IntelFsp2Pkg SecFspSecPlatformLibNull: Convert Ia32/SecCarInit.asm to NASM

[mirror_edk2.git] / IntelFsp2Pkg / Library / SecFspSecPlatformLibNull / Ia32 / Flat32.asm

;; @file\r
;  This is the code that goes from real-mode to protected mode.\r
;  It consumes the reset vector, configures the stack.\r
;\r
; Copyright (c) 2015 - 2016, Intel Corporation. All rights reserved.<BR>\r
; This program and the accompanying materials\r
; are licensed and made available under the terms and conditions of the BSD License\r
; which accompanies this distribution.  The full text of the license may be found at\r
; http://opensource.org/licenses/bsd-license.php.\r
;\r
; THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r
; WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r
;;\r
\r
;\r
; Define assembler characteristics\r
;\r
.586p\r
.xmm\r
.model flat, c\r
\r
EXTRN   TempRamInitApi:NEAR\r
\r
.code \r
\r
RET_ESI  MACRO\r
\r
  movd    esi, mm7                      ; restore ESP from MM7\r
  jmp     esi\r
\r
ENDM\r
\r
;\r
; Perform early platform initialization\r
;\r
SecPlatformInit    PROC    NEAR    PUBLIC\r
\r
  RET_ESI\r
\r
SecPlatformInit    ENDP\r
\r
;\r
; Protected mode portion initializes stack, configures cache, and calls C entry point\r
;\r
\r
;----------------------------------------------------------------------------\r
;\r
; Procedure:    ProtectedModeEntryPoint\r
;\r
; Input:        Executing in 32 Bit Protected (flat) mode\r
;               cs: 0-4GB\r
;               ds: 0-4GB\r
;               es: 0-4GB\r
;               fs: 0-4GB\r
;               gs: 0-4GB\r
;               ss: 0-4GB\r
;\r
; Output:       This function never returns\r
;\r
; Destroys:\r
;               ecx\r
;               edi\r
;               esi\r
;               esp\r
;\r
; Description:\r
;               Perform any essential early platform initilaisation\r
;               Setup a stack\r
;\r
;----------------------------------------------------------------------------\r
\r
ProtectedModeEntryPoint PROC NEAR C PUBLIC\r
  ;\r
  ; Dummy function. Consume 2 API to make sure they can be linked.\r
  ;\r
  mov  eax, TempRamInitApi\r
\r
  ; Should never return\r
  jmp  $\r
\r
ProtectedModeEntryPoint ENDP\r
\r
;\r
; ROM-based Global-Descriptor Table for the PEI Phase\r
;\r
align 16\r
PUBLIC  BootGdtTable\r
\r
;\r
; GDT[0]: 0x00: Null entry, never used.\r
;\r
NULL_SEL        equ     $ - GDT_BASE        ; Selector [0]\r
GDT_BASE:\r
BootGdtTable    DD      0\r
                DD      0\r
;\r
; Linear code segment descriptor\r
;\r
LINEAR_CODE_SEL equ     $ - GDT_BASE        ; Selector [0x8]\r
        DW      0FFFFh                      ; limit 0xFFFF\r
        DW      0                           ; base 0\r
        DB      0\r
        DB      09Bh                        ; present, ring 0, data, expand-up, not-writable\r
        DB      0CFh                        ; page-granular, 32-bit\r
        DB      0\r
;\r
; System data segment descriptor\r
;\r
SYS_DATA_SEL    equ     $ - GDT_BASE        ; Selector [0x10]\r
        DW      0FFFFh                      ; limit 0xFFFF\r
        DW      0                           ; base 0\r
        DB      0\r
        DB      093h                        ; present, ring 0, data, expand-up, not-writable\r
        DB      0CFh                        ; page-granular, 32-bit\r
        DB      0\r
\r
GDT_SIZE        EQU     $ - BootGDTtable    ; Size, in bytes\r
\r
;\r
; GDT Descriptor\r
;\r
GdtDesc:                                    ; GDT descriptor\r
        DW      GDT_SIZE - 1                ; GDT limit\r
        DD      OFFSET BootGdtTable         ; GDT base address\r
\r
ProtectedModeEntryLinearAddress   LABEL   FWORD\r
ProtectedModeEntryLinearOffset    LABEL   DWORD\r
  DD      OFFSET ProtectedModeEntryPoint  ; Offset of our 32 bit code\r
  DW      LINEAR_CODE_SEL\r
  \r
END\r