Commit | Line | Data |
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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> |
b584c254 | 39 | #include <linux/memremap.h> |
14cf11af PM |
40 | |
41 | #include <asm/pgalloc.h> | |
42 | #include <asm/prom.h> | |
43 | #include <asm/io.h> | |
44 | #include <asm/mmu_context.h> | |
45 | #include <asm/pgtable.h> | |
46 | #include <asm/mmu.h> | |
47 | #include <asm/smp.h> | |
48 | #include <asm/machdep.h> | |
49 | #include <asm/btext.h> | |
50 | #include <asm/tlb.h> | |
7c8c6b97 | 51 | #include <asm/sections.h> |
db7f37de | 52 | #include <asm/sparsemem.h> |
ab1f9dac | 53 | #include <asm/vdso.h> |
2c419bde | 54 | #include <asm/fixmap.h> |
a9327296 | 55 | #include <asm/swiotlb.h> |
8a3e3d31 | 56 | #include <asm/rtas.h> |
14cf11af | 57 | |
14cf11af PM |
58 | #include "mmu_decl.h" |
59 | ||
60 | #ifndef CPU_FTR_COHERENT_ICACHE | |
61 | #define CPU_FTR_COHERENT_ICACHE 0 /* XXX for now */ | |
62 | #define CPU_FTR_NOEXECUTE 0 | |
63 | #endif | |
64 | ||
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); |
dd0b52c4 | 72 | #define TOP_ZONE ZONE_HIGHMEM |
2c419bde KG |
73 | |
74 | static inline pte_t *virt_to_kpte(unsigned long vaddr) | |
75 | { | |
76 | return pte_offset_kernel(pmd_offset(pud_offset(pgd_offset_k(vaddr), | |
77 | vaddr), vaddr), vaddr); | |
78 | } | |
dd0b52c4 OH |
79 | #else |
80 | #define TOP_ZONE ZONE_NORMAL | |
2c419bde KG |
81 | #endif |
82 | ||
14cf11af PM |
83 | int page_is_ram(unsigned long pfn) |
84 | { | |
14cf11af | 85 | #ifndef CONFIG_PPC64 /* XXX for now */ |
a880e762 | 86 | return pfn < max_pfn; |
14cf11af | 87 | #else |
a880e762 | 88 | unsigned long paddr = (pfn << PAGE_SHIFT); |
28be7072 | 89 | struct memblock_region *reg; |
14cf11af | 90 | |
28be7072 BH |
91 | for_each_memblock(memory, reg) |
92 | if (paddr >= reg->base && paddr < (reg->base + reg->size)) | |
14cf11af | 93 | return 1; |
14cf11af PM |
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 | ||
29ab6c47 | 120 | int __weak create_section_mapping(unsigned long start, unsigned long end, int nid) |
fecbfabe BH |
121 | { |
122 | return -ENODEV; | |
123 | } | |
124 | ||
125 | int __weak remove_section_mapping(unsigned long start, unsigned long end) | |
126 | { | |
127 | return -ENODEV; | |
128 | } | |
129 | ||
24e6d5a5 CH |
130 | int arch_add_memory(int nid, u64 start, u64 size, struct vmem_altmap *altmap, |
131 | bool want_memblock) | |
23fd0775 | 132 | { |
23fd0775 PM |
133 | unsigned long start_pfn = start >> PAGE_SHIFT; |
134 | unsigned long nr_pages = size >> PAGE_SHIFT; | |
1dace6c6 | 135 | int rc; |
23fd0775 | 136 | |
438cc81a DG |
137 | resize_hpt_for_hotplug(memblock_phys_mem_size()); |
138 | ||
2d0eee14 | 139 | start = (unsigned long)__va(start); |
29ab6c47 | 140 | rc = create_section_mapping(start, start + size, nid); |
1dace6c6 | 141 | if (rc) { |
f2c2cbcc | 142 | pr_warn("Unable to create mapping for hot added memory 0x%llx..0x%llx: %d\n", |
1dace6c6 DG |
143 | start, start + size, rc); |
