sim/ppc/cpu.c

   1 /*  This file is part of the program psim.
   2
   3     Copyright (C) 1994-1995, Andrew Cagney <cagney@highland.com.au>
   4
   5     This program is free software; you can redistribute it and/or modify
   6     it under the terms of the GNU General Public License as published by
   7     the Free Software Foundation; either version 2 of the License, or
   8     (at your option) any later version.
   9
  10     This program is distributed in the hope that it will be useful,
  11     but WITHOUT ANY WARRANTY; without even the implied warranty of
  12     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13     GNU General Public License for more details.
  14
  15     You should have received a copy of the GNU General Public License
  16     along with this program; if not, write to the Free Software
  17     Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  18
  19     */
  20
  21
  22 #ifndef _CPU_C_
  23 #define _CPU_C_
  24
  25 #ifndef STATIC_INLINE_CPU
  26 #define STATIC_INLINE_CPU STATIC_INLINE
  27 #endif
  28
  29 #include <setjmp.h>
  30
  31 #include "cpu.h"
  32 #include "idecode.h"
  33
  34 #ifdef HAVE_STRING_H
  35 #include <string.h>
  36 #else
  37 #ifdef HAVE_STRINGS_H
  38 #include <strings.h>
  39 #endif
  40 #endif
  41
  42 struct _cpu {
  43
  44   /* the registers */
  45   registers regs;
  46
  47   /* current instruction address */
  48   unsigned_word program_counter;
  49
  50   /* the memory maps */
  51   core *physical; /* all of memory */
  52   vm *virtual;
  53   vm_instruction_map *instruction_map; /* instructions */
  54   vm_data_map *data_map; /* data */
  55
  56   /* current state of interrupt inputs */
  57   int external_exception_pending;
  58
  59   /* the system this processor is contained within */
  60   cpu_mon *monitor;
  61   psim *system;
  62   event_queue *events;
  63   int cpu_nr;
  64
  65   /* Current functional unit information */
  66   function_unit *func_unit;
  67
  68   /* Current CPU model information */
  69   model_data *model_ptr;
  70
  71 #if WITH_IDECODE_CACHE_SIZE
  72   /* a cache to store cracked instructions */
  73   idecode_cache icache[WITH_IDECODE_CACHE_SIZE];
  74 #endif
  75
  76   /* address reservation: keep the physical address and the contents
  77      of memory at that address */
  78   memory_reservation reservation;
  79
  80   /* offset from event time to this cpu's idea of the local time */
  81   signed64 time_base_local_time;
  82   signed64 decrementer_local_time;
  83   event_entry_tag decrementer_event;
  84
  85 };
  86
  87
  88 INLINE_CPU cpu *
  89 cpu_create(psim *system,
  90            core *memory,
  91            event_queue *events,
  92            cpu_mon *monitor,
  93            int cpu_nr)
  94 {
  95   cpu *processor = ZALLOC(cpu);
  96
  97   /* create the virtual memory map from the core */
  98   processor->physical = memory;
  99   processor->virtual = vm_create(memory);
 100   processor->instruction_map = vm_create_instruction_map(processor->virtual);
 101   processor->data_map = vm_create_data_map(processor->virtual);
 102   processor->model_ptr = model_create (processor);
 103
 104   /* link back to core system */
 105   processor->system = system;
 106   processor->events = events;
 107   processor->cpu_nr = cpu_nr;
 108   processor->monitor = monitor;
 109
 110   /* Create function unit if desired */
 111   if (WITH_FUNCTION_UNIT)
 112     processor->func_unit = function_unit_create ();
 113
 114   return processor;
 115 }
 116
 117
 118 INLINE_CPU void
 119 cpu_init(cpu *processor)
 120 {
 121   memset(&processor->regs, 0, sizeof(processor->regs));
 122   /* FIXME - should any of VM be inited also ? */
 123
 124   if (WITH_FUNCTION_UNIT)
 125     function_unit_init (processor->func_unit);
 126
 127   model_init (processor, processor->model_ptr);
 128 }
 129
 130
 131 /* find ones way home */
 132
 133 INLINE_CPU psim *
 134 cpu_system(cpu *processor)
 135 {
 136   return processor->system;
 137 }
 138
 139 INLINE_CPU int
 140 cpu_nr(cpu *processor)
 141 {
 142   return processor->cpu_nr;
 143 }
 144
 145 INLINE_CPU event_queue *
 146 cpu_event_queue(cpu *processor)
 147 {
 148   return processor->events;
 149 }
 150
 151 INLINE_CPU cpu_mon *
 152 cpu_monitor(cpu *processor)
 153 {
 154   return processor->monitor;
 155 }
 156
 157 INLINE_CPU function_unit *
 158 cpu_function_unit(cpu *processor)
 159 {
 160   return processor->func_unit;
 161 }
 162
 163 INLINE_CPU model_data *
 164 cpu_model(cpu *processor)
 165 {
 166   return processor->model_ptr;
 167 }
 168
 169 /* The processors local concept of time */
 170
 171 INLINE_CPU signed64
 172 cpu_get_time_base(cpu *processor)
 173 {
 174   return (event_queue_time(processor->events)
 175           - processor->time_base_local_time);
 176 }
 177
 178 INLINE_CPU void
 179 cpu_set_time_base(cpu *processor,
 180                   signed64 time_base)
 181 {
 182   processor->time_base_local_time = (event_queue_time(processor->events)
 183                                      - time_base);
 184 }
