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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 | ||
14cf11af PM |
21 | #include <linux/module.h> |
22 | #include <linux/sched.h> | |
23 | #include <linux/kernel.h> | |
24 | #include <linux/errno.h> | |
25 | #include <linux/string.h> | |
26 | #include <linux/types.h> | |
27 | #include <linux/mm.h> | |
28 | #include <linux/stddef.h> | |
29 | #include <linux/init.h> | |
30 | #include <linux/bootmem.h> | |
31 | #include <linux/highmem.h> | |
32 | #include <linux/initrd.h> | |
33 | #include <linux/pagemap.h> | |
34 | ||
35 | #include <asm/pgalloc.h> | |
36 | #include <asm/prom.h> | |
37 | #include <asm/io.h> | |
38 | #include <asm/mmu_context.h> | |
39 | #include <asm/pgtable.h> | |
40 | #include <asm/mmu.h> | |
41 | #include <asm/smp.h> | |
42 | #include <asm/machdep.h> | |
43 | #include <asm/btext.h> | |
44 | #include <asm/tlb.h> | |
14cf11af | 45 | #include <asm/prom.h> |
7c8c6b97 PM |
46 | #include <asm/lmb.h> |
47 | #include <asm/sections.h> | |
ab1f9dac | 48 | #include <asm/vdso.h> |
14cf11af | 49 | |
14cf11af PM |
50 | #include "mmu_decl.h" |
51 | ||
52 | #ifndef CPU_FTR_COHERENT_ICACHE | |
53 | #define CPU_FTR_COHERENT_ICACHE 0 /* XXX for now */ | |
54 | #define CPU_FTR_NOEXECUTE 0 | |
55 | #endif | |
56 | ||
7c8c6b97 PM |
57 | int init_bootmem_done; |
58 | int mem_init_done; | |
cf00a8d1 | 59 | unsigned long memory_limit; |
7c8c6b97 | 60 | |
3c726f8d BH |
61 | extern void hash_preload(struct mm_struct *mm, unsigned long ea, |
62 | unsigned long access, unsigned long trap); | |
63 | ||
14cf11af PM |
64 | /* |
65 | * This is called by /dev/mem to know if a given address has to | |
66 | * be mapped non-cacheable or not | |
67 | */ | |
68 | int page_is_ram(unsigned long pfn) | |
69 | { | |
70 | unsigned long paddr = (pfn << PAGE_SHIFT); | |
71 | ||
72 | #ifndef CONFIG_PPC64 /* XXX for now */ | |
73 | return paddr < __pa(high_memory); | |
74 | #else | |
75 | int i; | |
76 | for (i=0; i < lmb.memory.cnt; i++) { | |
77 | unsigned long base; | |
78 | ||
79 | base = lmb.memory.region[i].base; | |
80 | ||
81 | if ((paddr >= base) && | |
82 | (paddr < (base + lmb.memory.region[i].size))) { | |
83 | return 1; | |
84 | } | |
85 | } | |
86 | ||
87 | return 0; | |
88 | #endif | |
89 | } | |
90 | EXPORT_SYMBOL(page_is_ram); | |
91 | ||
8b150478 | 92 | pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn, |
14cf11af PM |
93 | unsigned long size, pgprot_t vma_prot) |
94 | { | |
95 | if (ppc_md.phys_mem_access_prot) | |
8b150478 | 96 | return ppc_md.phys_mem_access_prot(file, pfn, size, vma_prot); |
14cf11af | 97 | |
8b150478 | 98 | if (!page_is_ram(pfn)) |
14cf11af PM |
99 | vma_prot = __pgprot(pgprot_val(vma_prot) |
100 | | _PAGE_GUARDED | _PAGE_NO_CACHE); | |
101 | return vma_prot; | |
102 | } | |
103 | EXPORT_SYMBOL(phys_mem_access_prot); | |
104 | ||
23fd0775 PM |
105 | #ifdef CONFIG_MEMORY_HOTPLUG |
106 | ||
107 | void online_page(struct page *page) | |
108 | { | |
109 | ClearPageReserved(page); | |
7835e98b | 110 | init_page_count(page); |
70dc991d | 111 | __free_page(page); |
23fd0775 PM |
112 | totalram_pages++; |
113 | num_physpages++; | |
114 | } | |
115 | ||
bc02af93 YG |
