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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> |
db7f37de | 47 | #include <asm/sparsemem.h> |
ab1f9dac | 48 | #include <asm/vdso.h> |
2c419bde | 49 | #include <asm/fixmap.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 | |
2c419bde KG |
62 | #ifdef CONFIG_HIGHMEM |
63 | pte_t *kmap_pte; | |
64 | pgprot_t kmap_prot; | |
65 | ||
66 | EXPORT_SYMBOL(kmap_prot); | |
67 | EXPORT_SYMBOL(kmap_pte); | |
68 | ||
69 | static inline pte_t *virt_to_kpte(unsigned long vaddr) | |
70 | { | |
71 | return pte_offset_kernel(pmd_offset(pud_offset(pgd_offset_k(vaddr), | |
72 | vaddr), vaddr), vaddr); | |
73 | } | |
74 | #endif | |
75 | ||
14cf11af PM |
76 | int page_is_ram(unsigned long pfn) |
77 | { | |
14cf11af | 78 | #ifndef CONFIG_PPC64 /* XXX for now */ |
a880e762 | 79 | return pfn < max_pfn; |
14cf11af | 80 | #else |
a880e762 | 81 | unsigned long paddr = (pfn << PAGE_SHIFT); |
14cf11af PM |
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)) |
64b3d0e8 BH |
105 | vma_prot = pgprot_noncached(vma_prot); |
106 | ||
14cf11af PM |
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 | 136 | } |
0d579944 | 137 | #endif /* CONFIG_MEMORY_HOTPLUG */ |
a99824f3 BP |
138 | |
139 | /* | |
140 | * walk_memory_resource() needs to make sure there is no holes in a given | |
9d88a2eb BP |
141 | * memory range. PPC64 does not maintain the memory layout in /proc/iomem. |
142 | * Instead it maintains it in lmb.memory structures. Walk through the | |
143 | * memory regions, find holes and callback for contiguous regions. | |
a99824f3 BP |
144 | */ |
145 | int | |
146 | walk_memory_resource(unsigned long start_pfn, unsigned long nr_pages, void *arg, | |
147 | int (*func)(unsigned long, unsigned long, void *)) | |
148 | { | |
9d88a2eb BP |
149 | struct lmb_property res; |
150 | unsigned long pfn, len; | |
151 | u64 end; | |
152 | int ret = -1; | |
153 | ||
154 | res.base = (u64) start_pfn << PAGE_SHIFT; | |
155 | res.size = (u64) nr_pages << PAGE_SHIFT; | |
156 | ||
157 | end = res.base + res.size - 1; | |
158 | while ((res.base < end) && (lmb_find(&res) >= 0)) { | |
159 | pfn = (unsigned long)(res.base >> PAGE_SHIFT); | |
160 | len = (unsigned long)(res.size >> PAGE_SHIFT); | |
161 | ret = (*func)(pfn, len, arg); | |
162 | if (ret) | |
163 | break; | |
164 | res.base += (res.size + 1); | |
165 | res.size = (end - res.base + 1); | |
166 | } | |
167 | return ret; | |
a99824f3 | 168 | } |
9d88a2eb | 169 | EXPORT_SYMBOL_GPL(walk_memory_resource); |
a99824f3 | 170 | |
7c8c6b97 PM |
171 | /* |
172 | * Initialize the bootmem system and give it all the memory we | |
173 | * have available. If we are using highmem, we only put the | |
174 | * lowmem into the bootmem system. | |
175 | */ | |
176 | #ifndef CONFIG_NEED_MULTIPLE_NODES | |
177 | void __init do_init_bootmem(void) | |
178 | { | |
