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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> | |
5a0e3ad6 | 25 | #include <linux/gfp.h> |
14cf11af PM |
26 | #include <linux/types.h> |
27 | #include <linux/mm.h> | |
28 | #include <linux/stddef.h> | |
29 | #include <linux/init.h> | |
30 | #include <linux/bootmem.h> | |
31 | #include <linux/highmem.h> | |
32 | #include <linux/initrd.h> | |
33 | #include <linux/pagemap.h> | |
4e8ad3e8 | 34 | #include <linux/suspend.h> |
95f72d1e | 35 | #include <linux/memblock.h> |
0895ecda | 36 | #include <linux/hugetlb.h> |
14cf11af PM |
37 | |
38 | #include <asm/pgalloc.h> | |
39 | #include <asm/prom.h> | |
40 | #include <asm/io.h> | |
41 | #include <asm/mmu_context.h> | |
42 | #include <asm/pgtable.h> | |
43 | #include <asm/mmu.h> | |
44 | #include <asm/smp.h> | |
45 | #include <asm/machdep.h> | |
46 | #include <asm/btext.h> | |
47 | #include <asm/tlb.h> | |
7c8c6b97 | 48 | #include <asm/sections.h> |
db7f37de | 49 | #include <asm/sparsemem.h> |
ab1f9dac | 50 | #include <asm/vdso.h> |
2c419bde | 51 | #include <asm/fixmap.h> |
a9327296 | 52 | #include <asm/swiotlb.h> |
14cf11af | 53 | |
14cf11af PM |
54 | #include "mmu_decl.h" |
55 | ||
56 | #ifndef CPU_FTR_COHERENT_ICACHE | |
57 | #define CPU_FTR_COHERENT_ICACHE 0 /* XXX for now */ | |
58 | #define CPU_FTR_NOEXECUTE 0 | |
59 | #endif | |
60 | ||
7c8c6b97 PM |
61 | int init_bootmem_done; |
62 | int mem_init_done; | |
49a84965 | 63 | phys_addr_t memory_limit; |
7c8c6b97 | 64 | |
2c419bde KG |
65 | #ifdef CONFIG_HIGHMEM |
66 | pte_t *kmap_pte; | |
67 | pgprot_t kmap_prot; | |
68 | ||
69 | EXPORT_SYMBOL(kmap_prot); | |
70 | EXPORT_SYMBOL(kmap_pte); | |
71 | ||
72 | static inline pte_t *virt_to_kpte(unsigned long vaddr) | |
73 | { | |
74 | return pte_offset_kernel(pmd_offset(pud_offset(pgd_offset_k(vaddr), | |
75 | vaddr), vaddr), vaddr); | |
76 | } | |
77 | #endif | |
78 | ||
14cf11af PM |
79 | int page_is_ram(unsigned long pfn) |
80 | { | |
14cf11af | 81 | #ifndef CONFIG_PPC64 /* XXX for now */ |
a880e762 | 82 | return pfn < max_pfn; |
14cf11af | 83 | #else |
a880e762 | 84 | unsigned long paddr = (pfn << PAGE_SHIFT); |
28be7072 | 85 | struct memblock_region *reg; |
14cf11af | 86 | |
28be7072 BH |
87 | for_each_memblock(memory, reg) |
88 | if (paddr >= reg->base && paddr < (reg->base + reg->size)) | |
14cf11af | 89 | return 1; |
14cf11af PM |
90 | return 0; |
91 | #endif | |
92 | } | |
14cf11af | 93 | |
8b150478 | 94 | pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn, |
14cf11af PM |
95 | unsigned long size, pgprot_t vma_prot) |
96 | { | |
97 | if (ppc_md.phys_mem_access_prot) | |
8b150478 | 98 | return ppc_md.phys_mem_access_prot(file, pfn, size, vma_prot); |
14cf11af | 99 | |
8b150478 | 100 | if (!page_is_ram(pfn)) |
