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MIPS: generic/kexec: add support for a DTB passed in a separate buffer

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Signed-off-by: Marcin Nowakowski <marcin.nowakowski@imgtec.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/14615/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
Marcin Nowakowski 2016-11-23 14:43:52 +01:00 committed by Ralf Baechle
parent 856b0f591e
commit 0014dea6b7
2 changed files with 45 additions and 0 deletions
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1
arch/mips/generic/Makefile
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@ -13,3 +13,4 @@ obj-y += irq.o
obj-y += proc.o
obj-$(CONFIG_LEGACY_BOARD_SEAD3) += board-sead3.o
obj-$(CONFIG_KEXEC) += kexec.o

44
arch/mips/generic/kexec.c Normal file
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@ -0,0 +1,44 @@
/*
* Copyright (C) 2016 Imagination Technologies
* Author: Marcin Nowakowski <marcin.nowakowski@imgtec.com>
*
* 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; either version 2 of the License, or (at your
* option) any later version.
*/
#include <linux/kexec.h>
#include <linux/libfdt.h>
#include <linux/uaccess.h>
static int generic_kexec_prepare(struct kimage *image)
{
int i;
for (i = 0; i < image->nr_segments; i++) {
struct fdt_header fdt;
if (image->segment[i].memsz <= sizeof(fdt))
continue;
if (copy_from_user(&fdt, image->segment[i].buf, sizeof(fdt)))
continue;
if (fdt_check_header(&fdt))
continue;
kexec_args[0] = -2;
kexec_args[1] = (unsigned long)
phys_to_virt((unsigned long)image->segment[i].mem);
break;
}
return 0;
}
static int __init register_generic_kexec(void)
{
_machine_kexec_prepare = generic_kexec_prepare;
return 0;
}
arch_initcall(register_generic_kexec);