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Paul Mundt249cfea2007-11-19 18:26:19 +09001#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, bit 11 remains unused.
24 *
Stuart Menefyfc558882007-11-30 18:05:18 +090025 * - 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.
Paul Mundt249cfea2007-11-19 18:26:19 +090028 *
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
56#define _PAGE_SZ_MASK (_PAGE_SZ0 | _PAGE_SZ1)
57#define _PAGE_PR_MASK (_PAGE_RW | _PAGE_USER)
58
59/* Extended mode bits */
60#define _PAGE_EXT_ESZ0 0x0010 /* ESZ0-bit: Size of page */
61#define _PAGE_EXT_ESZ1 0x0020 /* ESZ1-bit: Size of page */
62#define _PAGE_EXT_ESZ2 0x0040 /* ESZ2-bit: Size of page */
63#define _PAGE_EXT_ESZ3 0x0080 /* ESZ3-bit: Size of page */
64
65#define _PAGE_EXT_USER_EXEC 0x0100 /* EPR0-bit: User space executable */
66#define _PAGE_EXT_USER_WRITE 0x0200 /* EPR1-bit: User space writable */
67#define _PAGE_EXT_USER_READ 0x0400 /* EPR2-bit: User space readable */
68
69#define _PAGE_EXT_KERN_EXEC 0x0800 /* EPR3-bit: Kernel space executable */
70#define _PAGE_EXT_KERN_WRITE 0x1000 /* EPR4-bit: Kernel space writable */
71#define _PAGE_EXT_KERN_READ 0x2000 /* EPR5-bit: Kernel space readable */
72
73/* Wrapper for extended mode pgprot twiddling */
74#define _PAGE_EXT(x) ((unsigned long long)(x) << 32)
75
76/* software: moves to PTEA.TC (Timing Control) */
77#define _PAGE_PCC_AREA5 0x00000000 /* use BSC registers for area5 */
78#define _PAGE_PCC_AREA6 0x80000000 /* use BSC registers for area6 */
79
80/* software: moves to PTEA.SA[2:0] (Space Attributes) */
81#define _PAGE_PCC_IODYN 0x00000001 /* IO space, dynamically sized bus */
82#define _PAGE_PCC_IO8 0x20000000 /* IO space, 8 bit bus */
83#define _PAGE_PCC_IO16 0x20000001 /* IO space, 16 bit bus */
84#define _PAGE_PCC_COM8 0x40000000 /* Common Memory space, 8 bit bus */
85#define _PAGE_PCC_COM16 0x40000001 /* Common Memory space, 16 bit bus */
86#define _PAGE_PCC_ATR8 0x60000000 /* Attribute Memory space, 8 bit bus */
87#define _PAGE_PCC_ATR16 0x60000001 /* Attribute Memory space, 6 bit bus */
88
89/* Mask which drops unused bits from the PTEL value */
90#if defined(CONFIG_CPU_SH3)
91#define _PAGE_CLEAR_FLAGS (_PAGE_PROTNONE | _PAGE_ACCESSED| \
92 _PAGE_FILE | _PAGE_SZ1 | \
93 _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_FILE | _PAGE_PR_MASK | _PAGE_SZ_MASK)
98#else
99#define _PAGE_CLEAR_FLAGS (_PAGE_PROTNONE | _PAGE_ACCESSED | _PAGE_FILE)
100#endif
101
Stuart Menefyd02b08f2007-11-30 17:52:53 +0900102#define _PAGE_FLAGS_HARDWARE_MASK (PHYS_ADDR_MASK & ~(_PAGE_CLEAR_FLAGS))
Paul Mundt249cfea2007-11-19 18:26:19 +0900103
104/* Hardware flags, page size encoding */
105#if 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
