1#ifndef _MCF_PGTABLE_H
2#define _MCF_PGTABLE_H
3
4#include <asm/mcfmmu.h>
5#include <asm/page.h>
6
7/*
8 * MMUDR bits, in proper place. We write these directly into the MMUDR
9 * after masking from the pte.
10 */
11#define CF_PAGE_LOCKED		MMUDR_LK	/* 0x00000002 */
12#define CF_PAGE_EXEC		MMUDR_X		/* 0x00000004 */
13#define CF_PAGE_WRITABLE	MMUDR_W		/* 0x00000008 */
14#define CF_PAGE_READABLE	MMUDR_R		/* 0x00000010 */
15#define CF_PAGE_SYSTEM		MMUDR_SP	/* 0x00000020 */
16#define CF_PAGE_COPYBACK	MMUDR_CM_CCB	/* 0x00000040 */
17#define CF_PAGE_NOCACHE		MMUDR_CM_NCP	/* 0x00000080 */
18
19#define CF_CACHEMASK		(~MMUDR_CM_CCB)
20#define CF_PAGE_MMUDR_MASK	0x000000fe
21
22#define _PAGE_NOCACHE030	CF_PAGE_NOCACHE
23
24/*
25 * MMUTR bits, need shifting down.
26 */
27#define CF_PAGE_MMUTR_MASK	0x00000c00
28#define CF_PAGE_MMUTR_SHIFT	10
29
30#define CF_PAGE_VALID		(MMUTR_V << CF_PAGE_MMUTR_SHIFT)
31#define CF_PAGE_SHARED		(MMUTR_SG << CF_PAGE_MMUTR_SHIFT)
32
33/*
34 * Fake bits, not implemented in CF, will get masked out before
35 * hitting hardware.
36 */
37#define CF_PAGE_DIRTY		0x00000001
38#define CF_PAGE_ACCESSED	0x00001000
39
40#define _PAGE_CACHE040		0x020   /* 68040 cache mode, cachable, copyback */
41#define _PAGE_NOCACHE_S		0x040   /* 68040 no-cache mode, serialized */
42#define _PAGE_NOCACHE		0x060   /* 68040 cache mode, non-serialized */
43#define _PAGE_CACHE040W		0x000   /* 68040 cache mode, cachable, write-through */
44#define _DESCTYPE_MASK		0x003
45#define _CACHEMASK040		(~0x060)
46#define _PAGE_GLOBAL040		0x400   /* 68040 global bit, used for kva descs */
47
48/*
49 * Externally used page protection values.
50 */
51#define _PAGE_PRESENT	(CF_PAGE_VALID)
52#define _PAGE_ACCESSED	(CF_PAGE_ACCESSED)
53#define _PAGE_DIRTY	(CF_PAGE_DIRTY)
54#define _PAGE_READWRITE (CF_PAGE_READABLE \
55				| CF_PAGE_WRITABLE \
56				| CF_PAGE_SYSTEM \
57				| CF_PAGE_SHARED)
58
59/*
60 * Compound page protection values.
61 */
62#define PAGE_NONE	__pgprot(CF_PAGE_VALID \
63				 | CF_PAGE_ACCESSED)
64
65#define PAGE_SHARED     __pgprot(CF_PAGE_VALID \
66				 | CF_PAGE_ACCESSED \
67				 | CF_PAGE_SHARED)
68
69#define PAGE_INIT	__pgprot(CF_PAGE_VALID \
70				 | CF_PAGE_READABLE \
71				 | CF_PAGE_WRITABLE \
72				 | CF_PAGE_EXEC \
73				 | CF_PAGE_SYSTEM)
74
75#define PAGE_KERNEL	__pgprot(CF_PAGE_VALID \
76				 | CF_PAGE_ACCESSED \
77				 | CF_PAGE_READABLE \
78				 | CF_PAGE_WRITABLE \
79				 | CF_PAGE_EXEC \
80				 | CF_PAGE_SYSTEM \
81				 | CF_PAGE_SHARED)
82
83#define PAGE_COPY	__pgprot(CF_PAGE_VALID \
84				 | CF_PAGE_ACCESSED \
85				 | CF_PAGE_READABLE \
86				 | CF_PAGE_DIRTY)
87
88/*
89 * Page protections for initialising protection_map. See mm/mmap.c
90 * for use. In general, the bit positions are xwr, and P-items are
91 * private, the S-items are shared.
