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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 | 49 | #include <asm/vdso.h> |
14cf11af | 50 | |
14cf11af PM |
51 | #include "mmu_decl.h" |
52 | ||
53 | #ifndef CPU_FTR_COHERENT_ICACHE | |
54 | #define CPU_FTR_COHERENT_ICACHE 0 /* XXX for now */ | |
55 | #define CPU_FTR_NOEXECUTE 0 | |
56 | #endif | |
57 | ||
7c8c6b97 PM |
58 | int init_bootmem_done; |
59 | int mem_init_done; | |
cf00a8d1 | 60 | unsigned long memory_limit; |
7c8c6b97 | 61 | |
3c726f8d BH |
62 | extern void hash_preload(struct mm_struct *mm, unsigned long ea, |
63 | unsigned long access, unsigned long trap); | |
64 | ||
14cf11af PM |
65 | /* |
66 | * This is called by /dev/mem to know if a given address has to | |
67 | * be mapped non-cacheable or not | |
68 | */ | |
69 | int page_is_ram(unsigned long pfn) | |
70 | { | |
71 | unsigned long paddr = (pfn << PAGE_SHIFT); | |
72 | ||
73 | #ifndef CONFIG_PPC64 /* XXX for now */ | |
74 | return paddr < __pa(high_memory); | |
75 | #else | |
76 | int i; | |
77 | for (i=0; i < lmb.memory.cnt; i++) { | |
78 | unsigned long base; | |
79 | ||
80 | base = lmb.memory.region[i].base; | |
81 | ||
82 | if ((paddr >= base) && | |
83 | (paddr < (base + lmb.memory.region[i].size))) { | |
84 | return 1; | |
85 | } | |
86 | } | |
87 | ||
88 | return 0; | |
89 | #endif | |
90 | } | |
91 | EXPORT_SYMBOL(page_is_ram); | |
92 | ||
8b150478 | 93 | pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn, |
14cf11af PM |
94 | unsigned long size, pgprot_t vma_prot) |
95 | { | |
96 | if (ppc_md.phys_mem_access_prot) | |
8b150478 | 97 | return ppc_md.phys_mem_access_prot(file, pfn, size, vma_prot); |
14cf11af | 98 | |
8b150478 | 99 | if (!page_is_ram(pfn)) |
14cf11af PM |
100 | vma_prot = __pgprot(pgprot_val(vma_prot) |
101 | | _PAGE_GUARDED | _PAGE_NO_CACHE); | |
102 | return vma_prot; | |
103 | } | |
104 | EXPORT_SYMBOL(phys_mem_access_prot); | |
105 | ||
23fd0775 PM |
106 | #ifdef CONFIG_MEMORY_HOTPLUG |
107 | ||
108 | void online_page(struct page *page) | |
109 | { | |
110 | ClearPageReserved(page); | |
dd7ccbd3 | 111 | set_page_count(page, 0); |
23fd0775 PM |
112 | free_cold_page(page); |
113 | totalram_pages++; | |
114 | num_physpages++; | |
115 | } | |
116 | ||
117 | /* | |
118 | * This works only for the non-NUMA case. Later, we'll need a lookup | |
119 | * to convert from real physical addresses to nid, that doesn't use | |
120 | * pfn_to_nid(). | |
121 | */ | |
122 | int __devinit add_memory(u64 start, u64 size) | |
123 | { | |
124 | struct pglist_data *pgdata = NODE_DATA(0); | |
125 | struct zone *zone; | |
126 | unsigned long start_pfn = start >> PAGE_SHIFT; | |
127 | unsigned long nr_pages = size >> PAGE_SHIFT; | |
128 | ||
54b79248 MK |
129 | start += KERNELBASE; |
130 | create_section_mapping(start, start + size); | |
131 | ||
23fd0775 PM |
132 | /* this should work for most non-highmem platforms */ |
133 | zone = pgdata->node_zones; | |
134 | ||
135 | return __add_pages(zone, start_pfn, nr_pages); | |
136 | ||
137 | return 0; | |
138 | } | |
139 | ||
140 | /* | |
141 | * First pass at this code will check to determine if the remove | |
