6b821be140
Implement support for read-protected memory by wiring it up to the access flag in the page table descriptor. The resulting mapping is implicitly non-writable and non-executable as well, but this is good enough for implementing this attribute, as we never rely on write or execute permissions without read permissions. Signed-off-by: Ard Biesheuvel <ardb@kernel.org> Reviewed-by: Leif Lindholm <quic_llindhol@quicinc.com>
103 lines
2.3 KiB
C
103 lines
2.3 KiB
C
/** @file
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Copyright (c) 2015 - 2016, Linaro Ltd. All rights reserved.<BR>
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SPDX-License-Identifier: BSD-2-Clause-Patent
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**/
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#ifndef ARM_MMU_LIB_H_
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#define ARM_MMU_LIB_H_
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#include <Uefi/UefiBaseType.h>
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#include <Library/ArmLib.h>
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EFI_STATUS
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EFIAPI
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ArmConfigureMmu (
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IN ARM_MEMORY_REGION_DESCRIPTOR *MemoryTable,
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OUT VOID **TranslationTableBase OPTIONAL,
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OUT UINTN *TranslationTableSize OPTIONAL
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);
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/**
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Convert a region of memory to read-protected, by clearing the access flag.
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@param BaseAddress The start of the region.
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@param Length The size of the region.
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@retval EFI_SUCCESS The attributes were set successfully.
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@retval EFI_OUT_OF_RESOURCES The operation failed due to insufficient memory.
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**/
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EFI_STATUS
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EFIAPI
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ArmSetMemoryRegionNoAccess (
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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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Convert a region of memory to read-enabled, by setting the access flag.
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@param BaseAddress The start of the region.
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@param Length The size of the region.
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@retval EFI_SUCCESS The attributes were set successfully.
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@retval EFI_OUT_OF_RESOURCES The operation failed due to insufficient memory.
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**/
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EFI_STATUS
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EFIAPI
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ArmClearMemoryRegionNoAccess (
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IN EFI_PHYSICAL_ADDRESS BaseAddress,
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IN UINT64 Length
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);
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EFI_STATUS
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EFIAPI
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ArmSetMemoryRegionNoExec (
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IN EFI_PHYSICAL_ADDRESS BaseAddress,
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IN UINT64 Length
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);
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EFI_STATUS
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EFIAPI
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ArmClearMemoryRegionNoExec (
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IN EFI_PHYSICAL_ADDRESS BaseAddress,
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IN UINT64 Length
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);
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EFI_STATUS
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EFIAPI
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ArmSetMemoryRegionReadOnly (
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IN EFI_PHYSICAL_ADDRESS BaseAddress,
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IN UINT64 Length
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);
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EFI_STATUS
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EFIAPI
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ArmClearMemoryRegionReadOnly (
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IN EFI_PHYSICAL_ADDRESS BaseAddress,
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IN UINT64 Length
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);
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VOID
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EFIAPI
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ArmReplaceLiveTranslationEntry (
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IN UINT64 *Entry,
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IN UINT64 Value,
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IN UINT64 RegionStart,
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IN BOOLEAN DisableMmu
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);
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EFI_STATUS
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ArmSetMemoryAttributes (
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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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#endif // ARM_MMU_LIB_H_
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