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+/*****************************************************************************
+
+ 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 __SYSTEMC_EXT_TLM_CORE_2_INTERFACES_DMI_HH__
+#define __SYSTEMC_EXT_TLM_CORE_2_INTERFACES_DMI_HH__
+
+#include <systemc>
+
+namespace tlm
+{
+
+class tlm_dmi
+{
+ public:
+ // Enum for indicating the access granted to the initiator.
+ // The initiator uses gp.m_command to indicate it intention (read/write)
+ // The target is allowed to promote DMI_ACCESS_READ or DMI_ACCESS_WRITE
+ // requests to dmi_access_read_write.
+
+ enum dmi_access_e {
+ DMI_ACCESS_NONE = 0x00, // no access
+ DMI_ACCESS_READ = 0x01, // read access
+ DMI_ACCESS_WRITE = 0x02, // write access
+ DMI_ACCESS_READ_WRITE = DMI_ACCESS_READ | DMI_ACCESS_WRITE
+ // read/write access
+ };
+
+ tlm_dmi() { init(); }
+
+ void
+ init()
+ {
+ m_dmi_ptr = nullptr;
+ m_dmi_start_address = 0x0;
+ m_dmi_end_address = (sc_dt::uint64)(-1);
+ m_dmi_access = DMI_ACCESS_NONE;
+ m_dmi_read_latency = sc_core::SC_ZERO_TIME;
+ m_dmi_write_latency = sc_core::SC_ZERO_TIME;
+ }
+
+ unsigned char *get_dmi_ptr() const { return m_dmi_ptr; }
+ sc_dt::uint64 get_start_address() const { return m_dmi_start_address; }
+ sc_dt::uint64 get_end_address() const { return m_dmi_end_address; }
+ sc_core::sc_time get_read_latency() const { return m_dmi_read_latency; }
+ sc_core::sc_time get_write_latency() const { return m_dmi_write_latency; }
+ dmi_access_e get_granted_access() const { return m_dmi_access; }
+ bool is_none_allowed() const { return m_dmi_access == DMI_ACCESS_NONE; }
+ bool
+ is_read_allowed() const
+ {
+ return (m_dmi_access & DMI_ACCESS_READ) == DMI_ACCESS_READ;
+ }
+ bool
+ is_write_allowed() const
+ {
+ return (m_dmi_access & DMI_ACCESS_WRITE) == DMI_ACCESS_WRITE;
+ }
+ bool
+ is_read_write_allowed() const
+ {
+ return (m_dmi_access & DMI_ACCESS_READ_WRITE) == DMI_ACCESS_READ_WRITE;
+ }
+
+ void set_dmi_ptr(unsigned char *p) { m_dmi_ptr = p; }
+ void set_start_address(sc_dt::uint64 addr) { m_dmi_start_address = addr; }
+ void set_end_address(sc_dt::uint64 addr) { m_dmi_end_address = addr; }
+ void set_read_latency(sc_core::sc_time t) { m_dmi_read_latency = t; }
+ void set_write_latency(sc_core::sc_time t) { m_dmi_write_latency = t; }
+ void set_granted_access(dmi_access_e a) { m_dmi_access = a; }
+ void allow_none() { m_dmi_access = DMI_ACCESS_NONE; }
+ void allow_read() { m_dmi_access = DMI_ACCESS_READ; }
+ void allow_write() { m_dmi_access = DMI_ACCESS_WRITE; }
+ void allow_read_write() { m_dmi_access = DMI_ACCESS_READ_WRITE; }
+
+ private:
+ // If the forward call is successful, the target returns the dmi_ptr,
+ // which must point to the data element corresponding to the
+ // dmi_start_address. The data is organized as a byte array with the
+ // endianness of the target (endianness member of the tlm_dmi struct).
+
+ unsigned char *m_dmi_ptr;
+
+ // The absolute start and end addresses of the DMI region. If the decoder
+ // logic in the interconnect changes the address field e.g. by masking, the
+ // interconnect is responsible to transform the relative address back to an
+ // absolute address again.
+
+ sc_dt::uint64 m_dmi_start_address;
+ sc_dt::uint64 m_dmi_end_address;
+
+ // Granted access
+
+ dmi_access_e m_dmi_access;
+
+ // These members define the latency of read/write transactions. The
+ // initiator must initialize these members to zero before requesting a
+ // dmi pointer, because both the interconnect as well as the target can
+ // add to the total transaction latency.
+ // Depending on the 'type' attribute only one, or both of these attributes
+ // will be valid.
+
+ sc_core::sc_time m_dmi_read_latency;
+ sc_core::sc_time m_dmi_write_latency;
+};
+
+} // namespace tlm
+
+#endif /* __SYSTEMC_EXT_TLM_CORE_2_INTERFACES_DMI_HH__ */