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author | root <root@artemis.panaceas.org> | 2015-12-25 04:40:36 +0000 |
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committer | root <root@artemis.panaceas.org> | 2015-12-25 04:40:36 +0000 |
commit | 849369d6c66d3054688672f97d31fceb8e8230fb (patch) | |
tree | 6135abc790ca67dedbe07c39806591e70eda81ce /lib/check_signature.c | |
download | linux-3.0.35-kobo-849369d6c66d3054688672f97d31fceb8e8230fb.tar.gz linux-3.0.35-kobo-849369d6c66d3054688672f97d31fceb8e8230fb.tar.bz2 linux-3.0.35-kobo-849369d6c66d3054688672f97d31fceb8e8230fb.zip |
initial_commit
Diffstat (limited to 'lib/check_signature.c')
-rw-r--r-- | lib/check_signature.c | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/lib/check_signature.c b/lib/check_signature.c new file mode 100644 index 00000000..fd6af199 --- /dev/null +++ b/lib/check_signature.c @@ -0,0 +1,26 @@ +#include <linux/io.h> +#include <linux/module.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); |