diff options
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/Makefile | 2 | ||||
| -rw-r--r-- | lib/check_signature.c | 26 |
2 files changed, 27 insertions, 1 deletions
diff --git a/lib/Makefile b/lib/Makefile index d1b366bdf86..d7a93ff7f5a 100644 --- a/lib/Makefile +++ b/lib/Makefile @@ -13,7 +13,7 @@ lib-$(CONFIG_SMP) += cpumask.o lib-y += kobject.o kref.o kobject_uevent.o klist.o obj-y += div64.o sort.o parser.o halfmd4.o debug_locks.o random32.o \ - bust_spinlocks.o hexdump.o + bust_spinlocks.o hexdump.o check_signature.o ifeq ($(CONFIG_DEBUG_KOBJECT),y) CFLAGS_kobject.o += -DDEBUG diff --git a/lib/check_signature.c b/lib/check_signature.c new file mode 100644 index 00000000000..fd6af199247 --- /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); |