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