1 /* pgtable.h: FR-V page table mangling
3 * Copyright (C) 2004 Red Hat, Inc. All Rights Reserved.
4 * Written by David Howells (dhowells@redhat.com)
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.
12 * include/asm-m68knommu/pgtable.h
13 * include/asm-i386/pgtable.h
16 #ifndef _ASM_PGTABLE_H
17 #define _ASM_PGTABLE_H
19 #include <linux/config.h>
20 #include <asm/mem-layout.h>
21 #include <asm/setup.h>
22 #include <asm/processor.h>
25 #include <linux/threads.h>
26 #include <linux/slab.h>
27 #include <linux/list.h>
28 #include <linux/spinlock.h>
30 struct vm_area_struct;
34 #if defined(CONFIG_HIGHPTE)
35 typedef unsigned long pte_addr_t;
37 typedef pte_t *pte_addr_t;
41 /*****************************************************************************/
43 * MMU-less operation case first
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)
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 */
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 })
67 static inline int pte_file(pte_t pte) { return 0; }
70 #define ZERO_PAGE(vaddr) ({ BUG(); NULL; })
72 #define swapper_pg_dir ((pgd_t *) NULL)
74 #define pgtable_cache_init() do {} while(0)
76 #else /* !CONFIG_MMU */
77 /*****************************************************************************/
83 * ZERO_PAGE is a global shared page that is always zero: used
84 * for zero-mapped memory areas etc..
87 extern unsigned long empty_zero_page;
88 #define ZERO_PAGE(vaddr) virt_to_page(empty_zero_page)
92 * we use 2-level page tables, folding the PMD (mid-level table) into the PGE (top-level entry)
93 * [see Documentation/fujitsu/frv/mmu-layout.txt]
98 * - Each PGE holds 1 PUD and covers 64MB
100 * Page Upper Directory:
103 * - Each PUE holds 1 PMD and covers 64MB
105 * Page Mid-Level Directory
108 * - Each PME holds 64 STEs, all of which point to separate chunks of the same Page Table
109 * - All STEs are instantiated at the same time
114 * - Each Linux PT is subdivided into 64 FR451 PT's, each of which holds 64 entries
120 * = 1 PML4E * 64 PGEs * 1 PUEs * 1 PMEs * 4096 PTEs
121 * = 1 PML4E * 64 PGEs * 64 STEs * 64 PTEs/FR451-PT
122 * = 262144 (or 256 * 1024)
124 #define PGDIR_SHIFT 26
125 #define PGDIR_SIZE (1UL << PGDIR_SHIFT)
126 #define PGDIR_MASK (~(PGDIR_SIZE - 1))
127 #define PTRS_PER_PGD 64
130 #define PTRS_PER_PUD 1
131 #define PUD_SIZE (1UL << PUD_SHIFT)
132 #define PUD_MASK (~(PUD_SIZE - 1))
136 #define PMD_SIZE (1UL << PMD_SHIFT)
137 #define PMD_MASK (~(PMD_SIZE - 1))
138 #define PTRS_PER_PMD 1
141 #define __frv_PT_SIZE 256
143 #define PTRS_PER_PTE 4096
145 #define USER_PGDS_IN_LAST_PML4 (TASK_SIZE / PGDIR_SIZE)
146 #define FIRST_USER_ADDRESS 0
148 #define USER_PGD_PTRS (PAGE_OFFSET >> PGDIR_SHIFT)
149 #define KERNEL_PGD_PTRS (PTRS_PER_PGD - USER_PGD_PTRS)
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)
157 extern pgd_t swapper_pg_dir[PTRS_PER_PGD];
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))))
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.
