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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> |
14cf11af PM |
38 | |
39 | #include <asm/pgalloc.h> | |
40 | #include <asm/prom.h> | |
41 | #include <asm/io.h> | |
42 | #include <asm/mmu_context.h> | |
43 | #include <asm/pgtable.h> | |
44 | #include <asm/mmu.h> | |
45 | #include <asm/smp.h> | |
46 | #include <asm/machdep.h> | |
47 | #include <asm/btext.h> | |
48 | #include <asm/tlb.h> | |
7c8c6b97 | 49 | #include <asm/sections.h> |
db7f37de | 50 | #include <asm/sparsemem.h> |
ab1f9dac | 51 | #include <asm/vdso.h> |
2c419bde | 52 | #include <asm/fixmap.h> |
a9327296 | 53 | #include <asm/swiotlb.h> |
8a3e3d31 | 54 | #include <asm/rtas.h> |
14cf11af | 55 | |
14cf11af PM |
56 | #include "mmu_decl.h" |
57 | ||
58 | #ifndef CPU_FTR_COHERENT_ICACHE | |
59 | #define CPU_FTR_COHERENT_ICACHE 0 /* XXX for now */ | |
60 | #define CPU_FTR_NOEXECUTE 0 | |
61 | #endif | |
62 | ||
7c8c6b97 PM |
63 | int init_bootmem_done; |
64 | int mem_init_done; | |
a84fcd46 | 65 | unsigned long long memory_limit; |
7c8c6b97 | 66 | |
2c419bde KG |
67 | #ifdef CONFIG_HIGHMEM |
68 | pte_t *kmap_pte; | |
8040bda3 | 69 | EXPORT_SYMBOL(kmap_pte); |
2c419bde | 70 | pgprot_t kmap_prot; |
2c419bde | 71 | EXPORT_SYMBOL(kmap_prot); |
2c419bde KG |
72 | |
73 | static inline pte_t *virt_to_kpte(unsigned long vaddr) | |
74 | { | |
75 | return pte_offset_kernel(pmd_offset(pud_offset(pgd_offset_k(vaddr), | |
76 | vaddr), vaddr), vaddr); | |
77 | } | |
78 | #endif | |
79 | ||
14cf11af PM |
80 | int page_is_ram(unsigned long pfn) |
81 | { | |
14cf11af | 82 | #ifndef CONFIG_PPC64 /* XXX for now */ |
a880e762 | 83 | return pfn < max_pfn; |
14cf11af | 84 | #else |
a880e762 | 85 | unsigned long paddr = (pfn << PAGE_SHIFT); |
28be7072 | 86 | struct memblock_region *reg; |
14cf11af | 87 | |
28be7072 BH |
88 | for_each_memblock(memory, reg) |
89 | if (paddr >= reg->base && paddr < (reg->base + reg->size)) | |
14cf11af | 90 | return 1; |
14cf11af PM |
91 | return 0; |
92 | #endif | |
93 | } | |
14cf11af | 94 | |
8b150478 | 95 | pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn, |
14cf11af PM |
96 | unsigned long size, pgprot_t vma_prot) |
97 | { | |
98 | if (ppc_md.phys_mem_access_prot) | |
8b150478 | 99 | return ppc_md.phys_mem_access_prot(file, pfn, size, vma_prot); |
14cf11af | 100 | |
8b150478 | 101 | if (!page_is_ram(pfn)) |
64b3d0e8 BH |
102 | vma_prot = pgprot_noncached(vma_prot); |
103 | ||
14cf11af PM |
104 | return vma_prot; |
105 | } | |
106 | EXPORT_SYMBOL(phys_mem_access_prot); | |
107 | ||
23fd0775 PM |
108 | #ifdef CONFIG_MEMORY_HOTPLUG |
109 | ||
bc02af93 YG |
110 | #ifdef CONFIG_NUMA |
111 | int memory_add_physaddr_to_nid(u64 start) | |
112 | { | |
113 | return hot_add_scn_to_nid(start); | |
114 | } | |
115 | #endif | |
116 | ||
fa90f70a | 117 | int arch_add_memory(int nid, u64 start, u64 size) |
23fd0775 | 118 | { |
237a0989 | 119 | struct pglist_data *pgdata; |
23fd0775 PM |
120 | struct zone *zone; |
