LXR linux/arch/s390/kernel/kexec

   1// SPDX-License-Identifier: GPL-2.0
   2/*
   3 * Image loader for kexec_file_load system call.
   4 *
   5 * Copyright IBM Corp. 2018
   6 *
   7 * Author(s): Philipp Rudo <prudo@linux.vnet.ibm.com>
   8 */
   9
  10#include <linux/errno.h>
  11#include <linux/kernel.h>
  12#include <linux/kexec.h>
  13#include <asm/setup.h>
  14
  15static int kexec_file_add_image_kernel(struct kimage *image,
  16                                       struct s390_load_data *data,
  17                                       char *kernel, unsigned long kernel_len)
  18{
  19        struct kexec_buf buf;
  20        int ret;
  21
  22        buf.image = image;
  23
  24        buf.buffer = kernel + STARTUP_NORMAL_OFFSET;
  25        buf.bufsz = kernel_len - STARTUP_NORMAL_OFFSET;
  26
  27        buf.mem = STARTUP_NORMAL_OFFSET;
  28        if (image->type == KEXEC_TYPE_CRASH)
  29                buf.mem += crashk_res.start;
  30        buf.memsz = buf.bufsz;
  31
  32        ret = kexec_add_buffer(&buf);
  33
  34        data->kernel_buf = kernel;
  35        data->memsz += buf.memsz + STARTUP_NORMAL_OFFSET;
  36
  37        return ret;
  38}
  39
  40static void *s390_image_load(struct kimage *image,
  41                             char *kernel, unsigned long kernel_len,
  42                             char *initrd, unsigned long initrd_len,
  43                             char *cmdline, unsigned long cmdline_len)
  44{
  45        struct s390_load_data data = {0};
  46        int ret;
  47
  48        ret = kexec_file_add_image_kernel(image, &data, kernel, kernel_len);
  49        if (ret)
  50                return ERR_PTR(ret);
  51
  52        if (initrd) {
  53                ret = kexec_file_add_initrd(image, &data, initrd, initrd_len);
  54                if (ret)
  55                        return ERR_PTR(ret);
  56        }
  57
  58        ret = kexec_file_add_purgatory(image, &data);
  59        if (ret)
  60                return ERR_PTR(ret);
  61
  62        return kexec_file_update_kernel(image, &data);
  63}
  64
  65static int s390_image_probe(const char *buf, unsigned long len)
  66{
  67        /* Can't reliably tell if an image is valid.  Therefore give the
  68         * user whatever he wants.
  69         */
  70        return 0;
  71}
  72
  73const struct kexec_file_ops s390_kexec_image_ops = {
  74        .probe = s390_image_probe,
  75        .load = s390_image_load,
  76};
  77