} +static inline void dcache_clean_all(void) {} +static inline void dcache_invalidate_all(void) {} +static inline void dcache_clean_invalidate_all(void) {} + +#endif /* ARCH_CACHE_H */ -- cgit v1.2.3