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sun3_pgtable.h
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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 #define PTE_FILE_MAX_BITS 28
42 
43 /* Compound page protection values. */
44 //todo: work out which ones *should* have SUN3_PAGE_NOCACHE and fix...
45 // is it just PAGE_KERNEL and PAGE_SHARED?
46 #define PAGE_NONE __pgprot(SUN3_PAGE_VALID \
47  | SUN3_PAGE_ACCESSED \
48  | SUN3_PAGE_NOCACHE)
49 #define PAGE_SHARED __pgprot(SUN3_PAGE_VALID \
50  | SUN3_PAGE_WRITEABLE \
51  | SUN3_PAGE_ACCESSED \
52  | SUN3_PAGE_NOCACHE)
53 #define PAGE_COPY __pgprot(SUN3_PAGE_VALID \
54  | SUN3_PAGE_ACCESSED \
55  | SUN3_PAGE_NOCACHE)
56 #define PAGE_READONLY __pgprot(SUN3_PAGE_VALID \
57  | SUN3_PAGE_ACCESSED \
58  | SUN3_PAGE_NOCACHE)
59 #define PAGE_KERNEL __pgprot(SUN3_PAGE_VALID \
60  | SUN3_PAGE_WRITEABLE \
61  | SUN3_PAGE_SYSTEM \
62  | SUN3_PAGE_NOCACHE \
63  | SUN3_PAGE_ACCESSED \
64  | SUN3_PAGE_MODIFIED)
65 #define PAGE_INIT __pgprot(SUN3_PAGE_VALID \
66  | SUN3_PAGE_WRITEABLE \
67  | SUN3_PAGE_SYSTEM \
68  | SUN3_PAGE_NOCACHE)
69 
70 /*
71  * Page protections for initialising protection_map. The sun3 has only two
72  * protection settings, valid (implying read and execute) and writeable. These
73  * are as close as we can get...
74  */
75 #define __P000 PAGE_NONE
76 #define __P001 PAGE_READONLY
77 #define __P010 PAGE_COPY
78 #define __P011 PAGE_COPY
79 #define __P100 PAGE_READONLY
80 #define __P101 PAGE_READONLY
81 #define __P110 PAGE_COPY
82 #define __P111 PAGE_COPY
83 
84 #define __S000 PAGE_NONE
85 #define __S001 PAGE_READONLY
86 #define __S010 PAGE_SHARED
87 #define __S011 PAGE_SHARED
88 #define __S100 PAGE_READONLY
89 #define __S101 PAGE_READONLY
90 #define __S110 PAGE_SHARED
91 #define __S111 PAGE_SHARED
92 
93 /* Use these fake page-protections on PMDs. */
94 #define SUN3_PMD_VALID (0x00000001)
95 #define SUN3_PMD_MASK (0x0000003F)
96 #define SUN3_PMD_MAGIC (0x0000002B)
97 
98 #ifndef __ASSEMBLY__
99 
100 /*
101  * Conversion functions: convert a page and protection to a page entry,
102  * and a page entry and page directory to the page they refer to.
103  */
104 #define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot))
105 
106 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
107 {
108  pte_val(pte) = (pte_val(pte) & SUN3_PAGE_CHG_MASK) | pgprot_val(newprot);
109  return pte;
110 }
111 
112 #define pmd_set(pmdp,ptep) do {} while (0)
113 
114 static inline void pgd_set(pgd_t *pgdp, pmd_t *pmdp)
115 {
116  pgd_val(*pgdp) = virt_to_phys(pmdp);
117 }
118 
119 #define __pte_page(pte) \
120 ((unsigned long) __va ((pte_val (pte) & SUN3_PAGE_PGNUM_MASK) << PAGE_SHIFT))
121 #define __pmd_page(pmd) \
122 ((unsigned long) __va (pmd_val (pmd) & PAGE_MASK))
123 
124 static inline int pte_none (pte_t pte) { return !pte_val (pte); }
125 static inline int pte_present (pte_t pte) { return pte_val (pte) & SUN3_PAGE_VALID; }
126 static inline void pte_clear (struct mm_struct *mm, unsigned long addr, pte_t *ptep)
127 {
128  pte_val (*ptep) = 0;
129 }
130 
131 #define pte_pfn(pte) (pte_val(pte) & SUN3_PAGE_PGNUM_MASK)
132 #define pfn_pte(pfn, pgprot) \
133 ({ pte_t __pte; pte_val(__pte) = pfn | pgprot_val(pgprot); __pte; })
134 
135 #define pte_page(pte) virt_to_page(__pte_page(pte))
136 #define pmd_page(pmd) virt_to_page(__pmd_page(pmd))
137 
138 
139 static inline int pmd_none2 (pmd_t *pmd) { return !pmd_val (*pmd); }
140 #define pmd_none(pmd) pmd_none2(&(pmd))
141 //static inline int pmd_bad (pmd_t pmd) { return (pmd_val (pmd) & SUN3_PMD_MASK) != SUN3_PMD_MAGIC; }
142 static inline int pmd_bad2 (pmd_t *pmd) { return 0; }
143 #define pmd_bad(pmd) pmd_bad2(&(pmd))
144 static inline int pmd_present2 (pmd_t *pmd) { return pmd_val (*pmd) & SUN3_PMD_VALID; }
145 /* #define pmd_present(pmd) pmd_present2(&(pmd)) */
146 #define pmd_present(pmd) (!pmd_none2(&(pmd)))
147 static inline void pmd_clear (pmd_t *pmdp) { pmd_val (*pmdp) = 0; }
148 
149 static inline int pgd_none (pgd_t pgd) { return 0; }
150 static inline int pgd_bad (pgd_t pgd) { return 0; }
151 static inline int pgd_present (pgd_t pgd) { return 1; }
152 static inline void pgd_clear (pgd_t *pgdp) {}
153 
154 
155 #define pte_ERROR(e) \
156  printk("%s:%d: bad pte %08lx.\n", __FILE__, __LINE__, pte_val(e))
157 #define pmd_ERROR(e) \
158  printk("%s:%d: bad pmd %08lx.\n", __FILE__, __LINE__, pmd_val(e))
159 #define pgd_ERROR(e) \
160  printk("%s:%d: bad pgd %08lx.\n", __FILE__, __LINE__, pgd_val(e))
161 
162 
163 /*
164  * The following only work if pte_present() is true.
