portmacro.h

Revision 65, 9.4 kB (checked in by phil, 14 years ago)
fixed compilation issue in portmacro.h for new CrossWorks? assembler/compiler

Line
1	/*
2	FreeRTOS V5.4.1 - Copyright (C) 2009 Real Time Engineers Ltd.
3
4	This file is part of the FreeRTOS distribution.
5
6	FreeRTOS is free software; you can redistribute it and/or modify it under
7	the terms of the GNU General Public License (version 2) as published by the
8	Free Software Foundation and modified by the FreeRTOS exception.
9	NOTE The exception to the GPL is included to allow you to distribute a
10	combined work that includes FreeRTOS without being obliged to provide the
11	source code for proprietary components outside of the FreeRTOS kernel.
12	Alternative commercial license and support terms are also available upon
13	request. See the licensing section of http://www.FreeRTOS.org for full
14	license details.
15
16	FreeRTOS is distributed in the hope that it will be useful, but WITHOUT
17	ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
18	FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
19	more details.
20
21	You should have received a copy of the GNU General Public License along
22	with FreeRTOS; if not, write to the Free Software Foundation, Inc., 59
23	Temple Place, Suite 330, Boston, MA 02111-1307 USA.
24
25
26	***************************************************************************
27	* *
28	* Looking for a quick start? Then check out the FreeRTOS eBook! *
29	* See http://www.FreeRTOS.org/Documentation for details *
30	* *
31	***************************************************************************
32
33	1 tab == 4 spaces!
34
35	Please ensure to read the configuration and relevant port sections of the
36	online documentation.
37
38	http://www.FreeRTOS.org - Documentation, latest information, license and
39	contact details.
40
41	http://www.SafeRTOS.com - A version that is certified for use in safety
42	critical systems.
43
44	http://www.OpenRTOS.com - Commercial support, development, porting,
45	licensing and training services.
46	*/
47
48	/*
49	Changes from V3.2.3
50
51	+ Modified portENTER_SWITCHING_ISR() to allow use with GCC V4.0.1.
52
53	Changes from V3.2.4
54
55	+ Removed the use of the %0 parameter within the assembler macros and
56	replaced them with hard coded registers. This will ensure the
57	assembler does not select the link register as the temp register as
58	was occasionally happening previously.
59
60	+ The assembler statements are now included in a single asm block rather
61	than each line having its own asm block.
62
63	Changes from V4.5.0
64
65	+ Removed the portENTER_SWITCHING_ISR() and portEXIT_SWITCHING_ISR() macros
66	and replaced them with portYIELD_FROM_ISR() macro. Application code
67	should now make use of the portSAVE_CONTEXT() and portRESTORE_CONTEXT()
68	macros as per the V4.5.1 demo code.
69	*/
70
71	#ifndef PORTMACRO_H
72	#define PORTMACRO_H
73
74	#ifdef __cplusplus
75	extern "C" {
76	#endif
77
78	/*-----------------------------------------------------------
79	* Port specific definitions.
80	*
81	* The settings in this file configure FreeRTOS correctly for the
82	* given hardware and compiler.
83	*
84	* These settings should not be altered.
85	*-----------------------------------------------------------
86	*/
87
88	/* Type definitions. */
89	#define portCHAR char
90	#define portFLOAT float
91	#define portDOUBLE double
92	#define portLONG long
93	#define portSHORT short
94	#define portSTACK_TYPE unsigned portLONG
95	#define portBASE_TYPE portLONG
96
97	#if( configUSE_16_BIT_TICKS == 1 )
98	typedef unsigned portSHORT portTickType;
99	#define portMAX_DELAY ( portTickType ) 0xffff
100	#else
101	typedef unsigned portLONG portTickType;
102	#define portMAX_DELAY ( portTickType ) 0xffffffff
103	#endif
104	/-----------------------------------------------------------/
105
106	/* Architecture specifics. */
107	#define portSTACK_GROWTH ( -1 )
108	#define portTICK_RATE_MS ( ( portTickType ) 1000 / configTICK_RATE_HZ )
109	#define portBYTE_ALIGNMENT 4
110	#define portNOP() asm volatile ( "NOP" );
111	/-----------------------------------------------------------/
112
113
114	/* Scheduler utilities. */
115
116	/*
117	* portRESTORE_CONTEXT, portRESTORE_CONTEXT, portENTER_SWITCHING_ISR
118	* and portEXIT_SWITCHING_ISR can only be called from ARM mode, but
119	* are included here for efficiency. An attempt to call one from
120	* THUMB mode code will result in a compile time error.
121	*/
122
123	#define portRESTORE_CONTEXT() \
124	{ \
125	extern volatile void * volatile pxCurrentTCB; \
