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Diffstat (limited to 'ext/systemc/src/tlm_core/tlm_2/tlm_quantum/tlm_global_quantum.h')
-rw-r--r-- | ext/systemc/src/tlm_core/tlm_2/tlm_quantum/tlm_global_quantum.h | 97 |
1 files changed, 97 insertions, 0 deletions
diff --git a/ext/systemc/src/tlm_core/tlm_2/tlm_quantum/tlm_global_quantum.h b/ext/systemc/src/tlm_core/tlm_2/tlm_quantum/tlm_global_quantum.h new file mode 100644 index 000000000..eb36a898e --- /dev/null +++ b/ext/systemc/src/tlm_core/tlm_2/tlm_quantum/tlm_global_quantum.h @@ -0,0 +1,97 @@ +/***************************************************************************** + + Licensed to Accellera Systems Initiative Inc. (Accellera) under one or + more contributor license agreements. See the NOTICE file distributed + with this work for additional information regarding copyright ownership. + Accellera licenses this file to you under the Apache License, Version 2.0 + (the "License"); you may not use this file except in compliance with the + License. You may obtain a copy of the License at + + http://www.apache.org/licenses/LICENSE-2.0 + + Unless required by applicable law or agreed to in writing, software + distributed under the License is distributed on an "AS IS" BASIS, + WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or + implied. See the License for the specific language governing + permissions and limitations under the License. + + *****************************************************************************/ + +#ifndef __TLM_GLOBAL_QUANTUM_H__ +#define __TLM_GLOBAL_QUANTUM_H__ + +#include <systemc> + +namespace tlm { + +// +// tlm_global_quantum class +// +// The global quantum is the maximum time an initiator can run ahead of +// systemC time. All initiators should synchronize on timingpoints that +// are multiples of the global quantum value. +// +// sc_set_time_resolution can only be called before the first +// sc_time object is created. This means that after setting the +// global quantum it will not be possible to call sc_set_time_resolution. +// If sc_set_time_resolution must be called this must be done before +// the global quantum is set. +// + +class tlm_global_quantum +{ +public: + // + // Returns a reference to the tlm_global_quantum singleton + // + static tlm_global_quantum& instance() + { + static tlm_global_quantum instance_; + return instance_; + } + +public: + + // + // Setter/getter for the global quantum + // + void set(const sc_core::sc_time& t) + { + m_global_quantum = t; + } + + const sc_core::sc_time& get() const + { + return m_global_quantum; + } + + // + // This function will calculate the maximum value for the next local + // quantum for an initiator. All initiators should synchronize on + // integer multiples of the global quantum value. The value for the + // local quantum of an initiator can be smaller, but should never be + // greater than the value returned by this method. + // + sc_core::sc_time compute_local_quantum() + { + if (m_global_quantum != sc_core::SC_ZERO_TIME) { + const sc_core::sc_time current = sc_core::sc_time_stamp(); + const sc_core::sc_time g_quant = m_global_quantum; + return g_quant - (current % g_quant); + } else { + return sc_core::SC_ZERO_TIME; + } + } + +protected: + tlm_global_quantum() : m_global_quantum(sc_core::SC_ZERO_TIME) + { + } + +protected: + sc_core::sc_time m_global_quantum; +}; + +} // namespace tlm + +#endif |