RASCSI/cpp/devices/disk_cache.h
Uwe Seimet b7cb23e391
Add statistics and make scsictl accept generic key/value parameters (#1237/#1238) (#1262)
* Add statistics and make scsictl accept generic key/value parameters
2023-10-30 13:32:45 +01:00

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//---------------------------------------------------------------------------
//
// X68000 EMULATOR "XM6"
//
// Copyright (C) 2001-2006 (ytanaka@ipc-tokai.or.jp)
// Copyright (C) 2014-2020 GIMONS
//
// XM6i
// Copyright (C) 2010-2015 isaki@NetBSD.org
//
// Imported sava's Anex86/T98Next image and MO format support patch.
// Comments translated to english by akuker.
//
//---------------------------------------------------------------------------
#pragma once
#include "generated/piscsi_interface.pb.h"
#include <span>
#include <array>
#include <memory>
#include <string>
using namespace std;
using namespace piscsi_interface;
class DiskCache
{
// Number of tracks to cache
static const int CACHE_MAX = 16;
uint64_t read_error_count = 0;
uint64_t write_error_count = 0;
uint64_t cache_miss_read_count = 0;
uint64_t cache_miss_write_count = 0;
inline static const string READ_ERROR_COUNT = "read_error_count";
inline static const string WRITE_ERROR_COUNT = "write_error_count";
inline static const string CACHE_MISS_READ_COUNT = "cache_miss_read_count";
inline static const string CACHE_MISS_WRITE_COUNT = "cache_miss_write_count";
public:
// Internal data definition
using cache_t = struct {
shared_ptr<DiskTrack> disktrk; // Disk Track
uint32_t serial; // Serial
};
DiskCache(const string&, int, uint32_t, off_t = 0);
~DiskCache() = default;
void SetRawMode(bool b) { cd_raw = b; } // CD-ROM raw mode setting
bool Save(); // Save and release all
bool ReadSector(span<uint8_t>, uint32_t); // Sector Read
bool WriteSector(span<const uint8_t>, uint32_t); // Sector Write
vector<PbStatistics> GetStatistics(bool) const;
private:
// Internal Management
shared_ptr<DiskTrack> Assign(int);
shared_ptr<DiskTrack> GetTrack(uint32_t);
bool Load(int index, int track, shared_ptr<DiskTrack>);
void UpdateSerialNumber();
// Internal data
array<cache_t, CACHE_MAX> cache = {}; // Cache management
uint32_t serial = 0; // Last serial number
string sec_path; // Path
int sec_size; // Sector Size (8=256, 9=512, 10=1024, 11=2048, 12=4096)
int sec_blocks; // Blocks per sector
bool cd_raw = false; // CD-ROM RAW mode
off_t imgoffset; // Offset to actual data
};