From 35897da27ed289f086d2b528800fa60d6ef2407d Mon Sep 17 00:00:00 2001
From: "Chasel, Chiu" <chasel.chiu@intel.com>
Date: Wed, 23 Jan 2019 12:07:45 +0800
Subject: IntelFsp2Pkg: Add function to get bootloader stack pointer

REF: https://bugzilla.tianocore.org/show_bug.cgi?id=1391

FSP on-going enhancement for stack utilization required
to know bootloader stack pointer and this pointer can be
retrieved by first input parameter address when FSP-M
entry API invoked by bootloader.

Test: Verified on internal platform and booting successfully

Cc: Nate DeSimone <nathaniel.l.desimone@intel.com>
Cc: Star Zeng <star.zeng@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Chasel Chiu <chasel.chiu@intel.com>
Reviewed-by: Star Zeng <star.zeng@intel.com>
Reviewed-by: Nate DeSimone <nathaniel.l.desimone@intel.com>
---
 .../Library/BaseFspCommonLib/FspCommonLib.c        | 27 ++++++++++++++++++----
 1 file changed, 22 insertions(+), 5 deletions(-)

(limited to 'IntelFsp2Pkg/Library/BaseFspCommonLib')

diff --git a/IntelFsp2Pkg/Library/BaseFspCommonLib/FspCommonLib.c b/IntelFsp2Pkg/Library/BaseFspCommonLib/FspCommonLib.c
index 64ffba1d16..5bec4f9f97 100644
--- a/IntelFsp2Pkg/Library/BaseFspCommonLib/FspCommonLib.c
+++ b/IntelFsp2Pkg/Library/BaseFspCommonLib/FspCommonLib.c
@@ -1,6 +1,6 @@
 /** @file
 
-  Copyright (c) 2014 - 2018, Intel Corporation. All rights reserved.<BR>
+  Copyright (c) 2014 - 2019, Intel Corporation. All rights reserved.<BR>
   This program and the accompanying materials
   are licensed and made available under the terms and conditions of the BSD License
   which accompanies this distribution.  The full text of the license may be found at
@@ -87,9 +87,9 @@ GetFspGlobalDataPointer (
 }
 
 /**
-  This function gets back the FSP API first parameter passed by the bootlaoder.
+  This function gets back the FSP API first parameter passed by the bootloader.
 
-  @retval ApiParameter FSP API first parameter passed by the bootlaoder.
+  @retval ApiParameter FSP API first parameter passed by the bootloader.
 **/
 UINT32
 EFIAPI
@@ -104,9 +104,26 @@ GetFspApiParameter (
 }
 
 /**
-  This function gets back the FSP API second parameter passed by the bootlaoder.
+  This function returns the FSP entry stack pointer from address of the first API parameter.
 
-  @retval ApiParameter FSP API second parameter passed by the bootlaoder.
+  @retval FSP entry stack pointer.
+**/
+VOID*
+EFIAPI
+GetFspEntryStack (
+  VOID
+  )
+{
+  FSP_GLOBAL_DATA  *FspData;
+
+  FspData  = GetFspGlobalDataPointer ();
+  return (VOID*)(FspData->CoreStack + CONTEXT_STACK_OFFSET(ApiParam[0]));
+}
+
+/**
+  This function gets back the FSP API second parameter passed by the bootloader.
+
+  @retval ApiParameter FSP API second parameter passed by the bootloader.
 **/
 UINT32
 EFIAPI
-- 
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