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 ((unsigned long) __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 pte_pfn(pte)            (pte_val(pte) & SUN3_PAGE_PGNUM_MASK)
109 #define pfn_pte(pfn, pgprot) \
110 ({ pte_t __pte; pte_val(__pte) = pfn | pgprot_val(pgprot); __pte; })
111 
112 #define pte_page(pte)		virt_to_page(__pte_page(pte))
113 #define pmd_pfn(pmd)		(pmd_val(pmd) >> PAGE_SHIFT)
114 #define pmd_page(pmd)		virt_to_page(pmd_page_vaddr(pmd))
115 
116 
117 static inline int pmd_none2 (pmd_t *pmd) { return !pmd_val (*pmd); }
118 #define pmd_none(pmd) pmd_none2(&(pmd))
119 //static inline int pmd_bad (pmd_t pmd) { return (pmd_val (pmd) & SUN3_PMD_MASK) != SUN3_PMD_MAGIC; }
120 static inline int pmd_bad2 (pmd_t *pmd) { return 0; }
121 #define pmd_bad(pmd) pmd_bad2(&(pmd))
122 static inline int pmd_present2 (pmd_t *pmd) { return pmd_val (*pmd) & SUN3_PMD_VALID; }
123 /* #define pmd_present(pmd) pmd_present2(&(pmd)) */
124 #define pmd_present(pmd) (!pmd_none2(&(pmd)))
125 static inline void pmd_clear (pmd_t *pmdp) { pmd_val (*pmdp) = 0; }
126 
127 
128 #define pte_ERROR(e) \
129 	pr_err("%s:%d: bad pte %08lx.\n", __FILE__, __LINE__, pte_val(e))
130 #define pgd_ERROR(e) \
131 	pr_err("%s:%d: bad pgd %08lx.\n", __FILE__, __LINE__, pgd_val(e))
132 
133 
134 /*
135  * The following only work if pte_present() is true.
136  * Undefined behaviour if not...
137  * [we have the full set here even if they don't change from m68k]
138  */
139 static inline int pte_write(pte_t pte)		{ return pte_val(pte) & SUN3_PAGE_WRITEABLE; }
140 static inline int pte_dirty(pte_t pte)		{ return pte_val(pte) & SUN3_PAGE_MODIFIED; }
141 static inline int pte_young(pte_t pte)		{ return pte_val(pte) & SUN3_PAGE_ACCESSED; }
142 
143 static inline pte_t pte_wrprotect(pte_t pte)	{ pte_val(pte) &= ~SUN3_PAGE_WRITEABLE; return pte; }
144 static inline pte_t pte_mkclean(pte_t pte)	{ pte_val(pte) &= ~SUN3_PAGE_MODIFIED; return pte; }
145 static inline pte_t pte_mkold(pte_t pte)	{ pte_val(pte) &= ~SUN3_PAGE_ACCESSED; return pte; }
146 static inline pte_t pte_mkwrite(pte_t pte)	{ pte_val(pte) |= SUN3_PAGE_WRITEABLE; return pte; }
147 static inline pte_t pte_mkdirty(pte_t pte)	{ pte_val(pte) |= SUN3_PAGE_MODIFIED; return pte; }
148 static inline pte_t pte_mkyoung(pte_t pte)	{ pte_val(pte) |= SUN3_PAGE_ACCESSED; return pte; }
149 static inline pte_t pte_mknocache(pte_t pte)	{ pte_val(pte) |= SUN3_PAGE_NOCACHE; return pte; }
150 // use this version when caches work...
151 //static inline pte_t pte_mkcache(pte_t pte)	{ pte_val(pte) &= SUN3_PAGE_NOCACHE; return pte; }
152 // until then, use:
153 static inline pte_t pte_mkcache(pte_t pte)	{ return pte; }
154 
155 extern pgd_t swapper_pg_dir[PTRS_PER_PGD];
156 extern pgd_t kernel_pg_dir[PTRS_PER_PGD];
157 
158 /*
159  * Encode/decode swap entries and swap PTEs. Swap PTEs are all PTEs that
160  * are !pte_none() && !pte_present().
161  *
162  * Format of swap PTEs:
163  *
164  *   3 3 2 2 2 2 2 2 2 2 2 2 1 1 1 1 1 1 1 1 1 1
165  *   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
166  *   0 <--------------------- offset ----------------> E <- type -->
167  *
168  *   E is the exclusive marker that is not stored in swap entries.
169  */
170 #define __swp_type(x)		((x).val & 0x3f)
171 #define __swp_offset(x)		(((x).val) >> 7)
172 #define __swp_entry(type, offset) ((swp_entry_t) { (((type) & 0x3f) | \
173 						   (((offset) << 7) & ~SUN3_PAGE_VALID)) })
174 #define __pte_to_swp_entry(pte)	((swp_entry_t) { pte_val(pte) })
175 #define __swp_entry_to_pte(x)	((pte_t) { (x).val })
176 
177 static inline int pte_swp_exclusive(pte_t pte)
178 {
179 	return pte_val(pte) & _PAGE_SWP_EXCLUSIVE;
180 }
181 
182 static inline pte_t pte_swp_mkexclusive(pte_t pte)
183 {
184 	pte_val(pte) |= _PAGE_SWP_EXCLUSIVE;
185 	return pte;
186 }
187 
188 static inline pte_t pte_swp_clear_exclusive(pte_t pte)
189 {
190 	pte_val(pte) &= ~_PAGE_SWP_EXCLUSIVE;
191 	return pte;
192 }
193 
194 #endif	/* !__ASSEMBLY__ */
195 #endif	/* !_SUN3_PGTABLE_H */
196