machine_kexec.c

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/*
 * machine_kexec.c for kexec
 * Created by <[email protected]> on Thu Oct 12 15:15:06 2006
 *
 * 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/delay.h>

#include <asm/cacheflush.h>
#include <asm/page.h>

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

extern unsigned long kexec_start_address;
extern unsigned long kexec_indirection_page;

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

void
machine_kexec_cleanup(struct kimage *kimage)
{
}

void
machine_shutdown(void)
{
}

void
machine_crash_shutdown(struct pt_regs *regs)
{
}

typedef void (*noretfun_t)(void) __attribute__((noreturn));

void
machine_kexec(struct kimage *image)
{
    unsigned long reboot_code_buffer;
    unsigned long entry;
    unsigned long *ptr;

    reboot_code_buffer =
      (unsigned long)page_address(image->control_code_page);

    kexec_start_address = image->start;
    kexec_indirection_page =
        (unsigned long) phys_to_virt(image->head & PAGE_MASK);

    memcpy((void*)reboot_code_buffer, relocate_new_kernel,
           relocate_new_kernel_size);

    /*
     * The generic kexec code builds a page list with physical
     * addresses. they are directly accessible through KSEG0 (or
     * CKSEG0 or XPHYS if on 64bit system), hence the
     * pys_to_virt() call.
     */
    for (ptr = &image->head; (entry = *ptr) && !(entry &IND_DONE);
         ptr = (entry & IND_INDIRECTION) ?
           phys_to_virt(entry & PAGE_MASK) : ptr + 1) {
        if (*ptr & IND_SOURCE || *ptr & IND_INDIRECTION ||
            *ptr & IND_DESTINATION)
            *ptr = (unsigned long) phys_to_virt(*ptr);
    }

    /*
     * we do not want to be bothered.
     */
    local_irq_disable();

    printk("Will call new kernel at %08lx\n", image->start);
    printk("Bye ...\n");
    __flush_cache_all();
    ((noretfun_t) reboot_code_buffer)();
}