dingusppc/devices/machineid.h
2019-10-14 17:43:39 +02:00

38 lines
1.1 KiB
C++

#ifndef MACHINE_ID_H
#define MACHINE_ID_H
#include <cinttypes>
#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 raw values obtained from real hardware.
*/
class GossamerID : public MMIODevice {
public:
GossamerID(const uint16_t id) { this->id = id, this->name = "Machine-id"; };
~GossamerID() = default;
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 */