blob: 6b49797980c4f910d3456cbffc328deb82a14a1b
1 | #include <linux/io.h> |
2 | #include <linux/export.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); |
27 |