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
21 int 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
39 int 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
54 int 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 int ret;
61
62 assert(signature);
63 assert(data);
64
65 memcpy(tmp.signature, signature, sizeof(tmp.signature));
66
67 if (ioctl(fd, DBCIOCPARAM, &tmp))
68 return errno;
69
70 *data = tmp.param;
71 memcpy(signature, tmp.signature, sizeof(tmp.signature));
72 return 0;
73 }
74
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