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 
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 
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 
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 #define pmd_pfn(pmd)		((pmd_val(pmd) & _TABLE_MASK) >> PAGE_SHIFT)
151 /*
152  * m68k does not have huge pages (020/030 actually could), but generic code
153  * expects pmd_page() to exists, only to then DCE it all. Provide a dummy to
154  * make the compiler happy.
155  */
156 #define pmd_page(pmd)		NULL
157 
158 
159 #define pud_none(pud)		(!pud_val(pud))
160 #define pud_bad(pud)		((pud_val(pud) & _DESCTYPE_MASK) != _PAGE_TABLE)
161 #define pud_present(pud)	(pud_val(pud) & _PAGE_TABLE)
162 #define pud_clear(pudp)		({ pud_val(*pudp) = 0; })
163 #define pud_page(pud)		(mem_map + ((unsigned long)(__va(pud_val(pud)) - PAGE_OFFSET) >> PAGE_SHIFT))
164 
165 #define pte_ERROR(e) \
166 	printk("%s:%d: bad pte %08lx.\n", __FILE__, __LINE__, pte_val(e))
167 #define pmd_ERROR(e) \
168 	printk("%s:%d: bad pmd %08lx.\n", __FILE__, __LINE__, pmd_val(e))
169 #define pgd_ERROR(e) \
170 	printk("%s:%d: bad pgd %08lx.\n", __FILE__, __LINE__, pgd_val(e))
171 
172 
173 /*
174  * The following only work if pte_present() is true.
175  * Undefined behaviour if not..
176  */
177 static inline int pte_write(pte_t pte)		{ return !(pte_val(pte) & _PAGE_RONLY); }
178 static inline int pte_dirty(pte_t pte)		{ return pte_val(pte) & _PAGE_DIRTY; }
179 static inline int pte_young(pte_t pte)		{ return pte_val(pte) & _PAGE_ACCESSED; }
180 
181 static inline pte_t pte_wrprotect(pte_t pte)	{ pte_val(pte) |= _PAGE_RONLY; return pte; }
182 static inline pte_t pte_mkclean(pte_t pte)	{ pte_val(pte) &= ~_PAGE_DIRTY; return pte; }
183 static inline pte_t pte_mkold(pte_t pte)	{ pte_val(pte) &= ~_PAGE_ACCESSED; return pte; }
184 static inline pte_t pte_mkwrite(pte_t pte)	{ pte_val(pte) &= ~_PAGE_RONLY; return pte; }
185 static inline pte_t pte_mkdirty(pte_t pte)	{ pte_val(pte) |= _PAGE_DIRTY; return pte; }
186 static inline pte_t pte_mkyoung(pte_t pte)	{ pte_val(pte) |= _PAGE_ACCESSED; return pte; }
187 static inline pte_t pte_mknocache(pte_t pte)
188 {
189 	pte_val(pte) = (pte_val(pte) & _CACHEMASK040) | m68k_pgtable_cachemode;
190 	return pte;
191 }
192 static inline pte_t pte_mkcache(pte_t pte)
193 {
194 	pte_val(pte) = (pte_val(pte) & _CACHEMASK040) | m68k_supervisor_cachemode;
195 	return pte;
196 }
197 
198 #define swapper_pg_dir kernel_pg_dir
199 extern pgd_t kernel_pg_dir[128];
200 
201 /* Encode and de-code a swap entry (must be !pte_none(e) && !pte_present(e)) */
202 #define __swp_type(x)		(((x).val >> 4) & 0xff)
203 #define __swp_offset(x)		((x).val >> 12)
204 #define __swp_entry(type, offset) ((swp_entry_t) { ((type) << 4) | ((offset) << 12) })
205 #define __pte_to_swp_entry(pte)	((swp_entry_t) { pte_val(pte) })
206 #define __swp_entry_to_pte(x)	((pte_t) { (x).val })
207 
208 #endif	/* !__ASSEMBLY__ */
209 #endif /* _MOTOROLA_PGTABLE_H */
210