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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 561:533f6b478071
prev543:361ec0a70cf2
next585:371342a39c09
author nkeynes
date Tue Jan 01 05:08:38 2008 +0000 (12 years ago)
branchlxdream-mmu
permissions -rw-r--r--
last change Enable Id keyword on all source files
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     1
/**
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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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    18
 */
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#include <errno.h>
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#include <glib.h>
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#include "dream.h"
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#include "config.h"
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#include "mem.h"
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#include "aica/aica.h"
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#include "asic.h"
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#include "dreamcast.h"
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#include "gdrom/ide.h"
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#include "maple/maple.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 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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#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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/**
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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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    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_create_repeating_ram_region( 0x0C000000, 16 MB, MEM_REGION_MAIN, 0x01000000, 0x0F000000 );
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    mem_create_ram_region( 0x00800000, 2 MB, MEM_REGION_AUDIO );
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    mem_create_ram_region( 0x00703000, 8 KB, MEM_REGION_AUDIO_SCRATCH );
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    mem_create_ram_region( 0x05000000, 8 MB, MEM_REGION_VIDEO );
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    dreamcast_has_bios = mem_load_rom( lxdream_get_config_value(CONFIG_BIOS_PATH),
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				       0x00000000, 0x00200000, 0x89f2b1a1,
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				       MEM_REGION_BIOS );
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    mem_create_ram_region( 0x00200000, 0x00020000, MEM_REGION_FLASH );
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    mem_load_block( lxdream_get_config_value(CONFIG_FLASH_PATH),
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		    0x00200000, 0x00020000 );
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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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    dreamcast_has_bios = mem_load_rom( lxdream_get_config_value(CONFIG_BIOS_PATH),
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				       0x00000000, 0x00200000, 0x89f2b1a1, 
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				       MEM_REGION_BIOS );
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    mem_load_block( lxdream_get_config_value(CONFIG_FLASH_PATH),
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		    0x00200000, 0x00020000 );
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}
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void dreamcast_save_flash()
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{
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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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 * 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_create_ram_region( 0x00800000, 2 MB, MEM_REGION_AUDIO );
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    mem_create_ram_region( 0x00703000, 8 KB, MEM_REGION_AUDIO_SCRATCH );
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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_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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    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_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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    dreamcast_state = STATE_RUNNING;
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    while( dreamcast_state == STATE_RUNNING ) {
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   151
	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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    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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}
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void dreamcast_run_for( unsigned int seconds, unsigned int nanosecs )
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{
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    int i;
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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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    dreamcast_state = STATE_RUNNING;
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    uint32_t nanos = 0;
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    if( nanosecs != 0 ) {
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        nanos = 1000000000 - nanosecs;
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	seconds++;
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    }
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    while( dreamcast_state == STATE_RUNNING && seconds != 0 ) {
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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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	nanos += time_to_run;
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	if( nanos >= 1000000000 ) {
