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lxdream.org :: lxdream/src/dreamcast.c
lxdream 0.9.1
released Jun 29
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filename src/dreamcast.c
changeset 953:f4a156508ad1
prev892:126aa7db6162
next1034:7044e01148f0
author nkeynes
date Tue Jan 13 11:56:28 2009 +0000 (13 years ago)
permissions -rw-r--r--
last change Merge lxdream-mem branch back to trunk
file annotate diff log raw
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/**
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 * $Id$
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 * Central switchboard for the system. This pulls all the individual modules
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 * together into some kind of coherent structure. This is also where you'd
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 * add Naomi support, if I ever get a board to play with...
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 *
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 * Copyright (c) 2005 Nathan Keynes.
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 *
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 * This program is free software; you can redistribute it and/or modify
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 * it under the terms of the GNU General Public License as published by
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 * the Free Software Foundation; either version 2 of the License, or
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 * (at your option) any later version.
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 *
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 * This program is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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 * GNU General Public License for more details.
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 */
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#include <errno.h>
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#include <glib.h>
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#include "lxdream.h"
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#include "dream.h"
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#include "mem.h"
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#include "dreamcast.h"
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#include "asic.h"
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#include "syscall.h"
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#include "gui.h"
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#include "aica/aica.h"
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#include "gdrom/ide.h"
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#include "maple/maple.h"
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#include "pvr2/pvr2.h"
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#include "sh4/sh4.h"
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#include "sh4/sh4core.h"
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/**
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 * Current state of the DC virtual machine
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 */
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typedef enum { STATE_UNINIT=0, STATE_RUNNING, 
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               STATE_STOPPING, STATE_STOPPED } dreamcast_state_t;
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static volatile dreamcast_state_t dreamcast_state = STATE_UNINIT;
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static gboolean dreamcast_has_bios = FALSE;
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static gboolean dreamcast_has_flash = FALSE;
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static gboolean dreamcast_exit_on_stop = FALSE;
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static gchar *dreamcast_program_name = NULL;
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static sh4addr_t dreamcast_entry_point = 0xA0000000;
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static uint32_t timeslice_length = DEFAULT_TIMESLICE_LENGTH;
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static uint64_t run_time_nanosecs = 0;
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#define MAX_MODULES 32
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static int num_modules = 0;
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dreamcast_module_t modules[MAX_MODULES];
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/**
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 * The unknown module is used for logging files without an actual module
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 * declaration
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 */
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struct dreamcast_module unknown_module = { "****", NULL, NULL, NULL, NULL, 
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        NULL, NULL, NULL };
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extern struct mem_region_fn mem_region_sdram;
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extern struct mem_region_fn mem_region_vram32;
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extern struct mem_region_fn mem_region_vram64;
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extern struct mem_region_fn mem_region_audioram;
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extern struct mem_region_fn mem_region_audioscratch;
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extern struct mem_region_fn mem_region_flashram;
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extern struct mem_region_fn mem_region_bootrom;
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extern struct mem_region_fn mem_region_pvr2ta;
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extern struct mem_region_fn mem_region_pvr2yuv;
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extern struct mem_region_fn mem_region_pvr2vdma1;
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extern struct mem_region_fn mem_region_pvr2vdma2;
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unsigned char dc_main_ram[16 MB];
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unsigned char dc_boot_rom[2 MB];
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unsigned char dc_flash_ram[128 KB];
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/**
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 * This function is responsible for defining how all the pieces of the
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 * dreamcast actually fit together. 
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 *
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 * Note currently the locations of the various MMIO pages are hard coded in
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 * the MMIO definitions - they should probably be moved here.