144 | return -EFAULT; | |
145 | } | |
54b79248 | 146 | |
24e6d5a5 | 147 | return __add_pages(nid, start_pfn, nr_pages, altmap, want_memblock); |
23fd0775 | 148 | } |
24d335ca WC |
149 | |
150 | #ifdef CONFIG_MEMORY_HOTREMOVE | |
da024512 | 151 | int arch_remove_memory(u64 start, u64 size, struct vmem_altmap *altmap) |
24d335ca WC |
152 | { |
153 | unsigned long start_pfn = start >> PAGE_SHIFT; | |
154 | unsigned long nr_pages = size >> PAGE_SHIFT; | |
b584c254 | 155 | struct page *page; |
9ac8cde9 | 156 | int ret; |
24d335ca | 157 | |
b584c254 OH |
158 | /* |
159 | * If we have an altmap then we need to skip over any reserved PFNs | |
160 | * when querying the zone. | |
161 | */ | |
162 | page = pfn_to_page(start_pfn); | |
b584c254 OH |
163 | if (altmap) |
164 | page += vmem_altmap_offset(altmap); | |
165 | ||
da024512 | 166 | ret = __remove_pages(page_zone(page), start_pfn, nr_pages, altmap); |
16d0f5c4 AB |
167 | if (ret) |
168 | return ret; | |
169 | ||
170 | /* Remove htab bolted mappings for this section of memory */ | |
171 | start = (unsigned long)__va(start); | |
172 | ret = remove_section_mapping(start, start + size); | |
173 | ||
174 | /* Ensure all vmalloc mappings are flushed in case they also | |
175 | * hit that section of memory | |
176 | */ | |
177 | vm_unmap_aliases(); | |
9ac8cde9 | 178 | |
438cc81a DG |
179 | resize_hpt_for_hotplug(memblock_phys_mem_size()); |
180 | ||
9ac8cde9 | 181 | return ret; |
24d335ca WC |
182 | } |
183 | #endif | |
0d579944 | 184 | #endif /* CONFIG_MEMORY_HOTPLUG */ |
a99824f3 BP |
185 | |
186 | /* | |
187 | * walk_memory_resource() needs to make sure there is no holes in a given | |
9d88a2eb | 188 | * memory range. PPC64 does not maintain the memory layout in /proc/iomem. |
95f72d1e | 189 | * Instead it maintains it in memblock.memory structures. Walk through the |
9d88a2eb | 190 | * memory regions, find holes and callback for contiguous regions. |
a99824f3 BP |
191 | */ |
192 | int | |
908eedc6 KH |
193 | walk_system_ram_range(unsigned long start_pfn, unsigned long nr_pages, |
194 | void *arg, int (*func)(unsigned long, unsigned long, void *)) | |
a99824f3 | 195 | { |
28be7072 BH |
196 | struct memblock_region *reg; |
197 | unsigned long end_pfn = start_pfn + nr_pages; | |
198 | unsigned long tstart, tend; | |
9d88a2eb BP |
199 | int ret = -1; |
200 | ||
28be7072 | 201 | for_each_memblock(memory, reg) { |
c7fc2de0 YL |
202 | tstart = max(start_pfn, memblock_region_memory_base_pfn(reg)); |
203 | tend = min(end_pfn, memblock_region_memory_end_pfn(reg)); | |
28be7072 BH |
204 | if (tstart >= tend) |
205 | continue; | |
206 | ret = (*func)(tstart, tend - tstart, arg); | |
9d88a2eb BP |
207 | if (ret) |
208 | break; | |
9d88a2eb BP |
209 | } |
210 | return ret; | |
a99824f3 | 211 | } |
908eedc6 | 212 | EXPORT_SYMBOL_GPL(walk_system_ram_range); |
a99824f3 | 213 | |
7c8c6b97 | 214 | #ifndef CONFIG_NEED_MULTIPLE_NODES |
9bd9be00 | 215 | void __init mem_topology_setup(void) |
7c8c6b97 | 216 | { |
