blob: a469ba438cbea17fc8654407d42d2744f4d4a2fc [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
* 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/hw_irq.h>
#include <asm/cacheflush.h>
#include <asm/machdep.h>
typedef NORET_TYPE void (*relocate_new_kernel_t)(
unsigned long indirection_page,
unsigned long reboot_code_buffer,
unsigned long start_address) ATTRIB_NORET;
extern const unsigned char relocate_new_kernel[];
extern const unsigned int relocate_new_kernel_size;
void machine_shutdown(void)
if (ppc_md.machine_shutdown)
void machine_crash_shutdown(struct pt_regs *regs)
if (ppc_md.machine_crash_shutdown)
* 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)
if (ppc_md.machine_kexec_prepare)
return ppc_md.machine_kexec_prepare(image);
* Fail if platform doesn't provide its own machine_kexec_prepare
* implementation.
return -ENOSYS;
void machine_kexec_cleanup(struct kimage *image)
if (ppc_md.machine_kexec_cleanup)
* 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)
if (ppc_md.machine_kexec)
else {
* Fall back to normal restart if platform doesn't provide
* its own kexec function, and user insist to kexec...
* This is a generic machine_kexec function suitable at least for
* non-OpenFirmware embedded platforms.
* It merely copies the image relocation code to the control page and
* jumps to it.
* A platform specific function may just call this one.
void machine_kexec_simple(struct kimage *image)
unsigned long page_list;
unsigned long reboot_code_buffer, reboot_code_buffer_phys;
relocate_new_kernel_t rnk;
/* 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);
reboot_code_buffer_phys = virt_to_phys((void *)reboot_code_buffer);
/* copy our kernel relocation code to the control code page */
memcpy((void *)reboot_code_buffer, relocate_new_kernel,
reboot_code_buffer + KEXEC_CONTROL_CODE_SIZE);
printk(KERN_INFO "Bye!\n");
/* now call it */
rnk = (relocate_new_kernel_t) reboot_code_buffer;
(*rnk)(page_list, reboot_code_buffer_phys, image->start);