/* * 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 #ifdef CONFIG_32BIT #include #endif #ifdef CONFIG_64BIT #include #endif #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_WRITE | (cpu_has_rixi ? 0 : _PAGE_READ) | \ _page_cachable_default) #define PAGE_COPY __pgprot(_PAGE_PRESENT | (cpu_has_rixi ? 0 : _PAGE_READ) | \ (cpu_has_rixi ? _PAGE_NO_EXEC : 0) | _page_cachable_default) #define PAGE_READONLY __pgprot(_PAGE_PRESENT | (cpu_has_rixi ? 0 : _PAGE_READ) | \ _page_cachable_default) #define PAGE_KERNEL __pgprot(_PAGE_PRESENT | __READABLE | __WRITEABLE | \ _PAGE_GLOBAL | _page_cachable_default) #define PAGE_USERIO __pgprot(_PAGE_PRESENT | (cpu_has_rixi ? 0 : _PAGE_READ) | _PAGE_WRITE | \ _page_cachable_default) #define PAGE_KERNEL_UNCACHED __pgprot(_PAGE_PRESENT | __READABLE | \ __WRITEABLE | _PAGE_GLOBAL | _CACHE_UNCACHED) /* * If _PAGE_NO_EXEC is not defined, we can't do page protection for * execute, and consider it to be the same as 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)))) #define __HAVE_COLOR_ZERO_PAGE 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)) #ifndef CONFIG_TRANSPARENT_HUGEPAGE #define pmd_page(pmd) __pmd_page(pmd) #endif /* CONFIG_TRANSPARENT_HUGEPAGE */ #define pmd_page_vaddr(pmd) pmd_val(pmd) #if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32) #define pte_none(pte) (!(((pte).pte_low | (pte).pte_high) & ~_PAGE_GLOBAL)) #define pte_present(pte) ((pte).pte_low & _PAGE_PRESENT) static inline void set_pte(pte_t *ptep, pte_t pte) { ptep->pte_high = pte.pte_high; smp_wmb(); ptep->pte_low = pte.pte_low; if (pte.pte_low & _PAGE_GLOBAL) { pte_t *buddy = ptep_buddy(ptep); /* * Make sure the buddy is global too (if it's !none, * it better already be global) */ if (pte_none(*buddy)) { buddy->pte_low |= _PAGE_GLOBAL; buddy->pte_high |= _PAGE_GLOBAL; } } } #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) { pte_t null = __pte(0); /* Preserve global status for the pair */ if (ptep_buddy(ptep)->pte_low & _PAGE_GLOBAL) null.pte_low = null.pte_high = _PAGE_GLOBAL; set_pte_at(mm, addr, ptep, null); } #else #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; #if !defined(CONFIG_CPU_R3000) && !defined(CONFIG_CPU_TX39XX) if (pte_val(pteval) & _PAGE_GLOBAL) { pte_t *buddy = ptep_buddy(ptep); /* * Make sure the buddy is global too (if it's !none, * it better already be global) */ #ifdef CONFIG_SMP /* * For SMP, multiple CPUs can race, so we need to do * this atomically. */ #ifdef CONFIG_64BIT #define LL_INSN "lld" #define SC_INSN "scd" #else /* CONFIG_32BIT */ #define LL_INSN "ll" #define SC_INSN "sc" #endif unsigned long page_global = _PAGE_GLOBAL; unsigned long tmp; __asm__ __volatile__ ( " .set push\n" " .set noreorder\n" "1: " LL_INSN " %[tmp], %[buddy]\n" " bnez %[tmp], 2f\n" " or %[tmp], %[tmp], %[global]\n" " " SC_INSN " %[tmp], %[buddy]\n" " beqz %[tmp], 1b\n" " nop\n" "2:\n" " .set pop" : [buddy] "+m" (buddy->pte), [tmp] "=&r" (tmp) : [global] "r" (page_global)); #else /* !CONFIG_SMP */ if (pte_none(*buddy)) pte_val(*buddy) = pte_val(*buddy) | _PAGE_GLOBAL; #endif /* CONFIG_SMP */ } #endif } #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) { #if !defined(CONFIG_CPU_R3000) && !defined(CONFIG_CPU_TX39XX) /* Preserve global status for the pair */ if (pte_val(*ptep_buddy(ptep)) & _PAGE_GLOBAL) set_pte_at(mm, addr, ptep, __pte(_PAGE_GLOBAL)); else #endif set_pte_at(mm, addr, ptep, __pte(0)); } #endif /* * (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) #ifndef __PAGETABLE_PMD_FOLDED /* * (puds are folded into pgds so this doesn't get actually called, * but the define is needed for a generic inline function.) */ #define set_pud(pudptr, pudval) do { *(pudptr) = (pudval); } while(0) #endif #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.. */ #if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32) static inline int pte_write(pte_t pte) { return pte.pte_low & _PAGE_WRITE; } static inline int pte_dirty(pte_t pte) { return pte.pte_low & _PAGE_MODIFIED; } static inline int pte_young(pte_t pte) { return pte.pte_low & _PAGE_ACCESSED; } static inline int pte_file(pte_t pte) { return pte.pte_low & _PAGE_FILE; } static inline pte_t pte_wrprotect(pte_t pte) { pte.pte_low &= ~(_PAGE_WRITE | _PAGE_SILENT_WRITE); pte.pte_high &= ~_PAGE_SILENT_WRITE; return pte; } static inline pte_t pte_mkclean(pte_t pte) { pte.pte_low &= ~(_PAGE_MODIFIED | _PAGE_SILENT_WRITE); pte.pte_high &= ~_PAGE_SILENT_WRITE; return pte; } static inline pte_t pte_mkold(pte_t pte) { pte.pte_low &= ~(_PAGE_ACCESSED | _PAGE_SILENT_READ); pte.pte_high &= ~_PAGE_SILENT_READ; return pte; } static inline pte_t pte_mkwrite(pte_t pte) { pte.pte_low |= _PAGE_WRITE; if (pte.pte_low & _PAGE_MODIFIED) { pte.pte_low |= _PAGE_SILENT_WRITE; pte.pte_high |= _PAGE_SILENT_WRITE; } return pte; } static inline pte_t pte_mkdirty(pte_t pte) { pte.pte_low |= _PAGE_MODIFIED; if (pte.pte_low & _PAGE_WRITE) { pte.pte_low |= _PAGE_SILENT_WRITE; pte.pte_high |= _PAGE_SILENT_WRITE; } return pte; } static inline pte_t pte_mkyoung(pte_t pte) { pte.pte_low |= _PAGE_ACCESSED; if (pte.pte_low & _PAGE_READ) { pte.pte_low |= _PAGE_SILENT_READ; pte.pte_high |= _PAGE_SILENT_READ; } return pte; } #else 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 (cpu_has_rixi) { if (!(pte_val(pte) & _PAGE_NO_READ)) pte_val(pte) |= _PAGE_SILENT_READ; } else { if (pte_val(pte) & _PAGE_READ) pte_val(pte) |= _PAGE_SILENT_READ; } return pte; } #ifdef _PAGE_HUGE static inline int pte_huge(pte_t pte) { return pte_val(pte) & _PAGE_HUGE; } static inline pte_t pte_mkhuge(pte_t pte) { pte_val(pte) |= _PAGE_HUGE; return pte; } #endif /* _PAGE_HUGE */ #endif 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)) #if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32) static inline pte_t pte_modify(pte_t pte, pgprot_t newprot) { pte.pte_low &= _PAGE_CHG_MASK; pte.pte_high &= ~0x3f; pte.pte_low |= pgprot_val(newprot); pte.pte_high |= pgprot_val(newprot) & 0x3f; return pte; } #else static inline pte_t pte_modify(pte_t pte, pgprot_t newprot) { return __pte((pte_val(pte) & _PAGE_CHG_MASK) | pgprot_val(newprot)); } #endif 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 *ptep) { pte_t pte = *ptep; __update_tlb(vma, address, pte); __update_cache(vma, address, pte); } static inline void update_mmu_cache_pmd(struct vm_area_struct *vma, unsigned long address, pmd_t *pmdp) { pte_t pte = *(pte_t *)pmdp; __update_tlb(vma, address, pte); } #define kern_addr_valid(addr) (1) #ifdef CONFIG_64BIT_PHYS_ADDR extern int remap_pfn_range(struct vm_area_struct *vma, unsigned long from, unsigned long pfn, unsigned long size, pgprot_t prot); static inline int io_remap_pfn_range(struct vm_area_struct *vma, unsigned long vaddr, unsigned long pfn, unsigned long size, pgprot_t prot) { phys_t phys_addr_high = fixup_bigphys_addr(pfn << PAGE_SHIFT, size); return remap_pfn_range(vma, vaddr, phys_addr_high >> PAGE_SHIFT, size, prot); } #else #define io_remap_pfn_range(vma, vaddr, pfn, size, prot) \ remap_pfn_range(vma, vaddr, pfn, size, prot) #endif #ifdef CONFIG_TRANSPARENT_HUGEPAGE extern int has_transparent_hugepage(void); static inline int pmd_trans_huge(pmd_t pmd) { return !!