blob: 59725204105c2b50aa476e1d0e5cb2e61d73cb7c (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
|
/*
* machine_kexec.c for kexec
* Created by <nschichan@corp.free.fr> on Thu Oct 12 15:15:06 2006
*
* This source code is licensed under the GNU General Public License,
* Version 2. See the file COPYING for more details.
*/
#include <linux/compiler.h>
#include <linux/kexec.h>
#include <linux/mm.h>
#include <linux/delay.h>
#include <asm/cacheflush.h>
#include <asm/page.h>
extern const unsigned char relocate_new_kernel[];
extern const size_t relocate_new_kernel_size;
extern unsigned long kexec_start_address;
extern unsigned long kexec_indirection_page;
int (*_machine_kexec_prepare)(struct kimage *) = NULL;
void (*_machine_kexec_shutdown)(void) = NULL;
void (*_machine_crash_shutdown)(struct pt_regs *regs) = NULL;
#ifdef CONFIG_SMP
void (*relocated_kexec_smp_wait) (void *);
atomic_t kexec_ready_to_reboot = ATOMIC_INIT(0);
void (*_crash_smp_send_stop)(void) = NULL;
#endif
int
machine_kexec_prepare(struct kimage *kimage)
{
if (_machine_kexec_prepare)
return _machine_kexec_prepare(kimage);
return 0;
}
void
machine_kexec_cleanup(struct kimage *kimage)
{
}
void
machine_shutdown(void)
{
if (_machine_kexec_shutdown)
_machine_kexec_shutdown();
}
void
machine_crash_shutdown(struct pt_regs *regs)
{
if (_machine_crash_shutdown)
_machine_crash_shutdown(regs);
else
default_machine_crash_shutdown(regs);
}
typedef void (*noretfun_t)(void) __noreturn;
void
machine_kexec(struct kimage *image)
{
unsigned long reboot_code_buffer;
unsigned long entry;
unsigned long *ptr;
reboot_code_buffer =
(unsigned long)page_address(image->control_code_page);
kexec_start_address =
(unsigned long) phys_to_virt(image->start);
if (image->type == KEXEC_TYPE_DEFAULT) {
kexec_indirection_page =
(unsigned long) phys_to_virt(image->head & PAGE_MASK);
} else {
kexec_indirection_page = (unsigned long)&image->head;
}
memcpy((void*)reboot_code_buffer, relocate_new_kernel,
relocate_new_kernel_size);
/*
* The generic kexec code builds a page list with physical
* addresses. they are directly accessible through KSEG0 (or
* CKSEG0 or XPHYS if on 64bit system), hence the
* phys_to_virt() call.
*/
for (ptr = &image->head; (entry = *ptr) && !(entry &IND_DONE);
ptr = (entry & IND_INDIRECTION) ?
phys_to_virt(entry & PAGE_MASK) : ptr + 1) {
if (*ptr & IND_SOURCE || *ptr & IND_INDIRECTION ||
*ptr & IND_DESTINATION)
*ptr = (unsigned long) phys_to_virt(*ptr);
}
/*
* we do not want to be bothered.
*/
local_irq_disable();
printk("Will call new kernel at %08lx\n", image->start);
printk("Bye ...\n");
__flush_cache_all();
#ifdef CONFIG_SMP
/* All secondary cpus now may jump to kexec_wait cycle */
relocated_kexec_smp_wait = reboot_code_buffer +
(void *)(kexec_smp_wait - relocate_new_kernel);
smp_wmb();
atomic_set(&kexec_ready_to_reboot, 1);
#endif
((noretfun_t) reboot_code_buffer)();
}
|
