280 lines
7.0 KiB
C
280 lines
7.0 KiB
C
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/*
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* Copyright (C) 2011 Tobias Klauser <tklauser@distanz.ch>
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* Copyright (C) 2009 Wind River Systems Inc
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*
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* Based on asm/pgtable-32.h from mips which is:
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*
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* Copyright (C) 1994, 95, 96, 97, 98, 99, 2000, 2003 Ralf Baechle
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* Copyright (C) 1999, 2000, 2001 Silicon Graphics, Inc.
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*/
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#ifndef _ASM_NIOS2_PGTABLE_H
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#define _ASM_NIOS2_PGTABLE_H
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#include <linux/io.h>
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#include <linux/bug.h>
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#include <asm/page.h>
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#include <asm/cacheflush.h>
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#include <asm/tlbflush.h>
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#include <asm/pgtable-bits.h>
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#include <asm-generic/pgtable-nopmd.h>
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#define VMALLOC_START CONFIG_NIOS2_KERNEL_MMU_REGION_BASE
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#define VMALLOC_END (CONFIG_NIOS2_KERNEL_REGION_BASE - 1)
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struct mm_struct;
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/* Helper macro */
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#define MKP(x, w, r) __pgprot(_PAGE_PRESENT | _PAGE_CACHED | \
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((x) ? _PAGE_EXEC : 0) | \
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((r) ? _PAGE_READ : 0) | \
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((w) ? _PAGE_WRITE : 0))
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/*
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* These are the macros that generic kernel code needs
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* (to populate protection_map[])
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*/
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/* Remove W bit on private pages for COW support */
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/* Shared pages can have exact HW mapping */
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/* Used all over the kernel */
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#define PAGE_KERNEL __pgprot(_PAGE_PRESENT | _PAGE_CACHED | _PAGE_READ | \
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_PAGE_WRITE | _PAGE_EXEC | _PAGE_GLOBAL)
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#define PAGE_SHARED __pgprot(_PAGE_PRESENT | _PAGE_CACHED | _PAGE_READ | \
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_PAGE_WRITE | _PAGE_ACCESSED)
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#define PAGE_COPY MKP(0, 0, 1)
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#define PTRS_PER_PGD (PAGE_SIZE / sizeof(pgd_t))
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#define PTRS_PER_PTE (PAGE_SIZE / sizeof(pte_t))
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#define USER_PTRS_PER_PGD \
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(CONFIG_NIOS2_KERNEL_MMU_REGION_BASE / PGDIR_SIZE)
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#define PGDIR_SHIFT 22
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#define PGDIR_SIZE (1UL << PGDIR_SHIFT)
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#define PGDIR_MASK (~(PGDIR_SIZE-1))
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/*
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* ZERO_PAGE is a global shared page that is always zero: used
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* for zero-mapped memory areas etc..
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*/
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extern unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)];
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#define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page))
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extern pgd_t swapper_pg_dir[PTRS_PER_PGD];
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extern pte_t invalid_pte_table[PAGE_SIZE/sizeof(pte_t)];
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/*
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* (pmds are folded into puds so this doesn't get actually called,
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* but the define is needed for a generic inline function.)
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*/
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static inline void set_pmd(pmd_t *pmdptr, pmd_t pmdval)
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{
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*pmdptr = pmdval;
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}
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static inline int pte_write(pte_t pte) \
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{ return pte_val(pte) & _PAGE_WRITE; }
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static inline int pte_dirty(pte_t pte) \
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{ return pte_val(pte) & _PAGE_DIRTY; }
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static inline int pte_young(pte_t pte) \
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{ return pte_val(pte) & _PAGE_ACCESSED; }
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#define pgprot_noncached pgprot_noncached
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static inline pgprot_t pgprot_noncached(pgprot_t _prot)
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{
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unsigned long prot = pgprot_val(_prot);
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prot &= ~_PAGE_CACHED;
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return __pgprot(prot);
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}
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static inline int pte_none(pte_t pte)
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{
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return !(pte_val(pte) & ~(_PAGE_GLOBAL|0xf));
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}
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static inline int pte_present(pte_t pte) \
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{ return pte_val(pte) & _PAGE_PRESENT; }
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/*
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* The following only work if pte_present() is true.
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* Undefined behaviour if not..
