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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> |
2c419bde | 48 | #include <asm/fixmap.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 | |
2c419bde KG |
61 | #ifdef CONFIG_HIGHMEM |
62 | pte_t *kmap_pte; | |
63 | pgprot_t kmap_prot; | |
64 | ||
65 | EXPORT_SYMBOL(kmap_prot); | |
66 | EXPORT_SYMBOL(kmap_pte); | |
67 | ||
68 | static inline pte_t *virt_to_kpte(unsigned long vaddr) | |
69 | { | |
70 | return pte_offset_kernel(pmd_offset(pud_offset(pgd_offset_k(vaddr), | |
71 | vaddr), vaddr), vaddr); | |
72 | } | |
73 | #endif | |
74 | ||
14cf11af PM |
75 | int page_is_ram(unsigned long pfn) |
76 | { | |
77 | unsigned long paddr = (pfn << PAGE_SHIFT); | |
78 | ||
79 | #ifndef CONFIG_PPC64 /* XXX for now */ | |
80 | return paddr < __pa(high_memory); | |
81 | #else | |
82 | int i; | |
83 | for (i=0; i < lmb.memory.cnt; i++) { | |
84 | unsigned long base; | |
85 | ||
86 | base = lmb.memory.region[i].base; | |
87 | ||
88 | if ((paddr >= base) && | |
89 | (paddr < (base + lmb.memory.region[i].size))) { | |
90 | return 1; | |
91 | } | |
92 | } | |
93 | ||
94 | return 0; | |
95 | #endif | |
96 | } | |
14cf11af | 97 | |
8b150478 | 98 | pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn, |
14cf11af PM |
99 | unsigned long size, pgprot_t vma_prot) |
100 | { | |
101 | if (ppc_md.phys_mem_access_prot) | |
8b150478 | 102 | return ppc_md.phys_mem_access_prot(file, pfn, size, vma_prot); |
14cf11af | 103 | |
8b150478 | 104 | if (!page_is_ram(pfn)) |
14cf11af PM |
105 | vma_prot = __pgprot(pgprot_val(vma_prot) |
106 | | _PAGE_GUARDED | _PAGE_NO_CACHE); | |
107 | return vma_prot; | |
108 | } | |
109 | EXPORT_SYMBOL(phys_mem_access_prot); | |
110 | ||
23fd0775 PM |
111 | #ifdef CONFIG_MEMORY_HOTPLUG |
112 | ||
bc02af93 YG |
113 | #ifdef CONFIG_NUMA |
114 | int memory_add_physaddr_to_nid(u64 start) | |
115 | { | |
116 | return hot_add_scn_to_nid(start); | |
117 | } | |
118 | #endif | |
119 | ||
fa90f70a | 120 | int arch_add_memory(int nid, u64 start, u64 size) |
23fd0775 | 121 | { |
237a0989 | 122 | struct pglist_data *pgdata; |
23fd0775 PM |
123 | struct zone *zone; |
124 | unsigned long start_pfn = start >> PAGE_SHIFT; | |
125 | unsigned long nr_pages = size >> PAGE_SHIFT; | |
126 | ||
237a0989 MK |
127 | pgdata = NODE_DATA(nid); |
128 | ||
2d0eee14 | 129 | start = (unsigned long)__va(start); |
54b79248 MK |
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); | |
23fd0775 PM |
136 | } |
137 | ||
aa620abe BP |
138 | #ifdef CONFIG_MEMORY_HOTREMOVE |
139 | int remove_memory(u64 start, u64 size) | |
140 | { | |
141 | unsigned long start_pfn, end_pfn; | |
142 | int ret; | |
143 | ||
144 | start_pfn = start >> PAGE_SHIFT; | |
145 | end_pfn = start_pfn + (size >> PAGE_SHIFT); | |
146 | ret = offline_pages(start_pfn, end_pfn, 120 * HZ); | |
147 | if (ret) | |
148 | goto out; | |
149 | /* Arch-specific calls go here - next patch */ | |
150 | out: | |
151 | return ret; | |
152 | } | |
153 | #endif /* CONFIG_MEMORY_HOTREMOVE */ | |
0d579944 | 154 | #endif /* CONFIG_MEMORY_HOTPLUG */ |
a99824f3 BP |
