/* $Id: pgtable.h,v 1.110 2001/12/21 04:56:17 davem Exp $ */ #ifndef _SPARC_PGTABLE_H #define _SPARC_PGTABLE_H /* asm-sparc/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 <asm-generic/4level-fixup.h> #include <linux/spinlock.h> #include <linux/swap.h> #include <asm/types.h> #ifdef CONFIG_SUN4 #include <asm/pgtsun4.h> #else #include <asm/pgtsun4c.h> #endif #include <asm/pgtsrmmu.h> #include <asm/vac-ops.h> #include <asm/oplib.h> #include <asm/btfixup.h> #include <asm/system.h> #ifndef __ASSEMBLY__ struct vm_area_struct; struct page; extern void load_mmu(void); extern unsigned long calc_highpages(void); BTFIXUPDEF_SIMM13(pgdir_shift) BTFIXUPDEF_SETHI(pgdir_size) BTFIXUPDEF_SETHI(pgdir_mask) BTFIXUPDEF_SIMM13(ptrs_per_pmd) BTFIXUPDEF_SIMM13(ptrs_per_pgd) BTFIXUPDEF_SIMM13(user_ptrs_per_pgd) #define pte_ERROR(e) __builtin_trap() #define pmd_ERROR(e) __builtin_trap() #define pgd_ERROR(e) __builtin_trap() BTFIXUPDEF_INT(page_none) BTFIXUPDEF_INT(page_copy) BTFIXUPDEF_INT(page_readonly) BTFIXUPDEF_INT(page_kernel) #define PMD_SHIFT SUN4C_PMD_SHIFT #define PMD_SIZE (1UL << PMD_SHIFT) #define PMD_MASK (~(PMD_SIZE-1)) #define PMD_ALIGN(__addr) (((__addr) + ~PMD_MASK) & PMD_MASK) #define PGDIR_SHIFT BTFIXUP_SIMM13(pgdir_shift) #define PGDIR_SIZE BTFIXUP_SETHI(pgdir_size) #define PGDIR_MASK BTFIXUP_SETHI(pgdir_mask) #define PTRS_PER_PTE 1024 #define PTRS_PER_PMD BTFIXUP_SIMM13(ptrs_per_pmd) #define PTRS_PER_PGD BTFIXUP_SIMM13(ptrs_per_pgd) #define USER_PTRS_PER_PGD BTFIXUP_SIMM13(user_ptrs_per_pgd) #define FIRST_USER_ADDRESS 0 #define PTE_SIZE (PTRS_PER_PTE*4) #define PAGE_NONE __pgprot(BTFIXUP_INT(page_none)) extern pgprot_t PAGE_SHARED; #define PAGE_COPY __pgprot(BTFIXUP_INT(page_copy)) #define PAGE_READONLY __pgprot(BTFIXUP_INT(page_readonly)) extern unsigned long page_kernel; #ifdef MODULE #define PAGE_KERNEL page_kernel #else #define PAGE_KERNEL __pgprot(BTFIXUP_INT(page_kernel)) #endif /* Top-level page directory */ extern pgd_t swapper_pg_dir[1024]; extern void paging_init(void); /* Page table for 0-4MB for everybody, on the Sparc this * holds the same as on the i386. */ extern pte_t pg0[1024]; extern pte_t pg1[1024]; extern pte_t pg2[1024]; extern pte_t pg3[1024]; extern unsigned long ptr_in_current_pgd; /* Here is a trick, since mmap.c need the initializer elements for * protection_map[] to be constant at compile time, I set the following * to all zeros. I set it to the real values after I link in the * appropriate MMU page table routines at boot time. */ #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 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)) /* */ BTFIXUPDEF_CALL_CONST(struct page *, pmd_page, pmd_t) BTFIXUPDEF_CALL_CONST(unsigned long, pgd_page_vaddr, pgd_t) #define pmd_page(pmd) BTFIXUP_CALL(pmd_page)(pmd) #define pgd_page_vaddr(pgd) BTFIXUP_CALL(pgd_page_vaddr)(pgd) BTFIXUPDEF_SETHI(none_mask) BTFIXUPDEF_CALL_CONST(int, pte_present, pte_t) BTFIXUPDEF_CALL(void, pte_clear, pte_t *) static inline int pte_none(pte_t pte) { return !