1#ifndef RUBYPORT_H
2#define RUBYPORT_H
3
4#include "mem/ruby/libruby.hh"
5#include <string>
6#include <assert.h>
7
8using namespace std;
9
10class RubyPort {
11public:
12 RubyPort(const string & name)
13 : m_name(name)
14 {
15 m_port_id = m_num_ports++;
16 m_request_cnt = 0;
17 m_hit_callback = NULL;
18 assert(m_num_ports <= 2048); // see below for reason
19 }
20 virtual ~RubyPort() {}
21
22 virtual int64_t makeRequest(const RubyRequest & request) = 0;
23
24 void registerHitCallback(void (*hit_callback)(int64_t request_id)) {
25 assert(m_hit_callback == NULL); // can't assign hit_callback twice
26 m_hit_callback = hit_callback;
27 }
28
29protected:
30 const string m_name;
31 void (*m_hit_callback)(int64_t);
32
33 int64_t makeUniqueRequestID() {
34 // The request ID is generated by combining the port ID with a request count
35 // so that request IDs can be formed concurrently by multiple threads.
36 // IDs are formed as follows:
37 //
38 //
39 // 0 PortID Request Count
40 // +----+---------------+-----------------------------------------------------+
41 // | 63 | 62-48 | 47-0 |
42 // +----+---------------+-----------------------------------------------------+
43 //
44 //
45 // This limits the system to a maximum of 2^11 == 2048 components
46 // and 2^48 ~= 3x10^14 requests per component
47
48 int64_t id = (static_cast<uint64_t>(m_port_id) << 48) | m_request_cnt;
49 m_request_cnt++;
50 // assert((m_request_cnt & (1<<48)) == 0);
51 return id;
52 }
53
54private:
55 static uint16_t m_num_ports;
56 uint16_t m_port_id;
57 uint64_t m_request_cnt;
58};
59
60#endif