1 #ifndef _ASM_POWERPC_PGTABLE_PPC32_H
2 #define _ASM_POWERPC_PGTABLE_PPC32_H
3
4 #include <asm-generic/pgtable-nopmd.h>
5
6 #ifndef __ASSEMBLY__
7 #include <linux/sched.h>
8 #include <linux/threads.h>
9 #include <asm/io.h> /* For sub-arch specific PPC_PIN_SIZE */
10
11 extern unsigned long va_to_phys(unsigned long address);
12 extern pte_t *va_to_pte(unsigned long address);
13 extern unsigned long ioremap_bot, ioremap_base;
14
15 #ifdef CONFIG_44x
16 extern int icache_44x_need_flush;
17 #endif
18
19 #endif /* __ASSEMBLY__ */
20
21 /*
22 * The PowerPC MMU uses a hash table containing PTEs, together with
23 * a set of 16 segment registers (on 32-bit implementations), to define
24 * the virtual to physical address mapping.
25 *
26 * We use the hash table as an extended TLB, i.e. a cache of currently
27 * active mappings. We maintain a two-level page table tree, much
28 * like that used by the i386, for the sake of the Linux memory
29 * management code. Low-level assembler code in hashtable.S
30 * (procedure hash_page) is responsible for extracting ptes from the
31 * tree and putting them into the hash table when necessary, and
32 * updating the accessed and modified bits in the page table tree.
33 */
34
35 /*
36 * The PowerPC MPC8xx uses a TLB with hardware assisted, software tablewalk.
37 * We also use the two level tables, but we can put the real bits in them
38 * needed for the TLB and tablewalk. These definitions require Mx_CTR.PPM = 0,
39 * Mx_CTR.PPCS = 0, and MD_CTR.TWAM = 1. The level 2 descriptor has
40 * additional page protection (when Mx_CTR.PPCS = 1) that allows TLB hit
41 * based upon user/super access. The TLB does not have accessed nor write
42 * protect. We assume that if the TLB get loaded with an entry it is
43 * accessed, and overload the changed bit for write protect. We use
44 * two bits in the software pte that are supposed to be set to zero in
45 * the TLB entry (24 and 25) for these indicators. Although the level 1
46 * descriptor contains the guarded and writethrough/copyback bits, we can
47 * set these at the page level since they get copied from the Mx_TWC
48 * register when the TLB entry is loaded. We will use bit 27 for guard, since
49 * that is where it exists in the MD_TWC, and bit 26 for writethrough.
50 * These will get masked from the level 2 descriptor at TLB load time, and
51 * copied to the MD_TWC before it gets loaded.
52 * Large page sizes added. We currently support two sizes, 4K and 8M.
53 * This also allows a TLB hander optimization because we can directly
54 * load the PMD into MD_TWC. The 8M pages are only used for kernel
55 * mapping of well known areas. The PMD (PGD) entries contain control
56 * flags in addition to the address, so care must be taken that the
57 * software no longer assumes these are only pointers.
58 */
59
60 /*
61 * At present, all PowerPC 400-class processors share a similar TLB
62 * architecture. The instruction and data sides share a unified,
63 * 64-entry, fully-associative TLB which is maintained totally under
64 * software control. In addition, the instruction side has a
65 * hardware-managed, 4-entry, fully-associative TLB which serves as a
66 * first level to the shared TLB. These two TLBs are known as the UTLB
67 * and ITLB, respectively (see "mmu.h" for definitions).
68 */
69
70 /*
71 * The normal case is that PTEs are 32-bits and we have a 1-page
72 * 1024-entry pgdir pointing to 1-page 1024-entry PTE pages. -- paulus
73 *
74 * For any >32-bit physical address platform, we can use the following
75 * two level page table layout where the pgdir is 8KB and the MS 13 bits
76 * are an index to the second level table. The combined pgdir/pmd first
77 * level has 2048 entries and the second level has 512 64-bit PTE entries.
78 * -Matt
79 */
80 /* PGDIR_SHIFT determines what a top-level page table entry can map */
81 #define PGDIR_SHIFT (PAGE_SHIFT + PTE_SHIFT)
82 #define PGDIR_SIZE (1UL << PGDIR_SHIFT)
83 #define PGDIR_MASK (~(PGDIR_SIZE-1))
84
85 /*
86 * entries per page directory level: our page-table tree is two-level, so
87 * we don't really have any PMD directory.
88 */
89 #ifndef __ASSEMBLY__
90 #define PTE_TABLE_SIZE (sizeof(pte_t) << PTE_SHIFT)
91 #define PGD_TABLE_SIZE (sizeof(pgd_t) << (32 - PGDIR_SHIFT))
92 #endif /* __ASSEMBLY__ */
93
94 #define PTRS_PER_PTE (1 << PTE_SHIFT)
95 #define PTRS_PER_PMD 1
96 #define PTRS_PER_PGD (1 << (32 - PGDIR_SHIFT))
97
98 #define USER_PTRS_PER_PGD (TASK_SIZE / PGDIR_SIZE)
99 #define FIRST_USER_ADDRESS 0
100
101 #define pte_ERROR(e) \
102 printk("%s:%d: bad pte %llx.\n", __FILE__, __LINE__, \
103 (unsigned long long)pte_val(e))
104 #define pgd_ERROR(e) \
105 printk("%s:%d: bad pgd %08lx.\n", __FILE__, __LINE__, pgd_val(e))
106
107 /*
108 * Just any arbitrary offset to the start of the vmalloc VM area: the
109 * current 64MB value just means that there will be a 64MB "hole" after the
110 * physical memory until the kernel virtual memory starts. That means that
111 * any out-of-bounds memory accesses will hopefully be caught.
