tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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
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);