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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 | * | |
fc55888f SM |
25 | * - On 29 bit platforms, bits 31 to 29 are used for the space attributes |
26 | * and timing control which (together with bit 0) are moved into the | |
27 | * old-style PTEA on the parts that support it. | |
249cfea9 PM |
28 | * |
29 | * XXX: Leave the _PAGE_FILE and _PAGE_WT overhaul for a rainy day. | |
30 | * | |
31 | * SH-X2 MMUs and extended PTEs | |
32 | * | |
33 | * SH-X2 supports an extended mode TLB with split data arrays due to the | |
34 | * number of bits needed for PR and SZ (now EPR and ESZ) encodings. The PR and | |
35 | * SZ bit placeholders still exist in data array 1, but are implemented as | |
36 | * reserved bits, with the real logic existing in data array 2. | |
37 | * | |
38 | * The downside to this is that we can no longer fit everything in to a 32-bit | |
39 | * PTE encoding, so a 64-bit pte_t is necessary for these parts. On the plus | |
40 | * side, this gives us quite a few spare bits to play with for future usage. | |
41 | */ | |
42 | /* Legacy and compat mode bits */ | |
43 | #define _PAGE_WT 0x001 /* WT-bit on SH-4, 0 on SH-3 */ | |
44 | #define _PAGE_HW_SHARED 0x002 /* SH-bit : shared among processes */ | |
45 | #define _PAGE_DIRTY 0x004 /* D-bit : page changed */ | |
46 | #define _PAGE_CACHABLE 0x008 /* C-bit : cachable */ | |
47 | #define _PAGE_SZ0 0x010 /* SZ0-bit : Size of page */ | |
48 | #define _PAGE_RW 0x020 /* PR0-bit : write access allowed */ | |
49 | #define _PAGE_USER 0x040 /* PR1-bit : user space access allowed*/ | |
50 | #define _PAGE_SZ1 0x080 /* SZ1-bit : Size of page (on SH-4) */ | |
51 | #define _PAGE_PRESENT 0x100 /* V-bit : page is valid */ | |
52 | #define _PAGE_PROTNONE 0x200 /* software: if not present */ | |
53 | #define _PAGE_ACCESSED 0x400 /* software: page referenced */ | |
54 | #define _PAGE_FILE _PAGE_WT /* software: pagecache or swap? */ | |
55 | ||
56 | #define _PAGE_SZ_MASK (_PAGE_SZ0 | _PAGE_SZ1) | |
57 | #define _PAGE_PR_MASK (_PAGE_RW | _PAGE_USER) | |
58 | ||
59 | /* Extended mode bits */ | |
60 | #define _PAGE_EXT_ESZ0 0x0010 /* ESZ0-bit: Size of page */ | |
61 | #define _PAGE_EXT_ESZ1 0x0020 /* ESZ1-bit: Size of page */ | |
62 | #define _PAGE_EXT_ESZ2 0x0040 /* ESZ2-bit: Size of page */ | |
63 | #define _PAGE_EXT_ESZ3 0x0080 /* ESZ3-bit: Size of page */ | |
64 | ||
65 | #define _PAGE_EXT_USER_EXEC 0x0100 /* EPR0-bit: User space executable */ | |
66 | #define _PAGE_EXT_USER_WRITE 0x0200 /* EPR1-bit: User space writable */ | |
67 | #define _PAGE_EXT_USER_READ 0x0400 /* EPR2-bit: User space readable */ | |
68 | ||
69 | #define _PAGE_EXT_KERN_EXEC 0x0800 /* EPR3-bit: Kernel space executable */ | |
70 | #define _PAGE_EXT_KERN_WRITE 0x1000 /* EPR4-bit: Kernel space writable */ | |
71 | #define _PAGE_EXT_KERN_READ 0x2000 /* EPR5-bit: Kernel space readable */ | |
