1 /* SPDX-License-Identifier: GPL-2.0 */
2
3 #ifndef __ASM_CSKY_PGTABLE_H
4 #define __ASM_CSKY_PGTABLE_H
5
6 #include <asm/fixmap.h>
7 #include <asm/memory.h>
8 #include <asm/addrspace.h>
9 #include <abi/pgtable-bits.h>
10 #include <asm-generic/pgtable-nopmd.h>
11
12 #define PGDIR_SHIFT 22
13 #define PGDIR_SIZE (1UL << PGDIR_SHIFT)
14 #define PGDIR_MASK (~(PGDIR_SIZE-1))
15
16 #define USER_PTRS_PER_PGD (PAGE_OFFSET/PGDIR_SIZE)
17 #define FIRST_USER_ADDRESS 0UL
18
19 /*
20 * C-SKY is two-level paging structure:
21 */
22 #define PGD_ORDER 0
23 #define PTE_ORDER 0
24
25 #define PTRS_PER_PGD ((PAGE_SIZE << PGD_ORDER) / sizeof(pgd_t))
26 #define PTRS_PER_PMD 1
27 #define PTRS_PER_PTE ((PAGE_SIZE << PTE_ORDER) / sizeof(pte_t))
28
29 #define pte_ERROR(e) \
30 pr_err("%s:%d: bad pte %08lx.\n", __FILE__, __LINE__, (e).pte_low)
31 #define pgd_ERROR(e) \
32 pr_err("%s:%d: bad pgd %08lx.\n", __FILE__, __LINE__, pgd_val(e))
33
34 #define pmd_page(pmd) (pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT))
35 #define pte_clear(mm, addr, ptep) set_pte((ptep), \
36 (((unsigned int) addr >= PAGE_OFFSET) ? __pte(_PAGE_GLOBAL) : __pte(0)))
37 #define pte_none(pte) (!(pte_val(pte) & ~_PAGE_GLOBAL))
38 #define pte_present(pte) (pte_val(pte) & _PAGE_PRESENT)
39 #define pte_pfn(x) ((unsigned long)((x).pte_low >> PAGE_SHIFT))
40 #define pfn_pte(pfn, prot) __pte(((unsigned long long)(pfn) << PAGE_SHIFT) \
41 | pgprot_val(prot))
42
43 #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) })
44 #define __swp_entry_to_pte(x) ((pte_t) { (x).val })
45
46 #define pte_page(x) pfn_to_page(pte_pfn(x))
47 #define __mk_pte(page_nr, pgprot) __pte(((page_nr) << PAGE_SHIFT) | \
48 pgprot_val(pgprot))
49
50 /*
51 * C-SKY only has VALID and DIRTY bit in hardware. So we need to use the
52 * two bits emulate PRESENT, READ, WRITE, EXEC, MODIFIED, ACCESSED.