95f72d1e | 217 | max_low_pfn = max_pfn = memblock_end_of_DRAM() >> PAGE_SHIFT; |
10239733 | 218 | min_low_pfn = MEMORY_START >> PAGE_SHIFT; |
7c8c6b97 | 219 | #ifdef CONFIG_HIGHMEM |
d7917ba7 | 220 | max_low_pfn = lowmem_end_addr >> PAGE_SHIFT; |
7c8c6b97 PM |
221 | #endif |
222 | ||
4e8309ba CS |
223 | /* Place all memblock_regions in the same node and merge contiguous |
224 | * memblock_regions | |
225 | */ | |
e7e8de59 | 226 | memblock_set_node(0, (phys_addr_t)ULLONG_MAX, &memblock.memory, 0); |
9bd9be00 | 227 | } |
c67c3cb4 | 228 | |
9bd9be00 NP |
229 | void __init initmem_init(void) |
230 | { | |
7c8c6b97 | 231 | /* XXX need to clip this if using highmem? */ |
c67c3cb4 | 232 | sparse_memory_present_with_active_regions(0); |
21098b9e | 233 | sparse_init(); |
7c8c6b97 PM |
234 | } |
235 | ||
4e8ad3e8 JB |
236 | /* mark pages that don't exist as nosave */ |
237 | static int __init mark_nonram_nosave(void) | |
238 | { | |
28be7072 BH |
239 | struct memblock_region *reg, *prev = NULL; |
240 | ||
241 | for_each_memblock(memory, reg) { | |
242 | if (prev && | |
c7fc2de0 YL |
243 | memblock_region_memory_end_pfn(prev) < memblock_region_memory_base_pfn(reg)) |
244 | register_nosave_region(memblock_region_memory_end_pfn(prev), | |
245 | memblock_region_memory_base_pfn(reg)); | |
28be7072 | 246 | prev = reg; |
4e8ad3e8 | 247 | } |
4e8ad3e8 JB |
248 | return 0; |
249 | } | |
6db35ad2 SW |
250 | #else /* CONFIG_NEED_MULTIPLE_NODES */ |
251 | static int __init mark_nonram_nosave(void) | |
252 | { | |
253 | return 0; | |
254 | } | |
255 | #endif | |
4e8ad3e8 | 256 | |
1c98025c SW |
257 | static bool zone_limits_final; |
258 | ||
3079abe5 OH |
259 | /* |
260 | * The memory zones past TOP_ZONE are managed by generic mm code. | |
261 | * These should be set to zero since that's what every other | |
262 | * architecture does. | |
263 | */ | |
1c98025c | 264 | static unsigned long max_zone_pfns[MAX_NR_ZONES] = { |
3079abe5 OH |
265 | [0 ... TOP_ZONE ] = ~0UL, |
266 | [TOP_ZONE + 1 ... MAX_NR_ZONES - 1] = 0 | |
1c98025c SW |
267 | }; |
268 | ||
269 | /* | |
270 | * Restrict the specified zone and all more restrictive zones | |
271 | * to be below the specified pfn. May not be called after | |
272 | * paging_init(). | |
273 | */ | |
274 | void __init limit_zone_pfn(enum zone_type zone, unsigned long pfn_limit) | |
275 | { | |
276 | int i; | |
277 | ||
278 | if (WARN_ON(zone_limits_final)) | |
279 | return; | |
280 | ||
281 | for (i = zone; i >= 0; i--) { | |
282 | if (max_zone_pfns[i] > pfn_limit) | |
283 | max_zone_pfns[i] = pfn_limit; | |
284 | } | |
285 | } | |
286 | ||
287 | /* | |
288 | * Find the least restrictive zone that is entirely below the | |
289 | * specified pfn limit. Returns < 0 if no suitable zone is found. | |
290 | * | |
291 | * pfn_limit must be u64 because it can exceed 32 bits even on 32-bit | |
292 | * systems -- the DMA limit can be higher than any possible real pfn. | |
293 | */ | |
294 | int dma_pfn_limit_to_zone(u64 pfn_limit) | |
295 | { | |
1c98025c SW |
