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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 | #ifndef _ALPHA_PGTABLE_H #define _ALPHA_PGTABLE_H /* * This file contains the functions and defines necessary to modify and use * the Alpha page table tree. * * This hopefully works with any standard Alpha page-size, as defined * in <asm/page.h> (currently 8192). */ #include <linux/config.h> #include <asm/page.h> #include <asm/processor.h> /* For TASK_SIZE */ #include <asm/machvec.h> /* Certain architectures need to do special things when PTEs * within a page table are directly modified. Thus, the following * hook is made available. */ #define set_pte(pteptr, pteval) ((*(pteptr)) = (pteval)) /* PMD_SHIFT determines the size of the area a second-level page table can map */ #define PMD_SHIFT (PAGE_SHIFT + (PAGE_SHIFT-3)) #define PMD_SIZE (1UL << PMD_SHIFT) #define PMD_MASK (~(PMD_SIZE-1)) /* PGDIR_SHIFT determines what a third-level page table entry can map */ #define PGDIR_SHIFT (PAGE_SHIFT + 2*(PAGE_SHIFT-3)) #define PGDIR_SIZE (1UL << PGDIR_SHIFT) #define PGDIR_MASK (~(PGDIR_SIZE-1)) /* * Entries per page directory level: the Alpha is three-level, with * all levels having a one-page page table. * * The PGD is special: the last entry is reserved for self-mapping. */ #define PTRS_PER_PTE (1UL << (PAGE_SHIFT-3)) #define PTRS_PER_PMD (1UL << (PAGE_SHIFT-3)) #define PTRS_PER_PGD ((1UL << (PAGE_SHIFT-3))-1) #define USER_PTRS_PER_PGD (TASK_SIZE / PGDIR_SIZE) /* Number of pointers that fit on a page: this will go away. */ #define PTRS_PER_PAGE (1UL << (PAGE_SHIFT-3)) #define VMALLOC_START 0xFFFFFE0000000000 #define VMALLOC_VMADDR(x) ((unsigned long)(x)) #define VMALLOC_END (~0UL) /* * OSF/1 PAL-code-imposed page table bits */ #define _PAGE_VALID 0x0001 #define _PAGE_FOR 0x0002 /* used for page protection (fault on read) */ #define _PAGE_FOW 0x0004 /* used for page protection (fault on write) */ #define _PAGE_FOE 0x0008 /* used for page protection (fault on exec) */ #define _PAGE_ASM 0x0010 #define _PAGE_KRE 0x0100 /* xxx - see below on the "accessed" bit */ #define _PAGE_URE 0x0200 /* xxx */ #define _PAGE_KWE 0x1000 /* used to do the dirty bit in software */ #define _PAGE_UWE 0x2000 /* used to do the dirty bit in software */ /* .. and these are ours ... */ #define _PAGE_DIRTY 0x20000 #define _PAGE_ACCESSED 0x40000 /* * NOTE! The "accessed" bit isn't necessarily exact: it can be kept exactly * by software (use the KRE/URE/KWE/UWE bits appropriately), but I'll fake it. * Under Linux/AXP, the "accessed" bit just means "read", and I'll just use * the KRE/URE bits to watch for it. That way we don't need to overload the * KWE/UWE bits with both handling dirty and accessed. * * Note that the kernel uses the accessed bit just to check whether to page * out a page or not, so it doesn't have to be exact anyway. */ #define __DIRTY_BITS (_PAGE_DIRTY | _PAGE_KWE | _PAGE_UWE) #define __ACCESS_BITS (_PAGE_ACCESSED | _PAGE_KRE | _PAGE_URE) #define _PFN_MASK 0xFFFFFFFF00000000 #define _PAGE_TABLE (_PAGE_VALID | __DIRTY_BITS | __ACCESS_BITS) #define _PAGE_CHG_MASK (_PFN_MASK | __DIRTY_BITS | __ACCESS_BITS) /* * All the normal masks have the "page accessed" bits on, as any time they are used, * the page is accessed. They are cleared only by the page-out routines */ #define PAGE_NONE __pgprot(_PAGE_VALID | __ACCESS_BITS | _PAGE_FOR | _PAGE_FOW | _PAGE_FOE) #define PAGE_SHARED __pgprot(_PAGE_VALID | __ACCESS_BITS) #define PAGE_COPY __pgprot(_PAGE_VALID | __ACCESS_BITS | _PAGE_FOW) #define PAGE_READONLY __pgprot(_PAGE_VALID | __ACCESS_BITS | _PAGE_FOW) #define PAGE_KERNEL __pgprot(_PAGE_VALID | _PAGE_ASM | _PAGE_KRE | _PAGE_KWE) #define _PAGE_NORMAL(x) __pgprot(_PAGE_VALID | __ACCESS_BITS | (x)) #define _PAGE_P(x) _PAGE_NORMAL((x) | (((x) & _PAGE_FOW)?0:_PAGE_FOW)) #define _PAGE_S(x) _PAGE_NORMAL(x) /* * The hardware can handle write-only mappings, but as the Alpha * architecture does byte-wide writes with a read-modify-write * sequence, it's not practical to have write-without-read privs. * Thus the "-w- -> rw-" and "-wx -> rwx" mapping here (and in * arch/alpha/mm/fault.c) */ /* xwr */ #define __P000 _PAGE_P(_PAGE_FOE | _PAGE_FOW | _PAGE_FOR) #define __P001 _PAGE_P(_PAGE_FOE | _PAGE_FOW) #define __P010 _PAGE_P(_PAGE_FOE) #define __P011 _PAGE_P(_PAGE_FOE) #define __P100 _PAGE_P(_PAGE_FOW | _PAGE_FOR) #define __P101 _PAGE_P(_PAGE_FOW) #define __P110 _PAGE_P(0) #define __P111 _PAGE_P(0) #define __S000 _PAGE_S(_PAGE_FOE | _PAGE_FOW | _PAGE_FOR) #define __S001 _PAGE_S(_PAGE_FOE | _PAGE_FOW) #define __S010 _PAGE_S(_PAGE_FOE) #define __S011 _PAGE_S(_PAGE_FOE) #define __S100 _PAGE_S(_PAGE_FOW | _PAGE_FOR) #define __S101 _PAGE_S(_PAGE_FOW) #define __S110 _PAGE_S(0) #define __S111 _PAGE_S(0) /* * 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_page(void); extern pmd_t * __bad_pagetable(void); extern unsigned long __zero_page(void); #define BAD_PAGETABLE __bad_pagetable() #define BAD_PAGE __bad_page() #define ZERO_PAGE(vaddr) (mem_map + MAP_NR(ZERO_PGE)) /* number of bits that fit into a memory pointer */ #define BITS_PER_PTR (8*sizeof(unsigned long)) /* to align the pointer to a pointer address */ #define PTR_MASK (~(sizeof(void*)-1)) /* sizeof(void*)==1<<SIZEOF_PTR_LOG2 */ #define SIZEOF_PTR_LOG2 3 /* to find an entry in a page-table */ #define PAGE_PTR(address) \ ((unsigned long)(address)>>(PAGE_SHIFT-SIZEOF_PTR_LOG2)&PTR_MASK&~PAGE_MASK) /* * On certain platforms whose physical address space can overlap KSEG, * namely EV6 and above, we must re-twiddle the physaddr to restore the * correct high-order bits. */ #if defined(CONFIG_ALPHA_GENERIC) && defined(USE_48_BIT_KSEG) #error "EV6-only feature in a generic kernel" #endif #if defined(CONFIG_ALPHA_GENERIC) || \ (defined(CONFIG_ALPHA_EV6) && !defined(USE_48_BIT_KSEG)) #define PHYS_TWIDDLE(phys) \ ((((phys) & 0xc0000000000UL) == 0x40000000000UL) \ ? ((phys) ^= 0xc0000000000UL) : (phys)) #else #define PHYS_TWIDDLE(phys) (phys) #endif /* * 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) \ ({ \ pte_t pte; \ \ pte_val(pte) = ((unsigned long)(page - mem_map) << 32) | \ pgprot_val(pgprot); \ pte; \ }) extern inline pte_t mk_pte_phys(unsigned long physpage, pgprot_t pgprot) { pte_t pte; pte_val(pte) = (PHYS_TWIDDLE(physpage) << (32-PAGE_SHIFT)) | pgprot_val(pgprot); return pte; } extern inline pte_t pte_modify(pte_t pte, pgprot_t newprot) { pte_val(pte) = (pte_val(pte) & _PAGE_CHG_MASK) | pgprot_val(newprot); return pte; } extern inline void pmd_set(pmd_t * pmdp, pte_t * ptep) { pmd_val(*pmdp) = _PAGE_TABLE | ((((unsigned long) ptep) - PAGE_OFFSET) << (32-PAGE_SHIFT)); } extern inline void pgd_set(pgd_t * pgdp, pmd_t * pmdp) { pgd_val(*pgdp) = _PAGE_TABLE | ((((unsigned long) pmdp) - PAGE_OFFSET) << (32-PAGE_SHIFT)); } #define pte_pagenr(x) ((unsigned long)((pte_val(x) >> 32))) #define pte_page(x) (mem_map+pte_pagenr(x)) extern inline unsigned long pmd_page(pmd_t pmd) { return PAGE_OFFSET + ((pmd_val(pmd) & _PFN_MASK) >> (32-PAGE_SHIFT)); } extern inline unsigned long pgd_page(pgd_t pgd) { return PAGE_OFFSET + ((pgd_val(pgd) & _PFN_MASK) >> (32-PAGE_SHIFT)); } extern inline int pte_none(pte_t pte) { return !pte_val(pte); } extern inline int pte_present(pte_t pte) { return pte_val(pte) & _PAGE_VALID; } extern inline void pte_clear(pte_t *ptep) { pte_val(*ptep) = 0; } extern inline int pmd_none(pmd_t pmd) { return !pmd_val(pmd); } extern inline int pmd_bad(pmd_t pmd) { return (pmd_val(pmd) & ~_PFN_MASK) != _PAGE_TABLE; } extern inline int pmd_present(pmd_t pmd) { return pmd_val(pmd) & _PAGE_VALID; } extern inline void pmd_clear(pmd_t * pmdp) { pmd_val(*pmdp) = 0; } extern inline int pgd_none(pgd_t pgd) { return !pgd_val(pgd); } extern inline int pgd_bad(pgd_t pgd) { return (pgd_val(pgd) & ~_PFN_MASK) != _PAGE_TABLE; } extern inline int pgd_present(pgd_t pgd) { return pgd_val(pgd) & _PAGE_VALID; } extern inline void pgd_clear(pgd_t * pgdp) { pgd_val(*pgdp) = 0; } #define page_address(page) ((page)->virtual) /* * The following only work if pte_present() is true. * Undefined behaviour if not.. */ extern inline int pte_read(pte_t pte) { return !(pte_val(pte) & _PAGE_FOR); } extern inline int pte_write(pte_t pte) { return !(pte_val(pte) & _PAGE_FOW); } extern inline int pte_exec(pte_t pte) { return !