mirror of
https://github.com/CloverHackyColor/CloverBootloader.git
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6b33696c93
Signed-off-by: SergeySlice <sergey.slice@gmail.com>
288 lines
7.2 KiB
C
288 lines
7.2 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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SPDX-License-Identifier: BSD-2-Clause-Patent
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**/
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#include "MemLibInternals.h"
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/**
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Fills a target buffer with a 16-bit value, and returns the target buffer.
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@param Buffer The pointer to the target buffer to fill.
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@param Length The count of 16-bit value to fill.
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@param Value The value with which to fill Length bytes of Buffer.
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@return Buffer
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**/
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VOID *
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EFIAPI
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InternalMemSetMem16 (
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OUT 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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for (; Length != 0; Length--) {
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((UINT16*)Buffer)[Length - 1] = Value;
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}
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return Buffer;
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}
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/**
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Fills a target buffer with a 32-bit value, and returns the target buffer.
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@param Buffer The pointer to the target buffer to fill.
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@param Length The count of 32-bit value to fill.
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@param Value The value with which to fill Length bytes of Buffer.
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@return Buffer
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**/
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VOID *
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EFIAPI
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InternalMemSetMem32 (
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OUT 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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for (; Length != 0; Length--) {
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((UINT32*)Buffer)[Length - 1] = Value;
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}
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return Buffer;
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}
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/**
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Fills a target buffer with a 64-bit value, and returns the target buffer.
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@param Buffer The pointer to the target buffer to fill.
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@param Length The count of 64-bit value to fill.
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@param Value The value with which to fill Length bytes of Buffer.
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@return Buffer
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**/
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VOID *
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EFIAPI
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InternalMemSetMem64 (
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OUT 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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for (; Length != 0; Length--) {
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((UINT64*)Buffer)[Length - 1] = Value;
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}
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return Buffer;
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}
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/**
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Set Buffer to 0 for Size bytes.
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@param Buffer Memory to set.
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@param Length The number of bytes to set.
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@return Buffer
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**/
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VOID *
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EFIAPI
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InternalMemZeroMem (
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OUT VOID *Buffer,
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IN UINTN Length
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)
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{
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return InternalMemSetMem(Buffer, Length, 0);
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}
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/**
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Compares two memory buffers of a given length.
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@param DestinationBuffer The first memory buffer.
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@param SourceBuffer The second memory buffer.
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@param Length Length of DestinationBuffer and SourceBuffer memory
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regions to compare. Must be non-zero.
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@return 0 All Length bytes of the two buffers are identical.
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@retval Non-zero The first mismatched byte in SourceBuffer subtracted from the first
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mismatched byte in DestinationBuffer.
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**/
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INTN
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EFIAPI
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InternalMemCompareMem (
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IN CONST VOID *DestinationBuffer,
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IN CONST VOID *SourceBuffer,
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IN UINTN Length
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)
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{
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while ((--Length != 0) &&
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(*(INT8*)DestinationBuffer == *(INT8*)SourceBuffer)) {
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DestinationBuffer = (INT8*)DestinationBuffer + 1;
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SourceBuffer = (INT8*)SourceBuffer + 1;
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}
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return (INTN)*(UINT8*)DestinationBuffer - (INTN)*(UINT8*)SourceBuffer;
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}
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/**
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Scans a target buffer for an 8-bit value, and returns a pointer to the
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matching 8-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 8-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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InternalMemScanMem8 (
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IN CONST VOID *Buffer,
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IN UINTN Length,
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IN UINT8 Value
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)
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{
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CONST UINT8 *Pointer;
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Pointer = (CONST UINT8*)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 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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