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/ArmArchTimer.h>
  18
  19 VOID
  20 EFIAPI
  21 ArmGenericTimerEnableTimer (
  22   VOID
  23   )
  24 {
  25   UINTN TimerCtrlReg;
  26
  27   ArmArchTimerReadReg (CntvCtl, (VOID *)&TimerCtrlReg);
  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   ArmArchTimerWriteReg (CntvCtl, (VOID *)&TimerCtrlReg);
  40 }
  41
  42 VOID
  43 EFIAPI
  44 ArmGenericTimerDisableTimer (
  45   VOID
  46   )
  47 {
  48   UINTN TimerCtrlReg;
  49
  50   ArmArchTimerReadReg (CntvCtl, (VOID *)&TimerCtrlReg);
  51   TimerCtrlReg &= ~ARM_ARCH_TIMER_ENABLE;
  52   ArmArchTimerWriteReg (CntvCtl, (VOID *)&TimerCtrlReg);
  53 }
  54
  55 VOID
  56 EFIAPI
  57 ArmGenericTimerSetTimerFreq (
  58   IN   UINTN  FreqInHz
  59   )
  60 {
  61   ArmArchTimerWriteReg (CntFrq, (VOID *)&FreqInHz);
  62 }
  63
  64 UINTN
  65 EFIAPI
  66 ArmGenericTimerGetTimerFreq (
  67   VOID
  68   )
  69 {
  70   UINTN ArchTimerFreq = 0;
  71   ArmArchTimerReadReg (CntFrq, (VOID *)&ArchTimerFreq);
  72   return ArchTimerFreq;
  73 }
  74
  75 UINTN
  76 EFIAPI
  77 ArmGenericTimerGetTimerVal (
  78   VOID
  79   )
  80 {
  81   UINTN ArchTimerValue;
  82   ArmArchTimerReadReg (CntvTval, (VOID *)&ArchTimerValue);
  83
  84   return ArchTimerValue;
  85 }
  86
  87
  88 VOID
  89 EFIAPI
  90 ArmGenericTimerSetTimerVal (
  91   IN   UINTN   Value
  92   )
  93 {
  94   ArmArchTimerWriteReg (CntvTval, (VOID *)&Value);
  95 }
  96
  97 UINT64
  98 EFIAPI
  99 ArmGenericTimerGetSystemCount (
 100   VOID
 101   )
 102 {
 103   UINT64 SystemCount;
 104   ArmArchTimerReadReg (CntvCt, (VOID *)&SystemCount);
 105
 106   return SystemCount;
 107 }
 108
 109 UINTN
 110 EFIAPI
 111 ArmGenericTimerGetTimerCtrlReg (
 112   VOID
 113   )
 114 {
 115   UINTN  Value;
 116   ArmArchTimerReadReg (CntvCtl, (VOID *)&Value);
 117
 118   return Value;
 119 }
 120
 121 VOID
 122 EFIAPI
 123 ArmGenericTimerSetTimerCtrlReg (
 124   UINTN Value
 125   )
 126 {
 127   ArmArchTimerWriteReg (CntvCtl, (VOID *)&Value);
 128 }
 129
 130 UINT64
 131 EFIAPI
 132 ArmGenericTimerGetCompareVal (
 133   VOID
 134   )
 135 {
 136   UINT64  Value;
 137   ArmArchTimerReadReg (CntvCval, (VOID *)&Value);
 138
 139   return Value;
 140 }
 141
 142 VOID
 143 EFIAPI
 144 ArmGenericTimerSetCompareVal (
 145   IN   UINT64   Value
 146   )
 147 {
 148   ArmArchTimerWriteReg (CntvCval, (VOID *)&Value);
 149 }