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 */
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void dreamcast_configure( )
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{
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    const char *bios_path = lxdream_get_config_value(CONFIG_BIOS_PATH);
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    const char *flash_path = lxdream_get_config_value(CONFIG_FLASH_PATH);
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    dreamcast_register_module( &eventq_module );
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    /* Register the memory framework */
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    dreamcast_register_module( &mem_module );
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    /* Setup standard memory map */
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    mem_map_region( dc_boot_rom,     0x00000000, 2 MB,   MEM_REGION_BIOS,         &mem_region_bootrom, MEM_FLAG_ROM, 2 MB, 0 );
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    mem_map_region( dc_flash_ram,    0x00200000, 128 KB, MEM_REGION_FLASH,        &mem_region_flashram, MEM_FLAG_RAM, 128 KB, 0 );
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    mem_map_region( aica_main_ram,   0x00800000, 2 MB,   MEM_REGION_AUDIO,        &mem_region_audioram, MEM_FLAG_RAM, 2 MB, 0 );
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    mem_map_region( aica_scratch_ram,0x00703000, 8 KB,   MEM_REGION_AUDIO_SCRATCH,&mem_region_audioscratch, MEM_FLAG_RAM, 8 KB, 0 );
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    mem_map_region( NULL,            0x04000000, 8 MB,   MEM_REGION_VIDEO64,      &mem_region_vram64, 0, 8 MB, 0 );
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    mem_map_region( pvr2_main_ram,   0x05000000, 8 MB,   MEM_REGION_VIDEO,        &mem_region_vram32, MEM_FLAG_RAM, 8 MB, 0 ); 
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    mem_map_region( dc_main_ram,     0x0C000000, 16 MB,  MEM_REGION_MAIN,         &mem_region_sdram, MEM_FLAG_RAM, 0x01000000, 0x0F000000 );
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    mem_map_region( NULL,            0x10000000, 8 MB,   MEM_REGION_PVR2TA,       &mem_region_pvr2ta, 0, 0x02000000, 0x12000000 );
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    mem_map_region( NULL,            0x10800000, 8 MB,   MEM_REGION_PVR2YUV,      &mem_region_pvr2yuv, 0, 0x02000000, 0x12800000 );
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    mem_map_region( NULL,            0x11000000, 16 MB,  MEM_REGION_PVR2VDMA1,    &mem_region_pvr2vdma1, 0, 16 MB, 0 );
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    mem_map_region( NULL,            0x13000000, 16 MB,  MEM_REGION_PVR2VDMA2,    &mem_region_pvr2vdma2, 0, 16 MB, 0 );
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    dreamcast_has_bios = mem_load_rom( dc_boot_rom, bios_path, 2 MB, 0x89f2b1a1 );
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    if( flash_path != NULL && flash_path[0] != '\0' ) {
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        mem_load_block( flash_path, 0x00200000, 0x00020000 );
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    }
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    dreamcast_has_flash = TRUE;
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    /* Load in the rest of the core modules */
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    dreamcast_register_module( &sh4_module );
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    dreamcast_register_module( &asic_module );
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    dreamcast_register_module( &pvr2_module );
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    dreamcast_register_module( &aica_module );
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    dreamcast_register_module( &maple_module );
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    dreamcast_register_module( &ide_module );
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}
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void dreamcast_config_changed(void)
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{
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    const char *bios_path = lxdream_get_config_value(CONFIG_BIOS_PATH);
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    const char *flash_path = lxdream_get_config_value(CONFIG_FLASH_PATH);
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    dreamcast_has_bios = mem_load_rom( dc_boot_rom, bios_path, 2 MB, 0x89f2b1a1 );
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    if( flash_path != NULL && flash_path[0] != '\0' ) {
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        mem_load_block( flash_path, 0x00200000, 0x00020000 );
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    }
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}
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void dreamcast_save_flash()
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{
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    if( dreamcast_has_flash ) {
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        const char *file = lxdream_get_config_value(CONFIG_FLASH_PATH);
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        mem_save_block( file, 0x00200000, 0x00020000 );
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    }
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}
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/**
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 * Constructs a system configuration for the AICA in standalone mode,
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 * ie sound chip only.