64b3d0e8 BH |
101 | vma_prot = pgprot_noncached(vma_prot); |
102 | ||
14cf11af PM |
103 | return vma_prot; |
104 | } | |
105 | EXPORT_SYMBOL(phys_mem_access_prot); | |
106 | ||
23fd0775 PM |
107 | #ifdef CONFIG_MEMORY_HOTPLUG |
108 | ||
bc02af93 YG |
109 | #ifdef CONFIG_NUMA |
110 | int memory_add_physaddr_to_nid(u64 start) | |
111 | { | |
112 | return hot_add_scn_to_nid(start); | |
113 | } | |
114 | #endif | |
115 | ||
fa90f70a | 116 | int arch_add_memory(int nid, u64 start, u64 size) |
23fd0775 | 117 | { |
237a0989 | 118 | struct pglist_data *pgdata; |
23fd0775 PM |
119 | struct zone *zone; |
120 | unsigned long start_pfn = start >> PAGE_SHIFT; | |
121 | unsigned long nr_pages = size >> PAGE_SHIFT; | |
122 | ||
237a0989 MK |
123 | pgdata = NODE_DATA(nid); |
124 | ||
2d0eee14 | 125 | start = (unsigned long)__va(start); |
54b79248 MK |
126 | create_section_mapping(start, start + size); |
127 | ||
23fd0775 PM |
128 | /* this should work for most non-highmem platforms */ |
129 | zone = pgdata->node_zones; | |
130 | ||
c04fc586 | 131 | return __add_pages(nid, zone, start_pfn, nr_pages); |
23fd0775 | 132 | } |
0d579944 | 133 | #endif /* CONFIG_MEMORY_HOTPLUG */ |
a99824f3 BP |
134 | |
135 | /* | |
136 | * walk_memory_resource() needs to make sure there is no holes in a given | |
9d88a2eb | 137 | * memory range. PPC64 does not maintain the memory layout in /proc/iomem. |
95f72d1e | 138 | * Instead it maintains it in memblock.memory structures. Walk through the |
9d88a2eb | 139 | * memory regions, find holes and callback for contiguous regions. |
a99824f3 BP |
140 | */ |
141 | int | |
908eedc6 KH |
142 | walk_system_ram_range(unsigned long start_pfn, unsigned long nr_pages, |
143 | void *arg, int (*func)(unsigned long, unsigned long, void *)) | |
a99824f3 | 144 | { |
28be7072 BH |
145 | struct memblock_region *reg; |
146 | unsigned long end_pfn = start_pfn + nr_pages; | |
147 | unsigned long tstart, tend; | |
9d88a2eb BP |
148 | int ret = -1; |
149 | ||
28be7072 | 150 | for_each_memblock(memory, reg) { |
c7fc2de0 YL |
151 | tstart = max(start_pfn, memblock_region_memory_base_pfn(reg)); |
152 | tend = min(end_pfn, memblock_region_memory_end_pfn(reg)); | |
28be7072 BH |
153 | if (tstart >= tend) |
154 | continue; | |
155 | ret = (*func)(tstart, tend - tstart, arg); | |
9d88a2eb BP |
156 | if (ret) |
157 | break; | |
9d88a2eb BP |
158 | } |
159 | return ret; | |
a99824f3 | 160 | } |
908eedc6 | 161 | EXPORT_SYMBOL_GPL(walk_system_ram_range); |
a99824f3 | 162 | |
7c8c6b97 PM |
163 | /* |
164 | * Initialize the bootmem system and give it all the memory we | |
165 | * have available. If we are using highmem, we only put the | |
166 | * lowmem into the bootmem system. | |
167 | */ | |
168 | #ifndef CONFIG_NEED_MULTIPLE_NODES | |
