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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> |
0895ecda | 35 | #include <linux/hugetlb.h> |
14cf11af PM |
36 | |
37 | #include <asm/pgalloc.h> | |
38 | #include <asm/prom.h> | |
39 | #include <asm/io.h> | |
40 | #include <asm/mmu_context.h> | |
41 | #include <asm/pgtable.h> | |
42 | #include <asm/mmu.h> | |
43 | #include <asm/smp.h> | |
44 | #include <asm/machdep.h> | |
45 | #include <asm/btext.h> | |
46 | #include <asm/tlb.h> | |
7c8c6b97 | 47 | #include <asm/sections.h> |
db7f37de | 48 | #include <asm/sparsemem.h> |
ab1f9dac | 49 | #include <asm/vdso.h> |
2c419bde | 50 | #include <asm/fixmap.h> |
14cf11af | 51 | |
14cf11af PM |
52 | #include "mmu_decl.h" |
53 | ||
54 | #ifndef CPU_FTR_COHERENT_ICACHE | |
55 | #define CPU_FTR_COHERENT_ICACHE 0 /* XXX for now */ | |
56 | #define CPU_FTR_NOEXECUTE 0 | |
57 | #endif | |
58 | ||
7c8c6b97 PM |
59 | int init_bootmem_done; |
60 | int mem_init_done; | |
49a84965 | 61 | phys_addr_t memory_limit; |
7c8c6b97 | 62 | |
2c419bde KG |
63 | #ifdef CONFIG_HIGHMEM |
64 | pte_t *kmap_pte; | |
65 | pgprot_t kmap_prot; | |
66 | ||
67 | EXPORT_SYMBOL(kmap_prot); | |
68 | EXPORT_SYMBOL(kmap_pte); | |
69 | ||
70 | static inline pte_t *virt_to_kpte(unsigned long vaddr) | |
71 | { | |
72 | return pte_offset_kernel(pmd_offset(pud_offset(pgd_offset_k(vaddr), | |
73 | vaddr), vaddr), vaddr); | |
74 | } | |
75 | #endif | |
76 | ||
14cf11af PM |
77 | int page_is_ram(unsigned long pfn) |
78 | { | |
14cf11af | 79 | #ifndef CONFIG_PPC64 /* XXX for now */ |
a880e762 | 80 | return pfn < max_pfn; |
14cf11af | 81 | #else |
a880e762 | 82 | unsigned long paddr = (pfn << PAGE_SHIFT); |
14cf11af PM |
83 | int i; |
84 | for (i=0; i < lmb.memory.cnt; i++) { | |
85 | unsigned long base; | |
86 | ||
87 | base = lmb.memory.region[i].base; | |
88 | ||
89 | if ((paddr >= base) && | |
90 | (paddr < (base + lmb.memory.region[i].size))) { | |
91 | return 1; | |
92 | } | |
93 | } | |
94 | ||
95 | return 0; | |
96 | #endif | |
97 | } | |
14cf11af | 98 | |
8b150478 | 99 | pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn, |
14cf11af PM |
100 | unsigned long size, pgprot_t vma_prot) |
101 | { | |
102 | if (ppc_md.phys_mem_access_prot) | |
8b150478 | 103 | return ppc_md.phys_mem_access_prot(file, pfn, size, vma_prot); |
14cf11af | 104 | |
8b150478 | 105 | if (!page_is_ram(pfn)) |
64b3d0e8 BH |
106 | vma_prot = pgprot_noncached(vma_prot); |
107 | ||
14cf11af PM |
108 | return vma_prot; |
109 | } | |
110 | EXPORT_SYMBOL(phys_mem_access_prot); | |
111 | ||
23fd0775 PM |
112 | #ifdef CONFIG_MEMORY_HOTPLUG |
113 | ||
bc02af93 YG |
114 | #ifdef CONFIG_NUMA |
115 | int memory_add_physaddr_to_nid(u64 start) | |
116 | { | |
117 | return hot_add_scn_to_nid(start); | |
