Root/target/linux/coldfire/files-2.6.31/arch/m68k/include/asm/cf_pgtable.h

1/*
2 * Copyright 2007-2009 Freescale Semiconductor, Inc. All Rights Reserved.
3 */
4
5#ifndef _CF_PGTABLE_H
6#define _CF_PGTABLE_H
7
8#include <asm/cfmmu.h>
9#include <asm/page.h>
10
11#ifndef __ASSEMBLY__
12#include <asm/virtconvert.h>
13#include <linux/linkage.h>
14
15/* For virtual address to physical address conversion */
16#define VTOP(addr) __pa(addr)
17#define PTOV(addr) __va(addr)
18
19
20#endif /* !__ASSEMBLY__ */
21
22/* Page protection values within PTE. */
23
24/* MMUDR bits, in proper place. */
25#define CF_PAGE_LOCKED (0x00000002)
26#define CF_PAGE_EXEC (0x00000004)
27#define CF_PAGE_WRITABLE (0x00000008)
28#define CF_PAGE_READABLE (0x00000010)
29#define CF_PAGE_SYSTEM (0x00000020)
30#define CF_PAGE_COPYBACK (0x00000040)
31#define CF_PAGE_NOCACHE (0x00000080)
32
33#define CF_CACHEMASK (~0x00000040)
34#define CF_PAGE_MMUDR_MASK (0x000000fe)
35
36#define _PAGE_NOCACHE030 (CF_PAGE_NOCACHE)
37
38/* MMUTR bits, need shifting down. */
39#define CF_PAGE_VALID (0x00000400)
40#define CF_PAGE_SHARED (0x00000800)
41
42#define CF_PAGE_MMUTR_MASK (0x00000c00)
43#define CF_PAGE_MMUTR_SHIFT (10)
44#define CF_ASID_MMU_SHIFT (2)
45
46/* Fake bits, not implemented in CF, will get masked out before
47   hitting hardware, and might go away altogether once this port is
48   complete. */
49#if PAGE_SHIFT < 13
50#error COLDFIRE Error: Pages must be at least 8k in size
51#endif
52#define CF_PAGE_ACCESSED (0x00001000)
53#define CF_PAGE_FILE (0x00000200)
54#define CF_PAGE_DIRTY (0x00000001)
55
56#define _PAGE_CACHE040 0x020 /* 68040 cache mode, cachable, copyback */
57#define _PAGE_NOCACHE_S 0x040 /* 68040 no-cache mode, serialized */
58#define _PAGE_NOCACHE 0x060 /* 68040 cache mode, non-serialized */
59#define _PAGE_CACHE040W 0x000 /* 68040 cache mode, cachable, write-through */
60#define _DESCTYPE_MASK 0x003
61#define _CACHEMASK040 (~0x060)
62#define _PAGE_GLOBAL040 0x400 /* 68040 global bit, used for kva descs */
63
64
65/* Externally used page protection values. */
66#define _PAGE_PRESENT (CF_PAGE_VALID)
67#define _PAGE_ACCESSED (CF_PAGE_ACCESSED)
68#define _PAGE_DIRTY (CF_PAGE_DIRTY)
69#define _PAGE_READWRITE (CF_PAGE_WRITABLE \
70            | CF_PAGE_READABLE \
71            | CF_PAGE_SHARED \
72            | CF_PAGE_SYSTEM)
73
74/* Compound page protection values. */
75#define PAGE_NONE __pgprot(CF_PAGE_VALID \
76                 | CF_PAGE_ACCESSED)
77
78#define PAGE_SHARED __pgprot(CF_PAGE_VALID \
79                 | CF_PAGE_READABLE \
80                 | CF_PAGE_WRITABLE \
81                 | CF_PAGE_ACCESSED)
82
83#define PAGE_INIT __pgprot(CF_PAGE_VALID \
84                 | CF_PAGE_WRITABLE \
85                 | CF_PAGE_READABLE \
86                 | CF_PAGE_EXEC \
87                 | CF_PAGE_SYSTEM \
88                 | CF_PAGE_SHARED)
89
90#define PAGE_KERNEL __pgprot(CF_PAGE_VALID \
91                 | CF_PAGE_WRITABLE \
92                 | CF_PAGE_READABLE \
93                 | CF_PAGE_EXEC \
94                 | CF_PAGE_SYSTEM \
95                 | CF_PAGE_SHARED \
96                 | CF_PAGE_ACCESSED)
97
98#define PAGE_COPY __pgprot(CF_PAGE_VALID \
99                 | CF_PAGE_ACCESSED \
100                 | CF_PAGE_READABLE)
101
102/*
103 * Page protections for initialising protection_map. See mm/mmap.c
104 * for use. In general, the bit positions are xwr, and P-items are
105 * private, the S-items are shared.
