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9a8fd558 CZ |
1 | /* |
2 | * linux/include/asm-xtensa/page.h | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify | |
5 | * it under the terms of the GNU General Public License version2 as | |
6 | * published by the Free Software Foundation. | |
7 | * | |
8 | * Copyright (C) 2001 - 2005 Tensilica Inc. | |
9 | */ | |
10 | ||
11 | #ifndef _XTENSA_PGTABLE_H | |
12 | #define _XTENSA_PGTABLE_H | |
13 | ||
14 | #include <asm-generic/pgtable-nopmd.h> | |
15 | #include <asm/page.h> | |
16 | ||
17 | /* Assertions. */ | |
18 | ||
19 | #ifdef CONFIG_MMU | |
20 | ||
21 | ||
22 | #if (XCHAL_MMU_RINGS < 2) | |
23 | # error Linux build assumes at least 2 ring levels. | |
24 | #endif | |
25 | ||
26 | #if (XCHAL_MMU_CA_BITS != 4) | |
27 | # error We assume exactly four bits for CA. | |
28 | #endif | |
29 | ||
30 | #if (XCHAL_MMU_SR_BITS != 0) | |
31 | # error We have no room for SR bits. | |
32 | #endif | |
33 | ||
34 | /* | |
35 | * Use the first min-wired way for mapping page-table pages. | |
36 | * Page coloring requires a second min-wired way. | |
37 | */ | |
38 | ||
39 | #if (XCHAL_DTLB_MINWIRED_SETS == 0) | |
40 | # error Need a min-wired way for mapping page-table pages | |
41 | #endif | |
42 | ||
43 | #define DTLB_WAY_PGTABLE XCHAL_DTLB_SET(XCHAL_DTLB_MINWIRED_SET0, WAY) | |
44 | ||
45 | #if (DCACHE_WAY_SIZE > PAGE_SIZE) && XCHAL_DCACHE_IS_WRITEBACK | |
46 | # if XCHAL_DTLB_SET(XCHAL_DTLB_MINWIRED_SET0, WAYS) >= 2 | |
47 | # define DTLB_WAY_DCACHE_ALIAS0 (DTLB_WAY_PGTABLE + 1) | |
48 | # define DTLB_WAY_DCACHE_ALIAS1 (DTLB_WAY_PGTABLE + 2) | |
49 | # else | |
50 | # error Page coloring requires its own wired dtlb way! | |
51 | # endif | |
52 | #endif | |
53 | ||
54 | #endif /* CONFIG_MMU */ | |
55 | ||
56 | /* | |
57 | * We only use two ring levels, user and kernel space. | |
58 | */ | |
59 | ||
60 | #define USER_RING 1 /* user ring level */ | |
61 | #define KERNEL_RING 0 /* kernel ring level */ | |
62 | ||
63 | /* | |
64 | * The Xtensa architecture port of Linux has a two-level page table system, | |
65 | * i.e. the logical three-level Linux page table layout are folded. | |
66 | * Each task has the following memory page tables: | |
67 | * | |
68 | * PGD table (page directory), ie. 3rd-level page table: | |
69 | * One page (4 kB) of 1024 (PTRS_PER_PGD) pointers to PTE tables | |
70 | * (Architectures that don't have the PMD folded point to the PMD tables) | |
71 | * | |
72 | * The pointer to the PGD table for a given task can be retrieved from | |
73 | * the task structure (struct task_struct*) t, e.g. current(): | |
74 | * (t->mm ? t->mm : t->active_mm)->pgd | |
75 | * | |
76 | * PMD tables (page middle-directory), ie. 2nd-level page tables: | |
77 | * Absent for the Xtensa architecture (folded, PTRS_PER_PMD == 1). | |
78 | * | |
79 | * PTE tables (page table entry), ie. 1st-level page tables: | |
80 | * One page (4 kB) of 1024 (PTRS_PER_PTE) PTEs with a special PTE | |
81 | * invalid_pte_table for absent mappings. | |
82 | * | |
83 | * The individual pages are 4 kB big with special pages for the empty_zero_page. | |
84 | */ | |
85 | #define PGDIR_SHIFT 22 | |
86 | #define PGDIR_SIZE (1UL << PGDIR_SHIFT) | |
87 | #define PGDIR_MASK (~(PGDIR_SIZE-1)) | |
88 | ||
89 | /* | |
90 | * Entries per page directory level: we use two-level, so | |
91 | * we don't really have any PMD directory physically. | |
92 | */ | |
