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Message-Id: <20180702210451.16057-2-nkela@cisco.com>
Date: Mon, 2 Jul 2018 14:04:51 -0700
From: Nikunj Kela <nkela@...co.com>
To: Catalin Marinas <catalin.marinas@....com>,
Will Deacon <will.deacon@....com>
Cc: xe-kernel@...ernal.cisco.com, linux-arm-kernel@...ts.infradead.org,
linux-kernel@...r.kernel.org
Subject: [PATCH 2/2] arm64: add support for 43bit physical address
This patch adds support for 43bit physical address. Additionally,
this patch adds support for 27bit section size. This is useful in
reducing kernel memory usage. One usecase is in kdump kernel.
Cc: xe-kernel@...ernal.cisco.com
Cc: Nikunj Kela <nkela@...co.com>
Signed-off-by: Nikunj Kela <nkela@...co.com>
---
arch/arm64/Kconfig | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index edf327f..76d0bfb 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -665,6 +665,9 @@ choice
Choose the maximum physical address range that the kernel will
support.
+config ARM64_PA_BITS_43
+ bool "43-bit"
+
config ARM64_PA_BITS_48
bool "48-bit"
@@ -684,6 +687,7 @@ endchoice
config ARM64_PA_BITS
int
+ default 43 if ARM64_PA_BITS_43
default 48 if ARM64_PA_BITS_48
default 52 if ARM64_PA_BITS_52
@@ -693,6 +697,9 @@ choice
help
Choose the maximum amount of memory in a section.
+config ARM64_SEC_BITS_27
+ bool "27-bit"
+
config ARM64_SEC_BITS_30
bool "30-bit"
@@ -700,6 +707,7 @@ endchoice
config ARM64_SEC_BITS
int
+ default 27 if ARM64_SEC_BITS_27
default 30 if ARM64_SEC_BITS_30
config CPU_BIG_ENDIAN
--
2.5.0
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