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1/*
2 * Copyright (C) 2011 Tobias Klauser <tklauser@distanz.ch>
3 * Copyright (C) 2009 Wind River Systems Inc
4 *
5 * Based on asm/pgtable-32.h from mips which is:
6 *
7 * Copyright (C) 1994, 95, 96, 97, 98, 99, 2000, 2003 Ralf Baechle
8 * Copyright (C) 1999, 2000, 2001 Silicon Graphics, Inc.
9 *
10 * This file is subject to the terms and conditions of the GNU General Public
11 * License. See the file "COPYING" in the main directory of this archive
12 * for more details.
13 */
14
15#ifndef _ASM_NIOS2_PGTABLE_H
16#define _ASM_NIOS2_PGTABLE_H
17
18#include <linux/io.h>
19#include <linux/bug.h>
20#include <asm/page.h>
21#include <asm/cacheflush.h>
22#include <asm/tlbflush.h>
23
24#include <asm/pgtable-bits.h>
25#include <asm-generic/pgtable-nopmd.h>
26
27#define FIRST_USER_ADDRESS 0
28
29#define VMALLOC_START CONFIG_NIOS2_KERNEL_MMU_REGION_BASE
30#define VMALLOC_END (CONFIG_NIOS2_KERNEL_REGION_BASE - 1)
31
32struct mm_struct;
33
34/* Helper macro */
35#define MKP(x, w, r) __pgprot(_PAGE_PRESENT | _PAGE_CACHED | \
36 ((x) ? _PAGE_EXEC : 0) | \
37 ((r) ? _PAGE_READ : 0) | \
38 ((w) ? _PAGE_WRITE : 0))
39/*
40 * These are the macros that generic kernel code needs
41 * (to populate protection_map[])
42 */
43
44/* Remove W bit on private pages for COW support */
45#define __P000 MKP(0, 0, 0)
46#define __P001 MKP(0, 0, 1)
47#define __P010 MKP(0, 0, 0) /* COW */
48#define __P011 MKP(0, 0, 1) /* COW */
49#define __P100 MKP(1, 0, 0)
50#define __P101 MKP(1, 0, 1)
51#define __P110 MKP(1, 0, 0) /* COW */
52#define __P111 MKP(1, 0, 1) /* COW */
53
54/* Shared pages can have exact HW mapping */
55#define __S000 MKP(0, 0, 0)
56#define __S001 MKP(0, 0, 1)
57#define __S010 MKP(0, 1, 0)
58#define __S011 MKP(0, 1, 1)
59#define __S100 MKP(1, 0, 0)
60#define __S101 MKP(1, 0, 1)
61#define __S110 MKP(1, 1, 0)
62#define __S111 MKP(1, 1, 1)
63
64/* Used all over the kernel */
65#define PAGE_KERNEL __pgprot(_PAGE_PRESENT | _PAGE_CACHED | _PAGE_READ | \
66 _PAGE_WRITE | _PAGE_EXEC | _PAGE_GLOBAL)
67
68#define PAGE_SHARED __pgprot(_PAGE_PRESENT | _PAGE_CACHED | _PAGE_READ | \
69 _PAGE_WRITE | _PAGE_ACCESSED)
70
71#define PAGE_COPY MKP(0, 0, 1)
72
73#define PGD_ORDER 0
74#define PTE_ORDER 0
75
76#define PTRS_PER_PGD ((PAGE_SIZE << PGD_ORDER) / sizeof(pgd_t))
77#define PTRS_PER_PTE ((PAGE_SIZE << PTE_ORDER) / sizeof(pte_t))
78
79#define USER_PTRS_PER_PGD \
80 (CONFIG_NIOS2_KERNEL_MMU_REGION_BASE / PGDIR_SIZE)
81
82#define PGDIR_SHIFT 22
83#define PGDIR_SIZE (1UL << PGDIR_SHIFT)
84#define PGDIR_MASK (~(PGDIR_SIZE-1))
85
86/*
87 * ZERO_PAGE is a global shared page that is always zero: used
88 * for zero-mapped memory areas etc..
