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1 | #ifndef __ASM_SH_PGTABLE_32_H |
2 | #define __ASM_SH_PGTABLE_32_H | |
3 | ||
4 | /* | |
5 | * Linux PTEL encoding. | |
6 | * | |
7 | * Hardware and software bit definitions for the PTEL value (see below for | |
8 | * notes on SH-X2 MMUs and 64-bit PTEs): | |
9 | * | |
10 | * - Bits 0 and 7 are reserved on SH-3 (_PAGE_WT and _PAGE_SZ1 on SH-4). | |
11 | * | |
12 | * - Bit 1 is the SH-bit, but is unused on SH-3 due to an MMU bug (the | |
13 | * hardware PTEL value can't have the SH-bit set when MMUCR.IX is set, | |
14 | * which is the default in cpu-sh3/mmu_context.h:MMU_CONTROL_INIT). | |
15 | * | |
16 | * In order to keep this relatively clean, do not use these for defining | |
17 | * SH-3 specific flags until all of the other unused bits have been | |
18 | * exhausted. | |
19 | * | |
20 | * - Bit 9 is reserved by everyone and used by _PAGE_PROTNONE. | |
21 | * | |
22 | * - Bits 10 and 11 are low bits of the PPN that are reserved on >= 4K pages. | |
23 | * Bit 10 is used for _PAGE_ACCESSED, bit 11 remains unused. | |
24 | * | |
25 | * - Bits 31, 30, and 29 remain unused by everyone and can be used for future | |
26 | * software flags, although care must be taken to update _PAGE_CLEAR_FLAGS. | |
27 | * | |
28 | * XXX: Leave the _PAGE_FILE and _PAGE_WT overhaul for a rainy day. | |
29 | * | |
30 | * SH-X2 MMUs and extended PTEs | |
31 | * | |
32 | * SH-X2 supports an extended mode TLB with split data arrays due to the | |
33 | * number of bits needed for PR and SZ (now EPR and ESZ) encodings. The PR and | |
34 | * SZ bit placeholders still exist in data array 1, but are implemented as | |
35 | * reserved bits, with the real logic existing in data array 2. | |
36 | * | |
37 | * The downside to this is that we can no longer fit everything in to a 32-bit | |
38 | * PTE encoding, so a 64-bit pte_t is necessary for these parts. On the plus | |
39 | * side, this gives us quite a few spare bits to play with for future usage. | |
40 | */ | |
41 | /* Legacy and compat mode bits */ | |
42 | #define _PAGE_WT 0x001 /* WT-bit on SH-4, 0 on SH-3 */ | |
43 | #define _PAGE_HW_SHARED 0x002 /* SH-bit : shared among processes */ | |
44 | #define _PAGE_DIRTY 0x004 /* D-bit : page changed */ | |
45 | #define _PAGE_CACHABLE 0x008 /* C-bit : cachable */ | |
46 | #define _PAGE_SZ0 0x010 /* SZ0-bit : Size of page */ | |
47 | #define _PAGE_RW 0x020 /* PR0-bit : write access allowed */ | |
48 | #define _PAGE_USER 0x040 /* PR1-bit : user space access allowed*/ | |
49 | #define _PAGE_SZ1 0x080 /* SZ1-bit : Size of page (on SH-4) */ | |
