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 /*
70  * Page protections for initialising protection_map. The sun3 has only two
71  * protection settings, valid (implying read and execute) and writeable. These
72  * are as close as we can get...
73  */
74 #define __P000	PAGE_NONE
75 #define __P001	PAGE_READONLY
76 #define __P010	PAGE_COPY
77 #define __P011	PAGE_COPY
78 #define __P100	PAGE_READONLY
79 #define __P101	PAGE_READONLY
80 #define __P110	PAGE_COPY
81 #define __P111	PAGE_COPY
82 
83 #define __S000	PAGE_NONE
84 #define __S001	PAGE_READONLY
85 #define __S010	PAGE_SHARED
86 #define __S011	PAGE_SHARED
87 #define __S100	PAGE_READONLY
88 #define __S101	PAGE_READONLY
89 #define __S110	PAGE_SHARED
90 #define __S111	PAGE_SHARED
91 
92 /* Use these fake page-protections on PMDs. */
93 #define SUN3_PMD_VALID	(0x00000001)
94 #define SUN3_PMD_MASK	(0x0000003F)
95 #define SUN3_PMD_MAGIC	(0x0000002B)
96 
97 #ifndef __ASSEMBLY__
98 
99 /*
100  * Conversion functions: convert a page and protection to a page entry,
101  * and a page entry and page directory to the page they refer to.
102  */
103 #define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot))
104 
105 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
106 {
107 	pte_val(pte) = (pte_val(pte) & SUN3_PAGE_CHG_MASK) | pgprot_val(newprot);
108 	return pte;
109 }
110 
111 #define pmd_set(pmdp,ptep) do {} while (0)
112 
113 static inline void pgd_set(pgd_t *pgdp, pmd_t *pmdp)
114 {
115 	pgd_val(*pgdp) = virt_to_phys(pmdp);
116 }
117 
118 #define __pte_page(pte) \
119 ((unsigned long) __va ((pte_val (pte) & SUN3_PAGE_PGNUM_MASK) << PAGE_SHIFT))
120 #define __pmd_page(pmd) \
121 ((unsigned long) __va (pmd_val (pmd) & PAGE_MASK))
122 
123 static inline int pte_none (pte_t pte) { return !pte_val (pte); }
124 static inline int pte_present (pte_t pte) { return pte_val (pte) & SUN3_PAGE_VALID; }
125 static inline void pte_clear (struct mm_struct *mm, unsigned long addr, pte_t *ptep)
126 {
127 	pte_val (*ptep) = 0;
128 }
129 
130 #define pte_pfn(pte)            (pte_val(pte) & SUN3_PAGE_PGNUM_MASK)
131 #define pfn_pte(pfn, pgprot) \
132 ({ pte_t __pte; pte_val(__pte) = pfn | pgprot_val(pgprot); __pte; })
133 
134 #define pte_page(pte)		virt_to_page(__pte_page(pte))
135 #define pmd_page(pmd)		virt_to_page(__pmd_page(pmd))
136 
137 
138 static inline int pmd_none2 (pmd_t *pmd) { return !pmd_val (*pmd); }
139 #define pmd_none(pmd) pmd_none2(&(pmd))
140 //static inline int pmd_bad (pmd_t pmd) { return (pmd_val (pmd) & SUN3_PMD_MASK) != SUN3_PMD_MAGIC; }
141 static inline int pmd_bad2 (pmd_t *pmd) { return 0; }
142 #define pmd_bad(pmd) pmd_bad2(&(pmd))
143 static inline int pmd_present2 (pmd_t *pmd) { return pmd_val (*pmd) & SUN3_PMD_VALID; }
144 /* #define pmd_present(pmd) pmd_present2(&(pmd)) */
145 #define pmd_present(pmd) (!pmd_none2(&(pmd)))
146 static inline void pmd_clear (pmd_t *pmdp) { pmd_val (*pmdp) = 0; }
147 
148 static inline int pgd_none (pgd_t pgd) { return 0; }
149 static inline int pgd_bad (pgd_t pgd) { return 0; }
150 static inline int pgd_present (pgd_t pgd) { return 1; }
151 static inline void pgd_clear (pgd_t *pgdp) {}
152 
153 
154 #define pte_ERROR(e) \
155 	pr_err("%s:%d: bad pte %08lx.\n", __FILE__, __LINE__, pte_val(e))
156 #define pmd_ERROR(e) \
157 	pr_err("%s:%d: bad pmd %08lx.\n", __FILE__, __LINE__, pmd_val(e))
158 #define pgd_ERROR(e) \
159 	pr_err("%s:%d: bad pgd %08lx.\n", __FILE__, __LINE__, pgd_val(e))
160 
161 
162 /*
163  * The following only work if pte_present() is true.
