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| author | Deepak Saxena <dsaxena@plexity.net> | 2006-01-09 19:23:11 +0000 |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2006-01-09 19:23:11 +0000 |
| commit | 9d4ae7276ae26c5bfba6207cf05340af1931d8d4 (patch) | |
| tree | bf6f09189541ac964365c68362e9915c48510eb5 /include/asm-arm/memory.h | |
| parent | 16ed926eee5497db52fbee4d2db2dedbcd23561c (diff) | |
| download | lwn-9d4ae7276ae26c5bfba6207cf05340af1931d8d4.tar.gz lwn-9d4ae7276ae26c5bfba6207cf05340af1931d8d4.zip | |
[ARM] 3070/2: Add __ioremap_pfn() API
Patch from Deepak Saxena
In working on adding 36-bit addressed supersection support to ioremap(),
I came to the conclusion that it would be far simpler to do so by just
splitting __ioremap() into a main external interface and adding an
__ioremap_pfn() function that takes a pfn + offset into the page that
__ioremap() can call. This way existing callers of __ioremap() won't have
to change their code and 36-bit systems will just call __ioremap_pfn()
and we will not have to deal with unsigned long long variables.
Note that __ioremap_pfn() should _NOT_ be called directly by drivers
but is reserved for use by arch_ioremap() implementations that map
32-bit resource regions into the real 36-bit address and then call
this new function.
Signed-off-by: Deepak Saxena <dsaxena@plexity.net>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'include/asm-arm/memory.h')
| -rw-r--r-- | include/asm-arm/memory.h | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/include/asm-arm/memory.h b/include/asm-arm/memory.h index 3e572364ee73..3d7f08bd9030 100644 --- a/include/asm-arm/memory.h +++ b/include/asm-arm/memory.h @@ -58,6 +58,12 @@ #endif /* + * Convert a physical address to a Page Frame Number and back + */ +#define __phys_to_pfn(paddr) ((paddr) >> PAGE_SHIFT) +#define __pfn_to_phys(pfn) ((pfn) << PAGE_SHIFT) + +/* * The module space lives between the addresses given by TASK_SIZE * and PAGE_OFFSET - it must be within 32MB of the kernel text. */ |