50 | #define _PAGE_PRESENT 0x100 /* V-bit : page is valid */ | |
51 | #define _PAGE_PROTNONE 0x200 /* software: if not present */ | |
52 | #define _PAGE_ACCESSED 0x400 /* software: page referenced */ | |
53 | #define _PAGE_FILE _PAGE_WT /* software: pagecache or swap? */ | |
54 | ||
55 | #define _PAGE_SZ_MASK (_PAGE_SZ0 | _PAGE_SZ1) | |
56 | #define _PAGE_PR_MASK (_PAGE_RW | _PAGE_USER) | |
57 | ||
58 | /* Extended mode bits */ | |
59 | #define _PAGE_EXT_ESZ0 0x0010 /* ESZ0-bit: Size of page */ | |
60 | #define _PAGE_EXT_ESZ1 0x0020 /* ESZ1-bit: Size of page */ | |
61 | #define _PAGE_EXT_ESZ2 0x0040 /* ESZ2-bit: Size of page */ | |
62 | #define _PAGE_EXT_ESZ3 0x0080 /* ESZ3-bit: Size of page */ | |
63 | ||
64 | #define _PAGE_EXT_USER_EXEC 0x0100 /* EPR0-bit: User space executable */ | |
65 | #define _PAGE_EXT_USER_WRITE 0x0200 /* EPR1-bit: User space writable */ | |
66 | #define _PAGE_EXT_USER_READ 0x0400 /* EPR2-bit: User space readable */ | |
67 | ||
68 | #define _PAGE_EXT_KERN_EXEC 0x0800 /* EPR3-bit: Kernel space executable */ | |
69 | #define _PAGE_EXT_KERN_WRITE 0x1000 /* EPR4-bit: Kernel space writable */ | |
70 | #define _PAGE_EXT_KERN_READ 0x2000 /* EPR5-bit: Kernel space readable */ | |
71 | ||
72 | /* Wrapper for extended mode pgprot twiddling */ | |
73 | #define _PAGE_EXT(x) ((unsigned long long)(x) << 32) | |
74 | ||
75 | /* software: moves to PTEA.TC (Timing Control) */ | |
76 | #define _PAGE_PCC_AREA5 0x00000000 /* use BSC registers for area5 */ | |
77 | #define _PAGE_PCC_AREA6 0x80000000 /* use BSC registers for area6 */ | |
78 | ||
79 | /* software: moves to PTEA.SA[2:0] (Space Attributes) */ | |
80 | #define _PAGE_PCC_IODYN 0x00000001 /* IO space, dynamically sized bus */ | |
81 | #define _PAGE_PCC_IO8 0x20000000 /* IO space, 8 bit bus */ | |
82 | #define _PAGE_PCC_IO16 0x20000001 /* IO space, 16 bit bus */ | |
83 | #define _PAGE_PCC_COM8 0x40000000 /* Common Memory space, 8 bit bus */ | |
84 | #define _PAGE_PCC_COM16 0x40000001 /* Common Memory space, 16 bit bus */ | |
85 | #define _PAGE_PCC_ATR8 0x60000000 /* Attribute Memory space, 8 bit bus */ | |
86 | #define _PAGE_PCC_ATR16 0x60000001 /* Attribute Memory space, 6 bit bus */ | |
87 | ||
88 | /* Mask which drops unused bits from the PTEL value */ | |
89 | #if defined(CONFIG_CPU_SH3) | |
90 | #define _PAGE_CLEAR_FLAGS (_PAGE_PROTNONE | _PAGE_ACCESSED| \ | |
91 | _PAGE_FILE | _PAGE_SZ1 | \ | |
92 | _PAGE_HW_SHARED) | |
93 | #elif defined(CONFIG_X2TLB) | |
94 | /* Get rid of the legacy PR/SZ bits when using extended mode */ | |
95 | #define _PAGE_CLEAR_FLAGS (_PAGE_PROTNONE | _PAGE_ACCESSED | \ | |
