318 lines
13 KiB
C++
318 lines
13 KiB
C++
/////////////////////////////////////////////////////////////////////////
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// $Id$
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/////////////////////////////////////////////////////////////////////////
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//
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// Copyright (C) 2001-2015 The Bochs Project
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//
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// This library is free software; you can redistribute it and/or
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// modify it under the terms of the GNU Lesser General Public
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// License as published by the Free Software Foundation; either
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// version 2 of the License, or (at your option) any later version.
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//
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// This library 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 GNU
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// Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public
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// License along with this library; if not, write to the Free Software
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// Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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// The original version of the SB16 support written and donated by Josef Drexler
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#ifndef BX_IODEV_SB16_H
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#define BX_IODEV_SB16_H
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#if BX_USE_SB16_SMF
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# define BX_SB16_SMF static
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# define BX_SB16_THIS theSB16Device->
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# define BX_SB16_THISP (theSB16Device)
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#else
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# define BX_SB16_SMF
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# define BX_SB16_THIS this->
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# define BX_SB16_THISP (this)
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#endif
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// If the buffer commands are to be inlined:
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#define BX_SB16_BUFINL BX_CPP_INLINE
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// BX_CPP_INLINE is defined to the inline keyword for the C++ compiler.
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// maximum number of MIDI remaps
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#define BX_SB16_MAX_REMAPS 256
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// the resources. Of these, IRQ and DMA's can be changed via a DSP command
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#define BX_SB16_IO 0x220 // IO base address of DSP, mixer & FM part
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#define BX_SB16_IOLEN 16 // number of addresses covered
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#define BX_SB16_IOMPU 0x330 // IO base address of MPU402 part
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#define BX_SB16_IOMPULEN 4 // number of addresses covered
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#define BX_SB16_IOADLIB 0x388 // equivalent to 0x220..0x223 and 0x228..0x229
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#define BX_SB16_IOADLIBLEN 4 // number of addresses covered
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#define BX_SB16_IRQ theSB16Device->currentirq
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#define BX_SB16_IRQMPU BX_SB16_IRQ // IRQ for the MPU401 part - same value
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#define BX_SB16_DMAL theSB16Device->currentdma8
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#define BX_SB16_DMAH theSB16Device->currentdma16
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/*
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A few notes:
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IRQ, DMA8bit and DMA16bit are for the DSP part. These
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are changeable at runtime in mixer registers 0x80 and 0x81.
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The defaults after a mixer initialization are IRQ 5, DMA8 1, no DMA16
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Any of the address lengths can be zero to disable that particular
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subdevice. Turning off the DSP still leaves FM music enabled on the
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BX_SB16_IOADLIB ports, unless those are disabled as well.
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BX_SB16_IOMPULEN should be 4 or 2. In the latter case, the emulator
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is completely invisible, and runtime changes are not possible
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BX_SB16_IOADLIBLEN should be 2 or 4. If 0, Ports 0x388.. don't
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get used, but the OPL2 can still be accessed at 0x228..0x229.
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If 2, the usual Adlib emulation is enabled. If 4, an OPL3 is
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emulated at adresses 0x388..0x38b, or two separate OPL2's.
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*/
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#define BX_SB16_MIX_REG 0x100 // total number of mixer registers
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// The array containing an instrument/bank remapping
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struct bx_sb16_ins_map {
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Bit8u oldbankmsb, oldbanklsb, oldprogch;
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Bit8u newbankmsb, newbanklsb, newprogch;
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};
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// This is the class for the input and
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// output FIFO buffers of the SB16
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class bx_sb16_buffer {
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public:
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BX_SB16_BUFINL bx_sb16_buffer(void);
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BX_SB16_BUFINL ~bx_sb16_buffer();
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BX_SB16_BUFINL void init(int bufferlen);
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BX_SB16_BUFINL void reset();
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/* These functions return 1 on success and 0 on error */
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BX_SB16_BUFINL bx_bool put(Bit8u data); // write one byte in the buffer
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BX_SB16_BUFINL bx_bool puts(const char *data, ...); // write a formatted string to the buffer
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BX_SB16_BUFINL bx_bool get(Bit8u *data); // read the next available byte
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BX_SB16_BUFINL bx_bool getw(Bit16u *data); // get word, in order lo/hi
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BX_SB16_BUFINL bx_bool getw1(Bit16u *data);// get word, in order hi/lo
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BX_SB16_BUFINL bx_bool full(void); // is the buffer full?
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BX_SB16_BUFINL bx_bool empty(void); // is it empty?
