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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * AMD Secure Processor Dynamic Boost Control sample library4 *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 __packed17#define __packed __attribute__((packed))18#endif19#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