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#ifndef RUBYPORT_H
#define RUBYPORT_H
#include "mem/ruby/libruby.hh"
#include <string>
#include <assert.h>
using namespace std;
class RubyPort {
public:
RubyPort(const string & name)
: m_name(name)
{
m_port_id = m_num_ports++;
m_request_cnt = 0;
m_hit_callback = NULL;
assert(m_num_ports <= 2048); // see below for reason
}
virtual ~RubyPort() {}
virtual int64_t makeRequest(const RubyRequest & request) = 0;
void registerHitCallback(void (*hit_callback)(int64_t request_id)) {
assert(m_hit_callback == NULL); // can't assign hit_callback twice
m_hit_callback = hit_callback;
}
protected:
const string m_name;
void (*m_hit_callback)(int64_t);
int64_t makeUniqueRequestID() {
// The request ID is generated by combining the port ID with a request count
// so that request IDs can be formed concurrently by multiple threads.
// IDs are formed as follows:
//
//
// 0 PortID Request Count
// +----+---------------+-----------------------------------------------------+
// | 63 | 62-48 | 47-0 |
// +----+---------------+-----------------------------------------------------+
//
//
// This limits the system to a maximum of 2^11 == 2048 components
// and 2^48 ~= 3x10^14 requests per component
int64_t id = (static_cast<uint64_t>(m_port_id) << 48) | m_request_cnt;
m_request_cnt++;
// assert((m_request_cnt & (1<<48)) == 0);
return id;
}
private:
static uint16_t m_num_ports;
uint16_t m_port_id;
uint64_t m_request_cnt;
};
#endif
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