From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-8.6 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 75C86ECE563 for ; Mon, 17 Sep 2018 04:43:58 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 2C86A214C3 for ; Mon, 17 Sep 2018 04:43:58 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="fWPa7lnI" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 2C86A214C3 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=gmail.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728358AbeIQKJc (ORCPT ); Mon, 17 Sep 2018 06:09:32 -0400 Received: from mail-pl1-f195.google.com ([209.85.214.195]:35149 "EHLO mail-pl1-f195.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727124AbeIQKJc (ORCPT ); Mon, 17 Sep 2018 06:09:32 -0400 Received: by mail-pl1-f195.google.com with SMTP id g2-v6so6805376plo.2 for ; Sun, 16 Sep 2018 21:43:55 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=C2IPggZWJw23xtNz6miFjfiCvmiToIusZWIrnQ3xks4=; b=fWPa7lnIHArkOlvyUHOBhX162dTRAAoUF1oYwLOfhNp4+eXPtrop6geXUOQq5a+5lF ILAeGyhhikrRlbk6CAF4iDSeCGgIyrHttdQu4U+wXxR0BU3Fukrau3Ds9AEDrgsmoVW/ CSUZpR/bkN7JXIVawSLa0pUhIB55mGM7/KaCUO5ZFs/WEkfyxtopugHUnQqSlVZuS48C YhvPgrPOhhmMb4trAYIU0GQJbDqa7Um5cNEIvO3vMcSb+Pecx5vyDCO1WYYMnqBakfkw cTc9un74lUjoWBLTOVvpv5rSZM6sKFjIErU9+pr53y75FCclZNxSJrQUvBJGQtxL9uX3 Nykg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=C2IPggZWJw23xtNz6miFjfiCvmiToIusZWIrnQ3xks4=; b=COHzLUCy9jGOwO6PqEqJ5IbXf0j5yrhuoOQwREcHjeW2WKtp7qg7OZ4lRStXwAf6sN N7Je0pLDQ79j6F+z47mqR5tB4a+tv+X5OXdN9IEqXWkIEqjZeYdXbs82L35hjyf8x0SA +ZK9W7rkoYN2+jUqZ3sDnVOr3WQiUjwptS9cDHGdTY1/jAoENPmvO/CcHNDJyjzR5UxS qU5J3ty+1cvlCXen/0P2BA0ZcEOZue7gp+qYwPQel3/AErTRZzcgcq/Ao2X4iCmN5Tia 4vUYahULpHGyj9IOdepLuvHfpZYguukcd9tb2f+Y565LEtUnYm3NCiH2gWbTc0tdc39j Dhew== X-Gm-Message-State: APzg51CfCoU0SzRtGI8dOb/3dv5OJKvQaMAHkhy+//dvEXLazNCxVIoj tNXH+XqLoX4X8ciL9G6d04I= X-Google-Smtp-Source: ANB0Vdb/WrmyS2PfMv5YT+CKO8vyh2DpkhRvLPFqb8KZHXF/5n7JJuR3RMJi3Hek5n5dLEomLFWVkg== X-Received: by 2002:a17:902:6a83:: with SMTP id n3-v6mr22798945plk.246.1537159434789; Sun, 16 Sep 2018 21:43:54 -0700 (PDT) Received: from toy.corp.qihoo.net ([104.192.108.9]) by smtp.gmail.com with ESMTPSA id l3-v6sm16876399pff.8.2018.09.16.21.43.51 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Sun, 16 Sep 2018 21:43:54 -0700 (PDT) From: Jun Yao To: linux-arm-kernel@lists.infradead.org Cc: catalin.marinas@arm.com, will.deacon@arm.com, james.morse@arm.com, linux-kernel@vger.kernel.org Subject: [PATCH v5 1/6] arm64/mm: Introduce the init_pg_dir. Date: Mon, 17 Sep 2018 12:43:28 +0800 Message-Id: <20180917044333.30051-2-yaojun8558363@gmail.