96 | _PAGE_FILE | _PAGE_PR_MASK | _PAGE_SZ_MASK) | |
97 | #else | |
98 | #define _PAGE_CLEAR_FLAGS (_PAGE_PROTNONE | _PAGE_ACCESSED | _PAGE_FILE) | |
99 | #endif | |
100 | ||
d02b08f6 | 101 | #define _PAGE_FLAGS_HARDWARE_MASK (PHYS_ADDR_MASK & ~(_PAGE_CLEAR_FLAGS)) |
249cfea9 PM |
102 | |
103 | /* Hardware flags, page size encoding */ | |
104 | #if defined(CONFIG_X2TLB) | |
105 | # if defined(CONFIG_PAGE_SIZE_4KB) | |
106 | # define _PAGE_FLAGS_HARD _PAGE_EXT(_PAGE_EXT_ESZ0) | |
107 | # elif defined(CONFIG_PAGE_SIZE_8KB) | |
108 | # define _PAGE_FLAGS_HARD _PAGE_EXT(_PAGE_EXT_ESZ1) | |
109 | # elif defined(CONFIG_PAGE_SIZE_64KB) | |
110 | # define _PAGE_FLAGS_HARD _PAGE_EXT(_PAGE_EXT_ESZ2) | |
111 | # endif | |
112 | #else | |
113 | # if defined(CONFIG_PAGE_SIZE_4KB) | |
114 | # define _PAGE_FLAGS_HARD _PAGE_SZ0 | |
115 | # elif defined(CONFIG_PAGE_SIZE_64KB) | |
116 | # define _PAGE_FLAGS_HARD _PAGE_SZ1 | |
117 | # endif | |
118 | #endif | |
119 | ||
120 | #if defined(CONFIG_X2TLB) | |
121 | # if defined(CONFIG_HUGETLB_PAGE_SIZE_64K) | |
122 | # define _PAGE_SZHUGE (_PAGE_EXT_ESZ2) | |
123 | # elif defined(CONFIG_HUGETLB_PAGE_SIZE_256K) | |
124 | # define _PAGE_SZHUGE (_PAGE_EXT_ESZ0 | _PAGE_EXT_ESZ2) | |
125 | # elif defined(CONFIG_HUGETLB_PAGE_SIZE_1MB) | |
126 | # define _PAGE_SZHUGE (_PAGE_EXT_ESZ0 | _PAGE_EXT_ESZ1 | _PAGE_EXT_ESZ2) | |
127 | # elif defined(CONFIG_HUGETLB_PAGE_SIZE_4MB) | |
128 | # define _PAGE_SZHUGE (_PAGE_EXT_ESZ3) | |
129 | # elif defined(CONFIG_HUGETLB_PAGE_SIZE_64MB) | |
130 | # define _PAGE_SZHUGE (_PAGE_EXT_ESZ2 | _PAGE_EXT_ESZ3) | |
131 | # endif | |
132 | #else | |
133 | # if defined(CONFIG_HUGETLB_PAGE_SIZE_64K) | |
134 | # define _PAGE_SZHUGE (_PAGE_SZ1) | |
135 | # elif defined(CONFIG_HUGETLB_PAGE_SIZE_1MB) | |
136 | # define _PAGE_SZHUGE (_PAGE_SZ0 | _PAGE_SZ1) | |
137 | # endif | |
138 | #endif | |
139 | ||
140 | /* | |
141 | * Stub out _PAGE_SZHUGE if we don't have a good definition for it, | |
142 | * to make pte_mkhuge() happy. | |
143 | */ | |
144 | #ifndef _PAGE_SZHUGE | |
145 | # define _PAGE_SZHUGE (_PAGE_FLAGS_HARD) | |
146 | #endif | |
147 | ||
148 | #define _PAGE_CHG_MASK \ | |
149 | (PTE_MASK | _PAGE_ACCESSED | _PAGE_CACHABLE | _PAGE_DIRTY) | |
150 | ||
151 | #ifndef __ASSEMBLY__ | |
152 | ||
153 | #if defined(CONFIG_X2TLB) /* SH-X2 TLB */ | |
154 | #define PAGE_NONE __pgprot(_PAGE_PROTNONE | _PAGE_CACHABLE | \ | |
155 | _PAGE_ACCESSED | _PAGE_FLAGS_HARD) | |
156 | ||
157 | #define PAGE_SHARED __pgprot(_PAGE_PRESENT | _PAGE_ACCESSED | \ | |
158 | _PAGE_CACHABLE | _PAGE_FLAGS_HARD | \ | |
