From nobody Sat Nov 2 14:23:25 2024 Delivered-To: importer@patchew.org Received-SPF: none (zoho.com: 198.145.21.10 is neither permitted nor denied by domain of lists.01.org) client-ip=198.145.21.10; envelope-from=edk2-devel-bounces@lists.01.org; helo=ml01.01.org; Authentication-Results: mx.zoho.com; spf=none (zoho.com: 198.145.21.10 is neither permitted nor denied by domain of lists.01.org) smtp.mailfrom=edk2-devel-bounces@lists.01.org; Return-Path: Received: from ml01.01.org (ml01.01.org [198.145.21.10]) by mx.zohomail.com with SMTPS id 1488379361999462.9561165548863; Wed, 1 Mar 2017 06:42:41 -0800 (PST) Received: from [127.0.0.1] (localhost [IPv6:::1]) by ml01.01.org (Postfix) with ESMTP id 6F317821DC; Wed, 1 Mar 2017 06:42:37 -0800 (PST) Received: from mail-wm0-x234.google.com (mail-wm0-x234.google.com [IPv6:2a00:1450:400c:c09::234]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ml01.01.org (Postfix) with ESMTPS id B9AB4821D8 for ; Wed, 1 Mar 2017 06:42:35 -0800 (PST) Received: by mail-wm0-x234.google.com with SMTP id u199so38103594wmd.1 for ; Wed, 01 Mar 2017 06:42:35 -0800 (PST) Received: from localhost.localdomain ([105.147.1.203]) by smtp.gmail.com with ESMTPSA id h75sm6867958wrh.37.2017.03.01.06.42.32 (version=TLS1_2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Wed, 01 Mar 2017 06:42:33 -0800 (PST) X-Original-To: edk2-devel@lists.01.org DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=m2n2imfosOcNslejsrZvSriT9FxwW6MGByHquk5IRck=; b=IS7DH77yXU8c1pRFYXrNEh4UsnOf4xqVawIyVEpa21irMQf/D8mvjzwJ/lhBIAmEOg wywczPiTKwf8pPbcHzBLeqQIilnkGYSz7qnXWOUKhHFQQluqBWjTdFuFPglwMfQitqmm sdzu1RjSkIIDyM2g1beTsKFWIE1G2MRBnMxwY= 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=m2n2imfosOcNslejsrZvSriT9FxwW6MGByHquk5IRck=; b=rxJhAL4Roovb8OPhW/JzenH9QifK4o/4LgxyP9FRwZY4XFAh1+5UqOkC3nT5UZu0K4 t2sFD/QSbtiGPIJY6icDLTy+YPn0N+fg9GZm4EnIHNSdkQyUMjbqSZsfCsGt8sx3MHun Y/Ij9uxW6G4oi6xMmYFLI+n32aAhWILMNeJw5yws+FIX9/ZWxtICXVEAgy9y2lBB10ed dE39qpOGM86uDp121FUlTDoSEt20Edi/gea8R9P5dRKuw3LJIKTlbI/IAyV27MrEp57p NfCfoY755h0C4bK71gzjBUtOWm29A5jMvgXgSRFEMBl6DVWtKz8AnWF1kKwifhNACzAB orBQ== X-Gm-Message-State: AMke39lnOjFm5iEsTuEAnaJ04QyqYld0PEAC3k7/hz1nih5dSH1KMkQd/98IPPaKeI1+JtB3 X-Received: by 10.28.127.13 with SMTP id a13mr3649230wmd.96.1488379354182; Wed, 01 Mar 2017 06:42:34 -0800 (PST) From: Ard Biesheuvel To: edk2-devel@lists.01.org, leif.lindholm@linaro.org, lersek@redhat.com Date: Wed, 1 Mar 2017 14:42:23 +0000 Message-Id: <1488379344-16273-4-git-send-email-ard.biesheuvel@linaro.org> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1488379344-16273-1-git-send-email-ard.biesheuvel@linaro.org> References: <1488379344-16273-1-git-send-email-ard.biesheuvel@linaro.org> Subject: [edk2] [PATCH 3/4] ArmPkg/CpuDxe ARM: honour RO/XP attributes in SetMemoryAttributes() X-BeenThere: edk2-devel@lists.01.