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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 | ||
4b16f8e2 | 20 | #include <linux/export.h> |
14cf11af PM |
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> |
c40dd2f7 | 37 | #include <linux/slab.h> |
16d0f5c4 | 38 | #include <linux/vmalloc.h> |
14cf11af PM |
39 | |
40 | #include <asm/pgalloc.h> | |
41 | #include <asm/prom.h> | |
42 | #include <asm/io.h> | |
43 | #include <asm/mmu_context.h> | |
44 | #include <asm/pgtable.h> | |
45 | #include <asm/mmu.h> | |
46 | #include <asm/smp.h> | |
47 | #include <asm/machdep.h> | |
48 | #include <asm/btext.h> | |
49 | #include <asm/tlb.h> | |
7c8c6b97 | 50 | #include <asm/sections.h> |
db7f37de | 51 | #include <asm/sparsemem.h> |
ab1f9dac | 52 | #include <asm/vdso.h> |
2c419bde | 53 | #include <asm/fixmap.h> |
a9327296 | 54 | #include <asm/swiotlb.h> |
8a3e3d31 | 55 | #include <asm/rtas.h> |
14cf11af | 56 | |
14cf11af PM |
57 | #include "mmu_decl.h" |
58 | ||
59 | #ifndef CPU_FTR_COHERENT_ICACHE | |
60 | #define CPU_FTR_COHERENT_ICACHE 0 /* XXX for now */ | |
61 | #define CPU_FTR_NOEXECUTE 0 | |
62 | #endif | |
63 | ||
a84fcd46 | 64 | unsigned long long memory_limit; |
7c8c6b97 | 65 | |
2c419bde KG |
66 | #ifdef CONFIG_HIGHMEM |
67 | pte_t *kmap_pte; | |
8040bda3 | 68 | EXPORT_SYMBOL(kmap_pte); |
2c419bde | 69 | pgprot_t kmap_prot; |
2c419bde | 70 | EXPORT_SYMBOL(kmap_prot); |
2c419bde KG |
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 | ||
033fbae9 | 116 | int arch_add_memory(int nid, u64 start, u64 size, bool for_device) |
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; | |
1dace6c6 | 122 | int rc; |
23fd0775 | 123 | |
237a0989 MK |
124 | pgdata = NODE_DATA(nid); |
125 | ||
2d0eee14 | 126 | start = (unsigned long)__va(start); |
1dace6c6 DG |
127 | rc = create_section_mapping(start, start + size); |
128 | if (rc) { | |
129 | pr_warning( | |
130 | "Unable to create mapping for hot added memory 0x%llx..0x%llx: %d\n", | |
131 | start, start + size, rc); | |
132 | return -EFAULT; | |
133 | } | |
54b79248 | 134 | |
23fd0775 | 135 | /* this should work for most non-highmem platforms */ |
f51202de | 136 | zone = pgdata->node_zones + |
033fbae9 | 137 | zone_for_memory(nid, start, size, 0, for_device); |
23fd0775 | 138 | |
c04fc586 | 139 | return __add_pages(nid, zone, start_pfn, nr_pages); |
23fd0775 | 140 | } |
24d335ca WC |
141 | |
142 | #ifdef CONFIG_MEMORY_HOTREMOVE | |
143 | int arch_remove_memory(u64 start, u64 size) | |
144 | { | |
145 | unsigned long start_pfn = start >> PAGE_SHIFT; | |
146 | unsigned long nr_pages = size >> PAGE_SHIFT; | |
147 | struct zone *zone; | |
9ac8cde9 | 148 | int ret; |
24d335ca WC |
149 | |
150 | zone = page_zone(pfn_to_page(start_pfn)); | |
9ac8cde9 | 151 | ret = __remove_pages(zone, start_pfn, nr_pages); |
16d0f5c4 AB |
152 | if (ret) |
153 | return ret; | |
154 | ||
155 | /* Remove htab bolted mappings for this section of memory */ | |
156 | start = (unsigned long)__va(start); | |
157 | ret = remove_section_mapping(start, start + size); | |
158 | ||
159 | /* Ensure all vmalloc mappings are flushed in case they also | |
160 | * hit that section of memory | |
161 | */ | |
162 | vm_unmap_aliases(); | |
9ac8cde9 NF |
163 | |
