| 1 | |
| 2 | #include <linux/io.h>
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| 3 | #include <linux/export.h>
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| 4 |
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| 5 | |
| 6 | * check_signature - find BIOS signatures
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| 7 | * @io_addr: mmio address to check
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| 8 | * @signature: signature block
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| 9 | * @length: length of signature
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| 10 | *
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| 11 | * Perform a signature comparison with the mmio address io_addr. This
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| 12 | * address should have been obtained by ioremap.
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| 13 | * Returns 1 on a match.
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| 14 |
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| 15 |
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| 16 | int check_signature(const volatile void __iomem *io_addr,
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| 17 | const unsigned char *signature, int length)
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| 18 | {
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| 19 | while (length--) {
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| 20 | if (readb(io_addr) != *signature)
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| 21 | return 0;
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| 22 | io_addr++;
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| 23 | signature++;
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| 24 | }
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| 25 | return 1;
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| 26 | }
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| 27 | EXPORT_SYMBOL(check_signature);
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