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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> | |
94b2a439 | 25 | #include <asm/spu.h> |
1da177e4 | 26 | |
c594adad DG |
27 | #define NUM_LOW_AREAS (0x100000000UL >> SID_SHIFT) |
28 | #define NUM_HIGH_AREAS (PGTABLE_RANGE >> HTLB_AREA_SHIFT) | |
29 | ||
f10a04c0 DG |
30 | #ifdef CONFIG_PPC_64K_PAGES |
31 | #define HUGEPTE_INDEX_SIZE (PMD_SHIFT-HPAGE_SHIFT) | |
32 | #else | |
33 | #define HUGEPTE_INDEX_SIZE (PUD_SHIFT-HPAGE_SHIFT) | |
34 | #endif | |
35 | #define PTRS_PER_HUGEPTE (1 << HUGEPTE_INDEX_SIZE) | |
36 | #define HUGEPTE_TABLE_SIZE (sizeof(pte_t) << HUGEPTE_INDEX_SIZE) | |
37 | ||
38 | #define HUGEPD_SHIFT (HPAGE_SHIFT + HUGEPTE_INDEX_SIZE) | |
39 | #define HUGEPD_SIZE (1UL << HUGEPD_SHIFT) | |
40 | #define HUGEPD_MASK (~(HUGEPD_SIZE-1)) | |
41 | ||
42 | #define huge_pgtable_cache (pgtable_cache[HUGEPTE_CACHE_NUM]) | |
43 | ||
44 | /* Flag to mark huge PD pointers. This means pmd_bad() and pud_bad() | |
45 | * will choke on pointers to hugepte tables, which is handy for | |
46 | * catching screwups early. */ | |
47 | #define HUGEPD_OK 0x1 | |
48 | ||
49 | typedef struct { unsigned long pd; } hugepd_t; | |
50 | ||
51 | #define hugepd_none(hpd) ((hpd).pd == 0) | |
52 | ||
53 | static inline pte_t *hugepd_page(hugepd_t hpd) | |
54 | { | |
55 | BUG_ON(!(hpd.pd & HUGEPD_OK)); | |
56 | return (pte_t *)(hpd.pd & ~HUGEPD_OK); | |
57 | } | |
58 | ||
59 | static inline pte_t *hugepte_offset(hugepd_t *hpdp, unsigned long addr) | |
60 | { | |
61 | unsigned long idx = ((addr >> HPAGE_SHIFT) & (PTRS_PER_HUGEPTE-1)); | |
62 | pte_t *dir = hugepd_page(*hpdp); | |
63 | ||
64 | return dir + idx; | |
65 | } | |
66 | ||
67 | static int __hugepte_alloc(struct mm_struct *mm, hugepd_t *hpdp, | |
68 | unsigned long address) | |
69 | { | |
70 | pte_t *new = kmem_cache_alloc(huge_pgtable_cache, | |
71 | GFP_KERNEL|__GFP_REPEAT); | |
72 | ||
73 | if (! new) | |
74 | return -ENOMEM; | |
75 | ||
76 | spin_lock(&mm->page_table_lock); | |
77 | if (!hugepd_none(*hpdp)) | |
78 | kmem_cache_free(huge_pgtable_cache, new); | |
79 | else | |
80 | hpdp->pd = (unsigned long)new | HUGEPD_OK; | |
81 | spin_unlock(&mm->page_table_lock); | |
82 | return 0; | |
83 | } | |
84 | ||
e28f7faf DG |
85 | /* Modelled after find_linux_pte() */ |
86 | pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr) | |
1da177e4 | 87 | { |
e28f7faf DG |
88 | pgd_t *pg; |
89 | pud_t *pu; | |
1da177e4 | 90 | |
d0f13e3c | 91 | BUG_ON(get_slice_psize(mm, addr) != mmu_huge_psize); |
1da177e4 | 92 | |
e28f7faf DG |
93 | addr &= HPAGE_MASK; |
94 | ||
95 | pg = pgd_offset(mm, addr); | |
96 | if (!pgd_none(*pg)) { | |
97 | pu = pud_offset(pg, addr); | |
98 | if (!pud_none(*pu)) { | |
3c726f8d | 99 | #ifdef CONFIG_PPC_64K_PAGES |
f10a04c0 DG |
100 | pmd_t *pm; |
101 | pm = pmd_offset(pu, addr); | |
102 | if (!pmd_none(*pm)) | |
103 | return hugepte_offset((hugepd_t *)pm, addr); | |
104 | #else | |
105 | return hugepte_offset((hugepd_t *)pu, addr); | |
106 | #endif | |
e28f7faf DG |
107 | } |
108 | } | |
1da177e4 | 109 | |
e28f7faf | 110 | return NULL; |
1da177e4 LT |
111 | } |
