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git.proxmox.com Git - mirror_edk2.git/blob - ArmVirtPkg/Library/XenArmGenericTimerVirtCounterLib/XenArmGenericTimerVirtCounterLib.c
3 Copyright (c) 2011 - 2014, ARM Ltd. All rights reserved.<BR>
4 Copyright (c) 2014 - 2018, Linaro Ltd. All rights reserved.<BR>
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
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.
16 #include <Library/ArmGenericTimerCounterLib.h>
17 #include <Library/ArmLib.h>
21 ArmGenericTimerEnableTimer (
27 TimerCtrlReg
= ArmReadCntvCtl ();
28 TimerCtrlReg
|= ARM_ARCH_TIMER_ENABLE
;
29 ArmWriteCntvCtl (TimerCtrlReg
);
34 ArmGenericTimerReenableTimer (
40 TimerCtrlReg
= ArmReadCntvCtl ();
41 TimerCtrlReg
|= ARM_ARCH_TIMER_ENABLE
;
44 // When running under Xen, we need to unmask the interrupt on the timer side
45 // as Xen will mask it when servicing the interrupt at the hypervisor level
46 // and delivering the virtual timer interrupt to the guest. Otherwise, the
47 // interrupt will fire again, trapping into the hypervisor again, etc. etc.
49 TimerCtrlReg
&= ~ARM_ARCH_TIMER_IMASK
;
50 ArmWriteCntvCtl (TimerCtrlReg
);
55 ArmGenericTimerDisableTimer (
61 TimerCtrlReg
= ArmReadCntvCtl ();
62 TimerCtrlReg
&= ~ARM_ARCH_TIMER_ENABLE
;
63 ArmWriteCntvCtl (TimerCtrlReg
);
68 ArmGenericTimerSetTimerFreq (
72 ArmWriteCntFrq (FreqInHz
);
77 ArmGenericTimerGetTimerFreq (
81 return ArmReadCntFrq ();
86 ArmGenericTimerGetTimerVal (
90 return ArmReadCntvTval ();
96 ArmGenericTimerSetTimerVal (
100 ArmWriteCntvTval (Value
);
105 ArmGenericTimerGetSystemCount (
109 return ArmReadCntvCt ();
114 ArmGenericTimerGetTimerCtrlReg (
118 return ArmReadCntvCtl ();
123 ArmGenericTimerSetTimerCtrlReg (
127 ArmWriteCntvCtl (Value
);
132 ArmGenericTimerGetCompareVal (
136 return ArmReadCntvCval ();
141 ArmGenericTimerSetCompareVal (
145 ArmWriteCntvCval (Value
);