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// SPDX-License-Identifier: BSD-2-Clause
/*
* Copyright (C) 2018, Linaro Limited
* Copyright (c) 2021, EPAM Systems. All rights reserved.
*
* Based on plat-synquacer/rng_pta.c
*
*/
#include <kernel/pseudo_ta.h>
#include <rng_pta_client.h>
#include <rng_support.h>
#define PTA_NAME "rng.pta"
static TEE_Result rng_get_entropy(uint32_t types,
TEE_Param params[TEE_NUM_PARAMS])
{
uint8_t *e = NULL;
uint32_t i = 0;
if (types != TEE_PARAM_TYPES(TEE_PARAM_TYPE_MEMREF_INOUT,
TEE_PARAM_TYPE_NONE,
TEE_PARAM_TYPE_NONE,
TEE_PARAM_TYPE_NONE)) {
DMSG("bad parameters types: 0x%" PRIx32, types);
return TEE_ERROR_BAD_PARAMETERS;
}
e = (uint8_t *)params[0].memref.buffer;
if (!e)
return TEE_ERROR_BAD_PARAMETERS;
for (i = 0; i < params[0].memref.size; i++)
e[i] = hw_get_random_byte();
return TEE_SUCCESS;
}
static TEE_Result rng_get_info(uint32_t types,
TEE_Param params[TEE_NUM_PARAMS])
{
if (types != TEE_PARAM_TYPES(TEE_PARAM_TYPE_VALUE_OUTPUT,
TEE_PARAM_TYPE_NONE,
TEE_PARAM_TYPE_NONE,
TEE_PARAM_TYPE_NONE)) {
DMSG("bad parameters types: 0x%" PRIx32, types);
return TEE_ERROR_BAD_PARAMETERS;
}
params[0].value.a = CFG_HWRNG_RATE;
params[0].value.b = CFG_HWRNG_QUALITY;
return TEE_SUCCESS;
}
static TEE_Result invoke_command(void *session __unused,
uint32_t cmd, uint32_t ptypes,
TEE_Param params[TEE_NUM_PARAMS])
{
FMSG(PTA_NAME" command %#"PRIx32" ptypes %#"PRIx32, cmd, ptypes);
switch (cmd) {
case PTA_CMD_GET_ENTROPY:
return rng_get_entropy(ptypes, params);
case PTA_CMD_GET_RNG_INFO:
return rng_get_info(ptypes, params);
default:
break;
}
return TEE_ERROR_NOT_IMPLEMENTED;
}
pseudo_ta_register(.uuid = PTA_RNG_UUID, .name = PTA_NAME,
.flags = PTA_DEFAULT_FLAGS | TA_FLAG_CONCURRENT |
TA_FLAG_DEVICE_ENUM,
.invoke_command_entry_point = invoke_command);
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