169 | void __init do_init_bootmem(void) | |
170 | { | |
7c8c6b97 PM |
171 | unsigned long start, bootmap_pages; |
172 | unsigned long total_pages; | |
28be7072 | 173 | struct memblock_region *reg; |
7c8c6b97 PM |
174 | int boot_mapsize; |
175 | ||
95f72d1e YL |
176 | max_low_pfn = max_pfn = memblock_end_of_DRAM() >> PAGE_SHIFT; |
177 | total_pages = (memblock_end_of_DRAM() - memstart_addr) >> PAGE_SHIFT; | |
7c8c6b97 PM |
178 | #ifdef CONFIG_HIGHMEM |
179 | total_pages = total_lowmem >> PAGE_SHIFT; | |
d7917ba7 | 180 | max_low_pfn = lowmem_end_addr >> PAGE_SHIFT; |
7c8c6b97 PM |
181 | #endif |
182 | ||
183 | /* | |
184 | * Find an area to use for the bootmem bitmap. Calculate the size of | |
185 | * bitmap required as (Total Memory) / PAGE_SIZE / BITS_PER_BYTE. | |
186 | * Add 1 additional page in case the address isn't page-aligned. | |
187 | */ | |
188 | bootmap_pages = bootmem_bootmap_pages(total_pages); | |
189 | ||
95f72d1e | 190 | start = memblock_alloc(bootmap_pages << PAGE_SHIFT, PAGE_SIZE); |
7c8c6b97 | 191 | |
37dd2bad KG |
192 | min_low_pfn = MEMORY_START >> PAGE_SHIFT; |
193 | boot_mapsize = init_bootmem_node(NODE_DATA(0), start >> PAGE_SHIFT, min_low_pfn, max_low_pfn); | |
7c8c6b97 | 194 | |
c67c3cb4 | 195 | /* Add active regions with valid PFNs */ |
28be7072 | 196 | for_each_memblock(memory, reg) { |
c67c3cb4 | 197 | unsigned long start_pfn, end_pfn; |
c7fc2de0 YL |
198 | start_pfn = memblock_region_memory_base_pfn(reg); |
199 | end_pfn = memblock_region_memory_end_pfn(reg); | |
c67c3cb4 MG |
200 | add_active_range(0, start_pfn, end_pfn); |
201 | } | |
202 | ||
7c8c6b97 PM |
203 | /* Add all physical memory to the bootmem map, mark each area |
204 | * present. | |
205 | */ | |
7c8c6b97 | 206 | #ifdef CONFIG_HIGHMEM |
d7917ba7 | 207 | free_bootmem_with_active_regions(0, lowmem_end_addr >> PAGE_SHIFT); |
f98eeb4e KG |
208 | |
209 | /* reserve the sections we're already using */ | |
28be7072 BH |
210 | for_each_memblock(reserved, reg) { |
211 | unsigned long top = reg->base + reg->size - 1; | |
212 | if (top < lowmem_end_addr) | |
213 | reserve_bootmem(reg->base, reg->size, BOOTMEM_DEFAULT); | |
214 | else if (reg->base < lowmem_end_addr) { | |
215 | unsigned long trunc_size = lowmem_end_addr - reg->base; | |
216 | reserve_bootmem(reg->base, trunc_size, BOOTMEM_DEFAULT); | |
f98eeb4e KG |
217 | } |
218 | } | |
c67c3cb4 MG |
219 | #else |
220 | free_bootmem_with_active_regions(0, max_pfn); | |
7c8c6b97 PM |
221 | |
222 | /* reserve the sections we're already using */ | |
28be7072 BH |
223 | for_each_memblock(reserved, reg) |
224 | reserve_bootmem(reg->base, reg->size, BOOTMEM_DEFAULT); | |
f98eeb4e | 225 | #endif |
7c8c6b97 | 226 | /* XXX need to clip this if using highmem? */ |
c67c3cb4 MG |
227 | sparse_memory_present_with_active_regions(0); |
