tools/crypto/ccp/dbc.c

   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
  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 }