From: "Ard Biesheuvel" <ard.biesheuvel@linaro.org>
To: devel@edk2.groups.io
Cc: leif@nuviainc.com, Ard Biesheuvel <ard.biesheuvel@linaro.org>
Subject: [PATCH 1/2] ArmPkg/ArmMmuLib AARCH64: use helpers to determine table entry types
Date: Sat, 7 Mar 2020 14:34:14 +0100 [thread overview]
Message-ID: <20200307133415.18857-2-ard.biesheuvel@linaro.org> (raw)
In-Reply-To: <20200307133415.18857-1-ard.biesheuvel@linaro.org>
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>
---
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 a43d468b73ca..6f6ef5b05fbc 100644
--- a/ArmPkg/Library/ArmMmuLib/AArch64/ArmMmuLibCore.c
+++ b/ArmPkg/Library/ArmMmuLib/AArch64/ArmMmuLibCore.c
@@ -156,6 +156,36 @@ 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 (
@@ -197,7 +227,7 @@ 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.
@@ -215,7 +245,7 @@ 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.
@@ -246,7 +276,7 @@ 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
@@ -259,10 +289,10 @@ 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
next prev parent reply other threads:[~2020-03-07 13:34 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-07 13:34 [PATCH 0/2] ArmPkg/ArmMmuLib AARCH64: correctness fix Ard Biesheuvel
2020-03-07 13:34 ` Ard Biesheuvel [this message]
2020-03-07 13:34 ` [PATCH 2/2] ArmPkg/ArmMmuLib AARCH64: preserve attributes when replacing a table entry Ard Biesheuvel
2020-03-10 0:29 ` [edk2-devel] " Laszlo Ersek
2020-03-25 9:40 ` Ard Biesheuvel
2020-03-09 13:16 ` [PATCH 0/2] ArmPkg/ArmMmuLib AARCH64: correctness fix Leif Lindholm
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