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machine_kexec.c

/*
 * arch/ia64/kernel/machine_kexec.c
 *
 * Handle transition of Linux booting another kernel
 * Copyright (C) 2005 Hewlett-Packard Development Comapny, L.P.
 * Copyright (C) 2005 Khalid Aziz <khalid.aziz@hp.com>
 * Copyright (C) 2006 Intel Corp, Zou Nan hai <nanhai.zou@intel.com>
 *
 * 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/cpu.h>
#include <linux/irq.h>
#include <linux/efi.h>
#include <linux/numa.h>
#include <linux/mmzone.h>

#include <asm/numa.h>
#include <asm/mmu_context.h>
#include <asm/setup.h>
#include <asm/delay.h>
#include <asm/meminit.h>
#include <asm/processor.h>

typedef NORET_TYPE void (*relocate_new_kernel_t)(
                              unsigned long indirection_page,
                              unsigned long start_address,
                              struct ia64_boot_param *boot_param,
                              unsigned long pal_addr) ATTRIB_NORET;

struct kimage *ia64_kimage;

struct resource efi_memmap_res = {
        .name  = "EFI Memory Map",
        .start = 0,
        .end   = 0,
        .flags = IORESOURCE_BUSY | IORESOURCE_MEM
};

struct resource boot_param_res = {
        .name  = "Boot parameter",
        .start = 0,
        .end   = 0,
        .flags = IORESOURCE_BUSY | IORESOURCE_MEM
};


/*
 * 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)
{
      void *control_code_buffer;
      const unsigned long *func;

      func = (unsigned long *)&relocate_new_kernel;
      /* Pre-load control code buffer to minimize work in kexec path */
      control_code_buffer = page_address(image->control_code_page);
      memcpy((void *)control_code_buffer, (const void *)func[0],
                  relocate_new_kernel_size);
      flush_icache_range((unsigned long)control_code_buffer,
                  (unsigned long)control_code_buffer + relocate_new_kernel_size);
      ia64_kimage = image;

      return 0;
}

void machine_kexec_cleanup(struct kimage *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.
 */
static void ia64_machine_kexec(struct unw_frame_info *info, void *arg)
{
      struct kimage *image = arg;
      relocate_new_kernel_t rnk;
      void *pal_addr = efi_get_pal_addr();
      unsigned long code_addr = (unsigned long)page_address(image->control_code_page);
      int ii;

      BUG_ON(!image);
      if (image->type == KEXEC_TYPE_CRASH) {
            crash_save_this_cpu();
            current->thread.ksp = (__u64)info->sw - 16;
      }

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

      /* Mask CMC and Performance Monitor interrupts */
      ia64_setreg(_IA64_REG_CR_PMV, 1 << 16);
      ia64_setreg(_IA64_REG_CR_CMCV, 1 << 16);

      /* Mask ITV and Local Redirect Registers */
      ia64_set_itv(1 << 16);
      ia64_set_lrr0(1 << 16);
      ia64_set_lrr1(1 << 16);

      /* terminate possible nested in-service interrupts */
      for (ii = 0; ii < 16; ii++)
            ia64_eoi();

      /* unmask TPR and clear any pending interrupts */
      ia64_setreg(_IA64_REG_CR_TPR, 0);
      ia64_srlz_d();
      while (ia64_get_ivr() != IA64_SPURIOUS_INT_VECTOR)
            ia64_eoi();
      platform_kernel_launch_event();
      rnk = (relocate_new_kernel_t)&code_addr;
      (*rnk)(image->head, image->start, ia64_boot_param,
                 GRANULEROUNDDOWN((unsigned long) pal_addr));
      BUG();
}

void machine_kexec(struct kimage *image)
{
      BUG_ON(!image);
      unw_init_running(ia64_machine_kexec, image);
      for(;;);
}

void arch_crash_save_vmcoreinfo(void)
{
#if defined(CONFIG_DISCONTIGMEM) || defined(CONFIG_SPARSEMEM)
      VMCOREINFO_SYMBOL(pgdat_list);
      VMCOREINFO_LENGTH(pgdat_list, MAX_NUMNODES);
#endif
#ifdef CONFIG_NUMA
      VMCOREINFO_SYMBOL(node_memblk);
      VMCOREINFO_LENGTH(node_memblk, NR_NODE_MEMBLKS);
      VMCOREINFO_STRUCT_SIZE(node_memblk_s);
      VMCOREINFO_OFFSET(node_memblk_s, start_paddr);
      VMCOREINFO_OFFSET(node_memblk_s, size);
#endif
#ifdef CONFIG_PGTABLE_3
      VMCOREINFO_CONFIG(PGTABLE_3);
#elif  CONFIG_PGTABLE_4
      VMCOREINFO_CONFIG(PGTABLE_4);
#endif
}

unsigned long paddr_vmcoreinfo_note(void)
{
      return ia64_tpa((unsigned long)(char *)&vmcoreinfo_note);
}


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