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[PATCH] powerpc/iseries: Fix double phys_to_abs bug in htab_bolt_mapping
[linux-2.6.git] / arch / powerpc / mm / hash_utils_64.c
1 /*
2  * PowerPC64 port by Mike Corrigan and Dave Engebretsen
3  *   {mikejc|engebret}@us.ibm.com
4  *
5  *    Copyright (c) 2000 Mike Corrigan <mikejc@us.ibm.com>
6  *
7  * SMP scalability work:
8  *    Copyright (C) 2001 Anton Blanchard <anton@au.ibm.com>, IBM
9  * 
10  *    Module name: htab.c
11  *
12  *    Description:
13  *      PowerPC Hashed Page Table functions
14  *
15  * This program is free software; you can redistribute it and/or
16  * modify it under the terms of the GNU General Public License
17  * as published by the Free Software Foundation; either version
18  * 2 of the License, or (at your option) any later version.
19  */
20
21 #undef DEBUG
22 #undef DEBUG_LOW
23
24 #include <linux/config.h>
25 #include <linux/spinlock.h>
26 #include <linux/errno.h>
27 #include <linux/sched.h>
28 #include <linux/proc_fs.h>
29 #include <linux/stat.h>
30 #include <linux/sysctl.h>
31 #include <linux/ctype.h>
32 #include <linux/cache.h>
33 #include <linux/init.h>
34 #include <linux/signal.h>
35
36 #include <asm/processor.h>
37 #include <asm/pgtable.h>
38 #include <asm/mmu.h>
39 #include <asm/mmu_context.h>
40 #include <asm/page.h>
41 #include <asm/types.h>
42 #include <asm/system.h>
43 #include <asm/uaccess.h>
44 #include <asm/machdep.h>
45 #include <asm/lmb.h>
46 #include <asm/abs_addr.h>
47 #include <asm/tlbflush.h>
48 #include <asm/io.h>
49 #include <asm/eeh.h>
50 #include <asm/tlb.h>
51 #include <asm/cacheflush.h>
52 #include <asm/cputable.h>
53 #include <asm/abs_addr.h>
54 #include <asm/sections.h>
55
56 #ifdef DEBUG
57 #define DBG(fmt...) udbg_printf(fmt)
58 #else
59 #define DBG(fmt...)
60 #endif
61
62 #ifdef DEBUG_LOW
63 #define DBG_LOW(fmt...) udbg_printf(fmt)
64 #else
65 #define DBG_LOW(fmt...)
66 #endif
67
68 #define KB (1024)
69 #define MB (1024*KB)
70
71 /*
72  * Note:  pte   --> Linux PTE
73  *        HPTE  --> PowerPC Hashed Page Table Entry
74  *
75  * Execution context:
76  *   htab_initialize is called with the MMU off (of course), but
77  *   the kernel has been copied down to zero so it can directly
78  *   reference global data.  At this point it is very difficult
79  *   to print debug info.
80  *
81  */
82
83 #ifdef CONFIG_U3_DART
84 extern unsigned long dart_tablebase;
85 #endif /* CONFIG_U3_DART */
86
87 static unsigned long _SDR1;
88 struct mmu_psize_def mmu_psize_defs[MMU_PAGE_COUNT];
89
90 hpte_t *htab_address;
91 unsigned long htab_size_bytes;
92 unsigned long htab_hash_mask;
93 int mmu_linear_psize = MMU_PAGE_4K;
94 int mmu_virtual_psize = MMU_PAGE_4K;
95 #ifdef CONFIG_HUGETLB_PAGE
96 int mmu_huge_psize = MMU_PAGE_16M;
97 unsigned int HPAGE_SHIFT;
98 #endif
99
100 /* There are definitions of page sizes arrays to be used when none
101  * is provided by the firmware.