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BX_SB16_BUFINL void flush(void); // empty the buffer
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BX_SB16_BUFINL int bytes(void); // return number of bytes in the buffer
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BX_SB16_BUFINL Bit8u peek(int ahead); // peek ahead number of bytes
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/* These are for caching the command number */
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BX_SB16_BUFINL void newcommand(Bit8u newcmd, int bytes); // start a new command with length bytes
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BX_SB16_BUFINL Bit8u currentcommand(void); // return the current command
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BX_SB16_BUFINL void clearcommand(void); // clear the command
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BX_SB16_BUFINL bx_bool commanddone(void); // return if all bytes have arrived
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BX_SB16_BUFINL bx_bool hascommand(void); // return if there is a pending command
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BX_SB16_BUFINL int commandbytes(void); // return the length of the command
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private:
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Bit8u *buffer;
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int head,tail,length;
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Bit8u command;
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bx_bool havecommand;
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int bytesneeded;
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};
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// forward definition
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class bx_sound_lowlevel_c;
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// The actual emulator class, emulating the sound blaster ports
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class bx_sb16_c : public bx_devmodel_c {
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public:
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bx_sb16_c();
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virtual ~bx_sb16_c();
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virtual void init(void);
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virtual void reset(unsigned type);
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virtual void register_state(void);
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virtual void after_restore_state(void);
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/* Make writelog available to output functions */
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BX_SB16_SMF void writelog(int loglev, const char *str, ...);
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// runtime options
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static Bit64s sb16_param_handler(bx_param_c *param, int set, Bit64s val);
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static const char* sb16_param_string_handler(bx_param_string_c *param, int set,
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const char *oldval, const char *val,
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int maxlen);
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static void runtime_config_handler(void *);
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void runtime_config(void);
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BX_SB16_SMF Bit32u fmopl_generator(Bit16u rate, Bit8u *buffer, Bit32u len);
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private:
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int midimode, wavemode, loglevel;
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Bit8u midi_changed, wave_changed;
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Bit32u dmatimer;
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FILE *logfile;
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bx_soundlow_waveout_c *waveout[2]; // waveout support
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bx_soundlow_wavein_c *wavein; // wavein support
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bx_soundlow_midiout_c *midiout[2]; // midiout support
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int currentirq;
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int currentdma8;
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int currentdma16;
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int fmopl_callback_id;
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int rt_conf_id;
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Bit16u fm_volume;
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// the MPU 401 relevant variables
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struct bx_sb16_mpu_struct {
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bx_sb16_buffer datain, dataout, cmd, midicmd;
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bx_bool uartmode, irqpending, forceuartmode, singlecommand;
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int banklsb[16];
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int bankmsb[16]; // current patch lists
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int program[16];
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int timer_handle, current_timer; // no. of delta times passed
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Bit32u last_delta_time; // timer value at last command
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Bit8u outputinit;
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} mpu401;
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// the DSP variables
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struct bx_sb16_dsp_struct {
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bx_sb16_buffer datain, dataout;
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Bit8u resetport; // last value written to the reset port
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Bit8u speaker,prostereo; // properties of the sound input/output
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bx_bool irqpending; // Is an IRQ pending (not ack'd)
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bx_bool midiuartmode; // Is the DSP in MIDI UART mode
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Bit8u testreg;
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struct bx_sb16_dsp_dma_struct {
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// Properties of the current DMA transfer:
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// mode= 0: no transfer, 1: single-cycle transfer, 2: auto-init DMA
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// bits= 8 or 16
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// fifo= ?? Bit used in DMA command, no idea what it means...
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// output= 0: input, 1: output
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// bps= bytes per sample; =(dmabits/8)*(dmastereo+1)
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// stereo= 0: mono, 1: stereo
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// issigned= 0: unsigned data, 1: signed data
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// highspeed= 0: normal mode, 1: highspeed mode (only SBPro)
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// timer= so many us between data bytes
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int mode, bps, timer;
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bx_bool fifo, output, highspeed;
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bx_pcm_param_t param;
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Bit16u count; // bytes remaining in this transfer
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Bit8u *chunk; // buffers up to BX_SOUNDLOW_WAVEPACKETSIZE bytes
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int chunkindex; // index into the buffer
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int chunkcount; // for input: size of the recorded input
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Bit16u timeconstant;
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Bit16u blocklength;
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} dma;
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int timer_handle; // handle for the DMA timer
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Bit8u outputinit; // have the lowlevel output been initialized
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bx_bool inputinit; // have the lowlevel input been initialized
