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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 | |
14cf11af PM |
8 | * PPC44x/36-bit changes by Matt Porter (mporter@mvista.com) |
9 | * | |
10 | * Derived from "arch/i386/mm/init.c" | |
11 | * Copyright (C) 1991, 1992, 1993, 1994 Linus Torvalds | |
12 | * | |
13 | * This program is free software; you can redistribute it and/or | |
14 | * modify it under the terms of the GNU General Public License | |
15 | * as published by the Free Software Foundation; either version | |
16 | * 2 of the License, or (at your option) any later version. | |
17 | * | |
18 | */ | |
19 | ||
14cf11af PM |
20 | #include <linux/module.h> |
21 | #include <linux/sched.h> | |
22 | #include <linux/kernel.h> | |
23 | #include <linux/errno.h> | |
24 | #include <linux/string.h> | |
25 | #include <linux/types.h> | |
26 | #include <linux/mm.h> | |
27 | #include <linux/stddef.h> | |
28 | #include <linux/init.h> | |
29 | #include <linux/bootmem.h> | |
30 | #include <linux/highmem.h> | |
31 | #include <linux/initrd.h> | |
32 | #include <linux/pagemap.h> | |
4e8ad3e8 | 33 | #include <linux/suspend.h> |
14cf11af PM |
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> | |
7c8c6b97 PM |
45 | #include <asm/lmb.h> |
46 | #include <asm/sections.h> | |
ab1f9dac | 47 | #include <asm/vdso.h> |
14cf11af | 48 | |
14cf11af PM |
49 | #include "mmu_decl.h" |
50 | ||
51 | #ifndef CPU_FTR_COHERENT_ICACHE | |
52 | #define CPU_FTR_COHERENT_ICACHE 0 /* XXX for now */ | |
53 | #define CPU_FTR_NOEXECUTE 0 | |
54 | #endif | |
55 | ||
7c8c6b97 PM |
56 | int init_bootmem_done; |
57 | int mem_init_done; | |
cf00a8d1 | 58 | unsigned long memory_limit; |
7c8c6b97 | 59 | |
14cf11af PM |
60 | int page_is_ram(unsigned long pfn) |
61 | { | |
62 | unsigned long paddr = (pfn << PAGE_SHIFT); | |
63 | ||
64 | #ifndef CONFIG_PPC64 /* XXX for now */ | |
65 | return paddr < __pa(high_memory); | |
66 | #else | |
67 | int i; | |
68 | for (i=0; i < lmb.memory.cnt; i++) { | |
69 | unsigned long base; | |
70 | ||
71 | base = lmb.memory.region[i].base; | |
72 | ||
73 | if ((paddr >= base) && | |
74 | (paddr < (base + lmb.memory.region[i].size))) { | |
75 | return 1; | |
76 | } | |
77 | } | |
78 | ||
79 | return 0; | |
80 | #endif | |
81 | } | |
14cf11af | 82 | |
8b150478 | 83 | pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn, |
14cf11af PM |
84 | unsigned long size, pgprot_t vma_prot) |
85 | { | |
86 | if (ppc_md.phys_mem_access_prot) | |
8b150478 | 87 | return ppc_md.phys_mem_access_prot(file, pfn, size, vma_prot); |
14cf11af | 88 | |
8b150478 | 89 | if (!page_is_ram(pfn)) |
14cf11af PM |
90 | vma_prot = __pgprot(pgprot_val(vma_prot) |
91 | | _PAGE_GUARDED | _PAGE_NO_CACHE); | |
92 | return vma_prot; | |
93 | } | |
94 | EXPORT_SYMBOL(phys_mem_access_prot); | |
95 | ||
23fd0775 PM |
96 | #ifdef CONFIG_MEMORY_HOTPLUG |
97 | ||
98 | void online_page(struct page *page) | |
99 | { | |
100 | ClearPageReserved(page); | |
7835e98b | 101 | init_page_count(page); |
70dc991d | 102 | __free_page(page); |
23fd0775 PM |
103 | totalram_pages++; |
104 | num_physpages++; | |
105 | } | |
106 | ||
bc02af93 YG |
107 | #ifdef CONFIG_NUMA |
108 | int memory_add_physaddr_to_nid(u64 start) | |
109 | { | |
110 | return hot_add_scn_to_nid(start); | |
