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/ipl.h>
14#include <asm/setup.h>
15
16static int kexec_file_add_kernel_image(struct kimage *image,
17				       struct s390_load_data *data)
18{
19	struct kexec_buf buf;
20
21	buf.image = image;
22
23	buf.buffer = image->kernel_buf;
24	buf.bufsz = image->kernel_buf_len;
25
26	buf.mem = 0;
27#ifdef CONFIG_CRASH_DUMP
28	if (image->type == KEXEC_TYPE_CRASH)
29		buf.mem += crashk_res.start;
30#endif
31	buf.memsz = buf.bufsz;
32
33	data->kernel_buf = image->kernel_buf;
34	data->kernel_mem = buf.mem;
35	data->parm = image->kernel_buf + PARMAREA;
36	data->memsz += buf.memsz;
37
38	ipl_report_add_component(data->report, &buf,
39				 IPL_RB_COMPONENT_FLAG_SIGNED |
40				 IPL_RB_COMPONENT_FLAG_VERIFIED,
41				 IPL_RB_CERT_UNKNOWN);
42	return kexec_add_buffer(&buf);
43}
44
45static void *s390_image_load(struct kimage *image,
46			     char *kernel, unsigned long kernel_len,
47			     char *initrd, unsigned long initrd_len,
48			     char *cmdline, unsigned long cmdline_len)
49{
50	return kexec_file_add_components(image, kexec_file_add_kernel_image);
51}
52
53static int s390_image_probe(const char *buf, unsigned long len)
54{
55	/* Can't reliably tell if an image is valid.  Therefore give the
56	 * user whatever he wants.
57	 */
58	return 0;
59}
60
61const struct kexec_file_ops s390_kexec_image_ops = {
62	.probe = s390_image_probe,
63	.load = s390_image_load,
64#ifdef CONFIG_KEXEC_SIG
65	.verify_sig = s390_verify_sig,
66#endif /* CONFIG_KEXEC_SIG */
67};
68