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    #include <linux/io.h>
    
    #include <linux/export.h>
    
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    /**
     *	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);