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Linux kernel mirror (for testing)
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kernel
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linux
1#ifndef _ASM_SCORE_PGTABLE_H
2#define _ASM_SCORE_PGTABLE_H
3
4#include <linux/const.h>
5#include <asm-generic/pgtable-nopmd.h>
6
7#include <asm/fixmap.h>
8#include <asm/setup.h>
9#include <asm/pgtable-bits.h>
10
11extern void load_pgd(unsigned long pg_dir);
12extern pte_t invalid_pte_table[PAGE_SIZE/sizeof(pte_t)];
13
14/* PGDIR_SHIFT determines what a third-level page table entry can map */
15#define PGDIR_SHIFT 22
16#define PGDIR_SIZE (_AC(1, UL) << PGDIR_SHIFT)
17#define PGDIR_MASK (~(PGDIR_SIZE - 1))
18
19/*
20 * Entries per page directory level: we use two-level, so
21 * we don't really have any PUD/PMD directory physically.
22 */
23#define PGD_ORDER 0
24#define PTE_ORDER 0
25
26#define PTRS_PER_PGD 1024
27#define PTRS_PER_PTE 1024
28
29#define USER_PTRS_PER_PGD (0x80000000UL/PGDIR_SIZE)
30#define FIRST_USER_ADDRESS 0
31
32#define VMALLOC_START (0xc0000000UL)
33
34#define PKMAP_BASE (0xfd000000UL)
35
36#define VMALLOC_END (FIXADDR_START - 2*PAGE_SIZE)
37
38#define pte_ERROR(e) \
39 printk(KERN_ERR "%s:%d: bad pte %08lx.\n", \
40 __FILE__, __LINE__, pte_val(e))
41#define pgd_ERROR(e) \
42 printk(KERN_ERR "%s:%d: bad pgd %08lx.\n", \
43 __FILE__, __LINE__, pgd_val(e))
44
45/*
46 * Empty pgd/pmd entries point to the invalid_pte_table.
47 */
48static inline int pmd_none(pmd_t pmd)
49{
50 return pmd_val(pmd) == (unsigned long) invalid_pte_table;
51}
52
53#define pmd_bad(pmd) (pmd_val(pmd) & ~PAGE_MASK)
54
55static inline int pmd_present(pmd_t pmd)
56{
57 return pmd_val(pmd) != (unsigned long) invalid_pte_table;
58}
59
60static inline void pmd_clear(pmd_t *pmdp)
61{
62 pmd_val(*pmdp) = ((unsigned long) invalid_pte_table);
63}
64
65#define pte_page(x) pfn_to_page(pte_pfn(x))
66#define pte_pfn(x) ((unsigned long)((x).pte >> PAGE_SHIFT))
67#define pfn_pte(pfn, prot) \
68 __pte(((unsigned long long)(pfn) << PAGE_SHIFT) | pgprot_val(prot))
69
70#define __pgd_offset(address) pgd_index(address)
71#define __pud_offset(address) (((address) >> PUD_SHIFT) & (PTRS_PER_PUD-1))
72#define __pmd_offset(address) (((address) >> PMD_SHIFT) & (PTRS_PER_PMD-1))
73
74/* to find an entry in a kernel page-table-directory */
75#define pgd_offset_k(address) pgd_offset(&init_mm, address)
76#define pgd_index(address) (((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD-1))
77
78/* to find an entry in a page-table-directory */
79#define pgd_offset(mm, addr) ((mm)->pgd + pgd_index(addr))
80
81/* Find an entry in the third-level page table.. */
82#define __pte_offset(address) \
83 (((address) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1))
84#define pte_offset(dir, address) \
85 ((pte_t *) pmd_page_vaddr(*(dir)) + __pte_offset(address))
86#define pte_offset_kernel(dir, address) \
87 ((pte_t *) pmd_page_vaddr(*(dir)) + __pte_offset(address))
88
89#define pte_offset_map(dir, address) \
