summaryrefslogtreecommitdiff
path: root/include/asm-m32r/pgtable.h
blob: e6359c566b504f50ae462cc9c917b2126603052d (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
#ifndef _ASM_M32R_PGTABLE_H
#define _ASM_M32R_PGTABLE_H

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

#ifdef __KERNEL__
/*
 * The Linux memory management assumes a three-level page table setup. On
 * the M32R, we use that, but "fold" the mid level into the top-level page
 * table, so that we physically have the same two-level page table as the
 * M32R mmu expects.
 *
 * This file contains the functions and defines necessary to modify and use
 * the M32R page table tree.
 */

/* CAUTION!: If you change macro definitions in this file, you might have to
 * change arch/m32r/mmu.S manually.
 */

#ifndef __ASSEMBLY__

#include <linux/threads.h>
#include <linux/bitops.h>
#include <asm/processor.h>
#include <asm/addrspace.h>
#include <asm/page.h>

struct mm_struct;
struct vm_area_struct;

extern pgd_t swapper_pg_dir[1024];
extern void paging_init(void);

/*
 * ZERO_PAGE is a global shared page that is always zero: used
 * for zero-mapped memory areas etc..
 */
extern unsigned long empty_zero_page[1024];
#define ZERO_PAGE(vaddr)	(virt_to_page(empty_zero_page))

#endif /* !__ASSEMBLY__ */

#ifndef __ASSEMBLY__
#include <asm/pgtable-2level.h>
#endif

#define pgtable_cache_init()	do { } while (0)

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

#define USER_PTRS_PER_PGD	(TASK_SIZE / PGDIR_SIZE)
#define FIRST_USER_ADDRESS	0

#ifndef __ASSEMBLY__
/* Just any arbitrary offset to the start of the vmalloc VM area: the
 * current 8MB value just means that there will be a 8MB "hole" after the
 * physical memory until the kernel virtual memory starts.  That means that
 * any out-of-bounds memory accesses will hopefully be caught.
 * The vmalloc() routines leaves a hole of 4kB between each vmalloced
 * area for the same reason. ;)
 */
#define VMALLOC_START		KSEG2
#define VMALLOC_END		KSEG3

/*
 *     M32R TLB format
 *
 *     [0]    [1:19]           [20:23]       [24:31]
 *     +-----------------------+----+-------------+
 *     |          VPN          |0000|    ASID     |
 *     +-----------------------+----+-------------+
 *     +-+---------------------+----+-+---+-+-+-+-+
 *     |0         PPN          |0000|N|AC |L|G|V| |
 *     +-+---------------------+----+-+---+-+-+-+-+
 *                                     RWX
 */

#define _PAGE_BIT_DIRTY		0	/* software: page changed */
#define _PAGE_BIT_FILE		0	/* when !present: nonlinear file
					   mapping */
#define _PAGE_BIT_PRESENT	1	/* Valid: page is valid */
#define _PAGE_BIT_GLOBAL	2	/* Global */
#define _PAGE_BIT_LARGE		3	/* Large */
#define _PAGE_BIT_EXEC		4	/* Execute */
#define _PAGE_BIT_WRITE		5	/* Write */
#define _PAGE_BIT_READ		6	/* Read */
#define _PAGE_BIT_NONCACHABLE	7	/* Non cachable */
#define _PAGE_BIT_ACCESSED	8	/* software: page referenced */
#define _PAGE_BIT_PROTNONE	9	/* software: if not present */

#define _PAGE_DIRTY		(1UL << _PAGE_BIT_DIRTY)
#define _PAGE_FILE		(1UL << _PAGE_BIT_FILE)
#define _PAGE_PRESENT		(1UL << _PAGE_BIT_PRESENT)
#define _PAGE_GLOBAL		(1UL << _PAGE_BIT_GLOBAL)
#define _PAGE_LARGE		(1UL << _PAGE_BIT_LARGE)
#define _PAGE_EXEC		(1UL << _PAGE_BIT_EXEC)
#define _PAGE_WRITE		(1UL << _PAGE_BIT_WRITE)
#define _PAGE_READ		(1UL << _PAGE_BIT_READ)
#define _PAGE_NONCACHABLE	(1UL << _PAGE_BIT_NONCACHABLE)
#define _PAGE_ACCESSED		(1UL << _PAGE_BIT_ACCESSED)
#define _PAGE_PROTNONE		(1UL << _PAGE_BIT_PROTNONE)

