blob: 85beb9b0b2d0122832017e1d73387f63a8d5d956 [file] [log] [blame]
Nicolas Schichan583bb862006-10-18 15:14:55 +02001/*
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
Tobias Klauserc5a69d52007-02-17 20:11:19 +010016extern const unsigned char relocate_new_kernel[];
Ralf Baechle10659322007-07-31 15:16:32 +010017extern const size_t relocate_new_kernel_size;
Nicolas Schichan583bb862006-10-18 15:14:55 +020018
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
Ralf Baechle10659322007-07-31 15:16:32 +010043typedef void (*noretfun_t)(void) __attribute__((noreturn));
44
Nicolas Schichan583bb862006-10-18 15:14:55 +020045void
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;
Ralf Baechle10659322007-07-31 15:16:32 +010056 kexec_indirection_page =
57 (unsigned long) phys_to_virt(image->head & PAGE_MASK);
Nicolas Schichan583bb862006-10-18 15:14:55 +020058
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)
Ralf Baechle10659322007-07-31 15:16:32 +010073 *ptr = (unsigned long) phys_to_virt(*ptr);
Nicolas Schichan583bb862006-10-18 15:14:55 +020074 }
75
76 /*
77 * we do not want to be bothered.
78 */
79 local_irq_disable();
80
Ralf Baechle10659322007-07-31 15:16:32 +010081 printk("Will call new kernel at %08lx\n", image->start);
Nicolas Schichan583bb862006-10-18 15:14:55 +020082 printk("Bye ...\n");
Nicolas Schichan97ce9a82007-08-20 15:57:38 +020083 __flush_cache_all();
Ralf Baechle10659322007-07-31 15:16:32 +010084 ((noretfun_t) reboot_code_buffer)();
Nicolas Schichan583bb862006-10-18 15:14:55 +020085}