1 #ifndef __ASM_SH_PGTABLE_32_H 2 #define __ASM_SH_PGTABLE_32_H 3 4 /* 5 * Linux PTEL encoding. 6 * 7 * Hardware and software bit definitions for the PTEL value (see below for 8 * notes on SH-X2 MMUs and 64-bit PTEs): 9 * 10 * - Bits 0 and 7 are reserved on SH-3 (_PAGE_WT and _PAGE_SZ1 on SH-4). 11 * 12 * - Bit 1 is the SH-bit, but is unused on SH-3 due to an MMU bug (the 13 * hardware PTEL value can't have the SH-bit set when MMUCR.IX is set, 14 * which is the default in cpu-sh3/mmu_context.h:MMU_CONTROL_INIT). 15 * 16 * In order to keep this relatively clean, do not use these for defining 17 * SH-3 specific flags until all of the other unused bits have been 18 * exhausted. 19 * 20 * - Bit 9 is reserved by everyone and used by _PAGE_PROTNONE. 21 * 22 * - Bits 10 and 11 are low bits of the PPN that are reserved on >= 4K pages. 23 * Bit 10 is used for _PAGE_ACCESSED, and bit 11 is used for _PAGE_SPECIAL. 24 * 25 * - On 29 bit platforms, bits 31 to 29 are used for the space attributes 26 * and timing control which (together with bit 0) are moved into the 27 * old-style PTEA on the parts that support it. 28 * 29 * XXX: Leave the _PAGE_FILE and _PAGE_WT overhaul for a rainy day. 30 * 31 * SH-X2 MMUs and extended PTEs 32 * 33 * SH-X2 supports an extended mode TLB with split data arrays due to the 34 * number of bits needed for PR and SZ (now EPR and ESZ) encodings. The PR and 35 * SZ bit placeholders still exist in data array 1, but are implemented as 36 * reserved bits, with the real logic existing in data array 2. 37 * 38 * The downside to this is that we can no longer fit everything in to a 32-bit 39 * PTE encoding, so a 64-bit pte_t is necessary for these parts. On the plus 40 * side, this gives us quite a few spare bits to play with for future usage. 41 */ 42 /* Legacy and compat mode bits */ 43 #define _PAGE_WT 0x001 /* WT-bit on SH-4, 0 on SH-3 */ 44 #define _PAGE_HW_SHARED 0x002 /* SH-bit : shared among processes */ 45 #define _PAGE_DIRTY 0x004 /* D-bit : page changed */ 46 #define _PAGE_CACHABLE 0x008 /* C-bit : cachable */ 47 #define _PAGE_SZ0 0x010 /* SZ0-bit : Size of page */ 48 #define _PAGE_RW 0x020 /* PR0-bit : write access allowed */ 49 #define _PAGE_USER 0x040 /* PR1-bit : user space access allowed*/ 50 #define _PAGE_SZ1 0x080 /* SZ1-bit : Size of page (on SH-4) */ 51 #define _PAGE_PRESENT 0x100 /* V-bit : page is valid */ 52 #define _PAGE_PROTNONE 0x200 /* software: if not present */ 53 #define _PAGE_ACCESSED 0x400 /* software: page referenced */ 54 #define _PAGE_FILE _PAGE_WT /* software: pagecache or swap? */ 55 #define _PAGE_SPECIAL 0x800 /* software: special page */ 56 57 #define _PAGE_SZ_MASK (_PAGE_SZ0 | _PAGE_SZ1) 58 #define _PAGE_PR_MASK (_PAGE_RW | _PAGE_USER) 59 60 /* Extended mode bits */ 61 #define _PAGE_EXT_ESZ0 0x0010 /* ESZ0-bit: Size of page */ 62 #define _PAGE_EXT_ESZ1 0x0020 /* ESZ1-bit: Size of page */ 63 #define _PAGE_EXT_ESZ2 0x0040 /* ESZ2-bit: Size of page */ 64 #define _PAGE_EXT_ESZ3 0x0080 /* ESZ3-bit: Size of page */ 65 66 #define _PAGE_EXT_USER_EXEC 0x0100 /* EPR0-bit: User space executable */ 67 #define _PAGE_EXT_USER_WRITE 0x0200 /* EPR1-bit: User space writable */ 68 #define _PAGE_EXT_USER_READ 0x0400 /* EPR2-bit: User space readable */ 69 70 #define _PAGE_EXT_KERN_EXEC 0x0800 /* EPR3-bit: Kernel space executable */ 71 #define _PAGE_EXT_KERN_WRITE 0x1000 /* EPR4-bit: Kernel space writable */ 72 #define _PAGE_EXT_KERN_READ 0x2000 /* EPR5-bit: Kernel space readable */ 73 74 #define _PAGE_EXT_WIRED 0x4000 /* software: Wire TLB entry */ 75 76 /* Wrapper for extended mode pgprot twiddling */ 77 #define _PAGE_EXT(x) ((unsigned long long)(x) << 32) 78 79 /* software: moves to PTEA.TC (Timing Control) */ 80 #define _PAGE_PCC_AREA5 0x00000000 /* use BSC registers for area5 */ 81 #define _PAGE_PCC_AREA6 0x80000000 /* use BSC registers for area6 */ 82 83 /* software: moves to PTEA.SA[2:0] (Space Attributes) */ 84 #define _PAGE_PCC_IODYN 0x00000001 /* IO space, dynamically sized bus */ 85 #define _PAGE_PCC_IO8 0x20000000 /* IO space, 8 bit bus */ 86 #define _PAGE_PCC_IO16 0x20000001 /* IO space, 16 bit bus */ 87 #define _PAGE_PCC_COM8 0x40000000 /* Common Memory space, 8 bit bus */ 88 #define _PAGE_PCC_COM16 0x40000001 /* Common Memory space, 16 bit bus */ 89 #define _PAGE_PCC_ATR8 0x60000000 /* Attribute Memory space, 8 bit bus */ 90 #define _PAGE_PCC_ATR16 0x60000001 /* Attribute Memory space, 6 bit bus */ 91 92 #ifndef CONFIG_X2TLB 93 /* copy the ptea attributes */ 94 static inline unsigned long copy_ptea_attributes(unsigned long x) 95 { 96 return ((x >> 28) & 0xe) | (x & 0x1); 97 } 98 #endif 99 100 /* Mask which drops unused bits from the PTEL value */ 101 #if defined(CONFIG_CPU_SH3) 102 #define _PAGE_CLEAR_FLAGS (_PAGE_PROTNONE | _PAGE_ACCESSED| \ 103 _PAGE_FILE | _PAGE_SZ1 | \ 104 _PAGE_HW_SHARED) 105 #elif defined(CONFIG_X2TLB) 106 /* Get rid of the legacy PR/SZ bits when using extended mode */ 107 #define _PAGE_CLEAR_FLAGS (_PAGE_PROTNONE | _PAGE_ACCESSED | \ 108 _PAGE_FILE | _PAGE_PR_MASK | _PAGE_SZ_MASK) 109 #else 110 #define _PAGE_CLEAR_FLAGS (_PAGE_PROTNONE | _PAGE_ACCESSED | _PAGE_FILE) 111 #endif 112 113 #define _PAGE_FLAGS_HARDWARE_MASK (phys_addr_mask() & ~(_PAGE_CLEAR_FLAGS)) 114 115 /* Hardware flags, page size encoding */ 116 #if !defined(CONFIG_MMU) 117 # define _PAGE_FLAGS_HARD 0ULL 118 #elif defined(CONFIG_X2TLB) 119 # if defined(CONFIG_PAGE_SIZE_4KB) 120 # define _PAGE_FLAGS_HARD _PAGE_EXT(_PAGE_EXT_ESZ0) 121 # elif defined(CONFIG_PAGE_SIZE_8KB) 122 # define _PAGE_FLAGS_HARD _PAGE_EXT(_PAGE_EXT_ESZ1) 123 # elif defined(CONFIG_PAGE_SIZE_64KB) 124 # define _PAGE_FLAGS_HARD _PAGE_EXT(_PAGE_EXT_ESZ2) 125 # endif 126 #else 127 # if defined(CONFIG_PAGE_SIZE_4KB) 128 # define _PAGE_FLAGS_HARD _PAGE_SZ0 129 # elif defined(CONFIG_PAGE_SIZE_64KB) 130 # define _PAGE_FLAGS_HARD _PAGE_SZ1 131 # endif 132 #endif 133 134 #if defined(CONFIG_X2TLB) 135 # if defined(CONFIG_HUGETLB_PAGE_SIZE_64K) 136 # define _PAGE_SZHUGE (_PAGE_EXT_ESZ2) 137 # elif defined(CONFIG_HUGETLB_PAGE_SIZE_256K) 138 # define _PAGE_SZHUGE (_PAGE_EXT_ESZ0 | _PAGE_EXT_ESZ2) 139 # elif defined(CONFIG_HUGETLB_PAGE_SIZE_1MB) 140 # define _PAGE_SZHUGE (_PAGE_EXT_ESZ0 | _PAGE_EXT_ESZ1 | _PAGE_EXT_ESZ2) 141 # elif defined(CONFIG_HUGETLB_PAGE_SIZE_4MB) 142 # define _PAGE_SZHUGE (_PAGE_EXT_ESZ3) 143 # elif defined(CONFIG_HUGETLB_PAGE_SIZE_64MB) 144 # define _PAGE_SZHUGE (_PAGE_EXT_ESZ2 | _PAGE_EXT_ESZ3) 145 # endif 146 # define _PAGE_WIRED (_PAGE_EXT(_PAGE_EXT_WIRED)) 147 #else 148 # if defined(CONFIG_HUGETLB_PAGE_SIZE_64K) 149 # define _PAGE_SZHUGE (_PAGE_SZ1) 150 # elif defined(CONFIG_HUGETLB_PAGE_SIZE_1MB) 151 # define _PAGE_SZHUGE (_PAGE_SZ0 | _PAGE_SZ1) 152 # endif 153 # define _PAGE_WIRED (0) 154 #endif 155 156 /* 157 * Stub out _PAGE_SZHUGE if we don't have a good definition for it, 158 * to make pte_mkhuge() happy. 159 */ 160 #ifndef _PAGE_SZHUGE 161 # define _PAGE_SZHUGE (_PAGE_FLAGS_HARD) 162 #endif 163 164 /* 165 * Mask of bits that are to be preserved accross pgprot changes. 166 */ 167 #define _PAGE_CHG_MASK \ 168 (PTE_MASK | _PAGE_ACCESSED | _PAGE_CACHABLE | \ 169 _PAGE_DIRTY | _PAGE_SPECIAL) 170 171 #ifndef __ASSEMBLY__ 172 173 #if defined(CONFIG_X2TLB) /* SH-X2 TLB */ 174 #define PAGE_NONE __pgprot(_PAGE_PROTNONE | _PAGE_CACHABLE | \ 175 _PAGE_ACCESSED | _PAGE_FLAGS_HARD) 176 177 #define PAGE_SHARED __pgprot(_PAGE_PRESENT | _PAGE_ACCESSED | \ 178 _PAGE_CACHABLE | _PAGE_FLAGS_HARD | \ 179 _PAGE_EXT(_PAGE_EXT_KERN_READ | \ 180 _PAGE_EXT_KERN_WRITE | \ 181 _PAGE_EXT_USER_READ | \ 182 _PAGE_EXT_USER_WRITE)) 183 184 #define PAGE_EXECREAD __pgprot(_PAGE_PRESENT | _PAGE_ACCESSED | \ 185 _PAGE_CACHABLE | _PAGE_FLAGS_HARD | \ 186 _PAGE_EXT(_PAGE_EXT_KERN_EXEC | \ 187 _PAGE_EXT_KERN_READ | \ 188 _PAGE_EXT_USER_EXEC | \ 189 _PAGE_EXT_USER_READ)) 190 191 #define PAGE_COPY PAGE_EXECREAD 192 193 #define PAGE_READONLY __pgprot(_PAGE_PRESENT | _PAGE_ACCESSED | \ 194 _PAGE_CACHABLE | _PAGE_FLAGS_HARD | \ 195 _PAGE_EXT(_PAGE_EXT_KERN_READ | \ 196 _PAGE_EXT_USER_READ)) 197 198 #define PAGE_WRITEONLY __pgprot(_PAGE_PRESENT | _PAGE_ACCESSED | \ 199 _PAGE_CACHABLE | _PAGE_FLAGS_HARD | \ 