121 | unsigned long start_pfn = start >> PAGE_SHIFT; | |
122 | unsigned long nr_pages = size >> PAGE_SHIFT; | |
123 | ||
237a0989 MK |
124 | pgdata = NODE_DATA(nid); |
125 | ||
2d0eee14 | 126 | start = (unsigned long)__va(start); |
a1194097 AB |
127 | if (create_section_mapping(start, start + size)) |
128 | return -EINVAL; | |
54b79248 | 129 | |
23fd0775 PM |
130 | /* this should work for most non-highmem platforms */ |
131 | zone = pgdata->node_zones; | |
132 | ||
c04fc586 | 133 | return __add_pages(nid, zone, start_pfn, nr_pages); |
23fd0775 | 134 | } |
24d335ca WC |
135 | |
136 | #ifdef CONFIG_MEMORY_HOTREMOVE | |
137 | int arch_remove_memory(u64 start, u64 size) | |
138 | { | |
139 | unsigned long start_pfn = start >> PAGE_SHIFT; | |
140 | unsigned long nr_pages = size >> PAGE_SHIFT; | |
141 | struct zone *zone; | |
142 | ||
143 | zone = page_zone(pfn_to_page(start_pfn)); | |
144 | return __remove_pages(zone, start_pfn, nr_pages); | |
145 | } | |
146 | #endif | |
0d579944 | 147 | #endif /* CONFIG_MEMORY_HOTPLUG */ |
a99824f3 BP |
148 | |
149 | /* | |
150 | * walk_memory_resource() needs to make sure there is no holes in a given | |
9d88a2eb | 151 | * memory range. PPC64 does not maintain the memory layout in /proc/iomem. |
95f72d1e | 152 | * Instead it maintains it in memblock.memory structures. Walk through the |
9d88a2eb | 153 | * memory regions, find holes and callback for contiguous regions. |
a99824f3 BP |
154 | */ |
155 | int | |
908eedc6 KH |
156 | walk_system_ram_range(unsigned long start_pfn, unsigned long nr_pages, |
157 | void *arg, int (*func)(unsigned long, unsigned long, void *)) | |
a99824f3 | 158 | { |
28be7072 BH |
159 | struct memblock_region *reg; |
160 | unsigned long end_pfn = start_pfn + nr_pages; | |
161 | unsigned long tstart, tend; | |
9d88a2eb BP |
162 | int ret = -1; |
163 | ||
28be7072 | 164 | for_each_memblock(memory, reg) { |
c7fc2de0 YL |
165 | tstart = max(start_pfn, memblock_region_memory_base_pfn(reg)); |
166 | tend = min(end_pfn, memblock_region_memory_end_pfn(reg)); | |
28be7072 BH |
167 | if (tstart >= tend) |
168 | continue; | |
169 | ret = (*func)(tstart, tend - tstart, arg); | |
9d88a2eb BP |
170 | if (ret) |
171 | break; | |
9d88a2eb BP |
172 | } |
173 | return ret; | |
a99824f3 | 174 | } |
908eedc6 | 175 | EXPORT_SYMBOL_GPL(walk_system_ram_range); |
a99824f3 | 176 | |
7c8c6b97 PM |
177 | /* |
178 | * Initialize the bootmem system and give it all the memory we | |
179 | * have available. If we are using highmem, we only put the | |
180 | * lowmem into the bootmem system. | |
181 | */ | |
182 | #ifndef CONFIG_NEED_MULTIPLE_NODES | |
183 | void __init do_init_bootmem(void) | |
184 | { | |
7c8c6b97 PM |
185 | unsigned long start, bootmap_pages; |
186 | unsigned long total_pages; | |
28be7072 | 187 | struct memblock_region *reg; |
7c8c6b97 PM |
188 | int boot_mapsize; |
189 | ||
95f72d1e YL |
190 | max_low_pfn = max_pfn = memblock_end_of_DRAM() >> PAGE_SHIFT; |
