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start.S @ 511dc4b

Last change on this file since 511dc4b was 511dc4b, checked in by Sebastian Huber <sebastian.huber@…>, on 06/19/18 at 07:09:51

Rework initialization and interrupt stack support

Statically initialize the interrupt stack area
(_Configuration_Interrupt_stack_area_begin,
_Configuration_Interrupt_stack_area_end, and
_Configuration_Interrupt_stack_size) via <rtems/confdefs.h>. Place the
interrupt stack area in a special section ".rtemsstack.interrupt". Let
BSPs define the optimal placement of this section in their linker
command files (e.g. in a fast on-chip memory).

This change makes makes the CPU_HAS_SOFTWARE_INTERRUPT_STACK and
CPU_HAS_HARDWARE_INTERRUPT_STACK CPU port defines superfluous, since the
low level initialization code has all information available via global
symbols.

This change makes the CPU_ALLOCATE_INTERRUPT_STACK CPU port define
superfluous, since the interrupt stacks are allocated by confdefs.h for
all architectures. There is no need for BSP-specific linker command
file magic (except the section placement), see previous ARM linker
command file as a bad example.

Remove _CPU_Install_interrupt_stack(). Initialize the hardware
interrupt stack in _CPU_Initialize() if necessary (e.g.
m68k_install_interrupt_stack()).

The optional _CPU_Interrupt_stack_setup() is still useful to customize
the registration of the interrupt stack area in the per-CPU information.

The initialization stack can reuse the interrupt stack, since

interrupts are disabled during the sequential system initialization, and

the boot_card() function does not return.

This stack resuse saves memory.

Changes per architecture:

arm:

Mostly replace the linker symbol based configuration of stacks with the standard <rtems/confdefs.h> configuration via CONFIGURE_INTERRUPT_STACK_SIZE. The size of the FIQ, ABT and UND mode stack is still defined via linker symbols. These modes are rarely used in applications and the default values provided by the BSP should be sufficient in most cases.

Remove the bsp_processor_count linker symbol hack used for the SMP support. This is possible since the interrupt stack area is now allocated by the linker and not allocated from the heap. This makes some configure.ac stuff obsolete. Remove the now superfluous BSP variants altcycv_devkit_smp and realview_pbx_a9_qemu_smp.

bfin:

Remove unused magic linker command file allocation of initialization stack. Maybe a previous linker command file copy and paste problem? In the start.S the initialization stack is set to a hard coded value.

lm32, m32c, mips, nios2, riscv, sh, v850:

Remove magic linker command file allocation of initialization stack. Reuse interrupt stack for initialization stack.

m68k:

Remove magic linker command file allocation of initialization stack. Reuse interrupt stack for initialization stack.

powerpc:

Remove magic linker command file allocation of initialization stack. Reuse interrupt stack for initialization stack.

Used dedicated memory region (REGION_RTEMSSTACK) for the interrupt stack on BSPs using the shared linkcmds.base (replacement for REGION_RWEXTRA).

sparc:

Remove the hard coded initialization stack. Use the interrupt stack for the initialization stack on the boot processor. This saves 16KiB of RAM.

Update #3459.

