Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758136Ab0KOSfG (ORCPT ); Mon, 15 Nov 2010 13:35:06 -0500 Received: from caramon.arm.linux.org.uk ([78.32.30.218]:47776 "EHLO caramon.arm.linux.org.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757108Ab0KOSfF (ORCPT ); Mon, 15 Nov 2010 13:35:05 -0500 Date: Mon, 15 Nov 2010 18:34:43 +0000 From: Russell King - ARM Linux To: Catalin Marinas Cc: linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH v2 06/20] ARM: LPAE: Introduce the 3-level page table format definitions Message-ID: <20101115183443.GE31421@n2100.arm.linux.org.uk> References: <1289584840-18097-1-git-send-email-catalin.marinas@arm.com> <1289584840-18097-7-git-send-email-catalin.marinas@arm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1289584840-18097-7-git-send-email-catalin.marinas@arm.com> User-Agent: Mutt/1.5.19 (2009-01-05) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 5051 Lines: 134 On Fri, Nov 12, 2010 at 06:00:26PM +0000, Catalin Marinas wrote: > This patch introduces the pgtable-3level*.h files with definitions > specific to the LPAE page table format (3 levels of page tables). > > Each table is 4KB and has 512 64-bit entries. An entry can point to a > 40-bit physical address. The young, write and exec software bits share > the corresponding hardware bits (negated). Other software bits use spare > bits in the PTE. > > The patch also changes some variable types from unsigned long or int to > pteval_t or pgprot_t. > > Signed-off-by: Catalin Marinas > --- > arch/arm/include/asm/page.h | 4 + > arch/arm/include/asm/pgtable-3level-hwdef.h | 78 ++++++++++++++++++ > arch/arm/include/asm/pgtable-3level-types.h | 55 +++++++++++++ > arch/arm/include/asm/pgtable-3level.h | 113 +++++++++++++++++++++++++++ > arch/arm/include/asm/pgtable-hwdef.h | 4 + > arch/arm/include/asm/pgtable.h | 6 +- > arch/arm/mm/mm.h | 8 +- > arch/arm/mm/mmu.c | 2 +- > 8 files changed, 264 insertions(+), 6 deletions(-) > create mode 100644 arch/arm/include/asm/pgtable-3level-hwdef.h > create mode 100644 arch/arm/include/asm/pgtable-3level-types.h > create mode 100644 arch/arm/include/asm/pgtable-3level.h > > diff --git a/arch/arm/include/asm/page.h b/arch/arm/include/asm/page.h > index 3848105..e5124db 100644 > --- a/arch/arm/include/asm/page.h > +++ b/arch/arm/include/asm/page.h > @@ -151,7 +151,11 @@ extern void __cpu_copy_user_highpage(struct page *to, struct page *from, > #define clear_page(page) memset((void *)(page), 0, PAGE_SIZE) > extern void copy_page(void *to, const void *from); > > +#ifdef CONFIG_ARM_LPAE > +#include > +#else > #include > +#endif > > #endif /* CONFIG_MMU */ > > diff --git a/arch/arm/include/asm/pgtable-3level-hwdef.h b/arch/arm/include/asm/pgtable-3level-hwdef.h > new file mode 100644 > index 0000000..2f99c3c > --- /dev/null > +++ b/arch/arm/include/asm/pgtable-3level-hwdef.h > @@ -0,0 +1,78 @@ > +/* > + * arch/arm/include/asm/pgtable-3level-hwdef.h > + * > + * Copyright (C) 2010 ARM Ltd. > + * > + * This program is free software; you can redistribute it and/or modify > + * it under the terms of the GNU General Public License version 2 as > + * published by the Free Software Foundation. > + * > + * This program is distributed in the hope that it will be useful, > + * but WITHOUT ANY WARRANTY; without even the implied warranty of > + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the > + * GNU General Public License for more details. > + * > + * You should have received a copy of the GNU General Public License > + * along with this program; if not, write to the Free Software > + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA > + */ > +#ifndef _ASM_PGTABLE_3LEVEL_HWDEF_H > +#define _ASM_PGTABLE_3LEVEL_HWDEF_H > + > +#include > +#include > + > +/* > + * Hardware page table definitions. > + * > + * + Level 1/2 descriptor > + * - common > + */ > +#define PMD_TYPE_MASK (_AT(pmd_t, 3) << 0) > +#define PMD_TYPE_FAULT (_AT(pmd_t, 0) << 0) > +#define PMD_TYPE_TABLE (_AT(pmd_t, 3) << 0) > +#define PMD_TYPE_SECT (_AT(pmd_t, 1) << 0) > +#define PMD_BIT4 (_AT(pmd_t, 0)) > +#define PMD_DOMAIN(x) (_AT(pmd_t, 0)) It is really not correct to have these constants type'd as pmd_t. The idea behind pmd_t et.al. is to detect when normal arithmetic or logical operations are performed on page table entries when the accessors instead should be used. By typing these as pmd_t, it means operations need to be: u32 pmdval = pmd_val(foo) | pmd_val(PMD_TYE_TABLE); which is obviously more complicated than is needed. > diff --git a/arch/arm/mm/mm.h b/arch/arm/mm/mm.h > index 6630620..a62f093 100644 > --- a/arch/arm/mm/mm.h > +++ b/arch/arm/mm/mm.h > @@ -16,10 +16,10 @@ static inline pmd_t *pmd_off_k(unsigned long virt) > } > > struct mem_type { > - unsigned int prot_pte; > - unsigned int prot_l1; > - unsigned int prot_sect; > - unsigned int domain; > + pgprot_t prot_pte; > + pgprot_t prot_l1; > + pgprot_t prot_sect; > + pgprot_t domain; Again, this is wrong. There's an accessor for pgprot_t typed data. This causes code to violate it. > diff --git a/arch/arm/mm/mmu.c b/arch/arm/mm/mmu.c > index 0ca33dd..7c803c4 100644 > --- a/arch/arm/mm/mmu.c > +++ b/arch/arm/mm/mmu.c > @@ -292,7 +292,7 @@ static void __init build_mem_type_table(void) > { > struct cachepolicy *cp; > unsigned int cr = get_cr(); > - unsigned int user_pgprot, kern_pgprot, vecs_pgprot; > + pgprot_t user_pgprot, kern_pgprot, vecs_pgprot; Ditto. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/