111 | } | |
112 | #endif | |
113 | ||
114 | int __devinit arch_add_memory(int nid, u64 start, u64 size) | |
23fd0775 | 115 | { |
237a0989 | 116 | struct pglist_data *pgdata; |
23fd0775 PM |
117 | struct zone *zone; |
118 | unsigned long start_pfn = start >> PAGE_SHIFT; | |
119 | unsigned long nr_pages = size >> PAGE_SHIFT; | |
120 | ||
237a0989 MK |
121 | pgdata = NODE_DATA(nid); |
122 | ||
2d0eee14 | 123 | start = (unsigned long)__va(start); |
54b79248 MK |
124 | create_section_mapping(start, start + size); |
125 | ||
23fd0775 PM |
126 | /* this should work for most non-highmem platforms */ |
127 | zone = pgdata->node_zones; | |
128 | ||
129 | return __add_pages(zone, start_pfn, nr_pages); | |
23fd0775 PM |
130 | } |
131 | ||
aa620abe BP |
132 | #ifdef CONFIG_MEMORY_HOTREMOVE |
133 | int remove_memory(u64 start, u64 size) | |
134 | { | |
135 | unsigned long start_pfn, end_pfn; | |
136 | int ret; | |
137 | ||
138 | start_pfn = start >> PAGE_SHIFT; | |
139 | end_pfn = start_pfn + (size >> PAGE_SHIFT); | |
140 | ret = offline_pages(start_pfn, end_pfn, 120 * HZ); | |
141 | if (ret) | |
142 | goto out; | |
143 | /* Arch-specific calls go here - next patch */ | |
144 | out: | |
145 | return ret; | |
146 | } | |
147 | #endif /* CONFIG_MEMORY_HOTREMOVE */ | |
23fd0775 PM |
148 | #endif /* CONFIG_MEMORY_HOTPLUG */ |
149 | ||
14cf11af PM |
150 | void show_mem(void) |
151 | { | |
152 | unsigned long total = 0, reserved = 0; | |
153 | unsigned long shared = 0, cached = 0; | |
154 | unsigned long highmem = 0; | |
155 | struct page *page; | |
156 | pg_data_t *pgdat; | |
157 | unsigned long i; | |
158 | ||
159 | printk("Mem-info:\n"); | |
160 | show_free_areas(); | |
161 | printk("Free swap: %6ldkB\n", nr_swap_pages<<(PAGE_SHIFT-10)); | |
ec936fc5 | 162 | for_each_online_pgdat(pgdat) { |
23fd0775 PM |
163 | unsigned long flags; |
164 | pgdat_resize_lock(pgdat, &flags); | |
14cf11af | 165 | for (i = 0; i < pgdat->node_spanned_pages; i++) { |
fb6d73d3 PM |
166 | if (!pfn_valid(pgdat->node_start_pfn + i)) |
167 | continue; | |
14cf11af PM |
168 | page = pgdat_page_nr(pgdat, i); |
169 | total++; | |
170 | if (PageHighMem(page)) | |
171 | highmem++; | |
172 | if (PageReserved(page)) | |
173 | reserved++; | |
174 | else if (PageSwapCache(page)) | |
175 | cached++; | |
176 | else if (page_count(page)) | |
177 | shared += page_count(page) - 1; | |
178 | } | |
23fd0775 | 179 | pgdat_resize_unlock(pgdat, &flags); |
14cf11af PM |
180 | } |
181 | printk("%ld pages of RAM\n", total); | |
182 | #ifdef CONFIG_HIGHMEM | |
183 | printk("%ld pages of HIGHMEM\n", highmem); | |
184 | #endif | |
185 | printk("%ld reserved pages\n", reserved); | |
186 | printk("%ld pages shared\n", shared); | |
187 | printk("%ld pages swap cached\n", cached); | |
188 | } | |
189 | ||
7c8c6b97 PM |
190 | /* |
191 | * Initialize the bootmem system and give it all the memory we | |
192 | * have available. If we are using highmem, we only put the | |
193 | * lowmem into the bootmem system. | |
194 | */ | |
195 | #ifndef CONFIG_NEED_MULTIPLE_NODES | |
196 | void __init do_init_bootmem(void) | |
197 | { | |
198 | unsigned long i; | |
199 | unsigned long start, bootmap_pages; | |
200 | unsigned long total_pages; | |
201 | int boot_mapsize; | |
202 | ||
