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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#define __ARCH_USE_5LEVEL_HACK
6#include <asm-generic/pgtable-nopmd.h>
7
8#include <asm/fixmap.h>
9#include <asm/setup.h>
10#include <asm/pgtable-bits.h>
11
12extern void load_pgd(unsigned long pg_dir);
13extern pte_t invalid_pte_table[PAGE_SIZE/sizeof(pte_t)];
14
15/* PGDIR_SHIFT determines what a third-level page table entry can map */
16#define PGDIR_SHIFT 22
17#define PGDIR_SIZE (_AC(1, UL) << PGDIR_SHIFT)
18#define PGDIR_MASK (~(PGDIR_SIZE - 1))
19
20/*
21 * Entries per page directory level: we use two-level, so
22 * we don't really have any PUD/PMD directory physically.
23 */
24#define PGD_ORDER 0
25#define PTE_ORDER 0
26
27#define PTRS_PER_PGD 1024
28#define PTRS_PER_PTE 1024
29
30#define USER_PTRS_PER_PGD (0x80000000UL/PGDIR_SIZE)
31#define FIRST_USER_ADDRESS 0UL
32
33#define VMALLOC_START (0xc0000000UL)
34
35#define PKMAP_BASE (0xfd000000UL)
36
37#define VMALLOC_END (FIXADDR_START - 2*PAGE_SIZE)
38
39#define pte_ERROR(e) \
40 printk(KERN_ERR "%s:%d: bad pte %08lx.\n", \
41 __FILE__, __LINE__, pte_val(e))
42#define pgd_ERROR(e) \
43 printk(KERN_ERR "%s:%d: bad pgd %08lx.\n", \
44 __FILE__, __LINE__, pgd_val(e))
45
46/*
47 * Empty pgd/pmd entries point to the invalid_pte_table.
48 */
49static inline int pmd_none(pmd_t pmd)
50{
51 return pmd_val(pmd) == (unsigned long) invalid_pte_table;
52}
53
54#define pmd_bad(pmd) (pmd_val(pmd) & ~PAGE_MASK)
55
56static inline int pmd_present(pmd_t pmd)
57{
58 return pmd_val(pmd) != (unsigned long) invalid_pte_table;
59}
60
61static inline void pmd_clear(pmd_t *pmdp)
62{
63 pmd_val(*pmdp) = ((unsigned long) invalid_pte_table);
64}
65
66#define pte_page(x) pfn_to_page(pte_pfn(x))
67#define pte_pfn(x) ((unsigned long)((x).pte >> PAGE_SHIFT))
68#define pfn_pte(pfn, prot) \
69 __pte(((unsigned long long)(pfn) << PAGE_SHIFT) | pgprot_val(prot))
70
71#define __pgd_offset(address) pgd_index(address)
72#define __pud_offset(address) (((address) >> PUD_SHIFT) & (PTRS_PER_PUD-1))
73#define __pmd_offset(address) (((address) >> PMD_SHIFT) & (PTRS_PER_PMD-1))
74
75/* to find an entry in a kernel page-table-directory */
76#define pgd_offset_k(address) pgd_offset(&init_mm, address)
77#define pgd_index(address) (((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD-1))
78
79/* to find an entry in a page-table-directory */
80#define pgd_offset(mm, addr) ((mm)->pgd + pgd_index(addr))
81
82/* Find an entry in the third-level page table.. */
83#define __pte_offset(address) \
84 (((address) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1))
85#define pte_offset(dir, address) \
86 ((pte_t *) pmd_page_vaddr(*(dir)) + __pte_offset(address))
87#define pte_offset_kernel(dir, address) \
88 ((pte_t *) pmd_page_vaddr(*(dir)) + __pte_offset(address))
89
90#define pte_offset_map(dir, address) \
91 ((pte_t *)page_address(pmd_page(*(dir))) + __pte_offset(address))
92#define pte_unmap(pte) ((void)(pte))
93
94#define __pte_to_swp_entry(pte) \
95 ((swp_entry_t) { pte_val(pte)})
96#define __swp_entry_to_pte(x) ((pte_t) {(x).val})
97
98#define pmd_phys(pmd) __pa((void *)pmd_val(pmd))
99#define pmd_page(pmd) (pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT))
100#define mk_pte(page, prot) pfn_pte(page_to_pfn(page), prot)
101static inline pte_t pte_mkspecial(pte_t pte) { return pte; }
102
103#define set_pte(pteptr, pteval) (*(pteptr) = pteval)
104#define set_pte_at(mm, addr, ptep, pteval) set_pte(ptep, pteval)
105#define pte_clear(mm, addr, xp) \
106 do { set_pte_at(mm, addr, xp, __pte(0)); } while (0)
107
108/*
109 * The "pgd_xxx()" functions here are trivial for a folded two-level
110 * setup: the pgd is never bad, and a pmd always exists (as it's folded
111 * into the pgd entry)
112 */
113#define pgd_present(pgd) (1)
114#define pgd_none(pgd) (0)
115#define pgd_bad(pgd) (0)
116#define pgd_clear(pgdp) do { } while (0)
117
118#define kern_addr_valid(addr) (1)
119#define pmd_page_vaddr(pmd) pmd_val(pmd)
120
121#define pte_none(pte) (!(pte_val(pte) & ~_PAGE_GLOBAL))
