Moved the MdePkg to OldMdePkg so that new code in MdePkg does not break existing...

[mirror_edk2.git] / OldMdePkg / Library / BaseLib / x86FxRestore.c

diff --git a/OldMdePkg/Library/BaseLib/x86FxRestore.c b/OldMdePkg/Library/BaseLib/x86FxRestore.c
new file mode 100644 (file)
index 0000000..70a0c24
--- /dev/null
+++ b/OldMdePkg/Library/BaseLib/x86FxRestore.c
@@ -0,0 +1,48 @@
+/** @file\r
+  IA-32/x64 AsmFxRestore()\r
+\r
+  Copyright (c) 2006, Intel Corporation<BR>\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:  x86FxRestore.c\r
+\r
+**/\r
+\r
+#include "BaseLibInternals.h"\r
+\r
+/**\r
+  Restores the current floating point/SSE/SSE2 context from a buffer.\r
+\r
+  Restores the current floating point/SSE/SSE2 state from the buffer specified\r
+  by Buffer. Buffer must be aligned on a 16-byte boundary. This function is\r
+  only available on IA-32 and X64.\r
+\r
+  If Buffer is NULL, then ASSERT().\r
+  If Buffer is not aligned on a 16-byte boundary, then ASSERT().\r
+  If Buffer was not saved with AsmFxSave(), then ASSERT().\r
+\r
+  @param  Buffer  Pointer to a buffer to save the floating point/SSE/SSE2 context.\r
+\r
+**/\r
+VOID\r
+EFIAPI\r
+AsmFxRestore (\r
+  IN CONST IA32_FX_BUFFER  *Buffer\r
+  )\r
+{\r
+  ASSERT (Buffer != NULL);\r
+  ASSERT (((UINTN)Buffer & 0xf) == 0);\r
+\r
+  //\r
+  // Check the flag recorded by AsmFxSave()\r
+  //\r
+  ASSERT (*(UINT32 *) (&Buffer[sizeof (IA32_FX_BUFFER) - 4]) == 0xAA5555AA);\r
+\r
+  InternalX86FxRestore (Buffer);\r
+}\r