142 | * request is within the RMO. Do not allow removal within the RMO. | |
143 | */ | |
144 | int __devinit remove_memory(u64 start, u64 size) | |
145 | { | |
146 | struct zone *zone; | |
147 | unsigned long start_pfn, end_pfn, nr_pages; | |
148 | ||
149 | start_pfn = start >> PAGE_SHIFT; | |
150 | nr_pages = size >> PAGE_SHIFT; | |
151 | end_pfn = start_pfn + nr_pages; | |
152 | ||
153 | printk("%s(): Attempting to remove memoy in range " | |
154 | "%lx to %lx\n", __func__, start, start+size); | |
155 | /* | |
156 | * check for range within RMO | |
157 | */ | |
158 | zone = page_zone(pfn_to_page(start_pfn)); | |
159 | ||
160 | printk("%s(): memory will be removed from " | |
161 | "the %s zone\n", __func__, zone->name); | |
162 | ||
163 | /* | |
164 | * not handling removing memory ranges that | |
165 | * overlap multiple zones yet | |
166 | */ | |
167 | if (end_pfn > (zone->zone_start_pfn + zone->spanned_pages)) | |
168 | goto overlap; | |
169 | ||
170 | /* make sure it is NOT in RMO */ | |
171 | if ((start < lmb.rmo_size) || ((start+size) < lmb.rmo_size)) { | |
172 | printk("%s(): range to be removed must NOT be in RMO!\n", | |
173 | __func__); | |
174 | goto in_rmo; | |
175 | } | |
176 | ||
177 | return __remove_pages(zone, start_pfn, nr_pages); | |
178 | ||
179 | overlap: | |
180 | printk("%s(): memory range to be removed overlaps " | |
181 | "multiple zones!!!\n", __func__); | |
182 | in_rmo: | |
183 | return -1; | |
184 | } | |
185 | #endif /* CONFIG_MEMORY_HOTPLUG */ | |
186 | ||
14cf11af PM |
187 | void show_mem(void) |
188 | { | |
189 | unsigned long total = 0, reserved = 0; | |
190 | unsigned long shared = 0, cached = 0; | |
191 | unsigned long highmem = 0; | |
192 | struct page *page; | |
193 | pg_data_t *pgdat; | |
194 | unsigned long i; | |
195 | ||
196 | printk("Mem-info:\n"); | |
197 | show_free_areas(); | |
198 | printk("Free swap: %6ldkB\n", nr_swap_pages<<(PAGE_SHIFT-10)); | |
199 | for_each_pgdat(pgdat) { | |
23fd0775 PM |
200 | unsigned long flags; |
201 | pgdat_resize_lock(pgdat, &flags); | |
14cf11af | 202 | for (i = 0; i < pgdat->node_spanned_pages; i++) { |
fb6d73d3 PM |
203 | if (!pfn_valid(pgdat->node_start_pfn + i)) |
204 | continue; | |
14cf11af PM |
205 | page = pgdat_page_nr(pgdat, i); |
206 | total++; | |
207 | if (PageHighMem(page)) | |
208 | highmem++; | |
209 | if (PageReserved(page)) | |
210 | reserved++; | |
211 | else if (PageSwapCache(page)) | |
212 | cached++; | |
213 | else if (page_count(page)) | |
214 | shared += page_count(page) - 1; | |
215 | } | |
23fd0775 | 216 | pgdat_resize_unlock(pgdat, &flags); |
14cf11af PM |
217 | } |
218 | printk("%ld pages of RAM\n", total); | |
219 | #ifdef CONFIG_HIGHMEM | |
220 | printk("%ld pages of HIGHMEM\n", highmem); | |
221 | #endif | |
222 | printk("%ld reserved pages\n", reserved); | |
223 | printk("%ld pages shared\n", shared); | |
224 | printk("%ld pages swap cached\n", cached); | |
225 | } | |
226 | ||
7c8c6b97 PM |
227 | /* |
228 | * Initialize the bootmem system and give it all the memory we | |
229 | * have available. If we are using highmem, we only put the | |
