REF: https://bugzilla.tianocore.org/show_bug.cgi?id=4076
This DXE module initializes the timer interrupt handler
and installs the Arch Timer protocol.
Cc: Eric Dong <eric.dong@intel.com>
Cc: Ray Ni <ray.ni@intel.com>
Cc: Rahul Kumar <rahul1.kumar@intel.com>
Cc: Daniel Schaefer <git@danielschaefer.me>
Signed-off-by: Sunil V L <sunilvl@ventanamicro.com>
---
UefiCpuPkg/UefiCpuPkg.dsc | 3 +
UefiCpuPkg/CpuTimerDxe/CpuTimerDxe.inf | 51 ++++
UefiCpuPkg/CpuTimerDxe/RiscV64/Timer.h | 177 ++++++++++++
UefiCpuPkg/CpuTimerDxe/RiscV64/Timer.c | 294 ++++++++++++++++++++
UefiCpuPkg/CpuTimerDxe/CpuTimer.uni | 14 +
UefiCpuPkg/CpuTimerDxe/CpuTimerExtra.uni | 12 +
6 files changed, 551 insertions(+)
diff --git a/UefiCpuPkg/UefiCpuPkg.dsc b/UefiCpuPkg/UefiCpuPkg.dsc
index 6ea90507e36f..54ef5edd6eae 100644
--- a/UefiCpuPkg/UefiCpuPkg.dsc
+++ b/UefiCpuPkg/UefiCpuPkg.dsc
@@ -178,5 +178,8 @@ [Components.IA32, Components.X64]
UefiCpuPkg/Library/SmmCpuRendezvousLib/SmmCpuRendezvousLib.inf
UefiCpuPkg/Library/CpuPageTableLib/CpuPageTableLib.inf
+[Components.RISCV64]
+ UefiCpuPkg/CpuTimerDxe/CpuTimerDxe.inf
+
[BuildOptions]
*_*_*_CC_FLAGS = -D DISABLE_NEW_DEPRECATED_INTERFACES
diff --git a/UefiCpuPkg/CpuTimerDxe/CpuTimerDxe.inf b/UefiCpuPkg/CpuTimerDxe/CpuTimerDxe.inf
new file mode 100644
index 000000000000..d7706328b591
--- /dev/null
+++ b/UefiCpuPkg/CpuTimerDxe/CpuTimerDxe.inf
@@ -0,0 +1,51 @@
+## @file
+# Timer Arch protocol module
+#
+# Copyright (c) 2019, Hewlett Packard Enterprise Development LP. All rights reserved.<BR>
+#
+# SPDX-License-Identifier: BSD-2-Clause-Patent
+#
+##
+
+[Defines]
+ INF_VERSION = 0x0001001b
+ BASE_NAME = CpuTimerDxe
+ MODULE_UNI_FILE = CpuTimer.uni
+ FILE_GUID = 055DDAC6-9142-4013-BF20-FC2E5BC325C9
+ MODULE_TYPE = DXE_DRIVER
+ VERSION_STRING = 1.0
+ ENTRY_POINT = TimerDriverInitialize
+#
+# The following information is for reference only and not required by the build
+# tools.
+#
+# VALID_ARCHITECTURES = RISCV64
+#
+[Packages]
+ MdePkg/MdePkg.dec
+ UefiCpuPkg/UefiCpuPkg.dec
+
+[LibraryClasses]
+ BaseLib
+ DebugLib
+ IoLib
+ CpuLib
+ UefiBootServicesTableLib
+ UefiDriverEntryPoint
+
+[LibraryClasses.RISCV64]
+ RiscVSbiLib
+
+[Sources.RISCV64]
+ RiscV64/Timer.h
+ RiscV64/Timer.c
+
+[Protocols]
+ gEfiCpuArchProtocolGuid ## CONSUMES
+ gEfiTimerArchProtocolGuid ## PRODUCES
+
+[Depex]
+ gEfiCpuArchProtocolGuid
+
+[UserExtensions.TianoCore."ExtraFiles"]
+ CpuTimerExtra.uni
diff --git a/UefiCpuPkg/CpuTimerDxe/RiscV64/Timer.h b/UefiCpuPkg/CpuTimerDxe/RiscV64/Timer.h
new file mode 100644
index 000000000000..586eb0cfadb4
--- /dev/null
+++ b/UefiCpuPkg/CpuTimerDxe/RiscV64/Timer.h
@@ -0,0 +1,177 @@
+/** @file
+ RISC-V Timer Architectural Protocol definitions
+
+ Copyright (c) 2019, Hewlett Packard Enterprise Development LP. All rights reserved.<BR>
+
+ SPDX-License-Identifier: BSD-2-Clause-Patent
+
+**/
+
+#ifndef TIMER_H_
+#define TIMER_H_
+
+#include <PiDxe.h>
+
+#include <Protocol/Cpu.h>
+#include <Protocol/Timer.h>
+
+#include <Library/UefiBootServicesTableLib.h>
+#include <Library/BaseLib.h>
+#include <Library/DebugLib.h>
+#include <Library/IoLib.h>
+
+//
+// RISC-V use 100us timer.
