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38 lines
1.1 KiB
C++
38 lines
1.1 KiB
C++
#ifndef MACHINE_ID_H
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#define MACHINE_ID_H
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#include <cinttypes>
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#include "mmiodevice.h"
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/**
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@file Contains definitions for PowerMacintosh 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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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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Because the meaning of these bits is poorly documented, the code below
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simply return a raw value obtained from real hardware.
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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) { this->id = id, this->name = "Machine-id"; };
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~GossamerID() = default;
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uint32_t read(uint32_t offset, int size) {
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return ((!offset && size == 2) ? this->id : 0); };
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void write(uint32_t offset, uint32_t value, int size) {}; /* not writable */
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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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