summaryrefslogtreecommitdiffstats
path: root/include/asm-sh64/pgtable.h
blob: 78ac6be2d9ef0ebe6de29d7e4f8a5a7be3e91e34 (plain)
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
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
#ifndef __ASM_SH64_PGTABLE_H
#define __ASM_SH64_PGTABLE_H

#include <asm-generic/4level-fixup.h>

/*
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 *
 * include/asm-sh64/pgtable.h
 *
 * Copyright (C) 2000, 2001  Paolo Alberelli
 * Copyright (C) 2003, 2004  Paul Mundt
 * Copyright (C) 2003, 2004  Richard Curnow
 *
 * This file contains the functions and defines necessary to modify and use
 * the SuperH page table tree.
 */

#ifndef __ASSEMBLY__
#include <asm/processor.h>
#include <asm/page.h>
#include <linux/threads.h>
#include <linux/config.h>

extern void paging_init(void);

/* We provide our own get_unmapped_area to avoid cache synonym issue */
#define HAVE_ARCH_UNMAPPED_AREA

/*
 * Basically we have the same two-level (which is the logical three level
 * Linux page table layout folded) page tables as the i386.
 */

/*
 * ZERO_PAGE is a global shared page that is always zero: used
 * for zero-mapped memory areas etc..
 */
extern unsigned char empty_zero_page[PAGE_SIZE];
#define ZERO_PAGE(vaddr) (mem_map + MAP_NR(empty_zero_page))

#endif /* !__ASSEMBLY__ */

/*
 * NEFF and NPHYS related defines.
 * FIXME : These need to be model-dependent.  For now this is OK, SH5-101 and SH5-103
 * implement 32 bits effective and 32 bits physical.  But future implementations may
 * extend beyond this.
 */
#define NEFF		32
#define	NEFF_SIGN	(1LL << (NEFF - 1))
#define	NEFF_MASK	(-1LL << NEFF)

#define NPHYS		32
#define	NPHYS_SIGN	(1LL << (NPHYS - 1))
#define	NPHYS_MASK	(-1LL << NPHYS)

/* Typically 2-level is sufficient up to 32 bits of virtual address space, beyond
   that 3-level would be appropriate. */
#if defined(CONFIG_SH64_PGTABLE_2_LEVEL)
/* For 4k pages, this contains 512 entries, i.e. 9 bits worth of address. */
#define PTRS_PER_PTE	((1<<PAGE_SHIFT)/sizeof(unsigned long long))
#define PTE_MAGNITUDE	3	      /* sizeof(unsigned long long) magnit. */
#define PTE_SHIFT	PAGE_SHIFT
#define PTE_BITS	(PAGE_SHIFT - PTE_MAGNITUDE)

/* top level: PMD. */
#define PGDIR_SHIFT	(PTE_SHIFT + PTE_BITS)
#define PGD_BITS	(NEFF - PGDIR_SHIFT)
#define PTRS_PER_PGD	(1<<PGD_BITS)

/* middle level: PMD. This doesn't do anything for the 2-level case. */
#define PTRS_PER_PMD	(1)

#define PGDIR_SIZE	(1UL << PGDIR_SHIFT)
#define PGDIR_MASK	(~(PGDIR_SIZE-1))
#define PMD_SHIFT	PGDIR_SHIFT
#define PMD_SIZE	PGDIR_SIZE
#define PMD_MASK	PGDIR_MASK

#elif defined(CONFIG_SH64_PGTABLE_3_LEVEL)
/*
 * three-level asymmetric paging structure: PGD is top level.
 * The asymmetry comes from 32-bit pointers and 64-bit PTEs.
 */
/* bottom level: PTE. It's 9 bits = 512 pointers */
#define PTRS_PER_PTE	((1<<PAGE_SHIFT)/sizeof(unsigned long long))
#define PTE_MAGNITUDE	3	      /* sizeof(unsigned long long) magnit. */
#define PTE_SHIFT	PAGE_SHIFT
#define PTE_BITS	(PAGE_SHIFT - PTE_MAGNITUDE)

/* middle level: PMD. It's 10 bits = 1024 pointers */
#define PTRS_PER_PMD	((1<<PAGE_SHIFT)/sizeof(unsigned long long *))
#define PMD_MAGNITUDE	2	      /* sizeof(unsigned long long *) magnit. */
#define PMD_SHIFT	(PTE_SHIFT + PTE_BITS)
#define PMD_BITS	(PAGE_SHIFT - PMD_MAGNITUDE)

