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◆ main openmsx / src / memory / SRAM.cc
3.6 KiB · C++ · last changed chore(): initial commit 1 month ago source blame history raw
e8555c89 Andy McCall 1 
#include "SRAM.hh"
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#include "DeviceConfig.hh"
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#include "File.hh"
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#include "FileContext.hh"
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#include "FileException.hh"
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#include "FileNotFoundException.hh"
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#include "MSXCliComm.hh"
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#include "Reactor.hh"
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#include "serialize.hh"
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#include "small_buffer.hh"
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#include <algorithm>
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namespace openmsx {
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// class SRAM
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// Like the constructor below, but doesn't create a debuggable.
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// For use in unit-tests.
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SRAM::SRAM(size_t size, const XMLElement& xml, DontLoadTag)
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	: ram(xml, size)
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{
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}
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/* Creates a SRAM that is not loaded from or saved to a file.
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 * The only reason to use this (instead of a plain Ram object) is when you
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 * dynamically need to decide whether load/save is needed.
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 */
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SRAM::SRAM(const std::string& name, static_string_view description,
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           size_t size, const DeviceConfig& config_, DontLoadTag)
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	: ram(config_, name, description, size)
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{
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}
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SRAM::SRAM(const std::string& name, size_t size,
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           const DeviceConfig& config_, const char* header_, bool* loaded)
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	: schedulable(std::in_place, config_.getReactor().getRTScheduler(), *this)
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	, config(config_)
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	, ram(config, name, "sram", size)
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	, header(header_)
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{
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	load(loaded);
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}
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SRAM::SRAM(const std::string& name, static_string_view description, size_t size,
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	   const DeviceConfig& config_, const char* header_, bool* loaded)
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	: schedulable(std::in_place, config_.getReactor().getRTScheduler(), *this)
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	, config(config_)
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	, ram(config, name, description, size)
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	, header(header_)
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{
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	load(loaded);
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}
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SRAM::~SRAM()
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{
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	if (schedulable && schedulable->isPendingRT()) {
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		schedulable->cancelRT();
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		save();
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	}
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}
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void SRAM::write(size_t addr, uint8_t value)
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{
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	if (schedulable && !schedulable->isPendingRT()) {
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		schedulable->scheduleRT(5000000); // sync to disk after 5s
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	}
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	assert(addr < size());
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	ram.write(addr, value);
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}
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void SRAM::memset(size_t addr, uint8_t c, size_t aSize)
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{
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	if (schedulable && !schedulable->isPendingRT()) {
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		schedulable->scheduleRT(5000000); // sync to disk after 5s
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	}
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	assert((addr + aSize) <= size());
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	std::ranges::fill(ram.getWriteBackdoor().subspan(addr, aSize), c);
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}
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void SRAM::load(bool* loaded)
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{
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	assert(config.getXML());
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	if (loaded) *loaded = false;
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	const auto& filename = config.getChildData("sramname");
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	try {
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		bool headerOk = true;
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		File file(config.getFileContext().resolveCreate(filename));
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		if (header) {
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			size_t length = strlen(header);
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			small_buffer<char, 64> buf(uninitialized_tag{}, length);
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			file.read(std::span{buf});
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			headerOk = std::ranges::equal(buf, std::span{header, length});
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		}
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		if (headerOk) {
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			file.read(ram.getWriteBackdoor());
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			if (loaded) *loaded = true;
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		} else {
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			config.getCliComm().printWarning(
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				"Warning no correct SRAM file: ", filename);
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		}
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	} catch (FileNotFoundException& /*e*/) {
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		// SRAM file not found, assuming blank SRAM content.
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	} catch (FileException& e) {
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		config.getCliComm().printWarning(
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			"Couldn't load SRAM ", filename,
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			" (", e.getMessage(), ").");
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	}
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}
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void SRAM::save() const
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{
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	assert(config.getXML());
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	const auto& filename = config.getChildData("sramname");
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	try {
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		File file(config.getFileContext().resolveCreate(filename),
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			  File::OpenMode::TRUNCATE);
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		if (header) {
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			auto length = strlen(header);
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			file.write(std::span{header, length});
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		}
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		file.write(std::span{ram});
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	} catch (FileException& e) {
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		config.getCliComm().printWarning(
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			"Couldn't save SRAM ", filename,
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			" (", e.getMessage(), ").");
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	}
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}
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void SRAM::SRAMSchedulable::executeRT()
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{
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	sram.save();
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}
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template<typename Archive>
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void SRAM::serialize(Archive& ar, unsigned /*version*/)
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{
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	ar.serialize("ram", ram);
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}
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INSTANTIATE_SERIALIZE_METHODS(SRAM);
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} // namespace openmsx