228 | ||
7c8c6b97 PM |
229 | init_bootmem_done = 1; |
230 | } | |
231 | ||
4e8ad3e8 JB |
232 | /* mark pages that don't exist as nosave */ |
233 | static int __init mark_nonram_nosave(void) | |
234 | { | |
28be7072 BH |
235 | struct memblock_region *reg, *prev = NULL; |
236 | ||
237 | for_each_memblock(memory, reg) { | |
238 | if (prev && | |
c7fc2de0 YL |
239 | memblock_region_memory_end_pfn(prev) < memblock_region_memory_base_pfn(reg)) |
240 | register_nosave_region(memblock_region_memory_end_pfn(prev), | |
241 | memblock_region_memory_base_pfn(reg)); | |
28be7072 | 242 | prev = reg; |
4e8ad3e8 | 243 | } |
4e8ad3e8 JB |
244 | return 0; |
245 | } | |
246 | ||
7c8c6b97 PM |
247 | /* |
248 | * paging_init() sets up the page tables - in fact we've already done this. | |
249 | */ | |
250 | void __init paging_init(void) | |
251 | { | |
95f72d1e YL |
252 | unsigned long total_ram = memblock_phys_mem_size(); |
253 | phys_addr_t top_of_ram = memblock_end_of_DRAM(); | |
c67c3cb4 | 254 | unsigned long max_zone_pfns[MAX_NR_ZONES]; |
7c8c6b97 | 255 | |
2c419bde KG |
256 | #ifdef CONFIG_PPC32 |
257 | unsigned long v = __fix_to_virt(__end_of_fixed_addresses - 1); | |
258 | unsigned long end = __fix_to_virt(FIX_HOLE); | |
259 | ||
260 | for (; v < end; v += PAGE_SIZE) | |
261 | map_page(v, 0, 0); /* XXX gross */ | |
262 | #endif | |
263 | ||
7c8c6b97 PM |
264 | #ifdef CONFIG_HIGHMEM |
265 | map_page(PKMAP_BASE, 0, 0); /* XXX gross */ | |
2c419bde KG |
266 | pkmap_page_table = virt_to_kpte(PKMAP_BASE); |
267 | ||
268 | kmap_pte = virt_to_kpte(__fix_to_virt(FIX_KMAP_BEGIN)); | |
7c8c6b97 PM |
269 | kmap_prot = PAGE_KERNEL; |
270 | #endif /* CONFIG_HIGHMEM */ | |
271 | ||
2bf3016f | 272 | printk(KERN_DEBUG "Top of RAM: 0x%llx, Total RAM: 0x%lx\n", |
fb610635 | 273 | (unsigned long long)top_of_ram, total_ram); |
e110b281 | 274 | printk(KERN_DEBUG "Memory hole size: %ldMB\n", |
2bf3016f | 275 | (long int)((top_of_ram - total_ram) >> 20)); |
6391af17 | 276 | memset(max_zone_pfns, 0, sizeof(max_zone_pfns)); |
7c8c6b97 | 277 | #ifdef CONFIG_HIGHMEM |
d7917ba7 | 278 | max_zone_pfns[ZONE_DMA] = lowmem_end_addr >> PAGE_SHIFT; |
6391af17 | 279 | max_zone_pfns[ZONE_HIGHMEM] = top_of_ram >> PAGE_SHIFT; |
7c8c6b97 | 280 | #else |
6391af17 | 281 | max_zone_pfns[ZONE_DMA] = top_of_ram >> PAGE_SHIFT; |
c67c3cb4 MG |
282 | #endif |
283 | free_area_init_nodes(max_zone_pfns); | |
4e8ad3e8 JB |
284 | |
285 | mark_nonram_nosave(); | |
7c8c6b97 PM |
286 | } |
287 | #endif /* ! CONFIG_NEED_MULTIPLE_NODES */ | |
288 | ||
289 | void __init mem_init(void) | |
290 | { | |
291 | #ifdef CONFIG_NEED_MULTIPLE_NODES | |
292 | int nid; | |
293 | #endif | |
294 | pg_data_t *pgdat; | |
295 | unsigned long i; | |
296 | struct page *page; | |
