pgtable_32.h 16 KB

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  1. /* SPDX-License-Identifier: GPL-2.0 */
  2. #ifndef __ASM_SH_PGTABLE_32_H
  3. #define __ASM_SH_PGTABLE_32_H
  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. * SH-X2 MMUs and extended PTEs
  30. *
  31. * SH-X2 supports an extended mode TLB with split data arrays due to the
  32. * number of bits needed for PR and SZ (now EPR and ESZ) encodings. The PR and
  33. * SZ bit placeholders still exist in data array 1, but are implemented as
  34. * reserved bits, with the real logic existing in data array 2.
  35. *
  36. * The downside to this is that we can no longer fit everything in to a 32-bit
  37. * PTE encoding, so a 64-bit pte_t is necessary for these parts. On the plus
  38. * side, this gives us quite a few spare bits to play with for future usage.
  39. */
  40. /* Legacy and compat mode bits */
  41. #define _PAGE_WT 0x001 /* WT-bit on SH-4, 0 on SH-3 */
  42. #define _PAGE_HW_SHARED 0x002 /* SH-bit : shared among processes */
  43. #define _PAGE_DIRTY 0x004 /* D-bit : page changed */
  44. #define _PAGE_CACHABLE 0x008 /* C-bit : cachable */
  45. #define _PAGE_SZ0 0x010 /* SZ0-bit : Size of page */
  46. #define _PAGE_RW 0x020 /* PR0-bit : write access allowed */
  47. #define _PAGE_USER 0x040 /* PR1-bit : user space access allowed*/
  48. #define _PAGE_SZ1 0x080 /* SZ1-bit : Size of page (on SH-4) */
  49. #define _PAGE_PRESENT 0x100 /* V-bit : page is valid */
  50. #define _PAGE_PROTNONE 0x200 /* software: if not present */
  51. #define _PAGE_ACCESSED 0x400 /* software: page referenced */
  52. #define _PAGE_SPECIAL 0x800 /* software: special page */
  53. #define _PAGE_SZ_MASK (_PAGE_SZ0 | _PAGE_SZ1)
  54. #define _PAGE_PR_MASK (_PAGE_RW | _PAGE_USER)
  55. /* Extended mode bits */
  56. #define _PAGE_EXT_ESZ0 0x0010 /* ESZ0-bit: Size of page */
  57. #define _PAGE_EXT_ESZ1 0x0020 /* ESZ1-bit: Size of page */
  58. #define _PAGE_EXT_ESZ2 0x0040 /* ESZ2-bit: Size of page */
  59. #define _PAGE_EXT_ESZ3 0x0080 /* ESZ3-bit: Size of page */
  60. #define _PAGE_EXT_USER_EXEC 0x0100 /* EPR0-bit: User space executable */
  61. #define _PAGE_EXT_USER_WRITE 0x0200 /* EPR1-bit: User space writable */
  62. #define _PAGE_EXT_USER_READ 0x0400 /* EPR2-bit: User space readable */
  63. #define _PAGE_EXT_KERN_EXEC 0x0800 /* EPR3-bit: Kernel space executable */
  64. #define _PAGE_EXT_KERN_WRITE 0x1000 /* EPR4-bit: Kernel space writable */
  65. #define _PAGE_EXT_KERN_READ 0x2000 /* EPR5-bit: Kernel space readable */
  66. #define _PAGE_EXT_WIRED 0x4000 /* software: Wire TLB entry */
  67. /* Wrapper for extended mode pgprot twiddling */
  68. #define _PAGE_EXT(x) ((unsigned long long)(x) << 32)
  69. #ifdef CONFIG_X2TLB
  70. #define _PAGE_PCC_MASK 0x00000000 /* No legacy PTEA support */
  71. #else
  72. /* software: moves to PTEA.TC (Timing Control) */
  73. #define _PAGE_PCC_AREA5 0x00000000 /* use BSC registers for area5 */
  74. #define _PAGE_PCC_AREA6 0x80000000 /* use BSC registers for area6 */
  75. /* software: moves to PTEA.SA[2:0] (Space Attributes) */
