~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

TOMOYO Linux Cross Reference
Linux/arch/unicore32/include/asm/pgtable.h

Version: ~ [ linux-5.5-rc1 ] ~ [ linux-5.4.2 ] ~ [ linux-5.3.15 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.88 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.158 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.206 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.206 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.140 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.78 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-3.9.11 ] ~ [ linux-3.8.13 ] ~ [ linux-3.7.10 ] ~ [ linux-3.6.11 ] ~ [ linux-3.5.7 ] ~ [ linux-3.4.113 ] ~ [ linux-3.3.8 ] ~ [ linux-3.2.102 ] ~ [ linux-3.1.10 ] ~ [ linux-3.0.101 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  1 /*
  2  * linux/arch/unicore32/include/asm/pgtable.h
  3  *
  4  * Code specific to PKUnity SoC and UniCore ISA
  5  *
  6  * Copyright (C) 2001-2010 GUAN Xue-tao
  7  *
  8  * This program is free software; you can redistribute it and/or modify
  9  * it under the terms of the GNU General Public License version 2 as
 10  * published by the Free Software Foundation.
 11  */
 12 #ifndef __UNICORE_PGTABLE_H__
 13 #define __UNICORE_PGTABLE_H__
 14 
 15 #include <asm-generic/pgtable-nopmd.h>
 16 #include <asm/cpu-single.h>
 17 
 18 #include <asm/memory.h>
 19 #include <asm/pgtable-hwdef.h>
 20 
 21 /*
 22  * Just any arbitrary offset to the start of the vmalloc VM area: the
 23  * current 8MB value just means that there will be a 8MB "hole" after the
 24  * physical memory until the kernel virtual memory starts.  That means that
 25  * any out-of-bounds memory accesses will hopefully be caught.
 26  * The vmalloc() routines leaves a hole of 4kB between each vmalloced
 27  * area for the same reason. ;)
 28  *
 29  * Note that platforms may override VMALLOC_START, but they must provide
 30  * VMALLOC_END.  VMALLOC_END defines the (exclusive) limit of this space,
 31  * which may not overlap IO space.
 32  */
 33 #ifndef VMALLOC_START
 34 #define VMALLOC_OFFSET          SZ_8M
 35 #define VMALLOC_START           (((unsigned long)high_memory + VMALLOC_OFFSET) \
 36                                         & ~(VMALLOC_OFFSET-1))
 37 #define VMALLOC_END             (0xff000000UL)
 38 #endif
 39 
 40 #define PTRS_PER_PTE            1024
 41 #define PTRS_PER_PGD            1024
 42 
 43 /*
 44  * PGDIR_SHIFT determines what a third-level page table entry can map
 45  */
 46 #define PGDIR_SHIFT             22
 47 
 48 #ifndef __ASSEMBLY__
 49 extern void __pte_error(const char *file, int line, unsigned long val);
 50 extern void __pgd_error(const char *file, int line, unsigned long val);
 51 
 52 #define pte_ERROR(pte)          __pte_error(__FILE__, __LINE__, pte_val(pte))
 53 #define pgd_ERROR(pgd)          __pgd_error(__FILE__, __LINE__, pgd_val(pgd))
 54 #endif /* !__ASSEMBLY__ */
 55 
 56 #define PGDIR_SIZE              (1UL << PGDIR_SHIFT)
 57 #define PGDIR_MASK              (~(PGDIR_SIZE-1))
 58 
 59 /*
 60  * This is the lowest virtual address we can permit any user space
 61  * mapping to be mapped at.  This is particularly important for
 62  * non-high vector CPUs.
 63  */
 64 #define FIRST_USER_ADDRESS      PAGE_SIZE
 65 
 66 #define FIRST_USER_PGD_NR       1
 67 #define USER_PTRS_PER_PGD       ((TASK_SIZE/PGDIR_SIZE) - FIRST_USER_PGD_NR)
 68 
 69 /*
 70  * section address mask and size definitions.