93 | #define PTRS_PER_PTE 1024 | |
94 | #define PTRS_PER_PTE_SHIFT 10 | |
95 | #define PTRS_PER_PMD 1 | |
96 | #define PTRS_PER_PGD 1024 | |
97 | #define PGD_ORDER 0 | |
98 | #define PMD_ORDER 0 | |
99 | #define USER_PTRS_PER_PGD (TASK_SIZE/PGDIR_SIZE) | |
100 | #define FIRST_USER_ADDRESS XCHAL_SEG_MAPPABLE_VADDR | |
101 | #define FIRST_USER_PGD_NR (FIRST_USER_ADDRESS >> PGDIR_SHIFT) | |
102 | ||
103 | /* virtual memory area. We keep a distance to other memory regions to be | |
104 | * on the safe side. We also use this area for cache aliasing. | |
105 | */ | |
106 | ||
107 | // FIXME: virtual memory area must be configuration-dependent | |
108 | ||
109 | #define VMALLOC_START 0xC0000000 | |
110 | #define VMALLOC_END 0xC7FF0000 | |
111 | ||
112 | /* Xtensa Linux config PTE layout (when present): | |
113 | * 31-12: PPN | |
114 | * 11-6: Software | |
115 | * 5-4: RING | |
116 | * 3-0: CA | |
117 | * | |
118 | * Similar to the Alpha and MIPS ports, we need to keep track of the ref | |
119 | * and mod bits in software. We have a software "you can read | |
120 | * from this page" bit, and a hardware one which actually lets the | |
121 | * process read from the page. On the same token we have a software | |
122 | * writable bit and the real hardware one which actually lets the | |
123 | * process write to the page. | |
124 | * | |
125 | * See further below for PTE layout for swapped-out pages. | |
126 | */ | |
127 | ||
128 | #define _PAGE_VALID (1<<0) /* hardware: page is accessible */ | |
129 | #define _PAGE_WRENABLE (1<<1) /* hardware: page is writable */ | |
130 | ||
131 | /* None of these cache modes include MP coherency: */ | |
132 | #define _PAGE_NO_CACHE (0<<2) /* bypass, non-speculative */ | |
133 | #if XCHAL_DCACHE_IS_WRITEBACK | |
134 | # define _PAGE_WRITEBACK (1<<2) /* write back */ | |
135 | # define _PAGE_WRITETHRU (2<<2) /* write through */ | |
136 | #else | |
137 | # define _PAGE_WRITEBACK (1<<2) /* assume write through */ | |
138 | # define _PAGE_WRITETHRU (1<<2) | |
139 | #endif | |
140 | #define _PAGE_NOALLOC (3<<2) /* don't allocate cache,if not cached */ | |
141 | #define _CACHE_MASK (3<<2) | |
142 | ||
143 | #define _PAGE_USER (1<<4) /* user access (ring=1) */ | |
144 | #define _PAGE_KERNEL (0<<4) /* kernel access (ring=0) */ | |
145 | ||
146 | /* Software */ | |
147 | #define _PAGE_RW (1<<6) /* software: page writable */ | |
148 | #define _PAGE_DIRTY (1<<7) /* software: page dirty */ | |
149 | #define _PAGE_ACCESSED (1<<8) /* software: page accessed (read) */ | |
150 | #define _PAGE_FILE (1<<9) /* nonlinear file mapping*/ | |
151 | ||
152 | #define _PAGE_CHG_MASK (PAGE_MASK | _PAGE_ACCESSED | _CACHE_MASK | _PAGE_DIRTY) | |
153 | #define _PAGE_PRESENT ( _PAGE_VALID | _PAGE_WRITEBACK | _PAGE_ACCESSED) | |
154 | ||
155 | #ifdef CONFIG_MMU | |
156 | ||
157 | # define PAGE_NONE __pgprot(_PAGE_PRESENT) | |
158 | # define PAGE_SHARED __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_RW) | |
159 | # define PAGE_COPY __pgprot(_PAGE_PRESENT | _PAGE_USER) | |
160 | # define PAGE_READONLY __pgprot(_PAGE_PRESENT | _PAGE_USER) | |
161 | # define PAGE_KERNEL __pgprot(_PAGE_PRESENT | _PAGE_KERNEL | _PAGE_WRENABLE) | |
162 | # define PAGE_INVALID __pgprot(_PAGE_USER) | |
163 | ||
164 | # if (DCACHE_WAY_SIZE > PAGE_SIZE) | |
165 | # define PAGE_DIRECTORY __pgprot(_PAGE_VALID | _PAGE_ACCESSED | _PAGE_KERNEL) | |
166 | # else | |
167 | # define PAGE_DIRECTORY __pgprot(_PAGE_PRESENT | _PAGE_KERNEL) | |
