a37f660599
This adds ARM support to BaseMemoryLibOptDxe, partially based on the cortex-strings library (ScanMem) and the existing CopyMem() implementation from BaseMemoryLibStm in ArmPkg. All string routines are accelerated except ScanMem16, ScanMem32, ScanMem64 and IsZeroBuffer, which can wait for another day. (Very few occurrences exist in the codebase) Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Reviewed-by: Liming Gao <liming.gao@intel.com>
143 lines
3.7 KiB
C
143 lines
3.7 KiB
C
/** @file
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Architecture Independent Base Memory Library Implementation.
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The following BaseMemoryLib instances contain the same copy of this file:
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BaseMemoryLib
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PeiMemoryLib
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UefiMemoryLib
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Copyright (c) 2006 - 2016, Intel Corporation. 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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/**
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Scans a target buffer for a 16-bit value, and returns a pointer to the
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matching 16-bit value in the target buffer.
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@param Buffer The pointer to the target buffer to scan.
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@param Length The count of 16-bit value to scan. Must be non-zero.
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@param Value The value to search for in the target buffer.
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@return The pointer to the first occurrence, or NULL if not found.
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**/
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CONST VOID *
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EFIAPI
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InternalMemScanMem16 (
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IN CONST VOID *Buffer,
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IN UINTN Length,
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IN UINT16 Value
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)
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{
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CONST UINT16 *Pointer;
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Pointer = (CONST UINT16*)Buffer;
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do {
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if (*Pointer == Value) {
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return Pointer;
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}
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++Pointer;
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} while (--Length != 0);
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return NULL;
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}
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/**
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Scans a target buffer for a 32-bit value, and returns a pointer to the
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matching 32-bit value in the target buffer.
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@param Buffer The pointer to the target buffer to scan.
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@param Length The count of 32-bit value to scan. Must be non-zero.
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@param Value The value to search for in the target buffer.
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@return The pointer to the first occurrence, or NULL if not found.
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**/
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CONST VOID *
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EFIAPI
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InternalMemScanMem32 (
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IN CONST VOID *Buffer,
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IN UINTN Length,
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IN UINT32 Value
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)
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{
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CONST UINT32 *Pointer;
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Pointer = (CONST UINT32*)Buffer;
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do {
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if (*Pointer == Value) {
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return Pointer;
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}
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++Pointer;
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} while (--Length != 0);
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return NULL;
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}
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/**
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Scans a target buffer for a 64-bit value, and returns a pointer to the
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matching 64-bit value in the target buffer.
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@param Buffer The pointer to the target buffer to scan.
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@param Length The count of 64-bit value to scan. Must be non-zero.
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@param Value The value to search for in the target buffer.
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@return The pointer to the first occurrence, or NULL if not found.
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**/
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CONST VOID *
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EFIAPI
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InternalMemScanMem64 (
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IN CONST VOID *Buffer,
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IN UINTN Length,
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IN UINT64 Value
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)
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{
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CONST UINT64 *Pointer;
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Pointer = (CONST UINT64*)Buffer;
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do {
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if (*Pointer == Value) {
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return Pointer;
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}
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++Pointer;
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} while (--Length != 0);
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return NULL;
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}
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/**
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Checks whether the contents of a buffer are all zeros.
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@param Buffer The pointer to the buffer to be checked.
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@param Length The size of the buffer (in bytes) to be checked.
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@retval TRUE Contents of the buffer are all zeros.
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@retval FALSE Contents of the buffer are not all zeros.
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**/
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BOOLEAN
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EFIAPI
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InternalMemIsZeroBuffer (
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IN CONST VOID *Buffer,
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IN UINTN Length
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)
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{
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CONST UINT8 *BufferData;
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UINTN Index;
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BufferData = Buffer;
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for (Index = 0; Index < Length; Index++) {
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if (BufferData[Index] != 0) {
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return FALSE;
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}
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}
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return TRUE;
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}
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