+// The default timer tick duration is set to 10 ms = 10 * 1000 * 10 100 ns units
+//
+#define DEFAULT_TIMER_TICK_DURATION 100000
+
+extern VOID
+RiscvSetTimerPeriod (
+ UINT32 TimerPeriod
+ );
+
+//
+// Function Prototypes
+//
+
+/**
+ Initialize the Timer Architectural Protocol driver
+
+ @param ImageHandle ImageHandle of the loaded driver
+ @param SystemTable Pointer to the System Table
+
+ @retval EFI_SUCCESS Timer Architectural Protocol created
+ @retval EFI_OUT_OF_RESOURCES Not enough resources available to initialize driver.
+ @retval EFI_DEVICE_ERROR A device error occured attempting to initialize the driver.
+
+**/
+EFI_STATUS
+EFIAPI
+TimerDriverInitialize (
+ IN EFI_HANDLE ImageHandle,
+ IN EFI_SYSTEM_TABLE *SystemTable
+ )
+;
+
+/**
+
+ 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 NotifyFunction 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
+TimerDriverRegisterHandler (
+ IN EFI_TIMER_ARCH_PROTOCOL *This,
+ IN EFI_TIMER_NOTIFY NotifyFunction
+ )
+;
+
+/**
+
+ 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
+ )
+;
+
+/**
+
+ 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
+ )
+;
+
+/**
+
+ 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_UNSUPPORTEDT The platform does not support the generation of soft timer interrupts.
+
+**/
+EFI_STATUS
+EFIAPI
+TimerDriverGenerateSoftInterrupt (
+ IN EFI_TIMER_ARCH_PROTOCOL *This
+ )
+;
+
+#endif
diff --git a/UefiCpuPkg/CpuTimerDxe/RiscV64/Timer.c b/UefiCpuPkg/CpuTimerDxe/RiscV64/Timer.c
new file mode 100644
index 000000000000..db153f715e60
--- /dev/null
+++ b/UefiCpuPkg/CpuTimerDxe/RiscV64/Timer.c
@@ -0,0 +1,294 @@
+/** @file
+ RISC-V Timer Architectural Protocol
+
+ Copyright (c) 2019, Hewlett Packard Enterprise Development LP. All rights reserved.<BR>
+
+ SPDX-License-Identifier: BSD-2-Clause-Patent
+
+**/
+
+#include <Library/BaseLib.h>
+#include <Library/BaseRiscVSbiLib.h>
+#include "Timer.h"
+
+//
+// The handle onto which the Timer Architectural Protocol will be installed
+//
+STATIC EFI_HANDLE mTimerHandle = NULL;
+
+//
+// The Timer Architectural Protocol that this driver produces
+//
+EFI_TIMER_ARCH_PROTOCOL mTimer = {
+ TimerDriverRegisterHandler,
+ TimerDriverSetTimerPeriod,
+ TimerDriverGetTimerPeriod,
+ TimerDriverGenerateSoftInterrupt
+};
+
+//
+// Pointer to the CPU Architectural Protocol instance
+//
+EFI_CPU_ARCH_PROTOCOL *mCpu;
+
+//
+// The notification function to call on every timer interrupt.
+// A bug in the compiler prevents us from initializing this here.
