/**

 * $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 */

    int32_t fpul;

    float *fr_bank;

    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_set_use_xlat( gboolean use );

/**

 * Test if system is currently using the translation engine.

 */

gboolean sh4_is_using_xlat();

/**

 * 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 */