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[MIPS] Add support for kexec

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A tiny userland application loading the kernel and invoking kexec_load for 
mips is available here:

http://chac.le-poulpe.net/~nico/kexec/kexec-2006-10-18.tar.gz

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
Nicolas Schichan
2006-10-18 15:14:55 +02:00
committed by Ralf Baechle
parent c237923009
commit 583bb86fbb
10 changed files with 222 additions and 4 deletions
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85
arch/mips/kernel/machine_kexec.c Normal file
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/*
* machine_kexec.c for kexec
* Created by <nschichan@corp.free.fr> on Thu Oct 12 15:15:06 2006
*
* This source code is licensed under the GNU General Public License,
* Version 2. See the file COPYING for more details.
*/
#include <linux/kexec.h>
#include <linux/mm.h>
#include <linux/delay.h>
#include <asm/cacheflush.h>
#include <asm/page.h>
const extern unsigned char relocate_new_kernel[];
const extern unsigned int relocate_new_kernel_size;
extern unsigned long kexec_start_address;
extern unsigned long kexec_indirection_page;
int
machine_kexec_prepare(struct kimage *kimage)
{
return 0;
}
void
machine_kexec_cleanup(struct kimage *kimage)
{
}
void
machine_shutdown(void)
{
}
void
machine_crash_shutdown(struct pt_regs *regs)
{
}
void
machine_kexec(struct kimage *image)
{
unsigned long reboot_code_buffer;
unsigned long entry;
unsigned long *ptr;
reboot_code_buffer =
(unsigned long)page_address(image->control_code_page);
kexec_start_address = image->start;
kexec_indirection_page = phys_to_virt(image->head & PAGE_MASK);
memcpy((void*)reboot_code_buffer, relocate_new_kernel,
relocate_new_kernel_size);
/*
* The generic kexec code builds a page list with physical
* addresses. they are directly accessible through KSEG0 (or
* CKSEG0 or XPHYS if on 64bit system), hence the
* pys_to_virt() call.
*/
for (ptr = &image->head; (entry = *ptr) && !(entry &IND_DONE);
ptr = (entry & IND_INDIRECTION) ?
phys_to_virt(entry & PAGE_MASK) : ptr + 1) {
if (*ptr & IND_SOURCE || *ptr & IND_INDIRECTION ||
*ptr & IND_DESTINATION)
*ptr = phys_to_virt(*ptr);
}
/*
* we do not want to be bothered.
*/
local_irq_disable();
flush_icache_range(reboot_code_buffer,
reboot_code_buffer + KEXEC_CONTROL_CODE_SIZE);
printk("Will call new kernel at %08x\n", image->start);
printk("Bye ...\n");
flush_cache_all();
((void (*)(void))reboot_code_buffer)();
}