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14cf11af PM |
1 | /* |
2 | * PowerPC version | |
3 | * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org) | |
4 | * | |
5 | * Modifications by Paul Mackerras (PowerMac) (paulus@cs.anu.edu.au) | |
6 | * and Cort Dougan (PReP) (cort@cs.nmt.edu) | |
7 | * Copyright (C) 1996 Paul Mackerras | |
8 | * Amiga/APUS changes by Jesper Skov (jskov@cygnus.co.uk). | |
9 | * PPC44x/36-bit changes by Matt Porter (mporter@mvista.com) | |
10 | * | |
11 | * Derived from "arch/i386/mm/init.c" | |
12 | * Copyright (C) 1991, 1992, 1993, 1994 Linus Torvalds | |
13 | * | |
14 | * This program is free software; you can redistribute it and/or | |
15 | * modify it under the terms of the GNU General Public License | |
16 | * as published by the Free Software Foundation; either version | |
17 | * 2 of the License, or (at your option) any later version. | |
18 | * | |
19 | */ | |
20 | ||
21 | #include <linux/config.h> | |
22 | #include <linux/module.h> | |
23 | #include <linux/sched.h> | |
24 | #include <linux/kernel.h> | |
25 | #include <linux/errno.h> | |
26 | #include <linux/string.h> | |
27 | #include <linux/types.h> | |
28 | #include <linux/mm.h> | |
29 | #include <linux/stddef.h> | |
30 | #include <linux/init.h> | |
31 | #include <linux/bootmem.h> | |
32 | #include <linux/highmem.h> | |
33 | #include <linux/initrd.h> | |
34 | #include <linux/pagemap.h> | |
35 | ||
36 | #include <asm/pgalloc.h> | |
37 | #include <asm/prom.h> | |
38 | #include <asm/io.h> | |
39 | #include <asm/mmu_context.h> | |
40 | #include <asm/pgtable.h> | |
41 | #include <asm/mmu.h> | |
42 | #include <asm/smp.h> | |
43 | #include <asm/machdep.h> | |
44 | #include <asm/btext.h> | |
45 | #include <asm/tlb.h> | |
14cf11af | 46 | #include <asm/prom.h> |
7c8c6b97 PM |
47 | #include <asm/lmb.h> |
48 | #include <asm/sections.h> | |
ab1f9dac PM |
49 | #ifdef CONFIG_PPC64 |
50 | #include <asm/vdso.h> | |
51 | #endif | |
14cf11af | 52 | |
14cf11af PM |
53 | #include "mmu_decl.h" |
54 | ||
55 | #ifndef CPU_FTR_COHERENT_ICACHE | |
56 | #define CPU_FTR_COHERENT_ICACHE 0 /* XXX for now */ | |
57 | #define CPU_FTR_NOEXECUTE 0 | |
58 | #endif | |
59 | ||
7c8c6b97 PM |
60 | int init_bootmem_done; |
61 | int mem_init_done; | |
cf00a8d1 | 62 | unsigned long memory_limit; |
7c8c6b97 | 63 | |
3c726f8d BH |
64 | extern void hash_preload(struct mm_struct *mm, unsigned long ea, |
65 | unsigned long access, unsigned long trap); | |
66 | ||
14cf11af PM |
67 | /* |
68 | * This is called by /dev/mem to know if a given address has to | |
69 | * be mapped non-cacheable or not | |
70 | */ | |
71 | int page_is_ram(unsigned long pfn) | |
72 | { | |
73 | unsigned long paddr = (pfn << PAGE_SHIFT); | |
74 | ||
75 | #ifndef CONFIG_PPC64 /* XXX for now */ | |
76 | return paddr < __pa(high_memory); | |
77 | #else | |
78 | int i; | |
79 | for (i=0; i < lmb.memory.cnt; i++) { | |
80 | unsigned long base; | |
81 | ||
82 | base = lmb.memory.region[i].base; | |
83 | ||
84 | if ((paddr >= base) && | |
85 | (paddr < (base + lmb.memory.region[i].size))) { | |
86 | return 1; | |
87 | } | |
88 | } | |
89 | ||
90 | return 0; | |
91 | #endif | |
92 | } | |
93 | EXPORT_SYMBOL(page_is_ram); | |
94 | ||
8b150478 | 95 | pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn, |
14cf11af PM |
96 | unsigned long size, pgprot_t vma_prot) |
97 | { | |