191 | total_pages = (memblock_end_of_DRAM() - memstart_addr) >> PAGE_SHIFT; | |
7c8c6b97 PM |
192 | #ifdef CONFIG_HIGHMEM |
193 | total_pages = total_lowmem >> PAGE_SHIFT; | |
d7917ba7 | 194 | max_low_pfn = lowmem_end_addr >> PAGE_SHIFT; |
7c8c6b97 PM |
195 | #endif |
196 | ||
197 | /* | |
198 | * Find an area to use for the bootmem bitmap. Calculate the size of | |
199 | * bitmap required as (Total Memory) / PAGE_SIZE / BITS_PER_BYTE. | |
200 | * Add 1 additional page in case the address isn't page-aligned. | |
201 | */ | |
202 | bootmap_pages = bootmem_bootmap_pages(total_pages); | |
203 | ||
95f72d1e | 204 | start = memblock_alloc(bootmap_pages << PAGE_SHIFT, PAGE_SIZE); |
7c8c6b97 | 205 | |
37dd2bad KG |
206 | min_low_pfn = MEMORY_START >> PAGE_SHIFT; |
207 | boot_mapsize = init_bootmem_node(NODE_DATA(0), start >> PAGE_SHIFT, min_low_pfn, max_low_pfn); | |
7c8c6b97 | 208 | |
4e8309ba CS |
209 | /* Place all memblock_regions in the same node and merge contiguous |
210 | * memblock_regions | |
211 | */ | |
e7e8de59 | 212 | memblock_set_node(0, (phys_addr_t)ULLONG_MAX, &memblock.memory, 0); |
c67c3cb4 | 213 | |
7c8c6b97 PM |
214 | /* Add all physical memory to the bootmem map, mark each area |
215 | * present. | |
216 | */ | |
7c8c6b97 | 217 | #ifdef CONFIG_HIGHMEM |
d7917ba7 | 218 | free_bootmem_with_active_regions(0, lowmem_end_addr >> PAGE_SHIFT); |
f98eeb4e KG |
219 | |
220 | /* reserve the sections we're already using */ | |
28be7072 BH |
221 | for_each_memblock(reserved, reg) { |
222 | unsigned long top = reg->base + reg->size - 1; | |
223 | if (top < lowmem_end_addr) | |
224 | reserve_bootmem(reg->base, reg->size, BOOTMEM_DEFAULT); | |
225 | else if (reg->base < lowmem_end_addr) { | |
226 | unsigned long trunc_size = lowmem_end_addr - reg->base; | |
227 | reserve_bootmem(reg->base, trunc_size, BOOTMEM_DEFAULT); | |
f98eeb4e KG |
228 | } |
229 | } | |
c67c3cb4 MG |
230 | #else |
231 | free_bootmem_with_active_regions(0, max_pfn); | |
7c8c6b97 PM |
232 | |
233 | /* reserve the sections we're already using */ | |
28be7072 BH |
234 | for_each_memblock(reserved, reg) |
235 | reserve_bootmem(reg->base, reg->size, BOOTMEM_DEFAULT); | |
f98eeb4e | 236 | #endif |
7c8c6b97 | 237 | /* XXX need to clip this if using highmem? */ |
c67c3cb4 MG |
238 | sparse_memory_present_with_active_regions(0); |
239 | ||
7c8c6b97 PM |
240 | init_bootmem_done = 1; |
241 | } | |
242 | ||
4e8ad3e8 JB |
243 | /* mark pages that don't exist as nosave */ |
244 | static int __init mark_nonram_nosave(void) | |
245 | { | |
28be7072 BH |
246 | struct memblock_region *reg, *prev = NULL; |
247 | ||
248 | for_each_memblock(memory, reg) { | |
249 | if (prev && | |
c7fc2de0 YL |
250 | memblock_region_memory_end_pfn(prev) < memblock_region_memory_base_pfn(reg)) |
251 | register_nosave_region(memblock_region_memory_end_pfn(prev), | |
252 | memblock_region_memory_base_pfn(reg)); | |
28be7072 | 253 | prev = reg; |
4e8ad3e8 | 254 | } |
4e8ad3e8 JB |
255 | return 0; |
256 | } | |
257 | ||
7c8c6b97 PM |
