um/kernel/initrd.c

0001 // SPDX-License-Identifier: GPL-2.0
0002 /*
0003  * Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
0004  */
0005
0006 #include <linux/init.h>
0007 #include <linux/memblock.h>
0008 #include <linux/initrd.h>
0009 #include <asm/types.h>
0010 #include <init.h>
0011 #include <os.h>
0012
0013 #include "um_arch.h"
0014
0015 /* Changed by uml_initrd_setup, which is a setup */
0016 static char *initrd __initdata = NULL;
0017
0018 int __init read_initrd(void)
0019 {
0020     unsigned long long size;
0021     void *area;
0022
0023     if (!initrd)
0024         return 0;
0025
0026     area = uml_load_file(initrd, &size);
0027     if (!area)
0028         return 0;
0029
0030     initrd_start = (unsigned long) area;
0031     initrd_end = initrd_start + size;
0032     return 0;
0033 }
0034
0035 static int __init uml_initrd_setup(char *line, int *add)
0036 {
0037     initrd = line;
0038     return 0;
0039 }
0040
0041 __uml_setup("initrd=", uml_initrd_setup,
0042 "initrd=<initrd image>\n"
0043 "    This is used to boot UML from an initrd image.  The argument is the\n"
0044 "    name of the file containing the image.\n\n"
0045 );