1// SPDX-License-Identifier: GPL-2.0-only
 2/*
 3 * AMD Secure Processor Dynamic Boost Control sample library
 4 *
 5 * Copyright (C) 2023 Advanced Micro Devices, Inc.
 6 *
 7 * Author: Mario Limonciello <mario.limonciello@amd.com>
 8 */
 9
10#include <assert.h>
11#include <errno.h>
12#include <string.h>
13#include <sys/ioctl.h>
14
15/* if uapi header isn't installed, this might not yet exist */
16#ifndef __packed
17#define __packed __attribute__((packed))
18#endif
19#include <linux/psp-dbc.h>
20
21int get_nonce(int fd, void *nonce_out, void *signature)
22{
23	struct dbc_user_nonce tmp = {
24		.auth_needed = !!signature,
25	};
26
27	assert(nonce_out);
28
29	if (signature)
30		memcpy(tmp.signature, signature, sizeof(tmp.signature));
31
32	if (ioctl(fd, DBCIOCNONCE, &tmp))
33		return errno;
34	memcpy(nonce_out, tmp.nonce, sizeof(tmp.nonce));
35
36	return 0;
37}
38
39int set_uid(int fd, __u8 *uid, __u8 *signature)
40{
41	struct dbc_user_setuid tmp;
42
43	assert(uid);
44	assert(signature);
45
46	memcpy(tmp.uid, uid, sizeof(tmp.uid));
47	memcpy(tmp.signature, signature, sizeof(tmp.signature));
48
49	if (ioctl(fd, DBCIOCUID, &tmp))
50		return errno;
51	return 0;
52}
53
54int process_param(int fd, int msg_index, __u8 *signature, int *data)
55{
56	struct dbc_user_param tmp = {
57		.msg_index = msg_index,
58		.param = *data,
59	};
60
61	assert(signature);
62	assert(data);
63
64	memcpy(tmp.signature, signature, sizeof(tmp.signature));
65
66	if (ioctl(fd, DBCIOCPARAM, &tmp))
67		return errno;
68
69	*data = tmp.param;
70	memcpy(signature, tmp.signature, sizeof(tmp.signature));
71	return 0;
72}