[edk2-devel] [edk2-staging/RiscV64QemuVirt PATCH V7 08/20] UefiCpuPkg/CpuTimerLib: Add RISC-V instance
Ni, Ray
ray.ni at intel.com
Thu Feb 9 05:37:29 UTC 2023
Can you rename CpuTimerLib to RiscVTimerLib or something else that's more specific?
RiscV64 sub-directory might not be necessary.
> -----Original Message-----
> From: Sunil V L <sunilvl at ventanamicro.com>
> Sent: Sunday, January 29, 2023 3:18 AM
> To: devel at edk2.groups.io
> Cc: Dong, Eric <eric.dong at intel.com>; Ni, Ray <ray.ni at intel.com>; Kumar,
> Rahul R <rahul.r.kumar at intel.com>; Daniel Schaefer
> <git at danielschaefer.me>; Abner Chang <abner.chang at amd.com>; Gerd
> Hoffmann <kraxel at redhat.com>
> Subject: [edk2-staging/RiscV64QemuVirt PATCH V7 08/20]
> UefiCpuPkg/CpuTimerLib: Add RISC-V instance
>
> REF: https://bugzilla.tianocore.org/show_bug.cgi?id=4076
>
> This is mostly copied from
> edk2-platforms/Silicon/RISC-V/ProcessorPkg/Library/RiscVTimerLib
>
> Cc: Eric Dong <eric.dong at intel.com>
> Cc: Ray Ni <ray.ni at intel.com>
> Cc: Rahul Kumar <rahul1.kumar at intel.com>
> Cc: Daniel Schaefer <git at danielschaefer.me>
> Cc: Abner Chang <abner.chang at amd.com>
> Cc: Gerd Hoffmann <kraxel at redhat.com>
> Signed-off-by: Sunil V L <sunilvl at ventanamicro.com>
> Acked-by: Abner Chang <abner.chang at amd.com>
> ---
> UefiCpuPkg/UefiCpuPkg.dsc | 1 +
> UefiCpuPkg/Library/CpuTimerLib/BaseRiscV64CpuTimerLib.inf | 32 ++++
> UefiCpuPkg/Library/CpuTimerLib/RiscV64/CpuTimerLib.c | 199
> ++++++++++++++++++++
> 3 files changed, 232 insertions(+)
>
> diff --git a/UefiCpuPkg/UefiCpuPkg.dsc b/UefiCpuPkg/UefiCpuPkg.dsc
> index 8f2be6cd1b05..2df02bf75a35 100644
> --- a/UefiCpuPkg/UefiCpuPkg.dsc
> +++ b/UefiCpuPkg/UefiCpuPkg.dsc
> @@ -199,6 +199,7 @@ [Components.RISCV64]
> UefiCpuPkg/CpuTimerDxe/CpuTimerDxe.inf
>
> UefiCpuPkg/Library/CpuExceptionHandlerLib/BaseRiscV64CpuExceptionHan
> dlerLib.inf
> UefiCpuPkg/CpuDxe/CpuDxeRiscV64.inf
> + UefiCpuPkg/Library/CpuTimerLib/BaseRiscV64CpuTimerLib.inf
>
> [BuildOptions]
> *_*_*_CC_FLAGS = -D DISABLE_NEW_DEPRECATED_INTERFACES
> diff --git a/UefiCpuPkg/Library/CpuTimerLib/BaseRiscV64CpuTimerLib.inf
> b/UefiCpuPkg/Library/CpuTimerLib/BaseRiscV64CpuTimerLib.inf
> new file mode 100644
> index 000000000000..c920e8e098b5
> --- /dev/null
> +++ b/UefiCpuPkg/Library/CpuTimerLib/BaseRiscV64CpuTimerLib.inf
> @@ -0,0 +1,32 @@
> +## @file
> +# RISC-V Base CPU Timer Library Instance
> +#
> +# Copyright (c) 2016 - 2019, Hewlett Packard Enterprise Development LP. All
> rights reserved.<BR>
> +# Copyright (c) 2022, Ventana Micro Systems Inc. All rights reserved.<BR>
> +#
> +# SPDX-License-Identifier: BSD-2-Clause-Patent
> +#
> +##
> +
> +[Defines]
> + INF_VERSION = 0x0001001B
> + BASE_NAME = BaseRisV64CpuTimerLib
> + FILE_GUID = B635A600-EA24-4199-88E8-5761EEA96A51
> + MODULE_TYPE = BASE
> + VERSION_STRING = 1.0
> + LIBRARY_CLASS = TimerLib
> +
> +[Sources]
> + RiscV64/CpuTimerLib.c
> +
> +[Packages]
> + MdePkg/MdePkg.dec
> + UefiCpuPkg/UefiCpuPkg.dec
> +
> +[LibraryClasses]
> + BaseLib
> + PcdLib
> + DebugLib
> +
> +[Pcd]
> + gUefiCpuPkgTokenSpaceGuid.PcdCpuCoreCrystalClockFrequency ##
> CONSUMES
> diff --git a/UefiCpuPkg/Library/CpuTimerLib/RiscV64/CpuTimerLib.c
> b/UefiCpuPkg/Library/CpuTimerLib/RiscV64/CpuTimerLib.c
> new file mode 100644
> index 000000000000..9c8efc0f3530
> --- /dev/null
> +++ b/UefiCpuPkg/Library/CpuTimerLib/RiscV64/CpuTimerLib.c
> @@ -0,0 +1,199 @@
> +/** @file
> + RISC-V instance of Timer Library.