168 | # endif | |
169 | ||
170 | #else /* no mmu */ | |
171 | ||
172 | # define PAGE_NONE __pgprot(0) | |
173 | # define PAGE_SHARED __pgprot(0) | |
174 | # define PAGE_COPY __pgprot(0) | |
175 | # define PAGE_READONLY __pgprot(0) | |
176 | # define PAGE_KERNEL __pgprot(0) | |
177 | ||
178 | #endif | |
179 | ||
180 | /* | |
181 | * On certain configurations of Xtensa MMUs (eg. the initial Linux config), | |
182 | * the MMU can't do page protection for execute, and considers that the same as | |
183 | * read. Also, write permissions may imply read permissions. | |
184 | * What follows is the closest we can get by reasonable means.. | |
185 | * See linux/mm/mmap.c for protection_map[] array that uses these definitions. | |
186 | */ | |
187 | #define __P000 PAGE_NONE /* private --- */ | |
188 | #define __P001 PAGE_READONLY /* private --r */ | |
189 | #define __P010 PAGE_COPY /* private -w- */ | |
190 | #define __P011 PAGE_COPY /* private -wr */ | |
191 | #define __P100 PAGE_READONLY /* private x-- */ | |
192 | #define __P101 PAGE_READONLY /* private x-r */ | |
193 | #define __P110 PAGE_COPY /* private xw- */ | |
194 | #define __P111 PAGE_COPY /* private xwr */ | |
195 | ||
196 | #define __S000 PAGE_NONE /* shared --- */ | |
197 | #define __S001 PAGE_READONLY /* shared --r */ | |
198 | #define __S010 PAGE_SHARED /* shared -w- */ | |
199 | #define __S011 PAGE_SHARED /* shared -wr */ | |
200 | #define __S100 PAGE_READONLY /* shared x-- */ | |
201 | #define __S101 PAGE_READONLY /* shared x-r */ | |
202 | #define __S110 PAGE_SHARED /* shared xw- */ | |
203 | #define __S111 PAGE_SHARED /* shared xwr */ | |
204 | ||
205 | #ifndef __ASSEMBLY__ | |
206 | ||
207 | #define pte_ERROR(e) \ | |
208 | printk("%s:%d: bad pte %08lx.\n", __FILE__, __LINE__, pte_val(e)) | |
209 | #define pgd_ERROR(e) \ | |
210 | printk("%s:%d: bad pgd entry %08lx.\n", __FILE__, __LINE__, pgd_val(e)) | |
211 | ||
212 | extern unsigned long empty_zero_page[1024]; | |
213 | ||
214 | #define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page)) | |
215 | ||
216 | extern pgd_t swapper_pg_dir[PAGE_SIZE/sizeof(pgd_t)]; | |
217 | ||
218 | /* | |
219 | * The pmd contains the kernel virtual address of the pte page. | |
220 | */ | |
46a82b2d | 221 | #define pmd_page_vaddr(pmd) ((unsigned long)(pmd_val(pmd) & PAGE_MASK)) |
9a8fd558 CZ |
222 | #define pmd_page(pmd) virt_to_page(pmd_val(pmd)) |
223 | ||
224 | /* | |
225 | * The following only work if pte_present() is true. | |
226 | */ | |
227 | #define pte_none(pte) (!(pte_val(pte) ^ _PAGE_USER)) | |
228 | #define pte_present(pte) (pte_val(pte) & _PAGE_VALID) | |
229 | #define pte_clear(mm,addr,ptep) \ | |
230 | do { update_pte(ptep, __pte(_PAGE_USER)); } while(0) | |
231 | ||
232 | #define pmd_none(pmd) (!pmd_val(pmd)) | |
233 | #define pmd_present(pmd) (pmd_val(pmd) & PAGE_MASK) | |
234 | #define pmd_clear(pmdp) do { set_pmd(pmdp, __pmd(0)); } while (0) | |
235 | #define pmd_bad(pmd) (pmd_val(pmd) & ~PAGE_MASK) | |
236 | ||
237 | /* Note: We use the _PAGE_USER bit to indicate write-protect kernel memory */ | |
238 | ||
239 | static inline int pte_read(pte_t pte) { return pte_val(pte) & _PAGE_USER; } | |
240 | static inline int pte_write(pte_t pte) { return pte_val(pte) & _PAGE_RW; } | |
241 | static inline int pte_dirty(pte_t pte) { return pte_val(pte) & _PAGE_DIRTY; } | |
242 | static inline int pte_young(pte_t pte) { return pte_val(pte) & _PAGE_ACCESSED; } | |