112 | ||
e28f7faf | 113 | pte_t *huge_pte_alloc(struct mm_struct *mm, unsigned long addr) |
1da177e4 | 114 | { |
e28f7faf DG |
115 | pgd_t *pg; |
116 | pud_t *pu; | |
f10a04c0 | 117 | hugepd_t *hpdp = NULL; |
1da177e4 | 118 | |
d0f13e3c | 119 | BUG_ON(get_slice_psize(mm, addr) != mmu_huge_psize); |
1da177e4 | 120 | |
e28f7faf | 121 | addr &= HPAGE_MASK; |
1da177e4 | 122 | |
e28f7faf DG |
123 | pg = pgd_offset(mm, addr); |
124 | pu = pud_alloc(mm, pg, addr); | |
1da177e4 | 125 | |
e28f7faf | 126 | if (pu) { |
f10a04c0 DG |
127 | #ifdef CONFIG_PPC_64K_PAGES |
128 | pmd_t *pm; | |
e28f7faf | 129 | pm = pmd_alloc(mm, pu, addr); |
f10a04c0 DG |
130 | if (pm) |
131 | hpdp = (hugepd_t *)pm; | |
132 | #else | |
133 | hpdp = (hugepd_t *)pu; | |
134 | #endif | |
135 | } | |
136 | ||
137 | if (! hpdp) | |
138 | return NULL; | |
139 | ||
140 | if (hugepd_none(*hpdp) && __hugepte_alloc(mm, hpdp, addr)) | |
141 | return NULL; | |
142 | ||
143 | return hugepte_offset(hpdp, addr); | |
144 | } | |
145 | ||
39dde65c CK |
146 | int huge_pmd_unshare(struct mm_struct *mm, unsigned long *addr, pte_t *ptep) |
147 | { | |
148 | return 0; | |
149 | } | |
150 | ||
f10a04c0 DG |
151 | static void free_hugepte_range(struct mmu_gather *tlb, hugepd_t *hpdp) |
152 | { | |
153 | pte_t *hugepte = hugepd_page(*hpdp); | |
154 | ||
155 | hpdp->pd = 0; | |
156 | tlb->need_flush = 1; | |
157 | pgtable_free_tlb(tlb, pgtable_free_cache(hugepte, HUGEPTE_CACHE_NUM, | |
c9169f87 | 158 | PGF_CACHENUM_MASK)); |
f10a04c0 DG |
159 | } |
160 | ||
3c726f8d | 161 | #ifdef CONFIG_PPC_64K_PAGES |
f10a04c0 DG |
162 | static void hugetlb_free_pmd_range(struct mmu_gather *tlb, pud_t *pud, |
163 | unsigned long addr, unsigned long end, | |
164 | unsigned long floor, unsigned long ceiling) | |
165 | { | |
166 | pmd_t *pmd; | |
167 | unsigned long next; | |
168 | unsigned long start; | |
169 | ||
170 | start = addr; | |
171 | pmd = pmd_offset(pud, addr); | |
172 | do { | |
173 | next = pmd_addr_end(addr, end); | |
174 | if (pmd_none(*pmd)) | |
175 | continue; | |
176 | free_hugepte_range(tlb, (hugepd_t *)pmd); | |
177 | } while (pmd++, addr = next, addr != end); | |
178 | ||
179 | start &= PUD_MASK; | |
180 | if (start < floor) | |
181 | return; | |
182 | if (ceiling) { | |
183 | ceiling &= PUD_MASK; | |
184 | if (!ceiling) | |
185 | return; | |
1da177e4 | 186 | } |
f10a04c0 DG |
187 | if (end - 1 > ceiling - 1) |
188 | return; | |
1da177e4 | 189 | |
f10a04c0 DG |
190 | pmd = pmd_offset(pud, start); |
191 | pud_clear(pud); | |
192 | pmd_free_tlb(tlb, pmd); | |
193 | } | |
194 | #endif | |
195 | ||
196 | static void hugetlb_free_pud_range(struct mmu_gather *tlb, pgd_t *pgd, | |
197 | unsigned long addr, unsigned long end, | |
198 | unsigned long floor, unsigned long ceiling) | |
199 | { | |
200 | pud_t *pud; | |
201 | unsigned long next; | |
202 | unsigned long start; | |
203 | ||
204 | start = addr; | |
205 | pud = pud_offset(pgd, addr); | |
206 | do { | |
207 | next = pud_addr_end(addr, end); | |
208 | #ifdef CONFIG_PPC_64K_PAGES | |
209 | if (pud_none_or_clear_bad(pud)) | |
210 | continue; | |