159 | _PAGE_EXT(_PAGE_EXT_KERN_READ | \ | |
160 | _PAGE_EXT_KERN_WRITE | \ | |
161 | _PAGE_EXT_USER_READ | \ | |
162 | _PAGE_EXT_USER_WRITE)) | |
163 | ||
164 | #define PAGE_EXECREAD __pgprot(_PAGE_PRESENT | _PAGE_ACCESSED | \ | |
165 | _PAGE_CACHABLE | _PAGE_FLAGS_HARD | \ | |
166 | _PAGE_EXT(_PAGE_EXT_KERN_EXEC | \ | |
167 | _PAGE_EXT_KERN_READ | \ | |
168 | _PAGE_EXT_USER_EXEC | \ | |
169 | _PAGE_EXT_USER_READ)) | |
170 | ||
171 | #define PAGE_COPY PAGE_EXECREAD | |
172 | ||
173 | #define PAGE_READONLY __pgprot(_PAGE_PRESENT | _PAGE_ACCESSED | \ | |
174 | _PAGE_CACHABLE | _PAGE_FLAGS_HARD | \ | |
175 | _PAGE_EXT(_PAGE_EXT_KERN_READ | \ | |
176 | _PAGE_EXT_USER_READ)) | |
177 | ||
178 | #define PAGE_WRITEONLY __pgprot(_PAGE_PRESENT | _PAGE_ACCESSED | \ | |
179 | _PAGE_CACHABLE | _PAGE_FLAGS_HARD | \ | |
180 | _PAGE_EXT(_PAGE_EXT_KERN_WRITE | \ | |
181 | _PAGE_EXT_USER_WRITE)) | |
182 | ||
183 | #define PAGE_RWX __pgprot(_PAGE_PRESENT | _PAGE_ACCESSED | \ | |
184 | _PAGE_CACHABLE | _PAGE_FLAGS_HARD | \ | |
185 | _PAGE_EXT(_PAGE_EXT_KERN_WRITE | \ | |
186 | _PAGE_EXT_KERN_READ | \ | |
187 | _PAGE_EXT_KERN_EXEC | \ | |
188 | _PAGE_EXT_USER_WRITE | \ | |
189 | _PAGE_EXT_USER_READ | \ | |
190 | _PAGE_EXT_USER_EXEC)) | |
191 | ||
192 | #define PAGE_KERNEL __pgprot(_PAGE_PRESENT | _PAGE_CACHABLE | \ | |
193 | _PAGE_DIRTY | _PAGE_ACCESSED | \ | |
194 | _PAGE_HW_SHARED | _PAGE_FLAGS_HARD | \ | |
195 | _PAGE_EXT(_PAGE_EXT_KERN_READ | \ | |
196 | _PAGE_EXT_KERN_WRITE | \ | |
197 | _PAGE_EXT_KERN_EXEC)) | |
198 | ||
199 | #define PAGE_KERNEL_NOCACHE \ | |
200 | __pgprot(_PAGE_PRESENT | _PAGE_DIRTY | \ | |
201 | _PAGE_ACCESSED | _PAGE_HW_SHARED | \ | |
202 | _PAGE_FLAGS_HARD | \ | |
203 | _PAGE_EXT(_PAGE_EXT_KERN_READ | \ | |
204 | _PAGE_EXT_KERN_WRITE | \ | |
205 | _PAGE_EXT_KERN_EXEC)) | |
206 | ||
207 | #define PAGE_KERNEL_RO __pgprot(_PAGE_PRESENT | _PAGE_CACHABLE | \ | |
208 | _PAGE_DIRTY | _PAGE_ACCESSED | \ | |
209 | _PAGE_HW_SHARED | _PAGE_FLAGS_HARD | \ | |
210 | _PAGE_EXT(_PAGE_EXT_KERN_READ | \ | |
211 | _PAGE_EXT_KERN_EXEC)) | |
212 | ||
213 | #define PAGE_KERNEL_PCC(slot, type) \ | |
214 | __pgprot(_PAGE_PRESENT | _PAGE_DIRTY | \ | |
215 | _PAGE_ACCESSED | _PAGE_FLAGS_HARD | \ | |
216 | _PAGE_EXT(_PAGE_EXT_KERN_READ | \ | |
217 | _PAGE_EXT_KERN_WRITE | \ | |
218 | _PAGE_EXT_KERN_EXEC) \ | |
219 | (slot ? _PAGE_PCC_AREA5 : _PAGE_PCC_AREA6) | \ | |
220 | (type)) | |
221 | ||
222 | #elif defined(CONFIG_MMU) /* SH-X TLB */ | |
223 | #define PAGE_NONE __pgprot(_PAGE_PROTNONE | _PAGE_CACHABLE | \ | |
224 | _PAGE_ACCESSED | _PAGE_FLAGS_HARD) | |
225 | ||
