/* * Copyright (c) 2017, ARM Limited, All Rights Reserved * SPDX-License-Identifier: Apache-2.0 * * Licensed under the Apache License, Version 2.0 (the "License"); you may * not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ #ifndef __UVISOR_API_IPC_H__ #define __UVISOR_API_IPC_H__ #include "api/inc/ipc_exports.h" #include "api/inc/uvisor_exports.h" #include <stdint.h> #include <stddef.h> /** Wait for any of the specified IPC operations to complete. * * @note This function currently spins, burning through power. * * @param[in] wait_tokens a bitfield of tokens to wait on * @param[out] done_tokens a bitfield which tokens completed * @param[in] timeout_ms how long to wait (in ms) for an IPC operation * before returning. 0 means don't wait at all. Any * other value means wait forever. * @return 0 on success, non-zero error code otherwise */ UVISOR_EXTERN int ipc_waitforany(uint32_t wait_tokens, uint32_t * done_tokens, uint32_t timeout_ms); /** Wait for all of the specified IPC operations to complete. * * @note This function currently spins, burning through power. * * @param[in] wait_tokens a bitfield of tokens to wait on * @param[out] done_tokens a bitfield which tokens completed * @param[in] timeout_ms how long to wait (in ms) for an IPC operation * before returning. 0 means don't wait at all. * Any other value means wait forever. * @return 0 on success, non-zero error code otherwise */ UVISOR_EXTERN int ipc_waitforall(uint32_t wait_tokens, uint32_t * done_tokens, uint32_t timeout_ms); /** Asynchronously send an IPC message * * @note The memory used for receiving the message (pointed to by msg) and the * IPC descriptor (pointed to by desc) must be valid until after the send is * complete. In addition, each IPC message should use its own IPC descriptor. * Reusing an IPC descriptor will lead to unpredictable behaviours. * * @param[inout] desc an IPC descriptor for the message * @param[in] msg the message to send * * @return 0 on success, non-zero error code otherwise * */ UVISOR_EXTERN int ipc_send(uvisor_ipc_desc_t * desc, const void * msg); /** Asynchronously receive an IPC message * * @note The memory used for receiving the message (pointed to by msg) and the * IPC descriptor (pointed to by desc) must be valid until after the receive is * complete. In addition, each IPC message should use its own IPC descriptor. * Reusing an IPC descriptor will lead to unpredictable behaviours. * * @param[inout] desc an IPC descriptor for the message * @param[out] msg the memory to copy the message to * * @return 0 on success, non-zero error code otherwise */ UVISOR_EXTERN int ipc_recv(uvisor_ipc_desc_t * desc, void * msg); #endif /* __UVISOR_API_IPC_H__ */