Property mode set to 100644

File size: 18.5 KB

Line
1	/===============================================================\
2	\| Project: RTEMS generic mcf548x BSP \|
3	+-----------------------------------------------------------------+
4	\| File: start.S \|
5	+-----------------------------------------------------------------+
6	\| The file contains the assembly part of MCF548x init code \|
7	+-----------------------------------------------------------------+
8	\| Copyright (c) 2007 \|
9	\| Embedded Brains GmbH \|
10	\| Obere Lagerstr. 30 \|
11	\| D-82178 Puchheim \|
12	\| Germany \|
13	\| rtems@embedded-brains.de \|
14	+-----------------------------------------------------------------+
15	\| \|
16	\| Parts of the code has been derived from the "dBUG source code" \|
17	\| package Freescale is providing for M548X EVBs. The usage of \|
18	\| the modified or unmodified code and it's integration into the \|
19	\| generic mcf548x BSP has been done according to the Freescale \|
20	\| license terms. \|
21	\| \|
22	\| The Freescale license terms can be reviewed in the file \|
23	\| \|
24	\| Freescale_license.txt \|
25	\| \|
26	+-----------------------------------------------------------------+
27	\| \|
28	\| The generic mcf548x BSP has been developed on the basic \|
29	\| structures and modules of the av5282 BSP. \|
30	\| \|
31	+-----------------------------------------------------------------+
32	\| \|
33	\| The license and distribution terms for this file may be \|
34	\| found in the file LICENSE in this distribution or at \|
35	\| \|
36	\| http://www.rtems.org/license/LICENSE. \|
37	\| \|
38	+-----------------------------------------------------------------+
39	\| \|
40	\| date history ID \|
41	\| ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ \|
42	\| 12.11.07 1.0 ras \|
43	\| \|
44	\===============================================================/
45
46	/===============================================================\
47	\| Includes \|
48	\===============================================================/
49	#include <rtems/asm.h>
50	#include <bsp/linker-symbols.h>
51
52	/===============================================================\
53	\| External references \|
54	\===============================================================/
55	.extern __MBAR
56	.extern _CoreSramBase0
57	.extern _CoreSramBase1
58	.extern _CoreSramSize1
59	.extern mcf548x_init
60	.extern boot_card
61
62	/===============================================================\
63	\| Global symbols \|
64	\===============================================================/
65
66	.global interrupt_vector_table
67	.global spurious_int_count
68	.global start
69
70
71	/===============================================================\
72	\| Exception Table \|
73	\===============================================================/
74
75	.section ".vectors","ax" /* begin of vectors section */
76	PUBLIC (InterruptVectorTable)
77	SYM(InterruptVectorTable):
78	INITSP: .long _Configuration_Interrupt_stack_area_end /* Initial SP */
79	INITPC: .long start /* Initial PC */
80	vector002: .long asm_default_interrupt /* Access Error */
81	vector003: .long asm_default_interrupt /* Address Error */
82	vector004: .long asm_default_interrupt /* Illegal Instruction */
83	vector005: .long asm_default_interrupt /* Reserved */
84	vector006: .long asm_default_interrupt /* Reserved */
85	vector007: .long asm_default_interrupt /* Reserved */
86	vector008: .long asm_default_interrupt /* Privilege Violation */
87	vector009: .long asm_default_interrupt /* Trace */
88	vector010: .long asm_default_interrupt /* Unimplemented A-Line */
89	vector011: .long asm_default_interrupt /* Unimplemented F-Line */
90	vector012: .long asm_default_interrupt /* Debug Interrupt */
91	vector013: .long asm_default_interrupt /* Reserved */
92	vector014: .long asm_default_interrupt /* Format Error */
93	vector015: .long asm_default_interrupt /* Unitialized Int. */
94	vector016: .long asm_default_interrupt /* Reserved */
95	vector017: .long asm_default_interrupt /* Reserved */
96	vector018: .long asm_default_interrupt /* Reserved */
97	vector019: .long asm_default_interrupt /* Reserved */
98	vector020: .long asm_default_interrupt /* Reserved */
99	vector021: .long asm_default_interrupt /* Reserved */
100	vector022: .long asm_default_interrupt /* Reserved */
101	vector023: .long asm_default_interrupt /* Reserved */
102	vector024: .long asm_spurious_interrupt /* Spurious Interrupt */
103	vector025: .long asm_default_interrupt /* Autovector Level 1 */