92 */
93#define __P000		PAGE_NONE
94#define __P001		__pgprot(CF_PAGE_VALID \
95				 | CF_PAGE_ACCESSED \
96				 | CF_PAGE_READABLE)
97#define __P010		__pgprot(CF_PAGE_VALID \
98				 | CF_PAGE_ACCESSED \
99				 | CF_PAGE_WRITABLE)
100#define __P011		__pgprot(CF_PAGE_VALID \
101				 | CF_PAGE_ACCESSED \
102				 | CF_PAGE_READABLE \
103				 | CF_PAGE_WRITABLE)
104#define __P100		__pgprot(CF_PAGE_VALID \
105				 | CF_PAGE_ACCESSED \
106				 | CF_PAGE_EXEC)
107#define __P101		__pgprot(CF_PAGE_VALID \
108				 | CF_PAGE_ACCESSED \
109				 | CF_PAGE_READABLE \
110				 | CF_PAGE_EXEC)
111#define __P110		__pgprot(CF_PAGE_VALID \
112				 | CF_PAGE_ACCESSED \
113				 | CF_PAGE_WRITABLE \
114				 | CF_PAGE_EXEC)
115#define __P111		__pgprot(CF_PAGE_VALID \
116				 | CF_PAGE_ACCESSED \
117				 | CF_PAGE_READABLE \
118				 | CF_PAGE_WRITABLE \
119				 | CF_PAGE_EXEC)
120
121#define __S000		PAGE_NONE
122#define __S001		__pgprot(CF_PAGE_VALID \
123				 | CF_PAGE_ACCESSED \
124				 | CF_PAGE_READABLE)
125#define __S010		PAGE_SHARED
126#define __S011		__pgprot(CF_PAGE_VALID \
127				 | CF_PAGE_ACCESSED \
128				 | CF_PAGE_SHARED \
129				 | CF_PAGE_READABLE)
130#define __S100		__pgprot(CF_PAGE_VALID \
131				 | CF_PAGE_ACCESSED \
132				 | CF_PAGE_EXEC)
133#define __S101		__pgprot(CF_PAGE_VALID \
134				 | CF_PAGE_ACCESSED \
135				 | CF_PAGE_READABLE \
136				 | CF_PAGE_EXEC)
137#define __S110		__pgprot(CF_PAGE_VALID \
138				 | CF_PAGE_ACCESSED \
139				 | CF_PAGE_SHARED \
140				 | CF_PAGE_EXEC)
141#define __S111		__pgprot(CF_PAGE_VALID \
142				 | CF_PAGE_ACCESSED \
143				 | CF_PAGE_SHARED \
144				 | CF_PAGE_READABLE \
145				 | CF_PAGE_EXEC)
146
147#define PTE_MASK	PAGE_MASK
148#define CF_PAGE_CHG_MASK (PTE_MASK | CF_PAGE_ACCESSED | CF_PAGE_DIRTY)
149
150#ifndef __ASSEMBLY__
151
152/*
153 * Conversion functions: convert a page and protection to a page entry,
154 * and a page entry and page directory to the page they refer to.
