1 #ifndef _SUN3_PGTABLE_H
2 #define _SUN3_PGTABLE_H
3 
4 #include <asm/sun3mmu.h>
5 
6 #ifndef __ASSEMBLY__
7 #include <asm/virtconvert.h>
8 #include <linux/linkage.h>
9 
10 /*
11  * This file contains all the things which change drastically for the sun3
12  * pagetable stuff, to avoid making too much of a mess of the generic m68k
13  * `pgtable.h'; this should only be included from the generic file. --m
14  */
15 
16 /* For virtual address to physical address conversion */
17 #define VTOP(addr)	__pa(addr)
18 #define PTOV(addr)	__va(addr)
19 
20 
21 #endif	/* !__ASSEMBLY__ */
22 
23 /* These need to be defined for compatibility although the sun3 doesn't use them */
24 #define _PAGE_NOCACHE030 0x040
25 #define _CACHEMASK040   (~0x060)
26 #define _PAGE_NOCACHE_S 0x040
27 
28 /* Page protection values within PTE. */
29 #define SUN3_PAGE_VALID     (0x80000000)
30 #define SUN3_PAGE_WRITEABLE (0x40000000)
31 #define SUN3_PAGE_SYSTEM    (0x20000000)
32 #define SUN3_PAGE_NOCACHE   (0x10000000)
33 #define SUN3_PAGE_ACCESSED  (0x02000000)
34 #define SUN3_PAGE_MODIFIED  (0x01000000)
35 
36 
37 /* Externally used page protection values. */
38 #define _PAGE_PRESENT	(SUN3_PAGE_VALID)
39 #define _PAGE_ACCESSED	(SUN3_PAGE_ACCESSED)
40 
41 /* Compound page protection values. */
42 //todo: work out which ones *should* have SUN3_PAGE_NOCACHE and fix...
43 // is it just PAGE_KERNEL and PAGE_SHARED?
44 #define PAGE_NONE	__pgprot(SUN3_PAGE_VALID \
45 				 | SUN3_PAGE_ACCESSED \
46 				 | SUN3_PAGE_NOCACHE)
47 #define PAGE_SHARED	__pgprot(SUN3_PAGE_VALID \
48 				 | SUN3_PAGE_WRITEABLE \
49 				 | SUN3_PAGE_ACCESSED \
50 				 | SUN3_PAGE_NOCACHE)
51 #define PAGE_COPY	__pgprot(SUN3_PAGE_VALID \
52 				 | SUN3_PAGE_ACCESSED \
53 				 | SUN3_PAGE_NOCACHE)
54 #define PAGE_READONLY	__pgprot(SUN3_PAGE_VALID \
55 				 | SUN3_PAGE_ACCESSED \
56 				 | SUN3_PAGE_NOCACHE)
57 #define PAGE_KERNEL	__pgprot(SUN3_PAGE_VALID \
58 				 | SUN3_PAGE_WRITEABLE \
59 				 | SUN3_PAGE_SYSTEM \
60 				 | SUN3_PAGE_NOCACHE \
61 				 | SUN3_PAGE_ACCESSED \
62 				 | SUN3_PAGE_MODIFIED)
63 #define PAGE_INIT	__pgprot(SUN3_PAGE_VALID \
64 				 | SUN3_PAGE_WRITEABLE \
65 				 | SUN3_PAGE_SYSTEM \
66 				 | SUN3_PAGE_NOCACHE)
67 
68 /*
69  * Page protections for initialising protection_map. The sun3 has only two
70  * protection settings, valid (implying read and execute) and writeable. These
71  * are as close as we can get...
