b26f0cf9ee
https://bugzilla.tianocore.org/show_bug.cgi?id=1373 Replace BSD 2-Clause License with BSD+Patent License. This change is based on the following emails: https://lists.01.org/pipermail/edk2-devel/2019-February/036260.html https://lists.01.org/pipermail/edk2-devel/2018-October/030385.html RFCs with detailed process for the license change: V3: https://lists.01.org/pipermail/edk2-devel/2019-March/038116.html V2: https://lists.01.org/pipermail/edk2-devel/2019-March/037669.html V1: https://lists.01.org/pipermail/edk2-devel/2019-March/037500.html Contributed-under: TianoCore Contribution Agreement 1.1 Signed-off-by: Michael D Kinney <michael.d.kinney@intel.com> Reviewed-by: Laszlo Ersek <lersek@redhat.com>
204 lines
8.7 KiB
C
204 lines
8.7 KiB
C
/** @file
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Legacy Region Support
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Copyright (c) 2008 - 2016, Intel Corporation. All rights reserved.<BR>
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SPDX-License-Identifier: BSD-2-Clause-Patent
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**/
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#ifndef _LEGACY_REGION_DXE_H_
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#define _LEGACY_REGION_DXE_H_
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#include <PiDxe.h>
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#include <Protocol/LegacyRegion2.h>
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#include <IndustryStandard/Pci.h>
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#include <IndustryStandard/Q35MchIch9.h>
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#include <IndustryStandard/I440FxPiix4.h>
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#include <Library/PciLib.h>
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#include <Library/PcdLib.h>
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#include <Library/DebugLib.h>
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#include <Library/MemoryAllocationLib.h>
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#include <Library/UefiBootServicesTableLib.h>
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#define PAM_BASE_ADDRESS 0xc0000
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#define PAM_LIMIT_ADDRESS BASE_1MB
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//
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// Describes Legacy Region blocks and status.
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//
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typedef struct {
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UINT32 Start;
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UINT32 Length;
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BOOLEAN ReadEnabled;
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BOOLEAN WriteEnabled;
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} LEGACY_MEMORY_SECTION_INFO;
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//
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// Provides a map of the PAM registers and bits used to set Read/Write access.
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//
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typedef struct {
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UINTN PAMRegPciLibAddress;
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UINT8 ReadEnableData;
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UINT8 WriteEnableData;
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} PAM_REGISTER_VALUE;
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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_REGION_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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EFI_STATUS
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EFIAPI
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LegacyRegion2Decode (
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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_REGION_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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EFI_STATUS
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EFIAPI
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LegacyRegion2Lock (
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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_REGION_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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EFI_STATUS
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EFIAPI
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LegacyRegion2BootLock (
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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 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_REGION_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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EFI_STATUS
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EFIAPI
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LegacyRegion2Unlock (
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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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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_REGION_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 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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EFI_STATUS
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EFIAPI
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LegacyRegionGetInfo (
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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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#endif
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