REF: https://bugzilla.tianocore.org/show_bug.cgi?id=4076
Add the RISC-V instance of the TimerLib.
This is mostly copied from
edk2-platforms/Silicon/RISC-V/ProcessorPkg/Library/RiscVTimerLib
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>
Cc: Abner Chang <abner.chang@amd.com>
Cc: Gerd Hoffmann <kraxel@redhat.com>
Signed-off-by: Sunil V L <sunilvl@ventanamicro.com>
Acked-by: Abner Chang <abner.chang@amd.com>
Reviewed-by: Andrei Warkentin <andrei.warkentin@intel.com>
---
UefiCpuPkg/UefiCpuPkg.dsc | 1 +
UefiCpuPkg/Library/BaseRiscV64CpuTimerLib/BaseRiscV64CpuTimerLib.inf | 33 ++++
UefiCpuPkg/Library/BaseRiscV64CpuTimerLib/CpuTimerLib.c | 199 ++++++++++++++++++++
UefiCpuPkg/Library/BaseRiscV64CpuTimerLib/BaseRiscV64CpuTimerLib.uni | 14 ++
4 files changed, 247 insertions(+)
diff --git a/UefiCpuPkg/UefiCpuPkg.dsc b/UefiCpuPkg/UefiCpuPkg.dsc
index 35e66d93efa6..c511403842b8 100644
--- a/UefiCpuPkg/UefiCpuPkg.dsc
+++ b/UefiCpuPkg/UefiCpuPkg.dsc
@@ -197,6 +197,7 @@ [Components.X64]
[Components.RISCV64]
UefiCpuPkg/Library/BaseRiscV64CpuExceptionHandlerLib/BaseRiscV64CpuExceptionHandlerLib.inf
+ UefiCpuPkg/Library/BaseRiscV64CpuTimerLib/BaseRiscV64CpuTimerLib.inf
[BuildOptions]
*_*_*_CC_FLAGS = -D DISABLE_NEW_DEPRECATED_INTERFACES
diff --git a/UefiCpuPkg/Library/BaseRiscV64CpuTimerLib/BaseRiscV64CpuTimerLib.inf b/UefiCpuPkg/Library/BaseRiscV64CpuTimerLib/BaseRiscV64CpuTimerLib.inf
new file mode 100644
index 000000000000..3d5eaa41716d
--- /dev/null
+++ b/UefiCpuPkg/Library/BaseRiscV64CpuTimerLib/BaseRiscV64CpuTimerLib.inf
@@ -0,0 +1,33 @@
+## @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
+ MODULE_UNI_FILE = BaseRisV64CpuTimerLib.uni
+
+[Sources]
+ CpuTimerLib.c
+
+[Packages]
+ MdePkg/MdePkg.dec
+ UefiCpuPkg/UefiCpuPkg.dec
+
+[LibraryClasses]
+ BaseLib
+ PcdLib
+ DebugLib
+
+[Pcd]
+ gUefiCpuPkgTokenSpaceGuid.PcdCpuCoreCrystalClockFrequency ## CONSUMES
diff --git a/UefiCpuPkg/Library/BaseRiscV64CpuTimerLib/CpuTimerLib.c b/UefiCpuPkg/Library/BaseRiscV64CpuTimerLib/CpuTimerLib.c
new file mode 100644
index 000000000000..9c8efc0f3530
--- /dev/null
+++ b/UefiCpuPkg/Library/BaseRiscV64CpuTimerLib/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;
+}
diff --git a/UefiCpuPkg/Library/BaseRiscV64CpuTimerLib/BaseRiscV64CpuTimerLib.uni b/UefiCpuPkg/Library/BaseRiscV64CpuTimerLib/BaseRiscV64CpuTimerLib.uni
new file mode 100644
index 000000000000..bb061f9a8ff0
--- /dev/null
+++ b/UefiCpuPkg/Library/BaseRiscV64CpuTimerLib/BaseRiscV64CpuTimerLib.uni
@@ -0,0 +1,14 @@
+// /** @file
+// Base CPU Timer Library for RISC-V
+//
+// Copyright (c) 2023, Ventana Micro Systems Inc. All rights reserved.<BR>
+//
+// SPDX-License-Identifier: BSD-2-Clause-Patent
+//
+// **/
+
+
+#string STR_MODULE_ABSTRACT #language en-US "RISC-V CPU Timer Library"
+
+#string STR_MODULE_DESCRIPTION #language en-US "Provides basic timer support for RISC-V."
+
--
2.34.1
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-=-=-=-=-=-=-=-=-=-=-=-Acked-by: Ray Ni <ray.ni@intel.com>
> -----Original Message-----
> From: devel@edk2.groups.io <devel@edk2.groups.io> On Behalf Of Sunil V L
> Sent: Friday, February 10, 2023 8:30 PM
> To: devel@edk2.groups.io
> Cc: Dong, Eric <eric.dong@intel.com>; Ni, Ray <ray.ni@intel.com>; Kumar,
> Rahul R <rahul.r.kumar@intel.com>; Daniel Schaefer <git@danielschaefer.me>;
> Abner Chang <abner.chang@amd.com>; Gerd Hoffmann <kraxel@redhat.com>;
> Warkentin, Andrei <andrei.warkentin@intel.com>
> Subject: [edk2-devel] [edk2-staging/RiscV64QemuVirt PATCH V8 06/19]
> UefiCpuPkg: Add BaseRiscV64CpuTimerLib library
>
> REF: https://bugzilla.tianocore.org/show_bug.cgi?id=4076
>
> Add the RISC-V instance of the TimerLib.