226 | #define PAGE_SHARED __pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_USER | \ | |
227 | _PAGE_CACHABLE | _PAGE_ACCESSED | \ | |
228 | _PAGE_FLAGS_HARD) | |
229 | ||
230 | #define PAGE_COPY __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_CACHABLE | \ | |
231 | _PAGE_ACCESSED | _PAGE_FLAGS_HARD) | |
232 | ||
233 | #define PAGE_READONLY __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_CACHABLE | \ | |
234 | _PAGE_ACCESSED | _PAGE_FLAGS_HARD) | |
235 | ||
236 | #define PAGE_EXECREAD PAGE_READONLY | |
237 | #define PAGE_RWX PAGE_SHARED | |
238 | #define PAGE_WRITEONLY PAGE_SHARED | |
239 | ||
240 | #define PAGE_KERNEL __pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_CACHABLE | \ | |
241 | _PAGE_DIRTY | _PAGE_ACCESSED | \ | |
242 | _PAGE_HW_SHARED | _PAGE_FLAGS_HARD) | |
243 | ||
244 | #define PAGE_KERNEL_NOCACHE \ | |
245 | __pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_DIRTY | \ | |
246 | _PAGE_ACCESSED | _PAGE_HW_SHARED | \ | |
247 | _PAGE_FLAGS_HARD) | |
248 | ||
249 | #define PAGE_KERNEL_RO __pgprot(_PAGE_PRESENT | _PAGE_CACHABLE | \ | |
250 | _PAGE_DIRTY | _PAGE_ACCESSED | \ | |
251 | _PAGE_HW_SHARED | _PAGE_FLAGS_HARD) | |
252 | ||
253 | #define PAGE_KERNEL_PCC(slot, type) \ | |
254 | __pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_DIRTY | \ | |
255 | _PAGE_ACCESSED | _PAGE_FLAGS_HARD | \ | |
256 | (slot ? _PAGE_PCC_AREA5 : _PAGE_PCC_AREA6) | \ | |
257 | (type)) | |
258 | #else /* no mmu */ | |
259 | #define PAGE_NONE __pgprot(0) | |
260 | #define PAGE_SHARED __pgprot(0) | |
261 | #define PAGE_COPY __pgprot(0) | |
262 | #define PAGE_EXECREAD __pgprot(0) | |
263 | #define PAGE_RWX __pgprot(0) | |
264 | #define PAGE_READONLY __pgprot(0) | |
265 | #define PAGE_WRITEONLY __pgprot(0) | |
266 | #define PAGE_KERNEL __pgprot(0) | |
267 | #define PAGE_KERNEL_NOCACHE __pgprot(0) | |
268 | #define PAGE_KERNEL_RO __pgprot(0) | |
269 | ||
270 | #define PAGE_KERNEL_PCC(slot, type) \ | |
271 | __pgprot(0) | |
272 | #endif | |
273 | ||
274 | #endif /* __ASSEMBLY__ */ | |
275 | ||
276 | #ifndef __ASSEMBLY__ | |
277 | ||
278 | /* | |
279 | * Certain architectures need to do special things when PTEs | |
280 | * within a page table are directly modified. Thus, the following | |
281 | * hook is made available. | |
282 | */ | |
283 | #ifdef CONFIG_X2TLB | |
284 | static inline void set_pte(pte_t *ptep, pte_t pte) | |
285 | { | |
286 | ptep->pte_high = pte.pte_high; | |
287 | smp_wmb(); | |
288 | ptep->pte_low = pte.pte_low; | |
289 | } | |
290 | #else | |
291 | #define set_pte(pteptr, pteval) (*(pteptr) = pteval) | |
292 | #endif | |