102  */
103
104 /* Pre-POWER4 CPUs (4k pages only)
105  */
106 struct mmu_psize_def mmu_psize_defaults_old[] = {
107         [MMU_PAGE_4K] = {
108                 .shift  = 12,
109                 .sllp   = 0,
110                 .penc   = 0,
111                 .avpnm  = 0,
112                 .tlbiel = 0,
113         },
114 };
115
116 /* POWER4, GPUL, POWER5
117  *
118  * Support for 16Mb large pages
119  */
120 struct mmu_psize_def mmu_psize_defaults_gp[] = {
121         [MMU_PAGE_4K] = {
122                 .shift  = 12,
123                 .sllp   = 0,
124                 .penc   = 0,
125                 .avpnm  = 0,
126                 .tlbiel = 1,
127         },
128         [MMU_PAGE_16M] = {
129                 .shift  = 24,
130                 .sllp   = SLB_VSID_L,
131                 .penc   = 0,
132                 .avpnm  = 0x1UL,
133                 .tlbiel = 0,
134         },
135 };
136
137
138 int htab_bolt_mapping(unsigned long vstart, unsigned long vend,
139                       unsigned long pstart, unsigned long mode, int psize)
140 {
141         unsigned long vaddr, paddr;
142         unsigned int step, shift;
143         unsigned long tmp_mode;
144         int ret = 0;
145
146         shift = mmu_psize_defs[psize].shift;
147         step = 1 << shift;
148
149         for (vaddr = vstart, paddr = pstart; vaddr < vend;
150              vaddr += step, paddr += step) {
151                 unsigned long vpn, hash, hpteg;
152                 unsigned long vsid = get_kernel_vsid(vaddr);
153                 unsigned long va = (vsid << 28) | (vaddr & 0x0fffffff);
154
155                 vpn = va >> shift;
156                 tmp_mode = mode;
157                 
158                 /* Make non-kernel text non-executable */
159                 if (!in_kernel_text(vaddr))
160                         tmp_mode = mode | HPTE_R_N;
161
162                 hash = hpt_hash(va, shift);
163                 hpteg = ((hash & htab_hash_mask) * HPTES_PER_GROUP);
164
165                 /* The crap below can be cleaned once ppd_md.probe() can
166                  * set up the hash callbacks, thus we can just used the
167                  * normal insert callback here.
168                  */
169 #ifdef CONFIG_PPC_ISERIES
170                 if (_machine == PLATFORM_ISERIES_LPAR)
171                         ret = iSeries_hpte_insert(hpteg, va,
172                                                   __pa(vaddr),
173                                                   tmp_mode,
174                                                   HPTE_V_BOLTED,
175                                                   psize);
176                 else
177 #endif
178 #ifdef CONFIG_PPC_PSERIES
179                 if (_machine & PLATFORM_LPAR)
180                         ret = pSeries_lpar_hpte_insert(hpteg, va,
181                                                        virt_to_abs(paddr),
182                                                        tmp_mode,
183                                                        HPTE_V_BOLTED,
184                                                        psize);
185                 else
186 #endif
187 #ifdef CONFIG_PPC_MULTIPLATFORM
188                         ret = native_hpte_insert(hpteg, va,
189                                                  virt_to_abs(paddr),
190                                                  tmp_mode, HPTE_V_BOLTED,
191                                                  psize);
192 #endif
193                 if (ret < 0)
194                         break;
195         }
196         return ret < 0 ? ret : 0;
197 }
198
199 static int __init htab_dt_scan_page_sizes(unsigned long node,
200                                           const char *uname, int depth,
201                                           void *data)
202 {
203         char *type = of_get_flat_dt_prop(node, "device_type", NULL);
204         u32 *prop;
205         unsigned long size = 0;
206
207         /* We are scanning "cpu" nodes only */
208         if (type == NULL || strcmp(type, "cpu") != 0)
209                 return 0;
210
211         prop = (u32 *)of_get_flat_dt_prop(node,
212                                           "ibm,segment-page-sizes", &size);
213         if (prop != NULL) {
214                 DBG("Page sizes from device-tree:\n");
215                 size /= 4;
216                 cur_cpu_spec->cpu_features &= ~(CPU_FTR_16M_PAGE);
217                 while(size > 0) {
218                         unsigned int shift = prop[0];
219                         unsigned int slbenc = prop[1];
220                         unsigned int lpnum = prop[2];
221                         unsigned int lpenc = 0;
222                         struct mmu_psize_def *def;
223                         int idx = -1;
224
225                         size -= 3; prop += 3;
226                         while(size > 0 && lpnum) {
