arm: Add AArch64 hypervisor call instruction 'hvc'

This patch adds the AArch64 instruction hvc which raises an exception
from EL1 into EL2. The host OS uses this instruction to world switch
into the guest.

Change-Id: I930ee43f4f0abd4b35a68eb2a72e44e3ea6570be

1 files changed, 19 insertions, 1 deletions

diff --git a/src/arch/arm/isa/insts/misc64.isa b/src/arch/arm/isa/insts/misc64.isa
index 7e88bebbb..08902abe8 100644
--- a/src/arch/arm/isa/insts/misc64.isa
+++ b/src/arch/arm/isa/insts/misc64.isa
@@ -1,6 +1,6 @@
 // -*- mode:c++ -*-
 
-// Copyright (c) 2011-2013 ARM Limited
+// Copyright (c) 2011-2013, 2016 ARM Limited
 // All rights reserved
 //
 // The license below extends only to copyright in the software and shall
@@ -49,6 +49,24 @@ let {{
     decoder_output = BasicConstructor64.subst(svcIop)
     exec_output = BasicExecute.subst(svcIop)
 
+    hvcCode = '''
+    SCR scr = Scr64;
+
+    if (!ArmSystem::haveVirtualization(xc->tcBase()) ||
+        (ArmSystem::haveSecurity(xc->tcBase()) && !scr.hce)) {
+        fault = disabledFault();
+    } else {
+        fault = std::make_shared<HypervisorCall>(machInst, bits(machInst, 20, 5));
+    }
+    '''
+
+    hvcIop = InstObjParams("hvc", "Hvc64", "ArmStaticInst",
+                           hvcCode, ["IsSyscall", "IsNonSpeculative",
+                                     "IsSerializeAfter"])
+    header_output += BasicDeclare.subst(hvcIop)
+    decoder_output += BasicConstructor64.subst(hvcIop)
+    exec_output += BasicExecute.subst(hvcIop)
+
     # @todo: extend to take into account Virtualization.
     smcCode = '''
     SCR scr = Scr64;