+//
+STATIC EFI_TIMER_NOTIFY mTimerNotifyFunction;
+
+//
+// The current period of the timer interrupt
+//
+STATIC UINT64 mTimerPeriod = 0;
+
+/**
+ Timer Interrupt Handler.
+
+ @param InterruptType The type of interrupt that occured
+ @param SystemContext A pointer to the system context when the interrupt occured
+**/
+VOID
+EFIAPI
+TimerInterruptHandler (
+ IN EFI_EXCEPTION_TYPE InterruptType,
+ IN EFI_SYSTEM_CONTEXT SystemContext
+ )
+{
+ EFI_TPL OriginalTPL;
+ UINT64 RiscvTimer;
+
+ OriginalTPL = gBS->RaiseTPL (TPL_HIGH_LEVEL);
+ if (mTimerNotifyFunction != NULL) {
+ mTimerNotifyFunction (mTimerPeriod);
+ }
+
+ RiscVDisableTimerInterrupt (); // Disable SMode timer int
+ RiscVClearPendingTimerInterrupt ();
+ if (mTimerPeriod == 0) {
+ gBS->RestoreTPL (OriginalTPL);
+ RiscVDisableTimerInterrupt (); // Disable SMode timer int
+ return;
+ }
+
+ RiscvTimer = RiscVReadTimer ();
+ SbiSetTimer (RiscvTimer += mTimerPeriod);
+ gBS->RestoreTPL (OriginalTPL);
+ RiscVEnableTimerInterrupt (); // enable SMode timer int
+}
+
+/**
+
+ 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
+ )
+{
+ DEBUG ((DEBUG_INFO, "TimerDriverRegisterHandler(0x%lx) called\n", NotifyFunction));
+ mTimerNotifyFunction = NotifyFunction;
+ return EFI_SUCCESS;
+}
+
+/**
+
+ 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 RiscvTimer;
+
+ DEBUG ((DEBUG_INFO, "TimerDriverSetTimerPeriod(0x%lx)\n", TimerPeriod));
+
+ if (TimerPeriod == 0) {
+ mTimerPeriod = 0;
+ RiscVDisableTimerInterrupt (); // Disable SMode timer int
+ return EFI_SUCCESS;
+ }
+
+ mTimerPeriod = TimerPeriod / 10; // convert unit from 100ns to 1us
+ RiscvTimer = RiscVReadTimer ();
+ SbiSetTimer (RiscvTimer + mTimerPeriod);
+
+ mCpu->EnableInterrupt (mCpu);
+ RiscVEnableTimerInterrupt (); // enable SMode timer int
+ 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
+ )
+{
+ *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_UNSUPPORTEDT The platform does not support the generation of soft timer interrupts.
+
+**/
+EFI_STATUS
+EFIAPI
+TimerDriverGenerateSoftInterrupt (
+ IN EFI_TIMER_ARCH_PROTOCOL *This
+ )
+{
+ return EFI_SUCCESS;
+}
+
+/**
+ Initialize the Timer Architectural Protocol driver
+
+ @param ImageHandle ImageHandle of the loaded driver
+ @param SystemTable Pointer to the System Table
+
+ @retval EFI_SUCCESS Timer Architectural Protocol created
+ @retval EFI_OUT_OF_RESOURCES Not enough resources available to initialize driver.
+ @retval EFI_DEVICE_ERROR A device error occured attempting to initialize the driver.
+
+**/
+EFI_STATUS
+EFIAPI
+TimerDriverInitialize (
+ IN EFI_HANDLE ImageHandle,
+ IN EFI_SYSTEM_TABLE *SystemTable
+ )
+{
+ EFI_STATUS Status;
+
+ //
+ // Initialize the pointer to our notify function.
+ //
+ mTimerNotifyFunction = NULL;
+
+ //
+ // Make sure the Timer Architectural Protocol is not already installed in the system
+ //
+ ASSERT_PROTOCOL_ALREADY_INSTALLED (NULL, &gEfiTimerArchProtocolGuid);
+
+ //
+ // Find the CPU architectural protocol.
+ //
+ Status = gBS->LocateProtocol (&gEfiCpuArchProtocolGuid, NULL, (VOID **)&mCpu);
+ ASSERT_EFI_ERROR (Status);
+
+ //
+ // Force the timer to be disabled
+ //
+ Status = TimerDriverSetTimerPeriod (&mTimer, 0);
+ ASSERT_EFI_ERROR (Status);
+
+ //
+ // Install interrupt handler for RISC-V Timer.
