1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _MOTOROLA_PGTABLE_H
3 #define _MOTOROLA_PGTABLE_H
4 
5 
6 /*
7  * Definitions for MMU descriptors
8  */
9 #define _PAGE_PRESENT	0x001
10 #define _PAGE_SHORT	0x002
11 #define _PAGE_RONLY	0x004
12 #define _PAGE_READWRITE	0x000
13 #define _PAGE_ACCESSED	0x008
14 #define _PAGE_DIRTY	0x010
15 #define _PAGE_SUPER	0x080	/* 68040 supervisor only */
16 #define _PAGE_GLOBAL040	0x400	/* 68040 global bit, used for kva descs */
17 #define _PAGE_NOCACHE030 0x040	/* 68030 no-cache mode */
18 #define _PAGE_NOCACHE	0x060	/* 68040 cache mode, non-serialized */
19 #define _PAGE_NOCACHE_S	0x040	/* 68040 no-cache mode, serialized */
20 #define _PAGE_CACHE040	0x020	/* 68040 cache mode, cachable, copyback */
21 #define _PAGE_CACHE040W	0x000	/* 68040 cache mode, cachable, write-through */
22 
23 #define _DESCTYPE_MASK	0x003
24 
25 #define _CACHEMASK040	(~0x060)
26 #define _TABLE_MASK	(0xfffffe00)
27 
28 #define _PAGE_TABLE	(_PAGE_SHORT)
29 #define _PAGE_CHG_MASK  (PAGE_MASK | _PAGE_ACCESSED | _PAGE_DIRTY | _PAGE_NOCACHE)
30 
31 #define _PAGE_PROTNONE	0x004
32 
33 #ifndef __ASSEMBLY__
34 
35 /* This is the cache mode to be used for pages containing page descriptors for
36  * processors >= '040. It is in pte_mknocache(), and the variable is defined
37  * and initialized in head.S */
38 extern int m68k_pgtable_cachemode;
39 
40 /* This is the cache mode for normal pages, for supervisor access on
41  * processors >= '040. It is used in pte_mkcache(), and the variable is
42  * defined and initialized in head.S */
43 
44 #if defined(CPU_M68060_ONLY) && defined(CONFIG_060_WRITETHROUGH)
45 #define m68k_supervisor_cachemode _PAGE_CACHE040W
46 #elif defined(CPU_M68040_OR_M68060_ONLY)
47 #define m68k_supervisor_cachemode _PAGE_CACHE040
48 #elif defined(CPU_M68020_OR_M68030_ONLY)
49 #define m68k_supervisor_cachemode 0
50 #else
51 extern int m68k_supervisor_cachemode;
52 #endif
53 
54 #if defined(CPU_M68040_OR_M68060_ONLY)
55 #define mm_cachebits _PAGE_CACHE040
56 #elif defined(CPU_M68020_OR_M68030_ONLY)
57 #define mm_cachebits 0
58 #else
59 extern unsigned long mm_cachebits;
60 #endif
61 
62 #define PAGE_NONE	__pgprot(_PAGE_PROTNONE | _PAGE_ACCESSED | mm_cachebits)
63 #define PAGE_SHARED	__pgprot(_PAGE_PRESENT | _PAGE_ACCESSED | mm_cachebits)
64 #define PAGE_COPY	__pgprot(_PAGE_PRESENT | _PAGE_RONLY | _PAGE_ACCESSED | mm_cachebits)
65 #define PAGE_READONLY	__pgprot(_PAGE_PRESENT | _PAGE_RONLY | _PAGE_ACCESSED | mm_cachebits)
66 #define PAGE_KERNEL	__pgprot(_PAGE_PRESENT | _PAGE_DIRTY | _PAGE_ACCESSED | mm_cachebits)
67 
68 /* Alternate definitions that are compile time constants, for
69    initializing protection_map.  The cachebits are fixed later.  */
70 #define PAGE_NONE_C	__pgprot(_PAGE_PROTNONE | _PAGE_ACCESSED)
71 #define PAGE_SHARED_C	__pgprot(_PAGE_PRESENT | _PAGE_ACCESSED)
72 #define PAGE_COPY_C	__pgprot(_PAGE_PRESENT | _PAGE_RONLY | _PAGE_ACCESSED)
73 #define PAGE_READONLY_C	__pgprot(_PAGE_PRESENT | _PAGE_RONLY | _PAGE_ACCESSED)
74 
75 /*
76  * The m68k can't do page protection for execute, and considers that the same are read.
77  * Also, write permissions imply read permissions. This is the closest we can get..