179 | unsigned long i; | |
180 | unsigned long start, bootmap_pages; | |
181 | unsigned long total_pages; | |
182 | int boot_mapsize; | |
183 | ||
37dd2bad | 184 | max_low_pfn = max_pfn = lmb_end_of_DRAM() >> PAGE_SHIFT; |
d7917ba7 | 185 | total_pages = (lmb_end_of_DRAM() - memstart_addr) >> PAGE_SHIFT; |
7c8c6b97 PM |
186 | #ifdef CONFIG_HIGHMEM |
187 | total_pages = total_lowmem >> PAGE_SHIFT; | |
d7917ba7 | 188 | max_low_pfn = lowmem_end_addr >> PAGE_SHIFT; |
7c8c6b97 PM |
189 | #endif |
190 | ||
191 | /* | |
192 | * Find an area to use for the bootmem bitmap. Calculate the size of | |
193 | * bitmap required as (Total Memory) / PAGE_SIZE / BITS_PER_BYTE. | |
194 | * Add 1 additional page in case the address isn't page-aligned. | |
195 | */ | |
196 | bootmap_pages = bootmem_bootmap_pages(total_pages); | |
197 | ||
198 | start = lmb_alloc(bootmap_pages << PAGE_SHIFT, PAGE_SIZE); | |
7c8c6b97 | 199 | |
37dd2bad KG |
200 | min_low_pfn = MEMORY_START >> PAGE_SHIFT; |
201 | boot_mapsize = init_bootmem_node(NODE_DATA(0), start >> PAGE_SHIFT, min_low_pfn, max_low_pfn); | |
7c8c6b97 | 202 | |
c67c3cb4 MG |
203 | /* Add active regions with valid PFNs */ |
204 | for (i = 0; i < lmb.memory.cnt; i++) { | |
205 | unsigned long start_pfn, end_pfn; | |
206 | start_pfn = lmb.memory.region[i].base >> PAGE_SHIFT; | |
207 | end_pfn = start_pfn + lmb_size_pages(&lmb.memory, i); | |
208 | add_active_range(0, start_pfn, end_pfn); | |
209 | } | |
210 | ||
7c8c6b97 PM |
211 | /* Add all physical memory to the bootmem map, mark each area |
212 | * present. | |
213 | */ | |
7c8c6b97 | 214 | #ifdef CONFIG_HIGHMEM |
d7917ba7 | 215 | free_bootmem_with_active_regions(0, lowmem_end_addr >> PAGE_SHIFT); |
f98eeb4e KG |
216 | |
217 | /* reserve the sections we're already using */ | |
218 | for (i = 0; i < lmb.reserved.cnt; i++) { | |
219 | unsigned long addr = lmb.reserved.region[i].base + | |
220 | lmb_size_bytes(&lmb.reserved, i) - 1; | |
d7917ba7 | 221 | if (addr < lowmem_end_addr) |
f98eeb4e | 222 | reserve_bootmem(lmb.reserved.region[i].base, |
72a7fe39 BW |
223 | lmb_size_bytes(&lmb.reserved, i), |
224 | BOOTMEM_DEFAULT); | |
d7917ba7 KG |
225 | else if (lmb.reserved.region[i].base < lowmem_end_addr) { |
226 | unsigned long adjusted_size = lowmem_end_addr - | |
f98eeb4e KG |
227 | lmb.reserved.region[i].base; |
228 | reserve_bootmem(lmb.reserved.region[i].base, | |
72a7fe39 | 229 | adjusted_size, BOOTMEM_DEFAULT); |
f98eeb4e KG |
230 | } |
231 | } | |
c67c3cb4 MG |
232 | #else |
233 | free_bootmem_with_active_regions(0, max_pfn); | |
7c8c6b97 PM |
234 | |
235 | /* reserve the sections we're already using */ | |
236 | for (i = 0; i < lmb.reserved.cnt; i++) | |
237 | reserve_bootmem(lmb.reserved.region[i].base, | |
72a7fe39 BW |
238 | lmb_size_bytes(&lmb.reserved, i), |
239 | BOOTMEM_DEFAULT); | |
7c8c6b97 | 240 | |
f98eeb4e | 241 | #endif |
