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#ifndef _RISCV_DEVICES_H
#define _RISCV_DEVICES_H
#include "decode.h"
#include "mmio_plugin.h"
#include <cstdlib>
#include <string>
#include <map>
#include <vector>
#include <stdexcept>
#include <utility>
class processor_t;
class abstract_device_t {
public:
virtual bool load(reg_t addr, size_t len, uint8_t* bytes) = 0;
virtual bool store(reg_t addr, size_t len, const uint8_t* bytes) = 0;
virtual ~abstract_device_t() {}
};
class bus_t : public abstract_device_t {
public:
bool load(reg_t addr, size_t len, uint8_t* bytes);
bool store(reg_t addr, size_t len, const uint8_t* bytes);
void add_device(reg_t addr, abstract_device_t* dev);
std::pair<reg_t, abstract_device_t*> find_device(reg_t addr);
private:
std::map<reg_t, abstract_device_t*> devices;
};
class rom_device_t : public abstract_device_t {
public:
rom_device_t(std::vector<char> data);
bool load(reg_t addr, size_t len, uint8_t* bytes);
bool store(reg_t addr, size_t len, const uint8_t* bytes);
const std::vector<char>& contents() { return data; }
private:
std::vector<char> data;
};
class mem_t : public abstract_device_t {
public:
mem_t(size_t size) : len(size) {
if (!size)
throw std::runtime_error("zero bytes of target memory requested");
data = nullptr;
}
mem_t(const mem_t& that) = delete;
~mem_t() {
free(data);
}
bool load(reg_t addr, size_t len, uint8_t* bytes) { return false; }
bool store(reg_t addr, size_t len, const uint8_t* bytes) { return false; }
char* contents();
char* contents(reg_t addr);
size_t size() { return len; }
private:
std::map<reg_t, std::pair<char*, bool>> acc_tbl;
char* data;
size_t len;
};
class clint_t : public abstract_device_t {
public:
clint_t(std::vector<processor_t*>&, uint64_t freq_hz, bool real_time);
bool load(reg_t addr, size_t len, uint8_t* bytes);
bool store(reg_t addr, size_t len, const uint8_t* bytes);
size_t size() { return CLINT_SIZE; }
void increment(reg_t inc);
private:
typedef uint64_t mtime_t;
typedef uint64_t mtimecmp_t;
typedef uint32_t msip_t;
std::vector<processor_t*>& procs;
uint64_t freq_hz;
bool real_time;
uint64_t real_time_ref_secs;
uint64_t real_time_ref_usecs;
mtime_t mtime;
std::vector<mtimecmp_t> mtimecmp;
};
class mmio_plugin_device_t : public abstract_device_t {
public:
mmio_plugin_device_t(const std::string& name, const std::string& args);
virtual ~mmio_plugin_device_t() override;
virtual bool load(reg_t addr, size_t len, uint8_t* bytes) override;
virtual bool store(reg_t addr, size_t len, const uint8_t* bytes) override;
private:
mmio_plugin_t plugin;
void* user_data;
};
#endif
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