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 */
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void dreamcast_configure_aica_only( )
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{
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    dreamcast_register_module( &mem_module );
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    mem_map_region( aica_main_ram, 0x00800000, 2 MB, MEM_REGION_AUDIO, &mem_region_audioram, MEM_FLAG_RAM, 2 MB, 0 );
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    mem_map_region( aica_scratch_ram, 0x00703000, 8 KB, MEM_REGION_AUDIO_SCRATCH, &mem_region_audioscratch, MEM_FLAG_RAM, 8 KB, 0 );
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    dreamcast_register_module( &aica_module );
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    aica_enable();
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    dreamcast_state = STATE_STOPPED;
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}
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void dreamcast_register_module( dreamcast_module_t module ) 
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{
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    modules[num_modules++] = module;
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    if( module->init != NULL )
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        module->init();
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}
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void dreamcast_set_run_time( uint32_t secs, uint32_t nanosecs )
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{
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    run_time_nanosecs = (((uint64_t)secs) * 1000000000) + nanosecs;
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}
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void dreamcast_set_exit_on_stop( gboolean flag )
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{
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    dreamcast_exit_on_stop = flag;
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}
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void dreamcast_init( void )
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{
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    dreamcast_configure();
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    dreamcast_state = STATE_STOPPED;
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}
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void dreamcast_reset( void )
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{
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    sh4_core_exit(CORE_EXIT_SYSRESET);
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    int i;
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    for( i=0; i<num_modules; i++ ) {
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        if( modules[i]->reset != NULL )
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            modules[i]->reset();
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    }
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}
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void dreamcast_run( void )
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{
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    int i;
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    if( !dreamcast_can_run() ) {
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        ERROR(_("No program is loaded, and no BIOS is configured (required to boot a CD image). To continue, either load a binary program, or set the path to your BIOS file in the Path Preferences"));
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        return;
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    }
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    if( dreamcast_state != STATE_RUNNING ) {
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        for( i=0; i<num_modules; i++ ) {
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            if( modules[i]->start != NULL )
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                modules[i]->start();
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        }
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    }
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    if( maple_should_grab() ) {
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        gui_set_use_grab(TRUE);
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    }
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    dreamcast_state = STATE_RUNNING;
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    if( run_time_nanosecs != 0 ) {
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        while( dreamcast_state == STATE_RUNNING ) {
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            uint32_t time_to_run = timeslice_length;
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            if( run_time_nanosecs < time_to_run ) {
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                time_to_run = (uint32_t)run_time_nanosecs;
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            }
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            for( i=0; i<num_modules; i++ ) {
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                if( modules[i]->run_time_slice != NULL )
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                    time_to_run = modules[i]->run_time_slice( time_to_run );
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            }
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            if( run_time_nanosecs > time_to_run ) {
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                run_time_nanosecs -= time_to_run;
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            } else {
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                run_time_nanosecs = 0; // Finished
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                break;
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            }
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        }
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    } else {
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        while( dreamcast_state == STATE_RUNNING ) {
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            int time_to_run = timeslice_length;
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            for( i=0; i<num_modules; i++ ) {
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                if( modules[i]->run_time_slice != NULL )
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                    time_to_run = modules[i]->run_time_slice( time_to_run );
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            }
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        }
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    }
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    gui_set_use_grab(FALSE);
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    for( i=0; i<num_modules; i++ ) {
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        if( modules[i]->stop != NULL )
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            modules[i]->stop();
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    }
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    dreamcast_state = STATE_STOPPED;
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    if( dreamcast_exit_on_stop ) {
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        dreamcast_shutdown();
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        exit(0);
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    }
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}
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void dreamcast_stop( void )
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{
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    sh4_core_exit(CORE_EXIT_HALT); // returns only if not inside SH4 core
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    if( dreamcast_state == STATE_RUNNING )
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        dreamcast_state = STATE_STOPPING;
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}
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void dreamcast_shutdown()
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{
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    // Don't do a dreamcast_stop - if we're calling this out of SH4 code,
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    // it's a shutdown-and-quit event
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    if( dreamcast_state == STATE_RUNNING )
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        dreamcast_state = STATE_STOPPING;
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    dreamcast_save_flash();
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#ifdef ENABLE_SH4STATS
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    sh4_stats_print(stdout);
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#endif
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   270
}
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void dreamcast_program_loaded( const gchar *name, sh4addr_t entry_point )
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   273
{
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   274
    if( dreamcast_program_name != NULL ) {
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        g_free(dreamcast_program_name);
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    }
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    dreamcast_program_name = g_strdup(name);
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    dreamcast_entry_point = entry_point;
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   279
    sh4_set_pc(entry_point);
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    sh4_write_sr( sh4_read_sr() & (~SR_BL) ); /* Unmask interrupts */
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    bios_install();
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    dcload_install();
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    gui_update_state();
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   284
}
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   286
gboolean dreamcast_is_running( void )
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   287
{
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   288
    return dreamcast_state == STATE_RUNNING;
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   289
}
nkeynes@26
   290
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   291
gboolean dreamcast_can_run(void)
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   292
{
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   293
    return dreamcast_state != STATE_UNINIT &&
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   294
    (dreamcast_has_bios || dreamcast_program_name != NULL);
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}
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   296
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   297
/********************************* Save States *****************************/
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struct save_state_header {
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    char magic[16];
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   301
    uint32_t version;
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    uint32_t module_count;
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};
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   304
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struct chunk_header {
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    char marker[4]; /* Always BLCK */
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    char name[8]; /* Block (module) name */
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    uint32_t block_length;
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};
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/**
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 * Check the save state header to ensure that it is a valid, supported
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 * file. 
