]>
Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * PPC64 (POWER4) Huge TLB Page Support for Kernel. | |
3 | * | |
4 | * Copyright (C) 2003 David Gibson, IBM Corporation. | |
5 | * | |
6 | * Based on the IA-32 version: | |
7 | * Copyright (C) 2002, Rohit Seth <rohit.seth@intel.com> | |
8 | */ | |
9 | ||
10 | #include <linux/init.h> | |
11 | #include <linux/fs.h> | |
12 | #include <linux/mm.h> | |
13 | #include <linux/hugetlb.h> | |
14 | #include <linux/pagemap.h> | |
1da177e4 LT |
15 | #include <linux/slab.h> |
16 | #include <linux/err.h> | |
17 | #include <linux/sysctl.h> | |
18 | #include <asm/mman.h> | |
19 | #include <asm/pgalloc.h> | |
20 | #include <asm/tlb.h> | |
21 | #include <asm/tlbflush.h> | |
22 | #include <asm/mmu_context.h> | |
23 | #include <asm/machdep.h> | |
24 | #include <asm/cputable.h> | |
25 | #include <asm/tlb.h> | |
94b2a439 | 26 | #include <asm/spu.h> |
1da177e4 LT |
27 | |
28 | #include <linux/sysctl.h> | |
29 | ||
c594adad DG |
30 | #define NUM_LOW_AREAS (0x100000000UL >> SID_SHIFT) |
31 | #define NUM_HIGH_AREAS (PGTABLE_RANGE >> HTLB_AREA_SHIFT) | |
32 | ||
f10a04c0 DG |
33 | #ifdef CONFIG_PPC_64K_PAGES |
34 | #define HUGEPTE_INDEX_SIZE (PMD_SHIFT-HPAGE_SHIFT) | |
35 | #else | |
36 | #define HUGEPTE_INDEX_SIZE (PUD_SHIFT-HPAGE_SHIFT) | |
37 | #endif | |
38 | #define PTRS_PER_HUGEPTE (1 << HUGEPTE_INDEX_SIZE) | |
39 | #define HUGEPTE_TABLE_SIZE (sizeof(pte_t) << HUGEPTE_INDEX_SIZE) | |
40 | ||
41 | #define HUGEPD_SHIFT (HPAGE_SHIFT + HUGEPTE_INDEX_SIZE) | |
42 | #define HUGEPD_SIZE (1UL << HUGEPD_SHIFT) | |
43 | #define HUGEPD_MASK (~(HUGEPD_SIZE-1)) | |
44 | ||
45 | #define huge_pgtable_cache (pgtable_cache[HUGEPTE_CACHE_NUM]) | |
46 | ||
47 | /* Flag to mark huge PD pointers. This means pmd_bad() and pud_bad() | |
48 | * will choke on pointers to hugepte tables, which is handy for | |
49 | * catching screwups early. */ | |
50 | #define HUGEPD_OK 0x1 | |
51 | ||
52 | typedef struct { unsigned long pd; } hugepd_t; | |
53 | ||
54 | #define hugepd_none(hpd) ((hpd).pd == 0) | |
55 | ||
56 | static inline pte_t *hugepd_page(hugepd_t hpd) | |
57 | { | |
58 | BUG_ON(!(hpd.pd & HUGEPD_OK)); | |
59 | return (pte_t *)(hpd.pd & ~HUGEPD_OK); | |
60 | } | |
61 | ||
62 | static inline pte_t *hugepte_offset(hugepd_t *hpdp, unsigned long addr) | |
63 | { | |
64 | unsigned long idx = ((addr >> HPAGE_SHIFT) & (PTRS_PER_HUGEPTE-1)); | |
65 | pte_t *dir = hugepd_page(*hpdp); | |
66 | ||
67 | return dir + idx; | |
68 | } | |
69 | ||
70 | static int __hugepte_alloc(struct mm_struct *mm, hugepd_t *hpdp, | |
71 | unsigned long address) | |
72 | { | |
73 | pte_t *new = kmem_cache_alloc(huge_pgtable_cache, | |
74 | GFP_KERNEL|__GFP_REPEAT); | |
75 | ||
76 | if (! new) | |
77 | return -ENOMEM; | |
78 | ||
