summaryrefslogtreecommitdiff
path: root/arch/score/include/asm/pgtable.h
blob: c14226be055901795c264df5e8e84f43d2cd330f (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
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _ASM_SCORE_PGTABLE_H
#define _ASM_SCORE_PGTABLE_H

#include <linux/const.h>
#define __ARCH_USE_5LEVEL_HACK
#include <asm-generic/pgtable-nopmd.h>

#include <asm/fixmap.h>
#include <asm/setup.h>
#include <asm/pgtable-bits.h>

extern void load_pgd(unsigned long pg_dir);
extern pte_t invalid_pte_table[PAGE_SIZE/sizeof(pte_t)];

/* PGDIR_SHIFT determines what a third-level page table entry can map */
#define PGDIR_SHIFT	22
#define PGDIR_SIZE	(_AC(1, UL) << PGDIR_SHIFT)
#define PGDIR_MASK	(~(PGDIR_SIZE - 1))

/*
 * Entries per page directory level: we use two-level, so
 * we don't really have any PUD/PMD directory physically.
 */
#define PGD_ORDER	0
#define PTE_ORDER	0

#define PTRS_PER_PGD	1024
#define PTRS_PER_PTE	1024

#define USER_PTRS_PER_PGD	(0x80000000UL/PGDIR_SIZE)
#define FIRST_USER_ADDRESS	0UL

#define VMALLOC_START		(0xc0000000UL)

#define PKMAP_BASE		(0xfd000000UL)

#define VMALLOC_END		(FIXADDR_START - 2*PAGE_SIZE)

#define pte_ERROR(e) \
	printk(KERN_ERR "%s:%d: bad pte %08lx.\n", \
		__FILE__, __LINE__, pte_val(e))
#define pgd_ERROR(e) \
	printk(KERN_ERR "%s:%d: bad pgd %08lx.\n", \
		__FILE__, __LINE__, pgd_val(e))

/*
 * Empty pgd/pmd entries point to the invalid_pte_table.
 */
static inline int pmd_none(pmd_t pmd)
{
	return pmd_val(pmd) == (unsigned long) invalid_pte_table;
}

#define pmd_bad(pmd)		(pmd_val(pmd) & ~PAGE_MASK)

static inline int pmd_present(pmd_t pmd)
{
	return pmd_val(pmd) != (unsigned long) invalid_pte_table;
}

static inline void pmd_clear(pmd_t *pmdp)
{
	pmd_val(*pmdp) = ((unsigned long) invalid_pte_table);
}

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

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

/* to find an entry in a kernel page-table-directory */
#define pgd_offset_k(address)	pgd_offset(&init_mm, address)
#define pgd_index(address)	(((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD-1))

/* to find an entry in a page-table-directory */
#define pgd_offset(mm, addr)	((mm)->pgd + pgd_index(addr))

/* Find an entry in the third-level page table.. */
#define __pte_offset(address)		\
	(((address) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1))
#define pte_offset(dir, address)	\
	((pte_t *) pmd_page_vaddr(*(dir)) + __pte_offset(address))
#define pte_offset_kernel(dir, address)	\
	((pte_t *) pmd_page_vaddr(*(dir)) + __pte_offset(address))

#define pte_offset_map(dir, address)	\
	((pte_t *)page_address(pmd_page(*(dir))) + __pte_offset(address))
#define pte_unmap(pte) ((void)(pte))

#define __pte_to_swp_entry(pte)		\
	((swp_entry_t) { pte_val(pte)})
#define __swp_entry_to_pte(x)	((pte_t) {(x).val})

#define pmd_phys(pmd)		__pa((void *)pmd_val(pmd))
#define pmd_page(pmd)		(pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT))
#define mk_pte(page, prot)	pfn_pte(page_to_pfn(page), prot)
static inline pte_t pte_mkspecial(pte_t pte) { return pte; }

#define set_pte(pteptr, pteval) (*(pteptr) = pteval)
#define set_pte_at(mm, addr, ptep, pteval) set_pte(ptep, pteval)
#define pte_clear(mm, addr, xp)		\
	do { set_pte_at(mm, addr, xp, __pte(0)); } while (0)

/*
 * The "pgd_xxx()" functions here are trivial for a folded two-level
 * setup: the pgd is never bad, and a pmd always exists (as it's folded
 * into the pgd entry)
 */
#define pgd_present(pgd)	(1)
#define pgd_none(pgd)		(0)
#define pgd_bad(pgd)		(0)
#define pgd_clear(pgdp)		do { } while (0)

