IntelFsp2Pkg/FspSecCore/Ia32/FspApiEntryCommon.nasm

   1 ;; @file
   2 ;  Provide FSP API entry points.
   3 ;
   4 ; Copyright (c) 2016, Intel Corporation. All rights reserved.<BR>
   5 ; This program and the accompanying materials
   6 ; are licensed and made available under the terms and conditions of the BSD License
   7 ; which accompanies this distribution.  The full text of the license may be found at
   8 ; http://opensource.org/licenses/bsd-license.php.
   9 ;
  10 ; THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  11 ; WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  12 ;;
  13
  14     SECTION .text
  15
  16 ;
  17 ; Following functions will be provided in C
  18 ;
  19 extern ASM_PFX(Loader2PeiSwitchStack)
  20 extern ASM_PFX(FspApiCallingCheck)
  21
  22 ;
  23 ; Following functions will be provided in ASM
  24 ;
  25 extern ASM_PFX(FspApiCommonContinue)
  26 extern ASM_PFX(AsmGetFspInfoHeader)
  27
  28 ;----------------------------------------------------------------------------
  29 ; FspApiCommon API
  30 ;
  31 ; This is the FSP API common entry point to resume the FSP execution
  32 ;
  33 ;----------------------------------------------------------------------------
  34 global ASM_PFX(FspApiCommon)
  35 ASM_PFX(FspApiCommon):
  36   ;
  37   ; EAX holds the API index
  38   ;
  39
  40   ;
  41   ; Stack must be ready
  42   ;
  43   push   eax
  44   add    esp, 4
  45   cmp    eax, dword  [esp - 4]
  46   jz     FspApiCommon1
  47   mov    eax, 080000003h
  48   jmp    exit
  49
  50 FspApiCommon1:
  51   ;
  52   ; Verify the calling condition
  53   ;
  54   pushad
  55   push   DWORD [esp + (4 * 8 + 4)]  ; push ApiParam
  56   push   eax                ; push ApiIdx
  57   call   ASM_PFX(FspApiCallingCheck)
  58   add    esp, 8
  59   cmp    eax, 0
  60   jz     FspApiCommon2
  61   mov    dword  [esp + (4 * 7)], eax
  62   popad
  63 exit:
  64   ret
  65
  66 FspApiCommon2:
  67   popad
  68   cmp    eax, 3   ; FspMemoryInit API
  69   jz     FspApiCommon3
  70
  71   call   ASM_PFX(AsmGetFspInfoHeader)
  72   jmp    ASM_PFX(Loader2PeiSwitchStack)
  73
  74 FspApiCommon3:
  75   jmp    ASM_PFX(FspApiCommonContinue)
  76