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 * @return the number of blocks following, or 0 if the file is invalid.
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 */
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int dreamcast_read_save_state_header( FILE *f, char *error, int errorlen )
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   317
{
nkeynes@477
   318
    struct save_state_header header;
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   319
    if( fread( &header, sizeof(header), 1, f ) != 1 ) {
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        return 0;
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   321
    }
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    if( strncmp( header.magic, DREAMCAST_SAVE_MAGIC, 16 ) != 0 ) {
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    	if( error != NULL )
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    		snprintf( error, errorlen, _("File is not a %s save state"), APP_NAME );
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   325
        return 0;
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   326
    }
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   327
    if( header.version != DREAMCAST_SAVE_VERSION ) {
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   328
    	if( error != NULL )
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   329
    		snprintf( error, errorlen, _("Unsupported %s save state version"), APP_NAME );
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   330
        return 0;
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   331
    }
nkeynes@477
   332
    if( header.module_count > MAX_MODULES ) {
nkeynes@891
   333
    	if( error != NULL )
nkeynes@891
   334
    		snprintf( error, errorlen, _("%s save state is corrupted (bad module count)"), APP_NAME );
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   335
        return 0;
nkeynes@477
   336
    }
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   337
    return header.module_count;
nkeynes@477
   338
}
nkeynes@477
   339
nkeynes@477
   340
int dreamcast_write_chunk_header( const gchar *name, uint32_t length, FILE *f )
nkeynes@477
   341
{
nkeynes@477
   342
    struct chunk_header head;
nkeynes@477
   343
nkeynes@477
   344
    memcpy( head.marker, "BLCK", 4 );
nkeynes@477
   345
    memset( head.name, 0, 8 );
nkeynes@477
   346
    memcpy( head.name, name, strlen(name) );
nkeynes@477
   347
    head.block_length = length;
nkeynes@477
   348
    return fwrite( &head, sizeof(head), 1, f );
nkeynes@477
   349
}
nkeynes@477
   350
nkeynes@477
   351
nkeynes@477
   352
frame_buffer_t dreamcast_load_preview( const gchar *filename )
nkeynes@477
   353
{
nkeynes@477
   354
    int i;
nkeynes@477
   355
    FILE *f = fopen( filename, "r" );
nkeynes@477
   356
    if( f == NULL ) return NULL;
nkeynes@736
   357
nkeynes@891
   358
    int module_count = dreamcast_read_save_state_header(f, NULL, 0);
nkeynes@477
   359
    if( module_count <= 0 ) {
nkeynes@736
   360
        fclose(f);
nkeynes@736
   361
        return NULL;
nkeynes@477
   362
    }
nkeynes@477
   363
    for( i=0; i<module_count; i++ ) {
nkeynes@736
   364
        struct chunk_header head;
nkeynes@736
   365
        if( fread( &head, sizeof(head), 1, f ) != 1 ) {
nkeynes@736
   366
            fclose(f);
nkeynes@736
   367
            return NULL;
nkeynes@736
   368
        }
nkeynes@736
   369
        if( memcmp("BLCK", head.marker, 4) != 0 ) {
nkeynes@736
   370
            fclose(f);
nkeynes@736
   371
            return NULL;
nkeynes@736
