1
2
3
4
5
6
7
8
9
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#include <asm-generic/pgtable-nopud.h>
24#include <asm/memory.h>
25#include <asm/pgtable-hwdef.h>
26
27#ifdef CONFIG_ARM_LPAE
28#include <asm/pgtable-3level.h>
29#else
30#include <asm/pgtable-2level.h>
31#endif
32
33
34
35
36
37
38
39
40
41#define VMALLOC_OFFSET (8*1024*1024)
42#define VMALLOC_START (((unsigned long)high_memory + VMALLOC_OFFSET) & ~(VMALLOC_OFFSET-1))
43#define VMALLOC_END 0xff000000UL
44
45#define LIBRARY_TEXT_START 0x0c000000
46
47#ifndef __ASSEMBLY__
48extern void __pte_error(const char *file, int line, pte_t);
49extern void __pmd_error(const char *file, int line, pmd_t);
50extern void __pgd_error(const char *file, int line, pgd_t);
51
52#define pte_ERROR(pte) __pte_error(__FILE__, __LINE__, pte)
53#define pmd_ERROR(pmd) __pmd_error(__FILE__, __LINE__, pmd)
54#define pgd_ERROR(pgd) __pgd_error(__FILE__, __LINE__, pgd)
55
56
57
58
59
60
61#define FIRST_USER_ADDRESS (PAGE_SIZE * 2)
62
63
64
65
66
67
68#ifdef CONFIG_ARM_LPAE
69#define USER_PGTABLES_CEILING TASK_SIZE
70#endif
71
72
73
74
75
76
77
78#define _L_PTE_DEFAULT L_PTE_PRESENT | L_PTE_YOUNG
79
80extern pgprot_t pgprot_user;
81extern pgprot_t pgprot_kernel;
82extern pgprot_t pgprot_hyp_device;
83extern pgprot_t pgprot_s2;
84extern pgprot_t pgprot_s2_device;
85
86#define _MOD_PROT(p, b) __pgprot(pgprot_val(p) | (b))
87
88#define PAGE_NONE _MOD_PROT(pgprot_user, L_PTE_XN | L_PTE_RDONLY | L_PTE_NONE)
89#define PAGE_SHARED _MOD_PROT(pgprot_user, L_PTE_USER | L_PTE_XN)
90#define PAGE_SHARED_EXEC _MOD_PROT(pgprot_user, L_PTE_USER)
91#define PAGE_COPY _MOD_PROT(pgprot_user, L_PTE_USER | L_PTE_RDONLY | L_PTE_XN)
92#define PAGE_COPY_EXEC _MOD_PROT(pgprot_user, L_PTE_USER | L_PTE_RDONLY)
93#define PAGE_READONLY _MOD_PROT(pgprot_user, L_PTE_USER | L_PTE_RDONLY | L_PTE_XN)
94#define PAGE_READONLY_EXEC _MOD_PROT(pgprot_user, L_PTE_USER | L_PTE_RDONLY)
95#define PAGE_KERNEL _MOD_PROT(pgprot_kernel, L_PTE_XN)
96#define PAGE_KERNEL_EXEC pgprot_kernel
97#define PAGE_HYP _MOD_PROT(pgprot_kernel, L_PTE_HYP)
98#define PAGE_HYP_DEVICE _MOD_PROT(pgprot_hyp_device, L_PTE_HYP)
99#define PAGE_S2 _MOD_PROT(pgprot_s2, L_PTE_S2_RDONLY)
100#define PAGE_S2_DEVICE _MOD_PROT(pgprot_s2_device, L_PTE_USER | L_PTE_S2_RDONLY)
101
102#define __PAGE_NONE __pgprot(_L_PTE_DEFAULT | L_PTE_RDONLY | L_PTE_XN | L_PTE_NONE)
103#define __PAGE_SHARED __pgprot(_L_PTE_DEFAULT | L_PTE_USER | L_PTE_XN)
104#define __PAGE_SHARED_EXEC __pgprot(_L_PTE_DEFAULT | L_PTE_USER)
105#define __PAGE_COPY __pgprot(_L_PTE_DEFAULT | L_PTE_USER | L_PTE_RDONLY | L_PTE_XN)
106#define __PAGE_COPY_EXEC __pgprot(_L_PTE_DEFAULT | L_PTE_USER | L_PTE_RDONLY)
107#define __PAGE_READONLY __pgprot(_L_PTE_DEFAULT | L_PTE_USER | L_PTE_RDONLY | L_PTE_XN)
108#define __PAGE_READONLY_EXEC __pgprot(_L_PTE_DEFAULT | L_PTE_USER | L_PTE_RDONLY)
109
110#define __pgprot_modify(prot,mask,bits) \
111 __pgprot((pgprot_val(prot) & ~(mask)) | (bits))
112