118 | } | |
119 | #endif | |
120 | ||
fa90f70a | 121 | int arch_add_memory(int nid, u64 start, u64 size) |
23fd0775 | 122 | { |
237a0989 | 123 | struct pglist_data *pgdata; |
23fd0775 PM |
124 | struct zone *zone; |
125 | unsigned long start_pfn = start >> PAGE_SHIFT; | |
126 | unsigned long nr_pages = size >> PAGE_SHIFT; | |
127 | ||
237a0989 MK |
128 | pgdata = NODE_DATA(nid); |
129 | ||
2d0eee14 | 130 | start = (unsigned long)__va(start); |
54b79248 MK |
131 | create_section_mapping(start, start + size); |
132 | ||
23fd0775 PM |
133 | /* this should work for most non-highmem platforms */ |
134 | zone = pgdata->node_zones; | |
135 | ||
c04fc586 | 136 | return __add_pages(nid, zone, start_pfn, nr_pages); |
23fd0775 | 137 | } |
0d579944 | 138 | #endif /* CONFIG_MEMORY_HOTPLUG */ |
a99824f3 BP |
139 | |
140 | /* | |
141 | * walk_memory_resource() needs to make sure there is no holes in a given | |
9d88a2eb BP |
142 | * memory range. PPC64 does not maintain the memory layout in /proc/iomem. |
143 | * Instead it maintains it in lmb.memory structures. Walk through the | |
144 | * memory regions, find holes and callback for contiguous regions. | |
a99824f3 BP |
145 | */ |
146 | int | |
908eedc6 KH |
147 | walk_system_ram_range(unsigned long start_pfn, unsigned long nr_pages, |
148 | void *arg, int (*func)(unsigned long, unsigned long, void *)) | |
a99824f3 | 149 | { |
9d88a2eb BP |
150 | struct lmb_property res; |
151 | unsigned long pfn, len; | |
152 | u64 end; | |
153 | int ret = -1; | |
154 | ||
155 | res.base = (u64) start_pfn << PAGE_SHIFT; | |
156 | res.size = (u64) nr_pages << PAGE_SHIFT; | |
157 | ||
158 | end = res.base + res.size - 1; | |
159 | while ((res.base < end) && (lmb_find(&res) >= 0)) { | |
160 | pfn = (unsigned long)(res.base >> PAGE_SHIFT); | |
161 | len = (unsigned long)(res.size >> PAGE_SHIFT); | |
162 | ret = (*func)(pfn, len, arg); | |
163 | if (ret) | |
164 | break; | |
165 | res.base += (res.size + 1); | |
166 | res.size = (end - res.base + 1); | |
167 | } | |
168 | return ret; | |
a99824f3 | 169 | } |
908eedc6 | 170 | EXPORT_SYMBOL_GPL(walk_system_ram_range); |
a99824f3 | 171 | |
7c8c6b97 PM |
172 | /* |
173 | * Initialize the bootmem system and give it all the memory we | |
174 | * have available. If we are using highmem, we only put the | |
175 | * lowmem into the bootmem system. | |
176 | */ | |
177 | #ifndef CONFIG_NEED_MULTIPLE_NODES | |
178 | void __init do_init_bootmem(void) | |
179 | { | |
180 | unsigned long i; | |
181 | unsigned long start, bootmap_pages; | |
182 | unsigned long total_pages; | |
183 | int boot_mapsize; | |
184 | ||
37dd2bad | 185 | max_low_pfn = max_pfn = lmb_end_of_DRAM() >> PAGE_SHIFT; |
d7917ba7 | 186 | total_pages = (lmb_end_of_DRAM() - memstart_addr) >> PAGE_SHIFT; |