203 | max_pfn = total_pages = lmb_end_of_DRAM() >> PAGE_SHIFT; | |
204 | #ifdef CONFIG_HIGHMEM | |
205 | total_pages = total_lowmem >> PAGE_SHIFT; | |
206 | #endif | |
207 | ||
208 | /* | |
209 | * Find an area to use for the bootmem bitmap. Calculate the size of | |
210 | * bitmap required as (Total Memory) / PAGE_SIZE / BITS_PER_BYTE. | |
211 | * Add 1 additional page in case the address isn't page-aligned. | |
212 | */ | |
213 | bootmap_pages = bootmem_bootmap_pages(total_pages); | |
214 | ||
215 | start = lmb_alloc(bootmap_pages << PAGE_SHIFT, PAGE_SIZE); | |
7c8c6b97 PM |
216 | |
217 | boot_mapsize = init_bootmem(start >> PAGE_SHIFT, total_pages); | |
218 | ||
c67c3cb4 MG |
219 | /* Add active regions with valid PFNs */ |
220 | for (i = 0; i < lmb.memory.cnt; i++) { | |
221 | unsigned long start_pfn, end_pfn; | |
222 | start_pfn = lmb.memory.region[i].base >> PAGE_SHIFT; | |
223 | end_pfn = start_pfn + lmb_size_pages(&lmb.memory, i); | |
224 | add_active_range(0, start_pfn, end_pfn); | |
225 | } | |
226 | ||
7c8c6b97 PM |
227 | /* Add all physical memory to the bootmem map, mark each area |
228 | * present. | |
229 | */ | |
7c8c6b97 | 230 | #ifdef CONFIG_HIGHMEM |
c67c3cb4 | 231 | free_bootmem_with_active_regions(0, total_lowmem >> PAGE_SHIFT); |
f98eeb4e KG |
232 | |
233 | /* reserve the sections we're already using */ | |
234 | for (i = 0; i < lmb.reserved.cnt; i++) { | |
235 | unsigned long addr = lmb.reserved.region[i].base + | |
236 | lmb_size_bytes(&lmb.reserved, i) - 1; | |
237 | if (addr < total_lowmem) | |
238 | reserve_bootmem(lmb.reserved.region[i].base, | |
72a7fe39 BW |
239 | lmb_size_bytes(&lmb.reserved, i), |
240 | BOOTMEM_DEFAULT); | |
f98eeb4e KG |
241 | else if (lmb.reserved.region[i].base < total_lowmem) { |
242 | unsigned long adjusted_size = total_lowmem - | |
243 | lmb.reserved.region[i].base; | |
244 | reserve_bootmem(lmb.reserved.region[i].base, | |
72a7fe39 | 245 | adjusted_size, BOOTMEM_DEFAULT); |
f98eeb4e KG |
246 | } |
247 | } | |
c67c3cb4 MG |
248 | #else |
249 | free_bootmem_with_active_regions(0, max_pfn); | |
7c8c6b97 PM |
250 | |
251 | /* reserve the sections we're already using */ | |
252 | for (i = 0; i < lmb.reserved.cnt; i++) | |
253 | reserve_bootmem(lmb.reserved.region[i].base, | |
72a7fe39 BW |
254 | lmb_size_bytes(&lmb.reserved, i), |
255 | BOOTMEM_DEFAULT); | |
7c8c6b97 | 256 | |
f98eeb4e | 257 | #endif |
7c8c6b97 | 258 | /* XXX need to clip this if using highmem? */ |
c67c3cb4 MG |
259 | sparse_memory_present_with_active_regions(0); |
260 | ||
7c8c6b97 PM |
261 | init_bootmem_done = 1; |
262 | } | |
263 | ||
4e8ad3e8 JB |
264 | /* mark pages that don't exist as nosave */ |
265 | static int __init mark_nonram_nosave(void) | |
266 | { | |
267 | unsigned long lmb_next_region_start_pfn, | |
268 | lmb_region_max_pfn; | |
269 | int i; | |
270 | ||
271 | for (i = 0; i < lmb.memory.cnt - 1; i++) { | |
272 | lmb_region_max_pfn = | |
273 | (lmb.memory.region[i].base >> PAGE_SHIFT) + | |
274 | (lmb.memory.region[i].size >> PAGE_SHIFT); | |
275 | lmb_next_region_start_pfn = | |
276 | lmb.memory.region[i+1].base >> PAGE_SHIFT; | |
277 | ||
278 | if (lmb_region_max_pfn < lmb_next_region_start_pfn) | |
279 | register_nosave_region(lmb_region_max_pfn, | |
280 | lmb_next_region_start_pfn); | |