293 | ||
294 | #define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval) | |
295 | ||
296 | /* | |
297 | * (pmds are folded into pgds so this doesn't get actually called, | |
298 | * but the define is needed for a generic inline function.) | |
299 | */ | |
300 | #define set_pmd(pmdptr, pmdval) (*(pmdptr) = pmdval) | |
301 | ||
302 | #define pfn_pte(pfn, prot) \ | |
303 | __pte(((unsigned long long)(pfn) << PAGE_SHIFT) | pgprot_val(prot)) | |
304 | #define pfn_pmd(pfn, prot) \ | |
305 | __pmd(((unsigned long long)(pfn) << PAGE_SHIFT) | pgprot_val(prot)) | |
306 | ||
307 | #define pte_none(x) (!pte_val(x)) | |
308 | #define pte_present(x) ((x).pte_low & (_PAGE_PRESENT | _PAGE_PROTNONE)) | |
309 | ||
310 | #define pte_clear(mm,addr,xp) do { set_pte_at(mm, addr, xp, __pte(0)); } while (0) | |
311 | ||
312 | #define pmd_none(x) (!pmd_val(x)) | |
313 | #define pmd_present(x) (pmd_val(x)) | |
314 | #define pmd_clear(xp) do { set_pmd(xp, __pmd(0)); } while (0) | |
315 | #define pmd_bad(x) (pmd_val(x) & ~PAGE_MASK) | |
316 | ||
317 | #define pages_to_mb(x) ((x) >> (20-PAGE_SHIFT)) | |
318 | #define pte_page(x) pfn_to_page(pte_pfn(x)) | |
319 | ||
320 | /* | |
321 | * The following only work if pte_present() is true. | |
322 | * Undefined behaviour if not.. | |
323 | */ | |
324 | #define pte_not_present(pte) (!((pte).pte_low & _PAGE_PRESENT)) | |
325 | #define pte_dirty(pte) ((pte).pte_low & _PAGE_DIRTY) | |
326 | #define pte_young(pte) ((pte).pte_low & _PAGE_ACCESSED) | |
327 | #define pte_file(pte) ((pte).pte_low & _PAGE_FILE) | |
328 | ||
329 | #ifdef CONFIG_X2TLB | |
330 | #define pte_write(pte) ((pte).pte_high & _PAGE_EXT_USER_WRITE) | |
331 | #else | |
332 | #define pte_write(pte) ((pte).pte_low & _PAGE_RW) | |
333 | #endif | |
334 | ||
335 | #define PTE_BIT_FUNC(h,fn,op) \ | |
336 | static inline pte_t pte_##fn(pte_t pte) { pte.pte_##h op; return pte; } | |
337 | ||
338 | #ifdef CONFIG_X2TLB | |
339 | /* | |
340 | * We cheat a bit in the SH-X2 TLB case. As the permission bits are | |
341 | * individually toggled (and user permissions are entirely decoupled from | |
342 | * kernel permissions), we attempt to couple them a bit more sanely here. | |
343 | */ | |
344 | PTE_BIT_FUNC(high, wrprotect, &= ~_PAGE_EXT_USER_WRITE); | |
345 | PTE_BIT_FUNC(high, mkwrite, |= _PAGE_EXT_USER_WRITE | _PAGE_EXT_KERN_WRITE); | |
346 | PTE_BIT_FUNC(high, mkhuge, |= _PAGE_SZHUGE); | |
347 | #else | |
348 | PTE_BIT_FUNC(low, wrprotect, &= ~_PAGE_RW); | |
349 | PTE_BIT_FUNC(low, mkwrite, |= _PAGE_RW); | |
350 | PTE_BIT_FUNC(low, mkhuge, |= _PAGE_SZHUGE); | |
351 | #endif | |