200 _PAGE_EXT(_PAGE_EXT_KERN_WRITE | \ 201 _PAGE_EXT_USER_WRITE)) 202 203 #define PAGE_RWX __pgprot(_PAGE_PRESENT | _PAGE_ACCESSED | \ 204 _PAGE_CACHABLE | _PAGE_FLAGS_HARD | \ 205 _PAGE_EXT(_PAGE_EXT_KERN_WRITE | \ 206 _PAGE_EXT_KERN_READ | \ 207 _PAGE_EXT_KERN_EXEC | \ 208 _PAGE_EXT_USER_WRITE | \ 209 _PAGE_EXT_USER_READ | \ 210 _PAGE_EXT_USER_EXEC)) 211 212 #define PAGE_KERNEL __pgprot(_PAGE_PRESENT | _PAGE_CACHABLE | \ 213 _PAGE_DIRTY | _PAGE_ACCESSED | \ 214 _PAGE_HW_SHARED | _PAGE_FLAGS_HARD | \ 215 _PAGE_EXT(_PAGE_EXT_KERN_READ | \ 216 _PAGE_EXT_KERN_WRITE | \ 217 _PAGE_EXT_KERN_EXEC)) 218 219 #define PAGE_KERNEL_NOCACHE \ 220 __pgprot(_PAGE_PRESENT | _PAGE_DIRTY | \ 221 _PAGE_ACCESSED | _PAGE_HW_SHARED | \ 222 _PAGE_FLAGS_HARD | \ 223 _PAGE_EXT(_PAGE_EXT_KERN_READ | \ 224 _PAGE_EXT_KERN_WRITE | \ 225 _PAGE_EXT_KERN_EXEC)) 226 227 #define PAGE_KERNEL_RO __pgprot(_PAGE_PRESENT | _PAGE_CACHABLE | \ 228 _PAGE_DIRTY | _PAGE_ACCESSED | \ 229 _PAGE_HW_SHARED | _PAGE_FLAGS_HARD | \ 230 _PAGE_EXT(_PAGE_EXT_KERN_READ | \ 231 _PAGE_EXT_KERN_EXEC)) 232 233 #define PAGE_KERNEL_PCC(slot, type) \ 234 __pgprot(_PAGE_PRESENT | _PAGE_DIRTY | \ 235 _PAGE_ACCESSED | _PAGE_FLAGS_HARD | \ 236 _PAGE_EXT(_PAGE_EXT_KERN_READ | \ 237 _PAGE_EXT_KERN_WRITE | \ 238 _PAGE_EXT_KERN_EXEC) \ 239 (slot ? _PAGE_PCC_AREA5 : _PAGE_PCC_AREA6) | \ 240 (type)) 241 242 #elif defined(CONFIG_MMU) /* SH-X TLB */ 243 #define PAGE_NONE __pgprot(_PAGE_PROTNONE | _PAGE_CACHABLE | \ 244 _PAGE_ACCESSED | _PAGE_FLAGS_HARD) 245 246 #define PAGE_SHARED __pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_USER | \ 247 _PAGE_CACHABLE | _PAGE_ACCESSED | \ 248 _PAGE_FLAGS_HARD) 249 250 #define PAGE_COPY __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_CACHABLE | \ 251 _PAGE_ACCESSED | _PAGE_FLAGS_HARD) 252 253 #define PAGE_READONLY __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_CACHABLE | \ 254 _PAGE_ACCESSED | _PAGE_FLAGS_HARD) 255 256 #define PAGE_EXECREAD PAGE_READONLY 257 #define PAGE_RWX PAGE_SHARED 258 #define PAGE_WRITEONLY PAGE_SHARED 259 260 #define PAGE_KERNEL __pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_CACHABLE | \ 261 _PAGE_DIRTY | _PAGE_ACCESSED | \ 262 _PAGE_HW_SHARED | _PAGE_FLAGS_HARD) 263 264 #define PAGE_KERNEL_NOCACHE \ 265 __pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_DIRTY | \ 266 _PAGE_ACCESSED | _PAGE_HW_SHARED | \ 267 _PAGE_FLAGS_HARD) 268 269 #define PAGE_KERNEL_RO __pgprot(_PAGE_PRESENT | _PAGE_CACHABLE | \ 270 _PAGE_DIRTY | _PAGE_ACCESSED | \ 271 _PAGE_HW_SHARED | _PAGE_FLAGS_HARD) 272 273 #define PAGE_KERNEL_PCC(slot, type) \ 274 __pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_DIRTY | \ 275 _PAGE_ACCESSED | _PAGE_FLAGS_HARD | \ 