EmbeddedPkg/PrePiHobListPointerLib: New interface to abstract the HobListPointer...

[mirror_edk2.git] / EmbeddedPkg / Library / PrePiHobListPointerLib / PrePiHobListPointer.c

diff --git a/EmbeddedPkg/Library/PrePiHobListPointerLib/PrePiHobListPointer.c b/EmbeddedPkg/Library/PrePiHobListPointerLib/PrePiHobListPointer.c
new file mode 100644 (file)
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--- /dev/null
+++ b/EmbeddedPkg/Library/PrePiHobListPointerLib/PrePiHobListPointer.c
@@ -0,0 +1,69 @@
+/** @file\r
+*\r
+*  Copyright (c) 2011, ARM Limited. All rights reserved.\r
+*  \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
+*\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
+**/\r
+\r
+#include <PiPei.h>\r
+#include <Library/PrePiHobListPointerLib.h>\r
+#include <Library/DebugLib.h>\r
+#include <Library/PcdLib.h>\r
+\r
+//
+// Have to use build system to set the original value in case we are running
+// from FLASH and globals don't work. So if you do a GetHobList() and gHobList
+// and gHobList is NULL the PCD default values are used.
+//
+VOID *gHobList = NULL;\r
+\r
+\r
+/**\r
+  Returns the pointer to the HOB list.\r
+\r
+  This function returns the pointer to first HOB in the list.\r
+\r
+  @return The pointer to the HOB list.\r
+\r
+**/\r
+VOID *\r
+EFIAPI\r
+PrePeiGetHobList (\r
+  VOID\r
+  )\r
+{\r
+  if (gHobList == NULL) {\r
+    return (VOID *)*(UINTN*)PcdGet32 (PcdPrePiHobBase);\r
+  } else {\r
+    return gHobList;\r
+  }\r
+}\r
+\r
+\r
+\r
+/**\r
+  Updates the pointer to the HOB list.\r
+\r
+  @param  HobList       Hob list pointer to store\r
+  \r
+**/\r
+EFI_STATUS\r
+EFIAPI\r
+PrePeiSetHobList (\r
+  IN  VOID      *HobList\r
+  )\r
+{\r
+  gHobList = HobList;\r
+  \r
+  //\r
+  // If this code is running from ROM this could fail\r
+  //\r
+  return (gHobList == HobList) ? EFI_SUCCESS: EFI_UNSUPPORTED;\r
+}\r