227                                 if (prop[0] == shift)
228                                         lpenc = prop[1];
229                                 prop += 2; size -= 2;
230                                 lpnum--;
231                         }
232                         switch(shift) {
233                         case 0xc:
234                                 idx = MMU_PAGE_4K;
235                                 break;
236                         case 0x10:
237                                 idx = MMU_PAGE_64K;
238                                 break;
239                         case 0x14:
240                                 idx = MMU_PAGE_1M;
241                                 break;
242                         case 0x18:
243                                 idx = MMU_PAGE_16M;
244                                 cur_cpu_spec->cpu_features |= CPU_FTR_16M_PAGE;
245                                 break;
246                         case 0x22:
247                                 idx = MMU_PAGE_16G;
248                                 break;
249                         }
250                         if (idx < 0)
251                                 continue;
252                         def = &mmu_psize_defs[idx];
253                         def->shift = shift;
254                         if (shift <= 23)
255                                 def->avpnm = 0;
256                         else
257                                 def->avpnm = (1 << (shift - 23)) - 1;
258                         def->sllp = slbenc;
259                         def->penc = lpenc;
260                         /* We don't know for sure what's up with tlbiel, so
261                          * for now we only set it for 4K and 64K pages
262                          */
263                         if (idx == MMU_PAGE_4K || idx == MMU_PAGE_64K)
264                                 def->tlbiel = 1;
265                         else
266                                 def->tlbiel = 0;
267
268                         DBG(" %d: shift=%02x, sllp=%04x, avpnm=%08x, "
269                             "tlbiel=%d, penc=%d\n",
270                             idx, shift, def->sllp, def->avpnm, def->tlbiel,
271                             def->penc);
272                 }
273                 return 1;
274         }
275         return 0;
276 }
277
278
279 static void __init htab_init_page_sizes(void)
280 {
281         int rc;
282
283         /* Default to 4K pages only */
284         memcpy(mmu_psize_defs, mmu_psize_defaults_old,
285                sizeof(mmu_psize_defaults_old));
286
287         /*
288          * Try to find the available page sizes in the device-tree
289          */
290         rc = of_scan_flat_dt(htab_dt_scan_page_sizes, NULL);
291         if (rc != 0)  /* Found */
292                 goto found;
293
294         /*
295          * Not in the device-tree, let's fallback on known size
296          * list for 16M capable GP & GR
297          */
298         if ((_machine != PLATFORM_ISERIES_LPAR) &&
299             cpu_has_feature(CPU_FTR_16M_PAGE))
300                 memcpy(mmu_psize_defs, mmu_psize_defaults_gp,
301                        sizeof(mmu_psize_defaults_gp));
302  found:
303         /*
304          * Pick a size for the linear mapping. Currently, we only support
305          * 16M, 1M and 4K which is the default
306          */
307         if (mmu_psize_defs[MMU_PAGE_16M].shift)
308                 mmu_linear_psize = MMU_PAGE_16M;
309         else if (mmu_psize_defs[MMU_PAGE_1M].shift)
310                 mmu_linear_psize = MMU_PAGE_1M;
311
312         /*
313          * Pick a size for the ordinary pages. Default is 4K, we support
314          * 64K if cache inhibited large pages are supported by the
315          * processor
316          */
317 #ifdef CONFIG_PPC_64K_PAGES
318         if (mmu_psize_defs[MMU_PAGE_64K].shift &&
319             cpu_has_feature(CPU_FTR_CI_LARGE_PAGE))
320                 mmu_virtual_psize = MMU_PAGE_64K;
321 #endif
322
323         printk(KERN_INFO "Page orders: linear mapping = %d, others = %d\n",
324                mmu_psize_defs[mmu_linear_psize].shift,
325                mmu_psize_defs[mmu_virtual_psize].shift);
326
327 #ifdef CONFIG_HUGETLB_PAGE
328         /* Init large page size. Currently, we pick 16M or 1M depending
329          * on what is available
330          */
331         if (mmu_psize_defs[MMU_PAGE_16M].shift)
332                 mmu_huge_psize = MMU_PAGE_16M;
333         /* With 4k/4level pagetables, we can't (for now) cope with a
334          * huge page size < PMD_SIZE */
335         else if (mmu_psize_defs[MMU_PAGE_1M].shift)
336                 mmu_huge_psize = MMU_PAGE_1M;
337
338         /* Calculate HPAGE_SHIFT and sanity check it */
339         if (mmu_psize_defs[mmu_huge_psize].shift > MIN_HUGEPTE_SHIFT &&