106 */
107
108#define __P000 PAGE_NONE
109#define __P100 __pgprot(CF_PAGE_VALID \
110             | CF_PAGE_ACCESSED \
111             | CF_PAGE_EXEC)
112#define __P010 __pgprot(CF_PAGE_VALID \
113             | CF_PAGE_WRITABLE \
114             | CF_PAGE_ACCESSED)
115#define __P110 __pgprot(CF_PAGE_VALID \
116             | CF_PAGE_ACCESSED \
117             | CF_PAGE_WRITABLE \
118             | CF_PAGE_EXEC)
119#define __P001 __pgprot(CF_PAGE_VALID \
120             | CF_PAGE_ACCESSED \
121             | CF_PAGE_READABLE)
122#define __P101 __pgprot(CF_PAGE_VALID \
123             | CF_PAGE_ACCESSED \
124             | CF_PAGE_READABLE \
125             | CF_PAGE_EXEC)
126#define __P011 __pgprot(CF_PAGE_VALID \
127             | CF_PAGE_READABLE \
128             | CF_PAGE_WRITABLE \
129             | CF_PAGE_ACCESSED)
130#define __P111 __pgprot(CF_PAGE_VALID \
131             | CF_PAGE_ACCESSED \
132             | CF_PAGE_WRITABLE \
133             | CF_PAGE_READABLE \
134             | CF_PAGE_EXEC)
135
136#define __S000 PAGE_NONE
137#define __S100 __pgprot(CF_PAGE_VALID \
138             | CF_PAGE_ACCESSED \
139             | CF_PAGE_EXEC)
140#define __S010 PAGE_SHARED
141#define __S110 __pgprot(CF_PAGE_VALID \
142             | CF_PAGE_ACCESSED \
143             | CF_PAGE_WRITABLE \
144             | CF_PAGE_EXEC)
145#define __S001 __pgprot(CF_PAGE_VALID \
146             | CF_PAGE_ACCESSED \
147             | CF_PAGE_READABLE)
148#define __S101 __pgprot(CF_PAGE_VALID \
149             | CF_PAGE_ACCESSED \
150             | CF_PAGE_READABLE \
151             | CF_PAGE_EXEC)
152#define __S011 PAGE_SHARED
153#define __S111 __pgprot(CF_PAGE_VALID \
154             | CF_PAGE_ACCESSED \
155             | CF_PAGE_READABLE \
156             | CF_PAGE_WRITABLE \
157             | CF_PAGE_EXEC)
158
159#define PTE_MASK PAGE_MASK
160#define CF_PAGE_CHG_MASK (PTE_MASK | CF_PAGE_ACCESSED | CF_PAGE_DIRTY)
161
162#ifndef __ASSEMBLY__
163
164/*
165 * Conversion functions: convert a page and protection to a page entry,
166 * and a page entry and page directory to the page they refer to.
