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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> |
d9b2b2a2 | 34 | #include <linux/lmb.h> |
14cf11af PM |
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> | |
7c8c6b97 | 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 | ||
fa90f70a | 114 | int 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 */ | |
a99824f3 BP |
148 | |
149 | /* | |
150 | * walk_memory_resource() needs to make sure there is no holes in a given | |
151 | * memory range. On PPC64, since this range comes from /sysfs, the range | |
152 | * is guaranteed to be valid, non-overlapping and can not contain any | |
153 | * holes. By the time we get here (memory add or remove), /proc/device-tree | |
154 | * is updated and correct. Only reason we need to check against device-tree | |
155 | * would be if we allow user-land to specify a memory range through a | |
156 | * system call/ioctl etc. instead of doing offline/online through /sysfs. | |
157 | */ | |
158 | int | |
159 | walk_memory_resource(unsigned long start_pfn, unsigned long nr_pages, void *arg, | |
160 | int (*func)(unsigned long, unsigned long, void *)) | |
161 | { | |
162 | return (*func)(start_pfn, nr_pages, arg); | |
163 | } | |
164 | ||
23fd0775 PM |
165 | #endif /* CONFIG_MEMORY_HOTPLUG */ |
166 | ||
14cf11af PM |
167 | void show_mem(void) |
168 | { | |
169 | unsigned long total = 0, reserved = 0; | |
170 | unsigned long shared = 0, cached = 0; | |
171 | unsigned long highmem = 0; | |
172 | struct page *page; | |
173 | pg_data_t *pgdat; | |
174 | unsigned long i; | |
175 | ||
176 | printk("Mem-info:\n"); | |
177 | show_free_areas(); | |
ec936fc5 | 178 | for_each_online_pgdat(pgdat) { |
23fd0775 PM |
179 | unsigned long flags; |
180 | pgdat_resize_lock(pgdat, &flags); | |
14cf11af | 181 | for (i = 0; i < pgdat->node_spanned_pages; i++) { |
fb6d73d3 PM |
182 | if (!pfn_valid(pgdat->node_start_pfn + i)) |
183 | continue; | |
14cf11af PM |
184 | page = pgdat_page_nr(pgdat, i); |
185 | total++; | |
186 | if (PageHighMem(page)) | |
187 | highmem++; | |
188 | if (PageReserved(page)) | |
189 | reserved++; | |
190 | else if (PageSwapCache(page)) | |
191 | cached++; | |
192 | else if (page_count(page)) | |
193 | shared += page_count(page) - 1; | |
194 | } | |
23fd0775 | 195 | pgdat_resize_unlock(pgdat, &flags); |
14cf11af PM |
196 | } |
197 | printk("%ld pages of RAM\n", total); | |
198 | #ifdef CONFIG_HIGHMEM | |
199 | printk("%ld pages of HIGHMEM\n", highmem); | |
200 | #endif | |
201 | printk("%ld reserved pages\n", reserved); | |
202 | printk("%ld pages shared\n", shared); | |
203 | printk("%ld pages swap cached\n", cached); | |
204 | } | |
205 | ||
7c8c6b97 PM |
206 | /* |
207 | * Initialize the bootmem system and give it all the memory we | |
208 | * have available. If we are using highmem, we only put the | |
209 | * lowmem into the bootmem system. | |
210 | */ | |
211 | #ifndef CONFIG_NEED_MULTIPLE_NODES | |
212 | void __init do_init_bootmem(void) | |
213 | { | |
214 | unsigned long i; | |
215 | unsigned long start, bootmap_pages; | |
216 | unsigned long total_pages; | |
217 | int boot_mapsize; | |
218 | ||
d7917ba7 KG |
219 | max_pfn = lmb_end_of_DRAM() >> PAGE_SHIFT; |
220 | total_pages = (lmb_end_of_DRAM() - memstart_addr) >> PAGE_SHIFT; | |
7c8c6b97 PM |
221 | #ifdef CONFIG_HIGHMEM |
222 | total_pages = total_lowmem >> PAGE_SHIFT; | |