164 | return ret; | |
24d335ca WC |
165 | } |
166 | #endif | |
0d579944 | 167 | #endif /* CONFIG_MEMORY_HOTPLUG */ |
a99824f3 BP |
168 | |
169 | /* | |
170 | * walk_memory_resource() needs to make sure there is no holes in a given | |
9d88a2eb | 171 | * memory range. PPC64 does not maintain the memory layout in /proc/iomem. |
95f72d1e | 172 | * Instead it maintains it in memblock.memory structures. Walk through the |
9d88a2eb | 173 | * memory regions, find holes and callback for contiguous regions. |
a99824f3 BP |
174 | */ |
175 | int | |
908eedc6 KH |
176 | walk_system_ram_range(unsigned long start_pfn, unsigned long nr_pages, |
177 | void *arg, int (*func)(unsigned long, unsigned long, void *)) | |
a99824f3 | 178 | { |
28be7072 BH |
179 | struct memblock_region *reg; |
180 | unsigned long end_pfn = start_pfn + nr_pages; | |
181 | unsigned long tstart, tend; | |
9d88a2eb BP |
182 | int ret = -1; |
183 | ||
28be7072 | 184 | for_each_memblock(memory, reg) { |
c7fc2de0 YL |
185 | tstart = max(start_pfn, memblock_region_memory_base_pfn(reg)); |
186 | tend = min(end_pfn, memblock_region_memory_end_pfn(reg)); | |
28be7072 BH |
187 | if (tstart >= tend) |
188 | continue; | |
189 | ret = (*func)(tstart, tend - tstart, arg); | |
9d88a2eb BP |
190 | if (ret) |
191 | break; | |
9d88a2eb BP |
192 | } |
193 | return ret; | |
a99824f3 | 194 | } |
908eedc6 | 195 | EXPORT_SYMBOL_GPL(walk_system_ram_range); |
a99824f3 | 196 | |
7c8c6b97 | 197 | #ifndef CONFIG_NEED_MULTIPLE_NODES |
10239733 | 198 | void __init initmem_init(void) |
7c8c6b97 | 199 | { |
95f72d1e | 200 | max_low_pfn = max_pfn = memblock_end_of_DRAM() >> PAGE_SHIFT; |
10239733 | 201 | min_low_pfn = MEMORY_START >> PAGE_SHIFT; |
7c8c6b97 | 202 | #ifdef CONFIG_HIGHMEM |
d7917ba7 | 203 | max_low_pfn = lowmem_end_addr >> PAGE_SHIFT; |
7c8c6b97 PM |
204 | #endif |
205 | ||
4e8309ba CS |
206 | /* Place all memblock_regions in the same node and merge contiguous |
207 | * memblock_regions | |
208 | */ | |
e7e8de59 | 209 | memblock_set_node(0, (phys_addr_t)ULLONG_MAX, &memblock.memory, 0); |
c67c3cb4 | 210 | |
7c8c6b97 | 211 | /* XXX need to clip this if using highmem? */ |
c67c3cb4 | 212 | sparse_memory_present_with_active_regions(0); |
21098b9e | 213 | sparse_init(); |
7c8c6b97 PM |
214 | } |
215 | ||
4e8ad3e8 JB |
216 | /* mark pages that don't exist as nosave */ |
217 | static int __init mark_nonram_nosave(void) | |
218 | { | |
28be7072 BH |
219 | struct memblock_region *reg, *prev = NULL; |
220 | ||
221 | for_each_memblock(memory, reg) { | |
222 | if (prev && | |
c7fc2de0 YL |
223 | memblock_region_memory_end_pfn(prev) < memblock_region_memory_base_pfn(reg)) |
224 | register_nosave_region(memblock_region_memory_end_pfn(prev), | |
225 | memblock_region_memory_base_pfn(reg)); | |
28be7072 | 226 | prev = reg; |
4e8ad3e8 | 227 | } |
4e8ad3e8 JB |
228 | return 0; |
229 | } | |
6db35ad2 SW |
230 | #else /* CONFIG_NEED_MULTIPLE_NODES */ |
231 | static int __init mark_nonram_nosave(void) | |
232 | { | |
233 | return 0; | |
234 | } | |
235 | #endif | |
4e8ad3e8 | 236 | |
1c98025c SW |
237 | static bool zone_limits_final; |
238 | ||
239 | static unsigned long max_zone_pfns[MAX_NR_ZONES] = { | |
240 | [0 ... MAX_NR_ZONES - 1] = ~0UL | |
241 | }; | |
242 | ||
