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machine_kexec.c

/*
 * machine_kexec.c - handle transition of Linux booting another kernel
 * Copyright (C) 2002-2003 Eric Biederman  <ebiederm@xmission.com>
 *
 * GameCube/ppc32 port Copyright (C) 2004 Albert Herranz
 * LANDISK/sh4 supported by kogiidena
 *
 * This source code is licensed under the GNU General Public License,
 * Version 2.  See the file COPYING for more details.
 */

#include <linux/mm.h>
#include <linux/kexec.h>
#include <linux/delay.h>
#include <linux/reboot.h>
#include <linux/numa.h>
#include <asm/pgtable.h>
#include <asm/pgalloc.h>
#include <asm/mmu_context.h>
#include <asm/io.h>
#include <asm/cacheflush.h>

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

extern const unsigned char relocate_new_kernel[];
extern const unsigned int relocate_new_kernel_size;
extern void *gdb_vbr_vector;

void machine_shutdown(void)
{
}

void machine_crash_shutdown(struct pt_regs *regs)
{
}

/*
 * Do what every setup is needed on image and the
 * reboot code buffer to allow us to avoid allocations
 * later.
 */
int machine_kexec_prepare(struct kimage *image)
{
      return 0;
}

void machine_kexec_cleanup(struct kimage *image)
{
}

static void kexec_info(struct kimage *image)
{
        int i;
      printk("kexec information\n");
      for (i = 0; i < image->nr_segments; i++) {
              printk("  segment[%d]: 0x%08x - 0x%08x (0x%08x)\n",
                   i,
                   (unsigned int)image->segment[i].mem,
                   (unsigned int)image->segment[i].mem +
                             image->segment[i].memsz,
                   (unsigned int)image->segment[i].memsz);
      }
      printk("  start     : 0x%08x\n\n", (unsigned int)image->start);
}

/*
 * Do not allocate memory (or fail in any way) in machine_kexec().
 * We are past the point of no return, committed to rebooting now.
 */
void machine_kexec(struct kimage *image)
{

      unsigned long page_list;
      unsigned long reboot_code_buffer;
      unsigned long vbr_reg;
      relocate_new_kernel_t rnk;

#if defined(CONFIG_SH_STANDARD_BIOS)
      vbr_reg = ((unsigned long )gdb_vbr_vector) - 0x100;
#else
      vbr_reg = 0x80000000;  // dummy
#endif
      /* 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);

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

        kexec_info(image);
      flush_cache_all();

      /* now call it */
      rnk = (relocate_new_kernel_t) reboot_code_buffer;
      (*rnk)(page_list, reboot_code_buffer, P2SEGADDR(image->start), vbr_reg);
}

void arch_crash_save_vmcoreinfo(void)
{
#ifdef CONFIG_NUMA
      VMCOREINFO_SYMBOL(node_data);
      VMCOREINFO_LENGTH(node_data, MAX_NUMNODES);
#endif
}

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