mirror of
https://github.com/torvalds/linux.git
synced 2024-11-05 19:41:54 +00:00
4d5ade5b29
This adds support for kexec based crash dumps. Signed-off-by: Paul Mundt <lethal@linux-sh.org>
128 lines
3.3 KiB
C
128 lines
3.3 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
|
|
* LANDISK/sh4 supported by kogiidena
|
|
*
|
|
* 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/cacheflush.h>
|
|
|
|
typedef NORET_TYPE void (*relocate_new_kernel_t)(
|
|
unsigned long indirection_page,
|
|
unsigned long reboot_code_buffer,
|
|
unsigned long start_address,
|
|
unsigned long vbr_reg) ATTRIB_NORET;
|
|
|
|
extern const unsigned char relocate_new_kernel[];
|
|
extern const unsigned int relocate_new_kernel_size;
|
|
extern void *gdb_vbr_vector;
|
|
|
|
void machine_shutdown(void)
|
|
{
|
|
}
|
|
|
|
void machine_crash_shutdown(struct pt_regs *regs)
|
|
{
|
|
}
|
|
|
|
/*
|
|
* 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)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
void machine_kexec_cleanup(struct kimage *image)
|
|
{
|
|
}
|
|
|
|
static void kexec_info(struct kimage *image)
|
|
{
|
|
int i;
|
|
printk("kexec information\n");
|
|
for (i = 0; i < image->nr_segments; i++) {
|
|
printk(" segment[%d]: 0x%08x - 0x%08x (0x%08x)\n",
|
|
i,
|
|
(unsigned int)image->segment[i].mem,
|
|
(unsigned int)image->segment[i].mem +
|
|
image->segment[i].memsz,
|
|
(unsigned int)image->segment[i].memsz);
|
|
}
|
|
printk(" start : 0x%08x\n\n", (unsigned int)image->start);
|
|
}
|
|
|
|
/*
|
|
* 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)
|
|
{
|
|
|
|
unsigned long page_list;
|
|
unsigned long reboot_code_buffer;
|
|
unsigned long vbr_reg;
|
|
relocate_new_kernel_t rnk;
|
|
|
|
#if defined(CONFIG_SH_STANDARD_BIOS)
|
|
vbr_reg = ((unsigned long )gdb_vbr_vector) - 0x100;
|
|
#else
|
|
vbr_reg = 0x80000000; // dummy
|
|
#endif
|
|
/* 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);
|
|
|
|
/* copy our kernel relocation code to the control code page */
|
|
memcpy((void *)reboot_code_buffer, relocate_new_kernel,
|
|
relocate_new_kernel_size);
|
|
|
|
kexec_info(image);
|
|
flush_cache_all();
|
|
|
|
/* now call it */
|
|
rnk = (relocate_new_kernel_t) reboot_code_buffer;
|
|
(*rnk)(page_list, reboot_code_buffer, image->start, vbr_reg);
|
|
}
|
|
|
|
/* crashkernel=size@addr specifies the location to reserve for
|
|
* a crash kernel. By reserving this memory we guarantee
|
|
* that linux never sets it up as a DMA target.
|
|
* Useful for holding code to do something appropriate
|
|
* after a kernel panic.
|
|
*/
|
|
static int __init parse_crashkernel(char *arg)
|
|
{
|
|
unsigned long size, base;
|
|
size = memparse(arg, &arg);
|
|
if (*arg == '@') {
|
|
base = memparse(arg+1, &arg);
|
|
/* FIXME: Do I want a sanity check
|
|
* to validate the memory range?
|
|
*/
|
|
crashk_res.start = base;
|
|
crashk_res.end = base + size - 1;
|
|
}
|
|
return 0;
|
|
}
|
|
early_param("crashkernel", parse_crashkernel);
|