From: jeremy.linton@arm.com (Jeremy Linton)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH 1/7] arm64: Add contiguous page flag shifts and constants
Date: Wed, 7 Oct 2015 12:00:19 -0500 [thread overview]
Message-ID: <1444237225-13802-2-git-send-email-jeremy.linton@arm.com> (raw)
In-Reply-To: <1444237225-13802-1-git-send-email-jeremy.linton@arm.com>
Add the number of pages required to form a contiguous range,
as well as some supporting constants.
Signed-off-by: Jeremy Linton <jeremy.linton@arm.com>
---
arch/arm64/include/asm/page.h | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)
diff --git a/arch/arm64/include/asm/page.h b/arch/arm64/include/asm/page.h
index 7d9c7e4..33892ef 100644
--- a/arch/arm64/include/asm/page.h
+++ b/arch/arm64/include/asm/page.h
@@ -20,14 +20,20 @@
#define __ASM_PAGE_H
/* PAGE_SHIFT determines the page size */
+/* CONT_SHIFT determines the number of pages which can be tracked together */
#ifdef CONFIG_ARM64_64K_PAGES
#define PAGE_SHIFT 16
+#define CONT_SHIFT 5
#else
#define PAGE_SHIFT 12
+#define CONT_SHIFT 4
#endif
-#define PAGE_SIZE (_AC(1,UL) << PAGE_SHIFT)
+#define PAGE_SIZE (_AC(1, UL) << PAGE_SHIFT)
#define PAGE_MASK (~(PAGE_SIZE-1))
+#define CONT_SIZE (_AC(1, UL) << (CONT_SHIFT + PAGE_SHIFT))
+#define CONT_MASK (~(CONT_SIZE-1))
+
/*
* The idmap and swapper page tables need some space reserved in the kernel
* image. Both require pgd, pud (4 levels only) and pmd tables to (section)
--
2.4.3
next prev parent reply other threads:[~2015-10-07 17:00 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-10-07 17:00 [PATCHv3 0/7] arm64: Use contiguous PTE bit for the kernel linear mapping Jeremy Linton
2015-10-07 17:00 ` Jeremy Linton [this message]
2015-10-07 17:00 ` [PATCH 2/7] arm64: PTE/PMD contiguous bit definition Jeremy Linton
2015-10-07 17:00 ` [PATCH 3/7] arm64: Macros to check/set/unset the contiguous bit Jeremy Linton
2015-10-07 17:00 ` [PATCH 4/7] arm64: Default kernel pages should be contiguous Jeremy Linton
2015-10-07 17:00 ` [PATCH 5/7] arm64: Make the kernel page dump utility aware of the CONT bit Jeremy Linton
2015-10-07 17:00 ` [PATCH 6/7] arm64: Add a kernel Kconfig option to enable contiguous PTE marking Jeremy Linton
2015-10-07 17:00 ` [PATCH 7/7] arm64: Mark kernel page ranges contiguous Jeremy Linton
2015-10-09 12:50 ` [PATCHv3 0/7] arm64: Use contiguous PTE bit for the kernel linear mapping Catalin Marinas
2015-10-09 15:00 ` Jeremy Linton
2015-11-17 15:37 ` Jeremy Linton
2015-11-18 11:01 ` Will Deacon
2015-11-18 14:10 ` Jeremy Linton
-- strict thread matches above, loose matches on Subject: below --
2015-10-02 20:47 [PATCHv2 " Jeremy Linton
2015-10-02 20:47 ` [PATCH 1/7] arm64: Add contiguous page flag shifts and constants Jeremy Linton
2015-09-16 19:02 [PATCH 0/7] arm64: Use contigous PTE bit for the kernel linear mapping Jeremy Linton
2015-09-16 19:03 ` [PATCH 1/7] arm64: Add contiguous page flag shifts and constants Jeremy Linton
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