7c8c6b97 | 242 | /* XXX need to clip this if using highmem? */ |
c67c3cb4 MG |
243 | sparse_memory_present_with_active_regions(0); |
244 | ||
7c8c6b97 PM |
245 | init_bootmem_done = 1; |
246 | } | |
247 | ||
4e8ad3e8 JB |
248 | /* mark pages that don't exist as nosave */ |
249 | static int __init mark_nonram_nosave(void) | |
250 | { | |
251 | unsigned long lmb_next_region_start_pfn, | |
252 | lmb_region_max_pfn; | |
253 | int i; | |
254 | ||
255 | for (i = 0; i < lmb.memory.cnt - 1; i++) { | |
256 | lmb_region_max_pfn = | |
257 | (lmb.memory.region[i].base >> PAGE_SHIFT) + | |
258 | (lmb.memory.region[i].size >> PAGE_SHIFT); | |
259 | lmb_next_region_start_pfn = | |
260 | lmb.memory.region[i+1].base >> PAGE_SHIFT; | |
261 | ||
262 | if (lmb_region_max_pfn < lmb_next_region_start_pfn) | |
263 | register_nosave_region(lmb_region_max_pfn, | |
264 | lmb_next_region_start_pfn); | |
265 | } | |
266 | ||
267 | return 0; | |
268 | } | |
269 | ||
7c8c6b97 PM |
270 | /* |
271 | * paging_init() sets up the page tables - in fact we've already done this. | |
272 | */ | |
273 | void __init paging_init(void) | |
274 | { | |
7c8c6b97 | 275 | unsigned long total_ram = lmb_phys_mem_size(); |
2bf3016f | 276 | phys_addr_t top_of_ram = lmb_end_of_DRAM(); |
c67c3cb4 | 277 | unsigned long max_zone_pfns[MAX_NR_ZONES]; |
7c8c6b97 | 278 | |
2c419bde KG |
279 | #ifdef CONFIG_PPC32 |
280 | unsigned long v = __fix_to_virt(__end_of_fixed_addresses - 1); | |
281 | unsigned long end = __fix_to_virt(FIX_HOLE); | |
282 | ||
283 | for (; v < end; v += PAGE_SIZE) | |
284 | map_page(v, 0, 0); /* XXX gross */ | |
285 | #endif | |
286 | ||
7c8c6b97 PM |
287 | #ifdef CONFIG_HIGHMEM |
288 | map_page(PKMAP_BASE, 0, 0); /* XXX gross */ | |
2c419bde KG |
289 | pkmap_page_table = virt_to_kpte(PKMAP_BASE); |
290 | ||
291 | kmap_pte = virt_to_kpte(__fix_to_virt(FIX_KMAP_BEGIN)); | |
7c8c6b97 PM |
292 | kmap_prot = PAGE_KERNEL; |
293 | #endif /* CONFIG_HIGHMEM */ | |
294 | ||
2bf3016f | 295 | printk(KERN_DEBUG "Top of RAM: 0x%llx, Total RAM: 0x%lx\n", |
fb610635 | 296 | (unsigned long long)top_of_ram, total_ram); |
e110b281 | 297 | printk(KERN_DEBUG "Memory hole size: %ldMB\n", |
2bf3016f | 298 | (long int)((top_of_ram - total_ram) >> 20)); |
6391af17 | 299 | memset(max_zone_pfns, 0, sizeof(max_zone_pfns)); |
7c8c6b97 | 300 | #ifdef CONFIG_HIGHMEM |
d7917ba7 | 301 | max_zone_pfns[ZONE_DMA] = lowmem_end_addr >> PAGE_SHIFT; |
6391af17 | 302 | max_zone_pfns[ZONE_HIGHMEM] = top_of_ram >> PAGE_SHIFT; |
7c8c6b97 | 303 | #else |
6391af17 | 304 | max_zone_pfns[ZONE_DMA] = top_of_ram >> PAGE_SHIFT; |
c67c3cb4 MG |
305 | #endif |
306 | free_area_init_nodes(max_zone_pfns); | |
4e8ad3e8 JB |
307 | |
308 | mark_nonram_nosave(); | |
7c8c6b97 PM |
309 | } |
310 | #endif /* ! CONFIG_NEED_MULTIPLE_NODES */ | |
311 | ||
312 | void __init mem_init(void) | |
313 | { | |
314 | #ifdef CONFIG_NEED_MULTIPLE_NODES | |