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: EDK II Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Ard Biesheuvel MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Errors-To: edk2-devel-bounces@lists.01.org Sender: "edk2-devel" X-ZohoMail: RSF_4 Z_629925259 SPT_0 Content-Type: text/plain; charset="utf-8" Enable the use of strict memory permissions on ARM by processing the EFI_MEMORY_RO and EFI_MEMORY_XP rather than ignoring them. As before, calls to CpuArchProtocol::SetMemoryAttributes that only set RO/XP bits will preserve the cacheability attributes. Permissions attributes are not preserved when setting the memory type only: the way the memory permission attributes are defined does not allows for that, and so this situation does not deviate from other architectures. Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Ard Biesheuvel --- ArmPkg/Drivers/CpuDxe/Arm/Mmu.c | 151 ++++++++------------ 1 file changed, 62 insertions(+), 89 deletions(-) diff --git a/ArmPkg/Drivers/CpuDxe/Arm/Mmu.c b/ArmPkg/Drivers/CpuDxe/Arm/Mm= u.c index fe0ddee447b0..6322d301060e 100644 --- a/ArmPkg/Drivers/CpuDxe/Arm/Mmu.c +++ b/ArmPkg/Drivers/CpuDxe/Arm/Mmu.c @@ -373,50 +373,41 @@ UpdatePageEntries ( =20 // EntryMask: bitmask of values to change (1 =3D change this value, 0 = =3D leave alone) // EntryValue: values at bit positions specified by EntryMask - EntryMask =3D TT_DESCRIPTOR_PAGE_TYPE_MASK; - EntryValue =3D TT_DESCRIPTOR_PAGE_TYPE_PAGE; + EntryMask =3D TT_DESCRIPTOR_PAGE_TYPE_MASK | TT_DESCRIPTOR_PAGE_AP_MASK; + if ((Attributes & EFI_MEMORY_XP) !=3D 0) { + EntryValue =3D TT_DESCRIPTOR_PAGE_TYPE_PAGE_XN; + } else { + EntryValue =3D TT_DESCRIPTOR_PAGE_TYPE_PAGE; + } + // Although the PI spec is unclear on this the GCD guarantees that only // one Attribute bit is set at a time, so we can safely use a switch sta= tement - switch (Attributes) { - case EFI_MEMORY_UC: - // modify cacheability attributes - EntryMask |=3D TT_DESCRIPTOR_PAGE_CACHE_POLICY_MASK; - // map to strongly ordered - EntryValue |=3D TT_DESCRIPTOR_PAGE_CACHE_POLICY_STRONGLY_ORDERED; //= TEX[2:0] =3D 0, C=3D0, B=3D0 - break; - - case EFI_MEMORY_WC: - // modify cacheability attributes - EntryMask |=3D TT_DESCRIPTOR_PAGE_CACHE_POLICY_MASK; - // map to normal non-cachable - EntryValue |=3D TT_DESCRIPTOR_PAGE_CACHE_POLICY_NON_CACHEABLE; // TE= X [2:0]=3D 001 =3D 0x2, B=3D0, C=3D0 - break; - - case EFI_MEMORY_WT: - // modify cacheability attributes - EntryMask |=3D TT_DESCRIPTOR_PAGE_CACHE_POLICY_MASK; - // write through with no-allocate - EntryValue |=3D TT_DESCRIPTOR_PAGE_CACHE_POLICY_WRITE_THROUGH_NO_ALL= OC; // TEX [2:0] =3D 0, C=3D1, B=3D0 - break; - - case EFI_MEMORY_WB: - // modify cacheability attributes - EntryMask |=3D TT_DESCRIPTOR_PAGE_CACHE_POLICY_MASK; - // write back (with allocate) - EntryValue |=3D TT_DESCRIPTOR_PAGE_CACHE_POLICY_WRITE_BACK_ALLOC; //= TEX [2:0] =3D 001, C=3D1, B=3D1 - break; - - case EFI_MEMORY_WP: - case EFI_MEMORY_XP: - case EFI_MEMORY_UCE: - // cannot be implemented UEFI definition unclear for ARM - // Cause a page fault if these ranges are accessed. - EntryValue =3D TT_DESCRIPTOR_PAGE_TYPE_FAULT; - DEBUG ((EFI_D_PAGE, "SetMemoryAttributes(): setting page %lx with un= supported attribute %x will page fault on access\n", BaseAddress, Attribute= s)); - break; + if ((Attributes & EFI_MEMORY_UC) !