Import some basic libraries instances for Mde Packages.

[mirror_edk2.git] / MdePkg / Library / BaseMemoryLibSse2 / Ia32 / CopyMem.S

diff --git a/MdePkg/Library/BaseMemoryLibSse2/Ia32/CopyMem.S b/MdePkg/Library/BaseMemoryLibSse2/Ia32/CopyMem.S
new file mode 100644 (file)
index 0000000..82a2b94
--- /dev/null
+++ b/MdePkg/Library/BaseMemoryLibSse2/Ia32/CopyMem.S
@@ -0,0 +1,90 @@
+//\r
+// Include common header file for this module.\r
+//\r
+#include "CommonHeader.h"\r
+\r
+#------------------------------------------------------------------------------\r
+#\r
+# Copyright (c) 2006, Intel Corporation\r
+# All rights reserved. This program and the accompanying materials\r
+# are licensed and made available under the terms and conditions of the BSD License\r
+# which accompanies this distribution.  The full text of the license may be found at\r
+# http://opensource.org/licenses/bsd-license.php\r
+#\r
+# THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r
+# WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r
+#\r
+# Module Name:\r
+#\r
+#   CopyMem.asm\r
+#\r
+# Abstract:\r
+#\r
+#   CopyMem function\r
+#\r
+# Notes:\r
+#\r
+#------------------------------------------------------------------------------\r
+\r
+.globl _InternalMemCopyMem\r
+\r
+#------------------------------------------------------------------------------\r
+#  VOID *\r
+#  EFIAPI\r
+#  InternalMemCopyMem (\r
+#    IN VOID   *Destination,\r
+#    IN VOID   *Source,\r
+#    IN UINTN  Count\r
+#    );\r
+#------------------------------------------------------------------------------\r
+_InternalMemCopyMem:\r
+    push    %esi\r
+    push    %edi\r
+    movl    16(%esp), %esi              # esi <- Source\r
+    movl    12(%esp), %edi              # edi <- Destination\r
+    movl    20(%esp), %edx              # edx <- Count\r
+    leal    -1(%esi,%edx,), %eax        # eax <- End of Source\r
+    cmpl    %edi, %esi\r
+    jae     L0\r
+    cmpl    %edi, %eax                  # Overlapped?\r
+    jae     L_CopyBackward               # Copy backward if overlapped\r
+L0:\r
+    xorl    %ecx, %ecx\r
+    subl    %edi, %ecx\r
+    andl    $15, %ecx                   # ecx + edi aligns on 16-byte boundary\r
+    jz      L1\r
+    cmpl    %edx, %ecx\r
+    cmova   %edx, %ecx\r
+    subl    %ecx, %edx                  # edx <- remaining bytes to copy\r
+    rep\r
+    movsb\r
+L1:\r
+    movl    %edx, %ecx\r
+    andl    $15, %edx\r
+    shrl    $4, %ecx                    # ecx <- # of DQwords to copy\r
+    jz      L_CopyBytes\r
+    addl    $-16, %esp\r
+    movdqu  %xmm0, (%esp)\r
+L2:\r
+    movdqu  (%esi), %xmm0\r
+    movntdq %xmm0, (%edi)\r
+    addl    $16, %esi\r
+    addl    $16, %edi\r
+    loop    L2\r
+    mfence\r
+    movdqu  (%esp),%xmm0\r
+    addl    $16, %esp                   # stack cleanup\r
+    jmp     L_CopyBytes\r
+L_CopyBackward:\r
+    movl    %eax, %esi                  # esi <- Last byte in Source\r
+    leal    -1(%edi,%edx,), %edi        # edi <- Last byte in Destination\r
+    std\r
+L_CopyBytes:\r
+    movl    %edx, %ecx\r
+    rep\r
+    movsb\r
+    cld\r
+    movl    12(%esp), %eax              # eax <- Destination as return value\r
+    pop     %edi\r
+    pop     %esi\r
+    ret\r