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Linux/arch/m32r/include/asm/pgtable.h

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  1 #ifndef _ASM_M32R_PGTABLE_H
  2 #define _ASM_M32R_PGTABLE_H
  3 
  4 #include <asm-generic/4level-fixup.h>
  5 
  6 #ifdef __KERNEL__
  7 /*
  8  * The Linux memory management assumes a three-level page table setup. On
  9  * the M32R, we use that, but "fold" the mid level into the top-level page
 10  * table, so that we physically have the same two-level page table as the
 11  * M32R mmu expects.
 12  *
 13  * This file contains the functions and defines necessary to modify and use
 14  * the M32R page table tree.
 15  */
 16 
 17 /* CAUTION!: If you change macro definitions in this file, you might have to
 18  * change arch/m32r/mmu.S manually.
 19  */
 20 
 21 #ifndef __ASSEMBLY__
 22 
 23 #include <linux/threads.h>
 24 #include <linux/bitops.h>
 25 #include <asm/processor.h>
 26 #include <asm/addrspace.h>
 27 #include <asm/page.h>
 28 
 29 struct mm_struct;
 30 struct vm_area_struct;
 31 
 32 extern pgd_t swapper_pg_dir[1024];
 33 extern void paging_init(void);
 34 
 35 /*
 36  * ZERO_PAGE is a global shared page that is always zero: used
 37  * for zero-mapped memory areas etc..
 38  */
 39 extern unsigned long empty_zero_page[1024];
 40 #define ZERO_PAGE(vaddr)        (virt_to_page(empty_zero_page))
 41 
 42 #endif /* !__ASSEMBLY__ */
 43 
 44 #ifndef __ASSEMBLY__
 45 #include <asm/pgtable-2level.h>
 46 #endif
 47 
 48 #define pgtable_cache_init()    do { } while (0)
 49 
 50 #define PMD_SIZE        (1UL << PMD_SHIFT)
 51 #define PMD_MASK        (~(PMD_SIZE - 1))
 52 #define PGDIR_SIZE      (1UL << PGDIR_SHIFT)
 53 #define PGDIR_MASK      (~(PGDIR_SIZE - 1))
 54 
 55 #define USER_PTRS_PER_PGD       (TASK_SIZE / PGDIR_SIZE)
 56 #define FIRST_USER_ADDRESS      0UL
 57 
 58 #ifndef __ASSEMBLY__
 59 /* Just any arbitrary offset to the start of the vmalloc VM area: the
 60  * current 8MB value just means that there will be a 8MB "hole" after the
 61  * physical memory until the kernel virtual memory starts.  That means that
 62  * any out-of-bounds memory accesses will hopefully be caught.
 63  * The vmalloc() routines leaves a hole of 4kB between each vmalloced
 64  * area for the same reason. ;)
 65  */
 66 #define VMALLOC_START           KSEG2
 67 #define VMALLOC_END             KSEG3
 68 
 69 /*
 70  *     M32R TLB format
 71  *
 72  *     [0]    [1:19]           [20:23]       [24:31]
 73  *     +-----------------------+----+-------------+
 74  *     |          VPN          |0000|    ASID     |
 75  *     +-----------------------+----+-------------+
 76  *     +-+---------------------+----+-+---+-+-+-+-+
 77  *     |0         PPN          |0000|N|AC |L|G|V| |
 78  *     +-+---------------------+----+-+---+-+-+-+-+
 79  *                                     RWX
 80  */
 81 
 82 #define _PAGE_BIT_DIRTY         0       /* software: page changed */
 83 #define _PAGE_BIT_PRESENT       1       /* Valid: page is valid */
 84 #define _PAGE_BIT_GLOBAL        2       /* Global */
