mirror of https://github.com/acidanthera/audk.git
234 lines
10 KiB
C
234 lines
10 KiB
C
/** @file
|
|
The Legacy Region Protocol controls the read, write and boot-lock attributes for
|
|
the region 0xC0000 to 0xFFFFF.
|
|
|
|
Copyright (c) 2009 - 2018, Intel Corporation. All rights reserved.<BR>
|
|
SPDX-License-Identifier: BSD-2-Clause-Patent
|
|
|
|
@par Revision Reference:
|
|
This Protocol is defined in UEFI Platform Initialization Specification 1.2
|
|
Volume 5: Standards
|
|
|
|
**/
|
|
|
|
#ifndef __LEGACY_REGION2_H__
|
|
#define __LEGACY_REGION2_H__
|
|
|
|
|
|
#define EFI_LEGACY_REGION2_PROTOCOL_GUID \
|
|
{ \
|
|
0x70101eaf, 0x85, 0x440c, {0xb3, 0x56, 0x8e, 0xe3, 0x6f, 0xef, 0x24, 0xf0 } \
|
|
}
|
|
|
|
typedef struct _EFI_LEGACY_REGION2_PROTOCOL EFI_LEGACY_REGION2_PROTOCOL;
|
|
|
|
/**
|
|
Modify the hardware to allow (decode) or disallow (not decode) memory reads in a region.
|
|
|
|
If the On parameter evaluates to TRUE, this function enables memory reads in the address range
|
|
Start to (Start + Length - 1).
|
|
If the On parameter evaluates to FALSE, this function disables memory reads in the address range
|
|
Start to (Start + Length - 1).
|
|
|
|
@param This[in] Indicates the EFI_LEGACY_REGION2_PROTOCOL instance.
|
|
@param Start[in] The beginning of the physical address of the region whose attributes
|
|
should be modified.
|
|
@param Length[in] The number of bytes of memory whose attributes should be modified.
|
|
The actual number of bytes modified may be greater than the number
|
|
specified.
|
|
@param Granularity[out] The number of bytes in the last region affected. This may be less
|
|
than the total number of bytes affected if the starting address
|
|
was not aligned to a region's starting address or if the length
|
|
was greater than the number of bytes in the first region.
|
|
@param On[in] Decode / Non-Decode flag.
|
|
|
|
@retval EFI_SUCCESS The region's attributes were successfully modified.
|
|
@retval EFI_INVALID_PARAMETER If Start or Length describe an address not in the Legacy Region.
|
|
|
|
**/
|
|
typedef
|
|
EFI_STATUS
|
|
(EFIAPI *EFI_LEGACY_REGION2_DECODE)(
|
|
IN EFI_LEGACY_REGION2_PROTOCOL *This,
|
|
IN UINT32 Start,
|
|
IN UINT32 Length,
|
|
OUT UINT32 *Granularity,
|
|
IN BOOLEAN *On
|
|
);
|
|
|
|
|
|
/**
|
|
Modify the hardware to disallow memory writes in a region.
|
|
|
|
This function changes the attributes of a memory range to not allow writes.
|
|
|
|
@param This[in] Indicates the EFI_LEGACY_REGION2_PROTOCOL instance.
|
|
@param Start[in] The beginning of the physical address of the region whose
|
|
attributes should be modified.
|
|
@param Length[in] The number of bytes of memory whose attributes should be modified.
|
|
The actual number of bytes modified may be greater than the number
|
|
specified.
|
|
@param Granularity[out] The number of bytes in the last region affected. This may be less
|
|
than the total number of bytes affected if the starting address was
|
|
not aligned to a region's starting address or if the length was
|
|
greater than the number of bytes in the first region.
|
|
|
|
@retval EFI_SUCCESS The region's attributes were successfully modified.
|
|
@retval EFI_INVALID_PARAMETER If Start or Length describe an address not in the Legacy Region.
|
|
|
|
**/
|
|
typedef
|
|
EFI_STATUS
|
|
(EFIAPI *EFI_LEGACY_REGION2_LOCK)(
|
|
IN EFI_LEGACY_REGION2_PROTOCOL *This,
|
|
IN UINT32 Start,
|
|
IN UINT32 Length,
|
|
OUT UINT32 *Granularity
|
|
);
|
|
|
|
|
|
/**
|
|
Modify the hardware to disallow memory attribute changes in a region.
|
|
|
|
This function makes the attributes of a region read only. Once a region is boot-locked with this
|
|
function, the read and write attributes of that region cannot be changed until a power cycle has
|
|
reset the boot-lock attribute. Calls to Decode(), Lock() and Unlock() will have no effect.
|
|
|
|
@param This[in] Indicates the EFI_LEGACY_REGION2_PROTOCOL instance.
|
|
@param Start[in] The beginning of the physical address of the region whose
|
|
attributes should be modified.
|
|
@param Length[in] The number of bytes of memory whose attributes should be modified.
|
|
The actual number of bytes modified may be greater than the number
|
|
specified.
|
|
@param Granularity[out] The number of bytes in the last region affected. This may be less
|
|
than the total number of bytes affected if the starting address was
|
|
not aligned to a region's starting address or if the length was
|
|
greater than the number of bytes in the first region.
|
|
|
|
@retval EFI_SUCCESS The region's attributes were successfully modified.
|
|
@retval EFI_INVALID_PARAMETER If Start or Length describe an address not in the Legacy Region.
|
|
@retval EFI_UNSUPPORTED The chipset does not support locking the configuration registers in
|
|
a way that will not affect memory regions outside the legacy memory
|
|
region.