155 */
156#define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot))
157
158static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
159{
160	pte_val(pte) = (pte_val(pte) & CF_PAGE_CHG_MASK) | pgprot_val(newprot);
161	return pte;
162}
163
164#define pmd_set(pmdp, ptep) do {} while (0)
165
166static inline void pgd_set(pgd_t *pgdp, pmd_t *pmdp)
167{
168	pgd_val(*pgdp) = virt_to_phys(pmdp);
169}
170
171#define __pte_page(pte)	((unsigned long) (pte_val(pte) & PAGE_MASK))
172#define __pmd_page(pmd)	((unsigned long) (pmd_val(pmd)))
173
174static inline int pte_none(pte_t pte)
175{
176	return !pte_val(pte);
177}
178
179static inline int pte_present(pte_t pte)
180{
181	return pte_val(pte) & CF_PAGE_VALID;
182}
183
184static inline void pte_clear(struct mm_struct *mm, unsigned long addr,
185	pte_t *ptep)
186{
187	pte_val(*ptep) = 0;
188}
189
190#define pte_pagenr(pte)	((__pte_page(pte) - PAGE_OFFSET) >> PAGE_SHIFT)
191#define pte_page(pte)	virt_to_page(__pte_page(pte))
192
193static inline int pmd_none2(pmd_t *pmd) { return !pmd_val(*pmd); }
194#define pmd_none(pmd) pmd_none2(&(pmd))
195static inline int pmd_bad2(pmd_t *pmd) { return 0; }
196#define pmd_bad(pmd) pmd_bad2(&(pmd))
197#define pmd_present(pmd) (!pmd_none2(&(pmd)))
198static inline void pmd_clear(pmd_t *pmdp) { pmd_val(*pmdp) = 0; }
199
200static inline int pgd_none(pgd_t pgd) { return 0; }
201static inline int pgd_bad(pgd_t pgd) { return 0; }
202static inline int pgd_present(pgd_t pgd) { return 1; }
203static inline void pgd_clear(pgd_t *pgdp) {}
204
205#define pte_ERROR(e) \
206	printk(KERN_ERR "%s:%d: bad pte %08lx.\n",	\
207	__FILE__, __LINE__, pte_val(e))
208#define pmd_ERROR(e) \
209	printk(KERN_ERR "%s:%d: bad pmd %08lx.\n",	\
210	__FILE__, __LINE__, pmd_val(e))
211#define pgd_ERROR(e) \
212	printk(KERN_ERR "%s:%d: bad pgd %08lx.\n",	\
213	__FILE__, __LINE__, pgd_val(e))
214
215/*
216 * The following only work if pte_present() is true.
217 * Undefined behaviour if not...
218 * [we have the full set here even if they don't change from m68k]
219 */
220static inline int pte_read(pte_t pte)
221{
222	return pte_val(pte) & CF_PAGE_READABLE;
223}
224
225static inline int pte_write(pte_t pte)
226{
227	return pte_val(pte) & CF_PAGE_WRITABLE;
228}
229
230static inline int pte_exec(pte_t pte)
231{
232	return pte_val(pte) & CF_PAGE_EXEC;
233}
234
235static inline int pte_dirty(pte_t pte)
236{
237	return pte_val(pte) & CF_PAGE_DIRTY;
238}
239
240static inline int pte_young(pte_t pte)
241{
242	return pte_val(pte) & CF_PAGE_ACCESSED;
243}
244
245static inline int pte_special(pte_t pte)
246{
247	return 0;
248}
249
250static inline pte_t pte_wrprotect(pte_t pte)
251{
252	pte_val(pte) &= ~CF_PAGE_WRITABLE;
253	return pte;
254}
255
256static inline pte_t pte_rdprotect(pte_t pte)
257{
258	pte_val(pte) &= ~CF_PAGE_READABLE;
259	return pte;
260}
261
262static inline pte_t pte_exprotect(pte_t pte)
263{
264	pte_val(pte) &= ~CF_PAGE_EXEC;
265	return pte;
266}
267
268static inline pte_t pte_mkclean(pte_t pte)
269{
270	pte_val(pte) &= ~CF_PAGE_DIRTY;
271	return pte;
272}
273
274static inline pte_t pte_mkold(pte_t pte)
275{
276	pte_val(pte) &= ~CF_PAGE_ACCESSED;
277	return pte;
278}
279
280static inline pte_t pte_mkwrite(pte_t pte)
281{
282	pte_val(pte) |= CF_PAGE_WRITABLE;
283	return pte;
284}
285
286static inline pte_t pte_mkread(pte_t pte)
287{
288	pte_val(pte) |= CF_PAGE_READABLE;
289	return pte;
290}
291
292static inline pte_t pte_mkexec(pte_t pte)
293{
294	pte_val(pte) |= CF_PAGE_EXEC;
295	return pte;
296}
297
298static inline pte_t pte_mkdirty(pte_t pte)
299{
300	pte_val(pte) |= CF_PAGE_DIRTY;
301	return pte;
302}
303
304static inline pte_t pte_mkyoung(pte_t pte)
305{
306	pte_val(pte) |= CF_PAGE_ACCESSED;
307	return pte;
308}
309
310static inline pte_t pte_mknocache(pte_t pte)
311{
312	pte_val(pte) |= 0x80 | (pte_val(pte) & ~0x40);
313	return pte;
314}
315
316static inline pte_t pte_mkcache(pte_t pte)
317{
318	pte_val(pte) &= ~CF_PAGE_NOCACHE;
319	return pte;
320}
321
322static inline pte_t pte_mkspecial(pte_t pte)
323{
324	return pte;
325}
326
327#define swapper_pg_dir kernel_pg_dir
328extern pgd_t kernel_pg_dir[PTRS_PER_PGD];
329
330/*
331 * Find an entry in a pagetable directory.
