diff options
Diffstat (limited to 'IntelFsp2Pkg/FspSecCore/Ia32/FspApiEntryM.nasm')
| -rw-r--r-- | IntelFsp2Pkg/FspSecCore/Ia32/FspApiEntryM.nasm | 52 |
1 files changed, 46 insertions, 6 deletions
diff --git a/IntelFsp2Pkg/FspSecCore/Ia32/FspApiEntryM.nasm b/IntelFsp2Pkg/FspSecCore/Ia32/FspApiEntryM.nasm index 9c9a84db0a..916ad4ff0d 100644 --- a/IntelFsp2Pkg/FspSecCore/Ia32/FspApiEntryM.nasm +++ b/IntelFsp2Pkg/FspSecCore/Ia32/FspApiEntryM.nasm @@ -1,7 +1,7 @@ ;; @file
; Provide FSP API entry points.
;
-; Copyright (c) 2016 - 2018, Intel Corporation. All rights reserved.<BR>
+; Copyright (c) 2016 - 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
@@ -19,6 +19,7 @@ extern ASM_PFX(PcdGet32(PcdTemporaryRamBase))
extern ASM_PFX(PcdGet32(PcdTemporaryRamSize))
extern ASM_PFX(PcdGet32(PcdFspTemporaryRamSize))
+extern ASM_PFX(PcdGet8 (PcdFspHeapSizePercentage))
struc FSPM_UPD_COMMON
; FSP_UPD_HEADER {
@@ -128,15 +129,55 @@ ASM_PFX(FspApiCommonContinue): add edx, [eax + FSP_HEADER_CFGREG_OFFSET]
pop eax
- FspStackSetup:
+FspStackSetup:
+ ;
+ ; StackBase = temp memory base, StackSize = temp memory size
+ ;
mov edi, [edx + FSPM_UPD_COMMON.StackBase]
mov ecx, [edx + FSPM_UPD_COMMON.StackSize]
+
+ ;
+ ; Keep using bootloader stack if heap size % is 0
+ ;
+ mov bl, BYTE [ASM_PFX(PcdGet8 (PcdFspHeapSizePercentage))]
+ cmp bl, 0
+ jz SkipStackSwitch
+
+ ;
+ ; Set up a dedicated temp ram stack for FSP if FSP heap size % doesn't equal 0
+ ;
add edi, ecx
;
- ; Setup new FSP stack
+ ; Switch to new FSP stack
;
- xchg edi, esp ; Exchange edi and esp, edi will be assigned to the current esp pointer and esp will be Stack base + Stack size
- mov ebx, esp ; Put Stack base + Stack size in ebx
+ xchg edi, esp ; Exchange edi and esp, edi will be assigned to the current esp pointer and esp will be Stack base + Stack size
+
+SkipStackSwitch:
+ ;
+ ; If heap size % is 0:
+ ; EDI is FSPM_UPD_COMMON.StackBase and will hold ESP later (boot loader stack pointer)
+ ; ECX is FSPM_UPD_COMMON.StackSize
+ ; ESP is boot loader stack pointer (no stack switch)
+ ; BL is 0 to indicate no stack switch (EBX will hold FSPM_UPD_COMMON.StackBase later)
+ ;
+ ; If heap size % is not 0
+ ; EDI is boot loader stack pointer
+ ; ECX is FSPM_UPD_COMMON.StackSize
+ ; ESP is new stack (FSPM_UPD_COMMON.StackBase + FSPM_UPD_COMMON.StackSize)
+ ; BL is NOT 0 to indicate stack has switched
+ ;
+ cmp bl, 0
+ jnz StackHasBeenSwitched
+
+ mov ebx, edi ; Put FSPM_UPD_COMMON.StackBase to ebx as temp memory base
+ mov edi, esp ; Put boot loader stack pointer to edi
+ jmp StackSetupDone
+
+StackHasBeenSwitched:
+ mov ebx, esp ; Put Stack base + Stack size in ebx
+ sub ebx, ecx ; Stack base + Stack size - Stack size as temp memory base
+
+StackSetupDone:
;
; Pass the API Idx to SecStartup
@@ -170,7 +211,6 @@ ASM_PFX(FspApiCommonContinue): ;
; Pass stack base and size into the PEI Core
;
- sub ebx, ecx ; Stack base + Stack size - Stack size
push ebx
push ecx
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