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/** @file
This protocol manages the legacy memory regions between 0xc0000 - 0xfffff.
Copyright (c) 2007 - 2018, Intel Corporation. All rights reserved.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent
@par Revision Reference:
This protocol is defined in Framework for EFI Compatibility Support Module spec
Version 0.97.
**/
#ifndef _EFI_LEGACY_REGION_H_
#define _EFI_LEGACY_REGION_H_
#define EFI_LEGACY_REGION_PROTOCOL_GUID \
{ \
0xfc9013a, 0x568, 0x4ba9, {0x9b, 0x7e, 0xc9, 0xc3, 0x90, 0xa6, 0x60, 0x9b } \
}
typedef struct _EFI_LEGACY_REGION_PROTOCOL EFI_LEGACY_REGION_PROTOCOL;
/**
Sets hardware to decode or not decode a region.
@param This Indicates the EFI_LEGACY_REGION_PROTOCOL instance
@param Start The start of the region to decode.
@param Length The size in bytes of the region.
@param On The decode/nondecode flag.
@retval EFI_SUCCESS The decode range successfully changed.
**/
typedef
EFI_STATUS
(EFIAPI *EFI_LEGACY_REGION_DECODE)(
IN EFI_LEGACY_REGION_PROTOCOL *This,
IN UINT32 Start,
IN UINT32 Length,
IN BOOLEAN *On
);
/**
Sets a region to read only.
@param This Indicates the EFI_LEGACY_REGION_PROTOCOL instance.
@param Start The start of region to lock.
@param Length The size in bytes of the region.
@param Granularity Lock attribute affects this granularity in bytes.
@retval EFI_SUCCESS The region was made read only.
**/
typedef
EFI_STATUS
(EFIAPI *EFI_LEGACY_REGION_LOCK)(
IN EFI_LEGACY_REGION_PROTOCOL *This,
IN UINT32 Start,
IN UINT32 Length,
OUT UINT32 *Granularity OPTIONAL
);
/**
Sets a region to read only and ensures that flash is locked from being
inadvertently modified.
@param This Indicates the EFI_LEGACY_REGION_PROTOCOL instance
@param Start The start of region to lock.
@param Length The size in bytes of the region.
@param Granularity Lock attribute affects this granularity in bytes.
@retval EFI_SUCCESS The region was made read only and flash is locked.
**/
typedef
EFI_STATUS
(EFIAPI *EFI_LEGACY_REGION_BOOT_LOCK)(
IN EFI_LEGACY_REGION_PROTOCOL *This,
IN UINT32 Start,
IN UINT32 Length,
OUT UINT32 *Granularity OPTIONAL
);
/**
Sets a region to read-write.
@param This Indicates the EFI_LEGACY_REGION_PROTOCOL instance
@param Start The start of region to lock.
@param Length The size in bytes of the region.
@param Granularity Lock attribute affects this granularity in bytes.
@retval EFI_SUCCESS The region was successfully made read-write.
**/
typedef
EFI_STATUS
(EFIAPI *EFI_LEGACY_REGION_UNLOCK)(
IN EFI_LEGACY_REGION_PROTOCOL *This,
IN UINT32 Start,
IN UINT32 Length,
OUT UINT32 *Granularity OPTIONAL
);
/**
Abstracts the hardware control of the physical address region 0xC0000-C0xFFFFF
for the traditional BIOS.
**/
struct _EFI_LEGACY_REGION_PROTOCOL {
EFI_LEGACY_REGION_DECODE Decode; ///< Specifies a region for the chipset to decode.
EFI_LEGACY_REGION_LOCK Lock; ///< Makes the specified OpROM region read only or locked.
EFI_LEGACY_REGION_BOOT_LOCK BootLock; ///< Sets a region to read only and ensures tat flash is locked from.
///< inadvertent modification.
EFI_LEGACY_REGION_UNLOCK UnLock; ///< Makes the specified OpROM region read-write or unlocked.
};
extern EFI_GUID gEfiLegacyRegionProtocolGuid;
#endif
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