1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _SUN3_PGTABLE_H
3 #define _SUN3_PGTABLE_H
4
5 #include <asm/sun3mmu.h>
6
7 #ifndef __ASSEMBLY__
8 #include <asm/virtconvert.h>
9 #include <linux/linkage.h>
10
11 /*
12 * This file contains all the things which change drastically for the sun3
13 * pagetable stuff, to avoid making too much of a mess of the generic m68k
14 * `pgtable.h'; this should only be included from the generic file. --m
15 */
16
17 /* For virtual address to physical address conversion */
18 #define VTOP(addr) __pa(addr)
19 #define PTOV(addr) __va(addr)
20
21
22 #endif /* !__ASSEMBLY__ */
23
24 /* These need to be defined for compatibility although the sun3 doesn't use them */
25 #define _PAGE_NOCACHE030 0x040
26 #define _CACHEMASK040 (~0x060)
27 #define _PAGE_NOCACHE_S 0x040
28
29 /* Page protection values within PTE. */
30 #define SUN3_PAGE_VALID (0x80000000)
31 #define SUN3_PAGE_WRITEABLE (0x40000000)
32 #define SUN3_PAGE_SYSTEM (0x20000000)
33 #define SUN3_PAGE_NOCACHE (0x10000000)
34 #define SUN3_PAGE_ACCESSED (0x02000000)
35 #define SUN3_PAGE_MODIFIED (0x01000000)
36
37
38 /* Externally used page protection values. */
39 #define _PAGE_PRESENT (SUN3_PAGE_VALID)
40 #define _PAGE_ACCESSED (SUN3_PAGE_ACCESSED)
41
42 /* Compound page protection values. */
43 //todo: work out which ones *should* have SUN3_PAGE_NOCACHE and fix...
44 // is it just PAGE_KERNEL and PAGE_SHARED?
45 #define PAGE_NONE __pgprot(SUN3_PAGE_VALID \
46 | SUN3_PAGE_ACCESSED \
47 | SUN3_PAGE_NOCACHE)
48 #define PAGE_SHARED __pgprot(SUN3_PAGE_VALID \
49 | SUN3_PAGE_WRITEABLE \
50 | SUN3_PAGE_ACCESSED \
51 | SUN3_PAGE_NOCACHE)
52 #define PAGE_COPY __pgprot(SUN3_PAGE_VALID \
53 | SUN3_PAGE_ACCESSED \
54 | SUN3_PAGE_NOCACHE)
55 #define PAGE_READONLY __pgprot(SUN3_PAGE_VALID \
56 | SUN3_PAGE_ACCESSED \
57 | SUN3_PAGE_NOCACHE)
58 #define PAGE_KERNEL __pgprot(SUN3_PAGE_VALID \
59 | SUN3_PAGE_WRITEABLE \
60 | SUN3_PAGE_SYSTEM \
61 | SUN3_PAGE_NOCACHE \
62 | SUN3_PAGE_ACCESSED \
63 | SUN3_PAGE_MODIFIED)
64 #define PAGE_INIT __pgprot(SUN3_PAGE_VALID \
65 | SUN3_PAGE_WRITEABLE \
66 | SUN3_PAGE_SYSTEM \
67 | SUN3_PAGE_NOCACHE)
68
69 /* Use these fake page-protections on PMDs. */
70 #define SUN3_PMD_VALID (0x00000001)
71 #define SUN3_PMD_MASK (0x0000003F)
72 #define SUN3_PMD_MAGIC (0x0000002B)
73
74 /* We borrow bit 6 to store the exclusive marker in swap PTEs. */
75 #define _PAGE_SWP_EXCLUSIVE 0x040
76
77 #ifndef __ASSEMBLY__
78
79 /*
80 * Conversion functions: convert a page and protection to a page entry,
81 * and a page entry and page directory to the page they refer to.