340             mmu_psize_defs[mmu_huge_psize].shift < SID_SHIFT)
341                 HPAGE_SHIFT = mmu_psize_defs[mmu_huge_psize].shift;
342         else
343                 HPAGE_SHIFT = 0; /* No huge pages dude ! */
344 #endif /* CONFIG_HUGETLB_PAGE */
345 }
346
347 static int __init htab_dt_scan_pftsize(unsigned long node,
348                                        const char *uname, int depth,
349                                        void *data)
350 {
351         char *type = of_get_flat_dt_prop(node, "device_type", NULL);
352         u32 *prop;
353
354         /* We are scanning "cpu" nodes only */
355         if (type == NULL || strcmp(type, "cpu") != 0)
356                 return 0;
357
358         prop = (u32 *)of_get_flat_dt_prop(node, "ibm,pft-size", NULL);
359         if (prop != NULL) {
360                 /* pft_size[0] is the NUMA CEC cookie */
361                 ppc64_pft_size = prop[1];
362                 return 1;
363         }
364         return 0;
365 }
366
367 static unsigned long __init htab_get_table_size(void)
368 {
369         unsigned long mem_size, rnd_mem_size, pteg_count;
370
371         /* If hash size isn't already provided by the platform, we try to
372          * retrieve it from the device-tree. If it's not there neither, we
373          * calculate it now based on the total RAM size
374          */
375         if (ppc64_pft_size == 0)
376                 of_scan_flat_dt(htab_dt_scan_pftsize, NULL);
377         if (ppc64_pft_size)
378                 return 1UL << ppc64_pft_size;
379
380         /* round mem_size up to next power of 2 */
381         mem_size = lmb_phys_mem_size();
382         rnd_mem_size = 1UL << __ilog2(mem_size);
383         if (rnd_mem_size < mem_size)
384                 rnd_mem_size <<= 1;
385
386         /* # pages / 2 */
387         pteg_count = max(rnd_mem_size >> (12 + 1), 1UL << 11);
388
389         return pteg_count << 7;
390 }
391
392 #ifdef CONFIG_MEMORY_HOTPLUG
393 void create_section_mapping(unsigned long start, unsigned long end)
394 {
395                 BUG_ON(htab_bolt_mapping(start, end, start,
396                         _PAGE_ACCESSED | _PAGE_DIRTY | _PAGE_COHERENT | PP_RWXX,
397                         mmu_linear_psize));
398 }
399 #endif /* CONFIG_MEMORY_HOTPLUG */
400
401 void __init htab_initialize(void)
402 {
403         unsigned long table;
404         unsigned long pteg_count;
405         unsigned long mode_rw;
406         unsigned long base = 0, size = 0;
407         int i;
408
409         extern unsigned long tce_alloc_start, tce_alloc_end;
410
411         DBG(" -> htab_initialize()\n");
412
413         /* Initialize page sizes */
414         htab_init_page_sizes();
415
416         /*
417          * Calculate the required size of the htab.  We want the number of
418          * PTEGs to equal one half the number of real pages.
419          */ 
420         htab_size_bytes = htab_get_table_size();
421         pteg_count = htab_size_bytes >> 7;
422
423         htab_hash_mask = pteg_count - 1;
424
425         if (platform_is_lpar()) {
426                 /* Using a hypervisor which owns the htab */
427                 htab_address = NULL;
428                 _SDR1 = 0; 
429         } else {
430                 /* Find storage for the HPT.  Must be contiguous in
431                  * the absolute address space.
432                  */
433                 table = lmb_alloc(htab_size_bytes, htab_size_bytes);
434                 BUG_ON(table == 0);
435
436                 DBG("Hash table allocated at %lx, size: %lx\n", table,
437                     htab_size_bytes);
438
439                 htab_address = abs_to_virt(table);
440
441                 /* htab absolute addr + encoded htabsize */
442                 _SDR1 = table + __ilog2(pteg_count) - 11;
443
444                 /* Initialize the HPT with no entries */
445                 memset((void *)table, 0, htab_size_bytes);
446
447                 /* Set SDR1 */
448                 mtspr(SPRN_SDR1, _SDR1);
449         }
450
451         mode_rw = _PAGE_ACCESSED | _PAGE_DIRTY | _PAGE_COHERENT | PP_RWXX;
452
453         /* On U3 based machines, we need to reserve the DART area and
454          * _NOT_ map it to avoid cache paradoxes as it's remapped non
455          * cacheable later on
456          */
457
458         /* create bolted the linear mapping in the hash table */
459         for (i=0; i < lmb.memory.cnt; i++) {
460                 base = (unsigned long)__va(lmb.memory.region[i].base);
461                 size = lmb.memory.region[i].size;
462
463                 DBG("creating mapping for region: %lx : %lx\n", base, size);
464
465 #ifdef CONFIG_U3_DART
466                 /* Do not map the DART space. Fortunately, it will be aligned
467                  * in such a way that it will not cross two lmb regions and
468                  * will fit within a single 16Mb page.
