mcf_pgtable.h

  1/* SPDX-License-Identifier: GPL-2.0 */
  2#ifndef _MCF_PGTABLE_H
  3#define _MCF_PGTABLE_H
  4
  5#include <asm/mcfmmu.h>
  6#include <asm/page.h>
  7
  8/*
  9 * MMUDR bits, in proper place. We write these directly into the MMUDR
 10 * after masking from the pte.
 11 */
 12#define CF_PAGE_LOCKED		MMUDR_LK	/* 0x00000002 */
 13#define CF_PAGE_EXEC		MMUDR_X		/* 0x00000004 */
 14#define CF_PAGE_WRITABLE	MMUDR_W		/* 0x00000008 */
 15#define CF_PAGE_READABLE	MMUDR_R		/* 0x00000010 */
 16#define CF_PAGE_SYSTEM		MMUDR_SP	/* 0x00000020 */
 17#define CF_PAGE_COPYBACK	MMUDR_CM_CCB	/* 0x00000040 */
 18#define CF_PAGE_NOCACHE		MMUDR_CM_NCP	/* 0x00000080 */
 19
 20#define CF_CACHEMASK		(~MMUDR_CM_CCB)
 21#define CF_PAGE_MMUDR_MASK	0x000000fe
 22
 23#define _PAGE_NOCACHE030	CF_PAGE_NOCACHE
 24
 25/*
 26 * MMUTR bits, need shifting down.
 27 */
 28#define CF_PAGE_MMUTR_MASK	0x00000c00
 29#define CF_PAGE_MMUTR_SHIFT	10
 30
 31#define CF_PAGE_VALID		(MMUTR_V << CF_PAGE_MMUTR_SHIFT)
 32#define CF_PAGE_SHARED		(MMUTR_SG << CF_PAGE_MMUTR_SHIFT)
 33
 34/*
 35 * Fake bits, not implemented in CF, will get masked out before
 36 * hitting hardware.
 37 */
 38#define CF_PAGE_DIRTY		0x00000001
 39#define CF_PAGE_ACCESSED	0x00001000
 40
 41#define _PAGE_CACHE040		0x020   /* 68040 cache mode, cachable, copyback */
 42#define _PAGE_NOCACHE_S		0x040   /* 68040 no-cache mode, serialized */
 43#define _PAGE_NOCACHE		0x060   /* 68040 cache mode, non-serialized */
 44#define _PAGE_CACHE040W		0x000   /* 68040 cache mode, cachable, write-through */
 45#define _DESCTYPE_MASK		0x003
 46#define _CACHEMASK040		(~0x060)
 47#define _PAGE_GLOBAL040		0x400   /* 68040 global bit, used for kva descs */
 48
 49/* We borrow bit 7 to store the exclusive marker in swap PTEs. */
 50#define _PAGE_SWP_EXCLUSIVE	CF_PAGE_NOCACHE
 51
 52/*
 53 * Externally used page protection values.
 54 */
 55#define _PAGE_PRESENT	(CF_PAGE_VALID)
 56#define _PAGE_ACCESSED	(CF_PAGE_ACCESSED)
 57#define _PAGE_DIRTY	(CF_PAGE_DIRTY)
 58#define _PAGE_READWRITE (CF_PAGE_READABLE \
 59				| CF_PAGE_WRITABLE \
 60				| CF_PAGE_SYSTEM \
 61				| CF_PAGE_SHARED)
 62
 63/*
 64 * Compound page protection values.