d7917ba7 | 223 | max_low_pfn = lowmem_end_addr >> PAGE_SHIFT; |
7c8c6b97 PM |
224 | #endif |
225 | ||
226 | /* | |
227 | * Find an area to use for the bootmem bitmap. Calculate the size of | |
228 | * bitmap required as (Total Memory) / PAGE_SIZE / BITS_PER_BYTE. | |
229 | * Add 1 additional page in case the address isn't page-aligned. | |
230 | */ | |
231 | bootmap_pages = bootmem_bootmap_pages(total_pages); | |
232 | ||
233 | start = lmb_alloc(bootmap_pages << PAGE_SHIFT, PAGE_SIZE); | |
7c8c6b97 PM |
234 | |
235 | boot_mapsize = init_bootmem(start >> PAGE_SHIFT, total_pages); | |
236 | ||
c67c3cb4 MG |
237 | /* Add active regions with valid PFNs */ |
238 | for (i = 0; i < lmb.memory.cnt; i++) { | |
239 | unsigned long start_pfn, end_pfn; | |
240 | start_pfn = lmb.memory.region[i].base >> PAGE_SHIFT; | |
241 | end_pfn = start_pfn + lmb_size_pages(&lmb.memory, i); | |
242 | add_active_range(0, start_pfn, end_pfn); | |
243 | } | |
244 | ||
7c8c6b97 PM |
245 | /* Add all physical memory to the bootmem map, mark each area |
246 | * present. | |
247 | */ | |
7c8c6b97 | 248 | #ifdef CONFIG_HIGHMEM |
d7917ba7 | 249 | free_bootmem_with_active_regions(0, lowmem_end_addr >> PAGE_SHIFT); |
f98eeb4e KG |
250 | |
251 | /* reserve the sections we're already using */ | |
252 | for (i = 0; i < lmb.reserved.cnt; i++) { | |
253 | unsigned long addr = lmb.reserved.region[i].base + | |
254 | lmb_size_bytes(&lmb.reserved, i) - 1; | |
d7917ba7 | 255 | if (addr < lowmem_end_addr) |
f98eeb4e | 256 | reserve_bootmem(lmb.reserved.region[i].base, |
72a7fe39 BW |
257 | lmb_size_bytes(&lmb.reserved, i), |
258 | BOOTMEM_DEFAULT); | |
d7917ba7 KG |
259 | else if (lmb.reserved.region[i].base < lowmem_end_addr) { |
260 | unsigned long adjusted_size = lowmem_end_addr - | |
f98eeb4e KG |
261 | lmb.reserved.region[i].base; |
262 | reserve_bootmem(lmb.reserved.region[i].base, | |
72a7fe39 | 263 | adjusted_size, BOOTMEM_DEFAULT); |
f98eeb4e KG |
264 | } |
265 | } | |
c67c3cb4 MG |
266 | #else |
267 | free_bootmem_with_active_regions(0, max_pfn); | |
7c8c6b97 PM |
268 | |
269 | /* reserve the sections we're already using */ | |
270 | for (i = 0; i < lmb.reserved.cnt; i++) | |
271 | reserve_bootmem(lmb.reserved.region[i].base, | |
72a7fe39 BW |
272 | lmb_size_bytes(&lmb.reserved, i), |
273 | BOOTMEM_DEFAULT); | |
7c8c6b97 | 274 | |
f98eeb4e | 275 | #endif |
7c8c6b97 | 276 | /* XXX need to clip this if using highmem? */ |
c67c3cb4 MG |
277 | sparse_memory_present_with_active_regions(0); |
278 | ||
7c8c6b97 PM |
279 | init_bootmem_done = 1; |
280 | } | |
281 | ||
4e8ad3e8 JB |
282 | /* mark pages that don't exist as nosave */ |
283 | static int __init mark_nonram_nosave(void) | |
284 | { | |
285 | unsigned long lmb_next_region_start_pfn, | |
286 | lmb_region_max_pfn; | |
287 | int i; | |
288 | ||
289 | for (i = 0; i < lmb.memory.cnt - 1; i++) { | |
290 | lmb_region_max_pfn = | |
291 | (lmb.memory.region[i].base >> PAGE_SHIFT) + | |
292 | (lmb.memory.region[i].size >> PAGE_SHIFT); | |
293 | lmb_next_region_start_pfn = | |
294 | lmb.memory.region[i+1].base >> PAGE_SHIFT; | |
295 | ||
296 | if (lmb_region_max_pfn < lmb_next_region_start_pfn) | |
297 | register_nosave_region(lmb_region_max_pfn, | |
298 | lmb_next_region_start_pfn); | |
299 | } | |
300 | ||
301 | return 0; | |
302 | } | |
303 | ||
7c8c6b97 PM |
304 | /* |
