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Diffstat (limited to 'EDK/Foundation/Library/EdkIIGlueLib/Library/BaseTimerLibLocalApic/x86TimerLib.c')
| -rw-r--r-- | EDK/Foundation/Library/EdkIIGlueLib/Library/BaseTimerLibLocalApic/x86TimerLib.c | 293 |
1 files changed, 293 insertions, 0 deletions
diff --git a/EDK/Foundation/Library/EdkIIGlueLib/Library/BaseTimerLibLocalApic/x86TimerLib.c b/EDK/Foundation/Library/EdkIIGlueLib/Library/BaseTimerLibLocalApic/x86TimerLib.c new file mode 100644 index 0000000..a19e16d --- /dev/null +++ b/EDK/Foundation/Library/EdkIIGlueLib/Library/BaseTimerLibLocalApic/x86TimerLib.c @@ -0,0 +1,293 @@ +/*++ + +Copyright (c) 2004 - 2011, Intel Corporation +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. + + +Module Name: + + x86TimerLib.c + +Abstract: + + Timer Library functions built upon local APIC on IA32/x64. + + @bug Should use PCD to retrieve all the constants including index of + the IA32_APIC_BASE MSR, the offsets of InitialCount, CorrentCount + and DivideConfiguration. + +--*/ + +#include "EdkIIGlueBase.h" + +// +// The following 2 arrays are used in calculating the frequency of local APIC +// timer. Refer to IA-32 developers' manual for more details. +// + +GLOBAL_REMOVE_IF_UNREFERENCED +CONST UINT32 mTimerLibLocalApicFrequencies[] = { + 100000000, + 133000000, + 200000000, + 166000000 +}; + +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 + +**/ +STATIC +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. + +**/ +STATIC +UINT32 +InternalX86GetTimerFrequency ( + IN UINTN ApicBase + ) +{ + return + mTimerLibLocalApicFrequencies[AsmMsrBitFieldRead32 (44, 16, 18)] / + 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. + +**/ +STATIC +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. + +**/ +STATIC +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 (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 ( + IN UINT64 *StartValue, + IN UINT64 *EndValue + ) +{ + UINTN ApicBase; + + ApicBase = InternalX86GetApicBase (); + + if (StartValue != NULL) { + *StartValue = MmioRead32 (ApicBase + 0x380); + } + + if (EndValue != NULL) { + *EndValue = 0; + } + + return InternalX86GetTimerFrequency (ApicBase); +} + +/** + Retrieves current APIC ID. + + @return UINT32 value of APIC ID + +**/ +UINT32 +GetApicId ( + VOID + ) +{ + UINT32 ApicId; + BOOLEAN x2ApicEnabled; + UINT64 LocalApicBase; + + x2ApicEnabled = (BOOLEAN) (((AsmReadMsr64 (PcdGet16(XAPICBaseMsr))) & (0x0C00)) == 0x0C00); + if (x2ApicEnabled) { + ApicId = (UINT32) AsmReadMsr64 (PcdGet32(ExtXAPICLogicalAPICIdMsr)); + } else { + LocalApicBase = ((UINT32) AsmReadMsr64 (PcdGet16(XAPICBaseMsr))) & 0xFFFFF000; + ApicId = (UINT8) (*(volatile UINT32 *) (UINTN) (LocalApicBase + 0x20) >> 24); + } + + return ApicId; +}
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