121#if defined(CONFIG_X2TLB)
122# if defined(CONFIG_HUGETLB_PAGE_SIZE_64K)
123# define _PAGE_SZHUGE (_PAGE_EXT_ESZ2)
124# elif defined(CONFIG_HUGETLB_PAGE_SIZE_256K)
125# define _PAGE_SZHUGE (_PAGE_EXT_ESZ0 | _PAGE_EXT_ESZ2)
126# elif defined(CONFIG_HUGETLB_PAGE_SIZE_1MB)
127# define _PAGE_SZHUGE (_PAGE_EXT_ESZ0 | _PAGE_EXT_ESZ1 | _PAGE_EXT_ESZ2)
128# elif defined(CONFIG_HUGETLB_PAGE_SIZE_4MB)
129# define _PAGE_SZHUGE (_PAGE_EXT_ESZ3)
130# elif defined(CONFIG_HUGETLB_PAGE_SIZE_64MB)
131# define _PAGE_SZHUGE (_PAGE_EXT_ESZ2 | _PAGE_EXT_ESZ3)
132# endif
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#endif
140
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#define _PAGE_CHG_MASK \
150 (PTE_MASK | _PAGE_ACCESSED | _PAGE_CACHABLE | _PAGE_DIRTY)
151
152#ifndef __ASSEMBLY__
153
154#if defined(CONFIG_X2TLB) /* SH-X2 TLB */
155#define PAGE_NONE __pgprot(_PAGE_PROTNONE | _PAGE_CACHABLE | \
156 _PAGE_ACCESSED | _PAGE_FLAGS_HARD)
157
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
165#define PAGE_EXECREAD __pgprot(_PAGE_PRESENT | _PAGE_ACCESSED | \
166 _PAGE_CACHABLE | _PAGE_FLAGS_HARD | \
167 _PAGE_EXT(_PAGE_EXT_KERN_EXEC | \
168 _PAGE_EXT_KERN_READ | \
169 _PAGE_EXT_USER_EXEC | \
170 _PAGE_EXT_USER_READ))
171
172#define PAGE_COPY PAGE_EXECREAD
173
174#define PAGE_READONLY __pgprot(_PAGE_PRESENT | _PAGE_ACCESSED | \
175 _PAGE_CACHABLE | _PAGE_FLAGS_HARD | \
176 _PAGE_EXT(_PAGE_EXT_KERN_READ | \
177 _PAGE_EXT_USER_READ))
178
179#define PAGE_WRITEONLY __pgprot(_PAGE_PRESENT | _PAGE_ACCESSED | \
180 _PAGE_CACHABLE | _PAGE_FLAGS_HARD | \
181 _PAGE_EXT(_PAGE_EXT_KERN_WRITE | \
182 _PAGE_EXT_USER_WRITE))
183
184#define PAGE_RWX __pgprot(_PAGE_PRESENT | _PAGE_ACCESSED | \
185 _PAGE_CACHABLE | _PAGE_FLAGS_HARD | \
186 _PAGE_EXT(_PAGE_EXT_KERN_WRITE | \
187 _PAGE_EXT_KERN_READ | \
188 _PAGE_EXT_KERN_EXEC | \
189 _PAGE_EXT_USER_WRITE | \
190 _PAGE_EXT_USER_READ | \
191 _PAGE_EXT_USER_EXEC))
192
193#define PAGE_KERNEL __pgprot(_PAGE_PRESENT | _PAGE_CACHABLE | \
194 _PAGE_DIRTY | _PAGE_ACCESSED | \
195 _PAGE_HW_SHARED | _PAGE_FLAGS_HARD | \
196 _PAGE_EXT(_PAGE_EXT_KERN_READ | \
197 _PAGE_EXT_KERN_WRITE | \
198 _PAGE_EXT_KERN_EXEC))
199
200#define PAGE_KERNEL_NOCACHE \
201 __pgprot(_PAGE_PRESENT | _PAGE_DIRTY | \
202 _PAGE_ACCESSED | _PAGE_HW_SHARED | \
203 _PAGE_FLAGS_HARD | \
204 _PAGE_EXT(_PAGE_EXT_KERN_READ | \
205 _PAGE_EXT_KERN_WRITE | \
206 _PAGE_EXT_KERN_EXEC))
207
208#define PAGE_KERNEL_RO __pgprot(_PAGE_PRESENT | _PAGE_CACHABLE | \
209 _PAGE_DIRTY | _PAGE_ACCESSED | \
210 _PAGE_HW_SHARED | _PAGE_FLAGS_HARD | \
211 _PAGE_EXT(_PAGE_EXT_KERN_READ | \
212 _PAGE_EXT_KERN_EXEC))
213
214#define PAGE_KERNEL_PCC(slot, type) \
215 __pgprot(_PAGE_PRESENT | _PAGE_DIRTY | \
216 _PAGE_ACCESSED | _PAGE_FLAGS_HARD | \
