blob: 08587cdb64d62577e481a19df5885f6b3dc1962b [file] [log] [blame]
* machine_kexec.c - handle transition of Linux booting another kernel
* Copyright (C) 2002-2003 Eric Biederman <>
* GameCube/ppc32 port Copyright (C) 2004 Albert Herranz
* LANDISK/sh4 supported by kogiidena
* This source code is licensed under the GNU General Public License,
* Version 2. See the file COPYING for more details.
#include <linux/mm.h>
#include <linux/kexec.h>
#include <linux/delay.h>
#include <linux/reboot.h>
#include <asm/pgtable.h>
#include <asm/pgalloc.h>
#include <asm/mmu_context.h>
#include <asm/io.h>
#include <asm/cacheflush.h>
typedef NORET_TYPE void (*relocate_new_kernel_t)(
unsigned long indirection_page,
unsigned long reboot_code_buffer,
unsigned long start_address,
unsigned long vbr_reg) ATTRIB_NORET;
extern const unsigned char relocate_new_kernel[];
extern const unsigned int relocate_new_kernel_size;
extern void *gdb_vbr_vector;
void machine_shutdown(void)
void machine_crash_shutdown(struct pt_regs *regs)
* Do what every setup is needed on image and the
* reboot code buffer to allow us to avoid allocations
* later.
int machine_kexec_prepare(struct kimage *image)
return 0;
void machine_kexec_cleanup(struct kimage *image)
static void kexec_info(struct kimage *image)
int i;
printk("kexec information\n");
for (i = 0; i < image->nr_segments; i++) {
printk(" segment[%d]: 0x%08x - 0x%08x (0x%08x)\n",
(unsigned int)image->segment[i].mem,
(unsigned int)image->segment[i].mem + image->segment[i].memsz,
(unsigned int)image->segment[i].memsz);
printk(" start : 0x%08x\n\n", (unsigned int)image->start);
* Do not allocate memory (or fail in any way) in machine_kexec().
* We are past the point of no return, committed to rebooting now.
NORET_TYPE void machine_kexec(struct kimage *image)
unsigned long page_list;
unsigned long reboot_code_buffer;
unsigned long vbr_reg;
relocate_new_kernel_t rnk;
vbr_reg = ((unsigned long )gdb_vbr_vector) - 0x100;
vbr_reg = 0x80000000; // dummy
/* Interrupts aren't acceptable while we reboot */
page_list = image->head;
/* we need both effective and real address here */
reboot_code_buffer =
(unsigned long)page_address(image->control_code_page);
/* copy our kernel relocation code to the control code page */
memcpy((void *)reboot_code_buffer, relocate_new_kernel,
/* now call it */
rnk = (relocate_new_kernel_t) reboot_code_buffer;
(*rnk)(page_list, reboot_code_buffer, image->start, vbr_reg);