173 #define set_pte(pteptr, pteval) \
175 *(pteptr) = (pteval); \
176 asm volatile("dcf %M0" :: "U"(*pteptr)); \
178 #define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval)
180 #define set_pte_atomic(pteptr, pteval) set_pte((pteptr), (pteval))
183 * pgd_offset() returns a (pgd_t *)
184 * pgd_index() is used get the offset into the pgd page's array of pgd_t's;
186 #define pgd_offset(mm, address) ((mm)->pgd + pgd_index(address))
189 * a shortcut which implies the use of the kernel's pgd, instead
192 #define pgd_offset_k(address) pgd_offset(&init_mm, address)
195 * The "pgd_xxx()" functions here are trivial for a folded two-level
196 * setup: the pud is never bad, and a pud always exists (as it's folded
197 * into the pgd entry)
199 static inline int pgd_none(pgd_t pgd) { return 0; }
200 static inline int pgd_bad(pgd_t pgd) { return 0; }
201 static inline int pgd_present(pgd_t pgd) { return 1; }
202 static inline void pgd_clear(pgd_t *pgd) { }
204 #define pgd_populate(mm, pgd, pud) do { } while (0)
206 * (puds are folded into pgds so this doesn't get actually called,
207 * but the define is needed for a generic inline function.)
209 #define set_pgd(pgdptr, pgdval) \
211 memcpy((pgdptr), &(pgdval), sizeof(pgd_t)); \
212 asm volatile("dcf %M0" :: "U"(*(pgdptr))); \
215 static inline pud_t *pud_offset(pgd_t *pgd, unsigned long address)
217 return (pud_t *) pgd;
220 #define pgd_page(pgd) (pud_page((pud_t){ pgd }))
221 #define pgd_page_kernel(pgd) (pud_page_kernel((pud_t){ pgd }))
224 * allocating and freeing a pud is trivial: the 1-entry pud is
225 * inside the pgd, so has no extra memory associated with it.
227 #define pud_alloc_one(mm, address) NULL
228 #define pud_free(x) do { } while (0)
229 #define __pud_free_tlb(tlb, x) do { } while (0)
232 * The "pud_xxx()" functions here are trivial for a folded two-level
233 * setup: the pmd is never bad, and a pmd always exists (as it's folded
234 * into the pud entry)
236 static inline int pud_none(pud_t pud) { return 0; }
237 static inline int pud_bad(pud_t pud) { return 0; }
238 static inline int pud_present(pud_t pud) { return 1; }
239 static inline void pud_clear(pud_t *pud) { }
241 #define pud_populate(mm, pmd, pte) do { } while (0)
244 * (pmds are folded into puds so this doesn't get actually called,
245 * but the define is needed for a generic inline function.)
247 #define set_pud(pudptr, pudval) set_pmd((pmd_t *)(pudptr), (pmd_t) { pudval })
249 #define pud_page(pud) (pmd_page((pmd_t){ pud }))
250 #define pud_page_kernel(pud) (pmd_page_kernel((pmd_t){ pud }))
253 * (pmds are folded into pgds so this doesn't get actually called,
254 * but the define is needed for a generic inline function.)
256 extern void __set_pmd(pmd_t *pmdptr, unsigned long __pmd);
258 #define set_pmd(pmdptr, pmdval) \
260 __set_pmd((pmdptr), (pmdval).ste[0]); \
263 #define __pmd_index(address) 0
265 static inline pmd_t *pmd_offset(pud_t *dir, unsigned long address)
267 return (pmd_t *) dir + __pmd_index(address);
270 #define pte_same(a, b) ((a).pte == (b).pte)
271 #define pte_page(x) (mem_map + ((unsigned long)(((x).pte >> PAGE_SHIFT))))
272 #define pte_none(x) (!(x).pte)
273 #define pte_pfn(x) ((unsigned long)(((x).pte >> PAGE_SHIFT)))
274 #define pfn_pte(pfn, prot) __pte(((pfn) << PAGE_SHIFT) | pgprot_val(prot))
275 #define pfn_pmd(pfn, prot) __pmd(((pfn) << PAGE_SHIFT) | pgprot_val(prot))
