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authorJames Bottomley <jejb@mulgrave.il.steeleye.com>2006-11-22 13:06:44 -0500
committerJames Bottomley <jejb@mulgrave.il.steeleye.com>2006-11-22 13:06:44 -0500
commit0bd2af46839ad6262d25714a6ec0365db9d6b98f (patch)
treedcced72d230d69fd0c5816ac6dd03ab84799a93e /include/linux/io.h
parente138a5d2356729b8752e88520cc1525fae9794ac (diff)
parentf26b90440cd74c78fe10c9bd5160809704a9627c (diff)
Merge ../scsi-rc-fixes-2.6
Diffstat (limited to 'include/linux/io.h')
-rw-r--r--include/linux/io.h27
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);
28int ioremap_page_range(unsigned long addr, unsigned long end, 28int ioremap_page_range(unsigned long addr, unsigned long end,
29 unsigned long phys_addr, pgprot_t prot); 29 unsigned long phys_addr, pgprot_t prot);
30 30
31/**
32 * check_signature - find BIOS signatures
33 * @io_addr: mmio address to check
34 * @signature: signature block
35 * @length: length of signature
36 *
37 * Perform a signature comparison with the mmio address io_addr. This
38 * address should have been obtained by ioremap.
39 * Returns 1 on a match.
40 */
41
42static inline int check_signature(const volatile void __iomem *io_addr,
43 const unsigned char *signature, int length)
44{
45 int retval = 0;
46 do {
47 if (readb(io_addr) != *signature)
48 goto out;
49 io_addr++;
50 signature++;
51 length--;
52 } while (length);
53 retval = 1;
54out:
55 return retval;
56}
57
31#endif /* _LINUX_IO_H */ 58#endif /* _LINUX_IO_H */