+ //
+ Status = mCpu->RegisterInterruptHandler (mCpu, EXCEPT_RISCV_TIMER_INT, TimerInterruptHandler);
+ ASSERT_EFI_ERROR (Status);
+
+ //
+ // Force the timer to be enabled at its default period
+ //
+ Status = TimerDriverSetTimerPeriod (&mTimer, DEFAULT_TIMER_TICK_DURATION);
+ ASSERT_EFI_ERROR (Status);
+
+ //
+ // Install the Timer Architectural Protocol onto a new handle
+ //
+ Status = gBS->InstallMultipleProtocolInterfaces (
+ &mTimerHandle,
+ &gEfiTimerArchProtocolGuid,
+ &mTimer,
+ NULL
+ );
+ ASSERT_EFI_ERROR (Status);
+ return Status;
+}
diff --git a/UefiCpuPkg/CpuTimerDxe/CpuTimer.uni b/UefiCpuPkg/CpuTimerDxe/CpuTimer.uni
new file mode 100644
index 000000000000..76de1f3f352a
--- /dev/null
+++ b/UefiCpuPkg/CpuTimerDxe/CpuTimer.uni
@@ -0,0 +1,14 @@
+// /** @file
+//
+// Timer Arch protocol strings.
+//
+// Copyright (c) 2016, Hewlett Packard Enterprise Development LP. All rights reserved.<BR>
+//
+// SPDX-License-Identifier: BSD-2-Clause-Patent
+//
+// **/
+
+
+#string STR_MODULE_ABSTRACT #language en-US "Timer driver that provides Timer Arch protocol"
+
+#string STR_MODULE_DESCRIPTION #language en-US "Timer driver that provides Timer Arch protocol."
diff --git a/UefiCpuPkg/CpuTimerDxe/CpuTimerExtra.uni b/UefiCpuPkg/CpuTimerDxe/CpuTimerExtra.uni
new file mode 100644
index 000000000000..ceb93a7ce82f
--- /dev/null
+++ b/UefiCpuPkg/CpuTimerDxe/CpuTimerExtra.uni
@@ -0,0 +1,12 @@
+// /** @file
+// Timer Localized Strings and Content
+//
+// Copyright (c) 2016, Hewlett Packard Enterprise Development LP. All rights reserved.<BR>
+//
+// SPDX-License-Identifier: BSD-2-Clause-Patent
+//
+// **/
+
+#string STR_PROPERTIES_MODULE_NAME
+#language en-US
+"Timer DXE Driver"
--
2.38.0
-=-=-=-=-=-=-=-=-=-=-=-
Groups.io Links: You receive all messages sent to this group.
View/Reply Online (#95233): https://edk2.groups.io/g/devel/message/95233
Mute This Topic: https://groups.io/mt/94330849/1787277
Group Owner: devel+owner@edk2.groups.io
Unsubscribe: https://edk2.groups.io/g/devel/unsub [importer@patchew.org]
-=-=-=-=-=-=-=-=-=-=-=-[AMD Official Use Only - General]
Acked-by: Abner Chang <abner.chang@amd.com>
Need maintainer's agreement.
Abner
> -----Original Message-----
> From: devel@edk2.groups.io <devel@edk2.groups.io> On Behalf Of Sunil V L
> via groups.io
> Sent: Saturday, October 15, 2022 12:48 AM
> To: devel@edk2.groups.io
> Cc: Eric Dong <eric.dong@intel.com>; Ray Ni <ray.ni@intel.com>; Rahul
> Kumar <rahul1.kumar@intel.com>; Daniel Schaefer
> <git@danielschaefer.me>
> Subject: [edk2-devel] [edk2-staging/RiscV64QemuVirt PATCH V4 20/34]
> UefiCpuPkg: Add CpuTimerDxe module
>
> Caution: This message originated from an External Source. Use proper
> caution when opening attachments, clicking links, or responding.
