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ArmPkg: Add ARM Architectural Timer support 

ARM Architectural Timer support is defined by the ARM Generic Timer Specification.



git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@12455 6f19259b-4bc3-4df7-8a09-765794883524
This commit is contained in:
oliviermartin 2011-09-27 16:35:16 +00:00
parent 0c0e7ef451
commit da9675a241
15 changed files with 1468 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
ArmPkg/ArmPkg.dec
View File

@ -133,3 +133,10 @@
# The Linux ATAGs are expected to be under 0x4000 (16KB) from the beginning of the System Memory # The Linux ATAGs are expected to be under 0x4000 (16KB) from the beginning of the System Memory
gArmTokenSpaceGuid.PcdArmLinuxAtagMaxOffset|0x4000|UINT32|0x00000020 gArmTokenSpaceGuid.PcdArmLinuxAtagMaxOffset|0x4000|UINT32|0x00000020
#
# ARM Architectural Timer
#
gArmTokenSpaceGuid.PcdArmArchTimerFreqInHz|0|UINT32|0x00000034
# ARM Architectural Timer Interrupt(GIC PPI) number
gArmTokenSpaceGuid.PcdArmArchTimerSecIntrNum|29|UINT32|0x00000035
gArmTokenSpaceGuid.PcdArmArchTimerIntrNum|30|UINT32|0x00000036