104	vector026: .long asm_default_interrupt /* Autovector Level 2 */
105	vector027: .long asm_default_interrupt /* Autovector Level 3 */
106	vector028: .long asm_default_interrupt /* Autovector Level 4 */
107	vector029: .long asm_default_interrupt /* Autovector Level 5 */
108	vector030: .long asm_default_interrupt /* Autovector Level 6 */
109	vector031: .long asm_default_interrupt /* Autovector Level 7 */
110	vector032: .long asm_default_interrupt /* TRAP #0 */
111	vector033: .long asm_default_interrupt /* TRAP #1 */
112	vector034: .long asm_default_interrupt /* TRAP #2 */
113	vector035: .long asm_default_interrupt /* TRAP #3 */
114	vector036: .long asm_default_interrupt /* TRAP #4 */
115	vector037: .long asm_default_interrupt /* TRAP #5 */
116	vector038: .long asm_default_interrupt /* TRAP #6 */
117	vector039: .long asm_default_interrupt /* TRAP #7 */
118	vector040: .long asm_default_interrupt /* TRAP #8 */
119	vector041: .long asm_default_interrupt /* TRAP #9 */
120	vector042: .long asm_default_interrupt /* TRAP #10 */
121	vector043: .long asm_default_interrupt /* TRAP #11 */
122	vector044: .long asm_default_interrupt /* TRAP #12 */
123	vector045: .long asm_default_interrupt /* TRAP #13 */
124	vector046: .long asm_default_interrupt /* TRAP #14 */
125	vector047: .long asm_default_interrupt /* TRAP #15 */
126	vector048: .long asm_default_interrupt /* Reserved */
127	vector049: .long asm_default_interrupt /* Reserved */
128	vector050: .long asm_default_interrupt /* Reserved */
129	vector051: .long asm_default_interrupt /* Reserved */
130	vector052: .long asm_default_interrupt /* Reserved */
131	vector053: .long asm_default_interrupt /* Reserved */
132	vector054: .long asm_default_interrupt /* Reserved */
133	vector055: .long asm_default_interrupt /* Reserved */
134	vector056: .long asm_default_interrupt /* Reserved */
135	vector057: .long asm_default_interrupt /* Reserved */
136	vector058: .long asm_default_interrupt /* Reserved */
137	vector059: .long asm_default_interrupt /* Reserved */
138	vector060: .long asm_default_interrupt /* Reserved */
139	vector061: .long asm_default_interrupt /* Reserved */
140	vector062: .long asm_default_interrupt /* Reserved */
141	vector063: .long asm_default_interrupt /* Reserved */
142	vector064: .long asm_default_interrupt
143	vector065: .long asm_default_interrupt
144	vector066: .long asm_default_interrupt
145	vector067: .long asm_default_interrupt
146	vector068: .long asm_default_interrupt
147	vector069: .long asm_default_interrupt
148	vector070: .long asm_default_interrupt
149	vector071: .long asm_default_interrupt
150	vector072: .long asm_default_interrupt
151	vector073: .long asm_default_interrupt
152	vector074: .long asm_default_interrupt
153	vector075: .long asm_default_interrupt
154	vector076: .long asm_default_interrupt
155	vector077: .long asm_default_interrupt
156	vector078: .long asm_default_interrupt
157	vector079: .long asm_default_interrupt
158	vector080: .long asm_default_interrupt
159	vector081: .long asm_default_interrupt
160	vector082: .long asm_default_interrupt
161	vector083: .long asm_default_interrupt
162	vector084: .long asm_default_interrupt
163	vector085: .long asm_default_interrupt
164	vector086: .long asm_default_interrupt
165	vector087: .long asm_default_interrupt
166	vector088: .long asm_default_interrupt
167	vector089: .long asm_default_interrupt
168	vector090: .long asm_default_interrupt
169	vector091: .long asm_default_interrupt
170	vector092: .long asm_default_interrupt
171	vector093: .long asm_default_interrupt
172	vector094: .long asm_default_interrupt
173	vector095: .long asm_default_interrupt
174	vector096: .long asm_default_interrupt
175	vector097: .long asm_default_interrupt
176	vector098: .long asm_default_interrupt
177	vector099: .long asm_default_interrupt
178	vector100: .long asm_default_interrupt
179	vector101: .long asm_default_interrupt
180	vector102: .long asm_default_interrupt
181	vector103: .long asm_default_interrupt
182	vector104: .long asm_default_interrupt
183	vector105: .long asm_default_interrupt
184	vector106: .long asm_default_interrupt
185	vector107: .long asm_default_interrupt
186	vector108: .long asm_default_interrupt
187	vector109: .long asm_default_interrupt
188	vector110: .long asm_default_interrupt
189	vector111: .long asm_default_interrupt
190	vector112: .long asm_default_interrupt
191	vector113: .long asm_default_interrupt
192	vector114: .long asm_default_interrupt
193	vector115: .long asm_default_interrupt
194	vector116: .long asm_default_interrupt
195	vector117: .long asm_default_interrupt