 71  */
 72 #define SECTION_SHIFT           22
 73 #define SECTION_SIZE            (1UL << SECTION_SHIFT)
 74 #define SECTION_MASK            (~(SECTION_SIZE-1))
 75 
 76 #ifndef __ASSEMBLY__
 77 
 78 /*
 79  * The pgprot_* and protection_map entries will be fixed up in runtime
 80  * to include the cachable bits based on memory policy, as well as any
 81  * architecture dependent bits.
 82  */
 83 #define _PTE_DEFAULT            (PTE_PRESENT | PTE_YOUNG | PTE_CACHEABLE)
 84 
 85 extern pgprot_t pgprot_user;
 86 extern pgprot_t pgprot_kernel;
 87 
 88 #define PAGE_NONE               pgprot_user
 89 #define PAGE_SHARED             __pgprot(pgprot_val(pgprot_user | PTE_READ \
 90                                                                 | PTE_WRITE))
 91 #define PAGE_SHARED_EXEC        __pgprot(pgprot_val(pgprot_user | PTE_READ \
 92                                                                 | PTE_WRITE \
 93                                                                 | PTE_EXEC))
 94 #define PAGE_COPY               __pgprot(pgprot_val(pgprot_user | PTE_READ)
 95 #define PAGE_COPY_EXEC          __pgprot(pgprot_val(pgprot_user | PTE_READ \
 96                                                                 | PTE_EXEC))
 97 #define PAGE_READONLY           __pgprot(pgprot_val(pgprot_user | PTE_READ))
 98 #define PAGE_READONLY_EXEC      __pgprot(pgprot_val(pgprot_user | PTE_READ \
 99                                                                 | PTE_EXEC))
100 #define PAGE_KERNEL             pgprot_kernel
101 #define PAGE_KERNEL_EXEC        __pgprot(pgprot_val(pgprot_kernel | PTE_EXEC))
102 
103 #define __PAGE_NONE             __pgprot(_PTE_DEFAULT)
104 #define __PAGE_SHARED           __pgprot(_PTE_DEFAULT | PTE_READ \
105                                                         | PTE_WRITE)
106 #define __PAGE_SHARED_EXEC      __pgprot(_PTE_DEFAULT | PTE_READ \
107                                                         | PTE_WRITE \
108                                                         | PTE_EXEC)
109 #define __PAGE_COPY             __pgprot(_PTE_DEFAULT | PTE_READ)
110 #define __PAGE_COPY_EXEC        __pgprot(_PTE_DEFAULT | PTE_READ \
111                                                         | PTE_EXEC)
112 #define __PAGE_READONLY         __pgprot(_PTE_DEFAULT | PTE_READ)
113 #define __PAGE_READONLY_EXEC    __pgprot(_PTE_DEFAULT | PTE_READ \
114                                                         | PTE_EXEC)
115 
116 #endif /* __ASSEMBLY__ */
117 
118 /*
119  * The table below defines the page protection levels that we insert into our
120  * Linux page table version.  These get translated into the best that the
121  * architecture can perform.  Note that on UniCore hardware:
122  *  1) We cannot do execute protection
123  *  2) If we could do execute protection, then read is implied
124  *  3) write implies read permissions
125  */
126 #define __P000  __PAGE_NONE
127 #define __P001  __PAGE_READONLY
128 #define __P010  __PAGE_COPY
129 #define __P011  __PAGE_COPY
130 #define __P100  __PAGE_READONLY_EXEC
131 #define __P101  __PAGE_READONLY_EXEC
132 #define __P110  __PAGE_COPY_EXEC
133 #define __P111  __PAGE_COPY_EXEC
134 
135 #define __S000  __PAGE_NONE
136 #define __S001  __PAGE_READONLY
137 #define __S010  __PAGE_SHARED
138 #define __S011  __PAGE_SHARED
139 #define __S100  __PAGE_READONLY_EXEC
140 #define __S101  __PAGE_READONLY_EXEC
141 #define __S110  __PAGE_SHARED_EXEC
142 #define __S111  __PAGE_SHARED_EXEC
143 
144 #ifndef __ASSEMBLY__
145 /*
146  * ZERO_PAGE is a global shared page that is always zero: used
147  * for zero-mapped memory areas etc..
