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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 /* IRQ/Exception compatible thunk entry function */
22 typedef void (*CThunkEntry)(void);
23 
24 class CThunkBase {
25 protected:
26  typedef void (*Trampoline)(CThunkBase *);
27 
28  Trampoline _trampoline;
29 
30  /*
31  * Allocate a CThunkEntry which can be called without arguments
32  *
33  * Calling the CThunkEntry invokes the _trampoline of the
34  * given cthunk. This function traps if there are no more
35  * free thunks.
36  */
37  static CThunkEntry cthunk_alloc(CThunkBase *cthunk);
38 
39  /*
40  * Free a cthunk_entry so it can be reused
41  */
42  static void cthunk_free(CThunkEntry cthunk_entry);
43 
44 private:
45  typedef void (*CthunkFree)(CThunkEntry cthunk_entry);
46 
47  /*
48  * Table of thunk functions
49  */
50  static const CThunkEntry _thunk_table[MBED_CONF_PLATFORM_CTHUNK_COUNT_MAX];
51 
52  /*
53  * Table of active CThunk classes
54  */
55  static CThunkBase *_thunk_storage[MBED_CONF_PLATFORM_CTHUNK_COUNT_MAX];
56 
57  /*
58  * Lazily initialized free function pointer
59  */
60  static CthunkFree _cthunk_free_real;
61 
62  /*
63  * Actual free function
64  */
65  static void cthunk_free_real(CThunkEntry cthunk_entry);
66 
67  /*
68  * Template function which stored in the _thunk_table
69  */
70  template<int N>
71  static void thunk_entry()
72  {
73  _thunk_storage[N]->_trampoline(_thunk_storage[N]);
74  }
75 };
76 
77 #endif/*__CTHUNK_BASE_H__*/
78 
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