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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 1038:f220d18c0615
prev1036:af7b0c5905dd
next1041:5fcc39857c5c
author nkeynes
date Thu Jun 25 01:15:25 2009 +0000 (13 years ago)
permissions -rw-r--r--
last change Move configuration to .lxdream/lxdreamrc on *nix, Library/Application Support/Lxdream on OS X
Create standard directories on first run
Add current quick state to config file
Refactor quick-state handling into dreamcast.c, and use the save directory
file annotate diff log raw
nkeynes@26
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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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    18
 */
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#include <errno.h>
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#include <glib.h>
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#include <unistd.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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#include "vmu/vmulist.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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static unsigned int quick_save_state = -1;
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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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    char *bios_path = lxdream_get_global_config_path_value(CONFIG_BIOS_PATH);
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    char *flash_path = lxdream_get_global_config_path_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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    g_free(bios_path);
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    g_free(flash_path);
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}
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void dreamcast_config_changed(void)
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{
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    char *bios_path = lxdream_get_global_config_path_value(CONFIG_BIOS_PATH);
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    char *flash_path = lxdream_get_global_config_path_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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    g_free(bios_path);
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    g_free(flash_path);
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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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        char *file = lxdream_get_global_config_path_value(CONFIG_FLASH_PATH);
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        mem_save_block( file, 0x00200000, 0x00020000 );
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        g_free(file);
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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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   244
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   245
        }
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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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   253
    }
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    vmulist_save_all();
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    dreamcast_state = STATE_STOPPED;
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   257
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   258
    if( dreamcast_exit_on_stop ) {
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        dreamcast_shutdown();
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   260
        exit(0);
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   261
    }
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   262
}
nkeynes@372
   263
nkeynes@23
   264
void dreamcast_stop( void )
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   265
{
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   266
    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;
nkeynes@23
   269
}
nkeynes@17
   270
nkeynes@277
   271
void dreamcast_shutdown()
nkeynes@277
   272
{
nkeynes@727
   273
    // Don't do a dreamcast_stop - if we're calling this out of SH4 code,
nkeynes@727
   274
    // it's a shutdown-and-quit event
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   275
    if( dreamcast_state == STATE_RUNNING )
nkeynes@727
   276
        dreamcast_state = STATE_STOPPING;
nkeynes@277
   277
    dreamcast_save_flash();
nkeynes@1034
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    vmulist_save_all();
nkeynes@671
   279
#ifdef ENABLE_SH4STATS
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    sh4_stats_print(stdout);
nkeynes@671
   281
#endif
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   282
}
nkeynes@277
   283
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   284
void dreamcast_program_loaded( const gchar *name, sh4addr_t entry_point )
nkeynes@543
   285
{
nkeynes@543
   286
    if( dreamcast_program_name != NULL ) {
nkeynes@543
   287
        g_free(dreamcast_program_name);
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   288
    }
nkeynes@543
   289
    dreamcast_program_name = g_strdup(name);
nkeynes@543
   290
    dreamcast_entry_point = entry_point;
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   291
    sh4_set_pc(entry_point);
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   292
    sh4_write_sr( sh4_read_sr() & (~SR_BL) ); /* Unmask interrupts */
nkeynes@586
   293
    bios_install();
nkeynes@543
   294
    dcload_install();
nkeynes@543
   295
    gui_update_state();
nkeynes@543
   296
}
nkeynes@543
   297
nkeynes@26
   298
gboolean dreamcast_is_running( void )
nkeynes@26
   299
{
nkeynes@26
   300
    return dreamcast_state == STATE_RUNNING;
nkeynes@26
   301
}
nkeynes@26
   302
nkeynes@543
   303
gboolean dreamcast_can_run(void)
nkeynes@543
   304
{
nkeynes@543
   305
    return dreamcast_state != STATE_UNINIT &&
nkeynes@736
   306
    (dreamcast_has_bios || dreamcast_program_name != NULL);
nkeynes@543
   307
}
nkeynes@543
   308
nkeynes@26
   309
/********************************* Save States *****************************/
nkeynes@26
   310
nkeynes@26
   311
struct save_state_header {
nkeynes@26
   312
    char magic[16];
nkeynes@26
   313
    uint32_t version;
nkeynes@26
   314
    uint32_t module_count;
nkeynes@26
   315
};
nkeynes@26
   316
nkeynes@477
   317
struct chunk_header {
nkeynes@477
   318
    char marker[4]; /* Always BLCK */
nkeynes@477
   319
    char name[8]; /* Block (module) name */
nkeynes@477
   320
    uint32_t block_length;
nkeynes@477
   321
};
nkeynes@477
   322
nkeynes@477
   323
/**
nkeynes@477
   324
 * Check the save state header to ensure that it is a valid, supported
nkeynes@477
   325
 * file. 
