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 <string.h> 12 #include <sys/ioctl.h> 13 14 /* if uapi header isn't installed, this might not yet exist */ 15 #ifndef __packed 16 #define __packed __attribute__((packed)) 17 #endif 18 #include <linux/psp-dbc.h> 19 20 int get_nonce(int fd, void *nonce_out, void *signature) 21 { 22 struct dbc_user_nonce tmp = { 23 .auth_needed = !!signature, 24 }; 25 int ret; 26 27 assert(nonce_out); 28 29 if (signature) 30 memcpy(tmp.signature, signature, sizeof(tmp.signature)); 31 32 ret = ioctl(fd, DBCIOCNONCE, &tmp); 33 if (ret) 34 return ret; 35 memcpy(nonce_out, tmp.nonce, sizeof(tmp.nonce)); 36 37 return 0; 38 } 39 40 int set_uid(int fd, __u8 *uid, __u8 *signature) 41 { 42 struct dbc_user_setuid tmp; 43 44 assert(uid); 45 assert(signature); 46 47 memcpy(tmp.uid, uid, sizeof(tmp.uid)); 48 memcpy(tmp.signature, signature, sizeof(tmp.signature)); 49 50 return ioctl(fd, DBCIOCUID, &tmp); 51 } 52 53 int process_param(int fd, int msg_index, __u8 *signature, int *data) 54 { 55 struct dbc_user_param tmp = { 56 .msg_index = msg_index, 57 .param = *data, 58 }; 59 int ret; 60 61 assert(signature); 62 assert(data); 63 64 memcpy(tmp.signature, signature, sizeof(tmp.signature)); 65 66 ret = ioctl(fd, DBCIOCPARAM, &tmp); 67 if (ret) 68 return ret; 69 70 *data = tmp.param; 71 return 0; 72 } 73