296 | int i; |
297 | ||
dd0b52c4 | 298 | for (i = TOP_ZONE; i >= 0; i--) { |
1c98025c SW |
299 | if (max_zone_pfns[i] <= pfn_limit) |
300 | return i; | |
301 | } | |
302 | ||
303 | return -EPERM; | |
304 | } | |
4e8ad3e8 | 305 | |
7c8c6b97 PM |
306 | /* |
307 | * paging_init() sets up the page tables - in fact we've already done this. | |
308 | */ | |
309 | void __init paging_init(void) | |
310 | { | |
f7ba2991 | 311 | unsigned long long total_ram = memblock_phys_mem_size(); |
95f72d1e | 312 | phys_addr_t top_of_ram = memblock_end_of_DRAM(); |
7c8c6b97 | 313 | |
2c419bde KG |
314 | #ifdef CONFIG_PPC32 |
315 | unsigned long v = __fix_to_virt(__end_of_fixed_addresses - 1); | |
316 | unsigned long end = __fix_to_virt(FIX_HOLE); | |
317 | ||
318 | for (; v < end; v += PAGE_SIZE) | |
4386c096 | 319 | map_kernel_page(v, 0, 0); /* XXX gross */ |
2c419bde KG |
320 | #endif |
321 | ||
7c8c6b97 | 322 | #ifdef CONFIG_HIGHMEM |
4386c096 | 323 | map_kernel_page(PKMAP_BASE, 0, 0); /* XXX gross */ |
2c419bde KG |
324 | pkmap_page_table = virt_to_kpte(PKMAP_BASE); |
325 | ||
326 | kmap_pte = virt_to_kpte(__fix_to_virt(FIX_KMAP_BEGIN)); | |
7c8c6b97 PM |
327 | kmap_prot = PAGE_KERNEL; |
328 | #endif /* CONFIG_HIGHMEM */ | |
329 | ||
f7ba2991 | 330 | printk(KERN_DEBUG "Top of RAM: 0x%llx, Total RAM: 0x%llx\n", |
fb610635 | 331 | (unsigned long long)top_of_ram, total_ram); |
e110b281 | 332 | printk(KERN_DEBUG "Memory hole size: %ldMB\n", |
2bf3016f | 333 | (long int)((top_of_ram - total_ram) >> 20)); |
1c98025c | 334 | |
7c8c6b97 | 335 | #ifdef CONFIG_HIGHMEM |
1c98025c | 336 | limit_zone_pfn(ZONE_NORMAL, lowmem_end_addr >> PAGE_SHIFT); |
c67c3cb4 | 337 | #endif |
dd0b52c4 | 338 | limit_zone_pfn(TOP_ZONE, top_of_ram >> PAGE_SHIFT); |
1c98025c | 339 | zone_limits_final = true; |
c67c3cb4 | 340 | free_area_init_nodes(max_zone_pfns); |
4e8ad3e8 JB |
341 | |
342 | mark_nonram_nosave(); | |
7c8c6b97 | 343 | } |
7c8c6b97 PM |
344 | |
345 | void __init mem_init(void) | |
346 | { | |
28efc35f SW |
347 | /* |
348 | * book3s is limited to 16 page sizes due to encoding this in | |
349 | * a 4-bit field for slices. | |
350 | */ | |
351 | BUILD_BUG_ON(MMU_PAGE_COUNT > 16); | |
352 | ||
a9327296 | 353 | #ifdef CONFIG_SWIOTLB |
688ba1db | 354 | swiotlb_init(0); |
a9327296 FT |
355 | #endif |
356 | ||
7c8c6b97 | 357 | high_memory = (void *) __va(max_low_pfn * PAGE_SIZE); |
602ddc70 | 358 | set_max_mapnr(max_pfn); |
0c988534 | 359 | free_all_bootmem(); |
7c8c6b97 PM |
360 | |
361 | #ifdef CONFIG_HIGHMEM | |
362 | { | |
363 | unsigned long pfn, highmem_mapnr; | |
364 | ||
d7917ba7 | 365 | highmem_mapnr = lowmem_end_addr >> PAGE_SHIFT; |
7c8c6b97 | 366 | for (pfn = highmem_mapnr; pfn < max_mapnr; ++pfn) { |
3d41e0f6 | 367 | phys_addr_t paddr = (phys_addr_t)pfn << PAGE_SHIFT; |
7c8c6b97 | 368 | struct page *page = pfn_to_page(pfn); |
369a9d85 JL |
369 | if (!memblock_is_reserved(paddr)) |
370 | free_highmem_page(page); | |
7c8c6b97 | 371 | } |
7c8c6b97 PM |
372 | } |