nkeynes@477
   326
 * @return the number of blocks following, or 0 if the file is invalid.
nkeynes@477
   327
 */
nkeynes@891
   328
int dreamcast_read_save_state_header( FILE *f, char *error, int errorlen )
nkeynes@477
   329
{
nkeynes@477
   330
    struct save_state_header header;
nkeynes@477
   331
    if( fread( &header, sizeof(header), 1, f ) != 1 ) {
nkeynes@736
   332
        return 0;
nkeynes@477
   333
    }
nkeynes@477
   334
    if( strncmp( header.magic, DREAMCAST_SAVE_MAGIC, 16 ) != 0 ) {
nkeynes@891
   335
    	if( error != NULL )
nkeynes@891
   336
    		snprintf( error, errorlen, _("File is not a %s save state"), APP_NAME );
nkeynes@736
   337
        return 0;
nkeynes@477
   338
    }
nkeynes@477
   339
    if( header.version != DREAMCAST_SAVE_VERSION ) {
nkeynes@891
   340
    	if( error != NULL )
nkeynes@892
   341
    		snprintf( error, errorlen, _("Unsupported %s save state version"), APP_NAME );
nkeynes@736
   342
        return 0;
nkeynes@477
   343
    }
nkeynes@477
   344
    if( header.module_count > MAX_MODULES ) {
nkeynes@891
   345
    	if( error != NULL )
nkeynes@891
   346
    		snprintf( error, errorlen, _("%s save state is corrupted (bad module count)"), APP_NAME );
nkeynes@736
   347
        return 0;
nkeynes@477
   348
    }
nkeynes@477
   349
    return header.module_count;
nkeynes@477
   350
}
nkeynes@477
   351
nkeynes@477
   352
int dreamcast_write_chunk_header( const gchar *name, uint32_t length, FILE *f )
nkeynes@477
   353
{
nkeynes@477
   354
    struct chunk_header head;
nkeynes@477
   355
nkeynes@477
   356
    memcpy( head.marker, "BLCK", 4 );
nkeynes@477
   357
    memset( head.name, 0, 8 );
nkeynes@477
   358
    memcpy( head.name, name, strlen(name) );
nkeynes@477
   359
    head.block_length = length;
nkeynes@477
   360
    return fwrite( &head, sizeof(head), 1, f );
nkeynes@477
   361
}
nkeynes@477
   362
nkeynes@477
   363
nkeynes@477
   364
frame_buffer_t dreamcast_load_preview( const gchar *filename )
nkeynes@477
   365
{
nkeynes@477
   366
    int i;
nkeynes@477
   367
    FILE *f = fopen( filename, "r" );
nkeynes@477
   368
    if( f == NULL ) return NULL;
nkeynes@736
   369
nkeynes@891
   370
    int module_count = dreamcast_read_save_state_header(f, NULL, 0);
nkeynes@477
   371
    if( module_count <= 0 ) {
nkeynes@736
   372
        fclose(f);
nkeynes@736
   373
        return NULL;
nkeynes@477
   374
    }
nkeynes@477
   375
    for( i=0; i<module_count; i++ ) {
nkeynes@736
   376
        struct chunk_header head;
nkeynes@736
   377
        if( fread( &head, sizeof(head), 1, f ) != 1 ) {
nkeynes@736
   378
            fclose(f);
nkeynes@736
   379
            return NULL;
nkeynes@736
   380
        }
nkeynes@736
   381
        if( memcmp("BLCK", head.marker, 4) != 0 ) {
nkeynes@736
   382
            fclose(f);
nkeynes@736
   383
            return NULL;
nkeynes@736
   384
        }
nkeynes@477
   385
nkeynes@736
   386
        if( strcmp("PVR2", head.name) == 0 ) {
nkeynes@736
   387
            uint32_t buf_count;
nkeynes@736
   388
            int has_front;
nkeynes@736
   389
            fread( &buf_count, sizeof(buf_count), 1, f );
nkeynes@736
   390
            fread( &has_front, sizeof(has_front), 1, f );
nkeynes@736
