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10#ifndef _ASMARM_PGTABLE_H
11#define _ASMARM_PGTABLE_H
12
13#include <linux/const.h>
14#include <asm/proc-fns.h>
15
16#ifndef CONFIG_MMU
17
18#include <asm-generic/4level-fixup.h>
19#include <asm/pgtable-nommu.h>
20
21#else
22
23#define __ARCH_USE_5LEVEL_HACK
24#include <asm-generic/pgtable-nopud.h>
25#include <asm/memory.h>
26#include <asm/pgtable-hwdef.h>
27
28
29#include <asm/tlbflush.h>
30
31#ifdef CONFIG_ARM_LPAE
32#include <asm/pgtable-3level.h>
33#else
34#include <asm/pgtable-2level.h>
35#endif
36
37
38
39
40
41
42
43
44
45#define VMALLOC_OFFSET (8*1024*1024)
46#define VMALLOC_START (((unsigned long)high_memory + VMALLOC_OFFSET) & ~(VMALLOC_OFFSET-1))
47#define VMALLOC_END 0xff800000UL
48
49#define LIBRARY_TEXT_START 0x0c000000
50
51#ifndef __ASSEMBLY__
52extern void __pte_error(const char *file, int line, pte_t);
53extern void __pmd_error(const char *file, int line, pmd_t);
54extern void __pgd_error(const char *file, int line, pgd_t);
55
56#define pte_ERROR(pte) __pte_error(__FILE__, __LINE__, pte)
57#define pmd_ERROR(pmd) __pmd_error(__FILE__, __LINE__, pmd)
58#define pgd_ERROR(pgd) __pgd_error(__FILE__, __LINE__, pgd)
59
60
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62
63
64
65#define FIRST_USER_ADDRESS (PAGE_SIZE * 2)
66
67
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69
70
71
72#ifdef CONFIG_ARM_LPAE
73#define USER_PGTABLES_CEILING TASK_SIZE
74#endif
75
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80
81
82#define _L_PTE_DEFAULT L_PTE_PRESENT | L_PTE_YOUNG
83
84extern pgprot_t pgprot_user;
85extern pgprot_t pgprot_kernel;
86extern pgprot_t pgprot_hyp_device;
87extern pgprot_t pgprot_s2;
88extern pgprot_t pgprot_s2_device;
89
90#define _MOD_PROT(p, b) __pgprot(pgprot_val(p) | (b))
91
92#define PAGE_NONE _MOD_PROT(pgprot_user, L_PTE_XN | L_PTE_RDONLY | L_PTE_NONE)
93#define PAGE_SHARED _MOD_PROT(pgprot_user, L_PTE_USER | L_PTE_XN)
94#define PAGE_SHARED_EXEC _MOD_PROT(pgprot_user, L_PTE_USER)
95#define PAGE_COPY _MOD_PROT(pgprot_user, L_PTE_USER | L_PTE_RDONLY | L_PTE_XN)
96#define PAGE_COPY_EXEC _MOD_PROT(pgprot_user, L_PTE_USER | L_PTE_RDONLY)
97#define PAGE_READONLY _MOD_PROT(pgprot_user, L_PTE_USER | L_PTE_RDONLY | L_PTE_XN)
98#define PAGE_READONLY_EXEC _MOD_PROT(pgprot_user, L_PTE_USER | L_PTE_RDONLY)
99#define PAGE_KERNEL _MOD_PROT(pgprot_kernel, L_PTE_XN)
100#define PAGE_KERNEL_EXEC pgprot_kernel
101#define PAGE_HYP _MOD_PROT(pgprot_kernel, L_PTE_HYP | L_PTE_XN)
102#define PAGE_HYP_EXEC _MOD_PROT(pgprot_kernel, L_PTE_HYP | L_PTE_RDONLY)
103#define PAGE_HYP_RO _MOD_PROT(pgprot_kernel, L_PTE_HYP | L_PTE_RDONLY | L_PTE_XN)
104#define PAGE_HYP_DEVICE _MOD_PROT(pgprot_hyp_device, L_PTE_HYP)
105#define PAGE_S2 _MOD_PROT(pgprot_s2, L_PTE_S2_RDONLY)
106#define PAGE_S2_DEVICE _MOD_PROT(pgprot_s2_device, L_PTE_S2_RDONLY)
107
108#define __PAGE_NONE __pgprot(_L_PTE_DEFAULT | L_PTE_RDONLY | L_PTE_XN | L_PTE_NONE)
109#define __PAGE_SHARED __pgprot(_L_PTE_DEFAULT | L_PTE_USER | L_PTE_XN)
110#define __PAGE_SHARED_EXEC __pgprot(_L_PTE_DEFAULT | L_PTE_USER)
111#define __PAGE_COPY __pgprot(_L_PTE_DEFAULT | L_PTE_USER | L_PTE_RDONLY | L_PTE_XN)
112#define __PAGE_COPY_EXEC __pgprot(_L_PTE_DEFAULT | L_PTE_USER | L_PTE_RDONLY)
113#define __PAGE_READONLY __pgprot(_L_PTE_DEFAULT | L_PTE_USER | L_PTE_RDONLY | L_PTE_XN)
