diff mbox series

[v5,13/30] arm64: add POIndex defines

Message ID 20240822151113.1479789-14-joey.gouly@arm.com
State Accepted
Commit b66db4f3ccde2fe960ff2d7bb64fe8933e2db7b3
Headers show
Series Permission Overlay Extension | expand

Commit Message

Joey Gouly Aug. 22, 2024, 3:10 p.m. UTC 
The 3-bit POIndex is stored in the PTE at bits 60..62.

Signed-off-by: Joey Gouly <joey.gouly@arm.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Will Deacon <will@kernel.org>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
---
 arch/arm64/include/asm/pgtable-hwdef.h | 10 ++++++++++
 1 file changed, 10 insertions(+)
diff mbox series

Patch

diff --git arch/arm64/include/asm/pgtable-hwdef.h arch/arm64/include/asm/pgtable-hwdef.h
index 1f60aa1bc750..3f0c3f5c5cef 100644
--- arch/arm64/include/asm/pgtable-hwdef.h
+++ arch/arm64/include/asm/pgtable-hwdef.h
@@ -199,6 +199,16 @@ 
 #define PTE_PI_IDX_2	53	/* PXN */
 #define PTE_PI_IDX_3	54	/* UXN */
 
+/*
+ * POIndex[2:0] encoding (Permission Overlay Extension)
+ */
+#define PTE_PO_IDX_0	(_AT(pteval_t, 1) << 60)
+#define PTE_PO_IDX_1	(_AT(pteval_t, 1) << 61)
+#define PTE_PO_IDX_2	(_AT(pteval_t, 1) << 62)
+
+#define PTE_PO_IDX_MASK		GENMASK_ULL(62, 60)
+
+
 /*
  * Memory Attribute override for Stage-2 (MemAttr[3:0])
  */