   391
            if( buf_count != 0 && has_front ) {
nkeynes@736
   392
                frame_buffer_t result = read_png_from_stream(f);
nkeynes@736
   393
                fclose(f);
nkeynes@736
   394
                return result;
nkeynes@736
   395
            }
nkeynes@736
   396
            break;
nkeynes@736
   397
        } else {
nkeynes@736
   398
            fseek( f, head.block_length, SEEK_CUR );
nkeynes@736
   399
        }
nkeynes@477
   400
    }
nkeynes@477
   401
    return NULL;
nkeynes@477
   402
}
nkeynes@477
   403
nkeynes@18
   404
int dreamcast_load_state( const gchar *filename )
nkeynes@15
   405
{
nkeynes@17
   406
    int i,j;
nkeynes@477
   407
    int module_count;
nkeynes@891
   408
    char error[128];
nkeynes@17
   409
    int have_read[MAX_MODULES];
nkeynes@18
   410
nkeynes@477
   411
    FILE *f = fopen( filename, "r" );
nkeynes@18
   412
    if( f == NULL ) return errno;
nkeynes@15
   413
nkeynes@891
   414
    module_count = dreamcast_read_save_state_header(f, error, sizeof(error));
nkeynes@477
   415
    if( module_count <= 0 ) {
nkeynes@891
   416
    	ERROR( error );
nkeynes@736
   417
        fclose(f);
nkeynes@736
   418
        return 1;
nkeynes@15
   419
    }
nkeynes@477
   420
nkeynes@17
   421
    for( i=0; i<MAX_MODULES; i++ ) {
nkeynes@736
   422
        have_read[i] = 0;
nkeynes@15
   423
    }
nkeynes@15
   424
nkeynes@477
   425
    for( i=0; i<module_count; i++ ) {
nkeynes@736
   426
        struct chunk_header chunk;
nkeynes@736
   427
        fread( &chunk, sizeof(chunk), 1, f );
nkeynes@736
   428
        if( strncmp(chunk.marker, "BLCK", 4) != 0 ) {
nkeynes@736
   429
            ERROR( "%s save state is corrupted (missing block header %d)", APP_NAME, i );
nkeynes@736
   430
            fclose(f);
nkeynes@736
   431
            return 2;
nkeynes@736
   432
        }
nkeynes@736
   433
nkeynes@736
   434
        /* Find the matching module by name */
nkeynes@736
   435
        for( j=0; j<num_modules; j++ ) {
nkeynes@736
   436
            if( strcmp(modules[j]->name,chunk.name) == 0 ) {
nkeynes@736
   437
                have_read[j] = 1;
nkeynes@736
   438
                if( modules[j]->load == NULL ) {
nkeynes@736
   439
                    ERROR( "%s save state is corrupted (no loader for %s)", APP_NAME, modules[j]->name );
nkeynes@736
   440
                    fclose(f);
nkeynes@736
   441
                    return 2;
nkeynes@736
   442
                } else if( modules[j]->load(f) != 0 ) {
nkeynes@736
   443
                    ERROR( "%s save state is corrupted (%s failed)", APP_NAME, modules[j]->name );
nkeynes@736
   444
                    fclose(f);
nkeynes@736
   445
                    return 2;
nkeynes@736
   446
                }
nkeynes@736
   447
                break;
nkeynes@736
   448
            }
nkeynes@736
   449
        }
nkeynes@736
   450
        if( j == num_modules ) {
nkeynes@736
   451
            fclose(f);
nkeynes@736
   452
            ERROR( "%s save state contains unrecognized section", APP_NAME );
nkeynes@736
   453
            return 2;
nkeynes@736
   454
        }
nkeynes@17
   455
    }
nkeynes@736
   456
nkeynes@17
   457
    /* Any modules that we didn't load - reset to the default state.
