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#ifndef CACHE_H
#define CACHE_H
#include <memory.h>
#include <machineconfig.h>
#include <stdint.h>
#include <time.h>
namespace machine {
class Cache : public MemoryAccess {
Q_OBJECT
public:
Cache(Memory *m, const MachineConfigCache *c, unsigned memory_access_penalty_r = 1, unsigned memory_access_penalty_w = 1);
void wword(std::uint32_t address, std::uint32_t value);
std::uint32_t rword(std::uint32_t address) const;
void flush(); // flush cache
void sync(); // Same as flush
unsigned hit() const; // Number of recorded hits
unsigned miss() const; // Number of recorded misses
unsigned stalled_cycles() const; // Number of wasted cycles in memory waitin statistic
double speed_improvement() const; // Speed improvement in percents in comare with no used cache
double usage_efficiency() const; // Usage efficiency in percents
void reset(); // Reset whole state of cache
const MachineConfigCache &config() const;
signals:
void hit_update(unsigned) const;
void miss_update(unsigned) const;
void statistics_update(unsigned stalled_cycles, double speed_improv, double usage_effic) const;
void cache_update(unsigned associat, unsigned set, bool valid, bool dirty, std::uint32_t tag, const std::uint32_t *data) const;
private:
MachineConfigCache cnf;
Memory *mem;
unsigned access_pen_r, access_pen_w;
struct cache_data {
bool valid, dirty;
std::uint32_t tag;
std::uint32_t *data;
};
mutable struct cache_data **dt;
union {
time_t ** lru; // Access time
unsigned **lfu; // Access count
} replc; // Data used for replacement policy
mutable unsigned hit_read, miss_read, hit_write, miss_write; // Hit and miss counters
void access(std::uint32_t address, std::uint32_t *data, bool write, std::uint32_t value = 0) const;
void kick(unsigned associat_indx, unsigned row) const;
std::uint32_t base_address(std::uint32_t tag, unsigned row) const;
void update_statistics() const;
};
}
#endif // CACHE_H
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