164  * Undefined behaviour if not...
165  * [we have the full set here even if they don't change from m68k]
166  */
167 static inline int pte_write(pte_t pte)		{ return pte_val(pte) & SUN3_PAGE_WRITEABLE; }
168 static inline int pte_dirty(pte_t pte)		{ return pte_val(pte) & SUN3_PAGE_MODIFIED; }
169 static inline int pte_young(pte_t pte)		{ return pte_val(pte) & SUN3_PAGE_ACCESSED; }
170 static inline int pte_special(pte_t pte)	{ return 0; }
171 
172 static inline pte_t pte_wrprotect(pte_t pte)	{ pte_val(pte) &= ~SUN3_PAGE_WRITEABLE; return pte; }
173 static inline pte_t pte_mkclean(pte_t pte)	{ pte_val(pte) &= ~SUN3_PAGE_MODIFIED; return pte; }
174 static inline pte_t pte_mkold(pte_t pte)	{ pte_val(pte) &= ~SUN3_PAGE_ACCESSED; return pte; }
175 static inline pte_t pte_mkwrite(pte_t pte)	{ pte_val(pte) |= SUN3_PAGE_WRITEABLE; return pte; }
176 static inline pte_t pte_mkdirty(pte_t pte)	{ pte_val(pte) |= SUN3_PAGE_MODIFIED; return pte; }
177 static inline pte_t pte_mkyoung(pte_t pte)	{ pte_val(pte) |= SUN3_PAGE_ACCESSED; return pte; }
178 static inline pte_t pte_mknocache(pte_t pte)	{ pte_val(pte) |= SUN3_PAGE_NOCACHE; return pte; }
179 // use this version when caches work...
180 //static inline pte_t pte_mkcache(pte_t pte)	{ pte_val(pte) &= SUN3_PAGE_NOCACHE; return pte; }
181 // until then, use:
182 static inline pte_t pte_mkcache(pte_t pte)	{ return pte; }
183 static inline pte_t pte_mkspecial(pte_t pte)	{ return pte; }
184 
185 extern pgd_t swapper_pg_dir[PTRS_PER_PGD];
186 extern pgd_t kernel_pg_dir[PTRS_PER_PGD];
187 
188 /* Find an entry in a pagetable directory. */
189 #define pgd_index(address)     ((address) >> PGDIR_SHIFT)
190 
191 #define pgd_offset(mm, address) \
192 ((mm)->pgd + pgd_index(address))
193 
194 /* Find an entry in a kernel pagetable directory. */
195 #define pgd_offset_k(address) pgd_offset(&init_mm, address)
196 
197 /* Find an entry in the second-level pagetable. */
198 static inline pmd_t *pmd_offset (pgd_t *pgd, unsigned long address)
199 {
200 	return (pmd_t *) pgd;
201 }
202 
203 /* Find an entry in the third-level pagetable. */
204 #define pte_index(address) ((address >> PAGE_SHIFT) & (PTRS_PER_PTE-1))
205 #define pte_offset_kernel(pmd, address) ((pte_t *) __pmd_page(*pmd) + pte_index(address))
206 #define pte_offset_map(pmd, address) ((pte_t *)page_address(pmd_page(*pmd)) + pte_index(address))
207 #define pte_unmap(pte) do { } while (0)
208 
209 /* Macros to (de)construct the fake PTEs representing swap pages. */
210 #define __swp_type(x)		((x).val & 0x7F)
211 #define __swp_offset(x)		(((x).val) >> 7)
212 #define __swp_entry(type,offset) ((swp_entry_t) { ((type) | ((offset) << 7)) })
213 #define __pte_to_swp_entry(pte)	((swp_entry_t) { pte_val(pte) })
214 #define __swp_entry_to_pte(x)	((pte_t) { (x).val })
215 
216 #endif	/* !__ASSEMBLY__ */
217 #endif	/* !_SUN3_PGTABLE_H */
218