79 | spin_lock(&mm->page_table_lock); | |
80 | if (!hugepd_none(*hpdp)) | |
81 | kmem_cache_free(huge_pgtable_cache, new); | |
82 | else | |
83 | hpdp->pd = (unsigned long)new | HUGEPD_OK; | |
84 | spin_unlock(&mm->page_table_lock); | |
85 | return 0; | |
86 | } | |
87 | ||
e28f7faf DG |
88 | /* Modelled after find_linux_pte() */ |
89 | pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr) | |
1da177e4 | 90 | { |
e28f7faf DG |
91 | pgd_t *pg; |
92 | pud_t *pu; | |
1da177e4 | 93 | |
d0f13e3c | 94 | BUG_ON(get_slice_psize(mm, addr) != mmu_huge_psize); |
1da177e4 | 95 | |
e28f7faf DG |
96 | addr &= HPAGE_MASK; |
97 | ||
98 | pg = pgd_offset(mm, addr); | |
99 | if (!pgd_none(*pg)) { | |
100 | pu = pud_offset(pg, addr); | |
101 | if (!pud_none(*pu)) { | |
3c726f8d | 102 | #ifdef CONFIG_PPC_64K_PAGES |
f10a04c0 DG |
103 | pmd_t *pm; |
104 | pm = pmd_offset(pu, addr); | |
105 | if (!pmd_none(*pm)) | |
106 | return hugepte_offset((hugepd_t *)pm, addr); | |
107 | #else | |
108 | return hugepte_offset((hugepd_t *)pu, addr); | |
109 | #endif | |
e28f7faf DG |
110 | } |
111 | } | |
1da177e4 | 112 | |
e28f7faf | 113 | return NULL; |
1da177e4 LT |
114 | } |
115 | ||
e28f7faf | 116 | pte_t *huge_pte_alloc(struct mm_struct *mm, unsigned long addr) |
1da177e4 | 117 | { |
e28f7faf DG |
118 | pgd_t *pg; |
119 | pud_t *pu; | |
f10a04c0 | 120 | hugepd_t *hpdp = NULL; |
1da177e4 | 121 | |
d0f13e3c | 122 | BUG_ON(get_slice_psize(mm, addr) != mmu_huge_psize); |
1da177e4 | 123 | |
e28f7faf | 124 | addr &= HPAGE_MASK; |
1da177e4 | 125 | |
e28f7faf DG |
126 | pg = pgd_offset(mm, addr); |
127 | pu = pud_alloc(mm, pg, addr); | |
1da177e4 | 128 | |
e28f7faf | 129 | if (pu) { |
f10a04c0 DG |
130 | #ifdef CONFIG_PPC_64K_PAGES |
131 | pmd_t *pm; | |
e28f7faf | 132 | pm = pmd_alloc(mm, pu, addr); |
f10a04c0 DG |
133 | if (pm) |
134 | hpdp = (hugepd_t *)pm; | |
135 | #else | |
136 | hpdp = (hugepd_t *)pu; | |
137 | #endif | |
138 | } | |
139 | ||
140 | if (! hpdp) | |
141 | return NULL; | |
142 | ||
143 | if (hugepd_none(*hpdp) && __hugepte_alloc(mm, hpdp, addr)) | |
144 | return NULL; | |
145 | ||
146 | return hugepte_offset(hpdp, addr); | |
147 | } | |
148 | ||
39dde65c KC |
149 | int huge_pmd_unshare(struct mm_struct *mm, unsigned long *addr, pte_t *ptep) |
150 | { | |
151 | return 0; | |
152 | } | |
153 | ||
f10a04c0 DG |
154 | static void free_hugepte_range(struct mmu_gather *tlb, hugepd_t *hpdp) |
155 | { | |
156 | pte_t *hugepte = hugepd_page(*hpdp); | |
157 | ||
158 | hpdp->pd = 0; | |
159 | tlb->need_flush = 1; | |
160 | pgtable_free_tlb(tlb, pgtable_free_cache(hugepte, HUGEPTE_CACHE_NUM, | |
c9169f87 | 161 | PGF_CACHENUM_MASK)); |
f10a04c0 DG |
162 | } |
163 | ||
3c726f8d | 164 | #ifdef CONFIG_PPC_64K_PAGES |
f10a04c0 DG |
165 | static void hugetlb_free_pmd_range(struct mmu_gather *tlb, pud_t *pud, |
