2016-06-08 11:02:21 +02:00
|
|
|
;; @file
|
|
|
|
|
; This is the code that goes from real-mode to protected mode.
|
|
|
|
|
; It consumes the reset vector, configures the stack.
|
|
|
|
|
;
|
2022-04-15 10:37:36 +02:00
|
|
|
; Copyright (c) 2015 - 2022, Intel Corporation. All rights reserved.<BR>
|
2019-04-04 01:04:04 +02:00
|
|
|
; SPDX-License-Identifier: BSD-2-Clause-Patent
|
2016-06-08 11:02:21 +02:00
|
|
|
;;
|
|
|
|
|
|
|
|
|
|
;
|
|
|
|
|
; Define assembler characteristics
|
|
|
|
|
;
|
|
|
|
|
|
|
|
|
|
extern ASM_PFX(TempRamInitApi)
|
|
|
|
|
|
|
|
|
|
SECTION .text
|
|
|
|
|
|
|
|
|
|
%macro RET_ESI 0
|
|
|
|
|
|
2022-04-15 10:37:36 +02:00
|
|
|
movd esi, mm7 ; restore EIP from MM7
|
2016-06-08 11:02:21 +02:00
|
|
|
jmp esi
|
|
|
|
|
|
|
|
|
|
%endmacro
|
|
|
|
|
|
|
|
|
|
;
|
|
|
|
|
; Perform early platform initialization
|
|
|
|
|
;
|
|
|
|
|
global ASM_PFX(SecPlatformInit)
|
|
|
|
|
ASM_PFX(SecPlatformInit):
|
|
|
|
|
|
|
|
|
|
RET_ESI
|
|
|
|
|
|
|
|
|
|
;
|
|
|
|
|
; Protected mode portion initializes stack, configures cache, and calls C entry point
|
|
|
|
|
;
|
|
|
|
|
|
|
|
|
|
;----------------------------------------------------------------------------
|
|
|
|
|
;
|
|
|
|
|
; Procedure: ProtectedModeEntryPoint
|
|
|
|
|
;
|
|
|
|
|
; Input: Executing in 32 Bit Protected (flat) mode
|
|
|
|
|
; cs: 0-4GB
|
|
|
|
|
; ds: 0-4GB
|
|
|
|
|
; es: 0-4GB
|
|
|
|
|
; fs: 0-4GB
|
|
|
|
|
; gs: 0-4GB
|
|
|
|
|
; ss: 0-4GB
|
|
|
|
|
;
|
|
|
|
|
; Output: This function never returns
|
|
|
|
|
;
|
|
|
|
|
; Destroys:
|
|
|
|
|
; ecx
|
|
|
|
|
; edi
|
|
|
|
|
; esi
|
|
|
|
|
; esp
|
|
|
|
|
;
|
|
|
|
|
; Description:
|
2019-07-11 10:54:31 +02:00
|
|
|
; Perform any essential early platform initialisation
|
2016-06-08 11:02:21 +02:00
|
|
|
; Setup a stack
|
|
|
|
|
;
|
|
|
|
|
;----------------------------------------------------------------------------
|
|
|
|
|
global ASM_PFX(ProtectedModeEntryPoint)
|
|
|
|
|
ASM_PFX(ProtectedModeEntryPoint):
|
|
|
|
|
;
|
|
|
|
|
; Dummy function. Consume 2 API to make sure they can be linked.
|
|
|
|
|
;
|
|
|
|
|
mov eax, ASM_PFX(TempRamInitApi)
|
|
|
|
|
|
|
|
|
|
; Should never return
|
|
|
|
|
jmp $
|
|
|
|
|
|
|
|
|
|
;
|
|
|
|
|
; ROM-based Global-Descriptor Table for the PEI Phase
|
|
|
|
|
;
|
|
|
|
|
align 16
|
|
|
|
|
global ASM_PFX(BootGdtTable)
|
|
|
|
|
|
|
|
|
|
;
|
|
|
|
|
; GDT[0]: 0x00: Null entry, never used.
|
|
|
|
|
;
|
|
|
|
|
NULL_SEL equ $ - GDT_BASE ; Selector [0]
|
|
|
|
|
GDT_BASE:
|
|
|
|
|
ASM_PFX(BootGdtTable): DD 0
|
|
|
|
|
DD 0
|
|
|
|
|
;
|
|
|
|
|
; Linear code segment descriptor
|
|
|
|
|
;
|
|
|
|
|
LINEAR_CODE_SEL equ $ - GDT_BASE ; Selector [0x8]
|
|
|
|
|
DW 0FFFFh ; limit 0xFFFF
|
|
|
|
|
DW 0 ; base 0
|
|
|
|
|
DB 0
|
|
|
|
|
DB 09Bh ; present, ring 0, data, expand-up, not-writable
|
|
|
|
|
DB 0CFh ; page-granular, 32-bit
|
|
|
|
|
DB 0
|
|
|
|
|
;
|
|
|
|
|
; System data segment descriptor
|
|
|
|
|
;
|
|
|
|
|
SYS_DATA_SEL equ $ - GDT_BASE ; Selector [0x10]
|
|
|
|
|
DW 0FFFFh ; limit 0xFFFF
|
|
|
|
|
DW 0 ; base 0
|
|
|
|
|
DB 0
|
|
|
|
|
DB 093h ; present, ring 0, data, expand-up, not-writable
|
|
|
|
|
DB 0CFh ; page-granular, 32-bit
|
|
|
|
|
DB 0
|
|
|
|
|
|
|
|
|
|
GDT_SIZE EQU $ - GDT_BASE ; Size, in bytes
|
|
|
|
|
|
|
|
|
|
;
|
|
|
|
|
; GDT Descriptor
|
|
|
|
|
;
|
|
|
|
|
GdtDesc: ; GDT descriptor
|
|
|
|
|
DW GDT_SIZE - 1 ; GDT limit
|
|
|
|
|
DD GDT_BASE ; GDT base address
|
|
|
|
|
|
|
|
|
|
global ASM_PFX(ProtectedModeEntryLinearAddress)
|
|
|
|
|
global ASM_PFX(ProtectedModeEntryLinearOffset)
|
|
|
|
|
|
|
|
|
|
ASM_PFX(ProtectedModeEntryLinearAddress):
|
|
|
|
|
ASM_PFX(ProtectedModeEntryLinearOffset):
|
|
|
|
|
DD ASM_PFX(ProtectedModeEntryPoint) ; Offset of our 32 bit code
|
|
|
|
|
DW LINEAR_CODE_SEL
|
2018-06-27 15:07:04 +02:00
|
|
|
|
