dingusppc/devices/common/nvram.cpp

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/*
DingusPPC - The Experimental PowerPC Macintosh emulator
Copyright (C) 2018-23 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/>.
*/
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#include <devices/common/hwcomponent.h>
#include <devices/common/nvram.h>
#include <devices/deviceregistry.h>
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#include <cinttypes>
#include <cstring>
#include <fstream>
#include <iostream>
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#include <loguru.hpp>
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/** @file Non-volatile RAM implementation.
*/
using namespace std;
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/** the signature for NVRAM backing file identification. */
static char NVRAM_FILE_ID[] = "DINGUSPPCNVRAM";
NVram::NVram(std::string file_name, uint32_t ram_size)
{
this->name = "NVRAM";
supports_types(HWCompType::NVRAM);
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this->file_name = file_name;
this->ram_size = ram_size;
// allocate memory storage and fill it with zeroes
this->storage = std::unique_ptr<uint8_t[]>(new uint8_t[ram_size] ());
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this->init();
}
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NVram::~NVram() {
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this->save();
}
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uint8_t NVram::read_byte(uint32_t offset) {
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return (this->storage[offset]);
}
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void NVram::write_byte(uint32_t offset, uint8_t val) {
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this->storage[offset] = val;
}
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void NVram::init() {
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char sig[sizeof(NVRAM_FILE_ID)];
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uint16_t data_size;
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ifstream f(this->file_name, ios::in | ios::binary);
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if (f.fail() || !f.read(sig, sizeof(NVRAM_FILE_ID)) ||
!f.read((char*)&data_size, sizeof(data_size)) ||
memcmp(sig, NVRAM_FILE_ID, sizeof(NVRAM_FILE_ID)) || data_size != this->ram_size ||
!f.read((char*)this->storage.get(), this->ram_size)) {
LOG_F(WARNING, "Could not restore NVRAM content from the given file.");
}
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f.close();
}
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void NVram::save() {
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ofstream f(this->file_name, ios::out | ios::binary);
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/* write file identification */
f.write(NVRAM_FILE_ID, sizeof(NVRAM_FILE_ID));
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f.write((char*)&this->ram_size, sizeof(this->ram_size));
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/* write NVRAM content */
f.write((char*)this->storage.get(), this->ram_size);
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f.close();
}
static const DeviceDescription Nvram_Descriptor = {
NVram::create, {}, {}
};
REGISTER_DEVICE(NVRAM, Nvram_Descriptor);