mirror of https://github.com/acidanthera/audk.git
175 lines
6.2 KiB
C
175 lines
6.2 KiB
C
/** @file
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The EFI_SWAP_ADDRESS_RANGE_PROTOCOL is used to abstract the swap operation of boot block
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and backup block of FV. This swap is especially needed when updating the boot block of FV. If a
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power failure happens during the boot block update, the swapped backup block (now the boot block)
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can boot the machine with the old boot block backed up in it. The swap operation is platform dependent, so
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other protocols such as FTW (Fault Tolerant Write) should use this protocol instead of handling hardware directly.
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Copyright (c) 2009 - 2010, Intel Corporation. All rights reserved.<BR>
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This program and the accompanying materials are licensed and made available under
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the terms and conditions of the BSD License that accompanies this distribution.
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The full text of the license may be found at
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http://opensource.org/licenses/bsd-license.php.
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THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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**/
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#ifndef _EFI_SWAP_ADDRESS_RANGE_PROTOCOL_H_
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#define _EFI_SWAP_ADDRESS_RANGE_PROTOCOL_H_
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#define EFI_SWAP_ADDRESS_RANGE_PROTOCOL_GUID \
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{ \
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0x1259f60d, 0xb754, 0x468e, {0xa7, 0x89, 0x4d, 0xb8, 0x5d, 0x55, 0xe8, 0x7e } \
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}
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//
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// Forward reference for pure ANSI compatability
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//
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typedef struct _EFI_SWAP_ADDRESS_RANGE_PROTOCOL EFI_SWAP_ADDRESS_RANGE_PROTOCOL;
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#define EFI_UNSUPPORT_LOCK 0
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#define EFI_SOFTWARE_LOCK 1
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#define EFI_HARDWARE_LOCK 2
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typedef UINT8 EFI_SWAP_LOCK_CAPABILITY;
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//
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// Protocol APIs
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//
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/**
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This function gets the address range location of
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boot block and backup block.
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@param This Indicates the calling context.
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@param BootBlockBase The base address of current boot block.
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@param BootBlockSize The size (in bytes) of current boot block.
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@param BackupBlockBase The base address of current backup block.
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@param BackupBlockSize The size (in bytes) of current backup block.
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@retval EFI_SUCCESS The call was successful.
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**/
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typedef
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EFI_STATUS
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(EFIAPI *EFI_GET_RANGE_LOCATION)(
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IN EFI_SWAP_ADDRESS_RANGE_PROTOCOL *This,
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OUT EFI_PHYSICAL_ADDRESS *BootBlockBase,
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OUT UINTN *BootBlockSize,
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OUT EFI_PHYSICAL_ADDRESS *BackupBlockBase,
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OUT UINTN *BackupBlockSize
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);
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/**
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This service checks if the boot block and backup block has been swapped.
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@param This Indicates the calling context.
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@param SwapState True if the boot block and backup block has been swapped.
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False if the boot block and backup block has not been swapped.
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@retval EFI_SUCCESS The call was successful.
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**/
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typedef
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EFI_STATUS
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(EFIAPI *EFI_GET_SWAP_STATE)(
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IN EFI_SWAP_ADDRESS_RANGE_PROTOCOL *This,
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OUT BOOLEAN *SwapState
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);
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/**
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This service swaps the boot block and backup block, or swaps them back.
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It also acquires and releases software swap lock during operation. The setting of the new swap state
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is not affected by the old swap state.
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@param This Indicates the calling context.
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@param NewSwapState True to swap real boot block and backup block, False to swap them back.
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@retval EFI_SUCCESS The call was successful.
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@retval EFI_ABORTED Set swap state error.
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**/
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typedef
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EFI_STATUS
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(EFIAPI *EFI_SET_SWAP_STATE)(
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IN EFI_SWAP_ADDRESS_RANGE_PROTOCOL *This,
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IN BOOLEAN NewSwapState
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);
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/**
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This service checks if a Real Time Clock (RTC) power failure happened.
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If parameter RtcPowerFailed is true after the function returns, RTC power supply failed or was removed.
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It is recommended to check RTC power status before calling GetSwapState().
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@param This Indicates the calling context.
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@param RtcPowerFailed True if the RTC (Real Time Clock) power failed or was removed.
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@retval EFI_SUCCESS The call was successful.
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**/
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typedef
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EFI_STATUS
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(EFIAPI *EFI_GET_RTC_POWER_STATUS)(
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IN EFI_SWAP_ADDRESS_RANGE_PROTOCOL *This,
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OUT BOOLEAN *RtcPowerFailed
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);
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/**
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This service returns all lock methods for swap operations that the current platform
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supports. Could be software lock, hardware lock, or unsupport lock.
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Note that software and hardware lock methods can be used simultaneously.
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@param This Indicates the calling context.
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@param LockCapability The current lock method for swap operations.
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@retval EFI_SUCCESS The call was successful.
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**/
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typedef
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EFI_STATUS
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(EFIAPI *EFI_GET_SWAP_LOCK_CAPABILITY)(
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IN EFI_SWAP_ADDRESS_RANGE_PROTOCOL *This,
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OUT EFI_SWAP_LOCK_CAPABILITY *LockCapability
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);
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/**
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This service is used to acquire or release appointed kind of lock for Swap Address Range operations.
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Note that software and hardware lock mothod can be used simultaneously.
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@param This Indicates the calling context.
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@param LockCapability Indicates which lock to acquire or release.
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@param NewLockState True to acquire lock; False to release lock.
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@retval EFI_SUCCESS The call was successful.
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**/
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typedef
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EFI_STATUS
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(EFIAPI *EFI_SET_SWAP_LOCK)(
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IN EFI_SWAP_ADDRESS_RANGE_PROTOCOL *This,
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IN EFI_SWAP_LOCK_CAPABILITY LockCapability,
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IN BOOLEAN NewLockState
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);
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struct _EFI_SWAP_ADDRESS_RANGE_PROTOCOL {
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EFI_GET_RANGE_LOCATION GetRangeLocation; // has output parameters for base and length
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EFI_GET_SWAP_STATE GetSwapState; // are ranges swapped or not
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EFI_SET_SWAP_STATE SetSwapState; // swap or unswap ranges
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EFI_GET_RTC_POWER_STATUS GetRtcPowerStatus; // checks RTC battery, or whatever...
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EFI_GET_SWAP_LOCK_CAPABILITY GetSwapLockCapability; // Get TOP_SWAP lock capability,
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EFI_SET_SWAP_LOCK SetSwapLock; // Set TOP_SWAP lock state
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};
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extern EFI_GUID gEfiSwapAddressRangeProtocolGuid;
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#endif
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