352 | ||
353 | PTE_BIT_FUNC(low, mkclean, &= ~_PAGE_DIRTY); | |
354 | PTE_BIT_FUNC(low, mkdirty, |= _PAGE_DIRTY); | |
355 | PTE_BIT_FUNC(low, mkold, &= ~_PAGE_ACCESSED); | |
356 | PTE_BIT_FUNC(low, mkyoung, |= _PAGE_ACCESSED); | |
357 | ||
358 | /* | |
359 | * Macro and implementation to make a page protection as uncachable. | |
360 | */ | |
361 | #define pgprot_writecombine(prot) \ | |
362 | __pgprot(pgprot_val(prot) & ~_PAGE_CACHABLE) | |
363 | ||
364 | #define pgprot_noncached pgprot_writecombine | |
365 | ||
366 | /* | |
367 | * Conversion functions: convert a page and protection to a page entry, | |
368 | * and a page entry and page directory to the page they refer to. | |
369 | * | |
370 | * extern pte_t mk_pte(struct page *page, pgprot_t pgprot) | |
371 | */ | |
372 | #define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot)) | |
373 | ||
374 | static inline pte_t pte_modify(pte_t pte, pgprot_t newprot) | |
375 | { | |
376 | pte.pte_low &= _PAGE_CHG_MASK; | |
377 | pte.pte_low |= pgprot_val(newprot); | |
378 | ||
379 | #ifdef CONFIG_X2TLB | |
380 | pte.pte_high |= pgprot_val(newprot) >> 32; | |
381 | #endif | |
382 | ||
383 | return pte; | |
384 | } | |
385 | ||
386 | #define pmd_page_vaddr(pmd) ((unsigned long)pmd_val(pmd)) | |
387 | #define pmd_page(pmd) (virt_to_page(pmd_val(pmd))) | |
388 | ||
389 | /* to find an entry in a page-table-directory. */ | |
390 | #define pgd_index(address) (((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD-1)) | |
391 | #define pgd_offset(mm, address) ((mm)->pgd+pgd_index(address)) | |
392 | ||
393 | /* to find an entry in a kernel page-table-directory */ | |
394 | #define pgd_offset_k(address) pgd_offset(&init_mm, address) | |
395 | ||
396 | /* Find an entry in the third-level page table.. */ | |
397 | #define pte_index(address) ((address >> PAGE_SHIFT) & (PTRS_PER_PTE - 1)) | |
398 | #define pte_offset_kernel(dir, address) \ | |
399 | ((pte_t *) pmd_page_vaddr(*(dir)) + pte_index(address)) | |
400 | #define pte_offset_map(dir, address) pte_offset_kernel(dir, address) | |
401 | #define pte_offset_map_nested(dir, address) pte_offset_kernel(dir, address) | |
402 | ||
403 | #define pte_unmap(pte) do { } while (0) | |
404 | #define pte_unmap_nested(pte) do { } while (0) | |
405 | ||
406 | #ifdef CONFIG_X2TLB | |
407 | #define pte_ERROR(e) \ | |
408 | printk("%s:%d: bad pte %p(%08lx%08lx).\n", __FILE__, __LINE__, \ | |
409 | &(e), (e).pte_high, (e).pte_low) | |
410 | #define pgd_ERROR(e) \ | |
411 | printk("%s:%d: bad pgd %016llx.\n", __FILE__, __LINE__, pgd_val(e)) | |
412 | #else | |
413 | #define pte_ERROR(e) \ | |