113#define pgprot_noncached(prot) \
114 __pgprot_modify(prot, L_PTE_MT_MASK, L_PTE_MT_UNCACHED)
115
116#define pgprot_writecombine(prot) \
117 __pgprot_modify(prot, L_PTE_MT_MASK, L_PTE_MT_BUFFERABLE)
118
119#define pgprot_stronglyordered(prot) \
120 __pgprot_modify(prot, L_PTE_MT_MASK, L_PTE_MT_UNCACHED)
121
122#ifdef CONFIG_ARM_DMA_MEM_BUFFERABLE
123#define pgprot_dmacoherent(prot) \
124 __pgprot_modify(prot, L_PTE_MT_MASK, L_PTE_MT_BUFFERABLE | L_PTE_XN)
125#define __HAVE_PHYS_MEM_ACCESS_PROT
126struct file;
127extern pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,
128 unsigned long size, pgprot_t vma_prot);
129#else
130#define pgprot_dmacoherent(prot) \
131 __pgprot_modify(prot, L_PTE_MT_MASK, L_PTE_MT_UNCACHED | L_PTE_XN)
132#endif
133
134#endif
135
136
137
138
139
140
141
142
143
144#define __P000 __PAGE_NONE
145#define __P001 __PAGE_READONLY
146#define __P010 __PAGE_COPY
147#define __P011 __PAGE_COPY
148#define __P100 __PAGE_READONLY_EXEC
149#define __P101 __PAGE_READONLY_EXEC
150#define __P110 __PAGE_COPY_EXEC
151#define __P111 __PAGE_COPY_EXEC
152
153#define __S000 __PAGE_NONE
154#define __S001 __PAGE_READONLY
155#define __S010 __PAGE_SHARED
156#define __S011 __PAGE_SHARED
157#define __S100 __PAGE_READONLY_EXEC
158#define __S101 __PAGE_READONLY_EXEC
159#define __S110 __PAGE_SHARED_EXEC
160#define __S111 __PAGE_SHARED_EXEC
161
162#ifndef __ASSEMBLY__
163
164
165
166
167extern struct page *empty_zero_page;
168#define ZERO_PAGE(vaddr) (empty_zero_page)
169
170
171extern pgd_t swapper_pg_dir[PTRS_PER_PGD];
172
173
174#define pgd_index(addr) ((addr) >> PGDIR_SHIFT)
175
176#define pgd_offset(mm, addr) ((mm)->pgd + pgd_index(addr))
177
178
179#define pgd_offset_k(addr) pgd_offset(&init_mm, addr)
180
181#define pmd_none(pmd) (!pmd_val(pmd))
182#define pmd_present(pmd) (pmd_val(pmd))
183
184static inline pte_t *pmd_page_vaddr(pmd_t pmd)
185{
186 return __va(pmd_val(pmd) & PHYS_MASK & (s32)PAGE_MASK);
187}
188
189#define pmd_page(pmd) pfn_to_page(__phys_to_pfn(pmd_val(pmd) & PHYS_MASK))
190
191#ifndef CONFIG_HIGHPTE
192#define __pte_map(pmd) pmd_page_vaddr(*(pmd))
193#define __pte_unmap(pte) do { } while (0)
194#else
195#define __pte_map(pmd) (pte_t *)kmap_atomic(pmd_page(*(pmd)))
196#define __pte_unmap(pte) kunmap_atomic(pte)
197#endif
198
199#define pte_index(addr) (((addr) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1))
200
201#define pte_offset_kernel(pmd,addr) (pmd_page_vaddr(*(pmd)) + pte_index(addr))
202
203#define pte_offset_map(pmd,addr) (__pte_map(pmd) + pte_index(addr))
204#define pte_unmap(pte) __pte_unmap(pte)
205
206#define pte_pfn(pte) ((pte_val(pte) & PHYS_MASK) >> PAGE_SHIFT)
207#define pfn_pte(pfn,prot) __pte(__pfn_to_phys(pfn) | pgprot_val(prot))
208
209#define pte_page(pte) pfn_to_page(pte_pfn(pte))
210#define mk_pte(page,prot) pfn_pte(page_to_pfn(page), prot)
211
212#define pte_clear(mm,addr,ptep) set_pte_ext(ptep, __pte(0), 0)
213
214#define pte_none(pte) (!pte_val(pte))