315 | int nid; | |
316 | #endif | |
317 | pg_data_t *pgdat; | |
318 | unsigned long i; | |
319 | struct page *page; | |
320 | unsigned long reservedpages = 0, codesize, initsize, datasize, bsssize; | |
321 | ||
fb6d73d3 | 322 | num_physpages = lmb.memory.size >> PAGE_SHIFT; |
7c8c6b97 PM |
323 | high_memory = (void *) __va(max_low_pfn * PAGE_SIZE); |
324 | ||
325 | #ifdef CONFIG_NEED_MULTIPLE_NODES | |
326 | for_each_online_node(nid) { | |
327 | if (NODE_DATA(nid)->node_spanned_pages != 0) { | |
c258dd40 | 328 | printk("freeing bootmem node %d\n", nid); |
7c8c6b97 PM |
329 | totalram_pages += |
330 | free_all_bootmem_node(NODE_DATA(nid)); | |
331 | } | |
332 | } | |
333 | #else | |
fb6d73d3 | 334 | max_mapnr = max_pfn; |
7c8c6b97 PM |
335 | totalram_pages += free_all_bootmem(); |
336 | #endif | |
ec936fc5 | 337 | for_each_online_pgdat(pgdat) { |
7c8c6b97 | 338 | for (i = 0; i < pgdat->node_spanned_pages; i++) { |
fb6d73d3 PM |
339 | if (!pfn_valid(pgdat->node_start_pfn + i)) |
340 | continue; | |
7c8c6b97 PM |
341 | page = pgdat_page_nr(pgdat, i); |
342 | if (PageReserved(page)) | |
343 | reservedpages++; | |
344 | } | |
345 | } | |
346 | ||
347 | codesize = (unsigned long)&_sdata - (unsigned long)&_stext; | |
bcb35576 | 348 | datasize = (unsigned long)&_edata - (unsigned long)&_sdata; |
7c8c6b97 PM |
349 | initsize = (unsigned long)&__init_end - (unsigned long)&__init_begin; |
350 | bsssize = (unsigned long)&__bss_stop - (unsigned long)&__bss_start; | |
351 | ||
352 | #ifdef CONFIG_HIGHMEM | |
353 | { | |
354 | unsigned long pfn, highmem_mapnr; | |
355 | ||
d7917ba7 | 356 | highmem_mapnr = lowmem_end_addr >> PAGE_SHIFT; |
7c8c6b97 PM |
357 | for (pfn = highmem_mapnr; pfn < max_mapnr; ++pfn) { |
358 | struct page *page = pfn_to_page(pfn); | |
f98eeb4e KG |
359 | if (lmb_is_reserved(pfn << PAGE_SHIFT)) |
360 | continue; | |
7c8c6b97 | 361 | ClearPageReserved(page); |
7835e98b | 362 | init_page_count(page); |
7c8c6b97 PM |
363 | __free_page(page); |
364 | totalhigh_pages++; | |
f98eeb4e | 365 | reservedpages--; |
7c8c6b97 PM |
366 | } |
367 | totalram_pages += totalhigh_pages; | |
e110b281 | 368 | printk(KERN_DEBUG "High memory: %luk\n", |
7c8c6b97 PM |
369 | totalhigh_pages << (PAGE_SHIFT-10)); |
370 | } | |
371 | #endif /* CONFIG_HIGHMEM */ | |
372 | ||
373 | printk(KERN_INFO "Memory: %luk/%luk available (%luk kernel code, " | |
374 | "%luk reserved, %luk data, %luk bss, %luk init)\n", | |
375 | (unsigned long)nr_free_pages() << (PAGE_SHIFT-10), | |
376 | num_physpages << (PAGE_SHIFT-10), | |
377 | codesize >> 10, | |
378 | reservedpages << (PAGE_SHIFT-10), | |
379 | datasize >> 10, | |
380 | bsssize >> 10, | |
381 | initsize >> 10); | |
382 | ||
383 | mem_init_done = 1; | |
7c8c6b97 PM |
384 | } |
385 | ||
14cf11af PM |
386 | /* |
387 | * This is called when a page has been modified by the kernel. | |
