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Show/hide line numbers CThunkBase.h Source File

CThunkBase.h

00001 /* mbed Microcontroller Library
00002  * Copyright (c) 2018-2018 ARM Limited
00003  * SPDX-License-Identifier: Apache-2.0
00004  *
00005  * Licensed under the Apache License, Version 2.0 (the "License");
00006  * you may not use this file except in compliance with the License.
00007  * You may obtain a copy of the License at
00008  *
00009  *     http://www.apache.org/licenses/LICENSE-2.0
00010  *
00011  * Unless required by applicable law or agreed to in writing, software
00012  * distributed under the License is distributed on an "AS IS" BASIS,
00013  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
00014  * See the License for the specific language governing permissions and
00015  * limitations under the License.
00016  */
00017 
00018 #ifndef __CTHUNK_BASE_H__
00019 #define __CTHUNK_BASE_H__
00020 
00021 /* IRQ/Exception compatible thunk entry function */
00022 typedef void (*CThunkEntry)(void);
00023 
00024 class CThunkBase {
00025 protected:
00026     typedef void (*Trampoline)(CThunkBase *);
00027 
00028     Trampoline _trampoline;
00029 
00030     /*
00031      * Allocate a CThunkEntry which can be called without arguments
00032      *
00033      * Calling the CThunkEntry invokes the _trampoline of the
00034      * given cthunk. This function traps if there are no more
00035      * free thunks.
00036      */
00037     static CThunkEntry cthunk_alloc(CThunkBase *cthunk);
00038 
00039     /*
00040      * Free a cthunk_entry so it can be reused
00041      */
00042     static void cthunk_free(CThunkEntry cthunk_entry);
00043 
00044 private:
00045     typedef void (*CthunkFree)(CThunkEntry cthunk_entry);
00046 
00047     /*
00048      * Table of thunk functions
00049      */
00050     static const CThunkEntry _thunk_table[MBED_CONF_PLATFORM_CTHUNK_COUNT_MAX];
00051 
00052     /*
00053      * Table of active CThunk classes
00054      */
00055     static CThunkBase *_thunk_storage[MBED_CONF_PLATFORM_CTHUNK_COUNT_MAX];
00056 
00057     /*
00058      * Lazily initialized free function pointer
00059      */
00060     static CthunkFree _cthunk_free_real;
00061 
00062     /*
00063      * Actual free function
00064      */
00065     static void cthunk_free_real(CThunkEntry cthunk_entry);
00066 
00067     /*
00068      * Template function which stored in the _thunk_table
00069      */
00070     template<int N>
00071     static void thunk_entry()
00072     {
00073         _thunk_storage[N]->_trampoline(_thunk_storage[N]);
00074     }
00075 };
00076 
00077 #endif/*__CTHUNK_BASE_H__*/
00078