112 * The vmalloc() routines leaves a hole of 4kB between each vmalloced
113 * area for the same reason. ;)
114 *
115 * We no longer map larger than phys RAM with the BATs so we don't have
116 * to worry about the VMALLOC_OFFSET causing problems. We do have to worry
117 * about clashes between our early calls to ioremap() that start growing down
118 * from ioremap_base being run into the VM area allocations (growing upwards
119 * from VMALLOC_START). For this reason we have ioremap_bot to check when
120 * we actually run into our mappings setup in the early boot with the VM
121 * system. This really does become a problem for machines with good amounts
122 * of RAM. -- Cort
123 */
124 #define VMALLOC_OFFSET (0x1000000) /* 16M */
125 #ifdef PPC_PIN_SIZE
126 #define VMALLOC_START (((_ALIGN((long)high_memory, PPC_PIN_SIZE) + VMALLOC_OFFSET) & ~(VMALLOC_OFFSET-1)))
127 #else
128 #define VMALLOC_START ((((long)high_memory + VMALLOC_OFFSET) & ~(VMALLOC_OFFSET-1)))
129 #endif
130 #define VMALLOC_END ioremap_bot
131
132 /*
133 * Bits in a linux-style PTE. These match the bits in the
134 * (hardware-defined) PowerPC PTE as closely as possible.
135 */
136
137 #if defined(CONFIG_40x)
138
139 /* There are several potential gotchas here. The 40x hardware TLBLO
140 field looks like this:
141
142 0 1 2 3 4 ... 18 19 20 21 22 23 24 25 26 27 28 29 30 31
143 RPN..................... 0 0 EX WR ZSEL....... W I M G
144
145 Where possible we make the Linux PTE bits match up with this
146
147 - bits 20 and 21 must be cleared, because we use 4k pages (40x can
148 support down to 1k pages), this is done in the TLBMiss exception
149 handler.
150 - We use only zones 0 (for kernel pages) and 1 (for user pages)
151 of the 16 available. Bit 24-26 of the TLB are cleared in the TLB
152 miss handler. Bit 27 is PAGE_USER, thus selecting the correct
153 zone.
154 - PRESENT *must* be in the bottom two bits because swap cache
155 entries use the top 30 bits. Because 40x doesn't support SMP
156 anyway, M is irrelevant so we borrow it for PAGE_PRESENT. Bit 30
157 is cleared in the TLB miss handler before the TLB entry is loaded.
158 - All other bits of the PTE are loaded into TLBLO without
159 modification, leaving us only the bits 20, 21, 24, 25, 26, 30 for
160 software PTE bits. We actually use use bits 21, 24, 25, and
161 30 respectively for the software bits: ACCESSED, DIRTY, RW, and
162 PRESENT.
163 */
164
165 /* Definitions for 40x embedded chips. */
166 #define _PAGE_GUARDED 0x001 /* G: page is guarded from prefetch */
167 #define _PAGE_FILE 0x001 /* when !present: nonlinear file mapping */
168 #define _PAGE_PRESENT 0x002 /* software: PTE contains a translation */
169 #define _PAGE_NO_CACHE 0x004 /* I: caching is inhibited */
170 #define _PAGE_WRITETHRU 0x008 /* W: caching is write-through */
171 #define _PAGE_USER 0x010 /* matches one of the zone permission bits */
172 #define _PAGE_RW 0x040 /* software: Writes permitted */
173 #define _PAGE_DIRTY 0x080 /* software: dirty page */
174 #define _PAGE_HWWRITE 0x100 /* hardware: Dirty & RW, set in exception */
175 #define _PAGE_HWEXEC 0x200 /* hardware: EX permission */
176 #define _PAGE_ACCESSED 0x400 /* software: R: page referenced */
177
178 #define _PMD_PRESENT 0x400 /* PMD points to page of PTEs */
179 #define _PMD_BAD 0x802
180 #define _PMD_SIZE 0x0e0 /* size field, != 0 for large-page PMD entry */
181 #define _PMD_SIZE_4M 0x0c0
182 #define _PMD_SIZE_16M 0x0e0
183 #define PMD_PAGE_SIZE(pmdval) (1024 << (((pmdval) & _PMD_SIZE) >> 4))
184
185 /* Until my rework is finished, 40x still needs atomic PTE updates */
186 #define PTE_ATOMIC_UPDATES 1
187
188 #elif defined(CONFIG_44x)
189 /*
190 * Definitions for PPC440
191 *
192 * Because of the 3 word TLB entries to support 36-bit addressing,
193 * the attribute are difficult to map in such a fashion that they
194 * are easily loaded during exception processing. I decided to
195 * organize the entry so the ERPN is the only portion in the
196 * upper word of the PTE and the attribute bits below are packed
197 * in as sensibly as they can be in the area below a 4KB page size
198 * oriented RPN. This at least makes it easy to load the RPN and
199 * ERPN fields in the TLB. -Matt
200 *
201 * Note that these bits preclude future use of a page size
202 * less than 4KB.
203 *
204 *
205 * PPC 440 core has following TLB attribute fields;
206 *
207 * TLB1:
208 * 0 1 2 3 4 ... 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31
209 * RPN................................. - - - - - - ERPN.......
