288 lines
9.5 KiB
C
288 lines
9.5 KiB
C
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/*
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* arch/arm/include/asm/pgtable-3level.h
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*
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* Copyright (C) 2011 ARM Ltd.
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* Author: Catalin Marinas <catalin.marinas@arm.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#ifndef _ASM_PGTABLE_3LEVEL_H
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#define _ASM_PGTABLE_3LEVEL_H
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/*
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* With LPAE, there are 3 levels of page tables. Each level has 512 entries of
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* 8 bytes each, occupying a 4K page. The first level table covers a range of
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* 512GB, each entry representing 1GB. Since we are limited to 4GB input
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* address range, only 4 entries in the PGD are used.
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*
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* There are enough spare bits in a page table entry for the kernel specific
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* state.
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*/
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#define PTRS_PER_PTE 512
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#define PTRS_PER_PMD 512
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#define PTRS_PER_PGD 4
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#define PTE_HWTABLE_PTRS (0)
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#define PTE_HWTABLE_OFF (0)
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#define PTE_HWTABLE_SIZE (PTRS_PER_PTE * sizeof(u64))
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/*
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* PGDIR_SHIFT determines the size a top-level page table entry can map.
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*/
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#define PGDIR_SHIFT 30
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/*
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* PMD_SHIFT determines the size a middle-level page table entry can map.
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*/
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#define PMD_SHIFT 21
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#define PMD_SIZE (1UL << PMD_SHIFT)
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#define PMD_MASK (~((1 << PMD_SHIFT) - 1))
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#define PGDIR_SIZE (1UL << PGDIR_SHIFT)
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#define PGDIR_MASK (~((1 << PGDIR_SHIFT) - 1))
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/*
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* section address mask and size definitions.
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*/
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#define SECTION_SHIFT 21
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#define SECTION_SIZE (1UL << SECTION_SHIFT)
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#define SECTION_MASK (~((1 << SECTION_SHIFT) - 1))
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#define USER_PTRS_PER_PGD (PAGE_OFFSET / PGDIR_SIZE)
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/*
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* Hugetlb definitions.
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*/
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#define HPAGE_SHIFT PMD_SHIFT
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#define HPAGE_SIZE (_AC(1, UL) << HPAGE_SHIFT)
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#define HPAGE_MASK (~(HPAGE_SIZE - 1))
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#define HUGETLB_PAGE_ORDER (HPAGE_SHIFT - PAGE_SHIFT)
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/*
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* "Linux" PTE definitions for LPAE.
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*
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* These bits overlap with the hardware bits but the naming is preserved for
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* consistency with the classic page table format.
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*/
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#define L_PTE_VALID (_AT(pteval_t, 1) << 0) /* Valid */
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#define L_PTE_PRESENT (_AT(pteval_t, 3) << 0) /* Present */
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#define L_PTE_USER (_AT(pteval_t, 1) << 6) /* AP[1] */
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#define L_PTE_SHARED (_AT(pteval_t, 3) << 8) /* SH[1:0], inner shareable */
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#define L_PTE_YOUNG (_AT(pteval_t, 1) << 10) /* AF */
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#define L_PTE_XN (_AT(pteval_t, 1) << 54) /* XN */
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#define L_PTE_DIRTY (_AT(pteval_t, 1) << 55)
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#define L_PTE_SPECIAL (_AT(pteval_t, 1) << 56)
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#define L_PTE_NONE (_AT(pteval_t, 1) << 57) /* PROT_NONE */
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#define L_PTE_RDONLY (_AT(pteval_t, 1) << 58) /* READ ONLY */
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#define L_PMD_SECT_VALID (_AT(pmdval_t, 1) << 0)
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#define L_PMD_SECT_DIRTY (_AT(pmdval_t, 1) << 55)
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#define L_PMD_SECT_NONE (_AT(pmdval_t, 1) << 57)
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#define L_PMD_SECT_RDONLY (_AT(pteval_t, 1) << 58)
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/*
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* To be used in assembly code with the upper page attributes.
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*/
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#define L_PTE_XN_HIGH (1 << (54 - 32))
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#define L_PTE_DIRTY_HIGH (1 << (55 - 32))
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/*
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* AttrIndx[2:0] encoding (mapping attributes defined in the MAIR* registers).