469                  * The DART space is assumed to be a full 16Mb region even if
470                  * we only use 2Mb of that space. We will use more of it later
471                  * for AGP GART. We have to use a full 16Mb large page.
472                  */
473                 DBG("DART base: %lx\n", dart_tablebase);
474
475                 if (dart_tablebase != 0 && dart_tablebase >= base
476                     && dart_tablebase < (base + size)) {
477                         if (base != dart_tablebase)
478                                 BUG_ON(htab_bolt_mapping(base, dart_tablebase,
479                                                          base, mode_rw,
480                                                          mmu_linear_psize));
481                         if ((base + size) > (dart_tablebase + 16*MB))
482                                 BUG_ON(htab_bolt_mapping(dart_tablebase+16*MB,
483                                                          base + size,
484                                                          dart_tablebase+16*MB,
485                                                          mode_rw,
486                                                          mmu_linear_psize));
487                         continue;
488                 }
489 #endif /* CONFIG_U3_DART */
490                 BUG_ON(htab_bolt_mapping(base, base + size, base,
491                                          mode_rw, mmu_linear_psize));
492        }
493
494         /*
495          * If we have a memory_limit and we've allocated TCEs then we need to
496          * explicitly map the TCE area at the top of RAM. We also cope with the
497          * case that the TCEs start below memory_limit.
498          * tce_alloc_start/end are 16MB aligned so the mapping should work
499          * for either 4K or 16MB pages.
500          */
501         if (tce_alloc_start) {
502                 tce_alloc_start = (unsigned long)__va(tce_alloc_start);
503                 tce_alloc_end = (unsigned long)__va(tce_alloc_end);
504
505                 if (base + size >= tce_alloc_start)
506                         tce_alloc_start = base + size + 1;
507
508                 BUG_ON(htab_bolt_mapping(tce_alloc_start, tce_alloc_end,
509                                          tce_alloc_start, mode_rw,
510                                          mmu_linear_psize));
511         }
512
513         DBG(" <- htab_initialize()\n");
514 }
515 #undef KB
516 #undef MB
517
518 void htab_initialize_secondary(void)
519 {
520         if (!platform_is_lpar())
521                 mtspr(SPRN_SDR1, _SDR1);
522 }
523
524 /*
525  * Called by asm hashtable.S for doing lazy icache flush
526  */
527 unsigned int hash_page_do_lazy_icache(unsigned int pp, pte_t pte, int trap)
528 {
529         struct page *page;
530
531         if (!pfn_valid(pte_pfn(pte)))
532                 return pp;
533
534         page = pte_page(pte);
535
536         /* page is dirty */
537         if (!test_bit(PG_arch_1, &page->flags) && !PageReserved(page)) {
538                 if (trap == 0x400) {
539                         __flush_dcache_icache(page_address(page));
540                         set_bit(PG_arch_1, &page->flags);
541                 } else
542                         pp |= HPTE_R_N;
543         }
544         return pp;
545 }
546
547 /* Result code is:
548  *  0 - handled
549  *  1 - normal page fault
550  * -1 - critical hash insertion error
551  */
552 int hash_page(unsigned long ea, unsigned long access, unsigned long trap)
553 {
554         void *pgdir;
555         unsigned long vsid;
556         struct mm_struct *mm;
557         pte_t *ptep;
558         cpumask_t tmp;
559         int rc, user_region = 0, local = 0;
560
561         DBG_LOW("hash_page(ea=%016lx, access=%lx, trap=%lx\n",
562                 ea, access, trap);
563
564         if ((ea & ~REGION_MASK) >= PGTABLE_RANGE) {
565                 DBG_LOW(" out of pgtable range !\n");
566                 return 1;
