arch/um/kernel/initrd.c

// SPDX-License-Identifier: GPL-2.0
/*
 * Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
 */

#include <linux/init.h>
#include <linux/memblock.h>
#include <linux/initrd.h>
#include <asm/types.h>
#include <init.h>
#include <os.h>

#include "um_arch.h"

/* Changed by uml_initrd_setup, which is a setup */
static char *initrd __initdata = NULL;

int __init read_initrd(void)
{
	unsigned long long size;
	void *area;

	if (!initrd)
		return 0;

	area = uml_load_file(initrd, &size);
	if (!area)
		return 0;

	initrd_start = (unsigned long) area;
	initrd_end = initrd_start + size;
	return 0;
}

static int __init uml_initrd_setup(char *line, int *add)
{
	initrd = line;
	return 0;
}

__uml_setup("initrd=", uml_initrd_setup,
"initrd=<initrd image>\n"
"    This is used to boot UML from an initrd image.  The argument is the\n"
"    name of the file containing the image.\n\n"
);