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emulator.c
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emulator.c
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/*
* Copyright (c) 2019-2024, Extrems <extrems@extremscorner.org>
*
* This file is part of Swiss.
*
* Swiss is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* Swiss is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* with Swiss. If not, see <https://www.gnu.org/licenses/>.
*/
#include <stdint.h>
#include <stddef.h>
#include <stdbool.h>
#include <string.h>
#include "audio.h"
#include "bba/bba.h"
#include "common.h"
#include "dolphin/dvd.h"
#include "dolphin/exi.h"
#include "dolphin/os.h"
#include "emulator.h"
#include "emulator_card.h"
#include "emulator_eth.h"
#include "fifo.h"
#include "frag.h"
#include "interrupt.h"
#include "PowerPC.h"
static struct {
union {
uint32_t regs[2];
struct {
uint32_t intsr;
uint32_t intmsk;
} reg;
};
} pi;
static void pi_update_interrupts(void)
{
if (pi.reg.intsr & pi.reg.intmsk)
assert_interrupt();
else
PI[0] = 1;
}
#ifdef CARD_EMULATOR
static struct {
union {
uint32_t regs[15];
struct {
uint32_t cpr;
uint32_t mar;
uint32_t length;
uint32_t cr;
uint32_t data;
} reg[3];
};
OSAlarm alarm[EXI_CHANNEL_MAX];
} exi = {
.reg = {
{ .cpr = 0b11100000000000 },
{ .cpr = 0b01100000000000 }
}
};
static void exi_update_interrupts(void)
{
if ((exi.reg[EXI_CHANNEL_0].cpr >> 1) & (exi.reg[EXI_CHANNEL_0].cpr & 0b00010000000101) ||
(exi.reg[EXI_CHANNEL_1].cpr >> 1) & (exi.reg[EXI_CHANNEL_1].cpr & 0b00010000000101) ||
(exi.reg[EXI_CHANNEL_2].cpr >> 1) & (exi.reg[EXI_CHANNEL_2].cpr & 0b00010000000101))
pi.reg.intsr |= 0b00000000010000;
else
pi.reg.intsr &= ~0b00000000010000;
pi_update_interrupts();
}
void exi_interrupt(unsigned chan)
{
exi.reg[chan].cpr |= 0b00000000000010;
exi_update_interrupts();
}
void exi_complete_transfer(unsigned chan)
{
if (exi.reg[chan].cr & 0b000010) {
exi.reg[chan].mar += exi.reg[chan].length;
exi.reg[chan].length = 0;
}
exi.reg[chan].cpr |= 0b00000000001000;
exi.reg[chan].cr &= ~0b000001;
exi_update_interrupts();
}
void exi0_complete_transfer()
{
exi_complete_transfer(EXI_CHANNEL_0);
}
void exi1_complete_transfer()
{
exi_complete_transfer(EXI_CHANNEL_1);
}
void exi2_complete_transfer()
{
exi_complete_transfer(EXI_CHANNEL_2);
}
static void exi_transfer(unsigned chan, uint32_t length)
{
OSTick ticks = ((length * (OS_TIMER_CLOCK / 843750)) * 8) >> ((exi.reg[chan].cpr >> 4) & 0b111);
OSAlarmHandler handler = NULL;
switch (chan) {
case EXI_CHANNEL_0:
handler = exi0_complete_transfer;
break;
case EXI_CHANNEL_1:
handler = exi1_complete_transfer;
break;
case EXI_CHANNEL_2:
handler = exi2_complete_transfer;
break;
}
OSSetAlarm(&exi.alarm[chan], ticks, handler);
}
void exi_insert_device(unsigned chan)
{
exi.reg[chan].cpr |= 0b01000000000000;