90 ((pte_t *)page_address(pmd_page(*(dir))) + __pte_offset(address))
91#define pte_offset_map_nested(dir, address) \
92 ((pte_t *)page_address(pmd_page(*(dir))) + __pte_offset(address))
93#define pte_unmap(pte) ((void)(pte))
94#define pte_unmap_nested(pte) ((void)(pte))
95
96/*
97 * Bits 9(_PAGE_PRESENT) and 10(_PAGE_FILE)are taken,
98 * split up 30 bits of offset into this range:
99 */
100#define PTE_FILE_MAX_BITS 30
101#define pte_to_pgoff(_pte) \
102 (((_pte).pte & 0x1ff) | (((_pte).pte >> 11) << 9))
103#define pgoff_to_pte(off) \
104 ((pte_t) {((off) & 0x1ff) | (((off) >> 9) << 11) | _PAGE_FILE})
105#define __pte_to_swp_entry(pte) \
106 ((swp_entry_t) { pte_val(pte)})
107#define __swp_entry_to_pte(x) ((pte_t) {(x).val})
108
109#define pmd_phys(pmd) __pa((void *)pmd_val(pmd))
110#define pmd_page(pmd) (pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT))
111#define mk_pte(page, prot) pfn_pte(page_to_pfn(page), prot)
112static inline pte_t pte_mkspecial(pte_t pte) { return pte; }
113
114#define set_pte(pteptr, pteval) (*(pteptr) = pteval)
115#define set_pte_at(mm, addr, ptep, pteval) set_pte(ptep, pteval)
116#define pte_clear(mm, addr, xp) \
117 do { set_pte_at(mm, addr, xp, __pte(0)); } while (0)
118
119#define io_remap_pfn_range(vma, vaddr, pfn, size, prot) \
120 remap_pfn_range(vma, vaddr, pfn, size, prot)
121
122/*
123 * The "pgd_xxx()" functions here are trivial for a folded two-level
124 * setup: the pgd is never bad, and a pmd always exists (as it's folded
125 * into the pgd entry)
126 */
127#define pgd_present(pgd) (1)
128#define pgd_none(pgd) (0)
129#define pgd_bad(pgd) (0)
130#define pgd_clear(pgdp) do { } while (0)
131
132#define kern_addr_valid(addr) (1)
133#define pmd_page_vaddr(pmd) pmd_val(pmd)
134
135#define pte_none(pte) (!(pte_val(pte) & ~_PAGE_GLOBAL))
136#define pte_present(pte) (pte_val(pte) & _PAGE_PRESENT)
137
138#define PAGE_NONE __pgprot(_PAGE_PRESENT | _PAGE_CACHE)
139#define PAGE_SHARED __pgprot(_PAGE_PRESENT | _PAGE_READ | _PAGE_WRITE | \
140 _PAGE_CACHE)
141#define PAGE_COPY __pgprot(_PAGE_PRESENT | _PAGE_READ | _PAGE_CACHE)
142#define PAGE_READONLY __pgprot(_PAGE_PRESENT | _PAGE_READ | _PAGE_CACHE)
143#define PAGE_KERNEL __pgprot(_PAGE_PRESENT | __READABLE | __WRITEABLE | \
144 _PAGE_GLOBAL | _PAGE_CACHE)
145#define PAGE_KERNEL_UNCACHED __pgprot(_PAGE_PRESENT | __READABLE | \
146 __WRITEABLE | _PAGE_GLOBAL & ~_PAGE_CACHE)
147
148#define __P000 PAGE_NONE
149#define __P001 PAGE_READONLY
150#define __P010 PAGE_COPY
151#define __P011 PAGE_COPY
152#define __P100 PAGE_READONLY
153#define __P101 PAGE_READONLY
154#define __P110 PAGE_COPY
155#define __P111 PAGE_COPY
156
157#define __S000 PAGE_NONE
158#define __S001 PAGE_READONLY
159#define __S010 PAGE_SHARED
160#define __S011 PAGE_SHARED
161#define __S100 PAGE_READONLY
162#define __S101 PAGE_READONLY
163#define __S110 PAGE_SHARED
164#define __S111 PAGE_SHARED
165
166#define pgprot_noncached pgprot_noncached
167
168static inline pgprot_t pgprot_noncached(pgprot_t _prot)