567         }
568
569         /* Get region & vsid */
570         switch (REGION_ID(ea)) {
571         case USER_REGION_ID:
572                 user_region = 1;
573                 mm = current->mm;
574                 if (! mm) {
575                         DBG_LOW(" user region with no mm !\n");
576                         return 1;
577                 }
578                 vsid = get_vsid(mm->context.id, ea);
579                 break;
580         case VMALLOC_REGION_ID:
581                 mm = &init_mm;
582                 vsid = get_kernel_vsid(ea);
583                 break;
584         default:
585                 /* Not a valid range
586                  * Send the problem up to do_page_fault 
587                  */
588                 return 1;
589         }
590         DBG_LOW(" mm=%p, mm->pgdir=%p, vsid=%016lx\n", mm, mm->pgd, vsid);
591
592         /* Get pgdir */
593         pgdir = mm->pgd;
594         if (pgdir == NULL)
595                 return 1;
596
597         /* Check CPU locality */
598         tmp = cpumask_of_cpu(smp_processor_id());
599         if (user_region && cpus_equal(mm->cpu_vm_mask, tmp))
600                 local = 1;
601
602         /* Handle hugepage regions */
603         if (unlikely(in_hugepage_area(mm->context, ea))) {
604                 DBG_LOW(" -> huge page !\n");
605                 return hash_huge_page(mm, access, ea, vsid, local, trap);
606         }
607
608         /* Get PTE and page size from page tables */
609         ptep = find_linux_pte(pgdir, ea);
610         if (ptep == NULL || !pte_present(*ptep)) {
611                 DBG_LOW(" no PTE !\n");
612                 return 1;
613         }
614
615 #ifndef CONFIG_PPC_64K_PAGES
616         DBG_LOW(" i-pte: %016lx\n", pte_val(*ptep));
617 #else
618         DBG_LOW(" i-pte: %016lx %016lx\n", pte_val(*ptep),
619                 pte_val(*(ptep + PTRS_PER_PTE)));
620 #endif
621         /* Pre-check access permissions (will be re-checked atomically
622          * in __hash_page_XX but this pre-check is a fast path
623          */
624         if (access & ~pte_val(*ptep)) {
625                 DBG_LOW(" no access !\n");
626                 return 1;
627         }
628
629         /* Do actual hashing */
630 #ifndef CONFIG_PPC_64K_PAGES
631         rc = __hash_page_4K(ea, access, vsid, ptep, trap, local);
632 #else
633         if (mmu_virtual_psize == MMU_PAGE_64K)
634                 rc = __hash_page_64K(ea, access, vsid, ptep, trap, local);
635         else
636                 rc = __hash_page_4K(ea, access, vsid, ptep, trap, local);
637 #endif /* CONFIG_PPC_64K_PAGES */
638
639 #ifndef CONFIG_PPC_64K_PAGES
640         DBG_LOW(" o-pte: %016lx\n", pte_val(*ptep));
641 #else
642         DBG_LOW(" o-pte: %016lx %016lx\n", pte_val(*ptep),
643                 pte_val(*(ptep + PTRS_PER_PTE)));
644 #endif
645         DBG_LOW(" -> rc=%d\n", rc);
646         return rc;
647 }
648 EXPORT_SYMBOL_GPL(hash_page);
649
650 void hash_preload(struct mm_struct *mm, unsigned long ea,
651                   unsigned long access, unsigned long trap)
652 {
653         unsigned long vsid;
654         void *pgdir;
655         pte_t *ptep;
656         cpumask_t mask;
657         unsigned long flags;
658         int local = 0;
659
660         /* We don't want huge pages prefaulted for now
661          */
662         if (unlikely(in_hugepage_area(mm->context, ea)))
663                 return;
664
665         DBG_LOW("hash_preload(mm=%p, mm->pgdir=%p, ea=%016lx, access=%lx,"
666                 " trap=%lx\n", mm, mm->pgd, ea, access, trap);
667
668         /* Get PTE, VSID, access mask */
669         pgdir = mm->pgd;
670         if (pgdir == NULL)
671                 return;
672         ptep = find_linux_pte(pgdir, ea);
673         if (!ptep)
674                 return;
675         vsid = get_vsid(mm->context.id, ea);
676
677         /* Hash it in */
678         local_irq_save(flags);
679         mask = cpumask_of_cpu(smp_processor_id());