}
void exi_remove_device(unsigned chan)
{
exi.reg[chan].cpr &= ~0b01000000000000;
exi.reg[chan].cpr |= 0b00100000000000;
exi_update_interrupts();
}
static void exi_read(unsigned index, uint32_t *value)
{
unsigned chan = index / 5;
unsigned dev = (exi.reg[chan].cpr >> 7) & 0b111;
switch (index) {
case 0:
if (dev & ~(1 << EXI_DEVICE_0))
*value = exi.reg[chan].cpr | (EXI[chan][0] & 0b00000000001100);
else
*value = exi.reg[chan].cpr;
break;
case 1 ... 4:
if (dev & ~(1 << EXI_DEVICE_0))
*value = exi.regs[index] = (*EXI)[index];
else
*value = exi.regs[index];
break;
#ifndef USB
case 5:
if (!dev && chan != *VAR_EXI_SLOT) {
if (exi.reg[chan].cpr & 0b01000000000000) {
if (EXI[chan][0] & 0b01000000000000)
exi_remove_device(chan);
} else if (!(EXI[chan][0] & 0b01100000000000))
exi_insert_device(chan);
}
if (!(exi.reg[chan].cpr & 0b01100000000000))
*value = exi.reg[chan].cpr | EXI[chan][0];
else
*value = exi.reg[chan].cpr;
break;
case 6 ... 9:
if (!(exi.reg[chan].cpr & 0b01000000000000))
*value = exi.regs[index] = (*EXI)[index];
else
*value = exi.regs[index];
break;
#endif
case 10:
*value = exi.reg[chan].cpr | (EXI[chan][0] & 0b00000000000011);
break;
default:
*value = exi.regs[index];
}
}
static void exi_write(unsigned index, uint32_t value)
{
unsigned chan = index / 5;
unsigned dev = (exi.reg[chan].cpr >> 7) & 0b111;
unsigned dev2;
bool ext = !!(exi.reg[chan].cpr & 0b01000000000000);
switch (index % 5) {
case 0:
if (chan == EXI_CHANNEL_1) {
#ifndef USB
if (!(exi.reg[chan].cpr & 0b01100000000000))
EXI[chan][0] = value;
#endif
} else if (chan == EXI_CHANNEL_2)
EXI[chan][0] = (value & 0b00000000000011) | (EXI[chan][0] & 0b00011111110100);
exi.reg[chan].cpr = ((value & 0b00100000001010) ^ exi.reg[chan].cpr) & exi.reg[chan].cpr;
if ((value & 0b00001110000000) & ((value & 0b00001110000000) - 1))
exi.reg[chan].cpr = (value & 0b10010001110101) | (exi.reg[chan].cpr & 0b11100000001010);
else
exi.reg[chan].cpr = (value & 0b10011111110101) | (exi.reg[chan].cpr & 0b11100000001010);
dev2 = (exi.reg[chan].cpr >> 7) & 0b111;
if (chan == EXI_CHANNEL_0) {
if ((dev | dev2) & ~(1 << EXI_DEVICE_0)) {
if (*VAR_EXI_SLOT == EXI_CHANNEL_0)
end_read();
EXI[chan][0] = (value & 0b10001111111100) | (EXI[chan][0] & 0b00010000000001);
}
}
if (ext) {
if ((~dev & dev2) & (1 << EXI_DEVICE_0))
card_select(chan);
if ((dev & ~dev2) & (1 << EXI_DEVICE_0))
card_deselect(chan);
}
exi_update_interrupts();
break;
case 1 ... 2:
exi.regs[index] = value & 0x3FFFFE0;
break;
case 3:
exi.regs[index] = value & 0b111111;
if (value & 0b000001) {
#ifdef USB
if (chan == EXI_CHANNEL_0 && (dev & ~(1 << EXI_DEVICE_0))) {
#else
if ((chan == EXI_CHANNEL_0 && (dev & ~(1 << EXI_DEVICE_0))) ||
(chan == EXI_CHANNEL_1 && !ext)) {
#endif
EXI[chan][1] = exi.reg[chan].mar;
EXI[chan][2] = exi.reg[chan].length;