258 | /* |
259 | * paging_init() sets up the page tables - in fact we've already done this. | |
260 | */ | |
261 | void __init paging_init(void) | |
262 | { | |
f7ba2991 | 263 | unsigned long long total_ram = memblock_phys_mem_size(); |
95f72d1e | 264 | phys_addr_t top_of_ram = memblock_end_of_DRAM(); |
c67c3cb4 | 265 | unsigned long max_zone_pfns[MAX_NR_ZONES]; |
7c8c6b97 | 266 | |
2c419bde KG |
267 | #ifdef CONFIG_PPC32 |
268 | unsigned long v = __fix_to_virt(__end_of_fixed_addresses - 1); | |
269 | unsigned long end = __fix_to_virt(FIX_HOLE); | |
270 | ||
271 | for (; v < end; v += PAGE_SIZE) | |
272 | map_page(v, 0, 0); /* XXX gross */ | |
273 | #endif | |
274 | ||
7c8c6b97 PM |
275 | #ifdef CONFIG_HIGHMEM |
276 | map_page(PKMAP_BASE, 0, 0); /* XXX gross */ | |
2c419bde KG |
277 | pkmap_page_table = virt_to_kpte(PKMAP_BASE); |
278 | ||
279 | kmap_pte = virt_to_kpte(__fix_to_virt(FIX_KMAP_BEGIN)); | |
7c8c6b97 PM |
280 | kmap_prot = PAGE_KERNEL; |
281 | #endif /* CONFIG_HIGHMEM */ | |
282 | ||
f7ba2991 | 283 | printk(KERN_DEBUG "Top of RAM: 0x%llx, Total RAM: 0x%llx\n", |
fb610635 | 284 | (unsigned long long)top_of_ram, total_ram); |
e110b281 | 285 | printk(KERN_DEBUG "Memory hole size: %ldMB\n", |
2bf3016f | 286 | (long int)((top_of_ram - total_ram) >> 20)); |
6391af17 | 287 | memset(max_zone_pfns, 0, sizeof(max_zone_pfns)); |
7c8c6b97 | 288 | #ifdef CONFIG_HIGHMEM |
d7917ba7 | 289 | max_zone_pfns[ZONE_DMA] = lowmem_end_addr >> PAGE_SHIFT; |
6391af17 | 290 | max_zone_pfns[ZONE_HIGHMEM] = top_of_ram >> PAGE_SHIFT; |
7c8c6b97 | 291 | #else |
6391af17 | 292 | max_zone_pfns[ZONE_DMA] = top_of_ram >> PAGE_SHIFT; |
c67c3cb4 MG |
293 | #endif |
294 | free_area_init_nodes(max_zone_pfns); | |
4e8ad3e8 JB |
295 | |
296 | mark_nonram_nosave(); | |
7c8c6b97 PM |
297 | } |
298 | #endif /* ! CONFIG_NEED_MULTIPLE_NODES */ | |
299 | ||
f7e3334a NF |
300 | static void __init register_page_bootmem_info(void) |
301 | { | |
302 | int i; | |
303 | ||
304 | for_each_online_node(i) | |
305 | register_page_bootmem_info_node(NODE_DATA(i)); | |
306 | } | |
307 | ||
7c8c6b97 PM |
308 | void __init mem_init(void) |
309 | { | |
28efc35f SW |
310 | /* |
311 | * book3s is limited to 16 page sizes due to encoding this in | |
312 | * a 4-bit field for slices. | |
313 | */ | |
314 | BUILD_BUG_ON(MMU_PAGE_COUNT > 16); | |
315 | ||
a9327296 | 316 | #ifdef CONFIG_SWIOTLB |
688ba1db | 317 | swiotlb_init(0); |
a9327296 FT |
318 | #endif |
319 | ||
f7e3334a | 320 | register_page_bootmem_info(); |
7c8c6b97 | 321 | high_memory = (void *) __va(max_low_pfn * PAGE_SIZE); |
602ddc70 | 322 | set_max_mapnr(max_pfn); |
0c988534 | 323 | free_all_bootmem(); |
7c8c6b97 PM |
324 | |
325 | #ifdef CONFIG_HIGHMEM | |
326 | { | |
327 | unsigned long pfn, highmem_mapnr; | |
328 | ||
d7917ba7 | 329 | highmem_mapnr = lowmem_end_addr >> PAGE_SHIFT; |
7c8c6b97 | 330 | for (pfn = highmem_mapnr; pfn < max_mapnr; ++pfn) { |
3d41e0f6 | 331 | phys_addr_t paddr = (phys_addr_t)pfn << PAGE_SHIFT; |
