diff options
Diffstat (limited to 'MdePkg/Library/SecPeiDxeTimerLibCpu/X86TimerLib.c')
| -rw-r--r-- | MdePkg/Library/SecPeiDxeTimerLibCpu/X86TimerLib.c | 248 |
1 files changed, 248 insertions, 0 deletions
diff --git a/MdePkg/Library/SecPeiDxeTimerLibCpu/X86TimerLib.c b/MdePkg/Library/SecPeiDxeTimerLibCpu/X86TimerLib.c new file mode 100644 index 0000000..99b75d5 --- /dev/null +++ b/MdePkg/Library/SecPeiDxeTimerLibCpu/X86TimerLib.c @@ -0,0 +1,248 @@ +/** @file
+ Timer Library functions built upon local APIC on IA32/x64.
+
+ Copyright (c) 2006 - 2008, Intel Corporation<BR>
+ All rights reserved. This program and the accompanying materials
+ are licensed and made available under the terms and conditions of the BSD License
+ which accompanies this distribution. The full text of the license may be found at
+ http://opensource.org/licenses/bsd-license.php
+
+ THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+ WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+
+**/
+
+#include <Base.h>
+#include <Library/TimerLib.h>
+#include <Library/BaseLib.h>
+#include <Library/IoLib.h>
+#include <Library/DebugLib.h>
+#include <Library/PcdLib.h>
+
+
+//
+// The following array is used in calculating the frequency of local APIC
+// timer. Refer to IA-32 developers' manual for more details.
+//
+GLOBAL_REMOVE_IF_UNREFERENCED
+CONST UINT8 mTimerLibLocalApicDivisor[] = {
+ 0x02, 0x04, 0x08, 0x10,
+ 0x02, 0x04, 0x08, 0x10,
+ 0x20, 0x40, 0x80, 0x01,
+ 0x20, 0x40, 0x80, 0x01
+};
+
+/**
+ Internal function to retrieve the base address of local APIC.
+
+ Internal function to retrieve the base address of local APIC.
+
+ @return The base address of local APIC
+
+**/
+UINTN
+InternalX86GetApicBase (
+ VOID
+ )
+{
+ return (UINTN)AsmMsrBitFieldRead64 (27, 12, 35) << 12;
+}
+
+/**
+ Internal function to return the frequency of the local APIC timer.
+
+ Internal function to return the frequency of the local APIC timer.
+
+ @param ApicBase The base address of memory mapped registers of local APIC.
+
+ @return The frequency of the timer in Hz.
+
+**/
+UINT32
+InternalX86GetTimerFrequency (
+ IN UINTN ApicBase
+ )
+{
+ return
+ PcdGet32(PcdFSBClock) /
+ mTimerLibLocalApicDivisor[MmioBitFieldRead32 (ApicBase + 0x3e0, 0, 3)];
+}
+
+/**
+ Internal function to read the current tick counter of local APIC.
+
+ Internal function to read the current tick counter of local APIC.
+
+ @param ApicBase The base address of memory mapped registers of local APIC.
+
+ @return The tick counter read.
+
+**/
+INT32
+InternalX86GetTimerTick (
+ IN UINTN ApicBase
+ )
+{
+ return MmioRead32 (ApicBase + 0x390);
+}
+
+/**
+ 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 ApicBase The base address of memory mapped registers of local APIC.
+ @param Delay A period of time to delay in ticks.
+
+**/
+VOID
+InternalX86Delay (
+ IN UINTN ApicBase,
+ IN UINT32 Delay
+ )
+{
+ INT32 Ticks;
+
+ //
+ // The target timer count is calculated here
+ //
+ Ticks = InternalX86GetTimerTick (ApicBase) - Delay;
+
+ //
+ // Wait until time out
+ // Delay > 2^31 could not be handled by this function
+ // Timer wrap-arounds are handled correctly by this function
+ //
+ while (InternalX86GetTimerTick (ApicBase) - Ticks >= 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
+ )
+{
+ UINTN ApicBase;
+
+ ApicBase = InternalX86GetApicBase ();
+ InternalX86Delay (
+ ApicBase,
+ (UINT32)DivU64x32 (
+ MultU64x64 (
+ InternalX86GetTimerFrequency (ApicBase),
+ MicroSeconds
+ ),
+ 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
+ )
+{
+ UINTN ApicBase;
+
+ ApicBase = InternalX86GetApicBase ();
+ InternalX86Delay (
+ ApicBase,
+ (UINT32)DivU64x32 (
+ MultU64x64 (
+ InternalX86GetTimerFrequency (ApicBase),
+ NanoSeconds
+ ),
+ 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)(UINT32)InternalX86GetTimerTick (InternalX86GetApicBase ());
+}
+
+/**
+ 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
+ )
+{
+ UINTN ApicBase;
+
+ ApicBase = InternalX86GetApicBase ();
+
+ if (StartValue != NULL) {
+ *StartValue = MmioRead32 (ApicBase + 0x380);
+ }
+
+ if (EndValue != NULL) {
+ *EndValue = 0;
+ }
+
+ return (UINT64) InternalX86GetTimerFrequency (ApicBase);;
+}
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