2 * arch/arm/include/asm/pgtable.h
4 * Copyright (C) 1995-2002 Russell King
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
10 #ifndef _ASMARM_PGTABLE_H
11 #define _ASMARM_PGTABLE_H
13 #include <linux/const.h>
14 #include <asm/proc-fns.h>
18 #include <asm-generic/4level-fixup.h>
19 #include "pgtable-nommu.h"
23 #include <asm-generic/pgtable-nopud.h>
24 #include <asm/memory.h>
25 #include <mach/vmalloc.h>
26 #include <asm/pgtable-hwdef.h>
28 #ifdef CONFIG_ARM_LPAE
29 #include <asm/pgtable-3level.h>
31 #include <asm/pgtable-2level.h>
35 * Just any arbitrary offset to the start of the vmalloc VM area: the
36 * current 8MB value just means that there will be a 8MB "hole" after the
37 * physical memory until the kernel virtual memory starts. That means that
38 * any out-of-bounds memory accesses will hopefully be caught.
39 * The vmalloc() routines leaves a hole of 4kB between each vmalloced
40 * area for the same reason. ;)
42 * Note that platforms may override VMALLOC_START, but they must provide
43 * VMALLOC_END. VMALLOC_END defines the (exclusive) limit of this space,
44 * which may not overlap IO space.
47 #define VMALLOC_OFFSET (8*1024*1024)
48 #define VMALLOC_START (((unsigned long)high_memory + VMALLOC_OFFSET) & ~(VMALLOC_OFFSET-1))
51 #define LIBRARY_TEXT_START 0x0c000000
54 extern void __pte_error(const char *file, int line, pte_t);
55 extern void __pmd_error(const char *file, int line, pmd_t);
56 extern void __pgd_error(const char *file, int line, pgd_t);
58 #define pte_ERROR(pte) __pte_error(__FILE__, __LINE__, pte)
59 #define pmd_ERROR(pmd) __pmd_error(__FILE__, __LINE__, pmd)
60 #define pgd_ERROR(pgd) __pgd_error(__FILE__, __LINE__, pgd)
63 * This is the lowest virtual address we can permit any user space
64 * mapping to be mapped at. This is particularly important for
65 * non-high vector CPUs.
67 #define FIRST_USER_ADDRESS PAGE_SIZE
70 * The pgprot_* and protection_map entries will be fixed up in runtime
71 * to include the cachable and bufferable bits based on memory policy,
72 * as well as any architecture dependent bits like global/ASID and SMP
73 * shared mapping bits.
75 #define _L_PTE_DEFAULT L_PTE_PRESENT | L_PTE_YOUNG
77 extern pgprot_t pgprot_user;
78 extern pgprot_t pgprot_kernel;
80 #define _MOD_PROT(p, b) __pgprot(pgprot_val(p) | (b))
82 #define PAGE_NONE _MOD_PROT(pgprot_user, L_PTE_XN | L_PTE_RDONLY)
83 #define PAGE_SHARED _MOD_PROT(pgprot_user, L_PTE_USER | L_PTE_XN)
84 #define PAGE_SHARED_EXEC _MOD_PROT(pgprot_user, L_PTE_USER)
85 #define PAGE_COPY _MOD_PROT(pgprot_user, L_PTE_USER | L_PTE_RDONLY | L_PTE_XN)
86 #define PAGE_COPY_EXEC _MOD_PROT(pgprot_user, L_PTE_USER | L_PTE_RDONLY)
87 #define PAGE_READONLY _MOD_PROT(pgprot_user, L_PTE_USER | L_PTE_RDONLY | L_PTE_XN)
88 #define PAGE_READONLY_EXEC _MOD_PROT(pgprot_user, L_PTE_USER | L_PTE_RDONLY)
89 #define PAGE_KERNEL _MOD_PROT(pgprot_kernel, L_PTE_XN)
90 #define PAGE_KERNEL_EXEC pgprot_kernel
92 #define __PAGE_NONE __pgprot(_L_PTE_DEFAULT | L_PTE_RDONLY | L_PTE_XN)
93 #define __PAGE_SHARED __pgprot(_L_PTE_DEFAULT | L_PTE_USER | L_PTE_XN)
94 #define __PAGE_SHARED_EXEC __pgprot(_L_PTE_DEFAULT | L_PTE_USER)
95 #define __PAGE_COPY __pgprot(_L_PTE_DEFAULT | L_PTE_USER | L_PTE_RDONLY | L_PTE_XN)
96 #define __PAGE_COPY_EXEC __pgprot(_L_PTE_DEFAULT | L_PTE_USER | L_PTE_RDONLY)
97 #define __PAGE_READONLY __pgprot(_L_PTE_DEFAULT | L_PTE_USER | L_PTE_RDONLY | L_PTE_XN)
98 #define __PAGE_READONLY_EXEC __pgprot(_L_PTE_DEFAULT | L_PTE_USER | L_PTE_RDONLY)
100 #define __pgprot_modify(prot,mask,bits) \
101 __pgprot((pgprot_val(prot) & ~(mask)) | (bits))
103 #define pgprot_noncached(prot) \