7c8c6b97 PM |
187 | #ifdef CONFIG_HIGHMEM |
188 | total_pages = total_lowmem >> PAGE_SHIFT; | |
d7917ba7 | 189 | max_low_pfn = lowmem_end_addr >> PAGE_SHIFT; |
7c8c6b97 PM |
190 | #endif |
191 | ||
192 | /* | |
193 | * Find an area to use for the bootmem bitmap. Calculate the size of | |
194 | * bitmap required as (Total Memory) / PAGE_SIZE / BITS_PER_BYTE. | |
195 | * Add 1 additional page in case the address isn't page-aligned. | |
196 | */ | |
197 | bootmap_pages = bootmem_bootmap_pages(total_pages); | |
198 | ||
199 | start = lmb_alloc(bootmap_pages << PAGE_SHIFT, PAGE_SIZE); | |
7c8c6b97 | 200 | |
37dd2bad KG |
201 | min_low_pfn = MEMORY_START >> PAGE_SHIFT; |
202 | boot_mapsize = init_bootmem_node(NODE_DATA(0), start >> PAGE_SHIFT, min_low_pfn, max_low_pfn); | |
7c8c6b97 | 203 | |
c67c3cb4 MG |
204 | /* Add active regions with valid PFNs */ |
205 | for (i = 0; i < lmb.memory.cnt; i++) { | |
206 | unsigned long start_pfn, end_pfn; | |
207 | start_pfn = lmb.memory.region[i].base >> PAGE_SHIFT; | |
208 | end_pfn = start_pfn + lmb_size_pages(&lmb.memory, i); | |
209 | add_active_range(0, start_pfn, end_pfn); | |
210 | } | |
211 | ||
7c8c6b97 PM |
212 | /* Add all physical memory to the bootmem map, mark each area |
213 | * present. | |
214 | */ | |
7c8c6b97 | 215 | #ifdef CONFIG_HIGHMEM |
d7917ba7 | 216 | free_bootmem_with_active_regions(0, lowmem_end_addr >> PAGE_SHIFT); |
f98eeb4e KG |
217 | |
218 | /* reserve the sections we're already using */ | |
219 | for (i = 0; i < lmb.reserved.cnt; i++) { | |
220 | unsigned long addr = lmb.reserved.region[i].base + | |
221 | lmb_size_bytes(&lmb.reserved, i) - 1; | |
d7917ba7 | 222 | if (addr < lowmem_end_addr) |
f98eeb4e | 223 | reserve_bootmem(lmb.reserved.region[i].base, |
72a7fe39 BW |
224 | lmb_size_bytes(&lmb.reserved, i), |
225 | BOOTMEM_DEFAULT); | |
d7917ba7 KG |
226 | else if (lmb.reserved.region[i].base < lowmem_end_addr) { |
227 | unsigned long adjusted_size = lowmem_end_addr - | |
f98eeb4e KG |
228 | lmb.reserved.region[i].base; |
229 | reserve_bootmem(lmb.reserved.region[i].base, | |
72a7fe39 | 230 | adjusted_size, BOOTMEM_DEFAULT); |
f98eeb4e KG |
231 | } |
232 | } | |
c67c3cb4 MG |
233 | #else |
234 | free_bootmem_with_active_regions(0, max_pfn); | |
7c8c6b97 PM |
235 | |
236 | /* reserve the sections we're already using */ | |
237 | for (i = 0; i < lmb.reserved.cnt; i++) | |
238 | reserve_bootmem(lmb.reserved.region[i].base, | |
72a7fe39 BW |
239 | lmb_size_bytes(&lmb.reserved, i), |
240 | BOOTMEM_DEFAULT); | |
7c8c6b97 | 241 | |
f98eeb4e | 242 | #endif |
7c8c6b97 | 243 | /* XXX need to clip this if using highmem? */ |
c67c3cb4 MG |
244 | sparse_memory_present_with_active_regions(0); |
245 | ||
7c8c6b97 PM |