166 | unsigned long addr, unsigned long end, | |
167 | unsigned long floor, unsigned long ceiling) | |
168 | { | |
169 | pmd_t *pmd; | |
170 | unsigned long next; | |
171 | unsigned long start; | |
172 | ||
173 | start = addr; | |
174 | pmd = pmd_offset(pud, addr); | |
175 | do { | |
176 | next = pmd_addr_end(addr, end); | |
177 | if (pmd_none(*pmd)) | |
178 | continue; | |
179 | free_hugepte_range(tlb, (hugepd_t *)pmd); | |
180 | } while (pmd++, addr = next, addr != end); | |
181 | ||
182 | start &= PUD_MASK; | |
183 | if (start < floor) | |
184 | return; | |
185 | if (ceiling) { | |
186 | ceiling &= PUD_MASK; | |
187 | if (!ceiling) | |
188 | return; | |
1da177e4 | 189 | } |
f10a04c0 DG |
190 | if (end - 1 > ceiling - 1) |
191 | return; | |
1da177e4 | 192 | |
f10a04c0 DG |
193 | pmd = pmd_offset(pud, start); |
194 | pud_clear(pud); | |
195 | pmd_free_tlb(tlb, pmd); | |
196 | } | |
197 | #endif | |
198 | ||
199 | static void hugetlb_free_pud_range(struct mmu_gather *tlb, pgd_t *pgd, | |
200 | unsigned long addr, unsigned long end, | |
201 | unsigned long floor, unsigned long ceiling) | |
202 | { | |
203 | pud_t *pud; | |
204 | unsigned long next; | |
205 | unsigned long start; | |
206 | ||
207 | start = addr; | |
208 | pud = pud_offset(pgd, addr); | |
209 | do { | |
210 | next = pud_addr_end(addr, end); | |
211 | #ifdef CONFIG_PPC_64K_PAGES | |
212 | if (pud_none_or_clear_bad(pud)) | |
213 | continue; | |
214 | hugetlb_free_pmd_range(tlb, pud, addr, next, floor, ceiling); | |
215 | #else | |
216 | if (pud_none(*pud)) | |
217 | continue; | |
218 | free_hugepte_range(tlb, (hugepd_t *)pud); | |
219 | #endif | |
220 | } while (pud++, addr = next, addr != end); | |
221 | ||
222 | start &= PGDIR_MASK; | |
223 | if (start < floor) | |
224 | return; | |
225 | if (ceiling) { | |
226 | ceiling &= PGDIR_MASK; | |
227 | if (!ceiling) | |
228 | return; | |
229 | } | |
230 | if (end - 1 > ceiling - 1) | |
231 | return; | |
232 | ||
233 | pud = pud_offset(pgd, start); | |
234 | pgd_clear(pgd); | |
235 | pud_free_tlb(tlb, pud); | |
236 | } | |
237 | ||
238 | /* | |
239 | * This function frees user-level page tables of a process. | |
240 | * | |
241 | * Must be called with pagetable lock held. | |
242 | */ | |
243 | void hugetlb_free_pgd_range(struct mmu_gather **tlb, | |
244 | unsigned long addr, unsigned long end, | |
245 | unsigned long floor, unsigned long ceiling) | |
246 | { | |
247 | pgd_t *pgd; | |
248 | unsigned long next; | |
249 | unsigned long start; | |
250 | ||
251 | /* | |
252 | * Comments below take from the normal free_pgd_range(). They | |
253 | * apply here too. The tests against HUGEPD_MASK below are | |
254 | * essential, because we *don't* test for this at the bottom | |
