361640b4fd
The file loading support in initrd.c can be re-used for loading devicetrees. Move it out of initrd.c. Signed-off-by: Vincent Whitchurch <vincent.whitchurch@axis.com> Signed-off-by: Richard Weinberger <richard@nod.at>
62 lines
1.2 KiB
C
62 lines
1.2 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
|
|
*/
|
|
#include <linux/memblock.h>
|
|
#include <os.h>
|
|
|
|
#include "um_arch.h"
|
|
|
|
static int __init __uml_load_file(const char *filename, void *buf, int size)
|
|
{
|
|
int fd, n;
|
|
|
|
fd = os_open_file(filename, of_read(OPENFLAGS()), 0);
|
|
if (fd < 0) {
|
|
printk(KERN_ERR "Opening '%s' failed - err = %d\n", filename,
|
|
-fd);
|
|
return -1;
|
|
}
|
|
n = os_read_file(fd, buf, size);
|
|
if (n != size) {
|
|
printk(KERN_ERR "Read of %d bytes from '%s' failed, "
|
|
"err = %d\n", size,
|
|
filename, -n);
|
|
return -1;
|
|
}
|
|
|
|
os_close_file(fd);
|
|
return 0;
|
|
}
|
|
|
|
void *uml_load_file(const char *filename, unsigned long long *size)
|
|
{
|
|
void *area;
|
|
int err;
|
|
|
|
*size = 0;
|
|
|
|
if (!filename)
|
|
return NULL;
|
|
|
|
err = os_file_size(filename, size);
|
|
if (err)
|
|
return NULL;
|
|
|
|
if (*size == 0) {
|
|
printk(KERN_ERR "\"%s\" is empty\n", filename);
|
|
return NULL;
|
|
}
|
|
|
|
area = memblock_alloc(*size, SMP_CACHE_BYTES);
|
|
if (!area)
|
|
panic("%s: Failed to allocate %llu bytes\n", __func__, *size);
|
|
|
|
if (__uml_load_file(filename, area, *size)) {
|
|
memblock_free(area, *size);
|
|
return NULL;
|
|
}
|
|
|
|
return area;
|
|
}
|