Reviewed-by: Chao Li <lic...@loongson.cn> Thanks, Chao --------
On 11ζ 11 2022, at 5:12 δΈε, xianglai li <lixiang...@loongson.cn> wrote: > This library provides a delay interface and a timing interface. > > > > REF: https://bugzilla.tianocore.org/show_bug.cgi?id=4054 > > > Cc: Bibo Mao <maob...@loongson.cn> > Cc: Chao Li <lic...@loongson.cn> > Cc: Leif Lindholm <quic_llind...@quicinc.com> > Cc: Liming Gao <gaolim...@byosoft.com.cn> > Cc: Michael D Kinney <michael.d.kin...@intel.com> > Signed-off-by: xianglai li <lixiang...@loongson.cn> > --- > .../Include/Library/StableTimer.h | 59 +++++ > .../Library/StableTimerLib/Count.S | 52 ++++ > .../Library/StableTimerLib/TimerLib.c | 236 ++++++++++++++++++ > .../Library/StableTimerLib/TimerLib.inf | 32 +++ > 4 files changed, 379 insertions(+) > create mode 100644 > Platform/Loongson/LoongArchQemuPkg/Include/Library/StableTimer.h > create mode 100644 > Platform/Loongson/LoongArchQemuPkg/Library/StableTimerLib/Count.S > create mode 100644 > Platform/Loongson/LoongArchQemuPkg/Library/StableTimerLib/TimerLib.c > create mode 100644 > Platform/Loongson/LoongArchQemuPkg/Library/StableTimerLib/TimerLib.inf > > > diff --git a/Platform/Loongson/LoongArchQemuPkg/Include/Library/StableTimer.h > b/Platform/Loongson/LoongArchQemuPkg/Include/Library/StableTimer.h > new file mode 100644 > index 0000000000..93f5b66c34 > --- /dev/null > +++ b/Platform/Loongson/LoongArchQemuPkg/Include/Library/StableTimer.h > @@ -0,0 +1,59 @@ > +/** @file > + > + Copyright (c) 2022 Loongson Technology Corporation Limited. All rights > reserved.<BR> > + > + SPDX-License-Identifier: BSD-2-Clause-Patent > + > + @par Glossary: > + - Csr - Cpu Status Register > + - Calc - Calculation > + - Freq - frequency > +**/ > + > +#ifndef STABLE_TIMER_H_ > +#define STABLE_TIMER_H_ > +#include "Library/Cpu.h" > + > +/** > + Gets the timer count value. > + > + @param[] VOID > + > + @retval timer count value. > +**/ > +extern > +UINTN > +EFIAPI > +LoongArchReadTime ( > + VOID > + ); > + > +/** > + Calculate the timer frequency. > + > + @param[] VOID > + > + @retval Timer frequency. > +**/ > +UINT32 > +EFIAPI > +CalcConstFreq ( > + VOID > + ); > + > +/* > + Reads data from the specified CPUCFG register. > + > + @param[OUT] Val Pointer to the variable used to store the CPUCFG register > value. > + @param[IN] reg Specifies the register number of the CPUCFG to read the data. > + > + @retval none > + */ > +extern > +VOID > +LoongArchReadCpuCfg ( > + UINT64 *Val, > + UINT64 reg > + ); > + > +#endif // STABLE_TIMER_H_ > diff --git > a/Platform/Loongson/LoongArchQemuPkg/Library/StableTimerLib/Count.S > b/Platform/Loongson/LoongArchQemuPkg/Library/StableTimerLib/Count.S > new file mode 100644 > index 0000000000..4e0e718381 > --- /dev/null > +++ b/Platform/Loongson/LoongArchQemuPkg/Library/StableTimerLib/Count.S > @@ -0,0 +1,52 @@ > +#------------------------------------------------------------------------------ > +# > +# Count 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(CpuSetIP) > +ASM_GLOBAL ASM_PFX(LoongArchReadTime) > +ASM_GLOBAL ASM_PFX(LoongArchReadCpuCfg) > + > +# > +# Set cpu interrupts > +# @param A0 The interrupt number > +# > + > +ASM_PFX(CpuSetIP): > + csrrd T0, LOONGARCH_CSR_ECFG > + or T0, T0, A0 > + csrwr T0, LOONGARCH_CSR_ECFG > + jirl ZERO, RA, 0 > + > +# > +#Gets the timer count value. > +#@param[] VOID > +#@retval timer count value. > +# > + > +ASM_PFX(LoongArchReadTime): > + rdtime.d A0, ZERO > + jirl ZERO, RA, 0 > + > +# > +# Read Csr CPUCFG register. > +# @param A0 Pointer to the variable used to store the CPUCFG register value. > +# @param A1 Specifies the register number of the CPUCFG to read the data. > +# @retval none > +# > + > +ASM_PFX(LoongArchReadCpuCfg): > + cpucfg T0, A1 > + stptr.d T0, A0, 0 > + jirl ZERO, RA, 0 > diff --git > a/Platform/Loongson/LoongArchQemuPkg/Library/StableTimerLib/TimerLib.c > b/Platform/Loongson/LoongArchQemuPkg/Library/StableTimerLib/TimerLib.c > new file mode 100644 > index 0000000000..135fb22611 > --- /dev/null > +++ b/Platform/Loongson/LoongArchQemuPkg/Library/StableTimerLib/TimerLib.c > @@ -0,0 +1,236 @@ > +/** @file > + Generic LoongArch implementation of TimerLib.h > + > + Copyright (c) 2022 Loongson Technology Corporation Limited. All rights > reserved.