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cc2ea416 AM |
1 | #include <linux/io.h> |
2 | #include <linux/module.h> | |
3 | ||
4 | /** | |
5 | * check_signature - find BIOS signatures | |
6 | * @io_addr: mmio address to check | |
7 | * @signature: signature block | |
8 | * @length: length of signature | |
9 | * | |
10 | * Perform a signature comparison with the mmio address io_addr. This | |
11 | * address should have been obtained by ioremap. | |
12 | * Returns 1 on a match. | |
13 | */ | |
14 | ||
15 | int check_signature(const volatile void __iomem *io_addr, | |
16 | const unsigned char *signature, int length) | |
17 | { | |
18 | while (length--) { | |
19 | if (readb(io_addr) != *signature) | |
20 | return 0; | |
21 | io_addr++; | |
22 | signature++; | |
23 | } | |
24 | return 1; | |
25 | } | |
26 | EXPORT_SYMBOL(check_signature); |