mirror of
https://github.com/dingusdev/dingusppc.git
synced 2024-12-26 09:29:28 +00:00
102 lines
3.0 KiB
C++
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 */
|