EXI[chan][4] = exi.reg[chan].data;
EXI[chan][3] = exi.reg[chan].cr;
} else {
if (value & 0b000010) {
uint32_t address = exi.reg[chan].mar;
uint32_t length = exi.reg[chan].length;
int type = (exi.reg[chan].cr >> 2) & 0b11;
bool async = false;
if (ext && (dev & (1 << EXI_DEVICE_0)))
async = card_dma(chan, address, length, type);
if (!async) exi_transfer(chan, length);
} else {
int length = (exi.reg[chan].cr >> 4) & 0b11;
char *data = (char *)&exi.reg[chan].data;
if (ext && (dev & (1 << EXI_DEVICE_0))) {
for (int i = 0; i <= length; i++)
data[i] = card_imm(chan, data[i]);
} else {
for (int i = 0; i <= length; i++)
data[i] = ~0;
}
exi_complete_transfer(chan);
}
}
}
break;
case 4:
exi.regs[index] = value;
break;
}
}
#elifdef ETH_EMULATOR
static struct {
union {
uint32_t regs[15];
struct {
uint32_t cpr;
uint32_t mar;
uint32_t length;
uint32_t cr;
uint32_t data;
} reg[3];
};
} exi;
static void exi_update_interrupts(void)
{
if ((exi.reg[EXI_CHANNEL_0].cpr >> 1) & (exi.reg[EXI_CHANNEL_0].cpr & 0b00010000000101) ||
(exi.reg[EXI_CHANNEL_1].cpr >> 1) & (exi.reg[EXI_CHANNEL_1].cpr & 0b00010000000101) ||
(exi.reg[EXI_CHANNEL_2].cpr >> 1) & (exi.reg[EXI_CHANNEL_2].cpr & 0b00010000000101))
pi.reg.intsr |= 0b00000000010000;
else
pi.reg.intsr &= ~0b00000000010000;
pi_update_interrupts();
}
void exi_interrupt(unsigned chan)
{
exi.reg[chan].cpr |= 0b00000000000010;
exi_update_interrupts();
}
void exi_complete_transfer(unsigned chan)
{
if (exi.reg[chan].cr & 0b000010) {
exi.reg[chan].mar += exi.reg[chan].length;
exi.reg[chan].length = 0;
}
exi.reg[chan].cpr |= 0b00000000001000;
exi.reg[chan].cr &= ~0b000001;
exi_update_interrupts();
}
static void exi_read(unsigned index, uint32_t *value)
{
unsigned chan = index / 5;
unsigned dev = (exi.reg[chan].cpr >> 7) & 0b111;
uint32_t mask = exi_get_interrupt_mask(chan);
uint32_t mask2 = (((mask << 1) & 0b00000000010000) * 0b111111) | (mask >> 1);
mask |= mask2;
switch (index % 5) {
case 0:
if (chan == EXI_CHANNEL_2)
mask |= 0b00000000000011;
if (chan == EXI_CHANNEL_0 && (dev & (1 << EXI_DEVICE_2)))
mask |= 0b00001111111100;
if (chan == *VAR_EXI_SLOT)
mask |= 0b01000000000000;
*value = exi.reg[chan].cpr | (EXI[chan][0] & ~mask);
break;
case 1 ... 4:
if (chan == EXI_CHANNEL_0 && (dev & (1 << EXI_DEVICE_2)))
*value = exi.regs[index];
else
*value = exi.regs[index] = (*EXI)[index];
break;
}
}
static void exi_write(unsigned index, uint32_t value)
{
unsigned chan = index / 5;
unsigned dev = (exi.reg[chan].cpr >> 7) & 0b111;
unsigned dev2;
uint32_t mask = exi_get_interrupt_mask(chan);
uint32_t mask2 = (((mask << 1) & 0b00000000010000) * 0b111111) | (mask >> 1);
mask |= mask2;
switch (index % 5) {
case 0:
exi.reg[chan].cpr = ((value & 0b00100000001010) ^ exi.reg[chan].cpr) & exi.reg[chan].cpr;
if ((value & 0b00001110000000) & ((value & 0b00001110000000) - 1))
