dingusppc/devices/common/machineid.h
2021-10-23 21:00:31 +02:00

102 lines
3.0 KiB
C++

/*
DingusPPC - The Experimental PowerPC Macintosh emulator
Copyright (C) 2018-21 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 <devices/common/hwcomponent.h>
#include <devices/common/mmiodevice.h>
#include <cinttypes>
/**
@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.
*/
/**
Machine ID register for Nubus Power Macs.
It's located at physical address 0x5FFFFFFC and contains four bytes:
+0 uint16_t signature = 0xA55A
+1 uint8_t machine_type (3 - PowerMac)
+2 uint8_t model (0x10 = PDM, 0x12 = Carl Sagan, 0x13 = Cold Fusion)
*/
class NubusMacID : public MMIODevice {
public:
NubusMacID(const uint16_t id) {
this->name = "Nubus-Machine-id";
this->id[0] = 0xA5;
this->id[1] = 0x5A;
this->id[2] = (id >> 8) & 0xFF;
this->id[3] = id & 0xFF;
};
~NubusMacID() = default;
bool supports_type(HWCompType type) {
return type == HWCompType::MMIO_DEV;
};
uint32_t read(uint32_t reg_start, uint32_t offset, int size) {
return (offset < 4 ? this->id[offset] : 0);
};
/* not writable */
void write(uint32_t reg_start, uint32_t offset, uint32_t value, int size) {};
private:
uint8_t id[4];
};
/**
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 reg_start, uint32_t offset, int size) {
return ((!offset && size == 2) ? this->id : 0);
};
/* not writable */
void write(uint32_t reg_start, uint32_t offset, uint32_t value, int size) {};
private:
uint16_t id;
};
#endif /* MACHINE_ID_H */