297 | unsigned long reservedpages = 0, codesize, initsize, datasize, bsssize; | |
298 | ||
a9327296 FT |
299 | #ifdef CONFIG_SWIOTLB |
300 | if (ppc_swiotlb_enable) | |
301 | swiotlb_init(1); | |
302 | #endif | |
303 | ||
4734b594 | 304 | num_physpages = memblock_phys_mem_size() >> PAGE_SHIFT; |
7c8c6b97 PM |
305 | high_memory = (void *) __va(max_low_pfn * PAGE_SIZE); |
306 | ||
307 | #ifdef CONFIG_NEED_MULTIPLE_NODES | |
308 | for_each_online_node(nid) { | |
309 | if (NODE_DATA(nid)->node_spanned_pages != 0) { | |
c258dd40 | 310 | printk("freeing bootmem node %d\n", nid); |
7c8c6b97 PM |
311 | totalram_pages += |
312 | free_all_bootmem_node(NODE_DATA(nid)); | |
313 | } | |
314 | } | |
315 | #else | |
fb6d73d3 | 316 | max_mapnr = max_pfn; |
7c8c6b97 PM |
317 | totalram_pages += free_all_bootmem(); |
318 | #endif | |
ec936fc5 | 319 | for_each_online_pgdat(pgdat) { |
7c8c6b97 | 320 | for (i = 0; i < pgdat->node_spanned_pages; i++) { |
fb6d73d3 PM |
321 | if (!pfn_valid(pgdat->node_start_pfn + i)) |
322 | continue; | |
7c8c6b97 PM |
323 | page = pgdat_page_nr(pgdat, i); |
324 | if (PageReserved(page)) | |
325 | reservedpages++; | |
326 | } | |
327 | } | |
328 | ||
329 | codesize = (unsigned long)&_sdata - (unsigned long)&_stext; | |
bcb35576 | 330 | datasize = (unsigned long)&_edata - (unsigned long)&_sdata; |
7c8c6b97 PM |
331 | initsize = (unsigned long)&__init_end - (unsigned long)&__init_begin; |
332 | bsssize = (unsigned long)&__bss_stop - (unsigned long)&__bss_start; | |
333 | ||
334 | #ifdef CONFIG_HIGHMEM | |
335 | { | |
336 | unsigned long pfn, highmem_mapnr; | |
337 | ||
d7917ba7 | 338 | highmem_mapnr = lowmem_end_addr >> PAGE_SHIFT; |
7c8c6b97 PM |
339 | for (pfn = highmem_mapnr; pfn < max_mapnr; ++pfn) { |
340 | struct page *page = pfn_to_page(pfn); | |
95f72d1e | 341 | if (memblock_is_reserved(pfn << PAGE_SHIFT)) |
f98eeb4e | 342 | continue; |
7c8c6b97 | 343 | ClearPageReserved(page); |
7835e98b | 344 | init_page_count(page); |
7c8c6b97 PM |
345 | __free_page(page); |
346 | totalhigh_pages++; | |
f98eeb4e | 347 | reservedpages--; |
7c8c6b97 PM |
348 | } |
349 | totalram_pages += totalhigh_pages; | |
e110b281 | 350 | printk(KERN_DEBUG "High memory: %luk\n", |
7c8c6b97 PM |
351 | totalhigh_pages << (PAGE_SHIFT-10)); |
352 | } | |
353 | #endif /* CONFIG_HIGHMEM */ | |
354 | ||
355 | printk(KERN_INFO "Memory: %luk/%luk available (%luk kernel code, " | |
356 | "%luk reserved, %luk data, %luk bss, %luk init)\n", | |
cc013a88 | 357 | nr_free_pages() << (PAGE_SHIFT-10), |
7c8c6b97 PM |
358 | num_physpages << (PAGE_SHIFT-10), |
359 | codesize >> 10, | |
360 | reservedpages << (PAGE_SHIFT-10), | |
361 | datasize >> 10, | |
362 | bsssize >> 10, | |
363 | initsize >> 10); | |
364 | ||
f637a49e BH |
365 | #ifdef CONFIG_PPC32 |