217 _PAGE_EXT(_PAGE_EXT_KERN_READ | \
218 _PAGE_EXT_KERN_WRITE | \
219 _PAGE_EXT_KERN_EXEC) \
220 (slot ? _PAGE_PCC_AREA5 : _PAGE_PCC_AREA6) | \
221 (type))
222
223#elif defined(CONFIG_MMU) /* SH-X TLB */
224#define PAGE_NONE __pgprot(_PAGE_PROTNONE | _PAGE_CACHABLE | \
225 _PAGE_ACCESSED | _PAGE_FLAGS_HARD)
226
227#define PAGE_SHARED __pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_USER | \
228 _PAGE_CACHABLE | _PAGE_ACCESSED | \
229 _PAGE_FLAGS_HARD)
230
231#define PAGE_COPY __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_CACHABLE | \
232 _PAGE_ACCESSED | _PAGE_FLAGS_HARD)
233
234#define PAGE_READONLY __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_CACHABLE | \
235 _PAGE_ACCESSED | _PAGE_FLAGS_HARD)
236
237#define PAGE_EXECREAD PAGE_READONLY
238#define PAGE_RWX PAGE_SHARED
239#define PAGE_WRITEONLY PAGE_SHARED
240
241#define PAGE_KERNEL __pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_CACHABLE | \
242 _PAGE_DIRTY | _PAGE_ACCESSED | \
243 _PAGE_HW_SHARED | _PAGE_FLAGS_HARD)
244
245#define PAGE_KERNEL_NOCACHE \
246 __pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_DIRTY | \
247 _PAGE_ACCESSED | _PAGE_HW_SHARED | \
248 _PAGE_FLAGS_HARD)
249
250#define PAGE_KERNEL_RO __pgprot(_PAGE_PRESENT | _PAGE_CACHABLE | \
251 _PAGE_DIRTY | _PAGE_ACCESSED | \
252 _PAGE_HW_SHARED | _PAGE_FLAGS_HARD)
253
254#define PAGE_KERNEL_PCC(slot, type) \
255 __pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_DIRTY | \
256 _PAGE_ACCESSED | _PAGE_FLAGS_HARD | \
257 (slot ? _PAGE_PCC_AREA5 : _PAGE_PCC_AREA6) | \
258 (type))
259#else /* no mmu */
260#define PAGE_NONE __pgprot(0)
261#define PAGE_SHARED __pgprot(0)
262#define PAGE_COPY __pgprot(0)
263#define PAGE_EXECREAD __pgprot(0)
264#define PAGE_RWX __pgprot(0)
265#define PAGE_READONLY __pgprot(0)
266#define PAGE_WRITEONLY __pgprot(0)
267#define PAGE_KERNEL __pgprot(0)
268#define PAGE_KERNEL_NOCACHE __pgprot(0)
269#define PAGE_KERNEL_RO __pgprot(0)
270
271#define PAGE_KERNEL_PCC(slot, type) \
272 __pgprot(0)
273#endif
274
275#endif /* __ASSEMBLY__ */
276
277#ifndef __ASSEMBLY__
278
279/*
280 * Certain architectures need to do special things when PTEs
281 * within a page table are directly modified. Thus, the following
282 * hook is made available.
283 */
284#ifdef CONFIG_X2TLB
285static inline void set_pte(pte_t *ptep, pte_t pte)
286{
287 ptep->pte_high = pte.pte_high;
288 smp_wmb();
289 ptep->pte_low = pte.pte_low;
290}
291#else
292#define set_pte(pteptr, pteval) (*(pteptr) = pteval)
293#endif
294
295#define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval)
296
297/*
298 * (pmds are folded into pgds so this doesn't get actually called,
299 * but the define is needed for a generic inline function.)