388 | * It just marks the page as not i-cache clean. We do the i-cache | |
389 | * flush later when the page is given to a user process, if necessary. | |
390 | */ | |
391 | void flush_dcache_page(struct page *page) | |
392 | { | |
393 | if (cpu_has_feature(CPU_FTR_COHERENT_ICACHE)) | |
394 | return; | |
395 | /* avoid an atomic op if possible */ | |
396 | if (test_bit(PG_arch_1, &page->flags)) | |
397 | clear_bit(PG_arch_1, &page->flags); | |
398 | } | |
399 | EXPORT_SYMBOL(flush_dcache_page); | |
400 | ||
401 | void flush_dcache_icache_page(struct page *page) | |
402 | { | |
403 | #ifdef CONFIG_BOOKE | |
404 | void *start = kmap_atomic(page, KM_PPC_SYNC_ICACHE); | |
405 | __flush_dcache_icache(start); | |
406 | kunmap_atomic(start, KM_PPC_SYNC_ICACHE); | |
ab1f9dac | 407 | #elif defined(CONFIG_8xx) || defined(CONFIG_PPC64) |
14cf11af PM |
408 | /* On 8xx there is no need to kmap since highmem is not supported */ |
409 | __flush_dcache_icache(page_address(page)); | |
410 | #else | |
411 | __flush_dcache_icache_phys(page_to_pfn(page) << PAGE_SHIFT); | |
412 | #endif | |
413 | ||
414 | } | |
415 | void clear_user_page(void *page, unsigned long vaddr, struct page *pg) | |
416 | { | |
417 | clear_page(page); | |
418 | ||
14cf11af PM |
419 | /* |
420 | * We shouldnt have to do this, but some versions of glibc | |
421 | * require it (ld.so assumes zero filled pages are icache clean) | |
422 | * - Anton | |
423 | */ | |
09f5dc44 | 424 | flush_dcache_page(pg); |
14cf11af PM |
425 | } |
426 | EXPORT_SYMBOL(clear_user_page); | |
427 | ||
428 | void copy_user_page(void *vto, void *vfrom, unsigned long vaddr, | |
429 | struct page *pg) | |
430 | { | |
431 | copy_page(vto, vfrom); | |
432 | ||
433 | /* | |
434 | * We should be able to use the following optimisation, however | |
435 | * there are two problems. | |
436 | * Firstly a bug in some versions of binutils meant PLT sections | |
437 | * were not marked executable. | |
438 | * Secondly the first word in the GOT section is blrl, used | |
439 | * to establish the GOT address. Until recently the GOT was | |
440 | * not marked executable. | |
441 | * - Anton | |
442 | */ | |
443 | #if 0 | |
444 | if (!vma->vm_file && ((vma->vm_flags & VM_EXEC) == 0)) | |
445 | return; | |
446 | #endif | |
447 | ||
09f5dc44 | 448 | flush_dcache_page(pg); |
14cf11af PM |
449 | } |
450 | ||
451 | void flush_icache_user_range(struct vm_area_struct *vma, struct page *page, | |
452 | unsigned long addr, int len) | |
453 | { | |
454 | unsigned long maddr; | |
455 | ||
456 | maddr = (unsigned long) kmap(page) + (addr & ~PAGE_MASK); | |
457 | flush_icache_range(maddr, maddr + len); | |
458 | kunmap(page); | |
459 | } | |
460 | EXPORT_SYMBOL(flush_icache_user_range); | |
461 | ||
462 | /* | |
463 | * This is called at the end of handling a user page fault, when the | |
464 | * fault has been handled by updating a PTE in the linux page tables. | |