210 *
211 * TLB2:
212 * 0 1 2 3 4 ... 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31
213 * - - - - - - U0 U1 U2 U3 W I M G E - UX UW UR SX SW SR
214 *
215 * Newer 440 cores (440x6 as used on AMCC 460EX/460GT) have additional
216 * TLB2 storage attibute fields. Those are:
217 *
218 * TLB2:
219 * 0...10 11 12 13 14 15 16...31
220 * no change WL1 IL1I IL1D IL2I IL2D no change
221 *
222 * There are some constrains and options, to decide mapping software bits
223 * into TLB entry.
224 *
225 * - PRESENT *must* be in the bottom three bits because swap cache
226 * entries use the top 29 bits for TLB2.
227 *
228 * - FILE *must* be in the bottom three bits because swap cache
229 * entries use the top 29 bits for TLB2.
230 *
231 * - CACHE COHERENT bit (M) has no effect on original PPC440 cores,
232 * because it doesn't support SMP. However, some later 460 variants
233 * have -some- form of SMP support and so I keep the bit there for
234 * future use
235 *
236 * With the PPC 44x Linux implementation, the 0-11th LSBs of the PTE are used
237 * for memory protection related functions (see PTE structure in
238 * include/asm-ppc/mmu.h). The _PAGE_XXX definitions in this file map to the
239 * above bits. Note that the bit values are CPU specific, not architecture
240 * specific.
241 *
242 * The kernel PTE entry holds an arch-dependent swp_entry structure under
243 * certain situations. In other words, in such situations some portion of
244 * the PTE bits are used as a swp_entry. In the PPC implementation, the
245 * 3-24th LSB are shared with swp_entry, however the 0-2nd three LSB still
246 * hold protection values. That means the three protection bits are
247 * reserved for both PTE and SWAP entry at the most significant three
248 * LSBs.
249 *
250 * There are three protection bits available for SWAP entry:
251 * _PAGE_PRESENT
252 * _PAGE_FILE
253 * _PAGE_HASHPTE (if HW has)
254 *
255 * So those three bits have to be inside of 0-2nd LSB of PTE.
256 *
257 */
258
259 #define _PAGE_PRESENT 0x00000001 /* S: PTE valid */
260 #define _PAGE_RW 0x00000002 /* S: Write permission */
261 #define _PAGE_FILE 0x00000004 /* S: nonlinear file mapping */
262 #define _PAGE_HWEXEC 0x00000004 /* H: Execute permission */
263 #define _PAGE_ACCESSED 0x00000008 /* S: Page referenced */
264 #define _PAGE_DIRTY 0x00000010 /* S: Page dirty */
265 #define _PAGE_SPECIAL 0x00000020 /* S: Special page */
266 #define _PAGE_USER 0x00000040 /* S: User page */
267 #define _PAGE_ENDIAN 0x00000080 /* H: E bit */
268 #define _PAGE_GUARDED 0x00000100 /* H: G bit */
269 #define _PAGE_COHERENT 0x00000200 /* H: M bit */
270 #define _PAGE_NO_CACHE 0x00000400 /* H: I bit */
271 #define _PAGE_WRITETHRU 0x00000800 /* H: W bit */
272
273 /* TODO: Add large page lowmem mapping support */
274 #define _PMD_PRESENT 0
275 #define _PMD_PRESENT_MASK (PAGE_MASK)
276 #define _PMD_BAD (~PAGE_MASK)
277
278 /* ERPN in a PTE never gets cleared, ignore it */
279 #define _PTE_NONE_MASK 0xffffffff00000000ULL
280
281 #define __HAVE_ARCH_PTE_SPECIAL
282
283 #elif defined(CONFIG_FSL_BOOKE)
284 /*
285 MMU Assist Register 3:
286
287 32 33 34 35 36 ... 50 51 52 53 54 55 56 57 58 59 60 61 62 63
288 RPN...................... 0 0 U0 U1 U2 U3 UX SX UW SW UR SR
289
290 - PRESENT *must* be in the bottom three bits because swap cache
291 entries use the top 29 bits.
292
293 - FILE *must* be in the bottom three bits because swap cache
294 entries use the top 29 bits.
295 */
296
297 /* Definitions for FSL Book-E Cores */
298 #define _PAGE_PRESENT 0x00001 /* S: PTE contains a translation */
299 #define _PAGE_USER 0x00002 /* S: User page (maps to UR) */
300 #define _PAGE_FILE 0x00002 /* S: when !present: nonlinear file mapping */
301 #define _PAGE_RW 0x00004 /* S: Write permission (SW) */
302 #define _PAGE_DIRTY 0x00008 /* S: Page dirty */
303 #define _PAGE_HWEXEC 0x00010 /* H: SX permission */
304 #define _PAGE_ACCESSED 0x00020 /* S: Page referenced */
305
306 #define _PAGE_ENDIAN 0x00040 /* H: E bit */
307 #define _PAGE_GUARDED 0x00080 /* H: G bit */
308 #define _PAGE_COHERENT 0x00100 /* H: M bit */
309 #define _PAGE_NO_CACHE 0x00200 /* H: I bit */
310 #define _PAGE_WRITETHRU 0x00400 /* H: W bit */
311 #define _PAGE_SPECIAL 0x00800 /* S: Special page */
312
313 #ifdef CONFIG_PTE_64BIT
314 /* ERPN in a PTE never gets cleared, ignore it */
315 #define _PTE_NONE_MASK 0xffffffffffff0000ULL
316 #endif
317
318 #define _PMD_PRESENT 0
319 #define _PMD_PRESENT_MASK (PAGE_MASK)
320 #define _PMD_BAD (~PAGE_MASK)
321
322 #define __HAVE_ARCH_PTE_SPECIAL
323
324 #elif defined(CONFIG_8xx)
325 /* Definitions for 8xx embedded chips. */
326 #define _PAGE_PRESENT 0x0001 /* Page is valid */
327 #define _PAGE_FILE 0x0002 /* when !present: nonlinear file mapping */
328 #define _PAGE_NO_CACHE 0x0002 /* I: cache inhibit */
329 #define _PAGE_SHARED 0x0004 /* No ASID (context) compare */
330
331 /* These five software bits must be masked out when the entry is loaded
332 * into the TLB.