332 */
333#define pgd_index(address)	((address) >> PGDIR_SHIFT)
334#define pgd_offset(mm, address)	((mm)->pgd + pgd_index(address))
335
336/*
337 * Find an entry in a kernel pagetable directory.
338 */
339#define pgd_offset_k(address)	pgd_offset(&init_mm, address)
340
341/*
342 * Find an entry in the second-level pagetable.
343 */
344static inline pmd_t *pmd_offset(pgd_t *pgd, unsigned long address)
345{
346	return (pmd_t *) pgd;
347}
348
349/*
350 * Find an entry in the third-level pagetable.
351 */
352#define __pte_offset(address)	((address >> PAGE_SHIFT) & (PTRS_PER_PTE - 1))
353#define pte_offset_kernel(dir, address) \
354	((pte_t *) __pmd_page(*(dir)) + __pte_offset(address))
355
356/*
357 * Disable caching for page at given kernel virtual address.
358 */
359static inline void nocache_page(void *vaddr)
360{
361	pgd_t *dir;
362	pmd_t *pmdp;
363	pte_t *ptep;
364	unsigned long addr = (unsigned long) vaddr;
365
366	dir = pgd_offset_k(addr);
367	pmdp = pmd_offset(dir, addr);
368	ptep = pte_offset_kernel(pmdp, addr);
369	*ptep = pte_mknocache(*ptep);
370}
371
372/*
373 * Enable caching for page at given kernel virtual address.
374 */
375static inline void cache_page(void *vaddr)
376{
377	pgd_t *dir;
378	pmd_t *pmdp;
379	pte_t *ptep;
380	unsigned long addr = (unsigned long) vaddr;
381
382	dir = pgd_offset_k(addr);
383	pmdp = pmd_offset(dir, addr);
384	ptep = pte_offset_kernel(pmdp, addr);
385	*ptep = pte_mkcache(*ptep);
386}
387
388/*
389 * Encode and de-code a swap entry (must be !pte_none(e) && !pte_present(e))
390 */
391#define __swp_type(x)		((x).val & 0xFF)
392#define __swp_offset(x)		((x).val >> 11)
393#define __swp_entry(typ, off)	((swp_entry_t) { (typ) | \
394					(off << 11) })
395#define __pte_to_swp_entry(pte)	((swp_entry_t) { pte_val(pte) })
396#define __swp_entry_to_pte(x)	(__pte((x).val))
397
398#define pmd_page(pmd)		(pfn_to_page(pmd_val(pmd) >> PAGE_SHIFT))
399
400#define pte_offset_map(pmdp, addr) ((pte_t *)__pmd_page(*pmdp) + \
401				       __pte_offset(addr))
402#define pte_unmap(pte)		((void) 0)
403#define pfn_pte(pfn, prot)	__pte(((pfn) << PAGE_SHIFT) | pgprot_val(prot))
404#define pte_pfn(pte)		(pte_val(pte) >> PAGE_SHIFT)
405
406#endif	/* !__ASSEMBLY__ */
407#endif	/* _MCF_PGTABLE_H */
408