1/*
2 * machine_kexec.c for kexec
3 * Created by <nschichan@corp.free.fr> on Thu Oct 12 15:15:06 2006
4 *
5 * This source code is licensed under the GNU General Public License,
6 * Version 2.  See the file COPYING for more details.
7 */
8
9#include <linux/kexec.h>
10#include <linux/mm.h>
11#include <linux/delay.h>
12
13#include <asm/cacheflush.h>
14#include <asm/page.h>
15
16extern const unsigned char relocate_new_kernel[];
17extern const size_t relocate_new_kernel_size;
18
19extern unsigned long kexec_start_address;
20extern unsigned long kexec_indirection_page;
21
22int
23machine_kexec_prepare(struct kimage *kimage)
24{
25	return 0;
26}
27
28void
29machine_kexec_cleanup(struct kimage *kimage)
30{
31}
32
33void
34machine_shutdown(void)
35{
36}
37
38void
39machine_crash_shutdown(struct pt_regs *regs)
40{
41}
42
43typedef void (*noretfun_t)(void) __attribute__((noreturn));
44
45void
46machine_kexec(struct kimage *image)
47{
48	unsigned long reboot_code_buffer;
49	unsigned long entry;
50	unsigned long *ptr;
51
52	reboot_code_buffer =
53	  (unsigned long)page_address(image->control_code_page);
54
55	kexec_start_address = image->start;
56	kexec_indirection_page =
57		(unsigned long) phys_to_virt(image->head & PAGE_MASK);
58
59	memcpy((void*)reboot_code_buffer, relocate_new_kernel,
60	       relocate_new_kernel_size);
61
62	/*
63	 * The generic kexec code builds a page list with physical
64	 * addresses. they are directly accessible through KSEG0 (or
65	 * CKSEG0 or XPHYS if on 64bit system), hence the
66	 * pys_to_virt() call.
67	 */
68	for (ptr = &image->head; (entry = *ptr) && !(entry &IND_DONE);
69	     ptr = (entry & IND_INDIRECTION) ?
70	       phys_to_virt(entry & PAGE_MASK) : ptr + 1) {
71		if (*ptr & IND_SOURCE || *ptr & IND_INDIRECTION ||
72		    *ptr & IND_DESTINATION)
73			*ptr = (unsigned long) phys_to_virt(*ptr);
74	}
75
76	/*
77	 * we do not want to be bothered.
78	 */
79	local_irq_disable();
80
81	printk("Will call new kernel at %08lx\n", image->start);
82	printk("Bye ...\n");
83	__flush_cache_all();
84	((noretfun_t) reboot_code_buffer)();
85}
86