196	vector118: .long asm_default_interrupt
197	vector119: .long asm_default_interrupt
198	vector120: .long asm_default_interrupt
199	vector121: .long asm_default_interrupt
200	vector122: .long asm_default_interrupt
201	vector123: .long asm_default_interrupt
202	vector124: .long asm_default_interrupt
203	vector125: .long asm_default_interrupt
204	vector126: .long asm_default_interrupt
205	vector127: .long asm_default_interrupt
206	vector128: .long asm_default_interrupt
207	vector129: .long asm_default_interrupt
208	vector130: .long asm_default_interrupt
209	vector131: .long asm_default_interrupt
210	vector132: .long asm_default_interrupt
211	vector133: .long asm_default_interrupt
212	vector134: .long asm_default_interrupt
213	vector135: .long asm_default_interrupt
214	vector136: .long asm_default_interrupt
215	vector137: .long asm_default_interrupt
216	vector138: .long asm_default_interrupt
217	vector139: .long asm_default_interrupt
218	vector140: .long asm_default_interrupt
219	vector141: .long asm_default_interrupt
220	vector142: .long asm_default_interrupt
221	vector143: .long asm_default_interrupt
222	vector144: .long asm_default_interrupt
223	vector145: .long asm_default_interrupt
224	vector146: .long asm_default_interrupt
225	vector147: .long asm_default_interrupt
226	vector148: .long asm_default_interrupt
227	vector149: .long asm_default_interrupt
228	vector150: .long asm_default_interrupt
229	vector151: .long asm_default_interrupt
230	vector152: .long asm_default_interrupt
231	vector153: .long asm_default_interrupt
232	vector154: .long asm_default_interrupt
233	vector155: .long asm_default_interrupt
234	vector156: .long asm_default_interrupt
235	vector157: .long asm_default_interrupt
236	vector158: .long asm_default_interrupt
237	vector159: .long asm_default_interrupt
238	vector160: .long asm_default_interrupt
239	vector161: .long asm_default_interrupt
240	vector162: .long asm_default_interrupt
241	vector163: .long asm_default_interrupt
242	vector164: .long asm_default_interrupt
243	vector165: .long asm_default_interrupt
244	vector166: .long asm_default_interrupt
245	vector167: .long asm_default_interrupt
246	vector168: .long asm_default_interrupt
247	vector169: .long asm_default_interrupt
248	vector170: .long asm_default_interrupt
249	vector171: .long asm_default_interrupt
250	vector172: .long asm_default_interrupt
251	vector173: .long asm_default_interrupt
252	vector174: .long asm_default_interrupt
253	vector175: .long asm_default_interrupt
254	vector176: .long asm_default_interrupt
255	vector177: .long asm_default_interrupt
256	vector178: .long asm_default_interrupt
257	vector179: .long asm_default_interrupt
258	vector180: .long asm_default_interrupt
259	vector181: .long asm_default_interrupt
260	vector182: .long asm_default_interrupt
261	vector183: .long asm_default_interrupt
262	vector184: .long asm_default_interrupt
263	vector185: .long asm_default_interrupt
264	vector186: .long asm_default_interrupt
265	vector187: .long asm_default_interrupt
266	vector188: .long asm_default_interrupt
267	vector189: .long asm_default_interrupt
268	vector190: .long asm_default_interrupt
269	vector191: .long asm_default_interrupt
270	vector192: .long asm_default_interrupt
271	vector193: .long asm_default_interrupt
272	vector194: .long asm_default_interrupt
273	vector195: .long asm_default_interrupt
274	vector196: .long asm_default_interrupt
275	vector197: .long asm_default_interrupt
276	vector198: .long asm_default_interrupt
277	vector199: .long asm_default_interrupt
278	vector200: .long asm_default_interrupt
279	vector201: .long asm_default_interrupt
280	vector202: .long asm_default_interrupt
281	vector203: .long asm_default_interrupt
282	vector204: .long asm_default_interrupt
283	vector205: .long asm_default_interrupt
284	vector206: .long asm_default_interrupt
285	vector207: .long asm_default_interrupt
286	vector208: .long asm_default_interrupt
287	vector209: .long asm_default_interrupt
288	vector210: .long asm_default_interrupt
289	vector211: .long asm_default_interrupt
290	vector212: .long asm_default_interrupt
291	vector213: .long asm_default_interrupt
292	vector214: .long asm_default_interrupt
293	vector215: .long asm_default_interrupt
294	vector216: .long asm_default_interrupt
295	vector217: .long asm_default_interrupt
296	vector218: .long asm_default_interrupt
297	vector219: .long asm_default_interrupt
298	vector220: .long asm_default_interrupt
299	vector221: .long asm_default_interrupt
300	vector222: .long asm_default_interrupt
301	vector223: .long asm_default_interrupt
