X86DisablePaging64.c File Reference

#include "BaseLibInternals.h"

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Functions
VOID EFIAPI	AsmDisablePaging64 (IN UINT16 Cs, IN UINT32 EntryPoint, IN UINT32 Context1 OPTIONAL, IN UINT32 Context2 OPTIONAL, IN UINT32 NewStack)

Detailed Description

IA-32/x64 AsmDisablePaging64()

Copyright (c) 2006 - 2008, Intel Corporation. All rights reserved.
SPDX-License-Identifier: BSD-2-Clause-Patent

Definition in file X86DisablePaging64.c.

Function Documentation

AsmDisablePaging64()

VOID EFIAPI AsmDisablePaging64	(	IN UINT16	Cs,
		IN UINT32	EntryPoint,
		IN UINT32 Context1	OPTIONAL,
		IN UINT32 Context2	OPTIONAL,
		IN UINT32	NewStack
	)

Disables the 64-bit paging mode on the CPU.

Disables the 64-bit paging mode on the CPU and returns to 32-bit protected mode. This function assumes the current execution mode is 64-paging mode. This function is only available on x64. After the 64-bit paging mode is disabled, control is transferred to the function specified by EntryPoint using the new stack specified by NewStack and passing in the parameters specified by Context1 and Context2. Context1 and Context2 are optional and may be 0. The function EntryPoint must never return.

If the current execution mode is not 64-bit paged mode, then ASSERT(). If EntryPoint is 0, then ASSERT(). If NewStack is 0, then ASSERT().

Parameters

Cs	The 16-bit selector to load in the CS before EntryPoint is called. The descriptor in the GDT that this selector references must be setup for 32-bit protected mode.
EntryPoint	The 64-bit virtual address of the function to call with the new stack after paging is disabled.
Context1	The 64-bit virtual address of the context to pass into the EntryPoint function as the first parameter after paging is disabled.
Context2	The 64-bit virtual address of the context to pass into the EntryPoint function as the second parameter after paging is disabled.
NewStack	The 64-bit virtual address of the new stack to use for the EntryPoint function after paging is disabled.

Definition at line 43 of file X86DisablePaging64.c.