  76. #define _PAGE_PCC_IODYN 0x00000001 /* IO space, dynamically sized bus */
  77. #define _PAGE_PCC_IO8 0x20000000 /* IO space, 8 bit bus */
  78. #define _PAGE_PCC_IO16 0x20000001 /* IO space, 16 bit bus */
  79. #define _PAGE_PCC_COM8 0x40000000 /* Common Memory space, 8 bit bus */
  80. #define _PAGE_PCC_COM16 0x40000001 /* Common Memory space, 16 bit bus */
  81. #define _PAGE_PCC_ATR8 0x60000000 /* Attribute Memory space, 8 bit bus */
  82. #define _PAGE_PCC_ATR16 0x60000001 /* Attribute Memory space, 6 bit bus */
  83. #define _PAGE_PCC_MASK 0xe0000001
  84. /* copy the ptea attributes */
  85. static inline unsigned long copy_ptea_attributes(unsigned long x)
  86. {
  87. return ((x >> 28) & 0xe) | (x & 0x1);
  88. }
  89. #endif
  90. /* Mask which drops unused bits from the PTEL value */
  91. #if defined(CONFIG_CPU_SH3)
  92. #define _PAGE_CLEAR_FLAGS (_PAGE_PROTNONE | _PAGE_ACCESSED| \
  93. _PAGE_SZ1 | _PAGE_HW_SHARED)
  94. #elif defined(CONFIG_X2TLB)
  95. /* Get rid of the legacy PR/SZ bits when using extended mode */
  96. #define _PAGE_CLEAR_FLAGS (_PAGE_PROTNONE | _PAGE_ACCESSED | \
  97. _PAGE_PR_MASK | _PAGE_SZ_MASK)
  98. #else
  99. #define _PAGE_CLEAR_FLAGS (_PAGE_PROTNONE | _PAGE_ACCESSED)
  100. #endif
  101. #define _PAGE_FLAGS_HARDWARE_MASK (phys_addr_mask() & ~(_PAGE_CLEAR_FLAGS))
  102. /* Hardware flags, page size encoding */
  103. #if !defined(CONFIG_MMU)
  104. # define _PAGE_FLAGS_HARD 0ULL
  105. #elif defined(CONFIG_X2TLB)
  106. # if defined(CONFIG_PAGE_SIZE_4KB)
  107. # define _PAGE_FLAGS_HARD _PAGE_EXT(_PAGE_EXT_ESZ0)
  108. # elif defined(CONFIG_PAGE_SIZE_8KB)
  109. # define _PAGE_FLAGS_HARD _PAGE_EXT(_PAGE_EXT_ESZ1)
  110. # elif defined(CONFIG_PAGE_SIZE_64KB)
  111. # define _PAGE_FLAGS_HARD _PAGE_EXT(_PAGE_EXT_ESZ2)
  112. # endif
  113. #else
  114. # if defined(CONFIG_PAGE_SIZE_4KB)
  115. # define _PAGE_FLAGS_HARD _PAGE_SZ0
  116. # elif defined(CONFIG_PAGE_SIZE_64KB)
  117. # define _PAGE_FLAGS_HARD _PAGE_SZ1
  118. # endif
  119. #endif
  120. #if defined(CONFIG_X2TLB)
  121. # if defined(CONFIG_HUGETLB_PAGE_SIZE_64K)
  122. # define _PAGE_SZHUGE (_PAGE_EXT_ESZ2)
  123. # elif defined(CONFIG_HUGETLB_PAGE_SIZE_256K)
  124. # define _PAGE_SZHUGE (_PAGE_EXT_ESZ0 | _PAGE_EXT_ESZ2)
  125. # elif defined(CONFIG_HUGETLB_PAGE_SIZE_1MB)
  126. # define _PAGE_SZHUGE (_PAGE_EXT_ESZ0 | _PAGE_EXT_ESZ1 | _PAGE_EXT_ESZ2)
  127. # elif defined(CONFIG_HUGETLB_PAGE_SIZE_4MB)
  128. # define _PAGE_SZHUGE (_PAGE_EXT_ESZ3)
  129. # elif defined(CONFIG_HUGETLB_PAGE_SIZE_64MB)
  130. # define _PAGE_SZHUGE (_PAGE_EXT_ESZ2 | _PAGE_EXT_ESZ3)
  131. # endif
  132. # define _PAGE_WIRED (_PAGE_EXT(_PAGE_EXT_WIRED))
  133. #else
  134. # if defined(CONFIG_HUGETLB_PAGE_SIZE_64K)
  135. # define _PAGE_SZHUGE (_PAGE_SZ1)
  136. # elif defined(CONFIG_HUGETLB_PAGE_SIZE_1MB)
  137. # define _PAGE_SZHUGE (_PAGE_SZ0 | _PAGE_SZ1)
  138. # endif
  139. # define _PAGE_WIRED (0)
  140. #endif
  141. /*
  142. * Stub out _PAGE_SZHUGE if we don't have a good definition for it,
  143. * to make pte_mkhuge() happy.