305 | * paging_init() sets up the page tables - in fact we've already done this. | |
306 | */ | |
307 | void __init paging_init(void) | |
308 | { | |
7c8c6b97 PM |
309 | unsigned long total_ram = lmb_phys_mem_size(); |
310 | unsigned long top_of_ram = lmb_end_of_DRAM(); | |
c67c3cb4 | 311 | unsigned long max_zone_pfns[MAX_NR_ZONES]; |
7c8c6b97 PM |
312 | |
313 | #ifdef CONFIG_HIGHMEM | |
314 | map_page(PKMAP_BASE, 0, 0); /* XXX gross */ | |
5453e772 BH |
315 | pkmap_page_table = pte_offset_kernel(pmd_offset(pud_offset(pgd_offset_k |
316 | (PKMAP_BASE), PKMAP_BASE), PKMAP_BASE), PKMAP_BASE); | |
7c8c6b97 | 317 | map_page(KMAP_FIX_BEGIN, 0, 0); /* XXX gross */ |
5453e772 BH |
318 | kmap_pte = pte_offset_kernel(pmd_offset(pud_offset(pgd_offset_k |
319 | (KMAP_FIX_BEGIN), KMAP_FIX_BEGIN), KMAP_FIX_BEGIN), | |
320 | KMAP_FIX_BEGIN); | |
7c8c6b97 PM |
321 | kmap_prot = PAGE_KERNEL; |
322 | #endif /* CONFIG_HIGHMEM */ | |
323 | ||
e110b281 | 324 | printk(KERN_DEBUG "Top of RAM: 0x%lx, Total RAM: 0x%lx\n", |
7c8c6b97 | 325 | top_of_ram, total_ram); |
e110b281 | 326 | printk(KERN_DEBUG "Memory hole size: %ldMB\n", |
7c8c6b97 | 327 | (top_of_ram - total_ram) >> 20); |
6391af17 | 328 | memset(max_zone_pfns, 0, sizeof(max_zone_pfns)); |
7c8c6b97 | 329 | #ifdef CONFIG_HIGHMEM |
d7917ba7 | 330 | max_zone_pfns[ZONE_DMA] = lowmem_end_addr >> PAGE_SHIFT; |
6391af17 | 331 | max_zone_pfns[ZONE_HIGHMEM] = top_of_ram >> PAGE_SHIFT; |
7c8c6b97 | 332 | #else |
6391af17 | 333 | max_zone_pfns[ZONE_DMA] = top_of_ram >> PAGE_SHIFT; |
c67c3cb4 MG |
334 | #endif |
335 | free_area_init_nodes(max_zone_pfns); | |
4e8ad3e8 JB |
336 | |
337 | mark_nonram_nosave(); | |
7c8c6b97 PM |
338 | } |
339 | #endif /* ! CONFIG_NEED_MULTIPLE_NODES */ | |
340 | ||
341 | void __init mem_init(void) | |
342 | { | |
343 | #ifdef CONFIG_NEED_MULTIPLE_NODES | |
344 | int nid; | |
345 | #endif | |
346 | pg_data_t *pgdat; | |
347 | unsigned long i; | |
348 | struct page *page; | |
349 | unsigned long reservedpages = 0, codesize, initsize, datasize, bsssize; | |
350 | ||
fb6d73d3 | 351 | num_physpages = lmb.memory.size >> PAGE_SHIFT; |
7c8c6b97 PM |
352 | high_memory = (void *) __va(max_low_pfn * PAGE_SIZE); |
353 | ||
354 | #ifdef CONFIG_NEED_MULTIPLE_NODES | |
355 | for_each_online_node(nid) { | |
356 | if (NODE_DATA(nid)->node_spanned_pages != 0) { | |
c258dd40 | 357 | printk("freeing bootmem node %d\n", nid); |
7c8c6b97 PM |
358 | totalram_pages += |
359 | free_all_bootmem_node(NODE_DATA(nid)); | |
360 | } | |
361 | } | |
362 | #else | |
fb6d73d3 | 363 | max_mapnr = max_pfn; |
7c8c6b97 PM |
364 | totalram_pages += free_all_bootmem(); |
365 | #endif | |
ec936fc5 | 366 | for_each_online_pgdat(pgdat) { |
7c8c6b97 | 367 | for (i = 0; i < pgdat->node_spanned_pages; i++) { |
fb6d73d3 PM |
368 | if (!pfn_valid(pgdat->node_start_pfn + i)) |
369 | continue; | |
7c8c6b97 PM |
370 | page = pgdat_page_nr(pgdat, i); |
371 | if (PageReserved(page)) | |
372 | reservedpages++; | |
373 | } | |
374 | } | |
375 | ||
376 | codesize = (unsigned long)&_sdata - (unsigned long)&_stext; | |
bcb35576 | 377 | datasize = (unsigned long)&_edata - (unsigned long)&_sdata; |
7c8c6b97 PM |
378 | initsize = (unsigned long)&__init_end - (unsigned long)&__init_begin; |
379 | bsssize = (unsigned long)&__bss_stop - (unsigned long)&__bss_start; | |
380 | ||
381 | #ifdef CONFIG_HIGHMEM | |
382 | { | |
383 | unsigned long pfn, highmem_mapnr; | |
