[PATCH v4 12/29] arm64: add POIndex defines

[Joey Gouly]

The 3-bit POIndex is stored in the PTE at bits 60..62.

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

diff --git a/arch/arm64/include/asm/pgtable-hwdef.h b/arch/arm64/include/asm/pgtable-hwdef.h
index ef207a0d4f0d..370a02922fe1 100644
--- a/arch/arm64/include/asm/pgtable-hwdef.h
+++ b/arch/arm64/include/asm/pgtable-hwdef.h
@@ -198,6 +198,16 @@
 #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])
  */
-- 
2.25.1