 85 #define _PAGE_BIT_LARGE         3       /* Large */
 86 #define _PAGE_BIT_EXEC          4       /* Execute */
 87 #define _PAGE_BIT_WRITE         5       /* Write */
 88 #define _PAGE_BIT_READ          6       /* Read */
 89 #define _PAGE_BIT_NONCACHABLE   7       /* Non cachable */
 90 #define _PAGE_BIT_ACCESSED      8       /* software: page referenced */
 91 #define _PAGE_BIT_PROTNONE      9       /* software: if not present */
 92 
 93 #define _PAGE_DIRTY             (1UL << _PAGE_BIT_DIRTY)
 94 #define _PAGE_PRESENT           (1UL << _PAGE_BIT_PRESENT)
 95 #define _PAGE_GLOBAL            (1UL << _PAGE_BIT_GLOBAL)
 96 #define _PAGE_LARGE             (1UL << _PAGE_BIT_LARGE)
 97 #define _PAGE_EXEC              (1UL << _PAGE_BIT_EXEC)
 98 #define _PAGE_WRITE             (1UL << _PAGE_BIT_WRITE)
 99 #define _PAGE_READ              (1UL << _PAGE_BIT_READ)
100 #define _PAGE_NONCACHABLE       (1UL << _PAGE_BIT_NONCACHABLE)
101 #define _PAGE_ACCESSED          (1UL << _PAGE_BIT_ACCESSED)
102 #define _PAGE_PROTNONE          (1UL << _PAGE_BIT_PROTNONE)
103 
104 #define _PAGE_TABLE     \
105         ( _PAGE_PRESENT | _PAGE_WRITE | _PAGE_READ | _PAGE_ACCESSED \
106         | _PAGE_DIRTY )
107 #define _KERNPG_TABLE   \
108         ( _PAGE_PRESENT | _PAGE_WRITE | _PAGE_READ | _PAGE_ACCESSED \
109         | _PAGE_DIRTY )
110 #define _PAGE_CHG_MASK  \
111         ( PTE_MASK | _PAGE_ACCESSED | _PAGE_DIRTY )
112 
113 #ifdef CONFIG_MMU
114 #define PAGE_NONE       \
115         __pgprot(_PAGE_PROTNONE | _PAGE_ACCESSED)
116 #define PAGE_SHARED     \
117         __pgprot(_PAGE_PRESENT | _PAGE_WRITE | _PAGE_READ | _PAGE_ACCESSED)
118 #define PAGE_SHARED_EXEC \
119         __pgprot(_PAGE_PRESENT | _PAGE_EXEC | _PAGE_WRITE | _PAGE_READ \
120                 | _PAGE_ACCESSED)
121 #define PAGE_COPY       \
122         __pgprot(_PAGE_PRESENT | _PAGE_READ | _PAGE_ACCESSED)
123 #define PAGE_COPY_EXEC  \
124         __pgprot(_PAGE_PRESENT | _PAGE_EXEC | _PAGE_READ | _PAGE_ACCESSED)
125 #define PAGE_READONLY   \
126         __pgprot(_PAGE_PRESENT | _PAGE_READ | _PAGE_ACCESSED)
127 #define PAGE_READONLY_EXEC \
128         __pgprot(_PAGE_PRESENT | _PAGE_EXEC | _PAGE_READ | _PAGE_ACCESSED)
129 
130 #define __PAGE_KERNEL   \
131         ( _PAGE_PRESENT | _PAGE_EXEC | _PAGE_WRITE | _PAGE_READ | _PAGE_DIRTY \
132         | _PAGE_ACCESSED )
133 #define __PAGE_KERNEL_RO        ( __PAGE_KERNEL & ~_PAGE_WRITE )
134 #define __PAGE_KERNEL_NOCACHE   ( __PAGE_KERNEL | _PAGE_NONCACHABLE)
135 
136 #define MAKE_GLOBAL(x)  __pgprot((x) | _PAGE_GLOBAL)
137 
138 #define PAGE_KERNEL             MAKE_GLOBAL(__PAGE_KERNEL)
139 #define PAGE_KERNEL_RO          MAKE_GLOBAL(__PAGE_KERNEL_RO)
140 #define PAGE_KERNEL_NOCACHE     MAKE_GLOBAL(__PAGE_KERNEL_NOCACHE)
141 
142 #else
143 #define PAGE_NONE               __pgprot(0)
144 #define PAGE_SHARED             __pgprot(0)
145 #define PAGE_SHARED_EXEC        __pgprot(0)
146 #define PAGE_COPY               __pgprot(0)
147 #define PAGE_COPY_EXEC          __pgprot(0)
148 #define PAGE_READONLY           __pgprot(0)
149 #define PAGE_READONLY_EXEC      __pgprot(0)
150 