89 */
90extern unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)];
91#define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page))
92
93extern pgd_t swapper_pg_dir[PTRS_PER_PGD];
94extern pte_t invalid_pte_table[PAGE_SIZE/sizeof(pte_t)];
95
96/*
97 * (pmds are folded into puds so this doesn't get actually called,
98 * but the define is needed for a generic inline function.)
99 */
100static inline void set_pmd(pmd_t *pmdptr, pmd_t pmdval)
101{
102 pmdptr->pud.pgd.pgd = pmdval.pud.pgd.pgd;
103}
104
105/* to find an entry in a page-table-directory */
106#define pgd_index(addr) (((addr) >> PGDIR_SHIFT) & (PTRS_PER_PGD - 1))
107#define pgd_offset(mm, addr) ((mm)->pgd + pgd_index(addr))
108
109static inline int pte_write(pte_t pte) \
110 { return pte_val(pte) & _PAGE_WRITE; }
111static inline int pte_dirty(pte_t pte) \
112 { return pte_val(pte) & _PAGE_DIRTY; }
113static inline int pte_young(pte_t pte) \
114 { return pte_val(pte) & _PAGE_ACCESSED; }
115static inline int pte_file(pte_t pte) \
116 { return pte_val(pte) & _PAGE_FILE; }
117static inline int pte_special(pte_t pte) { return 0; }
118
119#define pgprot_noncached pgprot_noncached
120
121static inline pgprot_t pgprot_noncached(pgprot_t _prot)
122{
123 unsigned long prot = pgprot_val(_prot);
124
125 prot &= ~_PAGE_CACHED;
126
127 return __pgprot(prot);
128}
129
130static inline int pte_none(pte_t pte)
131{
132 return !(pte_val(pte) & ~(_PAGE_GLOBAL|0xf));
133}
134
135static inline int pte_present(pte_t pte) \
136 { return pte_val(pte) & _PAGE_PRESENT; }
137
138/*
139 * The following only work if pte_present() is true.
140 * Undefined behaviour if not..
141 */
142static inline pte_t pte_wrprotect(pte_t pte)
143{
144 pte_val(pte) &= ~_PAGE_WRITE;
145 return pte;
146}
147
148static inline pte_t pte_mkclean(pte_t pte)
149{
150 pte_val(pte) &= ~_PAGE_DIRTY;
151 return pte;
152}
153
154static inline pte_t pte_mkold(pte_t pte)
155{
156 pte_val(pte) &= ~_PAGE_ACCESSED;
157 return pte;
158}
159
160static inline pte_t pte_mkwrite(pte_t pte)
161{
162 pte_val(pte) |= _PAGE_WRITE;
163 return pte;
164}
165
166static inline pte_t pte_mkdirty(pte_t pte)
167{
168 pte_val(pte) |= _PAGE_DIRTY;
169 return pte;
170}
171
172static inline pte_t pte_mkspecial(pte_t pte) { return pte; }
173
174static inline pte_t pte_mkyoung(pte_t pte)
175{
176 pte_val(pte) |= _PAGE_ACCESSED;
177 return pte;
178}
179
180static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
181{
182 const unsigned long mask = _PAGE_READ | _PAGE_WRITE | _PAGE_EXEC;
183
184 pte_val(pte) = (pte_val(pte) & ~mask) | (pgprot_val(newprot) & mask);
185 return pte;
186}
187
188static inline int pmd_present(pmd_t pmd)
189{
190 return (pmd_val(pmd) != (unsigned long) invalid_pte_table)
191 && (pmd_val(pmd) != 0UL);
192}
193
194static inline void pmd_clear(pmd_t *pmdp)
195{
196 pmd_val(*pmdp) = (unsigned long) invalid_pte_table;
197}
198
199#define pte_pfn(pte) (pte_val(pte) & 0xfffff)
200#define pfn_pte(pfn, prot) (__pte(pfn | pgprot_val(prot)))
201#define pte_page(pte) (pfn_to_page(pte_pfn(pte)))
202
203/*
204 * Store a linux PTE into the linux page table.