114#define __PAGE_READONLY_EXEC __pgprot(_L_PTE_DEFAULT | L_PTE_USER | L_PTE_RDONLY)
115
116#define __pgprot_modify(prot,mask,bits) \
117 __pgprot((pgprot_val(prot) & ~(mask)) | (bits))
118
119#define pgprot_noncached(prot) \
120 __pgprot_modify(prot, L_PTE_MT_MASK, L_PTE_MT_UNCACHED)
121
122#define pgprot_writecombine(prot) \
123 __pgprot_modify(prot, L_PTE_MT_MASK, L_PTE_MT_BUFFERABLE)
124
125#define pgprot_stronglyordered(prot) \
126 __pgprot_modify(prot, L_PTE_MT_MASK, L_PTE_MT_UNCACHED)
127
128#ifdef CONFIG_ARM_DMA_MEM_BUFFERABLE
129#define pgprot_dmacoherent(prot) \
130 __pgprot_modify(prot, L_PTE_MT_MASK, L_PTE_MT_BUFFERABLE | L_PTE_XN)
131#define __HAVE_PHYS_MEM_ACCESS_PROT
132struct file;
133extern pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,
134 unsigned long size, pgprot_t vma_prot);
135#else
136#define pgprot_dmacoherent(prot) \
137 __pgprot_modify(prot, L_PTE_MT_MASK, L_PTE_MT_UNCACHED | L_PTE_XN)
138#endif
139
140#endif
141
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149
150#define __P000 __PAGE_NONE
151#define __P001 __PAGE_READONLY
152#define __P010 __PAGE_COPY
153#define __P011 __PAGE_COPY
154#define __P100 __PAGE_READONLY_EXEC
155#define __P101 __PAGE_READONLY_EXEC
156#define __P110 __PAGE_COPY_EXEC
157#define __P111 __PAGE_COPY_EXEC
158
159#define __S000 __PAGE_NONE
160#define __S001 __PAGE_READONLY
161#define __S010 __PAGE_SHARED
162#define __S011 __PAGE_SHARED
163#define __S100 __PAGE_READONLY_EXEC
164#define __S101 __PAGE_READONLY_EXEC
165#define __S110 __PAGE_SHARED_EXEC
166#define __S111 __PAGE_SHARED_EXEC
167
168#ifndef __ASSEMBLY__
169
170
171
172
173extern struct page *empty_zero_page;
174#define ZERO_PAGE(vaddr) (empty_zero_page)
175
176
177extern pgd_t swapper_pg_dir[PTRS_PER_PGD];
178
179
180#define pgd_index(addr) ((addr) >> PGDIR_SHIFT)
181
182#define pgd_offset(mm, addr) ((mm)->pgd + pgd_index(addr))
183
184
185#define pgd_offset_k(addr) pgd_offset(&init_mm, addr)
186
187#define pmd_none(pmd) (!pmd_val(pmd))
188
189static inline pte_t *pmd_page_vaddr(pmd_t pmd)
190{
191 return __va(pmd_val(pmd) & PHYS_MASK & (s32)PAGE_MASK);
192}
193
194#define pmd_page(pmd) pfn_to_page(__phys_to_pfn(pmd_val(pmd) & PHYS_MASK))
195
196#ifndef CONFIG_HIGHPTE
197#define __pte_map(pmd) pmd_page_vaddr(*(pmd))
198#define __pte_unmap(pte) do { } while (0)
199#else
200#define __pte_map(pmd) (pte_t *)kmap_atomic(pmd_page(*(pmd)))
201#define __pte_unmap(pte) kunmap_atomic(pte)
202#endif
203
204#define pte_index(addr) (((addr) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1))
205
206#define pte_offset_kernel(pmd,addr) (pmd_page_vaddr(*(pmd)) + pte_index(addr))
207
208#define pte_offset_map(pmd,addr) (__pte_map(pmd) + pte_index(addr))
209#define pte_unmap(pte) __pte_unmap(pte)
210
211#define pte_pfn(pte) ((pte_val(pte) & PHYS_MASK) >> PAGE_SHIFT)
212#define pfn_pte(pfn,prot) __pte(__pfn_to_phys(pfn) | pgprot_val(prot))
213
214#define pte_page(pte) pfn_to_page(pte_pfn(pte))
215#define mk_pte(page,prot) pfn_pte(page_to_pfn(page), prot)
216
217#define pte_clear(mm,addr,ptep) set_pte_ext(ptep, __pte(0), 0)
218
219#define pte_isset(pte, val) ((u32)(val) == (val) ? pte_val(pte) & (val) \
220 : !!(pte_val(pte) & (val)))
221#define pte_isclear(pte, val) (!(pte_val(pte) & (val)))
222
223#define pte_none(pte) (!pte_val(pte))
224#define pte_present(pte) (pte_isset((pte), L_PTE_PRESENT))
225#define pte_valid(pte) (pte_isset((pte), L_PTE_VALID))