379
ArmPkg/Drivers/TimerDxe/TimerDxe.c Normal file
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@ -0,0 +1,379 @@
/** @file
Timer Architecture Protocol driver of the ARM flavor
Copyright (c) 2011 ARM 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 <PiDxe.h>
#include <Library/BaseLib.h>
#include <Library/DebugLib.h>
#include <Library/BaseMemoryLib.h>
#include <Library/UefiBootServicesTableLib.h>
#include <Library/UefiLib.h>
#include <Library/PcdLib.h>
#include <Library/IoLib.h>
#include <Library/ArmV7ArchTimerLib.h>
#include <Protocol/Timer.h>
#include <Protocol/HardwareInterrupt.h>
// The notification function to call on every timer interrupt.
EFI_TIMER_NOTIFY mTimerNotifyFunction = (EFI_TIMER_NOTIFY)NULL;
EFI_EVENT EfiExitBootServicesEvent = (EFI_EVENT)NULL;
// The current period of the timer interrupt
UINT64 mTimerPeriod = 0;
// Cached copy of the Hardware Interrupt protocol instance
EFI_HARDWARE_INTERRUPT_PROTOCOL *gInterrupt = NULL;
/**
This function registers the handler NotifyFunction so it is called every time
the timer interrupt fires. It also passes the amount of time since the last
handler call to the NotifyFunction. If NotifyFunction is NULL, then the
handler is unregistered. If the handler is registered, then EFI_SUCCESS is
returned. If the CPU does not support registering a timer interrupt handler,
then EFI_UNSUPPORTED is returned. If an attempt is made to register a handler
when a handler is already registered, then EFI_ALREADY_STARTED is returned.
If an attempt is made to unregister a handler when a handler is not registered,
then EFI_INVALID_PARAMETER is returned. If an error occurs attempting to
register the NotifyFunction with the timer interrupt, then EFI_DEVICE_ERROR
is returned.
@param This The EFI_TIMER_ARCH_PROTOCOL instance.
@param NotifyFunction The function to call when a timer interrupt fires. This
function executes at TPL_HIGH_LEVEL. The DXE Core will
register a handler for the timer interrupt, so it can know
how much time has passed. This information is used to
signal timer based events. NULL will unregister the handler.
@retval EFI_SUCCESS The timer handler was registered.
@retval EFI_UNSUPPORTED The platform does not support timer interrupts.
@retval EFI_ALREADY_STARTED NotifyFunction is not NULL, and a handler is already
registered.
@retval EFI_INVALID_PARAMETER NotifyFunction is NULL, and a handler was not
previously registered.
@retval EFI_DEVICE_ERROR The timer handler could not be registered.
**/
EFI_STATUS
EFIAPI
TimerDriverRegisterHandler (
IN EFI_TIMER_ARCH_PROTOCOL *This,
IN EFI_TIMER_NOTIFY NotifyFunction
)
{
if ((NotifyFunction == NULL) && (mTimerNotifyFunction == NULL)) {
return EFI_INVALID_PARAMETER;
}
if ((NotifyFunction != NULL) && (mTimerNotifyFunction != NULL)) {
return EFI_ALREADY_STARTED;
}
mTimerNotifyFunction = NotifyFunction;
return EFI_SUCCESS;
}
/**
Disable the timer
**/
VOID
EFIAPI
ExitBootServicesEvent (
IN EFI_EVENT Event,
IN VOID *Context
)
{
ArmArchTimerDisableTimer ();
}
/**
This function adjusts the period of timer interrupts to the value specified
by TimerPeriod. If the timer period is updated, then the selected timer
period is stored in EFI_TIMER.TimerPeriod, and EFI_SUCCESS is returned. If
the timer hardware is not programmable, then EFI_UNSUPPORTED is returned.
If an error occurs while attempting to update the timer period, then the
timer hardware will be put back in its state prior to this call, and
EFI_DEVICE_ERROR is returned. If TimerPeriod is 0, then the timer interrupt
is disabled. This is not the same as disabling the CPU's interrupts.
Instead, it must either turn off the timer hardware, or it must adjust the
interrupt controller so that a CPU interrupt is not generated when the timer
interrupt fires.
@param This The EFI_TIMER_ARCH_PROTOCOL instance.
@param TimerPeriod The rate to program the timer interrupt in 100 nS units. If
the timer hardware is not programmable, then EFI_UNSUPPORTED is
returned. If the timer is programmable, then the timer period
will be rounded up to the nearest timer period that is supported
by the timer hardware. If TimerPeriod is set to 0, then the
timer interrupts will be disabled.
@retval EFI_SUCCESS The timer period was changed.
@retval EFI_UNSUPPORTED The platform cannot change the period of the timer interrupt.
@retval EFI_DEVICE_ERROR The timer period could not be changed due to a device error.
**/
EFI_STATUS
EFIAPI
TimerDriverSetTimerPeriod (
IN EFI_TIMER_ARCH_PROTOCOL *This,
IN UINT64 TimerPeriod
)
{
UINT64 TimerTicks;
// always disable the timer
ArmArchTimerDisableTimer ();
if (TimerPeriod != 0) {
// Convert TimerPeriod to micro sec units
TimerTicks = DivU64x32 (TimerPeriod, 10);
TimerTicks = MultU64x32 (TimerPeriod, (PcdGet32(PcdArmArchTimerFreqInHz)/1000000));
ArmArchTimerSetTimerVal((UINTN)TimerTicks);
// Enable the timer
ArmArchTimerEnableTimer ();
}
// Save the new timer period
mTimerPeriod = TimerPeriod;
return EFI_SUCCESS;
}
/**
This function retrieves the period of timer interrupts in 100 ns units,
returns that value in TimerPeriod, and returns EFI_SUCCESS. If TimerPeriod
is NULL, then EFI_INVALID_PARAMETER is returned. If a TimerPeriod of 0 is
returned, then the timer is currently disabled.
@param This The EFI_TIMER_ARCH_PROTOCOL instance.
@param TimerPeriod A pointer to the timer period to retrieve in 100 ns units. If
0 is returned, then the timer is currently disabled.
@retval EFI_SUCCESS The timer period was returned in TimerPeriod.
@retval EFI_INVALID_PARAMETER TimerPeriod is NULL.
**/
EFI_STATUS
EFIAPI
TimerDriverGetTimerPeriod (
IN EFI_TIMER_ARCH_PROTOCOL *This,
OUT UINT64 *TimerPeriod
)
{
if (TimerPeriod == NULL) {
return EFI_INVALID_PARAMETER;
}
*TimerPeriod = mTimerPeriod;
return EFI_SUCCESS;
}
/**
This function generates a soft timer interrupt. If the platform does not support soft
timer interrupts, then EFI_UNSUPPORTED is returned. Otherwise, EFI_SUCCESS is returned.
If a handler has been registered through the EFI_TIMER_ARCH_PROTOCOL.RegisterHandler()
service, then a soft timer interrupt will be generated. If the timer interrupt is
enabled when this service is called, then the registered handler will be invoked. The
registered handler should not be able to distinguish a hardware-generated timer
interrupt from a software-generated timer interrupt.
@param This The EFI_TIMER_ARCH_PROTOCOL instance.
@retval EFI_SUCCESS The soft timer interrupt was generated.
@retval EFI_UNSUPPORTED The platform does not support the generation of soft timer interrupts.
**/
EFI_STATUS
EFIAPI
TimerDriverGenerateSoftInterrupt (
IN EFI_TIMER_ARCH_PROTOCOL *This
)
{
return EFI_UNSUPPORTED;
}
/**
Interface structure for the Timer Architectural Protocol.
@par Protocol Description:
This protocol provides the services to initialize a periodic timer
interrupt, and to register a handler that is called each time the timer
interrupt fires. It may also provide a service to adjust the rate of the
periodic timer interrupt. When a timer interrupt occurs, the handler is
passed the amount of time that has passed since the previous timer
interrupt.
@param RegisterHandler
Registers a handler that will be called each time the
timer interrupt fires. TimerPeriod defines the minimum
time between timer interrupts, so TimerPeriod will also
be the minimum time between calls to the registered
handler.
@param SetTimerPeriod
Sets the period of the timer interrupt in 100 nS units.
This function is optional, and may return EFI_UNSUPPORTED.
If this function is supported, then the timer period will
be rounded up to the nearest supported timer period.
@param GetTimerPeriod
Retrieves the period of the timer interrupt in 100 nS units.
@param GenerateSoftInterrupt
Generates a soft timer interrupt that simulates the firing of
the timer interrupt. This service can be used to invoke the registered handler if the timer interrupt has been masked for
a period of time.
**/
EFI_TIMER_ARCH_PROTOCOL gTimer = {
TimerDriverRegisterHandler,
TimerDriverSetTimerPeriod,
TimerDriverGetTimerPeriod,
TimerDriverGenerateSoftInterrupt
};
/**
C Interrupt Handler called in the interrupt context when Source interrupt is active.
@param Source Source of the interrupt. Hardware routing off a specific platform defines
what source means.
@param SystemContext Pointer to system register context. Mostly used by debuggers and will
update the system context after the return from the interrupt if
modified. Don't change these values unless you know what you are doing
**/
VOID
EFIAPI
TimerInterruptHandler (
IN HARDWARE_INTERRUPT_SOURCE Source,
IN EFI_SYSTEM_CONTEXT SystemContext
)
{
EFI_TPL OriginalTPL;
//
// DXE core uses this callback for the EFI timer tick. The DXE core uses locks
// that raise to TPL_HIGH and then restore back to current level. Thus we need
// to make sure TPL level is set to TPL_HIGH while we are handling the timer tick.
//
OriginalTPL = gBS->RaiseTPL (TPL_HIGH_LEVEL);
// Check if the timer interrupt is active
if ((ArmArchTimerGetTimerCtrlReg () ) & ARM_ARCH_TIMER_ISTATUS) {
// Signal end of interrupt early to help avoid losing subsequent ticks from long duration handlers
gInterrupt->EndOfInterrupt (gInterrupt, Source);
if (mTimerNotifyFunction) {
mTimerNotifyFunction (mTimerPeriod);
}
// Reload the Timer
TimerDriverSetTimerPeriod (&gTimer, FixedPcdGet32(PcdTimerPeriod));
}
// Enable timer interrupts
gInterrupt->EnableInterruptSource (gInterrupt, Source);
gBS->RestoreTPL (OriginalTPL);
}
/**
Initialize the state information for the Timer Architectural Protocol and
the Timer Debug support protocol that allows the debugger to break into a
running program.
@param ImageHandle of the loaded driver
@param SystemTable Pointer to the System Table
@retval EFI_SUCCESS Protocol registered
@retval EFI_OUT_OF_RESOURCES Cannot allocate protocol data structure
@retval EFI_DEVICE_ERROR Hardware problems
**/
EFI_STATUS
EFIAPI
TimerInitialize (
IN EFI_HANDLE ImageHandle,
IN EFI_SYSTEM_TABLE *SystemTable
)
{
EFI_HANDLE Handle = NULL;
EFI_STATUS Status;
UINTN TimerCtrlReg;
if (ArmIsArchTimerImplemented () == 0) {
DEBUG ((EFI_D_ERROR, "ARM Architectural Timer is not available in the CPU, hence cann't use this Driver \n"));
ASSERT (0);
}
// Find the interrupt controller protocol. ASSERT if not found.
Status = gBS->LocateProtocol (&gHardwareInterruptProtocolGuid, NULL, (VOID **)&gInterrupt);
ASSERT_EFI_ERROR (Status);
// Disable the timer
Status = TimerDriverSetTimerPeriod (&gTimer, 0);
ASSERT_EFI_ERROR (Status);
// Install secure and Non-secure interrupt handlers
// Note: Because it is not possible to determine the security state of the
// CPU dynamically, we just install interrupt handler for both sec and non-sec
// timer PPI
Status = gInterrupt->RegisterInterruptSource (gInterrupt, PcdGet32 (PcdArmArchTimerSecIntrNum), TimerInterruptHandler);
ASSERT_EFI_ERROR (Status);
Status = gInterrupt->RegisterInterruptSource (gInterrupt, PcdGet32 (PcdArmArchTimerIntrNum), TimerInterruptHandler);
ASSERT_EFI_ERROR (Status);
// Unmask timer interrupts
TimerCtrlReg = ArmArchTimerGetTimerCtrlReg ();
TimerCtrlReg &= ~ARM_ARCH_TIMER_IMASK;
ArmArchTimerSetTimerCtrlReg (TimerCtrlReg);
// Set up default timer
Status = TimerDriverSetTimerPeriod (&gTimer, FixedPcdGet32(PcdTimerPeriod)); // TIMER_DEFAULT_PERIOD
ASSERT_EFI_ERROR (Status);
// Install the Timer Architectural Protocol onto a new handle
Status = gBS->InstallMultipleProtocolInterfaces(
&Handle,
&gEfiTimerArchProtocolGuid, &gTimer,
NULL
);
ASSERT_EFI_ERROR(Status);
// enable Secure timer interrupts
Status = gInterrupt->EnableInterruptSource (gInterrupt, PcdGet32 (PcdArmArchTimerSecIntrNum));
// enable NonSecure timer interrupts
Status = gInterrupt->EnableInterruptSource (gInterrupt, PcdGet32 (PcdArmArchTimerIntrNum));
// Register for an ExitBootServicesEvent
Status = gBS->CreateEvent (EVT_SIGNAL_EXIT_BOOT_SERVICES, TPL_NOTIFY, ExitBootServicesEvent, NULL, &EfiExitBootServicesEvent);
ASSERT_EFI_ERROR (Status);
return Status;
}

