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/*  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 2 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, write to the Free Software

    Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.

    */

#ifndef _CPU_C_

#define _CPU_C_

#include <setjmp.h>

#include "cpu.h"

#include "idecode.h"

#ifdef HAVE_STRING_H

#include <string.h>

#else

#ifdef HAVE_STRINGS_H

#include <strings.h>

#endif

#endif

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_ */