384 | ||
d7917ba7 | 385 | highmem_mapnr = lowmem_end_addr >> PAGE_SHIFT; |
7c8c6b97 PM |
386 | for (pfn = highmem_mapnr; pfn < max_mapnr; ++pfn) { |
387 | struct page *page = pfn_to_page(pfn); | |
f98eeb4e KG |
388 | if (lmb_is_reserved(pfn << PAGE_SHIFT)) |
389 | continue; | |
7c8c6b97 | 390 | ClearPageReserved(page); |
7835e98b | 391 | init_page_count(page); |
7c8c6b97 PM |
392 | __free_page(page); |
393 | totalhigh_pages++; | |
f98eeb4e | 394 | reservedpages--; |
7c8c6b97 PM |
395 | } |
396 | totalram_pages += totalhigh_pages; | |
e110b281 | 397 | printk(KERN_DEBUG "High memory: %luk\n", |
7c8c6b97 PM |
398 | totalhigh_pages << (PAGE_SHIFT-10)); |
399 | } | |
400 | #endif /* CONFIG_HIGHMEM */ | |
401 | ||
402 | printk(KERN_INFO "Memory: %luk/%luk available (%luk kernel code, " | |
403 | "%luk reserved, %luk data, %luk bss, %luk init)\n", | |
404 | (unsigned long)nr_free_pages() << (PAGE_SHIFT-10), | |
405 | num_physpages << (PAGE_SHIFT-10), | |
406 | codesize >> 10, | |
407 | reservedpages << (PAGE_SHIFT-10), | |
408 | datasize >> 10, | |
409 | bsssize >> 10, | |
410 | initsize >> 10); | |
411 | ||
412 | mem_init_done = 1; | |
7c8c6b97 PM |
413 | } |
414 | ||
14cf11af PM |
415 | /* |
416 | * This is called when a page has been modified by the kernel. | |
417 | * It just marks the page as not i-cache clean. We do the i-cache | |
418 | * flush later when the page is given to a user process, if necessary. | |
419 | */ | |
420 | void flush_dcache_page(struct page *page) | |
421 | { | |
422 | if (cpu_has_feature(CPU_FTR_COHERENT_ICACHE)) | |
423 | return; | |
424 | /* avoid an atomic op if possible */ | |
425 | if (test_bit(PG_arch_1, &page->flags)) | |
426 | clear_bit(PG_arch_1, &page->flags); | |
427 | } | |
428 | EXPORT_SYMBOL(flush_dcache_page); | |
429 | ||
430 | void flush_dcache_icache_page(struct page *page) | |
431 | { | |
432 | #ifdef CONFIG_BOOKE | |
433 | void *start = kmap_atomic(page, KM_PPC_SYNC_ICACHE); | |
434 | __flush_dcache_icache(start); | |
435 | kunmap_atomic(start, KM_PPC_SYNC_ICACHE); | |
ab1f9dac | 436 | #elif defined(CONFIG_8xx) || defined(CONFIG_PPC64) |
14cf11af PM |
437 | /* On 8xx there is no need to kmap since highmem is not supported */ |
438 | __flush_dcache_icache(page_address(page)); | |
439 | #else | |
440 | __flush_dcache_icache_phys(page_to_pfn(page) << PAGE_SHIFT); | |
441 | #endif | |
442 | ||
443 | } | |
444 | void clear_user_page(void *page, unsigned long vaddr, struct page *pg) | |
445 | { | |
446 | clear_page(page); | |
447 | ||
14cf11af PM |
448 | /* |
449 | * We shouldnt have to do this, but some versions of glibc | |
450 | * require it (ld.so assumes zero filled pages are icache clean) | |
451 | * - Anton | |
452 | */ | |
09f5dc44 | 453 | flush_dcache_page(pg); |
14cf11af PM |
454 | } |
455 | EXPORT_SYMBOL(clear_user_page); | |
456 | ||
457 | void copy_user_page(void *vto, void *vfrom, unsigned long vaddr, | |
458 | struct page *pg) | |
459 | { | |
460 | copy_page(vto, vfrom); | |
461 | ||
462 | /* | |
463 | * We should be able to use the following optimisation, however | |
464 | * there are two problems. | |
465 | * Firstly a bug in some versions of binutils meant PLT sections | |
466 | * were not marked executable. | |
467 | * Secondly the first word in the GOT section is blrl, used | |
468 | * to establish the GOT address. Until recently the GOT was | |
