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