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/Ia32/Stack.nasm | |
| parent | e02cda008591317b1625707ff8e115a4841aa889 (diff) | |
Change-Id: Iaf8d18082d3991dec7c0ebbea540f092188eb4ec
Diffstat (limited to 'roms/edk2/IntelFsp2Pkg/Library/BaseFspSwitchStackLib/Ia32/Stack.nasm')
| -rw-r--r-- | roms/edk2/IntelFsp2Pkg/Library/BaseFspSwitchStackLib/Ia32/Stack.nasm | 68 |
1 files changed, 68 insertions, 0 deletions
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
+
|