LXR linux/arch/powerpc/kernel/machine_kexec

   1/*
   2 * PPC32 code to handle Linux booting another kernel.
   3 *
   4 * Copyright (C) 2002-2003 Eric Biederman  <ebiederm@xmission.com>
   5 * GameCube/ppc32 port Copyright (C) 2004 Albert Herranz
   6 * Copyright (C) 2005 IBM Corporation.
   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/kexec.h>
  13#include <linux/mm.h>
  14#include <linux/string.h>
  15#include <asm/cacheflush.h>
  16#include <asm/hw_irq.h>
  17#include <asm/io.h>
  18
  19typedef NORET_TYPE void (*relocate_new_kernel_t)(
  20                                unsigned long indirection_page,
  21                                unsigned long reboot_code_buffer,
  22                                unsigned long start_address) ATTRIB_NORET;
  23
  24/*
  25 * This is a generic machine_kexec function suitable at least for
  26 * non-OpenFirmware embedded platforms.
  27 * It merely copies the image relocation code to the control page and
  28 * jumps to it.
  29 * A platform specific function may just call this one.
  30 */
  31void default_machine_kexec(struct kimage *image)
  32{
  33        extern const unsigned char relocate_new_kernel[];
  34        extern const unsigned int relocate_new_kernel_size;
  35        unsigned long page_list;
  36        unsigned long reboot_code_buffer, reboot_code_buffer_phys;
  37        relocate_new_kernel_t rnk;
  38
  39        /* Interrupts aren't acceptable while we reboot */
  40        local_irq_disable();
  41
  42        page_list = image->head;
  43
  44        /* we need both effective and real address here */
  45        reboot_code_buffer =
  46                        (unsigned long)page_address(image->control_code_page);
  47        reboot_code_buffer_phys = virt_to_phys((void *)reboot_code_buffer);
  48
  49        /* copy our kernel relocation code to the control code page */
  50        memcpy((void *)reboot_code_buffer, relocate_new_kernel,
  51                                                relocate_new_kernel_size);
  52
  53        flush_icache_range(reboot_code_buffer,
  54                                reboot_code_buffer + KEXEC_CONTROL_PAGE_SIZE);
  55        printk(KERN_INFO "Bye!\n");
  56
  57        /* now call it */
  58        rnk = (relocate_new_kernel_t) reboot_code_buffer;
  59        (*rnk)(page_list, reboot_code_buffer_phys, image->start);
  60}
  61
  62int default_machine_kexec_prepare(struct kimage *image)
  63{
  64        return 0;
  65}
  66