243 | /* | |
244 | * Restrict the specified zone and all more restrictive zones | |
245 | * to be below the specified pfn. May not be called after | |
246 | * paging_init(). | |
247 | */ | |
248 | void __init limit_zone_pfn(enum zone_type zone, unsigned long pfn_limit) | |
249 | { | |
250 | int i; | |
251 | ||
252 | if (WARN_ON(zone_limits_final)) | |
253 | return; | |
254 | ||
255 | for (i = zone; i >= 0; i--) { | |
256 | if (max_zone_pfns[i] > pfn_limit) | |
257 | max_zone_pfns[i] = pfn_limit; | |
258 | } | |
259 | } | |
260 | ||
261 | /* | |
262 | * Find the least restrictive zone that is entirely below the | |
263 | * specified pfn limit. Returns < 0 if no suitable zone is found. | |
264 | * | |
265 | * pfn_limit must be u64 because it can exceed 32 bits even on 32-bit | |
266 | * systems -- the DMA limit can be higher than any possible real pfn. | |
267 | */ | |
268 | int dma_pfn_limit_to_zone(u64 pfn_limit) | |
269 | { | |
270 | enum zone_type top_zone = ZONE_NORMAL; | |
271 | int i; | |
272 | ||
273 | #ifdef CONFIG_HIGHMEM | |
274 | top_zone = ZONE_HIGHMEM; | |
275 | #endif | |
276 | ||
277 | for (i = top_zone; i >= 0; i--) { | |
278 | if (max_zone_pfns[i] <= pfn_limit) | |
279 | return i; | |
280 | } | |
281 | ||
282 | return -EPERM; | |
283 | } | |
4e8ad3e8 | 284 | |
7c8c6b97 PM |
285 | /* |
286 | * paging_init() sets up the page tables - in fact we've already done this. | |
287 | */ | |
288 | void __init paging_init(void) | |
289 | { | |
f7ba2991 | 290 | unsigned long long total_ram = memblock_phys_mem_size(); |
95f72d1e | 291 | phys_addr_t top_of_ram = memblock_end_of_DRAM(); |
1c98025c | 292 | enum zone_type top_zone; |
7c8c6b97 | 293 | |
2c419bde KG |
294 | #ifdef CONFIG_PPC32 |
295 | unsigned long v = __fix_to_virt(__end_of_fixed_addresses - 1); | |
296 | unsigned long end = __fix_to_virt(FIX_HOLE); | |
297 | ||
298 | for (; v < end; v += PAGE_SIZE) | |
299 | map_page(v, 0, 0); /* XXX gross */ | |
300 | #endif | |
301 | ||
7c8c6b97 PM |
302 | #ifdef CONFIG_HIGHMEM |
303 | map_page(PKMAP_BASE, 0, 0); /* XXX gross */ | |
2c419bde KG |
304 | pkmap_page_table = virt_to_kpte(PKMAP_BASE); |
305 | ||
306 | kmap_pte = virt_to_kpte(__fix_to_virt(FIX_KMAP_BEGIN)); | |
7c8c6b97 PM |
307 | kmap_prot = PAGE_KERNEL; |
308 | #endif /* CONFIG_HIGHMEM */ | |
309 | ||
f7ba2991 | 310 | printk(KERN_DEBUG "Top of RAM: 0x%llx, Total RAM: 0x%llx\n", |
fb610635 | 311 | (unsigned long long)top_of_ram, total_ram); |
e110b281 | 312 | printk(KERN_DEBUG "Memory hole size: %ldMB\n", |
2bf3016f | 313 | (long int)((top_of_ram - total_ram) >> 20)); |
1c98025c | 314 | |
7c8c6b97 | 315 | #ifdef CONFIG_HIGHMEM |
1c98025c SW |
316 | top_zone = ZONE_HIGHMEM; |
317 | limit_zone_pfn(ZONE_NORMAL, lowmem_end_addr >> PAGE_SHIFT); | |
7c8c6b97 | 318 | #else |
1c98025c | 319 | top_zone = ZONE_NORMAL; |
c67c3cb4 | 320 | #endif |
1c98025c SW |
321 | |
322 | limit_zone_pfn(top_zone, top_of_ram >> PAGE_SHIFT); | |
323 | zone_limits_final = true; | |
c67c3cb4 | 324 | free_area_init_nodes(max_zone_pfns); |
4e8ad3e8 JB |
325 | |
326 | mark_nonram_nosave(); | |
7c8c6b97 | 327 | } |
7c8c6b97 PM |
328 | |
329 | void __init mem_init(void) | |
330 | { | |
28efc35f SW |
331 | /* |
332 | * book3s is limited to 16 page sizes due to encoding this in | |