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*/
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#define L_PTE_MT_UNCACHED (_AT(pteval_t, 0) << 2) /* strongly ordered */
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#define L_PTE_MT_BUFFERABLE (_AT(pteval_t, 1) << 2) /* normal non-cacheable */
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#define L_PTE_MT_WRITETHROUGH (_AT(pteval_t, 2) << 2) /* normal inner write-through */
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#define L_PTE_MT_WRITEBACK (_AT(pteval_t, 3) << 2) /* normal inner write-back */
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#define L_PTE_MT_WRITEALLOC (_AT(pteval_t, 7) << 2) /* normal inner write-alloc */
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#define L_PTE_MT_DEV_SHARED (_AT(pteval_t, 4) << 2) /* device */
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#define L_PTE_MT_DEV_NONSHARED (_AT(pteval_t, 4) << 2) /* device */
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#define L_PTE_MT_DEV_WC (_AT(pteval_t, 1) << 2) /* normal non-cacheable */
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#define L_PTE_MT_DEV_CACHED (_AT(pteval_t, 3) << 2) /* normal inner write-back */
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#define L_PTE_MT_MASK (_AT(pteval_t, 7) << 2)
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/*
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* Software PGD flags.
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*/
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#define L_PGD_SWAPPER (_AT(pgdval_t, 1) << 55) /* swapper_pg_dir entry */
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/*
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* 2nd stage PTE definitions for LPAE.
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*/
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#define L_PTE_S2_MT_UNCACHED (_AT(pteval_t, 0x0) << 2) /* strongly ordered */
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#define L_PTE_S2_MT_WRITETHROUGH (_AT(pteval_t, 0xa) << 2) /* normal inner write-through */
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#define L_PTE_S2_MT_WRITEBACK (_AT(pteval_t, 0xf) << 2) /* normal inner write-back */
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#define L_PTE_S2_MT_DEV_SHARED (_AT(pteval_t, 0x1) << 2) /* device */
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#define L_PTE_S2_MT_MASK (_AT(pteval_t, 0xf) << 2)
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#define L_PTE_S2_RDONLY (_AT(pteval_t, 1) << 6) /* HAP[1] */
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#define L_PTE_S2_RDWR (_AT(pteval_t, 3) << 6) /* HAP[2:1] */
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#define L_PMD_S2_RDONLY (_AT(pmdval_t, 1) << 6) /* HAP[1] */
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#define L_PMD_S2_RDWR (_AT(pmdval_t, 3) << 6) /* HAP[2:1] */
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/*
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* Hyp-mode PL2 PTE definitions for LPAE.
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*/
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#define L_PTE_HYP L_PTE_USER
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#ifndef __ASSEMBLY__
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#define pud_none(pud) (!pud_val(pud))
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#define pud_bad(pud) (!(pud_val(pud) & 2))
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#define pud_present(pud) (pud_val(pud))
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#define pmd_table(pmd) ((pmd_val(pmd) & PMD_TYPE_MASK) == \
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PMD_TYPE_TABLE)
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#define pmd_sect(pmd) ((pmd_val(pmd) & PMD_TYPE_MASK) == \
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PMD_TYPE_SECT)
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#define pmd_large(pmd) pmd_sect(pmd)
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#define pud_clear(pudp) \
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do { \
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*pudp = __pud(0); \
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clean_pmd_entry(pudp); \
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} while (0)
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#define set_pud(pudp, pud) \
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do { \
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*pudp = pud; \
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flush_pmd_entry(pudp); \
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} while (0)
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static inline pmd_t *pud_page_vaddr(pud_t pud)
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{
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return __va(pud_val(pud) & PHYS_MASK & (s32)PAGE_MASK);
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}
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/* Find an entry in the second-level page table.. */
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#define pmd_index(addr) (((addr) >> PMD_SHIFT) & (PTRS_PER_PMD - 1))
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static inline pmd_t *pmd_offset(pud_t *pud, unsigned long addr)
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{
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return (pmd_t *)pud_page_vaddr(*pud) + pmd_index(addr);
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}
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#define pmd_bad(pmd) (!(pmd_val(pmd) & 2))
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#define copy_pmd(pmdpd,pmdps) \
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do { \
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*pmdpd = *pmdps; \
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flush_pmd_entry(pmdpd); \
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} while (0)
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#define pmd_clear(pmdp) \
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do { \
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*pmdp = __pmd(0); \
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clean_pmd_entry(pmdp); \
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} while (0)
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/*
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* For 3 levels of paging the PTE_EXT_NG bit will be set for user address ptes
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* that are written to a page table but not for ptes created with mk_pte.
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*
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* In hugetlb_no_page, a new huge pte (new_pte) is generated and passed to
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* hugetlb_cow, where it is compared with an entry in a page table.
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* This comparison test fails erroneously leading ultimately to a memory leak.
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*
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* To correct this behaviour, we mask off PTE_EXT_NG for any pte that is
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* present before running the comparison.