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	    nanos -= 1000000000;
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	    seconds--;
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	}
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    }
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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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}
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void dreamcast_stop( void )
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{
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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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    dreamcast_stop();
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    dreamcast_save_flash();
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}
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void dreamcast_program_loaded( const gchar *name, sh4addr_t entry_point )
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{
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    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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    sh4_set_pc(entry_point);
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    if( !dreamcast_has_bios ) {
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        bios_install();
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    }
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    dcload_install();
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    gui_update_state();
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}
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gboolean dreamcast_is_running( void )
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{
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    return dreamcast_state == STATE_RUNNING;
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}
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gboolean dreamcast_can_run(void)
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{
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    return dreamcast_state != STATE_UNINIT &&
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      (dreamcast_has_bios || dreamcast_program_name != NULL);
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}
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/********************************* Save States *****************************/
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struct save_state_header {
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    char magic[16];
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    uint32_t version;
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    uint32_t module_count;
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};
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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 )
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{
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    struct save_state_header header;
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    if( fread( &header, sizeof(header), 1, f ) != 1 ) {
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	return 0;
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    }
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    if( strncmp( header.magic, DREAMCAST_SAVE_MAGIC, 16 ) != 0 ) {
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	ERROR( "Not a %s save state file", APP_NAME );
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	return 0;
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    }
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    if( header.version != DREAMCAST_SAVE_VERSION ) {
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	ERROR( "%s save state version not supported", APP_NAME );
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	return 0;
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   272
    }
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   273
    if( header.module_count > MAX_MODULES ) {
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   274
	ERROR( "%s save state is corrupted (bad module count)", APP_NAME );
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   275
	return 0;
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   276
    }
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   277
    return header.module_count;
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   278
}
nkeynes@477
   279
nkeynes@477
   280
int dreamcast_write_chunk_header( const gchar *name, uint32_t length, FILE *f )
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   281
{
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   282
    struct chunk_header head;
nkeynes@477
   283
nkeynes@477
   284
    memcpy( head.marker, "BLCK", 4 );
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   285
    memset( head.name, 0, 8 );
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   286
    memcpy( head.name, name, strlen(name) );
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   287
    head.block_length = length;
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   288
    return fwrite( &head, sizeof(head), 1, f );
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   289
}
nkeynes@477
   290
nkeynes@477
   291
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   292
frame_buffer_t dreamcast_load_preview( const gchar *filename )
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   293
{
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   294
    int i;
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   295
    FILE *f = fopen( filename, "r" );
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   296
    if( f == NULL ) return NULL;
nkeynes@477
   297
    
nkeynes@477
   298
    int module_count = dreamcast_read_save_state_header(f);
nkeynes@477
   299
