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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
1da177e4 LT |
2 | #ifndef _ASM_M32R_PGTABLE_H |
3 | #define _ASM_M32R_PGTABLE_H | |
4 | ||
5 | #include <asm-generic/4level-fixup.h> | |
6 | ||
7 | #ifdef __KERNEL__ | |
8 | /* | |
9 | * The Linux memory management assumes a three-level page table setup. On | |
10 | * the M32R, we use that, but "fold" the mid level into the top-level page | |
11 | * table, so that we physically have the same two-level page table as the | |
12 | * M32R mmu expects. | |
13 | * | |
14 | * This file contains the functions and defines necessary to modify and use | |
15 | * the M32R page table tree. | |
16 | */ | |
17 | ||
18 | /* CAUTION!: If you change macro definitions in this file, you might have to | |
19 | * change arch/m32r/mmu.S manually. | |
20 | */ | |
21 | ||
22 | #ifndef __ASSEMBLY__ | |
23 | ||
1da177e4 | 24 | #include <linux/threads.h> |
1977f032 | 25 | #include <linux/bitops.h> |
1da177e4 LT |
26 | #include <asm/processor.h> |
27 | #include <asm/addrspace.h> | |
1da177e4 LT |
28 | #include <asm/page.h> |
29 | ||
8c65b4a6 TS |
30 | struct mm_struct; |
31 | struct vm_area_struct; | |
32 | ||
1da177e4 LT |
33 | extern pgd_t swapper_pg_dir[1024]; |
34 | extern void paging_init(void); | |
35 | ||
36 | /* | |
37 | * ZERO_PAGE is a global shared page that is always zero: used | |
38 | * for zero-mapped memory areas etc.. | |
39 | */ | |
40 | extern unsigned long empty_zero_page[1024]; | |
41 | #define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page)) | |
42 | ||
43 | #endif /* !__ASSEMBLY__ */ | |
44 | ||
45 | #ifndef __ASSEMBLY__ | |
46 | #include <asm/pgtable-2level.h> | |
47 | #endif | |
48 | ||
49 | #define pgtable_cache_init() do { } while (0) | |
50 | ||
51 | #define PMD_SIZE (1UL << PMD_SHIFT) | |
52 | #define PMD_MASK (~(PMD_SIZE - 1)) | |
53 | #define PGDIR_SIZE (1UL << PGDIR_SHIFT) | |
54 | #define PGDIR_MASK (~(PGDIR_SIZE - 1)) | |
55 | ||
56 | #define USER_PTRS_PER_PGD (TASK_SIZE / PGDIR_SIZE) | |
d016bf7e | 57 | #define FIRST_USER_ADDRESS 0UL |
1da177e4 LT |
58 | |
59 | #ifndef __ASSEMBLY__ | |
60 | /* Just any arbitrary offset to the start of the vmalloc VM area: the | |
61 | * current 8MB value just means that there will be a 8MB "hole" after the | |
62 | * physical memory until the kernel virtual memory starts. That means that | |
63 | * any out-of-bounds memory accesses will hopefully be caught. | |
64 | * The vmalloc() routines leaves a hole of 4kB between each vmalloced | |
65 | * area for the same reason. ;) | |
66 | */ | |
67 | #define VMALLOC_START KSEG2 | |
68 | #define VMALLOC_END KSEG3 | |
69 | ||
70 | /* | |
71 | * M32R TLB format | |
72 | * | |
73 | * [0] [1:19] [20:23] [24:31] | |
74 | * +-----------------------+----+-------------+ | |
75 | * | VPN |0000| ASID | | |
76 | * +-----------------------+----+-------------+ | |
77 | * +-+---------------------+----+-+---+-+-+-+-+ | |
78 | * |0 PPN |0000|N|AC |L|G|V| | | |
79 | * +-+---------------------+----+-+---+-+-+-+-+ | |
80 | * RWX | |
81 | */ | |
82 | ||
83 | #define _PAGE_BIT_DIRTY 0 /* software: page changed */ | |
1da177e4 LT |
84 | #define _PAGE_BIT_PRESENT 1 /* Valid: page is valid */ |
85 | #define _PAGE_BIT_GLOBAL 2 /* Global */ | |
86 | #define _PAGE_BIT_LARGE 3 /* Large */ | |
