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/*
* 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);
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