465 | * We use it to preload an HPTE into the hash table corresponding to | |
466 | * the updated linux PTE. | |
467 | * | |
01edcd89 | 468 | * This must always be called with the pte lock held. |
14cf11af PM |
469 | */ |
470 | void update_mmu_cache(struct vm_area_struct *vma, unsigned long address, | |
471 | pte_t pte) | |
472 | { | |
3c726f8d BH |
473 | #ifdef CONFIG_PPC_STD_MMU |
474 | unsigned long access = 0, trap; | |
14cf11af | 475 | #endif |
3c726f8d | 476 | unsigned long pfn = pte_pfn(pte); |
14cf11af PM |
477 | |
478 | /* handle i-cache coherency */ | |
479 | if (!cpu_has_feature(CPU_FTR_COHERENT_ICACHE) && | |
480 | !cpu_has_feature(CPU_FTR_NOEXECUTE) && | |
481 | pfn_valid(pfn)) { | |
482 | struct page *page = pfn_to_page(pfn); | |
dbbb06b7 VB |
483 | #ifdef CONFIG_8xx |
484 | /* On 8xx, cache control instructions (particularly | |
485 | * "dcbst" from flush_dcache_icache) fault as write | |
486 | * operation if there is an unpopulated TLB entry | |
487 | * for the address in question. To workaround that, | |
488 | * we invalidate the TLB here, thus avoiding dcbst | |
489 | * misbehaviour. | |
490 | */ | |
f048aace | 491 | _tlbil_va(address, 0 /* 8xx doesn't care about PID */); |
dbbb06b7 | 492 | #endif |
551ed332 SW |
493 | /* The _PAGE_USER test should really be _PAGE_EXEC, but |
494 | * older glibc versions execute some code from no-exec | |
495 | * pages, which for now we are supporting. If exec-only | |
496 | * pages are ever implemented, this will have to change. | |
497 | */ | |
498 | if (!PageReserved(page) && (pte_val(pte) & _PAGE_USER) | |
14cf11af PM |
499 | && !test_bit(PG_arch_1, &page->flags)) { |
500 | if (vma->vm_mm == current->active_mm) { | |
14cf11af PM |
501 | __flush_dcache_icache((void *) address); |
502 | } else | |
503 | flush_dcache_icache_page(page); | |
504 | set_bit(PG_arch_1, &page->flags); | |
505 | } | |
506 | } | |
507 | ||
508 | #ifdef CONFIG_PPC_STD_MMU | |
509 | /* We only want HPTEs for linux PTEs that have _PAGE_ACCESSED set */ | |
510 | if (!pte_young(pte) || address >= TASK_SIZE) | |
511 | return; | |
14cf11af | 512 | |
3c726f8d BH |
513 | /* We try to figure out if we are coming from an instruction |
514 | * access fault and pass that down to __hash_page so we avoid | |
515 | * double-faulting on execution of fresh text. We have to test | |
516 | * for regs NULL since init will get here first thing at boot | |
517 | * | |
518 | * We also avoid filling the hash if not coming from a fault | |
519 | */ | |
520 | if (current->thread.regs == NULL) | |
14cf11af | 521 | return; |
3c726f8d BH |
522 | trap = TRAP(current->thread.regs); |
523 | if (trap == 0x400) | |
524 | access |= _PAGE_EXEC; | |
525 | else if (trap != 0x300) | |
526 | return; | |
527 | hash_preload(vma->vm_mm, address, access, trap); | |
528 | #endif /* CONFIG_PPC_STD_MMU */ | |
14cf11af | 529 | } |