7c8c6b97 | 332 | struct page *page = pfn_to_page(pfn); |
369a9d85 JL |
333 | if (!memblock_is_reserved(paddr)) |
334 | free_highmem_page(page); | |
7c8c6b97 | 335 | } |
7c8c6b97 PM |
336 | } |
337 | #endif /* CONFIG_HIGHMEM */ | |
338 | ||
3160b097 BB |
339 | #if defined(CONFIG_PPC_FSL_BOOK3E) && !defined(CONFIG_SMP) |
340 | /* | |
341 | * If smp is enabled, next_tlbcam_idx is initialized in the cpu up | |
342 | * functions.... do it here for the non-smp case. | |
343 | */ | |
344 | per_cpu(next_tlbcam_idx, smp_processor_id()) = | |
345 | (mfspr(SPRN_TLB1CFG) & TLBnCFG_N_ENTRY) - 1; | |
346 | #endif | |
347 | ||
369a9d85 | 348 | mem_init_print_info(NULL); |
f637a49e BH |
349 | #ifdef CONFIG_PPC32 |
350 | pr_info("Kernel virtual memory layout:\n"); | |
351 | pr_info(" * 0x%08lx..0x%08lx : fixmap\n", FIXADDR_START, FIXADDR_TOP); | |
352 | #ifdef CONFIG_HIGHMEM | |
353 | pr_info(" * 0x%08lx..0x%08lx : highmem PTEs\n", | |
354 | PKMAP_BASE, PKMAP_ADDR(LAST_PKMAP)); | |
355 | #endif /* CONFIG_HIGHMEM */ | |
8b31e49d BH |
356 | #ifdef CONFIG_NOT_COHERENT_CACHE |
357 | pr_info(" * 0x%08lx..0x%08lx : consistent mem\n", | |
358 | IOREMAP_TOP, IOREMAP_TOP + CONFIG_CONSISTENT_SIZE); | |
359 | #endif /* CONFIG_NOT_COHERENT_CACHE */ | |
f637a49e BH |
360 | pr_info(" * 0x%08lx..0x%08lx : early ioremap\n", |
361 | ioremap_bot, IOREMAP_TOP); | |
362 | pr_info(" * 0x%08lx..0x%08lx : vmalloc & ioremap\n", | |
363 | VMALLOC_START, VMALLOC_END); | |
364 | #endif /* CONFIG_PPC32 */ | |
365 | ||
7c8c6b97 | 366 | mem_init_done = 1; |
7c8c6b97 PM |
367 | } |
368 | ||
2773fcc8 DC |
369 | void free_initmem(void) |
370 | { | |
a9c0f41b | 371 | ppc_md.progress = ppc_printk_progress; |
5d585e5c | 372 | free_initmem_default(POISON_FREE_INITMEM); |
2773fcc8 DC |
373 | } |
374 | ||
307cfe71 BH |
375 | #ifdef CONFIG_BLK_DEV_INITRD |
376 | void __init free_initrd_mem(unsigned long start, unsigned long end) | |
377 | { | |
dbe67df4 | 378 | free_reserved_area((void *)start, (void *)end, -1, "initrd"); |
307cfe71 BH |
379 | } |
380 | #endif | |
381 | ||
14cf11af PM |
382 | /* |
383 | * This is called when a page has been modified by the kernel. | |
384 | * It just marks the page as not i-cache clean. We do the i-cache | |
385 | * flush later when the page is given to a user process, if necessary. | |
386 | */ | |
387 | void flush_dcache_page(struct page *page) | |
388 | { | |
389 | if (cpu_has_feature(CPU_FTR_COHERENT_ICACHE)) | |
390 | return; | |
391 | /* avoid an atomic op if possible */ | |
392 | if (test_bit(PG_arch_1, &page->flags)) | |
393 | clear_bit(PG_arch_1, &page->flags); | |
394 | } | |
395 | EXPORT_SYMBOL(flush_dcache_page); | |
396 | ||
397 | void flush_dcache_icache_page(struct page *page) | |
398 | { | |
0895ecda DG |
399 | #ifdef CONFIG_HUGETLB_PAGE |
400 | if (PageCompound(page)) { | |
401 | flush_dcache_icache_hugepage(page); | |
402 | return; | |
403 | } | |
404 | #endif | |
14cf11af | 405 | #ifdef CONFIG_BOOKE |
0895ecda | 406 | { |
