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