155 | |
156 | /* | |
157 | * walk_memory_resource() needs to make sure there is no holes in a given | |
9d88a2eb BP |
158 | * memory range. PPC64 does not maintain the memory layout in /proc/iomem. |
159 | * Instead it maintains it in lmb.memory structures. Walk through the | |
160 | * memory regions, find holes and callback for contiguous regions. | |
a99824f3 BP |
161 | */ |
162 | int | |
163 | walk_memory_resource(unsigned long start_pfn, unsigned long nr_pages, void *arg, | |
164 | int (*func)(unsigned long, unsigned long, void *)) | |
165 | { | |
9d88a2eb BP |
166 | struct lmb_property res; |
167 | unsigned long pfn, len; | |
168 | u64 end; | |
169 | int ret = -1; | |
170 | ||
171 | res.base = (u64) start_pfn << PAGE_SHIFT; | |
172 | res.size = (u64) nr_pages << PAGE_SHIFT; | |
173 | ||
174 | end = res.base + res.size - 1; | |
175 | while ((res.base < end) && (lmb_find(&res) >= 0)) { | |
176 | pfn = (unsigned long)(res.base >> PAGE_SHIFT); | |
177 | len = (unsigned long)(res.size >> PAGE_SHIFT); | |
178 | ret = (*func)(pfn, len, arg); | |
179 | if (ret) | |
180 | break; | |
181 | res.base += (res.size + 1); | |
182 | res.size = (end - res.base + 1); | |
183 | } | |
184 | return ret; | |
a99824f3 | 185 | } |
9d88a2eb | 186 | EXPORT_SYMBOL_GPL(walk_memory_resource); |
a99824f3 | 187 | |
14cf11af PM |
188 | void show_mem(void) |
189 | { | |
190 | unsigned long total = 0, reserved = 0; | |
191 | unsigned long shared = 0, cached = 0; | |
192 | unsigned long highmem = 0; | |
193 | struct page *page; | |
194 | pg_data_t *pgdat; | |
195 | unsigned long i; | |
196 | ||
197 | printk("Mem-info:\n"); | |
198 | show_free_areas(); | |
ec936fc5 | 199 | for_each_online_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 | ||
37dd2bad | 240 | max_low_pfn = max_pfn = lmb_end_of_DRAM() >> PAGE_SHIFT; |
d7917ba7 | 241 | total_pages = (lmb_end_of_DRAM() - memstart_addr) >> PAGE_SHIFT; |
7c8c6b97 PM |
242 | #ifdef CONFIG_HIGHMEM |
243 | total_pages = total_lowmem >> PAGE_SHIFT; | |
d7917ba7 | 244 | max_low_pfn = lowmem_end_addr >> PAGE_SHIFT; |
7c8c6b97 PM |
245 | #endif |
246 | ||
247 | /* | |
248 | * Find an area to use for the bootmem bitmap. Calculate the size of | |
249 | * bitmap required as (Total Memory) / PAGE_SIZE / BITS_PER_BYTE. | |
250 | * Add 1 additional page in case the address isn't page-aligned. | |
251 | */ | |
252 | bootmap_pages = bootmem_bootmap_pages(total_pages); | |
253 | ||
254 | start = lmb_alloc(bootmap_pages << PAGE_SHIFT, PAGE_SIZE); | |
7c8c6b97 | 255 | |
37dd2bad KG |
256 | min_low_pfn = MEMORY_START >> PAGE_SHIFT; |
257 | boot_mapsize = init_bootmem_node(NODE_DATA(0), start >> PAGE_SHIFT, min_low_pfn, max_low_pfn); | |
7c8c6b97 | 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 |
d7917ba7 | 271 | free_bootmem_with_active_regions(0, lowmem_end_addr >> PAGE_SHIFT); |
f98eeb4e KG |
272 | |
273 | /* reserve the sections we're already using */ | |
274 | for (i = 0; i < lmb.reserved.cnt; i++) { | |
275 | unsigned long addr = lmb.reserved.region[i].base + | |
276 | lmb_size_bytes(&lmb.reserved, i) - 1; | |