116 | #ifdef CONFIG_NUMA |
117 | int memory_add_physaddr_to_nid(u64 start) | |
118 | { | |
119 | return hot_add_scn_to_nid(start); | |
120 | } | |
121 | #endif | |
122 | ||
123 | int __devinit arch_add_memory(int nid, u64 start, u64 size) | |
23fd0775 | 124 | { |
237a0989 | 125 | struct pglist_data *pgdata; |
23fd0775 PM |
126 | struct zone *zone; |
127 | unsigned long start_pfn = start >> PAGE_SHIFT; | |
128 | unsigned long nr_pages = size >> PAGE_SHIFT; | |
129 | ||
237a0989 MK |
130 | pgdata = NODE_DATA(nid); |
131 | ||
2d0eee14 | 132 | start = (unsigned long)__va(start); |
54b79248 MK |
133 | create_section_mapping(start, start + size); |
134 | ||
23fd0775 PM |
135 | /* this should work for most non-highmem platforms */ |
136 | zone = pgdata->node_zones; | |
137 | ||
138 | return __add_pages(zone, start_pfn, nr_pages); | |
139 | ||
140 | return 0; | |
141 | } | |
142 | ||
143 | /* | |
144 | * First pass at this code will check to determine if the remove | |
145 | * request is within the RMO. Do not allow removal within the RMO. | |
146 | */ | |
147 | int __devinit remove_memory(u64 start, u64 size) | |
148 | { | |
149 | struct zone *zone; | |
150 | unsigned long start_pfn, end_pfn, nr_pages; | |
151 | ||
152 | start_pfn = start >> PAGE_SHIFT; | |
153 | nr_pages = size >> PAGE_SHIFT; | |
154 | end_pfn = start_pfn + nr_pages; | |
155 | ||
156 | printk("%s(): Attempting to remove memoy in range " | |
157 | "%lx to %lx\n", __func__, start, start+size); | |
158 | /* | |
159 | * check for range within RMO | |
160 | */ | |
161 | zone = page_zone(pfn_to_page(start_pfn)); | |
162 | ||
163 | printk("%s(): memory will be removed from " | |
164 | "the %s zone\n", __func__, zone->name); | |
165 | ||
166 | /* | |
167 | * not handling removing memory ranges that | |
168 | * overlap multiple zones yet | |
169 | */ | |
170 | if (end_pfn > (zone->zone_start_pfn + zone->spanned_pages)) | |
171 | goto overlap; | |
172 | ||
173 | /* make sure it is NOT in RMO */ | |
174 | if ((start < lmb.rmo_size) || ((start+size) < lmb.rmo_size)) { | |
175 | printk("%s(): range to be removed must NOT be in RMO!\n", | |
176 | __func__); | |
177 | goto in_rmo; | |
178 | } | |
179 | ||
180 | return __remove_pages(zone, start_pfn, nr_pages); | |
181 | ||
182 | overlap: | |
183 | printk("%s(): memory range to be removed overlaps " | |
184 | "multiple zones!!!\n", __func__); | |
185 | in_rmo: | |
186 | return -1; | |
187 | } | |
188 | #endif /* CONFIG_MEMORY_HOTPLUG */ | |
189 | ||
14cf11af PM |
190 | void show_mem(void) |
191 | { | |
192 | unsigned long total = 0, reserved = 0; | |
193 | unsigned long shared = 0, cached = 0; | |
194 | unsigned long highmem = 0; | |
195 | struct page *page; | |
196 | pg_data_t *pgdat; | |
197 | unsigned long i; | |
198 | ||
199 | printk("Mem-info:\n"); | |
200 | show_free_areas(); | |
201 | printk("Free swap: %6ldkB\n", nr_swap_pages<<(PAGE_SHIFT-10)); | |
ec936fc5 | 202 | for_each_online_pgdat(pgdat) { |
23fd0775 PM |
203 | unsigned long flags; |
204 | pgdat_resize_lock(pgdat, &flags); | |
14cf11af | 205 | for (i = 0; i < pgdat->node_spanned_pages; i++) { |
fb6d73d3 PM |
206 | if (!pfn_valid(pgdat->node_start_pfn + i)) |
207 | continue; | |