126	extern volatile unsigned portLONG ulCriticalNesting; \
127	\
128	/* Set the LR to the task stack. */ \
129	asm volatile ( \
130	"LDR R0, =pxCurrentTCB \n\t" \
131	"LDR R0, [R0] \n\t" \
132	"LDR LR, [R0] \n\t" \
133	\
134	/* The critical nesting depth is the first item on the stack. */ \
135	/* Load it into the ulCriticalNesting variable. */ \
136	"LDR R0, =ulCriticalNesting \n\t" \
137	"LDMFD LR!, {R1} \n\t" \
138	"STR R1, [R0] \n\t" \
139	\
140	/* Get the SPSR from the stack. */ \
141	"LDMFD LR!, {R0} \n\t" \
142	"MSR SPSR, R0 \n\t" \
143	\
144	/* Restore all system mode registers for the task. */ \
145	"LDMFD LR, {R0-R14}^ \n\t" \
146	"NOP \n\t" \
147	\
148	/* Restore the return address. */ \
149	"LDR LR, [LR, #+60] \n\t" \
150	\
151	/* And return - correcting the offset in the LR to obtain the */ \
152	/* correct address. */ \
153	"SUBS PC, LR, #4 \n\t" \
154	); \
155	( void ) ulCriticalNesting; \
156	( void ) pxCurrentTCB; \
157	}
158	/-----------------------------------------------------------/
159
160	#define portSAVE_CONTEXT() \
161	{ \
162	extern volatile void * volatile pxCurrentTCB; \
163	extern volatile unsigned portLONG ulCriticalNesting; \
164	\
165	/* Push R0 as we are going to use the register. */ \
166	asm volatile ( \
167	"STMDB SP!, {R0} \n\t" \
168	\
169	/* Set R0 to point to the task stack pointer. */ \
170	"STMDB SP,{SP}^ \n\t" \
171	"NOP \n\t" \
172	"SUB SP, SP, #4 \n\t" \
173	"LDMIA SP!,{R0} \n\t" \
174	\
175	/* Push the return address onto the stack. */ \
176	"STMDB R0!, {LR} \n\t" \
177	\
178	/* Now we have saved LR we can use it instead of R0. */ \
179	"MOV LR, R0 \n\t" \
180	\
181	/* Pop R0 so we can save it onto the system mode stack. */ \
182	"LDMIA SP!, {R0} \n\t" \
183	\
184	/* Push all the system mode registers onto the task stack. */ \
185	"STMDB LR,{R0-LR}^ \n\t" \
186	"NOP \n\t" \
187	"SUB LR, LR, #60 \n\t" \
188	\
189	/* Push the SPSR onto the task stack. */ \
190	"MRS R0, SPSR \n\t" \
191	"STMDB LR!, {R0} \n\t" \
192	\
193	"LDR R0, =ulCriticalNesting \n\t" \
194	"LDR R0, [R0] \n\t" \
195	"STMDB LR!, {R0} \n\t" \
196	\
197	/* Store the new top of stack for the task. */ \
198	"LDR R0, =pxCurrentTCB \n\t" \
199	"LDR R0, [R0] \n\t" \
200	"STR LR, [R0] \n\t" \
201	); \
202	( void ) ulCriticalNesting; \
203	( void ) pxCurrentTCB; \
204	}
205
206
207	#define portYIELD_FROM_ISR() vTaskSwitchContext()
208	#define portYIELD() asm volatile ( "SWI 0" )
209	/-----------------------------------------------------------/
210
211
212	/* Critical section management. */
213
214	/*
215	* The interrupt management utilities can only be called from ARM mode. When
216	* THUMB_INTERWORK is defined the utilities are defined as functions in
217	* portISR.c to ensure a switch to ARM mode. When THUMB_INTERWORK is not
218	* defined then the utilities are defined as macros here - as per other ports.
219	*/
220
221	#ifdef THUMB_INTERWORK
222
223	extern void vPortDisableInterruptsFromThumb( void ) __attribute__ ((naked));
224	extern void vPortEnableInterruptsFromThumb( void ) __attribute__ ((naked));
225
226	#define portDISABLE_INTERRUPTS() vPortDisableInterruptsFromThumb()
227	#define portENABLE_INTERRUPTS() vPortEnableInterruptsFromThumb()
228
229	#else
230
231	#define portDISABLE_INTERRUPTS() \
232	asm volatile ( \
233	"STMDB SP!, {R0} \n\t" /* Push R0. */ \
234	"MRS R0, CPSR \n\t" /* Get CPSR. */ \
235	"ORR R0, R0, #0xC0 \n\t" /* Disable IRQ, FIQ. */ \
236	"MSR CPSR, R0 \n\t" /* Write back modified value. */ \
237	"LDMIA SP!, {R0} " ) /* Pop R0. */
238
239	#define portENABLE_INTERRUPTS() \
240	asm volatile ( \
241	"STMDB SP!, {R0} \n\t" /* Push R0. */ \
242	"MRS R0, CPSR \n\t" /* Get CPSR. */ \
243	"BIC R0, R0, #0xC0 \n\t" /* Enable IRQ, FIQ. */ \
244	"MSR CPSR, R0 \n\t" /* Write back modified value. */ \
245	"LDMIA SP!, {R0} " ) /* Pop R0. */
246
247	#endif /* THUMB_INTERWORK */
248
249	extern void vPortEnterCritical( void );
250	extern void vPortExitCritical( void );
251
252	#define portENTER_CRITICAL() vPortEnterCritical();
253	#define portEXIT_CRITICAL() vPortExitCritical();
254	/-----------------------------------------------------------/
255
256	/* Task function macros as described on the FreeRTOS.org WEB site. */
257	#define portTASK_FUNCTION_PROTO( vFunction, pvParameters ) void vFunction( void *pvParameters )
258	#define portTASK_FUNCTION( vFunction, pvParameters ) void vFunction( void *pvParameters )
259
260	#ifdef __cplusplus
261	}
262	#endif
263
264	#endif /* PORTMACRO_H */
265

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