281 | } | |
282 | ||
283 | return 0; | |
284 | } | |
285 | ||
7c8c6b97 PM |
286 | /* |
287 | * paging_init() sets up the page tables - in fact we've already done this. | |
288 | */ | |
289 | void __init paging_init(void) | |
290 | { | |
7c8c6b97 PM |
291 | unsigned long total_ram = lmb_phys_mem_size(); |
292 | unsigned long top_of_ram = lmb_end_of_DRAM(); | |
c67c3cb4 | 293 | unsigned long max_zone_pfns[MAX_NR_ZONES]; |
7c8c6b97 PM |
294 | |
295 | #ifdef CONFIG_HIGHMEM | |
296 | map_page(PKMAP_BASE, 0, 0); /* XXX gross */ | |
5453e772 BH |
297 | pkmap_page_table = pte_offset_kernel(pmd_offset(pud_offset(pgd_offset_k |
298 | (PKMAP_BASE), PKMAP_BASE), PKMAP_BASE), PKMAP_BASE); | |
7c8c6b97 | 299 | map_page(KMAP_FIX_BEGIN, 0, 0); /* XXX gross */ |
5453e772 BH |
300 | kmap_pte = pte_offset_kernel(pmd_offset(pud_offset(pgd_offset_k |
301 | (KMAP_FIX_BEGIN), KMAP_FIX_BEGIN), KMAP_FIX_BEGIN), | |
302 | KMAP_FIX_BEGIN); | |
7c8c6b97 PM |
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); |
6391af17 | 310 | memset(max_zone_pfns, 0, sizeof(max_zone_pfns)); |
7c8c6b97 | 311 | #ifdef CONFIG_HIGHMEM |
6391af17 MG |
312 | max_zone_pfns[ZONE_DMA] = total_lowmem >> PAGE_SHIFT; |
313 | max_zone_pfns[ZONE_HIGHMEM] = top_of_ram >> PAGE_SHIFT; | |
7c8c6b97 | 314 | #else |
6391af17 | 315 | max_zone_pfns[ZONE_DMA] = top_of_ram >> PAGE_SHIFT; |
c67c3cb4 MG |
316 | #endif |
317 | free_area_init_nodes(max_zone_pfns); | |
4e8ad3e8 JB |
318 | |
319 | mark_nonram_nosave(); | |
7c8c6b97 PM |
320 | } |
321 | #endif /* ! CONFIG_NEED_MULTIPLE_NODES */ | |
322 | ||
323 | void __init mem_init(void) | |
324 | { | |
325 | #ifdef CONFIG_NEED_MULTIPLE_NODES | |
326 | int nid; | |
327 | #endif | |
328 | pg_data_t *pgdat; | |
329 | unsigned long i; | |
330 | struct page *page; | |
331 | unsigned long reservedpages = 0, codesize, initsize, datasize, bsssize; | |
332 | ||
fb6d73d3 | 333 | num_physpages = lmb.memory.size >> PAGE_SHIFT; |
7c8c6b97 PM |
334 | high_memory = (void *) __va(max_low_pfn * PAGE_SIZE); |
335 | ||
336 | #ifdef CONFIG_NEED_MULTIPLE_NODES | |
337 | for_each_online_node(nid) { | |
338 | if (NODE_DATA(nid)->node_spanned_pages != 0) { | |
c258dd40 | 339 | printk("freeing bootmem node %d\n", nid); |
7c8c6b97 PM |
340 | totalram_pages += |
341 | free_all_bootmem_node(NODE_DATA(nid)); | |
342 | } | |
343 | } | |
344 | #else | |
fb6d73d3 | 345 | max_mapnr = max_pfn; |
7c8c6b97 PM |
346 | totalram_pages += free_all_bootmem(); |
347 | #endif | |
ec936fc5 | 348 | for_each_online_pgdat(pgdat) { |
7c8c6b97 | 349 | for (i = 0; i < pgdat->node_spanned_pages; i++) { |
fb6d73d3 PM |
350 | if (!pfn_valid(pgdat->node_start_pfn + i)) |
351 | continue; | |
7c8c6b97 PM |
352 | page = pgdat_page_nr(pgdat, i); |
353 | if (PageReserved(page)) | |
354 | reservedpages++; | |
355 | } | |
356 | } | |
357 | ||
358 | codesize = (unsigned long)&_sdata - (unsigned long)&_stext; | |
bcb35576 | 359 | datasize = (unsigned long)&_edata - (unsigned long)&_sdata; |
7c8c6b97 PM |
360 | initsize = (unsigned long)&__init_end - (unsigned long)&__init_begin; |
361 | bsssize = (unsigned long)&__bss_stop - (unsigned long)&__bss_start; | |
362 | ||
363 | #ifdef CONFIG_HIGHMEM | |
364 | { | |
365 | unsigned long pfn, highmem_mapnr; | |
366 | ||