230 | * lowmem into the bootmem system. | |
231 | */ | |
232 | #ifndef CONFIG_NEED_MULTIPLE_NODES | |
233 | void __init do_init_bootmem(void) | |
234 | { | |
235 | unsigned long i; | |
236 | unsigned long start, bootmap_pages; | |
237 | unsigned long total_pages; | |
238 | int boot_mapsize; | |
239 | ||
240 | max_pfn = total_pages = lmb_end_of_DRAM() >> PAGE_SHIFT; | |
241 | #ifdef CONFIG_HIGHMEM | |
242 | total_pages = total_lowmem >> PAGE_SHIFT; | |
243 | #endif | |
244 | ||
245 | /* | |
246 | * Find an area to use for the bootmem bitmap. Calculate the size of | |
247 | * bitmap required as (Total Memory) / PAGE_SIZE / BITS_PER_BYTE. | |
248 | * Add 1 additional page in case the address isn't page-aligned. | |
249 | */ | |
250 | bootmap_pages = bootmem_bootmap_pages(total_pages); | |
251 | ||
252 | start = lmb_alloc(bootmap_pages << PAGE_SHIFT, PAGE_SIZE); | |
253 | BUG_ON(!start); | |
254 | ||
255 | boot_mapsize = init_bootmem(start >> PAGE_SHIFT, total_pages); | |
256 | ||
257 | /* Add all physical memory to the bootmem map, mark each area | |
258 | * present. | |
259 | */ | |
260 | for (i = 0; i < lmb.memory.cnt; i++) { | |
261 | unsigned long base = lmb.memory.region[i].base; | |
262 | unsigned long size = lmb_size_bytes(&lmb.memory, i); | |
263 | #ifdef CONFIG_HIGHMEM | |
264 | if (base >= total_lowmem) | |
265 | continue; | |
266 | if (base + size > total_lowmem) | |
267 | size = total_lowmem - base; | |
268 | #endif | |
269 | free_bootmem(base, size); | |
270 | } | |
271 | ||
272 | /* reserve the sections we're already using */ | |
273 | for (i = 0; i < lmb.reserved.cnt; i++) | |
274 | reserve_bootmem(lmb.reserved.region[i].base, | |
275 | lmb_size_bytes(&lmb.reserved, i)); | |
276 | ||
277 | /* XXX need to clip this if using highmem? */ | |
278 | for (i = 0; i < lmb.memory.cnt; i++) | |
279 | memory_present(0, lmb_start_pfn(&lmb.memory, i), | |
280 | lmb_end_pfn(&lmb.memory, i)); | |
281 | init_bootmem_done = 1; | |
282 | } | |
283 | ||
284 | /* | |
285 | * paging_init() sets up the page tables - in fact we've already done this. | |
286 | */ | |
287 | void __init paging_init(void) | |
288 | { | |
289 | unsigned long zones_size[MAX_NR_ZONES]; | |
290 | unsigned long zholes_size[MAX_NR_ZONES]; | |
291 | unsigned long total_ram = lmb_phys_mem_size(); | |
292 | unsigned long top_of_ram = lmb_end_of_DRAM(); | |
293 | ||
294 | #ifdef CONFIG_HIGHMEM | |
295 | map_page(PKMAP_BASE, 0, 0); /* XXX gross */ | |
296 | pkmap_page_table = pte_offset_kernel(pmd_offset(pgd_offset_k | |
297 | (PKMAP_BASE), PKMAP_BASE), PKMAP_BASE); | |
298 | map_page(KMAP_FIX_BEGIN, 0, 0); /* XXX gross */ | |
299 | kmap_pte = pte_offset_kernel(pmd_offset(pgd_offset_k | |
300 | (KMAP_FIX_BEGIN), KMAP_FIX_BEGIN), KMAP_FIX_BEGIN); | |
301 | kmap_prot = PAGE_KERNEL; | |
302 | #endif /* CONFIG_HIGHMEM */ | |
303 | ||
304 | printk(KERN_INFO "Top of RAM: 0x%lx, Total RAM: 0x%lx\n", | |
305 | top_of_ram, total_ram); | |
306 | printk(KERN_INFO "Memory hole size: %ldMB\n", | |
307 | (top_of_ram - total_ram) >> 20); | |
308 | /* | |
309 | * All pages are DMA-able so we put them all in the DMA zone. | |
