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/*
* arch/s390/kernel/machine_kexec.c
*
* (C) Copyright IBM Corp. 2005
*
* Author(s): Rolf Adelsberger <adelsberger@de.ibm.com>
*
*/
/*
* s390_machine_kexec.c - handle the transition of Linux booting another kernel
* on the S390 architecture.
*/
#include <asm/cio.h>
#include <asm/setup.h>
#include <linux/device.h>
#include <linux/mm.h>
#include <linux/kexec.h>
#include <linux/delay.h>
#include <asm/pgtable.h>
#include <asm/pgalloc.h>
#include <asm/system.h>
static void kexec_halt_all_cpus(void *);
typedef void (*relocate_kernel_t) (kimage_entry_t *, unsigned long);
const extern unsigned char relocate_kernel[];
const extern unsigned long long relocate_kernel_len;
int
machine_kexec_prepare(struct kimage *image)
{
unsigned long reboot_code_buffer;
/* 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 = page_to_pfn(image->control_code_page)<<PAGE_SHIFT;
/* Then copy it */
memcpy((void *) reboot_code_buffer, relocate_kernel,
relocate_kernel_len);
return 0;
}
void
machine_kexec_cleanup(struct kimage *image)
{
}
void
machine_shutdown(void)
{
printk(KERN_INFO "kexec: machine_shutdown called\n");
}
NORET_TYPE void
machine_kexec(struct kimage *image)
{
clear_all_subchannels();
/* Disable lowcore protection */
ctl_clear_bit(0,28);
on_each_cpu(kexec_halt_all_cpus, image, 0, 0);
for(;;);
}
static void
kexec_halt_all_cpus(void *kernel_image)
{
static atomic_t cpuid = ATOMIC_INIT(-1);
int cpu;
struct kimage *image;
relocate_kernel_t data_mover;
if (atomic_compare_and_swap(-1, smp_processor_id(), &cpuid))
signal_processor(smp_processor_id(), sigp_stop);
/* Wait for all other cpus to enter stopped state */
for_each_online_cpu(cpu) {
if (cpu == smp_processor_id())
continue;
while(!smp_cpu_not_running(cpu))
cpu_relax();
}
image = (struct kimage *) kernel_image;
data_mover = (relocate_kernel_t)
(page_to_pfn(image->control_code_page) << PAGE_SHIFT);
/* Call the moving routine */
(*data_mover) (&image->head, image->start);
}
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