=3D 0) { + // modify cacheability attributes + EntryMask |=3D TT_DESCRIPTOR_PAGE_CACHE_POLICY_MASK; + // map to strongly ordered + EntryValue |=3D TT_DESCRIPTOR_PAGE_CACHE_POLICY_STRONGLY_ORDERED; // T= EX[2:0] =3D 0, C=3D0, B=3D0 + } else if ((Attributes & EFI_MEMORY_WC) !=3D 0) { + // modify cacheability attributes + EntryMask |=3D TT_DESCRIPTOR_PAGE_CACHE_POLICY_MASK; + // map to normal non-cachable + EntryValue |=3D TT_DESCRIPTOR_PAGE_CACHE_POLICY_NON_CACHEABLE; // TEX = [2:0]=3D 001 =3D 0x2, B=3D0, C=3D0 + } else if ((Attributes & EFI_MEMORY_WT) !=3D 0) { + // modify cacheability attributes + EntryMask |=3D TT_DESCRIPTOR_PAGE_CACHE_POLICY_MASK; + // write through with no-allocate + EntryValue |=3D TT_DESCRIPTOR_PAGE_CACHE_POLICY_WRITE_THROUGH_NO_ALLOC= ; // TEX [2:0] =3D 0, C=3D1, B=3D0 + } else if ((Attributes & EFI_MEMORY_WB) !=3D 0) { + // modify cacheability attributes + EntryMask |=3D TT_DESCRIPTOR_PAGE_CACHE_POLICY_MASK; + // write back (with allocate) + EntryValue |=3D TT_DESCRIPTOR_PAGE_CACHE_POLICY_WRITE_BACK_ALLOC; // T= EX [2:0] =3D 001, C=3D1, B=3D1 + } =20 - default: - return EFI_UNSUPPORTED; + if ((Attributes & EFI_MEMORY_RO) !=3D 0) { + EntryValue |=3D TT_DESCRIPTOR_PAGE_AP_RO_RO; + } else { + EntryValue |=3D TT_DESCRIPTOR_PAGE_AP_RW_RW; } =20 // Obtain page table base @@ -515,53 +506,42 @@ UpdateSectionEntries ( // EntryValue: values at bit positions specified by EntryMask =20 // Make sure we handle a section range that is unmapped - EntryMask =3D TT_DESCRIPTOR_SECTION_TYPE_MASK; + EntryMask =3D TT_DESCRIPTOR_SECTION_TYPE_MASK | TT_DESCRIPTOR_SECTION_XN= _MASK | + TT_DESCRIPTOR_SECTION_AP_MASK; EntryValue =3D TT_DESCRIPTOR_SECTION_TYPE_SECTION; =20 // Although the PI spec is unclear on this the GCD guarantees that only // one Attribute bit is set at a time, so we can safely use a switch sta= tement - switch(Attributes) { - case EFI_MEMORY_UC: - // modify cacheability attributes - EntryMask |=3D TT_DESCRIPTOR_SECTION_CACHE_POLICY_MASK; - // map to strongly ordered - EntryValue |=3D TT_DESCRIPTOR_SECTION_CACHE_POLICY_STRONGLY_ORDERED;= // TEX[2:0] =3D 0, C=3D0, B=3D0 - break; - - case EFI_MEMORY_WC: - // modify cacheability attributes - EntryMask |=3D TT_DESCRIPTOR_SECTION_CACHE_POLICY_MASK; - // map to normal non-cachable - EntryValue |=3D TT_DESCRIPTOR_SECTION_CACHE_POLICY_NON_CACHEABLE; //= TEX [2:0]=3D 001 =3D 0x2, B=3D0, C=3D0 - break; - - case EFI_MEMORY_WT: - // modify cacheability attributes - EntryMask |=3D TT_DESCRIPTOR_SECTION_CACHE_POLICY_MASK; - // write through with no-allocate - EntryValue |=3D TT_DESCRIPTOR_SECTION_CACHE_POLICY_WRITE_THROUGH_NO_= ALLOC; // TEX [2:0] =3D 0, C=3D1, B=3D0 - break; - - case EFI_MEMORY_WB: - // modify cacheability attributes - EntryMask |=3D TT_DESCRIPTOR_SECTION_CACHE_POLICY_MASK; - // write back (with allocate) - EntryValue |=3D TT_DESCRIPTOR_SECTION_CACHE_POLICY_WRITE_BACK_ALLOC;= // TEX [2:0] =3D 001, C=3D1, B=3D1 - break; - - case EFI_MEMORY_WP: - case EFI_MEMORY_XP: - case EFI_MEMORY_RP: - case EFI_MEMORY_UCE: - // cannot be implemented UEFI definition unclear for ARM - // Cause a page fault if these ranges are accessed. - EntryValue =3D TT_DESCRIPTOR_SECTION_TYPE_FAULT; - DEBUG ((EFI_D_PAGE, "SetMemoryAttributes(): setting section %lx with= unsupported attribute %x will page fault on access\n", BaseAddress, Attrib= utes)); - break; + if ((Attributes & EFI_MEMORY_UC) !=3D 0) { + // modify cacheability attributes + EntryMask |=3D TT_DESCRIPTOR_SECTION_CACHE_POLICY_MASK; + // map to strongly ordered + EntryValue |=3D TT_DESCRIPTOR_SECTION_CACHE_POLICY_STRONGLY_ORDERED; /= / TEX[2:0] =3D 0, C=3D0, B=3D0 + } else if ((Attributes & EFI_MEMORY_WC) !=3D 0) { + // modify cacheability attributes + EntryMask |=3D TT_DESCRIPTOR_SECTION_CACHE_POLICY_MASK; + // map to normal non-cachable + EntryValue |=3D TT_DESCRIPTOR_SECTION_CACHE_POLICY_NON_CACHEABLE; // T= EX [2:0]=3D 001 =3D 0x2, B=3D0, C=3D0 + } else if ((Attributes & EFI_MEMORY_WT) !=3D 0) { + // modify cacheability attributes + EntryMask |=3D TT_DESCRIPTOR_SECTION_CACHE_POLICY_MASK; + // write through with no-allocate + EntryValue |=3D TT_DESCRIPTOR_SECTION_CACHE_POLICY_WRITE_THROUGH_NO_AL= LOC; // TEX [2:0] =3D 0, C=3D1, B=3D0 + } else if ((Attributes & EFI_MEMORY_WB) !=3D 0) { + // modify cacheability attributes + EntryMask |=3D TT_DESCRIPTOR_SECTION_CACHE_POLICY_MASK; + // write back (with allocate) + EntryValue |=3D TT_DESCRIPTOR_SECTION_CACHE_POLICY_WRITE_BACK_ALLOC; /= / TEX [2:0] =3D 001, C=3D1, B=3D1 + } =20 + if ((Attributes & EFI_MEMORY_RO) !=3D 0) { + EntryValue |=3D TT_DESCRIPTOR_SECTION_AP_RO_RO; + } else { + EntryValue |=3D TT_DESCRIPTOR_SECTION_AP_RW_RW; + } =20 - default: - return EFI_UNSUPPORTED; + if ((Attributes & EFI_MEMORY_XP) !=3D 0) { + EntryValue |=3D TT_DESCRIPTOR_SECTION_XN_MASK; } =20 // obtain page table base @@ -682,13 +662,6 @@ SetMemoryAttributes ( UINT64 ChunkLength; BOOLEAN FlushTlbs; =20 - // - // Ignore invocations that only modify permission bits - // - if ((Attributes & EFI_MEMORY_CACHETYPE_MASK) =3D=3D 0) { - return EFI_SUCCESS; - } - FlushTlbs =3D FALSE; while (Length > 0) { if ((BaseAddress % TT_DESCRIPTOR_SECTION_SIZE =3D=3D 0) && --=20 2.7.4 _______________________________________________ edk2-devel mailing list edk2-devel@lists.01.org https://lists.01.org/mailman/listinfo/edk2-devel