246 | init_bootmem_done = 1; |
247 | } | |
248 | ||
4e8ad3e8 JB |
249 | /* mark pages that don't exist as nosave */ |
250 | static int __init mark_nonram_nosave(void) | |
251 | { | |
252 | unsigned long lmb_next_region_start_pfn, | |
253 | lmb_region_max_pfn; | |
254 | int i; | |
255 | ||
256 | for (i = 0; i < lmb.memory.cnt - 1; i++) { | |
257 | lmb_region_max_pfn = | |
258 | (lmb.memory.region[i].base >> PAGE_SHIFT) + | |
259 | (lmb.memory.region[i].size >> PAGE_SHIFT); | |
260 | lmb_next_region_start_pfn = | |
261 | lmb.memory.region[i+1].base >> PAGE_SHIFT; | |
262 | ||
263 | if (lmb_region_max_pfn < lmb_next_region_start_pfn) | |
264 | register_nosave_region(lmb_region_max_pfn, | |
265 | lmb_next_region_start_pfn); | |
266 | } | |
267 | ||
268 | return 0; | |
269 | } | |
270 | ||
7c8c6b97 PM |
271 | /* |
272 | * paging_init() sets up the page tables - in fact we've already done this. | |
273 | */ | |
274 | void __init paging_init(void) | |
275 | { | |
7c8c6b97 | 276 | unsigned long total_ram = lmb_phys_mem_size(); |
2bf3016f | 277 | phys_addr_t top_of_ram = lmb_end_of_DRAM(); |
c67c3cb4 | 278 | unsigned long max_zone_pfns[MAX_NR_ZONES]; |
7c8c6b97 | 279 | |
2c419bde KG |
280 | #ifdef CONFIG_PPC32 |
281 | unsigned long v = __fix_to_virt(__end_of_fixed_addresses - 1); | |
282 | unsigned long end = __fix_to_virt(FIX_HOLE); | |
283 | ||
284 | for (; v < end; v += PAGE_SIZE) | |
285 | map_page(v, 0, 0); /* XXX gross */ | |
286 | #endif | |
287 | ||
7c8c6b97 PM |
288 | #ifdef CONFIG_HIGHMEM |
289 | map_page(PKMAP_BASE, 0, 0); /* XXX gross */ | |
2c419bde KG |
290 | pkmap_page_table = virt_to_kpte(PKMAP_BASE); |
291 | ||
292 | kmap_pte = virt_to_kpte(__fix_to_virt(FIX_KMAP_BEGIN)); | |
7c8c6b97 PM |
293 | kmap_prot = PAGE_KERNEL; |
294 | #endif /* CONFIG_HIGHMEM */ | |
295 | ||
2bf3016f | 296 | printk(KERN_DEBUG "Top of RAM: 0x%llx, Total RAM: 0x%lx\n", |
fb610635 | 297 | (unsigned long long)top_of_ram, total_ram); |
e110b281 | 298 | printk(KERN_DEBUG "Memory hole size: %ldMB\n", |
2bf3016f | 299 | (long int)((top_of_ram - total_ram) >> 20)); |
6391af17 | 300 | memset(max_zone_pfns, 0, sizeof(max_zone_pfns)); |
7c8c6b97 | 301 | #ifdef CONFIG_HIGHMEM |
d7917ba7 | 302 | max_zone_pfns[ZONE_DMA] = lowmem_end_addr >> PAGE_SHIFT; |
6391af17 | 303 | max_zone_pfns[ZONE_HIGHMEM] = top_of_ram >> PAGE_SHIFT; |
7c8c6b97 | 304 | #else |
6391af17 | 305 | max_zone_pfns[ZONE_DMA] = top_of_ram >> PAGE_SHIFT; |
c67c3cb4 MG |
306 | #endif |
307 | free_area_init_nodes(max_zone_pfns); | |
4e8ad3e8 JB |
308 | |
309 | mark_nonram_nosave(); | |
7c8c6b97 PM |
310 | } |
311 | #endif /* ! CONFIG_NEED_MULTIPLE_NODES */ | |
312 | ||
313 | void __init mem_init(void) | |
314 | { | |
315 | #ifdef CONFIG_NEED_MULTIPLE_NODES | |
316 | int nid; | |