nkeynes@17
   458
     * (ie it's not an error to skip a module if you don't actually
nkeynes@17
   459
     * care about its state).
nkeynes@17
   460
     */
nkeynes@17
   461
    for( j=0; j<num_modules; j++ ) {
nkeynes@736
   462
        if( have_read[j] == 0 && modules[j]->reset != NULL ) {
nkeynes@736
   463
            modules[j]->reset();
nkeynes@736
   464
        }
nkeynes@15
   465
    }
nkeynes@18
   466
    fclose(f);
nkeynes@18
   467
    INFO( "Save state read from %s", filename );
nkeynes@422
   468
    return 0;
nkeynes@15
   469
}
nkeynes@15
   470
nkeynes@18
   471
int dreamcast_save_state( const gchar *filename )
nkeynes@15
   472
{
nkeynes@15
   473
    int i;
nkeynes@18
   474
    FILE *f;
nkeynes@15
   475
    struct save_state_header header;
nkeynes@736
   476
nkeynes@18
   477
    f = fopen( filename, "w" );
nkeynes@18
   478
    if( f == NULL )
nkeynes@736
   479
        return errno;
nkeynes@15
   480
    strcpy( header.magic, DREAMCAST_SAVE_MAGIC );
nkeynes@15
   481
    header.version = DREAMCAST_SAVE_VERSION;
nkeynes@18
   482
    header.module_count = 0;
nkeynes@18
   483
nkeynes@18
   484
    for( i=0; i<num_modules; i++ ) {
nkeynes@736
   485
        if( modules[i]->save != NULL )
nkeynes@736
   486
            header.module_count++;
nkeynes@18
   487
    }
nkeynes@15
   488
    fwrite( &header, sizeof(header), 1, f );
nkeynes@15
   489
    for( i=0; i<num_modules; i++ ) {
nkeynes@736
   490
        if( modules[i]->save != NULL ) {
nkeynes@736
   491
            uint32_t blocklen, posn1, posn2;
nkeynes@736
   492
            dreamcast_write_chunk_header( modules[i]->name, 0, f );
nkeynes@736
   493
            posn1 = ftell(f);
nkeynes@736
   494
            modules[i]->save(f);
nkeynes@736
   495
            posn2 = ftell(f);
nkeynes@736
   496
            blocklen = posn2 - posn1;
nkeynes@736
   497
            fseek( f, posn1-4, SEEK_SET );
nkeynes@736
   498
            fwrite( &blocklen, sizeof(blocklen), 1, f );
nkeynes@736
   499
            fseek( f, posn2, SEEK_SET );
nkeynes@736
   500
        }
nkeynes@15
   501
    }
nkeynes@18
   502
    fclose( f );
nkeynes@18
   503
    INFO( "Save state written to %s", filename );
nkeynes@422
   504
    return 0;
nkeynes@15
   505
}
nkeynes@15
   506
nkeynes@1038
   507
/********************** Quick save state support ***********************/
nkeynes@1038
   508
/* This section doesn't necessarily belong here, but it probably makes the
nkeynes@1038
   509
 * most sense here next to the regular save/load functions
nkeynes@1038
   510
 */
nkeynes@1038
   511
nkeynes@1038
   512
static gchar *get_quick_state_filename( int state )
nkeynes@1038
   513
{
nkeynes@1038
   514
    gchar *path = lxdream_get_global_config_path_value(CONFIG_SAVE_PATH);
nkeynes@1038
   515
    gchar *str = g_strdup_printf( QUICK_STATE_FILENAME, path, state );
nkeynes@1038
   516
    g_free( path );
nkeynes@1038
   517
    return str;
nkeynes@1038
   518
}
nkeynes@1038
   519
nkeynes@1038
   520
nkeynes@1038
   521
static void dreamcast_quick_state_init()
nkeynes@1038
   522
{
nkeynes@1038