14cf11af PM |
208 | page = pgdat_page_nr(pgdat, i); |
209 | total++; | |
210 | if (PageHighMem(page)) | |
211 | highmem++; | |
212 | if (PageReserved(page)) | |
213 | reserved++; | |
214 | else if (PageSwapCache(page)) | |
215 | cached++; | |
216 | else if (page_count(page)) | |
217 | shared += page_count(page) - 1; | |
218 | } | |
23fd0775 | 219 | pgdat_resize_unlock(pgdat, &flags); |
14cf11af PM |
220 | } |
221 | printk("%ld pages of RAM\n", total); | |
222 | #ifdef CONFIG_HIGHMEM | |
223 | printk("%ld pages of HIGHMEM\n", highmem); | |
224 | #endif | |
225 | printk("%ld reserved pages\n", reserved); | |
226 | printk("%ld pages shared\n", shared); | |
227 | printk("%ld pages swap cached\n", cached); | |
228 | } | |
229 | ||
7c8c6b97 PM |
230 | /* |
231 | * Initialize the bootmem system and give it all the memory we | |
232 | * have available. If we are using highmem, we only put the | |
233 | * lowmem into the bootmem system. | |
234 | */ | |
235 | #ifndef CONFIG_NEED_MULTIPLE_NODES | |
236 | void __init do_init_bootmem(void) | |
237 | { | |
238 | unsigned long i; | |
239 | unsigned long start, bootmap_pages; | |
240 | unsigned long total_pages; | |
241 | int boot_mapsize; | |
242 | ||
243 | max_pfn = total_pages = lmb_end_of_DRAM() >> PAGE_SHIFT; | |
244 | #ifdef CONFIG_HIGHMEM | |
245 | total_pages = total_lowmem >> PAGE_SHIFT; | |
246 | #endif | |
247 | ||
248 | /* | |
249 | * Find an area to use for the bootmem bitmap. Calculate the size of | |
250 | * bitmap required as (Total Memory) / PAGE_SIZE / BITS_PER_BYTE. | |
251 | * Add 1 additional page in case the address isn't page-aligned. | |
252 | */ | |
253 | bootmap_pages = bootmem_bootmap_pages(total_pages); | |
254 | ||
255 | start = lmb_alloc(bootmap_pages << PAGE_SHIFT, PAGE_SIZE); | |
7c8c6b97 PM |
256 | |
257 | boot_mapsize = init_bootmem(start >> PAGE_SHIFT, total_pages); | |
258 | ||
c67c3cb4 MG |
259 | /* Add active regions with valid PFNs */ |
260 | for (i = 0; i < lmb.memory.cnt; i++) { | |
261 | unsigned long start_pfn, end_pfn; | |
262 | start_pfn = lmb.memory.region[i].base >> PAGE_SHIFT; | |
263 | end_pfn = start_pfn + lmb_size_pages(&lmb.memory, i); | |
264 | add_active_range(0, start_pfn, end_pfn); | |
265 | } | |
266 | ||
7c8c6b97 PM |
267 | /* Add all physical memory to the bootmem map, mark each area |
268 | * present. | |
269 | */ | |
7c8c6b97 | 270 | #ifdef CONFIG_HIGHMEM |
c67c3cb4 MG |
271 | free_bootmem_with_active_regions(0, total_lowmem >> PAGE_SHIFT); |
272 | #else | |
273 | free_bootmem_with_active_regions(0, max_pfn); | |
7c8c6b97 | 274 | #endif |
7c8c6b97 PM |
275 | |
276 | /* reserve the sections we're already using */ | |
277 | for (i = 0; i < lmb.reserved.cnt; i++) | |
278 | reserve_bootmem(lmb.reserved.region[i].base, | |
279 | lmb_size_bytes(&lmb.reserved, i)); | |
280 | ||
281 | /* XXX need to clip this if using highmem? */ | |
c67c3cb4 MG |
282 | sparse_memory_present_with_active_regions(0); |
283 | ||
7c8c6b97 PM |
284 | init_bootmem_done = 1; |
285 | } | |
286 | ||
287 | /* | |
288 | * paging_init() sets up the page tables - in fact we've already done this. | |
289 | */ | |
290 | void __init paging_init(void) | |
291 | { | |
