mirror of https://gitee.com/openkylin/linux.git
76 lines
1.4 KiB
C
76 lines
1.4 KiB
C
/*
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* Copyright (C) 2000, 2001, 2002 Jeff Dike (jdike@karaya.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 "kern_util.h"
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#include "initrd.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 __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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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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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("Opening '%s' failed - err = %d\n", filename, -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("Read of %d bytes from '%s' failed, 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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