IntelFsp2Pkg/FspSecCore/X64/Fsp24ApiEntryS.nasm

;; @file
;  Provide FSP API entry points.
;
; Copyright (c) 2022, Intel Corporation. All rights reserved.<BR>
; SPDX-License-Identifier: BSD-2-Clause-Patent
;;

    SECTION .text

;
; Following functions will be provided in C
;
extern ASM_PFX(FspApiCommon)
extern ASM_PFX(FspMultiPhaseSiInitApiHandlerV2)

STACK_SAVED_RAX_OFFSET       EQU   8 * 7 ; size of a general purpose register * rax index

;----------------------------------------------------------------------------
; NotifyPhase API
;
; This FSP API will notify the FSP about the different phases in the boot
; process
;
;----------------------------------------------------------------------------
global ASM_PFX(NotifyPhaseApi)
ASM_PFX(NotifyPhaseApi):
  mov    rax,  2 ; FSP_API_INDEX.NotifyPhaseApiIndex
  jmp    ASM_PFX(FspApiCommon)

;----------------------------------------------------------------------------
; FspSiliconInit API
;
; This FSP API initializes the CPU and the chipset including the IO
; controllers in the chipset to enable normal operation of these devices.
;
;----------------------------------------------------------------------------
global ASM_PFX(FspSiliconInitApi)
ASM_PFX(FspSiliconInitApi):
  mov    rax,  5 ; FSP_API_INDEX.FspSiliconInitApiIndex
  jmp    ASM_PFX(FspApiCommon)

;----------------------------------------------------------------------------
; FspMultiPhaseSiInitApi API
;
; This FSP API provides multi-phase silicon initialization, which brings greater
; modularity beyond the existing FspSiliconInit() API.
; Increased modularity is achieved by adding an extra API to FSP-S.
; This allows the bootloader to add board specific initialization steps throughout
; the SiliconInit flow as needed.
;
;----------------------------------------------------------------------------

%include    "PushPopRegsNasm.inc"

global ASM_PFX(FspMultiPhaseSiInitApi)
ASM_PFX(FspMultiPhaseSiInitApi):
  mov    rax,  6 ; FSP_API_INDEX.FspMultiPhaseSiInitApiIndex
  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):
  ;
  ; Handle FspMultiPhaseSiInitApiIndex API
  ;
  push   rdx    ; Push a QWORD data for stack alignment

  cmp    rax, 6 ; FSP_API_INDEX.FspMultiPhaseSiInitApiIndex
  jnz    NotMultiPhaseSiInitApi

  PUSHA_64
  mov    rdx, rcx           ; move ApiParam to rdx
  mov    rcx, rax           ; move ApiIdx to rcx
  sub    rsp, 0x20          ; calling C function may need shadow space
  call   ASM_PFX(FspMultiPhaseSiInitApiHandlerV2)
  add    rsp, 0x20          ; restore shadow space
  mov    qword  [rsp + STACK_SAVED_RAX_OFFSET], rax
  POPA_64
  add    rsp, 0x08
  ret

NotMultiPhaseSiInitApi:
  jmp $
  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 $