151 #define PAGE_KERNEL             __pgprot(0)
152 #define PAGE_KERNEL_RO          __pgprot(0)
153 #define PAGE_KERNEL_NOCACHE     __pgprot(0)
154 #endif /* CONFIG_MMU */
155 
156         /* xwr */
157 #define __P000  PAGE_NONE
158 #define __P001  PAGE_READONLY
159 #define __P010  PAGE_COPY
160 #define __P011  PAGE_COPY
161 #define __P100  PAGE_READONLY_EXEC
162 #define __P101  PAGE_READONLY_EXEC
163 #define __P110  PAGE_COPY_EXEC
164 #define __P111  PAGE_COPY_EXEC
165 
166 #define __S000  PAGE_NONE
167 #define __S001  PAGE_READONLY
168 #define __S010  PAGE_SHARED
169 #define __S011  PAGE_SHARED
170 #define __S100  PAGE_READONLY_EXEC
171 #define __S101  PAGE_READONLY_EXEC
172 #define __S110  PAGE_SHARED_EXEC
173 #define __S111  PAGE_SHARED_EXEC
174 
175 /* page table for 0-4MB for everybody */
176 
177 #define pte_present(x)  (pte_val(x) & (_PAGE_PRESENT | _PAGE_PROTNONE))
178 #define pte_clear(mm,addr,xp)   do { set_pte_at(mm, addr, xp, __pte(0)); } while (0)
179 
180 #define pmd_none(x)     (!pmd_val(x))
181 #define pmd_present(x)  (pmd_val(x) & _PAGE_PRESENT)
182 #define pmd_clear(xp)   do { set_pmd(xp, __pmd(0)); } while (0)
183 #define pmd_bad(x)      ((pmd_val(x) & ~PAGE_MASK) != _KERNPG_TABLE)
184 
185 #define pages_to_mb(x)  ((x) >> (20 - PAGE_SHIFT))
186 
187 /*
188  * The following only work if pte_present() is true.
189  * Undefined behaviour if not..
190  */
191 static inline int pte_dirty(pte_t pte)
192 {
193         return pte_val(pte) & _PAGE_DIRTY;
194 }
195 
196 static inline int pte_young(pte_t pte)
197 {
198         return pte_val(pte) & _PAGE_ACCESSED;
199 }
200 
201 static inline int pte_write(pte_t pte)
202 {
203         return pte_val(pte) & _PAGE_WRITE;
204 }
205 
206 static inline int pte_special(pte_t pte)
207 {
208         return 0;
209 }
210 
211 static inline pte_t pte_mkclean(pte_t pte)
212 {
213         pte_val(pte) &= ~_PAGE_DIRTY;
214         return pte;
215 }
216 
217 static inline pte_t pte_mkold(pte_t pte)
218 {
219         pte_val(pte) &= ~_PAGE_ACCESSED;
220         return pte;
221 }
222 
223 static inline pte_t pte_wrprotect(pte_t pte)
224 {
225         pte_val(pte) &= ~_PAGE_WRITE;
226         return pte;
227 }
228 
229 static inline pte_t pte_mkdirty(pte_t pte)
230 {
231         pte_val(pte) |= _PAGE_DIRTY;
232         return pte;
233 }
234 
235 static inline pte_t pte_mkyoung(pte_t pte)
236 {
237         pte_val(pte) |= _PAGE_ACCESSED;
238         return pte;
239 }
240 
241 static inline pte_t pte_mkwrite(pte_t pte)
242 {
243         pte_val(pte) |= _PAGE_WRITE;
244         return pte;
245 }
246 
247 static inline pte_t pte_mkspecial(pte_t pte)
248 {
249         return pte;
250 }
251 
252 static inline  int ptep_test_and_clear_young(struct vm_area_struct *vma, unsigned long addr, pte_t *ptep)
253 {
254         return test_and_clear_bit(_PAGE_BIT_ACCESSED, ptep);
255 }
256 
257 static inline void ptep_set_wrprotect(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
258 {
259         clear_bit(_PAGE_BIT_WRITE, ptep);
260 }
261 
262 /*
263  * Macro and implementation to make a page protection as uncachable.