333 | * a 4-bit field for slices. | |
334 | */ | |
335 | BUILD_BUG_ON(MMU_PAGE_COUNT > 16); | |
336 | ||
a9327296 | 337 | #ifdef CONFIG_SWIOTLB |
688ba1db | 338 | swiotlb_init(0); |
a9327296 FT |
339 | #endif |
340 | ||
7c8c6b97 | 341 | high_memory = (void *) __va(max_low_pfn * PAGE_SIZE); |
602ddc70 | 342 | set_max_mapnr(max_pfn); |
0c988534 | 343 | free_all_bootmem(); |
7c8c6b97 PM |
344 | |
345 | #ifdef CONFIG_HIGHMEM | |
346 | { | |
347 | unsigned long pfn, highmem_mapnr; | |
348 | ||
d7917ba7 | 349 | highmem_mapnr = lowmem_end_addr >> PAGE_SHIFT; |
7c8c6b97 | 350 | for (pfn = highmem_mapnr; pfn < max_mapnr; ++pfn) { |
3d41e0f6 | 351 | phys_addr_t paddr = (phys_addr_t)pfn << PAGE_SHIFT; |
7c8c6b97 | 352 | struct page *page = pfn_to_page(pfn); |
369a9d85 JL |
353 | if (!memblock_is_reserved(paddr)) |
354 | free_highmem_page(page); | |
7c8c6b97 | 355 | } |
7c8c6b97 PM |
356 | } |
357 | #endif /* CONFIG_HIGHMEM */ | |
358 | ||
3160b097 BB |
359 | #if defined(CONFIG_PPC_FSL_BOOK3E) && !defined(CONFIG_SMP) |
360 | /* | |
361 | * If smp is enabled, next_tlbcam_idx is initialized in the cpu up | |
362 | * functions.... do it here for the non-smp case. | |
363 | */ | |
364 | per_cpu(next_tlbcam_idx, smp_processor_id()) = | |
365 | (mfspr(SPRN_TLB1CFG) & TLBnCFG_N_ENTRY) - 1; | |
366 | #endif | |
367 | ||
369a9d85 | 368 | mem_init_print_info(NULL); |
f637a49e BH |
369 | #ifdef CONFIG_PPC32 |
370 | pr_info("Kernel virtual memory layout:\n"); | |
371 | pr_info(" * 0x%08lx..0x%08lx : fixmap\n", FIXADDR_START, FIXADDR_TOP); | |
372 | #ifdef CONFIG_HIGHMEM | |
373 | pr_info(" * 0x%08lx..0x%08lx : highmem PTEs\n", | |
374 | PKMAP_BASE, PKMAP_ADDR(LAST_PKMAP)); | |
375 | #endif /* CONFIG_HIGHMEM */ | |
8b31e49d BH |
376 | #ifdef CONFIG_NOT_COHERENT_CACHE |
377 | pr_info(" * 0x%08lx..0x%08lx : consistent mem\n", | |
378 | IOREMAP_TOP, IOREMAP_TOP + CONFIG_CONSISTENT_SIZE); | |
379 | #endif /* CONFIG_NOT_COHERENT_CACHE */ | |
f637a49e BH |
380 | pr_info(" * 0x%08lx..0x%08lx : early ioremap\n", |
381 | ioremap_bot, IOREMAP_TOP); | |
382 | pr_info(" * 0x%08lx..0x%08lx : vmalloc & ioremap\n", | |
383 | VMALLOC_START, VMALLOC_END); | |
384 | #endif /* CONFIG_PPC32 */ | |
7c8c6b97 PM |
385 | } |
386 | ||
2773fcc8 DC |
387 | void free_initmem(void) |
388 | { | |
a9c0f41b | 389 | ppc_md.progress = ppc_printk_progress; |
5d585e5c | 390 | free_initmem_default(POISON_FREE_INITMEM); |
2773fcc8 DC |
391 | } |
392 | ||
307cfe71 BH |
393 | #ifdef CONFIG_BLK_DEV_INITRD |
394 | void __init free_initrd_mem(unsigned long start, unsigned long end) | |
395 | { | |
dbe67df4 | 396 | free_reserved_area((void *)start, (void *)end, -1, "initrd"); |
307cfe71 BH |
397 | } |
398 | #endif | |
399 | ||
14cf11af PM |
400 | /* |
401 | * This is called when a page has been modified by the kernel. | |
402 | * It just marks the page as not i-cache clean. We do the i-cache | |
403 | * flush later when the page is given to a user process, if necessary. | |
404 | */ | |
405 | void flush_dcache_page(struct page *page) | |
406 | { | |
407 | if (cpu_has_feature(CPU_FTR_COHERENT_ICACHE)) | |
408 | return; | |
409 | /* avoid an atomic op if possible */ | |
410 | if (test_bit(PG_arch_1, &page->flags)) | |