243 | static inline int pte_file(pte_t pte) { return pte_val(pte) & _PAGE_FILE; } | |
244 | static inline pte_t pte_wrprotect(pte_t pte) { pte_val(pte) &= ~(_PAGE_RW | _PAGE_WRENABLE); return pte; } | |
245 | static inline pte_t pte_rdprotect(pte_t pte) { pte_val(pte) &= ~_PAGE_USER; return pte; } | |
246 | static inline pte_t pte_mkclean(pte_t pte) { pte_val(pte) &= ~_PAGE_DIRTY; return pte; } | |
247 | static inline pte_t pte_mkold(pte_t pte) { pte_val(pte) &= ~_PAGE_ACCESSED; return pte; } | |
248 | static inline pte_t pte_mkread(pte_t pte) { pte_val(pte) |= _PAGE_USER; return pte; } | |
249 | static inline pte_t pte_mkdirty(pte_t pte) { pte_val(pte) |= _PAGE_DIRTY; return pte; } | |
250 | static inline pte_t pte_mkyoung(pte_t pte) { pte_val(pte) |= _PAGE_ACCESSED; return pte; } | |
251 | static inline pte_t pte_mkwrite(pte_t pte) { pte_val(pte) |= _PAGE_RW; return pte; } | |
252 | ||
253 | /* | |
254 | * Conversion functions: convert a page and protection to a page entry, | |
255 | * and a page entry and page directory to the page they refer to. | |
256 | */ | |
257 | #define pte_pfn(pte) (pte_val(pte) >> PAGE_SHIFT) | |
258 | #define pte_same(a,b) (pte_val(a) == pte_val(b)) | |
259 | #define pte_page(x) pfn_to_page(pte_pfn(x)) | |
260 | #define pfn_pte(pfn, prot) __pte(((pfn) << PAGE_SHIFT) | pgprot_val(prot)) | |
261 | #define mk_pte(page, prot) pfn_pte(page_to_pfn(page), prot) | |
262 | ||
d99cf715 | 263 | static inline pte_t pte_modify(pte_t pte, pgprot_t newprot) |
9a8fd558 CZ |
264 | { |
265 | return __pte((pte_val(pte) & _PAGE_CHG_MASK) | pgprot_val(newprot)); | |
266 | } | |
267 | ||
268 | /* | |
269 | * Certain architectures need to do special things when pte's | |
270 | * within a page table are directly modified. Thus, the following | |
271 | * hook is made available. | |
272 | */ | |
273 | static inline void update_pte(pte_t *ptep, pte_t pteval) | |
274 | { | |
275 | *ptep = pteval; | |
276 | #if (DCACHE_WAY_SIZE > PAGE_SIZE) && XCHAL_DCACHE_IS_WRITEBACK | |
277 | __asm__ __volatile__ ("memw; dhwb %0, 0; dsync" :: "a" (ptep)); | |
278 | #endif | |
279 | } | |
280 | ||
8c65b4a6 TS |
281 | struct mm_struct; |
282 | ||
d99cf715 | 283 | static inline void |
9a8fd558 CZ |
284 | set_pte_at(struct mm_struct *mm, unsigned long addr, pte_t *ptep, pte_t pteval) |
285 | { | |
286 | update_pte(ptep, pteval); | |
287 | } | |
288 | ||
289 | ||
d99cf715 | 290 | static inline void |
9a8fd558 CZ |
291 | set_pmd(pmd_t *pmdp, pmd_t pmdval) |
292 | { | |
293 | *pmdp = pmdval; | |
294 | #if (DCACHE_WAY_SIZE > PAGE_SIZE) && XCHAL_DCACHE_IS_WRITEBACK | |
295 | __asm__ __volatile__ ("memw; dhwb %0, 0; dsync" :: "a" (pmdp)); | |
296 | #endif | |
297 | } | |
298 | ||
8c65b4a6 | 299 | struct vm_area_struct; |
9a8fd558 CZ |
300 | |
301 | static inline int | |
302 | ptep_test_and_clear_young(struct vm_area_struct *vma, unsigned long addr, | |
303 | pte_t *ptep) | |
304 | { | |
305 | pte_t pte = *ptep; | |
306 | if (!pte_young(pte)) | |
307 | return 0; | |
308 | update_pte(ptep, pte_mkold(pte)); | |
309 | return 1; | |
310 | } | |
311 | ||
312 | static inline int | |
313 | ptep_test_and_clear_dirty(struct vm_area_struct *vma, unsigned long addr, | |
314 | pte_t *ptep) | |
315 | { | |
316 | pte_t pte = *ptep; | |
317 | if (!pte_dirty(pte)) | |
318 | return 0; | |
319 | update_pte(ptep, pte_mkclean(pte)); | |
320 | return 1; | |
321 | } | |
322 | ||