7c8c6b97 PM |
292 | unsigned long total_ram = lmb_phys_mem_size(); |
293 | unsigned long top_of_ram = lmb_end_of_DRAM(); | |
c67c3cb4 | 294 | unsigned long max_zone_pfns[MAX_NR_ZONES]; |
7c8c6b97 PM |
295 | |
296 | #ifdef CONFIG_HIGHMEM | |
297 | map_page(PKMAP_BASE, 0, 0); /* XXX gross */ | |
298 | pkmap_page_table = pte_offset_kernel(pmd_offset(pgd_offset_k | |
299 | (PKMAP_BASE), PKMAP_BASE), PKMAP_BASE); | |
300 | map_page(KMAP_FIX_BEGIN, 0, 0); /* XXX gross */ | |
301 | kmap_pte = pte_offset_kernel(pmd_offset(pgd_offset_k | |
302 | (KMAP_FIX_BEGIN), KMAP_FIX_BEGIN), KMAP_FIX_BEGIN); | |
303 | kmap_prot = PAGE_KERNEL; | |
304 | #endif /* CONFIG_HIGHMEM */ | |
305 | ||
e110b281 | 306 | printk(KERN_DEBUG "Top of RAM: 0x%lx, Total RAM: 0x%lx\n", |
7c8c6b97 | 307 | top_of_ram, total_ram); |
e110b281 | 308 | printk(KERN_DEBUG "Memory hole size: %ldMB\n", |
7c8c6b97 | 309 | (top_of_ram - total_ram) >> 20); |
7c8c6b97 | 310 | #ifdef CONFIG_HIGHMEM |
c67c3cb4 MG |
311 | max_zone_pfns[0] = total_lowmem >> PAGE_SHIFT; |
312 | max_zone_pfns[1] = top_of_ram >> PAGE_SHIFT; | |
7c8c6b97 | 313 | #else |
c67c3cb4 MG |
314 | max_zone_pfns[0] = top_of_ram >> PAGE_SHIFT; |
315 | #endif | |
316 | free_area_init_nodes(max_zone_pfns); | |
7c8c6b97 PM |
317 | } |
318 | #endif /* ! CONFIG_NEED_MULTIPLE_NODES */ | |
319 | ||
320 | void __init mem_init(void) | |
321 | { | |
322 | #ifdef CONFIG_NEED_MULTIPLE_NODES | |
323 | int nid; | |
324 | #endif | |
325 | pg_data_t *pgdat; | |
326 | unsigned long i; | |
327 | struct page *page; | |
328 | unsigned long reservedpages = 0, codesize, initsize, datasize, bsssize; | |
329 | ||
fb6d73d3 | 330 | num_physpages = lmb.memory.size >> PAGE_SHIFT; |
7c8c6b97 PM |
331 | high_memory = (void *) __va(max_low_pfn * PAGE_SIZE); |
332 | ||
333 | #ifdef CONFIG_NEED_MULTIPLE_NODES | |
334 | for_each_online_node(nid) { | |
335 | if (NODE_DATA(nid)->node_spanned_pages != 0) { | |
c258dd40 | 336 | printk("freeing bootmem node %d\n", nid); |
7c8c6b97 PM |
337 | totalram_pages += |
338 | free_all_bootmem_node(NODE_DATA(nid)); | |
339 | } | |
340 | } | |
341 | #else | |
fb6d73d3 | 342 | max_mapnr = max_pfn; |
7c8c6b97 PM |
343 | totalram_pages += free_all_bootmem(); |
344 | #endif | |
ec936fc5 | 345 | for_each_online_pgdat(pgdat) { |
7c8c6b97 | 346 | for (i = 0; i < pgdat->node_spanned_pages; i++) { |
fb6d73d3 PM |
347 | if (!pfn_valid(pgdat->node_start_pfn + i)) |
348 | continue; | |
7c8c6b97 PM |
349 | page = pgdat_page_nr(pgdat, i); |
350 | if (PageReserved(page)) | |
351 | reservedpages++; | |
352 | } | |
353 | } | |
354 | ||
355 | codesize = (unsigned long)&_sdata - (unsigned long)&_stext; | |
bcb35576 | 356 | datasize = (unsigned long)&_edata - (unsigned long)&_sdata; |
7c8c6b97 PM |
357 | initsize = (unsigned long)&__init_end - (unsigned long)&__init_begin; |
358 | bsssize = (unsigned long)&__bss_stop - (unsigned long)&__bss_start; | |
359 | ||
360 | #ifdef CONFIG_HIGHMEM | |
361 | { | |
362 | unsigned long pfn, highmem_mapnr; | |
363 | ||
364 | highmem_mapnr = total_lowmem >> PAGE_SHIFT; | |
365 | for (pfn = highmem_mapnr; pfn < max_mapnr; ++pfn) { | |
366 | struct page *page = pfn_to_page(pfn); | |
367 | ||