211 | hugetlb_free_pmd_range(tlb, pud, addr, next, floor, ceiling); | |
212 | #else | |
213 | if (pud_none(*pud)) | |
214 | continue; | |
215 | free_hugepte_range(tlb, (hugepd_t *)pud); | |
216 | #endif | |
217 | } while (pud++, addr = next, addr != end); | |
218 | ||
219 | start &= PGDIR_MASK; | |
220 | if (start < floor) | |
221 | return; | |
222 | if (ceiling) { | |
223 | ceiling &= PGDIR_MASK; | |
224 | if (!ceiling) | |
225 | return; | |
226 | } | |
227 | if (end - 1 > ceiling - 1) | |
228 | return; | |
229 | ||
230 | pud = pud_offset(pgd, start); | |
231 | pgd_clear(pgd); | |
232 | pud_free_tlb(tlb, pud); | |
233 | } | |
234 | ||
235 | /* | |
236 | * This function frees user-level page tables of a process. | |
237 | * | |
238 | * Must be called with pagetable lock held. | |
239 | */ | |
240 | void hugetlb_free_pgd_range(struct mmu_gather **tlb, | |
241 | unsigned long addr, unsigned long end, | |
242 | unsigned long floor, unsigned long ceiling) | |
243 | { | |
244 | pgd_t *pgd; | |
245 | unsigned long next; | |
246 | unsigned long start; | |
247 | ||
248 | /* | |
249 | * Comments below take from the normal free_pgd_range(). They | |
250 | * apply here too. The tests against HUGEPD_MASK below are | |
251 | * essential, because we *don't* test for this at the bottom | |
252 | * level. Without them we'll attempt to free a hugepte table | |
253 | * when we unmap just part of it, even if there are other | |
254 | * active mappings using it. | |
255 | * | |
256 | * The next few lines have given us lots of grief... | |
257 | * | |
258 | * Why are we testing HUGEPD* at this top level? Because | |
259 | * often there will be no work to do at all, and we'd prefer | |
260 | * not to go all the way down to the bottom just to discover | |
261 | * that. | |
262 | * | |
263 | * Why all these "- 1"s? Because 0 represents both the bottom | |
264 | * of the address space and the top of it (using -1 for the | |
265 | * top wouldn't help much: the masks would do the wrong thing). | |
266 | * The rule is that addr 0 and floor 0 refer to the bottom of | |
267 | * the address space, but end 0 and ceiling 0 refer to the top | |
268 | * Comparisons need to use "end - 1" and "ceiling - 1" (though | |
269 | * that end 0 case should be mythical). | |
270 | * | |
271 | * Wherever addr is brought up or ceiling brought down, we | |
272 | * must be careful to reject "the opposite 0" before it | |
273 | * confuses the subsequent tests. But what about where end is | |
274 | * brought down by HUGEPD_SIZE below? no, end can't go down to | |
275 | * 0 there. | |
276 | * | |
277 | * Whereas we round start (addr) and ceiling down, by different | |
278 | * masks at different levels, in order to test whether a table | |
279 | * now has no other vmas using it, so can be freed, we don't | |
280 | * bother to round floor or end up - the tests don't need that. | |
281 | */ | |
282 | ||
283 | addr &= HUGEPD_MASK; | |
284 | if (addr < floor) { | |
285 | addr += HUGEPD_SIZE; | |
286 | if (!addr) | |
287 | return; | |
288 | } | |
289 | if (ceiling) { | |
290 | ceiling &= HUGEPD_MASK; | |
291 | if (!ceiling) | |
292 | return; | |
293 | } | |