323 | static inline pte_t | |
324 | ptep_get_and_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep) | |
325 | { | |
326 | pte_t pte = *ptep; | |
327 | pte_clear(mm, addr, ptep); | |
328 | return pte; | |
329 | } | |
330 | ||
331 | static inline void | |
332 | ptep_set_wrprotect(struct mm_struct *mm, unsigned long addr, pte_t *ptep) | |
333 | { | |
334 | pte_t pte = *ptep; | |
335 | update_pte(ptep, pte_wrprotect(pte)); | |
336 | } | |
337 | ||
338 | /* to find an entry in a kernel page-table-directory */ | |
339 | #define pgd_offset_k(address) pgd_offset(&init_mm, address) | |
340 | ||
341 | /* to find an entry in a page-table-directory */ | |
342 | #define pgd_offset(mm,address) ((mm)->pgd + pgd_index(address)) | |
343 | ||
344 | #define pgd_index(address) ((address) >> PGDIR_SHIFT) | |
345 | ||
346 | /* Find an entry in the second-level page table.. */ | |
347 | #define pmd_offset(dir,address) ((pmd_t*)(dir)) | |
348 | ||
349 | /* Find an entry in the third-level page table.. */ | |
350 | #define pte_index(address) (((address) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1)) | |
351 | #define pte_offset_kernel(dir,addr) \ | |
46a82b2d | 352 | ((pte_t*) pmd_page_vaddr(*(dir)) + pte_index(addr)) |
9a8fd558 CZ |
353 | #define pte_offset_map(dir,addr) pte_offset_kernel((dir),(addr)) |
354 | #define pte_offset_map_nested(dir,addr) pte_offset_kernel((dir),(addr)) | |
355 | ||
356 | #define pte_unmap(pte) do { } while (0) | |
357 | #define pte_unmap_nested(pte) do { } while (0) | |
358 | ||
359 | ||
360 | /* | |
361 | * Encode and decode a swap entry. | |
362 | * Each PTE in a process VM's page table is either: | |
363 | * "present" -- valid and not swapped out, protection bits are meaningful; | |
364 | * "not present" -- which further subdivides in these two cases: | |
365 | * "none" -- no mapping at all; identified by pte_none(), set by pte_clear( | |
366 | * "swapped out" -- the page is swapped out, and the SWP macros below | |
367 | * are used to store swap file info in the PTE itself. | |
368 | * | |
369 | * In the Xtensa processor MMU, any PTE entries in user space (or anywhere | |
370 | * in virtual memory that can map differently across address spaces) | |
371 | * must have a correct ring value that represents the RASID field that | |
372 | * is changed when switching address spaces. Eg. such PTE entries cannot | |
373 | * be set to ring zero, because that can cause a (global) kernel ASID | |
374 | * entry to be created in the TLBs (even with invalid cache attribute), | |
375 | * potentially causing a multihit exception when going back to another | |
376 | * address space that mapped the same virtual address at another ring. | |
377 | * | |
378 | * SO: we avoid using ring bits (_PAGE_RING_MASK) in "not present" PTEs. | |
379 | * We also avoid using the _PAGE_VALID bit which must be zero for non-present | |
380 | * pages. | |
381 | * | |
382 | * We end up with the following available bits: 1..3 and 7..31. | |
383 | * We don't bother with 1..3 for now (we can use them later if needed), | |
384 | * and chose to allocate 6 bits for SWP_TYPE and the remaining 19 bits | |
385 | * for SWP_OFFSET. At least 5 bits are needed for SWP_TYPE, because it | |
386 | * is currently implemented as an index into swap_info[MAX_SWAPFILES] | |
387 | * and MAX_SWAPFILES is currently defined as 32 in <linux/swap.h>. | |
388 | * However, for some reason all other architectures in the 2.4 kernel | |
