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

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

Version: ~ [ linux-5.1-rc5 ] ~ [ linux-5.0.7 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.34 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.111 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.168 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.178 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.138 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.65 ] ~ [ 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-2.6.39.4 ] ~ [ linux-2.6.38.8 ] ~ [ linux-2.6.37.6 ] ~ [ linux-2.6.36.4 ] ~ [ linux-2.6.35.14 ] ~ [ linux-2.6.34.15 ] ~ [ linux-2.6.33.20 ] ~ [ 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 /* pgtable.h: FR-V page table mangling
  2  *
  3  * Copyright (C) 2004 Red Hat, Inc. All Rights Reserved.
  4  * Written by David Howells (dhowells@redhat.com)
  5  *
  6  * This program is free software; you can redistribute it and/or
  7  * modify it under the terms of the GNU General Public License
  8  * as published by the Free Software Foundation; either version
  9  * 2 of the License, or (at your option) any later version.
 10  *
 11  * Derived from:
 12  *      include/asm-m68knommu/pgtable.h
 13  *      include/asm-i386/pgtable.h
 14  */
 15 
 16 #ifndef _ASM_PGTABLE_H
 17 #define _ASM_PGTABLE_H
 18 
 19 #include <asm-generic/5level-fixup.h>
 20 #include <asm/mem-layout.h>
 21 #include <asm/setup.h>
 22 #include <asm/processor.h>
 23 
 24 #ifndef __ASSEMBLY__
 25 #include <linux/threads.h>
 26 #include <linux/slab.h>
 27 #include <linux/list.h>
 28 #include <linux/spinlock.h>
 29 #include <linux/sched.h>
 30 struct vm_area_struct;
 31 #endif
 32 
 33 #ifndef __ASSEMBLY__
 34 #if defined(CONFIG_HIGHPTE)
 35 typedef unsigned long pte_addr_t;
 36 #else
 37 typedef pte_t *pte_addr_t;
 38 #endif
 39 #endif
 40 
 41 /*****************************************************************************/
 42 /*
 43  * MMU-less operation case first
 44  */
 45 #ifndef CONFIG_MMU
 46 
 47 #define pgd_present(pgd)        (1)             /* pages are always present on NO_MM */
 48 #define pgd_none(pgd)           (0)
 49 #define pgd_bad(pgd)            (0)
 50 #define pgd_clear(pgdp)
 51 #define kern_addr_valid(addr)   (1)
 52 #define pmd_offset(a, b)        ((void *) 0)
 53 
 54 #define PAGE_NONE               __pgprot(0)     /* these mean nothing to NO_MM */
 55 #define PAGE_SHARED             __pgprot(0)     /* these mean nothing to NO_MM */
 56 #define PAGE_COPY               __pgprot(0)     /* these mean nothing to NO_MM */
 57 #define PAGE_READONLY           __pgprot(0)     /* these mean nothing to NO_MM */
 58 #define PAGE_KERNEL             __pgprot(0)     /* these mean nothing to NO_MM */
 59 
 60 #define __swp_type(x)           (0)
 61 #define __swp_offset(x)         (0)
 62 #define __swp_entry(typ,off)    ((swp_entry_t) { ((typ) | ((off) << 7)) })
 63 #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) })
 64 #define __swp_entry_to_pte(x)   ((pte_t) { (x).val })
 65 
 66 #define ZERO_PAGE(vaddr)        ({ BUG(); NULL; })
 67 
 68 #define swapper_pg_dir          ((pgd_t *) NULL)
 69 
 70 #define pgtable_cache_init()            do {} while (0)
 71 
 72 #include <asm-generic/pgtable.h>
 73 
 74 #else /* !CONFIG_MMU */
 75 /*****************************************************************************/
 76 /*
 77  * then MMU operation
 78  */
 79 
 80 /*
 81  * ZERO_PAGE is a global shared page that is always zero: used
 82  * for zero-mapped memory areas etc..