276 (slot ? _PAGE_PCC_AREA5 : _PAGE_PCC_AREA6) | \ 277 (type)) 278 #else /* no mmu */ 279 #define PAGE_NONE __pgprot(0) 280 #define PAGE_SHARED __pgprot(0) 281 #define PAGE_COPY __pgprot(0) 282 #define PAGE_EXECREAD __pgprot(0) 283 #define PAGE_RWX __pgprot(0) 284 #define PAGE_READONLY __pgprot(0) 285 #define PAGE_WRITEONLY __pgprot(0) 286 #define PAGE_KERNEL __pgprot(0) 287 #define PAGE_KERNEL_NOCACHE __pgprot(0) 288 #define PAGE_KERNEL_RO __pgprot(0) 289 290 #define PAGE_KERNEL_PCC(slot, type) \ 291 __pgprot(0) 292 #endif 293 294 #endif /* __ASSEMBLY__ */ 295 296 #ifndef __ASSEMBLY__ 297 298 /* 299 * Certain architectures need to do special things when PTEs 300 * within a page table are directly modified. Thus, the following 301 * hook is made available. 302 */ 303 #ifdef CONFIG_X2TLB 304 static inline void set_pte(pte_t *ptep, pte_t pte) 305 { 306 ptep->pte_high = pte.pte_high; 307 smp_wmb(); 308 ptep->pte_low = pte.pte_low; 309 } 310 #else 311 #define set_pte(pteptr, pteval) (*(pteptr) = pteval) 312 #endif 313 314 #define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval) 315 316 /* 317 * (pmds are folded into pgds so this doesn't get actually called, 318 * but the define is needed for a generic inline function.) 319 */ 320 #define set_pmd(pmdptr, pmdval) (*(pmdptr) = pmdval) 321 322 #define pfn_pte(pfn, prot) \ 323 __pte(((unsigned long long)(pfn) << PAGE_SHIFT) | pgprot_val(prot)) 324 #define pfn_pmd(pfn, prot) \ 325 __pmd(((unsigned long long)(pfn) << PAGE_SHIFT) | pgprot_val(prot)) 326 327 #define pte_none(x) (!pte_val(x)) 328 #define pte_present(x) ((x).pte_low & (_PAGE_PRESENT | _PAGE_PROTNONE)) 329 330 #define pte_clear(mm,addr,xp) do { set_pte_at(mm, addr, xp, __pte(0)); } while (0) 331 332 #define pmd_none(x) (!pmd_val(x)) 333 #define pmd_present(x) (pmd_val(x)) 334 #define pmd_clear(xp) do { set_pmd(xp, __pmd(0)); } while (0) 335 #define pmd_bad(x) (pmd_val(x) & ~PAGE_MASK) 336 337 #define pages_to_mb(x) ((x) >> (20-PAGE_SHIFT)) 338 #define pte_page(x) pfn_to_page(pte_pfn(x)) 339 340 /* 341 * The following only work if pte_present() is true. 342 * Undefined behaviour if not.. 343 */ 344 #define pte_not_present(pte) (!((pte).pte_low & _PAGE_PRESENT)) 345 #define pte_dirty(pte) ((pte).pte_low & _PAGE_DIRTY) 346 #define pte_young(pte) ((pte).pte_low & _PAGE_ACCESSED) 347 #define pte_file(pte) ((pte).pte_low & _PAGE_FILE) 348 #define pte_special(pte) ((pte).pte_low & _PAGE_SPECIAL) 349 350 #ifdef CONFIG_X2TLB 351 #define pte_write(pte) \ 352 ((pte).pte_high & (_PAGE_EXT_USER_WRITE | _PAGE_EXT_KERN_WRITE)) 353 #else 354 #define pte_write(pte) ((pte).pte_low & _PAGE_RW) 355 #endif 356 357 #define PTE_BIT_FUNC(h,fn,op) \ 358 static inline pte_t