333 */
334 #define _PAGE_EXEC 0x0008 /* software: i-cache coherency required */
335 #define _PAGE_GUARDED 0x0010 /* software: guarded access */
336 #define _PAGE_DIRTY 0x0020 /* software: page changed */
337 #define _PAGE_RW 0x0040 /* software: user write access allowed */
338 #define _PAGE_ACCESSED 0x0080 /* software: page referenced */
339
340 /* Setting any bits in the nibble with the follow two controls will
341 * require a TLB exception handler change. It is assumed unused bits
342 * are always zero.
343 */
344 #define _PAGE_HWWRITE 0x0100 /* h/w write enable: never set in Linux PTE */
345 #define _PAGE_USER 0x0800 /* One of the PP bits, the other is USER&~RW */
346
347 #define _PMD_PRESENT 0x0001
348 #define _PMD_BAD 0x0ff0
349 #define _PMD_PAGE_MASK 0x000c
350 #define _PMD_PAGE_8M 0x000c
351
352 #define _PTE_NONE_MASK _PAGE_ACCESSED
353
354 /* Until my rework is finished, 8xx still needs atomic PTE updates */
355 #define PTE_ATOMIC_UPDATES 1
356
357 #else /* CONFIG_6xx */
358 /* Definitions for 60x, 740/750, etc. */
359 #define _PAGE_PRESENT 0x001 /* software: pte contains a translation */
360 #define _PAGE_HASHPTE 0x002 /* hash_page has made an HPTE for this pte */
361 #define _PAGE_FILE 0x004 /* when !present: nonlinear file mapping */
362 #define _PAGE_USER 0x004 /* usermode access allowed */
363 #define _PAGE_GUARDED 0x008 /* G: prohibit speculative access */
364 #define _PAGE_COHERENT 0x010 /* M: enforce memory coherence (SMP systems) */
365 #define _PAGE_NO_CACHE 0x020 /* I: cache inhibit */
366 #define _PAGE_WRITETHRU 0x040 /* W: cache write-through */
367 #define _PAGE_DIRTY 0x080 /* C: page changed */
368 #define _PAGE_ACCESSED 0x100 /* R: page referenced */
369 #define _PAGE_EXEC 0x200 /* software: i-cache coherency required */
370 #define _PAGE_RW 0x400 /* software: user write access allowed */
371 #define _PAGE_SPECIAL 0x800 /* software: Special page */
372
373 #ifdef CONFIG_PTE_64BIT
374 /* We never clear the high word of the pte */
375 #define _PTE_NONE_MASK (0xffffffff00000000ULL | _PAGE_HASHPTE)
376 #else
377 #define _PTE_NONE_MASK _PAGE_HASHPTE
378 #endif
379
380 #define _PMD_PRESENT 0
381 #define _PMD_PRESENT_MASK (PAGE_MASK)
382 #define _PMD_BAD (~PAGE_MASK)
383
384 /* Hash table based platforms need atomic updates of the linux PTE */
385 #define PTE_ATOMIC_UPDATES 1
386
387 #define __HAVE_ARCH_PTE_SPECIAL
388
389 #endif
390
391 /*
392 * Some bits are only used on some cpu families...
393 */
394 #ifndef _PAGE_HASHPTE
395 #define _PAGE_HASHPTE 0
396 #endif
397 #ifndef _PTE_NONE_MASK
398 #define _PTE_NONE_MASK 0
399 #endif
400 #ifndef _PAGE_SHARED
401 #define _PAGE_SHARED 0
402 #endif
403 #ifndef _PAGE_HWWRITE
404 #define _PAGE_HWWRITE 0
405 #endif
406 #ifndef _PAGE_HWEXEC
407 #define _PAGE_HWEXEC 0
408 #endif
409 #ifndef _PAGE_EXEC
410 #define _PAGE_EXEC 0
411 #endif
412 #ifndef _PAGE_ENDIAN
413 #define _PAGE_ENDIAN 0
414 #endif
415 #ifndef _PAGE_COHERENT
416 #define _PAGE_COHERENT 0
417 #endif
418 #ifndef _PAGE_WRITETHRU
419 #define _PAGE_WRITETHRU 0
420 #endif
421 #ifndef _PAGE_SPECIAL
422 #define _PAGE_SPECIAL 0
423 #endif
424 #ifndef _PMD_PRESENT_MASK
425 #define _PMD_PRESENT_MASK _PMD_PRESENT
426 #endif
427 #ifndef _PMD_SIZE
428 #define _PMD_SIZE 0
429 #define PMD_PAGE_SIZE(pmd) bad_call_to_PMD_PAGE_SIZE()
430 #endif
431
432 #define _PAGE_CHG_MASK (PAGE_MASK | _PAGE_ACCESSED | _PAGE_DIRTY | \
433 _PAGE_SPECIAL)
434
435
436 #define PAGE_PROT_BITS (_PAGE_GUARDED | _PAGE_COHERENT | _PAGE_NO_CACHE | \
437 _PAGE_WRITETHRU | _PAGE_ENDIAN | \
438 _PAGE_USER | _PAGE_ACCESSED | \
439 _PAGE_RW | _PAGE_HWWRITE | _PAGE_DIRTY | \
440 _PAGE_EXEC | _PAGE_HWEXEC)
441
442 /*
443 * We define 2 sets of base prot bits, one for basic pages (ie,
444 * cacheable kernel and user pages) and one for non cacheable
445 * pages. We always set _PAGE_COHERENT when SMP is enabled or
446 * the processor might need it for DMA coherency.
