79 lines
1.7 KiB
C
79 lines
1.7 KiB
C
/*
|
|
* arch/s390/kernel/machine_kexec.c
|
|
*
|
|
* Copyright IBM Corp. 2005,2006
|
|
*
|
|
* Author(s): Rolf Adelsberger,
|
|
* Heiko Carstens <heiko.carstens@de.ibm.com>
|
|
*/
|
|
|
|
#include <linux/device.h>
|
|
#include <linux/mm.h>
|
|
#include <linux/kexec.h>
|
|
#include <linux/delay.h>
|
|
#include <linux/reboot.h>
|
|
#include <linux/ftrace.h>
|
|
#include <asm/cio.h>
|
|
#include <asm/setup.h>
|
|
#include <asm/pgtable.h>
|
|
#include <asm/pgalloc.h>
|
|
#include <asm/system.h>
|
|
#include <asm/smp.h>
|
|
#include <asm/reset.h>
|
|
#include <asm/ipl.h>
|
|
|
|
typedef void (*relocate_kernel_t)(kimage_entry_t *, unsigned long);
|
|
|
|
extern const unsigned char relocate_kernel[];
|
|
extern const unsigned long long relocate_kernel_len;
|
|
|
|
int machine_kexec_prepare(struct kimage *image)
|
|
{
|
|
void *reboot_code_buffer;
|
|
|
|
/* Can't replace kernel image since it is read-only. */
|
|
if (ipl_flags & IPL_NSS_VALID)
|
|
return -ENOSYS;
|
|
|
|
/* We don't support anything but the default image type for now. */
|
|
if (image->type != KEXEC_TYPE_DEFAULT)
|
|
return -EINVAL;
|
|
|
|
/* Get the destination where the assembler code should be copied to.*/
|
|
reboot_code_buffer = (void *) page_to_phys(image->control_code_page);
|
|
|
|
/* Then copy it */
|
|
memcpy(reboot_code_buffer, relocate_kernel, relocate_kernel_len);
|
|
return 0;
|
|
}
|
|
|
|
void machine_kexec_cleanup(struct kimage *image)
|
|
{
|
|
}
|
|
|
|
void machine_shutdown(void)
|
|
{
|
|
}
|
|
|
|
static void __machine_kexec(void *data)
|
|
{
|
|
relocate_kernel_t data_mover;
|
|
struct kimage *image = data;
|
|
|
|
pfault_fini();
|
|
s390_reset_system();
|
|
|
|
data_mover = (relocate_kernel_t) page_to_phys(image->control_code_page);
|
|
|
|
/* Call the moving routine */
|
|
(*data_mover)(&image->head, image->start);
|
|
for (;;);
|
|
}
|
|
|
|
void machine_kexec(struct kimage *image)
|
|
{
|
|
tracer_disable();
|
|
smp_send_stop();
|
|
smp_switch_to_ipl_cpu(__machine_kexec, image);
|
|
}
|