53 */
54 #define _PAGE_BASE (_PAGE_PRESENT | _PAGE_ACCESSED)
55
56 #define PAGE_NONE __pgprot(_PAGE_PROT_NONE)
57 #define PAGE_READ __pgprot(_PAGE_BASE | _PAGE_READ | \
58 _CACHE_CACHED)
59 #define PAGE_WRITE __pgprot(_PAGE_BASE | _PAGE_READ | _PAGE_WRITE | \
60 _CACHE_CACHED)
61 #define PAGE_SHARED PAGE_WRITE
62
63 #define PAGE_KERNEL __pgprot(_PAGE_BASE | _PAGE_READ | _PAGE_VALID | \
64 _PAGE_WRITE | _PAGE_DIRTY | _PAGE_MODIFIED | \
65 _PAGE_GLOBAL | \
66 _CACHE_CACHED)
67
68 #define _PAGE_IOREMAP (_PAGE_BASE | _PAGE_READ | _PAGE_VALID | \
69 _PAGE_WRITE | _PAGE_DIRTY | _PAGE_MODIFIED | \
70 _PAGE_GLOBAL | \
71 _CACHE_UNCACHED | _PAGE_SO)
72
73 #define _PAGE_CHG_MASK (~(unsigned long) \
74 (_PAGE_PRESENT | _PAGE_READ | _PAGE_WRITE | \
75 _CACHE_MASK | _PAGE_GLOBAL))
76
77 #define MAX_SWAPFILES_CHECK() \
78 BUILD_BUG_ON(MAX_SWAPFILES_SHIFT != 5)
79
80 #define __P000 PAGE_NONE
81 #define __P001 PAGE_READ
82 #define __P010 PAGE_READ
83 #define __P011 PAGE_READ
84 #define __P100 PAGE_READ
85 #define __P101 PAGE_READ
86 #define __P110 PAGE_READ
87 #define __P111 PAGE_READ
88
89 #define __S000 PAGE_NONE
90 #define __S001 PAGE_READ
91 #define __S010 PAGE_WRITE
92 #define __S011 PAGE_WRITE
93 #define __S100 PAGE_READ
94 #define __S101 PAGE_READ
95 #define __S110 PAGE_WRITE
96 #define __S111 PAGE_WRITE
97
98 extern unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)];
99 #define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page))
100
101 extern void load_pgd(unsigned long pg_dir);
102 extern pte_t invalid_pte_table[PTRS_PER_PTE];
103
set_pte(pte_t * p,pte_t pte)104 static inline void set_pte(pte_t *p, pte_t pte)
105 {
106 *p = pte;
107 #if defined(CONFIG_CPU_NEED_TLBSYNC)
108 dcache_wb_line((u32)p);
109 #endif
110 /* prevent out of order excution */
111 smp_mb();
112 }
113 #define set_pte_at(mm, addr, ptep, pteval) set_pte(ptep, pteval)
114
pmd_page_vaddr(pmd_t pmd)115 static inline pte_t *pmd_page_vaddr(pmd_t pmd)
116 {
117 unsigned long ptr;
118
119 ptr = pmd_val(pmd);
120
121 return __va(ptr);
122 }
123
124 #define pmd_phys(pmd) pmd_val(pmd)
125
set_pmd(pmd_t * p,pmd_t pmd)126 static inline void set_pmd(pmd_t *p, pmd_t pmd)
127 {
128 *p = pmd;
129 #if defined(CONFIG_CPU_NEED_TLBSYNC)
130 dcache_wb_line((u32)p);
131 #endif
132 /* prevent specul excute */
133 smp_mb();
134 }
135
136
pmd_none(pmd_t pmd)137 static inline int pmd_none(pmd_t pmd)
138 {
139 return pmd_val(pmd) == __pa(invalid_pte_table);
140 }
141
142 #define pmd_bad(pmd) (pmd_val(pmd) & ~PAGE_MASK)
143
pmd_present(pmd_t pmd)144 static inline int pmd_present(pmd_t pmd)
145 {
146 return (pmd_val(pmd) != __pa(invalid_pte_table));
147 }
148
pmd_clear(pmd_t * p)149 static inline void pmd_clear(pmd_t *p)
150 {
151 pmd_val(*p) = (__pa(invalid_pte_table));
152 #if defined(CONFIG_CPU_NEED_TLBSYNC)
153 dcache_wb_line((u32)p);
154 #endif
155 }
156
157 /*
158 * The following only work if pte_present() is true.
159 * Undefined behaviour if not..