302	vector224: .long asm_default_interrupt
303	vector225: .long asm_default_interrupt
304	vector226: .long asm_default_interrupt
305	vector227: .long asm_default_interrupt
306	vector228: .long asm_default_interrupt
307	vector229: .long asm_default_interrupt
308	vector230: .long asm_default_interrupt
309	vector231: .long asm_default_interrupt
310	vector232: .long asm_default_interrupt
311	vector233: .long asm_default_interrupt
312	vector234: .long asm_default_interrupt
313	vector235: .long asm_default_interrupt
314	vector236: .long asm_default_interrupt
315	vector237: .long asm_default_interrupt
316	vector238: .long asm_default_interrupt
317	vector239: .long asm_default_interrupt
318	vector240: .long asm_default_interrupt
319	vector241: .long asm_default_interrupt
320	vector242: .long asm_default_interrupt
321	vector243: .long asm_default_interrupt
322	vector244: .long asm_default_interrupt
323	vector245: .long asm_default_interrupt
324	vector246: .long asm_default_interrupt
325	vector247: .long asm_default_interrupt
326	vector248: .long asm_default_interrupt
327	vector249: .long asm_default_interrupt
328	vector250: .long asm_default_interrupt
329	vector251: .long asm_default_interrupt
330	vector252: .long asm_default_interrupt
331	vector253: .long asm_default_interrupt
332	vector254: .long asm_default_interrupt
333	vector255: .long asm_default_interrupt
334
335	/===============================================================\
336	\| Start of code \|
337	\===============================================================/
338	.text
339	PUBLIC (start)
340	SYM(start):
341	move.w #0x3700,sr /* disable interrupts */
342	jmp start_init
343
344	/===============================================================\
345	\| Sspurious interrupt counter \|
346	\===============================================================/
347	.align 4
348	.data /* begin of data section */
349	PUBLIC (spurious_int_count)
350	SYM(spurious_int_count):
351	.long 0 /* spurious interrupt counter */
352
353	/===============================================================\
354	\| Function: Default exception handler \|
355	+-----------------------------------------------------------------+
356	\| - stop and disable all interrupts \|
357	\| - loop forever \|
358	\===============================================================/
359	.text /* start of text section */
360	.align 4
361	PUBLIC (asm_default_interrupt)
362	SYM(asm_default_interrupt):
363	nop
364	stop #0x3700 /* stop */
365	bra.w asm_default_interrupt /* loop forever */
366
367	/===============================================================\
368	\| Function: Exception handler for spurious interrupts \|
369	+-----------------------------------------------------------------+
370	\| - count spurious interrupts \|
371	\===============================================================/
372	.align 4
373	PUBLIC (asm_spurious_interrupt)
374	SYM(asm_spurious_interrupt):
375	add.l #1,spurious_int_count
376	rte
377
378	/===============================================================\
379	\| Function: start_init \|
380	+-----------------------------------------------------------------+
381	\| - Disable all intterupts \|
382	\| - Setup the internal SRAM \|
383	\| - Initialize mcf548x peripherals \|
384	\| - Set initial stack pointer \|
385	\| - Boot RTEMS
386	\===============================================================/
387	.align 4
388	PUBLIC (start_init)
389	SYM(start_init):
390
391	move.l #0x01040100,d0 /* invalidate instruction/data/branch cache, disable all caches */
392	movec d0,cacr
393
394	move.l #_CoreSramBase0,d0 /* initialize RAMBAR0 */
395	add.l #0x21,d0 /* for code & data */
396	movec d0,rambar0
397
398	move.l #_CoreSramBase1,d0 /* initialize RAMBAR1 */
399	add.l #0x21,d0 /* for code & data */
400	movec d0,rambar1 /* movec d0,RAMBAR1 */
401
402	move.l #__MBAR,d0 /* initialize MBAR */
403	movec d0,mbar
404
405	move.l #_CoreSramBase1,d0 /* set sp to end of Core SRAM temporarily */
406	add.l #_CoreSramSize1,d0
407	move.l d0,sp
408
409	move.l #0,d0 /* initialize frame pointer */
410	movea.l d0,a6
411
412	jsr mcf548x_init /* Initialize mcf548x peripherals */
413
414	move.l #_Configuration_Interrupt_stack_area_end,sp /* relocate sp */
415
416	clrl d0 /* clear d0 */
417	movel d0,a7@- /* command line == 0 */
418
419	jsr boot_card /* boot rtems */
420
421	movel a7@+,d0
422
423	exit_multitasking:
424	nop
425	nop
426	halt
427	bra exit_multitasking
428
429	.end /* end of start.S module */
430
431
432

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