mirror of
https://github.com/CloverHackyColor/CloverBootloader.git
synced 2024-12-01 12:53:27 +01:00
49 lines
1.4 KiB
NASM
49 lines
1.4 KiB
NASM
|
;------------------------------------------------------------------------------
|
||
|
|
;
|
||
|
|
; Copyright (c) 2006, Intel Corporation. All rights reserved.<BR>
|
||
|
|
; SPDX-License-Identifier: BSD-2-Clause-Patent
|
||
|
|
;
|
||
|
|
; Module Name:
|
||
|
|
;
|
||
|
|
; DisablePaging32.Asm
|
||
|
|
;
|
||
|
|
; Abstract:
|
||
|
|
;
|
||
|
|
; AsmDisablePaging32 function
|
||
|
|
;
|
||
|
|
; Notes:
|
||
|
|
;
|
||
|
|
;------------------------------------------------------------------------------
|
||
|
|
|
||
|
|
SECTION .text
|
||
|
|
|
||
|
|
;------------------------------------------------------------------------------
|
||
|
|
; VOID
|
||
|
|
; EFIAPI
|
||
|
|
; InternalX86DisablePaging32 (
|
||
|
|
; IN SWITCH_STACK_ENTRY_POINT EntryPoint,
|
||
|
|
; IN VOID *Context1, OPTIONAL
|
||
|
|
; IN VOID *Context2, OPTIONAL
|
||
|
|
; IN VOID *NewStack
|
||
|
|
; );
|
||
|
|
;------------------------------------------------------------------------------
|
||
|
|
global ASM_PFX(InternalX86DisablePaging32)
|
||
|
|
ASM_PFX(InternalX86DisablePaging32):
|
||
|
|
mov ebx, [esp + 4]
|
||
|
|
mov ecx, [esp + 8]
|
||
|
|
mov edx, [esp + 12]
|
||
|
|
pushfd
|
||
|
|
pop edi ; save EFLAGS to edi
|
||
|
|
cli
|
||
|
|
mov eax, cr0
|
||
|
|
btr eax, 31
|
||
|
|
mov esp, [esp + 16]
|
||
|
|
mov cr0, eax
|
||
|
|
push edi
|
||
|
|
popfd ; restore EFLAGS from edi
|
||
|
|
push edx
|
||
|
|
push ecx
|
||
|
|
call ebx
|
||
|
|
jmp $ ; EntryPoint() should not return
|
||
|
|
|