98 | if (ppc_md.phys_mem_access_prot) | |
8b150478 | 99 | return ppc_md.phys_mem_access_prot(file, pfn, size, vma_prot); |
14cf11af | 100 | |
8b150478 | 101 | if (!page_is_ram(pfn)) |
14cf11af PM |
102 | vma_prot = __pgprot(pgprot_val(vma_prot) |
103 | | _PAGE_GUARDED | _PAGE_NO_CACHE); | |
104 | return vma_prot; | |
105 | } | |
106 | EXPORT_SYMBOL(phys_mem_access_prot); | |
107 | ||
23fd0775 PM |
108 | #ifdef CONFIG_MEMORY_HOTPLUG |
109 | ||
110 | void online_page(struct page *page) | |
111 | { | |
112 | ClearPageReserved(page); | |
113 | free_cold_page(page); | |
114 | totalram_pages++; | |
115 | num_physpages++; | |
116 | } | |
117 | ||
118 | /* | |
119 | * This works only for the non-NUMA case. Later, we'll need a lookup | |
120 | * to convert from real physical addresses to nid, that doesn't use | |
121 | * pfn_to_nid(). | |
122 | */ | |
123 | int __devinit add_memory(u64 start, u64 size) | |
124 | { | |
125 | struct pglist_data *pgdata = NODE_DATA(0); | |
126 | struct zone *zone; | |
127 | unsigned long start_pfn = start >> PAGE_SHIFT; | |
128 | unsigned long nr_pages = size >> PAGE_SHIFT; | |
129 | ||
130 | /* this should work for most non-highmem platforms */ | |
131 | zone = pgdata->node_zones; | |
132 | ||
133 | return __add_pages(zone, start_pfn, nr_pages); | |
134 | ||
135 | return 0; | |
136 | } | |
137 | ||
138 | /* | |
139 | * First pass at this code will check to determine if the remove | |
140 | * request is within the RMO. Do not allow removal within the RMO. | |
141 | */ | |
142 | int __devinit remove_memory(u64 start, u64 size) | |
143 | { | |
144 | struct zone *zone; | |
145 | unsigned long start_pfn, end_pfn, nr_pages; | |
146 | ||
147 | start_pfn = start >> PAGE_SHIFT; | |
148 | nr_pages = size >> PAGE_SHIFT; | |
149 | end_pfn = start_pfn + nr_pages; | |
150 | ||
151 | printk("%s(): Attempting to remove memoy in range " | |
152 | "%lx to %lx\n", __func__, start, start+size); | |
153 | /* | |
154 | * check for range within RMO | |
155 | */ | |
156 | zone = page_zone(pfn_to_page(start_pfn)); | |
157 | ||
158 | printk("%s(): memory will be removed from " | |
159 | "the %s zone\n", __func__, zone->name); | |
160 | ||
161 | /* | |
162 | * not handling removing memory ranges that | |
163 | * overlap multiple zones yet | |
164 | */ | |
165 | if (end_pfn > (zone->zone_start_pfn + zone->spanned_pages)) | |
166 | goto overlap; | |
167 | ||
168 | /* make sure it is NOT in RMO */ | |
169 | if ((start < lmb.rmo_size) || ((start+size) < lmb.rmo_size)) { | |
170 | printk("%s(): range to be removed must NOT be in RMO!\n", | |
171 | __func__); | |
172 | goto in_rmo; | |
173 | } | |
174 | ||
175 | return __remove_pages(zone, start_pfn, nr_pages); | |
176 | ||
177 | overlap: | |
178 | printk("%s(): memory range to be removed overlaps " | |
179 | "multiple zones!!!\n", __func__); | |
180 | in_rmo: | |
181 | return -1; | |
182 | } | |
183 | #endif /* CONFIG_MEMORY_HOTPLUG */ | |
184 | ||
14cf11af PM |
185 | void show_mem(void) |
186 | { | |
187 | unsigned long total = 0, reserved = 0; | |
188 | unsigned long shared = 0, cached = 0; | |
189 | unsigned long highmem = 0; | |
190 | struct page *page; | |
191 | pg_data_t *pgdat; | |
192 | unsigned long i; | |
193 | ||
194 | printk("Mem-info:\n"); | |
195 | show_free_areas(); | |
196 | printk("Free swap: %6ldkB\n", nr_swap_pages<<(PAGE_SHIFT-10)); | |