82 */
83 #define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot))
84
85 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
86 {
87 pte_val(pte) = (pte_val(pte) & SUN3_PAGE_CHG_MASK) | pgprot_val(newprot);
88 return pte;
89 }
90
91 #define pmd_set(pmdp,ptep) do {} while (0)
92
93 #define __pte_page(pte) \
94 (__va ((pte_val (pte) & SUN3_PAGE_PGNUM_MASK) << PAGE_SHIFT))
95
96 static inline unsigned long pmd_page_vaddr(pmd_t pmd)
97 {
98 return (unsigned long)__va(pmd_val(pmd) & PAGE_MASK);
99 }
100
101 static inline int pte_none (pte_t pte) { return !pte_val (pte); }
102 static inline int pte_present (pte_t pte) { return pte_val (pte) & SUN3_PAGE_VALID; }
103 static inline void pte_clear (struct mm_struct *mm, unsigned long addr, pte_t *ptep)
104 {
105 pte_val (*ptep) = 0;
106 }
107
108 #define PFN_PTE_SHIFT 0
109 #define pte_pfn(pte) (pte_val(pte) & SUN3_PAGE_PGNUM_MASK)
110 #define pfn_pte(pfn, pgprot) \
111 ({ pte_t __pte; pte_val(__pte) = pfn | pgprot_val(pgprot); __pte; })
112
113 #define pte_page(pte) virt_to_page(__pte_page(pte))
114 #define pmd_pfn(pmd) (pmd_val(pmd) >> PAGE_SHIFT)
115 #define pmd_page(pmd) virt_to_page((void *)pmd_page_vaddr(pmd))
116
117
118 static inline int pmd_none2 (pmd_t *pmd) { return !pmd_val (*pmd); }
119 #define pmd_none(pmd) pmd_none2(&(pmd))
120 //static inline int pmd_bad (pmd_t pmd) { return (pmd_val (pmd) & SUN3_PMD_MASK) != SUN3_PMD_MAGIC; }
121 static inline int pmd_bad2 (pmd_t *pmd) { return 0; }
122 #define pmd_bad(pmd) pmd_bad2(&(pmd))
123 static inline int pmd_present2 (pmd_t *pmd) { return pmd_val (*pmd) & SUN3_PMD_VALID; }
124 /* #define pmd_present(pmd) pmd_present2(&(pmd)) */
125 #define pmd_present(pmd) (!pmd_none2(&(pmd)))
126 static inline void pmd_clear (pmd_t *pmdp) { pmd_val (*pmdp) = 0; }
127
128
129 #define pte_ERROR(e) \
130 pr_err("%s:%d: bad pte %08lx.\n", __FILE__, __LINE__, pte_val(e))
131 #define pgd_ERROR(e) \
132 pr_err("%s:%d: bad pgd %08lx.\n", __FILE__, __LINE__, pgd_val(e))
133
134
135 /*
136 * The following only work if pte_present() is true.
137 * Undefined behaviour if not...
138 * [we have the full set here even if they don't change from m68k]
139 */
140 static inline int pte_write(pte_t pte) { return pte_val(pte) & SUN3_PAGE_WRITEABLE; }
141 static inline int pte_dirty(pte_t pte) { return pte_val(pte) & SUN3_PAGE_MODIFIED; }
142 static inline int pte_young(pte_t pte) { return pte_val(pte) & SUN3_PAGE_ACCESSED; }
143
144 static inline pte_t pte_wrprotect(pte_t pte) { pte_val(pte) &= ~SUN3_PAGE_WRITEABLE; return pte; }
145 static inline pte_t pte_mkclean(pte_t pte) { pte_val(pte) &= ~SUN3_PAGE_MODIFIED; return pte; }
146 static inline pte_t pte_mkold(pte_t pte) { pte_val(pte) &= ~SUN3_PAGE_ACCESSED; return pte; }
147 static inline pte_t pte_mkwrite_novma(pte_t pte){ pte_val(pte) |= SUN3_PAGE_WRITEABLE; return pte; }
148 static inline pte_t pte_mkdirty(pte_t pte) { pte_val(pte) |= SUN3_PAGE_MODIFIED; return pte; }
149 static inline pte_t pte_mkyoung(pte_t pte) { pte_val(pte) |= SUN3_PAGE_ACCESSED; return pte; }
150 static inline pte_t pte_mknocache(pte_t pte) { pte_val(pte) |= SUN3_PAGE_NOCACHE; return pte; }
151 // use this version when caches work...
152 //static inline pte_t pte_mkcache(pte_t pte) { pte_val(pte) &= SUN3_PAGE_NOCACHE; return pte; }
153 // until then, use:
154 static inline pte_t pte_mkcache(pte_t pte) { return pte; }
155
156 extern pgd_t swapper_pg_dir[PTRS_PER_PGD];
157 extern pgd_t kernel_pg_dir[PTRS_PER_PGD];
158
159 /*
160 * Encode/decode swap entries and swap PTEs. Swap PTEs are all PTEs that
161 * are !pte_none() && !pte_present().
162 *
163 * Format of swap PTEs:
164 *
165 * 3 3 2 2 2 2 2 2 2 2 2 2 1 1 1 1 1 1 1 1 1 1
166 * 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
167 * 0 <--------------------- offset ----------------> E <- type -->
168 *
169 * E is the exclusive marker that is not stored in swap entries.
170 */
171 #define __swp_type(x) ((x).val & 0x3f)
172 #define __swp_offset(x) (((x).val) >> 7)
173 #define __swp_entry(type, offset) ((swp_entry_t) { (((type) & 0x3f) | \
174 (((offset) << 7) & ~SUN3_PAGE_VALID)) })
175 #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) })
176 #define __swp_entry_to_pte(x) ((pte_t) { (x).val })
177
178 static inline int pte_swp_exclusive(pte_t pte)
179 {
180 return pte_val(pte) & _PAGE_SWP_EXCLUSIVE;
181 }
182
183 static inline pte_t pte_swp_mkexclusive(pte_t pte)
184 {
185 pte_val(pte) |= _PAGE_SWP_EXCLUSIVE;
186 return pte;
187 }
188
189 static inline pte_t pte_swp_clear_exclusive(pte_t pte)
190 {
191 pte_val(pte) &= ~_PAGE_SWP_EXCLUSIVE;
192 return pte;
193 }
194
195 #endif /* !__ASSEMBLY__ */
196 #endif /* !_SUN3_PGTABLE_H */
197
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