148  */
149 extern struct page *empty_zero_page;
150 #define ZERO_PAGE(vaddr)                (empty_zero_page)
151 
152 #define pte_pfn(pte)                    (pte_val(pte) >> PAGE_SHIFT)
153 #define pfn_pte(pfn, prot)              (__pte(((pfn) << PAGE_SHIFT) \
154                                                 | pgprot_val(prot)))
155 
156 #define pte_none(pte)                   (!pte_val(pte))
157 #define pte_clear(mm, addr, ptep)       set_pte(ptep, __pte(0))
158 #define pte_page(pte)                   (pfn_to_page(pte_pfn(pte)))
159 #define pte_offset_kernel(dir, addr)    (pmd_page_vaddr(*(dir)) \
160                                                 + __pte_index(addr))
161 
162 #define pte_offset_map(dir, addr)       (pmd_page_vaddr(*(dir)) \
163                                                 + __pte_index(addr))
164 #define pte_unmap(pte)                  do { } while (0)
165 
166 #define set_pte(ptep, pte)      cpu_set_pte(ptep, pte)
167 
168 #define set_pte_at(mm, addr, ptep, pteval)      \
169         do {                                    \
170                 set_pte(ptep, pteval);          \
171         } while (0)
172 
173 /*
174  * The following only work if pte_present() is true.
175  * Undefined behaviour if not..
176  */
177 #define pte_present(pte)        (pte_val(pte) & PTE_PRESENT)
178 #define pte_write(pte)          (pte_val(pte) & PTE_WRITE)
179 #define pte_dirty(pte)          (pte_val(pte) & PTE_DIRTY)
180 #define pte_young(pte)          (pte_val(pte) & PTE_YOUNG)
181 #define pte_exec(pte)           (pte_val(pte) & PTE_EXEC)
182 #define pte_special(pte)        (0)
183 
184 #define PTE_BIT_FUNC(fn, op) \
185 static inline pte_t pte_##fn(pte_t pte) { pte_val(pte) op; return pte; }
186 
187 PTE_BIT_FUNC(wrprotect, &= ~PTE_WRITE);
188 PTE_BIT_FUNC(mkwrite,   |= PTE_WRITE);
189 PTE_BIT_FUNC(mkclean,   &= ~PTE_DIRTY);
190 PTE_BIT_FUNC(mkdirty,   |= PTE_DIRTY);
191 PTE_BIT_FUNC(mkold,     &= ~PTE_YOUNG);
192 PTE_BIT_FUNC(mkyoung,   |= PTE_YOUNG);
193 
194 static inline pte_t pte_mkspecial(pte_t pte) { return pte; }
195 
196 /*
197  * Mark the prot value as uncacheable.
198  */
199 #define pgprot_noncached(prot)          \
200         __pgprot(pgprot_val(prot) & ~PTE_CACHEABLE)
201 #define pgprot_writecombine(prot)       \
202         __pgprot(pgprot_val(prot) & ~PTE_CACHEABLE)
203 #define pgprot_dmacoherent(prot)        \
204         __pgprot(pgprot_val(prot) & ~PTE_CACHEABLE)
205 
206 #define pmd_none(pmd)           (!pmd_val(pmd))
207 #define pmd_present(pmd)        (pmd_val(pmd) & PMD_PRESENT)
208 #define pmd_bad(pmd)            (((pmd_val(pmd) &               \
209                                 (PMD_PRESENT | PMD_TYPE_MASK))  \
210                                 != (PMD_PRESENT | PMD_TYPE_TABLE)))
211 
212 #define set_pmd(pmdpd, pmdval)          \
213         do {                            \
214                 *(pmdpd) = pmdval;      \
215         } while (0)
216 
217 #define pmd_clear(pmdp)                 \
218         do {                            \
219                 set_pmd(pmdp, __pmd(0));\
220                 clean_pmd_entry(pmdp);  \
221         } while (0)
222 
223 #define pmd_page_vaddr(pmd) ((pte_t *)__va(pmd_val(pmd) & PAGE_MASK))
224 #define pmd_page(pmd)           pfn_to_page(__phys_to_pfn(pmd_val(pmd)))
225 
226 /*
227  * Conversion functions: convert a page and protection to a page entry,
228  * and a page entry and page directory to the page they refer to.