 83  */
 84 #ifndef __ASSEMBLY__
 85 extern unsigned long empty_zero_page;
 86 #define ZERO_PAGE(vaddr)        virt_to_page(empty_zero_page)
 87 #endif
 88 
 89 /*
 90  * we use 2-level page tables, folding the PMD (mid-level table) into the PGE (top-level entry)
 91  * [see Documentation/frv/mmu-layout.txt]
 92  *
 93  * Page Directory:
 94  *  - Size: 16KB
 95  *  - 64 PGEs per PGD
 96  *  - Each PGE holds 1 PUD and covers 64MB
 97  *
 98  * Page Upper Directory:
 99  *  - Size: 256B
100  *  - 1 PUE per PUD
101  *  - Each PUE holds 1 PMD and covers 64MB
102  *
103  * Page Mid-Level Directory
104  *  - Size: 256B
105  *  - 1 PME per PMD
106  *  - Each PME holds 64 STEs, all of which point to separate chunks of the same Page Table
107  *  - All STEs are instantiated at the same time
108  *
109  * Page Table
110  *  - Size: 16KB
111  *  - 4096 PTEs per PT
112  *  - Each Linux PT is subdivided into 64 FR451 PT's, each of which holds 64 entries
113  *
114  * Pages
115  *  - Size: 4KB
116  *
117  * total PTEs
118  *      = 1 PML4E * 64 PGEs * 1 PUEs * 1 PMEs * 4096 PTEs
119  *      = 1 PML4E * 64 PGEs * 64 STEs * 64 PTEs/FR451-PT
120  *      = 262144 (or 256 * 1024)
121  */
122 #define PGDIR_SHIFT             26
123 #define PGDIR_SIZE              (1UL << PGDIR_SHIFT)
124 #define PGDIR_MASK              (~(PGDIR_SIZE - 1))
125 #define PTRS_PER_PGD            64
126 
127 #define __PAGETABLE_PUD_FOLDED
128 #define PUD_SHIFT               26
129 #define PTRS_PER_PUD            1
130 #define PUD_SIZE                (1UL << PUD_SHIFT)
131 #define PUD_MASK                (~(PUD_SIZE - 1))
132 #define PUE_SIZE                256
133 
134 #define __PAGETABLE_PMD_FOLDED
135 #define PMD_SHIFT               26
136 #define PMD_SIZE                (1UL << PMD_SHIFT)
137 #define PMD_MASK                (~(PMD_SIZE - 1))
138 #define PTRS_PER_PMD            1
139 #define PME_SIZE                256
140 
141 #define __frv_PT_SIZE           256
142 
143 #define PTRS_PER_PTE            4096
144 
145 #define USER_PGDS_IN_LAST_PML4  (TASK_SIZE / PGDIR_SIZE)
146 #define FIRST_USER_ADDRESS      0UL
147 
148 #define USER_PGD_PTRS           (PAGE_OFFSET >> PGDIR_SHIFT)
149 #define KERNEL_PGD_PTRS         (PTRS_PER_PGD - USER_PGD_PTRS)
150 
151 #define TWOLEVEL_PGDIR_SHIFT    26
152 #define BOOT_USER_PGD_PTRS      (__PAGE_OFFSET >> TWOLEVEL_PGDIR_SHIFT)
153 #define BOOT_KERNEL_PGD_PTRS    (PTRS_PER_PGD - BOOT_USER_PGD_PTRS)
154 
155 #ifndef __ASSEMBLY__
156 
157 extern pgd_t swapper_pg_dir[PTRS_PER_PGD];
158 
159 #define pte_ERROR(e) \
160         printk("%s:%d: bad pte %08lx.\n", __FILE__, __LINE__, (e).pte)
161 #define pmd_ERROR(e) \
162         printk("%s:%d: bad pmd %08lx.\n", __FILE__, __LINE__, pmd_val(e))
163 #define pud_ERROR(e) \
164         printk("%s:%d: bad pud %08lx.\n", __FILE__, __LINE__, pmd_val(pud_val(e)))
165 #define pgd_ERROR(e) \
166         printk("%s:%d: bad pgd %08lx.\n", __FILE__, __LINE__, pmd_val(pud_val(pgd_val(e))))
167 
168 /*
169  * Certain architectures need to do special things when PTEs
170  * within a page table are directly modified.  Thus, the following
171  * hook is made available.