414 | printk("%s:%d: bad pte %08lx.\n", __FILE__, __LINE__, pte_val(e)) | |
415 | #define pgd_ERROR(e) \ | |
416 | printk("%s:%d: bad pgd %08lx.\n", __FILE__, __LINE__, pgd_val(e)) | |
417 | #endif | |
418 | ||
419 | /* | |
420 | * Encode and de-code a swap entry | |
421 | * | |
422 | * Constraints: | |
423 | * _PAGE_FILE at bit 0 | |
424 | * _PAGE_PRESENT at bit 8 | |
425 | * _PAGE_PROTNONE at bit 9 | |
426 | * | |
427 | * For the normal case, we encode the swap type into bits 0:7 and the | |
428 | * swap offset into bits 10:30. For the 64-bit PTE case, we keep the | |
429 | * preserved bits in the low 32-bits and use the upper 32 as the swap | |
430 | * offset (along with a 5-bit type), following the same approach as x86 | |
431 | * PAE. This keeps the logic quite simple, and allows for a full 32 | |
432 | * PTE_FILE_MAX_BITS, as opposed to the 29-bits we're constrained with | |
433 | * in the pte_low case. | |
434 | * | |
435 | * As is evident by the Alpha code, if we ever get a 64-bit unsigned | |
436 | * long (swp_entry_t) to match up with the 64-bit PTEs, this all becomes | |
437 | * much cleaner.. | |
438 | * | |
439 | * NOTE: We should set ZEROs at the position of _PAGE_PRESENT | |
440 | * and _PAGE_PROTNONE bits | |
441 | */ | |
442 | #ifdef CONFIG_X2TLB | |
443 | #define __swp_type(x) ((x).val & 0x1f) | |
444 | #define __swp_offset(x) ((x).val >> 5) | |
445 | #define __swp_entry(type, offset) ((swp_entry_t){ (type) | (offset) << 5}) | |
446 | #define __pte_to_swp_entry(pte) ((swp_entry_t){ (pte).pte_high }) | |
447 | #define __swp_entry_to_pte(x) ((pte_t){ 0, (x).val }) | |
448 | ||
449 | /* | |
450 | * Encode and decode a nonlinear file mapping entry | |
451 | */ | |
452 | #define pte_to_pgoff(pte) ((pte).pte_high) | |
453 | #define pgoff_to_pte(off) ((pte_t) { _PAGE_FILE, (off) }) | |
454 | ||
455 | #define PTE_FILE_MAX_BITS 32 | |
456 | #else | |
457 | #define __swp_type(x) ((x).val & 0xff) | |
458 | #define __swp_offset(x) ((x).val >> 10) | |
459 | #define __swp_entry(type, offset) ((swp_entry_t){(type) | (offset) <<10}) | |
460 | ||
461 | #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) >> 1 }) | |
462 | #define __swp_entry_to_pte(x) ((pte_t) { (x).val << 1 }) | |
463 | ||
464 | /* | |
465 | * Encode and decode a nonlinear file mapping entry | |
466 | */ | |
467 | #define PTE_FILE_MAX_BITS 29 | |
468 | #define pte_to_pgoff(pte) (pte_val(pte) >> 1) | |
469 | #define pgoff_to_pte(off) ((pte_t) { ((off) << 1) | _PAGE_FILE }) | |
470 | #endif | |
471 | ||
472 | #endif /* __ASSEMBLY__ */ | |
473 | #endif /* __ASM_SH_PGTABLE_32_H */ |