136 lines
4.1 KiB
C++
136 lines
4.1 KiB
C++
/*
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DingusPPC - The Experimental PowerPC Macintosh emulator
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Copyright (C) 2018-23 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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#ifndef MACHINE_ID_H
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#define MACHINE_ID_H
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#include <devices/common/hwcomponent.h>
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#include <devices/common/mmiodevice.h>
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#include <devices/ioctrl/macio.h>
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#include <cinttypes>
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#include <loguru.hpp>
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#include <string>
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/**
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@file Contains definitions for Power Macintosh machine ID registers.
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The machine ID register is a memory-based register containing hardcoded
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values the system software can read to identify machine/board it's running on.
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Register location and value meaning are board-dependent.
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*/
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/**
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Machine ID register for Nubus Power Macs.
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It's located at physical address 0x5FFFFFFC and contains four bytes:
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+0 uint16_t signature = 0xA55A
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+1 uint8_t machine_type (3 - Power Mac)
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+2 uint8_t model (0x10 = PDM, 0x12 = Carl Sagan, 0x13 = Cold Fusion)
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*/
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class NubusMacID : public MMIODevice {
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public:
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NubusMacID(const uint16_t id) {
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this->name = "Nubus-Machine-id";
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this->id[0] = 0xA5;
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this->id[1] = 0x5A;
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this->id[2] = (id >> 8) & 0xFF;
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this->id[3] = id & 0xFF;
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supports_types(HWCompType::MMIO_DEV);
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};
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~NubusMacID() = default;
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uint32_t read(uint32_t rgn_start, uint32_t offset, int size) {
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if (size == 4 && offset == 0) {
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return *(uint32_t*)this->id;
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}
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if (size == 1 && offset < 4) {
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return this->id[offset];
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}
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ABORT_F("NubusMacID: invalid read size %d, offset %d!", size, offset);
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return 0;
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};
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/* not writable */
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void write(uint32_t rgn_start, uint32_t offset, uint32_t value, int size) {};
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private:
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uint8_t id[4];
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};
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/**
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TNT-style machines and derivatives provide two board registers
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telling whether some particular piece of HW is installed or not.
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Both board registers are attached to the IOBus of the I/O controller.
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See machines/machinetnt.cpp for further details.
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**/
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class BoardRegister : public HWComponent, public IobusDevice {
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public:
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BoardRegister(std::string name, const uint16_t data) {
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this->set_name(name);
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supports_types(HWCompType::IOBUS_DEV);
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this->data = data;
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};
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~BoardRegister() = default;
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uint16_t iodev_read(uint32_t address) {
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return (!address) ? this->data : 0xFFFFU;
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};
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// appears read-only to guest
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void iodev_write(uint32_t address, uint16_t value) {};
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void update_bits(const uint16_t val, const uint16_t mask) {
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this->data = (this->data & ~mask) | (val & mask);
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};
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private:
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uint16_t data;
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};
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/**
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The machine ID for the Gossamer board is accesible at 0xFF000004 (phys).
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It contains a 16-bit value revealing machine's capabilities like bus speed,
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ROM speed, I/O configuration etc.
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See machines/machinegossamer.cpp for further details.
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*/
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class GossamerID : public MMIODevice {
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public:
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GossamerID(const uint16_t id) {
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this->id = id;
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this->name = "Machine-id";
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supports_types(HWCompType::MMIO_DEV);
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};
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~GossamerID() = default;
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uint32_t read(uint32_t rgn_start, uint32_t offset, int size) {
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return ((offset == 4 && size == 2) ? this->id : 0);
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};
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/* not writable */
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void write(uint32_t rgn_start, uint32_t offset, uint32_t value, int size) {};
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private:
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uint16_t id;
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};
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#endif // MACHINE_ID_H
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