255 | * level. Without them we'll attempt to free a hugepte table | |
256 | * when we unmap just part of it, even if there are other | |
257 | * active mappings using it. | |
258 | * | |
259 | * The next few lines have given us lots of grief... | |
260 | * | |
261 | * Why are we testing HUGEPD* at this top level? Because | |
262 | * often there will be no work to do at all, and we'd prefer | |
263 | * not to go all the way down to the bottom just to discover | |
264 | * that. | |
265 | * | |
266 | * Why all these "- 1"s? Because 0 represents both the bottom | |
267 | * of the address space and the top of it (using -1 for the | |
268 | * top wouldn't help much: the masks would do the wrong thing). | |
269 | * The rule is that addr 0 and floor 0 refer to the bottom of | |
270 | * the address space, but end 0 and ceiling 0 refer to the top | |
271 | * Comparisons need to use "end - 1" and "ceiling - 1" (though | |
272 | * that end 0 case should be mythical). | |
273 | * | |
274 | * Wherever addr is brought up or ceiling brought down, we | |
275 | * must be careful to reject "the opposite 0" before it | |
276 | * confuses the subsequent tests. But what about where end is | |
277 | * brought down by HUGEPD_SIZE below? no, end can't go down to | |
278 | * 0 there. | |
279 | * | |
280 | * Whereas we round start (addr) and ceiling down, by different | |
281 | * masks at different levels, in order to test whether a table | |
282 | * now has no other vmas using it, so can be freed, we don't | |
283 | * bother to round floor or end up - the tests don't need that. | |
284 | */ | |
285 | ||
286 | addr &= HUGEPD_MASK; | |
287 | if (addr < floor) { | |
288 | addr += HUGEPD_SIZE; | |
289 | if (!addr) | |
290 | return; | |
291 | } | |
292 | if (ceiling) { | |
293 | ceiling &= HUGEPD_MASK; | |
294 | if (!ceiling) | |
295 | return; | |
296 | } | |
297 | if (end - 1 > ceiling - 1) | |
298 | end -= HUGEPD_SIZE; | |
299 | if (addr > end - 1) | |
300 | return; | |
301 | ||
302 | start = addr; | |
303 | pgd = pgd_offset((*tlb)->mm, addr); | |
304 | do { | |
d0f13e3c | 305 | BUG_ON(get_slice_psize((*tlb)->mm, addr) != mmu_huge_psize); |
f10a04c0 DG |
306 | next = pgd_addr_end(addr, end); |
307 | if (pgd_none_or_clear_bad(pgd)) | |
308 | continue; | |
309 | hugetlb_free_pud_range(*tlb, pgd, addr, next, floor, ceiling); | |
310 | } while (pgd++, addr = next, addr != end); | |
1da177e4 LT |
311 | } |
312 | ||
e28f7faf DG |
313 | void set_huge_pte_at(struct mm_struct *mm, unsigned long addr, |
314 | pte_t *ptep, pte_t pte) | |
315 | { | |
e28f7faf | 316 | if (pte_present(*ptep)) { |
3c726f8d | 317 | /* We open-code pte_clear because we need to pass the right |
a741e679 BH |
318 | * argument to hpte_need_flush (huge / !huge). Might not be |
319 | * necessary anymore if we make hpte_need_flush() get the | |
