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};