aboutsummaryrefslogtreecommitdiff
path: root/sim/ppc/cpu.c
blob: 3169553a58707db32fa8448f0e575c943c39712f (plain)
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
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
/*  This file is part of the program psim.

    Copyright (C) 1994-1997, Andrew Cagney <cagney@highland.com.au>

    This program 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.

    This program 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/>.
 
    */


#ifndef _CPU_C_
#define _CPU_C_

#include <setjmp.h>

#include "cpu.h"
#include "idecode.h"

#include <string.h>

struct _cpu {

  /* the registers */
  registers regs;

  /* current instruction address */
  unsigned_word program_counter;

  /* the memory maps */
  core *physical; /* all of memory */
  vm *virtual;
  vm_instruction_map *instruction_map; /* instructions */
  vm_data_map *data_map; /* data */

  /* the system this processor is contained within */
  cpu_mon *monitor;
  os_emul *os_emulation;
  psim *system;
  event_queue *events;
  int cpu_nr;

  /* Current CPU model information */
  model_data *model_ptr;

#if WITH_IDECODE_CACHE_SIZE
  /* a cache to store cracked instructions */
  idecode_cache icache[WITH_IDECODE_CACHE_SIZE];
#endif

  /* any interrupt state */
  interrupts ints;

  /* address reservation: keep the physical address and the contents
     of memory at that address */
  memory_reservation reservation;

  /* offset from event time to this cpu's idea of the local time */
  signed64 time_base_local_time;
  signed64 decrementer_local_time;
  event_entry_tag decrementer_event;

};

INLINE_CPU\
(cpu *)
cpu_create(psim *system,
	   core *memory,
	   cpu_mon *monitor,
	   os_emul *os_emulation,
	   int cpu_nr)
{
  cpu *processor = ZALLOC(cpu);

  /* create the virtual memory map from the core */
  processor->physical = memory;
  processor->virtual = vm_create(memory);
  processor->instruction_map = vm_create_instruction_map(processor->virtual);
  processor->data_map = vm_create_data_map(processor->virtual);

  if (CURRENT_MODEL_ISSUE > 0)
    processor->model_ptr = model_create (processor);

  /* link back to core system */
  processor->system = system;
  processor->events = psim_event_queue(system);
  processor->cpu_nr = cpu_nr;
  processor->monitor = monitor;
  processor->os_emulation = os_emulation;

  return processor;
}


INLINE_CPU\
(void)
cpu_init(cpu *processor)
{
  memset(&processor->regs, 0, sizeof(processor->regs));
  /* vm init is delayed until after the device tree has been init as
     the devices may further init the cpu */
  if (CURRENT_MODEL_ISSUE > 0)
    model_init (processor->model_ptr);
}


/* find ones way home */

INLINE_CPU\
(psim *)
cpu_system(cpu *processor)
{
  return processor->system;
}

INLINE_CPU\
(int)
cpu_nr(cpu *processor)
{
  return processor->cpu_nr;
}

INLINE_CPU\
(cpu_mon *)
cpu_monitor(cpu *processor)
{
  return processor->monitor;
}

INLINE_CPU\
(os_emul *)
cpu_os_emulation(cpu *processor)
{
  return processor->os_emulation;
}

INLINE_CPU\
(model_data *)
cpu_model(cpu *processor)
{
  return processor->model_ptr;
}


/* program counter manipulation */

INLINE_CPU\
(void)
cpu_set_program_counter(cpu *processor,
			unsigned_word new_program_counter)
{
  processor->program_counter = new_program_counter;
}

INLINE_CPU\
(unsigned_word)
cpu_get_program_counter(cpu *processor)
{
  return processor->program_counter;
}


INLINE_CPU\
(void)
cpu_restart(cpu *processor,
	    unsigned_word nia)
{
  ASSERT(processor != NULL);
  cpu_set_program_counter(processor, nia);
  psim_restart(processor->system, processor->cpu_nr);
}

INLINE_CPU\
(void)
cpu_halt(cpu *processor,
	 unsigned_word nia,
	 stop_reason reason,
	 int signal)
{
  ASSERT(processor != NULL);
  if (CURRENT_MODEL_ISSUE > 0)
    model_halt(processor->model_ptr);
  cpu_set_program_counter(processor, nia);
  psim_halt(processor->system, processor->cpu_nr, reason, signal);
}

EXTERN_CPU\
(void)
cpu_error(cpu *processor,
	  unsigned_word cia,
	  const char *fmt,
	  ...)
{
  char message[1024];
  va_list ap;

