mirror of
https://github.com/RetroDECK/Supermodel.git
synced 2025-02-17 01:45:41 +00:00
c73cb830dc
- Added a 68K interface, CPU/68K/M68K.*. - Moved Turbo68K source files to CPU/68K/Turbo68K. It is no longer used but is being retained in the source tree for now. The LSR instruction has not been fixed in this update. - Changed sound board code to use the new 68K interface (and hence, Musashi). - Changed version string from 0.2-WIP to 0.2a-WIP. This is still an alpha version. - Above changes have broken the 68K debugger.
451 lines
11 KiB
C++
451 lines
11 KiB
C++
/**
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** Supermodel
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** A Sega Model 3 Arcade Emulator.
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** Copyright 2011 Bart Trzynadlowski
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**
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** This file is part of Supermodel.
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**
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** Supermodel is free software: you can redistribute it and/or modify it under
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** the terms of the GNU General Public License as published by the Free
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** Software Foundation, either version 3 of the License, or (at your option)
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** any later version.
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**
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** Supermodel is distributed in the hope that it will be useful, but WITHOUT
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** ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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** FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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** more details.
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**
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** You should have received a copy of the GNU General Public License along
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** with Supermodel. If not, see <http://www.gnu.org/licenses/>.
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**/
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/*
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* SoundBoard.cpp
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*
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* Model 3 sound board. Implementation of the CSoundBoard class. This class can
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* only be instantiated once because it relies on global variables (the non-OOP
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* 68K core).
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*/
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#include "Supermodel.h"
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//TEMP: these need to be dynamically allocated in the memory pool
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static INT16 leftBuffer[44100/60],rightBuffer[44100/60];
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static FILE *soundFP;
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/******************************************************************************
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68K Access Handlers
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******************************************************************************/
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// Memory regions passed out of CSoundBoard object for global access handlers
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static UINT8 *sbRAM1, *sbRAM2;
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static const UINT8 *sbSoundROM, *sbSampleROM;
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static UINT8 Read8(UINT32 a)
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{
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// SCSP RAM 1
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if ((a >= 0x000000) && (a <= 0x0FFFFF))
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return sbRAM1[a^1];
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// SCSP RAM 2
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else if ((a >= 0x200000) && (a <= 0x2FFFFF))
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return sbRAM2[(a-0x200000)^1];
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// Program ROM
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else if ((a >= 0x600000) && (a <= 0x67FFFF))
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return sbSoundROM[(a-0x600000)^1];
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// Sample ROM (low 2MB, fixed)
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else if ((a >= 0x800000) && (a <= 0x9FFFFF))
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return sbSampleROM[(a-0x800000)^1];
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// Sample ROM (bank)
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else if ((a >= 0xA00000) && (a <= 0xDFFFFF))
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return sbSampleROM[(a-0x800000)^1];
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// Sample ROM (bank)
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else if ((a >= 0xE00000) && (a <= 0xFFFFFF))
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return sbSampleROM[(a-0x800000)^1];
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// SCSP (Master)
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else if ((a >= 0x100000) && (a <= 0x10FFFF))
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return SCSP_Master_r8(a);
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// SCSP (Slave)
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else if ((a >= 0x300000) && (a <= 0x30FFFF))
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return SCSP_Slave_r8(a);
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// Unknown
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else
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{
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printf("68K: Unknown read8 %06X\n", a);
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return 0;
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}
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}
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static UINT16 Read16(UINT32 a)
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{
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// SCSP RAM 1
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if ((a >= 0x000000) && (a <= 0x0FFFFF))
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return *(UINT16 *) &sbRAM1[a];
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// SCSP RAM 2
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else if ((a >= 0x200000) && (a <= 0x2FFFFF))
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return *(UINT16 *) &sbRAM2[(a-0x200000)];
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// Program ROM
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else if ((a >= 0x600000) && (a <= 0x67FFFF))
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return *(UINT16 *) &sbSoundROM[(a-0x600000)];
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// Sample ROM (low 2MB, fixed)
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else if ((a >= 0x800000) && (a <= 0x9FFFFF))
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return *(UINT16 *) &sbSampleROM[(a-0x800000)];
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// Sample ROM (bank)
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else if ((a >= 0xA00000) && (a <= 0xDFFFFF))
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return *(UINT16 *) &sbSampleROM[(a-0x800000)];
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// Sample ROM (bank)
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else if ((a >= 0xE00000) && (a <= 0xFFFFFF))
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return *(UINT16 *) &sbSampleROM[(a-0x800000)];
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// SCSP (Master)
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else if ((a >= 0x100000) && (a <= 0x10FFFF))
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return SCSP_Master_r16(a);
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// SCSP (Slave)
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else if ((a >= 0x300000) && (a <= 0x30FFFF))
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return SCSP_Slave_r16(a);
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// Unknown
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else
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{
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printf("68K: Unknown read16 %06X\n", a);
