dev-arm: Add a GIC interrupt adaptor

Add GIC-based interrupt adaptor implementations that support PPI
(ArmPPI) and SPI (ArmSPI) delivery. In addition to being useful for
"normal" memory-mapped devices, the PPI adaptor makes it possible to
use the same device model to generate both PPIs and SPIs (e.g., the
PMU).

Change-Id: I73d6591c168040faef2443430c4f1da10c387a2a
Signed-off-by: Andreas Sandberg <andreas.sandberg@arm.com>
Reviewed-by: Nikos Nikoleris <nikos.nikoleris@arm.com>
Reviewed-on: https://gem5-review.googlesource.com/2521
Reviewed-by: Giacomo Travaglini <giacomo.travaglini@arm.com>

1 files changed, 81 insertions, 1 deletions

diff --git a/src/dev/arm/base_gic.cc b/src/dev/arm/base_gic.cc
index ece8352d3..65754d018 100644
--- a/src/dev/arm/base_gic.cc
+++ b/src/dev/arm/base_gic.cc
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2012 ARM Limited
+ * Copyright (c) 2012, 2017-2018 ARM Limited
  * All rights reserved
  *
  * The license below extends only to copyright in the software and shall
@@ -39,7 +39,11 @@
 
 #include "dev/arm/base_gic.hh"
 
+#include "cpu/thread_context.hh"
 #include "dev/arm/realview.hh"
+#include "params/ArmInterruptPin.hh"
+#include "params/ArmPPI.hh"
+#include "params/ArmSPI.hh"
 #include "params/BaseGic.hh"
 
 BaseGic::BaseGic(const Params *p)
@@ -65,3 +69,79 @@ BaseGic::params() const
 {
     return dynamic_cast<const Params *>(_params);
 }
+
+
+ArmInterruptPin::ArmInterruptPin(const ArmInterruptPinParams *p)
+    : SimObject(p),
+      threadContext(nullptr),
+      platform(dynamic_cast<RealView*>(p->platform)),
+      intNum(p->num)
+{
+    fatal_if(!platform, "Interrupt not connected to a RealView platform");
+}
+
+void
+ArmInterruptPin::setThreadContext(ThreadContext *tc)
+{
+    panic_if(threadContext,
+             "InterruptLine::setThreadContext called twice\n");
+
+    threadContext = tc;
+}
+
+ContextID
+ArmInterruptPin::targetContext() const
+{
+    panic_if(!threadContext, "Per-context interrupt triggered without a " \
+             "call to InterruptLine::setThreadContext.\n");
+    return threadContext->contextId();
+}
+
+
+
+ArmSPI::ArmSPI(const ArmSPIParams *p)
+    : ArmInterruptPin(p)
+{
+}
+
+void
+ArmSPI::raise()
+{
+    platform->gic->sendInt(intNum);
+}
+
+void
+ArmSPI::clear()
+{
+    platform->gic->clearInt(intNum);
+}
+
+ArmPPI::ArmPPI(const ArmPPIParams *p)
+    : ArmInterruptPin(p)
+{
+}
+
+void
+ArmPPI::raise()
+{
+    platform->gic->sendPPInt(intNum, targetContext());
+}
+
+void
+ArmPPI::clear()
+{
+    platform->gic->clearPPInt(intNum, targetContext());
+}
+
+
+ArmSPI *
+ArmSPIParams::create()
+{
+    return new ArmSPI(this);
+}
+
+ArmPPI *
+ArmPPIParams::create()
+{
+    return new ArmPPI(this);
+}