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#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);