87 | #define _PAGE_BIT_EXEC 4 /* Execute */ | |
88 | #define _PAGE_BIT_WRITE 5 /* Write */ | |
89 | #define _PAGE_BIT_READ 6 /* Read */ | |
90 | #define _PAGE_BIT_NONCACHABLE 7 /* Non cachable */ | |
91 | #define _PAGE_BIT_ACCESSED 8 /* software: page referenced */ | |
92 | #define _PAGE_BIT_PROTNONE 9 /* software: if not present */ | |
93 | ||
94 | #define _PAGE_DIRTY (1UL << _PAGE_BIT_DIRTY) | |
1da177e4 LT |
95 | #define _PAGE_PRESENT (1UL << _PAGE_BIT_PRESENT) |
96 | #define _PAGE_GLOBAL (1UL << _PAGE_BIT_GLOBAL) | |
97 | #define _PAGE_LARGE (1UL << _PAGE_BIT_LARGE) | |
98 | #define _PAGE_EXEC (1UL << _PAGE_BIT_EXEC) | |
99 | #define _PAGE_WRITE (1UL << _PAGE_BIT_WRITE) | |
100 | #define _PAGE_READ (1UL << _PAGE_BIT_READ) | |
101 | #define _PAGE_NONCACHABLE (1UL << _PAGE_BIT_NONCACHABLE) | |
102 | #define _PAGE_ACCESSED (1UL << _PAGE_BIT_ACCESSED) | |
103 | #define _PAGE_PROTNONE (1UL << _PAGE_BIT_PROTNONE) | |
104 | ||
105 | #define _PAGE_TABLE \ | |
106 | ( _PAGE_PRESENT | _PAGE_WRITE | _PAGE_READ | _PAGE_ACCESSED \ | |
107 | | _PAGE_DIRTY ) | |
108 | #define _KERNPG_TABLE \ | |
109 | ( _PAGE_PRESENT | _PAGE_WRITE | _PAGE_READ | _PAGE_ACCESSED \ | |
110 | | _PAGE_DIRTY ) | |
111 | #define _PAGE_CHG_MASK \ | |
112 | ( PTE_MASK | _PAGE_ACCESSED | _PAGE_DIRTY ) | |
113 | ||
114 | #ifdef CONFIG_MMU | |
115 | #define PAGE_NONE \ | |
116 | __pgprot(_PAGE_PROTNONE | _PAGE_ACCESSED) | |
117 | #define PAGE_SHARED \ | |
118 | __pgprot(_PAGE_PRESENT | _PAGE_WRITE | _PAGE_READ | _PAGE_ACCESSED) | |
119 | #define PAGE_SHARED_EXEC \ | |
120 | __pgprot(_PAGE_PRESENT | _PAGE_EXEC | _PAGE_WRITE | _PAGE_READ \ | |
121 | | _PAGE_ACCESSED) | |
122 | #define PAGE_COPY \ | |
123 | __pgprot(_PAGE_PRESENT | _PAGE_READ | _PAGE_ACCESSED) | |
124 | #define PAGE_COPY_EXEC \ | |
125 | __pgprot(_PAGE_PRESENT | _PAGE_EXEC | _PAGE_READ | _PAGE_ACCESSED) | |
126 | #define PAGE_READONLY \ | |
127 | __pgprot(_PAGE_PRESENT | _PAGE_READ | _PAGE_ACCESSED) | |
128 | #define PAGE_READONLY_EXEC \ | |
129 | __pgprot(_PAGE_PRESENT | _PAGE_EXEC | _PAGE_READ | _PAGE_ACCESSED) | |
130 | ||
131 | #define __PAGE_KERNEL \ | |
132 | ( _PAGE_PRESENT | _PAGE_EXEC | _PAGE_WRITE | _PAGE_READ | _PAGE_DIRTY \ | |
133 | | _PAGE_ACCESSED ) | |
134 | #define __PAGE_KERNEL_RO ( __PAGE_KERNEL & ~_PAGE_WRITE ) | |
135 | #define __PAGE_KERNEL_NOCACHE ( __PAGE_KERNEL | _PAGE_NONCACHABLE) | |
136 | ||
137 | #define MAKE_GLOBAL(x) __pgprot((x) | _PAGE_GLOBAL) | |
138 | ||
139 | #define PAGE_KERNEL MAKE_GLOBAL(__PAGE_KERNEL) | |
140 | #define PAGE_KERNEL_RO MAKE_GLOBAL(__PAGE_KERNEL_RO) | |
141 | #define PAGE_KERNEL_NOCACHE MAKE_GLOBAL(__PAGE_KERNEL_NOCACHE) | |
142 | ||
143 | #else | |
144 | #define PAGE_NONE __pgprot(0) | |
145 | #define PAGE_SHARED __pgprot(0) | |
146 | #define PAGE_SHARED_EXEC __pgprot(0) | |
147 | #define PAGE_COPY __pgprot(0) | |
148 | #define PAGE_COPY_EXEC __pgprot(0) | |
149 | #define PAGE_READONLY __pgprot(0) | |
150 | #define PAGE_READONLY_EXEC __pgprot(0) | |
151 | ||
152 | #define PAGE_KERNEL __pgprot(0) | |
153 | #define PAGE_KERNEL_RO __pgprot(0) | |
154 | #define PAGE_KERNEL_NOCACHE __pgprot(0) | |
155 | #endif /* CONFIG_MMU */ | |
156 | ||
157 | /* xwr */ | |
158 | #define __P000 PAGE_NONE | |
159 | #define __P001 PAGE_READONLY | |
160 | #define __P010 PAGE_COPY | |
161 | #define __P011 PAGE_COPY | |
