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
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
|
// SPDX-License-Identifier: GPL-2.0
/*
* 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
*/
#include <linux/mm.h>
#include <linux/kexec.h>
#include <linux/delay.h>
#include <linux/reboot.h>
#include <linux/numa.h>
#include <linux/ftrace.h>
#include <linux/suspend.h>
#include <linux/memblock.h>
#include <asm/mmu_context.h>
#include <asm/io.h>
#include <asm/cacheflush.h>
#include <asm/sh_bios.h>
#include <asm/reboot.h>
typedef void (*relocate_new_kernel_t)(unsigned long indirection_page,
unsigned long reboot_code_buffer,
unsigned long start_address);
extern const unsigned char relocate_new_kernel[];
extern const unsigned int relocate_new_kernel_size;
extern void *vbr_base;
void native_machine_crash_shutdown(struct pt_regs *regs)
{
/* Nothing to do for UP, but definitely broken for SMP.. */
}
/*
* 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.
*/
void machine_kexec(struct kimage *image)
{
unsigned long page_list;
unsigned long reboot_code_buffer;
relocate_new_kernel_t rnk;
unsigned long entry;
unsigned long *ptr;
int save_ftrace_enabled;
/*
* Nicked from the mips version of machine_kexec():
* The generic kexec code builds a page list with physical
* addresses. Use phys_to_virt() to convert them to virtual.
*/
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);
}
#ifdef CONFIG_KEXEC_JUMP
if (image->preserve_context)
save_processor_state();
#endif
save_ftrace_enabled = __ftrace_enabled_save();
/* 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();
sh_bios_vbr_reload();
/* now call it */
rnk = (relocate_new_kernel_t) reboot_code_buffer;
(*rnk)(page_list, reboot_code_buffer,
(unsigned long)phys_to_virt(image->start));
#ifdef CONFIG_KEXEC_JUMP
asm volatile("ldc %0, vbr" : : "r" (&vbr_base) : "memory");
if (image->preserve_context)
restore_processor_state();
/* Convert page list back to physical addresses, what a mess. */
for (ptr = &image->head; (entry = *ptr) && !(entry & IND_DONE);
ptr = (*ptr & IND_INDIRECTION) ?
phys_to_virt(*ptr & PAGE_MASK) : ptr + 1) {
if (*ptr & IND_SOURCE || *ptr & IND_INDIRECTION ||
*ptr & IND_DESTINATION)
*ptr = virt_to_phys(*ptr);
}
#endif
__ftrace_enabled_restore(save_ftrace_enabled);
}
void arch_crash_save_vmcoreinfo(void)
{
#ifdef CONFIG_NUMA
VMCOREINFO_SYMBOL(node_data);
VMCOREINFO_LENGTH(node_data, MAX_NUMNODES);
#endif
#ifdef CONFIG_X2TLB
VMCOREINFO_CONFIG(X2TLB);
#endif
}
void __init reserve_crashkernel(void)
{
unsigned long long crash_size, crash_base;
int ret;
ret = parse_crashkernel(boot_command_line, memblock_phys_mem_size(),
&crash_size, &crash_base, NULL, NULL);
if (ret == 0 && crash_size > 0) {
crashk_res.start = crash_base;
crashk_res.end = crash_base + crash_size - 1;
}
if (crashk_res.end == crashk_res.start)
goto disable;
crash_size = PAGE_ALIGN(resource_size(&crashk_res));
if (!crashk_res.start) {
unsigned long max = memblock_end_of_DRAM() - memory_limit;
crashk_res.start = memblock_phys_alloc_range(crash_size,
PAGE_SIZE, 0, max);
if (!crashk_res.start) {
pr_err("crashkernel allocation failed\n");
goto disable;
}
} else {
ret = memblock_reserve(crashk_res.start, crash_size);
if (unlikely(ret < 0)) {
pr_err("crashkernel reservation failed - "
"memory is in use\n");
goto disable;
}
}
crashk_res.end = crashk_res.start + crash_size - 1;
/*
* Crash kernel trumps memory limit
*/
if ((memblock_end_of_DRAM() - memory_limit) <= crashk_res.end) {
memory_limit = 0;
pr_info("Disabled memory limit for crashkernel\n");
}
pr_info("Reserving %ldMB of memory at 0x%08lx "
"for crashkernel (System RAM: %ldMB)\n",
(unsigned long)(crash_size >> 20),
(unsigned long)(crashk_res.start),
(unsigned long)(memblock_phys_mem_size() >> 20));
return;
disable:
crashk_res.start = crashk_res.end = 0;
}
|