#define kern_addr_valid(addr)	(1)
#define pmd_page_vaddr(pmd)	pmd_val(pmd)

#define pte_none(pte)		(!(pte_val(pte) & ~_PAGE_GLOBAL))
#define pte_present(pte)	(pte_val(pte) & _PAGE_PRESENT)

#define PAGE_NONE	__pgprot(_PAGE_PRESENT | _PAGE_CACHE)
#define PAGE_SHARED	__pgprot(_PAGE_PRESENT | _PAGE_READ | _PAGE_WRITE | \
				_PAGE_CACHE)
#define PAGE_COPY	__pgprot(_PAGE_PRESENT | _PAGE_READ | _PAGE_CACHE)
#define PAGE_READONLY	__pgprot(_PAGE_PRESENT | _PAGE_READ | _PAGE_CACHE)
#define PAGE_KERNEL	__pgprot(_PAGE_PRESENT | __READABLE | __WRITEABLE | \
				_PAGE_GLOBAL | _PAGE_CACHE)
#define PAGE_KERNEL_UNCACHED __pgprot(_PAGE_PRESENT | __READABLE | \
				__WRITEABLE | _PAGE_GLOBAL & ~_PAGE_CACHE)

#define __P000	PAGE_NONE
#define __P001	PAGE_READONLY
#define __P010	PAGE_COPY
#define __P011	PAGE_COPY
#define __P100	PAGE_READONLY
#define __P101	PAGE_READONLY
#define __P110	PAGE_COPY
#define __P111	PAGE_COPY

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

#define pgprot_noncached pgprot_noncached

static inline pgprot_t pgprot_noncached(pgprot_t _prot)
{
	unsigned long prot = pgprot_val(_prot);

	prot = (prot & ~_CACHE_MASK);

	return __pgprot(prot);
}

#define __swp_type(x)		((x).val & 0x1f)
#define __swp_offset(x) 	((x).val >> 10)
#define __swp_entry(type, offset) ((swp_entry_t){(type) | ((offset) << 10)})

extern unsigned long empty_zero_page;
extern unsigned long zero_page_mask;

#define ZERO_PAGE(vaddr) \
	(virt_to_page((void *)(empty_zero_page + \
	 (((unsigned long)(vaddr)) & zero_page_mask))))

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

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

static inline int pte_write(pte_t pte)
{
	return pte_val(pte) & _PAGE_WRITE;
}

static inline int pte_dirty(pte_t pte)
{
	return pte_val(pte) & _PAGE_MODIFIED;
}

static inline int pte_young(pte_t pte)
{
	return pte_val(pte) & _PAGE_ACCESSED;
}

#define pte_special(pte)	(0)

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

static inline pte_t pte_mkclean(pte_t pte)
{
	pte_val(pte) &= ~(_PAGE_MODIFIED|_PAGE_SILENT_WRITE);
	return pte;
}

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

static inline pte_t pte_mkwrite(pte_t pte)
{
	pte_val(pte) |= _PAGE_WRITE;
	if (pte_val(pte) & _PAGE_MODIFIED)
		pte_val(pte) |= _PAGE_SILENT_WRITE;
	return pte;
}

static inline pte_t pte_mkdirty(pte_t pte)
{
	pte_val(pte) |= _PAGE_MODIFIED;
	if (pte_val(pte) & _PAGE_WRITE)
		pte_val(pte) |= _PAGE_SILENT_WRITE;
	return pte;
}

static inline pte_t pte_mkyoung(pte_t pte)
{
	pte_val(pte) |= _PAGE_ACCESSED;
	if (pte_val(pte) & _PAGE_READ)
		pte_val(pte) |= _PAGE_SILENT_READ;
	return pte;
}

#define set_pmd(pmdptr, pmdval)		\
	 do { *(pmdptr) = (pmdval); } while (0)
#define pte_present(pte)	(pte_val(pte) & _PAGE_PRESENT)

extern unsigned long pgd_current;
extern pgd_t swapper_pg_dir[PTRS_PER_PGD];
extern void paging_init(void);

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

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

static inline void update_mmu_cache(struct vm_area_struct *vma,
	unsigned long address, pte_t *ptep)
{
	pte_t pte = *ptep;
	__update_tlb(vma, address, pte);
	__update_cache(vma, address, pte);
}

#ifndef __ASSEMBLY__
#include <asm-generic/pgtable.h>

void setup_memory(void);
#endif /* __ASSEMBLY__ */

#endif /* _ASM_SCORE_PGTABLE_H */