ArmPkg/Library/ArmGenericTimerVirtCounterLib/ArmGenericTimerVirtCounterLib.c

   1 /** @file
   2
   3   Copyright (c) 2011 - 2014, ARM Ltd. All rights reserved.<BR>
   4   Copyright (c) 2014, Linaro Ltd. All rights reserved.<BR>
   5
   6   This program and the accompanying materials
   7   are licensed and made available under the terms and conditions of the BSD License
   8   which accompanies this distribution.  The full text of the license may be found at
   9   http://opensource.org/licenses/bsd-license.php
  10
  11   THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  12   WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  13
  14 **/
  15
  16 #include <Library/ArmGenericTimerCounterLib.h>
  17 #include <Library/ArmLib.h>
  18
  19 VOID
  20 EFIAPI
  21 ArmGenericTimerEnableTimer (
  22   VOID
  23   )
  24 {
  25   UINTN TimerCtrlReg;
  26
  27   TimerCtrlReg = ArmReadCntvCtl ();
  28   TimerCtrlReg |= ARM_ARCH_TIMER_ENABLE;
  29
  30   //
  31   // When running under KVM, we need to unmask the interrupt on the timer side
  32   // as KVM will mask it when servicing the interrupt at the hypervisor level
  33   // and delivering the virtual timer interrupt to the guest. Otherwise, the
  34   // interrupt will fire again, trapping into the hypervisor again, etc. etc.
  35   // This is scheduled to be fixed on the KVM side, but there is no harm in
  36   // leaving this in once KVM gets fixed.
  37   //
  38   TimerCtrlReg &= ~ARM_ARCH_TIMER_IMASK;
  39   ArmWriteCntvCtl (TimerCtrlReg);
  40 }
  41
  42 VOID
  43 EFIAPI
  44 ArmGenericTimerDisableTimer (
  45   VOID
  46   )
  47 {
  48   UINTN TimerCtrlReg;
  49
  50   TimerCtrlReg = ArmReadCntvCtl ();
  51   TimerCtrlReg &= ~ARM_ARCH_TIMER_ENABLE;
  52   ArmWriteCntvCtl (TimerCtrlReg);
  53 }
  54
  55 VOID
  56 EFIAPI
  57 ArmGenericTimerSetTimerFreq (
  58   IN   UINTN  FreqInHz
  59   )
  60 {
  61   ArmWriteCntFrq (FreqInHz);
  62 }
  63
  64 UINTN
  65 EFIAPI
  66 ArmGenericTimerGetTimerFreq (
  67   VOID
  68   )
  69 {
  70   return ArmReadCntFrq ();
  71 }
  72
  73 UINTN
  74 EFIAPI
  75 ArmGenericTimerGetTimerVal (
  76   VOID
  77   )
  78 {
  79   return ArmReadCntvTval ();
  80 }
  81
  82
  83 VOID
  84 EFIAPI
  85 ArmGenericTimerSetTimerVal (
  86   IN   UINTN   Value
  87   )
  88 {
  89   ArmWriteCntvTval (Value);
  90 }
  91
  92 UINT64
  93 EFIAPI
  94 ArmGenericTimerGetSystemCount (
  95   VOID
  96   )
  97 {
  98   return ArmReadCntvCt ();
  99 }
 100
 101 UINTN
 102 EFIAPI
 103 ArmGenericTimerGetTimerCtrlReg (
 104   VOID
 105   )
 106 {
 107   return ArmReadCntvCtl ();
 108 }
 109
 110 VOID
 111 EFIAPI
 112 ArmGenericTimerSetTimerCtrlReg (
 113   UINTN Value
 114   )
 115 {
 116   ArmWriteCntvCtl (Value);
 117 }
 118
 119 UINT64
 120 EFIAPI
 121 ArmGenericTimerGetCompareVal (
 122   VOID
 123   )
 124 {
 125   return ArmReadCntvCval ();
 126 }
 127
 128 VOID
 129 EFIAPI
 130 ArmGenericTimerSetCompareVal (
 131   IN   UINT64   Value
 132   )
 133 {
 134   ArmWriteCntvCval (Value);
 135 }