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