exi.reg[chan].cpr = (value & 0b10010001110101) | (exi.reg[chan].cpr & 0b11100000001010);
else
exi.reg[chan].cpr = (value & 0b10011111110101) | (exi.reg[chan].cpr & 0b11100000001010);
dev2 = (exi.reg[chan].cpr >> 7) & 0b111;
if (chan == EXI_CHANNEL_2)
mask |= 0b00000000000011;
if (chan == EXI_CHANNEL_0 && ((dev | dev2) & (1 << EXI_DEVICE_2))) {
mask |= 0b00001111111100;
} else if (chan == *VAR_EXI_SLOT) {
if ((dev | dev2) & (1 << EXI_DEVICE_0))
mask |= 0b00001110000000;
if (~dev & dev2)
end_read();
}
EXI[chan][0] = (value & ~mask) | (EXI[chan][0] & mask2);
if (chan == EXI_CHANNEL_0) {
if ((~dev & dev2) & (1 << EXI_DEVICE_2))
eth_exi_select();
if ((dev & ~dev2) & (1 << EXI_DEVICE_2))
eth_exi_deselect();
}
exi_update_interrupts();
break;
case 1 ... 2:
exi.regs[index] = value & 0x3FFFFE0;
break;
case 3:
exi.regs[index] = value & 0b111111;
if (value & 0b000001) {
if (chan == EXI_CHANNEL_0 && (dev & (1 << EXI_DEVICE_2))) {
if (value & 0b000010) {
uint32_t address = exi.reg[chan].mar;
uint32_t length = exi.reg[chan].length;
int type = (exi.reg[chan].cr >> 2) & 0b11;
eth_exi_dma(address, length, type);
exi_complete_transfer(chan);
} else {
int length = (exi.reg[chan].cr >> 4) & 0b11;
char *data = (char *)&exi.reg[chan].data;
for (int i = 0; i <= length; i++)
data[i] = eth_exi_imm(data[i]);
exi_complete_transfer(chan);
}
} else {
EXI[chan][1] = exi.reg[chan].mar;
EXI[chan][2] = exi.reg[chan].length;
EXI[chan][4] = exi.reg[chan].data;
EXI[chan][3] = exi.reg[chan].cr;
}
}
break;
case 4:
exi.regs[index] = value;
break;
}
}
#else
static void exi_read(unsigned index, uint32_t *value)
{
unsigned chan = index / 5;
uint32_t mask = exi_get_interrupt_mask(chan);
uint32_t mask2 = (((mask << 1) & 0b00000000010000) * 0b111111) | (mask >> 1);
mask |= mask2;
switch (index % 5) {
case 0:
if (chan == *VAR_EXI_SLOT)
mask |= 0b01000000000000;
#ifdef USB
if (chan == EXI_CHANNEL_1)
mask |= 0b01000000000000;
#endif
*value = EXI[chan][0] & ~mask;
break;
default:
*value = (*EXI)[index];
}
}
static void exi_write(unsigned index, uint32_t value)
{
unsigned chan = index / 5;
unsigned dev = (EXI[chan][0] >> 7) & 0b111;
unsigned dev2;
uint32_t mask = exi_get_interrupt_mask(chan);
uint32_t mask2 = (((mask << 1) & 0b00000000010000) * 0b111111) | (mask >> 1);
mask |= mask2;
switch (index % 5) {
case 0:
dev2 = (value >> 7) & 0b111;
if (~dev & dev2) {
if (chan == *VAR_EXI_SLOT) {
if (dev2 & (1 << EXI_DEVICE_0))
mask |= 0b00001110000000;
end_read();
}
#ifdef BBA
if (chan == EXI_CHANNEL_0 && (dev2 & (1 << EXI_DEVICE_2)))
mask |= 0b00001110000000;
#endif
#ifdef USB
if (chan == EXI_CHANNEL_1 && (dev2 & (1 << EXI_DEVICE_0)))
mask |= 0b00001110000000;
#endif
}
EXI[chan][0] = (value & ~mask) | (EXI[chan][0] & mask2);
break;
default:
(*EXI)[index] = value;
}
}
#endif
static struct {
#ifdef DTK
adpcm_t adpcm;