59
ArmPkg/Drivers/TimerDxe/TimerDxe.inf Normal file
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@ -0,0 +1,59 @@
#/** @file
#
# Component discription file for Timer DXE module
#
# Copyright (c) 2009 - 2010, Apple Inc. 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 = ArmTimerDxe
FILE_GUID = 49ea041e-6752-42ca-b0b1-7344fe2546b7
MODULE_TYPE = DXE_DRIVER
VERSION_STRING = 1.0
ENTRY_POINT = TimerInitialize
[Sources.common]
TimerDxe.c
[Packages]
MdePkg/MdePkg.dec
EmbeddedPkg/EmbeddedPkg.dec
ArmPkg/ArmPkg.dec
ArmPlatformPkg/ArmPlatformPkg.dec
[LibraryClasses]
ArmLib
BaseLib
UefiRuntimeServicesTableLib
UefiLib
UefiBootServicesTableLib
BaseMemoryLib
DebugLib
UefiDriverEntryPoint
IoLib
[Guids]
[Protocols]
gEfiTimerArchProtocolGuid
gHardwareInterruptProtocolGuid
[Pcd.common]
gEmbeddedTokenSpaceGuid.PcdTimerPeriod
gArmTokenSpaceGuid.PcdArmArchTimerSecIntrNum
gArmTokenSpaceGuid.PcdArmArchTimerIntrNum
gArmTokenSpaceGuid.PcdArmArchTimerFreqInHz
[Depex]
gHardwareInterruptProtocolGuid

7
ArmPkg/Include/Chipset/ArmV7.h
View File

@ -17,6 +17,7 @@
#define __ARM_V7_H__ #define __ARM_V7_H__
#include <Chipset/ArmV7Mmu.h> #include <Chipset/ArmV7Mmu.h>
#include <Chipset/ArmV7ArchTimer.h>
// Domain Access Control Register // Domain Access Control Register
#define DOMAIN_ACCESS_CONTROL_MASK(a) (3UL << (2 * (a))) #define DOMAIN_ACCESS_CONTROL_MASK(a) (3UL << (2 * (a)))
@ -80,6 +81,12 @@ ArmWriteTpidrurw (
UINTN Value UINTN Value
); );
UINTN
EFIAPI
ArmIsArchTimerImplemented (
VOID
);
UINTN UINTN
EFIAPI EFIAPI
ArmReadIdPfr1 ( ArmReadIdPfr1 (