310 | */ | |
311 | memset(zones_size, 0, sizeof(zones_size)); | |
312 | memset(zholes_size, 0, sizeof(zholes_size)); | |
313 | ||
314 | zones_size[ZONE_DMA] = top_of_ram >> PAGE_SHIFT; | |
315 | zholes_size[ZONE_DMA] = (top_of_ram - total_ram) >> PAGE_SHIFT; | |
316 | ||
317 | #ifdef CONFIG_HIGHMEM | |
318 | zones_size[ZONE_DMA] = total_lowmem >> PAGE_SHIFT; | |
319 | zones_size[ZONE_HIGHMEM] = (total_memory - total_lowmem) >> PAGE_SHIFT; | |
320 | zholes_size[ZONE_HIGHMEM] = (top_of_ram - total_ram) >> PAGE_SHIFT; | |
321 | #else | |
322 | zones_size[ZONE_DMA] = top_of_ram >> PAGE_SHIFT; | |
323 | zholes_size[ZONE_DMA] = (top_of_ram - total_ram) >> PAGE_SHIFT; | |
324 | #endif /* CONFIG_HIGHMEM */ | |
325 | ||
326 | free_area_init_node(0, NODE_DATA(0), zones_size, | |
327 | __pa(PAGE_OFFSET) >> PAGE_SHIFT, zholes_size); | |
328 | } | |
329 | #endif /* ! CONFIG_NEED_MULTIPLE_NODES */ | |
330 | ||
331 | void __init mem_init(void) | |
332 | { | |
333 | #ifdef CONFIG_NEED_MULTIPLE_NODES | |
334 | int nid; | |
335 | #endif | |
336 | pg_data_t *pgdat; | |
337 | unsigned long i; | |
338 | struct page *page; | |
339 | unsigned long reservedpages = 0, codesize, initsize, datasize, bsssize; | |
340 | ||
fb6d73d3 | 341 | num_physpages = lmb.memory.size >> PAGE_SHIFT; |
7c8c6b97 PM |
342 | high_memory = (void *) __va(max_low_pfn * PAGE_SIZE); |
343 | ||
344 | #ifdef CONFIG_NEED_MULTIPLE_NODES | |
345 | for_each_online_node(nid) { | |
346 | if (NODE_DATA(nid)->node_spanned_pages != 0) { | |
347 | printk("freeing bootmem node %x\n", nid); | |
348 | totalram_pages += | |
349 | free_all_bootmem_node(NODE_DATA(nid)); | |
350 | } | |
351 | } | |
352 | #else | |
fb6d73d3 | 353 | max_mapnr = max_pfn; |
7c8c6b97 PM |
354 | totalram_pages += free_all_bootmem(); |
355 | #endif | |
356 | for_each_pgdat(pgdat) { | |
357 | for (i = 0; i < pgdat->node_spanned_pages; i++) { | |
fb6d73d3 PM |
358 | if (!pfn_valid(pgdat->node_start_pfn + i)) |
359 | continue; | |
7c8c6b97 PM |
360 | page = pgdat_page_nr(pgdat, i); |
361 | if (PageReserved(page)) | |
362 | reservedpages++; | |
363 | } | |
364 | } | |
365 | ||
366 | codesize = (unsigned long)&_sdata - (unsigned long)&_stext; | |
bcb35576 | 367 | datasize = (unsigned long)&_edata - (unsigned long)&_sdata; |
7c8c6b97 PM |
368 | initsize = (unsigned long)&__init_end - (unsigned long)&__init_begin; |
369 | bsssize = (unsigned long)&__bss_stop - (unsigned long)&__bss_start; | |
370 | ||
371 | #ifdef CONFIG_HIGHMEM | |
372 | { | |
373 | unsigned long pfn, highmem_mapnr; | |
374 | ||
375 | highmem_mapnr = total_lowmem >> PAGE_SHIFT; | |
376 | for (pfn = highmem_mapnr; pfn < max_mapnr; ++pfn) { | |
377 | struct page *page = pfn_to_page(pfn); | |
378 | ||
379 | ClearPageReserved(page); | |
380 | set_page_count(page, 1); | |
381 | __free_page(page); | |
382 | totalhigh_pages++; | |
383 | } | |
384 | totalram_pages += totalhigh_pages; | |
385 | printk(KERN_INFO "High memory: %luk\n", | |
386 | totalhigh_pages << (PAGE_SHIFT-10)); | |
387 | } | |
388 | #endif /* CONFIG_HIGHMEM */ | |
389 | ||
390 | printk(KERN_INFO "Memory: %luk/%luk available (%luk kernel code, " | |
