1 // SPDX-License-Identifier: GPL-2.0
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
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/pgalloc.h>
18 #include <asm/mmu_context.h>
20 #include <asm/cacheflush.h>
21 #include <asm/sh_bios.h>
22 #include <asm/reboot.h>
24 typedef void (*relocate_new_kernel_t)(unsigned long indirection_page,
25 unsigned long reboot_code_buffer,
26 unsigned long start_address);
28 extern const unsigned char relocate_new_kernel[];
29 extern const unsigned int relocate_new_kernel_size;
30 extern void *vbr_base;
32 void native_machine_crash_shutdown(struct pt_regs *regs)
34 /* Nothing to do for UP, but definitely broken for SMP.. */
38 * Do what every setup is needed on image and the
39 * reboot code buffer to allow us to avoid allocations
42 int machine_kexec_prepare(struct kimage *image)
47 void machine_kexec_cleanup(struct kimage *image)
51 static void kexec_info(struct kimage *image)
54 printk("kexec information\n");
55 for (i = 0; i < image->nr_segments; i++) {
56 printk(" segment[%d]: 0x%08x - 0x%08x (0x%08x)\n",
58 (unsigned int)image->segment[i].mem,
59 (unsigned int)image->segment[i].mem +
60 image->segment[i].memsz,
61 (unsigned int)image->segment[i].memsz);
63 printk(" start : 0x%08x\n\n", (unsigned int)image->start);
67 * Do not allocate memory (or fail in any way) in machine_kexec().
68 * We are past the point of no return, committed to rebooting now.
70 void machine_kexec(struct kimage *image)
72 unsigned long page_list;
73 unsigned long reboot_code_buffer;
74 relocate_new_kernel_t rnk;
77 int save_ftrace_enabled;
80 * Nicked from the mips version of machine_kexec():
81 * The generic kexec code builds a page list with physical
82 * addresses. Use phys_to_virt() to convert them to virtual.
84 for (ptr = &image->head; (entry = *ptr) && !(entry & IND_DONE);
85 ptr = (entry & IND_INDIRECTION) ?
86 phys_to_virt(entry & PAGE_MASK) : ptr + 1) {
87 if (*ptr & IND_SOURCE || *ptr & IND_INDIRECTION ||
88 *ptr & IND_DESTINATION)
89 *ptr = (unsigned long) phys_to_virt(*ptr);
92 #ifdef CONFIG_KEXEC_JUMP
93 if (image->preserve_context)
94 save_processor_state();
97 save_ftrace_enabled = __ftrace_enabled_save();
99 /* Interrupts aren't acceptable while we reboot */
102 page_list = image->head;
104 /* we need both effective and real address here */
106 (unsigned long)page_address(image->control_code_page);
108 /* copy our kernel relocation code to the control code page */
109 memcpy((void *)reboot_code_buffer, relocate_new_kernel,
110 relocate_new_kernel_size);
115 sh_bios_vbr_reload();
118 rnk = (relocate_new_kernel_t) reboot_code_buffer;
119 (*rnk)(page_list, reboot_code_buffer,
120 (unsigned long)phys_to_virt(image->start));
122 #ifdef CONFIG_KEXEC_JUMP
123 asm volatile("ldc %0, vbr" : : "r" (&vbr_base) : "memory");
125 if (image->preserve_context)
126 restore_processor_state();
128 /* Convert page list back to physical addresses, what a mess. */
129 for (ptr = &image->head; (entry = *ptr) && !(entry & IND_DONE);
130 ptr = (*ptr & IND_INDIRECTION) ?
131 phys_to_virt(*ptr & PAGE_MASK) : ptr + 1) {
132 if (*ptr & IND_SOURCE || *ptr & IND_INDIRECTION ||
133 *ptr & IND_DESTINATION)
134 *ptr = virt_to_phys(*ptr);
138 __ftrace_enabled_restore(save_ftrace_enabled);
141 void arch_crash_save_vmcoreinfo(void)
144 VMCOREINFO_SYMBOL(node_data);
145 VMCOREINFO_LENGTH(node_data, MAX_NUMNODES);
148 VMCOREINFO_CONFIG(X2TLB);
152 void __init reserve_crashkernel(void)
154 unsigned long long crash_size, crash_base;
157 ret = parse_crashkernel(boot_command_line, memblock_phys_mem_size(),
158 &crash_size, &crash_base);
159 if (ret == 0 && crash_size > 0) {
160 crashk_res.start = crash_base;
161 crashk_res.end = crash_base + crash_size - 1;
164 if (crashk_res.end == crashk_res.start)
167 crash_size = PAGE_ALIGN(resource_size(&crashk_res));
168 if (!crashk_res.start) {
169 unsigned long max = memblock_end_of_DRAM() - memory_limit;
170 crashk_res.start = memblock_phys_alloc_range(crash_size,
172 if (!crashk_res.start) {
173 pr_err("crashkernel allocation failed\n");
177 ret = memblock_reserve(crashk_res.start, crash_size);
178 if (unlikely(ret < 0)) {
179 pr_err("crashkernel reservation failed - "
180 "memory is in use\n");
185 crashk_res.end = crashk_res.start + crash_size - 1;
188 * Crash kernel trumps memory limit
190 if ((memblock_end_of_DRAM() - memory_limit) <= crashk_res.end) {
192 pr_info("Disabled memory limit for crashkernel\n");
195 pr_info("Reserving %ldMB of memory at 0x%08lx "
196 "for crashkernel (System RAM: %ldMB)\n",
197 (unsigned long)(crash_size >> 20),
198 (unsigned long)(crashk_res.start),
199 (unsigned long)(memblock_phys_mem_size() >> 20));
204 crashk_res.start = crashk_res.end = 0;