138
ArmPkg/Include/Chipset/ArmV7ArchTimer.h Normal file
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@ -0,0 +1,138 @@
/** @file
*
* Copyright (c) 2011, ARM Limited. All rights reserved.
*
* 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.
*
**/
#ifndef __ARMV7_ARCH_TIMER_H_
#define __ARMV7_ARCH_TIMER_H_
UINTN
EFIAPI
ArmReadCntFrq (
VOID
);
VOID
EFIAPI
ArmWriteCntFrq (
UINTN FreqInHz
);
UINT64
EFIAPI
ArmReadCntPct (
VOID
);
UINTN
EFIAPI
ArmReadCntkCtl (
VOID
);
VOID
EFIAPI
ArmWriteCntkCtl (
UINTN Val
);
UINTN
EFIAPI
ArmReadCntpTval (
VOID
);
VOID
EFIAPI
ArmWriteCntpTval (
UINTN Val
);
UINTN
EFIAPI
ArmReadCntpCtl (
VOID
);
VOID
EFIAPI
ArmWriteCntpCtl (
UINTN Val
);
UINTN
EFIAPI
ArmReadCntvTval (
VOID
);
VOID
EFIAPI
ArmWriteCntvTval (
UINTN Val
);
UINTN
EFIAPI
ArmReadCntvCtl (
VOID
);
VOID
EFIAPI
ArmWriteCntvCtl (
UINTN Val
);
UINT64
EFIAPI
ArmReadCntvCt (
VOID
);
UINT64
EFIAPI
ArmReadCntpCval (
VOID
);
VOID
EFIAPI
ArmWriteCntpCval (
UINT64 Val
);
UINT64
EFIAPI
ArmReadCntvCval (
VOID
);
VOID
EFIAPI
ArmWriteCntvCval (
UINT64 Val
);
UINT64
EFIAPI
ArmReadCntvOff (
VOID
);
VOID
EFIAPI
ArmWriteCntvOff (
UINT64 Val
);
#endif

2
ArmPkg/Include/Library/ArmLib.h
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@ -167,7 +167,7 @@ Cp15CacheInfo (
BOOLEAN BOOLEAN
EFIAPI EFIAPI
ArmIsMPCore ( ArmIsMpCore (
VOID VOID
); );

115
ArmPkg/Include/Library/ArmV7ArchTimerLib.h Normal file
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@ -0,0 +1,115 @@
/** @file
Copyright (c) 2011, ARM 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.
**/
#ifndef __ARM_V7_ARCH_TIMER_LIB_H__
#define __ARM_V7_ARCH_TIMER_LIB_H__
#define ARM_ARCH_TIMER_ENABLE (1 << 0)
#define ARM_ARCH_TIMER_IMASK (1 << 1)
#define ARM_ARCH_TIMER_ISTATUS (1 << 2)
typedef enum {
CntFrq = 0,
CntPct,
CntkCtl,
CntpTval,
CntpCtl,
CntvTval,
CntvCtl,
CntvCt,
CntpCval,
CntvCval,
CntvOff,
CnthCtl,
CnthpTval,
CnthpCtl,
CnthpCval,
RegMaximum
}ARM_ARCH_TIMER_REGS;
VOID
EFIAPI
ArmArchTimerReadReg (
IN ARM_ARCH_TIMER_REGS Reg,
OUT VOID *DstBuf
);
VOID
EFIAPI
ArmArchTimerWriteReg (
IN ARM_ARCH_TIMER_REGS Reg,
IN VOID *SrcBuf
);
VOID
EFIAPI
ArmArchTimerEnableTimer (
VOID
);
VOID
EFIAPI
ArmArchTimerDisableTimer (
VOID
);
VOID
EFIAPI
ArmArchTimerSetTimerFreq (
IN UINTN FreqInHz
);
UINTN
EFIAPI
ArmArchTimerGetTimerFreq (
VOID
);
VOID
EFIAPI
ArmArchTimerSetTimerVal (
IN UINTN Val
);
UINTN
EFIAPI
ArmArchTimerGetTimerVal (
VOID
);
UINT64
EFIAPI
ArmArchTimerGetSystemCount (
VOID
);
UINTN
EFIAPI
ArmArchTimerGetTimerCtrlReg (
VOID
);
VOID
EFIAPI
ArmArchTimerSetTimerCtrlReg (
UINTN Val
);
VOID
EFIAPI
ArmArchTimerSetCompareVal (
IN UINT64 Val
);
#endif // __ARM_V7_ARCH_TIMER_LIB_H__

