mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-09-25 03:46:17 +00:00
febe3ed322
Add a small shared library that demonstrates the usage of the IOCTL interface. This library can be linked to but, is intended to be loaded and used by higher level languages Acked-by: Tom Lendacky <thomas.lendacky@amd.com> Signed-off-by: Mario Limonciello <mario.limonciello@amd.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
72 lines
1.4 KiB
C
72 lines
1.4 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
/*
|
|
* AMD Secure Processor Dynamic Boost Control sample library
|
|
*
|
|
* Copyright (C) 2023 Advanced Micro Devices, Inc.
|
|
*
|
|
* Author: Mario Limonciello <mario.limonciello@amd.com>
|
|
*/
|
|
|
|
#include <assert.h>
|
|
#include <string.h>
|
|
#include <sys/ioctl.h>
|
|
|
|
/* if uapi header isn't installed, this might not yet exist */
|
|
#ifndef __packed
|
|
#define __packed __attribute__((packed))
|
|
#endif
|
|
#include <linux/psp-dbc.h>
|
|
|
|
int get_nonce(int fd, void *nonce_out, void *signature)
|
|
{
|
|
struct dbc_user_nonce tmp = {
|
|
.auth_needed = !!signature,
|
|
};
|
|
int ret;
|
|
|
|
assert(nonce_out);
|
|
|
|
if (signature)
|
|
memcpy(tmp.signature, signature, sizeof(tmp.signature));
|
|
|
|
ret = ioctl(fd, DBCIOCNONCE, &tmp);
|
|
if (ret)
|
|
return ret;
|
|
memcpy(nonce_out, tmp.nonce, sizeof(tmp.nonce));
|
|
|
|
return 0;
|
|
}
|
|
|
|
int set_uid(int fd, __u8 *uid, __u8 *signature)
|
|
{
|
|
struct dbc_user_setuid tmp;
|
|
|
|
assert(uid);
|
|
assert(signature);
|
|
|
|
memcpy(tmp.uid, uid, sizeof(tmp.uid));
|
|
memcpy(tmp.signature, signature, sizeof(tmp.signature));
|
|
|
|
return ioctl(fd, DBCIOCUID, &tmp);
|
|
}
|
|
|
|
int process_param(int fd, int msg_index, __u8 *signature, int *data)
|
|
{
|
|
struct dbc_user_param tmp = {
|
|
.msg_index = msg_index,
|
|
.param = *data,
|
|
};
|
|
int ret;
|
|
|
|
assert(signature);
|
|
assert(data);
|
|
|
|
memcpy(tmp.signature, signature, sizeof(tmp.signature));
|
|
|
|
ret = ioctl(fd, DBCIOCPARAM, &tmp);
|
|
if (ret)
|
|
return ret;
|
|
|
|
*data = tmp.param;
|
|
return 0;
|
|
}
|