162 | #define __P100 PAGE_READONLY_EXEC | |
163 | #define __P101 PAGE_READONLY_EXEC | |
164 | #define __P110 PAGE_COPY_EXEC | |
165 | #define __P111 PAGE_COPY_EXEC | |
166 | ||
167 | #define __S000 PAGE_NONE | |
168 | #define __S001 PAGE_READONLY | |
169 | #define __S010 PAGE_SHARED | |
170 | #define __S011 PAGE_SHARED | |
171 | #define __S100 PAGE_READONLY_EXEC | |
172 | #define __S101 PAGE_READONLY_EXEC | |
173 | #define __S110 PAGE_SHARED_EXEC | |
174 | #define __S111 PAGE_SHARED_EXEC | |
175 | ||
176 | /* page table for 0-4MB for everybody */ | |
177 | ||
178 | #define pte_present(x) (pte_val(x) & (_PAGE_PRESENT | _PAGE_PROTNONE)) | |
179 | #define pte_clear(mm,addr,xp) do { set_pte_at(mm, addr, xp, __pte(0)); } while (0) | |
180 | ||
181 | #define pmd_none(x) (!pmd_val(x)) | |
182 | #define pmd_present(x) (pmd_val(x) & _PAGE_PRESENT) | |
183 | #define pmd_clear(xp) do { set_pmd(xp, __pmd(0)); } while (0) | |
184 | #define pmd_bad(x) ((pmd_val(x) & ~PAGE_MASK) != _KERNPG_TABLE) | |
185 | ||
186 | #define pages_to_mb(x) ((x) >> (20 - PAGE_SHIFT)) | |
187 | ||
188 | /* | |
189 | * The following only work if pte_present() is true. | |
190 | * Undefined behaviour if not.. | |
191 | */ | |
1da177e4 LT |
192 | static inline int pte_dirty(pte_t pte) |
193 | { | |
194 | return pte_val(pte) & _PAGE_DIRTY; | |
195 | } | |
196 | ||
197 | static inline int pte_young(pte_t pte) | |
198 | { | |
199 | return pte_val(pte) & _PAGE_ACCESSED; | |
200 | } | |
201 | ||
202 | static inline int pte_write(pte_t pte) | |
203 | { | |
204 | return pte_val(pte) & _PAGE_WRITE; | |
205 | } | |
206 | ||
7e675137 NP |
207 | static inline int pte_special(pte_t pte) |
208 | { | |
209 | return 0; | |
210 | } | |
211 | ||
1da177e4 LT |
212 | static inline pte_t pte_mkclean(pte_t pte) |
213 | { | |
214 | pte_val(pte) &= ~_PAGE_DIRTY; | |
215 | return pte; | |
216 | } | |
217 | ||
218 | static inline pte_t pte_mkold(pte_t pte) | |
219 | { | |
220 | pte_val(pte) &= ~_PAGE_ACCESSED; | |
221 | return pte; | |
222 | } | |
223 | ||
224 | static inline pte_t pte_wrprotect(pte_t pte) | |
225 | { | |
226 | pte_val(pte) &= ~_PAGE_WRITE; | |
227 | return pte; | |
228 | } | |
229 | ||
1da177e4 LT |
230 | static inline pte_t pte_mkdirty(pte_t pte) |
231 | { | |
232 | pte_val(pte) |= _PAGE_DIRTY; | |
233 | return pte; | |
234 | } | |
235 | ||
236 | static inline pte_t pte_mkyoung(pte_t pte) | |
237 | { | |
238 | pte_val(pte) |= _PAGE_ACCESSED; | |
239 | return pte; | |
240 | } | |
241 | ||
242 | static inline pte_t pte_mkwrite(pte_t pte) | |
243 | { | |
244 | pte_val(pte) |= _PAGE_WRITE; | |
245 | return pte; | |
246 | } | |
247 | ||
7e675137 NP |
248 | static inline pte_t pte_mkspecial(pte_t pte) |
249 | { | |
250 | return pte; | |
251 | } | |
252 | ||
1da177e4 LT |
253 | static inline int ptep_test_and_clear_young(struct vm_area_struct *vma, unsigned long addr, pte_t *ptep) |
254 | { | |
255 | return test_and_clear_bit(_PAGE_BIT_ACCESSED, ptep); | |
256 | } | |
257 | ||
258 | static inline void ptep_set_wrprotect(struct mm_struct *mm, unsigned long addr, pte_t *ptep) | |
259 | { | |
260 | clear_bit(_PAGE_BIT_WRITE, ptep); | |
261 | } | |
262 | ||
263 | /* | |
264 | * Macro and implementation to make a page protection as uncachable. | |
265 | */ | |
266 | static inline pgprot_t pgprot_noncached(pgprot_t _prot) | |
267 | { | |
