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