2480b208 | 407 | void *start = kmap_atomic(page); |
0895ecda | 408 | __flush_dcache_icache(start); |
2480b208 | 409 | kunmap_atomic(start); |
0895ecda | 410 | } |
ab1f9dac | 411 | #elif defined(CONFIG_8xx) || defined(CONFIG_PPC64) |
14cf11af PM |
412 | /* On 8xx there is no need to kmap since highmem is not supported */ |
413 | __flush_dcache_icache(page_address(page)); | |
414 | #else | |
415 | __flush_dcache_icache_phys(page_to_pfn(page) << PAGE_SHIFT); | |
416 | #endif | |
14cf11af | 417 | } |
249ba1ee | 418 | EXPORT_SYMBOL(flush_dcache_icache_page); |
0895ecda | 419 | |
14cf11af PM |
420 | void clear_user_page(void *page, unsigned long vaddr, struct page *pg) |
421 | { | |
422 | clear_page(page); | |
423 | ||
14cf11af | 424 | /* |
25985edc | 425 | * We shouldn't have to do this, but some versions of glibc |
14cf11af PM |
426 | * require it (ld.so assumes zero filled pages are icache clean) |
427 | * - Anton | |
428 | */ | |
09f5dc44 | 429 | flush_dcache_page(pg); |
14cf11af PM |
430 | } |
431 | EXPORT_SYMBOL(clear_user_page); | |
432 | ||
433 | void copy_user_page(void *vto, void *vfrom, unsigned long vaddr, | |
434 | struct page *pg) | |
435 | { | |
436 | copy_page(vto, vfrom); | |
437 | ||
438 | /* | |
439 | * We should be able to use the following optimisation, however | |
440 | * there are two problems. | |
441 | * Firstly a bug in some versions of binutils meant PLT sections | |
442 | * were not marked executable. | |
443 | * Secondly the first word in the GOT section is blrl, used | |
444 | * to establish the GOT address. Until recently the GOT was | |
445 | * not marked executable. | |
446 | * - Anton | |
447 | */ | |
448 | #if 0 | |
449 | if (!vma->vm_file && ((vma->vm_flags & VM_EXEC) == 0)) | |
450 | return; | |
451 | #endif | |
452 | ||
09f5dc44 | 453 | flush_dcache_page(pg); |
14cf11af PM |
454 | } |
455 | ||
456 | void flush_icache_user_range(struct vm_area_struct *vma, struct page *page, | |
457 | unsigned long addr, int len) | |
458 | { | |
459 | unsigned long maddr; | |
460 | ||
461 | maddr = (unsigned long) kmap(page) + (addr & ~PAGE_MASK); | |
462 | flush_icache_range(maddr, maddr + len); | |
463 | kunmap(page); | |
464 | } | |
465 | EXPORT_SYMBOL(flush_icache_user_range); | |
466 | ||
467 | /* | |
468 | * This is called at the end of handling a user page fault, when the | |
469 | * fault has been handled by updating a PTE in the linux page tables. | |
470 | * We use it to preload an HPTE into the hash table corresponding to | |
471 | * the updated linux PTE. | |
472 | * | |
01edcd89 | 473 | * This must always be called with the pte lock held. |
14cf11af PM |
474 | */ |
475 | void update_mmu_cache(struct vm_area_struct *vma, unsigned long address, | |
4b3073e1 | 476 | pte_t *ptep) |
14cf11af | 477 | { |
3c726f8d | 478 | #ifdef CONFIG_PPC_STD_MMU |
0ac52dd7 AK |
479 | /* |
480 | * We don't need to worry about _PAGE_PRESENT here because we are | |
481 | * called with either mm->page_table_lock held or ptl lock held | |