367 | highmem_mapnr = total_lowmem >> PAGE_SHIFT; | |
368 | for (pfn = highmem_mapnr; pfn < max_mapnr; ++pfn) { | |
369 | struct page *page = pfn_to_page(pfn); | |
f98eeb4e KG |
370 | if (lmb_is_reserved(pfn << PAGE_SHIFT)) |
371 | continue; | |
7c8c6b97 | 372 | ClearPageReserved(page); |
7835e98b | 373 | init_page_count(page); |
7c8c6b97 PM |
374 | __free_page(page); |
375 | totalhigh_pages++; | |
f98eeb4e | 376 | reservedpages--; |
7c8c6b97 PM |
377 | } |
378 | totalram_pages += totalhigh_pages; | |
e110b281 | 379 | printk(KERN_DEBUG "High memory: %luk\n", |
7c8c6b97 PM |
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; | |
7c8c6b97 PM |
395 | } |
396 | ||
14cf11af PM |
397 | /* |
398 | * This is called when a page has been modified by the kernel. | |
399 | * It just marks the page as not i-cache clean. We do the i-cache | |
400 | * flush later when the page is given to a user process, if necessary. | |
401 | */ | |
402 | void flush_dcache_page(struct page *page) | |
403 | { | |
404 | if (cpu_has_feature(CPU_FTR_COHERENT_ICACHE)) | |
405 | return; | |
406 | /* avoid an atomic op if possible */ | |
407 | if (test_bit(PG_arch_1, &page->flags)) | |
408 | clear_bit(PG_arch_1, &page->flags); | |
409 | } | |
410 | EXPORT_SYMBOL(flush_dcache_page); | |
411 | ||
412 | void flush_dcache_icache_page(struct page *page) | |
413 | { | |
414 | #ifdef CONFIG_BOOKE | |
415 | void *start = kmap_atomic(page, KM_PPC_SYNC_ICACHE); | |
416 | __flush_dcache_icache(start); | |
417 | kunmap_atomic(start, KM_PPC_SYNC_ICACHE); | |
ab1f9dac | 418 | #elif defined(CONFIG_8xx) || defined(CONFIG_PPC64) |
14cf11af PM |
419 | /* On 8xx there is no need to kmap since highmem is not supported */ |
420 | __flush_dcache_icache(page_address(page)); | |
421 | #else | |
422 | __flush_dcache_icache_phys(page_to_pfn(page) << PAGE_SHIFT); | |
423 | #endif | |
424 | ||
425 | } | |
426 | void clear_user_page(void *page, unsigned long vaddr, struct page *pg) | |
427 | { | |
428 | clear_page(page); | |
429 | ||
14cf11af PM |
430 | /* |
431 | * We shouldnt have to do this, but some versions of glibc | |
432 | * require it (ld.so assumes zero filled pages are icache clean) | |
433 | * - Anton | |
434 | */ | |
09f5dc44 | 435 | flush_dcache_page(pg); |
14cf11af PM |
436 | } |
437 | EXPORT_SYMBOL(clear_user_page); | |
438 | ||
439 | void copy_user_page(void *vto, void *vfrom, unsigned long vaddr, | |
440 | struct page *pg) | |
441 | { | |
442 | copy_page(vto, vfrom); | |
443 | ||
444 | /* | |
445 | * We should be able to use the following optimisation, however | |
446 | * there are two problems. | |
447 | * Firstly a bug in some versions of binutils meant PLT sections | |
448 | * were not marked executable. | |
449 | * Secondly the first word in the GOT section is blrl, used | |
450 | * to establish the GOT address. Until recently the GOT was | |
451 | * not marked executable. | |
452 | * - Anton | |
453 | */ | |
454 | #if 0 | |
455 | if (!vma->vm_file && ((vma->vm_flags & VM_EXEC) == 0)) | |
456 | return; | |
457 | #endif | |
458 | ||
09f5dc44 | 459 | flush_dcache_page(pg); |
14cf11af PM |
460 | } |
461 | ||
462 | void flush_icache_user_range(struct vm_area_struct *vma, struct page *page, | |
463 | unsigned long addr, int len) | |
464 | { | |