277 #define VMALLOC_VMADDR(x) ((unsigned long) (x))
279 #endif /* !__ASSEMBLY__ */
282 * control flags in AMPR registers and TLB entries
284 #define _PAGE_BIT_PRESENT xAMPRx_V_BIT
285 #define _PAGE_BIT_WP DAMPRx_WP_BIT
286 #define _PAGE_BIT_NOCACHE xAMPRx_C_BIT
287 #define _PAGE_BIT_SUPER xAMPRx_S_BIT
288 #define _PAGE_BIT_ACCESSED xAMPRx_RESERVED8_BIT
289 #define _PAGE_BIT_DIRTY xAMPRx_M_BIT
290 #define _PAGE_BIT_NOTGLOBAL xAMPRx_NG_BIT
292 #define _PAGE_PRESENT xAMPRx_V
293 #define _PAGE_WP DAMPRx_WP
294 #define _PAGE_NOCACHE xAMPRx_C
295 #define _PAGE_SUPER xAMPRx_S
296 #define _PAGE_ACCESSED xAMPRx_RESERVED8 /* accessed if set */
297 #define _PAGE_DIRTY xAMPRx_M
298 #define _PAGE_NOTGLOBAL xAMPRx_NG
300 #define _PAGE_RESERVED_MASK (xAMPRx_RESERVED8 | xAMPRx_RESERVED13)
302 #define _PAGE_FILE 0x002 /* set:pagecache unset:swap */
303 #define _PAGE_PROTNONE 0x000 /* If not present */
305 #define _PAGE_CHG_MASK (PTE_MASK | _PAGE_ACCESSED | _PAGE_DIRTY)
307 #define __PGPROT_BASE \
308 (_PAGE_PRESENT | xAMPRx_SS_16Kb | xAMPRx_D | _PAGE_NOTGLOBAL | _PAGE_ACCESSED)
310 #define PAGE_NONE __pgprot(_PAGE_PROTNONE | _PAGE_ACCESSED)
311 #define PAGE_SHARED __pgprot(__PGPROT_BASE)
312 #define PAGE_COPY __pgprot(__PGPROT_BASE | _PAGE_WP)
313 #define PAGE_READONLY __pgprot(__PGPROT_BASE | _PAGE_WP)
315 #define __PAGE_KERNEL (__PGPROT_BASE | _PAGE_SUPER | _PAGE_DIRTY)
316 #define __PAGE_KERNEL_NOCACHE (__PGPROT_BASE | _PAGE_SUPER | _PAGE_DIRTY | _PAGE_NOCACHE)
317 #define __PAGE_KERNEL_RO (__PGPROT_BASE | _PAGE_SUPER | _PAGE_DIRTY | _PAGE_WP)
319 #define MAKE_GLOBAL(x) __pgprot((x) & ~_PAGE_NOTGLOBAL)
321 #define PAGE_KERNEL MAKE_GLOBAL(__PAGE_KERNEL)
322 #define PAGE_KERNEL_RO MAKE_GLOBAL(__PAGE_KERNEL_RO)
323 #define PAGE_KERNEL_NOCACHE MAKE_GLOBAL(__PAGE_KERNEL_NOCACHE)
325 #define _PAGE_TABLE (_PAGE_PRESENT | xAMPRx_SS_16Kb)
330 * The FR451 can do execute protection by virtue of having separate TLB miss handlers for
331 * instruction access and for data access. However, we don't have enough reserved bits to say
332 * "execute only", so we don't bother. If you can read it, you can execute it and vice versa.
334 #define __P000 PAGE_NONE
335 #define __P001 PAGE_READONLY
336 #define __P010 PAGE_COPY
337 #define __P011 PAGE_COPY
338 #define __P100 PAGE_READONLY
339 #define __P101 PAGE_READONLY
340 #define __P110 PAGE_COPY
341 #define __P111 PAGE_COPY
343 #define __S000 PAGE_NONE
344 #define __S001 PAGE_READONLY
345 #define __S010 PAGE_SHARED
346 #define __S011 PAGE_SHARED
347 #define __S100 PAGE_READONLY
348 #define __S101 PAGE_READONLY
349 #define __S110 PAGE_SHARED
350 #define __S111 PAGE_SHARED
353 * Define this to warn about kernel memory accesses that are
354 * done without a 'access_ok(VERIFY_WRITE,..)'
356 #undef TEST_ACCESS_OK
358 #define pte_present(x) (pte_val(x) & _PAGE_PRESENT)
359 #define pte_clear(mm,addr,xp) do { set_pte_at(mm, addr, xp, __pte(0)); } while (0)
361 #define pmd_none(x) (!pmd_val(x))
362 #define pmd_present(x) (pmd_val(x) & _PAGE_PRESENT)
363 #define pmd_bad(x) (pmd_val(x) & xAMPRx_SS)
364 #define pmd_clear(xp) do { __set_pmd(xp, 0); } while(0)
366 #define pmd_page_kernel(pmd) \
367 ((unsigned long) __va(pmd_val(pmd) & PAGE_MASK))
369 #ifndef CONFIG_DISCONTIGMEM
370 #define pmd_page(pmd) (pfn_to_page(pmd_val(pmd) >> PAGE_SHIFT))
373 #define pages_to_mb(x) ((x) >> (20-PAGE_SHIFT))
376 * The following only work if pte_present() is true.
