1#ifndef __ASM_SH_PGTABLE_32_H 2#define __ASM_SH_PGTABLE_32_H 3 4/* Legacy and compat mode bits */ 5#define _PAGE_WT 0x001 /* WT-bit on SH-4, 0 on SH-3 */ 6#define _PAGE_HW_SHARED 0x002 /* SH-bit : shared among processes */ 7#define _PAGE_DIRTY 0x004 /* D-bit : page changed */ 8#define _PAGE_CACHABLE 0x008 /* C-bit : cachable */ 9#define _PAGE_SZ0 0x010 /* SZ0-bit : Size of page */ 10#define _PAGE_RW 0x020 11#define _PAGE_USER 0x040 12#define _PAGE_SZ1 0x080 /* SZ1-bit : Size of page (on SH-4) */ 13#define _PAGE_PRESENT 0x100 /* V-bit : page is valid */ 14#define _PAGE_PROTNONE 0x200 /* software: if not present */ 15#define _PAGE_ACCESSED 0x400 /* software: page referenced */ 16#define _PAGE_FILE _PAGE_WT /* software: pagecache or swap? */ 17#define _PAGE_SPECIAL 0x800 /* software: special page */ 18 19#define _PAGE_SZ_MASK (_PAGE_SZ0 | _PAGE_SZ1) 20#define _PAGE_PR_MASK (_PAGE_RW | _PAGE_USER) 21 22/* Extended mode bits */ 23#define _PAGE_EXT_ESZ0 0x0010 /* ESZ0-bit: Size of page */ 24#define _PAGE_EXT_ESZ1 0x0020 /* ESZ1-bit: Size of page */ 25#define _PAGE_EXT_ESZ2 0x0040 /* ESZ2-bit: Size of page */ 26#define _PAGE_EXT_ESZ3 0x0080 /* ESZ3-bit: Size of page */ 27 28#define _PAGE_EXT_USER_EXEC 0x0100 /* EPR0-bit: User space executable */ 29#define _PAGE_EXT_USER_WRITE 0x0200 /* EPR1-bit: User space writable */ 30#define _PAGE_EXT_USER_READ 0x0400 /* EPR2-bit: User space readable */ 31 32#define _PAGE_EXT_KERN_EXEC 0x0800 /* EPR3-bit: Kernel space executable */ 33#define _PAGE_EXT_KERN_WRITE 0x1000 /* EPR4-bit: Kernel space writable */ 34#define _PAGE_EXT_KERN_READ 0x2000 /* EPR5-bit: Kernel space readable */ 35 36#define _PAGE_EXT_WIRED 0x4000 /* software: Wire TLB entry */ 37 38/* Wrapper for extended mode pgprot twiddling */ 39#define _PAGE_EXT(x) ((unsigned long long)(x) << 32) 40 41#ifdef CONFIG_X2TLB 42#define _PAGE_PCC_MASK 0x00000000 /* No legacy PTEA support */ 43#else 44 45/* software: moves to PTEA.TC (Timing Control) */ 46#define _PAGE_PCC_AREA5 0x00000000 /* use BSC registers for area5 */ 47#define _PAGE_PCC_AREA6 0x80000000 /* use BSC registers for area6 */ 48 49/* software: moves to PTEA.SA[2:0] (Space Attributes) */ 50#define _PAGE_PCC_IODYN 0x00000001 /* IO space, dynamically sized bus */ 51#define _PAGE_PCC_IO8 0x20000000 /* IO space, 8 bit bus */ 52#define _PAGE_PCC_IO16 0x20000001 /* IO space, 16 bit bus */ 53#define _PAGE_PCC_COM8 0x40000000 /* Common Memory space, 8 bit bus */ 54#define _PAGE_PCC_COM16 0x40000001 /* Common Memory space, 16 bit bus */ 55#define _PAGE_PCC_ATR8 0x60000000 /* Attribute Memory space, 8 bit bus */ 56#define _PAGE_PCC_ATR16 0x60000001 /* Attribute Memory space, 6 bit bus */ 57 58#define _PAGE_PCC_MASK 0xe0000001 59 60/* copy the ptea attributes */ 61static inline unsigned long copy_ptea_attributes(unsigned long x) 62{ 63 return ((x >> 28) & 0xe) | (x & 0x1); 