 65 */
 66#define PAGE_NONE	__pgprot(CF_PAGE_VALID \
 67				 | CF_PAGE_ACCESSED)
 68
 69#define PAGE_SHARED     __pgprot(CF_PAGE_VALID \
 70				 | CF_PAGE_ACCESSED \
 71				 | CF_PAGE_SHARED)
 72
 73#define PAGE_INIT	__pgprot(CF_PAGE_VALID \
 74				 | CF_PAGE_READABLE \
 75				 | CF_PAGE_WRITABLE \
 76				 | CF_PAGE_EXEC \
 77				 | CF_PAGE_SYSTEM)
 78
 79#define PAGE_KERNEL	__pgprot(CF_PAGE_VALID \
 80				 | CF_PAGE_ACCESSED \
 81				 | CF_PAGE_READABLE \
 82				 | CF_PAGE_WRITABLE \
 83				 | CF_PAGE_EXEC \
 84				 | CF_PAGE_SYSTEM \
 85				 | CF_PAGE_SHARED)
 86
 87#define PAGE_COPY	__pgprot(CF_PAGE_VALID \
 88				 | CF_PAGE_ACCESSED \
 89				 | CF_PAGE_READABLE \
 90				 | CF_PAGE_DIRTY)
 91
 92#define PTE_MASK	PAGE_MASK
 93#define CF_PAGE_CHG_MASK (PTE_MASK | CF_PAGE_ACCESSED | CF_PAGE_DIRTY)
 94
 95#ifndef __ASSEMBLER__
 96
 97#define pmd_pgtable(pmd) pfn_to_virt(pmd_val(pmd) >> PAGE_SHIFT)
 98
 99static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
100{
101	pte_val(pte) = (pte_val(pte) & CF_PAGE_CHG_MASK) | pgprot_val(newprot);
102	return pte;
103}
104
105#define pmd_set(pmdp, ptep) do {} while (0)
106
107static inline void pgd_set(pgd_t *pgdp, pmd_t *pmdp)
108{
109	pgd_val(*pgdp) = virt_to_phys(pmdp);
110}
111
112#define __pte_page(pte)	((void *) (pte_val(pte) & PAGE_MASK))
113#define pmd_page_vaddr(pmd)	((unsigned long) (pmd_val(pmd)))
114
115static inline int pte_none(pte_t pte)
116{
117	return !pte_val(pte);
118}
119
120static inline int pte_present(pte_t pte)
121{
122	return pte_val(pte) & CF_PAGE_VALID;
123}
124
125static inline void pte_clear(struct mm_struct *mm, unsigned long addr,
126	pte_t *ptep)
127{
128	pte_val(*ptep) = 0;
129}
130
131#define pte_page(pte)	virt_to_page(__pte_page(pte))
132
133static inline int pmd_none2(pmd_t *pmd) { return !pmd_val(*pmd); }
134#define pmd_none(pmd) pmd_none2(&(pmd))
135static inline int pmd_bad2(pmd_t *pmd) { return 0; }
136#define pmd_bad(pmd) pmd_bad2(&(pmd))
137#define pmd_present(pmd) (!pmd_none2(&(pmd)))
138static inline void pmd_clear(pmd_t *pmdp) { pmd_val(*pmdp) = 0; }
139
140#define pte_ERROR(e) \
141	printk(KERN_ERR "%s:%d: bad pte %08lx.\n",	\
142	__FILE__, __LINE__, pte_val(e))
143#define pgd_ERROR(e) \
144	printk(KERN_ERR "%s:%d: bad pgd %08lx.\n",	\
145	__FILE__, __LINE__, pgd_val(e))
146
147/*
148 * The following only work if pte_present() is true.
149 * Undefined behaviour if not...
