/**

  * $Id: sh4.h 577 2008-01-01 05:08:38Z nkeynes $

  * 

  * This file defines the public functions and definitions exported by the SH4

  * modules.

  *

  * Copyright (c) 2005 Nathan Keynes.

  *

  * 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.

  */

 #ifndef lxdream_sh4_H

 #define lxdream_sh4_H 1

 #include "lxdream.h"

 #include "mem.h"

 #ifdef __cplusplus

 extern "C" {

 #endif

 /**

  * SH4 is running normally 

  */

 #define SH4_STATE_RUNNING 1

 /**

  * SH4 is not executing instructions but all peripheral modules are still

  * running

  */

 #define SH4_STATE_SLEEP 2

 /**

  * SH4 is not executing instructions, DMAC is halted, but all other peripheral

  * modules are still running

  */

 #define SH4_STATE_DEEP_SLEEP 3

 /**

  * SH4 is not executing instructions and all peripheral modules are also

  * stopped. As close as you can get to powered-off without actually being

  * off.

  */

 #define SH4_STATE_STANDBY 4

 /**

  * sh4r.event_types flag indicating a pending IRQ

  */

 #define PENDING_IRQ 1

 /**

  * sh4r.event_types flag indicating a pending event (from the event queue)

  */

 #define PENDING_EVENT 2

 /**

  * SH4 register structure

  */

 struct sh4_registers {

     uint32_t r[16];

     uint32_t sr, pr, pc, fpscr;

     uint32_t t, m, q, s; /* really boolean - 0 or 1 */

     union {

         int32_t i;

         float f;

     } fpul;

     uint32_t pad; // FIXME: remove in next DST version

     float fr[2][16];

     uint64_t mac;

     uint32_t gbr, ssr, spc, sgr, dbr, vbr;

     uint32_t r_bank[8]; /* hidden banked registers */

     int32_t store_queue[16]; /* technically 2 banks of 32 bytes */

     uint32_t new_pc; /* Not a real register, but used to handle delay slots */

     uint32_t event_pending; /* slice cycle time of the next pending event, or FFFFFFFF

                              when no events are pending */

     uint32_t event_types; /* bit 0 = IRQ pending, bit 1 = general event pending */

     int in_delay_slot; /* flag to indicate the current instruction is in

      * a delay slot (certain rules apply) */

     uint32_t slice_cycle; /* Current nanosecond within the timeslice */

     int sh4_state; /* Current power-on state (one of the SH4_STATE_* values ) */

 };

 extern struct sh4_registers sh4r;

 /**

  * Switch between translation and emulation execution modes. Note that this

  * should only be used while the system is stopped. If the system was built

  * without translation support, this method has no effect.

  *

  * @param use TRUE for translation mode, FALSE for emulation mode.

  */

 void sh4_translate_set_enabled( gboolean use );

 /**

  * Test if system is currently using the translation engine.

  */

 gboolean sh4_translate_is_enabled();

 /**

  * Explicitly set the SH4 PC to the supplied value - this will be the next

  * instruction executed. This should only be called while the system is stopped.

  */

 void sh4_set_pc( int pc );

 /**

  * Execute (using the emulator) a single instruction (in other words, perform a

  * single-step operation). 

  */

 gboolean sh4_execute_instruction( void );

 /* SH4 breakpoints */

 void sh4_set_breakpoint( uint32_t pc, breakpoint_type_t type );

 gboolean sh4_clear_breakpoint( uint32_t pc, breakpoint_type_t type );

 int sh4_get_breakpoint( uint32_t pc );

 #ifdef __cplusplus

 }

 #endif

 #endif /* !lxdream_sh4_H */