1 files changed, 81 insertions, 0 deletions
diff --git a/roms/edk2/MdePkg/Library/BaseMemoryLib/SetMem.c b/roms/edk2/MdePkg/Library/BaseMemoryLib/SetMem.c
new file mode 100644
index 000000000..d42abb128
--- /dev/null
+++ b/roms/edk2/MdePkg/Library/BaseMemoryLib/SetMem.c
@@ -0,0 +1,81 @@
+/** @file
+  Implementation of the EfiSetMem 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 - 2010, 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"
+
+/**
+  Set Buffer to Value for Size bytes.
+
+  @param  Buffer   The memory to set.
+  @param  Length   The number of bytes to set.
+  @param  Value    The value of the set operation.
+
+  @return Buffer
+
+**/
+VOID *
+EFIAPI
+InternalMemSetMem (
+  OUT     VOID                      *Buffer,
+  IN      UINTN                     Length,
+  IN      UINT8                     Value
+  )
+{
+  //
+  // Declare the local variables that actually move the data elements as
+  // volatile to prevent the optimizer from replacing this function with
+  // the intrinsic memset()
+  //
+  volatile UINT8                    *Pointer8;
+  volatile UINT32                   *Pointer32;
+  volatile UINT64                   *Pointer64;
+  UINT32                            Value32;
+  UINT64                            Value64;
+
+  if ((((UINTN)Buffer & 0x7) == 0) && (Length >= 8)) {
+    // Generate the 64bit value
+    Value32 = (Value << 24) | (Value << 16) | (Value << 8) | Value;
+    Value64 = LShiftU64 (Value32, 32) | Value32;
+
+    Pointer64 = (UINT64*)Buffer;
+    while (Length >= 8) {
+      *(Pointer64++) = Value64;
+      Length -= 8;
+    }
+
+    // Finish with bytes if needed
+    Pointer8 = (UINT8*)Pointer64;
+  } else if ((((UINTN)Buffer & 0x3) == 0) && (Length >= 4)) {
+    // Generate the 32bit value
+    Value32 = (Value << 24) | (Value << 16) | (Value << 8) | Value;
+
+    Pointer32 = (UINT32*)Buffer;
+    while (Length >= 4) {
+      *(Pointer32++) = Value32;
+      Length -= 4;
+    }
+
+    // Finish with bytes if needed
+    Pointer8 = (UINT8*)Pointer32;
+  } else {
+    Pointer8 = (UINT8*)Buffer;
+  }
+  while (Length-- > 0) {
+    *(Pointer8++) = Value;
+  }
+  return Buffer;
+}