  144. */
  145. #ifndef _PAGE_SZHUGE
  146. # define _PAGE_SZHUGE (_PAGE_FLAGS_HARD)
  147. #endif
  148. /*
  149. * Mask of bits that are to be preserved across pgprot changes.
  150. */
  151. #define _PAGE_CHG_MASK \
  152. (PTE_MASK | _PAGE_ACCESSED | _PAGE_CACHABLE | \
  153. _PAGE_DIRTY | _PAGE_SPECIAL)
  154. #ifndef __ASSEMBLY__
  155. #if defined(CONFIG_X2TLB) /* SH-X2 TLB */
  156. #define PAGE_NONE __pgprot(_PAGE_PROTNONE | _PAGE_CACHABLE | \
  157. _PAGE_ACCESSED | _PAGE_FLAGS_HARD)
  158. #define PAGE_SHARED __pgprot(_PAGE_PRESENT | _PAGE_ACCESSED | \
  159. _PAGE_CACHABLE | _PAGE_FLAGS_HARD | \
  160. _PAGE_EXT(_PAGE_EXT_KERN_READ | \
  161. _PAGE_EXT_KERN_WRITE | \
  162. _PAGE_EXT_USER_READ | \
  163. _PAGE_EXT_USER_WRITE))
  164. #define PAGE_EXECREAD __pgprot(_PAGE_PRESENT | _PAGE_ACCESSED | \
  165. _PAGE_CACHABLE | _PAGE_FLAGS_HARD | \
  166. _PAGE_EXT(_PAGE_EXT_KERN_EXEC | \
  167. _PAGE_EXT_KERN_READ | \
  168. _PAGE_EXT_USER_EXEC | \
  169. _PAGE_EXT_USER_READ))
  170. #define PAGE_COPY PAGE_EXECREAD
  171. #define PAGE_READONLY __pgprot(_PAGE_PRESENT | _PAGE_ACCESSED | \
  172. _PAGE_CACHABLE | _PAGE_FLAGS_HARD | \
  173. _PAGE_EXT(_PAGE_EXT_KERN_READ | \
  174. _PAGE_EXT_USER_READ))
  175. #define PAGE_WRITEONLY __pgprot(_PAGE_PRESENT | _PAGE_ACCESSED | \
  176. _PAGE_CACHABLE | _PAGE_FLAGS_HARD | \
  177. _PAGE_EXT(_PAGE_EXT_KERN_WRITE | \
  178. _PAGE_EXT_USER_WRITE))
  179. #define PAGE_RWX __pgprot(_PAGE_PRESENT | _PAGE_ACCESSED | \
  180. _PAGE_CACHABLE | _PAGE_FLAGS_HARD | \
  181. _PAGE_EXT(_PAGE_EXT_KERN_WRITE | \
  182. _PAGE_EXT_KERN_READ | \
  183. _PAGE_EXT_KERN_EXEC | \
  184. _PAGE_EXT_USER_WRITE | \
  185. _PAGE_EXT_USER_READ | \
  186. _PAGE_EXT_USER_EXEC))
  187. #define PAGE_KERNEL __pgprot(_PAGE_PRESENT | _PAGE_CACHABLE | \
  188. _PAGE_DIRTY | _PAGE_ACCESSED | \
  189. _PAGE_HW_SHARED | _PAGE_FLAGS_HARD | \
  190. _PAGE_EXT(_PAGE_EXT_KERN_READ | \
  191. _PAGE_EXT_KERN_WRITE | \
  192. _PAGE_EXT_KERN_EXEC))
  193. #define PAGE_KERNEL_NOCACHE \
  194. __pgprot(_PAGE_PRESENT | _PAGE_DIRTY | \
  195. _PAGE_ACCESSED | _PAGE_HW_SHARED | \
  196. _PAGE_FLAGS_HARD | \
  197. _PAGE_EXT(_PAGE_EXT_KERN_READ | \
  198. _PAGE_EXT_KERN_WRITE | \
  199. _PAGE_EXT_KERN_EXEC))
  200. #define PAGE_KERNEL_RO __pgprot(_PAGE_PRESENT | _PAGE_CACHABLE | \
  201. _PAGE_DIRTY | _PAGE_ACCESSED | \
  202. _PAGE_HW_SHARED | _PAGE_FLAGS_HARD | \
  203. _PAGE_EXT(_PAGE_EXT_KERN_READ | \
  204. _PAGE_EXT_KERN_EXEC))
  205. #define PAGE_KERNEL_PCC(slot, type) \
  206. __pgprot(0)
  207. #elif defined(CONFIG_MMU) /* SH-X TLB */
  208. #define PAGE_NONE __pgprot(_PAGE_PROTNONE | _PAGE_CACHABLE | \