191
ArmPkg/Library/ArmArchTimerLib/ArmArchTimerLib.c Normal file
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@ -0,0 +1,191 @@
/** @file
Generic ARM implementation of TimerLib.h
Copyright (c) 2011, ARM Limited. All rights reserved.
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 <Base.h>
#include <Library/BaseLib.h>
#include <Library/TimerLib.h>
#include <Library/DebugLib.h>
#include <Library/PcdLib.h>
#include <Library/ArmV7ArchTimerLib.h>
#include <Chipset/ArmV7.h>
#define TICKS_PER_MICRO_SEC (PcdGet32 (PcdArmArchTimerFreqInHz)/1000000U)
RETURN_STATUS
EFIAPI
ArmArchTimerLibConstructor (
VOID
)
{
// Check if the ARM Generic Timer Extension is implemented
if (ArmIsArchTimerImplemented ()) {
UINTN TimerFreq;
// Check if Architectural Timer frequency is valid number (should not be 0)
ASSERT (PcdGet32 (PcdArmArchTimerFreqInHz));
// Check if ticks/uS is not 0. The Architectural timer runs at constant
// frequency irrespective of CPU frequency. According to General Timer Ref
// manual lower bound of the frequency is in the range of 1-10MHz
ASSERT (TICKS_PER_MICRO_SEC);
// If the security extensions are not implemented set Timer Frequency
if ((ArmReadIdPfr1 () & 0xF0)) {
ArmArchTimerSetTimerFreq (PcdGet32 (PcdArmArchTimerFreqInHz));
}
// Architectural Timer Frequency must be set in the Secure privileged(if secure extensions are supported) mode.
// If the reset value (0) is returned just ASSERT.
TimerFreq = ArmArchTimerGetTimerFreq ();
ASSERT (TimerFreq);
} else {
DEBUG ((EFI_D_ERROR, "ARM Architectural Timer is not available in the CPU, Hence cann't use this library \n"));
ASSERT (0);
}
return RETURN_SUCCESS;
}
/**
Stalls the CPU for the number of microseconds specified by MicroSeconds.
@param MicroSeconds The minimum number of microseconds to delay.
@return The value of MicroSeconds inputted.
**/
UINTN
EFIAPI
MicroSecondDelay (
IN UINTN MicroSeconds
)
{
UINT64 TimerTicks64;
UINT64 SystemCounterVal;
// Calculate counter ticks that can represent requsted delay
TimerTicks64 = MultU64x32 (MicroSeconds, TICKS_PER_MICRO_SEC);
// Read System Counter value
SystemCounterVal = ArmArchTimerGetSystemCount ();
TimerTicks64 += SystemCounterVal;
// Wait until delay count is expired.
while (SystemCounterVal < TimerTicks64) {
SystemCounterVal = ArmArchTimerGetSystemCount ();
}
return MicroSeconds;
}
/**
Stalls the CPU for at least the given number of nanoseconds.
Stalls the CPU for the number of nanoseconds specified by NanoSeconds.
When the timer frequency is 1MHz, each tick corresponds to 1 microsecond.
Therefore, the nanosecond delay will be rounded up to the nearest 1 microsecond.
@param NanoSeconds The minimum number of nanoseconds to delay.
@return The value of NanoSeconds inputted.
**/
UINTN
EFIAPI
NanoSecondDelay (
IN UINTN NanoSeconds
)
{
UINTN MicroSeconds;
// Round up to 1us Tick Number
MicroSeconds = NanoSeconds / 1000;
MicroSeconds += ((NanoSeconds % 1000) == 0) ? 0 : 1;
MicroSecondDelay (MicroSeconds);
return NanoSeconds;
}
/**
Retrieves the current value of a 64-bit free running performance counter.
The counter can either count up by 1 or count down by 1. If the physical
performance counter counts by a larger increment, then the counter values
must be translated. The properties of the counter can be retrieved from
GetPerformanceCounterProperties().
@return The current value of the free running performance counter.
**/
UINT64
EFIAPI
GetPerformanceCounter (
VOID
)
{
// Just return the value of system count
return ArmArchTimerGetSystemCount ();
}
/**
Retrieves the 64-bit frequency in Hz and the range of performance counter
values.
If StartValue is not NULL, then the value that the performance counter starts
with immediately after is it rolls over is returned in StartValue. If
EndValue is not NULL, then the value that the performance counter end with
immediately before it rolls over is returned in EndValue. The 64-bit
frequency of the performance counter in Hz is always returned. If StartValue
is less than EndValue, then the performance counter counts up. If StartValue
is greater than EndValue, then the performance counter counts down. For
example, a 64-bit free running counter that counts up would have a StartValue
of 0 and an EndValue of 0xFFFFFFFFFFFFFFFF. A 24-bit free running counter
that counts down would have a StartValue of 0xFFFFFF and an EndValue of 0.
@param StartValue The value the performance counter starts with when it
rolls over.
@param EndValue The value that the performance counter ends with before
it rolls over.
@return The frequency in Hz.
**/
UINT64
EFIAPI
GetPerformanceCounterProperties (
OUT UINT64 *StartValue, OPTIONAL
OUT UINT64 *EndValue OPTIONAL
)
{
if (StartValue != NULL) {
// Timer starts with the reload value
*StartValue = (UINT64)0ULL ;
}
if (EndValue != NULL) {
// Timer counts down to 0x0
*EndValue = 0xFFFFFFFFFFFFFFFF;;
}
return (UINT64)ArmArchTimerGetTimerFreq ();
}

46
ArmPkg/Library/ArmArchTimerLib/ArmArchTimerLib.inf Normal file
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@ -0,0 +1,46 @@
#/** @file
#
# Copyright (c) 2011, ARM Limited. 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 = ArmArchTimerLib
FILE_GUID = 82da1b44-d2d6-4a7d-bbf0-a0cb67964034
MODULE_TYPE = BASE
VERSION_STRING = 1.0
LIBRARY_CLASS = TimerLib
CONSTRUCTOR = ArmArchTimerLibConstructor
[Sources.common]
ArmArchTimerLib.c
[Packages]
MdePkg/MdePkg.dec
EmbeddedPkg/EmbeddedPkg.dec
ArmPkg/ArmPkg.dec
[LibraryClasses]
DebugLib
IoLib
ArmLib
BaseLib
[Protocols]
[Guids]
[Pcd]
gArmTokenSpaceGuid.PcdArmArchTimerFreqInHz
[Depex]
gEfiCpuArchProtocolGuid