(pte_val(pte) & ~BTFIXUP_SETHI(none_mask)); } #define pte_present(pte) BTFIXUP_CALL(pte_present)(pte) #define pte_clear(mm,addr,pte) BTFIXUP_CALL(pte_clear)(pte) BTFIXUPDEF_CALL_CONST(int, pmd_bad, pmd_t) BTFIXUPDEF_CALL_CONST(int, pmd_present, pmd_t) BTFIXUPDEF_CALL(void, pmd_clear, pmd_t *) static inline int pmd_none(pmd_t pmd) { return !(pmd_val(pmd) & ~BTFIXUP_SETHI(none_mask)); } #define pmd_bad(pmd) BTFIXUP_CALL(pmd_bad)(pmd) #define pmd_present(pmd) BTFIXUP_CALL(pmd_present)(pmd) #define pmd_clear(pmd) BTFIXUP_CALL(pmd_clear)(pmd) BTFIXUPDEF_CALL_CONST(int, pgd_none, pgd_t) BTFIXUPDEF_CALL_CONST(int, pgd_bad, pgd_t) BTFIXUPDEF_CALL_CONST(int, pgd_present, pgd_t) BTFIXUPDEF_CALL(void, pgd_clear, pgd_t *) #define pgd_none(pgd) BTFIXUP_CALL(pgd_none)(pgd) #define pgd_bad(pgd) BTFIXUP_CALL(pgd_bad)(pgd) #define pgd_present(pgd) BTFIXUP_CALL(pgd_present)(pgd) #define pgd_clear(pgd) BTFIXUP_CALL(pgd_clear)(pgd) /* * 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); } /* */ 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 pfn_pte(pfn, prot) mk_pte(pfn_to_page(pfn), prot) BTFIXUPDEF_CALL(unsigned long, pte_pfn, pte_t) #define pte_pfn(pte) BTFIXUP_CALL(pte_pfn)(pte) #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) BTFIXUPDEF_CALL_CONST(pgprot_t, pgprot_noncached, pgprot_t) #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) BTFIXUP_CALL(pgprot_noncached)(pgprot) 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, * and sun4c is guaranteed to have no highmem anyway. */ #define pte_offset_map(d, a) pte_offset_kernel(d,a) #define pte_offset_map_nested(d, a) pte_offset_kernel(d,a) #define pte_unmap(pte) do{}while(0) #define pte_unmap_nested(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,pte) BTFIXUP_CALL(update_mmu_cache)(vma,addr,pte) 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 */ BTFIXUPDEF_CALL(unsigned long, pte_to_pgoff, pte_t pte); BTFIXUPDEF_CALL(pte_t, pgoff_to_pte, unsigned long pgoff); #define pte_to_pgoff(pte) BTFIXUP_CALL(pte_to_pgoff)(pte) #define pgoff_to_pte(off) BTFIXUP_CALL(pgoff_to_pte)(off) /* * This is made a constant because mm/fremap.c required a constant. * Note that layout of these bits is different between sun4c.c and srmmu.c. */ #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 sun4: case sun4c: return sun4c_get_pte (addr) << PAGE_SHIFT; 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 sun4: case sun4c: return -1; /* Don't check iospace on sun4c */ 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)) extern int io_remap_pfn_range(struct vm_area_struct *vma, unsigned long from, unsigned long pfn, unsigned long size, pgprot_t prot); /* * For sparc32&64, the pfn in io_remap_pfn_range() carries <iospace> 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) #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); \ } \ (sparc_cpu_model == sun4c) || __changed; \ }) #include <asm-generic/pgtable.h> #endif /* !(__ASSEMBLY__) */ /* 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) */