diff options
Diffstat (limited to 'roms/edk2/EmulatorPkg/Library/PeiTimerLib/PeiTimerLib.c')
| -rw-r--r-- | roms/edk2/EmulatorPkg/Library/PeiTimerLib/PeiTimerLib.c | 213 |
1 files changed, 213 insertions, 0 deletions
diff --git a/roms/edk2/EmulatorPkg/Library/PeiTimerLib/PeiTimerLib.c b/roms/edk2/EmulatorPkg/Library/PeiTimerLib/PeiTimerLib.c new file mode 100644 index 000000000..132abb2c0 --- /dev/null +++ b/roms/edk2/EmulatorPkg/Library/PeiTimerLib/PeiTimerLib.c @@ -0,0 +1,213 @@ +/** @file
+ A non-functional instance of the Timer Library.
+
+ Copyright (c) 2007 - 2019, Intel Corporation. All rights reserved.<BR>
+ SPDX-License-Identifier: BSD-2-Clause-Patent
+
+**/
+
+#include <PiPei.h>
+#include <Library/BaseLib.h>
+#include <Library/TimerLib.h>
+#include <Library/DebugLib.h>
+#include <Library/PeiServicesLib.h>
+
+#include <Ppi/EmuThunk.h>
+#include <Protocol/EmuThunk.h>
+
+/**
+ 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 The value of MicroSeconds inputted.
+
+**/
+UINTN
+EFIAPI
+MicroSecondDelay (
+ IN UINTN MicroSeconds
+ )
+{
+ return NanoSecondDelay (MicroSeconds * 1000);
+}
+
+/**
+ 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 The value of NanoSeconds inputted.
+
+**/
+UINTN
+EFIAPI
+NanoSecondDelay (
+ IN UINTN NanoSeconds
+ )
+{
+ EMU_THUNK_PPI *ThunkPpi;
+ EFI_STATUS Status;
+ EMU_THUNK_PROTOCOL *Thunk;
+
+ //
+ // Locate EmuThunkPpi for
+ //
+ Status = PeiServicesLocatePpi (
+ &gEmuThunkPpiGuid,
+ 0,
+ NULL,
+ (VOID **) &ThunkPpi
+ );
+ if (!EFI_ERROR (Status)) {
+ Thunk = (EMU_THUNK_PROTOCOL *)ThunkPpi->Thunk ();
+ Thunk->Sleep (NanoSeconds * 100);
+ return NanoSeconds;
+ }
+
+ return 0;
+}
+
+/**
+ 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
+ )
+{
+ EMU_THUNK_PPI *ThunkPpi;
+ EFI_STATUS Status;
+ EMU_THUNK_PROTOCOL *Thunk;
+
+ //
+ // Locate EmuThunkPpi for
+ //
+ Status = PeiServicesLocatePpi (
+ &gEmuThunkPpiGuid,
+ 0,
+ NULL,
+ (VOID **) &ThunkPpi
+ );
+ if (!EFI_ERROR (Status)) {
+ Thunk = (EMU_THUNK_PROTOCOL *)ThunkPpi->Thunk ();
+ return Thunk->QueryPerformanceCounter ();
+ }
+
+ return 0;
+}
+
+/**
+ 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
+ )
+{
+ EMU_THUNK_PPI *ThunkPpi;
+ EFI_STATUS Status;
+ EMU_THUNK_PROTOCOL *Thunk;
+
+ //
+ // Locate EmuThunkPpi for
+ //
+ Status = PeiServicesLocatePpi (
+ &gEmuThunkPpiGuid,
+ 0,
+ NULL,
+ (VOID **) &ThunkPpi
+ );
+ if (!EFI_ERROR (Status)) {
+ if (StartValue != NULL) {
+ *StartValue = 0ULL;
+ }
+ if (EndValue != NULL) {
+ *EndValue = (UINT64)-1LL;
+ }
+
+ Thunk = (EMU_THUNK_PROTOCOL *)ThunkPpi->Thunk ();
+ return Thunk->QueryPerformanceFrequency ();
+ }
+
+ return 0;
+}
+
+/**
+ 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;
+}
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