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return 0;
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}
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}
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static UINT32 Read32(UINT32 a)
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{
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// SCSP RAM 1
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if ((a >= 0x000000) && (a <= 0x0FFFFF))
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return (Read16(a)<<16)|Read16(a+2);
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// SCSP RAM 2
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else if ((a >= 0x200000) && (a <= 0x2FFFFF))
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return (Read16(a)<<16)|Read16(a+2);
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// Program ROM
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else if ((a >= 0x600000) && (a <= 0x67FFFF))
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return (Read16(a)<<16)|Read16(a+2);
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// Sample ROM (low 2MB, fixed)
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else if ((a >= 0x800000) && (a <= 0x9FFFFF))
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return (Read16(a)<<16)|Read16(a+2);
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// Sample ROM (bank)
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else if ((a >= 0xA00000) && (a <= 0xDFFFFF))
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return (Read16(a)<<16)|Read16(a+2);
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// Sample ROM (bank)
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else if ((a >= 0xE00000) && (a <= 0xFFFFFF))
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return (Read16(a)<<16)|Read16(a+2);
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// SCSP (Master)
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else if ((a >= 0x100000) && (a <= 0x10FFFF))
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return SCSP_Master_r32(a);
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// SCSP (Slave)
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else if ((a >= 0x300000) && (a <= 0x30FFFF))
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return SCSP_Slave_r32(a);
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// Unknown
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else
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{
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printf("68K: Unknown read32 %06X\n", a);
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return 0;
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}
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}
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static void Write8 (unsigned int a,unsigned char d)
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{
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// SCSP RAM 1
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if ((a >= 0x000000) && (a <= 0x0FFFFF))
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sbRAM1[a^1] = d;
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// SCSP RAM 2
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else if ((a >= 0x200000) && (a <= 0x2FFFFF))
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sbRAM2[(a-0x200000)^1] = d;
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// SCSP (Master)
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else if ((a >= 0x100000) && (a <= 0x10FFFF))
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SCSP_Master_w8(a,d);
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// SCSP (Slave)
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else if ((a >= 0x300000) && (a <= 0x30FFFF))
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SCSP_Slave_w8(a,d);
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// Unknown
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else
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printf("68K: Unknown write8 %06X=%02X\n", a, d);
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}
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static void Write16(unsigned int a,unsigned short d)
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{
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// SCSP RAM 1
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if ((a >= 0x000000) && (a <= 0x0FFFFF))
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*(UINT16 *) &sbRAM1[a] = d;
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// SCSP RAM 2
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else if ((a >= 0x200000) && (a <= 0x2FFFFF))
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*(UINT16 *) &sbRAM2[(a-0x200000)] = d;
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// SCSP (Master)
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else if ((a >= 0x100000) && (a <= 0x10FFFF))
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SCSP_Master_w16(a,d);
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// SCSP (Slave)
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else if ((a >= 0x300000) && (a <= 0x30FFFF))
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SCSP_Slave_w16(a,d);
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// Unknown
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else
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printf("68K: Unknown write16 %06X=%04X\n", a, d);
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}
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static void Write32(unsigned int a,unsigned int d)
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{
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// SCSP RAM 1
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if ((a >= 0x000000) && (a <= 0x0FFFFF))
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{
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Write16(a,d>>16);
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Write16(a+2,d&0xFFFF);
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}
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// SCSP RAM 2
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else if ((a >= 0x200000) && (a <= 0x2FFFFF))
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{
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Write16(a,d>>16);
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Write16(a+2,d&0xFFFF);
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}
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// SCSP (Master)
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else if ((a >= 0x100000) && (a <= 0x10FFFF))
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SCSP_Master_w32(a,d);
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// SCSP (Slave)
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else if ((a >= 0x300000) && (a <= 0x30FFFF))
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SCSP_Slave_w32(a,d);
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// Unknown
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else
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printf("68K: Unknown write32 %06X=%08X\n", a, d);
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}
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/******************************************************************************
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SCSP 68K Callbacks
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The SCSP emulator drives the 68K via callbacks.
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******************************************************************************/
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// Status of IRQ pins (IPL2-0) on 68K
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static int irqLine = 0;
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// Interrupt acknowledge callback (TODO: don't need this, default behavior in M68K.cpp is fine)
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int IRQAck(int irqLevel)
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{
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M68KSetIRQ(0);
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irqLine = 0;
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return M68K_IRQ_AUTOVECTOR;
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}
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// SCSP callback for generating IRQs
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void SCSP68KIRQCallback(int irqLevel)
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{
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/*
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* IRQ arbitration logic: only allow higher priority IRQs to be asserted or
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* 0 to clear pending IRQ.
