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Diffstat (limited to 'arch/nios2/include/asm/pgtable.h')
| -rw-r--r-- | arch/nios2/include/asm/pgtable.h | 310 |
1 files changed, 310 insertions, 0 deletions
diff --git a/arch/nios2/include/asm/pgtable.h b/arch/nios2/include/asm/pgtable.h new file mode 100644 index 000000000000..ccbaffd47671 --- /dev/null +++ b/arch/nios2/include/asm/pgtable.h @@ -0,0 +1,310 @@ +/* + * 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 FIRST_USER_ADDRESS 0 + +#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->pud.pgd.pgd = pmdval.pud.pgd.pgd; +} + +/* to find an entry in a page-table-directory */ +#define pgd_index(addr) (((addr) >> PGDIR_SHIFT) & (PTRS_PER_PGD - 1)) +#define pgd_offset(mm, addr) ((mm)->pgd + pgd_index(addr)) + +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; } +static inline int pte_file(pte_t pte) \ + { return pte_val(pte) & _PAGE_FILE; } +static inline int pte_special(pte_t pte) { return 0; } + +#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_mkspecial(pte_t pte) { 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 = 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); + flush_tlb_one(addr); +} + +/* + * 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)) + +#define pte_unmap(pte) do { } while (0) + +/* + * 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_page(pmd) (pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT)) +#define pmd_page_vaddr(pmd) pmd_val(pmd) + +#define pte_offset_map(dir, addr) \ + ((pte_t *) page_address(pmd_page(*dir)) + \ + (((addr) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1))) + +/* to find an entry in a kernel page-table-directory */ +#define pgd_offset_k(addr) pgd_offset(&init_mm, addr) + +/* Get the address to the PTE for a vaddr in specific directory */ +#define pte_offset_kernel(dir, addr) \ + ((pte_t *) pmd_page_vaddr(*(dir)) + \ + (((addr) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1))) + +#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) + * && !pte_file(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) }) + +/* Encode and decode a nonlinear file mapping entry */ +#define PTE_FILE_MAX_BITS 25 +#define pte_to_pgoff(pte) (pte_val(pte) & 0x1ffffff) +#define pgoff_to_pte(off) __pte(((off) & 0x1ffffff) | _PAGE_FILE) + +#define kern_addr_valid(addr) (1) + +#include <asm-generic/pgtable.h> + +#define pgtable_cache_init() do { } while (0) + +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 */ |