72 | ||
73 | /* Wrapper for extended mode pgprot twiddling */ | |
74 | #define _PAGE_EXT(x) ((unsigned long long)(x) << 32) | |
75 | ||
76 | /* software: moves to PTEA.TC (Timing Control) */ | |
77 | #define _PAGE_PCC_AREA5 0x00000000 /* use BSC registers for area5 */ | |
78 | #define _PAGE_PCC_AREA6 0x80000000 /* use BSC registers for area6 */ | |
79 | ||
80 | /* software: moves to PTEA.SA[2:0] (Space Attributes) */ | |
81 | #define _PAGE_PCC_IODYN 0x00000001 /* IO space, dynamically sized bus */ | |
82 | #define _PAGE_PCC_IO8 0x20000000 /* IO space, 8 bit bus */ | |
83 | #define _PAGE_PCC_IO16 0x20000001 /* IO space, 16 bit bus */ | |
84 | #define _PAGE_PCC_COM8 0x40000000 /* Common Memory space, 8 bit bus */ | |
85 | #define _PAGE_PCC_COM16 0x40000001 /* Common Memory space, 16 bit bus */ | |
86 | #define _PAGE_PCC_ATR8 0x60000000 /* Attribute Memory space, 8 bit bus */ | |
87 | #define _PAGE_PCC_ATR16 0x60000001 /* Attribute Memory space, 6 bit bus */ | |
88 | ||
89 | /* Mask which drops unused bits from the PTEL value */ | |
90 | #if defined(CONFIG_CPU_SH3) | |
91 | #define _PAGE_CLEAR_FLAGS (_PAGE_PROTNONE | _PAGE_ACCESSED| \ | |
92 | _PAGE_FILE | _PAGE_SZ1 | \ | |
93 | _PAGE_HW_SHARED) | |
94 | #elif defined(CONFIG_X2TLB) | |
95 | /* Get rid of the legacy PR/SZ bits when using extended mode */ | |
96 | #define _PAGE_CLEAR_FLAGS (_PAGE_PROTNONE | _PAGE_ACCESSED | \ | |
97 | _PAGE_FILE | _PAGE_PR_MASK | _PAGE_SZ_MASK) | |
98 | #else | |
99 | #define _PAGE_CLEAR_FLAGS (_PAGE_PROTNONE | _PAGE_ACCESSED | _PAGE_FILE) | |
100 | #endif | |
101 | ||
d02b08f6 | 102 | #define _PAGE_FLAGS_HARDWARE_MASK (PHYS_ADDR_MASK & ~(_PAGE_CLEAR_FLAGS)) |
249cfea9 PM |
103 | |
104 | /* Hardware flags, page size encoding */ | |
66dfe181 PM |
105 | #if !defined(CONFIG_MMU) |
106 | # define _PAGE_FLAGS_HARD 0ULL | |
107 | #elif defined(CONFIG_X2TLB) | |
249cfea9 PM |
108 | # if defined(CONFIG_PAGE_SIZE_4KB) |
109 | # define _PAGE_FLAGS_HARD _PAGE_EXT(_PAGE_EXT_ESZ0) | |
110 | # elif defined(CONFIG_PAGE_SIZE_8KB) | |
111 | # define _PAGE_FLAGS_HARD _PAGE_EXT(_PAGE_EXT_ESZ1) | |
112 | # elif defined(CONFIG_PAGE_SIZE_64KB) | |
113 | # define _PAGE_FLAGS_HARD _PAGE_EXT(_PAGE_EXT_ESZ2) | |
114 | # endif | |
115 | #else | |
116 | # if defined(CONFIG_PAGE_SIZE_4KB) | |
117 | # define _PAGE_FLAGS_HARD _PAGE_SZ0 | |
118 | # elif defined(CONFIG_PAGE_SIZE_64KB) | |
119 | # define _PAGE_FLAGS_HARD _PAGE_SZ1 | |
120 | # endif | |
121 | #endif | |
122 | ||
123 | #if defined(CONFIG_X2TLB) | |
124 | # if defined(CONFIG_HUGETLB_PAGE_SIZE_64K) | |
125 | # define _PAGE_SZHUGE (_PAGE_EXT_ESZ2) | |
126 | # elif defined(CONFIG_HUGETLB_PAGE_SIZE_256K) | |
127 | # define _PAGE_SZHUGE (_PAGE_EXT_ESZ0 | _PAGE_EXT_ESZ2) | |
128 | # elif defined(CONFIG_HUGETLB_PAGE_SIZE_1MB) | |
129 | # define _PAGE_SZHUGE (_PAGE_EXT_ESZ0 | _PAGE_EXT_ESZ1 | _PAGE_EXT_ESZ2) | |