167 */
168#define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot))
169
170extern inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
171{
172    pte_val(pte) = (pte_val(pte) & CF_PAGE_CHG_MASK) | pgprot_val(newprot);
173    return pte;
174}
175
176#define pmd_set(pmdp, ptep) do {} while (0)
177
178static inline void pgd_set(pgd_t *pgdp, pmd_t *pmdp)
179{
180    pgd_val(*pgdp) = virt_to_phys(pmdp);
181}
182
183#define __pte_page(pte) \
184    ((unsigned long) ((pte_val(pte) & CF_PAGE_PGNUM_MASK) + PAGE_OFFSET))
185#define __pmd_page(pmd) ((unsigned long) (pmd_val(pmd)))
186
187extern inline int pte_none(pte_t pte)
188{
189    return !pte_val(pte);
190}
191extern inline int pte_present(pte_t pte)
192{
193    return pte_val(pte) & CF_PAGE_VALID;
194}
195extern inline void pte_clear(struct mm_struct *mm, unsigned long addr,
196    pte_t *ptep)
197{
198    pte_val(*ptep) = 0;
199}
200
201#define pte_pagenr(pte) ((__pte_page(pte) - PAGE_OFFSET) >> PAGE_SHIFT)
202#define pte_page(pte) virt_to_page(__pte_page(pte))
203
204extern inline int pmd_none2(pmd_t *pmd) { return !pmd_val(*pmd); }
205#define pmd_none(pmd) pmd_none2(&(pmd))
206extern inline int pmd_bad2(pmd_t *pmd) { return 0; }
207#define pmd_bad(pmd) pmd_bad2(&(pmd))
208#define pmd_present(pmd) (!pmd_none2(&(pmd)))
209extern inline void pmd_clear(pmd_t *pmdp) { pmd_val(*pmdp) = 0; }
210
211extern inline int pgd_none(pgd_t pgd) { return 0; }
212extern inline int pgd_bad(pgd_t pgd) { return 0; }
213extern inline int pgd_present(pgd_t pgd) { return 1; }
214extern inline void pgd_clear(pgd_t *pgdp) {}
215
216
217#define pte_ERROR(e) \
218    printk(KERN_ERR "%s:%d: bad pte %08lx.\n", \
219    __FILE__, __LINE__, pte_val(e))
220#define pmd_ERROR(e) \
221    printk(KERN_ERR "%s:%d: bad pmd %08lx.\n", \
222    __FILE__, __LINE__, pmd_val(e))
223#define pgd_ERROR(e) \
224    printk(KERN_ERR "%s:%d: bad pgd %08lx.\n", \
225    __FILE__, __LINE__, pgd_val(e))
226
227
228/*
229 * The following only work if pte_present() is true.
230 * Undefined behaviour if not...
231 * [we have the full set here even if they don't change from m68k]
232 */
233extern inline int pte_read(pte_t pte) \
234    { return pte_val(pte) & CF_PAGE_READABLE; }
235extern inline int pte_write(pte_t pte) \
236    { return pte_val(pte) & CF_PAGE_WRITABLE; }
237extern inline int pte_exec(pte_t pte) \
238    { return pte_val(pte) & CF_PAGE_EXEC; }
239extern inline int pte_dirty(pte_t pte) \
240    { return pte_val(pte) & CF_PAGE_DIRTY; }
241extern inline int pte_young(pte_t pte) \
242    { return pte_val(pte) & CF_PAGE_ACCESSED; }
243extern inline int pte_file(pte_t pte) \
244    { return pte_val(pte) & CF_PAGE_FILE; }
245static inline int pte_special(pte_t pte) { return 0; }
246
247
248extern inline pte_t pte_wrprotect(pte_t pte) \
249    { pte_val(pte) &= ~CF_PAGE_WRITABLE; return pte; }
250extern inline pte_t pte_rdprotect(pte_t pte) \
251    { pte_val(pte) &= ~CF_PAGE_READABLE; return pte; }
252extern inline pte_t pte_exprotect(pte_t pte) \
253    { pte_val(pte) &= ~CF_PAGE_EXEC; return pte; }
254extern inline pte_t pte_mkclean(pte_t pte) \
255    { pte_val(pte) &= ~CF_PAGE_DIRTY; return pte; }
256extern inline pte_t pte_mkold(pte_t pte) \
257    { pte_val(pte) &= ~CF_PAGE_ACCESSED; return pte; }
258extern inline pte_t pte_mkwrite(pte_t pte) \
259    { pte_val(pte) |= CF_PAGE_WRITABLE; return pte; }
260extern inline pte_t pte_mkread(pte_t pte) \
261    { pte_val(pte) |= CF_PAGE_READABLE; return pte; }
262extern inline pte_t pte_mkexec(pte_t pte) \
