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machine_kexec.c

/*
 * Code to handle transition of 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/reboot.h>
#include <linux/threads.h>
#include <linux/lmb.h>
#include <asm/machdep.h>
#include <asm/prom.h>

void machine_crash_shutdown(struct pt_regs *regs)
{
      if (ppc_md.machine_crash_shutdown)
            ppc_md.machine_crash_shutdown(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)
{
      if (ppc_md.machine_kexec_prepare)
            return ppc_md.machine_kexec_prepare(image);
      /*
       * Fail if platform doesn't provide its own machine_kexec_prepare
       * implementation.
       */
      return -ENOSYS;
}

void machine_kexec_cleanup(struct kimage *image)
{
      if (ppc_md.machine_kexec_cleanup)
            ppc_md.machine_kexec_cleanup(image);
}

/*
 * 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)
{
      if (ppc_md.machine_kexec)
            ppc_md.machine_kexec(image);
      else {
            /*
             * Fall back to normal restart if platform doesn't provide
             * its own kexec function, and user insist to kexec...
             */
            machine_restart(NULL);
      }
      for(;;);
}

void __init reserve_crashkernel(void)
{
      unsigned long long crash_size, crash_base;
      int ret;

      /* this is necessary because of lmb_phys_mem_size() */
      lmb_analyze();

      /* use common parsing */
      ret = parse_crashkernel(boot_command_line, lmb_phys_mem_size(),
                  &crash_size, &crash_base);
      if (ret == 0 && crash_size > 0) {
            crashk_res.start = crash_base;
            crashk_res.end = crash_base + crash_size - 1;
      }

      if (crashk_res.end == crashk_res.start) {
            crashk_res.start = crashk_res.end = 0;
            return;
      }

      /* We might have got these values via the command line or the
       * device tree, either way sanitise them now. */

      crash_size = crashk_res.end - crashk_res.start + 1;

#ifndef CONFIG_RELOCATABLE
      if (crashk_res.start != KDUMP_KERNELBASE)
            printk("Crash kernel location must be 0x%x\n",
                        KDUMP_KERNELBASE);

      crashk_res.start = KDUMP_KERNELBASE;
#endif
      crash_size = PAGE_ALIGN(crash_size);
      crashk_res.end = crashk_res.start + crash_size - 1;

      /* Crash kernel trumps memory limit */
      if (memory_limit && memory_limit <= crashk_res.end) {
            memory_limit = crashk_res.end + 1;
            printk("Adjusted memory limit for crashkernel, now 0x%lx\n",
                        memory_limit);
      }

      printk(KERN_INFO "Reserving %ldMB of memory at %ldMB "
                  "for crashkernel (System RAM: %ldMB)\n",
                  (unsigned long)(crash_size >> 20),
                  (unsigned long)(crashk_res.start >> 20),
                  (unsigned long)(lmb_phys_mem_size() >> 20));

      lmb_reserve(crashk_res.start, crash_size);
}

int overlaps_crashkernel(unsigned long start, unsigned long size)
{
      return (start + size) > crashk_res.start && start <= crashk_res.end;
}

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