#ifndef _SPARC_PGTABLE_H #define _SPARC_PGTABLE_H /* asm/pgtable.h: Defines and functions used to work * with Sparc page tables. * * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu) * Copyright (C) 1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz) */ #include #ifndef __ASSEMBLY__ #include #include #include #include #include #include #include #include struct vm_area_struct; struct page; extern void load_mmu(void); extern unsigned long calc_highpages(void); #define pte_ERROR(e) __builtin_trap() #define pmd_ERROR(e) __builtin_trap() #define pgd_ERROR(e) __builtin_trap() #define PMD_SHIFT 22 #define PMD_SIZE (1UL << PMD_SHIFT) #define PMD_MASK (~(PMD_SIZE-1)) #define PMD_ALIGN(__addr) (((__addr) + ~PMD_MASK) & PMD_MASK) #define PGDIR_SHIFT SRMMU_PGDIR_SHIFT #define PGDIR_SIZE SRMMU_PGDIR_SIZE #define PGDIR_MASK SRMMU_PGDIR_MASK #define PTRS_PER_PTE 1024 #define PTRS_PER_PMD SRMMU_PTRS_PER_PMD #define PTRS_PER_PGD SRMMU_PTRS_PER_PGD #define USER_PTRS_PER_PGD PAGE_OFFSET / SRMMU_PGDIR_SIZE #define FIRST_USER_ADDRESS 0 #define PTE_SIZE (PTRS_PER_PTE*4) #define PAGE_NONE SRMMU_PAGE_NONE #define PAGE_SHARED SRMMU_PAGE_SHARED #define PAGE_COPY SRMMU_PAGE_COPY #define PAGE_READONLY SRMMU_PAGE_RDONLY #define PAGE_KERNEL SRMMU_PAGE_KERNEL /* Top-level page directory */ extern pgd_t swapper_pg_dir[1024]; extern void paging_init(void); extern unsigned long ptr_in_current_pgd; /* xwr */ #define __P000 PAGE_NONE #define __P001 PAGE_READONLY #define __P010 PAGE_COPY #define __P011 PAGE_COPY #define __P100 PAGE_READONLY #define __P101 PAGE_READONLY #define __P110 PAGE_COPY #define __P111 PAGE_COPY #define __S000 PAGE_NONE #define __S001 PAGE_READONLY #define __S010 PAGE_SHARED #define __S011 PAGE_SHARED #define __S100 PAGE_READONLY #define __S101 PAGE_READONLY #define __S110 PAGE_SHARED #define __S111 PAGE_SHARED extern int num_contexts; /* First physical page can be anywhere, the following is needed so that * va-->pa and vice versa conversions work properly without performance * hit for all __pa()/__va() operations. */ extern unsigned long phys_base; extern unsigned long pfn_base; /* * BAD_PAGETABLE is used when we need a bogus page-table, while * BAD_PAGE is used for a bogus page. * * ZERO_PAGE is a global shared page that is always zero: used * for zero-mapped memory areas etc.. */ extern pte_t * __bad_pagetable(void); extern pte_t __bad_page(void); extern unsigned long empty_zero_page; #define BAD_PAGETABLE __bad_pagetable() #define BAD_PAGE __bad_page() #define ZERO_PAGE(vaddr) (virt_to_page(&empty_zero_page)) /* * In general all page table modifications should use the V8 atomic * swap instruction. This insures the mmu and the cpu are in sync * with respect to ref/mod bits in the page tables. */ static inline unsigned long srmmu_swap(unsigned long *addr, unsigned long value) { __asm__ __volatile__("swap [%2], %0" : "=&r" (value) : "0" (value), "r" (addr)); return value; } static inline void srmmu_set_pte(pte_t *ptep, pte_t pteval) { srmmu_swap((unsigned long *)ptep, pte_val(pteval)); } static inline int srmmu_device_memory(unsigned long x) { return ((x & 0xF0000000) != 0); } static inline struct page *pmd_page(pmd_t pmd) { if (srmmu_device_memory(pmd_val(pmd))) BUG(); return pfn_to_page((pmd_val(pmd) & SRMMU_PTD_PMASK) >> (PAGE_SHIFT-4)); } BTFIXUPDEF_CALL_CONST(unsigned