|
|
|
|
**/
|
|
typedef
|
|
EFI_STATUS
|
|
(EFIAPI *EFI_LEGACY_REGION2_BOOT_LOCK)(
|
|
IN EFI_LEGACY_REGION2_PROTOCOL *This,
|
|
IN UINT32 Start,
|
|
IN UINT32 Length,
|
|
OUT UINT32 *Granularity OPTIONAL
|
|
);
|
|
|
|
|
|
/**
|
|
Modify the hardware to allow memory writes in a region.
|
|
|
|
This function changes the attributes of a memory range to allow writes.
|
|
|
|
@param This[in] Indicates the EFI_LEGACY_REGION2_PROTOCOL instance.
|
|
@param Start[in] The beginning of the physical address of the region whose
|
|
attributes should be modified.
|
|
@param Length[in] The number of bytes of memory whose attributes should be modified.
|
|
The actual number of bytes modified may be greater than the number
|
|
specified.
|
|
@param Granularity[out] The number of bytes in the last region affected. This may be less
|
|
than the total number of bytes affected if the starting address was
|
|
not aligned to a region's starting address or if the length was
|
|
greater than the number of bytes in the first region.
|
|
|
|
@retval EFI_SUCCESS The region's attributes were successfully modified.
|
|
@retval EFI_INVALID_PARAMETER If Start or Length describe an address not in the Legacy Region.
|
|
|
|
**/
|
|
typedef
|
|
EFI_STATUS
|
|
(EFIAPI *EFI_LEGACY_REGION2_UNLOCK)(
|
|
IN EFI_LEGACY_REGION2_PROTOCOL *This,
|
|
IN UINT32 Start,
|
|
IN UINT32 Length,
|
|
OUT UINT32 *Granularity
|
|
);
|
|
|
|
|
|
typedef enum {
|
|
LegacyRegionDecoded, ///< This region is currently set to allow reads.
|
|
LegacyRegionNotDecoded, ///< This region is currently set to not allow reads.
|
|
LegacyRegionWriteEnabled, ///< This region is currently set to allow writes.
|
|
LegacyRegionWriteDisabled, ///< This region is currently set to write protected.
|
|
LegacyRegionBootLocked, ///< This region's attributes are locked, cannot be modified until
|
|
///< after a power cycle.
|
|
LegacyRegionNotLocked ///< This region's attributes are not locked.
|
|
} EFI_LEGACY_REGION_ATTRIBUTE;
|
|
|
|
|
|
typedef struct {
|
|
///
|
|
/// The beginning of the physical address of this
|
|
/// region.
|
|
///
|
|
UINT32 Start;
|
|
///
|
|
/// The number of bytes in this region.
|
|
///
|
|
UINT32 Length;
|
|
///
|
|
/// Attribute of the Legacy Region Descriptor that
|
|
/// describes the capabilities for that memory region.
|
|
///
|
|
EFI_LEGACY_REGION_ATTRIBUTE Attribute;
|
|
///
|
|
/// Describes the byte length programmability
|
|
/// associated with the Start address and the specified
|
|
/// Attribute setting.
|
|
UINT32 Granularity;
|
|
} EFI_LEGACY_REGION_DESCRIPTOR;
|
|
|
|
|
|
/**
|
|
Get region information for the attributes of the Legacy Region.
|
|
|
|
This function is used to discover the granularity of the attributes for the memory in the legacy
|
|
region. Each attribute may have a different granularity and the granularity may not be the same
|
|
for all memory ranges in the legacy region.
|
|
|
|
@param This[in] Indicates the EFI_LEGACY_REGION2_PROTOCOL instance.
|
|
@param DescriptorCount[out] The number of region descriptor entries returned in the Descriptor
|
|
buffer.
|
|
@param Descriptor[out] A pointer to a pointer used to return a buffer where the legacy
|
|
region information is deposited. This buffer will contain a list of
|
|
DescriptorCount number of region descriptors. This function will
|
|
provide the memory for the buffer.
|
|
|
|
@retval EFI_SUCCESS The information structure was returned.
|
|
@retval EFI_UNSUPPORTED This function is not supported.
|
|
|
|
**/
|
|
typedef
|
|
EFI_STATUS
|
|
(EFIAPI *EFI_LEGACY_REGION_GET_INFO)(
|
|
IN EFI_LEGACY_REGION2_PROTOCOL *This,
|
|
OUT UINT32 *DescriptorCount,
|
|
OUT EFI_LEGACY_REGION_DESCRIPTOR **Descriptor
|
|
);
|
|
|
|
|
|
///
|
|
/// The EFI_LEGACY_REGION2_PROTOCOL is used to abstract the hardware control of the memory
|
|
/// attributes of the Option ROM shadowing region, 0xC0000 to 0xFFFFF.
|
|
/// There are three memory attributes that can be modified through this protocol: read, write and
|
|
/// boot-lock. These protocols may be set in any combination.
|
|
///
|
|
struct _EFI_LEGACY_REGION2_PROTOCOL {
|
|
EFI_LEGACY_REGION2_DECODE Decode;
|
|
EFI_LEGACY_REGION2_LOCK Lock;
|
|
EFI_LEGACY_REGION2_BOOT_LOCK BootLock;
|
|
EFI_LEGACY_REGION2_UNLOCK UnLock;
|
|
EFI_LEGACY_REGION_GET_INFO GetInfo;
|
|
};
|
|
|
|
extern EFI_GUID gEfiLegacyRegion2ProtocolGuid;
|
|
|
|
#endif
|