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
27 /*
28 * Currently set to the minimum alignment of table pointers (256 bytes).
29 * The hardware only uses the low 4 bits for state:
30 *
31 * 3 - Used
32 * 2 - Write Protected
33 * 0,1 - Descriptor Type
34 *
35 * and has the rest of the bits reserved.
36 */
37 #define _TABLE_MASK (0xffffff00)
38
39 #define _PAGE_TABLE (_PAGE_SHORT)
40 #define _PAGE_CHG_MASK (PAGE_MASK | _PAGE_ACCESSED | _PAGE_DIRTY | _PAGE_NOCACHE)
41
42 #define _PAGE_PROTNONE 0x004
43
44 #ifndef __ASSEMBLY__
45
46 /* This is the cache mode to be used for pages containing page descriptors for
47 * processors >= '040. It is in pte_mknocache(), and the variable is defined
48 * and initialized in head.S */
49 extern int m68k_pgtable_cachemode;
50
51 /* This is the cache mode for normal pages, for supervisor access on
52 * processors >= '040. It is used in pte_mkcache(), and the variable is
53 * defined and initialized in head.S */
54
55 #if defined(CPU_M68060_ONLY) && defined(CONFIG_060_WRITETHROUGH)
56 #define m68k_supervisor_cachemode _PAGE_CACHE040W
57 #elif defined(CPU_M68040_OR_M68060_ONLY)
58 #define m68k_supervisor_cachemode _PAGE_CACHE040
59 #elif defined(CPU_M68020_OR_M68030_ONLY)
60 #define m68k_supervisor_cachemode 0
61 #else
62 extern int m68k_supervisor_cachemode;
63 #endif
64
65 #if defined(CPU_M68040_OR_M68060_ONLY)
66 #define mm_cachebits _PAGE_CACHE040
67 #elif defined(CPU_M68020_OR_M68030_ONLY)
68 #define mm_cachebits 0
69 #else
70 extern unsigned long mm_cachebits;
71 #endif
72
73 #define PAGE_NONE __pgprot(_PAGE_PROTNONE | _PAGE_ACCESSED | mm_cachebits)
74 #define PAGE_SHARED __pgprot(_PAGE_PRESENT | _PAGE_ACCESSED | mm_cachebits)
75 #define PAGE_COPY __pgprot(_PAGE_PRESENT | _PAGE_RONLY | _PAGE_ACCESSED | mm_cachebits)
76 #define PAGE_READONLY __pgprot(_PAGE_PRESENT | _PAGE_RONLY | _PAGE_ACCESSED | mm_cachebits)
77 #define PAGE_KERNEL __pgprot(_PAGE_PRESENT | _PAGE_DIRTY | _PAGE_ACCESSED | mm_cachebits)
78
79 /* Alternate definitions that are compile time constants, for
80 initializing protection_map. The cachebits are fixed later. */
81 #define PAGE_NONE_C __pgprot(_PAGE_PROTNONE | _PAGE_ACCESSED)
82 #define PAGE_SHARED_C __pgprot(_PAGE_PRESENT | _PAGE_ACCESSED)
83 #define PAGE_COPY_C __pgprot(_PAGE_PRESENT | _PAGE_RONLY | _PAGE_ACCESSED)
84 #define PAGE_READONLY_C __pgprot(_PAGE_PRESENT | _PAGE_RONLY | _PAGE_ACCESSED)
85
86 /*
87 * The m68k can't do page protection for execute, and considers that the same are read.
88 * Also, write permissions imply read permissions. This is the closest we can get..
89 */
90 #define __P000 PAGE_NONE_C
91 #define __P001 PAGE_READONLY_C
92 #define __P010 PAGE_COPY_C
93 #define __P011 PAGE_COPY_C
94 #define __P100 PAGE_READONLY_C
95 #define __P101 PAGE_READONLY_C
96 #define __P110 PAGE_COPY_C
97 #define __P111 PAGE_COPY_C
98
99 #define __S000 PAGE_NONE_C
100 #define __S001 PAGE_READONLY_C
101 #define __S010 PAGE_SHARED_C
102 #define __S011 PAGE_SHARED_C
103 #define __S100 PAGE_READONLY_C
104 #define __S101 PAGE_READONLY_C
105 #define __S110 PAGE_SHARED_C
106 #define __S111 PAGE_SHARED_C
107
108 #define pmd_pgtable(pmd) ((pgtable_t)pmd_page_vaddr(pmd))
109
110 /*
111 * Conversion functions: convert a page and protection to a page entry,
112 * and a page entry and page directory to the page they refer to.