(pmd_val(pmd) & _PAGE_HUGE); } static inline pmd_t pmd_mkhuge(pmd_t pmd) { pmd_val(pmd) |= _PAGE_HUGE; return pmd; } static inline int pmd_trans_splitting(pmd_t pmd) { return !!(pmd_val(pmd) & _PAGE_SPLITTING); } static inline pmd_t pmd_mksplitting(pmd_t pmd) { pmd_val(pmd) |= _PAGE_SPLITTING; return pmd; } extern void set_pmd_at(struct mm_struct *mm, unsigned long addr, pmd_t *pmdp, pmd_t pmd); #define __HAVE_ARCH_PMDP_SPLITTING_FLUSH /* Extern to avoid header file madness */ extern void pmdp_splitting_flush(struct vm_area_struct *vma, unsigned long address, pmd_t *pmdp); #define __HAVE_ARCH_PMD_WRITE static inline int pmd_write(pmd_t pmd) { return !!(pmd_val(pmd) & _PAGE_WRITE); } static inline pmd_t pmd_wrprotect(pmd_t pmd) { pmd_val(pmd) &= ~(_PAGE_WRITE | _PAGE_SILENT_WRITE); return pmd; } static inline pmd_t pmd_mkwrite(pmd_t pmd) { pmd_val(pmd) |= _PAGE_WRITE; if (pmd_val(pmd) & _PAGE_MODIFIED) pmd_val(pmd) |= _PAGE_SILENT_WRITE; return pmd; } static inline int pmd_dirty(pmd_t pmd) { return !!(pmd_val(pmd) & _PAGE_MODIFIED); } static inline pmd_t pmd_mkclean(pmd_t pmd) { pmd_val(pmd) &= ~(_PAGE_MODIFIED | _PAGE_SILENT_WRITE); return pmd; } static inline pmd_t pmd_mkdirty(pmd_t pmd) { pmd_val(pmd) |= _PAGE_MODIFIED; if (pmd_val(pmd) & _PAGE_WRITE) pmd_val(pmd) |= _PAGE_SILENT_WRITE; return pmd; } static inline int pmd_young(pmd_t pmd) { return !!(pmd_val(pmd) & _PAGE_ACCESSED); } static inline pmd_t pmd_mkold(pmd_t pmd) { pmd_val(pmd) &= ~(_PAGE_ACCESSED|_PAGE_SILENT_READ); return pmd; } static inline pmd_t pmd_mkyoung(pmd_t pmd) { pmd_val(pmd) |= _PAGE_ACCESSED; if (cpu_has_rixi) { if (!(pmd_val(pmd) & _PAGE_NO_READ)) pmd_val(pmd) |= _PAGE_SILENT_READ; } else { if (pmd_val(pmd) & _PAGE_READ) pmd_val(pmd) |= _PAGE_SILENT_READ; } return pmd; } /* Extern to avoid header file madness */ extern pmd_t mk_pmd(struct page *page, pgprot_t prot); static inline unsigned long pmd_pfn(pmd_t pmd) { return pmd_val(pmd) >> _PFN_SHIFT; } static inline struct page *pmd_page(pmd_t pmd) { if (pmd_trans_huge(pmd)) return pfn_to_page(pmd_pfn(pmd)); return pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT); } static inline pmd_t pmd_modify(pmd_t pmd, pgprot_t newprot) { pmd_val(pmd) = (pmd_val(pmd) & _PAGE_CHG_MASK) | pgprot_val(newprot); return pmd; } static inline pmd_t pmd_mknotpresent(pmd_t pmd) { pmd_val(pmd) &= ~(_PAGE_PRESENT | _PAGE_VALID | _PAGE_DIRTY); return pmd; } /* * The generic version pmdp_get_and_clear uses a version of pmd_clear() with a * different prototype. */ #define __HAVE_ARCH_PMDP_GET_AND_CLEAR static inline pmd_t pmdp_get_and_clear(struct mm_struct *mm, unsigned long address, pmd_t *pmdp) { pmd_t old = *pmdp; pmd_clear(pmdp); return old; } #endif /* CONFIG_TRANSPARENT_HUGEPAGE */ #include /* * uncached accelerated TLB map for video memory access */ #ifdef CONFIG_CPU_SUPPORTS_UNCACHED_ACCELERATED #define __HAVE_PHYS_MEM_ACCESS_PROT struct file; pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn, unsigned long size, pgprot_t vma_prot); int phys_mem_access_prot_allowed(struct file *file, unsigned long pfn, unsigned long size, pgprot_t *vma_prot); #endif /* * 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 #define HAVE_ARCH_UNMAPPED_AREA_TOPDOWN /* * No page table caches to initialise */ #define pgtable_cache_init() do { } while (0) #endif /* _ASM_PGTABLE_H */