197 | for_each_pgdat(pgdat) { | |
23fd0775 PM |
198 | unsigned long flags; |
199 | pgdat_resize_lock(pgdat, &flags); | |
14cf11af PM |
200 | for (i = 0; i < pgdat->node_spanned_pages; i++) { |
201 | page = pgdat_page_nr(pgdat, i); | |
202 | total++; | |
203 | if (PageHighMem(page)) | |
204 | highmem++; | |
205 | if (PageReserved(page)) | |
206 | reserved++; | |
207 | else if (PageSwapCache(page)) | |
208 | cached++; | |
209 | else if (page_count(page)) | |
210 | shared += page_count(page) - 1; | |
211 | } | |
23fd0775 | 212 | pgdat_resize_unlock(pgdat, &flags); |
14cf11af PM |
213 | } |
214 | printk("%ld pages of RAM\n", total); | |
215 | #ifdef CONFIG_HIGHMEM | |
216 | printk("%ld pages of HIGHMEM\n", highmem); | |
217 | #endif | |
218 | printk("%ld reserved pages\n", reserved); | |
219 | printk("%ld pages shared\n", shared); | |
220 | printk("%ld pages swap cached\n", cached); | |
221 | } | |
222 | ||
7c8c6b97 PM |
223 | /* |
224 | * Initialize the bootmem system and give it all the memory we | |
225 | * have available. If we are using highmem, we only put the | |
226 | * lowmem into the bootmem system. | |
227 | */ | |
228 | #ifndef CONFIG_NEED_MULTIPLE_NODES | |
229 | void __init do_init_bootmem(void) | |
230 | { | |
231 | unsigned long i; | |
232 | unsigned long start, bootmap_pages; | |
233 | unsigned long total_pages; | |
234 | int boot_mapsize; | |
235 | ||
236 | max_pfn = total_pages = lmb_end_of_DRAM() >> PAGE_SHIFT; | |
237 | #ifdef CONFIG_HIGHMEM | |
238 | total_pages = total_lowmem >> PAGE_SHIFT; | |
239 | #endif | |
240 | ||
241 | /* | |
242 | * Find an area to use for the bootmem bitmap. Calculate the size of | |
243 | * bitmap required as (Total Memory) / PAGE_SIZE / BITS_PER_BYTE. | |
244 | * Add 1 additional page in case the address isn't page-aligned. | |
245 | */ | |
246 | bootmap_pages = bootmem_bootmap_pages(total_pages); | |
247 | ||
248 | start = lmb_alloc(bootmap_pages << PAGE_SHIFT, PAGE_SIZE); | |
249 | BUG_ON(!start); | |
250 | ||
251 | boot_mapsize = init_bootmem(start >> PAGE_SHIFT, total_pages); | |
252 | ||
253 | /* Add all physical memory to the bootmem map, mark each area | |
254 | * present. | |
255 | */ | |
256 | for (i = 0; i < lmb.memory.cnt; i++) { | |
257 | unsigned long base = lmb.memory.region[i].base; | |
258 | unsigned long size = lmb_size_bytes(&lmb.memory, i); | |
259 | #ifdef CONFIG_HIGHMEM | |
260 | if (base >= total_lowmem) | |
261 | continue; | |
262 | if (base + size > total_lowmem) | |
263 | size = total_lowmem - base; | |
264 | #endif | |
265 | free_bootmem(base, size); | |
266 | } | |
267 | ||
268 | /* reserve the sections we're already using */ | |
269 | for (i = 0; i < lmb.reserved.cnt; i++) | |
270 | reserve_bootmem(lmb.reserved.region[i].base, | |
271 | lmb_size_bytes(&lmb.reserved, i)); | |
272 | ||
273 | /* XXX need to clip this if using highmem? */ | |
274 | for (i = 0; i < lmb.memory.cnt; i++) | |
275 | memory_present(0, lmb_start_pfn(&lmb.memory, i), | |
276 | lmb_end_pfn(&lmb.memory, i)); | |
277 | init_bootmem_done = 1; | |
278 | } | |
279 | ||
280 | /* | |
281 | * paging_init() sets up the page tables - in fact we've already done this. | |
282 | */ | |
283 | void __init paging_init(void) | |
284 | { | |
285 | unsigned long zones_size[MAX_NR_ZONES]; | |
286 | unsigned long zholes_size[MAX_NR_ZONES]; | |
287 | unsigned long total_ram = lmb_phys_mem_size(); | |