<BR> > + > + SPDX-License-Identifier: BSD-2-Clause-Patent > + > + @par Glossary: > + - Freq - Frequency > + - Csr - Cpu Status Register > + - calc - calculate > +**/ > + > +#include <Base.h> > +#include <Library/TimerLib.h> > +#include <Library/BaseLib.h> > +#include <Library/DebugLib.h> > +#include "Library/StableTimer.h" > +#include "Library/Cpu.h" > + > +UINT32 StableTimerFreq = 0; > + > +/** > + Calculate the timer frequency. > + > + @param[] VOID > + > + @retval Timer frequency. > +**/ > +UINT32 > +EFIAPI > +CalcConstFreq ( > + VOID > + ) > +{ > + UINT32 Result; > + UINT32 BaseFreq; > + UINT32 ClockMultiplier; > + UINT32 ClockDivide; > + UINT64 Val; > + > + LoongArchReadCpuCfg (&Val, LOONGARCH_CPUCFG4); > + BaseFreq = (UINT32)Val; > + LoongArchReadCpuCfg (&Val, LOONGARCH_CPUCFG5); > + Result = (UINT32)Val; > + ClockMultiplier = Result & 0xffff; > + ClockDivide = (Result >> 16) & 0xffff; > + > + if ((!BaseFreq) || (!ClockMultiplier) || (!ClockDivide)) { > + return 0; > + } else { > + return (BaseFreq * ClockMultiplier / ClockDivide); > + } > +} > +/** > + Get the timer frequency. > + > + @param[] VOID > + > + @retval Timer frequency. > +**/ > +UINT32 > +EFIAPI > +GetFreq ( > + VOID > + ) > +{ > + if (StableTimerFreq) { > + } else { > + StableTimerFreq = CalcConstFreq (); > + } > + > + return StableTimerFreq; > +} > + > +/** > + 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 > + ) > +{ > + > + UINTN Count; > + UINTN Ticks; > + UINTN Start; > + UINTN End; > + > + Count = GetFreq (); > + Count = (Count * MicroSeconds) / 1000000; > + Start = LoongArchReadTime (); > + End = Start + Count; > + > + do { > + Ticks = LoongArchReadTime (); > + } while (Ticks < End); > + > + 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 > + ) > +{ > + UINT32 MicroSeconds; > + > + if (NanoSeconds % 1000 == 0) { > + MicroSeconds = NanoSeconds/1000; > + } else { > + MicroSeconds = NanoSeconds/1000 + 1; > + } > + MicroSecondDelay (MicroSeconds); > + > + 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 LoongArchReadTime (); > +} > +/** > + 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 = BIT2; > + } > + > + if (EndValue != NULL) { > + *EndValue = BIT48 - 1; > + } > + > + return GetFreq (); > +} > + > +/** > + 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 Frequency; > + UINT64 NanoSeconds; > + UINT64 Remainder; > + INTN Shift; > + > + Frequency = GetPerformanceCounterProperties (NULL, NULL); > + > + // > + // Ticks > + // Time = --------- x 1,000,000,000 > + // Frequency > + // > + NanoSeconds = MultU64x32 (DivU64x64Remainder (Ticks, Frequency, > &Remainder), 1000000000u); > + > + // > + // Ensure (Remainder * 1,000,000,000) will not overflow 64-bit. > + // Since 2^29 < 1,000,000,000 = 0x3B9ACA00 < 2^30, Remainder should < > 2^(64-30) = 2^34, > + // i.e. highest bit set in Remainder should <= 33. > + // > + Shift = MAX (0, HighBitSet64 (Remainder) - 33); > + Remainder = RShiftU64 (Remainder, (UINTN) Shift); > + Frequency = RShiftU64 (Frequency, (UINTN) Shift); > + NanoSeconds += DivU64x64Remainder (MultU64x32 (Remainder, 1000000000u), > Frequency, NULL); > + > + return NanoSeconds; > +} > diff --git > a/Platform/Loongson/LoongArchQemuPkg/Library/StableTimerLib/TimerLib.inf > b/Platform/Loongson/LoongArchQemuPkg/Library/StableTimerLib/TimerLib.inf > new file mode 100644 > index 0000000000..86f243998b > --- /dev/null > +++ b/Platform/Loongson/LoongArchQemuPkg/Library/StableTimerLib/TimerLib.inf > @@ -0,0 +1,32 @@ > +## @file > +# Generic LoongArch implementation of TimerLib.h > +# > +# Copyright (c) 2022 Loongson Technology Corporation Limited. All rights > reserved.<BR> > +# > +# SPDX-License-Identifier: BSD-2-Clause-Patent > +# > +## > + > +[Defines] > + INF_VERSION = 0x00010005 > + BASE_NAME = TimerLib > + FILE_GUID = 740389C7-CC44-4A2F-88DC-89D97D312E7C > + MODULE_TYPE = BASE > + VERSION_STRING = 1.0 > + LIBRARY_CLASS = TimerLib > + > +# > +# VALID_ARCHITECTURES = LOONGARCH64 > +# > + > +[Sources] > + TimerLib.c > + Count.S > + > +[Packages] > + Platform/Loongson/LoongArchQemuPkg/Loongson.dec > + MdePkg/MdePkg.dec > + > +[LibraryClasses] > + DebugLib > + IoLib > -- > 2.31.1 -=-=-=-=-=-=-=-=-=-=-=- Groups.io Links: You receive all messages sent to this group. View/Reply Online (#96291): https://edk2.groups.io/g/devel/message/96291 Mute This Topic: https://groups.io/mt/94955172/21656 Group Owner: devel+ow...@edk2.groups.io Unsubscribe: https://edk2.groups.io/g/devel/unsub [arch...@mail-archive.com] -=-=-=-=-=-=-=-=-=-=-=-