d7917ba7 | 277 | if (addr < lowmem_end_addr) |
f98eeb4e | 278 | reserve_bootmem(lmb.reserved.region[i].base, |
72a7fe39 BW |
279 | lmb_size_bytes(&lmb.reserved, i), |
280 | BOOTMEM_DEFAULT); | |
d7917ba7 KG |
281 | else if (lmb.reserved.region[i].base < lowmem_end_addr) { |
282 | unsigned long adjusted_size = lowmem_end_addr - | |
f98eeb4e KG |
283 | lmb.reserved.region[i].base; |
284 | reserve_bootmem(lmb.reserved.region[i].base, | |
72a7fe39 | 285 | adjusted_size, BOOTMEM_DEFAULT); |
f98eeb4e KG |
286 | } |
287 | } | |
c67c3cb4 MG |
288 | #else |
289 | free_bootmem_with_active_regions(0, max_pfn); | |
7c8c6b97 PM |
290 | |
291 | /* reserve the sections we're already using */ | |
292 | for (i = 0; i < lmb.reserved.cnt; i++) | |
293 | reserve_bootmem(lmb.reserved.region[i].base, | |
72a7fe39 BW |
294 | lmb_size_bytes(&lmb.reserved, i), |
295 | BOOTMEM_DEFAULT); | |
7c8c6b97 | 296 | |
f98eeb4e | 297 | #endif |
7c8c6b97 | 298 | /* XXX need to clip this if using highmem? */ |
c67c3cb4 MG |
299 | sparse_memory_present_with_active_regions(0); |
300 | ||
7c8c6b97 PM |
301 | init_bootmem_done = 1; |
302 | } | |
303 | ||
4e8ad3e8 JB |
304 | /* mark pages that don't exist as nosave */ |
305 | static int __init mark_nonram_nosave(void) | |
306 | { | |
307 | unsigned long lmb_next_region_start_pfn, | |
308 | lmb_region_max_pfn; | |
309 | int i; | |
310 | ||
311 | for (i = 0; i < lmb.memory.cnt - 1; i++) { | |
312 | lmb_region_max_pfn = | |
313 | (lmb.memory.region[i].base >> PAGE_SHIFT) + | |
314 | (lmb.memory.region[i].size >> PAGE_SHIFT); | |
315 | lmb_next_region_start_pfn = | |
316 | lmb.memory.region[i+1].base >> PAGE_SHIFT; | |
317 | ||
318 | if (lmb_region_max_pfn < lmb_next_region_start_pfn) | |
319 | register_nosave_region(lmb_region_max_pfn, | |
320 | lmb_next_region_start_pfn); | |
321 | } | |
322 | ||
323 | return 0; | |
324 | } | |
325 | ||
7c8c6b97 PM |
326 | /* |
327 | * paging_init() sets up the page tables - in fact we've already done this. | |
328 | */ | |
329 | void __init paging_init(void) | |
330 | { | |
7c8c6b97 PM |
331 | unsigned long total_ram = lmb_phys_mem_size(); |
332 | unsigned long top_of_ram = lmb_end_of_DRAM(); | |
c67c3cb4 | 333 | unsigned long max_zone_pfns[MAX_NR_ZONES]; |
7c8c6b97 | 334 | |
2c419bde KG |
335 | #ifdef CONFIG_PPC32 |
336 | unsigned long v = __fix_to_virt(__end_of_fixed_addresses - 1); | |
337 | unsigned long end = __fix_to_virt(FIX_HOLE); | |
338 | ||
339 | for (; v < end; v += PAGE_SIZE) | |
340 | map_page(v, 0, 0); /* XXX gross */ | |
341 | #endif | |
342 | ||
7c8c6b97 PM |
343 | #ifdef CONFIG_HIGHMEM |
344 | map_page(PKMAP_BASE, 0, 0); /* XXX gross */ | |
2c419bde KG |
345 | pkmap_page_table = virt_to_kpte(PKMAP_BASE); |
346 | ||
347 | kmap_pte = virt_to_kpte(__fix_to_virt(FIX_KMAP_BEGIN)); | |
7c8c6b97 PM |
348 | kmap_prot = PAGE_KERNEL; |
349 | #endif /* CONFIG_HIGHMEM */ | |
350 | ||
e110b281 | 351 | printk(KERN_DEBUG "Top of RAM: 0x%lx, Total RAM: 0x%lx\n", |
7c8c6b97 | 352 | top_of_ram, total_ram); |
e110b281 | 353 | printk(KERN_DEBUG "Memory hole size: %ldMB\n", |
7c8c6b97 | 354 | (top_of_ram - total_ram) >> 20); |