160 */
pte_read(pte_t pte)161 static inline int pte_read(pte_t pte)
162 {
163 return pte.pte_low & _PAGE_READ;
164 }
165
pte_write(pte_t pte)166 static inline int pte_write(pte_t pte)
167 {
168 return (pte).pte_low & _PAGE_WRITE;
169 }
170
pte_dirty(pte_t pte)171 static inline int pte_dirty(pte_t pte)
172 {
173 return (pte).pte_low & _PAGE_MODIFIED;
174 }
175
pte_young(pte_t pte)176 static inline int pte_young(pte_t pte)
177 {
178 return (pte).pte_low & _PAGE_ACCESSED;
179 }
180
pte_wrprotect(pte_t pte)181 static inline pte_t pte_wrprotect(pte_t pte)
182 {
183 pte_val(pte) &= ~(_PAGE_WRITE | _PAGE_DIRTY);
184 return pte;
185 }
186
pte_mkclean(pte_t pte)187 static inline pte_t pte_mkclean(pte_t pte)
188 {
189 pte_val(pte) &= ~(_PAGE_MODIFIED|_PAGE_DIRTY);
190 return pte;
191 }
192
pte_mkold(pte_t pte)193 static inline pte_t pte_mkold(pte_t pte)
194 {
195 pte_val(pte) &= ~(_PAGE_ACCESSED|_PAGE_VALID);
196 return pte;
197 }
198
pte_mkwrite(pte_t pte)199 static inline pte_t pte_mkwrite(pte_t pte)
200 {
201 pte_val(pte) |= _PAGE_WRITE;
202 if (pte_val(pte) & _PAGE_MODIFIED)
203 pte_val(pte) |= _PAGE_DIRTY;
204 return pte;
205 }
206
pte_mkdirty(pte_t pte)207 static inline pte_t pte_mkdirty(pte_t pte)
208 {
209 pte_val(pte) |= _PAGE_MODIFIED;
210 if (pte_val(pte) & _PAGE_WRITE)
211 pte_val(pte) |= _PAGE_DIRTY;
212 return pte;
213 }
214
pte_mkyoung(pte_t pte)215 static inline pte_t pte_mkyoung(pte_t pte)
216 {
217 pte_val(pte) |= _PAGE_ACCESSED;
218 if (pte_val(pte) & _PAGE_READ)
219 pte_val(pte) |= _PAGE_VALID;
220 return pte;
221 }
222
223 #define __HAVE_PHYS_MEM_ACCESS_PROT
224 struct file;
225 extern pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,
226 unsigned long size, pgprot_t vma_prot);
227
228 /*
229 * Macro to make mark a page protection value as "uncacheable". Note
230 * that "protection" is really a misnomer here as the protection value
231 * contains the memory attribute bits, dirty bits, and various other
232 * bits as well.
233 */
234 #define pgprot_noncached pgprot_noncached
235
pgprot_noncached(pgprot_t _prot)236 static inline pgprot_t pgprot_noncached(pgprot_t _prot)
237 {
238 unsigned long prot = pgprot_val(_prot);
239
240 prot = (prot & ~_CACHE_MASK) | _CACHE_UNCACHED | _PAGE_SO;
241
242 return __pgprot(prot);
243 }
244
245 #define pgprot_writecombine pgprot_writecombine
pgprot_writecombine(pgprot_t _prot)246 static inline pgprot_t pgprot_writecombine(pgprot_t _prot)
247 {
248 unsigned long prot = pgprot_val(_prot);
249
250 prot = (prot & ~_CACHE_MASK) | _CACHE_UNCACHED;
251
252 return __pgprot(prot);
253 }
254
255 /*
256 * Conversion functions: convert a page and protection to a page entry,
257 * and a page entry and page directory to the page they refer to.
258 */
259 #define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot))
pte_modify(pte_t pte,pgprot_t newprot)260 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
261 {
262 return __pte((pte_val(pte) & _PAGE_CHG_MASK) |
263 (pgprot_val(newprot)));
264 }
265
266 extern pgd_t swapper_pg_dir[PTRS_PER_PGD];
267 extern void paging_init(void);
268
269 void update_mmu_cache(struct vm_area_struct *vma, unsigned long address,
270 pte_t *pte);
271
272 /* Needs to be defined here and not in linux/mm.h, as it is arch dependent */
273 #define kern_addr_valid(addr) (1)
274
275 #define io_remap_pfn_range(vma, vaddr, pfn, size, prot) \
276 remap_pfn_range(vma, vaddr, pfn, size, prot)
277
278 #endif /* __ASM_CSKY_PGTABLE_H */
279