172  */
173 #define set_pte(pteptr, pteval)                         \
174 do {                                                    \
175         *(pteptr) = (pteval);                           \
176         asm volatile("dcf %M0" :: "U"(*pteptr));        \
177 } while(0)
178 #define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval)
179 
180 /*
181  * pgd_offset() returns a (pgd_t *)
182  * pgd_index() is used get the offset into the pgd page's array of pgd_t's;
183  */
184 #define pgd_offset(mm, address) ((mm)->pgd + pgd_index(address))
185 
186 /*
187  * a shortcut which implies the use of the kernel's pgd, instead
188  * of a process's
189  */
190 #define pgd_offset_k(address) pgd_offset(&init_mm, address)
191 
192 /*
193  * The "pgd_xxx()" functions here are trivial for a folded two-level
194  * setup: the pud is never bad, and a pud always exists (as it's folded
195  * into the pgd entry)
196  */
197 static inline int pgd_none(pgd_t pgd)           { return 0; }
198 static inline int pgd_bad(pgd_t pgd)            { return 0; }
199 static inline int pgd_present(pgd_t pgd)        { return 1; }
200 static inline void pgd_clear(pgd_t *pgd)        { }
201 
202 #define pgd_populate(mm, pgd, pud)              do { } while (0)
203 /*
204  * (puds are folded into pgds so this doesn't get actually called,
205  * but the define is needed for a generic inline function.)
206  */
207 #define set_pgd(pgdptr, pgdval)                         \
208 do {                                                    \
209         memcpy((pgdptr), &(pgdval), sizeof(pgd_t));     \
210         asm volatile("dcf %M0" :: "U"(*(pgdptr)));      \
211 } while(0)
212 
213 static inline pud_t *pud_offset(pgd_t *pgd, unsigned long address)
214 {
215         return (pud_t *) pgd;
216 }
217 
218 #define pgd_page(pgd)                           (pud_page((pud_t){ pgd }))
219 #define pgd_page_vaddr(pgd)                     (pud_page_vaddr((pud_t){ pgd }))
220 
221 /*
222  * allocating and freeing a pud is trivial: the 1-entry pud is
223  * inside the pgd, so has no extra memory associated with it.
224  */
225 #define pud_alloc_one(mm, address)              NULL
226 #define pud_free(mm, x)                         do { } while (0)
227 #define __pud_free_tlb(tlb, x, address)         do { } while (0)
228 
229 /*
230  * The "pud_xxx()" functions here are trivial for a folded two-level
231  * setup: the pmd is never bad, and a pmd always exists (as it's folded
232  * into the pud entry)
233  */
234 static inline int pud_none(pud_t pud)           { return 0; }
235 static inline int pud_bad(pud_t pud)            { return 0; }
236 static inline int pud_present(pud_t pud)        { return 1; }
237 static inline void pud_clear(pud_t *pud)        { }
238 
239 #define pud_populate(mm, pmd, pte)              do { } while (0)
240 
241 /*
242  * (pmds are folded into puds so this doesn't get actually called,
243  * but the define is needed for a generic inline function.)
244  */
245 #define set_pud(pudptr, pudval)                 set_pmd((pmd_t *)(pudptr), (pmd_t) { pudval })
246 
247 #define pud_page(pud)                           (pmd_page((pmd_t){ pud }))
248 #define pud_page_vaddr(pud)                     (pmd_page_vaddr((pmd_t){ pud }))
249 
250 /*
251  * (pmds are folded into pgds so this doesn't get actually called,
252  * but the define is needed for a generic inline function.)