#define _PAGE_TABLE	\
	( _PAGE_PRESENT | _PAGE_WRITE | _PAGE_READ | _PAGE_ACCESSED \
	| _PAGE_DIRTY )
#define _KERNPG_TABLE	\
	( _PAGE_PRESENT | _PAGE_WRITE | _PAGE_READ | _PAGE_ACCESSED \
	| _PAGE_DIRTY )
#define _PAGE_CHG_MASK	\
	( PTE_MASK | _PAGE_ACCESSED | _PAGE_DIRTY )

#ifdef CONFIG_MMU
#define PAGE_NONE	\
	__pgprot(_PAGE_PROTNONE | _PAGE_ACCESSED)
#define PAGE_SHARED	\
	__pgprot(_PAGE_PRESENT | _PAGE_WRITE | _PAGE_READ | _PAGE_ACCESSED)
#define PAGE_SHARED_EXEC \
	__pgprot(_PAGE_PRESENT | _PAGE_EXEC | _PAGE_WRITE | _PAGE_READ \
		| _PAGE_ACCESSED)
#define PAGE_COPY	\
	__pgprot(_PAGE_PRESENT | _PAGE_READ | _PAGE_ACCESSED)
#define PAGE_COPY_EXEC	\
	__pgprot(_PAGE_PRESENT | _PAGE_EXEC | _PAGE_READ | _PAGE_ACCESSED)
#define PAGE_READONLY	\
	__pgprot(_PAGE_PRESENT | _PAGE_READ | _PAGE_ACCESSED)
#define PAGE_READONLY_EXEC \
	__pgprot(_PAGE_PRESENT | _PAGE_EXEC | _PAGE_READ | _PAGE_ACCESSED)

#define __PAGE_KERNEL	\
	( _PAGE_PRESENT | _PAGE_EXEC | _PAGE_WRITE | _PAGE_READ | _PAGE_DIRTY \
	| _PAGE_ACCESSED )
#define __PAGE_KERNEL_RO	( __PAGE_KERNEL & ~_PAGE_WRITE )
#define __PAGE_KERNEL_NOCACHE	( __PAGE_KERNEL | _PAGE_NONCACHABLE)

#define MAKE_GLOBAL(x)	__pgprot((x) | _PAGE_GLOBAL)

#define PAGE_KERNEL		MAKE_GLOBAL(__PAGE_KERNEL)
#define PAGE_KERNEL_RO		MAKE_GLOBAL(__PAGE_KERNEL_RO)
#define PAGE_KERNEL_NOCACHE	MAKE_GLOBAL(__PAGE_KERNEL_NOCACHE)

#else
#define PAGE_NONE		__pgprot(0)
#define PAGE_SHARED		__pgprot(0)
#define PAGE_SHARED_EXEC	__pgprot(0)
#define PAGE_COPY		__pgprot(0)
#define PAGE_COPY_EXEC		__pgprot(0)
#define PAGE_READONLY		__pgprot(0)
#define PAGE_READONLY_EXEC	__pgprot(0)

#define PAGE_KERNEL		__pgprot(0)
#define PAGE_KERNEL_RO		__pgprot(0)
#define PAGE_KERNEL_NOCACHE	__pgprot(0)
#endif /* CONFIG_MMU */

	/* xwr */
#define __P000	PAGE_NONE
#define __P001	PAGE_READONLY
#define __P010	PAGE_COPY
#define __P011	PAGE_COPY
#define __P100	PAGE_READONLY_EXEC
#define __P101	PAGE_READONLY_EXEC
#define __P110	PAGE_COPY_EXEC
#define __P111	PAGE_COPY_EXEC

#define __S000	PAGE_NONE
#define __S001	PAGE_READONLY
#define __S010	PAGE_SHARED
#define __S011	PAGE_SHARED
#define __S100	PAGE_READONLY_EXEC
#define __S101	PAGE_READONLY_EXEC
#define __S110	PAGE_SHARED_EXEC
#define __S111	PAGE_SHARED_EXEC

/* page table for 0-4MB for everybody */

#define pte_present(x)	(pte_val(x) & (_PAGE_PRESENT | _PAGE_PROTNONE))
#define pte_clear(mm,addr,xp)	do { set_pte_at(mm, addr, xp, __pte(0)); } while (0)

#define pmd_none(x)	(!pmd_val(x))
#define pmd_present(x)	(pmd_val(x) & _PAGE_PRESENT)
#define pmd_clear(xp)	do { set_pmd(xp, __pmd(0)); } while (0)
#define	pmd_bad(x)	((pmd_val(x) & ~PAGE_MASK) != _KERNPG_TABLE)

#define pages_to_mb(x)	((x) >> (20 - PAGE_SHIFT))

