cpu: Add HTM CPU API
JIRA: https://gem5.atlassian.net/browse/GEM5-587
Change-Id: Iff95eb97603b4cb9629c04382a824b02594ee5c7
Signed-off-by: Giacomo Travaglini <giacomo.travaglini@arm.com>
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/30322
Reviewed-by: Jason Lowe-Power <power.jg@gmail.com>
Maintainer: Jason Lowe-Power <power.jg@gmail.com>
Tested-by: kokoro <noreply+kokoro@google.com>
diff --git a/src/cpu/o3/cpu.cc b/src/cpu/o3/cpu.cc
index 562a332..613ffd1 100644
--- a/src/cpu/o3/cpu.cc
+++ b/src/cpu/o3/cpu.cc
@@ -1,5 +1,5 @@
/*
- * Copyright (c) 2011-2012, 2014, 2016, 2017, 2019 ARM Limited
+ * Copyright (c) 2011-2012, 2014, 2016, 2017, 2019-2020 ARM Limited
* Copyright (c) 2013 Advanced Micro Devices, Inc.
* All rights reserved
*
@@ -1827,5 +1827,13 @@
}
}
+template <class Impl>
+void
+FullO3CPU<Impl>::htmSendAbortSignal(ThreadID tid, uint64_t htmUid,
+ HtmFailureFaultCause cause)
+{
+ panic("not yet supported!");
+}
+
// Forward declaration of FullO3CPU.
template class FullO3CPU<O3CPUImpl>;
diff --git a/src/cpu/o3/cpu.hh b/src/cpu/o3/cpu.hh
index cc0e2cd..137fbc8 100644
--- a/src/cpu/o3/cpu.hh
+++ b/src/cpu/o3/cpu.hh
@@ -1,5 +1,5 @@
/*
- * Copyright (c) 2011-2013, 2016-2019 ARM Limited
+ * Copyright (c) 2011-2013, 2016-2020 ARM Limited
* Copyright (c) 2013 Advanced Micro Devices, Inc.
* All rights reserved
*
@@ -788,6 +788,11 @@
//number of misc
Stats::Scalar miscRegfileReads;
Stats::Scalar miscRegfileWrites;
+
+ public:
+ // hardware transactional memory
+ void htmSendAbortSignal(ThreadID tid, uint64_t htm_uid,
+ HtmFailureFaultCause cause);
};
#endif // __CPU_O3_CPU_HH__
diff --git a/src/cpu/simple/atomic.hh b/src/cpu/simple/atomic.hh
index 7333e1f..2d0a465 100644
--- a/src/cpu/simple/atomic.hh
+++ b/src/cpu/simple/atomic.hh
@@ -1,5 +1,5 @@
/*
- * Copyright (c) 2012-2013, 2015, 2018 ARM Limited
+ * Copyright (c) 2012-2013, 2015, 2018, 2020 ARM Limited
* All rights reserved.
*
* The license below extends only to copyright in the software and shall
@@ -219,6 +219,18 @@
const std::vector<bool>& byte_enable = std::vector<bool>())
override;
+ Fault initiateHtmCmd(Request::Flags flags) override
+ {
+ panic("initiateHtmCmd() is for timing accesses, and should "
+ "never be called on AtomicSimpleCPU.\n");
+ }
+
+ void htmSendAbortSignal(HtmFailureFaultCause cause) override
+ {
+ panic("htmSendAbortSignal() is for timing accesses, and should "
+ "never be called on AtomicSimpleCPU.\n");
+ }
+
Fault writeMem(uint8_t *data, unsigned size,
Addr addr, Request::Flags flags, uint64_t *res,
const std::vector<bool>& byte_enable = std::vector<bool>())
diff --git a/src/cpu/simple/base.hh b/src/cpu/simple/base.hh
index 9f5bf66..82f52d9 100644
--- a/src/cpu/simple/base.hh
+++ b/src/cpu/simple/base.hh
@@ -176,6 +176,21 @@
void serializeThread(CheckpointOut &cp, ThreadID tid) const override;
void unserializeThread(CheckpointIn &cp, ThreadID tid) override;
+ /** Hardware transactional memory commands (HtmCmds), e.g. start a
+ * transaction and commit a transaction, are memory operations but are
+ * neither really (true) loads nor stores. For this reason the interface
+ * is extended and initiateHtmCmd() is used to instigate the command. */
+ virtual Fault initiateHtmCmd(Request::Flags flags) = 0;
+
+ /** This function is used to instruct the memory subsystem that a
+ * transaction should be aborted and the speculative state should be
+ * thrown away. This is called in the transaction's very last breath in
+ * the core. Afterwards, the core throws away its speculative state and
+ * resumes execution at the point the transaction started, i.e. reverses
+ * time. When instruction execution resumes, the core expects the
+ * memory subsystem to be in a stable, i.e. pre-speculative, state as
+ * well. */
+ virtual void htmSendAbortSignal(HtmFailureFaultCause cause) = 0;
};
#endif // __CPU_SIMPLE_BASE_HH__
diff --git a/src/cpu/simple/timing.cc b/src/cpu/simple/timing.cc
index 84d7d0e..d3adbcc 100644
--- a/src/cpu/simple/timing.cc
+++ b/src/cpu/simple/timing.cc
@@ -1055,6 +1055,19 @@
dcachePort.printAddr(a);
}
+Fault
+TimingSimpleCPU::initiateHtmCmd(Request::Flags flags)
+{
+ panic("not yet supported!");
+ return NoFault;
+}
+
+void
+TimingSimpleCPU::htmSendAbortSignal(HtmFailureFaultCause cause)
+{
+ panic("not yet supported!");
+}
+
////////////////////////////////////////////////////////////////////////
//
diff --git a/src/cpu/simple/timing.hh b/src/cpu/simple/timing.hh
index 2bb0fe6..c055896 100644
--- a/src/cpu/simple/timing.hh
+++ b/src/cpu/simple/timing.hh
@@ -1,5 +1,5 @@
/*
- * Copyright (c) 2012-2013,2015,2018 ARM Limited
+ * Copyright (c) 2012-2013,2015,2018,2020 ARM Limited
* All rights reserved
*
* The license below extends only to copyright in the software and shall
@@ -320,6 +320,11 @@
*/
void finishTranslation(WholeTranslationState *state);
+ /** hardware transactional memory **/
+ Fault initiateHtmCmd(Request::Flags flags) override;
+
+ void htmSendAbortSignal(HtmFailureFaultCause) override;
+
private:
EventFunctionWrapper fetchEvent;