391 | "%luk reserved, %luk data, %luk bss, %luk init)\n", | |
392 | (unsigned long)nr_free_pages() << (PAGE_SHIFT-10), | |
393 | num_physpages << (PAGE_SHIFT-10), | |
394 | codesize >> 10, | |
395 | reservedpages << (PAGE_SHIFT-10), | |
396 | datasize >> 10, | |
397 | bsssize >> 10, | |
398 | initsize >> 10); | |
399 | ||
400 | mem_init_done = 1; | |
401 | ||
7c8c6b97 PM |
402 | /* Initialize the vDSO */ |
403 | vdso_init(); | |
7c8c6b97 PM |
404 | } |
405 | ||
14cf11af PM |
406 | /* |
407 | * This is called when a page has been modified by the kernel. | |
408 | * It just marks the page as not i-cache clean. We do the i-cache | |
409 | * flush later when the page is given to a user process, if necessary. | |
410 | */ | |
411 | void flush_dcache_page(struct page *page) | |
412 | { | |
413 | if (cpu_has_feature(CPU_FTR_COHERENT_ICACHE)) | |
414 | return; | |
415 | /* avoid an atomic op if possible */ | |
416 | if (test_bit(PG_arch_1, &page->flags)) | |
417 | clear_bit(PG_arch_1, &page->flags); | |
418 | } | |
419 | EXPORT_SYMBOL(flush_dcache_page); | |
420 | ||
421 | void flush_dcache_icache_page(struct page *page) | |
422 | { | |
423 | #ifdef CONFIG_BOOKE | |
424 | void *start = kmap_atomic(page, KM_PPC_SYNC_ICACHE); | |
425 | __flush_dcache_icache(start); | |
426 | kunmap_atomic(start, KM_PPC_SYNC_ICACHE); | |
ab1f9dac | 427 | #elif defined(CONFIG_8xx) || defined(CONFIG_PPC64) |
14cf11af PM |
428 | /* On 8xx there is no need to kmap since highmem is not supported */ |
429 | __flush_dcache_icache(page_address(page)); | |
430 | #else | |
431 | __flush_dcache_icache_phys(page_to_pfn(page) << PAGE_SHIFT); | |
432 | #endif | |
433 | ||
434 | } | |
435 | void clear_user_page(void *page, unsigned long vaddr, struct page *pg) | |
436 | { | |
437 | clear_page(page); | |
438 | ||
439 | if (cpu_has_feature(CPU_FTR_COHERENT_ICACHE)) | |
440 | return; | |
441 | /* | |
442 | * We shouldnt have to do this, but some versions of glibc | |
443 | * require it (ld.so assumes zero filled pages are icache clean) | |
444 | * - Anton | |
445 | */ | |
446 | ||
447 | /* avoid an atomic op if possible */ | |
448 | if (test_bit(PG_arch_1, &pg->flags)) | |
449 | clear_bit(PG_arch_1, &pg->flags); | |
450 | } | |
451 | EXPORT_SYMBOL(clear_user_page); | |
452 | ||
453 | void copy_user_page(void *vto, void *vfrom, unsigned long vaddr, | |
454 | struct page *pg) | |
455 | { | |
456 | copy_page(vto, vfrom); | |
457 | ||
458 | /* | |
459 | * We should be able to use the following optimisation, however | |
460 | * there are two problems. | |
461 | * Firstly a bug in some versions of binutils meant PLT sections | |
462 | * were not marked executable. | |
463 | * Secondly the first word in the GOT section is blrl, used | |
464 | * to establish the GOT address. Until recently the GOT was | |
465 | * not marked executable. | |
466 | * - Anton | |
467 | */ | |
468 | #if 0 | |
469 | if (!vma->vm_file && ((vma->vm_flags & VM_EXEC) == 0)) | |
470 | return; | |
471 | #endif | |
472 | ||
473 | if (cpu_has_feature(CPU_FTR_COHERENT_ICACHE)) | |
474 | return; | |
475 | ||
476 | /* avoid an atomic op if possible */ | |