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20180917044333.30051-1-yaojun8558363@gmail.com> References: <20180917044333.30051-1-yaojun8558363@gmail.com> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org To make the swapper_pg_dir read only, we will move it to the rodata section. And force the kernel to set up the initial page table in the init_pg_dir. After generating all levels page table, we copy only the top level into the swapper_pg_dir during paging_init(). In this patch, just add the init_pg_dir to vmlinux.lds.S and boiler-plate clearing/cleaning/invalidating it in head.S. Signed-off-by: Jun Yao --- arch/arm64/include/asm/assembler.h | 29 +++++++++++++++++++++++++++++ arch/arm64/kernel/head.S | 22 +++++++++++++++------- arch/arm64/kernel/vmlinux.lds.S | 8 ++++++++ 3 files changed, 52 insertions(+), 7 deletions(-) diff --git a/arch/arm64/include/asm/assembler.h b/arch/arm64/include/asm/assembler.h index 0bcc98dbba56..e7bdc324d538 100644 --- a/arch/arm64/include/asm/assembler.h +++ b/arch/arm64/include/asm/assembler.h @@ -456,6 +456,35 @@ USER(\label, ic ivau, \tmp2) // invalidate I line PoU b.ne 9998b .endm +/* + * clear_page - clear one page + * + * start: page aligned virtual address + */ + .macro clear_page, start:req +9996: stp xzr, xzr, [\start], #16 + stp xzr, xzr, [\start], #16 + stp xzr, xzr, [\start], #16 + stp xzr, xzr, [\start], #16 + tst \start, #(PAGE_SIZE - 1) + b.ne 9996b + .endm + +/* + * clear_pages - clear contiguous pages + * + * start, end: page aligned virtual addresses + */ + .macro clear_pages, start:req, end:req + sub \end, \end, \start + lsr \end, \end, #(PAGE_SHIFT) +9997: cbz \end, 9998f + clear_page \start + sub \end, \end, #1 + b 9997b +9998: + .endm + /* * Annotate a function as position independent, i.e., safe to be called before * the kernel virtual mapping is activated. diff --git a/arch/arm64/kernel/head.S b/arch/arm64/kernel/head.S index b0853069702f..2c83a8c47e3f 100644 --- a/arch/arm64/kernel/head.S +++ b/arch/arm64/kernel/head.S @@ -295,18 +295,21 @@ __create_page_tables: sub x1, x1, x0 bl __inval_dcache_area + adrp x0, init_pg_dir + adrp x1, init_pg_end + sub x1, x1, x0 + bl __inval_dcache_area + /* * Clear the idmap and swapper page tables. */ adrp x0, idmap_pg_dir adrp x1, swapper_pg_end - sub x1, x1, x0 -1: stp xzr, xzr, [x0], #16 - stp xzr, xzr, [x0], #16 - stp xzr, xzr, [x0], #16 - stp xzr, xzr, [x0], #16 - subs x1, x1, #64 - b.ne 1b + clear_pages x0, x1 + + adrp x0, init_pg_dir + adrp x1, init_pg_end + clear_pages x0, x1 mov x7, SWAPPER_MM_MMUFLAGS @@ -395,6 +398,11 @@ __create_page_tables: dmb sy bl __inval_dcache_area + adrp x0, init_pg_dir + adrp x1, init_pg_end + sub x1, x1, x0 + bl __inval_dcache_area + ret x28 ENDPROC(__create_page_tables) .ltorg diff --git a/arch/arm64/kernel/vmlinux.lds.S b/arch/arm64/kernel/vmlinux.lds.S index 605d1b60469c..612ffc0bbe11 100644 --- a/arch/arm64/kernel/vmlinux.lds.S +++ b/arch/arm64/kernel/vmlinux.lds.S @@ -68,6 +68,12 @@ jiffies = jiffies_64; #define TRAMP_TEXT #endif +#define INIT_PG_TABLES \ + . = ALIGN(PAGE_SIZE); \ + init_pg_dir = .; \ + . += SWAPPER_DIR_SIZE; \ + init_pg_end = .; + /* * The size of the PE/COFF section that covers the kernel image, which * runs from stext to _edata, must be a round multiple of the PE/COFF @@ -161,6 +167,8 @@ SECTIONS __inittext_end = .; __initdata_begin = .; + INIT_PG_TABLES + .init.data : { INIT_DATA INIT_SETUP(16) -- 2.17.1