86 lines
1.7 KiB
C
86 lines
1.7 KiB
C
/*
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* Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
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* Licensed under the GPL
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*/
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#include <linux/init.h>
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#include <linux/bootmem.h>
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#include <linux/initrd.h>
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#include <asm/types.h>
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#include <init.h>
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#include <os.h>
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/* Changed by uml_initrd_setup, which is a setup */
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static char *initrd __initdata = NULL;
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static int load_initrd(char *filename, void *buf, int size);
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static int __init read_initrd(void)
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{
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void *area;
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long long size;
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int err;
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if (initrd == NULL)
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return 0;
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err = os_file_size(initrd, &size);
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if (err)
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return 0;
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/*
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* This is necessary because alloc_bootmem craps out if you
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* ask for no memory.
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*/
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if (size == 0) {
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printk(KERN_ERR "\"%s\" is a zero-size initrd\n", initrd);
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return 0;
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}
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area = alloc_bootmem(size);
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if (area == NULL)
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return 0;
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if (load_initrd(initrd, area, size) == -1)
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return 0;
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initrd_start = (unsigned long) area;
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initrd_end = initrd_start + size;
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return 0;
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}
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__uml_postsetup(read_initrd);
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static int __init uml_initrd_setup(char *line, int *add)
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{
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initrd = line;
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return 0;
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}
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__uml_setup("initrd=", uml_initrd_setup,
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"initrd=<initrd image>\n"
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" This is used to boot UML from an initrd image. The argument is the\n"
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" name of the file containing the image.\n\n"
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);
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static int load_initrd(char *filename, void *buf, int size)
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{
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int fd, n;
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fd = os_open_file(filename, of_read(OPENFLAGS()), 0);
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if (fd < 0) {
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printk(KERN_ERR "Opening '%s' failed - err = %d\n", filename,
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-fd);
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return -1;
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}
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n = os_read_file(fd, buf, size);
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if (n != size) {
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printk(KERN_ERR "Read of %d bytes from '%s' failed, "
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"err = %d\n", size,
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filename, -n);
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return -1;
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}
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os_close_file(fd);
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return 0;
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}
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