169{
170 unsigned long prot = pgprot_val(_prot);
171
172 prot = (prot & ~_CACHE_MASK);
173
174 return __pgprot(prot);
175}
176
177#define __swp_type(x) ((x).val & 0x1f)
178#define __swp_offset(x) ((x).val >> 11)
179#define __swp_entry(type, offset) ((swp_entry_t){(type) | ((offset) << 11)})
180
181extern unsigned long empty_zero_page;
182extern unsigned long zero_page_mask;
183
184#define ZERO_PAGE(vaddr) \
185 (virt_to_page((void *)(empty_zero_page + \
186 (((unsigned long)(vaddr)) & zero_page_mask))))
187
188#define pgtable_cache_init() do {} while (0)
189
190#define arch_enter_lazy_cpu_mode() do {} while (0)
191
192static inline int pte_write(pte_t pte)
193{
194 return pte_val(pte) & _PAGE_WRITE;
195}
196
197static inline int pte_dirty(pte_t pte)
198{
199 return pte_val(pte) & _PAGE_MODIFIED;
200}
201
202static inline int pte_young(pte_t pte)
203{
204 return pte_val(pte) & _PAGE_ACCESSED;
205}
206
207static inline int pte_file(pte_t pte)
208{
209 return pte_val(pte) & _PAGE_FILE;
210}
211
212#define pte_special(pte) (0)
213
214static inline pte_t pte_wrprotect(pte_t pte)
215{
216 pte_val(pte) &= ~(_PAGE_WRITE | _PAGE_SILENT_WRITE);
217 return pte;
218}
219
220static inline pte_t pte_mkclean(pte_t pte)
221{
222 pte_val(pte) &= ~(_PAGE_MODIFIED|_PAGE_SILENT_WRITE);
223 return pte;
224}
225
226static inline pte_t pte_mkold(pte_t pte)
227{
228 pte_val(pte) &= ~(_PAGE_ACCESSED|_PAGE_SILENT_READ);
229 return pte;
230}
231
232static inline pte_t pte_mkwrite(pte_t pte)
233{
234 pte_val(pte) |= _PAGE_WRITE;
235 if (pte_val(pte) & _PAGE_MODIFIED)
236 pte_val(pte) |= _PAGE_SILENT_WRITE;
237 return pte;
238}
239
240static inline pte_t pte_mkdirty(pte_t pte)
241{
242 pte_val(pte) |= _PAGE_MODIFIED;
243 if (pte_val(pte) & _PAGE_WRITE)
244 pte_val(pte) |= _PAGE_SILENT_WRITE;
245 return pte;
246}
247
248static inline pte_t pte_mkyoung(pte_t pte)
249{
250 pte_val(pte) |= _PAGE_ACCESSED;
251 if (pte_val(pte) & _PAGE_READ)
252 pte_val(pte) |= _PAGE_SILENT_READ;
253 return pte;
254}
255
256#define set_pmd(pmdptr, pmdval) \
257 do { *(pmdptr) = (pmdval); } while (0)
258#define pte_present(pte) (pte_val(pte) & _PAGE_PRESENT)
259
260extern unsigned long pgd_current;
261extern pgd_t swapper_pg_dir[PTRS_PER_PGD];
262extern void paging_init(void);
263
264static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
265{
266 return __pte((pte_val(pte) & _PAGE_CHG_MASK) | pgprot_val(newprot));
267}
268
269extern void __update_tlb(struct vm_area_struct *vma,
270 unsigned long address, pte_t pte);
271extern void __update_cache(struct vm_area_struct *vma,
272 unsigned long address, pte_t pte);
273
274static inline void update_mmu_cache(struct vm_area_struct *vma,
275 unsigned long address, pte_t *ptep)
276{
277 pte_t pte = *ptep;
278 __update_tlb(vma, address, pte);
279 __update_cache(vma, address, pte);
280}
281
282#ifndef __ASSEMBLY__
283#include <asm-generic/pgtable.h>
284
285void setup_memory(void);
286#endif /* __ASSEMBLY__ */
287
288#endif /* _ASM_SCORE_PGTABLE_H */