130 | # elif defined(CONFIG_HUGETLB_PAGE_SIZE_4MB) | |
131 | # define _PAGE_SZHUGE (_PAGE_EXT_ESZ3) | |
132 | # elif defined(CONFIG_HUGETLB_PAGE_SIZE_64MB) | |
133 | # define _PAGE_SZHUGE (_PAGE_EXT_ESZ2 | _PAGE_EXT_ESZ3) | |
134 | # endif | |
135 | #else | |
136 | # if defined(CONFIG_HUGETLB_PAGE_SIZE_64K) | |
137 | # define _PAGE_SZHUGE (_PAGE_SZ1) | |
138 | # elif defined(CONFIG_HUGETLB_PAGE_SIZE_1MB) | |
139 | # define _PAGE_SZHUGE (_PAGE_SZ0 | _PAGE_SZ1) | |
140 | # endif | |
141 | #endif | |
142 | ||
143 | /* | |
144 | * Stub out _PAGE_SZHUGE if we don't have a good definition for it, | |
145 | * to make pte_mkhuge() happy. | |
146 | */ | |
147 | #ifndef _PAGE_SZHUGE | |
148 | # define _PAGE_SZHUGE (_PAGE_FLAGS_HARD) | |
149 | #endif | |
150 | ||
151 | #define _PAGE_CHG_MASK \ | |
152 | (PTE_MASK | _PAGE_ACCESSED | _PAGE_CACHABLE | _PAGE_DIRTY) | |
153 | ||
154 | #ifndef __ASSEMBLY__ | |
155 | ||
156 | #if defined(CONFIG_X2TLB) /* SH-X2 TLB */ | |
157 | #define PAGE_NONE __pgprot(_PAGE_PROTNONE | _PAGE_CACHABLE | \ | |
158 | _PAGE_ACCESSED | _PAGE_FLAGS_HARD) | |
159 | ||
160 | #define PAGE_SHARED __pgprot(_PAGE_PRESENT | _PAGE_ACCESSED | \ | |
161 | _PAGE_CACHABLE | _PAGE_FLAGS_HARD | \ | |
162 | _PAGE_EXT(_PAGE_EXT_KERN_READ | \ | |
163 | _PAGE_EXT_KERN_WRITE | \ | |
164 | _PAGE_EXT_USER_READ | \ | |
165 | _PAGE_EXT_USER_WRITE)) | |
166 | ||
167 | #define PAGE_EXECREAD __pgprot(_PAGE_PRESENT | _PAGE_ACCESSED | \ | |
168 | _PAGE_CACHABLE | _PAGE_FLAGS_HARD | \ | |
169 | _PAGE_EXT(_PAGE_EXT_KERN_EXEC | \ | |
170 | _PAGE_EXT_KERN_READ | \ | |
171 | _PAGE_EXT_USER_EXEC | \ | |
172 | _PAGE_EXT_USER_READ)) | |
173 | ||
174 | #define PAGE_COPY PAGE_EXECREAD | |
175 | ||
176 | #define PAGE_READONLY __pgprot(_PAGE_PRESENT | _PAGE_ACCESSED | \ | |
177 | _PAGE_CACHABLE | _PAGE_FLAGS_HARD | \ | |
178 | _PAGE_EXT(_PAGE_EXT_KERN_READ | \ | |
179 | _PAGE_EXT_USER_READ)) | |
180 | ||
181 | #define PAGE_WRITEONLY __pgprot(_PAGE_PRESENT | _PAGE_ACCESSED | \ | |
182 | _PAGE_CACHABLE | _PAGE_FLAGS_HARD | \ | |
183 | _PAGE_EXT(_PAGE_EXT_KERN_WRITE | \ | |
184 | _PAGE_EXT_USER_WRITE)) | |
185 | ||
186 | #define PAGE_RWX __pgprot(_PAGE_PRESENT | _PAGE_ACCESSED | \ | |
187 | _PAGE_CACHABLE | _PAGE_FLAGS_HARD | \ | |
188 | _PAGE_EXT(_PAGE_EXT_KERN_WRITE | \ | |
189 | _PAGE_EXT_KERN_READ | \ | |
190 | _PAGE_EXT_KERN_EXEC | \ | |
191 | _PAGE_EXT_USER_WRITE | \ | |
192 | _PAGE_EXT_USER_READ | \ | |
193 | _PAGE_EXT_USER_EXEC)) | |
194 | ||
195 | #define PAGE_KERNEL __pgprot(_PAGE_PRESENT | _PAGE_CACHABLE | \ | |
196 | _PAGE_DIRTY | _PAGE_ACCESSED | \ | |
197 | _PAGE_HW_SHARED | _PAGE_FLAGS_HARD | \ | |
198 | _PAGE_EXT(_PAGE_EXT_KERN_READ | \ | |
199 | _PAGE_EXT_KERN_WRITE | \ | |
200 | _PAGE_EXT_KERN_EXEC)) | |
201 | ||
202 | #define PAGE_KERNEL_NOCACHE \ | |
203 | __pgprot(_PAGE_PRESENT | _PAGE_DIRTY | \ | |
204 | _PAGE_ACCESSED | _PAGE_HW_SHARED | \ | |