   372
        }
nkeynes@477
   373
nkeynes@736
   374
        if( strcmp("PVR2", head.name) == 0 ) {
nkeynes@736
   375
            uint32_t buf_count;
nkeynes@736
   376
            int has_front;
nkeynes@736
   377
            fread( &buf_count, sizeof(buf_count), 1, f );
nkeynes@736
   378
            fread( &has_front, sizeof(has_front), 1, f );
nkeynes@736
   379
            if( buf_count != 0 && has_front ) {
nkeynes@736
   380
                frame_buffer_t result = read_png_from_stream(f);
nkeynes@736
   381
                fclose(f);
nkeynes@736
   382
                return result;
nkeynes@736
   383
            }
nkeynes@736
   384
            break;
nkeynes@736
   385
        } else {
nkeynes@736
   386
            fseek( f, head.block_length, SEEK_CUR );
nkeynes@736
   387
        }
nkeynes@477
   388
    }
nkeynes@477
   389
    return NULL;
nkeynes@477
   390
}
nkeynes@477
   391
nkeynes@18
   392
int dreamcast_load_state( const gchar *filename )
nkeynes@15
   393
{
nkeynes@17
   394
    int i,j;
nkeynes@477
   395
    int module_count;
nkeynes@891
   396
    char error[128];
nkeynes@17
   397
    int have_read[MAX_MODULES];
nkeynes@18
   398
nkeynes@477
   399
    FILE *f = fopen( filename, "r" );
nkeynes@18
   400
    if( f == NULL ) return errno;
nkeynes@15
   401
nkeynes@891
   402
    module_count = dreamcast_read_save_state_header(f, error, sizeof(error));
nkeynes@477
   403
    if( module_count <= 0 ) {
nkeynes@891
   404
    	ERROR( error );
nkeynes@736
   405
        fclose(f);
nkeynes@736
   406
        return 1;
nkeynes@15
   407
    }
nkeynes@477
   408
nkeynes@17
   409
    for( i=0; i<MAX_MODULES; i++ ) {
nkeynes@736
   410
        have_read[i] = 0;
nkeynes@15
   411
    }
nkeynes@15
   412
nkeynes@477
   413
    for( i=0; i<module_count; i++ ) {
nkeynes@736
   414
        struct chunk_header chunk;
nkeynes@736
   415
        fread( &chunk, sizeof(chunk), 1, f );
nkeynes@736
   416
        if( strncmp(chunk.marker, "BLCK", 4) != 0 ) {
nkeynes@736
   417
            ERROR( "%s save state is corrupted (missing block header %d)", APP_NAME, i );
nkeynes@736
   418
            fclose(f);
nkeynes@736
   419
            return 2;
nkeynes@736
   420
        }
nkeynes@736
   421
nkeynes@736
   422
        /* Find the matching module by name */
nkeynes@736
   423
        for( j=0; j<num_modules; j++ ) {
nkeynes@736
   424
            if( strcmp(modules[j]->name,chunk.name) == 0 ) {
nkeynes@736
   425
                have_read[j] = 1;
nkeynes@736
   426
                if( modules[j]->load == NULL ) {
nkeynes@736
   427
                    ERROR( "%s save state is corrupted (no loader for %s)", APP_NAME, modules[j]->name );
nkeynes@736
   428
                    fclose(f);
nkeynes@736
   429
                    return 2;
nkeynes@736
   430
                } else if( modules[j]->load(f) != 0 ) {
nkeynes@736
   431
                    ERROR( "%s save state is corrupted (%s failed)", APP_NAME, modules[j]->name );
nkeynes@736
   432
                    fclose(f);
nkeynes@736
   433
                    return 2;
nkeynes@736
   434
                }
nkeynes@736
   435
                break;
nkeynes@736
   436
            }
nkeynes@736
   437
        }
nkeynes@736
   438
        if( j == num_modules ) {
nkeynes@736
   439
            fclose(f);
nkeynes@736
   440
            ERROR( "%s save state contains unrecognized section", APP_NAME );
nkeynes@736
   441
            return 2;
nkeynes@736
   442
        }
nkeynes@17
   443
    }
nkeynes@736
   444
nkeynes@17
   445
    /* Any modules that we didn't load - reset to the default state.