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*/
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if ((irqLevel>irqLine) || (0==irqLevel))
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{
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irqLine = irqLevel;
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}
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M68KSetIRQ(irqLine);
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}
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// SCSP callback for running the 68K
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int SCSP68KRunCallback(int numCycles)
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{
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return M68KRun(numCycles);
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}
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/******************************************************************************
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Sound Board Emulation
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******************************************************************************/
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void CSoundBoard::WriteMIDIPort(UINT8 data)
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{
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SCSP_MidiIn(data);
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}
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void CSoundBoard::RunFrame(void)
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{
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#ifdef SUPERMODEL_SOUND
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SCSP_Update();
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// Output to binary file
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INT16 s;
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for (int i = 0; i < 44100/60; i++)
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{
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s = ((UINT16)leftBuffer[i]>>8) | ((leftBuffer[i]&0xFF)<<8);
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fwrite(&s, sizeof(INT16), 1, soundFP); // left channel
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s = ((UINT16)rightBuffer[i]>>8) | ((rightBuffer[i]&0xFF)<<8);
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fwrite(&s, sizeof(INT16), 1, soundFP); // right channel
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}
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#endif
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}
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void CSoundBoard::Reset(void)
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{
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memcpy(ram1, soundROM, 16); // copy 68K vector table
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M68KReset();
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DebugLog("Sound Board Reset\n");
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}
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/******************************************************************************
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Configuration, Initialization, and Shutdown
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******************************************************************************/
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// Offsets of memory regions within sound board's pool
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#define OFFSETsbRAM1 0 // 1 MB SCSP1 RAM
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#define OFFSETsbRAM2 0x100000 // 1 MB SCSP2 RAM
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#define MEMORY_POOL_SIZE (0x100000+0x100000)
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BOOL CSoundBoard::Init(const UINT8 *soundROMPtr, const UINT8 *sampleROMPtr, CIRQ *ppcIRQObjectPtr, unsigned soundIRQBit)
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{
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float memSizeMB = (float)MEMORY_POOL_SIZE/(float)0x100000;
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// Attach IRQ controller
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ppcIRQ = ppcIRQObjectPtr;
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ppcSoundIRQBit = soundIRQBit;
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// Receive sound ROMs
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soundROM = soundROMPtr;
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sampleROM = sampleROMPtr;
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// Allocate all memory for RAM
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memoryPool = new(std::nothrow) UINT8[MEMORY_POOL_SIZE];
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if (NULL == memoryPool)
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return ErrorLog("Insufficient memory for sound board (needs %1.1f MB).", memSizeMB);
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memset(memoryPool, 0, MEMORY_POOL_SIZE);
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// Set up memory pointers
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ram1 = &memoryPool[OFFSETsbRAM1];
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ram2 = &memoryPool[OFFSETsbRAM2];
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// Make global copies of memory pointers for 68K access handlers
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sbRAM1 = ram1;
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sbRAM2 = ram2;
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sbSoundROM = soundROM;
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sbSampleROM = sampleROM;
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// Initialize 68K core
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M68KInit();
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M68KSetIRQCallback(IRQAck);
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M68KSetFetch8Callback(Read8);
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M68KSetFetch16Callback(Read16);
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M68KSetFetch32Callback(Read32);
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M68KSetRead8Callback(Read8);
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M68KSetRead16Callback(Read16);
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M68KSetRead32Callback(Read32);
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M68KSetWrite8Callback(Write8);
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M68KSetWrite16Callback(Write16);
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M68KSetWrite32Callback(Write32);
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// Initialize SCSPs
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SCSP_SetBuffers(leftBuffer, rightBuffer, 44100/60);
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SCSP_SetCB(SCSP68KRunCallback, SCSP68KIRQCallback, ppcIRQ, ppcSoundIRQBit);
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SCSP_Init(2);
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SCSP_SetRAM(0, ram1);
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SCSP_SetRAM(1, ram2);
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// Binary logging
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#ifdef SUPERMODEL_SOUND
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soundFP = fopen("sound.bin","wb"); // delete existing file
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fclose(soundFP);
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soundFP = fopen("sound.bin","ab"); // append mode
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#endif
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return OKAY;
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}
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CSoundBoard::CSoundBoard(void)
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{
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memoryPool = NULL;
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ram1 = NULL;
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ram2 = NULL;
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DebugLog("Built Sound Board\n");
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}
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static void Reverse16(UINT8 *buf, unsigned size)
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{
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unsigned i;
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UINT8 tmp;
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for (i = 0; i < size; i += 2)
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{
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tmp = buf[i+0];
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buf[i+0] = buf[i+1];
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buf[i+1] = tmp;
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}
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}
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CSoundBoard::~CSoundBoard(void)
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{
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#ifdef SUPERMODEL_SOUND
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// close binary log file
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fclose(soundFP);
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//#if 0
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FILE *fp;
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Reverse16(ram1, 0x100000);
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Reverse16(ram2, 0x100000);
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fp = fopen("scspRAM1", "wb");
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if (NULL != fp)
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{
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fwrite(ram1, sizeof(UINT8), 0x100000, fp);
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fclose(fp);
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printf("dumped %s\n", "scspRAM1");
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}
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fp = fopen("scspRAM2", "wb");
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if (NULL != fp)
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{
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fwrite(ram2, sizeof(UINT8), 0x100000, fp);
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fclose(fp);
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printf("dumped %s\n", "scspRAM2");
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}
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//#endif
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#endif
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SCSP_Deinit();
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if (memoryPool != NULL)
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{
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delete [] memoryPool;
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memoryPool = NULL;
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}
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ram1 = NULL;
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ram2 = NULL;
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DebugLog("Destroyed Sound Board\n");
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}
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