78  */
79 #define __P000	PAGE_NONE_C
80 #define __P001	PAGE_READONLY_C
81 #define __P010	PAGE_COPY_C
82 #define __P011	PAGE_COPY_C
83 #define __P100	PAGE_READONLY_C
84 #define __P101	PAGE_READONLY_C
85 #define __P110	PAGE_COPY_C
86 #define __P111	PAGE_COPY_C
87 
88 #define __S000	PAGE_NONE_C
89 #define __S001	PAGE_READONLY_C
90 #define __S010	PAGE_SHARED_C
91 #define __S011	PAGE_SHARED_C
92 #define __S100	PAGE_READONLY_C
93 #define __S101	PAGE_READONLY_C
94 #define __S110	PAGE_SHARED_C
95 #define __S111	PAGE_SHARED_C
96 
97 /*
98  * Conversion functions: convert a page and protection to a page entry,
99  * and a page entry and page directory to the page they refer to.
100  */
101 #define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot))
102 
103 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
104 {
105 	pte_val(pte) = (pte_val(pte) & _PAGE_CHG_MASK) | pgprot_val(newprot);
106 	return pte;
107 }
108 
109 static inline void pmd_set(pmd_t *pmdp, pte_t *ptep)
110 {
111 	unsigned long ptbl = virt_to_phys(ptep) | _PAGE_TABLE | _PAGE_ACCESSED;
112 	unsigned long *ptr = pmdp->pmd;
113 	short i = 16;
114 	while (--i >= 0) {
115 		*ptr++ = ptbl;
116 		ptbl += (sizeof(pte_t)*PTRS_PER_PTE/16);
117 	}
118 }
119 
120 static inline void pgd_set(pgd_t *pgdp, pmd_t *pmdp)
121 {
122 	pgd_val(*pgdp) = _PAGE_TABLE | _PAGE_ACCESSED | __pa(pmdp);
123 }
124 
125 #define __pte_page(pte) ((unsigned long)__va(pte_val(pte) & PAGE_MASK))
126 #define __pmd_page(pmd) ((unsigned long)__va(pmd_val(pmd) & _TABLE_MASK))
127 #define __pgd_page(pgd) ((unsigned long)__va(pgd_val(pgd) & _TABLE_MASK))
128 
129 
130 #define pte_none(pte)		(!pte_val(pte))
131 #define pte_present(pte)	(pte_val(pte) & (_PAGE_PRESENT | _PAGE_PROTNONE))
132 #define pte_clear(mm,addr,ptep)		({ pte_val(*(ptep)) = 0; })
133 
134 #define pte_page(pte)		virt_to_page(__va(pte_val(pte)))
135 #define pte_pfn(pte)		(pte_val(pte) >> PAGE_SHIFT)
136 #define pfn_pte(pfn, prot)	__pte(((pfn) << PAGE_SHIFT) | pgprot_val(prot))
137 
138 #define pmd_none(pmd)		(!pmd_val(pmd))
139 #define pmd_bad(pmd)		((pmd_val(pmd) & _DESCTYPE_MASK) != _PAGE_TABLE)
140 #define pmd_present(pmd)	(pmd_val(pmd) & _PAGE_TABLE)
141 #define pmd_clear(pmdp) ({			\
142 	unsigned long *__ptr = pmdp->pmd;	\
143 	short __i = 16;				\
144 	while (--__i >= 0)			\
145 		*__ptr++ = 0;			\
146 })
147 #define pmd_page(pmd)		virt_to_page(__va(pmd_val(pmd)))
148 
149 
150 #define pgd_none(pgd)		(!pgd_val(pgd))
151 #define pgd_bad(pgd)		((pgd_val(pgd) & _DESCTYPE_MASK) != _PAGE_TABLE)
152 #define pgd_present(pgd)	(pgd_val(pgd) & _PAGE_TABLE)
153 #define pgd_clear(pgdp)		({ pgd_val(*pgdp) = 0; })
154 #define pgd_page(pgd)		(mem_map + ((unsigned long)(__va(pgd_val(pgd)) - PAGE_OFFSET) >> PAGE_SHIFT))
155 
156 #define pte_ERROR(e) \
157 	printk("%s:%d: bad pte %08lx.\n", __FILE__, __LINE__, pte_val(e))
158 #define pmd_ERROR(e) \
159 	printk("%s:%d: bad pmd %08lx.\n", __FILE__, __LINE__, pmd_val(e))
160 #define pgd_ERROR(e) \
161 	printk("%s:%d: bad pgd %08lx.\n", __FILE__, __LINE__, pgd_val(e))
162 
163 
164 /*
165  * The following only work if pte_present() is true.
166  * Undefined behaviour if not..