411 | clear_bit(PG_arch_1, &page->flags); | |
412 | } | |
413 | EXPORT_SYMBOL(flush_dcache_page); | |
414 | ||
415 | void flush_dcache_icache_page(struct page *page) | |
416 | { | |
0895ecda DG |
417 | #ifdef CONFIG_HUGETLB_PAGE |
418 | if (PageCompound(page)) { | |
419 | flush_dcache_icache_hugepage(page); | |
420 | return; | |
421 | } | |
422 | #endif | |
2f7d2b74 SW |
423 | #if defined(CONFIG_8xx) || defined(CONFIG_PPC64) |
424 | /* On 8xx there is no need to kmap since highmem is not supported */ | |
425 | __flush_dcache_icache(page_address(page)); | |
426 | #else | |
427 | if (IS_ENABLED(CONFIG_BOOKE) || sizeof(phys_addr_t) > sizeof(void *)) { | |
2480b208 | 428 | void *start = kmap_atomic(page); |
0895ecda | 429 | __flush_dcache_icache(start); |
2480b208 | 430 | kunmap_atomic(start); |
2f7d2b74 SW |
431 | } else { |
432 | __flush_dcache_icache_phys(page_to_pfn(page) << PAGE_SHIFT); | |
0895ecda | 433 | } |
14cf11af | 434 | #endif |
14cf11af | 435 | } |
249ba1ee | 436 | EXPORT_SYMBOL(flush_dcache_icache_page); |
0895ecda | 437 | |
14cf11af PM |
438 | void clear_user_page(void *page, unsigned long vaddr, struct page *pg) |
439 | { | |
440 | clear_page(page); | |
441 | ||
14cf11af | 442 | /* |
25985edc | 443 | * We shouldn't have to do this, but some versions of glibc |
14cf11af PM |
444 | * require it (ld.so assumes zero filled pages are icache clean) |
445 | * - Anton | |
446 | */ | |
09f5dc44 | 447 | flush_dcache_page(pg); |
14cf11af PM |
448 | } |
449 | EXPORT_SYMBOL(clear_user_page); | |
450 | ||
451 | void copy_user_page(void *vto, void *vfrom, unsigned long vaddr, | |
452 | struct page *pg) | |
453 | { | |
454 | copy_page(vto, vfrom); | |
455 | ||
456 | /* | |
457 | * We should be able to use the following optimisation, however | |
458 | * there are two problems. | |
459 | * Firstly a bug in some versions of binutils meant PLT sections | |
460 | * were not marked executable. | |
461 | * Secondly the first word in the GOT section is blrl, used | |
462 | * to establish the GOT address. Until recently the GOT was | |
463 | * not marked executable. | |
464 | * - Anton | |
465 | */ | |
466 | #if 0 | |
467 | if (!vma->vm_file && ((vma->vm_flags & VM_EXEC) == 0)) | |
468 | return; | |
469 | #endif | |
470 | ||
09f5dc44 | 471 | flush_dcache_page(pg); |
14cf11af PM |
472 | } |
473 | ||
474 | void flush_icache_user_range(struct vm_area_struct *vma, struct page *page, | |
475 | unsigned long addr, int len) | |
476 | { | |
477 | unsigned long maddr; | |
478 | ||
479 | maddr = (unsigned long) kmap(page) + (addr & ~PAGE_MASK); | |
480 | flush_icache_range(maddr, maddr + len); | |
481 | kunmap(page); | |
482 | } | |
483 | EXPORT_SYMBOL(flush_icache_user_range); | |
484 | ||
485 | /* | |
486 | * This is called at the end of handling a user page fault, when the | |
487 | * fault has been handled by updating a PTE in the linux page tables. | |
488 | * We use it to preload an HPTE into the hash table corresponding to | |
489 | * the updated linux PTE. | |
490 | * | |
01edcd89 | 491 | * This must always be called with the pte lock held. |
14cf11af PM |
492 | */ |
493 | void update_mmu_cache(struct vm_area_struct *vma, unsigned long address, | |
4b3073e1 | 494 | pte_t *ptep) |
14cf11af | 495 | { |