680         if (cpus_equal(mm->cpu_vm_mask, mask))
681                 local = 1;
682 #ifndef CONFIG_PPC_64K_PAGES
683         __hash_page_4K(ea, access, vsid, ptep, trap, local);
684 #else
685         if (mmu_virtual_psize == MMU_PAGE_64K)
686                 __hash_page_64K(ea, access, vsid, ptep, trap, local);
687         else
688                 __hash_page_4K(ea, access, vsid, ptep, trap, local);
689 #endif /* CONFIG_PPC_64K_PAGES */
690         local_irq_restore(flags);
691 }
692
693 void flush_hash_page(unsigned long va, real_pte_t pte, int psize, int local)
694 {
695         unsigned long hash, index, shift, hidx, slot;
696
697         DBG_LOW("flush_hash_page(va=%016x)\n", va);
698         pte_iterate_hashed_subpages(pte, psize, va, index, shift) {
699                 hash = hpt_hash(va, shift);
700                 hidx = __rpte_to_hidx(pte, index);
701                 if (hidx & _PTEIDX_SECONDARY)
702                         hash = ~hash;
703                 slot = (hash & htab_hash_mask) * HPTES_PER_GROUP;
704                 slot += hidx & _PTEIDX_GROUP_IX;
705                 DBG_LOW(" sub %d: hash=%x, hidx=%x\n", index, slot, hidx);
706                 ppc_md.hpte_invalidate(slot, va, psize, local);
707         } pte_iterate_hashed_end();
708 }
709
710 void flush_hash_range(unsigned long number, int local)
711 {
712         if (ppc_md.flush_hash_range)
713                 ppc_md.flush_hash_range(number, local);
714         else {
715                 int i;
716                 struct ppc64_tlb_batch *batch =
717                         &__get_cpu_var(ppc64_tlb_batch);
718
719                 for (i = 0; i < number; i++)
720                         flush_hash_page(batch->vaddr[i], batch->pte[i],
721                                         batch->psize, local);
722         }
723 }
724
725 static inline void make_bl(unsigned int *insn_addr, void *func)
726 {
727         unsigned long funcp = *((unsigned long *)func);
728         int offset = funcp - (unsigned long)insn_addr;
729
730         *insn_addr = (unsigned int)(0x48000001 | (offset & 0x03fffffc));
731         flush_icache_range((unsigned long)insn_addr, 4+
732                            (unsigned long)insn_addr);
733 }
734
735 /*
736  * low_hash_fault is called when we the low level hash code failed
737  * to instert a PTE due to an hypervisor error
738  */
739 void low_hash_fault(struct pt_regs *regs, unsigned long address)
740 {
741         if (user_mode(regs)) {
742                 siginfo_t info;
743
744                 info.si_signo = SIGBUS;
745                 info.si_errno = 0;
746                 info.si_code = BUS_ADRERR;
747                 info.si_addr = (void __user *)address;
748                 force_sig_info(SIGBUS, &info, current);
749                 return;
750         }
751         bad_page_fault(regs, address, SIGBUS);
752 }
753
754 void __init htab_finish_init(void)
755 {
756         extern unsigned int *htab_call_hpte_insert1;
757         extern unsigned int *htab_call_hpte_insert2;
758         extern unsigned int *htab_call_hpte_remove;
759         extern unsigned int *htab_call_hpte_updatepp;
760
761 #ifdef CONFIG_PPC_64K_PAGES
762         extern unsigned int *ht64_call_hpte_insert1;
763         extern unsigned int *ht64_call_hpte_insert2;
764         extern unsigned int *ht64_call_hpte_remove;
765         extern unsigned int *ht64_call_hpte_updatepp;
766
767         make_bl(ht64_call_hpte_insert1, ppc_md.hpte_insert);
768         make_bl(ht64_call_hpte_insert2, ppc_md.hpte_insert);
769         make_bl(ht64_call_hpte_remove, ppc_md.hpte_remove);
770         make_bl(ht64_call_hpte_updatepp, ppc_md.hpte_updatepp);
771 #endif /* CONFIG_PPC_64K_PAGES */
772
773         make_bl(htab_call_hpte_insert1, ppc_md.hpte_insert);
774         make_bl(htab_call_hpte_insert2, ppc_md.hpte_insert);
775         make_bl(htab_call_hpte_remove, ppc_md.hpte_remove);
776         make_bl(htab_call_hpte_updatepp, ppc_md.hpte_updatepp);
777 }