288 | unsigned long top_of_ram = lmb_end_of_DRAM(); | |
289 | ||
290 | #ifdef CONFIG_HIGHMEM | |
291 | map_page(PKMAP_BASE, 0, 0); /* XXX gross */ | |
292 | pkmap_page_table = pte_offset_kernel(pmd_offset(pgd_offset_k | |
293 | (PKMAP_BASE), PKMAP_BASE), PKMAP_BASE); | |
294 | map_page(KMAP_FIX_BEGIN, 0, 0); /* XXX gross */ | |
295 | kmap_pte = pte_offset_kernel(pmd_offset(pgd_offset_k | |
296 | (KMAP_FIX_BEGIN), KMAP_FIX_BEGIN), KMAP_FIX_BEGIN); | |
297 | kmap_prot = PAGE_KERNEL; | |
298 | #endif /* CONFIG_HIGHMEM */ | |
299 | ||
300 | printk(KERN_INFO "Top of RAM: 0x%lx, Total RAM: 0x%lx\n", | |
301 | top_of_ram, total_ram); | |
302 | printk(KERN_INFO "Memory hole size: %ldMB\n", | |
303 | (top_of_ram - total_ram) >> 20); | |
304 | /* | |
305 | * All pages are DMA-able so we put them all in the DMA zone. | |
306 | */ | |
307 | memset(zones_size, 0, sizeof(zones_size)); | |
308 | memset(zholes_size, 0, sizeof(zholes_size)); | |
309 | ||
310 | zones_size[ZONE_DMA] = top_of_ram >> PAGE_SHIFT; | |
311 | zholes_size[ZONE_DMA] = (top_of_ram - total_ram) >> PAGE_SHIFT; | |
312 | ||
313 | #ifdef CONFIG_HIGHMEM | |
314 | zones_size[ZONE_DMA] = total_lowmem >> PAGE_SHIFT; | |
315 | zones_size[ZONE_HIGHMEM] = (total_memory - total_lowmem) >> PAGE_SHIFT; | |
316 | zholes_size[ZONE_HIGHMEM] = (top_of_ram - total_ram) >> PAGE_SHIFT; | |
317 | #else | |
318 | zones_size[ZONE_DMA] = top_of_ram >> PAGE_SHIFT; | |
319 | zholes_size[ZONE_DMA] = (top_of_ram - total_ram) >> PAGE_SHIFT; | |
320 | #endif /* CONFIG_HIGHMEM */ | |
321 | ||
322 | free_area_init_node(0, NODE_DATA(0), zones_size, | |
323 | __pa(PAGE_OFFSET) >> PAGE_SHIFT, zholes_size); | |
324 | } | |
325 | #endif /* ! CONFIG_NEED_MULTIPLE_NODES */ | |
326 | ||
327 | void __init mem_init(void) | |
328 | { | |
329 | #ifdef CONFIG_NEED_MULTIPLE_NODES | |
330 | int nid; | |
331 | #endif | |
332 | pg_data_t *pgdat; | |
333 | unsigned long i; | |
334 | struct page *page; | |
335 | unsigned long reservedpages = 0, codesize, initsize, datasize, bsssize; | |
336 | ||
337 | num_physpages = max_pfn; /* RAM is assumed contiguous */ | |
338 | high_memory = (void *) __va(max_low_pfn * PAGE_SIZE); | |
339 | ||
340 | #ifdef CONFIG_NEED_MULTIPLE_NODES | |
341 | for_each_online_node(nid) { | |
342 | if (NODE_DATA(nid)->node_spanned_pages != 0) { | |
343 | printk("freeing bootmem node %x\n", nid); | |
344 | totalram_pages += | |
345 | free_all_bootmem_node(NODE_DATA(nid)); | |
346 | } | |
347 | } | |
348 | #else | |
349 | max_mapnr = num_physpages; | |
350 | totalram_pages += free_all_bootmem(); | |
351 | #endif | |
352 | for_each_pgdat(pgdat) { | |
353 | for (i = 0; i < pgdat->node_spanned_pages; i++) { | |
354 | page = pgdat_page_nr(pgdat, i); | |
355 | if (PageReserved(page)) | |
356 | reservedpages++; | |
357 | } | |
358 | } | |
359 | ||
360 | codesize = (unsigned long)&_sdata - (unsigned long)&_stext; | |
bcb35576 | 361 | datasize = (unsigned long)&_edata - (unsigned long)&_sdata; |
7c8c6b97 PM |
362 | initsize = (unsigned long)&__init_end - (unsigned long)&__init_begin; |
363 | bsssize = (unsigned long)&__bss_stop - (unsigned long)&__bss_start; | |
364 | ||
365 | #ifdef CONFIG_HIGHMEM | |
366 | { | |
367 | unsigned long pfn, highmem_mapnr; | |
368 | ||
369 | highmem_mapnr = total_lowmem >> PAGE_SHIFT; | |
370 | for (pfn = highmem_mapnr; pfn < max_mapnr; ++pfn) { | |