/* top level: PMD. It's 1 bit = 2 pointers */
#define PGDIR_SHIFT	(PMD_SHIFT + PMD_BITS)
#define PGD_BITS	(NEFF - PGDIR_SHIFT)
#define PTRS_PER_PGD	(1<<PGD_BITS)

#define PMD_SIZE	(1UL << PMD_SHIFT)
#define PMD_MASK	(~(PMD_SIZE-1))
#define PGDIR_SIZE	(1UL << PGDIR_SHIFT)
#define PGDIR_MASK	(~(PGDIR_SIZE-1))

#else
#error "No defined number of page table levels"
#endif

/*
 * Error outputs.
 */
#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 %08lx.\n", __FILE__, __LINE__, pmd_val(e))
#define pgd_ERROR(e) \
	printk("%s:%d: bad pgd %08lx.\n", __FILE__, __LINE__, pgd_val(e))

/*
 * Table setting routines. Used within arch/mm only.
 */
#define set_pgd(pgdptr, pgdval) (*(pgdptr) = pgdval)
#define set_pmd(pmdptr, pmdval) (*(pmdptr) = pmdval)

static __inline__ void set_pte(pte_t *pteptr, pte_t pteval)
{
	unsigned long long x = ((unsigned long long) pteval.pte);
	unsigned long long *xp = (unsigned long long *) pteptr;
	/*
	 * Sign-extend based on NPHYS.
	 */
	*(xp) = (x & NPHYS_SIGN) ? (x | NPHYS_MASK) : x;
}
#define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval)

static __inline__ void pmd_set(pmd_t *pmdp,pte_t *ptep)
{
	pmd_val(*pmdp) = (unsigned long) ptep;
}

/*
 * PGD defines. Top level.
 */

/* To find an entry in a generic PGD. */
#define pgd_index(address) (((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD-1))
#define __pgd_offset(address) pgd_index(address)
#define pgd_offset(mm, address) ((mm)->pgd+pgd_index(address))

/* To find an entry in a kernel PGD. */
#define pgd_offset_k(address) pgd_offset(&init_mm, address)

/*
 * PGD level access routines.
 *
 * Note1:
 * There's no need to use physical addresses since the tree walk is all
 * in performed in software, until the PTE translation.
 *
 * Note 2:
 * A PGD entry can be uninitialized (_PGD_UNUSED), generically bad,
 * clear (_PGD_EMPTY), present. When present, lower 3 nibbles contain
 * _KERNPG_TABLE. Being a kernel virtual pointer also bit 31 must
 * be 1. Assuming an arbitrary clear value of bit 31 set to 0 and
 * lower 3 nibbles set to 0xFFF (_PGD_EMPTY) any other value is a
 * bad pgd that must be notified via printk().
 *
 */
#define _PGD_EMPTY		0x0

#if defined(CONFIG_SH64_PGTABLE_2_LEVEL)
static inline int pgd_none(pgd_t pgd)		{ return 0; }
static inline int pgd_bad(pgd_t pgd)		{ return 0; }
#define pgd_present(pgd) ((pgd_val(pgd) & _PAGE_PRESENT) ? 1 : 0)
#define pgd_clear(xx)				do { } while(0)

#elif defined(CONFIG_SH64_PGTABLE_3_LEVEL)
#define pgd_present(pgd_entry)	(1)
#define pgd_none(pgd_entry)	(pgd_val((pgd_entry)) == _PGD_EMPTY)
/* TODO: Think later about what a useful definition of 'bad' would be now. */
#define pgd_bad(pgd_entry)	(0)
#define pgd_clear(pgd_entry_p)	(set_pgd((pgd_entry_p), __pgd(_PGD_EMPTY)))

#endif


#define pgd_page(pgd_entry)	((unsigned long) (pgd_val(pgd_entry) & PAGE_MASK))

/*
 * PMD defines. Middle level.
 */

/* PGD to PMD dereferencing */
#if defined(CONFIG_SH64_PGTABLE_2_LEVEL)
static inline pmd_t * pmd_offset(pgd_t * dir, unsigned long address)
{
	return (pmd_t *) dir;
}
#elif defined(CONFIG_SH64_PGTABLE_3_LEVEL)
#define __pmd_offset(address) \
		(((address) >> PMD_SHIFT) & (PTRS_PER_PMD-1))
#define pmd_offset(dir, addr) \
		((pmd_t *) ((pgd_val(*(dir))) & PAGE_MASK) + __pmd_offset((addr)))
#endif

