f91029947b
Sstc extension allows to program the timer and receive the interrupt without using an SBI call. This reduces the latency to generate the timer interrupt. So, detect whether Sstc extension is supported and use the stimecmp register directly to program the timer interrupt. Cc: Gerd Hoffmann <kraxel@redhat.com> Cc: Rahul Kumar <rahul1.kumar@intel.com> Cc: Laszlo Ersek <lersek@redhat.com> Cc: Ray Ni <ray.ni@intel.com> Cc: Andrei Warkentin <andrei.warkentin@intel.com> Signed-off-by: Sunil V L <sunilvl@ventanamicro.com> Reviewed-by: Laszlo Ersek <lersek@redhat.com> Reviewed-by: Andrei Warkentin <andrei.warkentin@intel.com> Reviewed-by: Dhaval Sharma <dhaval@rivosinc.com>
56 lines
1.3 KiB
INI
56 lines
1.3 KiB
INI
## @file
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# Timer Arch protocol module
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#
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# Copyright (c) 2019, Hewlett Packard Enterprise Development LP. All rights reserved.<BR>
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#
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# SPDX-License-Identifier: BSD-2-Clause-Patent
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#
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##
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[Defines]
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INF_VERSION = 0x0001001b
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BASE_NAME = CpuTimerDxeRiscV64
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MODULE_UNI_FILE = CpuTimerDxeRiscV64.uni
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FILE_GUID = 055DDAC6-9142-4013-BF20-FC2E5BC325C9
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MODULE_TYPE = DXE_DRIVER
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VERSION_STRING = 1.0
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ENTRY_POINT = TimerDriverInitialize
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#
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# The following information is for reference only and not required by the build
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# tools.
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#
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# VALID_ARCHITECTURES = RISCV64
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#
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[Packages]
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MdePkg/MdePkg.dec
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UefiCpuPkg/UefiCpuPkg.dec
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[LibraryClasses]
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BaseLib
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DebugLib
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IoLib
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CpuLib
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UefiBootServicesTableLib
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UefiDriverEntryPoint
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[LibraryClasses.RISCV64]
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RiscVSbiLib
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[Sources.RISCV64]
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Timer.h
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Timer.c
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[Pcd]
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gEfiMdePkgTokenSpaceGuid.PcdRiscVFeatureOverride ## CONSUMES
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gUefiCpuPkgTokenSpaceGuid.PcdCpuCoreCrystalClockFrequency ## CONSUMES
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[Protocols]
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gEfiCpuArchProtocolGuid ## CONSUMES
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gEfiTimerArchProtocolGuid ## PRODUCES
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[Depex]
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gEfiCpuArchProtocolGuid
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[UserExtensions.TianoCore."ExtraFiles"]
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CpuTimerDxeRiscV64Extra.uni
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