| /* |
| * Copyright (C) 2011 Tobias Klauser <tklauser@distanz.ch> |
| * Copyright (C) 2009 Wind River Systems Inc |
| * |
| * Based on asm/pgtable-32.h from mips which is: |
| * |
| * Copyright (C) 1994, 95, 96, 97, 98, 99, 2000, 2003 Ralf Baechle |
| * Copyright (C) 1999, 2000, 2001 Silicon Graphics, Inc. |
| * |
| * This file is subject to the terms and conditions of the GNU General Public |
| * License. See the file "COPYING" in the main directory of this archive |
| * for more details. |
| */ |
| |
| #ifndef _ASM_NIOS2_PGTABLE_H |
| #define _ASM_NIOS2_PGTABLE_H |
| |
| #include <linux/io.h> |
| #include <linux/bug.h> |
| #include <asm/page.h> |
| #include <asm/cacheflush.h> |
| #include <asm/tlbflush.h> |
| |
| #include <asm/pgtable-bits.h> |
| #include <asm-generic/pgtable-nopmd.h> |
| |
| #define VMALLOC_START CONFIG_NIOS2_KERNEL_MMU_REGION_BASE |
| #define VMALLOC_END (CONFIG_NIOS2_KERNEL_REGION_BASE - 1) |
| |
| struct mm_struct; |
| |
| /* Helper macro */ |
| #define MKP(x, w, r) __pgprot(_PAGE_PRESENT | _PAGE_CACHED | \ |
| ((x) ? _PAGE_EXEC : 0) | \ |
| ((r) ? _PAGE_READ : 0) | \ |
| ((w) ? _PAGE_WRITE : 0)) |
| /* |
| * These are the macros that generic kernel code needs |
| * (to populate protection_map[]) |
| */ |
| |
| /* Remove W bit on private pages for COW support */ |
| #define __P000 MKP(0, 0, 0) |
| #define __P001 MKP(0, 0, 1) |
| #define __P010 MKP(0, 0, 0) /* COW */ |
| #define __P011 MKP(0, 0, 1) /* COW */ |
| #define __P100 MKP(1, 0, 0) |
| #define __P101 MKP(1, 0, 1) |
| #define __P110 MKP(1, 0, 0) /* COW */ |
| #define __P111 MKP(1, 0, 1) /* COW */ |
| |
| /* Shared pages can have exact HW mapping */ |
| #define __S000 MKP(0, 0, 0) |
| #define __S001 MKP(0, 0, 1) |
| #define __S010 MKP(0, 1, 0) |
| #define __S011 MKP(0, 1, 1) |
| #define __S100 MKP(1, 0, 0) |
| #define __S101 MKP(1, 0, 1) |
| #define __S110 MKP(1, 1, 0) |
| #define __S111 MKP(1, 1, 1) |
| |
| /* Used all over the kernel */ |
| #define PAGE_KERNEL __pgprot(_PAGE_PRESENT | _PAGE_CACHED | _PAGE_READ | \ |
| _PAGE_WRITE | _PAGE_EXEC | _PAGE_GLOBAL) |
| |
| #define PAGE_SHARED __pgprot(_PAGE_PRESENT | _PAGE_CACHED | _PAGE_READ | \ |
| _PAGE_WRITE | _PAGE_ACCESSED) |
| |
| #define PAGE_COPY MKP(0, 0, 1) |
| |
| #define PGD_ORDER 0 |
| #define PTE_ORDER 0 |
| |
| #define PTRS_PER_PGD ((PAGE_SIZE << PGD_ORDER) / sizeof(pgd_t)) |
| #define PTRS_PER_PTE ((PAGE_SIZE << PTE_ORDER) / sizeof(pte_t)) |
| |
| #define USER_PTRS_PER_PGD \ |
| (CONFIG_NIOS2_KERNEL_MMU_REGION_BASE / PGDIR_SIZE) |
| |
| #define PGDIR_SHIFT 22 |
| #define PGDIR_SIZE (1UL << PGDIR_SHIFT) |
| #define PGDIR_MASK (~(PGDIR_SIZE-1)) |
| |
| /* |
| * ZERO_PAGE is a global shared page that is always zero: used |
| * for zero-mapped memory areas etc.. |
| */ |
| extern unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)]; |
| #define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page)) |
| |
| extern pgd_t swapper_pg_dir[PTRS_PER_PGD]; |
| extern pte_t invalid_pte_table[PAGE_SIZE/sizeof(pte_t)]; |
| |
| /* |
| * (pmds are folded into puds so this doesn't get actually called, |
| * but the define is needed for a generic inline function.) |
| */ |
| static inline void set_pmd(pmd_t *pmdptr, pmd_t pmdval) |
| { |
| *pmdptr = pmdval; |
| } |
| |
| static inline int pte_write(pte_t pte) \ |
| { return pte_val(pte) & _PAGE_WRITE; } |
| static inline int pte_dirty(pte_t pte) \ |
| { return pte_val(pte) & _PAGE_DIRTY; } |
| static inline int pte_young(pte_t pte) \ |
| { return pte_val(pte) & _PAGE_ACCESSED; } |
| |
| #define pgprot_noncached pgprot_noncached |
| |
| static inline pgprot_t pgprot_noncached(pgprot_t _prot) |
| { |
| unsigned long prot = pgprot_val(_prot); |
| |
| prot &= ~_PAGE_CACHED; |
| |
| return __pgprot(prot); |
| } |
| |
| static inline int pte_none(pte_t pte) |
| { |
| return !(pte_val(pte) & ~(_PAGE_GLOBAL|0xf)); |
| } |
| |
| static inline int pte_present(pte_t pte) \ |
| { return pte_val(pte) & _PAGE_PRESENT; } |
| |
| /* |
| * The following only work if pte_present() is true. |
| * Undefined behaviour if not.. |
| */ |
| static inline pte_t pte_wrprotect(pte_t pte) |