320 | * page size from the slices | |
3c726f8d | 321 | */ |
a741e679 | 322 | pte_update(mm, addr & HPAGE_MASK, ptep, ~0UL, 1); |
e28f7faf | 323 | } |
3c726f8d | 324 | *ptep = __pte(pte_val(pte) & ~_PAGE_HPTEFLAGS); |
1da177e4 LT |
325 | } |
326 | ||
e28f7faf DG |
327 | pte_t huge_ptep_get_and_clear(struct mm_struct *mm, unsigned long addr, |
328 | pte_t *ptep) | |
1da177e4 | 329 | { |
a741e679 | 330 | unsigned long old = pte_update(mm, addr, ptep, ~0UL, 1); |
e28f7faf | 331 | return __pte(old); |
1da177e4 LT |
332 | } |
333 | ||
1da177e4 LT |
334 | struct page * |
335 | follow_huge_addr(struct mm_struct *mm, unsigned long address, int write) | |
336 | { | |
337 | pte_t *ptep; | |
338 | struct page *page; | |
339 | ||
d0f13e3c | 340 | if (get_slice_psize(mm, address) != mmu_huge_psize) |
1da177e4 LT |
341 | return ERR_PTR(-EINVAL); |
342 | ||
343 | ptep = huge_pte_offset(mm, address); | |
344 | page = pte_page(*ptep); | |
345 | if (page) | |
346 | page += (address % HPAGE_SIZE) / PAGE_SIZE; | |
347 | ||
348 | return page; | |
349 | } | |
350 | ||
351 | int pmd_huge(pmd_t pmd) | |
352 | { | |
353 | return 0; | |
354 | } | |
355 | ||
356 | struct page * | |
357 | follow_huge_pmd(struct mm_struct *mm, unsigned long address, | |
358 | pmd_t *pmd, int write) | |
359 | { | |
360 | BUG(); | |
361 | return NULL; | |
362 | } | |
363 | ||
1da177e4 LT |
364 | |
365 | unsigned long hugetlb_get_unmapped_area(struct file *file, unsigned long addr, | |
366 | unsigned long len, unsigned long pgoff, | |
367 | unsigned long flags) | |
368 | { | |
d0f13e3c BH |
369 | return slice_get_unmapped_area(addr, len, flags, |
370 | mmu_huge_psize, 1, 0); | |
1da177e4 LT |
371 | } |
372 | ||
cbf52afd DG |
373 | /* |
374 | * Called by asm hashtable.S for doing lazy icache flush | |
375 | */ | |
376 | static unsigned int hash_huge_page_do_lazy_icache(unsigned long rflags, | |
377 | pte_t pte, int trap) | |
378 | { | |
379 | struct page *page; | |
380 | int i; | |
381 | ||
382 | if (!pfn_valid(pte_pfn(pte))) | |
383 | return rflags; | |
384 | ||
385 | page = pte_page(pte); | |
386 | ||
387 | /* page is dirty */ | |
388 | if (!test_bit(PG_arch_1, &page->flags) && !PageReserved(page)) { | |
389 | if (trap == 0x400) { | |
390 | for (i = 0; i < (HPAGE_SIZE / PAGE_SIZE); i++) | |
391 | __flush_dcache_icache(page_address(page+i)); | |
392 | set_bit(PG_arch_1, &page->flags); | |
393 | } else { | |
394 | rflags |= HPTE_R_N; | |
395 | } | |
396 | } | |
397 | return rflags; | |
398 | } | |
399 | ||
1da177e4 | 400 | int hash_huge_page(struct mm_struct *mm, unsigned long access, |
cbf52afd DG |
401 | unsigned long ea, unsigned long vsid, int local, |
402 | unsigned long trap) | |
1da177e4 LT |
403 | { |
404 | pte_t *ptep; | |
3c726f8d BH |