373 | #endif /* CONFIG_HIGHMEM */ | |
374 | ||
3160b097 BB |
375 | #if defined(CONFIG_PPC_FSL_BOOK3E) && !defined(CONFIG_SMP) |
376 | /* | |
377 | * If smp is enabled, next_tlbcam_idx is initialized in the cpu up | |
378 | * functions.... do it here for the non-smp case. | |
379 | */ | |
380 | per_cpu(next_tlbcam_idx, smp_processor_id()) = | |
381 | (mfspr(SPRN_TLB1CFG) & TLBnCFG_N_ENTRY) - 1; | |
382 | #endif | |
383 | ||
369a9d85 | 384 | mem_init_print_info(NULL); |
f637a49e BH |
385 | #ifdef CONFIG_PPC32 |
386 | pr_info("Kernel virtual memory layout:\n"); | |
387 | pr_info(" * 0x%08lx..0x%08lx : fixmap\n", FIXADDR_START, FIXADDR_TOP); | |
388 | #ifdef CONFIG_HIGHMEM | |
389 | pr_info(" * 0x%08lx..0x%08lx : highmem PTEs\n", | |
390 | PKMAP_BASE, PKMAP_ADDR(LAST_PKMAP)); | |
391 | #endif /* CONFIG_HIGHMEM */ | |
8b31e49d BH |
392 | #ifdef CONFIG_NOT_COHERENT_CACHE |
393 | pr_info(" * 0x%08lx..0x%08lx : consistent mem\n", | |
394 | IOREMAP_TOP, IOREMAP_TOP + CONFIG_CONSISTENT_SIZE); | |
395 | #endif /* CONFIG_NOT_COHERENT_CACHE */ | |
f637a49e BH |
396 | pr_info(" * 0x%08lx..0x%08lx : early ioremap\n", |
397 | ioremap_bot, IOREMAP_TOP); | |
398 | pr_info(" * 0x%08lx..0x%08lx : vmalloc & ioremap\n", | |
399 | VMALLOC_START, VMALLOC_END); | |
400 | #endif /* CONFIG_PPC32 */ | |
7c8c6b97 PM |
401 | } |
402 | ||
2773fcc8 DC |
403 | void free_initmem(void) |
404 | { | |
a9c0f41b | 405 | ppc_md.progress = ppc_printk_progress; |
029d9252 | 406 | mark_initmem_nx(); |
5d585e5c | 407 | free_initmem_default(POISON_FREE_INITMEM); |
2773fcc8 DC |
408 | } |
409 | ||
307cfe71 BH |
410 | #ifdef CONFIG_BLK_DEV_INITRD |
411 | void __init free_initrd_mem(unsigned long start, unsigned long end) | |
412 | { | |
dbe67df4 | 413 | free_reserved_area((void *)start, (void *)end, -1, "initrd"); |
307cfe71 BH |
414 | } |
415 | #endif | |
416 | ||
14cf11af PM |
417 | /* |
418 | * This is called when a page has been modified by the kernel. | |
419 | * It just marks the page as not i-cache clean. We do the i-cache | |
420 | * flush later when the page is given to a user process, if necessary. | |
421 | */ | |
422 | void flush_dcache_page(struct page *page) | |
423 | { | |
424 | if (cpu_has_feature(CPU_FTR_COHERENT_ICACHE)) | |
425 | return; | |
426 | /* avoid an atomic op if possible */ | |
427 | if (test_bit(PG_arch_1, &page->flags)) | |
428 | clear_bit(PG_arch_1, &page->flags); | |
429 | } | |
430 | EXPORT_SYMBOL(flush_dcache_page); | |
431 | ||
432 | void flush_dcache_icache_page(struct page *page) | |
433 | { | |
0895ecda DG |
434 | #ifdef CONFIG_HUGETLB_PAGE |
435 | if (PageCompound(page)) { | |
436 | flush_dcache_icache_hugepage(page); | |
437 | return; | |
438 | } | |
439 | #endif | |
968159c0 | 440 | #if defined(CONFIG_PPC_8xx) || defined(CONFIG_PPC64) |
2f7d2b74 SW |
441 | /* On 8xx there is no need to kmap since highmem is not supported */ |
442 | __flush_dcache_icache(page_address(page)); | |
443 | #else | |
444 | if (IS_ENABLED(CONFIG_BOOKE) || sizeof(phys_addr_t) > sizeof(void *)) { | |