205 | _PAGE_FLAGS_HARD | \ | |
206 | _PAGE_EXT(_PAGE_EXT_KERN_READ | \ | |
207 | _PAGE_EXT_KERN_WRITE | \ | |
208 | _PAGE_EXT_KERN_EXEC)) | |
209 | ||
210 | #define PAGE_KERNEL_RO __pgprot(_PAGE_PRESENT | _PAGE_CACHABLE | \ | |
211 | _PAGE_DIRTY | _PAGE_ACCESSED | \ | |
212 | _PAGE_HW_SHARED | _PAGE_FLAGS_HARD | \ | |
213 | _PAGE_EXT(_PAGE_EXT_KERN_READ | \ | |
214 | _PAGE_EXT_KERN_EXEC)) | |
215 | ||
216 | #define PAGE_KERNEL_PCC(slot, type) \ | |
217 | __pgprot(_PAGE_PRESENT | _PAGE_DIRTY | \ | |
218 | _PAGE_ACCESSED | _PAGE_FLAGS_HARD | \ | |
219 | _PAGE_EXT(_PAGE_EXT_KERN_READ | \ | |
220 | _PAGE_EXT_KERN_WRITE | \ | |
221 | _PAGE_EXT_KERN_EXEC) \ | |
222 | (slot ? _PAGE_PCC_AREA5 : _PAGE_PCC_AREA6) | \ | |
223 | (type)) | |
224 | ||
225 | #elif defined(CONFIG_MMU) /* SH-X TLB */ | |
226 | #define PAGE_NONE __pgprot(_PAGE_PROTNONE | _PAGE_CACHABLE | \ | |
227 | _PAGE_ACCESSED | _PAGE_FLAGS_HARD) | |
228 | ||
229 | #define PAGE_SHARED __pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_USER | \ | |
230 | _PAGE_CACHABLE | _PAGE_ACCESSED | \ | |
231 | _PAGE_FLAGS_HARD) | |
232 | ||
233 | #define PAGE_COPY __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_CACHABLE | \ | |
234 | _PAGE_ACCESSED | _PAGE_FLAGS_HARD) | |
235 | ||
236 | #define PAGE_READONLY __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_CACHABLE | \ | |
237 | _PAGE_ACCESSED | _PAGE_FLAGS_HARD) | |
238 | ||
239 | #define PAGE_EXECREAD PAGE_READONLY | |
240 | #define PAGE_RWX PAGE_SHARED | |
241 | #define PAGE_WRITEONLY PAGE_SHARED | |
242 | ||
243 | #define PAGE_KERNEL __pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_CACHABLE | \ | |
244 | _PAGE_DIRTY | _PAGE_ACCESSED | \ | |
245 | _PAGE_HW_SHARED | _PAGE_FLAGS_HARD) | |
246 | ||
247 | #define PAGE_KERNEL_NOCACHE \ | |
248 | __pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_DIRTY | \ | |
249 | _PAGE_ACCESSED | _PAGE_HW_SHARED | \ | |
250 | _PAGE_FLAGS_HARD) | |
251 | ||
252 | #define PAGE_KERNEL_RO __pgprot(_PAGE_PRESENT | _PAGE_CACHABLE | \ | |
253 | _PAGE_DIRTY | _PAGE_ACCESSED | \ | |
254 | _PAGE_HW_SHARED | _PAGE_FLAGS_HARD) | |
255 | ||
256 | #define PAGE_KERNEL_PCC(slot, type) \ | |
257 | __pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_DIRTY | \ | |
258 | _PAGE_ACCESSED | _PAGE_FLAGS_HARD | \ | |
259 | (slot ? _PAGE_PCC_AREA5 : _PAGE_PCC_AREA6) | \ | |
260 | (type)) | |
261 | #else /* no mmu */ | |
262 | #define PAGE_NONE __pgprot(0) | |
263 | #define PAGE_SHARED __pgprot(0) | |
264 | #define PAGE_COPY __pgprot(0) | |
265 | #define PAGE_EXECREAD __pgprot(0) | |
266 | #define PAGE_RWX __pgprot(0) | |
267 | #define PAGE_READONLY __pgprot(0) | |
268 | #define PAGE_WRITEONLY __pgprot(0) | |
269 | #define PAGE_KERNEL __pgprot(0) | |
270 | #define PAGE_KERNEL_NOCACHE __pgprot(0) | |
271 | #define PAGE_KERNEL_RO __pgprot(0) | |
272 | ||
273 | #define PAGE_KERNEL_PCC(slot, type) \ | |
