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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * machine_kexec.c - handle transition of Linux booting another kernel
4 * Copyright (C) 2002-2003 Eric Biederman <ebiederm@xmission.com>
5 *
6 * GameCube/ppc32 port Copyright (C) 2004 Albert Herranz
7 * LANDISK/sh4 supported by kogiidena
8 */
9#include <linux/mm.h>
10#include <linux/kexec.h>
11#include <linux/delay.h>
12#include <linux/reboot.h>
13#include <linux/numa.h>
14#include <linux/ftrace.h>
15#include <linux/suspend.h>
16#include <linux/memblock.h>
17#include <asm/pgtable.h>
18#include <asm/pgalloc.h>
19#include <asm/mmu_context.h>
20#include <asm/io.h>
21#include <asm/cacheflush.h>
22#include <asm/sh_bios.h>
23#include <asm/reboot.h>
24
25typedef void (*relocate_new_kernel_t)(unsigned long indirection_page,
26 unsigned long reboot_code_buffer,
27 unsigned long start_address);
28
29extern const unsigned char relocate_new_kernel[];
30extern const unsigned int relocate_new_kernel_size;
31extern void *vbr_base;
32
33void native_machine_crash_shutdown(struct pt_regs *regs)
34{
35 /* Nothing to do for UP, but definitely broken for SMP.. */
36}
37
38/*
39 * Do what every setup is needed on image and the
40 * reboot code buffer to allow us to avoid allocations
41 * later.
42 */
43int machine_kexec_prepare(struct kimage *image)
44{
45 return 0;
46}
47
48void machine_kexec_cleanup(struct kimage *image)
49{
50}
51
52static void kexec_info(struct kimage *image)
53{
54 int i;
55 printk("kexec information\n");
56 for (i = 0; i < image->nr_segments; i++) {
57 printk(" segment[%d]: 0x%08x - 0x%08x (0x%08x)\n",
58 i,
59 (unsigned int)image->segment[i].mem,
60 (unsigned int)image->segment[i].mem +
61 image->segment[i].memsz,
62 (unsigned int)image->segment[i].memsz);
63 }
64 printk(" start : 0x%08x\n\n", (unsigned int)image->start);
65}
66
67/*
68 * Do not allocate memory (or fail in any way) in machine_kexec().
69 * We are past the point of no return, committed to rebooting now.
70 */
71void machine_kexec(struct kimage *image)
72{
73 unsigned long page_list;
74 unsigned long reboot_code_buffer;
75 relocate_new_kernel_t rnk;
76 unsigned long entry;
77 unsigned long *ptr;
78 int save_ftrace_enabled;
79
80 /*
81 * Nicked from the mips version of machine_kexec():
82 * The generic kexec code builds a page list with physical
83 * addresses. Use phys_to_virt() to convert them to virtual.
84 */
85 for (ptr = &image->head; (entry = *ptr) && !(entry & IND_DONE);
86 ptr = (entry & IND_INDIRECTION) ?
87 phys_to_virt(entry & PAGE_MASK) : ptr + 1) {
88 if (*ptr & IND_SOURCE || *ptr & IND_INDIRECTION ||
89 *ptr & IND_DESTINATION)
90 *ptr = (unsigned long) phys_to_virt(*ptr);
91 }
92
93#ifdef CONFIG_KEXEC_JUMP
94 if (image->preserve_context)
95 save_processor_state();
96#endif
97
98 save_ftrace_enabled = __ftrace_enabled_save();
99
100 /* Interrupts aren't acceptable while we reboot */
101 local_irq_disable();
102
103 page_list = image->head;
104
105 /* we need both effective and real address here */
106 reboot_code_buffer =
107 (unsigned long)page_address(image->control_code_page);
108
109 /* copy our kernel relocation code to the control code page */
110 memcpy((void *)reboot_code_buffer, relocate_new_kernel,
111 relocate_new_kernel_size);
112
113 kexec_info(image);
114 flush_cache_all();
115
116 sh_bios_vbr_reload();
117
118 /* now call it */
119 rnk = (relocate_new_kernel_t) reboot_code_buffer;
120 (*rnk)(page_list, reboot_code_buffer,
121 (unsigned long)phys_to_virt(image->start));
122
123#ifdef CONFIG_KEXEC_JUMP
124 asm volatile("ldc %0, vbr" : : "r" (&vbr_base) : "memory");
125
126 if (image->preserve_context)
127 restore_processor_state();
128
129 /* Convert page list back to physical addresses, what a mess. */
130 for (ptr = &image->head; (entry = *ptr) && !(entry & IND_DONE);
131 ptr = (*ptr & IND_INDIRECTION) ?
