Root/arch/s390/kernel/machine_kexec.c

1/*
2 * arch/s390/kernel/machine_kexec.c
3 *
4 * Copyright IBM Corp. 2005,2006
5 *
6 * Author(s): Rolf Adelsberger,
7 * Heiko Carstens <heiko.carstens@de.ibm.com>
8 */
9
10#include <linux/device.h>
11#include <linux/mm.h>
12#include <linux/kexec.h>
13#include <linux/delay.h>
14#include <linux/reboot.h>
15#include <asm/cio.h>
16#include <asm/setup.h>
17#include <asm/pgtable.h>
18#include <asm/pgalloc.h>
19#include <asm/system.h>
20#include <asm/smp.h>
21#include <asm/reset.h>
22#include <asm/ipl.h>
23
24typedef void (*relocate_kernel_t)(kimage_entry_t *, unsigned long);
25
26extern const unsigned char relocate_kernel[];
27extern const unsigned long long relocate_kernel_len;
28
29int machine_kexec_prepare(struct kimage *image)
30{
31    void *reboot_code_buffer;
32
33    /* Can't replace kernel image since it is read-only. */
34    if (ipl_flags & IPL_NSS_VALID)
35        return -ENOSYS;
36
37    /* We don't support anything but the default image type for now. */
38    if (image->type != KEXEC_TYPE_DEFAULT)
39        return -EINVAL;
40
41    /* Get the destination where the assembler code should be copied to.*/
42    reboot_code_buffer = (void *) page_to_phys(image->control_code_page);
43
44    /* Then copy it */
45    memcpy(reboot_code_buffer, relocate_kernel, relocate_kernel_len);
46    return 0;
47}
48
49void machine_kexec_cleanup(struct kimage *image)
50{
51}
52
53void machine_shutdown(void)
54{
55}
56
57static void __machine_kexec(void *data)
58{
59    relocate_kernel_t data_mover;
60    struct kimage *image = data;
61
62    pfault_fini();
63    s390_reset_system();
64
65    data_mover = (relocate_kernel_t) page_to_phys(image->control_code_page);
66
67    /* Call the moving routine */
68    (*data_mover)(&image->head, image->start);
69    for (;;);
70}
71
72void machine_kexec(struct kimage *image)
73{
74    smp_send_stop();
75    smp_switch_to_ipl_cpu(__machine_kexec, image);
76}
77

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