274 | __pgprot(0) | |
275 | #endif | |
276 | ||
277 | #endif /* __ASSEMBLY__ */ | |
278 | ||
279 | #ifndef __ASSEMBLY__ | |
280 | ||
281 | /* | |
282 | * Certain architectures need to do special things when PTEs | |
283 | * within a page table are directly modified. Thus, the following | |
284 | * hook is made available. | |
285 | */ | |
286 | #ifdef CONFIG_X2TLB | |
287 | static inline void set_pte(pte_t *ptep, pte_t pte) | |
288 | { | |
289 | ptep->pte_high = pte.pte_high; | |
290 | smp_wmb(); | |
291 | ptep->pte_low = pte.pte_low; | |
292 | } | |
293 | #else | |
294 | #define set_pte(pteptr, pteval) (*(pteptr) = pteval) | |
295 | #endif | |
296 | ||
297 | #define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval) | |
298 | ||
299 | /* | |
300 | * (pmds are folded into pgds so this doesn't get actually called, | |
301 | * but the define is needed for a generic inline function.) | |
302 | */ | |
303 | #define set_pmd(pmdptr, pmdval) (*(pmdptr) = pmdval) | |
304 | ||
305 | #define pfn_pte(pfn, prot) \ | |
306 | __pte(((unsigned long long)(pfn) << PAGE_SHIFT) | pgprot_val(prot)) | |
307 | #define pfn_pmd(pfn, prot) \ | |
308 | __pmd(((unsigned long long)(pfn) << PAGE_SHIFT) | pgprot_val(prot)) | |
309 | ||
310 | #define pte_none(x) (!pte_val(x)) | |
311 | #define pte_present(x) ((x).pte_low & (_PAGE_PRESENT | _PAGE_PROTNONE)) | |
312 | ||
313 | #define pte_clear(mm,addr,xp) do { set_pte_at(mm, addr, xp, __pte(0)); } while (0) | |
314 | ||
315 | #define pmd_none(x) (!pmd_val(x)) | |
316 | #define pmd_present(x) (pmd_val(x)) | |
317 | #define pmd_clear(xp) do { set_pmd(xp, __pmd(0)); } while (0) | |
318 | #define pmd_bad(x) (pmd_val(x) & ~PAGE_MASK) | |
319 | ||
320 | #define pages_to_mb(x) ((x) >> (20-PAGE_SHIFT)) | |
321 | #define pte_page(x) pfn_to_page(pte_pfn(x)) | |
322 | ||
323 | /* | |
324 | * The following only work if pte_present() is true. | |
325 | * Undefined behaviour if not.. | |
326 | */ | |
327 | #define pte_not_present(pte) (!((pte).pte_low & _PAGE_PRESENT)) | |
328 | #define pte_dirty(pte) ((pte).pte_low & _PAGE_DIRTY) | |
329 | #define pte_young(pte) ((pte).pte_low & _PAGE_ACCESSED) | |
330 | #define pte_file(pte) ((pte).pte_low & _PAGE_FILE) | |
7e675137 | 331 | #define pte_special(pte) (0) |
249cfea9 PM |
332 | |
333 | #ifdef CONFIG_X2TLB | |
334 | #define pte_write(pte) ((pte).pte_high & _PAGE_EXT_USER_WRITE) | |
335 | #else | |
336 | #define pte_write(pte) ((pte).pte_low & _PAGE_RW) | |
337 | #endif | |
338 | ||
339 | #define PTE_BIT_FUNC(h,fn,op) \ | |
340 | static inline pte_t pte_##fn(pte_t pte) { pte.pte_##h op; return pte; } | |
341 | ||
342 | #ifdef CONFIG_X2TLB | |
343 | /* | |
344 | * We cheat a bit in the SH-X2 TLB case. As the permission bits are | |
345 | * individually toggled (and user permissions are entirely decoupled from | |
346 | * kernel permissions), we attempt to couple them a bit more sanely here. | |
