/**

 * $Id: sh4mem.c,v 1.1 2005-12-11 05:15:36 nkeynes Exp $

 * sh4mem.c is responsible for the SH4's access to memory (including memory

 * mapped I/O), using the page maps created in mem.c

 *

 * 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 <string.h>

#include <zlib.h>

#include "dream.h"

#include "mem.h"

#include "mmio.h"

#include "sh4mmio.h"

#include "dreamcast.h"

#define OC_BASE 0x1C000000

#define OC_TOP  0x20000000

#define TRANSLATE_VIDEO_64BIT_ADDRESS(a)  ( (((a)&0x00FFFFF8)>>1)|(((a)&0x00000004)<<20)|((a)&0x03)|0x05000000 );

#ifdef ENABLE_WATCH

#define CHECK_READ_WATCH( addr, size ) \

    if( mem_is_watched(addr,size,WATCH_READ) != NULL ) { \

        WARN( "Watch triggered at %08X by %d byte read", addr, size ); \

        dreamcast_stop(); \

    }

#define CHECK_WRITE_WATCH( addr, size, val )                  \

    if( mem_is_watched(addr,size,WATCH_WRITE) != NULL ) { \

        WARN( "Watch triggered at %08X by %d byte write <= %0*X", addr, size, size*2, val ); \

        dreamcast_stop(); \

    }

#else

#define CHECK_READ_WATCH( addr, size )

#define CHECK_WRITE_WATCH( addr, size )

#endif

#define TRACE_IO( str, p, r, ... ) if(io_rgn[(uint32_t)p]->trace_flag) \

TRACE( str " [%s.%s: %s]", __VA_ARGS__, \

    MMIO_NAME_BYNUM((uint32_t)p), MMIO_REGID_BYNUM((uint32_t)p, r), \

    MMIO_REGDESC_BYNUM((uint32_t)p, r) )

extern struct mem_region mem_rgn[];

extern struct mmio_region *P4_io[];

int32_t sh4_read_p4( uint32_t addr )

{

    struct mmio_region *io = P4_io[(addr&0x1FFFFFFF)>>19];

    if( !io ) {

        ERROR( "Attempted read from unknown P4 region: %08X", addr );

        return 0;

    } else {

        return io->io_read( addr&0xFFF );

    }    

}

void sh4_write_p4( uint32_t addr, int32_t val )

{

    struct mmio_region *io = P4_io[(addr&0x1FFFFFFF)>>19];

    if( !io ) {

        if( (addr & 0xFC000000) == 0xE0000000 ) {

            /* Store queue */

            SH4_WRITE_STORE_QUEUE( addr, val );

        } else {

            ERROR( "Attempted write to unknown P4 region: %08X", addr );

        }

    } else {

        io->io_write( addr&0xFFF, val );

    }

}

int32_t sh4_read_phys_word( uint32_t addr )

{

    char *page;

    if( addr > 0xE0000000 ) /* P4 Area, handled specially */

        return SIGNEXT16(sh4_read_p4( addr ));

    if( (addr&0x1F800000) == 0x04000000 ) {

        addr = TRANSLATE_VIDEO_64BIT_ADDRESS(addr);

    }

    page = page_map[ (addr & 0x1FFFFFFF) >> 12 ];

    if( ((uint32_t)page) < MAX_IO_REGIONS ) { /* IO Region */

        if( page == NULL ) {

            ERROR( "Attempted word read to missing page: %08X",

                   addr );

            return 0;

        }

        return SIGNEXT16(io_rgn[(uint32_t)page]->io_read(addr&0xFFF));

    } else {

        return SIGNEXT16(*(int16_t *)(page+(addr&0xFFF)));

    }

}

int32_t sh4_read_long( uint32_t addr )

{

    char *page;

    CHECK_READ_WATCH(addr,4);

    if( addr > 0xE0000000 ) /* P4 Area, handled specially */

        return sh4_read_p4( addr );

    if( (addr&0x1F800000) == 0x04000000 ) {

        addr = TRANSLATE_VIDEO_64BIT_ADDRESS(addr);

    }

    if( IS_MMU_ENABLED() ) {

        ERROR( "user-mode & mmu translation not implemented, aborting", NULL );

        sh4_stop();

        return 0;

    }

    page = page_map[ (addr & 0x1FFFFFFF) >> 12 ];

    if( ((uint32_t)page) < MAX_IO_REGIONS ) { /* IO Region */

        int32_t val;

        if( page == NULL ) {

            ERROR( "Attempted long read to missing page: %08X", addr );

            return 0;

        }

        val = io_rgn[(uint32_t)page]->io_read(addr&0xFFF);

        TRACE_IO( "Long read %08X <= %08X", page, (addr&0xFFF), val, addr );

        return val;

    } else {

        return *(int32_t *)(page+(addr&0xFFF));

    }

}

int32_t sh4_read_word( uint32_t addr )

{

    char *page;

    CHECK_READ_WATCH(addr,2);

    if( addr > 0xE0000000 ) /* P4 Area, handled specially */

        return SIGNEXT16(sh4_read_p4( addr ));

    if( (addr&0x1F800000) == 0x04000000 ) {

        addr = TRANSLATE_VIDEO_64BIT_ADDRESS(addr);

    }

    if( IS_MMU_ENABLED() ) {

        ERROR( "user-mode & mmu translation not implemented, aborting", NULL );

        sh4_stop();

        return 0;

    }

    page = page_map[ (addr & 0x1FFFFFFF) >> 12 ];

    if( ((uint32_t)page) < MAX_IO_REGIONS ) { /* IO Region */

        int32_t val;

        if( page == NULL ) {

            ERROR( "Attempted word read to missing page: %08X", addr );

            return 0;

