diff mbox series

[v1,08/20] arm64: add POIndex defines

Message ID 20230927140123.5283-9-joey.gouly@arm.com (mailing list archive)
State New, archived
Headers show
Series Permission Overlay Extension | expand

Commit Message

Joey Gouly Sept. 27, 2023, 2:01 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>
---
 arch/arm64/include/asm/pgtable-hwdef.h | 10 ++++++++++
 1 file changed, 10 insertions(+)
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Patch

diff --git a/arch/arm64/include/asm/pgtable-hwdef.h b/arch/arm64/include/asm/pgtable-hwdef.h
index e4944d517c99..fe270fa39110 100644
--- a/arch/arm64/include/asm/pgtable-hwdef.h
+++ b/arch/arm64/include/asm/pgtable-hwdef.h
@@ -178,6 +178,16 @@ 
 #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])
  */