1/*
2 * machine_kexec.c - handle transition of Linux booting another kernel
3 */
4#include <linux/compiler.h>
5#include <linux/kexec.h>
6#include <linux/mm.h>
7#include <linux/delay.h>
8
9#include <asm/cacheflush.h>
10#include <asm/page.h>
11#include <asm/setup.h>
12
13extern const unsigned char relocate_new_kernel[];
14extern const size_t relocate_new_kernel_size;
15
16int machine_kexec_prepare(struct kimage *kimage)
17{
18	return 0;
19}
20
21void machine_kexec_cleanup(struct kimage *kimage)
22{
23}
24
25void machine_shutdown(void)
26{
27}
28
29void machine_crash_shutdown(struct pt_regs *regs)
30{
31}
32
33typedef void (*relocate_kernel_t)(unsigned long ptr,
34				  unsigned long start,
35				  unsigned long cpu_mmu_flags) __noreturn;
36
37void machine_kexec(struct kimage *image)
38{
39	void *reboot_code_buffer;
40	unsigned long cpu_mmu_flags;
41
42	reboot_code_buffer = page_address(image->control_code_page);
43
44	memcpy(reboot_code_buffer, relocate_new_kernel,
45	       relocate_new_kernel_size);
46
47	/*
48	 * we do not want to be bothered.
49	 */
50	local_irq_disable();
51
52	pr_info("Will call new kernel at 0x%08lx. Bye...\n", image->start);
53	__flush_cache_all();
54	cpu_mmu_flags = m68k_cputype | m68k_mmutype << 8;
55	((relocate_kernel_t) reboot_code_buffer)(image->head & PAGE_MASK,
56						 image->start,
57						 cpu_mmu_flags);
58}
59