263    { pte_val(pte) |= CF_PAGE_EXEC; return pte; }
264extern inline pte_t pte_mkdirty(pte_t pte) \
265    { pte_val(pte) |= CF_PAGE_DIRTY; return pte; }
266extern inline pte_t pte_mkyoung(pte_t pte) \
267    { pte_val(pte) |= CF_PAGE_ACCESSED; return pte; }
268extern inline pte_t pte_mknocache(pte_t pte) \
269    { pte_val(pte) |= 0x80 | (pte_val(pte) & ~0x40); return pte; }
270extern inline pte_t pte_mkcache(pte_t pte) \
271    { pte_val(pte) &= ~CF_PAGE_NOCACHE; return pte; }
272static inline pte_t pte_mkspecial(pte_t pte) { return pte; }
273
274
275#define swapper_pg_dir kernel_pg_dir
276extern pgd_t kernel_pg_dir[PTRS_PER_PGD];
277
278/* Find an entry in a pagetable directory. */
279#define pgd_index(address) ((address) >> PGDIR_SHIFT)
280
281#define pgd_offset(mm, address) ((mm)->pgd + pgd_index(address))
282
283/* Find an entry in a kernel pagetable directory. */
284#define pgd_offset_k(address) pgd_offset(&init_mm, address)
285
286/* Find an entry in the second-level pagetable. */
287extern inline pmd_t *pmd_offset(pgd_t *pgd, unsigned long address)
288{
289    return (pmd_t *) pgd;
290}
291
292/* Find an entry in the third-level pagetable. */
293#define __pte_offset(address) ((address >> PAGE_SHIFT) & (PTRS_PER_PTE - 1))
294#define pte_offset_kernel(dir, address) ((pte_t *) __pmd_page(*(dir)) + \
295                      __pte_offset(address))
296
297/* Disable caching for page at given kernel virtual address. */
298static inline void nocache_page(void *vaddr)
299{
300    pgd_t *dir;
301    pmd_t *pmdp;
302    pte_t *ptep;
303    unsigned long addr = (unsigned long)vaddr;
304
305    dir = pgd_offset_k(addr);
306    pmdp = pmd_offset(dir, addr);
307    ptep = pte_offset_kernel(pmdp, addr);
308    *ptep = pte_mknocache(*ptep);
309}
310
311/* Enable caching for page at given kernel virtual address. */
312static inline void cache_page(void *vaddr)
313{
314    pgd_t *dir;
315    pmd_t *pmdp;
316    pte_t *ptep;
317    unsigned long addr = (unsigned long)vaddr;
318
319    dir = pgd_offset_k(addr);
320    pmdp = pmd_offset(dir, addr);
321    ptep = pte_offset_kernel(pmdp, addr);
322    *ptep = pte_mkcache(*ptep);
323}
324
325#define PTE_FILE_MAX_BITS 21
326#define PTE_FILE_SHIFT 11
327
328static inline unsigned long pte_to_pgoff(pte_t pte)
329{
330    return pte_val(pte) >> PTE_FILE_SHIFT;
331}
332
333static inline pte_t pgoff_to_pte(unsigned pgoff)
334{
335    pte_t pte = __pte((pgoff << PTE_FILE_SHIFT) + CF_PAGE_FILE);
336    return pte;
337}
338
339/* Encode and de-code a swap entry (must be !pte_none(e) && !pte_present(e)) */
340#define __swp_entry(type, offset) ((swp_entry_t) { (type) | \
341                   (offset << PTE_FILE_SHIFT) })
342#define __swp_type(x) ((x).val & 0xFF)
343#define __swp_offset(x) ((x).val >> PTE_FILE_SHIFT)
344#define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) })
345#define __swp_entry_to_pte(x) (__pte((x).val))
346
347#define pmd_page(pmd) (pfn_to_page(pmd_val(pmd) >> PAGE_SHIFT))
348
349#define pte_offset_map(pmdp, address) ((pte_t *)__pmd_page(*pmdp) + \
350                       __pte_offset(address))
351#define pte_offset_map_nested(pmdp, address) pte_offset_map(pmdp, address)
352#define pte_unmap(pte) kunmap(pte)
353#define pte_unmap_nested(pte) kunmap(pte)
354
355#define pfn_pte(pfn, prot) __pte(((pfn) << PAGE_SHIFT) | pgprot_val(prot))
356#define pte_pfn(pte) (pte_val(pte) >> PAGE_SHIFT)
357
358
359#endif /* !__ASSEMBLY__ */
360#endif /* !_CF_PGTABLE_H */
361

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