mirror of https://github.com/proxmox/mirror_qemu
86 lines
1.6 KiB
C
86 lines
1.6 KiB
C
/*
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* QEMU Apple Sound Chip emulation
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*
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* Apple Sound Chip (ASC) 344S0063
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* Enhanced Apple Sound Chip (EASC) 343S1063
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*
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* Copyright (c) 2012-2018 Laurent Vivier <laurent@vivier.eu>
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* Copyright (c) 2022 Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
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*
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* SPDX-License-Identifier: GPL-2.0-or-later
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*/
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#ifndef HW_AUDIO_ASC_H
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#define HW_AUDIO_ASC_H
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#include "hw/sysbus.h"
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#include "audio/audio.h"
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#define ASC_FREQ 22257
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enum {
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ASC_TYPE_ASC = 0, /* original discrete Apple Sound Chip */
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ASC_TYPE_EASC = 1 /* discrete Enhanced Apple Sound Chip */
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};
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#define ASC_FIFO_OFFSET 0x0
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#define ASC_FIFO_SIZE 0x400
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#define ASC_REG_OFFSET 0x800
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#define ASC_REG_SIZE 0x60
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#define ASC_EXTREG_OFFSET 0xf00
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#define ASC_EXTREG_SIZE 0x20
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typedef struct ASCFIFOState {
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int index;
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MemoryRegion mem_fifo;
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uint8_t fifo[ASC_FIFO_SIZE];
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uint8_t int_status;
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int cnt;
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int wptr;
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int rptr;
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MemoryRegion mem_extregs;
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uint8_t extregs[ASC_EXTREG_SIZE];
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int xa_cnt;
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uint8_t xa_val;
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uint8_t xa_flags;
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int16_t xa_last[2];
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} ASCFIFOState;
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struct ASCState {
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SysBusDevice parent_obj;
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uint8_t type;
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MemoryRegion asc;
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MemoryRegion mem_fifo;
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MemoryRegion mem_regs;
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MemoryRegion mem_extregs;
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QEMUSoundCard card;
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SWVoiceOut *voice;
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uint8_t *mixbuf;
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int samples;
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int shift;
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uint8_t *silentbuf;
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/* Time when we were last able to generate samples */
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int64_t fifo_empty_ns;
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qemu_irq irq;
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ASCFIFOState fifos[2];
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uint8_t regs[ASC_REG_SIZE];
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};
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#define TYPE_ASC "apple-sound-chip"
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OBJECT_DECLARE_SIMPLE_TYPE(ASCState, ASC)
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#endif
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