/*
 * PMD level access routines. Same notes as above.
 */
#define _PMD_EMPTY		0x0
/* Either the PMD is empty or present, it's not paged out */
#define pmd_present(pmd_entry)	(pmd_val(pmd_entry) & _PAGE_PRESENT)
#define pmd_clear(pmd_entry_p)	(set_pmd((pmd_entry_p), __pmd(_PMD_EMPTY)))
#define pmd_none(pmd_entry)	(pmd_val((pmd_entry)) == _PMD_EMPTY)
#define pmd_bad(pmd_entry)	((pmd_val(pmd_entry) & (~PAGE_MASK & ~_PAGE_USER)) != _KERNPG_TABLE)

#define pmd_page_kernel(pmd_entry) \
	((unsigned long) __va(pmd_val(pmd_entry) & PAGE_MASK))

#define pmd_page(pmd) \
	(virt_to_page(pmd_val(pmd)))

/* PMD to PTE dereferencing */
#define pte_index(address) \
		((address >> PAGE_SHIFT) & (PTRS_PER_PTE - 1))

#define pte_offset_kernel(dir, addr) \
		((pte_t *) ((pmd_val(*(dir))) & PAGE_MASK) + pte_index((addr)))

#define pte_offset_map(dir,addr)	pte_offset_kernel(dir, addr)
#define pte_offset_map_nested(dir,addr)	pte_offset_kernel(dir, addr)
#define pte_unmap(pte)		do { } while (0)
#define pte_unmap_nested(pte)	do { } while (0)

/* Round it up ! */
#define USER_PTRS_PER_PGD	((TASK_SIZE+PGDIR_SIZE-1)/PGDIR_SIZE)
#define FIRST_USER_ADDRESS	0

#ifndef __ASSEMBLY__
#define VMALLOC_END	0xff000000
#define VMALLOC_START	0xf0000000
#define VMALLOC_VMADDR(x) ((unsigned long)(x))

#define IOBASE_VADDR	0xff000000
#define IOBASE_END	0xffffffff

/*
 * PTEL coherent flags.
 * See Chapter 17 ST50 CPU Core Volume 1, Architecture.
 */
/* The bits that are required in the SH-5 TLB are placed in the h/w-defined
   positions, to avoid expensive bit shuffling on every refill.  The remaining
   bits are used for s/w purposes and masked out on each refill.

   Note, the PTE slots are used to hold data of type swp_entry_t when a page is
   swapped out.  Only the _PAGE_PRESENT flag is significant when the page is
   swapped out, and it must be placed so that it doesn't overlap either the
   type or offset fields of swp_entry_t.  For x86, offset is at [31:8] and type
   at [6:1], with _PAGE_PRESENT at bit 0 for both pte_t and swp_entry_t.  This
   scheme doesn't map to SH-5 because bit [0] controls cacheability.  So bit
   [2] is used for _PAGE_PRESENT and the type field of swp_entry_t is split
   into 2 pieces.  That is handled by SWP_ENTRY and SWP_TYPE below. */
#define _PAGE_WT	0x001  /* CB0: if cacheable, 1->write-thru, 0->write-back */
#define _PAGE_DEVICE	0x001  /* CB0: if uncacheable, 1->device (i.e. no write-combining or reordering at bus level) */
#define _PAGE_CACHABLE	0x002  /* CB1: uncachable/cachable */
#define _PAGE_PRESENT	0x004  /* software: page referenced */
#define _PAGE_FILE	0x004  /* software: only when !present */
#define _PAGE_SIZE0	0x008  /* SZ0-bit : size of page */
#define _PAGE_SIZE1	0x010  /* SZ1-bit : size of page */
#define _PAGE_SHARED	0x020  /* software: reflects PTEH's SH */
#define _PAGE_READ	0x040  /* PR0-bit : read access allowed */
#define _PAGE_EXECUTE	0x080  /* PR1-bit : execute access allowed */
#define _PAGE_WRITE	0x100  /* PR2-bit : write access allowed */
#define _PAGE_USER	0x200  /* PR3-bit : user space access allowed */
#define _PAGE_DIRTY	0x400  /* software: page accessed in write */
#define _PAGE_ACCESSED	0x800  /* software: page referenced */

