2efe55a9ce
Storage class should be before const Signed-off-by: Tobias Klauser <tklauser@nuerscht.ch> Signed-off-by: Adrian Bunk <bunk@stusta.de>
119 lines
3.1 KiB
C
119 lines
3.1 KiB
C
/*
|
|
* machine_kexec.c - handle transition of Linux booting another kernel
|
|
* Copyright (C) 2002-2003 Eric Biederman <ebiederm@xmission.com>
|
|
*
|
|
* 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)
|
|
ppc_md.machine_shutdown();
|
|
}
|
|
|
|
void machine_crash_shutdown(struct pt_regs *regs)
|
|
{
|
|
if (ppc_md.machine_crash_shutdown)
|
|
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)
|
|
ppc_md.machine_kexec_cleanup(image);
|
|
}
|
|
|
|
/*
|
|
* 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)
|
|
ppc_md.machine_kexec(image);
|
|
else {
|
|
/*
|
|
* Fall back to normal restart if platform doesn't provide
|
|
* its own kexec function, and user insist to kexec...
|
|
*/
|
|
machine_restart(NULL);
|
|
}
|
|
for(;;);
|
|
}
|
|
|
|
/*
|
|
* 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 */
|
|
local_irq_disable();
|
|
|
|
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,
|
|
relocate_new_kernel_size);
|
|
|
|
flush_icache_range(reboot_code_buffer,
|
|
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);
|
|
}
|
|
|