From: Jeremy Linton <jeremy.linton@arm.com>
To: linux-arm-kernel@lists.infradead.org
Cc: catalin.marinas@arm.com, will.deacon@arm.com,
linux-kernel@vger.kernel.org, dwoods@ezcip.com,
steve.capper@arm.com, shijie.huang@arm.com,
Jeremy Linton <jeremy.linton@arm.com>
Subject: [PATCH 1/7] arm64: Add contiguous page flag shifts and constants
Date: Wed, 16 Sep 2015 14:03:00 -0500 [thread overview]
Message-ID: <1442430186-9083-2-git-send-email-jeremy.linton@arm.com> (raw)
In-Reply-To: <1442430186-9083-1-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:[~2015-09-16 19:03 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
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 ` Jeremy Linton [this message]
2015-09-16 19:03 ` [PATCH 2/7] arm64: Shorten lines which exceed 80 characters Jeremy Linton
2015-09-17 9:45 ` Catalin Marinas
2015-09-16 19:03 ` [PATCH 3/7] arm64: PTE/PMD contiguous bit definition Jeremy Linton
2015-09-16 19:03 ` [PATCH 4/7] arm64: Macros to check/set/unset the contiguous bit Jeremy Linton
2015-09-16 19:03 ` [PATCH 5/7] arm64: Default kernel pages should be contiguous Jeremy Linton
2015-09-16 19:03 ` [PATCH 6/7] arm64: Make the kernel page dump utility aware of the CONT bit Jeremy Linton
2015-09-18 7:02 ` Huang Shijie
2015-09-18 8:35 ` Huang Shijie
2015-09-16 19:03 ` [PATCH 7/7] arm64: Mark kernel page ranges contiguous Jeremy Linton
2015-09-17 17:23 ` Steve Capper
2015-09-17 17:33 ` Jeremy Linton
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=1442430186-9083-2-git-send-email-jeremy.linton@arm.com \
--to=jeremy.linton@arm.com \
--cc=catalin.marinas@arm.com \
--cc=dwoods@ezcip.com \
--cc=linux-arm-kernel@lists.infradead.org \
--cc=linux-kernel@vger.kernel.org \
--cc=shijie.huang@arm.com \
--cc=steve.capper@arm.com \
--cc=will.deacon@arm.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).