300 */
301#define set_pmd(pmdptr, pmdval) (*(pmdptr) = pmdval)
302
303#define pfn_pte(pfn, prot) \
304 __pte(((unsigned long long)(pfn) << PAGE_SHIFT) | pgprot_val(prot))
305#define pfn_pmd(pfn, prot) \
306 __pmd(((unsigned long long)(pfn) << PAGE_SHIFT) | pgprot_val(prot))
307
308#define pte_none(x) (!pte_val(x))
309#define pte_present(x) ((x).pte_low & (_PAGE_PRESENT | _PAGE_PROTNONE))
310
311#define pte_clear(mm,addr,xp) do { set_pte_at(mm, addr, xp, __pte(0)); } while (0)
312
313#define pmd_none(x) (!pmd_val(x))
314#define pmd_present(x) (pmd_val(x))
315#define pmd_clear(xp) do { set_pmd(xp, __pmd(0)); } while (0)
316#define pmd_bad(x) (pmd_val(x) & ~PAGE_MASK)
317
318#define pages_to_mb(x) ((x) >> (20-PAGE_SHIFT))
319#define pte_page(x) pfn_to_page(pte_pfn(x))
320
321/*
322 * The following only work if pte_present() is true.
323 * Undefined behaviour if not..
324 */
325#define pte_not_present(pte) (!((pte).pte_low & _PAGE_PRESENT))
326#define pte_dirty(pte) ((pte).pte_low & _PAGE_DIRTY)
327#define pte_young(pte) ((pte).pte_low & _PAGE_ACCESSED)
328#define pte_file(pte) ((pte).pte_low & _PAGE_FILE)
Nick Piggin7e675132008-04-28 02:13:00 -0700329#define pte_special(pte) (0)
Paul Mundt249cfea2007-11-19 18:26:19 +0900330
331#ifdef CONFIG_X2TLB
332#define pte_write(pte) ((pte).pte_high & _PAGE_EXT_USER_WRITE)
333#else
334#define pte_write(pte) ((pte).pte_low & _PAGE_RW)
335#endif
336
337#define PTE_BIT_FUNC(h,fn,op) \
338static inline pte_t pte_##fn(pte_t pte) { pte.pte_##h op; return pte; }
339
340#ifdef CONFIG_X2TLB
341/*
342 * We cheat a bit in the SH-X2 TLB case. As the permission bits are
343 * individually toggled (and user permissions are entirely decoupled from
344 * kernel permissions), we attempt to couple them a bit more sanely here.
345 */
346PTE_BIT_FUNC(high, wrprotect, &= ~_PAGE_EXT_USER_WRITE);
347PTE_BIT_FUNC(high, mkwrite, |= _PAGE_EXT_USER_WRITE | _PAGE_EXT_KERN_WRITE);
348PTE_BIT_FUNC(high, mkhuge, |= _PAGE_SZHUGE);
349#else
350PTE_BIT_FUNC(low, wrprotect, &= ~_PAGE_RW);
351PTE_BIT_FUNC(low, mkwrite, |= _PAGE_RW);
352PTE_BIT_FUNC(low, mkhuge, |= _PAGE_SZHUGE);
353#endif
354
355PTE_BIT_FUNC(low, mkclean, &= ~_PAGE_DIRTY);
356PTE_BIT_FUNC(low, mkdirty, |= _PAGE_DIRTY);
357PTE_BIT_FUNC(low, mkold, &= ~_PAGE_ACCESSED);
358PTE_BIT_FUNC(low, mkyoung, |= _PAGE_ACCESSED);
359
Nick Piggin7e675132008-04-28 02:13:00 -0700360static inline pte_t pte_mkspecial(pte_t pte) { return pte; }
361
Paul Mundt249cfea2007-11-19 18:26:19 +0900362/*
363 * Macro and implementation to make a page protection as uncachable.
364 */
365#define pgprot_writecombine(prot) \
366 __pgprot(pgprot_val(prot) & ~_PAGE_CACHABLE)
367
368#define pgprot_noncached pgprot_writecombine
369
370/*
371 * Conversion functions: convert a page and protection to a page entry,
372 * and a page entry and page directory to the page they refer to.