405 | unsigned long old_pte, new_pte; |
406 | unsigned long va, rflags, pa; | |
1da177e4 LT |
407 | long slot; |
408 | int err = 1; | |
409 | ||
1da177e4 LT |
410 | ptep = huge_pte_offset(mm, ea); |
411 | ||
412 | /* Search the Linux page table for a match with va */ | |
413 | va = (vsid << 28) | (ea & 0x0fffffff); | |
1da177e4 LT |
414 | |
415 | /* | |
416 | * If no pte found or not present, send the problem up to | |
417 | * do_page_fault | |
418 | */ | |
419 | if (unlikely(!ptep || pte_none(*ptep))) | |
420 | goto out; | |
421 | ||
1da177e4 LT |
422 | /* |
423 | * Check the user's access rights to the page. If access should be | |
424 | * prevented then send the problem up to do_page_fault. | |
425 | */ | |
426 | if (unlikely(access & ~pte_val(*ptep))) | |
427 | goto out; | |
428 | /* | |
429 | * At this point, we have a pte (old_pte) which can be used to build | |
430 | * or update an HPTE. There are 2 cases: | |
431 | * | |
432 | * 1. There is a valid (present) pte with no associated HPTE (this is | |
433 | * the most common case) | |
434 | * 2. There is a valid (present) pte with an associated HPTE. The | |
435 | * current values of the pp bits in the HPTE prevent access | |
436 | * because we are doing software DIRTY bit management and the | |
437 | * page is currently not DIRTY. | |
438 | */ | |
439 | ||
440 | ||
3c726f8d BH |
441 | do { |
442 | old_pte = pte_val(*ptep); | |
443 | if (old_pte & _PAGE_BUSY) | |
444 | goto out; | |
445 | new_pte = old_pte | _PAGE_BUSY | | |
446 | _PAGE_ACCESSED | _PAGE_HASHPTE; | |
447 | } while(old_pte != __cmpxchg_u64((unsigned long *)ptep, | |
448 | old_pte, new_pte)); | |
449 | ||
450 | rflags = 0x2 | (!(new_pte & _PAGE_RW)); | |
1da177e4 | 451 | /* _PAGE_EXEC -> HW_NO_EXEC since it's inverted */ |
3c726f8d | 452 | rflags |= ((new_pte & _PAGE_EXEC) ? 0 : HPTE_R_N); |
cbf52afd DG |
453 | if (!cpu_has_feature(CPU_FTR_COHERENT_ICACHE)) |
454 | /* No CPU has hugepages but lacks no execute, so we | |
455 | * don't need to worry about that case */ | |
456 | rflags = hash_huge_page_do_lazy_icache(rflags, __pte(old_pte), | |
457 | trap); | |
1da177e4 LT |
458 | |
459 | /* Check if pte already has an hpte (case 2) */ | |
3c726f8d | 460 | if (unlikely(old_pte & _PAGE_HASHPTE)) { |
1da177e4 LT |
461 | /* There MIGHT be an HPTE for this pte */ |
462 | unsigned long hash, slot; | |
463 | ||
3c726f8d BH |
464 | hash = hpt_hash(va, HPAGE_SHIFT); |
465 | if (old_pte & _PAGE_F_SECOND) | |
1da177e4 LT |
466 | hash = ~hash; |
467 | slot = (hash & htab_hash_mask) * HPTES_PER_GROUP; | |
3c726f8d | 468 | slot += (old_pte & _PAGE_F_GIX) >> 12; |
1da177e4 | 469 | |
325c82a0 BH |
470 | if (ppc_md.hpte_updatepp(slot, rflags, va, mmu_huge_psize, |
471 | local) == -1) | |
3c726f8d | 472 | old_pte &= ~_PAGE_HPTEFLAGS; |
1da177e4 LT |
