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}
73

source code of linux/tools/crypto/ccp/dbc.c