fifo_t fifo;
uint8_t (*buffer)[512];
#endif
bool reading;
bool flushing;
bool playing;
bool stopping;
struct {
uint32_t position;
uint32_t start;
uint32_t length;
} current;
struct {
uint32_t start;
uint32_t length;
} next;
} dtk;
#ifdef DTK
static void dtk_decode_buffer(void *address, uint32_t length)
{
adpcm_decode(&dtk.adpcm, &dtk.fifo, *dtk.buffer, 448);
dtk.current.position += sizeof(*dtk.buffer);
if (dtk.current.position == dtk.current.start + dtk.current.length) {
dtk.current.position =
dtk.current.start = dtk.next.start;
dtk.current.length = dtk.next.length;
if (dtk.stopping) {
dtk.stopping = false;
dtk.playing = false;
}
adpcm_reset(&dtk.adpcm);
}
}
bool dtk_fill_buffer(void)
{
if (dtk.reading)
return true;
if (!dtk.playing)
return false;
if (fifo_space(&dtk.fifo) < 448 * sizeof(sample_t))
return false;
#ifdef ASYNC_READ
void read_callback(void *address, uint32_t length)
{
dtk.reading = false;
if (dtk.flushing) dtk.flushing = false;
else dtk_decode_buffer(address, length);
dtk_fill_buffer();
}
DCInvalidateRange(__builtin_assume_aligned(dtk.buffer, 32), sizeof(*dtk.buffer));
return dtk.reading = frag_read_async(*VAR_CURRENT_DISC, dtk.buffer, sizeof(*dtk.buffer), dtk.current.position, read_callback);
#else
OSCancelAlarm(&read_alarm);
OSTick start = OSGetTick();
int size = frag_read(*VAR_CURRENT_DISC, dtk.buffer, sizeof(*dtk.buffer), dtk.current.position);
if (size == sizeof(*dtk.buffer))
dtk_decode_buffer(dtk.buffer, size);
OSTick end = OSGetTick();
OSSetAlarm(&read_alarm, OSDiffTick(end, start), trickle_read);
return true;
#endif
}
#endif
static struct {
union {
uint32_t regs[9];
struct {
uint32_t sr;
uint32_t cvr;
uint32_t cmdbuf0;
uint32_t cmdbuf1;
uint32_t cmdbuf2;
uint32_t mar;
uint32_t length;
uint32_t cr;
uint32_t immbuf;
} reg;
};
uint32_t status : 8;
uint32_t error : 24;
#ifdef DVD
int reset;
#endif
} di;
static void di_update_interrupts(void)
{
if ((di.reg.sr >> 1) & (di.reg.sr & 0b0101010) ||
(di.reg.cvr >> 1) & (di.reg.cvr & 0b010))
pi.reg.intsr |= 0b00000000000100;
else
pi.reg.intsr &= ~0b00000000000100;
pi_update_interrupts();
}
void di_error(uint32_t error)
{
di.reg.sr |= 0b0000100;
di.reg.cr &= ~0b001;
di.error = error;
di_update_interrupts();
}
void di_complete_transfer()
{
if (di.reg.cr & 0b010) {
di.reg.mar += di.reg.length;
di.reg.length = 0;
}
di.reg.sr |= 0b0010000;
di.reg.cr &= ~0b001;
di_update_interrupts();
}
void di_open_cover(void)
{
di.reg.cvr |= 0b001;
di.status = 1;
}
void di_close_cover()
{
di.reg.cvr &= ~0b001;
di.reg.cvr |= 0b100;
di.status = 0;
di_update_interrupts();
}
OSAlarm di_alarm;
OSAlarm cover_alarm;
OSAlarm read_alarm;
#ifndef DI_PASSTHROUGH
#ifdef GCODE
bool gcode_push_queue(void *buffer, uint32_t length, uint32_t offset, uint64_t sector, uint32_t command, frag_callback callback);
#endif
