dingusppc/devices/machineid.h
2020-03-14 14:26:30 +01:00

64 lines
2.0 KiB
C++

/*
DingusPPC - The Experimental PowerPC Macintosh emulator
Copyright (C) 2018-20 divingkatae and maximum
(theweirdo) spatium
(Contact divingkatae#1017 or powermax#2286 on Discord for more info)
This program 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 3 of the License, or
(at your option) any later version.
This program 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
along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#ifndef MACHINE_ID_H
#define MACHINE_ID_H
#include <cinttypes>
#include "hwcomponent.h"
#include "mmiodevice.h"
/**
@file Contains definitions for PowerMacintosh machine ID registers.
The machine ID register is a memory-based register containing hardcoded
values the system software can read to identify machine/board it's running on.
Register location and value meaning are board-dependent.
*/
/**
The machine ID for the Gossamer board is accesible at 0xFF000004 (phys).
It contains a 16-bit value revealing machine's capabilities like bus speed,
ROM speed, I/O configuration etc.
Because the meaning of these bits is poorly documented, the code below
simply return a raw value obtained from real hardware.
*/
class GossamerID : public MMIODevice {
public:
GossamerID(const uint16_t id) { this->id = id, this->name = "Machine-id"; };
~GossamerID() = default;
bool supports_type(HWCompType type) {
return type == HWCompType::MMIO_DEV;
};
uint32_t read(uint32_t offset, int size) {
return ((!offset && size == 2) ? this->id : 0); };
void write(uint32_t offset, uint32_t value, int size) {}; /* not writable */
private:
uint16_t id;
};
#endif /* MACHINE_ID_H */