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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>
61 lines
1.2 KiB
C
61 lines
1.2 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
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*/
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#include <linux/memblock.h>
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#include <os.h>
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#include "um_arch.h"
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static int __init __uml_load_file(const 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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void *uml_load_file(const char *filename, unsigned long long *size)
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{
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void *area;
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int err;
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*size = 0;
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if (!filename)
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return NULL;
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err = os_file_size(filename, size);
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if (err)
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return NULL;
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if (*size == 0) {
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printk(KERN_ERR "\"%s\" is empty\n", filename);
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return NULL;
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}
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area = memblock_alloc(*size, SMP_CACHE_BYTES);
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if (!area)
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panic("%s: Failed to allocate %llu bytes\n", __func__, *size);
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if (__uml_load_file(filename, area, *size)) {
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memblock_free(area, *size);
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return NULL;
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}
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return area;
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}
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