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| author | Ard Biesheuvel <ard.biesheuvel@linaro.org> | 2017-02-15 17:11:56 +0000 |
|---|---|---|
| committer | Ard Biesheuvel <ard.biesheuvel@linaro.org> | 2017-02-21 17:23:03 +0000 |
| commit | e0307a7dad02aa8c0cd8b3b0b9edce8ddb3fef2e (patch) | |
| tree | 8dce6ef07c19a4b4522605c0028213a084c93e64 /ArmPkg/Library/ArmMmuLib/AArch64 | |
| parent | 0a9d732c91d99dcd06432722f76b170592b71abc (diff) | |
| download | edk2-e0307a7dad02aa8c0cd8b3b0b9edce8ddb3fef2e.tar.gz edk2-e0307a7dad02aa8c0cd8b3b0b9edce8ddb3fef2e.tar.bz2 edk2-e0307a7dad02aa8c0cd8b3b0b9edce8ddb3fef2e.zip | |
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>
Diffstat (limited to 'ArmPkg/Library/ArmMmuLib/AArch64')
| -rw-r--r-- | ArmPkg/Library/ArmMmuLib/AArch64/ArmMmuLibCore.c | 91 |
1 files changed, 63 insertions, 28 deletions
diff --git a/ArmPkg/Library/ArmMmuLib/AArch64/ArmMmuLibCore.c b/ArmPkg/Library/ArmMmuLib/AArch64/ArmMmuLibCore.c index 6aa970bc05..9e0593ce59 100644 --- a/ArmPkg/Library/ArmMmuLib/AArch64/ArmMmuLibCore.c +++ b/ArmPkg/Library/ArmMmuLib/AArch64/ArmMmuLibCore.c @@ -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;
-
- MemoryRegion.PhysicalBase = BaseAddress;
- MemoryRegion.VirtualBase = BaseAddress;
- MemoryRegion.Length = Length;
- MemoryRegion.Attributes = GcdAttributeToArmAttribute (Attributes);
+ UINT64 PageAttributes;
+ UINT64 PageAttributeMask;
+
+ 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;
}
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