477 | if (test_bit(PG_arch_1, &pg->flags)) | |
478 | clear_bit(PG_arch_1, &pg->flags); | |
479 | } | |
480 | ||
481 | void flush_icache_user_range(struct vm_area_struct *vma, struct page *page, | |
482 | unsigned long addr, int len) | |
483 | { | |
484 | unsigned long maddr; | |
485 | ||
486 | maddr = (unsigned long) kmap(page) + (addr & ~PAGE_MASK); | |
487 | flush_icache_range(maddr, maddr + len); | |
488 | kunmap(page); | |
489 | } | |
490 | EXPORT_SYMBOL(flush_icache_user_range); | |
491 | ||
492 | /* | |
493 | * This is called at the end of handling a user page fault, when the | |
494 | * fault has been handled by updating a PTE in the linux page tables. | |
495 | * We use it to preload an HPTE into the hash table corresponding to | |
496 | * the updated linux PTE. | |
497 | * | |
01edcd89 | 498 | * This must always be called with the pte lock held. |
14cf11af PM |
499 | */ |
500 | void update_mmu_cache(struct vm_area_struct *vma, unsigned long address, | |
501 | pte_t pte) | |
502 | { | |
3c726f8d BH |
503 | #ifdef CONFIG_PPC_STD_MMU |
504 | unsigned long access = 0, trap; | |
14cf11af | 505 | #endif |
3c726f8d | 506 | unsigned long pfn = pte_pfn(pte); |
14cf11af PM |
507 | |
508 | /* handle i-cache coherency */ | |
509 | if (!cpu_has_feature(CPU_FTR_COHERENT_ICACHE) && | |
510 | !cpu_has_feature(CPU_FTR_NOEXECUTE) && | |
511 | pfn_valid(pfn)) { | |
512 | struct page *page = pfn_to_page(pfn); | |
513 | if (!PageReserved(page) | |
514 | && !test_bit(PG_arch_1, &page->flags)) { | |
515 | if (vma->vm_mm == current->active_mm) { | |
516 | #ifdef CONFIG_8xx | |
517 | /* On 8xx, cache control instructions (particularly | |
518 | * "dcbst" from flush_dcache_icache) fault as write | |
519 | * operation if there is an unpopulated TLB entry | |
520 | * for the address in question. To workaround that, | |
521 | * we invalidate the TLB here, thus avoiding dcbst | |
522 | * misbehaviour. | |
523 | */ | |
524 | _tlbie(address); | |
525 | #endif | |
526 | __flush_dcache_icache((void *) address); | |
527 | } else | |
528 | flush_dcache_icache_page(page); | |
529 | set_bit(PG_arch_1, &page->flags); | |
530 | } | |
531 | } | |
532 | ||
533 | #ifdef CONFIG_PPC_STD_MMU | |
534 | /* We only want HPTEs for linux PTEs that have _PAGE_ACCESSED set */ | |
535 | if (!pte_young(pte) || address >= TASK_SIZE) | |
536 | return; | |
14cf11af | 537 | |
3c726f8d BH |
538 | /* We try to figure out if we are coming from an instruction |
539 | * access fault and pass that down to __hash_page so we avoid | |
540 | * double-faulting on execution of fresh text. We have to test | |
541 | * for regs NULL since init will get here first thing at boot | |
542 | * | |
543 | * We also avoid filling the hash if not coming from a fault | |
544 | */ | |
545 | if (current->thread.regs == NULL) | |
14cf11af | 546 | return; |
3c726f8d BH |
547 | trap = TRAP(current->thread.regs); |
548 | if (trap == 0x400) | |
549 | access |= _PAGE_EXEC; | |
550 | else if (trap != 0x300) | |
551 | return; | |
552 | hash_preload(vma->vm_mm, address, access, trap); | |
553 | #endif /* CONFIG_PPC_STD_MMU */ | |
14cf11af | 554 | } |