6391af17 | 355 | memset(max_zone_pfns, 0, sizeof(max_zone_pfns)); |
7c8c6b97 | 356 | #ifdef CONFIG_HIGHMEM |
d7917ba7 | 357 | max_zone_pfns[ZONE_DMA] = lowmem_end_addr >> PAGE_SHIFT; |
6391af17 | 358 | max_zone_pfns[ZONE_HIGHMEM] = top_of_ram >> PAGE_SHIFT; |
7c8c6b97 | 359 | #else |
6391af17 | 360 | max_zone_pfns[ZONE_DMA] = top_of_ram >> PAGE_SHIFT; |
c67c3cb4 MG |
361 | #endif |
362 | free_area_init_nodes(max_zone_pfns); | |
4e8ad3e8 JB |
363 | |
364 | mark_nonram_nosave(); | |
7c8c6b97 PM |
365 | } |
366 | #endif /* ! CONFIG_NEED_MULTIPLE_NODES */ | |
367 | ||
368 | void __init mem_init(void) | |
369 | { | |
370 | #ifdef CONFIG_NEED_MULTIPLE_NODES | |
371 | int nid; | |
372 | #endif | |
373 | pg_data_t *pgdat; | |
374 | unsigned long i; | |
375 | struct page *page; | |
376 | unsigned long reservedpages = 0, codesize, initsize, datasize, bsssize; | |
377 | ||
fb6d73d3 | 378 | num_physpages = lmb.memory.size >> PAGE_SHIFT; |
7c8c6b97 PM |
379 | high_memory = (void *) __va(max_low_pfn * PAGE_SIZE); |
380 | ||
381 | #ifdef CONFIG_NEED_MULTIPLE_NODES | |
382 | for_each_online_node(nid) { | |
383 | if (NODE_DATA(nid)->node_spanned_pages != 0) { | |
c258dd40 | 384 | printk("freeing bootmem node %d\n", nid); |
7c8c6b97 PM |
385 | totalram_pages += |
386 | free_all_bootmem_node(NODE_DATA(nid)); | |
387 | } | |
388 | } | |
389 | #else | |
fb6d73d3 | 390 | max_mapnr = max_pfn; |
7c8c6b97 PM |
391 | totalram_pages += free_all_bootmem(); |
392 | #endif | |
ec936fc5 | 393 | for_each_online_pgdat(pgdat) { |
7c8c6b97 | 394 | for (i = 0; i < pgdat->node_spanned_pages; i++) { |
fb6d73d3 PM |
395 | if (!pfn_valid(pgdat->node_start_pfn + i)) |
396 | continue; | |
7c8c6b97 PM |
397 | page = pgdat_page_nr(pgdat, i); |
398 | if (PageReserved(page)) | |
399 | reservedpages++; | |
400 | } | |
401 | } | |
402 | ||
403 | codesize = (unsigned long)&_sdata - (unsigned long)&_stext; | |
bcb35576 | 404 | datasize = (unsigned long)&_edata - (unsigned long)&_sdata; |
7c8c6b97 PM |
405 | initsize = (unsigned long)&__init_end - (unsigned long)&__init_begin; |
406 | bsssize = (unsigned long)&__bss_stop - (unsigned long)&__bss_start; | |
407 | ||
408 | #ifdef CONFIG_HIGHMEM | |
409 | { | |
410 | unsigned long pfn, highmem_mapnr; | |
411 | ||
d7917ba7 | 412 | highmem_mapnr = lowmem_end_addr >> PAGE_SHIFT; |
7c8c6b97 PM |
413 | for (pfn = highmem_mapnr; pfn < max_mapnr; ++pfn) { |
414 | struct page *page = pfn_to_page(pfn); | |
f98eeb4e KG |
415 | if (lmb_is_reserved(pfn << PAGE_SHIFT)) |
416 | continue; | |
7c8c6b97 | 417 | ClearPageReserved(page); |
7835e98b | 418 | init_page_count(page); |
7c8c6b97 PM |
419 | __free_page(page); |
420 | totalhigh_pages++; | |
f98eeb4e | 421 | reservedpages--; |
7c8c6b97 PM |
422 | } |
423 | totalram_pages += totalhigh_pages; | |
e110b281 | 424 | printk(KERN_DEBUG "High memory: %luk\n", |
7c8c6b97 PM |
425 | totalhigh_pages << (PAGE_SHIFT-10)); |
426 | } | |
427 | #endif /* CONFIG_HIGHMEM */ | |
428 | ||
429 | printk(KERN_INFO "Memory: %luk/%luk available (%luk kernel code, " | |
430 | "%luk reserved, %luk data, %luk bss, %luk init)\n", | |
