1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
|
/*
ChibiOS/RT - Copyright (C) 2006,2007,2008,2009,2010,
2011 Giovanni Di Sirio.
This file is part of ChibiOS/RT.
ChibiOS/RT is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
ChibiOS/RT is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/**
* @file cosmic/STM8/chcore.h
* @brief STM8 (Cosmic) architecture port macros and structures.
*
* @addtogroup STM8_COSMIC_CORE
* @{
*/
#ifndef _CHCORE_H_
#define _CHCORE_H_
/*===========================================================================*/
/* Port configurable parameters. */
/*===========================================================================*/
/**
* @brief Enables the use of the WFI instruction in the idle thread loop.
*/
#ifndef STM8_ENABLE_WFI_IDLE
#define STM8_ENABLE_WFI_IDLE FALSE
#endif
/*===========================================================================*/
/* Port exported info. */
/*===========================================================================*/
/**
* @brief Unique macro for the implemented architecture.
*/
#define CH_ARCHITECTURE_STM8
/**
* @brief Name of the implemented architecture.
*/
#define CH_ARCHITECTURE_NAME "STM8"
/**
* @brief Name of the compiler supported by this port.
*/
#define CH_COMPILER_NAME "Cosmic"
/**
* @brief Port-specific information string.
*/
#define CH_PORT_INFO "None"
/*===========================================================================*/
/* Port implementation part. */
/*===========================================================================*/
/**
* @brief Base type for stack alignment.
* @note No alignment constraints so uint8_t.
*/
typedef uint8_t stkalign_t;
/**
* @brief Generic STM8 function pointer.
* @note It is used to allocate the proper size for return addresses in
* context-related structures.
*/
typedef void (*stm8func_t)(void);
/**
* @brief Interrupt saved context.
* @details This structure represents the stack frame saved during a
* preemption-capable interrupt handler.
* @note The structure requires one dummy field at its start because the
* stack is handled as preincremented/postdecremented.
*/
struct extctx {
uint8_t _next;
uint8_t c_y[3];
uint8_t c_x[3];
uint8_t cc;
uint8_t a;
uint16_t x;
uint16_t y;
uint8_t pce;
uint8_t pch;
uint8_t pcl;
};
/**
* @brief System saved context.
* @details This structure represents the inner stack frame during a context
* switching..
* @note The structure requires one dummy field at its start because the
* stack is handled as preincremented/postdecremented.
*/
struct intctx {
uint8_t _next;
stm8func_t pc; /* Function pointer sized return address. */
};
/**
* @brief Platform dependent part of the @p Thread structure.
* @details This structure usually contains just the saved stack pointer
* defined as a pointer to a @p intctx structure.
*/
struct context {
struct intctx *sp;
};
/**
* @brief Start context.
* @details This context is the stack organization for the trampoline code
* @p _port_thread_start().
*/
struct stm8_startctx {
uint8_t _next;
stm8func_t ts; /* Trampoline address. */
void *arg; /* Thread argument. */
stm8func_t pc; /* Thread function address. */
stm8func_t ret; /* chThdExit() address. */
};
/**
* @brief Platform dependent part of the @p chThdCreateI() API.
* @details This code usually setup the context switching frame represented
* by an @p intctx structure.
*/
#define SETUP_CONTEXT(workspace, wsize, pf, arg) { \
struct stm8_startctx *scp; \
scp = (struct stm8_startctx *)((uint8_t *)workspace + wsize - \
sizeof(struct stm8_startctx)); \
scp->ts = _port_thread_start; \
scp->arg = arg; \
scp->pc = (stm8func_t)pf; \
scp->ret = (stm8func_t)chThdExit; \
tp->p_ctx.sp = (struct intctx *)scp; \
}
/**
* @brief Stack size for the system idle thread.
* @details This size depends on the idle thread implementation, usually
* the idle thread should take no more space than those reserved
* by @p PORT_INT_REQUIRED_STACK.
*/
#ifndef PORT_IDLE_THREAD_STACK_SIZE
#define PORT_IDLE_THREAD_STACK_SIZE 0
#endif
/**
* @brief Per-thread stack overhead for interrupts servicing.
* @details This is a safe value, you may trim it down after reading the
* right size in the map file.