366 | pr_info("Kernel virtual memory layout:\n"); | |
367 | pr_info(" * 0x%08lx..0x%08lx : fixmap\n", FIXADDR_START, FIXADDR_TOP); | |
368 | #ifdef CONFIG_HIGHMEM | |
369 | pr_info(" * 0x%08lx..0x%08lx : highmem PTEs\n", | |
370 | PKMAP_BASE, PKMAP_ADDR(LAST_PKMAP)); | |
371 | #endif /* CONFIG_HIGHMEM */ | |
8b31e49d BH |
372 | #ifdef CONFIG_NOT_COHERENT_CACHE |
373 | pr_info(" * 0x%08lx..0x%08lx : consistent mem\n", | |
374 | IOREMAP_TOP, IOREMAP_TOP + CONFIG_CONSISTENT_SIZE); | |
375 | #endif /* CONFIG_NOT_COHERENT_CACHE */ | |
f637a49e BH |
376 | pr_info(" * 0x%08lx..0x%08lx : early ioremap\n", |
377 | ioremap_bot, IOREMAP_TOP); | |
378 | pr_info(" * 0x%08lx..0x%08lx : vmalloc & ioremap\n", | |
379 | VMALLOC_START, VMALLOC_END); | |
380 | #endif /* CONFIG_PPC32 */ | |
381 | ||
7c8c6b97 | 382 | mem_init_done = 1; |
7c8c6b97 PM |
383 | } |
384 | ||
14cf11af PM |
385 | /* |
386 | * This is called when a page has been modified by the kernel. | |
387 | * It just marks the page as not i-cache clean. We do the i-cache | |
388 | * flush later when the page is given to a user process, if necessary. | |
389 | */ | |
390 | void flush_dcache_page(struct page *page) | |
391 | { | |
392 | if (cpu_has_feature(CPU_FTR_COHERENT_ICACHE)) | |
393 | return; | |
394 | /* avoid an atomic op if possible */ | |
395 | if (test_bit(PG_arch_1, &page->flags)) | |
396 | clear_bit(PG_arch_1, &page->flags); | |
397 | } | |
398 | EXPORT_SYMBOL(flush_dcache_page); | |
399 | ||
400 | void flush_dcache_icache_page(struct page *page) | |
401 | { | |
0895ecda DG |
402 | #ifdef CONFIG_HUGETLB_PAGE |
403 | if (PageCompound(page)) { | |
404 | flush_dcache_icache_hugepage(page); | |
405 | return; | |
406 | } | |
407 | #endif | |
14cf11af | 408 | #ifdef CONFIG_BOOKE |
0895ecda DG |
409 | { |
410 | void *start = kmap_atomic(page, KM_PPC_SYNC_ICACHE); | |
411 | __flush_dcache_icache(start); | |
412 | kunmap_atomic(start, KM_PPC_SYNC_ICACHE); | |
413 | } | |
ab1f9dac | 414 | #elif defined(CONFIG_8xx) || defined(CONFIG_PPC64) |
14cf11af PM |
415 | /* On 8xx there is no need to kmap since highmem is not supported */ |
416 | __flush_dcache_icache(page_address(page)); | |
417 | #else | |
418 | __flush_dcache_icache_phys(page_to_pfn(page) << PAGE_SHIFT); | |
419 | #endif | |
14cf11af | 420 | } |
0895ecda | 421 | |
14cf11af PM |
422 | void clear_user_page(void *page, unsigned long vaddr, struct page *pg) |
423 | { | |
424 | clear_page(page); | |
425 | ||
14cf11af | 426 | /* |
25985edc | 427 | * We shouldn't have to do this, but some versions of glibc |
14cf11af PM |
428 | * require it (ld.so assumes zero filled pages are icache clean) |
429 | * - Anton | |
430 | */ | |
09f5dc44 | 431 | flush_dcache_page(pg); |
14cf11af PM |
432 | } |
433 | EXPORT_SYMBOL(clear_user_page); | |
434 | ||