317 | #endif | |
318 | pg_data_t *pgdat; | |
319 | unsigned long i; | |
320 | struct page *page; | |
321 | unsigned long reservedpages = 0, codesize, initsize, datasize, bsssize; | |
322 | ||
fb6d73d3 | 323 | num_physpages = lmb.memory.size >> PAGE_SHIFT; |
7c8c6b97 PM |
324 | high_memory = (void *) __va(max_low_pfn * PAGE_SIZE); |
325 | ||
326 | #ifdef CONFIG_NEED_MULTIPLE_NODES | |
327 | for_each_online_node(nid) { | |
328 | if (NODE_DATA(nid)->node_spanned_pages != 0) { | |
c258dd40 | 329 | printk("freeing bootmem node %d\n", nid); |
7c8c6b97 PM |
330 | totalram_pages += |
331 | free_all_bootmem_node(NODE_DATA(nid)); | |
332 | } | |
333 | } | |
334 | #else | |
fb6d73d3 | 335 | max_mapnr = max_pfn; |
7c8c6b97 PM |
336 | totalram_pages += free_all_bootmem(); |
337 | #endif | |
ec936fc5 | 338 | for_each_online_pgdat(pgdat) { |
7c8c6b97 | 339 | for (i = 0; i < pgdat->node_spanned_pages; i++) { |
fb6d73d3 PM |
340 | if (!pfn_valid(pgdat->node_start_pfn + i)) |
341 | continue; | |
7c8c6b97 PM |
342 | page = pgdat_page_nr(pgdat, i); |
343 | if (PageReserved(page)) | |
344 | reservedpages++; | |
345 | } | |
346 | } | |
347 | ||
348 | codesize = (unsigned long)&_sdata - (unsigned long)&_stext; | |
bcb35576 | 349 | datasize = (unsigned long)&_edata - (unsigned long)&_sdata; |
7c8c6b97 PM |
350 | initsize = (unsigned long)&__init_end - (unsigned long)&__init_begin; |
351 | bsssize = (unsigned long)&__bss_stop - (unsigned long)&__bss_start; | |
352 | ||
353 | #ifdef CONFIG_HIGHMEM | |
354 | { | |
355 | unsigned long pfn, highmem_mapnr; | |
356 | ||
d7917ba7 | 357 | highmem_mapnr = lowmem_end_addr >> PAGE_SHIFT; |
7c8c6b97 PM |
358 | for (pfn = highmem_mapnr; pfn < max_mapnr; ++pfn) { |
359 | struct page *page = pfn_to_page(pfn); | |
f98eeb4e KG |
360 | if (lmb_is_reserved(pfn << PAGE_SHIFT)) |
361 | continue; | |
7c8c6b97 | 362 | ClearPageReserved(page); |
7835e98b | 363 | init_page_count(page); |
7c8c6b97 PM |
364 | __free_page(page); |
365 | totalhigh_pages++; | |
f98eeb4e | 366 | reservedpages--; |
7c8c6b97 PM |
367 | } |
368 | totalram_pages += totalhigh_pages; | |
e110b281 | 369 | printk(KERN_DEBUG "High memory: %luk\n", |
7c8c6b97 PM |
370 | totalhigh_pages << (PAGE_SHIFT-10)); |
371 | } | |
372 | #endif /* CONFIG_HIGHMEM */ | |
373 | ||
374 | printk(KERN_INFO "Memory: %luk/%luk available (%luk kernel code, " | |
375 | "%luk reserved, %luk data, %luk bss, %luk init)\n", | |
cc013a88 | 376 | nr_free_pages() << (PAGE_SHIFT-10), |
7c8c6b97 PM |
377 | num_physpages << (PAGE_SHIFT-10), |
378 | codesize >> 10, | |
379 | reservedpages << (PAGE_SHIFT-10), | |
380 | datasize >> 10, | |
381 | bsssize >> 10, | |
382 | initsize >> 10); | |
383 | ||
f637a49e BH |
384 | #ifdef CONFIG_PPC32 |
385 | pr_info("Kernel virtual memory layout:\n"); | |