   523
    const char *state = lxdream_get_global_config_value(CONFIG_QUICK_STATE);
nkeynes@1038
   524
    if( state != NULL ) {
nkeynes@1038
   525
        quick_save_state = atoi(state);
nkeynes@1038
   526
        if( quick_save_state > MAX_QUICK_STATE ) {
nkeynes@1038
   527
            quick_save_state = 0;
nkeynes@1038
   528
        }
nkeynes@1038
   529
    } else {
nkeynes@1038
   530
        quick_save_state = 0;
nkeynes@1038
   531
    }
nkeynes@1038
   532
}
nkeynes@1038
   533
nkeynes@1038
   534
void dreamcast_quick_save()
nkeynes@1038
   535
{
nkeynes@1038
   536
    if( quick_save_state == -1 ) 
nkeynes@1038
   537
        dreamcast_quick_state_init();
nkeynes@1038
   538
    gchar *str = get_quick_state_filename(quick_save_state);
nkeynes@1038
   539
    dreamcast_save_state(str);
nkeynes@1038
   540
    g_free(str);
nkeynes@1038
   541
}
nkeynes@1038
   542
nkeynes@1038
   543
void dreamcast_quick_load()
nkeynes@1038
   544
{
nkeynes@1038
   545
    if( quick_save_state == -1 ) 
nkeynes@1038
   546
        dreamcast_quick_state_init();
nkeynes@1038
   547
    gchar *str = get_quick_state_filename(quick_save_state);
nkeynes@1038
   548
    dreamcast_load_state(str);
nkeynes@1038
   549
    g_free(str);
nkeynes@1038
   550
}
nkeynes@1038
   551
nkeynes@1038
   552
unsigned int dreamcast_get_quick_state( )
nkeynes@1038
   553
{
nkeynes@1038
   554
    if( quick_save_state == -1 ) 
nkeynes@1038
   555
        dreamcast_quick_state_init();
nkeynes@1038
   556
    return quick_save_state;
nkeynes@1038
   557
}
nkeynes@1038
   558
nkeynes@1038
   559
void dreamcast_set_quick_state( unsigned int state )
nkeynes@1038
   560
{
nkeynes@1038
   561
    if( state <= MAX_QUICK_STATE && state != quick_save_state ) {
nkeynes@1038
   562
        quick_save_state = state;
nkeynes@1038
   563
        char buf[3];
nkeynes@1038
   564
        sprintf( buf, "%d", quick_save_state );
nkeynes@1038
   565
        lxdream_set_global_config_value(CONFIG_QUICK_STATE, buf);
nkeynes@1038
   566
        lxdream_save_config();
nkeynes@1038
   567
    }
nkeynes@1038
   568
}
nkeynes@1038
   569
nkeynes@1038
   570
gboolean dreamcast_has_quick_state( unsigned int state )
nkeynes@1038
   571
{
nkeynes@1038
   572
    gchar *str = get_quick_state_filename(state);
nkeynes@1038
   573
    int result = access(str, R_OK);
nkeynes@1038
   574
    g_free(str);
nkeynes@1038
   575
    return result == 0 ? TRUE : FALSE;
nkeynes@1038
   576
}
nkeynes@1038
   577
nkeynes@953
   578
/********************* The Boot ROM address space **********************/
nkeynes@953
   579
static int32_t FASTCALL ext_bootrom_read_long( sh4addr_t addr )
nkeynes@953
   580
{
nkeynes@953
   581
    return *((int32_t *)(dc_boot_rom + (addr&0x001FFFFF)));
nkeynes@953
   582
}
nkeynes@953
   583
static int32_t FASTCALL ext_bootrom_read_word( sh4addr_t addr )
nkeynes@953
   584
{
nkeynes@953
   585
    return SIGNEXT16(*((int16_t *)(dc_boot_rom + (addr&0x001FFFFF))));
nkeynes@953
   586
}
nkeynes@953
   587
static int32_t FASTCALL ext_bootrom_read_byte( sh4addr_t addr )
nkeynes@953