static void di_execute_command()
{
uint32_t result = 0;
switch (di.reg.cmdbuf0 >> 24) {
case DI_CMD_READ:
{
uint32_t address = di.reg.mar;
uint32_t length = di.reg.length;
uint32_t offset = di.reg.cmdbuf1 << 2;
if (di.status == 1)
di_error(0x023A00);
else if (!length)
di_error(0x052400);
else
perform_read(address, length, offset);
return;
}
case DI_CMD_SEEK:
{
uint32_t offset = di.reg.cmdbuf1 << 2;
if (di.status == 1)
di_error(0x023A00);
else
perform_read(0, 0, offset);
return;
}
case DI_CMD_REQUEST_ERROR:
{
result = di.error | di.status << 24;
di.error = 0;
break;
}
#if defined GCODE && !defined DTK
case DI_CMD_AUDIO_STREAM:
case DI_CMD_REQUEST_AUDIO_STATUS:
{
gcode_push_queue(&di.reg.immbuf, di.reg.cmdbuf2, di.reg.cmdbuf1, 0, di.reg.cmdbuf0, di_complete_transfer);
return;
}
#else
case DI_CMD_AUDIO_STREAM:
{
switch ((di.reg.cmdbuf0 >> 16) & 0x03) {
case 0x00:
{
uint32_t offset = DVDRoundDown32KB(di.reg.cmdbuf1 << 2);
uint32_t length = DVDRoundDown32KB(di.reg.cmdbuf2);
if (!length) {
dtk.stopping = true;
} else if (!dtk.stopping) {
dtk.next.start = offset;
dtk.next.length = length;
if (!dtk.playing) {
dtk.current.position =
dtk.current.start = offset;
dtk.current.length = length;
dtk.playing = true;
#ifdef DTK
dtk_fill_buffer();
#endif
}
}
break;
}
case 0x01:
{
dtk.stopping = false;
dtk.playing = false;
#ifdef DTK
dtk.flushing = dtk.reading;
adpcm_reset(&dtk.adpcm);
fifo_reset(&dtk.fifo);
#endif
break;
}
}
break;
}
case DI_CMD_REQUEST_AUDIO_STATUS:
{
switch ((di.reg.cmdbuf0 >> 16) & 0x03) {
#ifndef DTK
case 0x00: result = dtk.playing; break;
#else
case 0x00: result = dtk.playing | !!fifo_size(&dtk.fifo); break;
#endif
case 0x01: result = DVDRoundDown32KB(dtk.current.position) >> 2; break;
case 0x02: result = DVDRoundDown32KB(dtk.current.start) >> 2; break;
case 0x03: result = dtk.current.length; break;
}
break;
}
#endif
case DI_CMD_STOP_MOTOR:
{
if (di.status == 0 && change_disc()) {
di_open_cover();
#ifndef GCODE
OSSetAlarm(&cover_alarm, OSSecondsToTicks(1.5), di_close_cover);
#endif
}
break;
}
}
di.reg.immbuf = result;
di_complete_transfer();
}
#else
static void di_execute_command()
{
#ifdef DVD
if (di.reset)
return;
#endif
switch (di.reg.cmdbuf0 >> 24) {
case DI_CMD_READ:
{
uint32_t address = di.reg.mar;
uint32_t length = di.reg.length;
uint32_t offset = di.reg.cmdbuf1 << 2;
#ifdef GCODE
if (!length) {
di_error(0x052400);
return;
}
#endif
if ((di.reg.cmdbuf0 & 0xC0) != 0x40) {
perform_read(address, length, offset);
return;
}
break;
}
}
DI[2] = di.reg.cmdbuf0;
DI[3] = di.reg.cmdbuf1;
DI[4] = di.reg.cmdbuf2;
DI[5] = di.reg.mar;
DI[6] = di.reg.length;
DI[8] = di.reg.immbuf;
DI[7] = di.reg.cr;
}
#endif
static void di_read(unsigned index, uint32_t *value)
{
#ifndef DI_PASSTHROUGH
*value = di.regs[index];
#else
switch (index) {
case 0 ... 1:
*value = di.regs[index] | (DI[index] & 1);