72  */
73 #define __P000	PAGE_NONE
74 #define __P001	PAGE_READONLY
75 #define __P010	PAGE_COPY
76 #define __P011	PAGE_COPY
77 #define __P100	PAGE_READONLY
78 #define __P101	PAGE_READONLY
79 #define __P110	PAGE_COPY
80 #define __P111	PAGE_COPY
81 
82 #define __S000	PAGE_NONE
83 #define __S001	PAGE_READONLY
84 #define __S010	PAGE_SHARED
85 #define __S011	PAGE_SHARED
86 #define __S100	PAGE_READONLY
87 #define __S101	PAGE_READONLY
88 #define __S110	PAGE_SHARED
89 #define __S111	PAGE_SHARED
90 
91 /* Use these fake page-protections on PMDs. */
92 #define SUN3_PMD_VALID	(0x00000001)
93 #define SUN3_PMD_MASK	(0x0000003F)
94 #define SUN3_PMD_MAGIC	(0x0000002B)
95 
96 #ifndef __ASSEMBLY__
97 
98 /*
99  * Conversion functions: convert a page and protection to a page entry,
100  * and a page entry and page directory to the page they refer to.
101  */
102 #define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot))
103 
104 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
105 {
106 	pte_val(pte) = (pte_val(pte) & SUN3_PAGE_CHG_MASK) | pgprot_val(newprot);
107 	return pte;
108 }
109 
110 #define pmd_set(pmdp,ptep) do {} while (0)
111 
112 static inline void pgd_set(pgd_t *pgdp, pmd_t *pmdp)
113 {
114 	pgd_val(*pgdp) = virt_to_phys(pmdp);
115 }
116 
117 #define __pte_page(pte) \
118 ((unsigned long) __va ((pte_val (pte) & SUN3_PAGE_PGNUM_MASK) << PAGE_SHIFT))
119 #define __pmd_page(pmd) \
120 ((unsigned long) __va (pmd_val (pmd) & PAGE_MASK))
121 
122 static inline int pte_none (pte_t pte) { return !pte_val (pte); }
123 static inline int pte_present (pte_t pte) { return pte_val (pte) & SUN3_PAGE_VALID; }
124 static inline void pte_clear (struct mm_struct *mm, unsigned long addr, pte_t *ptep)
125 {
126 	pte_val (*ptep) = 0;
127 }
128 
129 #define pte_pfn(pte)            (pte_val(pte) & SUN3_PAGE_PGNUM_MASK)
130 #define pfn_pte(pfn, pgprot) \
131 ({ pte_t __pte; pte_val(__pte) = pfn | pgprot_val(pgprot); __pte; })
132 
133 #define pte_page(pte)		virt_to_page(__pte_page(pte))
134 #define pmd_page(pmd)		virt_to_page(__pmd_page(pmd))
135 
136 
137 static inline int pmd_none2 (pmd_t *pmd) { return !pmd_val (*pmd); }
138 #define pmd_none(pmd) pmd_none2(&(pmd))
139 //static inline int pmd_bad (pmd_t pmd) { return (pmd_val (pmd) & SUN3_PMD_MASK) != SUN3_PMD_MAGIC; }
140 static inline int pmd_bad2 (pmd_t *pmd) { return 0; }
141 #define pmd_bad(pmd) pmd_bad2(&(pmd))
142 static inline int pmd_present2 (pmd_t *pmd) { return pmd_val (*pmd) & SUN3_PMD_VALID; }
143 /* #define pmd_present(pmd) pmd_present2(&(pmd)) */
144 #define pmd_present(pmd) (!pmd_none2(&(pmd)))
145 static inline void pmd_clear (pmd_t *pmdp) { pmd_val (*pmdp) = 0; }
146 
147 static inline int pgd_none (pgd_t pgd) { return 0; }
148 static inline int pgd_bad (pgd_t pgd) { return 0; }
149 static inline int pgd_present (pgd_t pgd) { return 1; }
150 static inline void pgd_clear (pgd_t *pgdp) {}
151 
152 
153 #define pte_ERROR(e) \
154 	printk("%s:%d: bad pte %08lx.\n", __FILE__, __LINE__, pte_val(e))
155 #define pmd_ERROR(e) \
156 	printk("%s:%d: bad pmd %08lx.\n", __FILE__, __LINE__, pmd_val(e))
157 #define pgd_ERROR(e) \
158 	printk("%s:%d: bad pgd %08lx.\n", __FILE__, __LINE__, pgd_val(e))
159 
160 
161 /*
162  * The following only work if pte_present() is true.