>
>
> REF:
> https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Fbugz
> illa.tianocore.org%2Fshow_bug.cgi%3Fid%3D4076&data=05%7C01%7Ca
> bner.chang%40amd.com%7Cb8b27a5b30864359da3408daae045448%7C3dd89
> 61fe4884e608e11a82d994e183d%7C0%7C0%7C638013630881288660%7CUnkn
> own%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik
> 1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=Tuh%2BRGCWd
> YvjFXMWH%2FfEYRBoND5OhLWWk2VHINqUhb4%3D&reserved=0
>
> This DXE module initializes the timer interrupt handler and installs the Arch
> Timer protocol.
>
> Cc: Eric Dong <eric.dong@intel.com>
> Cc: Ray Ni <ray.ni@intel.com>
> Cc: Rahul Kumar <rahul1.kumar@intel.com>
> Cc: Daniel Schaefer <git@danielschaefer.me>
> Signed-off-by: Sunil V L <sunilvl@ventanamicro.com>
> ---
> UefiCpuPkg/UefiCpuPkg.dsc | 3 +
> UefiCpuPkg/CpuTimerDxe/CpuTimerDxe.inf | 51 ++++
> UefiCpuPkg/CpuTimerDxe/RiscV64/Timer.h | 177 ++++++++++++
> UefiCpuPkg/CpuTimerDxe/RiscV64/Timer.c | 294 ++++++++++++++++++++
> UefiCpuPkg/CpuTimerDxe/CpuTimer.uni | 14 +
> UefiCpuPkg/CpuTimerDxe/CpuTimerExtra.uni | 12 +
> 6 files changed, 551 insertions(+)
>
> diff --git a/UefiCpuPkg/UefiCpuPkg.dsc b/UefiCpuPkg/UefiCpuPkg.dsc index
> 6ea90507e36f..54ef5edd6eae 100644
> --- a/UefiCpuPkg/UefiCpuPkg.dsc
> +++ b/UefiCpuPkg/UefiCpuPkg.dsc
> @@ -178,5 +178,8 @@ [Components.IA32, Components.X64]
> UefiCpuPkg/Library/SmmCpuRendezvousLib/SmmCpuRendezvousLib.inf
> UefiCpuPkg/Library/CpuPageTableLib/CpuPageTableLib.inf
>
> +[Components.RISCV64]
> + UefiCpuPkg/CpuTimerDxe/CpuTimerDxe.inf
> +
> [BuildOptions]
> *_*_*_CC_FLAGS = -D DISABLE_NEW_DEPRECATED_INTERFACES diff --git
> a/UefiCpuPkg/CpuTimerDxe/CpuTimerDxe.inf
> b/UefiCpuPkg/CpuTimerDxe/CpuTimerDxe.inf
> new file mode 100644
> index 000000000000..d7706328b591
> --- /dev/null
> +++ b/UefiCpuPkg/CpuTimerDxe/CpuTimerDxe.inf
> @@ -0,0 +1,51 @@
> +## @file
> +# Timer Arch protocol module
> +#
> +# Copyright (c) 2019, Hewlett Packard Enterprise Development LP. All
> +rights reserved.<BR> # # SPDX-License-Identifier: BSD-2-Clause-Patent #
> +##
> +
> +[Defines]
> + INF_VERSION = 0x0001001b
> + BASE_NAME = CpuTimerDxe
> + MODULE_UNI_FILE = CpuTimer.uni
> + FILE_GUID = 055DDAC6-9142-4013-BF20-FC2E5BC325C9
> + MODULE_TYPE = DXE_DRIVER
> + VERSION_STRING = 1.0
> + ENTRY_POINT = TimerDriverInitialize
> +#
> +# The following information is for reference only and not required by
> +the build # tools.