113 */
114 #define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot))
115
pte_modify(pte_t pte,pgprot_t newprot)116 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
117 {
118 pte_val(pte) = (pte_val(pte) & _PAGE_CHG_MASK) | pgprot_val(newprot);
119 return pte;
120 }
121
pmd_set(pmd_t * pmdp,pte_t * ptep)122 static inline void pmd_set(pmd_t *pmdp, pte_t *ptep)
123 {
124 pmd_val(*pmdp) = virt_to_phys(ptep) | _PAGE_TABLE | _PAGE_ACCESSED;
125 }
126
pud_set(pud_t * pudp,pmd_t * pmdp)127 static inline void pud_set(pud_t *pudp, pmd_t *pmdp)
128 {
129 pud_val(*pudp) = _PAGE_TABLE | _PAGE_ACCESSED | __pa(pmdp);
130 }
131
132 #define __pte_page(pte) ((unsigned long)__va(pte_val(pte) & PAGE_MASK))
133 #define pmd_page_vaddr(pmd) ((unsigned long)__va(pmd_val(pmd) & _TABLE_MASK))
134 #define pud_pgtable(pud) ((pmd_t *)__va(pud_val(pud) & _TABLE_MASK))
135
136
137 #define pte_none(pte) (!pte_val(pte))
138 #define pte_present(pte) (pte_val(pte) & (_PAGE_PRESENT | _PAGE_PROTNONE))
139 #define pte_clear(mm,addr,ptep) ({ pte_val(*(ptep)) = 0; })
140
141 #define pte_page(pte) virt_to_page(__va(pte_val(pte)))
142 #define pte_pfn(pte) (pte_val(pte) >> PAGE_SHIFT)
143 #define pfn_pte(pfn, prot) __pte(((pfn) << PAGE_SHIFT) | pgprot_val(prot))
144
145 #define pmd_none(pmd) (!pmd_val(pmd))
146 #define pmd_bad(pmd) ((pmd_val(pmd) & _DESCTYPE_MASK) != _PAGE_TABLE)
147 #define pmd_present(pmd) (pmd_val(pmd) & _PAGE_TABLE)
148 #define pmd_clear(pmdp) ({ pmd_val(*pmdp) = 0; })
149
150 /*
151 * m68k does not have huge pages (020/030 actually could), but generic code
152 * expects pmd_page() to exists, only to then DCE it all. Provide a dummy to
153 * make the compiler happy.
154 */
155 #define pmd_page(pmd) NULL
156
157
158 #define pud_none(pud) (!pud_val(pud))
159 #define pud_bad(pud) ((pud_val(pud) & _DESCTYPE_MASK) != _PAGE_TABLE)
160 #define pud_present(pud) (pud_val(pud) & _PAGE_TABLE)
161 #define pud_clear(pudp) ({ pud_val(*pudp) = 0; })
162 #define pud_page(pud) (mem_map + ((unsigned long)(__va(pud_val(pud)) - PAGE_OFFSET) >> PAGE_SHIFT))
163
164 #define pte_ERROR(e) \
165 printk("%s:%d: bad pte %08lx.\n", __FILE__, __LINE__, pte_val(e))
166 #define pmd_ERROR(e) \
167 printk("%s:%d: bad pmd %08lx.\n", __FILE__, __LINE__, pmd_val(e))
168 #define pgd_ERROR(e) \
169 printk("%s:%d: bad pgd %08lx.\n", __FILE__, __LINE__, pgd_val(e))
170
171
172 /*
173 * The following only work if pte_present() is true.
174 * Undefined behaviour if not..
175 */
pte_write(pte_t pte)176 static inline int pte_write(pte_t pte) { return !(pte_val(pte) & _PAGE_RONLY); }
pte_dirty(pte_t pte)177 static inline int pte_dirty(pte_t pte) { return pte_val(pte) & _PAGE_DIRTY; }
pte_young(pte_t pte)178 static inline int pte_young(pte_t pte) { return pte_val(pte) & _PAGE_ACCESSED; }
179
pte_wrprotect(pte_t pte)180 static inline pte_t pte_wrprotect(pte_t pte) { pte_val(pte) |= _PAGE_RONLY; return pte; }
pte_mkclean(pte_t pte)181 static inline pte_t pte_mkclean(pte_t pte) { pte_val(pte) &= ~_PAGE_DIRTY; return pte; }
pte_mkold(pte_t pte)182 static inline pte_t pte_mkold(pte_t pte) { pte_val(pte) &= ~_PAGE_ACCESSED; return pte; }
pte_mkwrite(pte_t pte)183 static inline pte_t pte_mkwrite(pte_t pte) { pte_val(pte) &= ~_PAGE_RONLY; return pte; }
pte_mkdirty(pte_t pte)184 static inline pte_t pte_mkdirty(pte_t pte) { pte_val(pte) |= _PAGE_DIRTY; return pte; }
pte_mkyoung(pte_t pte)185 static inline pte_t pte_mkyoung(pte_t pte) { pte_val(pte) |= _PAGE_ACCESSED; return pte; }
pte_mknocache(pte_t pte)186 static inline pte_t pte_mknocache(pte_t pte)
187 {
188 pte_val(pte) = (pte_val(pte) & _CACHEMASK040) | m68k_pgtable_cachemode;
189 return pte;
190 }
pte_mkcache(pte_t pte)191 static inline pte_t pte_mkcache(pte_t pte)
192 {
193 pte_val(pte) = (pte_val(pte) & _CACHEMASK040) | m68k_supervisor_cachemode;
194 return pte;
195 }
196
197 #define swapper_pg_dir kernel_pg_dir
198 extern pgd_t kernel_pg_dir[128];
199
200 /* Encode and de-code a swap entry (must be !pte_none(e) && !pte_present(e)) */
201 #define __swp_type(x) (((x).val >> 4) & 0xff)
202 #define __swp_offset(x) ((x).val >> 12)
203 #define __swp_entry(type, offset) ((swp_entry_t) { ((type) << 4) | ((offset) << 12) })
204 #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) })
205 #define __swp_entry_to_pte(x) ((pte_t) { (x).val })
206
207 #endif /* !__ASSEMBLY__ */
208 #endif /* _MOTOROLA_PGTABLE_H */
209