/* * 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. * * Copyright (C) 2003 Ralf Baechle */ #ifndef _ASM_PGTABLE_H #define _ASM_PGTABLE_H #include #include #include struct mm_struct; struct vm_area_struct; #define PAGE_NONE __pgprot(_PAGE_PRESENT | _CACHE_CACHABLE_NONCOHERENT) #define PAGE_SHARED __pgprot(_PAGE_PRESENT | _PAGE_READ | _PAGE_WRITE | \ _page_cachable_default) #define PAGE_COPY __pgprot(_PAGE_PRESENT | _PAGE_READ | \ _page_cachable_default) #define PAGE_READONLY __pgprot(_PAGE_PRESENT | _PAGE_READ | \ _page_cachable_default) #define PAGE_KERNEL __pgprot(_PAGE_PRESENT | __READABLE | __WRITEABLE | \ _PAGE_GLOBAL | _page_cachable_default) #define PAGE_USERIO __pgprot(_PAGE_PRESENT | _PAGE_READ | _PAGE_WRITE | \ _page_cachable_default) #define PAGE_KERNEL_UNCACHED __pgprot(_PAGE_PRESENT | __READABLE | \ __WRITEABLE | _PAGE_GLOBAL | _CACHE_UNCACHED) /* * MIPS can't do page protection for execute, and considers that the same like * read. Also, write permissions imply read permissions. This is the closest * we can get by reasonable means.. */ /* * Dummy values to fill the table in mmap.c * The real values will be generated at runtime */ #define __P000 __pgprot(0) #define __P001 __pgprot(0) #define __P010 __pgprot(0) #define __P011 __pgprot(0) #define __P100 __pgprot(0) #define __P101 __pgprot(0) #define __P110 __pgprot(0) #define __P111 __pgprot(0) #define __S000 __pgprot(0) #define __S001 __pgprot(0) #define __S010 __pgprot(0) #define __S011 __pgprot(0) #define __S100 __pgprot(0) #define __S101 __pgprot(0) #define __S110 __pgprot(0) #define __S111 __pgprot(0) extern unsigned long _page_cachable_default; /* * ZERO_PAGE is a global shared page that is always zero; used * for zero-mapped memory areas etc.. */ extern unsigned long empty_zero_page; extern unsigned long zero_page_mask; #define ZERO_PAGE(vaddr) \ (virt_to_page((void *)(empty_zero_page + (((unsigned long)(vaddr)) & zero_page_mask)))) extern void paging_init(void); /* * 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_none(pte) (!(pte_val(pte) & ~_PAGE_GLOBAL)) #define pte_present(pte) (pte_val(pte) & _PAGE_PRESENT) /* * Certain architectures need to do special things when pte's * within a page table are directly modified. Thus, the following * hook is made available. */ static inline void set_pte(pte_t *ptep, pte_t pteval) { *ptep = pteval; } #define set_pte_at(mm, addr, ptep, pteval) set_pte(ptep, pteval) static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep) { set_pte_at(mm, addr, ptep, __pte(0)); } /* * (pmds are folded into puds so this doesn't get actually called, * but the define is needed for a generic inline function.) */ #define set_pmd(pmdptr, pmdval) do { *(pmdptr) = (pmdval); } while(0) #define PGD_T_LOG2 (__builtin_ffs(sizeof(pgd_t)) - 1) #define PMD_T_LOG2 (__builtin_ffs(sizeof(pmd_t)) - 1) #define PTE_T_LOG2 (__builtin_ffs(sizeof(pte_t)) - 1) /* * We used to declare this array with size but gcc 3.3 and older are not able * to find that this expression is a constant, so the size is dropped. */ extern pgd_t swapper_pg_dir[]; /* * The following only work if pte_present() is true. * Undefined behaviour if not.. */ 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_MODIFIED; } 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 pte_t pte_wrprotect(pte_t pte) { pte_val(pte) &= ~(_PAGE_WRITE | _PAGE_SILENT_WRITE); return pte; } static inline pte_t pte_mkclean(pte_t pte) { pte_val(pte) &= ~(_PAGE_MODIFIED|_PAGE_SILENT_WRITE); return pte; } static inline pte_t pte_mkold(pte_t pte) { pte_val(pte) &= ~(_PAGE_ACCESSED|_PAGE_SILENT_READ); return pte; } static inline pte_t pte_mkwrite(pte_t pte) { pte_val(pte) |= _PAGE_WRITE; if (pte_val(pte) & _PAGE_MODIFIED) pte_val(pte) |= _PAGE_SILENT_WRITE; return pte; } static inline pte_t pte_mkdirty(pte_t pte) { pte_val(pte) |= _PAGE_MODIFIED; if (pte_val(pte) & _PAGE_WRITE) pte_val(pte) |= _PAGE_SILENT_WRITE; return pte; } static inline pte_t pte_mkyoung(pte_t pte) { pte_val(pte) |= _PAGE_ACCESSED; if (pte_val(pte) & _PAGE_READ) pte_val(pte) |= _PAGE_SILENT_READ; return pte; } static inline int pte_special(pte_t pte) { return 0; } static inline pte_t pte_mkspecial(pte_t pte) { return pte; } /* * Macro to make mark a page protection value as "uncacheable". Note * that "protection" is really a misnomer here as the protection value * contains the memory attribute bits, dirty bits, and various other * bits as well. */ #define pgprot_noncached pgprot_noncached static inline pgprot_t pgprot_noncached(pgprot_t _prot) { unsigned long prot = pgprot_val(_prot); prot = (prot & ~_CACHE_MASK) | _CACHE_UNCACHED; return __pgprot(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 mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot)) static inline pte_t pte_modify(pte_t pte, pgprot_t newprot) { return __pte((pte_val(pte) & _PAGE_CHG_MASK) | pgprot_val(newprot)); } extern void __update_tlb(struct vm_area_struct *vma, unsigned long address, pte_t pte); extern void __update_cache(struct vm_area_struct *vma, unsigned long address, pte_t pte); static inline void update_mmu_cache(struct vm_area_struct *vma, unsigned long address, pte_t pte) { __update_tlb(vma, address, pte); __update_cache(vma, address, pte); } #define kern_addr_valid(addr) (1) #define io_remap_pfn_range(vma, vaddr, pfn, size, prot) \ remap_pfn_range(vma, vaddr, pfn, size, prot) #include /* * We provide our own get_unmapped area to cope with the virtual aliasing * constraints placed on us by the cache architecture. */ #define HAVE_ARCH_UNMAPPED_AREA /* * No page table caches to initialise */ #define pgtable_cache_init() do { } while (0) #endif /* _ASM_PGTABLE_H */