132 phys_to_virt(*ptr & PAGE_MASK) : ptr + 1) {
133 if (*ptr & IND_SOURCE || *ptr & IND_INDIRECTION ||
134 *ptr & IND_DESTINATION)
135 *ptr = virt_to_phys(*ptr);
136 }
137#endif
138
139 __ftrace_enabled_restore(save_ftrace_enabled);
140}
141
142void arch_crash_save_vmcoreinfo(void)
143{
144#ifdef CONFIG_NUMA
145 VMCOREINFO_SYMBOL(node_data);
146 VMCOREINFO_LENGTH(node_data, MAX_NUMNODES);
147#endif
148#ifdef CONFIG_X2TLB
149 VMCOREINFO_CONFIG(X2TLB);
150#endif
151}
152
153void __init reserve_crashkernel(void)
154{
155 unsigned long long crash_size, crash_base;
156 int ret;
157
158 ret = parse_crashkernel(boot_command_line, memblock_phys_mem_size(),
159 &crash_size, &crash_base);
160 if (ret == 0 && crash_size > 0) {
161 crashk_res.start = crash_base;
162 crashk_res.end = crash_base + crash_size - 1;
163 }
164
165 if (crashk_res.end == crashk_res.start)
166 goto disable;
167
168 crash_size = PAGE_ALIGN(resource_size(&crashk_res));
169 if (!crashk_res.start) {
170 unsigned long max = memblock_end_of_DRAM() - memory_limit;
171 crashk_res.start = memblock_phys_alloc_range(crash_size,
172 PAGE_SIZE, 0, max);
173 if (!crashk_res.start) {
174 pr_err("crashkernel allocation failed\n");
175 goto disable;
176 }
177 } else {
178 ret = memblock_reserve(crashk_res.start, crash_size);
179 if (unlikely(ret < 0)) {
180 pr_err("crashkernel reservation failed - "
181 "memory is in use\n");
182 goto disable;
183 }
184 }
185
186 crashk_res.end = crashk_res.start + crash_size - 1;
187
188 /*
189 * Crash kernel trumps memory limit
190 */
191 if ((memblock_end_of_DRAM() - memory_limit) <= crashk_res.end) {
192 memory_limit = 0;
193 pr_info("Disabled memory limit for crashkernel\n");
194 }
195
196 pr_info("Reserving %ldMB of memory at 0x%08lx "
197 "for crashkernel (System RAM: %ldMB)\n",
198 (unsigned long)(crash_size >> 20),
199 (unsigned long)(crashk_res.start),
200 (unsigned long)(memblock_phys_mem_size() >> 20));
201
202 return;
203
204disable:
205 crashk_res.start = crashk_res.end = 0;
206}
1/*
2 * machine_kexec.c - handle transition of Linux booting another kernel
3 * Copyright (C) 2002-2003 Eric Biederman <ebiederm@xmission.com>
4 *
5 * GameCube/ppc32 port Copyright (C) 2004 Albert Herranz
6 * LANDISK/sh4 supported by kogiidena
7 *
8 * This source code is licensed under the GNU General Public License,
9 * Version 2. See the file COPYING for more details.
10 */
11#include <linux/mm.h>
12#include <linux/kexec.h>
13#include <linux/delay.h>
14#include <linux/reboot.h>
15#include <linux/numa.h>
16#include <linux/ftrace.h>
17#include <linux/suspend.h>
18#include <linux/memblock.h>
19#include <asm/pgtable.h>
20#include <asm/pgalloc.h>
21#include <asm/mmu_context.h>
22#include <asm/io.h>
23#include <asm/cacheflush.h>
24#include <asm/sh_bios.h>
25#include <asm/reboot.h>
26
27typedef void (*relocate_new_kernel_t)(unsigned long indirection_page,
28 unsigned long reboot_code_buffer,
29 unsigned long start_address);
30
31extern const unsigned char relocate_new_kernel[];
32extern const unsigned int relocate_new_kernel_size;
33extern void *vbr_base;
34
35void native_machine_crash_shutdown(struct pt_regs *regs)
36{
37 /* Nothing to do for UP, but definitely broken for SMP.. */
38}
39
40/*
41 * Do what every setup is needed on image and the
42 * reboot code buffer to allow us to avoid allocations
43 * later.
44 */
45int machine_kexec_prepare(struct kimage *image)
46{
47 return 0;
48}
49
50void machine_kexec_cleanup(struct kimage *image)
51{
52}
53
54static void kexec_info(struct kimage *image)
55{
56 int i;
57 printk("kexec information\n");
58 for (i = 0; i < image->nr_segments; i++) {
59 printk(" segment[%d]: 0x%08x - 0x%08x (0x%08x)\n",
60 i,
61 (unsigned int)image->segment[i].mem,
62 (unsigned int)image->segment[i].mem +
63 image->segment[i].memsz,
64 (unsigned int)image->segment[i].memsz);
65 }
66 printk(" start : 0x%08x\n\n", (unsigned int)image->start);
67}
68
69/*
70 * Do not allocate memory (or fail in any way) in machine_kexec().
71 * We are past the point of no return, committed to rebooting now.