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} dsp;
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// the ASP/CSP registers
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Bit8u csp_reg[256];
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// the variables common to all FM emulations
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struct bx_sb16_opl_struct;
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friend struct bx_sb16_opl_struct;
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struct bx_sb16_opl_struct {
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int timer_handle;
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int timer_running;
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int index[2]; // index register for the two chips
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Bit16u timer[4]; // two timers on each chip
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Bit16u timerinit[4]; // initial timer counts
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int tmask[2]; // the timer masking byte for both chips
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int tflag[2]; // shows if the timer overflow has occured
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} opl;
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struct bx_sb16_mixer_struct {
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Bit8u regindex;
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Bit8u reg[BX_SB16_MIX_REG];
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} mixer;
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struct bx_sb16_emul_struct {
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bx_sb16_buffer datain, dataout;
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bx_sb16_ins_map remaplist[BX_SB16_MAX_REMAPS];
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Bit16u remaps;
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} emuldata;
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/* DMA input and output, 8 and 16 bit */
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BX_SB16_SMF Bit16u dma_write8(Bit8u *buffer, Bit16u maxlen);
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BX_SB16_SMF Bit16u dma_read8(Bit8u *buffer, Bit16u maxlen);
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BX_SB16_SMF Bit16u dma_write16(Bit16u *buffer, Bit16u maxlen);
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BX_SB16_SMF Bit16u dma_read16(Bit16u *buffer, Bit16u maxlen);
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/* the MPU 401 part of the emulator */
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BX_SB16_SMF Bit32u mpu_status(); // read status port 3x1
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BX_SB16_SMF void mpu_command(Bit32u value); // write command port 3x1
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BX_SB16_SMF Bit32u mpu_dataread(); // read data port 3x0
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BX_SB16_SMF void mpu_datawrite(Bit32u value); // write data port 3x0
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BX_SB16_SMF void mpu_mididata(Bit32u value); // get a midi byte
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static void mpu_timer (void *);
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/* The DSP part */
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BX_SB16_SMF void dsp_reset(Bit32u value); // write to reset port 2x6
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BX_SB16_SMF Bit32u dsp_dataread(); // read from data port 2xa
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BX_SB16_SMF void dsp_datawrite(Bit32u value); // write to data port 2xa
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BX_SB16_SMF Bit32u dsp_bufferstatus(); // read buffer status 2xc
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BX_SB16_SMF Bit32u dsp_status(); // read dsp status 2xe
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BX_SB16_SMF void dsp_getsamplebyte(Bit8u value);
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BX_SB16_SMF Bit8u dsp_putsamplebyte();
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BX_SB16_SMF void dsp_sendwavepacket();
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BX_SB16_SMF Bit32u dsp_irq16ack(); // ack 16 bit IRQ 2xf
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BX_SB16_SMF void dsp_dma(Bit8u command, Bit8u mode, Bit16u length, Bit8u comp);
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// initiate a DMA transfer
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BX_SB16_SMF void dsp_dmadone(); // stop a DMA transfer
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BX_SB16_SMF void dsp_enabledma(); // enable the transfer
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BX_SB16_SMF void dsp_disabledma(); // temporarily disable DMA
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static void dsp_dmatimer(void *);
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static Bit32u sb16_adc_handler(void *, Bit32u len);
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Bit32u dsp_adc_handler(Bit32u len);
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/* The mixer part */
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BX_SB16_SMF Bit32u mixer_readdata(void);
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BX_SB16_SMF void mixer_writedata(Bit32u value);
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BX_SB16_SMF void mixer_writeregister(Bit32u value);
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BX_SB16_SMF Bit16u calc_output_volume(Bit8u reg1, Bit8u reg2, bx_bool shift);
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BX_SB16_SMF void set_irq_dma();
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/* The emulator ports to change emulator properties */
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BX_SB16_SMF Bit32u emul_read (void); // read emulator port
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BX_SB16_SMF void emul_write(Bit32u value); // write emulator port
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/* The FM emulation part */
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BX_SB16_SMF Bit32u opl_status(int chipid);
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BX_SB16_SMF void opl_data(Bit32u value, int chipid);
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BX_SB16_SMF void opl_settimermask(int value, int chipid);
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static void opl_timer(void *);
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BX_SB16_SMF void opl_timerevent(void);
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/* several high level sound handlers */
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BX_SB16_SMF int currentdeltatime();
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BX_SB16_SMF void processmidicommand(bx_bool force);
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BX_SB16_SMF void midiremapprogram(int channel); // remap program change
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BX_SB16_SMF void writemidicommand(int command, int length, Bit8u data[]);
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BX_SB16_SMF void closemidioutput(); // close midi file / device
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BX_SB16_SMF void closewaveoutput(); // close wave file
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BX_SB16_SMF void create_logfile();
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/* The port IO multiplexer functions */
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static Bit32u read_handler(void *this_ptr, Bit32u address, unsigned io_len);
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static void write_handler(void *this_ptr, Bit32u address, Bit32u value, unsigned io_len);
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#if !BX_USE_SB16_SMF
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Bit32u read(Bit32u address, unsigned io_len);
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void write(Bit32u address, Bit32u value, unsigned io_len);
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#endif
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};
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#define BOTHLOG(x) (x)
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#define WRITELOG (BX_SB16_THIS writelog)
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#define MIDILOG(x) ((BX_SB16_THIS midimode>0?x:0x7f))
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#define WAVELOG(x) ((BX_SB16_THIS wavemode>0?x:0x7f))
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#endif
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