  209. _PAGE_ACCESSED | _PAGE_FLAGS_HARD)
  210. #define PAGE_SHARED __pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_USER | \
  211. _PAGE_CACHABLE | _PAGE_ACCESSED | \
  212. _PAGE_FLAGS_HARD)
  213. #define PAGE_COPY __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_CACHABLE | \
  214. _PAGE_ACCESSED | _PAGE_FLAGS_HARD)
  215. #define PAGE_READONLY __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_CACHABLE | \
  216. _PAGE_ACCESSED | _PAGE_FLAGS_HARD)
  217. #define PAGE_EXECREAD PAGE_READONLY
  218. #define PAGE_RWX PAGE_SHARED
  219. #define PAGE_WRITEONLY PAGE_SHARED
  220. #define PAGE_KERNEL __pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_CACHABLE | \
  221. _PAGE_DIRTY | _PAGE_ACCESSED | \
  222. _PAGE_HW_SHARED | _PAGE_FLAGS_HARD)
  223. #define PAGE_KERNEL_NOCACHE \
  224. __pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_DIRTY | \
  225. _PAGE_ACCESSED | _PAGE_HW_SHARED | \
  226. _PAGE_FLAGS_HARD)
  227. #define PAGE_KERNEL_RO __pgprot(_PAGE_PRESENT | _PAGE_CACHABLE | \
  228. _PAGE_DIRTY | _PAGE_ACCESSED | \
  229. _PAGE_HW_SHARED | _PAGE_FLAGS_HARD)
  230. #define PAGE_KERNEL_PCC(slot, type) \
  231. __pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_DIRTY | \
  232. _PAGE_ACCESSED | _PAGE_FLAGS_HARD | \
  233. (slot ? _PAGE_PCC_AREA5 : _PAGE_PCC_AREA6) | \
  234. (type))
  235. #else /* no mmu */
  236. #define PAGE_NONE __pgprot(0)
  237. #define PAGE_SHARED __pgprot(0)
  238. #define PAGE_COPY __pgprot(0)
  239. #define PAGE_EXECREAD __pgprot(0)
  240. #define PAGE_RWX __pgprot(0)
  241. #define PAGE_READONLY __pgprot(0)
  242. #define PAGE_WRITEONLY __pgprot(0)
  243. #define PAGE_KERNEL __pgprot(0)
  244. #define PAGE_KERNEL_NOCACHE __pgprot(0)
  245. #define PAGE_KERNEL_RO __pgprot(0)
  246. #define PAGE_KERNEL_PCC(slot, type) \
  247. __pgprot(0)
  248. #endif
  249. #endif /* __ASSEMBLY__ */
  250. #ifndef __ASSEMBLY__
  251. /*
  252. * Certain architectures need to do special things when PTEs
  253. * within a page table are directly modified. Thus, the following
  254. * hook is made available.
  255. */
  256. #ifdef CONFIG_X2TLB
  257. static inline void set_pte(pte_t *ptep, pte_t pte)
  258. {
  259. ptep->pte_high = pte.pte_high;
  260. smp_wmb();
  261. ptep->pte_low = pte.pte_low;
  262. }
  263. #else
  264. #define set_pte(pteptr, pteval) (*(pteptr) = pteval)
  265. #endif
  266. #define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval)
  267. /*
  268. * (pmds are folded into pgds so this doesn't get actually called,
  269. * but the define is needed for a generic inline function.)
