arch/sh/kernel/machine_kexec.c

   1 /*
   2  * machine_kexec.c - handle transition of Linux booting another kernel
   3  * Copyright (C) 2002-2003 Eric Biederman  <ebiederm@xmission.com>
   4  *
   5  * GameCube/ppc32 port Copyright (C) 2004 Albert Herranz
   6  * LANDISK/sh4 supported by kogiidena
   7  *
   8  * This source code is licensed under the GNU General Public License,
   9  * Version 2.  See the file COPYING for more details.
  10  */
  11
  12 #include <linux/mm.h>
  13 #include <linux/kexec.h>
  14 #include <linux/delay.h>
  15 #include <linux/reboot.h>
  16 #include <linux/numa.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
  23 typedef NORET_TYPE void (*relocate_new_kernel_t)(
  24                                 unsigned long indirection_page,
  25                                 unsigned long reboot_code_buffer,
  26                                 unsigned long start_address,
  27                                 unsigned long vbr_reg) ATTRIB_NORET;
  28
  29 extern const unsigned char relocate_new_kernel[];
  30 extern const unsigned int relocate_new_kernel_size;
  31 extern void *gdb_vbr_vector;
  32
  33 void machine_shutdown(void)
  34 {
  35 }
  36
  37 void machine_crash_shutdown(struct pt_regs *regs)
  38 {
  39 }
  40
  41 /*
  42  * Do what every setup is needed on image and the
  43  * reboot code buffer to allow us to avoid allocations
  44  * later.
  45  */
  46 int machine_kexec_prepare(struct kimage *image)
  47 {
  48         return 0;
  49 }
  50
  51 void machine_kexec_cleanup(struct kimage *image)
  52 {
  53 }
  54
  55 static void kexec_info(struct kimage *image)
  56 {
  57         int i;
  58         printk("kexec information\n");
  59         for (i = 0; i < image->nr_segments; i++) {
  60                 printk("  segment[%d]: 0x%08x - 0x%08x (0x%08x)\n",
  61                        i,
  62                        (unsigned int)image->segment[i].mem,
  63                        (unsigned int)image->segment[i].mem +
  64                                      image->segment[i].memsz,
  65                        (unsigned int)image->segment[i].memsz);
  66         }
  67         printk("  start     : 0x%08x\n\n", (unsigned int)image->start);
  68 }
  69
  70 /*
  71  * Do not allocate memory (or fail in any way) in machine_kexec().
  72  * We are past the point of no return, committed to rebooting now.
  73  */
  74 void machine_kexec(struct kimage *image)
  75 {
  76
  77         unsigned long page_list;
  78         unsigned long reboot_code_buffer;
  79         unsigned long vbr_reg;
  80         relocate_new_kernel_t rnk;
  81
  82 #if defined(CONFIG_SH_STANDARD_BIOS)
  83         vbr_reg = ((unsigned long )gdb_vbr_vector) - 0x100;
  84 #else
  85         vbr_reg = 0x80000000;  // dummy
  86 #endif
  87         /* Interrupts aren't acceptable while we reboot */
  88         local_irq_disable();
  89
  90         page_list = image->head;
  91
  92         /* we need both effective and real address here */
  93         reboot_code_buffer =
  94                         (unsigned long)page_address(image->control_code_page);
  95
  96         /* copy our kernel relocation code to the control code page */
  97         memcpy((void *)reboot_code_buffer, relocate_new_kernel,
  98                                                 relocate_new_kernel_size);
  99
 100         kexec_info(image);
 101         flush_cache_all();
 102
 103         /* now call it */
 104         rnk = (relocate_new_kernel_t) reboot_code_buffer;
 105         (*rnk)(page_list, reboot_code_buffer, P2SEGADDR(image->start), vbr_reg);
 106 }
 107
 108 void arch_crash_save_vmcoreinfo(void)
 109 {
 110 #ifdef CONFIG_NUMA
 111         VMCOREINFO_SYMBOL(node_data);
 112         VMCOREINFO_LENGTH(node_data, MAX_NUMNODES);
 113 #endif
 114 }