104 __pgprot_modify(prot, L_PTE_MT_MASK, L_PTE_MT_UNCACHED)
106 #define pgprot_writecombine(prot) \
107 __pgprot_modify(prot, L_PTE_MT_MASK, L_PTE_MT_BUFFERABLE)
109 #define pgprot_stronglyordered(prot) \
110 __pgprot_modify(prot, L_PTE_MT_MASK, L_PTE_MT_UNCACHED)
112 #define pgprot_writethrough(prot) \
113 __pgprot_modify(prot, L_PTE_MT_MASK, L_PTE_MT_WRITETHROUGH)
115 #ifdef CONFIG_ARM_DMA_MEM_BUFFERABLE
116 #define pgprot_dmacoherent(prot) \
117 __pgprot_modify(prot, L_PTE_MT_MASK, L_PTE_MT_BUFFERABLE | L_PTE_XN)
118 #define __HAVE_PHYS_MEM_ACCESS_PROT
120 extern pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,
121 unsigned long size, pgprot_t vma_prot);
123 #define pgprot_dmacoherent(prot) \
124 __pgprot_modify(prot, L_PTE_MT_MASK, L_PTE_MT_UNCACHED | L_PTE_XN)
127 #endif /* __ASSEMBLY__ */
130 * The table below defines the page protection levels that we insert into our
131 * Linux page table version. These get translated into the best that the
132 * architecture can perform. Note that on most ARM hardware:
133 * 1) We cannot do execute protection
134 * 2) If we could do execute protection, then read is implied
135 * 3) write implies read permissions
137 #define __P000 __PAGE_NONE
138 #define __P001 __PAGE_READONLY
139 #define __P010 __PAGE_COPY
140 #define __P011 __PAGE_COPY
141 #define __P100 __PAGE_READONLY_EXEC
142 #define __P101 __PAGE_READONLY_EXEC
143 #define __P110 __PAGE_COPY_EXEC
144 #define __P111 __PAGE_COPY_EXEC
146 #define __S000 __PAGE_NONE
147 #define __S001 __PAGE_READONLY
148 #define __S010 __PAGE_SHARED
149 #define __S011 __PAGE_SHARED
150 #define __S100 __PAGE_READONLY_EXEC
151 #define __S101 __PAGE_READONLY_EXEC
152 #define __S110 __PAGE_SHARED_EXEC
153 #define __S111 __PAGE_SHARED_EXEC
157 * ZERO_PAGE is a global shared page that is always zero: used
158 * for zero-mapped memory areas etc..
160 extern struct page *empty_zero_page;
161 #define ZERO_PAGE(vaddr) (empty_zero_page)
164 extern pgd_t swapper_pg_dir[PTRS_PER_PGD];
166 /* to find an entry in a page-table-directory */
167 #define pgd_index(addr) ((addr) >> PGDIR_SHIFT)
169 #define pgd_offset(mm, addr) ((mm)->pgd + pgd_index(addr))
171 /* to find an entry in a kernel page-table-directory */
172 #define pgd_offset_k(addr) pgd_offset(&init_mm, addr)
174 #define pmd_none(pmd) (!pmd_val(pmd))
175 #define pmd_present(pmd) (pmd_val(pmd))
177 static inline pte_t *pmd_page_vaddr(pmd_t pmd)
179 return __va(pmd_val(pmd) & PHYS_MASK & (s32)PAGE_MASK);
182 #define pmd_page(pmd) pfn_to_page(__phys_to_pfn(pmd_val(pmd) & PHYS_MASK))
184 #ifndef CONFIG_HIGHPTE
185 #define __pte_map(pmd) pmd_page_vaddr(*(pmd))
186 #define __pte_unmap(pte) do { } while (0)
188 #define __pte_map(pmd) (pte_t *)kmap_atomic(pmd_page(*(pmd)))
189 #define __pte_unmap(pte) kunmap_atomic(pte)
192 #define pte_index(addr) (((addr) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1))
194 #define pte_offset_kernel(pmd,addr) (pmd_page_vaddr(*(pmd)) + pte_index(addr))
196 #define pte_offset_map(pmd,addr) (__pte_map(pmd) + pte_index(addr))
197 #define pte_unmap(pte) __pte_unmap(pte)
199 #define pte_pfn(pte) ((pte_val(pte) & PHYS_MASK) >> PAGE_SHIFT)
200 #define pfn_pte(pfn,prot) __pte(__pfn_to_phys(pfn) | pgprot_val(prot))
202 #define pte_page(pte) pfn_to_page(pte_pfn(pte))
203 #define mk_pte(page,prot) pfn_pte(page_to_pfn(page), prot)
205 #define pte_clear(mm,addr,ptep) set_pte_ext(ptep, __pte(0), 0)
207 #define pte_none(pte) (!pte_val(pte))
208 #define pte_present(pte) (pte_val(pte) & L_PTE_PRESENT)
209 #define pte_write(pte) (!(pte_val(pte) & L_PTE_RDONLY))
210 #define pte_dirty(pte) (pte_val(pte) & L_PTE_DIRTY)
