uninline check_signature()

[net-next-2.6.git] / lib / check_signature.c

diff --git a/lib/check_signature.c b/lib/check_signature.c
new file mode 100644 (file)
index 0000000..fd6af19
--- /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);