pte_##fn(pte_t pte) { pte.pte_##h op; return pte; } 359 360 #ifdef CONFIG_X2TLB 361 /* 362 * We cheat a bit in the SH-X2 TLB case. As the permission bits are 363 * individually toggled (and user permissions are entirely decoupled from 364 * kernel permissions), we attempt to couple them a bit more sanely here. 365 */ 366 PTE_BIT_FUNC(high, wrprotect, &= ~(_PAGE_EXT_USER_WRITE | _PAGE_EXT_KERN_WRITE)); 367 PTE_BIT_FUNC(high, mkwrite, |= _PAGE_EXT_USER_WRITE | _PAGE_EXT_KERN_WRITE); 368 PTE_BIT_FUNC(high, mkhuge, |= _PAGE_SZHUGE); 369 #else 370 PTE_BIT_FUNC(low, wrprotect, &= ~_PAGE_RW); 371 PTE_BIT_FUNC(low, mkwrite, |= _PAGE_RW); 372 PTE_BIT_FUNC(low, mkhuge, |= _PAGE_SZHUGE); 373 #endif 374 375 PTE_BIT_FUNC(low, mkclean, &= ~_PAGE_DIRTY); 376 PTE_BIT_FUNC(low, mkdirty, |= _PAGE_DIRTY); 377 PTE_BIT_FUNC(low, mkold, &= ~_PAGE_ACCESSED); 378 PTE_BIT_FUNC(low, mkyoung, |= _PAGE_ACCESSED); 379 PTE_BIT_FUNC(low, mkspecial, |= _PAGE_SPECIAL); 380 381 #define __HAVE_ARCH_PTE_SPECIAL 382 383 /* 384 * Macro and implementation to make a page protection as uncachable. 385 */ 386 #define pgprot_writecombine(prot) \ 387 __pgprot(pgprot_val(prot) & ~_PAGE_CACHABLE) 388 389 #define pgprot_noncached pgprot_writecombine 390 391 /* 392 * Conversion functions: convert a page and protection to a page entry, 393 * and a page entry and page directory to the page they refer to. 394 * 395 * extern pte_t mk_pte(struct page *page, pgprot_t pgprot) 396 */ 397 #define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot)) 398 399 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot) 400 { 401 pte.pte_low &= _PAGE_CHG_MASK; 402 pte.pte_low |= pgprot_val(newprot); 403 404 #ifdef CONFIG_X2TLB 405 pte.pte_high |= pgprot_val(newprot) >> 32; 406 #endif 407 408 return pte; 409 } 410 411 #define pmd_page_vaddr(pmd) ((unsigned long)pmd_val(pmd)) 412 #define pmd_page(pmd) (virt_to_page(pmd_val(pmd))) 413 414 /* to find an entry in a page-table-directory. */ 415 #define pgd_index(address) (((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD-1)) 416 #define pgd_offset(mm, address) ((mm)->pgd + pgd_index(address)) 417 #define __pgd_offset(address) pgd_index(address) 418 419 /* to find an entry in a kernel page-table-directory */ 420 #define pgd_offset_k(address) pgd_offset(&init_mm, address) 421 422 #define __pud_offset(address) (((address) >> PUD_SHIFT) & (PTRS_PER_PUD-1)) 423 #define __pmd_offset(address) (((address) >> PMD_SHIFT) & (PTRS_PER_PMD-1)) 424 425 /* Find an entry in the third-level page table.. */ 426 #define pte_index(address) ((address >> PAGE_SHIFT) & (PTRS_PER_PTE - 1)) 427 #define __pte_offset(address) pte_index(address) 428 429 #define pte_offset_kernel(dir, address) \ 430 ((pte_t *) pmd_page_vaddr(*(dir)) + pte_index(address)) 431 #define pte_offset_map(dir, address) pte_offset_kernel(dir, address) 432 #define pte_unmap(pte) do { } while (0) 433 434 #ifdef CONFIG_X2TLB 435 #define pte_ERROR(e) \ 436 printk("%s:%d: bad pte %p(%08lx%08lx).