arch/s390/kernel/kexec_image.c

   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
  15 static 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
  40 static 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
  65 static 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
  73 const struct kexec_file_ops s390_kexec_image_ops = {
  74         .probe = s390_image_probe,
  75         .load = s390_image_load,
  76 };