  /* format the message */
  va_start(ap, fmt);
  vsprintf(message, fmt, ap);
  va_end(ap);

  /* sanity check */
  if (strlen(message) >= sizeof(message))
    error("cpu_error: buffer overflow");

  if (processor != NULL) {
    printf_filtered("cpu %d, cia 0x%lx: %s\n",
		    processor->cpu_nr + 1, (unsigned long)cia, message);
    cpu_halt(processor, cia, was_signalled, -1);
  }
  else {
    error("cpu: %s", message);
  }
}


/* The processors local concept of time */

INLINE_CPU\
(signed64)
cpu_get_time_base(cpu *processor)
{
  return (event_queue_time(processor->events)
	  - processor->time_base_local_time);
}

INLINE_CPU\
(void)
cpu_set_time_base(cpu *processor,
		  signed64 time_base)
{
  processor->time_base_local_time = (event_queue_time(processor->events)
				     - time_base);
}

INLINE_CPU\
(signed32)
cpu_get_decrementer(cpu *processor)
{
  return (processor->decrementer_local_time
	  - event_queue_time(processor->events));
}

STATIC_INLINE_CPU\
(void)
cpu_decrement_event(void *data)
{
  cpu *processor = (cpu*)data;
  processor->decrementer_event = NULL;
  decrementer_interrupt(processor);
}

INLINE_CPU\
(void)
cpu_set_decrementer(cpu *processor,
		    signed32 decrementer)
{
  signed64 old_decrementer = cpu_get_decrementer(processor);
  event_queue_deschedule(processor->events, processor->decrementer_event);
  processor->decrementer_event = NULL;
  processor->decrementer_local_time = (event_queue_time(processor->events)
				       + decrementer);
  if (decrementer < 0 && old_decrementer >= 0)
    /* A decrementer interrupt occures if the sign of the decrement
       register is changed from positive to negative by the load
       instruction */
    decrementer_interrupt(processor);
  else if (decrementer >= 0)
    processor->decrementer_event = event_queue_schedule(processor->events,
							decrementer,
							cpu_decrement_event,
							processor);
}


#if WITH_IDECODE_CACHE_SIZE
/* allow access to the cpu's instruction cache */
INLINE_CPU\
(idecode_cache *)
cpu_icache_entry(cpu *processor,
		 unsigned_word cia)
{
  return &processor->icache[cia / 4 % WITH_IDECODE_CACHE_SIZE];
}


INLINE_CPU\
(void)
cpu_flush_icache(cpu *processor)
{
  int i;
  /* force all addresses to 0xff... so that they never hit */
  for (i = 0; i < WITH_IDECODE_CACHE_SIZE; i++)
    processor->icache[i].address = MASK(0, 63);
}
#endif


/* address map revelation */

INLINE_CPU\
(vm_instruction_map *)
cpu_instruction_map(cpu *processor)
{
  return processor->instruction_map;
}

INLINE_CPU\
(vm_data_map *)
cpu_data_map(cpu *processor)
{
  return processor->data_map;
}

INLINE_CPU\
(void)
cpu_page_tlb_invalidate_entry(cpu *processor,
			      unsigned_word ea)
{
  vm_page_tlb_invalidate_entry(processor->virtual, ea);
}

INLINE_CPU\
(void)
cpu_page_tlb_invalidate_all(cpu *processor)
{
  vm_page_tlb_invalidate_all(processor->virtual);
}


/* interrupt access */

INLINE_CPU\
(interrupts *)
cpu_interrupts(cpu *processor)
{
  return &processor->ints;
}



/* reservation access */

INLINE_CPU\
(memory_reservation *)
cpu_reservation(cpu *processor)
{
  return &processor->reservation;
}


/* register access */

INLINE_CPU\
(registers *)
cpu_registers(cpu *processor)
{
  return &processor->regs;
}

INLINE_CPU\
(void)
cpu_synchronize_context(cpu *processor,
			unsigned_word cia)
{
#if (WITH_IDECODE_CACHE_SIZE)
  /* kill of the cache */
  cpu_flush_icache(processor);
#endif

  /* update virtual memory */
  vm_synchronize_context(processor->virtual,
			 processor->regs.spr,
			 processor->regs.sr,
			 processor->regs.msr,
			 processor, cia);
}


/* might again be useful one day */

INLINE_CPU\
(void)
cpu_print_info(cpu *processor, int verbose)
{
}

#endif /* _CPU_C_ */