167  */
168 static inline int pte_write(pte_t pte)		{ return !(pte_val(pte) & _PAGE_RONLY); }
169 static inline int pte_dirty(pte_t pte)		{ return pte_val(pte) & _PAGE_DIRTY; }
170 static inline int pte_young(pte_t pte)		{ return pte_val(pte) & _PAGE_ACCESSED; }
171 static inline int pte_special(pte_t pte)	{ return 0; }
172 
173 static inline pte_t pte_wrprotect(pte_t pte)	{ pte_val(pte) |= _PAGE_RONLY; return pte; }
174 static inline pte_t pte_mkclean(pte_t pte)	{ pte_val(pte) &= ~_PAGE_DIRTY; return pte; }
175 static inline pte_t pte_mkold(pte_t pte)	{ pte_val(pte) &= ~_PAGE_ACCESSED; return pte; }
176 static inline pte_t pte_mkwrite(pte_t pte)	{ pte_val(pte) &= ~_PAGE_RONLY; return pte; }
177 static inline pte_t pte_mkdirty(pte_t pte)	{ pte_val(pte) |= _PAGE_DIRTY; return pte; }
178 static inline pte_t pte_mkyoung(pte_t pte)	{ pte_val(pte) |= _PAGE_ACCESSED; return pte; }
179 static inline pte_t pte_mknocache(pte_t pte)
180 {
181 	pte_val(pte) = (pte_val(pte) & _CACHEMASK040) | m68k_pgtable_cachemode;
182 	return pte;
183 }
184 static inline pte_t pte_mkcache(pte_t pte)
185 {
186 	pte_val(pte) = (pte_val(pte) & _CACHEMASK040) | m68k_supervisor_cachemode;
187 	return pte;
188 }
189 static inline pte_t pte_mkspecial(pte_t pte)	{ return pte; }
190 
191 #define PAGE_DIR_OFFSET(tsk,address) pgd_offset((tsk),(address))
192 
193 #define pgd_index(address)     ((address) >> PGDIR_SHIFT)
194 
195 /* to find an entry in a page-table-directory */
196 static inline pgd_t *pgd_offset(const struct mm_struct *mm,
197 				unsigned long address)
198 {
199 	return mm->pgd + pgd_index(address);
200 }
201 
202 #define swapper_pg_dir kernel_pg_dir
203 extern pgd_t kernel_pg_dir[128];
204 
205 static inline pgd_t *pgd_offset_k(unsigned long address)
206 {
207 	return kernel_pg_dir + (address >> PGDIR_SHIFT);
208 }
209 
210 
211 /* Find an entry in the second-level page table.. */
212 static inline pmd_t *pmd_offset(pgd_t *dir, unsigned long address)
213 {
214 	return (pmd_t *)__pgd_page(*dir) + ((address >> PMD_SHIFT) & (PTRS_PER_PMD-1));
215 }
216 
217 /* Find an entry in the third-level page table.. */
218 static inline pte_t *pte_offset_kernel(pmd_t *pmdp, unsigned long address)
219 {
220 	return (pte_t *)__pmd_page(*pmdp) + ((address >> PAGE_SHIFT) & (PTRS_PER_PTE - 1));
221 }
222 
223 #define pte_offset_map(pmdp,address) ((pte_t *)__pmd_page(*pmdp) + (((address) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1)))
224 #define pte_unmap(pte)		((void)0)
225 
226 /*
227  * Allocate and free page tables. The xxx_kernel() versions are
228  * used to allocate a kernel page table - this turns on ASN bits
229  * if any.
230  */
231 
232 /* Prior to calling these routines, the page should have been flushed
233  * from both the cache and ATC, or the CPU might not notice that the
234  * cache setting for the page has been changed. -jskov
235  */
236 static inline void nocache_page(void *vaddr)
237 {
238 	unsigned long addr = (unsigned long)vaddr;
239 
240 	if (CPU_IS_040_OR_060) {
241 		pgd_t *dir;
242 		pmd_t *pmdp;
243 		pte_t *ptep;
244 
245 		dir = pgd_offset_k(addr);
246 		pmdp = pmd_offset(dir, addr);
247 		ptep = pte_offset_kernel(pmdp, addr);
248 		*ptep = pte_mknocache(*ptep);
249 	}
250 }
251 
252 static inline void cache_page(void *vaddr)
253 {
254 	unsigned long addr = (unsigned long)vaddr;
255 
256 	if (CPU_IS_040_OR_060) {
257 		pgd_t *dir;
258 		pmd_t *pmdp;
259 		pte_t *ptep;
260 
261 		dir = pgd_offset_k(addr);
262 		pmdp = pmd_offset(dir, addr);
263 		ptep = pte_offset_kernel(pmdp, addr);
264 		*ptep = pte_mkcache(*ptep);
265 	}
266 }
267 
268 /* Encode and de-code a swap entry (must be !pte_none(e) && !pte_present(e)) */
269 #define __swp_type(x)		(((x).val >> 4) & 0xff)
270 #define __swp_offset(x)		((x).val >> 12)
271 #define __swp_entry(type, offset) ((swp_entry_t) { ((type) << 4) | ((offset) << 12) })
272 #define __pte_to_swp_entry(pte)	((swp_entry_t) { pte_val(pte) })
273 #define __swp_entry_to_pte(x)	((pte_t) { (x).val })
274 
275 #endif	/* !__ASSEMBLY__ */
276 #endif /* _MOTOROLA_PGTABLE_H */
277