/*  This file is part of the program psim.

    Copyright (C) 1994-1995, 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_H_
#define _CPU_H_

#ifndef INLINE_CPU
#define INLINE_CPU
#endif

#include "basics.h"
#include "registers.h"
#include "device_tree.h"
#include "corefile.h"
#include "vm.h"
#include "events.h"
#include "interrupts.h"
#include "psim.h"
#include "icache.h"
#include "itable.h"
#include "mon.h"
#include "function_unit.h"


/* typedef struct _cpu cpu;

   Declared in basics.h because it is used opaquely throughout the
   code */


/* Create a cpu object */

INLINE_CPU cpu *cpu_create
(psim *system,
 core *memory,
 event_queue *events,
 cpu_mon *monitor,
 int cpu_nr);

INLINE_CPU void cpu_init
(cpu *processor);

/* Find our way home */

INLINE_CPU psim *cpu_system
(cpu *processor);

INLINE_CPU cpu_mon *cpu_monitor
(cpu *processor);

INLINE_CPU int cpu_nr
(cpu *processor);

INLINE_CPU event_queue *cpu_event_queue
(cpu *processor);


/* The processors local concept of time */

INLINE_CPU signed64 cpu_get_time_base
(cpu *processor);

INLINE_CPU void cpu_set_time_base
(cpu *processor,
 signed64 time_base);

INLINE_CPU signed32 cpu_get_decrementer
(cpu *processor);

INLINE_CPU void cpu_set_decrementer
(cpu *processor,
 signed32 decrementer);


/* manipulate the program counter

   The program counter is not included in the register file.  Instead
   it is extracted and then later restored (set, reset, halt).  This
   is to give the user of the cpu (and the compiler) the chance to
   minimize the need to load/store the cpu's PC value.  (Especially in
   the case of a single processor) */

INLINE_CPU void cpu_set_program_counter
(cpu *processor,
 unsigned_word new_program_counter);

INLINE_CPU unsigned_word cpu_get_program_counter
(cpu *processor);

INLINE_CPU void cpu_restart
(cpu *processor,
 unsigned_word nia);

INLINE_CPU void cpu_halt
(cpu *processor,
 unsigned_word nia,
 stop_reason reason,
 int signal);


#if WITH_IDECODE_CACHE_SIZE
/* Return the cache entry that matches the given CIA.  No guarentee
   that the cache entry actually contains the instruction for that
   address */

INLINE_CPU idecode_cache *cpu_icache_entry
(cpu *processor,
 unsigned_word cia);

INLINE_CPU void cpu_flush_icache
(cpu *processor);
#endif


/* reveal the processors VM:

   At first sight it may seem better to, instead of exposing the cpu's
   inner vm maps, to have the cpu its self provide memory manipulation
   functions. (eg cpu_instruction_fetch() cpu_data_read_4())

   Unfortunatly in addition to these functions is the need (for the
   debugger) to be able to read/write to memory in ways that violate
   the vm protection (eg store breakpoint instruction in the
   instruction map). */

INLINE_CPU vm_data_map *cpu_data_map
(cpu *processor);

INLINE_CPU vm_instruction_map *cpu_instruction_map
(cpu *processor);


/* grant access to the reservation information */
typedef struct _memory_reservation {
  int valid;
  unsigned_word addr;
  unsigned_word data;
} memory_reservation;

INLINE_CPU memory_reservation *cpu_reservation
(cpu *processor);


INLINE_CPU void cpu_print_info
(cpu *processor,
 int verbose);


/* Registers:

   This model exploits the PowerPC's requirement for a synchronization
   to occure after (or before) the update of any context controlling
   register.  All context sync points must call the sync function
   below to when ever a synchronization point is reached */

INLINE_CPU registers *cpu_registers
(cpu *processor);

INLINE_CPU void cpu_synchronize_context
(cpu *processor);

INLINE_CPU function_unit *cpu_function_unit
(cpu *processor);

#define IS_PROBLEM_STATE(PROCESSOR) \
(CURRENT_ENVIRONMENT == OPERATING_ENVIRONMENT \
 ? (cpu_registers(PROCESSOR)->msr & msr_problem_state) \
 : 1)

#define IS_64BIT_MODE(PROCESSOR) \
(WITH_TARGET_WORD_BITSIZE == 64 \
 ? (CURRENT_ENVIRONMENT == OPERATING_ENVIRONMENT \
    ? (cpu_registers(PROCESSOR)->msr & msr_64bit_mode) \
    : 1) \
 : 0)

#define IS_FP_AVAILABLE(PROCESSOR) \
(CURRENT_ENVIRONMENT == OPERATING_ENVIRONMENT \
 ? (cpu_registers(PROCESSOR)->msr & msr_floating_point_available) \
 : 1)

#endif