mirror of https://github.com/ARMmbed/mbed-os.git
79 lines
2.0 KiB
C++
79 lines
2.0 KiB
C++
/* mbed Microcontroller Library
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* Copyright (c) 2018-2018 ARM Limited
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* SPDX-License-Identifier: Apache-2.0
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef __CTHUNK_BASE_H__
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#define __CTHUNK_BASE_H__
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/* IRQ/Exception compatible thunk entry function */
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typedef void (*CThunkEntry)(void);
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class CThunkBase {
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protected:
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typedef void (*Trampoline)(CThunkBase *);
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Trampoline _trampoline;
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/*
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* Allocate a CThunkEntry which can be called without arguments
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*
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* Calling the CThunkEntry invokes the _trampoline of the
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* given cthunk. This function traps if there are no more
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* free thunks.
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*/
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static CThunkEntry cthunk_alloc(CThunkBase *cthunk);
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/*
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* Free a cthunk_entry so it can be reused
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*/
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static void cthunk_free(CThunkEntry cthunk_entry);
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private:
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typedef void (*CthunkFree)(CThunkEntry cthunk_entry);
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/*
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* Table of thunk functions
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*/
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static const CThunkEntry _thunk_table[MBED_CONF_PLATFORM_CTHUNK_COUNT_MAX];
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/*
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* Table of active CThunk classes
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*/
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static CThunkBase *_thunk_storage[MBED_CONF_PLATFORM_CTHUNK_COUNT_MAX];
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/*
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* Lazily initialized free function pointer
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*/
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static CthunkFree _cthunk_free_real;
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/*
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* Actual free function
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*/
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static void cthunk_free_real(CThunkEntry cthunk_entry);
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/*
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* Template function which stored in the _thunk_table
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*/
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template<int N>
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static void thunk_entry()
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{
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_thunk_storage[N]->_trampoline(_thunk_storage[N]);
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}
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};
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#endif/*__CTHUNK_BASE_H__*/
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