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arm: Add AArch64 hypervisor call instruction 'hvc'

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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
This commit is contained in:
Dylan Johnson 2016-08-02 10:38:02 +01:00
parent c53a57f74f
commit 2950a95672
4 changed files with 30 additions and 4 deletions
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6
src/arch/arm/faults.cc
View file

@ -840,6 +840,12 @@ HypervisorCall::HypervisorCall(ExtMachInst _machInst, uint32_t _imm) :
ArmFaultVals<HypervisorCall>(_machInst, _imm)
{}
ExceptionClass
HypervisorCall::ec(ThreadContext *tc) const
{
return from64 ? EC_HVC_64 : vals.ec;
}
ExceptionClass
HypervisorTrap::ec(ThreadContext *tc) const
{

4
src/arch/arm/faults.hh
View file

@ -1,5 +1,5 @@
/*
* Copyright (c) 2010, 2012-2013 ARM Limited
* Copyright (c) 2010, 2012-2013, 2016 ARM Limited
* All rights reserved
*
* The license below extends only to copyright in the software and shall
@ -352,6 +352,8 @@ class HypervisorCall : public ArmFaultVals<HypervisorCall>
{
public:
HypervisorCall(ExtMachInst _machInst, uint32_t _imm);
ExceptionClass ec(ThreadContext *tc) const;
};
class HypervisorTrap : public ArmFaultVals<HypervisorTrap>

4
src/arch/arm/isa/formats/aarch64.isa
View file

@ -1,4 +1,4 @@
// Copyright (c) 2011-2015 ARM Limited
// Copyright (c) 2011-2016 ARM Limited
// All rights reserved
//
// The license below extends only to copyright in the software and shall
@ -250,7 +250,7 @@ namespace Aarch64
case 0x01:
return new Svc64(machInst);
case 0x02:
return new FailUnimplemented("hvc", machInst);
return new Hvc64(machInst);
case 0x03:
return new Smc64(machInst);
case 0x04:

20
src/arch/arm/isa/insts/misc64.isa
View file

@ -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;