aboutsummaryrefslogtreecommitdiffstats
path: root/arch/sh/include/asm/pgtable_64.h
blob: 10a48111226dbd319315105ed48709d6b3189721 (plain) (blame)
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
#ifndef __ASM_SH_PGTABLE_64_H
#define __ASM_SH_PGTABLE_64_H

/*
 * include/asm-sh/pgtable_64.h
 *
 * This file contains the functions and defines necessary to modify and use
 * the SuperH page table tree.
 *
 * Copyright (C) 2000, 2001  Paolo Alberelli
 * Copyright (C) 2003, 2004  Paul Mundt
 * Copyright (C) 2003, 2004  Richard Curnow
 *
 * 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 <linux/threads.h>
#include <asm/processor.h>
#include <asm/page.h>

/*
 * Error outputs.
 */
#define pte_ERROR(e) \
	printk("%s:%d: bad pte %016Lx.\n", __FILE__, __LINE__, pte_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_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_low);
	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)

/*
 * 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)

#define __pud_offset(address)	(((address) >> PUD_SHIFT) & (PTRS_PER_PUD-1))
#define __pmd_offset(address)	(((address) >> PMD_SHIFT) & (PTRS_PER_PMD-1))

/*
 * 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_vaddr(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(address)	pte_index(address)

#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_unmap(pte)		do { } while (0)

#ifndef __ASSEMBLY__
#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 */

/* Wrapper for extended mode pgprot twiddling */
#define _PAGE_EXT(x)		((unsigned long long)(x) << 32)

/*
 * We can use the sign-extended bits in the PTEL to get 32 bits of
 * software flags. This works for now because no implementations uses
 * anything above the PPN field.
 */
#define _PAGE_WIRED	_PAGE_EXT(0x001) /* software: wire the tlb entry */

#define _PAGE_CLEAR_FLAGS	(_PAGE_PRESENT | _PAGE_FILE | _PAGE_SHARED | \
				 _PAGE_DIRTY | _PAGE_ACCESSED | _PAGE_WIRED)

/* Mask which drops software flags */
#define _PAGE_FLAGS_HARDWARE_MASK	(NEFF_MASK & ~(_PAGE_CLEAR_FLAGS))

/*
 * 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

/*
 * Stub out _PAGE_SZHUGE if we don't have a good definition for it,
 * to make pte_mkhuge() happy.
 */
#ifndef _PAGE_SZHUGE
# define _PAGE_SZHUGE	(0)
#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)

/*
 * We have full permissions (Read/Write/Execute/Shared).
 */
#define _PAGE_COMMON	(_PAGE_PRESENT | _PAGE_USER | \
			 _PAGE_CACHABLE | _PAGE_ACCESSED)

#define PAGE_NONE	__pgprot(_PAGE_CACHABLE | _PAGE_ACCESSED)
#define PAGE_SHARED	__pgprot(_PAGE_COMMON | _PAGE_READ | _PAGE_WRITE | \
				 _PAGE_SHARED)
#define PAGE_EXECREAD	__pgprot(_PAGE_COMMON | _PAGE_READ | _PAGE_EXECUTE)

/*
 * We need to include PAGE_EXECUTE in PAGE_COPY because it is the default
 * protection mode for the stack.
 */
#define PAGE_COPY	PAGE_EXECREAD

#define PAGE_READONLY	__pgprot(_PAGE_COMMON | _PAGE_READ)
#define PAGE_WRITEONLY	__pgprot(_PAGE_COMMON | _PAGE_WRITE)
#define PAGE_RWX	__pgprot(_PAGE_COMMON | _PAGE_READ | \
				 _PAGE_WRITE | _PAGE_EXECUTE)
#define PAGE_KERNEL	__pgprot(_KERNPG_TABLE)

#define PAGE_KERNEL_NOCACHE \
			__pgprot(_PAGE_PRESENT | _PAGE_READ | _PAGE_WRITE | \
				 _PAGE_EXECUTE | _PAGE_ACCESSED | \
				 _PAGE_DIRTY | _PAGE_SHARED)

/* 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)

/*
 * 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_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; }
static inline int pte_special(pte_t pte){ return 0; }

static inline pte_t pte_wrprotect(pte_t pte)	{ set_pte(&pte, __pte(pte_val(pte) & ~_PAGE_WRITE)); return pte; }
static inline pte_t pte_mkclean(pte_t pte)	{ set_pte(&pte, __pte(pte_val(pte) & ~_PAGE_DIRTY)); return pte; }
static inline pte_t pte_mkold(pte_t pte)	{ set_pte(&pte, __pte(pte_val(pte) & ~_PAGE_ACCESSED)); return pte; }
static inline pte_t pte_mkwrite(pte_t pte)	{ set_pte(&pte, __pte(pte_val(pte) | _PAGE_WRITE)); return pte; }
static inline pte_t pte_mkdirty(pte_t pte)	{ set_pte(&pte, __pte(pte_val(pte) | _PAGE_DIRTY)); return pte; }
static inline pte_t pte_mkyoung(pte_t pte)	{ set_pte(&pte, __pte(pte_val(pte) | _PAGE_ACCESSED)); return pte; }
static inline pte_t pte_mkhuge(pte_t pte)	{ set_pte(&pte, __pte(pte_val(pte) | _PAGE_SZHUGE)); return pte; }
static inline pte_t pte_mkspecial(pte_t pte)	{ 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; })

static 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; }

/* 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 })

#endif /* !__ASSEMBLY__ */

#define pfn_pte(pfn, prot)	__pte(((pfn) << PAGE_SHIFT) | pgprot_val(prot))
#define pfn_pmd(pfn, prot)	__pmd(((pfn) << PAGE_SHIFT) | pgprot_val(prot))

#endif /* __ASM_SH_PGTABLE_64_H */