275
ArmPkg/Library/ArmLib/ArmV7/ArmV7ArchTimer.c Normal file
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@ -0,0 +1,275 @@
/** @file
*
* Copyright (c) 2011, ARM Limited. All rights reserved.
*
* 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 <Uefi.h>
#include <Chipset/ArmV7.h>
#include <Library/BaseMemoryLib.h>
#include <Library/MemoryAllocationLib.h>
#include <Library/ArmLib.h>
#include <Library/BaseLib.h>
#include <Library/DebugLib.h>
#include "ArmV7Lib.h"
#include "ArmLibPrivate.h"
#include <Library/ArmV7ArchTimerLib.h>
VOID
EFIAPI
ArmArchTimerReadReg (
IN ARM_ARCH_TIMER_REGS Reg,
OUT VOID *DstBuf
)
{
// Check if the Generic/Architecture timer is implemented
if (ArmIsArchTimerImplemented ()) {
switch (Reg) {
case CntFrq:
*((UINTN *)DstBuf) = ArmReadCntFrq ();
break;
case CntPct:
*((UINT64 *)DstBuf) = ArmReadCntPct ();
break;
case CntkCtl:
*((UINTN *)DstBuf) = ArmReadCntkCtl();
break;
case CntpTval:
*((UINTN *)DstBuf) = ArmReadCntpTval ();
break;
case CntpCtl:
*((UINTN *)DstBuf) = ArmReadCntpCtl ();
break;
case CntvTval:
*((UINTN *)DstBuf) = ArmReadCntvTval ();
break;
case CntvCtl:
*((UINTN *)DstBuf) = ArmReadCntvCtl ();
break;
case CntvCt:
*((UINT64 *)DstBuf) = ArmReadCntvCt ();
break;
case CntpCval:
*((UINT64 *)DstBuf) = ArmReadCntpCval ();
break;
case CntvCval:
*((UINT64 *)DstBuf) = ArmReadCntvCval ();
break;
case CntvOff:
*((UINT64 *)DstBuf) = ArmReadCntvOff ();
break;
case CnthCtl:
case CnthpTval:
case CnthpCtl:
case CnthpCval:
DEBUG ((EFI_D_ERROR, "The register is related to Hyperviser Mode. Can't perform requested operation\n "));
break;
default:
DEBUG ((EFI_D_ERROR, "Unknown ARM Generic Timer register %x. \n ", Reg));
}
} else {
DEBUG ((EFI_D_ERROR, "Attempt to read ARM Generic Timer registers. But ARM Generic Timer extension is not implemented \n "));
ASSERT (0);
}
}
VOID
EFIAPI
ArmArchTimerWriteReg (
IN ARM_ARCH_TIMER_REGS Reg,
IN VOID *SrcBuf
)
{
// Check if the Generic/Architecture timer is implemented
if (ArmIsArchTimerImplemented ()) {
switch (Reg) {
case CntFrq:
ArmWriteCntFrq (*((UINTN *)SrcBuf));
break;
case CntPct:
DEBUG ((EFI_D_ERROR, "Can't write to Read Only Register: CNTPCT \n"));
break;
case CntkCtl:
ArmWriteCntkCtl (*((UINTN *)SrcBuf));
break;
case CntpTval:
ArmWriteCntpTval (*((UINTN *)SrcBuf));
break;
case CntpCtl:
ArmWriteCntpCtl (*((UINTN *)SrcBuf));
break;
case CntvTval:
ArmWriteCntvTval (*((UINTN *)SrcBuf));
break;
case CntvCtl:
ArmWriteCntvCtl (*((UINTN *)SrcBuf));
break;
case CntvCt:
DEBUG ((EFI_D_ERROR, "Can't write to Read Only Register: CNTVCT \n"));
break;
case CntpCval:
ArmWriteCntpCval (*((UINT64 *)SrcBuf) );
break;
case CntvCval:
ArmWriteCntvCval (*((UINT64 *)SrcBuf) );
break;
case CntvOff:
ArmWriteCntvOff (*((UINT64 *)SrcBuf));
break;
case CnthCtl:
case CnthpTval:
case CnthpCtl:
case CnthpCval:
DEBUG ((EFI_D_ERROR, "The register is related to Hypervisor Mode. Can't perform requested operation\n "));
break;
default:
DEBUG ((EFI_D_ERROR, "Unknown ARM Generic Timer register %x. \n ", Reg));
}
} else {
DEBUG ((EFI_D_ERROR, "Attempt to write to ARM Generic Timer registers. But ARM Generic Timer extension is not implemented \n "));
ASSERT (0);
}
}
VOID
EFIAPI
ArmArchTimerEnableTimer (
VOID
)
{
UINTN TimerCtrlReg;
ArmArchTimerReadReg (CntpCtl, (VOID *)&TimerCtrlReg);
TimerCtrlReg |= ARM_ARCH_TIMER_ENABLE;
ArmArchTimerWriteReg (CntpCtl, (VOID *)&TimerCtrlReg);
}
VOID
EFIAPI
ArmArchTimerDisableTimer (
VOID
)
{
UINTN TimerCtrlReg;
ArmArchTimerReadReg (CntpCtl, (VOID *)&TimerCtrlReg);
TimerCtrlReg &= ~ARM_ARCH_TIMER_ENABLE;
ArmArchTimerWriteReg (CntpCtl, (VOID *)&TimerCtrlReg);
}
VOID
EFIAPI
ArmArchTimerSetTimerFreq (
IN UINTN FreqInHz
)
{
ArmArchTimerWriteReg (CntFrq, (VOID *)&FreqInHz);
}
UINTN
EFIAPI
ArmArchTimerGetTimerFreq (
VOID
)
{
UINTN ArchTimerFreq = 0;
ArmArchTimerReadReg (CntFrq, (VOID *)&ArchTimerFreq);
return ArchTimerFreq;
}
UINTN
EFIAPI
ArmArchTimerGetTimerVal (
VOID
)
{
UINTN ArchTimerVal;
ArmArchTimerReadReg (CntpTval, (VOID *)&ArchTimerVal);
return ArchTimerVal;
}
VOID
EFIAPI
ArmArchTimerSetTimerVal (
IN UINTN Val
)
{
ArmArchTimerWriteReg (CntpTval, (VOID *)&Val);
}
UINT64
EFIAPI
ArmArchTimerGetSystemCount (
VOID
)
{
UINT64 SystemCount;
ArmArchTimerReadReg (CntPct, (VOID *)&SystemCount);
return SystemCount;
}
UINTN
EFIAPI
ArmArchTimerGetTimerCtrlReg (
VOID
)
{
UINTN Val;
ArmArchTimerReadReg (CntpCtl, (VOID *)&Val);
return Val;
}
VOID
EFIAPI
ArmArchTimerSetTimerCtrlReg (
UINTN Val
)
{
ArmArchTimerWriteReg (CntpCtl, (VOID *)&Val);
}
VOID
EFIAPI
ArmArchTimerSetCompareVal (
IN UINT64 Val
)
{
ArmArchTimerWriteReg (CntpCval, (VOID *)&Val);
}

