Mbed OS Reference
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CThunkBase.h
1/* mbed Microcontroller Library
2 * Copyright (c) 2018-2018 ARM Limited
3 * SPDX-License-Identifier: Apache-2.0
4 *
5 * Licensed under the Apache License, Version 2.0 (the "License");
6 * you may not use this file except in compliance with the License.
7 * You may obtain a copy of the License at
8 *
9 * http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 */
17
18#ifndef __CTHUNK_BASE_H__
19#define __CTHUNK_BASE_H__
20
21/** \defgroup platform-internal-api Platform
22 * \ingroup mbed-os-internal
23 */
24
25/* IRQ/Exception compatible thunk entry function */
26typedef void (*CThunkEntry)(void);
27
28/**
29 * \defgroup platform_CThunkBase CThunkBase class
30 * \ingroup platform-internal-api
31 * @{
32 */
34protected:
35 typedef void (*Trampoline)(CThunkBase *);
36
37 Trampoline _trampoline;
38
39 /*
40 * Allocate a CThunkEntry which can be called without arguments
41 *
42 * Calling the CThunkEntry invokes the _trampoline of the
43 * given cthunk. This function traps if there are no more
44 * free thunks.
45 */
46 static CThunkEntry cthunk_alloc(CThunkBase *cthunk);
47
48 /*
49 * Free a cthunk_entry so it can be reused
50 */
51 static void cthunk_free(CThunkEntry cthunk_entry);
52
53private:
54 typedef void (*CthunkFree)(CThunkEntry cthunk_entry);
55
56 /*
57 * Table of thunk functions
58 */
59 static const CThunkEntry _thunk_table[MBED_CONF_PLATFORM_CTHUNK_COUNT_MAX];
60
61 /*
62 * Table of active CThunk classes
63 */
64 static CThunkBase *_thunk_storage[MBED_CONF_PLATFORM_CTHUNK_COUNT_MAX];
65
66 /*
67 * Lazily initialized free function pointer
68 */
69 static CthunkFree _cthunk_free_real;
70
71 /*
72 * Actual free function
73 */
74 static void cthunk_free_real(CThunkEntry cthunk_entry);
75
76 /*
77 * Template function which stored in the _thunk_table
78 */
79 template<int N>
80 static void thunk_entry()
81 {
82 _thunk_storage[N]->_trampoline(_thunk_storage[N]);
83 }
84};
85
86/**@}*/
87
88#endif/*__CTHUNK_BASE_H__*/