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
pte_modify(pte_t pte,pgprot_t newprot)79 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
80 {
81 pte_val(pte) = (pte_val(pte) & SUN3_PAGE_CHG_MASK) | pgprot_val(newprot);
82 return pte;
83 }
84
85 #define pmd_set(pmdp,ptep) do {} while (0)
86
87 #define __pte_page(pte) \
88 (__va ((pte_val (pte) & SUN3_PAGE_PGNUM_MASK) << PAGE_SHIFT))
89
pmd_page_vaddr(pmd_t pmd)90 static inline unsigned long pmd_page_vaddr(pmd_t pmd)
91 {
92 return (unsigned long)__va(pmd_val(pmd) & PAGE_MASK);
93 }
94
pte_none(pte_t pte)95 static inline int pte_none (pte_t pte) { return !pte_val (pte); }
pte_present(pte_t pte)96 static inline int pte_present (pte_t pte) { return pte_val (pte) & SUN3_PAGE_VALID; }
pte_clear(struct mm_struct * mm,unsigned long addr,pte_t * ptep)97 static inline void pte_clear (struct mm_struct *mm, unsigned long addr, pte_t *ptep)
98 {
99 pte_val (*ptep) = 0;
100 }
101
102 #define PFN_PTE_SHIFT 0
103 #define pte_pfn(pte) (pte_val(pte) & SUN3_PAGE_PGNUM_MASK)
104 #define pfn_pte(pfn, pgprot) \
105 ({ pte_t __pte; pte_val(__pte) = pfn | pgprot_val(pgprot); __pte; })
106
107 #define pte_page(pte) virt_to_page(__pte_page(pte))
108 #define pmd_pfn(pmd) (pmd_val(pmd) >> PAGE_SHIFT)
109 #define pmd_page(pmd) virt_to_page((void *)pmd_page_vaddr(pmd))
110
111
pmd_none2(pmd_t * pmd)112 static inline int pmd_none2 (pmd_t *pmd) { return !pmd_val (*pmd); }
113 #define pmd_none(pmd) pmd_none2(&(pmd))
114 //static inline int pmd_bad (pmd_t pmd) { return (pmd_val (pmd) & SUN3_PMD_MASK) != SUN3_PMD_MAGIC; }
pmd_bad2(pmd_t * pmd)115 static inline int pmd_bad2 (pmd_t *pmd) { return 0; }
116 #define pmd_bad(pmd) pmd_bad2(&(pmd))
pmd_present2(pmd_t * pmd)117 static inline int pmd_present2 (pmd_t *pmd) { return pmd_val (*pmd) & SUN3_PMD_VALID; }
118 /* #define pmd_present(pmd) pmd_present2(&(pmd)) */
119 #define pmd_present(pmd) (!pmd_none2(&(pmd)))
pmd_clear(pmd_t * pmdp)120 static inline void pmd_clear (pmd_t *pmdp) { pmd_val (*pmdp) = 0; }
121
122
123 #define pte_ERROR(e) \
124 pr_err("%s:%d: bad pte %08lx.\n", __FILE__, __LINE__, pte_val(e))
125 #define pgd_ERROR(e) \
126 pr_err("%s:%d: bad pgd %08lx.\n", __FILE__, __LINE__, pgd_val(e))
127
128
129 /*
130 * The following only work if pte_present() is true.
131 * Undefined behaviour if not...
132 * [we have the full set here even if they don't change from m68k]
133 */
pte_write(pte_t pte)134 static inline int pte_write(pte_t pte) { return pte_val(pte) & SUN3_PAGE_WRITEABLE; }
pte_dirty(pte_t pte)135 static inline int pte_dirty(pte_t pte) { return pte_val(pte) & SUN3_PAGE_MODIFIED; }
pte_young(pte_t pte)136 static inline int pte_young(pte_t pte) { return pte_val(pte) & SUN3_PAGE_ACCESSED; }
137
pte_wrprotect(pte_t pte)138 static inline pte_t pte_wrprotect(pte_t pte) { pte_val(pte) &= ~SUN3_PAGE_WRITEABLE; return pte; }
pte_mkclean(pte_t pte)139 static inline pte_t pte_mkclean(pte_t pte) { pte_val(pte) &= ~SUN3_PAGE_MODIFIED; return pte; }
pte_mkold(pte_t pte)140 static inline pte_t pte_mkold(pte_t pte) { pte_val(pte) &= ~SUN3_PAGE_ACCESSED; return pte; }
pte_mkwrite_novma(pte_t pte)141 static inline pte_t pte_mkwrite_novma(pte_t pte){ pte_val(pte) |= SUN3_PAGE_WRITEABLE; return pte; }
pte_mkdirty(pte_t pte)142 static inline pte_t pte_mkdirty(pte_t pte) { pte_val(pte) |= SUN3_PAGE_MODIFIED; return pte; }
pte_mkyoung(pte_t pte)143 static inline pte_t pte_mkyoung(pte_t pte) { pte_val(pte) |= SUN3_PAGE_ACCESSED; return pte; }
pte_mknocache(pte_t pte)144 static inline pte_t pte_mknocache(pte_t pte) { pte_val(pte) |= SUN3_PAGE_NOCACHE; return pte; }
145 // use this version when caches work...
146 //static inline pte_t pte_mkcache(pte_t pte) { pte_val(pte) &= SUN3_PAGE_NOCACHE; return pte; }
147 // until then, use:
pte_mkcache(pte_t pte)148 static inline pte_t pte_mkcache(pte_t pte) { return pte; }
149
150 extern pgd_t swapper_pg_dir[PTRS_PER_PGD];
151 extern pgd_t kernel_pg_dir[PTRS_PER_PGD];
152
153 /*
154 * Encode/decode swap entries and swap PTEs. Swap PTEs are all PTEs that
155 * are !pte_none() && !pte_present().
156 *
157 * Format of swap PTEs:
158 *
159 * 3 3 2 2 2 2 2 2 2 2 2 2 1 1 1 1 1 1 1 1 1 1
160 * 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
161 * 0 <--------------------- offset ----------------> E <- type -->
162 *
163 * E is the exclusive marker that is not stored in swap entries.
164 */
165 #define __swp_type(x) ((x).val & 0x3f)
166 #define __swp_offset(x) (((x).val) >> 7)
167 #define __swp_entry(type, offset) ((swp_entry_t) { (((type) & 0x3f) | \
168 (((offset) << 7) & ~SUN3_PAGE_VALID)) })
169 #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) })
170 #define __swp_entry_to_pte(x) ((pte_t) { (x).val })
171
pte_swp_exclusive(pte_t pte)172 static inline bool pte_swp_exclusive(pte_t pte)
173 {
174 return pte_val(pte) & _PAGE_SWP_EXCLUSIVE;
175 }
176
pte_swp_mkexclusive(pte_t pte)177 static inline pte_t pte_swp_mkexclusive(pte_t pte)
178 {
179 pte_val(pte) |= _PAGE_SWP_EXCLUSIVE;
180 return pte;
181 }
182
pte_swp_clear_exclusive(pte_t pte)183 static inline pte_t pte_swp_clear_exclusive(pte_t pte)
184 {
185 pte_val(pte) &= ~_PAGE_SWP_EXCLUSIVE;
186 return pte;
187 }
188
189 #endif /* !__ASSEMBLY__ */
190 #endif /* !_SUN3_PGTABLE_H */
191