/*
 * The following only work if pte_present() is true.
 * Undefined behaviour if not..
 */
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_write(pte_t pte)
{
	return pte_val(pte) & _PAGE_WRITE;
}

/*
 * The following only works if pte_present() is not true.
 */
static inline int pte_file(pte_t pte)
{
	return pte_val(pte) & _PAGE_FILE;
}

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

static inline pte_t pte_mkclean(pte_t pte)
{
	pte_val(pte) &= ~_PAGE_DIRTY;
	return pte;
}

static inline pte_t pte_mkold(pte_t pte)
{
	pte_val(pte) &= ~_PAGE_ACCESSED;
	return pte;
}

static inline pte_t pte_wrprotect(pte_t pte)
{
	pte_val(pte) &= ~_PAGE_WRITE;
	return pte;
}

static inline pte_t pte_mkdirty(pte_t pte)
{
	pte_val(pte) |= _PAGE_DIRTY;
	return pte;
}

static inline pte_t pte_mkyoung(pte_t pte)
{
	pte_val(pte) |= _PAGE_ACCESSED;
	return pte;
}

static inline pte_t pte_mkwrite(pte_t pte)
{
	pte_val(pte) |= _PAGE_WRITE;
	return pte;
}

static inline pte_t pte_mkspecial(pte_t pte)
{
	return pte;
}

static inline  int ptep_test_and_clear_young(struct vm_area_struct *vma, unsigned long addr, pte_t *ptep)
{
	return test_and_clear_bit(_PAGE_BIT_ACCESSED, ptep);
}

static inline void ptep_set_wrprotect(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
{
	clear_bit(_PAGE_BIT_WRITE, ptep);
}

/*
 * Macro and implementation to make a page protection as uncachable.
 */
static inline pgprot_t pgprot_noncached(pgprot_t _prot)
{
	unsigned long prot = pgprot_val(_prot);

	prot |= _PAGE_NONCACHABLE;
	return __pgprot(prot);
}

#define pgprot_writecombine(prot) pgprot_noncached(prot)

/*
 * Conversion functions: convert a page and protection to a page entry,
 * and a page entry and page directory to the page they refer to.
 */
#define mk_pte(page, pgprot)	pfn_pte(page_to_pfn(page), pgprot)

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;
}

/*
 * Conversion functions: convert a page and protection to a page entry,
 * and a page entry and page directory to the page they refer to.
 */

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

#define pmd_page_vaddr(pmd)	\
	((unsigned long) __va(pmd_val(pmd) & PAGE_MASK))

#ifndef CONFIG_DISCONTIGMEM
#define pmd_page(pmd)	(mem_map + ((pmd_val(pmd) >> PAGE_SHIFT) - PFN_BASE))
#endif /* !CONFIG_DISCONTIGMEM */

/* to find an entry in a page-table-directory. */
#define pgd_index(address)	\
	(((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD - 1))

#define pgd_offset(mm, address)	((mm)->pgd + pgd_index(address))

/* to find an entry in a kernel page-table-directory */
#define pgd_offset_k(address)	pgd_offset(&init_mm, address)

#define pmd_index(address)	\
	(((address) >> PMD_SHIFT) & (PTRS_PER_PMD - 1))

#define pte_index(address)	\
	(((address) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1))
#define pte_offset_kernel(dir, address)	\
	((pte_t *)pmd_page_vaddr(*(dir)) + pte_index(address))
#define pte_offset_map(dir, address)	\
	((pte_t *)page_address(pmd_page(*(dir))) + pte_index(address))
#define pte_offset_map_nested(dir, address)	pte_offset_map(dir, address)
#define pte_unmap(pte)		do { } while (0)
#define pte_unmap_nested(pte)	do { } while (0)

/* Encode and de-code a swap entry */
#define __swp_type(x)			(((x).val >> 2) & 0x1f)
#define __swp_offset(x)			((x).val >> 10)
#define __swp_entry(type, offset)	\
	((swp_entry_t) { ((type) << 2) | ((offset) << 10) })
#define __pte_to_swp_entry(pte)		((swp_entry_t) { pte_val(pte) })
#define __swp_entry_to_pte(x)		((pte_t) { (x).val })

#endif /* !__ASSEMBLY__ */

/* Needs to be defined here and not in linux/mm.h, as it is arch dependent */
#define kern_addr_valid(addr)	(1)

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

#define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG
#define __HAVE_ARCH_PTEP_GET_AND_CLEAR
#define __HAVE_ARCH_PTEP_SET_WRPROTECT
#define __HAVE_ARCH_PTE_SAME
#include <asm-generic/pgtable.h>

#endif /* __KERNEL__ */

#endif /* _ASM_M32R_PGTABLE_H */