[edk2-devel] [edk2-platforms][PATCH V5 10/15] Platform/Loongson: Add timer Dxe driver.

Fri Nov 11 09:47:13 UTC 2022

Reviewed-by: Chao Li <lichao at loongson.cn>

Thanks,
Chao
--------

On 11月 11 2022, at 5:12 下午, xianglai li <lixianglai at loongson.cn> wrote:
> This driver produces Timer Architectural Protocol,
>
> Registers a timer interrupt and initializes the timer.
>
>
> REF: https://bugzilla.tianocore.org/show_bug.cgi?id=4054
>
>
> Cc: Bibo Mao <maobibo at loongson.cn>
> Cc: Chao Li <lichao at loongson.cn>
> Cc: Leif Lindholm <quic_llindhol at quicinc.com>
> Cc: Liming Gao <gaoliming at byosoft.com.cn>
> Cc: Michael D Kinney <michael.d.kinney at intel.com>
> Signed-off-by: xianglai li <lixianglai at loongson.cn>
> ---
> .../Drivers/StableTimerDxe/Timer.c | 388 ++++++++++++++++++
> .../Drivers/StableTimerDxe/Timer.h | 172 ++++++++
> .../Drivers/StableTimerDxe/TimerConfig.S | 38 ++
> .../Drivers/StableTimerDxe/TimerDxe.inf | 44 ++
> 4 files changed, 642 insertions(+)
> create mode 100644 Platform/Loongson/LoongArchQemuPkg/Drivers/StableTimerDxe/Timer.c
> create mode 100644 Platform/Loongson/LoongArchQemuPkg/Drivers/StableTimerDxe/Timer.h
> create mode 100644 Platform/Loongson/LoongArchQemuPkg/Drivers/StableTimerDxe/TimerConfig.S
> create mode 100644 Platform/Loongson/LoongArchQemuPkg/Drivers/StableTimerDxe/TimerDxe.inf
>
>
> diff --git a/Platform/Loongson/LoongArchQemuPkg/Drivers/StableTimerDxe/Timer.c b/Platform/Loongson/LoongArchQemuPkg/Drivers/StableTimerDxe/Timer.c
> new file mode 100644
> index 0000000000..e09da71272
> --- /dev/null
> +++ b/Platform/Loongson/LoongArchQemuPkg/Drivers/StableTimerDxe/Timer.c
> @@ -0,0 +1,388 @@
> +/** @file
> + Timer Architectural Protocol as defined in the DXE CIS
> +
> + Copyright (c) 2022 Loongson Technology Corporation Limited. All rights reserved.<BR>
> +
> + SPDX-License-Identifier: BSD-2-Clause-Patent
> +
> +**/
> +
> +#include <Protocol/Cpu.h>
> +#include "Library/Cpu.h"
> +#include <Library/DebugLib.h>
> +#include <Library/StableTimer.h>
> +#include "Timer.h"
> +#include <Library/TimerLib.h>
> +#include <Library/UefiBootServicesTableLib.h>
> +
> +//
> +// The handle onto which the Timer Architectural Protocol will be installed
> +//
> +EFI_HANDLE mTimerHandle = NULL;
> +EFI_EVENT EfiExitBootServicesEvent = (EFI_EVENT)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.
> +//
> +EFI_TIMER_NOTIFY mTimerNotifyFunction;
> +
> +//
> +// The current period of the timer interrupt
> +//
> +volatile UINT64 mTimerPeriod = 0;
> +volatile UINT64 mTimerTicks = 0;
> +
> +//
> +// Const frequence in Hz
> +//
> +extern UINT32 StableTimerFreq;
> +
> +/**
> + Sets the counter value for timer.
> +
> + @param Count The 16-bit counter value to program into stable timer.
> +
> + @retval VOID
> +**/
> +VOID
> +SetPitCount (
> + IN UINT64 Count
> + )
> +{
> + if (Count <= 4) {
> + return;
> + }
> +
> + Count &= LOONGARCH_CSR_TMCFG_TIMEVAL;
> + Count |= LOONGARCH_CSR_TMCFG_EN | LOONGARCH_CSR_TMCFG_PERIOD;
> + LoongarchWriteqTmcfg (Count);
> +}
> +
> +/**
> + Timer Interrupt Handler.
> +
> + @param InterruptType The type of interrupt that occurred
> + @param SystemContext A pointer to the system context when the interrupt occurred
> +
> + @retval VOID
> +**/
> +VOID
> +EFIAPI
> +TimerInterruptHandler (
> + IN EFI_EXCEPTION_TYPE InterruptType,
> + IN EFI_SYSTEM_CONTEXT SystemContext
> + )
> +{
> + EFI_TPL OriginalTPL;
> +
> + OriginalTPL = gBS->RaiseTPL (TPL_HIGH_LEVEL);
> +
> + //
> + // Clear interrupt.
> + //
> + LoongarchWriteqTintclr (0x1);
> +
> + if (mTimerNotifyFunction != NULL) {
> + //
> + // @bug : This does not handle missed timer interrupts