long, pgd_page_vaddr, pgd_t) #define pgd_page_vaddr(pgd) BTFIXUP_CALL(pgd_page_vaddr)(pgd) BTFIXUPDEF_CALL_CONST(int, pte_present, pte_t) static inline int pte_none(pte_t pte) { return !pte_val(pte); } #define pte_present(pte) BTFIXUP_CALL(pte_present)(pte) static inline void __pte_clear(pte_t *ptep) { srmmu_set_pte(ptep, __pte(0)); } static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep) { __pte_clear(ptep); } BTFIXUPDEF_CALL_CONST(int, pmd_bad, pmd_t) BTFIXUPDEF_CALL_CONST(int, pmd_present, pmd_t) static inline int pmd_none(pmd_t pmd) { return !pmd_val(pmd); } #define pmd_bad(pmd) BTFIXUP_CALL(pmd_bad)(pmd) #define pmd_present(pmd) BTFIXUP_CALL(pmd_present)(pmd) static inline void pmd_clear(pmd_t *pmdp) { int i; for (i = 0; i < PTRS_PER_PTE/SRMMU_REAL_PTRS_PER_PTE; i++) srmmu_set_pte((pte_t *)&pmdp->pmdv[i], __pte(0)); } static inline int pgd_none(pgd_t pgd) { return !(pgd_val(pgd) & 0xFFFFFFF); } static inline int pgd_bad(pgd_t pgd) { return (pgd_val(pgd) & SRMMU_ET_MASK) != SRMMU_ET_PTD; } static inline int pgd_present(pgd_t pgd) { return ((pgd_val(pgd) & SRMMU_ET_MASK) == SRMMU_ET_PTD); } static inline void pgd_clear(pgd_t *pgdp) { srmmu_set_pte((pte_t *)pgdp, __pte(0)); } /* * The following only work if pte_present() is true. * Undefined behaviour if not.. */ BTFIXUPDEF_HALF(pte_writei) BTFIXUPDEF_HALF(pte_dirtyi) BTFIXUPDEF_HALF(pte_youngi) static int pte_write(pte_t pte) __attribute_const__; static inline int pte_write(pte_t pte) { return pte_val(pte) & BTFIXUP_HALF(pte_writei); } static int pte_dirty(pte_t pte) __attribute_const__; static inline int pte_dirty(pte_t pte) { return pte_val(pte) & BTFIXUP_HALF(pte_dirtyi); } static int pte_young(pte_t pte) __attribute_const__; static inline int pte_young(pte_t pte) { return pte_val(pte) & BTFIXUP_HALF(pte_youngi); } /* * The following only work if pte_present() is not true. */ BTFIXUPDEF_HALF(pte_filei) static int pte_file(pte_t pte) __attribute_const__; static inline int pte_file(pte_t pte) { return pte_val(pte) & BTFIXUP_HALF(pte_filei); } static inline int pte_special(pte_t pte) { return 0; } /* */ BTFIXUPDEF_HALF(pte_wrprotecti) BTFIXUPDEF_HALF(pte_mkcleani) BTFIXUPDEF_HALF(pte_mkoldi) static pte_t pte_wrprotect(pte_t pte) __attribute_const__; static inline pte_t pte_wrprotect(pte_t pte) { return __pte(pte_val(pte) & ~BTFIXUP_HALF(pte_wrprotecti)); } static pte_t pte_mkclean(pte_t pte) __attribute_const__; static inline pte_t pte_mkclean(pte_t pte) { return __pte(pte_val(pte) & ~BTFIXUP_HALF(pte_mkcleani)); } static pte_t pte_mkold(pte_t pte) __attribute_const__; static inline pte_t pte_mkold(pte_t pte) { return __pte(pte_val(pte) & ~BTFIXUP_HALF(pte_mkoldi)); } BTFIXUPDEF_CALL_CONST(pte_t, pte_mkwrite, pte_t) BTFIXUPDEF_CALL_CONST(pte_t, pte_mkdirty, pte_t) BTFIXUPDEF_CALL_CONST(pte_t, pte_mkyoung, pte_t) #define pte_mkwrite(pte) BTFIXUP_CALL(pte_mkwrite)(pte) #define pte_mkdirty(pte) BTFIXUP_CALL(pte_mkdirty)(pte) #define pte_mkyoung(pte) BTFIXUP_CALL(pte_mkyoung)(pte) #define pte_mkspecial(pte) (pte) #define pfn_pte(pfn, prot) mk_pte(pfn_to_page(pfn), prot) static inline unsigned long pte_pfn(pte_t pte) { if (srmmu_device_memory(pte_val(pte))) { /* Just return something that will cause * pfn_valid() to return false. This makes * copy_one_pte() to just directly copy to * PTE over. */ return ~0UL; } return (pte_val(pte) & SRMMU_PTE_PMASK) >> (PAGE_SHIFT-4); } #define pte_page(pte) pfn_to_page(pte_pfn(pte)) /* * Conversion functions: convert a page and protection to a page entry, * and a page entry and page directory to the page they refer to. */ BTFIXUPDEF_CALL_CONST(pte_t, mk_pte, struct page *, pgprot_t) BTFIXUPDEF_CALL_CONST(pte_t, mk_pte_phys, unsigned long, pgprot_t) BTFIXUPDEF_CALL_CONST(pte_t, mk_pte_io, unsigned long, pgprot_t, int) #define mk_pte(page,pgprot) BTFIXUP_CALL(mk_pte)(page,pgprot) #define mk_pte_phys(page,pgprot) BTFIXUP_CALL(mk_pte_phys)(page,pgprot) #define mk_pte_io(page,pgprot,space) BTFIXUP_CALL(mk_pte_io)(page,pgprot,space) #define pgprot_noncached pgprot_noncached static inline pgprot_t pgprot_noncached(pgprot_t prot) { prot &= ~__pgprot(SRMMU_CACHE); return prot; } BTFIXUPDEF_INT(pte_modify_mask) static pte_t pte_modify(pte_t pte, pgprot_t newprot) __attribute_const__; static inline pte_t pte_modify(pte_t pte, pgprot_t newprot) { return __pte((pte_val(pte) & BTFIXUP_INT(pte_modify_mask)) | pgprot_val(newprot)); } #define pgd_index(address) ((address) >> PGDIR_SHIFT) /* to find an entry in a page-table-directory */ #define pgd_offset(mm, address) ((mm)->pgd + pgd_index(address)) /* to find an entry in a kernel page-table-directory */ #define pgd_offset_k(address) pgd_offset(&init_mm, address) /* Find an entry in the second-level page table.. */ BTFIXUPDEF_CALL(pmd_t *, pmd_offset, pgd_t *, unsigned long) #define pmd_offset(dir,addr) BTFIXUP_CALL(pmd_offset)(dir,addr) /* Find an entry in the third-level page table.. */ BTFIXUPDEF_CALL(pte_t *, pte_offset_kernel, pmd_t *, unsigned long) #define pte_offset_kernel(dir,addr) BTFIXUP_CALL(pte_offset_kernel)(dir,addr) /* * This shortcut works on sun4m (and sun4d) because the nocache area is static. */ #define pte_offset_map(d, a) pte_offset_kernel(d,a) #define pte_unmap(pte) do{}while(0) /* Certain architectures need to do special things when pte's * within a page table are directly modified. Thus, the following * hook is made available. */ BTFIXUPDEF_CALL(void, set_pte, pte_t *, pte_t) #define set_pte(ptep,pteval) BTFIXUP_CALL(set_pte)(ptep,pteval) #define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval) struct seq_file; BTFIXUPDEF_CALL(void, mmu_info, struct seq_file *) #define mmu_info(p) BTFIXUP_CALL(mmu_info)(p) /* Fault handler stuff... */ #define FAULT_CODE_PROT 0x1 #define FAULT_CODE_WRITE 0x2 #define FAULT_CODE_USER 0x4 BTFIXUPDEF_CALL(void, update_mmu_cache, struct vm_area_struct *, unsigned long, pte_t *) #define update_mmu_cache(vma,addr,ptep) BTFIXUP_CALL(update_mmu_cache)(vma,addr,ptep) BTFIXUPDEF_CALL(void, sparc_mapiorange, unsigned int, unsigned long, unsigned long, unsigned int) BTFIXUPDEF_CALL(void, sparc_unmapiorange, unsigned long, unsigned int) #define sparc_mapiorange(bus,pa,va,len) BTFIXUP_CALL(sparc_mapiorange)(bus,pa,va,len) #define sparc_unmapiorange(va,len) BTFIXUP_CALL(sparc_unmapiorange)(va,len) extern int invalid_segment; /* Encode and de-code a swap entry */ BTFIXUPDEF_CALL(unsigned long, __swp_type, swp_entry_t) BTFIXUPDEF_CALL(unsigned long, __swp_offset, swp_entry_t) BTFIXUPDEF_CALL(swp_entry_t, __swp_entry, unsigned long, unsigned long) #define __swp_type(__x) BTFIXUP_CALL(__swp_type)(__x) #define __swp_offset(__x) BTFIXUP_CALL(__swp_offset)(__x) #define __swp_entry(__type,__off) BTFIXUP_CALL(__swp_entry)(__type,__off) #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) }) #define __swp_entry_to_pte(x) ((pte_t) { (x).val }) /* file-offset-in-pte helpers */ static inline unsigned long pte_to_pgoff(pte_t pte) { return pte_val(pte) >> SRMMU_PTE_FILE_SHIFT; } static inline pte_t pgoff_to_pte(unsigned long pgoff) { return __pte((pgoff << SRMMU_PTE_FILE_SHIFT) | SRMMU_FILE); } /* * This is made a constant because mm/fremap.c required a constant. */ #define PTE_FILE_MAX_BITS 24 /* */ struct ctx_list { struct ctx_list *next; struct ctx_list *prev; unsigned int ctx_number; struct mm_struct *ctx_mm; }; extern struct ctx_list *ctx_list_pool; /* Dynamically allocated */ extern struct ctx_list ctx_free; /* Head of free list */ extern struct ctx_list ctx_used; /* Head of used contexts list */ #define NO_CONTEXT -1 static inline void remove_from_ctx_list(struct ctx_list *entry) { entry->next->prev = entry->prev; entry->prev->next = entry->next; } static inline void add_to_ctx_list(struct ctx_list *head, struct ctx_list *entry) { entry->next = head; (entry->prev = head->prev)->next = entry; head->prev = entry; } #define add_to_free_ctxlist(entry) add_to_ctx_list(&ctx_free, entry) #define add_to_used_ctxlist(entry) add_to_ctx_list(&ctx_used, entry) static inline unsigned long __get_phys (unsigned long addr) { switch (sparc_cpu_model){ case sun4m: case sun4d: return ((srmmu_get_pte (addr) & 0xffffff00) << 4); default: return 0; } } static inline int __get_iospace (unsigned long addr) { switch (sparc_cpu_model){ case sun4m: case sun4d: return (srmmu_get_pte (addr) >> 28); default: return -1; } } extern unsigned long *sparc_valid_addr_bitmap; /* Needs to be defined here and not in linux/mm.h, as it is arch dependent */ #define kern_addr_valid(addr) \ (test_bit(__pa((unsigned long)(addr))>>20, sparc_valid_addr_bitmap)) /* * For sparc32&64, the pfn in io_remap_pfn_range() carries in * its high 4 bits. These macros/functions put it there or get it from there. */ #define MK_IOSPACE_PFN(space, pfn) (pfn | (space << (BITS_PER_LONG - 4))) #define GET_IOSPACE(pfn) (pfn >> (BITS_PER_LONG - 4)) #define GET_PFN(pfn) (pfn & 0x0fffffffUL) extern int remap_pfn_range(struct vm_area_struct *, unsigned long, unsigned long, unsigned long, pgprot_t); static inline int io_remap_pfn_range(struct vm_area_struct *vma, unsigned long from, unsigned long pfn, unsigned long size, pgprot_t prot) { unsigned long long offset, space, phys_base; offset = ((unsigned long long) GET_PFN(pfn)) << PAGE_SHIFT; space = GET_IOSPACE(pfn); phys_base = offset | (space << 32ULL); return remap_pfn_range(vma, from, phys_base >> PAGE_SHIFT, size, prot); } #define __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS #define ptep_set_access_flags(__vma, __address, __ptep, __entry, __dirty) \ ({ \ int __changed = !pte_same(*(__ptep), __entry); \ if (__changed) { \ set_pte_at((__vma)->vm_mm, (__address), __ptep, __entry); \ flush_tlb_page(__vma, __address); \ } \ __changed; \ }) #include #endif /* !(__ASSEMBLY__) */ #define VMALLOC_START _AC(0xfe600000,UL) #define VMALLOC_END _AC(0xffc00000,UL) /* We provide our own get_unmapped_area to cope with VA holes for userland */ #define HAVE_ARCH_UNMAPPED_AREA /* * No page table caches to initialise */ #define pgtable_cache_init() do { } while (0) #endif /* !(_SPARC_PGTABLE_H) */