mirror of
https://github.com/dingusdev/dingusppc.git
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105 lines
3.1 KiB
C++
105 lines
3.1 KiB
C++
/*
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DingusPPC - The Experimental PowerPC Macintosh emulator
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Copyright (C) 2018-21 divingkatae and maximum
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(theweirdo) spatium
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(Contact divingkatae#1017 or powermax#2286 on Discord for more info)
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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 3 of the License, or
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(at your option) any later version.
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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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You should have received a copy of the GNU General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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/** @file Sander-Wozniak Machine 3 (SWIM3) emulation. */
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#include "superdrive.h"
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#include "swim3.h"
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#include <loguru.hpp>
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#include <cinttypes>
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#include <memory>
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using namespace Swim3;
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Swim3Ctrl::Swim3Ctrl()
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{
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this->setup_reg = 0;
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this->mode_reg = 0;
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this->int_reg = 0;
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this->int_mask = 0;
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this->xfer_cnt = 0;
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this->first_sec = 0xFF;
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// Attach virtual Superdrive to the internal drive connector
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// TODO: make SWIM3/drive wiring user selectable
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this->int_drive = std::unique_ptr<MacSuperdrive::MacSuperDrive>
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(new MacSuperdrive::MacSuperDrive());
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}
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uint8_t Swim3Ctrl::read(uint8_t reg_offset)
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{
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uint8_t status_addr;
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switch(reg_offset) {
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case Swim3Reg::Phase:
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return this->phase_lines;
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case Swim3Reg::Setup:
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return this->setup_reg;
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case Swim3Reg::Handshake_Mode1:
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if (this->mode_reg & 2) { // internal drive?
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status_addr = ((this->mode_reg & 0x20) >> 2) | (this->phase_lines & 7);
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return ((this->int_drive->status(status_addr) & 1) << 2);
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} else {
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return 4;
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}
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default:
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LOG_F(INFO, "SWIM3: reading from 0x%X register", reg_offset);
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}
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return 0;
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}
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void Swim3Ctrl::write(uint8_t reg_offset, uint8_t value)
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{
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switch(reg_offset) {
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case Swim3Reg::Param_Data:
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this->pram = value;
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break;
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case Swim3Reg::Phase:
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this->phase_lines = value & 0xF;
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if (value & 8) {
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if (this->mode_reg & 2) { // internal drive?
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this->int_drive->command(
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((this->mode_reg & 0x20) >> 3) | (this->phase_lines & 3),
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(value >> 2) & 1
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);
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}
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}
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break;
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case Swim3Reg::Setup:
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this->setup_reg = value;
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break;
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case Swim3Reg::Status_Mode0:
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// ones in value clear the corresponding bits in the mode register
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this->mode_reg &= ~value;
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break;
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case Swim3Reg::Handshake_Mode1:
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// ones in value set the corresponding bits in the mode register
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this->mode_reg |= value;
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break;
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case Swim3Reg::Interrupt_Mask:
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this->int_mask = value;
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break;
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default:
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LOG_F(INFO, "SWIM3: writing 0x%X to register 0x%X", value, reg_offset);
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}
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}
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