253  */
254 extern void __set_pmd(pmd_t *pmdptr, unsigned long __pmd);
255 
256 #define set_pmd(pmdptr, pmdval)                 \
257 do {                                            \
258         __set_pmd((pmdptr), (pmdval).ste[0]);   \
259 } while(0)
260 
261 #define __pmd_index(address)                    0
262 
263 static inline pmd_t *pmd_offset(pud_t *dir, unsigned long address)
264 {
265         return (pmd_t *) dir + __pmd_index(address);
266 }
267 
268 #define pte_same(a, b)          ((a).pte == (b).pte)
269 #define pte_page(x)             (mem_map + ((unsigned long)(((x).pte >> PAGE_SHIFT))))
270 #define pte_none(x)             (!(x).pte)
271 #define pte_pfn(x)              ((unsigned long)(((x).pte >> PAGE_SHIFT)))
272 #define pfn_pte(pfn, prot)      __pte(((pfn) << PAGE_SHIFT) | pgprot_val(prot))
273 #define pfn_pmd(pfn, prot)      __pmd(((pfn) << PAGE_SHIFT) | pgprot_val(prot))
274 
275 #define VMALLOC_VMADDR(x)       ((unsigned long) (x))
276 
277 #endif /* !__ASSEMBLY__ */
278 
279 /*
280  * control flags in AMPR registers and TLB entries
281  */
282 #define _PAGE_BIT_PRESENT       xAMPRx_V_BIT
283 #define _PAGE_BIT_WP            DAMPRx_WP_BIT
284 #define _PAGE_BIT_NOCACHE       xAMPRx_C_BIT
285 #define _PAGE_BIT_SUPER         xAMPRx_S_BIT
286 #define _PAGE_BIT_ACCESSED      xAMPRx_RESERVED8_BIT
287 #define _PAGE_BIT_DIRTY         xAMPRx_M_BIT
288 #define _PAGE_BIT_NOTGLOBAL     xAMPRx_NG_BIT
289 
290 #define _PAGE_PRESENT           xAMPRx_V
291 #define _PAGE_WP                DAMPRx_WP
292 #define _PAGE_NOCACHE           xAMPRx_C
293 #define _PAGE_SUPER             xAMPRx_S
294 #define _PAGE_ACCESSED          xAMPRx_RESERVED8        /* accessed if set */
295 #define _PAGE_DIRTY             xAMPRx_M
296 #define _PAGE_NOTGLOBAL         xAMPRx_NG
297 
298 #define _PAGE_RESERVED_MASK     (xAMPRx_RESERVED8 | xAMPRx_RESERVED13)
299 
300 #define _PAGE_PROTNONE          0x000   /* If not present */
301 
302 #define _PAGE_CHG_MASK          (PTE_MASK | _PAGE_ACCESSED | _PAGE_DIRTY)
303 
304 #define __PGPROT_BASE \
305         (_PAGE_PRESENT | xAMPRx_SS_16Kb | xAMPRx_D | _PAGE_NOTGLOBAL | _PAGE_ACCESSED)
306 
307 #define PAGE_NONE       __pgprot(_PAGE_PROTNONE | _PAGE_ACCESSED)
308 #define PAGE_SHARED     __pgprot(__PGPROT_BASE)
309 #define PAGE_COPY       __pgprot(__PGPROT_BASE | _PAGE_WP)
310 #define PAGE_READONLY   __pgprot(__PGPROT_BASE | _PAGE_WP)
311 
312 #define __PAGE_KERNEL           (__PGPROT_BASE | _PAGE_SUPER | _PAGE_DIRTY)
313 #define __PAGE_KERNEL_NOCACHE   (__PGPROT_BASE | _PAGE_SUPER | _PAGE_DIRTY | _PAGE_NOCACHE)
314 #define __PAGE_KERNEL_RO        (__PGPROT_BASE | _PAGE_SUPER | _PAGE_DIRTY | _PAGE_WP)
315 
316 #define MAKE_GLOBAL(x) __pgprot((x) & ~_PAGE_NOTGLOBAL)
317 
318 #define PAGE_KERNEL             MAKE_GLOBAL(__PAGE_KERNEL)
319 #define PAGE_KERNEL_RO          MAKE_GLOBAL(__PAGE_KERNEL_RO)
320 #define PAGE_KERNEL_NOCACHE     MAKE_GLOBAL(__PAGE_KERNEL_NOCACHE)
321 
322 #define _PAGE_TABLE             (_PAGE_PRESENT | xAMPRx_SS_16Kb)
323 
324 #ifndef __ASSEMBLY__
325 
326 /*
327  * The FR451 can do execute protection by virtue of having separate TLB miss handlers for
328  * instruction access and for data access. However, we don't have enough reserved bits to say
329  * "execute only", so we don't bother. If you can read it, you can execute it and vice versa.
330  */
331 #define __P000  PAGE_NONE
332 #define __P001  PAGE_READONLY
333 #define __P010  PAGE_COPY
334 #define __P011  PAGE_COPY
335 #define __P100  PAGE_READONLY
336 #define __P101  PAGE_READONLY
337 #define __P110  PAGE_COPY
338 #define __P111  PAGE_COPY
339 
340 #define __S000  PAGE_NONE
341 #define __S001  PAGE_READONLY
342 #define __S010  PAGE_SHARED
343 #define __S011  PAGE_SHARED
344 #define __S100  PAGE_READONLY
345 #define __S101  PAGE_READONLY
346 #define __S110  PAGE_SHARED
347 #define __S111  PAGE_SHARED
348 
349 /*
350  * Define this to warn about kernel memory accesses that are
351  * done without a 'access_ok(VERIFY_WRITE,..)'
