u-boot/arch/arm/lib/zimage.c

// SPDX-License-Identifier: GPL-2.0+
/*
 * Copyright (C) 2016
 * Ladislav Michl <ladis@linux-mips.org>
 *
 * bootz code:
 * Copyright (C) 2012 Marek Vasut <marek.vasut@gmail.com>
 */
#include <common.h>
#include <image.h>

#define	LINUX_ARM_ZIMAGE_MAGIC	0x016f2818
#define	BAREBOX_IMAGE_MAGIC	0x00786f62

struct arm_z_header {
	uint32_t	code[9];
	uint32_t	zi_magic;
	uint32_t	zi_start;
	uint32_t	zi_end;
} __attribute__ ((__packed__));

int bootz_setup(ulong image, ulong *start, ulong *end)
{
	struct arm_z_header *zi = (struct arm_z_header *)image;

	if (zi->zi_magic != LINUX_ARM_ZIMAGE_MAGIC &&
	    zi->zi_magic != BAREBOX_IMAGE_MAGIC) {
		if (!IS_ENABLED(CONFIG_SPL_BUILD))
			puts("zimage: Bad magic!\n");
		return 1;
	}

	*start = zi->zi_start;
	*end = zi->zi_end;
	if (!IS_ENABLED(CONFIG_SPL_BUILD))
		printf("Kernel image @ %#08lx [ %#08lx - %#08lx ]\n",
		       image, *start, *end);

	return 0;
}