217b3ac093
As reported by Vishal, CompareGuid() is a hotspot, and switching from BaseMemoryLibStm in ArmPkg/ to BaseMemoryLibOptDxe causes a noticeable performance regression due to the fact that BaseMemoryLibOptDxe uses unaligned accessors explicitly to implement CompareGuid() and the related functions. Since BaseMemoryLibOptDxe on ARM and AARCH64 can only be used in contexts where unaligned accesses are allowed, reimplement these functions for ARM and AARCH64 specifically, using wide accessors that can tolerate any misalignment. Reported-by: "Oliyil Kunnil, Vishal" <vishalo@qti.qualcomm.com> Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Reviewed-by: Liming Gao <liming.gao@intel.com>
153 lines
4.2 KiB
C
153 lines
4.2 KiB
C
/** @file
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Implementation of GUID functions for ARM and AARCH64
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Copyright (c) 2006 - 2016, Intel Corporation. All rights reserved.<BR>
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Copyright (c) 2016, Linaro Ltd. All rights reserved.<BR>
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This program and the accompanying materials
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are licensed and made available under the terms and conditions of the BSD License
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which accompanies this distribution. The full text of the license may be found at
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http://opensource.org/licenses/bsd-license.php.
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THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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**/
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#include "MemLibInternals.h"
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BOOLEAN
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EFIAPI
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InternalMemCompareGuid (
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IN CONST GUID *Guid1,
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IN CONST GUID *Guid2
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);
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/**
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Copies a source GUID to a destination GUID.
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This function copies the contents of the 128-bit GUID specified by SourceGuid to
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DestinationGuid, and returns DestinationGuid.
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If DestinationGuid is NULL, then ASSERT().
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If SourceGuid is NULL, then ASSERT().
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@param DestinationGuid The pointer to the destination GUID.
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@param SourceGuid The pointer to the source GUID.
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@return DestinationGuid.
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**/
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GUID *
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EFIAPI
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CopyGuid (
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OUT GUID *DestinationGuid,
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IN CONST GUID *SourceGuid
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)
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{
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ASSERT (DestinationGuid != NULL);
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ASSERT (SourceGuid != NULL);
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return InternalMemCopyMem (DestinationGuid, SourceGuid, sizeof (GUID));
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}
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/**
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Compares two GUIDs.
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This function compares Guid1 to Guid2. If the GUIDs are identical then TRUE is returned.
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If there are any bit differences in the two GUIDs, then FALSE is returned.
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If Guid1 is NULL, then ASSERT().
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If Guid2 is NULL, then ASSERT().
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@param Guid1 A pointer to a 128 bit GUID.
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@param Guid2 A pointer to a 128 bit GUID.
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@retval TRUE Guid1 and Guid2 are identical.
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@retval FALSE Guid1 and Guid2 are not identical.
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**/
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BOOLEAN
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EFIAPI
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CompareGuid (
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IN CONST GUID *Guid1,
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IN CONST GUID *Guid2
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)
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{
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ASSERT (Guid1 != NULL);
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ASSERT (Guid2 != NULL);
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return InternalMemCompareGuid (Guid1, Guid2);
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}
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/**
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Scans a target buffer for a GUID, and returns a pointer to the matching GUID
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in the target buffer.
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This function searches the target buffer specified by Buffer and Length from
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the lowest address to the highest address at 128-bit increments for the 128-bit
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GUID value that matches Guid. If a match is found, then a pointer to the matching
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GUID in the target buffer is returned. If no match is found, then NULL is returned.
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If Length is 0, then NULL is returned.
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If Length > 0 and Buffer is NULL, then ASSERT().
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If Buffer is not aligned on a 32-bit boundary, then ASSERT().
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If Length is not aligned on a 128-bit boundary, then ASSERT().
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If Length is greater than (MAX_ADDRESS - Buffer + 1), then ASSERT().
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@param Buffer The pointer to the target buffer to scan.
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@param Length The number of bytes in Buffer to scan.
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@param Guid The value to search for in the target buffer.
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@return A pointer to the matching Guid in the target buffer or NULL otherwise.
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**/
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VOID *
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EFIAPI
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ScanGuid (
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IN CONST VOID *Buffer,
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IN UINTN Length,
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IN CONST GUID *Guid
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)
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{
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CONST GUID *GuidPtr;
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ASSERT (((UINTN)Buffer & (sizeof (Guid->Data1) - 1)) == 0);
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ASSERT (Length <= (MAX_ADDRESS - (UINTN)Buffer + 1));
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ASSERT ((Length & (sizeof (*GuidPtr) - 1)) == 0);
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GuidPtr = (GUID*)Buffer;
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Buffer = GuidPtr + Length / sizeof (*GuidPtr);
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while (GuidPtr < (CONST GUID*)Buffer) {
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if (InternalMemCompareGuid (GuidPtr, Guid)) {
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return (VOID*)GuidPtr;
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}
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GuidPtr++;
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}
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return NULL;
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}
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/**
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Checks if the given GUID is a zero GUID.
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This function checks whether the given GUID is a zero GUID. If the GUID is
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identical to a zero GUID then TRUE is returned. Otherwise, FALSE is returned.
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If Guid is NULL, then ASSERT().
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@param Guid The pointer to a 128 bit GUID.
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@retval TRUE Guid is a zero GUID.
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@retval FALSE Guid is not a zero GUID.
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**/
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BOOLEAN
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EFIAPI
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IsZeroGuid (
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IN CONST GUID *Guid
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)
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{
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ASSERT (Guid != NULL);
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return InternalMemCompareGuid (Guid, NULL);
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}
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