447 */
448 #if defined(CONFIG_SMP) || defined(CONFIG_PPC_STD_MMU)
449 #define _PAGE_BASE (_PAGE_PRESENT | _PAGE_ACCESSED | _PAGE_COHERENT)
450 #else
451 #define _PAGE_BASE (_PAGE_PRESENT | _PAGE_ACCESSED)
452 #endif
453 #define _PAGE_BASE_NC (_PAGE_PRESENT | _PAGE_ACCESSED | _PAGE_NO_CACHE)
454
455 #define _PAGE_WRENABLE (_PAGE_RW | _PAGE_DIRTY | _PAGE_HWWRITE)
456 #define _PAGE_KERNEL (_PAGE_BASE | _PAGE_SHARED | _PAGE_WRENABLE)
457 #define _PAGE_KERNEL_NC (_PAGE_BASE_NC | _PAGE_SHARED | _PAGE_WRENABLE)
458
459 #ifdef CONFIG_PPC_STD_MMU
460 /* On standard PPC MMU, no user access implies kernel read/write access,
461 * so to write-protect kernel memory we must turn on user access */
462 #define _PAGE_KERNEL_RO (_PAGE_BASE | _PAGE_SHARED | _PAGE_USER)
463 #else
464 #define _PAGE_KERNEL_RO (_PAGE_BASE | _PAGE_SHARED)
465 #endif
466
467 #define _PAGE_IO (_PAGE_KERNEL_NC | _PAGE_GUARDED)
468 #define _PAGE_RAM (_PAGE_KERNEL | _PAGE_HWEXEC)
469
470 #if defined(CONFIG_KGDB) || defined(CONFIG_XMON) || defined(CONFIG_BDI_SWITCH) ||\
471 defined(CONFIG_KPROBES)
472 /* We want the debuggers to be able to set breakpoints anywhere, so
473 * don't write protect the kernel text */
474 #define _PAGE_RAM_TEXT _PAGE_RAM
475 #else
476 #define _PAGE_RAM_TEXT (_PAGE_KERNEL_RO | _PAGE_HWEXEC)
477 #endif
478
479 #define PAGE_NONE __pgprot(_PAGE_BASE)
480 #define PAGE_READONLY __pgprot(_PAGE_BASE | _PAGE_USER)
481 #define PAGE_READONLY_X __pgprot(_PAGE_BASE | _PAGE_USER | _PAGE_EXEC)
482 #define PAGE_SHARED __pgprot(_PAGE_BASE | _PAGE_USER | _PAGE_RW)
483 #define PAGE_SHARED_X __pgprot(_PAGE_BASE | _PAGE_USER | _PAGE_RW | _PAGE_EXEC)
484 #define PAGE_COPY __pgprot(_PAGE_BASE | _PAGE_USER)
485 #define PAGE_COPY_X __pgprot(_PAGE_BASE | _PAGE_USER | _PAGE_EXEC)
486
487 #define PAGE_KERNEL __pgprot(_PAGE_RAM)
488 #define PAGE_KERNEL_NOCACHE __pgprot(_PAGE_IO)
489
490 /*
491 * The PowerPC can only do execute protection on a segment (256MB) basis,
492 * not on a page basis. So we consider execute permission the same as read.
493 * Also, write permissions imply read permissions.
494 * This is the closest we can get..
495 */
496 #define __P000 PAGE_NONE
497 #define __P001 PAGE_READONLY_X
498 #define __P010 PAGE_COPY
499 #define __P011 PAGE_COPY_X
500 #define __P100 PAGE_READONLY
501 #define __P101 PAGE_READONLY_X
502 #define __P110 PAGE_COPY
503 #define __P111 PAGE_COPY_X
504
505 #define __S000 PAGE_NONE
506 #define __S001 PAGE_READONLY_X
507 #define __S010 PAGE_SHARED
508 #define __S011 PAGE_SHARED_X
509 #define __S100 PAGE_READONLY
510 #define __S101 PAGE_READONLY_X
511 #define __S110 PAGE_SHARED
512 #define __S111 PAGE_SHARED_X
513
514 #ifndef __ASSEMBLY__
515 /* Make sure we get a link error if PMD_PAGE_SIZE is ever called on a
516 * kernel without large page PMD support */
517 extern unsigned long bad_call_to_PMD_PAGE_SIZE(void);
518
519 /*
520 * Conversions between PTE values and page frame numbers.