> +#
> +# VALID_ARCHITECTURES = RISCV64
> +#
> +[Packages]
> + MdePkg/MdePkg.dec
> + UefiCpuPkg/UefiCpuPkg.dec
> +
> +[LibraryClasses]
> + BaseLib
> + DebugLib
> + IoLib
> + CpuLib
> + UefiBootServicesTableLib
> + UefiDriverEntryPoint
> +
> +[LibraryClasses.RISCV64]
> + RiscVSbiLib
> +
> +[Sources.RISCV64]
> + RiscV64/Timer.h
> + RiscV64/Timer.c
> +
> +[Protocols]
> + gEfiCpuArchProtocolGuid ## CONSUMES
> + gEfiTimerArchProtocolGuid ## PRODUCES
> +
> +[Depex]
> + gEfiCpuArchProtocolGuid
> +
> +[UserExtensions.TianoCore."ExtraFiles"]
> + CpuTimerExtra.uni
> diff --git a/UefiCpuPkg/CpuTimerDxe/RiscV64/Timer.h
> b/UefiCpuPkg/CpuTimerDxe/RiscV64/Timer.h
> new file mode 100644
> index 000000000000..586eb0cfadb4
> --- /dev/null
> +++ b/UefiCpuPkg/CpuTimerDxe/RiscV64/Timer.h
> @@ -0,0 +1,177 @@
> +/** @file
> + RISC-V Timer Architectural Protocol definitions
> +
> + Copyright (c) 2019, Hewlett Packard Enterprise Development LP. All
> + rights reserved.<BR>
> +
> + SPDX-License-Identifier: BSD-2-Clause-Patent
> +
> +**/
> +
> +#ifndef TIMER_H_
> +#define TIMER_H_
> +
> +#include <PiDxe.h>
> +
> +#include <Protocol/Cpu.h>
> +#include <Protocol/Timer.h>
> +
> +#include <Library/UefiBootServicesTableLib.h>
> +#include <Library/BaseLib.h>
> +#include <Library/DebugLib.h>
> +#include <Library/IoLib.h>
> +
> +//
> +// RISC-V use 100us timer.
> +// The default timer tick duration is set to 10 ms = 10 * 1000 * 10 100
> +ns units // #define DEFAULT_TIMER_TICK_DURATION 100000
> +
> +extern VOID
> +RiscvSetTimerPeriod (
> + UINT32 TimerPeriod
> + );
> +
> +//
> +// Function Prototypes
> +//
> +
> +/**
> + Initialize the Timer Architectural Protocol driver
> +
> + @param ImageHandle ImageHandle of the loaded driver
> + @param SystemTable Pointer to the System Table
> +
> + @retval EFI_SUCCESS Timer Architectural Protocol created
> + @retval EFI_OUT_OF_RESOURCES Not enough resources available to
> initialize driver.
> + @retval EFI_DEVICE_ERROR A device error occured attempting to
> initialize the driver.
> +
> +**/
> +EFI_STATUS
> +EFIAPI
> +TimerDriverInitialize (
> + IN EFI_HANDLE ImageHandle,
> + IN EFI_SYSTEM_TABLE *SystemTable
> + )
> +;
> +
> +/**
> +
> + 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 NotifyFunction 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
> +TimerDriverRegisterHandler (
> + IN EFI_TIMER_ARCH_PROTOCOL *This,
> + IN EFI_TIMER_NOTIFY NotifyFunction
> + )
> +;
> +
> +/**
> +
> + 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
> + )
> +;
> +
> +/**
> +
> + 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
> + )
> +;
> +
> +/**
> +
> + 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_UNSUPPORTEDT The platform does not support the
> generation of soft timer interrupts.
> +
> +**/
> +EFI_STATUS
> +EFIAPI
> +TimerDriverGenerateSoftInterrupt (
> + IN EFI_TIMER_ARCH_PROTOCOL *This
> + )
> +;
> +
> +#endif
> diff --git a/UefiCpuPkg/CpuTimerDxe/RiscV64/Timer.c
> b/UefiCpuPkg/CpuTimerDxe/RiscV64/Timer.c
> new file mode 100644
> index 000000000000..db153f715e60
> --- /dev/null
> +++ b/UefiCpuPkg/CpuTimerDxe/RiscV64/Timer.c
> @@ -0,0 +1,294 @@
> +/** @file
> + RISC-V Timer Architectural Protocol
> +
> + Copyright (c) 2019, Hewlett Packard Enterprise Development LP. All
> + rights reserved.<BR>
> +
> + SPDX-License-Identifier: BSD-2-Clause-Patent
> +
> +**/
> +
> +#include <Library/BaseLib.h>
> +#include <Library/BaseRiscVSbiLib.h>
> +#include "Timer.h"
> +
> +//
> +// The handle onto which the Timer Architectural Protocol will be
> +installed // STATIC EFI_HANDLE mTimerHandle = NULL;
> +
> +//
> +// The Timer Architectural Protocol that this driver produces //
> +EFI_TIMER_ARCH_PROTOCOL mTimer = {
> + TimerDriverRegisterHandler,
> + TimerDriverSetTimerPeriod,
> + TimerDriverGetTimerPeriod,
> + TimerDriverGenerateSoftInterrupt
> +};
> +
> +//
> +// Pointer to the CPU Architectural Protocol instance //
> +EFI_CPU_ARCH_PROTOCOL *mCpu;
> +
> +//
> +// The notification function to call on every timer interrupt.