*/
#ifndef PORT_INT_REQUIRED_STACK
#define PORT_INT_REQUIRED_STACK 48
#endif
/**
* @brief Enforces a correct alignment for a stack area size value.
*/
#define STACK_ALIGN(n) ((((n) - 1) | (sizeof(stkalign_t) - 1)) + 1)
/**
* @brief Computes the thread working area global size.
*/
#define THD_WA_SIZE(n) STACK_ALIGN(sizeof(Thread) + \
(sizeof(struct intctx) - 1) + \
(sizeof(struct extctx) - 1) + \
(n) + (PORT_INT_REQUIRED_STACK))
/**
* @brief Static working area allocation.
* @details This macro is used to allocate a static thread working area
* aligned as both position and size.
*/
#define WORKING_AREA(s, n) stkalign_t s[THD_WA_SIZE(n) / sizeof(stkalign_t)]
/**
* @brief IRQ prologue code.
* @details This macro must be inserted at the start of all IRQ handlers
* enabled to invoke system APIs.
*/
#define PORT_IRQ_PROLOGUE()
/**
* @brief IRQ epilogue code.
* @details This macro must be inserted at the end of all IRQ handlers
* enabled to invoke system APIs.
*/
#define PORT_IRQ_EPILOGUE() { \
if (chSchIsPreemptionRequired()) \
chSchDoReschedule(); \
}
/**
* @brief IRQ handler function declaration.
* @note @p id can be a function name or a vector number depending on the
* port implementation.
*/
#define PORT_IRQ_HANDLER(id) @far @interrupt void vector##id(void)
/**
* @brief Port-related initialization code.
* @note None in this port.
*/
#define port_init()
/**
* @brief Kernel-lock action.
* @note Implemented as global interrupts disable.
*/
#define port_lock() _asm("sim")
/**
* @brief Kernel-unlock action.
* @note Implemented as global interrupts enable.
*/
#define port_unlock() _asm("rim")
/**
* @brief Kernel-lock action from an interrupt handler.
* @note This function is empty in this port.
*/
#define port_lock_from_isr()
/**
* @brief Kernel-unlock action from an interrupt handler.
* @note This function is empty in this port.
*/
#define port_unlock_from_isr()
/**
* @brief Disables all the interrupt sources.
* @note Implemented as global interrupts disable.
* @note Of course non maskable interrupt sources are not included.
*/
#define port_disable() _asm("sim")
/**
* @brief Disables the interrupt sources that are not supposed to preempt
* the kernel.
* @note Same as @p port_disable() in this port, there is no difference
* between the two states.
*/
#define port_suspend() _asm("sim")
/**
* @brief Enables all the interrupt sources.
* @note Implemented as global interrupt enable.
*/
#define port_enable() _asm("rim")
/**
* @brief Enters an architecture-dependent halt mode.
* @note Implemented with the specific "wfi" instruction.
*/
#if STM8_ENABLE_WFI_IDLE || defined(__DOXYGEN__)
#define port_wait_for_interrupt() _asm("wfi")
#else
#define port_wait_for_interrupt()
#endif
/**
* @brief Performs a context switch between two threads.
* @details This is the most critical code in any port, this function
* is responsible for the context switch between 2 threads.
* @note Implemented as a call to a low level assembler routine.
*
* @param ntp the thread to be switched in
* @param otp the thread to be switched out
*/
#define port_switch(ntp, otp) _port_switch(otp)
#ifdef __cplusplus
extern "C" {
#endif
void _port_switch(Thread *otp);
void _port_thread_start(void);
void port_halt(void);
#ifdef __cplusplus
}
#endif
/*===========================================================================*/
/* Scheduler captured code. */
/*===========================================================================*/
#define PORT_OPTIMIZED_RLIST_VAR
#define PORT_OPTIMIZED_RLIST_EXT
#define PORT_OPTIMIZED_READYLIST_STRUCT
typedef struct {
ThreadsQueue r_queue;
tprio_t r_prio;
Thread *r_current;
#if CH_USE_REGISTRY
Thread *r_newer;
Thread *r_older;
#endif
/* End of the fields shared with the Thread structure.*/
#if CH_TIME_QUANTUM > 0
cnt_t r_preempt;
#endif
} ReadyList;
@tiny extern ReadyList rlist;
#endif /* _CHCORE_H_ */
/** @} */
|