64} 65#endif 66 67/* Mask which drops unused bits from the PTEL value */ 68#if defined(CONFIG_CPU_SH3) 69#define _PAGE_CLEAR_FLAGS (_PAGE_PROTNONE | _PAGE_ACCESSED| \ 70 _PAGE_FILE | _PAGE_SZ1 | \ 71 _PAGE_HW_SHARED) 72#elif defined(CONFIG_X2TLB) 73/* Get rid of the legacy PR/SZ bits when using extended mode */ 74#define _PAGE_CLEAR_FLAGS (_PAGE_PROTNONE | _PAGE_ACCESSED | \ 75 _PAGE_FILE | _PAGE_PR_MASK | _PAGE_SZ_MASK) 76#else 77#define _PAGE_CLEAR_FLAGS (_PAGE_PROTNONE | _PAGE_ACCESSED | _PAGE_FILE) 78#endif 79 80#define _PAGE_FLAGS_HARDWARE_MASK (phys_addr_mask() & ~(_PAGE_CLEAR_FLAGS)) 81 82/* Hardware flags, page size encoding */ 83#if !defined(CONFIG_MMU) 84# define _PAGE_FLAGS_HARD 0ULL 85#elif defined(CONFIG_X2TLB) 86# if defined(CONFIG_PAGE_SIZE_4KB) 87# define _PAGE_FLAGS_HARD _PAGE_EXT(_PAGE_EXT_ESZ0) 88# elif defined(CONFIG_PAGE_SIZE_8KB) 89# define _PAGE_FLAGS_HARD _PAGE_EXT(_PAGE_EXT_ESZ1) 90# elif defined(CONFIG_PAGE_SIZE_64KB) 91# define _PAGE_FLAGS_HARD _PAGE_EXT(_PAGE_EXT_ESZ2) 92# endif 93#else 94# if defined(CONFIG_PAGE_SIZE_4KB) 95# define _PAGE_FLAGS_HARD _PAGE_SZ0 96# elif defined(CONFIG_PAGE_SIZE_64KB) 97# define _PAGE_FLAGS_HARD _PAGE_SZ1 98# endif 99#endif 100 101#if defined(CONFIG_X2TLB) 102# if defined(CONFIG_HUGETLB_PAGE_SIZE_64K) 103# define _PAGE_SZHUGE (_PAGE_EXT_ESZ2) 104# elif defined(CONFIG_HUGETLB_PAGE_SIZE_256K) 105# define _PAGE_SZHUGE (_PAGE_EXT_ESZ0 | _PAGE_EXT_ESZ2) 106# elif defined(CONFIG_HUGETLB_PAGE_SIZE_1MB) 107# define _PAGE_SZHUGE (_PAGE_EXT_ESZ0 | _PAGE_EXT_ESZ1 | _PAGE_EXT_ESZ2) 108# elif defined(CONFIG_HUGETLB_PAGE_SIZE_4MB) 109# define _PAGE_SZHUGE (_PAGE_EXT_ESZ3) 110# elif defined(CONFIG_HUGETLB_PAGE_SIZE_64MB) 111# define _PAGE_SZHUGE (_PAGE_EXT_ESZ2 | _PAGE_EXT_ESZ3) 112# endif 113# define _PAGE_WIRED (_PAGE_EXT(_PAGE_EXT_WIRED)) 114#else 115# if defined(CONFIG_HUGETLB_PAGE_SIZE_64K) 116# define _PAGE_SZHUGE (_PAGE_SZ1) 117# elif defined(CONFIG_HUGETLB_PAGE_SIZE_1MB) 118# define _PAGE_SZHUGE (_PAGE_SZ0 | _PAGE_SZ1) 119# endif 120# define _PAGE_WIRED (0) 121#endif 122 123/* 124 * Stub out _PAGE_SZHUGE if we don't have a good definition for it, 125 * to make pte_mkhuge() happy. 126 */ 127#ifndef _PAGE_SZHUGE 128# define _PAGE_SZHUGE (_PAGE_FLAGS_HARD) 129#endif 130 131/* 132 * Mask of bits that are to be preserved accross pgprot changes. 133 */ 134#define _PAGE_CHG_MASK \ 135 (PTE_MASK | _PAGE_ACCESSED | _PAGE_CACHABLE | \ 136 _PAGE_DIRTY | _PAGE_SPECIAL) 137 138#ifndef __ASSEMBLY__ 139 140#if defined(CONFIG_X2TLB) /* SH-X2 TLB */ 141#define PAGE_NONE __pgprot(_PAGE_PROTNONE | _PAGE_CACHABLE | \ 142 _PAGE_ACCESSED | _PAGE_FLAGS_HARD) 143 144#define PAGE_SHARED __pgprot(_PAGE_PRESENT | _PAGE_ACCESSED | \ 145 _PAGE_CACHABLE | _PAGE_FLAGS_HARD | \ 146 _PAGE_EXT(_PAGE_EXT_KERN_READ | \ 147 _PAGE_EXT_KERN_WRITE | \ 148 _PAGE_EXT_USER_READ | \ 149 _PAGE_EXT_USER_WRITE)) 150 151#define PAGE_EXECREAD __pgprot(_PAGE_PRESENT | _PAGE_ACCESSED | \ 152 _PAGE_CACHABLE | _PAGE_FLAGS_HARD | \ 153 _PAGE_EXT(_PAGE_EXT_KERN_EXEC | \ 154 _PAGE_EXT_KERN_READ | \ 155 _PAGE_EXT_USER_EXEC | \ 156 _PAGE_EXT_USER_READ)) 157 158#define PAGE_COPY PAGE_EXECREAD 159 160#define PAGE_READONLY __pgprot(_PAGE_PRESENT | _PAGE_ACCESSED | \ 161 _PAGE_CACHABLE | _PAGE_FLAGS_HARD | \ 162 _PAGE_EXT(_PAGE_EXT_KERN_READ | \ 163 _PAGE_EXT_USER_READ)) 164 165#define PAGE_WRITEONLY __pgprot(_PAGE_PRESENT | _PAGE_ACCESSED | \ 166 _PAGE_CACHABLE | _PAGE_FLAGS_HARD | \ 167 _PAGE_EXT(_PAGE_EXT_KERN_WRITE | \ 168 _PAGE_EXT_USER_WRITE)) 169 170#define PAGE_RWX __pgprot(_PAGE_PRESENT | _PAGE_ACCESSED | \ 171 _PAGE_CACHABLE | _PAGE_FLAGS_HARD | \ 172 _PAGE_EXT(_PAGE_EXT_KERN_WRITE | \ 173 _PAGE_EXT_KERN_READ | \ 174 _PAGE_EXT_KERN_EXEC | \ 175 _PAGE_EXT_USER_WRITE | \ 176 _PAGE_EXT_USER_READ | \ 177 _PAGE_EXT_USER_EXEC)) 178 179#define PAGE_KERNEL __pgprot(_PAGE_PRESENT | _PAGE_CACHABLE | \ 180 _PAGE_DIRTY | _PAGE_ACCESSED | \ 181 _PAGE_HW_SHARED | _PAGE_FLAGS_HARD | \ 182 _PAGE_EXT(_PAGE_EXT_KERN_READ | \ 183 _PAGE_EXT_KERN_WRITE | \ 184 _PAGE_EXT_KERN_EXEC)) 185 186#define PAGE_KERNEL_NOCACHE \ 187 __pgprot(_PAGE_PRESENT | _PAGE_DIRTY | \ 188 _PAGE_ACCESSED | _PAGE_HW_SHARED | \ 189 _PAGE_FLAGS_HARD | \ 190 _PAGE_EXT(_PAGE_EXT_KERN_READ | \ 191 _PAGE_EXT_KERN_WRITE | \ 192 _PAGE_EXT_KERN_EXEC)) 193 194#define PAGE_KERNEL_RO __pgprot(_PAGE_PRESENT | _PAGE_CACHABLE | \ 195 _PAGE_DIRTY | _PAGE_ACCESSED | \ 196 _PAGE_HW_SHARED | _PAGE_FLAGS_HARD | \ 197 _PAGE_EXT(_PAGE_EXT_KERN_READ | \ 198 _PAGE_EXT_KERN_EXEC)) 199 200#define PAGE_KERNEL_PCC(slot, type) \ 201 __pgprot(_PAGE_PRESENT | _PAGE_DIRTY | \ 202 _PAGE_ACCESSED | _PAGE_FLAGS_HARD | \ 203 _PAGE_EXT(_PAGE_EXT_KERN_READ | \ 204 _PAGE_EXT_KERN_WRITE | \ 205 _PAGE_EXT_KERN_EXEC) \ 206 (slot ? _PAGE_PCC_AREA5 : _PAGE_PCC_AREA6) | \ 207 (type)) 208 209#elif defined(CONFIG_MMU) /* SH-X TLB */ 210#define PAGE_NONE __pgprot(_PAGE_PROTNONE | _PAGE_CACHABLE | \ 211 _PAGE_ACCESSED | _PAGE_FLAGS_HARD) 212 213#define PAGE_SHARED __pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_USER | \ 214 _PAGE_CACHABLE | _PAGE_ACCESSED | \ 215 _PAGE_FLAGS_HARD) 216 217#define PAGE_COPY __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_CACHABLE | \ 218 _PAGE_ACCESSED | _PAGE_FLAGS_HARD) 219 220#define PAGE_READONLY __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_CACHABLE | \ 221 _PAGE_ACCESSED | _PAGE_FLAGS_HARD) 222 223#define PAGE_EXECREAD PAGE_READONLY 224#define PAGE_RWX PAGE_SHARED 225#define PAGE_WRITEONLY PAGE_SHARED 226 227#define PAGE_KERNEL __pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_CACHABLE | \ 228 _PAGE_DIRTY | _PAGE_ACCESSED | \ 229 _PAGE_HW_SHARED | _PAGE_FLAGS_HARD) 230 231#define PAGE_KERNEL_NOCACHE \ 232 __pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_DIRTY | \ 233 _PAGE_ACCESSED | _PAGE_HW_SHARED | \ 234 _PAGE_FLAGS_HARD) 235 236#define PAGE_KERNEL_RO __pgprot(_PAGE_PRESENT | _PAGE_CACHABLE | \ 237 _PAGE_DIRTY | _PAGE_ACCESSED | \ 238 _PAGE_HW_SHARED | _PAGE_FLAGS_HARD) 239 240#define PAGE_KERNEL_PCC(slot, type) \ 241 __pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_DIRTY | \ 242 _PAGE_ACCESSED | _PAGE_FLAGS_HARD | \ 243 (slot ? _PAGE_PCC_AREA5 : _PAGE_PCC_AREA6) | \ 244 (type)) 245#else /* no mmu */ 246#define PAGE_NONE __pgprot(0) 247#define PAGE_SHARED __pgprot(0) 248#define PAGE_COPY __pgprot(0) 249#define PAGE_EXECREAD __pgprot(0) 250#define PAGE_RWX __pgprot(0) 251#define PAGE_READONLY __pgprot(0) 252#define PAGE_WRITEONLY __pgprot(0) 253#define PAGE_KERNEL __pgprot(0) 254#define PAGE_KERNEL_NOCACHE __pgprot(0) 255#define PAGE_KERNEL_RO __pgprot(0) 256 257#define PAGE_KERNEL_PCC(slot, type) \ 258 __pgprot(0) 259#endif 260 261#endif /* __ASSEMBLY__ */ 262 263#ifndef __ASSEMBLY__ 264 265/* 266 * Certain architectures need to do special things when PTEs 267 * within a page table are directly modified. Thus, the following 268 * hook is made available. 269 */ 270#ifdef CONFIG_X2TLB 271static inline void set_pte(pte_t *ptep, pte_t pte) 272{ 273 ptep->pte_high = pte.pte_high; 274 smp_wmb(); 275 ptep->pte_low = pte.pte_low; 276} 277#else 278#define set_pte(pteptr, pteval) (*(pteptr) = pteval) 279#endif 280 281#define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval) 282 283/* 284 * (pmds are folded into pgds so this doesn't get actually called, 285 * but the define is needed for a generic inline function.) 286 */ 287#define set_pmd(pmdptr, pmdval) (*(pmdptr) = pmdval) 288 289#define pfn_pte(pfn, prot) \ 290 __pte(((unsigned long long)(pfn) << PAGE_SHIFT) | pgprot_val(prot)) 291#define pfn_pmd(pfn, prot) \ 292 __pmd(((unsigned long long)(pfn) << PAGE_SHIFT) | pgprot_val(prot)) 293 294#define pte_none(x) (!pte_val(x)) 295#define pte_present(x) ((x).pte_low & (_PAGE_PRESENT | _PAGE_PROTNONE)) 296 297#define pte_clear(mm,addr,xp) do { set_pte_at(mm, addr, xp, __pte(0)); } while (0) 298 299#define pmd_none(x) (!pmd_val(x)) 300#define pmd_present(x) (pmd_val(x)) 301#define pmd_clear(xp) do { set_pmd(xp, __pmd(0)); } while (0) 302#define pmd_bad(x) (pmd_val(x) & ~PAGE_MASK) 303 304#define pages_to_mb(x) ((x) >> (20-PAGE_SHIFT)) 305#define pte_page(x) pfn_to_page(pte_pfn(x)) 306 307/* 308 * The following only work if pte_present() is true. 309 * Undefined behaviour if not.. 310 */ 311#define pte_not_present(pte) (!