119
ArmPkg/Library/ArmLib/ArmV7/ArmV7ArchTimerSupport.S Normal file
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@ -0,0 +1,119 @@
#------------------------------------------------------------------------------
#
# Copyright (c) 2011, ARM Limited. All rights reserved.
#
# 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.
#
#------------------------------------------------------------------------------
.text
.align 2
GCC_ASM_EXPORT (ArmReadCntFrq)
GCC_ASM_EXPORT (ArmWriteCntFrq)
GCC_ASM_EXPORT (ArmReadCntPct)
GCC_ASM_EXPORT (ArmReadCntkCtl)
GCC_ASM_EXPORT (ArmWriteCntkCtl)
GCC_ASM_EXPORT (ArmReadCntpTval)
GCC_ASM_EXPORT (ArmWriteCntpTval)
GCC_ASM_EXPORT (ArmReadCntpCtl)
GCC_ASM_EXPORT (ArmWriteCntpCtl)
GCC_ASM_EXPORT (ArmReadCntvTval)
GCC_ASM_EXPORT (ArmWriteCntvTval)
GCC_ASM_EXPORT (ArmReadCntvCtl)
GCC_ASM_EXPORT (ArmWriteCntvCtl)
GCC_ASM_EXPORT (ArmReadCntvCt)
GCC_ASM_EXPORT (ArmReadCntpCval)
GCC_ASM_EXPORT (ArmWriteCntpCval)
GCC_ASM_EXPORT (ArmReadCntvCval)
GCC_ASM_EXPORT (ArmWriteCntvCval)
GCC_ASM_EXPORT (ArmReadCntvOff)
GCC_ASM_EXPORT (ArmWriteCntvOff)
ASM_PFX(ArmReadCntFrq):
mrc p15, 0, r0, c14, c0, 0 @ Read CNTFRQ
bx lr
ASM_PFX(ArmWriteCntFrq):
mcr p15, 0, r0, c14, c0, 0 @ Write to CNTFRQ
bx lr
ASM_PFX(ArmReadCntPct):
mrrc p15, 0, r0, r1, c14 @ Read CNTPT (Physical counter register)
bx lr
ASM_PFX(ArmReadCntkCtl):
mrc p15, 0, r0, c14, c1, 0 @ Read CNTK_CTL (Timer PL1 Control Register)
bx lr
ASM_PFX(ArmWriteCntkCtl):
mcr p15, 0, r0, c14, c1, 0 @ Write to CNTK_CTL (Timer PL1 Control Register)
bx lr
ASM_PFX(ArmReadCntpTval):
mrc p15, 0, r0, c14, c2, 0 @ Read CNTP_TVAL (PL1 physical timer value register)
bx lr
ASM_PFX(ArmWriteCntpTval):
mcr p15, 0, r0, c14, c2, 0 @ Write to CNTP_TVAL (PL1 physical timer value register)
bx lr
ASM_PFX(ArmReadCntpCtl):
mrc p15, 0, r0, c14, c2, 1 @ Read CNTP_CTL (PL1 Physical Timer Control Register)
bx lr
ASM_PFX(ArmWriteCntpCtl):
mcr p15, 0, r0, c14, c2, 1 @ Write to CNTP_CTL (PL1 Physical Timer Control Register)
bx lr
ASM_PFX(ArmReadCntvTval):
mrc p15, 0, r0, c14, c3, 0 @ Read CNTV_TVAL (Virtual Timer Value register)
bx lr
ASM_PFX(ArmWriteCntvTval):
mcr p15, 0, r0, c14, c3, 0 @ Write to CNTV_TVAL (Virtual Timer Value register)
bx lr
ASM_PFX(ArmReadCntvCtl):
mrc p15, 0, r0, c14, c3, 1 @ Read CNTV_CTL (Virtual Timer Control Register)
bx lr
ASM_PFX(ArmWriteCntvCtl):
mcr p15, 0, r0, c14, c3, 1 @ Write to CNTV_CTL (Virtual Timer Control Register)
bx lr
ASM_PFX(ArmReadCntvCt):
mrrc p15, 1, r0, r1, c14 @ Read CNTVCT (Virtual Count Register)
bx lr
ASM_PFX(ArmReadCntpCval):
mrrc p15, 2, r0, r1, c14 @ Read CNTP_CTVAL (Physical Timer Compare Value Register)
bx lr
ASM_PFX(ArmWriteCntpCval):
mcrr p15, 2, r0, r1, c14 @ Write to CNTP_CTVAL (Physical Timer Compare Value Register)
bx lr
ASM_PFX(ArmReadCntvCval):
mrrc p15, 3, r0, r1, c14 @ Read CNTV_CTVAL (Virtual Timer Compare Value Register)
bx lr
ASM_PFX(ArmWriteCntvCval):
mcrr p15, 3, r0, r1, c14 @ write to CNTV_CTVAL (Virtual Timer Compare Value Register)
bx lr
ASM_PFX(ArmReadCntvOff):
mrrc p15, 4, r0, r1, c14 @ Read CNTVOFF (virtual Offset register)
bx lr
ASM_PFX(ArmWriteCntvOff):
mcrr p15, 4, r0, r1, c14 @ Write to CNTVOFF (Virtual Offset register)
bx lr
ASM_FUNCTION_REMOVE_IF_UNREFERENCED