205 */
206static inline void set_pte(pte_t *ptep, pte_t pteval)
207{
208 *ptep = pteval;
209}
210
211static inline void set_pte_at(struct mm_struct *mm, unsigned long addr,
212 pte_t *ptep, pte_t pteval)
213{
214 unsigned long paddr = page_to_virt(pte_page(pteval));
215
216 flush_dcache_range(paddr, paddr + PAGE_SIZE);
217 set_pte(ptep, pteval);
218}
219
220static inline int pmd_none(pmd_t pmd)
221{
222 return (pmd_val(pmd) ==
223 (unsigned long) invalid_pte_table) || (pmd_val(pmd) == 0UL);
224}
225
226#define pmd_bad(pmd) (pmd_val(pmd) & ~PAGE_MASK)
227
228static inline void pte_clear(struct mm_struct *mm,
229 unsigned long addr, pte_t *ptep)
230{
231 pte_t null;
232
233 pte_val(null) = (addr >> PAGE_SHIFT) & 0xf;
234
235 set_pte_at(mm, addr, ptep, null);
236 flush_tlb_one(addr);
237}
238
239/*
240 * Conversion functions: convert a page and protection to a page entry,
241 * and a page entry and page directory to the page they refer to.
242 */
243#define mk_pte(page, prot) (pfn_pte(page_to_pfn(page), prot))
244
245#define pte_unmap(pte) do { } while (0)
246
247/*
248 * Conversion functions: convert a page and protection to a page entry,
249 * and a page entry and page directory to the page they refer to.
250 */
251#define pmd_phys(pmd) virt_to_phys((void *)pmd_val(pmd))
252#define pmd_page(pmd) (pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT))
253#define pmd_page_vaddr(pmd) pmd_val(pmd)
254
255#define pte_offset_map(dir, addr) \
256 ((pte_t *) page_address(pmd_page(*dir)) + \
257 (((addr) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1)))
258
259/* to find an entry in a kernel page-table-directory */
260#define pgd_offset_k(addr) pgd_offset(&init_mm, addr)
261
262/* Get the address to the PTE for a vaddr in specific directory */
263#define pte_offset_kernel(dir, addr) \
264 ((pte_t *) pmd_page_vaddr(*(dir)) + \
265 (((addr) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1)))
266
267#define pte_ERROR(e) \
268 pr_err("%s:%d: bad pte %08lx.\n", \
269 __FILE__, __LINE__, pte_val(e))
270#define pgd_ERROR(e) \
271 pr_err("%s:%d: bad pgd %08lx.\n", \
272 __FILE__, __LINE__, pgd_val(e))
273
274/*
275 * Encode and decode a swap entry (must be !pte_none(pte) && !pte_present(pte)
276 * && !pte_file(pte)):
277 *
278 * 31 30 29 28 27 26 25 24 23 22 21 20 19 18 ... 1 0
279 * 0 0 0 0 type. 0 0 0 0 0 0 offset.........
280 *
281 * This gives us up to 2**2 = 4 swap files and 2**20 * 4K = 4G per swap file.
282 *
283 * Note that the offset field is always non-zero, thus !pte_none(pte) is always
284 * true.
285 */
286#define __swp_type(swp) (((swp).val >> 26) & 0x3)
287#define __swp_offset(swp) ((swp).val & 0xfffff)
288#define __swp_entry(type, off) ((swp_entry_t) { (((type) & 0x3) << 26) \
289 | ((off) & 0xfffff) })
290#define __swp_entry_to_pte(swp) ((pte_t) { (swp).val })
291#define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) })
292
293/* Encode and decode a nonlinear file mapping entry */
294#define PTE_FILE_MAX_BITS 25
295#define pte_to_pgoff(pte) (pte_val(pte) & 0x1ffffff)
296#define pgoff_to_pte(off) __pte(((off) & 0x1ffffff) | _PAGE_FILE)
297
298#define kern_addr_valid(addr) (1)
299
300#include <asm-generic/pgtable.h>
301
302#define pgtable_cache_init() do { } while (0)
303
304extern void __init paging_init(void);
305extern void __init mmu_init(void);
306
307extern void update_mmu_cache(struct vm_area_struct *vma,
308 unsigned long address, pte_t *pte);
309
310#endif /* _ASM_NIOS2_PGTABLE_H */