> +// A bug in the compiler prevents us from initializing this here.
> +//
> +STATIC EFI_TIMER_NOTIFY mTimerNotifyFunction;
> +
> +//
> +// The current period of the timer interrupt // STATIC UINT64
> +mTimerPeriod = 0;
> +
> +/**
> + Timer Interrupt Handler.
> +
> + @param InterruptType The type of interrupt that occured
> + @param SystemContext A pointer to the system context when the
> interrupt occured
> +**/
> +VOID
> +EFIAPI
> +TimerInterruptHandler (
> + IN EFI_EXCEPTION_TYPE InterruptType,
> + IN EFI_SYSTEM_CONTEXT SystemContext
> + )
> +{
> + EFI_TPL OriginalTPL;
> + UINT64 RiscvTimer;
> +
> + OriginalTPL = gBS->RaiseTPL (TPL_HIGH_LEVEL); if
> + (mTimerNotifyFunction != NULL) {
> + mTimerNotifyFunction (mTimerPeriod); }
> +
> + RiscVDisableTimerInterrupt (); // Disable SMode timer int
> + RiscVClearPendingTimerInterrupt (); if (mTimerPeriod == 0) {
> + gBS->RestoreTPL (OriginalTPL);
> + RiscVDisableTimerInterrupt (); // Disable SMode timer int
> + return;
> + }
> +
> + RiscvTimer = RiscVReadTimer ();
> + SbiSetTimer (RiscvTimer += mTimerPeriod);
> + gBS->RestoreTPL (OriginalTPL);
> + RiscVEnableTimerInterrupt (); // enable SMode timer int }
> +
> +/**
> +
> + 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
> + )
> +{
> + DEBUG ((DEBUG_INFO, "TimerDriverRegisterHandler(0x%lx) called\n",
> +NotifyFunction));
> + mTimerNotifyFunction = NotifyFunction;
> + return EFI_SUCCESS;
> +}
> +
> +/**
> +
> + 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 RiscvTimer;
> +
> + DEBUG ((DEBUG_INFO, "TimerDriverSetTimerPeriod(0x%lx)\n",
> + TimerPeriod));
> +
> + if (TimerPeriod == 0) {
> + mTimerPeriod = 0;
> + RiscVDisableTimerInterrupt (); // Disable SMode timer int
> + return EFI_SUCCESS;
> + }
> +
> + mTimerPeriod = TimerPeriod / 10; // convert unit from 100ns to 1us
> + RiscvTimer = RiscVReadTimer ();
> + SbiSetTimer (RiscvTimer + mTimerPeriod);
> +
> + mCpu->EnableInterrupt (mCpu);
> + RiscVEnableTimerInterrupt (); // enable SMode timer int
> + 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
> + )
> +{
> + *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_UNSUPPORTEDT The platform does not support the
> generation of soft timer interrupts.
> +
> +**/
> +EFI_STATUS
> +EFIAPI
> +TimerDriverGenerateSoftInterrupt (
> + IN EFI_TIMER_ARCH_PROTOCOL *This
> + )
> +{
> + return EFI_SUCCESS;
> +}
> +
> +/**
> + Initialize the Timer Architectural Protocol driver
> +
> + @param ImageHandle ImageHandle of the loaded driver
> + @param SystemTable Pointer to the System Table
> +
> + @retval EFI_SUCCESS Timer Architectural Protocol created
> + @retval EFI_OUT_OF_RESOURCES Not enough resources available to
> initialize driver.
> + @retval EFI_DEVICE_ERROR A device error occured attempting to
> initialize the driver.