377 * Undefined behaviour if not..
379 static inline int pte_read(pte_t pte) { return !((pte).pte & _PAGE_SUPER); }
380 static inline int pte_exec(pte_t pte) { return !((pte).pte & _PAGE_SUPER); }
381 static inline int pte_dirty(pte_t pte) { return (pte).pte & _PAGE_DIRTY; }
382 static inline int pte_young(pte_t pte) { return (pte).pte & _PAGE_ACCESSED; }
383 static inline int pte_write(pte_t pte) { return !((pte).pte & _PAGE_WP); }
385 static inline pte_t pte_rdprotect(pte_t pte) { (pte).pte |= _PAGE_SUPER; return pte; }
386 static inline pte_t pte_exprotect(pte_t pte) { (pte).pte |= _PAGE_SUPER; return pte; }
387 static inline pte_t pte_mkclean(pte_t pte) { (pte).pte &= ~_PAGE_DIRTY; return pte; }
388 static inline pte_t pte_mkold(pte_t pte) { (pte).pte &= ~_PAGE_ACCESSED; return pte; }
389 static inline pte_t pte_wrprotect(pte_t pte) { (pte).pte |= _PAGE_WP; return pte; }
390 static inline pte_t pte_mkread(pte_t pte) { (pte).pte &= ~_PAGE_SUPER; return pte; }
391 static inline pte_t pte_mkexec(pte_t pte) { (pte).pte &= ~_PAGE_SUPER; return pte; }
392 static inline pte_t pte_mkdirty(pte_t pte) { (pte).pte |= _PAGE_DIRTY; return pte; }
393 static inline pte_t pte_mkyoung(pte_t pte) { (pte).pte |= _PAGE_ACCESSED; return pte; }
394 static inline pte_t pte_mkwrite(pte_t pte) { (pte).pte &= ~_PAGE_WP; return pte; }
396 static inline int ptep_test_and_clear_dirty(struct vm_area_struct *vma, unsigned long addr, pte_t *ptep)
398 int i = test_and_clear_bit(_PAGE_BIT_DIRTY, ptep);
399 asm volatile("dcf %M0" :: "U"(*ptep));
403 static inline int ptep_test_and_clear_young(struct vm_area_struct *vma, unsigned long addr, pte_t *ptep)
405 int i = test_and_clear_bit(_PAGE_BIT_ACCESSED, ptep);
406 asm volatile("dcf %M0" :: "U"(*ptep));
410 static inline pte_t ptep_get_and_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
412 unsigned long x = xchg(&ptep->pte, 0);
413 asm volatile("dcf %M0" :: "U"(*ptep));
417 static inline void ptep_set_wrprotect(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
419 set_bit(_PAGE_BIT_WP, ptep);
420 asm volatile("dcf %M0" :: "U"(*ptep));
424 * Conversion functions: convert a page and protection to a page entry,
425 * and a page entry and page directory to the page they refer to.
