arm64: Add support for LPA2 at stage1 and WXN

[PATCH v3 41/60] arm64/mm: Add FEAT_LPA2 specific TCR_EL1.DS field

Posted by Ard Biesheuvel 2 years, 9 months ago

From: Anshuman Khandual <anshuman.khandual@arm.com>

As per ARM ARM (0487G.A) TCR_EL1.DS fields controls whether 52 bit input
and output address get supported on 4K and 16K page size configuration,
when FEAT_LPA2 is known to have been implemented. This adds TCR_DS field
definition which would be used when FEAT_LPA2 gets enabled.

Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com>
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
---
 arch/arm64/include/asm/pgtable-hwdef.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm64/include/asm/pgtable-hwdef.h b/arch/arm64/include/asm/pgtable-hwdef.h
index f658aafc47dfa29a..c4ad7fbb12c5c07a 100644
--- a/arch/arm64/include/asm/pgtable-hwdef.h
+++ b/arch/arm64/include/asm/pgtable-hwdef.h
@@ -276,6 +276,7 @@
 #define TCR_E0PD1		(UL(1) << 56)
 #define TCR_TCMA0		(UL(1) << 57)
 #define TCR_TCMA1		(UL(1) << 58)
+#define TCR_DS			(UL(1) << 59)
 
 /*
  * TTBR.
-- 
2.39.2