5542e528cd
Now that ArmSetMemoryAttributes() permits a mask to be provided, we can simplify the implementation the UEFI memory attribute protocol substantially, and just pass on the requested mask to be set or cleared directly. Signed-off-by: Ard Biesheuvel <ardb@kernel.org> Reviewed-by: Oliver Smith-Denny <osde@linux.microsoft.com> Reviewed-by: Michael Kubacki <michael.kubacki@microsoft.com>
274 lines
8.9 KiB
C
274 lines
8.9 KiB
C
/** @file
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Copyright (c) 2023, Google LLC. All rights reserved.
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SPDX-License-Identifier: BSD-2-Clause-Patent
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**/
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#include "CpuDxe.h"
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/**
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Check whether the provided memory range is covered by a single entry of type
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EfiGcdSystemMemory in the GCD memory map.
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@param BaseAddress The physical address that is the start address of
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a memory region.
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@param Length The size in bytes of the memory region.
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@return Whether the region is system memory or not.
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**/
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STATIC
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BOOLEAN
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RegionIsSystemMemory (
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IN EFI_PHYSICAL_ADDRESS BaseAddress,
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IN UINT64 Length
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)
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{
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EFI_GCD_MEMORY_SPACE_DESCRIPTOR GcdDescriptor;
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EFI_PHYSICAL_ADDRESS GcdEndAddress;
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EFI_STATUS Status;
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Status = gDS->GetMemorySpaceDescriptor (BaseAddress, &GcdDescriptor);
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if (EFI_ERROR (Status) ||
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(GcdDescriptor.GcdMemoryType != EfiGcdMemoryTypeSystemMemory))
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{
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return FALSE;
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}
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GcdEndAddress = GcdDescriptor.BaseAddress + GcdDescriptor.Length;
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//
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// Return TRUE if the GCD descriptor covers the range entirely
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//
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return GcdEndAddress >= (BaseAddress + Length);
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}
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/**
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This function retrieves the attributes of the memory region specified by
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BaseAddress and Length. If different attributes are obtained from different
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parts of the memory region, EFI_NO_MAPPING will be returned.
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@param This The EFI_MEMORY_ATTRIBUTE_PROTOCOL instance.
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@param BaseAddress The physical address that is the start address of
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a memory region.
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@param Length The size in bytes of the memory region.
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@param Attributes Pointer to attributes returned.
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@retval EFI_SUCCESS The attributes got for the memory region.
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@retval EFI_INVALID_PARAMETER Length is zero.
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Attributes is NULL.
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@retval EFI_NO_MAPPING Attributes are not consistent cross the memory
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region.
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@retval EFI_UNSUPPORTED The processor does not support one or more
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bytes of the memory resource range specified
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by BaseAddress and Length.
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**/
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STATIC
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EFI_STATUS
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GetMemoryAttributes (
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IN EFI_MEMORY_ATTRIBUTE_PROTOCOL *This,
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IN EFI_PHYSICAL_ADDRESS BaseAddress,
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IN UINT64 Length,
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OUT UINT64 *Attributes
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)
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{
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UINTN RegionAddress;
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UINTN RegionLength;
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UINTN RegionAttributes;
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UINTN Union;
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UINTN Intersection;
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EFI_STATUS Status;
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if ((Length == 0) || (Attributes == NULL)) {
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return EFI_INVALID_PARAMETER;
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}
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if (!RegionIsSystemMemory (BaseAddress, Length)) {
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return EFI_UNSUPPORTED;
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}
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DEBUG ((
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DEBUG_VERBOSE,
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"%a: BaseAddress == 0x%lx, Length == 0x%lx\n",
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__func__,
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BaseAddress,
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Length
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));
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Union = 0;
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Intersection = MAX_UINTN;
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for (RegionAddress = (UINTN)BaseAddress;
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RegionAddress < (UINTN)(BaseAddress + Length);
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RegionAddress += RegionLength)
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{
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Status = GetMemoryRegion (
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&RegionAddress,
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&RegionLength,
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&RegionAttributes
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);
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DEBUG ((
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DEBUG_VERBOSE,
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"%a: RegionAddress == 0x%lx, RegionLength == 0x%lx, RegionAttributes == 0x%lx\n",
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__func__,
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(UINT64)RegionAddress,
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(UINT64)RegionLength,
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(UINT64)RegionAttributes
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));
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if (EFI_ERROR (Status)) {
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return EFI_NO_MAPPING;
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}
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Union |= RegionAttributes;
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Intersection &= RegionAttributes;
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}
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DEBUG ((
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DEBUG_VERBOSE,
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"%a: Union == %lx, Intersection == %lx\n",
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__func__,
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(UINT64)Union,
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(UINT64)Intersection
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));
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if (Union != Intersection) {
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return EFI_NO_MAPPING;
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}
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*Attributes = RegionAttributeToGcdAttribute (Union);
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*Attributes &= EFI_MEMORY_RP | EFI_MEMORY_RO | EFI_MEMORY_XP;
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return EFI_SUCCESS;
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}
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/**
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This function set given attributes of the memory region specified by
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BaseAddress and Length.