2480b208 | 445 | void *start = kmap_atomic(page); |
0895ecda | 446 | __flush_dcache_icache(start); |
2480b208 | 447 | kunmap_atomic(start); |
2f7d2b74 SW |
448 | } else { |
449 | __flush_dcache_icache_phys(page_to_pfn(page) << PAGE_SHIFT); | |
0895ecda | 450 | } |
14cf11af | 451 | #endif |
14cf11af | 452 | } |
249ba1ee | 453 | EXPORT_SYMBOL(flush_dcache_icache_page); |
0895ecda | 454 | |
14cf11af PM |
455 | void clear_user_page(void *page, unsigned long vaddr, struct page *pg) |
456 | { | |
457 | clear_page(page); | |
458 | ||
14cf11af | 459 | /* |
25985edc | 460 | * We shouldn't have to do this, but some versions of glibc |
14cf11af PM |
461 | * require it (ld.so assumes zero filled pages are icache clean) |
462 | * - Anton | |
463 | */ | |
09f5dc44 | 464 | flush_dcache_page(pg); |
14cf11af PM |
465 | } |
466 | EXPORT_SYMBOL(clear_user_page); | |
467 | ||
468 | void copy_user_page(void *vto, void *vfrom, unsigned long vaddr, | |
469 | struct page *pg) | |
470 | { | |
471 | copy_page(vto, vfrom); | |
472 | ||
473 | /* | |
474 | * We should be able to use the following optimisation, however | |
475 | * there are two problems. | |
476 | * Firstly a bug in some versions of binutils meant PLT sections | |
477 | * were not marked executable. | |
478 | * Secondly the first word in the GOT section is blrl, used | |
479 | * to establish the GOT address. Until recently the GOT was | |
480 | * not marked executable. | |
481 | * - Anton | |
482 | */ | |
483 | #if 0 | |
484 | if (!vma->vm_file && ((vma->vm_flags & VM_EXEC) == 0)) | |
485 | return; | |
486 | #endif | |
487 | ||
09f5dc44 | 488 | flush_dcache_page(pg); |
14cf11af PM |
489 | } |
490 | ||
491 | void flush_icache_user_range(struct vm_area_struct *vma, struct page *page, | |
492 | unsigned long addr, int len) | |
493 | { | |
494 | unsigned long maddr; | |
495 | ||
496 | maddr = (unsigned long) kmap(page) + (addr & ~PAGE_MASK); | |
497 | flush_icache_range(maddr, maddr + len); | |
498 | kunmap(page); | |
499 | } | |
500 | EXPORT_SYMBOL(flush_icache_user_range); | |
501 | ||
502 | /* | |
503 | * This is called at the end of handling a user page fault, when the | |
504 | * fault has been handled by updating a PTE in the linux page tables. | |
505 | * We use it to preload an HPTE into the hash table corresponding to | |
506 | * the updated linux PTE. | |
507 | * | |
01edcd89 | 508 | * This must always be called with the pte lock held. |
14cf11af PM |
509 | */ |
510 | void update_mmu_cache(struct vm_area_struct *vma, unsigned long address, | |
4b3073e1 | 511 | pte_t *ptep) |
14cf11af | 512 | { |
3c726f8d | 513 | #ifdef CONFIG_PPC_STD_MMU |
0ac52dd7 AK |
514 | /* |
515 | * We don't need to worry about _PAGE_PRESENT here because we are | |
516 | * called with either mm->page_table_lock held or ptl lock held | |
517 | */ | |
171cb719 GS |
518 | unsigned long access, trap; |
519 | ||
a3dece6d AK |
520 | if (radix_enabled()) |
521 | return; | |
14cf11af | 522 | |
