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