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The valid Attributes is EFI_MEMORY_RP, EFI_MEMORY_XP, and EFI_MEMORY_RO.
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@param This The EFI_MEMORY_ATTRIBUTE_PROTOCOL instance.
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@param BaseAddress The physical address that is the start address of
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a memory region.
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@param Length The size in bytes of the memory region.
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@param Attributes The bit mask of attributes to set for the memory
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region.
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@retval EFI_SUCCESS The attributes were set for the memory region.
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@retval EFI_INVALID_PARAMETER Length is zero.
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Attributes specified an illegal combination of
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attributes that cannot be set together.
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@retval EFI_UNSUPPORTED The processor does not support one or more
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bytes of the memory resource range specified
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by BaseAddress and Length.
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The bit mask of attributes is not supported for
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the memory resource range specified by
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BaseAddress and Length.
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@retval EFI_OUT_OF_RESOURCES Requested attributes cannot be applied due to
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lack of system resources.
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@retval EFI_ACCESS_DENIED Attributes for the requested memory region are
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controlled by system firmware and cannot be
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updated via the protocol.
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**/
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STATIC
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EFI_STATUS
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SetMemoryAttributes (
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IN EFI_MEMORY_ATTRIBUTE_PROTOCOL *This,
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IN EFI_PHYSICAL_ADDRESS BaseAddress,
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IN UINT64 Length,
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IN UINT64 Attributes
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)
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{
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DEBUG ((
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DEBUG_INFO,
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"%a: BaseAddress == 0x%lx, Length == 0x%lx, Attributes == 0x%lx\n",
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__func__,
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(UINTN)BaseAddress,
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(UINTN)Length,
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(UINTN)Attributes
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));
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if ((Length == 0) ||
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((Attributes & ~(EFI_MEMORY_RO | EFI_MEMORY_RP | EFI_MEMORY_XP)) != 0))
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{
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return EFI_INVALID_PARAMETER;
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}
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if (!RegionIsSystemMemory (BaseAddress, Length)) {
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return EFI_UNSUPPORTED;
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}
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return ArmSetMemoryAttributes (BaseAddress, Length, Attributes, Attributes);
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}
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/**
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This function clears given attributes of the memory region specified by
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BaseAddress and Length.
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The valid Attributes is EFI_MEMORY_RP, EFI_MEMORY_XP, and EFI_MEMORY_RO.
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@param This The EFI_MEMORY_ATTRIBUTE_PROTOCOL instance.
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@param BaseAddress The physical address that is the start address of
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a memory region.
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@param Length The size in bytes of the memory region.
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@param Attributes The bit mask of attributes to clear for the memory
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region.
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@retval EFI_SUCCESS The attributes were cleared for the memory region.
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@retval EFI_INVALID_PARAMETER Length is zero.
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Attributes specified an illegal combination of
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attributes that cannot be cleared together.
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@retval EFI_UNSUPPORTED The processor does not support one or more
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bytes of the memory resource range specified
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by BaseAddress and Length.
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The bit mask of attributes is not supported for
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the memory resource range specified by
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BaseAddress and Length.
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@retval EFI_OUT_OF_RESOURCES Requested attributes cannot be applied due to
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lack of system resources.
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@retval EFI_ACCESS_DENIED Attributes for the requested memory region are
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controlled by system firmware and cannot be
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updated via the protocol.
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**/
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STATIC
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EFI_STATUS
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ClearMemoryAttributes (
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IN EFI_MEMORY_ATTRIBUTE_PROTOCOL *This,
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IN EFI_PHYSICAL_ADDRESS BaseAddress,
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IN UINT64 Length,
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IN UINT64 Attributes
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)
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{
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DEBUG ((
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DEBUG_INFO,
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"%a: BaseAddress == 0x%lx, Length == 0x%lx, Attributes == 0x%lx\n",
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__func__,
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(UINTN)BaseAddress,
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(UINTN)Length,
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(UINTN)Attributes
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));
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if ((Length == 0) ||
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((Attributes & ~(EFI_MEMORY_RO | EFI_MEMORY_RP | EFI_MEMORY_XP)) != 0))
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{
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return EFI_INVALID_PARAMETER;
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}
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if (!RegionIsSystemMemory (BaseAddress, Length)) {
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return EFI_UNSUPPORTED;
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}
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return ArmSetMemoryAttributes (BaseAddress, Length, 0, Attributes);
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}
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EFI_MEMORY_ATTRIBUTE_PROTOCOL mMemoryAttribute = {
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GetMemoryAttributes,
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SetMemoryAttributes,
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ClearMemoryAttributes
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};
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