14cf11af | 523 | /* We only want HPTEs for linux PTEs that have _PAGE_ACCESSED set */ |
4b3073e1 | 524 | if (!pte_young(*ptep) || address >= TASK_SIZE) |
14cf11af | 525 | return; |
14cf11af | 526 | |
3c726f8d BH |
527 | /* We try to figure out if we are coming from an instruction |
528 | * access fault and pass that down to __hash_page so we avoid | |
529 | * double-faulting on execution of fresh text. We have to test | |
530 | * for regs NULL since init will get here first thing at boot | |
531 | * | |
532 | * We also avoid filling the hash if not coming from a fault | |
533 | */ | |
171cb719 GS |
534 | |
535 | trap = current->thread.regs ? TRAP(current->thread.regs) : 0UL; | |
536 | switch (trap) { | |
537 | case 0x300: | |
538 | access = 0UL; | |
539 | break; | |
540 | case 0x400: | |
541 | access = _PAGE_EXEC; | |
542 | break; | |
543 | default: | |
3c726f8d | 544 | return; |
171cb719 GS |
545 | } |
546 | ||
3c726f8d BH |
547 | hash_preload(vma->vm_mm, address, access, trap); |
548 | #endif /* CONFIG_PPC_STD_MMU */ | |
41151e77 BB |
549 | #if (defined(CONFIG_PPC_BOOK3E_64) || defined(CONFIG_PPC_FSL_BOOK3E)) \ |
550 | && defined(CONFIG_HUGETLB_PAGE) | |
551 | if (is_vm_hugetlb_page(vma)) | |
d93e4d7d | 552 | book3e_hugetlb_preload(vma, address, *ptep); |
41151e77 | 553 | #endif |
14cf11af | 554 | } |
c40dd2f7 AB |
555 | |
556 | /* | |
557 | * System memory should not be in /proc/iomem but various tools expect it | |
558 | * (eg kdump). | |
559 | */ | |
4f770924 | 560 | static int __init add_system_ram_resources(void) |
c40dd2f7 AB |
561 | { |
562 | struct memblock_region *reg; | |
563 | ||
564 | for_each_memblock(memory, reg) { | |
565 | struct resource *res; | |
566 | unsigned long base = reg->base; | |
567 | unsigned long size = reg->size; | |
568 | ||
569 | res = kzalloc(sizeof(struct resource), GFP_KERNEL); | |
570 | WARN_ON(!res); | |
571 | ||
572 | if (res) { | |
573 | res->name = "System RAM"; | |
574 | res->start = base; | |
575 | res->end = base + size - 1; | |
35d98e93 | 576 | res->flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY; |
c40dd2f7 AB |
577 | WARN_ON(request_resource(&iomem_resource, res) < 0); |
578 | } | |
579 | } | |
580 | ||
581 | return 0; | |
582 | } | |
583 | subsys_initcall(add_system_ram_resources); | |
1d54cf2b | 584 | |
585 | #ifdef CONFIG_STRICT_DEVMEM | |
586 | /* | |
587 | * devmem_is_allowed(): check to see if /dev/mem access to a certain address | |
588 | * is valid. The argument is a physical page number. | |
589 | * | |
590 | * Access has to be given to non-kernel-ram areas as well, these contain the | |
591 | * PCI mmio resources as well as potential bios/acpi data regions. | |
592 | */ | |
593 | int devmem_is_allowed(unsigned long pfn) | |
594 | { | |
e256caa7 VH |
595 | if (page_is_rtas_user_buf(pfn)) |
596 | return 1; | |
6c0cc627 | 597 | if (iomem_is_exclusive(PFN_PHYS(pfn))) |
1d54cf2b | 598 | return 0; |
599 | if (!page_is_ram(pfn)) | |
600 | return 1; | |
601 | return 0; | |
602 | } | |
603 | #endif /* CONFIG_STRICT_DEVMEM */ |