(pte_val(pte) & _PAGE_FOE); } extern inline int pte_dirty(pte_t pte) { return pte_val(pte) & _PAGE_DIRTY; } extern inline int pte_young(pte_t pte) { return pte_val(pte) & _PAGE_ACCESSED; } extern inline pte_t pte_wrprotect(pte_t pte) { pte_val(pte) |= _PAGE_FOW; return pte; } extern inline pte_t pte_rdprotect(pte_t pte) { pte_val(pte) |= _PAGE_FOR; return pte; } extern inline pte_t pte_exprotect(pte_t pte) { pte_val(pte) |= _PAGE_FOE; return pte; } extern inline pte_t pte_mkclean(pte_t pte) { pte_val(pte) &= ~(__DIRTY_BITS); return pte; } extern inline pte_t pte_mkold(pte_t pte) { pte_val(pte) &= ~(__ACCESS_BITS); return pte; } extern inline pte_t pte_mkwrite(pte_t pte) { pte_val(pte) &= ~_PAGE_FOW; return pte; } extern inline pte_t pte_mkread(pte_t pte) { pte_val(pte) &= ~_PAGE_FOR; return pte; } extern inline pte_t pte_mkexec(pte_t pte) { pte_val(pte) &= ~_PAGE_FOE; return pte; } extern inline pte_t pte_mkdirty(pte_t pte) { pte_val(pte) |= __DIRTY_BITS; return pte; } extern inline pte_t pte_mkyoung(pte_t pte) { pte_val(pte) |= __ACCESS_BITS; return pte; } #define PAGE_DIR_OFFSET(tsk,address) pgd_offset((tsk),(address)) /* to find an entry in a kernel page-table-directory */ #define pgd_offset_k(address) pgd_offset(&init_mm, address) /* to find an entry in a page-table-directory. */ #define __pgd_offset(address) ((address >> PGDIR_SHIFT) & (PTRS_PER_PGD-1)) #define pgd_offset(mm, address) ((mm)->pgd+__pgd_offset(address)) /* Find an entry in the second-level page table.. */ extern inline pmd_t * pmd_offset(pgd_t * dir, unsigned long address) { return (pmd_t *) pgd_page(*dir) + ((address >> PMD_SHIFT) & (PTRS_PER_PAGE - 1)); } /* Find an entry in the third-level page table.. */ extern inline pte_t * pte_offset(pmd_t * dir, unsigned long address) { return (pte_t *) pmd_page(*dir) + ((address >> PAGE_SHIFT) & (PTRS_PER_PAGE - 1)); } extern pgd_t swapper_pg_dir[1024]; /* * The Alpha doesn't have any external MMU info: the kernel page * tables contain all the necessary information. */ extern inline void update_mmu_cache(struct vm_area_struct * vma, unsigned long address, pte_t pte) { } /* * Non-present pages: high 24 bits are offset, next 8 bits type, * low 32 bits zero. */ extern inline pte_t mk_swap_pte(unsigned long type, unsigned long offset) { pte_t pte; pte_val(pte) = (type << 32) | (offset << 40); return pte; } #define SWP_TYPE(x) (((x).val >> 32) & 0xff) #define SWP_OFFSET(x) ((x).val >> 40) #define SWP_ENTRY(type, offset) ((swp_entry_t) { pte_val(mk_swap_pte((type),(offset))) }) #define pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) }) #define swp_entry_to_pte(x) ((pte_t) { (x).val }) #define module_map vmalloc #define module_unmap vfree /* Needs to be defined here and not in linux/mm.h, as it is arch dependent */ #define PageSkip(page) (0) #define kern_addr_valid(addr) (1) #define io_remap_page_range(start, busaddr, size, prot) \ remap_page_range(start, virt_to_phys(__ioremap(busaddr)), size, prot) #define pte_ERROR(e) \ printk("%s:%d: bad pte %016lx.\n", __FILE__, __LINE__, pte_val(e)) #define pmd_ERROR(e) \ printk("%s:%d: bad pmd %016lx.\n", __FILE__, __LINE__, pmd_val(e)) #define pgd_ERROR(e) \ printk("%s:%d: bad pgd %016lx.\n", __FILE__, __LINE__, pgd_val(e)) #endif /* _ALPHA_PGTABLE_H */ |