67 lines
2.1 KiB
C++
67 lines
2.1 KiB
C++
/*
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DingusPPC - The Experimental PowerPC Macintosh emulator
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Copyright (C) 2018-20 divingkatae and maximum
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(theweirdo) spatium
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(Contact divingkatae#1017 or powermax#2286 on Discord for more info)
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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#ifndef MACHINE_ID_H
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#define MACHINE_ID_H
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#include "hwcomponent.h"
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#include "mmiodevice.h"
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#include <cinttypes>
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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) {
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this->id = id, this->name = "Machine-id";
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};
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~GossamerID() = default;
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bool supports_type(HWCompType type) {
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return type == HWCompType::MMIO_DEV;
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};
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uint32_t read(uint32_t reg_start, uint32_t offset, int size) {
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return ((!offset && size == 2) ? this->id : 0);
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};
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void write(uint32_t reg_start, 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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