428 #define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot))
429 #define mk_pte_huge(entry) ((entry).pte_low |= _PAGE_PRESENT | _PAGE_PSE)
431 /* This takes a physical page address that is used by the remapping functions */
432 #define mk_pte_phys(physpage, pgprot) pfn_pte((physpage) >> PAGE_SHIFT, pgprot)
434 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
436 pte.pte &= _PAGE_CHG_MASK;
437 pte.pte |= pgprot_val(newprot);
441 /* to find an entry in a page-table-directory. */
442 #define pgd_index(address) (((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD - 1))
443 #define pgd_index_k(addr) pgd_index(addr)
445 /* Find an entry in the bottom-level page table.. */
446 #define __pte_index(address) (((address) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1))
449 * the pte page can be thought of an array like this: pte_t[PTRS_PER_PTE]
451 * this macro returns the index of the entry in the pte page which would
452 * control the given virtual address
454 #define pte_index(address) \
455 (((address) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1))
456 #define pte_offset_kernel(dir, address) \
457 ((pte_t *) pmd_page_kernel(*(dir)) + pte_index(address))
459 #if defined(CONFIG_HIGHPTE)
460 #define pte_offset_map(dir, address) \
461 ((pte_t *)kmap_atomic(pmd_page(*(dir)),KM_PTE0) + pte_index(address))
462 #define pte_offset_map_nested(dir, address) \
463 ((pte_t *)kmap_atomic(pmd_page(*(dir)),KM_PTE1) + pte_index(address))
464 #define pte_unmap(pte) kunmap_atomic(pte, KM_PTE0)
465 #define pte_unmap_nested(pte) kunmap_atomic((pte), KM_PTE1)
467 #define pte_offset_map(dir, address) \
468 ((pte_t *)page_address(pmd_page(*(dir))) + pte_index(address))
469 #define pte_offset_map_nested(dir, address) pte_offset_map((dir), (address))
470 #define pte_unmap(pte) do { } while (0)
471 #define pte_unmap_nested(pte) do { } while (0)
475 * Handle swap and file entries
476 * - the PTE is encoded in the following format:
477 * bit 0: Must be 0 (!_PAGE_PRESENT)
478 * bit 1: Type: 0 for swap, 1 for file (_PAGE_FILE)
479 * bits 2-7: Swap type
480 * bits 8-31: Swap offset
481 * bits 2-31: File pgoff
483 #define __swp_type(x) (((x).val >> 2) & 0x1f)
484 #define __swp_offset(x) ((x).val >> 8)
485 #define __swp_entry(type, offset) ((swp_entry_t) { ((type) << 2) | ((offset) << 8) })
486 #define __pte_to_swp_entry(pte) ((swp_entry_t) { (pte).pte })
487 #define __swp_entry_to_pte(x) ((pte_t) { (x).val })
489 static inline int pte_file(pte_t pte)
491 return pte.pte & _PAGE_FILE;
494 #define PTE_FILE_MAX_BITS 29
496 #define pte_to_pgoff(PTE) ((PTE).pte >> 2)
497 #define pgoff_to_pte(off) __pte((off) << 2 | _PAGE_FILE)
499 /* Needs to be defined here and not in linux/mm.h, as it is arch dependent */
500 #define PageSkip(page) (0)
501 #define kern_addr_valid(addr) (1)
503 #define io_remap_pfn_range(vma, vaddr, pfn, size, prot) \
504 remap_pfn_range(vma, vaddr, pfn, size, prot)
506 #define MK_IOSPACE_PFN(space, pfn) (pfn)
507 #define GET_IOSPACE(pfn) 0
508 #define GET_PFN(pfn) (pfn)
510 #define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG
511 #define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_DIRTY
512 #define __HAVE_ARCH_PTEP_GET_AND_CLEAR
513 #define __HAVE_ARCH_PTEP_SET_WRPROTECT
514 #define __HAVE_ARCH_PTE_SAME
515 #include <asm-generic/pgtable.h>
518 * preload information about a newly instantiated PTE into the SCR0/SCR1 PGE cache
520 static inline void update_mmu_cache(struct vm_area_struct *vma, unsigned long address, pte_t pte)
523 pgd_t *pge = pgd_offset(current->mm, address);
524 pud_t *pue = pud_offset(pge, address);
525 pmd_t *pme = pmd_offset(pue, address);
527 ampr = pme->ste[0] & 0xffffff00;
528 ampr |= xAMPRx_L | xAMPRx_SS_16Kb | xAMPRx_S | xAMPRx_C | xAMPRx_V;
530 asm volatile("movgs %0,scr0\n"
535 : "r"(address), "r"(ampr)
539 #ifdef CONFIG_PROC_FS
540 extern char *proc_pid_status_frv_cxnr(struct mm_struct *mm, char *buffer);
543 extern void __init pgtable_cache_init(void);
545 #endif /* !__ASSEMBLY__ */
546 #endif /* !CONFIG_MMU */
549 extern void __init paging_init(void);
550 #endif /* !__ASSEMBLY__ */
552 #endif /* _ASM_PGTABLE_H */