521 */
522
523 /* in some case we want to additionaly adjust where the pfn is in the pte to
524 * allow room for more flags */
525 #if defined(CONFIG_FSL_BOOKE) && defined(CONFIG_PTE_64BIT)
526 #define PFN_SHIFT_OFFSET (PAGE_SHIFT + 8)
527 #else
528 #define PFN_SHIFT_OFFSET (PAGE_SHIFT)
529 #endif
530
531 #define pte_pfn(x) (pte_val(x) >> PFN_SHIFT_OFFSET)
532 #define pte_page(x) pfn_to_page(pte_pfn(x))
533
534 #define pfn_pte(pfn, prot) __pte(((pte_basic_t)(pfn) << PFN_SHIFT_OFFSET) |\
535 pgprot_val(prot))
536 #define mk_pte(page, prot) pfn_pte(page_to_pfn(page), prot)
537 #endif /* __ASSEMBLY__ */
538
539 #define pte_none(pte) ((pte_val(pte) & ~_PTE_NONE_MASK) == 0)
540 #define pte_present(pte) (pte_val(pte) & _PAGE_PRESENT)
541 #define pte_clear(mm, addr, ptep) \
542 do { pte_update(ptep, ~_PAGE_HASHPTE, 0); } while (0)
543
544 #define pmd_none(pmd) (!pmd_val(pmd))
545 #define pmd_bad(pmd) (pmd_val(pmd) & _PMD_BAD)
546 #define pmd_present(pmd) (pmd_val(pmd) & _PMD_PRESENT_MASK)
547 #define pmd_clear(pmdp) do { pmd_val(*(pmdp)) = 0; } while (0)
548
549 #ifndef __ASSEMBLY__
550 /*
551 * The following only work if pte_present() is true.
552 * Undefined behaviour if not..
553 */
pte_write(pte_t pte)554 static inline int pte_write(pte_t pte) { return pte_val(pte) & _PAGE_RW; }
pte_dirty(pte_t pte)555 static inline int pte_dirty(pte_t pte) { return pte_val(pte) & _PAGE_DIRTY; }
pte_young(pte_t pte)556 static inline int pte_young(pte_t pte) { return pte_val(pte) & _PAGE_ACCESSED; }
pte_file(pte_t pte)557 static inline int pte_file(pte_t pte) { return pte_val(pte) & _PAGE_FILE; }
pte_special(pte_t pte)558 static inline int pte_special(pte_t pte) { return pte_val(pte) & _PAGE_SPECIAL; }
559
pte_wrprotect(pte_t pte)560 static inline pte_t pte_wrprotect(pte_t pte) {
561 pte_val(pte) &= ~(_PAGE_RW | _PAGE_HWWRITE); return pte; }
pte_mkclean(pte_t pte)562 static inline pte_t pte_mkclean(pte_t pte) {
563 pte_val(pte) &= ~(_PAGE_DIRTY | _PAGE_HWWRITE); return pte; }
pte_mkold(pte_t pte)564 static inline pte_t pte_mkold(pte_t pte) {
565 pte_val(pte) &= ~_PAGE_ACCESSED; return pte; }
566
pte_mkwrite(pte_t pte)567 static inline pte_t pte_mkwrite(pte_t pte) {
568 pte_val(pte) |= _PAGE_RW; return pte; }
pte_mkdirty(pte_t pte)569 static inline pte_t pte_mkdirty(pte_t pte) {
570 pte_val(pte) |= _PAGE_DIRTY; return pte; }
pte_mkyoung(pte_t pte)571 static inline pte_t pte_mkyoung(pte_t pte) {
572 pte_val(pte) |= _PAGE_ACCESSED; return pte; }
pte_mkspecial(pte_t pte)573 static inline pte_t pte_mkspecial(pte_t pte) {
574 pte_val(pte) |= _PAGE_SPECIAL; return pte; }
pte_pgprot(pte_t pte)575 static inline pgprot_t pte_pgprot(pte_t pte)
576 {
577 return __pgprot(pte_val(pte) & PAGE_PROT_BITS);
578 }
579
pte_modify(pte_t pte,pgprot_t newprot)580 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
581 {
582 pte_val(pte) = (pte_val(pte) & _PAGE_CHG_MASK) | pgprot_val(newprot);
583 return pte;
584 }
585
586 /*
587 * When flushing the tlb entry for a page, we also need to flush the hash
588 * table entry. flush_hash_pages is assembler (for speed) in hashtable.S.
589 */
590 extern int flush_hash_pages(unsigned context, unsigned long va,
591 unsigned long pmdval, int count);
592
593 /* Add an HPTE to the hash table */
594 extern void add_hash_page(unsigned context, unsigned long va,
595 unsigned long pmdval);
596
597 /* Flush an entry from the TLB/hash table */
598 extern void flush_hash_entry(struct mm_struct *mm, pte_t *ptep,
599 unsigned long address);
600
601 /*
602 * Atomic PTE updates.
