/**

 * $Id$

 *

 * Dreamcast main SDRAM - access methods and timing controls. This is fairly

 * directly coupled to the SH4

 *

 * 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.

 */

#include "lxdream.h"

#include "mem.h"

#include "dreamcast.h"

#include "xlat/xltcache.h"

#include <string.h>

static int32_t FASTCALL ext_sdram_read_long( sh4addr_t addr )

{

    return *((int32_t *)(dc_main_ram + (addr&0x00FFFFFF)));

}

static int32_t FASTCALL ext_sdram_read_word( sh4addr_t addr )

{

    return SIGNEXT16(*((int16_t *)(dc_main_ram + (addr&0x00FFFFFF))));

}

static int32_t FASTCALL ext_sdram_read_byte( sh4addr_t addr )

{

    return SIGNEXT8(*((int16_t *)(dc_main_ram + (addr&0x00FFFFFF))));

}

static void FASTCALL ext_sdram_write_long( sh4addr_t addr, uint32_t val )

{

    *(uint32_t *)(dc_main_ram + (addr&0x00FFFFFF)) = val;

    xlat_invalidate_long(addr);

}

static void FASTCALL ext_sdram_write_word( sh4addr_t addr, uint32_t val )

{

    *(uint16_t *)(dc_main_ram + (addr&0x00FFFFFF)) = (uint16_t)val;

    xlat_invalidate_word(addr);

}

static void FASTCALL ext_sdram_write_byte( sh4addr_t addr, uint32_t val )

{

    *(uint8_t *)(dc_main_ram + (addr&0x00FFFFFF)) = (uint8_t)val;

    xlat_invalidate_word(addr);

}

static void FASTCALL ext_sdram_read_burst( unsigned char *dest, sh4addr_t addr )

{

    memcpy( dest, dc_main_ram+(addr&0x00FFFFFF), 32 );

}

static void FASTCALL ext_sdram_write_burst( sh4addr_t addr, unsigned char *src )

{

    memcpy( dc_main_ram+(addr&0x00FFFFFF), src, 32 );

}

struct mem_region_fn mem_region_sdram = { ext_sdram_read_long, ext_sdram_write_long, 

        ext_sdram_read_word, ext_sdram_write_word, 

        ext_sdram_read_byte, ext_sdram_write_byte, 

        ext_sdram_read_burst, ext_sdram_write_burst };