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author | Haavard Skinnemoen <hskinnemoen@atmel.com> | 2007-12-13 11:56:33 (GMT) |
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committer | Stefan Roese <sr@denx.de> | 2007-12-13 12:15:16 (GMT) |
commit | 4d7d6936eb29af7cca330937808312aa5f61454d (patch) | |
tree | b376f7dce492d171cf6740ac4ec36574e94eec1e /include/asm-i386 | |
parent | cdbaefb5f5f03e54455d0439dcf6dbd97ead1f9d (diff) | |
download | u-boot-4d7d6936eb29af7cca330937808312aa5f61454d.tar.xz |
Introduce map_physmem() and unmap_physmem()
map_physmem() returns a virtual address which can be used to access a
given physical address without involving the cache. unmap_physmem()
should be called when the virtual address returned by map_physmem() is
no longer needed.
This patch adds a stub implementation which simply returns the
physical address cast to a uchar * for all architectures except AVR32,
which converts the physical address to an uncached virtual mapping.
unmap_physmem() is a no-op on all architectures, but if any
architecture needs to do such mappings through the TLB, this is the
hook where those TLB entries can be invalidated.
Signed-off-by: Haavard Skinnemoen <hskinnemoen@atmel.com>
Diffstat (limited to 'include/asm-i386')
-rw-r--r-- | include/asm-i386/io.h | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/include/asm-i386/io.h b/include/asm-i386/io.h index e64d788..db4f442 100644 --- a/include/asm-i386/io.h +++ b/include/asm-i386/io.h @@ -205,4 +205,30 @@ static inline void sync(void) { } +/* + * Given a physical address and a length, return a virtual address + * that can be used to access the memory range with the caching + * properties specified by "flags". + */ +typedef unsigned long phys_addr_t; + +#define MAP_NOCACHE (0) +#define MAP_WRCOMBINE (0) +#define MAP_WRBACK (0) +#define MAP_WRTHROUGH (0) + +static inline void * +map_physmem(phys_addr_t paddr, unsigned long len, unsigned long flags) +{ + return (void *)paddr; +} + +/* + * Take down a mapping set up by map_physmem(). + */ +static inline void unmap_physmem(void *vaddr, unsigned long flags) +{ + +} + #endif |