435 | void copy_user_page(void *vto, void *vfrom, unsigned long vaddr, | |
436 | struct page *pg) | |
437 | { | |
438 | copy_page(vto, vfrom); | |
439 | ||
440 | /* | |
441 | * We should be able to use the following optimisation, however | |
442 | * there are two problems. | |
443 | * Firstly a bug in some versions of binutils meant PLT sections | |
444 | * were not marked executable. | |
445 | * Secondly the first word in the GOT section is blrl, used | |
446 | * to establish the GOT address. Until recently the GOT was | |
447 | * not marked executable. | |
448 | * - Anton | |
449 | */ | |
450 | #if 0 | |
451 | if (!vma->vm_file && ((vma->vm_flags & VM_EXEC) == 0)) | |
452 | return; | |
453 | #endif | |
454 | ||
09f5dc44 | 455 | flush_dcache_page(pg); |
14cf11af PM |
456 | } |
457 | ||
458 | void flush_icache_user_range(struct vm_area_struct *vma, struct page *page, | |
459 | unsigned long addr, int len) | |
460 | { | |
461 | unsigned long maddr; | |
462 | ||
463 | maddr = (unsigned long) kmap(page) + (addr & ~PAGE_MASK); | |
464 | flush_icache_range(maddr, maddr + len); | |
465 | kunmap(page); | |
466 | } | |
467 | EXPORT_SYMBOL(flush_icache_user_range); | |
468 | ||
469 | /* | |
470 | * This is called at the end of handling a user page fault, when the | |
471 | * fault has been handled by updating a PTE in the linux page tables. | |
472 | * We use it to preload an HPTE into the hash table corresponding to | |
473 | * the updated linux PTE. | |
474 | * | |
01edcd89 | 475 | * This must always be called with the pte lock held. |
14cf11af PM |
476 | */ |
477 | void update_mmu_cache(struct vm_area_struct *vma, unsigned long address, | |
4b3073e1 | 478 | pte_t *ptep) |
14cf11af | 479 | { |
3c726f8d BH |
480 | #ifdef CONFIG_PPC_STD_MMU |
481 | unsigned long access = 0, trap; | |
14cf11af | 482 | |
14cf11af | 483 | /* We only want HPTEs for linux PTEs that have _PAGE_ACCESSED set */ |
4b3073e1 | 484 | if (!pte_young(*ptep) || address >= TASK_SIZE) |
14cf11af | 485 | return; |
14cf11af | 486 | |
3c726f8d BH |
487 | /* We try to figure out if we are coming from an instruction |
488 | * access fault and pass that down to __hash_page so we avoid | |
489 | * double-faulting on execution of fresh text. We have to test | |
490 | * for regs NULL since init will get here first thing at boot | |
491 | * | |
492 | * We also avoid filling the hash if not coming from a fault | |
493 | */ | |
494 | if (current->thread.regs == NULL) | |
14cf11af | 495 | return; |
3c726f8d BH |
496 | trap = TRAP(current->thread.regs); |
497 | if (trap == 0x400) | |
498 | access |= _PAGE_EXEC; | |
499 | else if (trap != 0x300) | |
500 | return; | |
501 | hash_preload(vma->vm_mm, address, access, trap); | |
502 | #endif /* CONFIG_PPC_STD_MMU */ | |
14cf11af | 503 | } |