294 | if (end - 1 > ceiling - 1) | |
295 | end -= HUGEPD_SIZE; | |
296 | if (addr > end - 1) | |
297 | return; | |
298 | ||
299 | start = addr; | |
300 | pgd = pgd_offset((*tlb)->mm, addr); | |
301 | do { | |
d0f13e3c | 302 | BUG_ON(get_slice_psize((*tlb)->mm, addr) != mmu_huge_psize); |
f10a04c0 DG |
303 | next = pgd_addr_end(addr, end); |
304 | if (pgd_none_or_clear_bad(pgd)) | |
305 | continue; | |
306 | hugetlb_free_pud_range(*tlb, pgd, addr, next, floor, ceiling); | |
307 | } while (pgd++, addr = next, addr != end); | |
1da177e4 LT |
308 | } |
309 | ||
e28f7faf DG |
310 | void set_huge_pte_at(struct mm_struct *mm, unsigned long addr, |
311 | pte_t *ptep, pte_t pte) | |
312 | { | |
e28f7faf | 313 | if (pte_present(*ptep)) { |
3c726f8d | 314 | /* We open-code pte_clear because we need to pass the right |
a741e679 BH |
315 | * argument to hpte_need_flush (huge / !huge). Might not be |
316 | * necessary anymore if we make hpte_need_flush() get the | |
317 | * page size from the slices | |
3c726f8d | 318 | */ |
a741e679 | 319 | pte_update(mm, addr & HPAGE_MASK, ptep, ~0UL, 1); |
e28f7faf | 320 | } |
3c726f8d | 321 | *ptep = __pte(pte_val(pte) & ~_PAGE_HPTEFLAGS); |
1da177e4 LT |
322 | } |
323 | ||
e28f7faf DG |
324 | pte_t huge_ptep_get_and_clear(struct mm_struct *mm, unsigned long addr, |
325 | pte_t *ptep) | |
1da177e4 | 326 | { |
a741e679 | 327 | unsigned long old = pte_update(mm, addr, ptep, ~0UL, 1); |
e28f7faf | 328 | return __pte(old); |
1da177e4 LT |
329 | } |
330 | ||
1da177e4 LT |
331 | struct page * |
332 | follow_huge_addr(struct mm_struct *mm, unsigned long address, int write) | |
333 | { | |
334 | pte_t *ptep; | |
335 | struct page *page; | |
336 | ||
d0f13e3c | 337 | if (get_slice_psize(mm, address) != mmu_huge_psize) |
1da177e4 LT |
338 | return ERR_PTR(-EINVAL); |
339 | ||
340 | ptep = huge_pte_offset(mm, address); | |
341 | page = pte_page(*ptep); | |
342 | if (page) | |
343 | page += (address % HPAGE_SIZE) / PAGE_SIZE; | |
344 | ||
345 | return page; | |
346 | } | |
347 | ||
348 | int pmd_huge(pmd_t pmd) | |
349 | { | |
350 | return 0; | |
351 | } | |
352 | ||
353 | struct page * | |
354 | follow_huge_pmd(struct mm_struct *mm, unsigned long address, | |
355 | pmd_t *pmd, int write) | |
356 | { | |
357 | BUG(); | |
358 | return NULL; | |
359 | } | |
360 | ||
1da177e4 LT |
361 | |
362 | unsigned long hugetlb_get_unmapped_area(struct file *file, unsigned long addr, | |
363 | unsigned long len, unsigned long pgoff, | |
364 | unsigned long flags) | |
365 | { | |
d0f13e3c BH |
366 | return slice_get_unmapped_area(addr, len, flags, |
367 | mmu_huge_psize, 1, 0); | |
1da177e4 LT |
368 | } |
369 | ||
cbf52afd DG |
370 | /* |
371 | * Called by asm hashtable.S for doing lazy icache flush | |
372 | */ | |
373 | static unsigned int hash_huge_page_do_lazy_icache(unsigned long rflags, | |
374 | pte_t pte, int trap) | |
375 | { | |
376 | struct page *page; | |
377 | int i; | |
378 | ||
379 | if (!pfn_valid(pte_pfn(pte))) | |
380 | return rflags; | |
381 | ||
382 | page = pte_page(pte); | |
383 | ||
384 | /* page is dirty */ | |
385 | if (!test_bit(PG_arch_1, &page->flags) && !PageReserved(page)) { | |
