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-rw-r--r--include/asm-m68k/sun3_pgtable.h238
1 files changed, 238 insertions, 0 deletions
diff --git a/include/asm-m68k/sun3_pgtable.h b/include/asm-m68k/sun3_pgtable.h
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index 000000000000..e974bb072047
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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
106static 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
114static 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
124static inline int pte_none (pte_t pte) { return !pte_val (pte); }
125static inline int pte_present (pte_t pte) { return pte_val (pte) & SUN3_PAGE_VALID; }
126static 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) (mem_map+((__pte_page(pte) - PAGE_OFFSET) >> PAGE_SHIFT))
136#define pmd_page(pmd) (mem_map+((__pmd_page(pmd) - PAGE_OFFSET) >> PAGE_SHIFT))
137
138
139static 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; }
142static inline int pmd_bad2 (pmd_t *pmd) { return 0; }
143#define pmd_bad(pmd) pmd_bad2(&(pmd))
144static 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)))
147static inline void pmd_clear (pmd_t *pmdp) { pmd_val (*pmdp) = 0; }
148
149static inline int pgd_none (pgd_t pgd) { return 0; }
150static inline int pgd_bad (pgd_t pgd) { return 0; }
151static inline int pgd_present (pgd_t pgd) { return 1; }
152static 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 */
168static inline int pte_read(pte_t pte) { return 1; }
169static inline int pte_write(pte_t pte) { return pte_val(pte) & SUN3_PAGE_WRITEABLE; }
170static inline int pte_exec(pte_t pte) { return 1; }
171static inline int pte_dirty(pte_t pte) { return pte_val(pte) & SUN3_PAGE_MODIFIED; }
172static inline int pte_young(pte_t pte) { return pte_val(pte) & SUN3_PAGE_ACCESSED; }
173static inline int pte_file(pte_t pte) { return pte_val(pte) & SUN3_PAGE_ACCESSED; }
174
175static inline pte_t pte_wrprotect(pte_t pte) { pte_val(pte) &= ~SUN3_PAGE_WRITEABLE; return pte; }
176static inline pte_t pte_rdprotect(pte_t pte) { return pte; }
177static inline pte_t pte_exprotect(pte_t pte) { return pte; }
178static inline pte_t pte_mkclean(pte_t pte) { pte_val(pte) &= ~SUN3_PAGE_MODIFIED; return pte; }
179static inline pte_t pte_mkold(pte_t pte) { pte_val(pte) &= ~SUN3_PAGE_ACCESSED; return pte; }
180static inline pte_t pte_mkwrite(pte_t pte) { pte_val(pte) |= SUN3_PAGE_WRITEABLE; return pte; }
181static inline pte_t pte_mkread(pte_t pte) { return pte; }
182static inline pte_t pte_mkexec(pte_t pte) { return pte; }
183static inline pte_t pte_mkdirty(pte_t pte) { pte_val(pte) |= SUN3_PAGE_MODIFIED; return pte; }
184static inline pte_t pte_mkyoung(pte_t pte) { pte_val(pte) |= SUN3_PAGE_ACCESSED; return pte; }
185static inline pte_t pte_mknocache(pte_t pte) { pte_val(pte) |= SUN3_PAGE_NOCACHE; return pte; }
186// use this version when caches work...
187//static inline pte_t pte_mkcache(pte_t pte) { pte_val(pte) &= SUN3_PAGE_NOCACHE; return pte; }
188// until then, use:
189static inline pte_t pte_mkcache(pte_t pte) { return pte; }
190
191extern pgd_t swapper_pg_dir[PTRS_PER_PGD];
192extern pgd_t kernel_pg_dir[PTRS_PER_PGD];
193
194/* Find an entry in a pagetable directory. */
195#define pgd_index(address) ((address) >> PGDIR_SHIFT)
196
197#define pgd_offset(mm, address) \
198((mm)->pgd + pgd_index(address))
199
200/* Find an entry in a kernel pagetable directory. */
201#define pgd_offset_k(address) pgd_offset(&init_mm, address)
202
203/* Find an entry in the second-level pagetable. */
204static inline pmd_t *pmd_offset (pgd_t *pgd, unsigned long address)
205{
206 return (pmd_t *) pgd;
207}
208
209static inline unsigned long pte_to_pgoff(pte_t pte)
210{
211 return pte.pte & SUN3_PAGE_PGNUM_MASK;
212}
213
214static inline pte_t pgoff_to_pte(inline unsigned off)
215{
216 pte_t pte = { off + SUN3_PAGE_ACCESSED };
217 return pte;
218}
219
220
221/* Find an entry in the third-level pagetable. */
222#define pte_index(address) ((address >> PAGE_SHIFT) & (PTRS_PER_PTE-1))
223#define pte_offset_kernel(pmd, address) ((pte_t *) __pmd_page(*pmd) + pte_index(address))
224/* FIXME: should we bother with kmap() here? */
225#define pte_offset_map(pmd, address) ((pte_t *)kmap(pmd_page(*pmd)) + pte_index(address))
226#define pte_offset_map_nested(pmd, address) pte_offset_map(pmd, address)
227#define pte_unmap(pte) kunmap(pte)
228#define pte_unmap_nested(pte) kunmap(pte)
229
230/* Macros to (de)construct the fake PTEs representing swap pages. */
231#define __swp_type(x) ((x).val & 0x7F)
232#define __swp_offset(x) (((x).val) >> 7)
233#define __swp_entry(type,offset) ((swp_entry_t) { ((type) | ((offset) << 7)) })
234#define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) })
235#define __swp_entry_to_pte(x) ((pte_t) { (x).val })
236
237#endif /* !__ASSEMBLY__ */
238#endif /* !_SUN3_PGTABLE_H */
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