nkeynes@17
   446
     * (ie it's not an error to skip a module if you don't actually
nkeynes@17
   447
     * care about its state).
nkeynes@17
   448
     */
nkeynes@17
   449
    for( j=0; j<num_modules; j++ ) {
nkeynes@736
   450
        if( have_read[j] == 0 && modules[j]->reset != NULL ) {
nkeynes@736
   451
            modules[j]->reset();
nkeynes@736
   452
        }
nkeynes@15
   453
    }
nkeynes@18
   454
    fclose(f);
nkeynes@18
   455
    INFO( "Save state read from %s", filename );
nkeynes@422
   456
    return 0;
nkeynes@15
   457
}
nkeynes@15
   458
nkeynes@18
   459
int dreamcast_save_state( const gchar *filename )
nkeynes@15
   460
{
nkeynes@15
   461
    int i;
nkeynes@18
   462
    FILE *f;
nkeynes@15
   463
    struct save_state_header header;
nkeynes@736
   464
nkeynes@18
   465
    f = fopen( filename, "w" );
nkeynes@18
   466
    if( f == NULL )
nkeynes@736
   467
        return errno;
nkeynes@15
   468
    strcpy( header.magic, DREAMCAST_SAVE_MAGIC );
nkeynes@15
   469
    header.version = DREAMCAST_SAVE_VERSION;
nkeynes@18
   470
    header.module_count = 0;
nkeynes@18
   471
nkeynes@18
   472
    for( i=0; i<num_modules; i++ ) {
nkeynes@736
   473
        if( modules[i]->save != NULL )
nkeynes@736
   474
            header.module_count++;
nkeynes@18
   475
    }
nkeynes@15
   476
    fwrite( &header, sizeof(header), 1, f );
nkeynes@15
   477
    for( i=0; i<num_modules; i++ ) {
nkeynes@736
   478
        if( modules[i]->save != NULL ) {
nkeynes@736
   479
            uint32_t blocklen, posn1, posn2;
nkeynes@736
   480
            dreamcast_write_chunk_header( modules[i]->name, 0, f );
nkeynes@736
   481
            posn1 = ftell(f);
nkeynes@736
   482
            modules[i]->save(f);
nkeynes@736
   483
            posn2 = ftell(f);
nkeynes@736
   484
            blocklen = posn2 - posn1;
nkeynes@736
   485
            fseek( f, posn1-4, SEEK_SET );
nkeynes@736
   486
            fwrite( &blocklen, sizeof(blocklen), 1, f );
nkeynes@736
   487
            fseek( f, posn2, SEEK_SET );
nkeynes@736
   488
        }
nkeynes@15
   489
    }
nkeynes@18
   490
    fclose( f );
nkeynes@18
   491
    INFO( "Save state written to %s", filename );
nkeynes@422
   492
    return 0;
nkeynes@15
   493
}
nkeynes@15
   494
nkeynes@953
   495
/********************* The Boot ROM address space **********************/
nkeynes@953
   496
static int32_t FASTCALL ext_bootrom_read_long( sh4addr_t addr )
nkeynes@953
   497
{
nkeynes@953
   498
    return *((int32_t *)(dc_boot_rom + (addr&0x001FFFFF)));
nkeynes@953
   499
}
nkeynes@953
   500
static int32_t FASTCALL ext_bootrom_read_word( sh4addr_t addr )
nkeynes@953
   501
{
nkeynes@953
   502
    return SIGNEXT16(*((int16_t *)(dc_boot_rom + (addr&0x001FFFFF))));
nkeynes@953
   503
}
nkeynes@953
   504
static int32_t FASTCALL ext_bootrom_read_byte( sh4addr_t addr )
nkeynes@953
   505
{
nkeynes@953
   506
    return SIGNEXT8(*((int16_t *)(dc_boot_rom + (addr&0x001FFFFF))));
nkeynes@953
