linux-kernel - [RFC V3 03/13] arm64/mm: Add FEAT_LPA2 specific TCR

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Date:   Thu, 30 Sep 2021 16:05:06 +0530
From:   Anshuman Khandual <anshuman.khandual@....com>
To:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Cc:     suzuki.poulose@....com, mark.rutland@....com, will@...nel.org,
        catalin.marinas@....com, maz@...nel.org, james.morse@....com,
        steven.price@....com, Anshuman Khandual <anshuman.khandual@....com>
Subject: [RFC V3 03/13] arm64/mm: Add FEAT_LPA2 specific TCR_EL1.DS field

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@....com>
Signed-off-by: Anshuman Khandual <anshuman.khandual@....com>
---
 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 66671ff..1eb5574 100644
--- a/arch/arm64/include/asm/pgtable-hwdef.h
+++ b/arch/arm64/include/asm/pgtable-hwdef.h
@@ -275,6 +275,7 @@
 #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.
-- 
2.7.4