371 | struct page *page = pfn_to_page(pfn); | |
372 | ||
373 | ClearPageReserved(page); | |
374 | set_page_count(page, 1); | |
375 | __free_page(page); | |
376 | totalhigh_pages++; | |
377 | } | |
378 | totalram_pages += totalhigh_pages; | |
379 | printk(KERN_INFO "High memory: %luk\n", | |
380 | totalhigh_pages << (PAGE_SHIFT-10)); | |
381 | } | |
382 | #endif /* CONFIG_HIGHMEM */ | |
383 | ||
384 | printk(KERN_INFO "Memory: %luk/%luk available (%luk kernel code, " | |
385 | "%luk reserved, %luk data, %luk bss, %luk init)\n", | |
386 | (unsigned long)nr_free_pages() << (PAGE_SHIFT-10), | |
387 | num_physpages << (PAGE_SHIFT-10), | |
388 | codesize >> 10, | |
389 | reservedpages << (PAGE_SHIFT-10), | |
390 | datasize >> 10, | |
391 | bsssize >> 10, | |
392 | initsize >> 10); | |
393 | ||
394 | mem_init_done = 1; | |
395 | ||
396 | #ifdef CONFIG_PPC64 | |
397 | /* Initialize the vDSO */ | |
398 | vdso_init(); | |
399 | #endif | |
400 | } | |
401 | ||
14cf11af PM |
402 | /* |
403 | * This is called when a page has been modified by the kernel. | |
404 | * It just marks the page as not i-cache clean. We do the i-cache | |
405 | * flush later when the page is given to a user process, if necessary. | |
406 | */ | |
407 | void flush_dcache_page(struct page *page) | |
408 | { | |
409 | if (cpu_has_feature(CPU_FTR_COHERENT_ICACHE)) | |
410 | return; | |
411 | /* avoid an atomic op if possible */ | |
412 | if (test_bit(PG_arch_1, &page->flags)) | |
413 | clear_bit(PG_arch_1, &page->flags); | |
414 | } | |
415 | EXPORT_SYMBOL(flush_dcache_page); | |
416 | ||
417 | void flush_dcache_icache_page(struct page *page) | |
418 | { | |
419 | #ifdef CONFIG_BOOKE | |
420 | void *start = kmap_atomic(page, KM_PPC_SYNC_ICACHE); | |
421 | __flush_dcache_icache(start); | |
422 | kunmap_atomic(start, KM_PPC_SYNC_ICACHE); | |
ab1f9dac | 423 | #elif defined(CONFIG_8xx) || defined(CONFIG_PPC64) |
14cf11af PM |
424 | /* On 8xx there is no need to kmap since highmem is not supported */ |
425 | __flush_dcache_icache(page_address(page)); | |
426 | #else | |
427 | __flush_dcache_icache_phys(page_to_pfn(page) << PAGE_SHIFT); | |
428 | #endif | |
429 | ||
430 | } | |
431 | void clear_user_page(void *page, unsigned long vaddr, struct page *pg) | |
432 | { | |
433 | clear_page(page); | |
434 | ||
435 | if (cpu_has_feature(CPU_FTR_COHERENT_ICACHE)) | |
436 | return; | |
437 | /* | |
438 | * We shouldnt have to do this, but some versions of glibc | |
439 | * require it (ld.so assumes zero filled pages are icache clean) | |
440 | * - Anton | |
441 | */ | |
442 | ||
443 | /* avoid an atomic op if possible */ | |
444 | if (test_bit(PG_arch_1, &pg->flags)) | |
445 | clear_bit(PG_arch_1, &pg->flags); | |
446 | } | |
447 | EXPORT_SYMBOL(clear_user_page); | |
448 | ||
449 | void copy_user_page(void *vto, void *vfrom, unsigned long vaddr, | |
450 | struct page *pg) | |
451 | { | |
452 | copy_page(vto, vfrom); | |
453 | ||
454 | /* | |
455 | * We should be able to use the following optimisation, however | |
456 | * there are two problems. | |
457 | * Firstly a bug in some versions of binutils meant PLT sections | |
458 | * were not marked executable. | |
459 | * Secondly the first word in the GOT section is blrl, used | |
460 | * to establish the GOT address. Until recently the GOT was | |
461 | * not marked executable. | |
462 | * - Anton | |
463 | */ | |
