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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-11 08:27:49 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-11 08:27:49 +0000 |
commit | ace9429bb58fd418f0c81d4c2835699bddf6bde6 (patch) | |
tree | b2d64bc10158fdd5497876388cd68142ca374ed3 /lib/check_signature.c | |
parent | Initial commit. (diff) | |
download | linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.tar.xz linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.zip |
Adding upstream version 6.6.15.upstream/6.6.15
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r-- | lib/check_signature.c | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/lib/check_signature.c b/lib/check_signature.c new file mode 100644 index 0000000000..43a7301da7 --- /dev/null +++ b/lib/check_signature.c @@ -0,0 +1,27 @@ +// SPDX-License-Identifier: GPL-2.0 +#include <linux/io.h> +#include <linux/export.h> + +/** + * check_signature - find BIOS signatures + * @io_addr: mmio address to check + * @signature: signature block + * @length: length of signature + * + * Perform a signature comparison with the mmio address io_addr. This + * address should have been obtained by ioremap. + * Returns 1 on a match. + */ + +int check_signature(const volatile void __iomem *io_addr, + const unsigned char *signature, int length) +{ + while (length--) { + if (readb(io_addr) != *signature) + return 0; + io_addr++; + signature++; + } + return 1; +} +EXPORT_SYMBOL(check_signature); |