\n", __FILE__, __LINE__, \ 437 &(e), (e).pte_high, (e).pte_low) 438 #define pgd_ERROR(e) \ 439 printk("%s:%d: bad pgd %016llx.\n", __FILE__, __LINE__, pgd_val(e)) 440 #else 441 #define pte_ERROR(e) \ 442 printk("%s:%d: bad pte %08lx.\n", __FILE__, __LINE__, pte_val(e)) 443 #define pgd_ERROR(e) \ 444 printk("%s:%d: bad pgd %08lx.\n", __FILE__, __LINE__, pgd_val(e)) 445 #endif 446 447 /* 448 * Encode and de-code a swap entry 449 * 450 * Constraints: 451 * _PAGE_FILE at bit 0 452 * _PAGE_PRESENT at bit 8 453 * _PAGE_PROTNONE at bit 9 454 * 455 * For the normal case, we encode the swap type into bits 0:7 and the 456 * swap offset into bits 10:30. For the 64-bit PTE case, we keep the 457 * preserved bits in the low 32-bits and use the upper 32 as the swap 458 * offset (along with a 5-bit type), following the same approach as x86 459 * PAE. This keeps the logic quite simple, and allows for a full 32 460 * PTE_FILE_MAX_BITS, as opposed to the 29-bits we're constrained with 461 * in the pte_low case. 462 * 463 * As is evident by the Alpha code, if we ever get a 64-bit unsigned 464 * long (swp_entry_t) to match up with the 64-bit PTEs, this all becomes 465 * much cleaner.. 466 * 467 * NOTE: We should set ZEROs at the position of _PAGE_PRESENT 468 * and _PAGE_PROTNONE bits 469 */ 470 #ifdef CONFIG_X2TLB 471 #define __swp_type(x) ((x).val & 0x1f) 472 #define __swp_offset(x) ((x).val >> 5) 473 #define __swp_entry(type, offset) ((swp_entry_t){ (type) | (offset) << 5}) 474 #define __pte_to_swp_entry(pte) ((swp_entry_t){ (pte).pte_high }) 475 #define __swp_entry_to_pte(x) ((pte_t){ 0, (x).val }) 476 477 /* 478 * Encode and decode a nonlinear file mapping entry 479 */ 480 #define pte_to_pgoff(pte) ((pte).pte_high) 481 #define pgoff_to_pte(off) ((pte_t) { _PAGE_FILE, (off) }) 482 483 #define PTE_FILE_MAX_BITS 32 484 #else 485 #define __swp_type(x) ((x).val & 0xff) 486 #define __swp_offset(x) ((x).val >> 10) 487 #define __swp_entry(type, offset) ((swp_entry_t){(type) | (offset) <<10}) 488 489 #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) >> 1 }) 490 #define __swp_entry_to_pte(x) ((pte_t) { (x).val << 1 }) 491 492 /* 493 * Encode and decode a nonlinear file mapping entry 494 */ 495 #define PTE_FILE_MAX_BITS 29 496 #define pte_to_pgoff(pte) (pte_val(pte) >> 1) 497 #define pgoff_to_pte(off) ((pte_t) { ((off) << 1) | _PAGE_FILE }) 498 #endif 499 500 #endif /* __ASSEMBLY__ */ 501 #endif /* __ASM_SH_PGTABLE_32_H */ 502