3c726f8d | 496 | #ifdef CONFIG_PPC_STD_MMU |
0ac52dd7 AK |
497 | /* |
498 | * We don't need to worry about _PAGE_PRESENT here because we are | |
499 | * called with either mm->page_table_lock held or ptl lock held | |
500 | */ | |
3c726f8d | 501 | unsigned long access = 0, trap; |
14cf11af | 502 | |
14cf11af | 503 | /* We only want HPTEs for linux PTEs that have _PAGE_ACCESSED set */ |
4b3073e1 | 504 | if (!pte_young(*ptep) || address >= TASK_SIZE) |
14cf11af | 505 | return; |
14cf11af | 506 | |
3c726f8d BH |
507 | /* We try to figure out if we are coming from an instruction |
508 | * access fault and pass that down to __hash_page so we avoid | |
509 | * double-faulting on execution of fresh text. We have to test | |
510 | * for regs NULL since init will get here first thing at boot | |
511 | * | |
512 | * We also avoid filling the hash if not coming from a fault | |
513 | */ | |
514 | if (current->thread.regs == NULL) | |
14cf11af | 515 | return; |
3c726f8d BH |
516 | trap = TRAP(current->thread.regs); |
517 | if (trap == 0x400) | |
518 | access |= _PAGE_EXEC; | |
519 | else if (trap != 0x300) | |
520 | return; | |
521 | hash_preload(vma->vm_mm, address, access, trap); | |
522 | #endif /* CONFIG_PPC_STD_MMU */ | |
41151e77 BB |
523 | #if (defined(CONFIG_PPC_BOOK3E_64) || defined(CONFIG_PPC_FSL_BOOK3E)) \ |
524 | && defined(CONFIG_HUGETLB_PAGE) | |
525 | if (is_vm_hugetlb_page(vma)) | |
d93e4d7d | 526 | book3e_hugetlb_preload(vma, address, *ptep); |
41151e77 | 527 | #endif |
14cf11af | 528 | } |
c40dd2f7 AB |
529 | |
530 | /* | |
531 | * System memory should not be in /proc/iomem but various tools expect it | |
532 | * (eg kdump). | |
533 | */ | |
4f770924 | 534 | static int __init add_system_ram_resources(void) |
c40dd2f7 AB |
535 | { |
536 | struct memblock_region *reg; | |
537 | ||
538 | for_each_memblock(memory, reg) { | |
539 | struct resource *res; | |
540 | unsigned long base = reg->base; | |
541 | unsigned long size = reg->size; | |
542 | ||
543 | res = kzalloc(sizeof(struct resource), GFP_KERNEL); | |
544 | WARN_ON(!res); | |
545 | ||
546 | if (res) { | |
547 | res->name = "System RAM"; | |
548 | res->start = base; | |
549 | res->end = base + size - 1; | |
35d98e93 | 550 | res->flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY; |
c40dd2f7 AB |
551 | WARN_ON(request_resource(&iomem_resource, res) < 0); |
552 | } | |
553 | } | |
554 | ||
555 | return 0; | |
556 | } | |
557 | subsys_initcall(add_system_ram_resources); | |
1d54cf2b | 558 | |
559 | #ifdef CONFIG_STRICT_DEVMEM | |
560 | /* | |
561 | * devmem_is_allowed(): check to see if /dev/mem access to a certain address | |
562 | * is valid. The argument is a physical page number. | |
563 | * | |
564 | * Access has to be given to non-kernel-ram areas as well, these contain the | |
565 | * PCI mmio resources as well as potential bios/acpi data regions. | |
566 | */ | |
567 | int devmem_is_allowed(unsigned long pfn) | |
568 | { | |
e256caa7 VH |
569 | if (page_is_rtas_user_buf(pfn)) |
570 | return 1; | |
6c0cc627 | 571 | if (iomem_is_exclusive(PFN_PHYS(pfn))) |
1d54cf2b | 572 | return 0; |
573 | if (!page_is_ram(pfn)) | |
574 | return 1; | |
575 | return 0; | |
576 | } | |
577 | #endif /* CONFIG_STRICT_DEVMEM */ |