72 */
73void machine_kexec(struct kimage *image)
74{
75 unsigned long page_list;
76 unsigned long reboot_code_buffer;
77 relocate_new_kernel_t rnk;
78 unsigned long entry;
79 unsigned long *ptr;
80 int save_ftrace_enabled;
81
82 /*
83 * Nicked from the mips version of machine_kexec():
84 * The generic kexec code builds a page list with physical
85 * addresses. Use phys_to_virt() to convert them to virtual.
86 */
87 for (ptr = &image->head; (entry = *ptr) && !(entry & IND_DONE);
88 ptr = (entry & IND_INDIRECTION) ?
89 phys_to_virt(entry & PAGE_MASK) : ptr + 1) {
90 if (*ptr & IND_SOURCE || *ptr & IND_INDIRECTION ||
91 *ptr & IND_DESTINATION)
92 *ptr = (unsigned long) phys_to_virt(*ptr);
93 }
94
95#ifdef CONFIG_KEXEC_JUMP
96 if (image->preserve_context)
97 save_processor_state();
98#endif
99
100 save_ftrace_enabled = __ftrace_enabled_save();
101
102 /* Interrupts aren't acceptable while we reboot */
103 local_irq_disable();
104
105 page_list = image->head;
106
107 /* we need both effective and real address here */
108 reboot_code_buffer =
109 (unsigned long)page_address(image->control_code_page);
110
111 /* copy our kernel relocation code to the control code page */
112 memcpy((void *)reboot_code_buffer, relocate_new_kernel,
113 relocate_new_kernel_size);
114
115 kexec_info(image);
116 flush_cache_all();
117
118 sh_bios_vbr_reload();
119
120 /* now call it */
121 rnk = (relocate_new_kernel_t) reboot_code_buffer;
122 (*rnk)(page_list, reboot_code_buffer,
123 (unsigned long)phys_to_virt(image->start));
124
125#ifdef CONFIG_KEXEC_JUMP
126 asm volatile("ldc %0, vbr" : : "r" (&vbr_base) : "memory");
127
128 if (image->preserve_context)
129 restore_processor_state();
130
131 /* Convert page list back to physical addresses, what a mess. */
132 for (ptr = &image->head; (entry = *ptr) && !(entry & IND_DONE);
133 ptr = (*ptr & IND_INDIRECTION) ?
134 phys_to_virt(*ptr & PAGE_MASK) : ptr + 1) {
135 if (*ptr & IND_SOURCE || *ptr & IND_INDIRECTION ||
136 *ptr & IND_DESTINATION)
137 *ptr = virt_to_phys(*ptr);
138 }
139#endif
140
141 __ftrace_enabled_restore(save_ftrace_enabled);
142}
143
144void arch_crash_save_vmcoreinfo(void)
145{
146#ifdef CONFIG_NUMA
147 VMCOREINFO_SYMBOL(node_data);
148 VMCOREINFO_LENGTH(node_data, MAX_NUMNODES);
149#endif
150#ifdef CONFIG_X2TLB
151 VMCOREINFO_CONFIG(X2TLB);
152#endif
153}
154
155void __init reserve_crashkernel(void)
156{
157 unsigned long long crash_size, crash_base;
158 int ret;
159
160 ret = parse_crashkernel(boot_command_line, memblock_phys_mem_size(),
161 &crash_size, &crash_base);
162 if (ret == 0 && crash_size > 0) {
163 crashk_res.start = crash_base;
164 crashk_res.end = crash_base + crash_size - 1;
165 }
166
167 if (crashk_res.end == crashk_res.start)
168 goto disable;
169
170 crash_size = PAGE_ALIGN(resource_size(&crashk_res));
171 if (!crashk_res.start) {
172 unsigned long max = memblock_end_of_DRAM() - memory_limit;
173 crashk_res.start = __memblock_alloc_base(crash_size, PAGE_SIZE, max);
174 if (!crashk_res.start) {
175 pr_err("crashkernel allocation failed\n");
176 goto disable;
177 }
178 } else {
179 ret = memblock_reserve(crashk_res.start, crash_size);
180 if (unlikely(ret < 0)) {
181 pr_err("crashkernel reservation failed - "
182 "memory is in use\n");
183 goto disable;
184 }
185 }
186
187 crashk_res.end = crashk_res.start + crash_size - 1;
188
189 /*
190 * Crash kernel trumps memory limit
191 */
192 if ((memblock_end_of_DRAM() - memory_limit) <= crashk_res.end) {
193 memory_limit = 0;
194 pr_info("Disabled memory limit for crashkernel\n");
195 }
196
197 pr_info("Reserving %ldMB of memory at 0x%08lx "
198 "for crashkernel (System RAM: %ldMB)\n",
199 (unsigned long)(crash_size >> 20),
200 (unsigned long)(crashk_res.start),
201 (unsigned long)(memblock_phys_mem_size() >> 20));
202
203 return;
204
205disable:
206 crashk_res.start = crashk_res.end = 0;
207}