Cregit: Linux 6.7: check

Contributors: 6
Author	Tokens	Token Proportion	Commits	Commit Proportion
Andrew Morton	24	38.10%	2	28.57%
Andi Kleen	17	26.98%	1	14.29%
Anton Blanchard	15	23.81%	1	14.29%
Linus Torvalds	5	7.94%	1	14.29%
Greg Kroah-Hartman	1	1.59%	1	14.29%
Paul Gortmaker	1	1.59%	1	14.29%
Total	63		7

// SPDX-License-Identifier: GPL-2.0
#include <linux/io.h>
#include <linux/export.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);

check_signature.c