386 | pr_info(" * 0x%08lx..0x%08lx : fixmap\n", FIXADDR_START, FIXADDR_TOP); | |
387 | #ifdef CONFIG_HIGHMEM | |
388 | pr_info(" * 0x%08lx..0x%08lx : highmem PTEs\n", | |
389 | PKMAP_BASE, PKMAP_ADDR(LAST_PKMAP)); | |
390 | #endif /* CONFIG_HIGHMEM */ | |
8b31e49d BH |
391 | #ifdef CONFIG_NOT_COHERENT_CACHE |
392 | pr_info(" * 0x%08lx..0x%08lx : consistent mem\n", | |
393 | IOREMAP_TOP, IOREMAP_TOP + CONFIG_CONSISTENT_SIZE); | |
394 | #endif /* CONFIG_NOT_COHERENT_CACHE */ | |
f637a49e BH |
395 | pr_info(" * 0x%08lx..0x%08lx : early ioremap\n", |
396 | ioremap_bot, IOREMAP_TOP); | |
397 | pr_info(" * 0x%08lx..0x%08lx : vmalloc & ioremap\n", | |
398 | VMALLOC_START, VMALLOC_END); | |
399 | #endif /* CONFIG_PPC32 */ | |
400 | ||
7c8c6b97 | 401 | mem_init_done = 1; |
7c8c6b97 PM |
402 | } |
403 | ||
14cf11af PM |
404 | /* |
405 | * This is called when a page has been modified by the kernel. | |
406 | * It just marks the page as not i-cache clean. We do the i-cache | |
407 | * flush later when the page is given to a user process, if necessary. | |
408 | */ | |
409 | void flush_dcache_page(struct page *page) | |
410 | { | |
411 | if (cpu_has_feature(CPU_FTR_COHERENT_ICACHE)) | |
412 | return; | |
413 | /* avoid an atomic op if possible */ | |
414 | if (test_bit(PG_arch_1, &page->flags)) | |
415 | clear_bit(PG_arch_1, &page->flags); | |
416 | } | |
417 | EXPORT_SYMBOL(flush_dcache_page); | |
418 | ||
419 | void flush_dcache_icache_page(struct page *page) | |
420 | { | |
0895ecda DG |
421 | #ifdef CONFIG_HUGETLB_PAGE |
422 | if (PageCompound(page)) { | |
423 | flush_dcache_icache_hugepage(page); | |
424 | return; | |
425 | } | |
426 | #endif | |
14cf11af | 427 | #ifdef CONFIG_BOOKE |
0895ecda DG |
428 | { |
429 | void *start = kmap_atomic(page, KM_PPC_SYNC_ICACHE); | |
430 | __flush_dcache_icache(start); | |
431 | kunmap_atomic(start, KM_PPC_SYNC_ICACHE); | |
432 | } | |
ab1f9dac | 433 | #elif defined(CONFIG_8xx) || defined(CONFIG_PPC64) |
14cf11af PM |
434 | /* On 8xx there is no need to kmap since highmem is not supported */ |
435 | __flush_dcache_icache(page_address(page)); | |
436 | #else | |
437 | __flush_dcache_icache_phys(page_to_pfn(page) << PAGE_SHIFT); | |
438 | #endif | |
14cf11af | 439 | } |
0895ecda | 440 | |
14cf11af PM |
441 | void clear_user_page(void *page, unsigned long vaddr, struct page *pg) |
442 | { | |
443 | clear_page(page); | |
444 | ||
14cf11af PM |
445 | /* |
446 | * We shouldnt have to do this, but some versions of glibc | |
447 | * require it (ld.so assumes zero filled pages are icache clean) | |
448 | * - Anton | |
449 | */ | |
09f5dc44 | 450 | flush_dcache_page(pg); |
14cf11af PM |
451 | } |
452 | EXPORT_SYMBOL(clear_user_page); | |
453 | ||
