SaveLongModeContext.c File Reference

#include <Uefi.h>
#include <Protocol/Capsule.h>
#include <Protocol/DxeSmmReadyToLock.h>
#include <Protocol/VariableLock.h>
#include <Guid/CapsuleVendor.h>
#include <Guid/AcpiS3Context.h>
#include <Library/DebugLib.h>
#include <Library/PcdLib.h>
#include <Library/UefiBootServicesTableLib.h>
#include <Library/UefiRuntimeServicesTableLib.h>
#include <Library/UefiRuntimeLib.h>
#include <Library/BaseLib.h>
#include <Library/UefiLib.h>
#include <Library/BaseMemoryLib.h>

Go to the source code of this file.

Macros
#define	EXTRA_PAGE_TABLE_PAGES   8

Functions
VOID *	AllocateReservedMemoryBelow4G (IN UINTN Size)
VOID EFIAPI	VariableLockCapsuleLongModeBufferVariable (IN EFI_EVENT Event, IN VOID *Context)
VOID EFIAPI	PrepareContextForCapsulePei (VOID)
VOID	SaveLongModeContext (VOID)

Detailed Description

Create the variable to save the base address of page table and stack for transferring into long mode in IA32 capsule PEI.

Copyright (c) 2011 - 2018, Intel Corporation. All rights reserved.
SPDX-License-Identifier: BSD-2-Clause-Patent

Definition in file SaveLongModeContext.c.

Macro Definition Documentation

EXTRA_PAGE_TABLE_PAGES

#define EXTRA_PAGE_TABLE_PAGES   8

Definition at line 31 of file SaveLongModeContext.c.

Function Documentation

AllocateReservedMemoryBelow4G()

VOID * AllocateReservedMemoryBelow4G

(

IN UINTN

Size

)

Allocate EfiReservedMemoryType below 4G memory address.

This function allocates EfiReservedMemoryType below 4G memory address.

Parameters

Size	Size of memory to allocate.

Returns

Allocated Address for output.

Definition at line 44 of file SaveLongModeContext.c.

PrepareContextForCapsulePei()

VOID EFIAPI PrepareContextForCapsulePei

(

VOID

)

1. Allocate Reserved memory for capsule PEIM to establish a 1:1 Virtual to Physical mapping.
2. Allocate Reserved memroy as a stack for capsule PEIM to transfer from 32-bit mdoe to 64-bit mode.

Definition at line 104 of file SaveLongModeContext.c.

SaveLongModeContext()

VOID SaveLongModeContext

(

VOID

)

Create the variable to save the base address of page table and stack for transferring into long mode in IA32 capsule PEI.

Definition at line 201 of file SaveLongModeContext.c.

VariableLockCapsuleLongModeBufferVariable()

VOID EFIAPI VariableLockCapsuleLongModeBufferVariable	(	IN EFI_EVENT	Event,
		IN VOID *	Context
	)

Register callback function upon VariableLockProtocol to lock EFI_CAPSULE_LONG_MODE_BUFFER_NAME variable to avoid malicious code to update it.

Parameters

[in]	Event	Event whose notification function is being invoked.
[in]	Context	Pointer to the notification function's context.

Definition at line 79 of file SaveLongModeContext.c.