Non-existing.c File Reference

#include <Library/BaseLib.h>
#include <Library/DebugLib.h>

Go to the source code of this file.

Functions
VOID EFIAPI	InternalX86EnablePaging32 (IN SWITCH_STACK_ENTRY_POINT EntryPoint, IN VOID *Context1 OPTIONAL, IN VOID *Context2 OPTIONAL, IN VOID *NewStack)
VOID EFIAPI	InternalX86DisablePaging32 (IN SWITCH_STACK_ENTRY_POINT EntryPoint, IN VOID *Context1 OPTIONAL, IN VOID *Context2 OPTIONAL, IN VOID *NewStack)
VOID EFIAPI	InternalX86EnablePaging64 (IN UINT16 Cs, IN UINT64 EntryPoint, IN UINT64 Context1 OPTIONAL, IN UINT64 Context2 OPTIONAL, IN UINT64 NewStack)

Detailed Description

Non-existing BaseLib functions on x64

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

Definition in file Non-existing.c.

Function Documentation

InternalX86DisablePaging32()

VOID EFIAPI InternalX86DisablePaging32	(	IN SWITCH_STACK_ENTRY_POINT	EntryPoint,
		IN VOID *Context1	OPTIONAL,
		IN VOID *Context2	OPTIONAL,
		IN VOID *	NewStack
	)

Disables the 32-bit paging mode on the CPU.

Disables the 32-bit paging mode on the CPU and returns to 32-bit protected mode. This function assumes the current execution mode is 32-paged protected mode. This function is only available on IA-32. After the 32-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 NULL. The function EntryPoint must never return.

There are a number of constraints that must be followed before calling this function: 1) Interrupts must be disabled. 2) The caller must be in 32-bit paged mode. 3) CR0, CR3, and CR4 must be compatible with 32-bit paged mode. 4) CR3 must point to valid page tables that guarantee that the pages for this function and the stack are identity mapped.

Parameters

EntryPoint	A pointer to function to call with the new stack after paging is disabled.
Context1	A pointer to the context to pass into the EntryPoint function as the first parameter after paging is disabled.
Context2	A pointer to the context to pass into the EntryPoint function as the second parameter after paging is disabled.
NewStack	A pointer to the new stack to use for the EntryPoint function after paging is disabled.

Definition at line 92 of file Non-existing.c.

InternalX86EnablePaging32()

VOID EFIAPI InternalX86EnablePaging32	(	IN SWITCH_STACK_ENTRY_POINT	EntryPoint,
		IN VOID *Context1	OPTIONAL,
		IN VOID *Context2	OPTIONAL,
		IN VOID *	NewStack
	)

Enables the 32-bit paging mode on the CPU.

Enables the 32-bit paging mode on the CPU. CR0, CR3, CR4, and the page tables must be properly initialized prior to calling this service. This function assumes the current execution mode is 32-bit protected mode. This function is only available on IA-32. After the 32-bit paging mode is enabled, 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 NULL. The function EntryPoint must never return.

There are a number of constraints that must be followed before calling this function: 1) Interrupts must be disabled. 2) The caller must be in 32-bit protected mode with flat descriptors. This means all descriptors must have a base of 0 and a limit of 4GB. 3) CR0 and CR4 must be compatible with 32-bit protected mode with flat descriptors. 4) CR3 must point to valid page tables that will be used once the transition is complete, and those page tables must guarantee that the pages for this function and the stack are identity mapped.

Parameters

EntryPoint	A pointer to function to call with the new stack after paging is enabled.
Context1	A pointer to the context to pass into the EntryPoint function as the first parameter after paging is enabled.
Context2	A pointer to the context to pass into the EntryPoint function as the second parameter after paging is enabled.
NewStack	A pointer to the new stack to use for the EntryPoint function after paging is enabled.

Definition at line 47 of file Non-existing.c.

InternalX86EnablePaging64()

VOID EFIAPI InternalX86EnablePaging64	(	IN UINT16	Cs,
		IN UINT64	EntryPoint,
		IN UINT64 Context1	OPTIONAL,
		IN UINT64 Context2	OPTIONAL,
		IN UINT64	NewStack
	)

Enables the 64-bit paging mode on the CPU.

Enables the 64-bit paging mode on the CPU. CR0, CR3, CR4, and the page tables must be properly initialized prior to calling this service. This function assumes the current execution mode is 32-bit protected mode with flat descriptors. This function is only available on IA-32. After the 64-bit paging mode is enabled, 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.

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 long mode.
EntryPoint	The 64-bit virtual address of the function to call with the new stack after paging is enabled.
Context1	The 64-bit virtual address of the context to pass into the EntryPoint function as the first parameter after paging is enabled.
Context2	The 64-bit virtual address of the context to pass into the EntryPoint function as the second parameter after paging is enabled.
NewStack	The 64-bit virtual address of the new stack to use for the EntryPoint function after paging is enabled.

Definition at line 134 of file Non-existing.c.