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Given how the meaning of the attribute bits for page table entry types
is slightly awkward, and changes between levels, add some helpers to
abstract from this.
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Reviewed-by: Leif Lindholm <leif@nuviainc.com>
---
ArmPkg/Library/ArmMmuLib/AArch64/ArmMmuLibCore.c | 40 +++++++++++++++++---
1 file changed, 35 insertions(+), 5 deletions(-)
diff --git a/ArmPkg/Library/ArmMmuLib/AArch64/ArmMmuLibCore.c b/ArmPkg/Library/ArmMmuLib/AArch64/ArmMmuLibCore.c
index d78918cf7ba8..0680ba36d907 100644
--- a/ArmPkg/Library/ArmMmuLib/AArch64/ArmMmuLibCore.c
+++ b/ArmPkg/Library/ArmMmuLib/AArch64/ArmMmuLibCore.c
@@ -162,6 +162,36 @@ FreePageTablesRecursive (
FreePages (TranslationTable, 1);
}
+STATIC
+BOOLEAN
+IsBlockEntry (
+ IN UINT64 Entry,
+ IN UINTN Level
+ )
+{
+ if (Level == 3) {
+ return (Entry & TT_TYPE_MASK) == TT_TYPE_BLOCK_ENTRY_LEVEL3;
+ }
+ return (Entry & TT_TYPE_MASK) == TT_TYPE_BLOCK_ENTRY;
+}
+
+STATIC
+BOOLEAN
+IsTableEntry (
+ IN UINT64 Entry,
+ IN UINTN Level
+ )
+{
+ if (Level == 3) {
+ //
+ // TT_TYPE_TABLE_ENTRY aliases TT_TYPE_BLOCK_ENTRY_LEVEL3
+ // so we need to take the level into account as well.
+ //
+ return FALSE;
+ }
+ return (Entry & TT_TYPE_MASK) == TT_TYPE_TABLE_ENTRY;
+}
+
STATIC
EFI_STATUS
UpdateRegionMappingRecursive (
@@ -203,7 +233,7 @@ UpdateRegionMappingRecursive (
if (Level == 0 || ((RegionStart | BlockEnd) & BlockMask) != 0) {
ASSERT (Level < 3);
- if ((*Entry & TT_TYPE_MASK) != TT_TYPE_TABLE_ENTRY) {
+ if (!IsTableEntry (*Entry, Level)) {
//
// No table entry exists yet, so we need to allocate a page table
// for the next level.
@@ -221,7 +251,7 @@ UpdateRegionMappingRecursive (
InvalidateDataCacheRange (TranslationTable, EFI_PAGE_SIZE);
}
- if ((*Entry & TT_TYPE_MASK) == TT_TYPE_BLOCK_ENTRY) {
+ if (IsBlockEntry (*Entry, Level)) {
//
// We are splitting an existing block entry, so we have to populate
// the new table with the attributes of the block entry it replaces.
@@ -252,7 +282,7 @@ UpdateRegionMappingRecursive (
AttributeSetMask, AttributeClearMask, TranslationTable,
Level + 1);
if (EFI_ERROR (Status)) {
- if ((*Entry & TT_TYPE_MASK) != TT_TYPE_TABLE_ENTRY) {
+ if (!IsTableEntry (*Entry, Level)) {
//
// We are creating a new table entry, so on failure, we can free all
// allocations we made recursively, given that the whole subhierarchy
@@ -265,10 +295,10 @@ UpdateRegionMappingRecursive (
return Status;
}
- if ((*Entry & TT_TYPE_MASK) != TT_TYPE_TABLE_ENTRY) {
+ if (!IsTableEntry (*Entry, Level)) {
EntryValue = (UINTN)TranslationTable | TT_TYPE_TABLE_ENTRY;
ReplaceTableEntry (Entry, EntryValue, RegionStart,
- (*Entry & TT_TYPE_MASK) == TT_TYPE_BLOCK_ENTRY);
+ IsBlockEntry (*Entry, Level));
}
} else {
EntryValue = (*Entry & AttributeClearMask) | AttributeSetMask;
--
2.17.1