((pte).pte_low & _PAGE_PRESENT)) 312#define pte_dirty(pte) ((pte).pte_low & _PAGE_DIRTY) 313#define pte_young(pte) ((pte).pte_low & _PAGE_ACCESSED) 314#define pte_file(pte) ((pte).pte_low & _PAGE_FILE) 315#define pte_special(pte) ((pte).pte_low & _PAGE_SPECIAL) 316 317#ifdef CONFIG_X2TLB 318#define pte_write(pte) \ 319 ((pte).pte_high & (_PAGE_EXT_USER_WRITE | _PAGE_EXT_KERN_WRITE)) 320#else 321#define pte_write(pte) ((pte).pte_low & _PAGE_RW) 322#endif 323 324#define PTE_BIT_FUNC(h,fn,op) \ 325static inline pte_t pte_##fn(pte_t pte) { pte.pte_##h op; return pte; } 326 327#ifdef CONFIG_X2TLB 328/* 329 * We cheat a bit in the SH-X2 TLB case. As the permission bits are 330 * individually toggled (and user permissions are entirely decoupled from 331 * kernel permissions), we attempt to couple them a bit more sanely here. 332 */ 333PTE_BIT_FUNC(high, wrprotect, &= ~(_PAGE_EXT_USER_WRITE | _PAGE_EXT_KERN_WRITE)); 334PTE_BIT_FUNC(high, mkwrite, |= _PAGE_EXT_USER_WRITE | _PAGE_EXT_KERN_WRITE); 335PTE_BIT_FUNC(high, mkhuge, |= _PAGE_SZHUGE); 336#else 337PTE_BIT_FUNC(low, wrprotect, &= ~_PAGE_RW); 338PTE_BIT_FUNC(low, mkwrite, |= _PAGE_RW); 339PTE_BIT_FUNC(low, mkhuge, |= _PAGE_SZHUGE); 340#endif 341 342PTE_BIT_FUNC(low, mkclean, &= ~_PAGE_DIRTY); 343PTE_BIT_FUNC(low, mkdirty, |= _PAGE_DIRTY); 344PTE_BIT_FUNC(low, mkold, &= ~_PAGE_ACCESSED); 345PTE_BIT_FUNC(low, mkyoung, |= _PAGE_ACCESSED); 346PTE_BIT_FUNC(low, mkspecial, |= _PAGE_SPECIAL); 347 348#define __HAVE_ARCH_PTE_SPECIAL 349 350/* 351 * Macro and implementation to make a page protection as uncachable. 352 */ 353#define pgprot_writecombine(prot) \ 354 __pgprot(pgprot_val(prot) & ~_PAGE_CACHABLE) 355 356#define pgprot_noncached pgprot_writecombine 357 358/* 359 * Conversion functions: convert a page and protection to a page entry, 360 * and a page entry and page directory to the page they refer to. 361 * 362 * extern pte_t mk_pte(struct page *page, pgprot_t pgprot) 363 */ 364#define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot)) 365 366static inline pte_t pte_modify(pte_t pte, pgprot_t newprot) 367{ 368 pte.pte_low &= _PAGE_CHG_MASK; 369 pte.pte_low |= pgprot_val(newprot); 370 371#ifdef CONFIG_X2TLB 372 pte.pte_high |= pgprot_val(newprot) >> 32; 373#endif 374 375 return pte; 376} 377 378#define pmd_page_vaddr(pmd) ((unsigned long)pmd_val(pmd)) 379#define pmd_page(pmd) (virt_to_page(pmd_val(pmd))) 380 381/* to find an entry in a page-table-directory. */ 382#define pgd_index(address) (((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD-1)) 383#define pgd_offset(mm, address) ((mm)->pgd + pgd_index(address)) 384#define __pgd_offset(address) pgd_index(address) 385 386/* to find an entry in a kernel page-table-directory */ 387#define pgd_offset_k(address) pgd_offset(&init_mm, address) 388 389#define __pud_offset(address) (((address) >> PUD_SHIFT) & (PTRS_PER_PUD-1)) 390#define __pmd_offset(address) (((address) >> PMD_SHIFT) & (PTRS_PER_PMD-1)) 391 392/* Find an entry in the third-level page table.. */ 393#define pte_index(address) ((address >> PAGE_SHIFT) & (PTRS_PER_PTE - 1)) 394#define __pte_offset(address) pte_index(address) 395 396#define