> +
> + Copyright (c) 2016 - 2022, Hewlett Packard Enterprise Development LP. All
> rights reserved.<BR>
> +
> + SPDX-License-Identifier: BSD-2-Clause-Patent
> +
> +**/
> +
> +#include <Uefi.h>
> +#include <Library/BaseLib.h>
> +#include <Library/DebugLib.h>
> +#include <Library/PcdLib.h>
> +#include <Register/RiscV64/RiscVImpl.h>
> +
> +/**
> + Stalls the CPU for at least the given number of ticks.
> +
> + Stalls the CPU for at least the given number of ticks. It's invoked by
> + MicroSecondDelay() and NanoSecondDelay().
> +
> + @param Delay A period of time to delay in ticks.
> +
> +**/
> +VOID
> +InternalRiscVTimerDelay (
> + IN UINT32 Delay
> + )
> +{
> + UINT32 Ticks;
> + UINT32 Times;
> +
> + Times = Delay >> (RISCV_TIMER_COMPARE_BITS - 2);
> + Delay &= ((1 << (RISCV_TIMER_COMPARE_BITS - 2)) - 1);
> + do {
> + //
> + // The target timer count is calculated here
> + //
> + Ticks = RiscVReadTimer () + Delay;
> + Delay = 1 << (RISCV_TIMER_COMPARE_BITS - 2);
> + while (((Ticks - RiscVReadTimer ()) & (1 << (RISCV_TIMER_COMPARE_BITS
> - 1))) == 0) {
> + CpuPause ();
> + }
> + } while (Times-- > 0);
> +}
> +
> +/**
> + Stalls the CPU for at least the given number of microseconds.
> +
> + Stalls the CPU for the number of microseconds specified by MicroSeconds.
> +
> + @param MicroSeconds The minimum number of microseconds to delay.
> +
> + @return MicroSeconds
> +
> +**/
> +UINTN
> +EFIAPI
> +MicroSecondDelay (
> + IN UINTN MicroSeconds
> + )
> +{
> + InternalRiscVTimerDelay (
> + (UINT32)DivU64x32 (
> + MultU64x32 (
> + MicroSeconds,
> + PcdGet64 (PcdCpuCoreCrystalClockFrequency)
> + ),
> + 1000000u
> + )
> + );
> + return MicroSeconds;
> +}
> +
> +/**
> + Stalls the CPU for at least the given number of nanoseconds.
> +
> + Stalls the CPU for the number of nanoseconds specified by NanoSeconds.
> +
> + @param NanoSeconds The minimum number of nanoseconds to delay.
> +
> + @return NanoSeconds
> +
> +**/
> +UINTN
> +EFIAPI
> +NanoSecondDelay (
> + IN UINTN NanoSeconds
> + )
> +{
> + InternalRiscVTimerDelay (
> + (UINT32)DivU64x32 (
> + MultU64x32 (
> + NanoSeconds,
> + PcdGet64 (PcdCpuCoreCrystalClockFrequency)
> + ),
> + 1000000000u
> + )
> + );
> + return NanoSeconds;
> +}
> +
> +/**
> + Retrieves the current value of a 64-bit free running performance counter.
> +
> + 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
> + )
> +{
> + return (UINT64)RiscVReadTimer ();
> +}
> +
> +/**return
> + 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) {
> + *StartValue = 0;
> + }
> +
> + if (EndValue != NULL) {
> + *EndValue = 32 - 1;
> + }
> +
> + return PcdGet64 (PcdCpuCoreCrystalClockFrequency);
> +}
> +
> +/**
> + Converts elapsed ticks of performance counter to time in nanoseconds.
> +
> + This function converts the elapsed ticks of running performance counter to
> + time value in unit of nanoseconds.
> +
> + @param Ticks The number of elapsed ticks of running performance
> counter.
> +
> + @return The elapsed time in nanoseconds.
> +
> +**/
> +UINT64
> +EFIAPI
> +GetTimeInNanoSecond (
> + IN UINT64 Ticks
> + )
> +{
> + UINT64 NanoSeconds;
> + UINT32 Remainder;
> +
> + //
> + // Ticks
> + // Time = --------- x 1,000,000,000
> + // Frequency
> + //
> + NanoSeconds = MultU64x32 (DivU64x32Remainder (Ticks, PcdGet64
> (PcdCpuCoreCrystalClockFrequency), &Remainder), 1000000000u);
> +
> + //
> + // Frequency < 0x100000000, so Remainder < 0x100000000, then
> (Remainder * 1,000,000,000)
> + // will not overflow 64-bit.
> + //
> + NanoSeconds += DivU64x32 (MultU64x32 ((UINT64)Remainder,
> 1000000000u), PcdGet64 (PcdCpuCoreCrystalClockFrequency));
> +
> + return NanoSeconds;
> +}
> --
> 2.38.0
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