1 // SPDX-License-Identifier: GPL-2.0
2
3 #include <linux/kernel.h>
4 #include <linux/console.h>
5 #include <linux/kexec.h>
6 #include <linux/delay.h>
7 #include <asm/cacheflush.h>
8 #include <asm/sections.h>
9
10 extern void relocate_new_kernel(unsigned long head,
11 unsigned long start,
12 unsigned long phys);
13
14 extern const unsigned int relocate_new_kernel_size;
15 extern unsigned int kexec_initrd_start_offset;
16 extern unsigned int kexec_initrd_end_offset;
17 extern unsigned int kexec_cmdline_offset;
18 extern unsigned int kexec_free_mem_offset;
19
kexec_show_segment_info(const struct kimage * kimage,unsigned long n)20 static void kexec_show_segment_info(const struct kimage *kimage,
21 unsigned long n)
22 {
23 pr_debug(" segment[%lu]: %016lx - %016lx, 0x%lx bytes, %lu pages\n",
24 n,
25 kimage->segment[n].mem,
26 kimage->segment[n].mem + kimage->segment[n].memsz,
27 (unsigned long)kimage->segment[n].memsz,
28 (unsigned long)kimage->segment[n].memsz / PAGE_SIZE);
29 }
30
kexec_image_info(const struct kimage * kimage)31 static void kexec_image_info(const struct kimage *kimage)
32 {
33 unsigned long i;
34
35 pr_debug("kexec kimage info:\n");
36 pr_debug(" type: %d\n", kimage->type);
37 pr_debug(" start: %lx\n", kimage->start);
38 pr_debug(" head: %lx\n", kimage->head);
39 pr_debug(" nr_segments: %lu\n", kimage->nr_segments);
40
41 for (i = 0; i < kimage->nr_segments; i++)
42 kexec_show_segment_info(kimage, i);
43
44 #ifdef CONFIG_KEXEC_FILE
45 if (kimage->file_mode) {
46 pr_debug("cmdline: %.*s\n", (int)kimage->cmdline_buf_len,
47 kimage->cmdline_buf);
48 }
49 #endif
50 }
51
machine_kexec_cleanup(struct kimage * kimage)52 void machine_kexec_cleanup(struct kimage *kimage)
53 {
54 }
55
machine_crash_shutdown(struct pt_regs * regs)56 void machine_crash_shutdown(struct pt_regs *regs)
57 {
58 }
59
machine_shutdown(void)60 void machine_shutdown(void)
61 {
62 smp_send_stop();
63 while (num_online_cpus() > 1) {
64 cpu_relax();
65 mdelay(1);
66 }
67 }
68
machine_kexec(struct kimage * image)69 void machine_kexec(struct kimage *image)
70 {
71 #ifdef CONFIG_64BIT
72 Elf64_Fdesc desc;
73 #endif
74 void (*reloc)(unsigned long head,
75 unsigned long start,
76 unsigned long phys);
77
78 unsigned long phys = page_to_phys(image->control_code_page);
79 void *virt = (void *)__fix_to_virt(FIX_TEXT_KEXEC);
80 struct kimage_arch *arch = &image->arch;
81
82 set_fixmap(FIX_TEXT_KEXEC, phys);
83
84 flush_cache_all();
85
86 #ifdef CONFIG_64BIT
87 reloc = (void *)&desc;
88 desc.addr = (long long)virt;
89 #else
90 reloc = (void *)virt;
91 #endif
92
93 memcpy(virt, dereference_function_descriptor(relocate_new_kernel),
94 relocate_new_kernel_size);
95
96 *(unsigned long *)(virt + kexec_cmdline_offset) = arch->cmdline;
97 *(unsigned long *)(virt + kexec_initrd_start_offset) = arch->initrd_start;
98 *(unsigned long *)(virt + kexec_initrd_end_offset) = arch->initrd_end;
99 *(unsigned long *)(virt + kexec_free_mem_offset) = PAGE0->mem_free;
100
101 flush_cache_all();
102 flush_tlb_all();
103 local_irq_disable();
104
105 reloc(image->head & PAGE_MASK, image->start, phys);
106 }
107
machine_kexec_prepare(struct kimage * image)108 int machine_kexec_prepare(struct kimage *image)
109 {
110 kexec_image_info(image);
111 return 0;
112 }
113