431 | (unsigned long)nr_free_pages() << (PAGE_SHIFT-10), | |
432 | num_physpages << (PAGE_SHIFT-10), | |
433 | codesize >> 10, | |
434 | reservedpages << (PAGE_SHIFT-10), | |
435 | datasize >> 10, | |
436 | bsssize >> 10, | |
437 | initsize >> 10); | |
438 | ||
439 | mem_init_done = 1; | |
7c8c6b97 PM |
440 | } |
441 | ||
14cf11af PM |
442 | /* |
443 | * This is called when a page has been modified by the kernel. | |
444 | * It just marks the page as not i-cache clean. We do the i-cache | |
445 | * flush later when the page is given to a user process, if necessary. | |
446 | */ | |
447 | void flush_dcache_page(struct page *page) | |
448 | { | |
449 | if (cpu_has_feature(CPU_FTR_COHERENT_ICACHE)) | |
450 | return; | |
451 | /* avoid an atomic op if possible */ | |
452 | if (test_bit(PG_arch_1, &page->flags)) | |
453 | clear_bit(PG_arch_1, &page->flags); | |
454 | } | |
455 | EXPORT_SYMBOL(flush_dcache_page); | |
456 | ||
457 | void flush_dcache_icache_page(struct page *page) | |
458 | { | |
459 | #ifdef CONFIG_BOOKE | |
460 | void *start = kmap_atomic(page, KM_PPC_SYNC_ICACHE); | |
461 | __flush_dcache_icache(start); | |
462 | kunmap_atomic(start, KM_PPC_SYNC_ICACHE); | |
ab1f9dac | 463 | #elif defined(CONFIG_8xx) || defined(CONFIG_PPC64) |
14cf11af PM |
464 | /* On 8xx there is no need to kmap since highmem is not supported */ |
465 | __flush_dcache_icache(page_address(page)); | |
466 | #else | |
467 | __flush_dcache_icache_phys(page_to_pfn(page) << PAGE_SHIFT); | |
468 | #endif | |
469 | ||
470 | } | |
471 | void clear_user_page(void *page, unsigned long vaddr, struct page *pg) | |
472 | { | |
473 | clear_page(page); | |
474 | ||
14cf11af PM |
475 | /* |
476 | * We shouldnt have to do this, but some versions of glibc | |
477 | * require it (ld.so assumes zero filled pages are icache clean) | |
478 | * - Anton | |
479 | */ | |
09f5dc44 | 480 | flush_dcache_page(pg); |
14cf11af PM |
481 | } |
482 | EXPORT_SYMBOL(clear_user_page); | |
483 | ||
484 | void copy_user_page(void *vto, void *vfrom, unsigned long vaddr, | |
485 | struct page *pg) | |
486 | { | |
487 | copy_page(vto, vfrom); | |
488 | ||
489 | /* | |
490 | * We should be able to use the following optimisation, however | |
491 | * there are two problems. | |
492 | * Firstly a bug in some versions of binutils meant PLT sections | |
493 | * were not marked executable. | |
494 | * Secondly the first word in the GOT section is blrl, used | |
495 | * to establish the GOT address. Until recently the GOT was | |
496 | * not marked executable. | |
497 | * - Anton | |
498 | */ | |
499 | #if 0 | |
500 | if (!vma->vm_file && ((vma->vm_flags & VM_EXEC) == 0)) | |
501 | return; | |
502 | #endif | |
503 | ||
09f5dc44 | 504 | flush_dcache_page(pg); |
14cf11af PM |
505 | } |
506 | ||
507 | void flush_icache_user_range(struct vm_area_struct *vma, struct page *page, | |
508 | unsigned long addr, int len) | |
509 | { | |
510 | unsigned long maddr; | |
511 | ||
512 | maddr = (unsigned long) kmap(page) + (addr & ~PAGE_MASK); | |
513 | flush_icache_range(maddr, maddr + len); | |
514 | kunmap(page); | |
