1 // SPDX-License-Identifier: GPL-2.0
3 * Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
6 #include <linux/init.h>
7 #include <linux/memblock.h>
8 #include <linux/initrd.h>
13 /* Changed by uml_initrd_setup, which is a setup */
14 static char *initrd __initdata = NULL;
15 static int load_initrd(char *filename, void *buf, int size);
17 int __init read_initrd(void)
26 err = os_file_size(initrd, &size);
31 * This is necessary because alloc_bootmem craps out if you
35 printk(KERN_ERR "\"%s\" is a zero-size initrd\n", initrd);
39 area = memblock_alloc(size, SMP_CACHE_BYTES);
41 panic("%s: Failed to allocate %llu bytes\n", __func__, size);
43 if (load_initrd(initrd, area, size) == -1)
46 initrd_start = (unsigned long) area;
47 initrd_end = initrd_start + size;
51 static int __init uml_initrd_setup(char *line, int *add)
57 __uml_setup("initrd=", uml_initrd_setup,
58 "initrd=<initrd image>\n"
59 " This is used to boot UML from an initrd image. The argument is the\n"
60 " name of the file containing the image.\n\n"
63 static int load_initrd(char *filename, void *buf, int size)
67 fd = os_open_file(filename, of_read(OPENFLAGS()), 0);
69 printk(KERN_ERR "Opening '%s' failed - err = %d\n", filename,
73 n = os_read_file(fd, buf, size);
75 printk(KERN_ERR "Read of %d bytes from '%s' failed, "