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*/
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static inline pte_t pte_wrprotect(pte_t pte)
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{
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pte_val(pte) &= ~_PAGE_WRITE;
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return pte;
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}
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static inline pte_t pte_mkclean(pte_t pte)
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{
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pte_val(pte) &= ~_PAGE_DIRTY;
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return pte;
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}
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static inline pte_t pte_mkold(pte_t pte)
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{
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pte_val(pte) &= ~_PAGE_ACCESSED;
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return pte;
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}
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static inline pte_t pte_mkwrite(pte_t pte)
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{
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pte_val(pte) |= _PAGE_WRITE;
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return pte;
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}
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static inline pte_t pte_mkdirty(pte_t pte)
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{
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pte_val(pte) |= _PAGE_DIRTY;
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return pte;
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}
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static inline pte_t pte_mkyoung(pte_t pte)
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{
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pte_val(pte) |= _PAGE_ACCESSED;
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return pte;
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}
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static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
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{
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const unsigned long mask = _PAGE_READ | _PAGE_WRITE | _PAGE_EXEC;
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pte_val(pte) = (pte_val(pte) & ~mask) | (pgprot_val(newprot) & mask);
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return pte;
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}
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static inline int pmd_present(pmd_t pmd)
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{
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return (pmd_val(pmd) != (unsigned long) invalid_pte_table)
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&& (pmd_val(pmd) != 0UL);
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}
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static inline void pmd_clear(pmd_t *pmdp)
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{
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pmd_val(*pmdp) = (unsigned long) invalid_pte_table;
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}
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#define pte_pfn(pte) (pte_val(pte) & 0xfffff)
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#define pfn_pte(pfn, prot) (__pte(pfn | pgprot_val(prot)))
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#define pte_page(pte) (pfn_to_page(pte_pfn(pte)))
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/*
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* Store a linux PTE into the linux page table.
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*/
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static inline void set_pte(pte_t *ptep, pte_t pteval)
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{
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*ptep = pteval;
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}
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static inline void set_pte_at(struct mm_struct *mm, unsigned long addr,
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pte_t *ptep, pte_t pteval)
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{
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unsigned long paddr = (unsigned long)page_to_virt(pte_page(pteval));
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flush_dcache_range(paddr, paddr + PAGE_SIZE);
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set_pte(ptep, pteval);
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}
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static inline int pmd_none(pmd_t pmd)
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{
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return (pmd_val(pmd) ==
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(unsigned long) invalid_pte_table) || (pmd_val(pmd) == 0UL);
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}
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#define pmd_bad(pmd) (pmd_val(pmd) & ~PAGE_MASK)
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static inline void pte_clear(struct mm_struct *mm,
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unsigned long addr, pte_t *ptep)
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{
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pte_t null;
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pte_val(null) = (addr >> PAGE_SHIFT) & 0xf;
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set_pte_at(mm, addr, ptep, null);
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}
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/*
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* Conversion functions: convert a page and protection to a page entry,
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* and a page entry and page directory to the page they refer to.
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*/
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#define mk_pte(page, prot) (pfn_pte(page_to_pfn(page), prot))
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/*
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* Conversion functions: convert a page and protection to a page entry,
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* and a page entry and page directory to the page they refer to.
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*/
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#define pmd_phys(pmd) virt_to_phys((void *)pmd_val(pmd))
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#define pmd_pfn(pmd) (pmd_phys(pmd) >> PAGE_SHIFT)
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#define pmd_page(pmd) (pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT))
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static inline unsigned long pmd_page_vaddr(pmd_t pmd)
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{
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return pmd_val(pmd);
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}
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#define pte_ERROR(e) \
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pr_err("%s:%d: bad pte %08lx.\n", \
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__FILE__, __LINE__, pte_val(e))
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#define pgd_ERROR(e) \
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pr_err("%s:%d: bad pgd %08lx.\n", \
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__FILE__, __LINE__, pgd_val(e))
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/*
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* Encode/decode swap entries and swap PTEs. Swap PTEs are all PTEs that
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* are !pte_none() && !pte_present().
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*
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* Format of swap PTEs:
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*
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* 3 3 2 2 2 2 2 2 2 2 2 2 1 1 1 1 1 1 1 1 1 1
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* 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0
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* E < type -> 0 0 0 0 0 0 <-------------- offset --------------->
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*
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* E is the exclusive marker that is not stored in swap entries.
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*
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* Note that the offset field is always non-zero if the swap type is 0, thus
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* !pte_none() is always true.
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*/
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#define __swp_type(swp) (((swp).val >> 26) & 0x1f)
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#define __swp_offset(swp) ((swp).val & 0xfffff)
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#define __swp_entry(type, off) ((swp_entry_t) { (((type) & 0x1f) << 26) \
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| ((off) & 0xfffff) })
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#define __swp_entry_to_pte(swp) ((pte_t) { (swp).val })
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#define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) })
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static inline int pte_swp_exclusive(pte_t pte)
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{
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return pte_val(pte) & _PAGE_SWP_EXCLUSIVE;
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}
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static inline pte_t pte_swp_mkexclusive(pte_t pte)
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{
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pte_val(pte) |= _PAGE_SWP_EXCLUSIVE;
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return pte;
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}
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static inline pte_t pte_swp_clear_exclusive(pte_t pte)
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{
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pte_val(pte) &= ~_PAGE_SWP_EXCLUSIVE;
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return pte;
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}
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extern void __init paging_init(void);
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extern void __init mmu_init(void);
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extern void update_mmu_cache(struct vm_area_struct *vma,
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unsigned long address, pte_t *pte);
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#endif /* _ASM_NIOS2_PGTABLE_H */
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