  270. */
  271. #define set_pmd(pmdptr, pmdval) (*(pmdptr) = pmdval)
  272. #define pfn_pte(pfn, prot) \
  273. __pte(((unsigned long long)(pfn) << PAGE_SHIFT) | pgprot_val(prot))
  274. #define pfn_pmd(pfn, prot) \
  275. __pmd(((unsigned long long)(pfn) << PAGE_SHIFT) | pgprot_val(prot))
  276. #define pte_none(x) (!pte_val(x))
  277. #define pte_present(x) ((x).pte_low & (_PAGE_PRESENT | _PAGE_PROTNONE))
  278. #define pte_clear(mm,addr,xp) do { set_pte_at(mm, addr, xp, __pte(0)); } while (0)
  279. #define pmd_none(x) (!pmd_val(x))
  280. #define pmd_present(x) (pmd_val(x))
  281. #define pmd_clear(xp) do { set_pmd(xp, __pmd(0)); } while (0)
  282. #define pmd_bad(x) (pmd_val(x) & ~PAGE_MASK)
  283. #define pages_to_mb(x) ((x) >> (20-PAGE_SHIFT))
  284. #define pte_page(x) pfn_to_page(pte_pfn(x))
  285. /*
  286. * The following only work if pte_present() is true.
  287. * Undefined behaviour if not..
  288. */
  289. #define pte_not_present(pte) (!((pte).pte_low & _PAGE_PRESENT))
  290. #define pte_dirty(pte) ((pte).pte_low & _PAGE_DIRTY)
  291. #define pte_young(pte) ((pte).pte_low & _PAGE_ACCESSED)
  292. #define pte_special(pte) ((pte).pte_low & _PAGE_SPECIAL)
  293. #ifdef CONFIG_X2TLB
  294. #define pte_write(pte) \
  295. ((pte).pte_high & (_PAGE_EXT_USER_WRITE | _PAGE_EXT_KERN_WRITE))
  296. #else
  297. #define pte_write(pte) ((pte).pte_low & _PAGE_RW)
  298. #endif
  299. #define PTE_BIT_FUNC(h,fn,op) \
  300. static inline pte_t pte_##fn(pte_t pte) { pte.pte_##h op; return pte; }
  301. #ifdef CONFIG_X2TLB
  302. /*
  303. * We cheat a bit in the SH-X2 TLB case. As the permission bits are
  304. * individually toggled (and user permissions are entirely decoupled from
  305. * kernel permissions), we attempt to couple them a bit more sanely here.
  306. */
  307. PTE_BIT_FUNC(high, wrprotect, &= ~(_PAGE_EXT_USER_WRITE | _PAGE_EXT_KERN_WRITE));
  308. PTE_BIT_FUNC(high, mkwrite, |= _PAGE_EXT_USER_WRITE | _PAGE_EXT_KERN_WRITE);
  309. PTE_BIT_FUNC(high, mkhuge, |= _PAGE_SZHUGE);
  310. #else
  311. PTE_BIT_FUNC(low, wrprotect, &= ~_PAGE_RW);
  312. PTE_BIT_FUNC(low, mkwrite, |= _PAGE_RW);
  313. PTE_BIT_FUNC(low, mkhuge, |= _PAGE_SZHUGE);
  314. #endif
  315. PTE_BIT_FUNC(low, mkclean, &= ~_PAGE_DIRTY);
  316. PTE_BIT_FUNC(low, mkdirty, |= _PAGE_DIRTY);
  317. PTE_BIT_FUNC(low, mkold, &= ~_PAGE_ACCESSED);
  318. PTE_BIT_FUNC(low, mkyoung, |= _PAGE_ACCESSED);
  319. PTE_BIT_FUNC(low, mkspecial, |= _PAGE_SPECIAL);
  320. /*
  321. * Macro and implementation to make a page protection as uncachable.
  322. */
  323. #define pgprot_writecombine(prot) \
  324. __pgprot(pgprot_val(prot) & ~_PAGE_CACHABLE)
  325. #define pgprot_noncached pgprot_writecombine
  326. /*
  327. * Conversion functions: convert a page and protection to a page entry,
  328. * and a page entry and page directory to the page they refer to.