469 | * not marked executable. | |
470 | * - Anton | |
471 | */ | |
472 | #if 0 | |
473 | if (!vma->vm_file && ((vma->vm_flags & VM_EXEC) == 0)) | |
474 | return; | |
475 | #endif | |
476 | ||
09f5dc44 | 477 | flush_dcache_page(pg); |
14cf11af PM |
478 | } |
479 | ||
480 | void flush_icache_user_range(struct vm_area_struct *vma, struct page *page, | |
481 | unsigned long addr, int len) | |
482 | { | |
483 | unsigned long maddr; | |
484 | ||
485 | maddr = (unsigned long) kmap(page) + (addr & ~PAGE_MASK); | |
486 | flush_icache_range(maddr, maddr + len); | |
487 | kunmap(page); | |
488 | } | |
489 | EXPORT_SYMBOL(flush_icache_user_range); | |
490 | ||
491 | /* | |
492 | * This is called at the end of handling a user page fault, when the | |
493 | * fault has been handled by updating a PTE in the linux page tables. | |
494 | * We use it to preload an HPTE into the hash table corresponding to | |
495 | * the updated linux PTE. | |
496 | * | |
01edcd89 | 497 | * This must always be called with the pte lock held. |
14cf11af PM |
498 | */ |
499 | void update_mmu_cache(struct vm_area_struct *vma, unsigned long address, | |
500 | pte_t pte) | |
501 | { | |
3c726f8d BH |
502 | #ifdef CONFIG_PPC_STD_MMU |
503 | unsigned long access = 0, trap; | |
14cf11af | 504 | #endif |
3c726f8d | 505 | unsigned long pfn = pte_pfn(pte); |
14cf11af PM |
506 | |
507 | /* handle i-cache coherency */ | |
508 | if (!cpu_has_feature(CPU_FTR_COHERENT_ICACHE) && | |
509 | !cpu_has_feature(CPU_FTR_NOEXECUTE) && | |
510 | pfn_valid(pfn)) { | |
511 | struct page *page = pfn_to_page(pfn); | |
dbbb06b7 VB |
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 | */ | |
0b47759d | 520 | _tlbie(address, 0 /* 8xx doesn't care about PID */); |
dbbb06b7 | 521 | #endif |
551ed332 SW |
522 | /* The _PAGE_USER test should really be _PAGE_EXEC, but |
523 | * older glibc versions execute some code from no-exec | |
524 | * pages, which for now we are supporting. If exec-only | |
525 | * pages are ever implemented, this will have to change. | |
526 | */ | |
527 | if (!PageReserved(page) && (pte_val(pte) & _PAGE_USER) | |
14cf11af PM |
528 | && !test_bit(PG_arch_1, &page->flags)) { |
529 | if (vma->vm_mm == current->active_mm) { | |
14cf11af PM |
530 | __flush_dcache_icache((void *) address); |
531 | } else | |
532 | flush_dcache_icache_page(page); | |
533 | set_bit(PG_arch_1, &page->flags); | |
534 | } | |
535 | } | |
536 | ||
537 | #ifdef CONFIG_PPC_STD_MMU | |
538 | /* We only want HPTEs for linux PTEs that have _PAGE_ACCESSED set */ | |
539 | if (!pte_young(pte) || address >= TASK_SIZE) | |
540 | return; | |
14cf11af | 541 | |
3c726f8d BH |
542 | /* We try to figure out if we are coming from an instruction |
543 | * access fault and pass that down to __hash_page so we avoid | |
544 | * double-faulting on execution of fresh text. We have to test | |
545 | * for regs NULL since init will get here first thing at boot | |
546 | * | |
547 | * We also avoid filling the hash if not coming from a fault | |
548 | */ | |
549 | if (current->thread.regs == NULL) | |
14cf11af | 550 | return; |
3c726f8d BH |
551 | trap = TRAP(current->thread.regs); |
552 | if (trap == 0x400) | |
553 | access |= _PAGE_EXEC; | |
554 | else if (trap != 0x300) | |
555 | return; | |
556 | hash_preload(vma->vm_mm, address, access, trap); | |
557 | #endif /* CONFIG_PPC_STD_MMU */ | |
14cf11af | 558 | } |