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 #ifndef __ASSEMBLY__
75
76 /*
77 * Conversion functions: convert a page and protection to a page entry,
78 * and a page entry and page directory to the page they refer to.
79 */
80 #define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot))
81
pte_modify(pte_t pte,pgprot_t newprot)82 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
83 {
84 pte_val(pte) = (pte_val(pte) & SUN3_PAGE_CHG_MASK) | pgprot_val(newprot);
85 return pte;
86 }
87
88 #define pmd_set(pmdp,ptep) do {} while (0)
89
90 #define __pte_page(pte) \
91 ((unsigned long) __va ((pte_val (pte) & SUN3_PAGE_PGNUM_MASK) << PAGE_SHIFT))
92
pmd_page_vaddr(pmd_t pmd)93 static inline unsigned long pmd_page_vaddr(pmd_t pmd)
94 {
95 return (unsigned long)__va(pmd_val(pmd) & PAGE_MASK);
96 }
97
pte_none(pte_t pte)98 static inline int pte_none (pte_t pte) { return !pte_val (pte); }
pte_present(pte_t pte)99 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)100 static inline void pte_clear (struct mm_struct *mm, unsigned long addr, pte_t *ptep)
101 {
102 pte_val (*ptep) = 0;
103 }
104
105 #define pte_pfn(pte) (pte_val(pte) & SUN3_PAGE_PGNUM_MASK)
106 #define pfn_pte(pfn, pgprot) \
107 ({ pte_t __pte; pte_val(__pte) = pfn | pgprot_val(pgprot); __pte; })
108
109 #define pte_page(pte) virt_to_page(__pte_page(pte))
110 #define pmd_pfn(pmd) (pmd_val(pmd) >> PAGE_SHIFT)
111 #define pmd_page(pmd) virt_to_page(pmd_page_vaddr(pmd))
112
113
pmd_none2(pmd_t * pmd)114 static inline int pmd_none2 (pmd_t *pmd) { return !pmd_val (*pmd); }
115 #define pmd_none(pmd) pmd_none2(&(pmd))
116 //static inline int pmd_bad (pmd_t pmd) { return (pmd_val (pmd) & SUN3_PMD_MASK) != SUN3_PMD_MAGIC; }
pmd_bad2(pmd_t * pmd)117 static inline int pmd_bad2 (pmd_t *pmd) { return 0; }
118 #define pmd_bad(pmd) pmd_bad2(&(pmd))
pmd_present2(pmd_t * pmd)119 static inline int pmd_present2 (pmd_t *pmd) { return pmd_val (*pmd) & SUN3_PMD_VALID; }
120 /* #define pmd_present(pmd) pmd_present2(&(pmd)) */
121 #define pmd_present(pmd) (!pmd_none2(&(pmd)))
pmd_clear(pmd_t * pmdp)122 static inline void pmd_clear (pmd_t *pmdp) { pmd_val (*pmdp) = 0; }
123
124
125 #define pte_ERROR(e) \
126 pr_err("%s:%d: bad pte %08lx.\n", __FILE__, __LINE__, pte_val(e))
127 #define pgd_ERROR(e) \
128 pr_err("%s:%d: bad pgd %08lx.\n", __FILE__, __LINE__, pgd_val(e))
129
130
131 /*
132 * The following only work if pte_present() is true.
133 * Undefined behaviour if not...
134 * [we have the full set here even if they don't change from m68k]
135 */
pte_write(pte_t pte)136 static inline int pte_write(pte_t pte) { return pte_val(pte) & SUN3_PAGE_WRITEABLE; }
pte_dirty(pte_t pte)137 static inline int pte_dirty(pte_t pte) { return pte_val(pte) & SUN3_PAGE_MODIFIED; }
pte_young(pte_t pte)138 static inline int pte_young(pte_t pte) { return pte_val(pte) & SUN3_PAGE_ACCESSED; }
139
pte_wrprotect(pte_t pte)140 static inline pte_t pte_wrprotect(pte_t pte) { pte_val(pte) &= ~SUN3_PAGE_WRITEABLE; return pte; }
pte_mkclean(pte_t pte)141 static inline pte_t pte_mkclean(pte_t pte) { pte_val(pte) &= ~SUN3_PAGE_MODIFIED; return pte; }
pte_mkold(pte_t pte)142 static inline pte_t pte_mkold(pte_t pte) { pte_val(pte) &= ~SUN3_PAGE_ACCESSED; return pte; }
pte_mkwrite(pte_t pte)143 static inline pte_t pte_mkwrite(pte_t pte) { pte_val(pte) |= SUN3_PAGE_WRITEABLE; return pte; }
pte_mkdirty(pte_t pte)144 static inline pte_t pte_mkdirty(pte_t pte) { pte_val(pte) |= SUN3_PAGE_MODIFIED; return pte; }
pte_mkyoung(pte_t pte)145 static inline pte_t pte_mkyoung(pte_t pte) { pte_val(pte) |= SUN3_PAGE_ACCESSED; return pte; }
pte_mknocache(pte_t pte)146 static inline pte_t pte_mknocache(pte_t pte) { pte_val(pte) |= SUN3_PAGE_NOCACHE; return pte; }
147 // use this version when caches work...
148 //static inline pte_t pte_mkcache(pte_t pte) { pte_val(pte) &= SUN3_PAGE_NOCACHE; return pte; }
149 // until then, use:
pte_mkcache(pte_t pte)150 static inline pte_t pte_mkcache(pte_t pte) { return pte; }
151
152 extern pgd_t swapper_pg_dir[PTRS_PER_PGD];
153 extern pgd_t kernel_pg_dir[PTRS_PER_PGD];
154
155 /* Macros to (de)construct the fake PTEs representing swap pages. */
156 #define __swp_type(x) ((x).val & 0x7F)
157 #define __swp_offset(x) (((x).val) >> 7)
158 #define __swp_entry(type,offset) ((swp_entry_t) { ((type) | ((offset) << 7)) })
159 #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) })
160 #define __swp_entry_to_pte(x) ((pte_t) { (x).val })
161
162 #endif /* !__ASSEMBLY__ */
163 #endif /* !_SUN3_PGTABLE_H */
164