464 | #if 0 | |
465 | if (!vma->vm_file && ((vma->vm_flags & VM_EXEC) == 0)) | |
466 | return; | |
467 | #endif | |
468 | ||
469 | if (cpu_has_feature(CPU_FTR_COHERENT_ICACHE)) | |
470 | return; | |
471 | ||
472 | /* avoid an atomic op if possible */ | |
473 | if (test_bit(PG_arch_1, &pg->flags)) | |
474 | clear_bit(PG_arch_1, &pg->flags); | |
475 | } | |
476 | ||
477 | void flush_icache_user_range(struct vm_area_struct *vma, struct page *page, | |
478 | unsigned long addr, int len) | |
479 | { | |
480 | unsigned long maddr; | |
481 | ||
482 | maddr = (unsigned long) kmap(page) + (addr & ~PAGE_MASK); | |
483 | flush_icache_range(maddr, maddr + len); | |
484 | kunmap(page); | |
485 | } | |
486 | EXPORT_SYMBOL(flush_icache_user_range); | |
487 | ||
488 | /* | |
489 | * This is called at the end of handling a user page fault, when the | |
490 | * fault has been handled by updating a PTE in the linux page tables. | |
491 | * We use it to preload an HPTE into the hash table corresponding to | |
492 | * the updated linux PTE. | |
493 | * | |
494 | * This must always be called with the mm->page_table_lock held | |
495 | */ | |
496 | void update_mmu_cache(struct vm_area_struct *vma, unsigned long address, | |
497 | pte_t pte) | |
498 | { | |
3c726f8d BH |
499 | #ifdef CONFIG_PPC_STD_MMU |
500 | unsigned long access = 0, trap; | |
14cf11af | 501 | #endif |
3c726f8d | 502 | unsigned long pfn = pte_pfn(pte); |
14cf11af PM |
503 | |
504 | /* handle i-cache coherency */ | |
505 | if (!cpu_has_feature(CPU_FTR_COHERENT_ICACHE) && | |
506 | !cpu_has_feature(CPU_FTR_NOEXECUTE) && | |
507 | pfn_valid(pfn)) { | |
508 | struct page *page = pfn_to_page(pfn); | |
509 | if (!PageReserved(page) | |
510 | && !test_bit(PG_arch_1, &page->flags)) { | |
511 | if (vma->vm_mm == current->active_mm) { | |
512 | #ifdef CONFIG_8xx | |
513 | /* On 8xx, cache control instructions (particularly | |
514 | * "dcbst" from flush_dcache_icache) fault as write | |
515 | * operation if there is an unpopulated TLB entry | |
516 | * for the address in question. To workaround that, | |
517 | * we invalidate the TLB here, thus avoiding dcbst | |
518 | * misbehaviour. | |
519 | */ | |
520 | _tlbie(address); | |
521 | #endif | |
522 | __flush_dcache_icache((void *) address); | |
523 | } else | |
524 | flush_dcache_icache_page(page); | |
525 | set_bit(PG_arch_1, &page->flags); | |
526 | } | |
527 | } | |
528 | ||
529 | #ifdef CONFIG_PPC_STD_MMU | |
530 | /* We only want HPTEs for linux PTEs that have _PAGE_ACCESSED set */ | |
531 | if (!pte_young(pte) || address >= TASK_SIZE) | |
532 | return; | |
14cf11af | 533 | |
3c726f8d BH |
534 | /* We try to figure out if we are coming from an instruction |
535 | * access fault and pass that down to __hash_page so we avoid | |
536 | * double-faulting on execution of fresh text. We have to test | |
537 | * for regs NULL since init will get here first thing at boot | |
538 | * | |
539 | * We also avoid filling the hash if not coming from a fault | |
540 | */ | |
541 | if (current->thread.regs == NULL) | |
14cf11af | 542 | return; |
3c726f8d BH |
543 | trap = TRAP(current->thread.regs); |
544 | if (trap == 0x400) | |
545 | access |= _PAGE_EXEC; | |
546 | else if (trap != 0x300) | |
547 | return; | |
548 | hash_preload(vma->vm_mm, address, access, trap); | |
549 | #endif /* CONFIG_PPC_STD_MMU */ | |
14cf11af | 550 | } |