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