diff options
| author |   Angelos Mouzakitis <a.mouzakitis@virtualopensystems.com> | 2023-10-10 14:33:42 +0000 |
|---|---|---|
| committer | Angelos Mouzakitis <a.mouzakitis@virtualopensystems.com> | 2023-10-10 14:33:42 +0000 |
| commit | af1a266670d040d2f4083ff309d732d648afba2a (patch) | |
| tree | 2fc46203448ddcc6f81546d379abfaeb323575e9 /roms/edk2/IntelFsp2Pkg/Library/BaseFspSwitchStackLib | |
| parent | e02cda008591317b1625707ff8e115a4841aa889 (diff) | |
Change-Id: Iaf8d18082d3991dec7c0ebbea540f092188eb4ec
Diffstat (limited to 'roms/edk2/IntelFsp2Pkg/Library/BaseFspSwitchStackLib')
3 files changed, 137 insertions, 0 deletions
diff --git a/roms/edk2/IntelFsp2Pkg/Library/BaseFspSwitchStackLib/BaseFspSwitchStackLib.inf b/roms/edk2/IntelFsp2Pkg/Library/BaseFspSwitchStackLib/BaseFspSwitchStackLib.inf new file mode 100644 index 000000000..3dcf3b959 --- /dev/null +++ b/roms/edk2/IntelFsp2Pkg/Library/BaseFspSwitchStackLib/BaseFspSwitchStackLib.inf @@ -0,0 +1,33 @@ +## @file
+# Instance of BaseFspSwitchStackLib
+#
+# Copyright (c) 2014 - 2016, Intel Corporation. All rights reserved.<BR>
+#
+# SPDX-License-Identifier: BSD-2-Clause-Patent
+#
+##
+
+[Defines]
+ INF_VERSION = 0x00010005
+ BASE_NAME = BaseFspSwitchStackLib
+ FILE_GUID = 68E79161-F7CE-4A61-8C72-F4DF6FF35CAA
+ MODULE_TYPE = BASE
+ VERSION_STRING = 1.0
+ LIBRARY_CLASS = FspSwitchStackLib
+
+[Sources.IA32]
+ FspSwitchStackLib.c
+
+[Sources.IA32]
+ Ia32/Stack.nasm
+
+[Packages]
+ MdePkg/MdePkg.dec
+ IntelFsp2Pkg/IntelFsp2Pkg.dec
+
+[LibraryClasses]
+ BaseLib
+ IoLib
+
+
+
diff --git a/roms/edk2/IntelFsp2Pkg/Library/BaseFspSwitchStackLib/FspSwitchStackLib.c b/roms/edk2/IntelFsp2Pkg/Library/BaseFspSwitchStackLib/FspSwitchStackLib.c new file mode 100644 index 000000000..fd553db62 --- /dev/null +++ b/roms/edk2/IntelFsp2Pkg/Library/BaseFspSwitchStackLib/FspSwitchStackLib.c @@ -0,0 +1,36 @@ +/** @file
+
+ Copyright (c) 2014, Intel Corporation. All rights reserved.<BR>
+ SPDX-License-Identifier: BSD-2-Clause-Patent
+
+**/
+
+#include <Base.h>
+#include <Library/BaseLib.h>
+#include <Library/FspCommonLib.h>
+
+/**
+
+ Switch the current stack to the previous saved stack.
+
+ @param[in] NewStack The new stack to be switched.
+
+ @return OldStack After switching to the saved stack,
+ this value will be saved in eax before returning.
+
+
+**/
+UINT32
+SwapStack (
+ IN UINT32 NewStack
+ )
+{
+ FSP_GLOBAL_DATA *FspData;
+ UINT32 OldStack;
+
+ FspData = GetFspGlobalDataPointer ();
+ OldStack = FspData->CoreStack;
+ FspData->CoreStack = NewStack;
+ return OldStack;
+}
+
diff --git a/roms/edk2/IntelFsp2Pkg/Library/BaseFspSwitchStackLib/Ia32/Stack.nasm b/roms/edk2/IntelFsp2Pkg/Library/BaseFspSwitchStackLib/Ia32/Stack.nasm new file mode 100644 index 000000000..659990190 --- /dev/null +++ b/roms/edk2/IntelFsp2Pkg/Library/BaseFspSwitchStackLib/Ia32/Stack.nasm @@ -0,0 +1,68 @@ +;------------------------------------------------------------------------------
+;
+; Copyright (c) 2016 - 2019, Intel Corporation. All rights reserved.<BR>
+; SPDX-License-Identifier: BSD-2-Clause-Patent
+;
+; Abstract:
+;
+; Switch the stack from temporary memory to permanent memory.
+;
+;------------------------------------------------------------------------------
+
+ SECTION .text
+
+extern ASM_PFX(SwapStack)
+
+;------------------------------------------------------------------------------
+; UINT32
+; EFIAPI
+; Pei2LoaderSwitchStack (
+; VOID
+; )
+;------------------------------------------------------------------------------
+global ASM_PFX(Pei2LoaderSwitchStack)
+ASM_PFX(Pei2LoaderSwitchStack):
+ xor eax, eax
+ jmp ASM_PFX(FspSwitchStack)
+
+;------------------------------------------------------------------------------
+; UINT32
+; EFIAPI
+; Loader2PeiSwitchStack (
+; VOID
+; )
+;------------------------------------------------------------------------------
+global ASM_PFX(Loader2PeiSwitchStack)
+ASM_PFX(Loader2PeiSwitchStack):
+ jmp ASM_PFX(FspSwitchStack)
+
+;------------------------------------------------------------------------------
+; UINT32
+; EFIAPI
+; FspSwitchStack (
+; VOID
+; )
+;------------------------------------------------------------------------------
+global ASM_PFX(FspSwitchStack)
+ASM_PFX(FspSwitchStack):
+ ; Save current contexts
+ push eax
+ pushfd
+ cli
+ pushad
+ sub esp, 8
+ sidt [esp]
+
+ ; Load new stack
+ push esp
+ call ASM_PFX(SwapStack)
+ mov esp, eax
+
+ ; Restore previous contexts
+ lidt [esp]
+ add esp, 8
+ popad
+ popfd
+ add esp, 4
+ ret
+
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