603 *
604 * pte_update clears and sets bit atomically, and returns
605 * the old pte value. In the 64-bit PTE case we lock around the
606 * low PTE word since we expect ALL flag bits to be there
607 */
608 #ifndef CONFIG_PTE_64BIT
pte_update(pte_t * p,unsigned long clr,unsigned long set)609 static inline unsigned long pte_update(pte_t *p,
610 unsigned long clr,
611 unsigned long set)
612 {
613 #ifdef PTE_ATOMIC_UPDATES
614 unsigned long old, tmp;
615
616 __asm__ __volatile__("\
617 1: lwarx %0,0,%3\n\
618 andc %1,%0,%4\n\
619 or %1,%1,%5\n"
620 PPC405_ERR77(0,%3)
621 " stwcx. %1,0,%3\n\
622 bne- 1b"
623 : "=&r" (old), "=&r" (tmp), "=m" (*p)
624 : "r" (p), "r" (clr), "r" (set), "m" (*p)
625 : "cc" );
626 #else /* PTE_ATOMIC_UPDATES */
627 unsigned long old = pte_val(*p);
628 *p = __pte((old & ~clr) | set);
629 #endif /* !PTE_ATOMIC_UPDATES */
630
631 #ifdef CONFIG_44x
632 if ((old & _PAGE_USER) && (old & _PAGE_HWEXEC))
633 icache_44x_need_flush = 1;
634 #endif
635 return old;
636 }
637 #else /* CONFIG_PTE_64BIT */
pte_update(pte_t * p,unsigned long clr,unsigned long set)638 static inline unsigned long long pte_update(pte_t *p,
639 unsigned long clr,
640 unsigned long set)
641 {
642 #ifdef PTE_ATOMIC_UPDATES
643 unsigned long long old;
644 unsigned long tmp;
645
646 __asm__ __volatile__("\
647 1: lwarx %L0,0,%4\n\
648 lwzx %0,0,%3\n\
649 andc %1,%L0,%5\n\
650 or %1,%1,%6\n"
651 PPC405_ERR77(0,%3)
652 " stwcx. %1,0,%4\n\
653 bne- 1b"
654 : "=&r" (old), "=&r" (tmp), "=m" (*p)
655 : "r" (p), "r" ((unsigned long)(p) + 4), "r" (clr), "r" (set), "m" (*p)
656 : "cc" );
657 #else /* PTE_ATOMIC_UPDATES */
658 unsigned long long old = pte_val(*p);
659 *p = __pte((old & ~(unsigned long long)clr) | set);
660 #endif /* !PTE_ATOMIC_UPDATES */
661
662 #ifdef CONFIG_44x
663 if ((old & _PAGE_USER) && (old & _PAGE_HWEXEC))
664 icache_44x_need_flush = 1;
665 #endif
666 return old;
667 }
668 #endif /* CONFIG_PTE_64BIT */
669
670 /*
671 * set_pte stores a linux PTE into the linux page table.
672 * On machines which use an MMU hash table we avoid changing the
673 * _PAGE_HASHPTE bit.
674 */
675
__set_pte_at(struct mm_struct * mm,unsigned long addr,pte_t * ptep,pte_t pte)676 static inline void __set_pte_at(struct mm_struct *mm, unsigned long addr,
677 pte_t *ptep, pte_t pte)
678 {
679 #if (_PAGE_HASHPTE != 0) && defined(CONFIG_SMP) && !defined(CONFIG_PTE_64BIT)
680 pte_update(ptep, ~_PAGE_HASHPTE, pte_val(pte) & ~_PAGE_HASHPTE);
681 #elif defined(CONFIG_PTE_64BIT) && defined(CONFIG_SMP)
682 #if _PAGE_HASHPTE != 0
683 if (pte_val(*ptep) & _PAGE_HASHPTE)
684 flush_hash_entry(mm, ptep, addr);
685 #endif
686 __asm__ __volatile__("\
687 stw%U0%X0 %2,%0\n\
688 eieio\n\
689 stw%U0%X0 %L2,%1"
690 : "=m" (*ptep), "=m" (*((unsigned char *)ptep+4))
691 : "r" (pte) : "memory");
692 #else
693 *ptep = __pte((pte_val(*ptep) & _PAGE_HASHPTE)
694 | (pte_val(pte) & ~_PAGE_HASHPTE));
695 #endif
696 }
697
698
set_pte_at(struct mm_struct * mm,unsigned long addr,pte_t * ptep,pte_t pte)699 static inline void set_pte_at(struct mm_struct *mm, unsigned long addr,
700 pte_t *ptep, pte_t pte)
701 {
702 #if defined(CONFIG_PTE_64BIT) && defined(CONFIG_SMP) && defined(CONFIG_DEBUG_VM)
703 WARN_ON(pte_present(*ptep));
704 #endif
705 __set_pte_at(mm, addr, ptep, pte);
706 }
707
708 /*
709 * 2.6 calls this without flushing the TLB entry; this is wrong
710 * for our hash-based implementation, we fix that up here.