215#define pte_present(pte) (pte_val(pte) & L_PTE_PRESENT)
216#define pte_write(pte) (!(pte_val(pte) & L_PTE_RDONLY))
217#define pte_dirty(pte) (pte_val(pte) & L_PTE_DIRTY)
218#define pte_young(pte) (pte_val(pte) & L_PTE_YOUNG)
219#define pte_exec(pte) (!(pte_val(pte) & L_PTE_XN))
220#define pte_special(pte) (0)
221
222#define pte_present_user(pte) (pte_present(pte) && (pte_val(pte) & L_PTE_USER))
223
224#if __LINUX_ARM_ARCH__ < 6
225static inline void __sync_icache_dcache(pte_t pteval)
226{
227}
228#else
229extern void __sync_icache_dcache(pte_t pteval);
230#endif
231
232static inline void set_pte_at(struct mm_struct *mm, unsigned long addr,
233 pte_t *ptep, pte_t pteval)
234{
235 unsigned long ext = 0;
236
237 if (addr < TASK_SIZE && pte_present_user(pteval)) {
238 __sync_icache_dcache(pteval);
239 ext |= PTE_EXT_NG;
240 }
241
242 set_pte_ext(ptep, pteval, ext);
243}
244
245#define PTE_BIT_FUNC(fn,op) \
246static inline pte_t pte_##fn(pte_t pte) { pte_val(pte) op; return pte; }
247
248PTE_BIT_FUNC(wrprotect, |= L_PTE_RDONLY);
249PTE_BIT_FUNC(mkwrite, &= ~L_PTE_RDONLY);
250PTE_BIT_FUNC(mkclean, &= ~L_PTE_DIRTY);
251PTE_BIT_FUNC(mkdirty, |= L_PTE_DIRTY);
252PTE_BIT_FUNC(mkold, &= ~L_PTE_YOUNG);
253PTE_BIT_FUNC(mkyoung, |= L_PTE_YOUNG);
254
255static inline pte_t pte_mkspecial(pte_t pte) { return pte; }
256
257static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
258{
259 const pteval_t mask = L_PTE_XN | L_PTE_RDONLY | L_PTE_USER |
260 L_PTE_NONE | L_PTE_VALID;
261 pte_val(pte) = (pte_val(pte) & ~mask) | (pgprot_val(newprot) & mask);
262 return pte;
263}
264
265
266
267
268
269
270
271
272
273
274
275
276#define __SWP_TYPE_SHIFT 3
277#define __SWP_TYPE_BITS 5
278#define __SWP_TYPE_MASK ((1 << __SWP_TYPE_BITS) - 1)
279#define __SWP_OFFSET_SHIFT (__SWP_TYPE_BITS + __SWP_TYPE_SHIFT)
280
281#define __swp_type(x) (((x).val >> __SWP_TYPE_SHIFT) & __SWP_TYPE_MASK)
282#define __swp_offset(x) ((x).val >> __SWP_OFFSET_SHIFT)
283#define __swp_entry(type,offset) ((swp_entry_t) { ((type) << __SWP_TYPE_SHIFT) | ((offset) << __SWP_OFFSET_SHIFT) })
284
285#define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) })
286#define __swp_entry_to_pte(swp) ((pte_t) { (swp).val })
287
288
289
290
291
292
293#define MAX_SWAPFILES_CHECK() BUILD_BUG_ON(MAX_SWAPFILES_SHIFT > __SWP_TYPE_BITS)
294
295
296
297
298
299
300
301
302
303#define pte_file(pte) (pte_val(pte) & L_PTE_FILE)
304#define pte_to_pgoff(x) (pte_val(x) >> 3)
305#define pgoff_to_pte(x) __pte(((x) << 3) | L_PTE_FILE)
306
307#define PTE_FILE_MAX_BITS 29
308
309
310
311#define kern_addr_valid(addr) (1)
312
313#include <asm-generic/pgtable.h>
314
315
316
317
318#define HAVE_ARCH_UNMAPPED_AREA
319#define HAVE_ARCH_UNMAPPED_AREA_TOPDOWN
320
321
322
323
324
325#define io_remap_pfn_range(vma,from,pfn,size,prot) \
326 remap_pfn_range(vma, from, pfn, size, prot)
327
328#define pgtable_cache_init() do { } while (0)
329
330#endif
331
332#endif
333
334#endif
335