    if( module_count <= 0 ) {
nkeynes@477
   300
	fclose(f);
nkeynes@477
   301
	return NULL;
nkeynes@477
   302
    }
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   303
    for( i=0; i<module_count; i++ ) {
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   304
	struct chunk_header head;
nkeynes@477
   305
	if( fread( &head, sizeof(head), 1, f ) != 1 ) {
nkeynes@477
   306
	    fclose(f);
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   307
	    return NULL;
nkeynes@477
   308
	}
nkeynes@477
   309
	if( memcmp("BLCK", head.marker, 4) != 0 ) {
nkeynes@477
   310
	    fclose(f);
nkeynes@477
   311
	    return NULL;
nkeynes@477
   312
	}
nkeynes@477
   313
nkeynes@477
   314
	if( strcmp("PVR2", head.name) == 0 ) {
nkeynes@477
   315
	    uint32_t buf_count;
nkeynes@477
   316
	    int has_front;
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   317
	    fread( &buf_count, sizeof(buf_count), 1, f );
nkeynes@477
   318
	    fread( &has_front, sizeof(has_front), 1, f );
nkeynes@477
   319
	    if( buf_count != 0 && has_front ) {
nkeynes@477
   320
		frame_buffer_t result = read_png_from_stream(f);
nkeynes@477
   321
		fclose(f);
nkeynes@477
   322
		return result;
nkeynes@477
   323
	    }
nkeynes@477
   324
	    break;
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   325
	} else {
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   326
	    fseek( f, head.block_length, SEEK_CUR );
nkeynes@477
   327
	}
nkeynes@477
   328
    }
nkeynes@477
   329
    return NULL;
nkeynes@477
   330
}
nkeynes@477
   331
nkeynes@18
   332
int dreamcast_load_state( const gchar *filename )
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   333
{
nkeynes@17
   334
    int i,j;
nkeynes@477
   335
    int module_count;
nkeynes@17
   336
    int have_read[MAX_MODULES];
nkeynes@18
   337
nkeynes@477
   338
    FILE *f = fopen( filename, "r" );
nkeynes@18
   339
    if( f == NULL ) return errno;
nkeynes@15
   340
nkeynes@477
   341
    module_count = dreamcast_read_save_state_header(f);
nkeynes@477
   342
    if( module_count <= 0 ) {
nkeynes@477
   343
	fclose(f);
nkeynes@17
   344
	return 1;
nkeynes@15
   345
    }
nkeynes@477
   346
nkeynes@17
   347
    for( i=0; i<MAX_MODULES; i++ ) {
nkeynes@17
   348
	have_read[i] = 0;
nkeynes@15
   349
    }
nkeynes@15
   350
nkeynes@477
   351
    for( i=0; i<module_count; i++ ) {
nkeynes@477
   352
	struct chunk_header chunk;
nkeynes@477
   353
	fread( &chunk, sizeof(chunk), 1, f );
nkeynes@477
   354
	if( strncmp(chunk.marker, "BLCK", 4) != 0 ) {
nkeynes@180
   355
	    ERROR( "%s save state is corrupted (missing block header %d)", APP_NAME, i );
nkeynes@477
   356
	    fclose(f);
nkeynes@17
   357
	    return 2;
nkeynes@17
   358
	}
nkeynes@17
   359
	
nkeynes@17
   360
	/* Find the matching module by name */
nkeynes@17
   361
	for( j=0; j<num_modules; j++ ) {
nkeynes@477
   362
	    if( strcmp(modules[j]->name,chunk.name) == 0 ) {
nkeynes@17
   363
		have_read[j] = 1;
nkeynes@17
   364
		if( modules[j]->load == NULL ) {
nkeynes@180
   365
		    ERROR( "%s save state is corrupted (no loader for %s)", APP_NAME, modules[j]->name );
nkeynes@477
   366
		    fclose(f);
nkeynes@17
   367
		    return 2;
nkeynes@17
   368
		} else if( modules[j]->load(f) != 0 ) {
nkeynes@180
   369
		    ERROR( "%s save state is corrupted (%s failed)", APP_NAME, modules[j]->name );
nkeynes@477
   370
		    fclose(f);
nkeynes@17
   371
		    return 2;
nkeynes@17
   372
		}
nkeynes@17
   373
		break;
nkeynes@17
   374
	    }
nkeynes@17
   375
	}
nkeynes@17
   376
	if( j == num_modules ) {
nkeynes@477
   377
	    fclose(f);
nkeynes@180
   378
	    ERROR( "%s save state contains unrecognized section", APP_NAME );
nkeynes@17
   379
	    return 2;
nkeynes@17
   380
	}
nkeynes@17
   381
    }
nkeynes@17
   382
    
nkeynes@17
   383
    /* Any modules that we didn't load - reset to the default state.
nkeynes@17
   384
     * (ie it's not an error to skip a module if you don't actually
nkeynes@17
   385
     * care about its state).
nkeynes@17
   386
     */
nkeynes@17
   387
    for( j=0; j<num_modules; j++ ) {
nkeynes@17
   388
	if( have_read[j] == 0 && modules[j]->reset != NULL ) {
nkeynes@17
   389
	    modules[j]->reset();
nkeynes@17
   390
	}
nkeynes@15
   391
    }
nkeynes@18
   392
    fclose(f);
nkeynes@18
   393
    INFO( "Save state read from %s", filename );
nkeynes@422
   394
    return 0;
nkeynes@15
   395
}
nkeynes@15
   396
nkeynes@18
   397
int dreamcast_save_state( const gchar *filename )
nkeynes@15
   398
{
nkeynes@15
   399
    int i;
nkeynes@18
   400
    FILE *f;
nkeynes@15
   401
    struct save_state_header header;
nkeynes@15
   402
    
nkeynes@18
   403
    f = fopen( filename, "w" );
nkeynes@18
   404
    if( f == NULL )
nkeynes@18
   405
	return errno;
nkeynes@15
   406
    strcpy( header.magic, DREAMCAST_SAVE_MAGIC );
nkeynes@15
   407
    header.version = DREAMCAST_SAVE_VERSION;
nkeynes@18
   408
    header.module_count = 0;
nkeynes@18
   409
nkeynes@18
   410
    for( i=0; i<num_modules; i++ ) {
nkeynes@18
   411
	if( modules[i]->save != NULL )
nkeynes@18
   412
	    header.module_count++;
nkeynes@18
   413
    }
nkeynes@15
   414
    fwrite( &header, sizeof(header), 1, f );
nkeynes@15
   415
    for( i=0; i<num_modules; i++ ) {
nkeynes@15
   416
	if( modules[i]->save != NULL ) {
nkeynes@477
   417
	    uint32_t blocklen, posn1, posn2;
nkeynes@477
   418
	    dreamcast_write_chunk_header( modules[i]->name, 0, f );
nkeynes@477
   419
	    posn1 = ftell(f);
nkeynes@15
   420
	    modules[i]->save(f);
nkeynes@477
   421
	    posn2 = ftell(f);
nkeynes@477
   422
	    blocklen = posn2 - posn1;
nkeynes@477
   423
	    fseek( f, posn1-4, SEEK_SET );
nkeynes@477
   424
	    fwrite( &blocklen, sizeof(blocklen), 1, f );
nkeynes@477
   425
	    fseek( f, posn2, SEEK_SET );
nkeynes@15
   426
	}
nkeynes@15
   427
    }
nkeynes@18
   428
    fclose( f );
nkeynes@18
   429
    INFO( "Save state written to %s", filename );
nkeynes@422
   430
    return 0;
nkeynes@15
   431
}
nkeynes@15
   432
.