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machine_kexec.c

/*
 * machine_kexec.c - handle transition of Linux booting another kernel
 */

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

extern const unsigned char relocate_new_kernel[];
extern const unsigned int relocate_new_kernel_size;

extern void setup_mm_for_reboot(char mode);

extern unsigned long kexec_start_address;
extern unsigned long kexec_indirection_page;
extern unsigned long kexec_mach_type;
extern unsigned long kexec_boot_atags;

static atomic_t waiting_for_crash_ipi;

/*
 * Provide a dummy crash_notes definition while crash dump arrives to arm.
 * This prevents breakage of crash_notes attribute in kernel/ksysfs.c.
 */

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

void machine_kexec_cleanup(struct kimage *image)
{
}

void machine_crash_nonpanic_core(void *unused)
{
      struct pt_regs regs;

      crash_setup_regs(&regs, NULL);
      printk(KERN_DEBUG "CPU %u will stop doing anything useful since another CPU has crashed\n",
             smp_processor_id());
      crash_save_cpu(&regs, smp_processor_id());
      flush_cache_all();

      atomic_dec(&waiting_for_crash_ipi);
      while (1)
            cpu_relax();
}

void machine_crash_shutdown(struct pt_regs *regs)
{
      unsigned long msecs;

      local_irq_disable();

      atomic_set(&waiting_for_crash_ipi, num_online_cpus() - 1);
      smp_call_function(machine_crash_nonpanic_core, NULL, false);
      msecs = 1000; /* Wait at most a second for the other cpus to stop */
      while ((atomic_read(&waiting_for_crash_ipi) > 0) && msecs) {
            mdelay(1);
            msecs--;
      }
      if (atomic_read(&waiting_for_crash_ipi) > 0)
            printk(KERN_WARNING "Non-crashing CPUs did not react to IPI\n");

      crash_save_cpu(regs, smp_processor_id());

      printk(KERN_INFO "Loading crashdump kernel...\n");
}

void machine_kexec(struct kimage *image)
{
      unsigned long page_list;
      unsigned long reboot_code_buffer_phys;
      void *reboot_code_buffer;


      page_list = image->head & PAGE_MASK;

      /* we need both effective and real address here */
      reboot_code_buffer_phys =
          page_to_pfn(image->control_code_page) << PAGE_SHIFT;
      reboot_code_buffer = page_address(image->control_code_page);

      /* Prepare parameters for reboot_code_buffer*/
      kexec_start_address = image->start;
      kexec_indirection_page = page_list;
      kexec_mach_type = machine_arch_type;
      kexec_boot_atags = image->start - KEXEC_ARM_ZIMAGE_OFFSET + KEXEC_ARM_ATAGS_OFFSET;

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


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

      local_irq_disable();
      local_fiq_disable();
      setup_mm_for_reboot(0); /* mode is not used, so just pass 0*/
      flush_cache_all();
      outer_flush_all();
      outer_disable();
      cpu_proc_fin();
      outer_inv_all();
      flush_cache_all();
      cpu_reset(reboot_code_buffer_phys);
}

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