machine_kexec_32.c

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/*
 * PPC32 code to handle Linux booting another kernel.
 *
 * Copyright (C) 2002-2003 Eric Biederman  <[email protected]>
 * 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/mm.h>
#include <linux/string.h>
#include <asm/cacheflush.h>
#include <asm/hw_irq.h>
#include <asm/io.h>

typedef void (*relocate_new_kernel_t)(
                unsigned long indirection_page,
                unsigned long reboot_code_buffer,
                unsigned long start_address) __noreturn;

/*
 * This is a generic machine_kexec function suitable at least for
 * non-OpenFirmware embedded platforms.
 * It merely copies the image relocation code to the control page and
 * jumps to it.
 * A platform specific function may just call this one.
 */
void default_machine_kexec(struct kimage *image)
{
    extern const unsigned char relocate_new_kernel[];
    extern const unsigned int relocate_new_kernel_size;
    unsigned long page_list;
    unsigned long reboot_code_buffer, reboot_code_buffer_phys;
    relocate_new_kernel_t rnk;

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

    /* mask each interrupt so we are in a more sane state for the
     * kexec kernel */
    machine_kexec_mask_interrupts();

    page_list = image->head;

    /* we need both effective and real address here */
    reboot_code_buffer =
            (unsigned long)page_address(image->control_code_page);
    reboot_code_buffer_phys = virt_to_phys((void *)reboot_code_buffer);

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

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

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

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