/* Mask which drops software flags */
#define _PAGE_FLAGS_HARDWARE_MASK	0xfffffffffffff3dbLL

/*
 * HugeTLB support
 */
#if defined(CONFIG_HUGETLB_PAGE_SIZE_64K)
#define _PAGE_SZHUGE	(_PAGE_SIZE0)
#elif defined(CONFIG_HUGETLB_PAGE_SIZE_1MB)
#define _PAGE_SZHUGE	(_PAGE_SIZE1)
#elif defined(CONFIG_HUGETLB_PAGE_SIZE_512MB)
#define _PAGE_SZHUGE	(_PAGE_SIZE0 | _PAGE_SIZE1)
#endif

/*
 * Default flags for a Kernel page.
 * This is fundametally also SHARED because the main use of this define
 * (other than for PGD/PMD entries) is for the VMALLOC pool which is
 * contextless.
 *
 * _PAGE_EXECUTE is required for modules
 *
 */
#define _KERNPG_TABLE	(_PAGE_PRESENT | _PAGE_READ | _PAGE_WRITE | \
			 _PAGE_EXECUTE | \
			 _PAGE_CACHABLE | _PAGE_ACCESSED | _PAGE_DIRTY | \
			 _PAGE_SHARED)

/* Default flags for a User page */
#define _PAGE_TABLE	(_KERNPG_TABLE | _PAGE_USER)

#define _PAGE_CHG_MASK	(PTE_MASK | _PAGE_ACCESSED | _PAGE_DIRTY)

#define PAGE_NONE	__pgprot(_PAGE_CACHABLE | _PAGE_ACCESSED)
#define PAGE_SHARED	__pgprot(_PAGE_PRESENT | _PAGE_READ | _PAGE_WRITE | \
				 _PAGE_CACHABLE | _PAGE_ACCESSED | _PAGE_USER | \
				 _PAGE_SHARED)
/* We need to include PAGE_EXECUTE in PAGE_COPY because it is the default
 * protection mode for the stack. */
#define PAGE_COPY	__pgprot(_PAGE_PRESENT | _PAGE_READ | _PAGE_CACHABLE | \
				 _PAGE_ACCESSED | _PAGE_USER | _PAGE_EXECUTE)
#define PAGE_READONLY	__pgprot(_PAGE_PRESENT | _PAGE_READ | _PAGE_CACHABLE | \
				 _PAGE_ACCESSED | _PAGE_USER)
#define PAGE_KERNEL	__pgprot(_KERNPG_TABLE)


/*
 * In ST50 we have full permissions (Read/Write/Execute/Shared).
 * Just match'em all. These are for mmap(), therefore all at least
 * User/Cachable/Present/Accessed. No point in making Fault on Write.
 */
#define __MMAP_COMMON	(_PAGE_PRESENT | _PAGE_USER | _PAGE_CACHABLE | _PAGE_ACCESSED)
       /* sxwr */
#define __P000	__pgprot(__MMAP_COMMON)
#define __P001	__pgprot(__MMAP_COMMON | _PAGE_READ)
#define __P010	__pgprot(__MMAP_COMMON)
#define __P011	__pgprot(__MMAP_COMMON | _PAGE_READ)
#define __P100	__pgprot(__MMAP_COMMON | _PAGE_EXECUTE)
#define __P101	__pgprot(__MMAP_COMMON | _PAGE_EXECUTE | _PAGE_READ)
#define __P110	__pgprot(__MMAP_COMMON | _PAGE_EXECUTE)
#define __P111	__pgprot(__MMAP_COMMON | _PAGE_EXECUTE | _PAGE_READ)

#define __S000	__pgprot(__MMAP_COMMON | _PAGE_SHARED)
#define __S001	__pgprot(__MMAP_COMMON | _PAGE_SHARED | _PAGE_READ)
#define __S010	__pgprot(__MMAP_COMMON | _PAGE_SHARED | _PAGE_WRITE)
#define __S011	__pgprot(__MMAP_COMMON | _PAGE_SHARED | _PAGE_READ | _PAGE_WRITE)
#define __S100	__pgprot(__MMAP_COMMON | _PAGE_SHARED | _PAGE_EXECUTE)
#define __S101	__pgprot(__MMAP_COMMON | _PAGE_SHARED | _PAGE_EXECUTE | _PAGE_READ)
#define __S110	__pgprot(__MMAP_COMMON | _PAGE_SHARED | _PAGE_EXECUTE | _PAGE_WRITE)
#define __S111	__pgprot(__MMAP_COMMON | _PAGE_SHARED | _PAGE_EXECUTE | _PAGE_READ | _PAGE_WRITE)

