arch/arm/include/asm/pgtable-3level.h

/*
 * arch/arm/include/asm/pgtable-3level.h
 *
 * Copyright (C) 2011 ARM Ltd.
 * Author: Catalin Marinas <catalin.marinas@arm.com>
 *
 * 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_H
#define _ASM_PGTABLE_3LEVEL_H

/*
 * With LPAE, there are 3 levels of page tables. Each level has 512 entries of
 * 8 bytes each, occupying a 4K page. The first level table covers a range of
 * 512GB, each entry representing 1GB. Since we are limited to 4GB input
 * address range, only 4 entries in the PGD are used.
 *
 * There are enough spare bits in a page table entry for the kernel specific
 * state.
 */
#define PTRS_PER_PTE		512
#define PTRS_PER_PMD		512
#define PTRS_PER_PGD		4

#define PTE_HWTABLE_PTRS	(PTRS_PER_PTE)
#define PTE_HWTABLE_OFF		(0)
#define PTE_HWTABLE_SIZE	(PTRS_PER_PTE * sizeof(u64))

/*
 * PGDIR_SHIFT determines the size a top-level page table entry can map.
 */
#define PGDIR_SHIFT		30

/*
 * PMD_SHIFT determines the size a middle-level page table entry can map.
 */
#define PMD_SHIFT		21

#define PMD_SIZE		(1UL << PMD_SHIFT)
#define PMD_MASK		(~(PMD_SIZE-1))
#define PGDIR_SIZE		(1UL << PGDIR_SHIFT)
#define PGDIR_MASK		(~(PGDIR_SIZE-1))

/*
 * section address mask and size definitions.
 */
#define SECTION_SHIFT		21
#define SECTION_SIZE		(1UL << SECTION_SHIFT)
#define SECTION_MASK		(~(SECTION_SIZE-1))

#define USER_PTRS_PER_PGD	(PAGE_OFFSET / PGDIR_SIZE)

/*
 * "Linux" PTE definitions for LPAE.
 *
 * These bits overlap with the hardware bits but the naming is preserved for
 * consistency with the classic page table format.
 */
#define L_PTE_PRESENT		(_AT(pteval_t, 3) << 0)		/* Valid */
#define L_PTE_FILE		(_AT(pteval_t, 1) << 2)		/* only when !PRESENT */
#define L_PTE_BUFFERABLE	(_AT(pteval_t, 1) << 2)		/* AttrIndx[0] */
#define L_PTE_CACHEABLE		(_AT(pteval_t, 1) << 3)		/* AttrIndx[1] */
#define L_PTE_USER		(_AT(pteval_t, 1) << 6)		/* AP[1] */
#define L_PTE_RDONLY		(_AT(pteval_t, 1) << 7)		/* AP[2] */
#define L_PTE_SHARED		(_AT(pteval_t, 3) << 8)		/* SH[1:0], inner shareable */
#define L_PTE_YOUNG		(_AT(pteval_t, 1) << 10)	/* AF */
#define L_PTE_XN		(_AT(pteval_t, 1) << 54)	/* XN */
#define L_PTE_DIRTY		(_AT(pteval_t, 1) << 55)	/* unused */
#define L_PTE_SPECIAL		(_AT(pteval_t, 1) << 56)	/* unused */

/*
 * To be used in assembly code with the upper page attributes.
 */
#define L_PTE_XN_HIGH		(1 << (54 - 32))
#define L_PTE_DIRTY_HIGH	(1 << (55 - 32))

/*
 * AttrIndx[2:0] encoding (mapping attributes defined in the MAIR* registers).
 */
#define L_PTE_MT_UNCACHED	(_AT(pteval_t, 0) << 2)	/* strongly ordered */
#define L_PTE_MT_BUFFERABLE	(_AT(pteval_t, 1) << 2)	/* normal non-cacheable */
#define L_PTE_MT_WRITETHROUGH	(_AT(pteval_t, 2) << 2)	/* normal inner write-through */
#define L_PTE_MT_WRITEBACK	(_AT(pteval_t, 3) << 2)	/* normal inner write-back */
#define L_PTE_MT_WRITEALLOC	(_AT(pteval_t, 7) << 2)	/* normal inner write-alloc */
#define L_PTE_MT_DEV_SHARED	(_AT(pteval_t, 4) << 2)	/* device */
#define L_PTE_MT_DEV_NONSHARED	(_AT(pteval_t, 4) << 2)	/* device */
#define L_PTE_MT_DEV_WC		(_AT(pteval_t, 1) << 2)	/* normal non-cacheable */
#define L_PTE_MT_DEV_CACHED	(_AT(pteval_t, 3) << 2)	/* normal inner write-back */
#define L_PTE_MT_MASK		(_AT(pteval_t, 7) << 2)

#endif /* _ASM_PGTABLE_3LEVEL_H */