473 | } |
474 | ||
3c726f8d BH |
475 | if (likely(!(old_pte & _PAGE_HASHPTE))) { |
476 | unsigned long hash = hpt_hash(va, HPAGE_SHIFT); | |
1da177e4 LT |
477 | unsigned long hpte_group; |
478 | ||
3c726f8d | 479 | pa = pte_pfn(__pte(old_pte)) << PAGE_SHIFT; |
1da177e4 LT |
480 | |
481 | repeat: | |
482 | hpte_group = ((hash & htab_hash_mask) * | |
483 | HPTES_PER_GROUP) & ~0x7UL; | |
484 | ||
3c726f8d BH |
485 | /* clear HPTE slot informations in new PTE */ |
486 | new_pte = (new_pte & ~_PAGE_HPTEFLAGS) | _PAGE_HASHPTE; | |
1da177e4 LT |
487 | |
488 | /* Add in WIMG bits */ | |
489 | /* XXX We should store these in the pte */ | |
3c726f8d | 490 | /* --BenH: I think they are ... */ |
96e28449 | 491 | rflags |= _PAGE_COHERENT; |
1da177e4 | 492 | |
3c726f8d BH |
493 | /* Insert into the hash table, primary slot */ |
494 | slot = ppc_md.hpte_insert(hpte_group, va, pa, rflags, 0, | |
495 | mmu_huge_psize); | |
1da177e4 LT |
496 | |
497 | /* Primary is full, try the secondary */ | |
498 | if (unlikely(slot == -1)) { | |
1da177e4 LT |
499 | hpte_group = ((~hash & htab_hash_mask) * |
500 | HPTES_PER_GROUP) & ~0x7UL; | |
3c726f8d | 501 | slot = ppc_md.hpte_insert(hpte_group, va, pa, rflags, |
67b10813 | 502 | HPTE_V_SECONDARY, |
3c726f8d | 503 | mmu_huge_psize); |
1da177e4 LT |
504 | if (slot == -1) { |
505 | if (mftb() & 0x1) | |
67b10813 BH |
506 | hpte_group = ((hash & htab_hash_mask) * |
507 | HPTES_PER_GROUP)&~0x7UL; | |
1da177e4 LT |
508 | |
509 | ppc_md.hpte_remove(hpte_group); | |
510 | goto repeat; | |
511 | } | |
512 | } | |
513 | ||
514 | if (unlikely(slot == -2)) | |
515 | panic("hash_huge_page: pte_insert failed\n"); | |
516 | ||
d649bd7b | 517 | new_pte |= (slot << 12) & (_PAGE_F_SECOND | _PAGE_F_GIX); |
1da177e4 LT |
518 | } |
519 | ||
3c726f8d | 520 | /* |
01edcd89 | 521 | * No need to use ldarx/stdcx here |
3c726f8d BH |
522 | */ |
523 | *ptep = __pte(new_pte & ~_PAGE_BUSY); | |
524 | ||
1da177e4 LT |
525 | err = 0; |
526 | ||
527 | out: | |
1da177e4 LT |
528 | return err; |
529 | } | |
f10a04c0 | 530 | |
e18b890b | 531 | static void zero_ctor(void *addr, struct kmem_cache *cache, unsigned long flags) |
f10a04c0 DG |
532 | { |
533 | memset(addr, 0, kmem_cache_size(cache)); | |
534 | } | |
535 | ||
536 | static int __init hugetlbpage_init(void) | |
537 | { | |
538 | if (!cpu_has_feature(CPU_FTR_16M_PAGE)) | |
539 | return -ENODEV; | |
540 | ||
541 | huge_pgtable_cache = kmem_cache_create("hugepte_cache", | |
542 | HUGEPTE_TABLE_SIZE, | |
543 | HUGEPTE_TABLE_SIZE, | |
f0f3980b | 544 | 0, |
20c2df83 | 545 | zero_ctor); |
f10a04c0 DG |
546 | if (! huge_pgtable_cache) |
547 | panic("hugetlbpage_init(): could not create hugepte cache\n"); | |
548 | ||
549 | return 0; | |
550 | } | |
551 | ||
552 | module_init(hugetlbpage_init); |