150 * [we have the full set here even if they don't change from m68k]
151 */
152static inline int pte_read(pte_t pte)
153{
154	return pte_val(pte) & CF_PAGE_READABLE;
155}
156
157static inline int pte_write(pte_t pte)
158{
159	return pte_val(pte) & CF_PAGE_WRITABLE;
160}
161
162static inline int pte_exec(pte_t pte)
163{
164	return pte_val(pte) & CF_PAGE_EXEC;
165}
166
167static inline int pte_dirty(pte_t pte)
168{
169	return pte_val(pte) & CF_PAGE_DIRTY;
170}
171
172static inline int pte_young(pte_t pte)
173{
174	return pte_val(pte) & CF_PAGE_ACCESSED;
175}
176
177static inline pte_t pte_wrprotect(pte_t pte)
178{
179	pte_val(pte) &= ~CF_PAGE_WRITABLE;
180	return pte;
181}
182
183static inline pte_t pte_rdprotect(pte_t pte)
184{
185	pte_val(pte) &= ~CF_PAGE_READABLE;
186	return pte;
187}
188
189static inline pte_t pte_exprotect(pte_t pte)
190{
191	pte_val(pte) &= ~CF_PAGE_EXEC;
192	return pte;
193}
194
195static inline pte_t pte_mkclean(pte_t pte)
196{
197	pte_val(pte) &= ~CF_PAGE_DIRTY;
198	return pte;
199}
200
201static inline pte_t pte_mkold(pte_t pte)
202{
203	pte_val(pte) &= ~CF_PAGE_ACCESSED;
204	return pte;
205}
206
207static inline pte_t pte_mkwrite_novma(pte_t pte)
208{
209	pte_val(pte) |= CF_PAGE_WRITABLE;
210	return pte;
211}
212
213static inline pte_t pte_mkread(pte_t pte)
214{
215	pte_val(pte) |= CF_PAGE_READABLE;
216	return pte;
217}
218
219static inline pte_t pte_mkexec(pte_t pte)
220{
221	pte_val(pte) |= CF_PAGE_EXEC;
222	return pte;
223}
224
225static inline pte_t pte_mkdirty(pte_t pte)
226{
227	pte_val(pte) |= CF_PAGE_DIRTY;
228	return pte;
229}
230
231static inline pte_t pte_mkyoung(pte_t pte)
232{
233	pte_val(pte) |= CF_PAGE_ACCESSED;
234	return pte;
235}
236
237static inline pte_t pte_mknocache(pte_t pte)
238{
239	pte_val(pte) |= 0x80 | (pte_val(pte) & ~0x40);
240	return pte;
241}
242
243static inline pte_t pte_mkcache(pte_t pte)
244{
245	pte_val(pte) &= ~CF_PAGE_NOCACHE;
246	return pte;
247}
248
249#define swapper_pg_dir kernel_pg_dir
250extern pgd_t kernel_pg_dir[PTRS_PER_PGD];
251
252/*
253 * Encode/decode swap entries and swap PTEs. Swap PTEs are all PTEs that
254 * are !pte_none() && !pte_present().
255 *
256 * Format of swap PTEs:
257 *
258 *   3 3 2 2 2 2 2 2 2 2 2 2 1 1 1 1 1 1 1 1 1 1
259 *   1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0
260 *   <------------------ offset -------------> 0 0 0 E <-- type --->
261 *
262 *   E is the exclusive marker that is not stored in swap entries.
263 */
264#define __swp_type(x)		((x).val & 0x7f)
265#define __swp_offset(x)		((x).val >> 11)
266#define __swp_entry(typ, off)	((swp_entry_t) { ((typ) & 0x7f) | \
267					(off << 11) })
268#define __pte_to_swp_entry(pte)	((swp_entry_t) { pte_val(pte) })
269#define __swp_entry_to_pte(x)	(__pte((x).val))
270
271static inline bool pte_swp_exclusive(pte_t pte)
272{
273	return pte_val(pte) & _PAGE_SWP_EXCLUSIVE;
274}
275
276static inline pte_t pte_swp_mkexclusive(pte_t pte)
277{
278	pte_val(pte) |= _PAGE_SWP_EXCLUSIVE;
279	return pte;
280}
281
282static inline pte_t pte_swp_clear_exclusive(pte_t pte)
283{
284	pte_val(pte) &= ~_PAGE_SWP_EXCLUSIVE;
285	return pte;
286}
287
288#define PFN_PTE_SHIFT		PAGE_SHIFT
289#define pmd_pfn(pmd)		(pmd_val(pmd) >> PAGE_SHIFT)
290#define pmd_page(pmd)		(pfn_to_page(pmd_val(pmd) >> PAGE_SHIFT))
291
292#define pfn_pte(pfn, prot)	__pte(((pfn) << PAGE_SHIFT) | pgprot_val(prot))
293#define pte_pfn(pte)		(pte_val(pte) >> PAGE_SHIFT)
294
295#endif	/* !__ASSEMBLER__ */
296#endif	/* _MCF_PGTABLE_H */