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260 lines
6.6 KiB
260 lines
6.6 KiB
/* |
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* Copyright (C) 2011 Tobias Klauser <[email protected]> |
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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 and decode a swap entry (must be !pte_none(pte) && !pte_present(pte): |
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* |
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* 31 30 29 28 27 26 25 24 23 22 21 20 19 18 ... 1 0 |
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* 0 0 0 0 type. 0 0 0 0 0 0 offset......... |
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* |
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* This gives us up to 2**2 = 4 swap files and 2**20 * 4K = 4G per swap file. |
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* |
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* Note that the offset field is always non-zero, thus !pte_none(pte) is always |
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* true. |
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*/ |
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#define __swp_type(swp) (((swp).val >> 26) & 0x3) |
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#define __swp_offset(swp) ((swp).val & 0xfffff) |
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#define __swp_entry(type, off) ((swp_entry_t) { (((type) & 0x3) << 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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#define kern_addr_valid(addr) (1) |
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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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