        }

        val = SIGNEXT16(io_rgn[(uint32_t)page]->io_read(addr&0xFFF));

        TRACE_IO( "Word read %04X <= %08X", page, (addr&0xFFF), val&0xFFFF, addr );

        return val;

    } else {

        return SIGNEXT16(*(int16_t *)(page+(addr&0xFFF)));

    }

}

int32_t sh4_read_byte( uint32_t addr )

{

    char *page;

    CHECK_READ_WATCH(addr,1);

    if( addr > 0xE0000000 ) /* P4 Area, handled specially */

        return SIGNEXT8(sh4_read_p4( addr ));

    if( (addr&0x1F800000) == 0x04000000 ) {

        addr = TRANSLATE_VIDEO_64BIT_ADDRESS(addr);

    }

    if( IS_MMU_ENABLED() ) {

        ERROR( "user-mode & mmu translation not implemented, aborting", NULL );

        sh4_stop();

        return 0;

    }

    page = page_map[ (addr & 0x1FFFFFFF) >> 12 ];

    if( ((uint32_t)page) < MAX_IO_REGIONS ) { /* IO Region */

        int32_t val;

        if( page == NULL ) {

            ERROR( "Attempted byte read to missing page: %08X", addr );

            return 0;

        }

        val = SIGNEXT8(io_rgn[(uint32_t)page]->io_read(addr&0xFFF));

        TRACE_IO( "Byte read %02X <= %08X", page, (addr&0xFFF), val&0xFF, addr );

        return val;

    } else {

        return SIGNEXT8(*(int8_t *)(page+(addr&0xFFF)));

    }

}

void sh4_write_long( uint32_t addr, uint32_t val )

{

    char *page;

    CHECK_WRITE_WATCH(addr,4,val);

    if( addr > 0xE0000000 ) {

        sh4_write_p4( addr, val );

        return;

    }

    if( (addr&0x1F800000) == 0x04000000 ) {

        addr = TRANSLATE_VIDEO_64BIT_ADDRESS(addr);

    }

    if( IS_MMU_ENABLED() ) {

        ERROR( "user-mode & mmu translation not implemented, aborting", NULL );

        sh4_stop();

        return;

    }

    if( (addr&0x1FFFFFFF) < 0x200000 ) {

        ERROR( "Attempted write to read-only memory: %08X => %08X", val, addr);

        sh4_stop();

        return;

    }

    page = page_map[ (addr & 0x1FFFFFFF) >> 12 ];

    if( ((uint32_t)page) < MAX_IO_REGIONS ) { /* IO Region */

        if( page == NULL ) {

            ERROR( "Long write to missing page: %08X => %08X", val, addr );

            return;

        }

        TRACE_IO( "Long write %08X => %08X", page, (addr&0xFFF), val, addr );

        io_rgn[(uint32_t)page]->io_write(addr&0xFFF, val);

    } else {

        *(uint32_t *)(page+(addr&0xFFF)) = val;

    }

}

void sh4_write_word( uint32_t addr, uint32_t val )

{

    char *page;

    CHECK_WRITE_WATCH(addr,2,val);

    if( addr > 0xE0000000 ) {

        sh4_write_p4( addr, (int16_t)val );

        return;

    }

    if( (addr&0x1F800000) == 0x04000000 ) {

        addr = TRANSLATE_VIDEO_64BIT_ADDRESS(addr);

    }

    if( IS_MMU_ENABLED() ) {

        ERROR( "user-mode & mmu translation not implemented, aborting", NULL );

        sh4_stop();

        return;

    }

    page = page_map[ (addr & 0x1FFFFFFF) >> 12 ];

    if( ((uint32_t)page) < MAX_IO_REGIONS ) { /* IO Region */

        if( page == NULL ) {

            ERROR( "Attempted word write to missing page: %08X", addr );

            return;

        }

        TRACE_IO( "Word write %04X => %08X", page, (addr&0xFFF), val&0xFFFF, addr );

        io_rgn[(uint32_t)page]->io_write(addr&0xFFF, val);

    } else {

        *(uint16_t *)(page+(addr&0xFFF)) = val;

    }

}

void sh4_write_byte( uint32_t addr, uint32_t val )

{

    char *page;

    CHECK_WRITE_WATCH(addr,1,val);

    if( addr > 0xE0000000 ) {

        sh4_write_p4( addr, (int8_t)val );

        return;

    }

    if( (addr&0x1F800000) == 0x04000000 ) {

        addr = TRANSLATE_VIDEO_64BIT_ADDRESS(addr);

    }

    if( IS_MMU_ENABLED() ) {

        ERROR( "user-mode & mmu translation not implemented, aborting", NULL );

        sh4_stop();

        return;

    }

    page = page_map[ (addr & 0x1FFFFFFF) >> 12 ];

    if( ((uint32_t)page) < MAX_IO_REGIONS ) { /* IO Region */

        if( page == NULL ) {

            ERROR( "Attempted byte write to missing page: %08X", addr );

            return;

        }

        TRACE_IO( "Byte write %02X => %08X", page, (addr&0xFFF), val&0xFF, addr );

        io_rgn[(uint32_t)page]->io_write( (addr&0xFFF), val);

    } else {

        *(uint8_t *)(page+(addr&0xFFF)) = val;

    }

}

/* FIXME: Handle all the many special cases when the range doesn't fall cleanly

 * into the same memory black

 */

void mem_copy_from_sh4( char *dest, uint32_t srcaddr, size_t count ) {

    char *src = mem_get_region(srcaddr);

    memcpy( dest, src, count );

}

void mem_copy_to_sh4( uint32_t destaddr, char *src, size_t count ) {

    char *dest = mem_get_region(destaddr);

    memcpy( dest, src, count );

}