711 */
712 #define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG
__ptep_test_and_clear_young(unsigned int context,unsigned long addr,pte_t * ptep)713 static inline int __ptep_test_and_clear_young(unsigned int context, unsigned long addr, pte_t *ptep)
714 {
715 unsigned long old;
716 old = pte_update(ptep, _PAGE_ACCESSED, 0);
717 #if _PAGE_HASHPTE != 0
718 if (old & _PAGE_HASHPTE) {
719 unsigned long ptephys = __pa(ptep) & PAGE_MASK;
720 flush_hash_pages(context, addr, ptephys, 1);
721 }
722 #endif
723 return (old & _PAGE_ACCESSED) != 0;
724 }
725 #define ptep_test_and_clear_young(__vma, __addr, __ptep) \
726 __ptep_test_and_clear_young((__vma)->vm_mm->context.id, __addr, __ptep)
727
728 #define __HAVE_ARCH_PTEP_GET_AND_CLEAR
ptep_get_and_clear(struct mm_struct * mm,unsigned long addr,pte_t * ptep)729 static inline pte_t ptep_get_and_clear(struct mm_struct *mm, unsigned long addr,
730 pte_t *ptep)
731 {
732 return __pte(pte_update(ptep, ~_PAGE_HASHPTE, 0));
733 }
734
735 #define __HAVE_ARCH_PTEP_SET_WRPROTECT
ptep_set_wrprotect(struct mm_struct * mm,unsigned long addr,pte_t * ptep)736 static inline void ptep_set_wrprotect(struct mm_struct *mm, unsigned long addr,
737 pte_t *ptep)
738 {
739 pte_update(ptep, (_PAGE_RW | _PAGE_HWWRITE), 0);
740 }
huge_ptep_set_wrprotect(struct mm_struct * mm,unsigned long addr,pte_t * ptep)741 static inline void huge_ptep_set_wrprotect(struct mm_struct *mm,
742 unsigned long addr, pte_t *ptep)
743 {
744 ptep_set_wrprotect(mm, addr, ptep);
745 }
746
747
748 #define __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS
__ptep_set_access_flags(pte_t * ptep,pte_t entry,int dirty)749 static inline void __ptep_set_access_flags(pte_t *ptep, pte_t entry, int dirty)
750 {
751 unsigned long bits = pte_val(entry) &
752 (_PAGE_DIRTY | _PAGE_ACCESSED | _PAGE_RW);
753 pte_update(ptep, 0, bits);
754 }
755
756 #define ptep_set_access_flags(__vma, __address, __ptep, __entry, __dirty) \
757 ({ \
758 int __changed = !pte_same(*(__ptep), __entry); \
759 if (__changed) { \
760 __ptep_set_access_flags(__ptep, __entry, __dirty); \
761 flush_tlb_page_nohash(__vma, __address); \
762 } \
763 __changed; \
764 })
765
766 #define __HAVE_ARCH_PTE_SAME
767 #define pte_same(A,B) (((pte_val(A) ^ pte_val(B)) & ~_PAGE_HASHPTE) == 0)
768
769 /*
770 * Note that on Book E processors, the pmd contains the kernel virtual
771 * (lowmem) address of the pte page. The physical address is less useful
772 * because everything runs with translation enabled (even the TLB miss
773 * handler). On everything else the pmd contains the physical address
774 * of the pte page. -- paulus
775 */
776 #ifndef CONFIG_BOOKE
777 #define pmd_page_vaddr(pmd) \
778 ((unsigned long) __va(pmd_val(pmd) & PAGE_MASK))
779 #define pmd_page(pmd) \
780 (mem_map + (pmd_val(pmd) >> PAGE_SHIFT))
781 #else
782 #define pmd_page_vaddr(pmd) \
783 ((unsigned long) (pmd_val(pmd) & PAGE_MASK))
784 #define pmd_page(pmd) \
785 pfn_to_page((__pa(pmd_val(pmd)) >> PAGE_SHIFT))
786 #endif
787
788 /* to find an entry in a kernel page-table-directory */
789 #define pgd_offset_k(address) pgd_offset(&init_mm, address)
790
791 /* to find an entry in a page-table-directory */
792 #define pgd_index(address) ((address) >> PGDIR_SHIFT)
793 #define pgd_offset(mm, address) ((mm)->pgd + pgd_index(address))
794
795 /* Find an entry in the third-level page table.. */
796 #define pte_index(address) \
797 (((address) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1))
798 #define pte_offset_kernel(dir, addr) \
799 ((pte_t *) pmd_page_vaddr(*(dir)) + pte_index(addr))
800 #define pte_offset_map(dir, addr) \
801 ((pte_t *) kmap_atomic(pmd_page(*(dir)), KM_PTE0) + pte_index(addr))
802 #define pte_offset_map_nested(dir, addr) \
803 ((pte_t *) kmap_atomic(pmd_page(*(dir)), KM_PTE1) + pte_index(addr))
804
805 #define pte_unmap(pte) kunmap_atomic(pte, KM_PTE0)
806 #define pte_unmap_nested(pte) kunmap_atomic(pte, KM_PTE1)
807
808 /*
809 * Encode and decode a swap entry.
810 * Note that the bits we use in a PTE for representing a swap entry
811 * must not include the _PAGE_PRESENT bit, the _PAGE_FILE bit, or the
812 *_PAGE_HASHPTE bit (if used). -- paulus
813 */
814 #define __swp_type(entry) ((entry).val & 0x1f)
815 #define __swp_offset(entry) ((entry).val >> 5)
816 #define __swp_entry(type, offset) ((swp_entry_t) { (type) | ((offset) << 5) })
817 #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) >> 3 })
818 #define __swp_entry_to_pte(x) ((pte_t) { (x).val << 3 })
819
820 /* Encode and decode a nonlinear file mapping entry */
821 #define PTE_FILE_MAX_BITS 29
822 #define pte_to_pgoff(pte) (pte_val(pte) >> 3)
823 #define pgoff_to_pte(off) ((pte_t) { ((off) << 3) | _PAGE_FILE })
824
825 /*
826 * No page table caches to initialise
827 */
828 #define pgtable_cache_init() do { } while (0)
829
830 extern int get_pteptr(struct mm_struct *mm, unsigned long addr, pte_t **ptep,
831 pmd_t **pmdp);
832
833 #endif /* !__ASSEMBLY__ */
834
835 #endif /* _ASM_POWERPC_PGTABLE_PPC32_H */
836