465 | unsigned long maddr; | |
466 | ||
467 | maddr = (unsigned long) kmap(page) + (addr & ~PAGE_MASK); | |
468 | flush_icache_range(maddr, maddr + len); | |
469 | kunmap(page); | |
470 | } | |
471 | EXPORT_SYMBOL(flush_icache_user_range); | |
472 | ||
473 | /* | |
474 | * This is called at the end of handling a user page fault, when the | |
475 | * fault has been handled by updating a PTE in the linux page tables. | |
476 | * We use it to preload an HPTE into the hash table corresponding to | |
477 | * the updated linux PTE. | |
478 | * | |
01edcd89 | 479 | * This must always be called with the pte lock held. |
14cf11af PM |
480 | */ |
481 | void update_mmu_cache(struct vm_area_struct *vma, unsigned long address, | |
482 | pte_t pte) | |
483 | { | |
3c726f8d BH |
484 | #ifdef CONFIG_PPC_STD_MMU |
485 | unsigned long access = 0, trap; | |
14cf11af | 486 | #endif |
3c726f8d | 487 | unsigned long pfn = pte_pfn(pte); |
14cf11af PM |
488 | |
489 | /* handle i-cache coherency */ | |
490 | if (!cpu_has_feature(CPU_FTR_COHERENT_ICACHE) && | |
491 | !cpu_has_feature(CPU_FTR_NOEXECUTE) && | |
492 | pfn_valid(pfn)) { | |
493 | struct page *page = pfn_to_page(pfn); | |
dbbb06b7 VB |
494 | #ifdef CONFIG_8xx |
495 | /* On 8xx, cache control instructions (particularly | |
496 | * "dcbst" from flush_dcache_icache) fault as write | |
497 | * operation if there is an unpopulated TLB entry | |
498 | * for the address in question. To workaround that, | |
499 | * we invalidate the TLB here, thus avoiding dcbst | |
500 | * misbehaviour. | |
501 | */ | |
0b47759d | 502 | _tlbie(address, 0 /* 8xx doesn't care about PID */); |
dbbb06b7 | 503 | #endif |
551ed332 SW |
504 | /* The _PAGE_USER test should really be _PAGE_EXEC, but |
505 | * older glibc versions execute some code from no-exec | |
506 | * pages, which for now we are supporting. If exec-only | |
507 | * pages are ever implemented, this will have to change. | |
508 | */ | |
509 | if (!PageReserved(page) && (pte_val(pte) & _PAGE_USER) | |
14cf11af PM |
510 | && !test_bit(PG_arch_1, &page->flags)) { |
511 | if (vma->vm_mm == current->active_mm) { | |
14cf11af PM |
512 | __flush_dcache_icache((void *) address); |
513 | } else | |
514 | flush_dcache_icache_page(page); | |
515 | set_bit(PG_arch_1, &page->flags); | |
516 | } | |
517 | } | |
518 | ||
519 | #ifdef CONFIG_PPC_STD_MMU | |
520 | /* We only want HPTEs for linux PTEs that have _PAGE_ACCESSED set */ | |
521 | if (!pte_young(pte) || address >= TASK_SIZE) | |
522 | return; | |
14cf11af | 523 | |
3c726f8d BH |
524 | /* We try to figure out if we are coming from an instruction |
525 | * access fault and pass that down to __hash_page so we avoid | |
526 | * double-faulting on execution of fresh text. We have to test | |
527 | * for regs NULL since init will get here first thing at boot | |
528 | * | |
529 | * We also avoid filling the hash if not coming from a fault | |
530 | */ | |
531 | if (current->thread.regs == NULL) | |
14cf11af | 532 | return; |
3c726f8d BH |
533 | trap = TRAP(current->thread.regs); |
534 | if (trap == 0x400) | |
535 | access |= _PAGE_EXEC; | |
536 | else if (trap != 0x300) | |
537 | return; | |
538 | hash_preload(vma->vm_mm, address, access, trap); | |
539 | #endif /* CONFIG_PPC_STD_MMU */ | |
14cf11af | 540 | } |