386 | if (trap == 0x400) { | |
387 | for (i = 0; i < (HPAGE_SIZE / PAGE_SIZE); i++) | |
388 | __flush_dcache_icache(page_address(page+i)); | |
389 | set_bit(PG_arch_1, &page->flags); | |
390 | } else { | |
391 | rflags |= HPTE_R_N; | |
392 | } | |
393 | } | |
394 | return rflags; | |
395 | } | |
396 | ||
1da177e4 | 397 | int hash_huge_page(struct mm_struct *mm, unsigned long access, |
cbf52afd DG |
398 | unsigned long ea, unsigned long vsid, int local, |
399 | unsigned long trap) | |
1da177e4 LT |
400 | { |
401 | pte_t *ptep; | |
3c726f8d BH |
402 | unsigned long old_pte, new_pte; |
403 | unsigned long va, rflags, pa; | |
1da177e4 LT |
404 | long slot; |
405 | int err = 1; | |
1189be65 | 406 | int ssize = user_segment_size(ea); |
1da177e4 | 407 | |
1da177e4 LT |
408 | ptep = huge_pte_offset(mm, ea); |
409 | ||
410 | /* Search the Linux page table for a match with va */ | |
1189be65 | 411 | va = hpt_va(ea, vsid, ssize); |
1da177e4 LT |
412 | |
413 | /* | |
414 | * If no pte found or not present, send the problem up to | |
415 | * do_page_fault | |
416 | */ | |
417 | if (unlikely(!ptep || pte_none(*ptep))) | |
418 | goto out; | |
419 | ||
1da177e4 LT |
420 | /* |
421 | * Check the user's access rights to the page. If access should be | |
422 | * prevented then send the problem up to do_page_fault. | |
423 | */ | |
424 | if (unlikely(access & ~pte_val(*ptep))) | |
425 | goto out; | |
426 | /* | |
427 | * At this point, we have a pte (old_pte) which can be used to build | |
428 | * or update an HPTE. There are 2 cases: | |
429 | * | |
430 | * 1. There is a valid (present) pte with no associated HPTE (this is | |
431 | * the most common case) | |
432 | * 2. There is a valid (present) pte with an associated HPTE. The | |
433 | * current values of the pp bits in the HPTE prevent access | |
434 | * because we are doing software DIRTY bit management and the | |
435 | * page is currently not DIRTY. | |
436 | */ | |
437 | ||
438 | ||
3c726f8d BH |
439 | do { |
440 | old_pte = pte_val(*ptep); | |
441 | if (old_pte & _PAGE_BUSY) | |
442 | goto out; | |
443 | new_pte = old_pte | _PAGE_BUSY | | |
444 | _PAGE_ACCESSED | _PAGE_HASHPTE; | |
445 | } while(old_pte != __cmpxchg_u64((unsigned long *)ptep, | |
446 | old_pte, new_pte)); | |
447 | ||
448 | rflags = 0x2 | (!(new_pte & _PAGE_RW)); | |
1da177e4 | 449 | /* _PAGE_EXEC -> HW_NO_EXEC since it's inverted */ |
3c726f8d | 450 | rflags |= ((new_pte & _PAGE_EXEC) ? 0 : HPTE_R_N); |
cbf52afd DG |
451 | if (!cpu_has_feature(CPU_FTR_COHERENT_ICACHE)) |
452 | /* No CPU has hugepages but lacks no execute, so we | |
453 | * don't need to worry about that case */ | |
454 | rflags = hash_huge_page_do_lazy_icache(rflags, __pte(old_pte), | |
455 | trap); | |
1da177e4 LT |
456 | |
457 | /* Check if pte already has an hpte (case 2) */ | |
3c726f8d | 458 | if (unlikely(old_pte & _PAGE_HASHPTE)) { |
1da177e4 LT |
459 | /* There MIGHT be an HPTE for this pte */ |
460 | unsigned long hash, slot; | |
461 | ||
1189be65 | 462 | hash = hpt_hash(va, HPAGE_SHIFT, ssize); |
3c726f8d | 463 | if (old_pte & _PAGE_F_SECOND) |
1da177e4 LT |