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*/
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#define __HAVE_ARCH_PTE_SAME
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#define pte_same(pte_a,pte_b) ((pte_present(pte_a) ? pte_val(pte_a) & ~PTE_EXT_NG \
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: pte_val(pte_a)) \
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== (pte_present(pte_b) ? pte_val(pte_b) & ~PTE_EXT_NG \
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: pte_val(pte_b)))
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#define set_pte_ext(ptep,pte,ext) cpu_set_pte_ext(ptep,__pte(pte_val(pte)|(ext)))
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#define pte_huge(pte) (pte_val(pte) && !(pte_val(pte) & PTE_TABLE_BIT))
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#define pte_mkhuge(pte) (__pte(pte_val(pte) & ~PTE_TABLE_BIT))
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#define pmd_isset(pmd, val) ((u32)(val) == (val) ? pmd_val(pmd) & (val) \
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: !!(pmd_val(pmd) & (val)))
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#define pmd_isclear(pmd, val) (!(pmd_val(pmd) & (val)))
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#define pmd_present(pmd) (pmd_isset((pmd), L_PMD_SECT_VALID))
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#define pmd_young(pmd) (pmd_isset((pmd), PMD_SECT_AF))
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#define pte_special(pte) (pte_isset((pte), L_PTE_SPECIAL))
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static inline pte_t pte_mkspecial(pte_t pte)
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{
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pte_val(pte) |= L_PTE_SPECIAL;
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return pte;
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}
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#define __HAVE_ARCH_PTE_SPECIAL
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#define __HAVE_ARCH_PMD_WRITE
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#define pmd_write(pmd) (pmd_isclear((pmd), L_PMD_SECT_RDONLY))
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#define pmd_dirty(pmd) (pmd_isset((pmd), L_PMD_SECT_DIRTY))
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#define pud_page(pud) pmd_page(__pmd(pud_val(pud)))
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#define pud_write(pud) pmd_write(__pmd(pud_val(pud)))
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#define pmd_hugewillfault(pmd) (!pmd_young(pmd) || !pmd_write(pmd))
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#define pmd_thp_or_huge(pmd) (pmd_huge(pmd) || pmd_trans_huge(pmd))
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#ifdef CONFIG_TRANSPARENT_HUGEPAGE
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#define pmd_trans_huge(pmd) (pmd_val(pmd) && !pmd_table(pmd))
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#endif
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#define PMD_BIT_FUNC(fn,op) \
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static inline pmd_t pmd_##fn(pmd_t pmd) { pmd_val(pmd) op; return pmd; }
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PMD_BIT_FUNC(wrprotect, |= L_PMD_SECT_RDONLY);
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PMD_BIT_FUNC(mkold, &= ~PMD_SECT_AF);
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PMD_BIT_FUNC(mkwrite, &= ~L_PMD_SECT_RDONLY);
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PMD_BIT_FUNC(mkdirty, |= L_PMD_SECT_DIRTY);
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PMD_BIT_FUNC(mkclean, &= ~L_PMD_SECT_DIRTY);
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PMD_BIT_FUNC(mkyoung, |= PMD_SECT_AF);
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#define pmd_mkhuge(pmd) (__pmd(pmd_val(pmd) & ~PMD_TABLE_BIT))
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#define pmd_pfn(pmd) (((pmd_val(pmd) & PMD_MASK) & PHYS_MASK) >> PAGE_SHIFT)
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#define pfn_pmd(pfn,prot) (__pmd(((phys_addr_t)(pfn) << PAGE_SHIFT) | pgprot_val(prot)))
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#define mk_pmd(page,prot) pfn_pmd(page_to_pfn(page),prot)
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/* represent a notpresent pmd by faulting entry, this is used by pmdp_invalidate */
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static inline pmd_t pmd_mknotpresent(pmd_t pmd)
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{
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return __pmd(pmd_val(pmd) & ~L_PMD_SECT_VALID);
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}
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static inline pmd_t pmd_modify(pmd_t pmd, pgprot_t newprot)
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{
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const pmdval_t mask = PMD_SECT_USER | PMD_SECT_XN | L_PMD_SECT_RDONLY |
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L_PMD_SECT_VALID | L_PMD_SECT_NONE;
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pmd_val(pmd) = (pmd_val(pmd) & ~mask) | (pgprot_val(newprot) & mask);
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return pmd;
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}
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static inline void set_pmd_at(struct mm_struct *mm, unsigned long addr,
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pmd_t *pmdp, pmd_t pmd)
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{
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BUG_ON(addr >= TASK_SIZE);
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/* create a faulting entry if PROT_NONE protected */
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if (pmd_val(pmd) & L_PMD_SECT_NONE)
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pmd_val(pmd) &= ~L_PMD_SECT_VALID;
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if (pmd_write(pmd) && pmd_dirty(pmd))
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pmd_val(pmd) &= ~PMD_SECT_AP2;
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else
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pmd_val(pmd) |= PMD_SECT_AP2;
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*pmdp = __pmd(pmd_val(pmd) | PMD_SECT_nG);
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flush_pmd_entry(pmdp);
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}
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#endif /* __ASSEMBLY__ */
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#endif /* _ASM_PGTABLE_3LEVEL_H */
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