// SPDX-License-Identifier: BSD-2-Clause
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/*
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* Copyright (c) 2021 Rockchip Electronics Co. Ltd.
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*/
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#include <tee_internal_api.h>
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#include <tee_internal_api_extensions.h>
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#include "rk_trng_api.h"
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#include "rk_os_service.h"
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/*
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* RK356x, RK3399 platform supported.
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* Not all platform supports this API. When not supports, it will returns
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* TEE_ERROR_NOT_SUPPORTED.
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*/
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TEE_Result rk_get_trng(uint8_t *buffer, uint32_t size)
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{
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TEE_Result res = TEE_SUCCESS;
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uint32_t param_type;
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TEE_Param params[4];
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TEE_TASessionHandle session = TEE_HANDLE_NULL;
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uint32_t error_origin = 0;
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TEE_UUID uuid = RK_OS_SERVICE_UUID;
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param_type = TEE_PARAM_TYPES(TEE_PARAM_TYPE_NONE, TEE_PARAM_TYPE_NONE,
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TEE_PARAM_TYPE_NONE, TEE_PARAM_TYPE_NONE);
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res = TEE_OpenTASession(&uuid, 0, param_type, params,
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&session, &error_origin);
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if (res != TEE_SUCCESS) {
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EMSG("TEE_OpenTASession failed with code 0x%x origin 0x%x",
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res, error_origin);
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session = TEE_HANDLE_NULL;
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return res;
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}
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param_type = TEE_PARAM_TYPES(TEE_PARAM_TYPE_VALUE_INOUT,
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TEE_PARAM_TYPE_NONE,
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TEE_PARAM_TYPE_NONE,
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TEE_PARAM_TYPE_NONE);
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TEE_MemFill(params, 0, sizeof(params));
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params[0].value.a = (uint32_t)buffer;
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params[0].value.b = size;
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res = TEE_InvokeTACommand(session, 0, OS_SERVICE_CMD_GET_TRNG,
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param_type, params, &error_origin);
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if (res != TEE_SUCCESS)
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EMSG("TEE_InvokeTACommand failed with code 0x%x origin 0x%x\n",
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res, error_origin);
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TEE_CloseTASession(session);
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session = TEE_HANDLE_NULL;
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return res;
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}
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