368 | ClearPageReserved(page); | |
7835e98b | 369 | init_page_count(page); |
7c8c6b97 PM |
370 | __free_page(page); |
371 | totalhigh_pages++; | |
372 | } | |
373 | totalram_pages += totalhigh_pages; | |
e110b281 | 374 | printk(KERN_DEBUG "High memory: %luk\n", |
7c8c6b97 PM |
375 | totalhigh_pages << (PAGE_SHIFT-10)); |
376 | } | |
377 | #endif /* CONFIG_HIGHMEM */ | |
378 | ||
379 | printk(KERN_INFO "Memory: %luk/%luk available (%luk kernel code, " | |
380 | "%luk reserved, %luk data, %luk bss, %luk init)\n", | |
381 | (unsigned long)nr_free_pages() << (PAGE_SHIFT-10), | |
382 | num_physpages << (PAGE_SHIFT-10), | |
383 | codesize >> 10, | |
384 | reservedpages << (PAGE_SHIFT-10), | |
385 | datasize >> 10, | |
386 | bsssize >> 10, | |
387 | initsize >> 10); | |
388 | ||
389 | mem_init_done = 1; | |
390 | ||
7c8c6b97 PM |
391 | /* Initialize the vDSO */ |
392 | vdso_init(); | |
7c8c6b97 PM |
393 | } |
394 | ||
14cf11af PM |
395 | /* |
396 | * This is called when a page has been modified by the kernel. | |
397 | * It just marks the page as not i-cache clean. We do the i-cache | |
398 | * flush later when the page is given to a user process, if necessary. | |
399 | */ | |
400 | void flush_dcache_page(struct page *page) | |
401 | { | |
402 | if (cpu_has_feature(CPU_FTR_COHERENT_ICACHE)) | |
403 | return; | |
404 | /* avoid an atomic op if possible */ | |
405 | if (test_bit(PG_arch_1, &page->flags)) | |
406 | clear_bit(PG_arch_1, &page->flags); | |
407 | } | |
408 | EXPORT_SYMBOL(flush_dcache_page); | |
409 | ||
410 | void flush_dcache_icache_page(struct page *page) | |
411 | { | |
412 | #ifdef CONFIG_BOOKE | |
413 | void *start = kmap_atomic(page, KM_PPC_SYNC_ICACHE); | |
414 | __flush_dcache_icache(start); | |
415 | kunmap_atomic(start, KM_PPC_SYNC_ICACHE); | |
ab1f9dac | 416 | #elif defined(CONFIG_8xx) || defined(CONFIG_PPC64) |
14cf11af PM |
417 | /* On 8xx there is no need to kmap since highmem is not supported */ |
418 | __flush_dcache_icache(page_address(page)); | |
419 | #else | |
420 | __flush_dcache_icache_phys(page_to_pfn(page) << PAGE_SHIFT); | |
421 | #endif | |
422 | ||
423 | } | |
424 | void clear_user_page(void *page, unsigned long vaddr, struct page *pg) | |
425 | { | |
426 | clear_page(page); | |
427 | ||
14cf11af PM |
428 | /* |
429 | * We shouldnt have to do this, but some versions of glibc | |
430 | * require it (ld.so assumes zero filled pages are icache clean) | |
431 | * - Anton | |
432 | */ | |
09f5dc44 | 433 | flush_dcache_page(pg); |
14cf11af PM |
434 | } |
435 | EXPORT_SYMBOL(clear_user_page); | |
436 | ||
437 | void copy_user_page(void *vto, void *vfrom, unsigned long vaddr, | |
438 | struct page *pg) | |
439 | { | |
440 | copy_page(vto, vfrom); | |
441 | ||
442 | /* | |
443 | * We should be able to use the following optimisation, however | |
444 | * there are two problems. | |
445 | * Firstly a bug in some versions of binutils meant PLT sections | |
446 | * were not marked executable. | |
447 | * Secondly the first word in the GOT section is blrl, used | |
448 | * to establish the GOT address. Until recently the GOT was | |
449 | * not marked executable. | |
450 | * - Anton | |
451 | */ | |
452 | #if 0 | |