211 #define pte_young(pte) (pte_val(pte) & L_PTE_YOUNG)
212 #define pte_exec(pte) (!(pte_val(pte) & L_PTE_XN))
213 #define pte_special(pte) (0)
215 #define pte_present_user(pte) (pte_present(pte) && (pte_val(pte) & L_PTE_USER))
217 #if __LINUX_ARM_ARCH__ < 6
218 static inline void __sync_icache_dcache(pte_t pteval)
222 extern void __sync_icache_dcache(pte_t pteval);
225 static inline void set_pte_at(struct mm_struct *mm, unsigned long addr,
226 pte_t *ptep, pte_t pteval)
228 unsigned long ext = 0;
230 if (addr < TASK_SIZE && pte_present_user(pteval)) {
231 __sync_icache_dcache(pteval);
235 set_pte_ext(ptep, pteval, ext);
238 #define PTE_BIT_FUNC(fn,op) \
239 static inline pte_t pte_##fn(pte_t pte) { pte_val(pte) op; return pte; }
241 PTE_BIT_FUNC(wrprotect, |= L_PTE_RDONLY);
242 PTE_BIT_FUNC(mkwrite, &= ~L_PTE_RDONLY);
243 PTE_BIT_FUNC(mkclean, &= ~L_PTE_DIRTY);
244 PTE_BIT_FUNC(mkdirty, |= L_PTE_DIRTY);
245 PTE_BIT_FUNC(mkold, &= ~L_PTE_YOUNG);
246 PTE_BIT_FUNC(mkyoung, |= L_PTE_YOUNG);
248 static inline pte_t pte_mkspecial(pte_t pte) { return pte; }
250 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
252 const pteval_t mask = L_PTE_XN | L_PTE_RDONLY | L_PTE_USER;
253 pte_val(pte) = (pte_val(pte) & ~mask) | (pgprot_val(newprot) & mask);
258 * Encode and decode a swap entry. Swap entries are stored in the Linux
259 * page tables as follows:
261 * 3 3 2 2 2 2 2 2 2 2 2 2 1 1 1 1 1 1 1 1 1 1
262 * 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0
263 * <--------------- offset ----------------------> < type -> 0 0 0
265 * This gives us up to 31 swap files and 64GB per swap file. Note that
266 * the offset field is always non-zero.
268 #define __SWP_TYPE_SHIFT 3
269 #define __SWP_TYPE_BITS 5
270 #define __SWP_TYPE_MASK ((1 << __SWP_TYPE_BITS) - 1)
271 #define __SWP_OFFSET_SHIFT (__SWP_TYPE_BITS + __SWP_TYPE_SHIFT)
273 #define __swp_type(x) (((x).val >> __SWP_TYPE_SHIFT) & __SWP_TYPE_MASK)
274 #define __swp_offset(x) ((x).val >> __SWP_OFFSET_SHIFT)
275 #define __swp_entry(type,offset) ((swp_entry_t) { ((type) << __SWP_TYPE_SHIFT) | ((offset) << __SWP_OFFSET_SHIFT) })
277 #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) })
278 #define __swp_entry_to_pte(swp) ((pte_t) { (swp).val })
281 * It is an error for the kernel to have more swap files than we can
282 * encode in the PTEs. This ensures that we know when MAX_SWAPFILES
283 * is increased beyond what we presently support.
285 #define MAX_SWAPFILES_CHECK() BUILD_BUG_ON(MAX_SWAPFILES_SHIFT > __SWP_TYPE_BITS)
288 * Encode and decode a file entry. File entries are stored in the Linux
289 * page tables as follows:
291 * 3 3 2 2 2 2 2 2 2 2 2 2 1 1 1 1 1 1 1 1 1 1
292 * 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0
293 * <----------------------- offset ------------------------> 1 0 0
295 #define pte_file(pte) (pte_val(pte) & L_PTE_FILE)
296 #define pte_to_pgoff(x) (pte_val(x) >> 3)
297 #define pgoff_to_pte(x) __pte(((x) << 3) | L_PTE_FILE)
299 #define PTE_FILE_MAX_BITS 29
301 /* Needs to be defined here and not in linux/mm.h, as it is arch dependent */
302 /* FIXME: this is not correct */
303 #define kern_addr_valid(addr) (1)
305 #include <asm-generic/pgtable.h>
308 * We provide our own arch_get_unmapped_area to cope with VIPT caches.
310 #define HAVE_ARCH_UNMAPPED_AREA
313 * remap a physical page `pfn' of size `size' with page protection `prot'
314 * into virtual address `from'
316 #define io_remap_pfn_range(vma,from,pfn,size,prot) \
317 remap_pfn_range(vma, from, pfn, size, prot)
319 #define pgtable_cache_init() do { } while (0)
321 #endif /* !__ASSEMBLY__ */
323 #endif /* CONFIG_MMU */
325 #endif /* _ASMARM_PGTABLE_H */