[mirror_ubuntu-bionic-kernel.git] / lib / check_signature.c

// 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);
Commit	Line	Data
b2441318	1	// SPDX-License-Identifier: GPL-2.0
cc2ea416	2	#include <linux/io.h>
8bc3bcc9	3	#include <linux/export.h>
cc2ea416 AM	4
	5	/**
	6	* check_signature - find BIOS signatures
	7	* @io_addr: mmio address to check
	8	* @signature: signature block
	9	* @length: length of signature
	10	*
	11	* Perform a signature comparison with the mmio address io_addr. This
	12	* address should have been obtained by ioremap.
	13	* Returns 1 on a match.
	14	*/
	15
	16	int check_signature(const volatile void __iomem *io_addr,
	17	const unsigned char *signature, int length)
	18	{
	19	while (length--) {
	20	if (readb(io_addr) != *signature)
	21	return 0;
	22	io_addr++;
	23	signature++;
	24	}
	25	return 1;
	26	}
	27	EXPORT_SYMBOL(check_signature);