   507
}
nkeynes@953
   508
static void FASTCALL ext_bootrom_read_burst( unsigned char *dest, sh4addr_t addr )
nkeynes@953
   509
{
nkeynes@953
   510
    memcpy( dest, dc_boot_rom +(addr&0x001FFFFF), 32 );
nkeynes@953
   511
}
nkeynes@953
   512
nkeynes@953
   513
struct mem_region_fn mem_region_bootrom = { 
nkeynes@953
   514
        ext_bootrom_read_long, unmapped_write_long, 
nkeynes@953
   515
        ext_bootrom_read_word, unmapped_write_long, 
nkeynes@953
   516
        ext_bootrom_read_byte, unmapped_write_long, 
nkeynes@953
   517
        ext_bootrom_read_burst, unmapped_write_burst }; 
nkeynes@953
   518
nkeynes@953
   519
/********************* The Flash RAM address space **********************/
nkeynes@953
   520
static int32_t FASTCALL ext_flashram_read_long( sh4addr_t addr )
nkeynes@953
   521
{
nkeynes@953
   522
    return *((int32_t *)(dc_flash_ram + (addr&0x0001FFFF)));
nkeynes@953
   523
}
nkeynes@953
   524
static int32_t FASTCALL ext_flashram_read_word( sh4addr_t addr )
nkeynes@953
   525
{
nkeynes@953
   526
    return SIGNEXT16(*((int16_t *)(dc_flash_ram + (addr&0x0001FFFF))));
nkeynes@953
   527
}
nkeynes@953
   528
static int32_t FASTCALL ext_flashram_read_byte( sh4addr_t addr )
nkeynes@953
   529
{
nkeynes@953
   530
    return SIGNEXT8(*((int16_t *)(dc_flash_ram + (addr&0x0001FFFF))));
nkeynes@953
   531
}
nkeynes@953
   532
static void FASTCALL ext_flashram_write_long( sh4addr_t addr, uint32_t val )
nkeynes@953
   533
{
nkeynes@953
   534
    *(uint32_t *)(dc_flash_ram + (addr&0x0001FFFF)) = val;
nkeynes@953
   535
    asic_g2_write_word();
nkeynes@953
   536
}
nkeynes@953
   537
static void FASTCALL ext_flashram_write_word( sh4addr_t addr, uint32_t val )
nkeynes@953
   538
{
nkeynes@953
   539
    *(uint16_t *)(dc_flash_ram + (addr&0x0001FFFF)) = (uint16_t)val;
nkeynes@953
   540
    asic_g2_write_word();
nkeynes@953
   541
}
nkeynes@953
   542
static void FASTCALL ext_flashram_write_byte( sh4addr_t addr, uint32_t val )
nkeynes@953
   543
{
nkeynes@953
   544
    *(uint8_t *)(dc_flash_ram + (addr&0x0001FFFF)) = (uint8_t)val;
nkeynes@953
   545
    asic_g2_write_word();
nkeynes@953
   546
}
nkeynes@953
   547
static void FASTCALL ext_flashram_read_burst( unsigned char *dest, sh4addr_t addr )
nkeynes@953
   548
{
nkeynes@953
   549
    memcpy( dest, dc_flash_ram+(addr&0x0001FFFF), 32 );
nkeynes@953
   550
}
nkeynes@953
   551
static void FASTCALL ext_flashram_write_burst( sh4addr_t addr, unsigned char *src )
nkeynes@953
   552
{
nkeynes@953
   553
    memcpy( dc_flash_ram+(addr&0x0001FFFF), src, 32 );
nkeynes@953
   554
}
nkeynes@953
   555
nkeynes@953
   556
struct mem_region_fn mem_region_flashram = { ext_flashram_read_long, ext_flashram_write_long, 
nkeynes@953
   557
        ext_flashram_read_word, ext_flashram_write_word, 
nkeynes@953
   558
        ext_flashram_read_byte, ext_flashram_write_byte, 
nkeynes@953
   559
        ext_flashram_read_burst, ext_flashram_write_burst }; 
nkeynes@953
   560
.