ArmPkg: add ArmGenericTimerCounterLib implementation using virtual timer

This adds an implementation of ArmGenericTimerCounterLib using the virtual
architected generic timer.

Contributed-under: TianoCore Contribution Agreement 1.0
Acked-by: Laszlo Ersek <lersek@redhat.com>
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Olivier Martin <olivier.martin@arm.com>



git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@16076 6f19259b-4bc3-4df7-8a09-765794883524

ArmPkg/ArmPkg.dsc

@@ -125,6 +125,7 @@
   ArmPkg/Drivers/TimerDxe/TimerDxe.inf
 
   ArmPkg/Library/ArmGenericTimerPhyCounterLib/ArmGenericTimerPhyCounterLib.inf
+  ArmPkg/Library/ArmGenericTimerVirtCounterLib/ArmGenericTimerVirtCounterLib.inf
 
   ArmPkg/Library/ArmSmcLib/ArmSmcLib.inf
   ArmPkg/Library/ArmSmcLibNull/ArmSmcLibNull.inf

ArmPkg/Library/ArmGenericTimerVirtCounterLib/ArmGenericTimerVirtCounterLib.c

@@ -0,0 +1,149 @@
+/** @file
+
+  Copyright (c) 2011 - 2014, ARM Ltd. All rights reserved.<BR>
+  Copyright (c) 2014, Linaro Ltd. All rights reserved.<BR>
+
+  This program and the accompanying materials
+  are licensed and made available under the terms and conditions of the BSD License
+  which accompanies this distribution.  The full text of the license may be found at
+  http://opensource.org/licenses/bsd-license.php
+
+  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+
+**/
+
+#include <Library/ArmGenericTimerCounterLib.h>
+#include <Library/ArmArchTimer.h>
+
+VOID
+EFIAPI
+ArmGenericTimerEnableTimer (
+  VOID
+  )
+{
+  UINTN TimerCtrlReg;
+
+  ArmArchTimerReadReg (CntvCtl, (VOID *)&TimerCtrlReg);
+  TimerCtrlReg |= ARM_ARCH_TIMER_ENABLE;
+
+  //
+  // When running under KVM, we need to unmask the interrupt on the timer side
+  // as KVM will mask it when servicing the interrupt at the hypervisor level
+  // and delivering the virtual timer interrupt to the guest. Otherwise, the
+  // interrupt will fire again, trapping into the hypervisor again, etc. etc.
+  // This is scheduled to be fixed on the KVM side, but there is no harm in
+  // leaving this in once KVM gets fixed.
+  //
+  TimerCtrlReg &= ~ARM_ARCH_TIMER_IMASK;
+  ArmArchTimerWriteReg (CntvCtl, (VOID *)&TimerCtrlReg);
+}
+
+VOID
+EFIAPI
+ArmGenericTimerDisableTimer (
+  VOID
+  )
+{
+  UINTN TimerCtrlReg;
+
+  ArmArchTimerReadReg (CntvCtl, (VOID *)&TimerCtrlReg);
+  TimerCtrlReg &= ~ARM_ARCH_TIMER_ENABLE;
+  ArmArchTimerWriteReg (CntvCtl, (VOID *)&TimerCtrlReg);
+}
+
+VOID
+EFIAPI
+ArmGenericTimerSetTimerFreq (
+  IN   UINTN  FreqInHz
+  )
+{
+  ArmArchTimerWriteReg (CntFrq, (VOID *)&FreqInHz);
+}
+
+UINTN
+EFIAPI
+ArmGenericTimerGetTimerFreq (
+  VOID
+  )
+{
+  UINTN ArchTimerFreq = 0;
+  ArmArchTimerReadReg (CntFrq, (VOID *)&ArchTimerFreq);
+  return ArchTimerFreq;
+}
+
+UINTN
+EFIAPI
+ArmGenericTimerGetTimerVal (
+  VOID
+  )
+{
+  UINTN ArchTimerValue;
+  ArmArchTimerReadReg (CntvTval, (VOID *)&ArchTimerValue);
+
+  return ArchTimerValue;
+}
+
+
+VOID
+EFIAPI
+ArmGenericTimerSetTimerVal (
+  IN   UINTN   Value
+  )
+{
+  ArmArchTimerWriteReg (CntvTval, (VOID *)&Value);
+}
+
+UINT64
+EFIAPI
+ArmGenericTimerGetSystemCount (
+  VOID
+  )
+{
+  UINT64 SystemCount;
+  ArmArchTimerReadReg (CntvCt, (VOID *)&SystemCount);
+
+  return SystemCount;
+}
+
+UINTN
+EFIAPI
+ArmGenericTimerGetTimerCtrlReg (
+  VOID
+  )
+{
+  UINTN  Value;
+  ArmArchTimerReadReg (CntvCtl, (VOID *)&Value);
+
+  return Value;
+}
+
+VOID
+EFIAPI
+ArmGenericTimerSetTimerCtrlReg (
+  UINTN Value
+  )
+{
+  ArmArchTimerWriteReg (CntvCtl, (VOID *)&Value);
+}
+
+UINT64
+EFIAPI
+ArmGenericTimerGetCompareVal (
+  VOID
+  )
+{
+  UINT64  Value;
+  ArmArchTimerReadReg (CntvCval, (VOID *)&Value);
+
+  return Value;
+}
+
+VOID
+EFIAPI
+ArmGenericTimerSetCompareVal (
+  IN   UINT64   Value
+  )
+{
+  ArmArchTimerWriteReg (CntvCval, (VOID *)&Value);
+}

ArmPkg/Library/ArmGenericTimerVirtCounterLib/ArmGenericTimerVirtCounterLib.inf

@@ -0,0 +1,33 @@
+#/** @file
+#  Implement ArmGenericTimerCounterLib using the virtual timer
+#
+#  Copyright (c) 2014, Linaro Ltd. All rights reserved.<BR>
+#
+#  This program and the accompanying materials
+#  are licensed and made available under the terms and conditions of the BSD License
+#  which accompanies this distribution. The full text of the license may be found at
+#  http://opensource.org/licenses/bsd-license.php
+#  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+#  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+#
+#
+#**/
+
+[Defines]
+  INF_VERSION                    = 0x00010005
+  BASE_NAME                      = ArmGenericTimerVirtCounterLib
+  FILE_GUID                      = 3C0D77CC-4F27-49C8-B25C-2D01D81ED4D8
+  MODULE_TYPE                    = BASE
+  VERSION_STRING                 = 1.0
+  LIBRARY_CLASS                  = ArmGenericTimerCounterLib
+
+[Sources]
+  ArmGenericTimerVirtCounterLib.c
+
+[Packages]
+  MdePkg/MdePkg.dec
+  ArmPkg/ArmPkg.dec
+
+[LibraryClasses]
+  ArmLib
+  BaseLib