515 | } | |
516 | EXPORT_SYMBOL(flush_icache_user_range); | |
517 | ||
518 | /* | |
519 | * This is called at the end of handling a user page fault, when the | |
520 | * fault has been handled by updating a PTE in the linux page tables. | |
521 | * We use it to preload an HPTE into the hash table corresponding to | |
522 | * the updated linux PTE. | |
523 | * | |
01edcd89 | 524 | * This must always be called with the pte lock held. |
14cf11af PM |
525 | */ |
526 | void update_mmu_cache(struct vm_area_struct *vma, unsigned long address, | |
527 | pte_t pte) | |
528 | { | |
3c726f8d BH |
529 | #ifdef CONFIG_PPC_STD_MMU |
530 | unsigned long access = 0, trap; | |
14cf11af | 531 | #endif |
3c726f8d | 532 | unsigned long pfn = pte_pfn(pte); |
14cf11af PM |
533 | |
534 | /* handle i-cache coherency */ | |
535 | if (!cpu_has_feature(CPU_FTR_COHERENT_ICACHE) && | |
536 | !cpu_has_feature(CPU_FTR_NOEXECUTE) && | |
537 | pfn_valid(pfn)) { | |
538 | struct page *page = pfn_to_page(pfn); | |
dbbb06b7 VB |
539 | #ifdef CONFIG_8xx |
540 | /* On 8xx, cache control instructions (particularly | |
541 | * "dcbst" from flush_dcache_icache) fault as write | |
542 | * operation if there is an unpopulated TLB entry | |
543 | * for the address in question. To workaround that, | |
544 | * we invalidate the TLB here, thus avoiding dcbst | |
545 | * misbehaviour. | |
546 | */ | |
0b47759d | 547 | _tlbie(address, 0 /* 8xx doesn't care about PID */); |
dbbb06b7 | 548 | #endif |
551ed332 SW |
549 | /* The _PAGE_USER test should really be _PAGE_EXEC, but |
550 | * older glibc versions execute some code from no-exec | |
551 | * pages, which for now we are supporting. If exec-only | |
552 | * pages are ever implemented, this will have to change. | |
553 | */ | |
554 | if (!PageReserved(page) && (pte_val(pte) & _PAGE_USER) | |
14cf11af PM |
555 | && !test_bit(PG_arch_1, &page->flags)) { |
556 | if (vma->vm_mm == current->active_mm) { | |
14cf11af PM |
557 | __flush_dcache_icache((void *) address); |
558 | } else | |
559 | flush_dcache_icache_page(page); | |
560 | set_bit(PG_arch_1, &page->flags); | |
561 | } | |
562 | } | |
563 | ||
564 | #ifdef CONFIG_PPC_STD_MMU | |
565 | /* We only want HPTEs for linux PTEs that have _PAGE_ACCESSED set */ | |
566 | if (!pte_young(pte) || address >= TASK_SIZE) | |
567 | return; | |
14cf11af | 568 | |
3c726f8d BH |
569 | /* We try to figure out if we are coming from an instruction |
570 | * access fault and pass that down to __hash_page so we avoid | |
571 | * double-faulting on execution of fresh text. We have to test | |
572 | * for regs NULL since init will get here first thing at boot | |
573 | * | |
574 | * We also avoid filling the hash if not coming from a fault | |
575 | */ | |
576 | if (current->thread.regs == NULL) | |
14cf11af | 577 | return; |
3c726f8d BH |
578 | trap = TRAP(current->thread.regs); |
579 | if (trap == 0x400) | |
580 | access |= _PAGE_EXEC; | |
581 | else if (trap != 0x300) | |
582 | return; | |
583 | hash_preload(vma->vm_mm, address, access, trap); | |
584 | #endif /* CONFIG_PPC_STD_MMU */ | |
14cf11af | 585 | } |