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/*
* ppc64 fdt fixups
*
* Copyright 2015 Freescale Semiconductor, Inc.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation (version 2 of the License).
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <arch/fdt.h>
#include <libfdt.h>
#include <stdio.h>
#include <stdlib.h>
/*
* Let the kernel know it booted from kexec, as some things (e.g.
* secondary CPU release) may work differently.
*/
static int fixup_kexec_prop(void *fdt)
{
int err, nodeoffset;
nodeoffset = fdt_subnode_offset(fdt, 0, "chosen");
if (nodeoffset < 0)
nodeoffset = fdt_add_subnode(fdt, 0, "chosen");
if (nodeoffset < 0) {
printf("%s: add /chosen %s\n", __func__,
fdt_strerror(nodeoffset));
return -1;
}
err = fdt_setprop(fdt, nodeoffset, "linux,booted-from-kexec",
NULL, 0);
if (err < 0) {
printf("%s: couldn't write linux,booted-from-kexec: %s\n",
__func__, fdt_strerror(err));
return -1;
}
return 0;
}
/*
* For now, assume that the added content fits in the file.
* This should be the case when flattening from /proc/device-tree,
* and when passing in a dtb, dtc can be told to add padding.
*/
int fixup_dt(char **fdt, off_t *size)
{
int ret;
*size += 4096;
*fdt = realloc(*fdt, *size);
if (!*fdt) {
fprintf(stderr, "%s: out of memory\n", __func__);
return -1;
}
ret = fdt_open_into(*fdt, *fdt, *size);
if (ret < 0) {
fprintf(stderr, "%s: fdt_open_into: %s\n", __func__,
fdt_strerror(ret));
return -1;
}
ret = fixup_kexec_prop(*fdt);
if (ret < 0)
return ret;
return 0;
}
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