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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
105static 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
113static 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
123static inline int pte_none (pte_t pte) { return !pte_val (pte); }
124static inline int pte_present (pte_t pte) { return pte_val (pte) & SUN3_PAGE_VALID; }
125static 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
138static 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; }
141static inline int pmd_bad2 (pmd_t *pmd) { return 0; }
142#define pmd_bad(pmd) pmd_bad2(&(pmd))
143static 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)))
146static inline void pmd_clear (pmd_t *pmdp) { pmd_val (*pmdp) = 0; }
147
148static inline int pgd_none (pgd_t pgd) { return 0; }
149static inline int pgd_bad (pgd_t pgd) { return 0; }
150static inline int pgd_present (pgd_t pgd) { return 1; }
151static 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 */
167static inline int pte_write(pte_t pte) { return pte_val(pte) & SUN3_PAGE_WRITEABLE; }
168static inline int pte_dirty(pte_t pte) { return pte_val(pte) & SUN3_PAGE_MODIFIED; }
169static inline int pte_young(pte_t pte) { return pte_val(pte) & SUN3_PAGE_ACCESSED; }
170static inline int pte_special(pte_t pte) { return 0; }
171
172static inline pte_t pte_wrprotect(pte_t pte) { pte_val(pte) &= ~SUN3_PAGE_WRITEABLE; return pte; }
173static inline pte_t pte_mkclean(pte_t pte) { pte_val(pte) &= ~SUN3_PAGE_MODIFIED; return pte; }
174static inline pte_t pte_mkold(pte_t pte) { pte_val(pte) &= ~SUN3_PAGE_ACCESSED; return pte; }
175static inline pte_t pte_mkwrite(pte_t pte) { pte_val(pte) |= SUN3_PAGE_WRITEABLE; return pte; }
176static inline pte_t pte_mkdirty(pte_t pte) { pte_val(pte) |= SUN3_PAGE_MODIFIED; return pte; }
177static inline pte_t pte_mkyoung(pte_t pte) { pte_val(pte) |= SUN3_PAGE_ACCESSED; return pte; }
178static 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:
182static inline pte_t pte_mkcache(pte_t pte) { return pte; }
183static inline pte_t pte_mkspecial(pte_t pte) { return pte; }
184
185extern pgd_t swapper_pg_dir[PTRS_PER_PGD];
186extern 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. */
198static 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 */