 185
 186 INLINE_CPU signed32
 187 cpu_get_decrementer(cpu *processor)
 188 {
 189   return (processor->decrementer_local_time
 190           - event_queue_time(processor->events));
 191 }
 192
 193 STATIC_INLINE_CPU void
 194 cpu_decrement_event(event_queue *queue,
 195                     void *data)
 196 {
 197   cpu *processor = (cpu*)data;
 198   if (!decrementer_interrupt(processor)) {
 199     processor->decrementer_event = event_queue_schedule(processor->events,
 200                                                         1, /* NOW! */
 201                                                         cpu_decrement_event,
 202                                                         processor);
 203   }
 204 }
 205
 206 INLINE_CPU void
 207 cpu_set_decrementer(cpu *processor,
 208                     signed32 decrementer)
 209 {
 210   signed64 old_decrementer = (processor->decrementer_local_time
 211                               - event_queue_time(processor->events));
 212   event_queue_deschedule(processor->events, processor->decrementer_event);
 213   processor->decrementer_local_time = (event_queue_time(processor->events)
 214                                        + decrementer);
 215   if (decrementer < 0 && old_decrementer >= 0)
 216     /* dec interrupt occures if the sign of the decrement reg is
 217        changed by the load operation */
 218     processor->decrementer_event = event_queue_schedule(processor->events,
 219                                                         1, /* NOW! */
 220                                                         cpu_decrement_event,
 221                                                         processor);
 222   else if (decrementer >= 0)
 223     processor->decrementer_event = event_queue_schedule(processor->events,
 224                                                         decrementer,
 225                                                         cpu_decrement_event,
 226                                                         processor);
 227 }
 228
 229
 230 /* program counter manipulation */
 231
 232 INLINE_CPU void
 233 cpu_set_program_counter(cpu *processor,
 234                         unsigned_word new_program_counter)
 235 {
 236   processor->program_counter = new_program_counter;
 237 }
 238
 239 INLINE_CPU unsigned_word
 240 cpu_get_program_counter(cpu *processor)
 241 {
 242   return processor->program_counter;
 243 }
 244
 245 INLINE_CPU void
 246 cpu_restart(cpu *processor,
 247             unsigned_word nia)
 248 {
 249   processor->program_counter = nia;
 250   psim_restart(processor->system, processor->cpu_nr);
 251 }
 252
 253 INLINE_CPU void
 254 cpu_halt(cpu *processor,
 255          unsigned_word cia,
 256          stop_reason reason,
 257          int signal)
 258 {
 259   if (processor == NULL) {
 260     error("cpu_halt() processor=NULL, cia=0x%x, reason=%d, signal=%d\n",
 261           cia,
 262           reason,
 263           signal);
 264   }
 265   else {
 266     if (WITH_FUNCTION_UNIT)
 267       function_unit_halt(processor, processor->func_unit);
 268
 269     model_halt(processor, processor->model_ptr);
 270     processor->program_counter = cia;
 271     psim_halt(processor->system, processor->cpu_nr, cia, reason, signal);
 272   }
 273 }
 274
 275
 276 #if WITH_IDECODE_CACHE_SIZE
 277 /* allow access to the cpu's instruction cache */
 278 INLINE_CPU idecode_cache *
 279 cpu_icache_entry(cpu *processor,
 280                  unsigned_word cia)
 281 {
 282   return &processor->icache[cia / 4 % WITH_IDECODE_CACHE_SIZE];
 283 }
 284
 285
 286 INLINE_CPU void
 287 cpu_flush_icache(cpu *processor)
 288 {
 289   int i;
 290   /* force all addresses to 0xff... so that they never hit */
 291   for (i = 0; i < WITH_IDECODE_CACHE_SIZE; i++)
 292     processor->icache[i].address = MASK(0, 63);
 293 }
 294 #endif
 295
 296
 297 /* address map revelation */
 298
 299 INLINE_CPU vm_instruction_map *
 300 cpu_instruction_map(cpu *processor)
 301 {
 302   return processor->instruction_map;
 303 }
 304
 305 INLINE_CPU vm_data_map *
 306 cpu_data_map(cpu *processor)
 307 {
 308   return processor->data_map;
 309 }
 310
 311
 312 /* reservation access */
 313
 314 INLINE_CPU memory_reservation *
 315 cpu_reservation(cpu *processor)
 316 {
 317   return &processor->reservation;
 318 }
 319
 320
 321 /* register access */
 322
 323 INLINE_CPU registers *
 324 cpu_registers(cpu *processor)
 325 {
 326   return &processor->regs;
 327 }
 328
 329 INLINE_CPU void
 330 cpu_synchronize_context(cpu *processor)
 331 {
 332 #if (WITH_IDECODE_CACHE)
 333   /* kill of the cache */
 334   cpu_flush_icache(processor);
 335 #endif
 336
 337   /* update virtual memory */
 338   vm_synchronize_context(processor->virtual,
 339                          processor->regs.spr,
 340                          processor->regs.sr,
 341                          processor->regs.msr);
 342 }
 343
 344
 345 /* might again be useful one day */
 346
 347 INLINE_CPU void
 348 cpu_print_info(cpu *processor, int verbose)
 349 {
 350 }
 351
 352 #endif /* _CPU_C_ */