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ArmPkg/ArmMmuLib: AARCH64: add support for modifying only permissions 

Since the new DXE page protection for PE/COFF images may invoke
EFI_CPU_ARCH_PROTOCOL.SetMemoryAttributes() with only permission
attributes set, add support for this in the AARCH64 MMU code.

Move the EFI_MEMORY_CACHETYPE_MASK macro to a shared location between
CpuDxe and ArmMmuLib so we don't have to introduce yet another
definition.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Reviewed-by: Leif Lindholm <leif.lindholm@linaro.org>
This commit is contained in:
Ard Biesheuvel 2017-02-15 17:11:56 +00:00
parent 0a9d732c91
commit e0307a7dad
3 changed files with 66 additions and 35 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
ArmPkg/Drivers/CpuDxe/CpuDxe.h
View File

@ -39,14 +39,6 @@
#include <Protocol/LoadedImage.h>
#define EFI_MEMORY_CACHETYPE_MASK (EFI_MEMORY_UC | \
EFI_MEMORY_WC | \
EFI_MEMORY_WT | \
EFI_MEMORY_WB | \
EFI_MEMORY_UCE \
)
/**
This function registers and enables the handler specified by InterruptHandler for a processor
interrupt or exception type specified by InterruptType. If InterruptHandler is NULL, then the

4
ArmPkg/Include/Library/ArmLib.h
View File

@ -26,6 +26,10 @@
#error "Unknown chipset."
#endif
#define EFI_MEMORY_CACHETYPE_MASK (EFI_MEMORY_UC | EFI_MEMORY_WC | \
EFI_MEMORY_WT | EFI_MEMORY_WB | \
EFI_MEMORY_UCE)
/**
* The UEFI firmware must not use the ARM_MEMORY_REGION_ATTRIBUTE_NONSECURE_* attributes.
*

89
ArmPkg/Library/ArmMmuLib/AArch64/ArmMmuLibCore.c
View File

@ -101,27 +101,6 @@ PageAttributeToGcdAttribute (
return GcdAttributes;
}
ARM_MEMORY_REGION_ATTRIBUTES
GcdAttributeToArmAttribute (
IN UINT64 GcdAttributes
)
{
switch (GcdAttributes & 0xFF) {
case EFI_MEMORY_UC:
return ARM_MEMORY_REGION_ATTRIBUTE_DEVICE;
case EFI_MEMORY_WC:
return ARM_MEMORY_REGION_ATTRIBUTE_UNCACHED_UNBUFFERED;
case EFI_MEMORY_WT:
return ARM_MEMORY_REGION_ATTRIBUTE_WRITE_THROUGH;
case EFI_MEMORY_WB:
return ARM_MEMORY_REGION_ATTRIBUTE_WRITE_BACK;
default:
DEBUG ((EFI_D_ERROR, "GcdAttributeToArmAttribute: 0x%lX attributes is not supported.\n", GcdAttributes));
ASSERT (0);
return ARM_MEMORY_REGION_ATTRIBUTE_DEVICE;
}
}
#define MIN_T0SZ 16
#define BITS_PER_LEVEL 9
@ -425,6 +404,48 @@ FillTranslationTable (
);
}
STATIC
UINT64
GcdAttributeToPageAttribute (
IN UINT64 GcdAttributes
)
{
UINT64 PageAttributes;
switch (GcdAttributes & EFI_MEMORY_CACHETYPE_MASK) {
case EFI_MEMORY_UC:
PageAttributes = TT_ATTR_INDX_DEVICE_MEMORY;
break;
case EFI_MEMORY_WC:
PageAttributes = TT_ATTR_INDX_MEMORY_NON_CACHEABLE;
break;
case EFI_MEMORY_WT:
PageAttributes = TT_ATTR_INDX_MEMORY_WRITE_THROUGH | TT_SH_INNER_SHAREABLE;
break;
case EFI_MEMORY_WB:
PageAttributes = TT_ATTR_INDX_MEMORY_WRITE_BACK | TT_SH_INNER_SHAREABLE;
break;
default:
PageAttributes = TT_ATTR_INDX_MASK;
break;
}
if ((GcdAttributes & EFI_MEMORY_XP) != 0 ||
(GcdAttributes & EFI_MEMORY_CACHETYPE_MASK) == EFI_MEMORY_UC) {
if (ArmReadCurrentEL () == AARCH64_EL2) {
PageAttributes |= TT_XN_MASK;
} else {
PageAttributes |= TT_UXN_MASK | TT_PXN_MASK;
}
}
if ((GcdAttributes & EFI_MEMORY_RO) != 0) {
PageAttributes |= TT_AP_RO_RO;
}
return PageAttributes | TT_AF;
}
RETURN_STATUS
SetMemoryAttributes (
IN EFI_PHYSICAL_ADDRESS BaseAddress,
@ -434,17 +455,31 @@ SetMemoryAttributes (
)
{
RETURN_STATUS Status;
ARM_MEMORY_REGION_DESCRIPTOR MemoryRegion;
UINT64 *TranslationTable;
UINT64 PageAttributes;
UINT64 PageAttributeMask;
MemoryRegion.PhysicalBase = BaseAddress;
MemoryRegion.VirtualBase = BaseAddress;
MemoryRegion.Length = Length;
MemoryRegion.Attributes = GcdAttributeToArmAttribute (Attributes);
PageAttributes = GcdAttributeToPageAttribute (Attributes);
PageAttributeMask = 0;
if ((Attributes & EFI_MEMORY_CACHETYPE_MASK) == 0) {
//
// No memory type was set in Attributes, so we are going to update the
// permissions only.
//
PageAttributes &= TT_AP_MASK | TT_UXN_MASK | TT_PXN_MASK;
PageAttributeMask = ~(TT_ADDRESS_MASK_BLOCK_ENTRY | TT_AP_MASK |
TT_PXN_MASK | TT_XN_MASK);
}
TranslationTable = ArmGetTTBR0BaseAddress ();
Status = FillTranslationTable (TranslationTable, &MemoryRegion);
Status = UpdateRegionMapping (
TranslationTable,
BaseAddress,
Length,
PageAttributes,
PageAttributeMask);
if (RETURN_ERROR (Status)) {
return Status;
}