pte_offset_kernel(dir, address) \ 397 ((pte_t *) pmd_page_vaddr(*(dir)) + pte_index(address)) 398#define pte_offset_map(dir, address) pte_offset_kernel(dir, address) 399#define pte_offset_map_nested(dir, address) pte_offset_kernel(dir, address) 400 401#define pte_unmap(pte) do { } while (0) 402#define pte_unmap_nested(pte) do { } while (0) 403 404#ifdef CONFIG_X2TLB 405#define pte_ERROR(e) \ 406 printk("%s:%d: bad pte %p(%08lx%08lx).\n", __FILE__, __LINE__, \ 407 &(e), (e).pte_high, (e).pte_low) 408#define pgd_ERROR(e) \ 409 printk("%s:%d: bad pgd %016llx.\n", __FILE__, __LINE__, pgd_val(e)) 410#else 411#define pte_ERROR(e) \ 412 printk("%s:%d: bad pte %08lx.\n", __FILE__, __LINE__, pte_val(e)) 413#define pgd_ERROR(e) \ 414 printk("%s:%d: bad pgd %08lx.\n", __FILE__, __LINE__, pgd_val(e)) 415#endif 416 417/* 418 * Encode and de-code a swap entry 419 * 420 * Constraints: 421 * _PAGE_FILE at bit 0 422 * _PAGE_PRESENT at bit 8 423 * _PAGE_PROTNONE at bit 9 424 * 425 * For the normal case, we encode the swap type into bits 0:7 and the 426 * swap offset into bits 10:30. For the 64-bit PTE case, we keep the 427 * preserved bits in the low 32-bits and use the upper 32 as the swap 428 * offset (along with a 5-bit type), following the same approach as x86 429 * PAE. This keeps the logic quite simple, and allows for a full 32 430 * PTE_FILE_MAX_BITS, as opposed to the 29-bits we're constrained with 431 * in the pte_low case. 432 * 433 * As is evident by the Alpha code, if we ever get a 64-bit unsigned 434 * long (swp_entry_t) to match up with the 64-bit PTEs, this all becomes 435 * much cleaner.. 436 * 437 * NOTE: We should set ZEROs at the position of _PAGE_PRESENT 438 * and _PAGE_PROTNONE bits 439 */ 440#ifdef CONFIG_X2TLB 441#define __swp_type(x) ((x).val & 0x1f) 442#define __swp_offset(x) ((x).val >> 5) 443#define __swp_entry(type, offset) ((swp_entry_t){ (type) | (offset) << 5}) 444#define __pte_to_swp_entry(pte) ((swp_entry_t){ (pte).pte_high }) 445#define __swp_entry_to_pte(x) ((pte_t){ 0, (x).val }) 446 447/* 448 * Encode and decode a nonlinear file mapping entry 449 */ 450#define pte_to_pgoff(pte) ((pte).pte_high) 451#define pgoff_to_pte(off) ((pte_t) { _PAGE_FILE, (off) }) 452 453#define PTE_FILE_MAX_BITS 32 454#else 455#define __swp_type(x) ((x).val & 0xff) 456#define __swp_offset(x) ((x).val >> 10) 457#define __swp_entry(type, offset) ((swp_entry_t){(type) | (offset) <<10}) 458 459#define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) >> 1 }) 460#define __swp_entry_to_pte(x) ((pte_t) { (x).val << 1 }) 461 462/* 463 * Encode and decode a nonlinear file mapping entry 464 */ 465#define PTE_FILE_MAX_BITS 29 466#define pte_to_pgoff(pte) (pte_val(pte) >> 1) 467#define pgoff_to_pte(off) ((pte_t) { ((off) << 1) | _PAGE_FILE }) 468#endif 469 470#endif /* __ASSEMBLY__ */ 471#endif /* __ASM_SH_PGTABLE_32_H */ 472