352  */
353 #undef TEST_ACCESS_OK
354 
355 #define pte_present(x)  (pte_val(x) & _PAGE_PRESENT)
356 #define pte_clear(mm,addr,xp)   do { set_pte_at(mm, addr, xp, __pte(0)); } while (0)
357 
358 #define pmd_none(x)     (!pmd_val(x))
359 #define pmd_present(x)  (pmd_val(x) & _PAGE_PRESENT)
360 #define pmd_bad(x)      (pmd_val(x) & xAMPRx_SS)
361 #define pmd_clear(xp)   do { __set_pmd(xp, 0); } while(0)
362 
363 #define pmd_page_vaddr(pmd) \
364         ((unsigned long) __va(pmd_val(pmd) & PAGE_MASK))
365 
366 #ifndef CONFIG_DISCONTIGMEM
367 #define pmd_page(pmd)   (pfn_to_page(pmd_val(pmd) >> PAGE_SHIFT))
368 #endif
369 
370 #define pages_to_mb(x) ((x) >> (20-PAGE_SHIFT))
371 
372 /*
373  * The following only work if pte_present() is true.
374  * Undefined behaviour if not..
375  */
376 static inline int pte_dirty(pte_t pte)          { return (pte).pte & _PAGE_DIRTY; }
377 static inline int pte_young(pte_t pte)          { return (pte).pte & _PAGE_ACCESSED; }
378 static inline int pte_write(pte_t pte)          { return !((pte).pte & _PAGE_WP); }
379 static inline int pte_special(pte_t pte)        { return 0; }
380 
381 static inline pte_t pte_mkclean(pte_t pte)      { (pte).pte &= ~_PAGE_DIRTY; return pte; }
382 static inline pte_t pte_mkold(pte_t pte)        { (pte).pte &= ~_PAGE_ACCESSED; return pte; }
383 static inline pte_t pte_wrprotect(pte_t pte)    { (pte).pte |= _PAGE_WP; return pte; }
384 static inline pte_t pte_mkdirty(pte_t pte)      { (pte).pte |= _PAGE_DIRTY; return pte; }
385 static inline pte_t pte_mkyoung(pte_t pte)      { (pte).pte |= _PAGE_ACCESSED; return pte; }
386 static inline pte_t pte_mkwrite(pte_t pte)      { (pte).pte &= ~_PAGE_WP; return pte; }
387 static inline pte_t pte_mkspecial(pte_t pte)    { return pte; }
388 
389 static inline int ptep_test_and_clear_young(struct vm_area_struct *vma, unsigned long addr, pte_t *ptep)
390 {
391         int i = test_and_clear_bit(_PAGE_BIT_ACCESSED, ptep);
392         asm volatile("dcf %M0" :: "U"(*ptep));
393         return i;
394 }
395 
396 static inline pte_t ptep_get_and_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
397 {
398         unsigned long x = xchg(&ptep->pte, 0);
399         asm volatile("dcf %M0" :: "U"(*ptep));
400         return __pte(x);
401 }
402 
403 static inline void ptep_set_wrprotect(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
404 {
405         set_bit(_PAGE_BIT_WP, ptep);
406         asm volatile("dcf %M0" :: "U"(*ptep));
407 }
408 
409 /*
410  * Macro to mark a page protection value as "uncacheable"
411  */
412 #define pgprot_noncached(prot) (__pgprot(pgprot_val(prot) | _PAGE_NOCACHE))
413 
414 /*
415  * Conversion functions: convert a page and protection to a page entry,
416  * and a page entry and page directory to the page they refer to.