   588
{
nkeynes@953
   589
    return SIGNEXT8(*((int16_t *)(dc_boot_rom + (addr&0x001FFFFF))));
nkeynes@953
   590
}
nkeynes@953
   591
static void FASTCALL ext_bootrom_read_burst( unsigned char *dest, sh4addr_t addr )
nkeynes@953
   592
{
nkeynes@953
   593
    memcpy( dest, dc_boot_rom +(addr&0x001FFFFF), 32 );
nkeynes@953
   594
}
nkeynes@953
   595
nkeynes@953
   596
struct mem_region_fn mem_region_bootrom = { 
nkeynes@953
   597
        ext_bootrom_read_long, unmapped_write_long, 
nkeynes@953
   598
        ext_bootrom_read_word, unmapped_write_long, 
nkeynes@953
   599
        ext_bootrom_read_byte, unmapped_write_long, 
nkeynes@953
   600
        ext_bootrom_read_burst, unmapped_write_burst }; 
nkeynes@953
   601
nkeynes@953
   602
/********************* The Flash RAM address space **********************/
nkeynes@953
   603
static int32_t FASTCALL ext_flashram_read_long( sh4addr_t addr )
nkeynes@953
   604
{
nkeynes@953
   605
    return *((int32_t *)(dc_flash_ram + (addr&0x0001FFFF)));
nkeynes@953
   606
}
nkeynes@953
   607
static int32_t FASTCALL ext_flashram_read_word( sh4addr_t addr )
nkeynes@953
   608
{
nkeynes@953
   609
    return SIGNEXT16(*((int16_t *)(dc_flash_ram + (addr&0x0001FFFF))));
nkeynes@953
   610
}
nkeynes@953
   611
static int32_t FASTCALL ext_flashram_read_byte( sh4addr_t addr )
nkeynes@953
   612
{
nkeynes@953
   613
    return SIGNEXT8(*((int16_t *)(dc_flash_ram + (addr&0x0001FFFF))));
nkeynes@953
   614
}
nkeynes@953
   615
static void FASTCALL ext_flashram_write_long( sh4addr_t addr, uint32_t val )
nkeynes@953
   616
{
nkeynes@953
   617
    *(uint32_t *)(dc_flash_ram + (addr&0x0001FFFF)) = val;
nkeynes@953
   618
    asic_g2_write_word();
nkeynes@953
   619
}
nkeynes@953
   620
static void FASTCALL ext_flashram_write_word( sh4addr_t addr, uint32_t val )
nkeynes@953
   621
{
nkeynes@953
   622
    *(uint16_t *)(dc_flash_ram + (addr&0x0001FFFF)) = (uint16_t)val;
nkeynes@953
   623
    asic_g2_write_word();
nkeynes@953
   624
}
nkeynes@953
   625
static void FASTCALL ext_flashram_write_byte( sh4addr_t addr, uint32_t val )
nkeynes@953
   626
{
nkeynes@953
   627
    *(uint8_t *)(dc_flash_ram + (addr&0x0001FFFF)) = (uint8_t)val;
nkeynes@953
   628
    asic_g2_write_word();
nkeynes@953
   629
}
nkeynes@953
   630
static void FASTCALL ext_flashram_read_burst( unsigned char *dest, sh4addr_t addr )
nkeynes@953
   631
{
nkeynes@953
   632
    memcpy( dest, dc_flash_ram+(addr&0x0001FFFF), 32 );
nkeynes@953
   633
}
nkeynes@953
   634
static void FASTCALL ext_flashram_write_burst( sh4addr_t addr, unsigned char *src )
nkeynes@953
   635
{
nkeynes@953
   636
    memcpy( dc_flash_ram+(addr&0x0001FFFF), src, 32 );
nkeynes@953
   637
}
nkeynes@953
   638
nkeynes@953
   639
struct mem_region_fn mem_region_flashram = { ext_flashram_read_long, ext_flashram_write_long, 
nkeynes@953
   640
        ext_flashram_read_word, ext_flashram_write_word, 
nkeynes@953
   641
        ext_flashram_read_byte, ext_flashram_write_byte, 
nkeynes@953
   642
        ext_flashram_read_burst, ext_flashram_write_burst }; 
nkeynes@953
   643
.