/* Make it a device mapping for maximum safety (e.g. for mapping device
   registers into user-space via /dev/map).  */
#define pgprot_noncached(x) __pgprot(((x).pgprot & ~(_PAGE_CACHABLE)) | _PAGE_DEVICE)
#define pgprot_writecombine(prot) __pgprot(pgprot_val(prot) & ~_PAGE_CACHABLE)

/*
 * Handling allocation failures during page table setup.
 */
extern void __handle_bad_pmd_kernel(pmd_t * pmd);
#define __handle_bad_pmd(x)	__handle_bad_pmd_kernel(x)

/*
 * PTE level access routines.
 *
 * Note1:
 * It's the tree walk leaf. This is physical address to be stored.
 *
 * Note 2:
 * Regarding the choice of _PTE_EMPTY:

   We must choose a bit pattern that cannot be valid, whether or not the page
   is present.  bit[2]==1 => present, bit[2]==0 => swapped out.  If swapped
   out, bits [31:8], [6:3], [1:0] are under swapper control, so only bit[7] is
   left for us to select.  If we force bit[7]==0 when swapped out, we could use
   the combination bit[7,2]=2'b10 to indicate an empty PTE.  Alternatively, if
   we force bit[7]==1 when swapped out, we can use all zeroes to indicate
   empty.  This is convenient, because the page tables get cleared to zero
   when they are allocated.

 */
#define _PTE_EMPTY	0x0
#define pte_present(x)	(pte_val(x) & _PAGE_PRESENT)
#define pte_clear(mm,addr,xp)	(set_pte_at(mm, addr, xp, __pte(_PTE_EMPTY)))
#define pte_none(x)	(pte_val(x) == _PTE_EMPTY)

/*
 * Some definitions to translate between mem_map, PTEs, and page
 * addresses:
 */

/*
 * Given a PTE, return the index of the mem_map[] entry corresponding
 * to the page frame the PTE. Get the absolute physical address, make
 * a relative physical address and translate it to an index.
 */
#define pte_pagenr(x)		(((unsigned long) (pte_val(x)) - \
				 __MEMORY_START) >> PAGE_SHIFT)

/*
 * Given a PTE, return the "struct page *".
 */
#define pte_page(x)		(mem_map + pte_pagenr(x))

/*
 * Return number of (down rounded) MB corresponding to x pages.
 */
#define pages_to_mb(x) ((x) >> (20-PAGE_SHIFT))


/*
 * The following have defined behavior only work if pte_present() is true.
 */
static inline int pte_read(pte_t pte) { return pte_val(pte) & _PAGE_READ; }
static inline int pte_exec(pte_t pte) { return pte_val(pte) & _PAGE_EXECUTE; }
static inline int pte_dirty(pte_t pte){ return pte_val(pte) & _PAGE_DIRTY; }
static inline int pte_young(pte_t pte){ return pte_val(pte) & _PAGE_ACCESSED; }
static inline int pte_file(pte_t pte) { return pte_val(pte) & _PAGE_FILE; }
static inline int pte_write(pte_t pte){ return pte_val(pte) & _PAGE_WRITE; }

extern inline pte_t pte_rdprotect(pte_t pte)	{ set_pte(&pte, __pte(pte_val(pte) & ~_PAGE_READ)); return pte; }
extern inline pte_t pte_wrprotect(pte_t pte)	{ set_pte(&pte, __pte(pte_val(pte) & ~_PAGE_WRITE)); return pte; }
extern inline pte_t pte_exprotect(pte_t pte)	{ set_pte(&pte, __pte(pte_val(pte) & ~_PAGE_EXECUTE)); return pte; }
extern inline pte_t pte_mkclean(pte_t pte)	{ set_pte(&pte, __pte(pte_val(pte) & ~_PAGE_DIRTY)); return pte; }
extern inline pte_t pte_mkold(pte_t pte)	{ set_pte(&pte, __pte(pte_val(pte) & ~_PAGE_ACCESSED)); return pte; }