| { |
| pte_val(pte) &= ~_PAGE_WRITE; |
| return pte; |
| } |
| |
| static inline pte_t pte_mkclean(pte_t pte) |
| { |
| pte_val(pte) &= ~_PAGE_DIRTY; |
| return pte; |
| } |
| |
| static inline pte_t pte_mkold(pte_t pte) |
| { |
| pte_val(pte) &= ~_PAGE_ACCESSED; |
| return pte; |
| } |
| |
| static inline pte_t pte_mkwrite(pte_t pte) |
| { |
| pte_val(pte) |= _PAGE_WRITE; |
| return pte; |
| } |
| |
| static inline pte_t pte_mkdirty(pte_t pte) |
| { |
| pte_val(pte) |= _PAGE_DIRTY; |
| return pte; |
| } |
| |
| static inline pte_t pte_mkyoung(pte_t pte) |
| { |
| pte_val(pte) |= _PAGE_ACCESSED; |
| return pte; |
| } |
| |
| static inline pte_t pte_modify(pte_t pte, pgprot_t newprot) |
| { |
| const unsigned long mask = _PAGE_READ | _PAGE_WRITE | _PAGE_EXEC; |
| |
| pte_val(pte) = (pte_val(pte) & ~mask) | (pgprot_val(newprot) & mask); |
| return pte; |
| } |
| |
| static inline int pmd_present(pmd_t pmd) |
| { |
| return (pmd_val(pmd) != (unsigned long) invalid_pte_table) |
| && (pmd_val(pmd) != 0UL); |
| } |
| |
| static inline void pmd_clear(pmd_t *pmdp) |
| { |
| pmd_val(*pmdp) = (unsigned long) invalid_pte_table; |
| } |
| |
| #define pte_pfn(pte) (pte_val(pte) & 0xfffff) |
| #define pfn_pte(pfn, prot) (__pte(pfn | pgprot_val(prot))) |
| #define pte_page(pte) (pfn_to_page(pte_pfn(pte))) |
| |
| /* |
| * Store a linux PTE into the linux page table. |
| */ |
| static inline void set_pte(pte_t *ptep, pte_t pteval) |
| { |
| *ptep = pteval; |
| } |
| |
| static inline void set_pte_at(struct mm_struct *mm, unsigned long addr, |
| pte_t *ptep, pte_t pteval) |
| { |
| unsigned long paddr = (unsigned long)page_to_virt(pte_page(pteval)); |
| |
| flush_dcache_range(paddr, paddr + PAGE_SIZE); |
| set_pte(ptep, pteval); |
| } |
| |
| static inline int pmd_none(pmd_t pmd) |
| { |
| return (pmd_val(pmd) == |
| (unsigned long) invalid_pte_table) || (pmd_val(pmd) == 0UL); |
| } |
| |
| #define pmd_bad(pmd) (pmd_val(pmd) & ~PAGE_MASK) |
| |
| static inline void pte_clear(struct mm_struct *mm, |
| unsigned long addr, pte_t *ptep) |
| { |
| pte_t null; |
| |
| pte_val(null) = (addr >> PAGE_SHIFT) & 0xf; |
| |
| set_pte_at(mm, addr, ptep, null); |
| } |
| |
| /* |
| * Conversion functions: convert a page and protection to a page entry, |
| * and a page entry and page directory to the page they refer to. |
| */ |
| #define mk_pte(page, prot) (pfn_pte(page_to_pfn(page), prot)) |
| |
| /* |
| * Conversion functions: convert a page and protection to a page entry, |
| * and a page entry and page directory to the page they refer to. |
| */ |
| #define pmd_phys(pmd) virt_to_phys((void *)pmd_val(pmd)) |
| #define pmd_pfn(pmd) (pmd_phys(pmd) >> PAGE_SHIFT) |
| #define pmd_page(pmd) (pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT)) |
| |
| static inline unsigned long pmd_page_vaddr(pmd_t pmd) |
| { |
| return pmd_val(pmd); |
| } |
| |
| #define pte_ERROR(e) \ |
| pr_err("%s:%d: bad pte %08lx.\n", \ |
| __FILE__, __LINE__, pte_val(e)) |
| #define pgd_ERROR(e) \ |
| pr_err("%s:%d: bad pgd %08lx.\n", \ |
| __FILE__, __LINE__, pgd_val(e)) |
| |
| /* |
| * Encode and decode a swap entry (must be !pte_none(pte) && !pte_present(pte): |
| * |
| * 31 30 29 28 27 26 25 24 23 22 21 20 19 18 ... 1 0 |
| * 0 0 0 0 type. 0 0 0 0 0 0 offset......... |
| * |
| * This gives us up to 2**2 = 4 swap files and 2**20 * 4K = 4G per swap file. |
| * |
| * Note that the offset field is always non-zero, thus !pte_none(pte) is always |
| * true. |
| */ |
| #define __swp_type(swp) (((swp).val >> 26) & 0x3) |
| #define __swp_offset(swp) ((swp).val & 0xfffff) |
| #define __swp_entry(type, off) ((swp_entry_t) { (((type) & 0x3) << 26) \ |
| | ((off) & 0xfffff) }) |
| #define __swp_entry_to_pte(swp) ((pte_t) { (swp).val }) |
| #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) }) |
| |
| #define kern_addr_valid(addr) (1) |
| |
| extern void __init paging_init(void); |
| extern void __init mmu_init(void); |
| |
| extern void update_mmu_cache(struct vm_area_struct *vma, |
| unsigned long address, pte_t *pte); |
| |
| #endif /* _ASM_NIOS2_PGTABLE_H */ |