From 44eaacf1b8999b15cec89bd9d9cd989da4798d53 Mon Sep 17 00:00:00 2001
From: "Suzuki K. Poulose" <suzuki.poulose@arm.com>
Date: Mon, 19 Oct 2015 14:19:37 +0100
Subject: arm64: Add 16K page size support

This patch turns on the 16K page support in the kernel. We
support 48bit VA (4 level page tables) and 47bit VA (3 level
page tables).

With 16K we can map 128 entries using contiguous bit hint
at level 3 to map 2M using single TLB entry.

TODO: 16K supports 32 contiguous entries at level 2 to get us
1G(which is not yet supported by the infrastructure). That should
be a separate patch altogether.

Cc: Will Deacon <will.deacon@arm.com>
Cc: Jeremy Linton <jeremy.linton@arm.com>
Cc: Marc Zyngier <marc.zyngier@arm.com>
Cc: Christoffer Dall <christoffer.dall@linaro.org>
Cc: Steve Capper <steve.capper@linaro.org>
Signed-off-by: Suzuki K. Poulose <suzuki.poulose@arm.com>
Reviewed-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Tested-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Acked-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
---
 arch/arm64/include/asm/page.h        | 3 +++
 arch/arm64/include/asm/sysreg.h      | 3 +++
 arch/arm64/include/asm/thread_info.h | 2 ++
 3 files changed, 8 insertions(+)

(limited to 'arch/arm64/include/asm')

diff --git a/arch/arm64/include/asm/page.h b/arch/arm64/include/asm/page.h
index da3235494ffd..9b2f5a9d019d 100644
--- a/arch/arm64/include/asm/page.h
+++ b/arch/arm64/include/asm/page.h
@@ -24,6 +24,9 @@
 #ifdef CONFIG_ARM64_64K_PAGES
 #define PAGE_SHIFT		16
 #define CONT_SHIFT		5
+#elif defined(CONFIG_ARM64_16K_PAGES)
+#define PAGE_SHIFT		14
+#define CONT_SHIFT		7
 #else
 #define PAGE_SHIFT		12
 #define CONT_SHIFT		4
diff --git a/arch/arm64/include/asm/sysreg.h b/arch/arm64/include/asm/sysreg.h
index d59cb231a673..4b57e1080538 100644
--- a/arch/arm64/include/asm/sysreg.h
+++ b/arch/arm64/include/asm/sysreg.h
@@ -59,6 +59,9 @@
 #if defined(CONFIG_ARM64_4K_PAGES)
 #define ID_AA64MMFR0_TGRAN_SHIFT	ID_AA64MMFR0_TGRAN4_SHIFT
 #define ID_AA64MMFR0_TGRAN_SUPPORTED	ID_AA64MMFR0_TGRAN4_SUPPORTED
+#elif defined(CONFIG_ARM64_16K_PAGES)
+#define ID_AA64MMFR0_TGRAN_SHIFT	ID_AA64MMFR0_TGRAN16_SHIFT
+#define ID_AA64MMFR0_TGRAN_SUPPORTED	ID_AA64MMFR0_TGRAN16_SUPPORTED
 #elif defined(CONFIG_ARM64_64K_PAGES)
 #define ID_AA64MMFR0_TGRAN_SHIFT	ID_AA64MMFR0_TGRAN64_SHIFT
 #define ID_AA64MMFR0_TGRAN_SUPPORTED	ID_AA64MMFR0_TGRAN64_SUPPORTED
diff --git a/arch/arm64/include/asm/thread_info.h b/arch/arm64/include/asm/thread_info.h
index 5eac6a2300af..90c7ff233735 100644
--- a/arch/arm64/include/asm/thread_info.h
+++ b/arch/arm64/include/asm/thread_info.h
@@ -25,6 +25,8 @@
 
 #ifdef CONFIG_ARM64_4K_PAGES
 #define THREAD_SIZE_ORDER	2
+#elif defined(CONFIG_ARM64_16K_PAGES)
+#define THREAD_SIZE_ORDER	0
 #endif
 
 #define THREAD_SIZE		16384
-- 
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