> +
> +**/
> +EFI_STATUS
> +EFIAPI
> +TimerDriverInitialize (
> + IN EFI_HANDLE ImageHandle,
> + IN EFI_SYSTEM_TABLE *SystemTable
> + )
> +{
> + EFI_STATUS Status;
> +
> + //
> + // Initialize the pointer to our notify function.
> + //
> + mTimerNotifyFunction = NULL;
> +
> + //
> + // Make sure the Timer Architectural Protocol is not already
> + installed in the system // ASSERT_PROTOCOL_ALREADY_INSTALLED (NULL,
> + &gEfiTimerArchProtocolGuid);
> +
> + //
> + // Find the CPU architectural protocol.
> + //
> + Status = gBS->LocateProtocol (&gEfiCpuArchProtocolGuid, NULL, (VOID
> + **)&mCpu); ASSERT_EFI_ERROR (Status);
> +
> + //
> + // Force the timer to be disabled
> + //
> + Status = TimerDriverSetTimerPeriod (&mTimer, 0); ASSERT_EFI_ERROR
> + (Status);
> +
> + //
> + // Install interrupt handler for RISC-V Timer.
> + //
> + Status = mCpu->RegisterInterruptHandler (mCpu,
> + EXCEPT_RISCV_TIMER_INT, TimerInterruptHandler); ASSERT_EFI_ERROR
> + (Status);
> +
> + //
> + // Force the timer to be enabled at its default period // Status =
> + TimerDriverSetTimerPeriod (&mTimer, DEFAULT_TIMER_TICK_DURATION);
> + ASSERT_EFI_ERROR (Status);
> +
> + //
> + // Install the Timer Architectural Protocol onto a new handle
> + //
> + Status = gBS->InstallMultipleProtocolInterfaces (
> + &mTimerHandle,
> + &gEfiTimerArchProtocolGuid,
> + &mTimer,
> + NULL
> + );
> + ASSERT_EFI_ERROR (Status);
> + return Status;
> +}
> diff --git a/UefiCpuPkg/CpuTimerDxe/CpuTimer.uni
> b/UefiCpuPkg/CpuTimerDxe/CpuTimer.uni
> new file mode 100644
> index 000000000000..76de1f3f352a
> --- /dev/null
> +++ b/UefiCpuPkg/CpuTimerDxe/CpuTimer.uni
> @@ -0,0 +1,14 @@
> +// /** @file
> +//
> +// Timer Arch protocol strings.
> +//
> +// Copyright (c) 2016, Hewlett Packard Enterprise Development LP. All
> +rights reserved.<BR> // // SPDX-License-Identifier: BSD-2-Clause-Patent
> +// // **/
> +
> +
> +#string STR_MODULE_ABSTRACT #language en-US "Timer driver that
> provides Timer Arch protocol"
> +
> +#string STR_MODULE_DESCRIPTION #language en-US "Timer driver
> that provides Timer Arch protocol."
> diff --git a/UefiCpuPkg/CpuTimerDxe/CpuTimerExtra.uni
> b/UefiCpuPkg/CpuTimerDxe/CpuTimerExtra.uni
> new file mode 100644
> index 000000000000..ceb93a7ce82f
> --- /dev/null
> +++ b/UefiCpuPkg/CpuTimerDxe/CpuTimerExtra.uni
> @@ -0,0 +1,12 @@
> +// /** @file
> +// Timer Localized Strings and Content
> +//
> +// Copyright (c) 2016, Hewlett Packard Enterprise Development LP. All
> +rights reserved.<BR> // // SPDX-License-Identifier: BSD-2-Clause-Patent
> +// // **/
> +
> +#string STR_PROPERTIES_MODULE_NAME
> +#language en-US
> +"Timer DXE Driver"
> --
> 2.38.0
>
>
>
>
>
-=-=-=-=-=-=-=-=-=-=-=-
Groups.io Links: You receive all messages sent to this group.
View/Reply Online (#95272): https://edk2.groups.io/g/devel/message/95272
Mute This Topic: https://groups.io/mt/94330849/1787277
Group Owner: devel+owner@edk2.groups.io
Unsubscribe: https://edk2.groups.io/g/devel/unsub [importer@patchew.org]
-=-=-=-=-=-=-=-=-=-=-=-
© 2016 - 2026 Red Hat, Inc.