464 | hash = ~hash; |
465 | slot = (hash & htab_hash_mask) * HPTES_PER_GROUP; | |
3c726f8d | 466 | slot += (old_pte & _PAGE_F_GIX) >> 12; |
1da177e4 | 467 | |
325c82a0 | 468 | if (ppc_md.hpte_updatepp(slot, rflags, va, mmu_huge_psize, |
1189be65 | 469 | ssize, local) == -1) |
3c726f8d | 470 | old_pte &= ~_PAGE_HPTEFLAGS; |
1da177e4 LT |
471 | } |
472 | ||
3c726f8d | 473 | if (likely(!(old_pte & _PAGE_HASHPTE))) { |
1189be65 | 474 | unsigned long hash = hpt_hash(va, HPAGE_SHIFT, ssize); |
1da177e4 LT |
475 | unsigned long hpte_group; |
476 | ||
3c726f8d | 477 | pa = pte_pfn(__pte(old_pte)) << PAGE_SHIFT; |
1da177e4 LT |
478 | |
479 | repeat: | |
480 | hpte_group = ((hash & htab_hash_mask) * | |
481 | HPTES_PER_GROUP) & ~0x7UL; | |
482 | ||
3c726f8d BH |
483 | /* clear HPTE slot informations in new PTE */ |
484 | new_pte = (new_pte & ~_PAGE_HPTEFLAGS) | _PAGE_HASHPTE; | |
1da177e4 LT |
485 | |
486 | /* Add in WIMG bits */ | |
487 | /* XXX We should store these in the pte */ | |
3c726f8d | 488 | /* --BenH: I think they are ... */ |
96e28449 | 489 | rflags |= _PAGE_COHERENT; |
1da177e4 | 490 | |
3c726f8d BH |
491 | /* Insert into the hash table, primary slot */ |
492 | slot = ppc_md.hpte_insert(hpte_group, va, pa, rflags, 0, | |
1189be65 | 493 | mmu_huge_psize, ssize); |
1da177e4 LT |
494 | |
495 | /* Primary is full, try the secondary */ | |
496 | if (unlikely(slot == -1)) { | |
1da177e4 LT |
497 | hpte_group = ((~hash & htab_hash_mask) * |
498 | HPTES_PER_GROUP) & ~0x7UL; | |
3c726f8d | 499 | slot = ppc_md.hpte_insert(hpte_group, va, pa, rflags, |
67b10813 | 500 | HPTE_V_SECONDARY, |
1189be65 | 501 | mmu_huge_psize, ssize); |
1da177e4 LT |
502 | if (slot == -1) { |
503 | if (mftb() & 0x1) | |
67b10813 BH |
504 | hpte_group = ((hash & htab_hash_mask) * |
505 | HPTES_PER_GROUP)&~0x7UL; | |
1da177e4 LT |
506 | |
507 | ppc_md.hpte_remove(hpte_group); | |
508 | goto repeat; | |
509 | } | |
510 | } | |
511 | ||
512 | if (unlikely(slot == -2)) | |
513 | panic("hash_huge_page: pte_insert failed\n"); | |
514 | ||
d649bd7b | 515 | new_pte |= (slot << 12) & (_PAGE_F_SECOND | _PAGE_F_GIX); |
1da177e4 LT |
516 | } |
517 | ||
3c726f8d | 518 | /* |
01edcd89 | 519 | * No need to use ldarx/stdcx here |
3c726f8d BH |
520 | */ |
521 | *ptep = __pte(new_pte & ~_PAGE_BUSY); | |
522 | ||
1da177e4 LT |
523 | err = 0; |
524 | ||
525 | out: | |
1da177e4 LT |
526 | return err; |
527 | } | |
f10a04c0 | 528 | |
4ba9b9d0 | 529 | static void zero_ctor(struct kmem_cache *cache, void *addr) |
f10a04c0 DG |
530 | { |
531 | memset(addr, 0, kmem_cache_size(cache)); | |
532 | } | |
533 | ||
534 | static int __init hugetlbpage_init(void) | |
535 | { | |
536 | if (!cpu_has_feature(CPU_FTR_16M_PAGE)) | |
537 | return -ENODEV; | |
538 | ||
539 | huge_pgtable_cache = kmem_cache_create("hugepte_cache", | |
540 | HUGEPTE_TABLE_SIZE, | |
541 | HUGEPTE_TABLE_SIZE, | |
f0f3980b | 542 | 0, |
20c2df83 | 543 | zero_ctor); |
f10a04c0 DG |
544 | if (! huge_pgtable_cache) |
545 | panic("hugetlbpage_init(): could not create hugepte cache\n"); | |
546 | ||
547 | return 0; | |
548 | } | |
549 | ||
550 | module_init(hugetlbpage_init); |