482 | */ | |
3c726f8d | 483 | unsigned long access = 0, trap; |
14cf11af | 484 | |
14cf11af | 485 | /* We only want HPTEs for linux PTEs that have _PAGE_ACCESSED set */ |
4b3073e1 | 486 | if (!pte_young(*ptep) || address >= TASK_SIZE) |
14cf11af | 487 | return; |
14cf11af | 488 | |
3c726f8d BH |
489 | /* We try to figure out if we are coming from an instruction |
490 | * access fault and pass that down to __hash_page so we avoid | |
491 | * double-faulting on execution of fresh text. We have to test | |
492 | * for regs NULL since init will get here first thing at boot | |
493 | * | |
494 | * We also avoid filling the hash if not coming from a fault | |
495 | */ | |
496 | if (current->thread.regs == NULL) | |
14cf11af | 497 | return; |
3c726f8d BH |
498 | trap = TRAP(current->thread.regs); |
499 | if (trap == 0x400) | |
500 | access |= _PAGE_EXEC; | |
501 | else if (trap != 0x300) | |
502 | return; | |
503 | hash_preload(vma->vm_mm, address, access, trap); | |
504 | #endif /* CONFIG_PPC_STD_MMU */ | |
41151e77 BB |
505 | #if (defined(CONFIG_PPC_BOOK3E_64) || defined(CONFIG_PPC_FSL_BOOK3E)) \ |
506 | && defined(CONFIG_HUGETLB_PAGE) | |
507 | if (is_vm_hugetlb_page(vma)) | |
d93e4d7d | 508 | book3e_hugetlb_preload(vma, address, *ptep); |
41151e77 | 509 | #endif |
14cf11af | 510 | } |
c40dd2f7 AB |
511 | |
512 | /* | |
513 | * System memory should not be in /proc/iomem but various tools expect it | |
514 | * (eg kdump). | |
515 | */ | |
4f770924 | 516 | static int __init add_system_ram_resources(void) |
c40dd2f7 AB |
517 | { |
518 | struct memblock_region *reg; | |
519 | ||
520 | for_each_memblock(memory, reg) { | |
521 | struct resource *res; | |
522 | unsigned long base = reg->base; | |
523 | unsigned long size = reg->size; | |
524 | ||
525 | res = kzalloc(sizeof(struct resource), GFP_KERNEL); | |
526 | WARN_ON(!res); | |
527 | ||
528 | if (res) { | |
529 | res->name = "System RAM"; | |
530 | res->start = base; | |
531 | res->end = base + size - 1; | |
f748edaf | 532 | res->flags = IORESOURCE_MEM | IORESOURCE_BUSY; |
c40dd2f7 AB |
533 | WARN_ON(request_resource(&iomem_resource, res) < 0); |
534 | } | |
535 | } | |
536 | ||
537 | return 0; | |
538 | } | |
539 | subsys_initcall(add_system_ram_resources); | |
1d54cf2b | 540 | |
541 | #ifdef CONFIG_STRICT_DEVMEM | |
542 | /* | |
543 | * devmem_is_allowed(): check to see if /dev/mem access to a certain address | |
544 | * is valid. The argument is a physical page number. | |
545 | * | |
546 | * Access has to be given to non-kernel-ram areas as well, these contain the | |
547 | * PCI mmio resources as well as potential bios/acpi data regions. | |
548 | */ | |
549 | int devmem_is_allowed(unsigned long pfn) | |
550 | { | |
551 | if (iomem_is_exclusive(pfn << PAGE_SHIFT)) | |
552 | return 0; | |
553 | if (!page_is_ram(pfn)) | |
554 | return 1; | |
8a3e3d31 | 555 | if (page_is_rtas_user_buf(pfn)) |
556 | return 1; | |
1d54cf2b | 557 | return 0; |
558 | } | |
559 | #endif /* CONFIG_STRICT_DEVMEM */ |