347 | */ | |
348 | PTE_BIT_FUNC(high, wrprotect, &= ~_PAGE_EXT_USER_WRITE); | |
349 | PTE_BIT_FUNC(high, mkwrite, |= _PAGE_EXT_USER_WRITE | _PAGE_EXT_KERN_WRITE); | |
350 | PTE_BIT_FUNC(high, mkhuge, |= _PAGE_SZHUGE); | |
351 | #else | |
352 | PTE_BIT_FUNC(low, wrprotect, &= ~_PAGE_RW); | |
353 | PTE_BIT_FUNC(low, mkwrite, |= _PAGE_RW); | |
354 | PTE_BIT_FUNC(low, mkhuge, |= _PAGE_SZHUGE); | |
355 | #endif | |
356 | ||
357 | PTE_BIT_FUNC(low, mkclean, &= ~_PAGE_DIRTY); | |
358 | PTE_BIT_FUNC(low, mkdirty, |= _PAGE_DIRTY); | |
359 | PTE_BIT_FUNC(low, mkold, &= ~_PAGE_ACCESSED); | |
360 | PTE_BIT_FUNC(low, mkyoung, |= _PAGE_ACCESSED); | |
361 | ||
7e675137 NP |
362 | static inline pte_t pte_mkspecial(pte_t pte) { return pte; } |
363 | ||
249cfea9 PM |
364 | /* |
365 | * Macro and implementation to make a page protection as uncachable. | |
366 | */ | |
367 | #define pgprot_writecombine(prot) \ | |
368 | __pgprot(pgprot_val(prot) & ~_PAGE_CACHABLE) | |
369 | ||
370 | #define pgprot_noncached pgprot_writecombine | |
371 | ||
372 | /* | |
373 | * Conversion functions: convert a page and protection to a page entry, | |
374 | * and a page entry and page directory to the page they refer to. | |
375 | * | |
376 | * extern pte_t mk_pte(struct page *page, pgprot_t pgprot) | |
377 | */ | |
378 | #define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot)) | |
379 | ||
380 | static inline pte_t pte_modify(pte_t pte, pgprot_t newprot) | |
381 | { | |
382 | pte.pte_low &= _PAGE_CHG_MASK; | |
383 | pte.pte_low |= pgprot_val(newprot); | |
384 | ||
385 | #ifdef CONFIG_X2TLB | |
386 | pte.pte_high |= pgprot_val(newprot) >> 32; | |
387 | #endif | |
388 | ||
389 | return pte; | |
390 | } | |
391 | ||
392 | #define pmd_page_vaddr(pmd) ((unsigned long)pmd_val(pmd)) | |
393 | #define pmd_page(pmd) (virt_to_page(pmd_val(pmd))) | |
394 | ||
395 | /* to find an entry in a page-table-directory. */ | |
396 | #define pgd_index(address) (((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD-1)) | |
397 | #define pgd_offset(mm, address) ((mm)->pgd+pgd_index(address)) | |
398 | ||
399 | /* to find an entry in a kernel page-table-directory */ | |
400 | #define pgd_offset_k(address) pgd_offset(&init_mm, address) | |
401 | ||
402 | /* Find an entry in the third-level page table.. */ | |
403 | #define pte_index(address) ((address >> PAGE_SHIFT) & (PTRS_PER_PTE - 1)) | |
404 | #define pte_offset_kernel(dir, address) \ | |
405 | ((pte_t *) pmd_page_vaddr(*(dir)) + pte_index(address)) | |
406 | #define pte_offset_map(dir, address) pte_offset_kernel(dir, address) | |
407 | #define pte_offset_map_nested(dir, address) pte_offset_kernel(dir, address) | |
408 | ||
409 | #define pte_unmap(pte) do { } while (0) | |
410 | #define pte_unmap_nested(pte) do { } while (0) | |
411 | ||
412 | #ifdef CONFIG_X2TLB | |
413 | #define pte_ERROR(e) \ | |