> + //
> + mTimerNotifyFunction (mTimerPeriod);
> + }
> +
> + gBS->RestoreTPL (OriginalTPL);
> +}
> +
> +/**
> + 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
> + )
> +{
> + //
> + // Check for invalid parameters
> + //
> + if ((NotifyFunction == NULL)
> + && (mTimerNotifyFunction == NULL))
> + {
> + return EFI_INVALID_PARAMETER;
> + }
> +
> + if ((NotifyFunction != NULL)
> + && mTimerNotifyFunction != NULL)
> + {
> + return EFI_ALREADY_STARTED;
> + }
> +
> + 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 TimerCount;
> +
> + if (TimerPeriod == 0) {
> + //
> + // Disable timer interrupt for a TimerPeriod of 0
> + //
> + mCpu->DisableInterrupt (mCpu);
> + } else {
> +
> + TimerCount = TimerPeriod * StableTimerFreq / 10000000ULL;
> +
> + if (TimerCount >= BIT48) {
> + TimerCount = 0;
> + }
> +
> + //
> + // Program the stable timer with the new count value
> + //
> + mTimerTicks = TimerCount;
> + SetPitCount (TimerCount);
> +
> + //
> + // Enable timer interrupt
> + //
> + mCpu->EnableInterrupt (mCpu);
> + }
> +
> + //
> + // 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;
> +}
> +
> +/**
> + Disable the timer
> + DXE Core will disable the timer after all the event handlers have run.
> +
> + @param[in] Event The Event that is being processed
> + @param[in] Context Event Context
> +**/
> +VOID
> +EFIAPI
> +ExitBootServicesEvent (
> + IN EFI_EVENT Event,
> + IN VOID *Context
> + )
> +{
> + /*
> + * Disable timer interrupt when exiting boot service
> + */
> + LoongarchWriteqTmcfg (0);
> +}
> +
> +/**
> + 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;
> +}
> +
> +/**
> + 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 occurred attempting to initialize the driver.
> +**/
> +EFI_STATUS
> +EFIAPI
> +StableTimerDriverInitialize (
> + IN EFI_HANDLE ImageHandle,
> + IN EFI_SYSTEM_TABLE *SystemTable
> + )
> +{
> + EFI_STATUS Status;
> + UINT32 TimerVector;
> +
> + //
> + // 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);
> +
> + //
> + // Calculate const frequence
> + //
> + StableTimerFreq = CalcConstFreq ();
> + DEBUG ((DEBUG_INFO, "===========Stable timer freq %d Hz=============\n", StableTimerFreq));
> +
> + //
> + // Install interrupt handler for Stable Timer #0 (ISA IRQ0)
> + //
> + TimerVector = EXCEPT_LOONGARCH_INT_TIMER;
> + Status = mCpu->RegisterInterruptHandler (mCpu, TimerVector, TimerInterruptHandler);
> + ASSERT_EFI_ERROR (Status);
> +
> + //
> + // Enable TI local timer interrupt
> + //
> + CpuSetIP (1 << 11);
> +
> + //
> + // 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);
> +
> + // Register for an ExitBootServicesEvent
> + Status = gBS->CreateEvent (EVT_SIGNAL_EXIT_BOOT_SERVICES, TPL_NOTIFY, ExitBootServicesEvent, NULL,
> + &EfiExitBootServicesEvent);
> + ASSERT_EFI_ERROR (Status);
> +
> + return Status;
> +}
> diff --git a/Platform/Loongson/LoongArchQemuPkg/Drivers/StableTimerDxe/Timer.h b/Platform/Loongson/LoongArchQemuPkg/Drivers/StableTimerDxe/Timer.h
> new file mode 100644
> index 0000000000..84036cab00
> --- /dev/null
> +++ b/Platform/Loongson/LoongArchQemuPkg/Drivers/StableTimerDxe/Timer.h
> @@ -0,0 +1,172 @@
> +/** @file
> + Private data structures
> +
> + Copyright (c) 2022 Loongson Technology Corporation Limited. All rights reserved.<BR>
> +
> + SPDX-License-Identifier: BSD-2-Clause-Patent
> +
> +**/
> +
> +#ifndef TIMER_H_
> +#define TIMER_H_
> +
> +#include <Protocol/Timer.h>
> +
> +#define DEFAULT_TIMER_TICK_DURATION 100000 //10ms = 100000 100 ns units
> +#define SR_IP7 (1 << 15)
> +//
> +// Function Prototypes
> +//
> +extern UINT32 EFIAPI CpuGetCompare(VOID);