  329. *
  330. * extern pte_t mk_pte(struct page *page, pgprot_t pgprot)
  331. */
  332. #define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot))
  333. static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
  334. {
  335. pte.pte_low &= _PAGE_CHG_MASK;
  336. pte.pte_low |= pgprot_val(newprot);
  337. #ifdef CONFIG_X2TLB
  338. pte.pte_high |= pgprot_val(newprot) >> 32;
  339. #endif
  340. return pte;
  341. }
  342. #define pmd_page_vaddr(pmd) ((unsigned long)pmd_val(pmd))
  343. #define pmd_page(pmd) (virt_to_page(pmd_val(pmd)))
  344. /* to find an entry in a page-table-directory. */
  345. #define pgd_index(address) (((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD-1))
  346. #define pgd_offset(mm, address) ((mm)->pgd + pgd_index(address))
  347. #define __pgd_offset(address) pgd_index(address)
  348. /* to find an entry in a kernel page-table-directory */
  349. #define pgd_offset_k(address) pgd_offset(&init_mm, address)
  350. #define __pud_offset(address) (((address) >> PUD_SHIFT) & (PTRS_PER_PUD-1))
  351. #define __pmd_offset(address) (((address) >> PMD_SHIFT) & (PTRS_PER_PMD-1))
  352. /* Find an entry in the third-level page table.. */
  353. #define pte_index(address) ((address >> PAGE_SHIFT) & (PTRS_PER_PTE - 1))
  354. #define __pte_offset(address) pte_index(address)
  355. #define pte_offset_kernel(dir, address) \
  356. ((pte_t *) pmd_page_vaddr(*(dir)) + pte_index(address))
  357. #define pte_offset_map(dir, address) pte_offset_kernel(dir, address)
  358. #define pte_unmap(pte) do { } while (0)
  359. #ifdef CONFIG_X2TLB
  360. #define pte_ERROR(e) \
  361. printk("%s:%d: bad pte %p(%08lx%08lx).\n", __FILE__, __LINE__, \
  362. &(e), (e).pte_high, (e).pte_low)
  363. #define pgd_ERROR(e) \
  364. printk("%s:%d: bad pgd %016llx.\n", __FILE__, __LINE__, pgd_val(e))
  365. #else
  366. #define pte_ERROR(e) \
  367. printk("%s:%d: bad pte %08lx.\n", __FILE__, __LINE__, pte_val(e))
  368. #define pgd_ERROR(e) \
  369. printk("%s:%d: bad pgd %08lx.\n", __FILE__, __LINE__, pgd_val(e))
  370. #endif
  371. /*
  372. * Encode and de-code a swap entry
  373. *
  374. * Constraints:
  375. * _PAGE_PRESENT at bit 8
  376. * _PAGE_PROTNONE at bit 9
  377. *
  378. * For the normal case, we encode the swap type into bits 0:7 and the
  379. * swap offset into bits 10:30. For the 64-bit PTE case, we keep the
  380. * preserved bits in the low 32-bits and use the upper 32 as the swap
  381. * offset (along with a 5-bit type), following the same approach as x86
  382. * PAE. This keeps the logic quite simple.
  383. *
  384. * As is evident by the Alpha code, if we ever get a 64-bit unsigned
  385. * long (swp_entry_t) to match up with the 64-bit PTEs, this all becomes
  386. * much cleaner..
  387. *
  388. * NOTE: We should set ZEROs at the position of _PAGE_PRESENT
  389. * and _PAGE_PROTNONE bits
  390. */
  391. #ifdef CONFIG_X2TLB
  392. #define __swp_type(x) ((x).val & 0x1f)
  393. #define __swp_offset(x) ((x).val >> 5)
  394. #define __swp_entry(type, offset) ((swp_entry_t){ (type) | (offset) << 5})
  395. #define __pte_to_swp_entry(pte) ((swp_entry_t){ (pte).pte_high })
  396. #define __swp_entry_to_pte(x) ((pte_t){ 0, (x).val })
  397. #else
  398. #define __swp_type(x) ((x).val & 0xff)
  399. #define __swp_offset(x) ((x).val >> 10)
  400. #define __swp_entry(type, offset) ((swp_entry_t){(type) | (offset) <<10})
  401. #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) >> 1 })
  402. #define __swp_entry_to_pte(x) ((pte_t) { (x).val << 1 })
  403. #endif
  404. #endif /* __ASSEMBLY__ */
  405. #endif /* __ASM_SH_PGTABLE_32_H */