165  * Undefined behaviour if not...
166  * [we have the full set here even if they don't change from m68k]
167  */
168 static inline int pte_write(pte_t pte) { return pte_val(pte) & SUN3_PAGE_WRITEABLE; }
169 static inline int pte_dirty(pte_t pte) { return pte_val(pte) & SUN3_PAGE_MODIFIED; }
170 static inline int pte_young(pte_t pte) { return pte_val(pte) & SUN3_PAGE_ACCESSED; }
171 static inline int pte_file(pte_t pte) { return pte_val(pte) & SUN3_PAGE_ACCESSED; }
172 static inline int pte_special(pte_t pte) { return 0; }
173 
174 static inline pte_t pte_wrprotect(pte_t pte) { pte_val(pte) &= ~SUN3_PAGE_WRITEABLE; return pte; }
175 static inline pte_t pte_mkclean(pte_t pte) { pte_val(pte) &= ~SUN3_PAGE_MODIFIED; return pte; }
176 static inline pte_t pte_mkold(pte_t pte) { pte_val(pte) &= ~SUN3_PAGE_ACCESSED; return pte; }
177 static inline pte_t pte_mkwrite(pte_t pte) { pte_val(pte) |= SUN3_PAGE_WRITEABLE; return pte; }
178 static inline pte_t pte_mkdirty(pte_t pte) { pte_val(pte) |= SUN3_PAGE_MODIFIED; return pte; }
179 static inline pte_t pte_mkyoung(pte_t pte) { pte_val(pte) |= SUN3_PAGE_ACCESSED; return pte; }
180 static inline pte_t pte_mknocache(pte_t pte) { pte_val(pte) |= SUN3_PAGE_NOCACHE; return pte; }
181 // use this version when caches work...
182 //static inline pte_t pte_mkcache(pte_t pte) { pte_val(pte) &= SUN3_PAGE_NOCACHE; return pte; }
183 // until then, use:
184 static inline pte_t pte_mkcache(pte_t pte) { return pte; }
185 static inline pte_t pte_mkspecial(pte_t pte) { return pte; }
186 
187 extern pgd_t swapper_pg_dir[PTRS_PER_PGD];
188 extern pgd_t kernel_pg_dir[PTRS_PER_PGD];
189 
190 /* Find an entry in a pagetable directory. */
191 #define pgd_index(address) ((address) >> PGDIR_SHIFT)
192 
193 #define pgd_offset(mm, address) \
194 ((mm)->pgd + pgd_index(address))
195 
196 /* Find an entry in a kernel pagetable directory. */
197 #define pgd_offset_k(address) pgd_offset(&init_mm, address)
198 
199 /* Find an entry in the second-level pagetable. */
200 static inline pmd_t *pmd_offset (pgd_t *pgd, unsigned long address)
201 {
202  return (pmd_t *) pgd;
203 }
204 
205 static inline unsigned long pte_to_pgoff(pte_t pte)
206 {
207  return pte.pte & SUN3_PAGE_PGNUM_MASK;
208 }
209 
210 static inline pte_t pgoff_to_pte(unsigned off)
211 {
212  pte_t pte = { off + SUN3_PAGE_ACCESSED };
213  return pte;
214 }
215 
216 
217 /* Find an entry in the third-level pagetable. */
218 #define pte_index(address) ((address >> PAGE_SHIFT) & (PTRS_PER_PTE-1))
219 #define pte_offset_kernel(pmd, address) ((pte_t *) __pmd_page(*pmd) + pte_index(address))
220 #define pte_offset_map(pmd, address) ((pte_t *)page_address(pmd_page(*pmd)) + pte_index(address))
221 #define pte_unmap(pte) do { } while (0)
222 
223 /* Macros to (de)construct the fake PTEs representing swap pages. */
224 #define __swp_type(x) ((x).val & 0x7F)
225 #define __swp_offset(x) (((x).val) >> 7)
226 #define __swp_entry(type,offset) ((swp_entry_t) { ((type) | ((offset) << 7)) })
227 #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) })
228 #define __swp_entry_to_pte(x) ((pte_t) { (x).val })
229 
230 #endif /* !__ASSEMBLY__ */
231 #endif /* !_SUN3_PGTABLE_H */
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