122#define pte_present(pte) (pte_val(pte) & _PAGE_PRESENT)
123
124#define PAGE_NONE __pgprot(_PAGE_PRESENT | _PAGE_CACHE)
125#define PAGE_SHARED __pgprot(_PAGE_PRESENT | _PAGE_READ | _PAGE_WRITE | \
126 _PAGE_CACHE)
127#define PAGE_COPY __pgprot(_PAGE_PRESENT | _PAGE_READ | _PAGE_CACHE)
128#define PAGE_READONLY __pgprot(_PAGE_PRESENT | _PAGE_READ | _PAGE_CACHE)
129#define PAGE_KERNEL __pgprot(_PAGE_PRESENT | __READABLE | __WRITEABLE | \
130 _PAGE_GLOBAL | _PAGE_CACHE)
131#define PAGE_KERNEL_UNCACHED __pgprot(_PAGE_PRESENT | __READABLE | \
132 __WRITEABLE | _PAGE_GLOBAL & ~_PAGE_CACHE)
133
134#define __P000 PAGE_NONE
135#define __P001 PAGE_READONLY
136#define __P010 PAGE_COPY
137#define __P011 PAGE_COPY
138#define __P100 PAGE_READONLY
139#define __P101 PAGE_READONLY
140#define __P110 PAGE_COPY
141#define __P111 PAGE_COPY
142
143#define __S000 PAGE_NONE
144#define __S001 PAGE_READONLY
145#define __S010 PAGE_SHARED
146#define __S011 PAGE_SHARED
147#define __S100 PAGE_READONLY
148#define __S101 PAGE_READONLY
149#define __S110 PAGE_SHARED
150#define __S111 PAGE_SHARED
151
152#define pgprot_noncached pgprot_noncached
153
154static inline pgprot_t pgprot_noncached(pgprot_t _prot)
155{
156 unsigned long prot = pgprot_val(_prot);
157
158 prot = (prot & ~_CACHE_MASK);
159
160 return __pgprot(prot);
161}
162
163#define __swp_type(x) ((x).val & 0x1f)
164#define __swp_offset(x) ((x).val >> 10)
165#define __swp_entry(type, offset) ((swp_entry_t){(type) | ((offset) << 10)})
166
167extern unsigned long empty_zero_page;
168extern unsigned long zero_page_mask;
169
170#define ZERO_PAGE(vaddr) \
171 (virt_to_page((void *)(empty_zero_page + \
172 (((unsigned long)(vaddr)) & zero_page_mask))))
173
174#define pgtable_cache_init() do {} while (0)
175
176#define arch_enter_lazy_cpu_mode() do {} while (0)
177
178static inline int pte_write(pte_t pte)
179{
180 return pte_val(pte) & _PAGE_WRITE;
181}
182
183static inline int pte_dirty(pte_t pte)
184{
185 return pte_val(pte) & _PAGE_MODIFIED;
186}
187
188static inline int pte_young(pte_t pte)
189{
190 return pte_val(pte) & _PAGE_ACCESSED;
191}
192
193#define pte_special(pte) (0)
194
195static inline pte_t pte_wrprotect(pte_t pte)
196{
197 pte_val(pte) &= ~(_PAGE_WRITE | _PAGE_SILENT_WRITE);
198 return pte;
199}
200
201static inline pte_t pte_mkclean(pte_t pte)
202{
203 pte_val(pte) &= ~(_PAGE_MODIFIED|_PAGE_SILENT_WRITE);
204 return pte;
205}
206
207static inline pte_t pte_mkold(pte_t pte)
208{
209 pte_val(pte) &= ~(_PAGE_ACCESSED|_PAGE_SILENT_READ);
210 return pte;
211}
212
213static inline pte_t pte_mkwrite(pte_t pte)
214{
215 pte_val(pte) |= _PAGE_WRITE;
216 if (pte_val(pte) & _PAGE_MODIFIED)
217 pte_val(pte) |= _PAGE_SILENT_WRITE;
218 return pte;
219}
220
221static inline pte_t pte_mkdirty(pte_t pte)
222{
223 pte_val(pte) |= _PAGE_MODIFIED;
224 if (pte_val(pte) & _PAGE_WRITE)
225 pte_val(pte) |= _PAGE_SILENT_WRITE;
226 return pte;
227}
228
229static inline pte_t pte_mkyoung(pte_t pte)
230{
231 pte_val(pte) |= _PAGE_ACCESSED;
232 if (pte_val(pte) & _PAGE_READ)
233 pte_val(pte) |= _PAGE_SILENT_READ;
234 return pte;
235}
236
237#define set_pmd(pmdptr, pmdval) \
238 do { *(pmdptr) = (pmdval); } while (0)
239#define pte_present(pte) (pte_val(pte) & _PAGE_PRESENT)
240
241extern unsigned long pgd_current;
242extern pgd_t swapper_pg_dir[PTRS_PER_PGD];
243extern void paging_init(void);
244
245static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
246{
247 return __pte((pte_val(pte) & _PAGE_CHG_MASK) | pgprot_val(newprot));
248}
249
250extern void __update_tlb(struct vm_area_struct *vma,
251 unsigned long address, pte_t pte);
252extern void __update_cache(struct vm_area_struct *vma,
253 unsigned long address, pte_t pte);
254
255static inline void update_mmu_cache(struct vm_area_struct *vma,
256 unsigned long address, pte_t *ptep)
257{
258 pte_t pte = *ptep;
259 __update_tlb(vma, address, pte);
260 __update_cache(vma, address, pte);
261}
262
263#ifndef __ASSEMBLY__
264#include <asm-generic/pgtable.h>
265
266void setup_memory(void);
267#endif /* __ASSEMBLY__ */
268
269#endif /* _ASM_SCORE_PGTABLE_H */