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=-2.8 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,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 C808EC4321D for ; Wed, 22 Aug 2018 09:54:48 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 7993321480 for ; Wed, 22 Aug 2018 09:54:48 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="rV7ELI3t" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 7993321480 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 S1728754AbeHVNS5 (ORCPT ); Wed, 22 Aug 2018 09:18:57 -0400 Received: from mail-pg1-f196.google.com ([209.85.215.196]:36095 "EHLO mail-pg1-f196.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728698AbeHVNS4 (ORCPT ); Wed, 22 Aug 2018 09:18:56 -0400 Received: by mail-pg1-f196.google.com with SMTP id h17-v6so702049pgv.3 for ; Wed, 22 Aug 2018 02:54:45 -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=nGermj8+sJwPauBc9HZkgjRIgnvyjhqzrkyWK3pSIV0=; b=rV7ELI3trNOJJ+Usz+AKPNLYCZ79i7porRjGkA4rLCAKvWNjgTyhFP9C468f4z0gqS vHdP4+ZD1ogDBsjIZhZm5c9Br4R4AeLCBDfOFRy/9Golsk976H+fysrAp+CHdD7mC3Ap UFGHJ6/1n9WvY4eLc0TQ3uOInk3jLgFvucd9WQljg8HMvqaHC7X4NpPDOfxfvprBHiP/ 0629ETb4y1CKTxT0nbskyPmX0GFTKGDF4R/Ydlc0MpKr+pQw9i6piy3OvC32bKz+2YLj t/5OgsWL3cRucmn9FkJHky9uHzb0LD9WmuOJPUYt0r4KqGrX1asE77ViLPMXm6nm31Pz v4gQ== 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=nGermj8+sJwPauBc9HZkgjRIgnvyjhqzrkyWK3pSIV0=; b=QCWTOws1dxA3Jejso5D7COBz68qGr3HXKh+qAVU5df0T3swlidyYDmMvFXujUanNhy It79UTOKpNbn4X0TSyAKpKLZKUKz/bdrjPUiwNaHnjWzE/tPq7vmlaVpfQyuIAY69lHS MPFCVxnTT3mcjHMTMaqiKFkwmPcvDJVeu/+5/m20QtpYA1ySZwZic1gaY6vmgDns1coB VFPbC+cc9Asuq5kEppNvhnVahqXEhujfTRtuGKtCXL+fCxf4LF3XYKarVCrMTftokROe 538H6lzdx5zAYoe1+uMSc9cLIKnnikPzQ9qAScbcbx+fPN1WjW7RUURzK4sPp8hK0Fq3 X5pQ== X-Gm-Message-State: AOUpUlEJgaxIvlOBvEFBBnzKapFdIjv8MT2+7KxGyNr9nAHM27opN0dI Ie18/48ad8LSDbz3FGOi1+U= X-Google-Smtp-Source: AA+uWPz+1CgboKZ5x/OxT/pWO6AObRXZlcuEFTXtD9NZIoEFEZvMC5jaXm/YBG/E6KvKahVhwiBfXg== X-Received: by 2002:a62:be03:: with SMTP id l3-v6mr57028772pff.138.1534931685096; Wed, 22 Aug 2018 02:54:45 -0700 (PDT) Received: from toy.corp.qihoo.net ([104.192.108.9]) by smtp.gmail.com with ESMTPSA id z20-v6sm3126105pfd.99.2018.08.22.02.54.43 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Wed, 22 Aug 2018 02:54:44 -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: [RESEND PATCH v4 1/6] arm64/mm: Introduce the init_pg_dir. Date: Wed, 22 Aug 2018 17:54:27 +0800 Message-Id: <20180822095432.12125-2-yaojun8558363@gmail.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20180822095432.12125-1-yaojun8558363@gmail.com> References: <20180822095432.12125-1-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(). 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..eb363a915c0e 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 aligend 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..61d7cee3eaa6 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