119
ArmPkg/Library/ArmLib/ArmV7/ArmV7ArchTimerSupport.asm Normal file
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@ -0,0 +1,119 @@
//------------------------------------------------------------------------------
//
// Copyright (c) 2011, ARM Limited. All rights reserved.
//
// 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.
//
//------------------------------------------------------------------------------
EXPORT ArmReadCntFrq
EXPORT ArmWriteCntFrq
EXPORT ArmReadCntPct
EXPORT ArmReadCntkCtl
EXPORT ArmWriteCntkCtl
EXPORT ArmReadCntpTval
EXPORT ArmWriteCntpTval
EXPORT ArmReadCntpCtl
EXPORT ArmWriteCntpCtl
EXPORT ArmReadCntvTval
EXPORT ArmWriteCntvTval
EXPORT ArmReadCntvCtl
EXPORT ArmWriteCntvCtl
EXPORT ArmReadCntvCt
EXPORT ArmReadCntpCval
EXPORT ArmWriteCntpCval
EXPORT ArmReadCntvCval
EXPORT ArmWriteCntvCval
EXPORT ArmReadCntvOff
EXPORT ArmWriteCntvOff
AREA ArmV7ArchTimerSupport, CODE, READONLY
PRESERVE8
ArmReadCntFrq
mrc p15, 0, r0, c14, c0, 0 ; Read CNTFRQ
bx lr
ArmWriteCntFrq
mcr p15, 0, r0, c14, c0, 0 ; Write to CNTFRQ
bx lr
ArmReadCntPct
mrrc p15, 0, r0, r1, c14 ; Read CNTPT (Physical counter register)
bx lr
ArmReadCntkCtl
mrc p15, 0, r0, c14, c1, 0 ; Read CNTK_CTL (Timer PL1 Control Register)
bx lr
ArmWriteCntkCtl
mcr p15, 0, r0, c14, c1, 0 ; Write to CNTK_CTL (Timer PL1 Control Register)
bx lr
ArmReadCntpTval
mrc p15, 0, r0, c14, c2, 0 ; Read CNTP_TVAL (PL1 physical timer value register)
bx lr
ArmWriteCntpTval
mcr p15, 0, r0, c14, c2, 0 ; Write to CNTP_TVAL (PL1 physical timer value register)
bx lr
ArmReadCntpCtl
mrc p15, 0, r0, c14, c2, 1 ; Read CNTP_CTL (PL1 Physical Timer Control Register)
bx lr
ArmWriteCntpCtl
mcr p15, 0, r0, c14, c2, 1 ; Write to CNTP_CTL (PL1 Physical Timer Control Register)
bx lr
ArmReadCntvTval
mrc p15, 0, r0, c14, c3, 0 ; Read CNTV_TVAL (Virtual Timer Value register)
bx lr
ArmWriteCntvTval
mcr p15, 0, r0, c14, c3, 0 ; Write to CNTV_TVAL (Virtual Timer Value register)
bx lr
ArmReadCntvCtl
mrc p15, 0, r0, c14, c3, 1 ; Read CNTV_CTL (Virtual Timer Control Register)
bx lr
ArmWriteCntvCtl
mcr p15, 0, r0, c14, c3, 1 ; Write to CNTV_CTL (Virtual Timer Control Register)
bx lr
ArmReadCntvCt
mrrc p15, 1, r0, r1, c14 ; Read CNTVCT (Virtual Count Register)
bx lr
ArmReadCntpCval
mrrc p15, 2, r0, r1, c14 ; Read CNTP_CTVAL (Physical Timer Compare Value Register)
bx lr
ArmWriteCntpCval
mcrr p15, 2, r0, r1, c14 ; Write to CNTP_CTVAL (Physical Timer Compare Value Register)
bx lr
ArmReadCntvCval
mrrc p15, 3, r0, r1, c14 ; Read CNTV_CTVAL (Virtual Timer Compare Value Register)
bx lr
ArmWriteCntvCval
mcrr p15, 3, r0, r1, c14 ; write to CNTV_CTVAL (Virtual Timer Compare Value Register)
bx lr
ArmReadCntvOff
mrrc p15, 4, r0, r1, c14 ; Read CNTVOFF (virtual Offset register)
bx lr
ArmWriteCntvOff
mcrr p15, 4, r0, r1, c14 ; Write to CNTVOFF (Virtual Offset register)
bx lr
END

4
ArmPkg/Library/ArmLib/ArmV7/ArmV7Lib.inf
View File

@ -35,6 +35,10 @@
ArmV7Lib.c ArmV7Lib.c
ArmV7Mmu.c ArmV7Mmu.c
ArmV7ArchTimer.c
ArmV7ArchTimerSupport.S | GCC
ArmV7ArchTimerSupport.asm | RVCT
[Packages] [Packages]
ArmPkg/ArmPkg.dec ArmPkg/ArmPkg.dec
MdePkg/MdePkg.dec MdePkg/MdePkg.dec

4
ArmPkg/Library/ArmLib/ArmV7/ArmV7LibPrePi.inf
View File

@ -35,6 +35,10 @@
ArmV7Lib.c ArmV7Lib.c
ArmV7Mmu.c ArmV7Mmu.c
ArmV7ArchTimer.c
ArmV7ArchTimerSupport.S | GCC
ArmV7ArchTimerSupport.asm | RVCT
[Packages] [Packages]
ArmPkg/ArmPkg.dec ArmPkg/ArmPkg.dec
MdePkg/MdePkg.dec MdePkg/MdePkg.dec

4
ArmPkg/Library/ArmLib/ArmV7/ArmV7LibSec.inf
View File

@ -32,6 +32,10 @@
ArmV7Lib.c ArmV7Lib.c
ArmV7ArchTimer.c
ArmV7ArchTimerSupport.S | GCC
ArmV7ArchTimerSupport.asm | RVCT
[Packages] [Packages]
ArmPkg/ArmPkg.dec ArmPkg/ArmPkg.dec
MdePkg/MdePkg.dec MdePkg/MdePkg.dec