arm64: dts: Revert "specify console via command line"
[linux/fpc-iii.git] / arch / sh / kernel / machine_kexec.c
blob63d63a36f6f29e8299fa8625374daf52cfe8a33c
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>
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>
25 typedef void (*relocate_new_kernel_t)(unsigned long indirection_page,
26 unsigned long reboot_code_buffer,
27 unsigned long start_address);
29 extern const unsigned char relocate_new_kernel[];
30 extern const unsigned int relocate_new_kernel_size;
31 extern void *vbr_base;
33 void native_machine_crash_shutdown(struct pt_regs *regs)
35 /* Nothing to do for UP, but definitely broken for SMP.. */
39 * Do what every setup is needed on image and the
40 * reboot code buffer to allow us to avoid allocations
41 * later.
43 int machine_kexec_prepare(struct kimage *image)
45 return 0;
48 void machine_kexec_cleanup(struct kimage *image)
52 static void kexec_info(struct kimage *image)
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",
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);
64 printk(" start : 0x%08x\n\n", (unsigned int)image->start);
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.
71 void machine_kexec(struct kimage *image)
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;
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.
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);
93 #ifdef CONFIG_KEXEC_JUMP
94 if (image->preserve_context)
95 save_processor_state();
96 #endif
98 save_ftrace_enabled = __ftrace_enabled_save();
100 /* Interrupts aren't acceptable while we reboot */
101 local_irq_disable();
103 page_list = image->head;
105 /* we need both effective and real address here */
106 reboot_code_buffer =
107 (unsigned long)page_address(image->control_code_page);
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);
113 kexec_info(image);
114 flush_cache_all();
116 sh_bios_vbr_reload();
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));
123 #ifdef CONFIG_KEXEC_JUMP
124 asm volatile("ldc %0, vbr" : : "r" (&vbr_base) : "memory");
126 if (image->preserve_context)
127 restore_processor_state();
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);
137 #endif
139 __ftrace_enabled_restore(save_ftrace_enabled);
142 void arch_crash_save_vmcoreinfo(void)
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
153 void __init reserve_crashkernel(void)
155 unsigned long long crash_size, crash_base;
156 int ret;
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;
165 if (crashk_res.end == crashk_res.start)
166 goto disable;
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;
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;
186 crashk_res.end = crashk_res.start + crash_size - 1;
189 * Crash kernel trumps memory limit
191 if ((memblock_end_of_DRAM() - memory_limit) <= crashk_res.end) {
192 memory_limit = 0;
193 pr_info("Disabled memory limit for crashkernel\n");
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));
202 return;
204 disable:
205 crashk_res.start = crashk_res.end = 0;