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| author | Matthew Wilcox <matthew@wil.cx> | 2006-10-11 01:22:02 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-10-11 11:14:23 -0700 |
| commit | e50190a8341485b413f599033cb74649f849d939 (patch) | |
| tree | c45e165f8167dd95f3b5d4163433b91c8b7afd55 /include/linux/io.h | |
| parent | 53d5ed627df852ba8bab7f70df25290bd733792c (diff) | |
| download | lwn-e50190a8341485b413f599033cb74649f849d939.tar.gz lwn-e50190a8341485b413f599033cb74649f849d939.zip | |
[PATCH] Consolidate check_signature
There's nothing arch-specific about check_signature(), so move it to
<linux/io.h>. Use a cross between the Alpha and i386 implementations as
the generic one.
Signed-off-by: Matthew Wilcox <willy@parisc-linux.org>
Acked-by: Alan Cox <alan@redhat.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'include/linux/io.h')
| -rw-r--r-- | include/linux/io.h | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/include/linux/io.h b/include/linux/io.h index 2ad96c3f0e4e..81877ea39309 100644 --- a/include/linux/io.h +++ b/include/linux/io.h @@ -28,4 +28,31 @@ void __iowrite64_copy(void __iomem *to, const void *from, size_t count); int ioremap_page_range(unsigned long addr, unsigned long end, unsigned long phys_addr, pgprot_t prot); +/** + * check_signature - find BIOS signatures + * @io_addr: mmio address to check + * @signature: signature block + * @length: length of signature + * + * Perform a signature comparison with the mmio address io_addr. This + * address should have been obtained by ioremap. + * Returns 1 on a match. + */ + +static inline int check_signature(const volatile void __iomem *io_addr, + const unsigned char *signature, int length) +{ + int retval = 0; + do { + if (readb(io_addr) != *signature) + goto out; + io_addr++; + signature++; + length--; + } while (length); + retval = 1; +out: + return retval; +} + #endif /* _LINUX_IO_H */ |