264  */
265 static inline pgprot_t pgprot_noncached(pgprot_t _prot)
266 {
267         unsigned long prot = pgprot_val(_prot);
268 
269         prot |= _PAGE_NONCACHABLE;
270         return __pgprot(prot);
271 }
272 
273 #define pgprot_writecombine(prot) pgprot_noncached(prot)
274 
275 /*
276  * Conversion functions: convert a page and protection to a page entry,
277  * and a page entry and page directory to the page they refer to.
278  */
279 #define mk_pte(page, pgprot)    pfn_pte(page_to_pfn(page), pgprot)
280 
281 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
282 {
283         set_pte(&pte, __pte((pte_val(pte) & _PAGE_CHG_MASK) \
284                 | pgprot_val(newprot)));
285 
286         return pte;
287 }
288 
289 /*
290  * Conversion functions: convert a page and protection to a page entry,
291  * and a page entry and page directory to the page they refer to.
292  */
293 
294 static inline void pmd_set(pmd_t * pmdp, pte_t * ptep)
295 {
296         pmd_val(*pmdp) = (((unsigned long) ptep) & PAGE_MASK);
297 }
298 
299 #define pmd_page_vaddr(pmd)     \
300         ((unsigned long) __va(pmd_val(pmd) & PAGE_MASK))
301 
302 #ifndef CONFIG_DISCONTIGMEM
303 #define pmd_page(pmd)   (mem_map + ((pmd_val(pmd) >> PAGE_SHIFT) - PFN_BASE))
304 #endif /* !CONFIG_DISCONTIGMEM */
305 
306 /* to find an entry in a page-table-directory. */
307 #define pgd_index(address)      \
308         (((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD - 1))
309 
310 #define pgd_offset(mm, address) ((mm)->pgd + pgd_index(address))
311 
312 /* to find an entry in a kernel page-table-directory */
313 #define pgd_offset_k(address)   pgd_offset(&init_mm, address)
314 
315 #define pmd_index(address)      \
316         (((address) >> PMD_SHIFT) & (PTRS_PER_PMD - 1))
317 
318 #define pte_index(address)      \
319         (((address) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1))
320 #define pte_offset_kernel(dir, address) \
321         ((pte_t *)pmd_page_vaddr(*(dir)) + pte_index(address))
322 #define pte_offset_map(dir, address)    \
323         ((pte_t *)page_address(pmd_page(*(dir))) + pte_index(address))
324 #define pte_unmap(pte)          do { } while (0)
325 
326 /* Encode and de-code a swap entry */
327 #define __swp_type(x)                   (((x).val >> 2) & 0x1f)
328 #define __swp_offset(x)                 ((x).val >> 10)
329 #define __swp_entry(type, offset)       \
330         ((swp_entry_t) { ((type) << 2) | ((offset) << 10) })
331 #define __pte_to_swp_entry(pte)         ((swp_entry_t) { pte_val(pte) })
332 #define __swp_entry_to_pte(x)           ((pte_t) { (x).val })
333 
334 #endif /* !__ASSEMBLY__ */
335 
336 /* Needs to be defined here and not in linux/mm.h, as it is arch dependent */
337 #define kern_addr_valid(addr)   (1)
338 
339 #define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG
340 #define __HAVE_ARCH_PTEP_GET_AND_CLEAR
341 #define __HAVE_ARCH_PTEP_SET_WRPROTECT
342 #define __HAVE_ARCH_PTE_SAME
343 #include <asm-generic/pgtable.h>
344 
345 #endif /* __KERNEL__ */
346 
347 #endif /* _ASM_M32R_PGTABLE_H */
348 

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