268 | unsigned long prot = pgprot_val(_prot); | |
269 | ||
270 | prot |= _PAGE_NONCACHABLE; | |
271 | return __pgprot(prot); | |
272 | } | |
273 | ||
274 | #define pgprot_writecombine(prot) pgprot_noncached(prot) | |
275 | ||
276 | /* | |
277 | * Conversion functions: convert a page and protection to a page entry, | |
278 | * and a page entry and page directory to the page they refer to. | |
279 | */ | |
280 | #define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), pgprot) | |
281 | ||
282 | static inline pte_t pte_modify(pte_t pte, pgprot_t newprot) | |
283 | { | |
284 | set_pte(&pte, __pte((pte_val(pte) & _PAGE_CHG_MASK) \ | |
285 | | pgprot_val(newprot))); | |
286 | ||
287 | return pte; | |
288 | } | |
289 | ||
1da177e4 LT |
290 | /* |
291 | * Conversion functions: convert a page and protection to a page entry, | |
292 | * and a page entry and page directory to the page they refer to. | |
293 | */ | |
294 | ||
295 | static inline void pmd_set(pmd_t * pmdp, pte_t * ptep) | |
296 | { | |
297 | pmd_val(*pmdp) = (((unsigned long) ptep) & PAGE_MASK); | |
298 | } | |
299 | ||
46a82b2d | 300 | #define pmd_page_vaddr(pmd) \ |
1da177e4 LT |
301 | ((unsigned long) __va(pmd_val(pmd) & PAGE_MASK)) |
302 | ||
303 | #ifndef CONFIG_DISCONTIGMEM | |
304 | #define pmd_page(pmd) (mem_map + ((pmd_val(pmd) >> PAGE_SHIFT) - PFN_BASE)) | |
305 | #endif /* !CONFIG_DISCONTIGMEM */ | |
306 | ||
307 | /* to find an entry in a page-table-directory. */ | |
308 | #define pgd_index(address) \ | |
309 | (((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD - 1)) | |
310 | ||
311 | #define pgd_offset(mm, address) ((mm)->pgd + pgd_index(address)) | |
312 | ||
313 | /* to find an entry in a kernel page-table-directory */ | |
314 | #define pgd_offset_k(address) pgd_offset(&init_mm, address) | |
315 | ||
316 | #define pmd_index(address) \ | |
317 | (((address) >> PMD_SHIFT) & (PTRS_PER_PMD - 1)) | |
318 | ||
319 | #define pte_index(address) \ | |
320 | (((address) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1)) | |
321 | #define pte_offset_kernel(dir, address) \ | |
46a82b2d | 322 | ((pte_t *)pmd_page_vaddr(*(dir)) + pte_index(address)) |
1da177e4 LT |
323 | #define pte_offset_map(dir, address) \ |
324 | ((pte_t *)page_address(pmd_page(*(dir))) + pte_index(address)) | |
1da177e4 | 325 | #define pte_unmap(pte) do { } while (0) |
1da177e4 LT |
326 | |
327 | /* Encode and de-code a swap entry */ | |
23c9bbba | 328 | #define __swp_type(x) (((x).val >> 2) & 0x1f) |
1da177e4 LT |
329 | #define __swp_offset(x) ((x).val >> 10) |
330 | #define __swp_entry(type, offset) \ | |
331 | ((swp_entry_t) { ((type) << 2) | ((offset) << 10) }) | |
332 | #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) }) | |
333 | #define __swp_entry_to_pte(x) ((pte_t) { (x).val }) | |
334 | ||
335 | #endif /* !__ASSEMBLY__ */ | |
336 | ||
337 | /* Needs to be defined here and not in linux/mm.h, as it is arch dependent */ | |
338 | #define kern_addr_valid(addr) (1) | |
339 | ||
1da177e4 | 340 | #define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG |
1da177e4 LT |
341 | #define __HAVE_ARCH_PTEP_GET_AND_CLEAR |
342 | #define __HAVE_ARCH_PTEP_SET_WRPROTECT | |
343 | #define __HAVE_ARCH_PTE_SAME | |
344 | #include <asm-generic/pgtable.h> | |
345 | ||
346 | #endif /* __KERNEL__ */ | |
347 | ||
348 | #endif /* _ASM_M32R_PGTABLE_H */ |