414 | printk("%s:%d: bad pte %p(%08lx%08lx).\n", __FILE__, __LINE__, \ | |
415 | &(e), (e).pte_high, (e).pte_low) | |
416 | #define pgd_ERROR(e) \ | |
417 | printk("%s:%d: bad pgd %016llx.\n", __FILE__, __LINE__, pgd_val(e)) | |
418 | #else | |
419 | #define pte_ERROR(e) \ | |
420 | printk("%s:%d: bad pte %08lx.\n", __FILE__, __LINE__, pte_val(e)) | |
421 | #define pgd_ERROR(e) \ | |
422 | printk("%s:%d: bad pgd %08lx.\n", __FILE__, __LINE__, pgd_val(e)) | |
423 | #endif | |
424 | ||
425 | /* | |
426 | * Encode and de-code a swap entry | |
427 | * | |
428 | * Constraints: | |
429 | * _PAGE_FILE at bit 0 | |
430 | * _PAGE_PRESENT at bit 8 | |
431 | * _PAGE_PROTNONE at bit 9 | |
432 | * | |
433 | * For the normal case, we encode the swap type into bits 0:7 and the | |
434 | * swap offset into bits 10:30. For the 64-bit PTE case, we keep the | |
435 | * preserved bits in the low 32-bits and use the upper 32 as the swap | |
436 | * offset (along with a 5-bit type), following the same approach as x86 | |
437 | * PAE. This keeps the logic quite simple, and allows for a full 32 | |
438 | * PTE_FILE_MAX_BITS, as opposed to the 29-bits we're constrained with | |
439 | * in the pte_low case. | |
440 | * | |
441 | * As is evident by the Alpha code, if we ever get a 64-bit unsigned | |
442 | * long (swp_entry_t) to match up with the 64-bit PTEs, this all becomes | |
443 | * much cleaner.. | |
444 | * | |
445 | * NOTE: We should set ZEROs at the position of _PAGE_PRESENT | |
446 | * and _PAGE_PROTNONE bits | |
447 | */ | |
448 | #ifdef CONFIG_X2TLB | |
449 | #define __swp_type(x) ((x).val & 0x1f) | |
450 | #define __swp_offset(x) ((x).val >> 5) | |
451 | #define __swp_entry(type, offset) ((swp_entry_t){ (type) | (offset) << 5}) | |
452 | #define __pte_to_swp_entry(pte) ((swp_entry_t){ (pte).pte_high }) | |
453 | #define __swp_entry_to_pte(x) ((pte_t){ 0, (x).val }) | |
454 | ||
455 | /* | |
456 | * Encode and decode a nonlinear file mapping entry | |
457 | */ | |
458 | #define pte_to_pgoff(pte) ((pte).pte_high) | |
459 | #define pgoff_to_pte(off) ((pte_t) { _PAGE_FILE, (off) }) | |
460 | ||
461 | #define PTE_FILE_MAX_BITS 32 | |
462 | #else | |
463 | #define __swp_type(x) ((x).val & 0xff) | |
464 | #define __swp_offset(x) ((x).val >> 10) | |
465 | #define __swp_entry(type, offset) ((swp_entry_t){(type) | (offset) <<10}) | |
466 | ||
467 | #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) >> 1 }) | |
468 | #define __swp_entry_to_pte(x) ((pte_t) { (x).val << 1 }) | |
469 | ||
470 | /* | |
471 | * Encode and decode a nonlinear file mapping entry | |
472 | */ | |
473 | #define PTE_FILE_MAX_BITS 29 | |
474 | #define pte_to_pgoff(pte) (pte_val(pte) >> 1) | |
475 | #define pgoff_to_pte(off) ((pte_t) { ((off) << 1) | _PAGE_FILE }) | |
476 | #endif | |
477 | ||
478 | #endif /* __ASSEMBLY__ */ | |
479 | #endif /* __ASM_SH_PGTABLE_32_H */ |