>
> This is mostly copied from
> edk2-platforms/Silicon/RISC-V/ProcessorPkg/Library/RiscVTimerLib
>
> 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>
> Cc: Abner Chang <abner.chang@amd.com>
> Cc: Gerd Hoffmann <kraxel@redhat.com>
> Signed-off-by: Sunil V L <sunilvl@ventanamicro.com>
> Acked-by: Abner Chang <abner.chang@amd.com>
> Reviewed-by: Andrei Warkentin <andrei.warkentin@intel.com>
> ---
> UefiCpuPkg/UefiCpuPkg.dsc | 1 +
> UefiCpuPkg/Library/BaseRiscV64CpuTimerLib/BaseRiscV64CpuTimerLib.inf | 33
> ++++
> UefiCpuPkg/Library/BaseRiscV64CpuTimerLib/CpuTimerLib.c | 199
> ++++++++++++++++++++
> UefiCpuPkg/Library/BaseRiscV64CpuTimerLib/BaseRiscV64CpuTimerLib.uni |
> 14 ++
> 4 files changed, 247 insertions(+)
>
> diff --git a/UefiCpuPkg/UefiCpuPkg.dsc b/UefiCpuPkg/UefiCpuPkg.dsc
> index 35e66d93efa6..c511403842b8 100644
> --- a/UefiCpuPkg/UefiCpuPkg.dsc
> +++ b/UefiCpuPkg/UefiCpuPkg.dsc
> @@ -197,6 +197,7 @@ [Components.X64]
>
> [Components.RISCV64]
>
> UefiCpuPkg/Library/BaseRiscV64CpuExceptionHandlerLib/BaseRiscV64CpuExce
> ptionHandlerLib.inf
> + UefiCpuPkg/Library/BaseRiscV64CpuTimerLib/BaseRiscV64CpuTimerLib.inf
>
> [BuildOptions]
> *_*_*_CC_FLAGS = -D DISABLE_NEW_DEPRECATED_INTERFACES
> diff --git
> a/UefiCpuPkg/Library/BaseRiscV64CpuTimerLib/BaseRiscV64CpuTimerLib.inf
> b/UefiCpuPkg/Library/BaseRiscV64CpuTimerLib/BaseRiscV64CpuTimerLib.inf
> new file mode 100644
> index 000000000000..3d5eaa41716d
> --- /dev/null
> +++
> b/UefiCpuPkg/Library/BaseRiscV64CpuTimerLib/BaseRiscV64CpuTimerLib.inf
> @@ -0,0 +1,33 @@
> +## @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
> + MODULE_UNI_FILE = BaseRisV64CpuTimerLib.uni
> +
> +[Sources]
> + CpuTimerLib.c
> +
> +[Packages]
> + MdePkg/MdePkg.dec
> + UefiCpuPkg/UefiCpuPkg.dec
> +
> +[LibraryClasses]
> + BaseLib
> + PcdLib
> + DebugLib
> +
> +[Pcd]
> + gUefiCpuPkgTokenSpaceGuid.PcdCpuCoreCrystalClockFrequency ##
> CONSUMES
> diff --git a/UefiCpuPkg/Library/BaseRiscV64CpuTimerLib/CpuTimerLib.c
> b/UefiCpuPkg/Library/BaseRiscV64CpuTimerLib/CpuTimerLib.c
> new file mode 100644
> index 000000000000..9c8efc0f3530
> --- /dev/null
> +++ b/UefiCpuPkg/Library/BaseRiscV64CpuTimerLib/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;
> +}
> diff --git
> a/UefiCpuPkg/Library/BaseRiscV64CpuTimerLib/BaseRiscV64CpuTimerLib.uni
> b/UefiCpuPkg/Library/BaseRiscV64CpuTimerLib/BaseRiscV64CpuTimerLib.uni
> new file mode 100644
> index 000000000000..bb061f9a8ff0
> --- /dev/null
> +++
> b/UefiCpuPkg/Library/BaseRiscV64CpuTimerLib/BaseRiscV64CpuTimerLib.uni
> @@ -0,0 +1,14 @@
> +// /** @file
> +// Base CPU Timer Library for RISC-V
> +//
> +// Copyright (c) 2023, Ventana Micro Systems Inc. All rights reserved.<BR>
> +//
> +// SPDX-License-Identifier: BSD-2-Clause-Patent
> +//
> +// **/
> +
> +
> +#string STR_MODULE_ABSTRACT #language en-US "RISC-V CPU Timer
> Library"
> +
> +#string STR_MODULE_DESCRIPTION #language en-US "Provides basic
> timer support for RISC-V."
> +
> --
> 2.34.1
>
>
>
>
>
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