> +extern VOID EFIAPI CpuSetCompare(IN UINT32 val);
> +extern VOID EFIAPI CpuSetIP(IN UINT32 val);
> +extern VOID EFIAPI ClearC0Cause(IN UINT32 val);
> +extern VOID EFIAPI ClearC0Status(IN UINT32 val);
> +/**
> + 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 occurred 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_UNSUPPORTED The platform does not support the generation of soft timer interrupts.
> +**/
> +EFI_STATUS
> +EFIAPI
> +TimerDriverGenerateSoftInterrupt (
> + IN EFI_TIMER_ARCH_PROTOCOL *This
> + );
> +
> +/**
> + Write Csr TMCFG register.
> +
> + @param A0 The value used to write to the TMCFG register
> +
> + @retval none
> +**/
> +extern
> +VOID
> +LoongarchWriteqTmcfg (
> + IN UINT64 Val
> + );
> +
> +/**
> + Write Csr TINTCLR register.
> +
> + @param A0 The value used to write to the TINTCLR register
> +
> + @retval none
> +**/
> +extern
> +VOID
> +LoongarchWriteqTintclr (
> + IN UINT64 Val
> + );
> +
> +#endif // TIMER_H_
> diff --git a/Platform/Loongson/LoongArchQemuPkg/Drivers/StableTimerDxe/TimerConfig.S b/Platform/Loongson/LoongArchQemuPkg/Drivers/StableTimerDxe/TimerConfig.S
> new file mode 100644
> index 0000000000..2f364c193d
> --- /dev/null
> +++ b/Platform/Loongson/LoongArchQemuPkg/Drivers/StableTimerDxe/TimerConfig.S
> @@ -0,0 +1,38 @@
> +#------------------------------------------------------------------------------
> +#
> +# Timer Cfg for LoongArch
> +#
> +# Copyright (c) 2022 Loongson Technology Corporation Limited. All rights reserved.<BR>
> +#
> +# SPDX-License-Identifier: BSD-2-Clause-Patent
> +#
> +#------------------------------------------------------------------------------
> +
> +#ifndef __ASSEMBLY__
> +#define __ASSEMBLY__
> +#endif
> +
> +#include "Library/Cpu.h"
> +
> +ASM_GLOBAL ASM_PFX(LoongarchWriteqTmcfg)
> +ASM_GLOBAL ASM_PFX(LoongarchWriteqTintclr)
> +
> +#
> +# Write Csr TMCFG register.
> +# @param A0 The value used to write to the TMCFG register
> +# @retval none
> +#
> +
> +ASM_PFX(LoongarchWriteqTmcfg):
> + csrwr A0, LOONGARCH_CSR_TMCFG
> + jirl ZERO, RA,0
> +
> +#
> +# Write Csr TINTCLR register.
> +# @param A0 The value used to write to the TINTCLR register
> +# @retval none
> +#
> +
> +ASM_PFX(LoongarchWriteqTintclr):
> + csrwr A0, LOONGARCH_CSR_TINTCLR
> + jirl ZERO, RA,0
> diff --git a/Platform/Loongson/LoongArchQemuPkg/Drivers/StableTimerDxe/TimerDxe.inf b/Platform/Loongson/LoongArchQemuPkg/Drivers/StableTimerDxe/TimerDxe.inf
> new file mode 100644
> index 0000000000..d4a07c8759
> --- /dev/null
> +++ b/Platform/Loongson/LoongArchQemuPkg/Drivers/StableTimerDxe/TimerDxe.inf
> @@ -0,0 +1,44 @@
> +## @file
> +# Stable timer driver that provides Timer Arch protocol.
> +#
> +# Copyright (c) 2022 Loongson Technology Corporation Limited. All rights reserved.<BR>
> +#
> +# SPDX-License-Identifier: BSD-2-Clause-Patent
> +#
> +##
> +[Defines]
> + INF_VERSION = 0x00010005
> + BASE_NAME = Timer
> + MODULE_UNI_FILE = Timer.uni
> + FILE_GUID = AEBE2648-47A9-40FA-83FD-06AA88443BB2
> + MODULE_TYPE = DXE_DRIVER
> + VERSION_STRING = 1.0
> + ENTRY_POINT = StableTimerDriverInitialize
> +
> +#
> +# VALID_ARCHITECTURES = LOONGARCH64
> +#
> +
> +[Sources]
> + Timer.h
> + Timer.c
> + TimerConfig.S
> +
> +[Packages]
> + MdePkg/MdePkg.dec
> + Platform/Loongson/LoongArchQemuPkg/Loongson.dec
> +
> +[LibraryClasses]
> + UefiBootServicesTableLib
> + BaseLib
> + DebugLib
> + UefiDriverEntryPoint
> + IoLib
> + TimerLib
> +
> +[Protocols]
> + gEfiCpuArchProtocolGuid ## CONSUMES
> + gEfiTimerArchProtocolGuid ## PRODUCES
> +
> +[depex]
> + TRUE
> --
> 2.31.1


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