Root/lib/check_signature.c

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
15int 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}
26EXPORT_SYMBOL(check_signature);
27

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