373 *
374 * extern pte_t mk_pte(struct page *page, pgprot_t pgprot)
375 */
376#define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot))
377
378static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
379{
380 pte.pte_low &= _PAGE_CHG_MASK;
381 pte.pte_low |= pgprot_val(newprot);
382
383#ifdef CONFIG_X2TLB
384 pte.pte_high |= pgprot_val(newprot) >> 32;
385#endif
386
387 return pte;
388}
389
390#define pmd_page_vaddr(pmd) ((unsigned long)pmd_val(pmd))
391#define pmd_page(pmd) (virt_to_page(pmd_val(pmd)))
392
393/* to find an entry in a page-table-directory. */
394#define pgd_index(address) (((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD-1))
395#define pgd_offset(mm, address) ((mm)->pgd+pgd_index(address))
396
397/* to find an entry in a kernel page-table-directory */
398#define pgd_offset_k(address) pgd_offset(&init_mm, address)
399
400/* Find an entry in the third-level page table.. */
401#define pte_index(address) ((address >> PAGE_SHIFT) & (PTRS_PER_PTE - 1))
402#define pte_offset_kernel(dir, address) \
403 ((pte_t *) pmd_page_vaddr(*(dir)) + pte_index(address))
404#define pte_offset_map(dir, address) pte_offset_kernel(dir, address)
405#define pte_offset_map_nested(dir, address) pte_offset_kernel(dir, address)
406
407#define pte_unmap(pte) do { } while (0)
408#define pte_unmap_nested(pte) do { } while (0)
409
410#ifdef CONFIG_X2TLB
411#define pte_ERROR(e) \
412 printk("%s:%d: bad pte %p(%08lx%08lx).\n", __FILE__, __LINE__, \
413 &(e), (e).pte_high, (e).pte_low)
414#define pgd_ERROR(e) \
415 printk("%s:%d: bad pgd %016llx.\n", __FILE__, __LINE__, pgd_val(e))
416#else
417#define pte_ERROR(e) \
418 printk("%s:%d: bad pte %08lx.\n", __FILE__, __LINE__, pte_val(e))
419#define pgd_ERROR(e) \
420 printk("%s:%d: bad pgd %08lx.\n", __FILE__, __LINE__, pgd_val(e))
421#endif
422
423/*
424 * Encode and de-code a swap entry
425 *
426 * Constraints:
427 * _PAGE_FILE at bit 0
428 * _PAGE_PRESENT at bit 8
429 * _PAGE_PROTNONE at bit 9
430 *
431 * For the normal case, we encode the swap type into bits 0:7 and the
432 * swap offset into bits 10:30. For the 64-bit PTE case, we keep the
433 * preserved bits in the low 32-bits and use the upper 32 as the swap
434 * offset (along with a 5-bit type), following the same approach as x86
435 * PAE. This keeps the logic quite simple, and allows for a full 32
436 * PTE_FILE_MAX_BITS, as opposed to the 29-bits we're constrained with
437 * in the pte_low case.
438 *
439 * As is evident by the Alpha code, if we ever get a 64-bit unsigned
440 * long (swp_entry_t) to match up with the 64-bit PTEs, this all becomes
441 * much cleaner..
442 *
443 * NOTE: We should set ZEROs at the position of _PAGE_PRESENT
444 * and _PAGE_PROTNONE bits
445 */
446#ifdef CONFIG_X2TLB
447#define __swp_type(x) ((x).val & 0x1f)
448#define __swp_offset(x) ((x).val >> 5)
449#define __swp_entry(type, offset) ((swp_entry_t){ (type) | (offset) << 5})
450#define __pte_to_swp_entry(pte) ((swp_entry_t){ (pte).pte_high })
451#define __swp_entry_to_pte(x) ((pte_t){ 0, (x).val })
452
453/*
454 * Encode and decode a nonlinear file mapping entry
455 */
456#define pte_to_pgoff(pte) ((pte).pte_high)
457#define pgoff_to_pte(off) ((pte_t) { _PAGE_FILE, (off) })
458
459#define PTE_FILE_MAX_BITS 32
460#else
461#define __swp_type(x) ((x).val & 0xff)
462#define __swp_offset(x) ((x).val >> 10)
463#define __swp_entry(type, offset) ((swp_entry_t){(type) | (offset) <<10})
464
465#define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) >> 1 })
466#define __swp_entry_to_pte(x) ((pte_t) { (x).val << 1 })
467
468/*
469 * Encode and decode a nonlinear file mapping entry
470 */
471#define PTE_FILE_MAX_BITS 29
472#define pte_to_pgoff(pte) (pte_val(pte) >> 1)
473#define pgoff_to_pte(off) ((pte_t) { ((off) << 1) | _PAGE_FILE })
474#endif
475
476#endif /* __ASSEMBLY__ */
477#endif /* __ASM_SH_PGTABLE_32_H */