453 | if (!vma->vm_file && ((vma->vm_flags & VM_EXEC) == 0)) | |
454 | return; | |
455 | #endif | |
456 | ||
09f5dc44 | 457 | flush_dcache_page(pg); |
14cf11af PM |
458 | } |
459 | ||
460 | void flush_icache_user_range(struct vm_area_struct *vma, struct page *page, | |
461 | unsigned long addr, int len) | |
462 | { | |
463 | unsigned long maddr; | |
464 | ||
465 | maddr = (unsigned long) kmap(page) + (addr & ~PAGE_MASK); | |
466 | flush_icache_range(maddr, maddr + len); | |
467 | kunmap(page); | |
468 | } | |
469 | EXPORT_SYMBOL(flush_icache_user_range); | |
470 | ||
471 | /* | |
472 | * This is called at the end of handling a user page fault, when the | |
473 | * fault has been handled by updating a PTE in the linux page tables. | |
474 | * We use it to preload an HPTE into the hash table corresponding to | |
475 | * the updated linux PTE. | |
476 | * | |
01edcd89 | 477 | * This must always be called with the pte lock held. |
14cf11af PM |
478 | */ |
479 | void update_mmu_cache(struct vm_area_struct *vma, unsigned long address, | |
480 | pte_t pte) | |
481 | { | |
3c726f8d BH |
482 | #ifdef CONFIG_PPC_STD_MMU |
483 | unsigned long access = 0, trap; | |
14cf11af | 484 | #endif |
3c726f8d | 485 | unsigned long pfn = pte_pfn(pte); |
14cf11af PM |
486 | |
487 | /* handle i-cache coherency */ | |
488 | if (!cpu_has_feature(CPU_FTR_COHERENT_ICACHE) && | |
489 | !cpu_has_feature(CPU_FTR_NOEXECUTE) && | |
490 | pfn_valid(pfn)) { | |
491 | struct page *page = pfn_to_page(pfn); | |
492 | if (!PageReserved(page) | |
493 | && !test_bit(PG_arch_1, &page->flags)) { | |
494 | if (vma->vm_mm == current->active_mm) { | |
495 | #ifdef CONFIG_8xx | |
496 | /* On 8xx, cache control instructions (particularly | |
497 | * "dcbst" from flush_dcache_icache) fault as write | |
498 | * operation if there is an unpopulated TLB entry | |
499 | * for the address in question. To workaround that, | |
500 | * we invalidate the TLB here, thus avoiding dcbst | |
501 | * misbehaviour. | |
502 | */ | |
503 | _tlbie(address); | |
504 | #endif | |
505 | __flush_dcache_icache((void *) address); | |
506 | } else | |
507 | flush_dcache_icache_page(page); | |
508 | set_bit(PG_arch_1, &page->flags); | |
509 | } | |
510 | } | |
511 | ||
512 | #ifdef CONFIG_PPC_STD_MMU | |
513 | /* We only want HPTEs for linux PTEs that have _PAGE_ACCESSED set */ | |
514 | if (!pte_young(pte) || address >= TASK_SIZE) | |
515 | return; | |
14cf11af | 516 | |
3c726f8d BH |
517 | /* We try to figure out if we are coming from an instruction |
518 | * access fault and pass that down to __hash_page so we avoid | |
519 | * double-faulting on execution of fresh text. We have to test | |
520 | * for regs NULL since init will get here first thing at boot | |
521 | * | |
522 | * We also avoid filling the hash if not coming from a fault | |
523 | */ | |
524 | if (current->thread.regs == NULL) | |
14cf11af | 525 | return; |
3c726f8d BH |
526 | trap = TRAP(current->thread.regs); |
527 | if (trap == 0x400) | |
528 | access |= _PAGE_EXEC; | |
529 | else if (trap != 0x300) | |
530 | return; | |
531 | hash_preload(vma->vm_mm, address, access, trap); | |
532 | #endif /* CONFIG_PPC_STD_MMU */ | |
14cf11af | 533 | } |