454 | void copy_user_page(void *vto, void *vfrom, unsigned long vaddr, | |
455 | struct page *pg) | |
456 | { | |
457 | copy_page(vto, vfrom); | |
458 | ||
459 | /* | |
460 | * We should be able to use the following optimisation, however | |
461 | * there are two problems. | |
462 | * Firstly a bug in some versions of binutils meant PLT sections | |
463 | * were not marked executable. | |
464 | * Secondly the first word in the GOT section is blrl, used | |
465 | * to establish the GOT address. Until recently the GOT was | |
466 | * not marked executable. | |
467 | * - Anton | |
468 | */ | |
469 | #if 0 | |
470 | if (!vma->vm_file && ((vma->vm_flags & VM_EXEC) == 0)) | |
471 | return; | |
472 | #endif | |
473 | ||
09f5dc44 | 474 | flush_dcache_page(pg); |
14cf11af PM |
475 | } |
476 | ||
477 | void flush_icache_user_range(struct vm_area_struct *vma, struct page *page, | |
478 | unsigned long addr, int len) | |
479 | { | |
480 | unsigned long maddr; | |
481 | ||
482 | maddr = (unsigned long) kmap(page) + (addr & ~PAGE_MASK); | |
483 | flush_icache_range(maddr, maddr + len); | |
484 | kunmap(page); | |
485 | } | |
486 | EXPORT_SYMBOL(flush_icache_user_range); | |
487 | ||
488 | /* | |
489 | * This is called at the end of handling a user page fault, when the | |
490 | * fault has been handled by updating a PTE in the linux page tables. | |
491 | * We use it to preload an HPTE into the hash table corresponding to | |
492 | * the updated linux PTE. | |
493 | * | |
01edcd89 | 494 | * This must always be called with the pte lock held. |
14cf11af PM |
495 | */ |
496 | void update_mmu_cache(struct vm_area_struct *vma, unsigned long address, | |
4b3073e1 | 497 | pte_t *ptep) |
14cf11af | 498 | { |
3c726f8d BH |
499 | #ifdef CONFIG_PPC_STD_MMU |
500 | unsigned long access = 0, trap; | |
14cf11af | 501 | |
14cf11af | 502 | /* We only want HPTEs for linux PTEs that have _PAGE_ACCESSED set */ |
4b3073e1 | 503 | if (!pte_young(*ptep) || address >= TASK_SIZE) |
14cf11af | 504 | return; |
14cf11af | 505 | |
3c726f8d BH |
506 | /* We try to figure out if we are coming from an instruction |
507 | * access fault and pass that down to __hash_page so we avoid | |
508 | * double-faulting on execution of fresh text. We have to test | |
509 | * for regs NULL since init will get here first thing at boot | |
510 | * | |
511 | * We also avoid filling the hash if not coming from a fault | |
512 | */ | |
513 | if (current->thread.regs == NULL) | |
14cf11af | 514 | return; |
3c726f8d BH |
515 | trap = TRAP(current->thread.regs); |
516 | if (trap == 0x400) | |
517 | access |= _PAGE_EXEC; | |
518 | else if (trap != 0x300) | |
519 | return; | |
520 | hash_preload(vma->vm_mm, address, access, trap); | |
521 | #endif /* CONFIG_PPC_STD_MMU */ | |
14cf11af | 522 | } |