arch/parisc/kernel/kexec.c

   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
  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
  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
  52 void machine_kexec_cleanup(struct kimage *kimage)
  53 {
  54 }
  55
  56 void machine_crash_shutdown(struct pt_regs *regs)
  57 {
  58 }
  59
  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
  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
 108 int machine_kexec_prepare(struct kimage *image)
 109 {
 110         kexec_image_info(image);
 111         return 0;
 112 }