163  * Undefined behaviour if not...
164  * [we have the full set here even if they don't change from m68k]
165  */
166 static inline int pte_write(pte_t pte)		{ return pte_val(pte) & SUN3_PAGE_WRITEABLE; }
167 static inline int pte_dirty(pte_t pte)		{ return pte_val(pte) & SUN3_PAGE_MODIFIED; }
168 static inline int pte_young(pte_t pte)		{ return pte_val(pte) & SUN3_PAGE_ACCESSED; }
169 static inline int pte_special(pte_t pte)	{ return 0; }
170 
171 static inline pte_t pte_wrprotect(pte_t pte)	{ pte_val(pte) &= ~SUN3_PAGE_WRITEABLE; return pte; }
172 static inline pte_t pte_mkclean(pte_t pte)	{ pte_val(pte) &= ~SUN3_PAGE_MODIFIED; return pte; }
173 static inline pte_t pte_mkold(pte_t pte)	{ pte_val(pte) &= ~SUN3_PAGE_ACCESSED; return pte; }
174 static inline pte_t pte_mkwrite(pte_t pte)	{ pte_val(pte) |= SUN3_PAGE_WRITEABLE; return pte; }
175 static inline pte_t pte_mkdirty(pte_t pte)	{ pte_val(pte) |= SUN3_PAGE_MODIFIED; return pte; }
176 static inline pte_t pte_mkyoung(pte_t pte)	{ pte_val(pte) |= SUN3_PAGE_ACCESSED; return pte; }
177 static inline pte_t pte_mknocache(pte_t pte)	{ pte_val(pte) |= SUN3_PAGE_NOCACHE; return pte; }
178 // use this version when caches work...
179 //static inline pte_t pte_mkcache(pte_t pte)	{ pte_val(pte) &= SUN3_PAGE_NOCACHE; return pte; }
180 // until then, use:
181 static inline pte_t pte_mkcache(pte_t pte)	{ return pte; }
182 static inline pte_t pte_mkspecial(pte_t pte)	{ return pte; }
183 
184 extern pgd_t swapper_pg_dir[PTRS_PER_PGD];
185 extern pgd_t kernel_pg_dir[PTRS_PER_PGD];
186 
187 /* Find an entry in a pagetable directory. */
188 #define pgd_index(address)     ((address) >> PGDIR_SHIFT)
189 
190 #define pgd_offset(mm, address) \
191 ((mm)->pgd + pgd_index(address))
192 
193 /* Find an entry in a kernel pagetable directory. */
194 #define pgd_offset_k(address) pgd_offset(&init_mm, address)
195 
196 /* Find an entry in the second-level pagetable. */
197 static inline pmd_t *pmd_offset (pgd_t *pgd, unsigned long address)
198 {
199 	return (pmd_t *) pgd;
200 }
201 
202 /* Find an entry in the third-level pagetable. */
203 #define pte_index(address) ((address >> PAGE_SHIFT) & (PTRS_PER_PTE-1))
204 #define pte_offset_kernel(pmd, address) ((pte_t *) __pmd_page(*pmd) + pte_index(address))
205 #define pte_offset_map(pmd, address) ((pte_t *)page_address(pmd_page(*pmd)) + pte_index(address))
206 #define pte_unmap(pte) do { } while (0)
207 
208 /* Macros to (de)construct the fake PTEs representing swap pages. */
209 #define __swp_type(x)		((x).val & 0x7F)
210 #define __swp_offset(x)		(((x).val) >> 7)
211 #define __swp_entry(type,offset) ((swp_entry_t) { ((type) | ((offset) << 7)) })
212 #define __pte_to_swp_entry(pte)	((swp_entry_t) { pte_val(pte) })
213 #define __swp_entry_to_pte(x)	((pte_t) { (x).val })
214 
215 #endif	/* !__ASSEMBLY__ */
216 #endif	/* !_SUN3_PGTABLE_H */
217