From af1a266670d040d2f4083ff309d732d648afba2a Mon Sep 17 00:00:00 2001
From: Angelos Mouzakitis <a.mouzakitis@virtualopensystems.com>
Date: Tue, 10 Oct 2023 14:33:42 +0000
Subject: Add submodule dependency files

Change-Id: Iaf8d18082d3991dec7c0ebbea540f092188eb4ec
---
 roms/edk2/MdePkg/Library/BaseMemoryLib/CopyMem.c | 148 +++++++++++++++++++++++
 1 file changed, 148 insertions(+)
 create mode 100644 roms/edk2/MdePkg/Library/BaseMemoryLib/CopyMem.c

(limited to 'roms/edk2/MdePkg/Library/BaseMemoryLib/CopyMem.c')

diff --git a/roms/edk2/MdePkg/Library/BaseMemoryLib/CopyMem.c b/roms/edk2/MdePkg/Library/BaseMemoryLib/CopyMem.c
new file mode 100644
index 000000000..55e8616c9
--- /dev/null
+++ b/roms/edk2/MdePkg/Library/BaseMemoryLib/CopyMem.c
@@ -0,0 +1,148 @@
+/** @file
+  Implementation of the InternalMemCopyMem routine. This function is broken
+  out into its own source file so that it can be excluded from a build for a
+  particular platform easily if an optimized version is desired.
+
+  Copyright (c) 2006 - 2016, Intel Corporation. All rights reserved.<BR>
+  Copyright (c) 2012 - 2013, ARM Ltd. All rights reserved.<BR>
+  Copyright (c) 2016, Linaro Ltd. All rights reserved.<BR>
+
+  SPDX-License-Identifier: BSD-2-Clause-Patent
+
+**/
+
+
+
+
+#include "MemLibInternals.h"
+
+/**
+  Copy Length bytes from Source to Destination.
+
+  @param  DestinationBuffer The target of the copy request.
+  @param  SourceBuffer      The place to copy from.
+  @param  Length            The number of bytes to copy.
+
+  @return Destination
+
+**/
+VOID *
+EFIAPI
+InternalMemCopyMem (
+  OUT     VOID                      *DestinationBuffer,
+  IN      CONST VOID                *SourceBuffer,
+  IN      UINTN                     Length
+  )
+{
+  //
+  // Declare the local variables that actually move the data elements as
+  // volatile to prevent the optimizer from replacing this function with
+  // the intrinsic memcpy()
+  //
+  volatile UINT8                    *Destination8;
+  CONST UINT8                       *Source8;
+  volatile UINT32                   *Destination32;
+  CONST UINT32                      *Source32;
+  volatile UINT64                   *Destination64;
+  CONST UINT64                      *Source64;
+  UINTN                             Alignment;
+
+  if ((((UINTN)DestinationBuffer & 0x7) == 0) && (((UINTN)SourceBuffer & 0x7) == 0) && (Length >= 8)) {
+    if (SourceBuffer > DestinationBuffer) {
+      Destination64 = (UINT64*)DestinationBuffer;
+      Source64 = (CONST UINT64*)SourceBuffer;
+      while (Length >= 8) {
+        *(Destination64++) = *(Source64++);
+        Length -= 8;
+      }
+
+      // Finish if there are still some bytes to copy
+      Destination8 = (UINT8*)Destination64;
+      Source8 = (CONST UINT8*)Source64;
+      while (Length-- != 0) {
+        *(Destination8++) = *(Source8++);
+      }
+    } else if (SourceBuffer < DestinationBuffer) {
+      Destination64 = (UINT64*)((UINTN)DestinationBuffer + Length);
+      Source64 = (CONST UINT64*)((UINTN)SourceBuffer + Length);
+
+      // Destination64 and Source64 were aligned on a 64-bit boundary
+      // but if length is not a multiple of 8 bytes then they won't be
+      // anymore.
+
+      Alignment = Length & 0x7;
+      if (Alignment != 0) {
+        Destination8 = (UINT8*)Destination64;
+        Source8 = (CONST UINT8*)Source64;
+
+        while (Alignment-- != 0) {
+          *(--Destination8) = *(--Source8);
+          --Length;
+        }
+        Destination64 = (UINT64*)Destination8;
+        Source64 = (CONST UINT64*)Source8;
+      }
+
+      while (Length > 0) {
+        *(--Destination64) = *(--Source64);
+        Length -= 8;
+      }
+    }
+  } else if ((((UINTN)DestinationBuffer & 0x3) == 0) && (((UINTN)SourceBuffer & 0x3) == 0) && (Length >= 4)) {
+    if (SourceBuffer > DestinationBuffer) {
+      Destination32 = (UINT32*)DestinationBuffer;
+      Source32 = (CONST UINT32*)SourceBuffer;
+      while (Length >= 4) {
+        *(Destination32++) = *(Source32++);
+        Length -= 4;
+      }
+
+      // Finish if there are still some bytes to copy
+      Destination8 = (UINT8*)Destination32;
+      Source8 = (CONST UINT8*)Source32;
+      while (Length-- != 0) {
+        *(Destination8++) = *(Source8++);
+      }
+    } else if (SourceBuffer < DestinationBuffer) {
+      Destination32 = (UINT32*)((UINTN)DestinationBuffer + Length);
+      Source32 = (CONST UINT32*)((UINTN)SourceBuffer + Length);
+
+      // Destination32 and Source32 were aligned on a 32-bit boundary
+      // but if length is not a multiple of 4 bytes then they won't be
+      // anymore.
+
+      Alignment = Length & 0x3;
+      if (Alignment != 0) {
+        Destination8 = (UINT8*)Destination32;
+        Source8 = (CONST UINT8*)Source32;
+
+        while (Alignment-- != 0) {
+          *(--Destination8) = *(--Source8);
+          --Length;
+        }
+        Destination32 = (UINT32*)Destination8;
+        Source32 = (CONST UINT32*)Source8;
+      }
+
+      while (Length > 0) {
+        *(--Destination32) = *(--Source32);
+        Length -= 4;
+      }
+    }
+  } else {
+    if (SourceBuffer > DestinationBuffer) {
+      Destination8 = (UINT8*)DestinationBuffer;
+      Source8 = (CONST UINT8*)SourceBuffer;
+      while (Length-- != 0) {
+        *(Destination8++) = *(Source8++);
+      }
+    } else if (SourceBuffer < DestinationBuffer) {
+      Destination8 = (UINT8*)DestinationBuffer + (Length - 1);
+      Source8 = (CONST UINT8*)SourceBuffer + (Length - 1);
+      while (Length-- != 0) {
+        *(Destination8--) = *(Source8--);
+      }
+    }
+  }
+  return DestinationBuffer;
+}
-- 
cgit