417  */
418 
419 #define mk_pte(page, pgprot)    pfn_pte(page_to_pfn(page), (pgprot))
420 #define mk_pte_huge(entry)      ((entry).pte_low |= _PAGE_PRESENT | _PAGE_PSE)
421 
422 /* This takes a physical page address that is used by the remapping functions */
423 #define mk_pte_phys(physpage, pgprot)   pfn_pte((physpage) >> PAGE_SHIFT, pgprot)
424 
425 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
426 {
427         pte.pte &= _PAGE_CHG_MASK;
428         pte.pte |= pgprot_val(newprot);
429         return pte;
430 }
431 
432 /* to find an entry in a page-table-directory. */
433 #define pgd_index(address) (((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD - 1))
434 #define pgd_index_k(addr) pgd_index(addr)
435 
436 /* Find an entry in the bottom-level page table.. */
437 #define __pte_index(address) (((address) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1))
438 
439 /*
440  * the pte page can be thought of an array like this: pte_t[PTRS_PER_PTE]
441  *
442  * this macro returns the index of the entry in the pte page which would
443  * control the given virtual address
444  */
445 #define pte_index(address) \
446                 (((address) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1))
447 #define pte_offset_kernel(dir, address) \
448         ((pte_t *) pmd_page_vaddr(*(dir)) +  pte_index(address))
449 
450 #if defined(CONFIG_HIGHPTE)
451 #define pte_offset_map(dir, address) \
452         ((pte_t *)kmap_atomic(pmd_page(*(dir))) + pte_index(address))
453 #define pte_unmap(pte) kunmap_atomic(pte)
454 #else
455 #define pte_offset_map(dir, address) \
456         ((pte_t *)page_address(pmd_page(*(dir))) + pte_index(address))
457 #define pte_unmap(pte) do { } while (0)
458 #endif
459 
460 /*
461  * Handle swap and file entries
462  * - the PTE is encoded in the following format:
463  *      bit 0:          Must be 0 (!_PAGE_PRESENT)
464  *      bits 1-6:       Swap type
465  *      bits 7-31:      Swap offset
466  */
467 #define __swp_type(x)                   (((x).val >> 1) & 0x1f)
468 #define __swp_offset(x)                 ((x).val >> 7)
469 #define __swp_entry(type, offset)       ((swp_entry_t) { ((type) << 1) | ((offset) << 7) })
470 #define __pte_to_swp_entry(_pte)        ((swp_entry_t) { (_pte).pte })
471 #define __swp_entry_to_pte(x)           ((pte_t) { (x).val })
472 
473 /* Needs to be defined here and not in linux/mm.h, as it is arch dependent */
474 #define PageSkip(page)          (0)
475 #define kern_addr_valid(addr)   (1)
476 
477 #define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG
478 #define __HAVE_ARCH_PTEP_GET_AND_CLEAR
479 #define __HAVE_ARCH_PTEP_SET_WRPROTECT
480 #define __HAVE_ARCH_PTE_SAME
481 #include <asm-generic/pgtable.h>
482 
483 /*
484  * preload information about a newly instantiated PTE into the SCR0/SCR1 PGE cache
485  */
486 static inline void update_mmu_cache(struct vm_area_struct *vma, unsigned long address, pte_t *ptep)
487 {
488         struct mm_struct *mm;
489         unsigned long ampr;
490 
491         mm = current->mm;
492         if (mm) {
493                 pgd_t *pge = pgd_offset(mm, address);
494                 pud_t *pue = pud_offset(pge, address);
495                 pmd_t *pme = pmd_offset(pue, address);
496 
497                 ampr = pme->ste[0] & 0xffffff00;
498                 ampr |= xAMPRx_L | xAMPRx_SS_16Kb | xAMPRx_S | xAMPRx_C |
499                         xAMPRx_V;
500         } else {
501                 address = ULONG_MAX;
502                 ampr = 0;
503         }
504 
505         asm volatile("movgs %0,scr0\n"
506                      "movgs %0,scr1\n"
507                      "movgs %1,dampr4\n"
508                      "movgs %1,dampr5\n"
509                      :
510                      : "r"(address), "r"(ampr)
511                      );
512 }
513 
514 #ifdef CONFIG_PROC_FS
515 extern char *proc_pid_status_frv_cxnr(struct mm_struct *mm, char *buffer);
516 #endif
517 
518 extern void __init pgtable_cache_init(void);
519 
520 #endif /* !__ASSEMBLY__ */
521 #endif /* !CONFIG_MMU */
522 
523 #ifndef __ASSEMBLY__
524 extern void __init paging_init(void);
525 #endif /* !__ASSEMBLY__ */
526 #define HAVE_ARCH_UNMAPPED_AREA
527 
528 #endif /* _ASM_PGTABLE_H */
529 

~ [ 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