226#define pte_accessible(mm, pte) (mm_tlb_flush_pending(mm) ? pte_present(pte) : pte_valid(pte))
227#define pte_write(pte) (pte_isclear((pte), L_PTE_RDONLY))
228#define pte_dirty(pte) (pte_isset((pte), L_PTE_DIRTY))
229#define pte_young(pte) (pte_isset((pte), L_PTE_YOUNG))
230#define pte_exec(pte) (pte_isclear((pte), L_PTE_XN))
231
232#define pte_valid_user(pte) \
233 (pte_valid(pte) && pte_isset((pte), L_PTE_USER) && pte_young(pte))
234
235#if __LINUX_ARM_ARCH__ < 6
236static inline void __sync_icache_dcache(pte_t pteval)
237{
238}
239#else
240extern void __sync_icache_dcache(pte_t pteval);
241#endif
242
243static inline void set_pte_at(struct mm_struct *mm, unsigned long addr,
244 pte_t *ptep, pte_t pteval)
245{
246 unsigned long ext = 0;
247
248 if (addr < TASK_SIZE && pte_valid_user(pteval)) {
249 if (!pte_special(pteval))
250 __sync_icache_dcache(pteval);
251 ext |= PTE_EXT_NG;
252 }
253
254 set_pte_ext(ptep, pteval, ext);
255}
256
257static inline pte_t clear_pte_bit(pte_t pte, pgprot_t prot)
258{
259 pte_val(pte) &= ~pgprot_val(prot);
260 return pte;
261}
262
263static inline pte_t set_pte_bit(pte_t pte, pgprot_t prot)
264{
265 pte_val(pte) |= pgprot_val(prot);
266 return pte;
267}
268
269static inline pte_t pte_wrprotect(pte_t pte)
270{
271 return set_pte_bit(pte, __pgprot(L_PTE_RDONLY));
272}
273
274static inline pte_t pte_mkwrite(pte_t pte)
275{
276 return clear_pte_bit(pte, __pgprot(L_PTE_RDONLY));
277}
278
279static inline pte_t pte_mkclean(pte_t pte)
280{
281 return clear_pte_bit(pte, __pgprot(L_PTE_DIRTY));
282}
283
284static inline pte_t pte_mkdirty(pte_t pte)
285{
286 return set_pte_bit(pte, __pgprot(L_PTE_DIRTY));
287}
288
289static inline pte_t pte_mkold(pte_t pte)
290{
291 return clear_pte_bit(pte, __pgprot(L_PTE_YOUNG));
292}
293
294static inline pte_t pte_mkyoung(pte_t pte)
295{
296 return set_pte_bit(pte, __pgprot(L_PTE_YOUNG));
297}
298
299static inline pte_t pte_mkexec(pte_t pte)
300{
301 return clear_pte_bit(pte, __pgprot(L_PTE_XN));
302}
303
304static inline pte_t pte_mknexec(pte_t pte)
305{
306 return set_pte_bit(pte, __pgprot(L_PTE_XN));
307}
308
309static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
310{
311 const pteval_t mask = L_PTE_XN | L_PTE_RDONLY | L_PTE_USER |
312 L_PTE_NONE | L_PTE_VALID;
313 pte_val(pte) = (pte_val(pte) & ~mask) | (pgprot_val(newprot) & mask);
314 return pte;
315}
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326
327
328#define __SWP_TYPE_SHIFT 2
329#define __SWP_TYPE_BITS 5
330#define __SWP_TYPE_MASK ((1 << __SWP_TYPE_BITS) - 1)
331#define __SWP_OFFSET_SHIFT (__SWP_TYPE_BITS + __SWP_TYPE_SHIFT)
332
333#define __swp_type(x) (((x).val >> __SWP_TYPE_SHIFT) & __SWP_TYPE_MASK)
334#define __swp_offset(x) ((x).val >> __SWP_OFFSET_SHIFT)
335#define __swp_entry(type,offset) ((swp_entry_t) { ((type) << __SWP_TYPE_SHIFT) | ((offset) << __SWP_OFFSET_SHIFT) })
336
337#define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) })
338#define __swp_entry_to_pte(swp) ((pte_t) { (swp).val })
339
340
341
342
343
344
345#define MAX_SWAPFILES_CHECK() BUILD_BUG_ON(MAX_SWAPFILES_SHIFT > __SWP_TYPE_BITS)
346
347
348
349#define kern_addr_valid(addr) (1)
350
351#include <asm-generic/pgtable.h>
352
353
354
355
356#define HAVE_ARCH_UNMAPPED_AREA
357#define HAVE_ARCH_UNMAPPED_AREA_TOPDOWN
358
359#define pgtable_cache_init() do { } while (0)
360
361#endif
362
363#endif
364
365#endif
366