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machine_kexec_32.c

/*
 * PPC32 code to handle Linux booting another kernel.
 *
 * Copyright (C) 2002-2003 Eric Biederman  <ebiederm@xmission.com>
 * GameCube/ppc32 port Copyright (C) 2004 Albert Herranz
 * Copyright (C) 2005 IBM Corporation.
 *
 * This source code is licensed under the GNU General Public License,
 * Version 2.  See the file COPYING for more details.
 */

#include <linux/kexec.h>
#include <linux/mm.h>
#include <linux/string.h>
#include <asm/cacheflush.h>
#include <asm/hw_irq.h>
#include <asm/io.h>

typedef NORET_TYPE void (*relocate_new_kernel_t)(
                        unsigned long indirection_page,
                        unsigned long reboot_code_buffer,
                        unsigned long start_address) ATTRIB_NORET;

/*
 * This is a generic machine_kexec function suitable at least for
 * non-OpenFirmware embedded platforms.
 * It merely copies the image relocation code to the control page and
 * jumps to it.
 * A platform specific function may just call this one.
 */
void default_machine_kexec(struct kimage *image)
{
      extern const unsigned char relocate_new_kernel[];
      extern const unsigned int relocate_new_kernel_size;
      unsigned long page_list;
      unsigned long reboot_code_buffer, reboot_code_buffer_phys;
      relocate_new_kernel_t rnk;

      /* Interrupts aren't acceptable while we reboot */
      local_irq_disable();

      page_list = image->head;

      /* we need both effective and real address here */
      reboot_code_buffer =
                  (unsigned long)page_address(image->control_code_page);
      reboot_code_buffer_phys = virt_to_phys((void *)reboot_code_buffer);

      /* copy our kernel relocation code to the control code page */
      memcpy((void *)reboot_code_buffer, relocate_new_kernel,
                                    relocate_new_kernel_size);

      flush_icache_range(reboot_code_buffer,
                        reboot_code_buffer + KEXEC_CONTROL_PAGE_SIZE);
      printk(KERN_INFO "Bye!\n");

      /* now call it */
      rnk = (relocate_new_kernel_t) reboot_code_buffer;
      (*rnk)(page_list, reboot_code_buffer_phys, image->start);
}

int default_machine_kexec_prepare(struct kimage *image)
{
      return 0;
}

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