break;
case 2 ... 4:
case 7 ... 8:
*value = di.regs[index];
break;
case 5 ... 6:
if ((DI[7] & 0b011) == 0b011)
*value = di.regs[index] = DI[index];
else
*value = di.regs[index];
break;
default:
*value = DI[index];
}
#endif
}
static void di_write(unsigned index, uint32_t value)
{
switch (index) {
case 0:
di.reg.sr = ((value & 0b1010100) ^ di.reg.sr) & di.reg.sr;
di.reg.sr = (value & 0b0101011) | (di.reg.sr & 0b1010101);
di_update_interrupts();
break;
case 1:
di.reg.cvr = ((value & 0b100) ^ di.reg.cvr) & di.reg.cvr;
di.reg.cvr = (value & 0b010) | (di.reg.cvr & ~0b010);
di_update_interrupts();
break;
case 2 ... 4:
case 8:
di.regs[index] = value;
break;
case 5 ... 6:
di.regs[index] = value & 0x3FFFFE0;
break;
case 7:
di.regs[index] = value & 0b111;
if (value & 0b001) {
#ifdef DVD
di_execute_command();
#else
OSSetAlarm(&di_alarm, COMMAND_LATENCY_TICKS, di_execute_command);
#endif
}
break;
}
}
#ifdef DTK
static struct {
union {
uint16_t regs[4];
struct {
uint32_t aima;
uint32_t aibl;
} reg;
};
struct {
int aima;
} req;
uint8_t (*buffer[2])[640];
} dsp;
static void dsp_read(unsigned index, uint32_t *value)
{
switch (index) {
case 24:
case 25:
*value = ((uint16_t *)DSP)[index];
dsp.req.aima--;
break;
default:
*value = ((uint16_t *)DSP)[index];
}
}
static void dsp_write(unsigned index, uint16_t value)
{
switch (index) {
case 24:
dsp.regs[index - 24] = value & 0x3FF;
dsp.req.aima++;
break;
case 25:
dsp.regs[index - 24] = value & 0xFFE0;
dsp.req.aima++;
break;
case 27:
dsp.regs[index - 24] = value;
if ((value & 0x8000) && dsp.req.aima >= 0) {
void *in = OSPhysicalToUncached(dsp.reg.aima);
int length = (dsp.reg.aibl & 0x7FFF) << 5;
int count = length / sizeof(sample_t);
void *out = in;
if (length <= sizeof(**dsp.buffer)) {
out = dsp.buffer[0];
dsp.buffer[0] = dsp.buffer[1];
dsp.buffer[1] = out;
}
uint32_t aicr = AI[0];
uint32_t aivr = AI[1];
if (aicr & 0b0000001) mix_samples(out, in, &dtk.fifo, count, aicr & 0b1000000, aivr, aivr >> 8);
else if (out != in) out = memcpy(out, in, length);
DSP[12] = (intptr_t)out;
DSP[13] = ((length >> 5) & 0x7FFF) | 0x8000;
dtk_fill_buffer();
} else {
DSP[12] = dsp.reg.aima;
DSP[13] = dsp.reg.aibl;
}
dsp.req.aima = 0;
break;
}
}
#endif
#ifdef DVD
static void di_reset(void)
{
uint32_t disr = DI[0];
uint32_t dicvr = DI[1];
DI[0] = disr & 0b1111110;
DI[1] = dicvr & 0b110;
if (di.reset > 0 && !(disr & 0b0010100)) return;
if (di.reset > 3 && (disr & 0b0000100))
di.reset = 3;
switch (di.reset++) {
case 0:
DI[2] = 0xFF014D41;
DI[3] = 0x54534849;
DI[4] = 0x54410200;
DI[7] = 0b001;
break;
case 1:
DI[2] = 0xFF004456;
DI[3] = 0x442D4741;
DI[4] = 0x4D450300;
DI[7] = 0b001;
break;
case 2:
DI[2] = 0x55010000;
DI[3] = 0;
DI[4] = 0;
DI[7] = 0b001;
break;
case 3:
DI[2] = 0xFE114100;
DI[3] = 0;
DI[4] = 0;
DI[7] = 0b001;
break;
case 4: