MdePkg PeiMemoryAllocationLib: Update InternalAllocateAlignedPages

[mirror_edk2.git] / MdePkg / Library / BasePalLibNull / PalCall.c

diff --git a/MdePkg/Library/BasePalLibNull/PalCall.c b/MdePkg/Library/BasePalLibNull/PalCall.c
index 82db43cf65f7a3b8de11a1c68a0015c817b6214d..174c28ee67c0b7bab1982b4fa8e01a54ebe0ac32 100644 (file)
--- a/MdePkg/Library/BasePalLibNull/PalCall.c
+++ b/MdePkg/Library/BasePalLibNull/PalCall.c
@@ -2,11 +2,11 @@
   \r
   Template and Sample instance of PalCallLib.\r
   \r
-  Copyright (c) 2006 - 2008, Intel Corporation<BR>\r
-  All rights reserved. This program and the accompanying materials                          \r
+  Copyright (c) 2006 - 2010, Intel Corporation. All rights reserved.<BR>\r
+  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
+  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
@@ -20,16 +20,26 @@
 /**\r
   Makes a PAL procedure call.\r
 \r
-  This is a wrapper function to make a PAL procedure call.\r
-  This is just a template as simple instance. It does not\r
-  make real PAL call. It directly reports error if called.\r
-\r
-  @param  Index  The PAL procedure Index number.\r
-  @param  Arg2   The 2nd parameter for PAL procedure calls.\r
-  @param  Arg3   The 3rd parameter for PAL procedure calls.\r
-  @param  Arg4   The 4th parameter for PAL procedure calls.\r
-\r
-  @return Structure returned from the PAL Call procedure, including the status and return value.\r
+  This is a wrapper function to make a PAL procedure call.  Based on the Index value,\r
+  this API will make static or stacked PAL call. Architected procedures may be designated\r
+  as required or optional.  If a PAL procedure is specified as optional, a unique return\r
+  code of 0xFFFFFFFFFFFFFFFF is returned in the Status field of the PAL_CALL_RETURN structure.\r
+  This indicates that the procedure is not present in this PAL implementation.  It is the\r
+  caller's responsibility to check for this return code after calling any optional PAL\r
+  procedure. No parameter checking is performed on the 4 input parameters, but there are\r
+  some common rules that the caller should follow when making a PAL call.  Any address\r
+  passed to PAL as buffers for return parameters must be 8-byte aligned.  Unaligned addresses\r
+  may cause undefined results.  For those parameters defined as reserved or some fields\r
+  defined as reserved must be zero filled or the invalid argument return value may be\r
+  returned or undefined result may occur during the execution of the procedure.\r
+  This function is only available on IPF.\r
+\r
+  @param Index  The PAL procedure Index number.\r
+  @param Arg2   The 2nd parameter for PAL procedure calls.\r
+  @param Arg3   The 3rd parameter for PAL procedure calls.\r
+  @param Arg4   The 4th parameter for PAL procedure calls.\r
+\r
+  @return The structure returned from the PAL Call procedure, including the status and return value.\r
 \r
 **/\r
 PAL_CALL_RETURN\r