229  */
230 #define mk_pte(page, prot)      pfn_pte(page_to_pfn(page), prot)
231 
232 /* to find an entry in a page-table-directory */
233 #define pgd_index(addr)         ((addr) >> PGDIR_SHIFT)
234 
235 #define pgd_offset(mm, addr)    ((mm)->pgd+pgd_index(addr))
236 
237 /* to find an entry in a kernel page-table-directory */
238 #define pgd_offset_k(addr)      pgd_offset(&init_mm, addr)
239 
240 /* Find an entry in the third-level page table.. */
241 #define __pte_index(addr)       (((addr) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1))
242 
243 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
244 {
245         const unsigned long mask = PTE_EXEC | PTE_WRITE | PTE_READ;
246         pte_val(pte) = (pte_val(pte) & ~mask) | (pgprot_val(newprot) & mask);
247         return pte;
248 }
249 
250 extern pgd_t swapper_pg_dir[PTRS_PER_PGD];
251 
252 /*
253  * Encode and decode a swap entry.  Swap entries are stored in the Linux
254  * page tables as follows:
255  *
256  *   3 3 2 2 2 2 2 2 2 2 2 2 1 1 1 1 1 1 1 1 1 1
257  *   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
258  *   <--------------- offset --------------> <--- type --> 0 0 0 0 0
259  *
260  * This gives us up to 127 swap files and 32GB per swap file.  Note that
261  * the offset field is always non-zero.
262  */
263 #define __SWP_TYPE_SHIFT        5
264 #define __SWP_TYPE_BITS         7
265 #define __SWP_TYPE_MASK         ((1 << __SWP_TYPE_BITS) - 1)
266 #define __SWP_OFFSET_SHIFT      (__SWP_TYPE_BITS + __SWP_TYPE_SHIFT)
267 
268 #define __swp_type(x)           (((x).val >> __SWP_TYPE_SHIFT)          \
269                                 & __SWP_TYPE_MASK)
270 #define __swp_offset(x)         ((x).val >> __SWP_OFFSET_SHIFT)
271 #define __swp_entry(type, offset) ((swp_entry_t) {                      \
272                                 ((type) << __SWP_TYPE_SHIFT) |          \
273                                 ((offset) << __SWP_OFFSET_SHIFT) })
274 
275 #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) })
276 #define __swp_entry_to_pte(swp) ((pte_t) { (swp).val })
277 
278 /*
279  * It is an error for the kernel to have more swap files than we can
280  * encode in the PTEs.  This ensures that we know when MAX_SWAPFILES
281  * is increased beyond what we presently support.
282  */
283 #define MAX_SWAPFILES_CHECK()   \
284         BUILD_BUG_ON(MAX_SWAPFILES_SHIFT > __SWP_TYPE_BITS)
285 
286 /* Needs to be defined here and not in linux/mm.h, as it is arch dependent */
287 /* FIXME: this is not correct */
288 #define kern_addr_valid(addr)   (1)
289 
290 #include <asm-generic/pgtable.h>
291 
292 #define pgtable_cache_init() do { } while (0)
293 
294 #endif /* !__ASSEMBLY__ */
295 
296 #endif /* __UNICORE_PGTABLE_H__ */
297 

~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

kernel.org | git.kernel.org | LWN.net | Project Home | Wiki (Japanese) | Wiki (English) | SVN repository | Mail admin

Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.

osdn.jp