389 | * reserve either 6, 7, or 8 bits so I'll not detract from that for now. :) | |
390 | * SWP_OFFSET is an offset into the swap file in page-size units, so | |
391 | * with 4 kB pages, 19 bits supports a maximum swap file size of 2 GB. | |
392 | * | |
393 | * FIXME: 2 GB isn't very big. Other bits can be used to allow | |
394 | * larger swap sizes. In the meantime, it appears relatively easy to get | |
395 | * around the 2 GB limitation by simply using multiple swap files. | |
396 | */ | |
397 | ||
398 | #define __swp_type(entry) (((entry).val >> 7) & 0x3f) | |
399 | #define __swp_offset(entry) ((entry).val >> 13) | |
400 | #define __swp_entry(type,offs) ((swp_entry_t) {((type) << 7) | ((offs) << 13)}) | |
401 | #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) }) | |
402 | #define __swp_entry_to_pte(x) ((pte_t) { (x).val }) | |
403 | ||
404 | #define PTE_FILE_MAX_BITS 29 | |
405 | #define pte_to_pgoff(pte) (pte_val(pte) >> 3) | |
406 | #define pgoff_to_pte(off) ((pte_t) { ((off) << 3) | _PAGE_FILE }) | |
407 | ||
408 | ||
409 | #endif /* !defined (__ASSEMBLY__) */ | |
410 | ||
411 | ||
412 | #ifdef __ASSEMBLY__ | |
413 | ||
414 | /* Assembly macro _PGD_INDEX is the same as C pgd_index(unsigned long), | |
415 | * _PGD_OFFSET as C pgd_offset(struct mm_struct*, unsigned long), | |
416 | * _PMD_OFFSET as C pmd_offset(pgd_t*, unsigned long) | |
417 | * _PTE_OFFSET as C pte_offset(pmd_t*, unsigned long) | |
418 | * | |
419 | * Note: We require an additional temporary register which can be the same as | |
420 | * the register that holds the address. | |
421 | * | |
422 | * ((pte_t*) ((unsigned long)(pmd_val(*pmd) & PAGE_MASK)) + pte_index(addr)) | |
423 | * | |
424 | */ | |
425 | #define _PGD_INDEX(rt,rs) extui rt, rs, PGDIR_SHIFT, 32-PGDIR_SHIFT | |
426 | #define _PTE_INDEX(rt,rs) extui rt, rs, PAGE_SHIFT, PTRS_PER_PTE_SHIFT | |
427 | ||
428 | #define _PGD_OFFSET(mm,adr,tmp) l32i mm, mm, MM_PGD; \ | |
429 | _PGD_INDEX(tmp, adr); \ | |
430 | addx4 mm, tmp, mm | |
431 | ||
432 | #define _PTE_OFFSET(pmd,adr,tmp) _PTE_INDEX(tmp, adr); \ | |
433 | srli pmd, pmd, PAGE_SHIFT; \ | |
434 | slli pmd, pmd, PAGE_SHIFT; \ | |
435 | addx4 pmd, tmp, pmd | |
436 | ||
437 | #else | |
438 | ||
439 | extern void paging_init(void); | |
440 | ||
441 | #define kern_addr_valid(addr) (1) | |
442 | ||
443 | extern void update_mmu_cache(struct vm_area_struct * vma, | |
444 | unsigned long address, pte_t pte); | |
445 | ||
446 | /* | |
33bf5610 | 447 | * remap a physical page `pfn' of size `size' with page protection `prot' |
9a8fd558 CZ |
448 | * into virtual address `from' |
449 | */ | |
33bf5610 RD |
450 | #define io_remap_pfn_range(vma,from,pfn,size,prot) \ |
451 | remap_pfn_range(vma, from, pfn, size, prot) | |
9a8fd558 CZ |
452 | |
453 | ||
454 | /* No page table caches to init */ | |
455 | ||
456 | #define pgtable_cache_init() do { } while (0) | |
457 | ||
458 | typedef pte_t *pte_addr_t; | |
459 | ||
460 | #endif /* !defined (__ASSEMBLY__) */ | |
461 | ||
462 | #define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG | |
463 | #define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_DIRTY | |
464 | #define __HAVE_ARCH_PTEP_GET_AND_CLEAR | |
465 | #define __HAVE_ARCH_PTEP_SET_WRPROTECT | |
466 | #define __HAVE_ARCH_PTEP_MKDIRTY | |
467 | #define __HAVE_ARCH_PTE_SAME | |
468 | ||
469 | #include <asm-generic/pgtable.h> | |
470 | ||
471 | #endif /* _XTENSA_PGTABLE_H */ |