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|
;; @file
; Provide FSP API entry points.
;
; Copyright (c) 2016 - 2019, Intel Corporation. All rights reserved.<BR>
; SPDX-License-Identifier: BSD-2-Clause-Patent
;;
SECTION .text
;
; Following are fixed PCDs
;
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 {
.FspUpdHeader: resd 8
; }
; FSPM_ARCH_UPD {
.Revision: resb 1
.Reserved: resb 3
.NvsBufferPtr: resd 1
.StackBase: resd 1
.StackSize: resd 1
.BootLoaderTolumSize: resd 1
.BootMode: resd 1
.Reserved1: resb 8
; }
.size:
endstruc
;
; Following functions will be provided in C
;
extern ASM_PFX(SecStartup)
extern ASM_PFX(FspApiCommon)
;
; Following functions will be provided in PlatformSecLib
;
extern ASM_PFX(AsmGetFspBaseAddress)
extern ASM_PFX(AsmGetFspInfoHeader)
API_PARAM1_OFFSET EQU 34h ; ApiParam1 [ sub esp,8 + pushad + pushfd + push eax + call]
FSP_HEADER_IMGBASE_OFFSET EQU 1Ch
FSP_HEADER_CFGREG_OFFSET EQU 24h
;----------------------------------------------------------------------------
; FspMemoryInit API
;
; This FSP API is called after TempRamInit and initializes the memory.
;
;----------------------------------------------------------------------------
global ASM_PFX(FspMemoryInitApi)
ASM_PFX(FspMemoryInitApi):
mov eax, 3 ; FSP_API_INDEX.FspMemoryInitApiIndex
jmp ASM_PFX(FspApiCommon)
;----------------------------------------------------------------------------
; TempRamExitApi API
;
; This API tears down temporary RAM
;
;----------------------------------------------------------------------------
global ASM_PFX(TempRamExitApi)
ASM_PFX(TempRamExitApi):
mov eax, 4 ; FSP_API_INDEX.TempRamExitApiIndex
jmp ASM_PFX(FspApiCommon)
;----------------------------------------------------------------------------
; FspApiCommonContinue API
;
; This is the FSP API common entry point to resume the FSP execution
;
;----------------------------------------------------------------------------
global ASM_PFX(FspApiCommonContinue)
ASM_PFX(FspApiCommonContinue):
;
; EAX holds the API index
;
;
; FspMemoryInit API setup the initial stack frame
;
;
; Place holder to store the FspInfoHeader pointer
;
push eax
;
; Update the FspInfoHeader pointer
;
push eax
call ASM_PFX(AsmGetFspInfoHeader)
mov [esp + 4], eax
pop eax
;
; Create a Task Frame in the stack for the Boot Loader
;
pushfd ; 2 pushf for 4 byte alignment
cli
pushad
; Reserve 8 bytes for IDT save/restore
sub esp, 8
sidt [esp]
; Get Stackbase and StackSize from FSPM_UPD Param
mov edx, [esp + API_PARAM1_OFFSET]
cmp edx, 0
jnz FspStackSetup
; Get UPD default values if FspmUpdDataPtr (ApiParam1) is null
push eax
call ASM_PFX(AsmGetFspInfoHeader)
mov edx, [eax + FSP_HEADER_IMGBASE_OFFSET]
add edx, [eax + FSP_HEADER_CFGREG_OFFSET]
pop eax
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
;
; 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
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
;
push eax
;
; Pass the BootLoader stack to SecStartup
;
push edi
;
; Pass entry point of the PEI core
;
call ASM_PFX(AsmGetFspBaseAddress)
mov edi, eax
call ASM_PFX(AsmGetPeiCoreOffset)
add edi, eax
push edi
;
; Pass BFV into the PEI Core
; It uses relative address to calculate the actual boot FV base
; For FSP implementation with single FV, PcdFspBootFirmwareVolumeBase and
; PcdFspAreaBaseAddress are the same. For FSP with multiple FVs,
; they are different. The code below can handle both cases.
;
call ASM_PFX(AsmGetFspBaseAddress)
push eax
;
; Pass stack base and size into the PEI Core
;
push ebx
push ecx
;
; Pass Control into the PEI Core
;
call ASM_PFX(SecStartup)
add esp, 4
exit:
ret
global ASM_PFX(FspPeiCoreEntryOff)
ASM_PFX(FspPeiCoreEntryOff):
;
; This value will be pached by the build script
;
DD 0x12345678
global ASM_PFX(AsmGetPeiCoreOffset)
ASM_PFX(AsmGetPeiCoreOffset):
mov eax, dword [ASM_PFX(FspPeiCoreEntryOff)]
ret
;----------------------------------------------------------------------------
; TempRamInit API
;
; Empty function for WHOLEARCHIVE build option
;
;----------------------------------------------------------------------------
global ASM_PFX(TempRamInitApi)
ASM_PFX(TempRamInitApi):
jmp $
ret
;----------------------------------------------------------------------------
; Module Entrypoint API
;----------------------------------------------------------------------------
global ASM_PFX(_ModuleEntryPoint)
ASM_PFX(_ModuleEntryPoint):
jmp $
|