extern inline pte_t pte_mkread(pte_t pte)	{ set_pte(&pte, __pte(pte_val(pte) | _PAGE_READ)); return pte; }
extern inline pte_t pte_mkwrite(pte_t pte)	{ set_pte(&pte, __pte(pte_val(pte) | _PAGE_WRITE)); return pte; }
extern inline pte_t pte_mkexec(pte_t pte)	{ set_pte(&pte, __pte(pte_val(pte) | _PAGE_EXECUTE)); return pte; }
extern inline pte_t pte_mkdirty(pte_t pte)	{ set_pte(&pte, __pte(pte_val(pte) | _PAGE_DIRTY)); return pte; }
extern inline pte_t pte_mkyoung(pte_t pte)	{ set_pte(&pte, __pte(pte_val(pte) | _PAGE_ACCESSED)); return pte; }
extern inline pte_t pte_mkhuge(pte_t pte)	{ set_pte(&pte, __pte(pte_val(pte) | _PAGE_SZHUGE)); return pte; }


/*
 * Conversion functions: convert a page and protection to a page entry.
 *
 * extern pte_t mk_pte(struct page *page, pgprot_t pgprot)
 */
#define mk_pte(page,pgprot)							\
({										\
	pte_t __pte;								\
										\
	set_pte(&__pte, __pte((((page)-mem_map) << PAGE_SHIFT) | 		\
		__MEMORY_START | pgprot_val((pgprot))));			\
	__pte;									\
})

/*
 * This takes a (absolute) physical page address that is used
 * by the remapping functions
 */
#define mk_pte_phys(physpage, pgprot) \
({ pte_t __pte; set_pte(&__pte, __pte(physpage | pgprot_val(pgprot))); __pte; })

extern inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
{ set_pte(&pte, __pte((pte_val(pte) & _PAGE_CHG_MASK) | pgprot_val(newprot))); return pte; }

#define page_pte_prot(page, prot) mk_pte(page, prot)
#define page_pte(page) page_pte_prot(page, __pgprot(0))

typedef pte_t *pte_addr_t;
#define pgtable_cache_init()	do { } while (0)

extern void update_mmu_cache(struct vm_area_struct * vma,
			     unsigned long address, pte_t pte);

/* Encode and decode a swap entry */
#define __swp_type(x)			(((x).val & 3) + (((x).val >> 1) & 0x3c))
#define __swp_offset(x)			((x).val >> 8)
#define __swp_entry(type, offset)	((swp_entry_t) { ((offset << 8) + ((type & 0x3c) << 1) + (type & 3)) })
#define __pte_to_swp_entry(pte)		((swp_entry_t) { pte_val(pte) })
#define __swp_entry_to_pte(x)		((pte_t) { (x).val })

/* Encode and decode a nonlinear file mapping entry */
#define PTE_FILE_MAX_BITS		29
#define pte_to_pgoff(pte)		(pte_val(pte))
#define pgoff_to_pte(off)		((pte_t) { (off) | _PAGE_FILE })

/* 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(vma, vaddr, paddr, size, prot)		\
		remap_pfn_range(vma, vaddr, (paddr) >> PAGE_SHIFT, size, prot)

#define io_remap_pfn_range(vma, vaddr, pfn, size, prot)		\
		remap_pfn_range(vma, vaddr, pfn, size, prot)

#define MK_IOSPACE_PFN(space, pfn)	(pfn)
#define GET_IOSPACE(pfn)		0
#define GET_PFN(pfn)			(pfn)

#endif /* !__ASSEMBLY__ */

/*
 * No page table caches to initialise
 */
#define pgtable_cache_init()    do { } while (0)

#define pte_pfn(x)		(((unsigned long)((x).pte)) >> PAGE_SHIFT)
#define pfn_pte(pfn, prot)	__pte(((pfn) << PAGE_SHIFT) | pgprot_val(prot))
#define pfn_pmd(pfn, prot)	__pmd(((pfn) << PAGE_SHIFT) | pgprot_val(prot))

extern pgd_t swapper_pg_dir[PTRS_PER_PGD];

#include <asm-generic/pgtable.h>

#endif /* __ASM_SH64_PGTABLE_H */