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> | |
57c8a661 | 30 | #include <linux/memblock.h> |
14cf11af PM |
31 | #include <linux/highmem.h> |
32 | #include <linux/initrd.h> | |
33 | #include <linux/pagemap.h> | |
4e8ad3e8 | 34 | #include <linux/suspend.h> |
0895ecda | 35 | #include <linux/hugetlb.h> |
c40dd2f7 | 36 | #include <linux/slab.h> |
16d0f5c4 | 37 | #include <linux/vmalloc.h> |
b584c254 | 38 | #include <linux/memremap.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; |
51c3c62b | 65 | bool init_mem_is_free; |
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 | ||
8b150478 | 80 | pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn, |
14cf11af PM |
81 | unsigned long size, pgprot_t vma_prot) |
82 | { | |
83 | if (ppc_md.phys_mem_access_prot) | |
8b150478 | 84 | return ppc_md.phys_mem_access_prot(file, pfn, size, vma_prot); |
14cf11af | 85 | |
8b150478 | 86 | if (!page_is_ram(pfn)) |
64b3d0e8 BH |
87 | vma_prot = pgprot_noncached(vma_prot); |
88 | ||
14cf11af PM |
89 | return vma_prot; |
90 | } | |
91 | EXPORT_SYMBOL(phys_mem_access_prot); | |
92 | ||
23fd0775 PM |
93 | #ifdef CONFIG_MEMORY_HOTPLUG |
94 | ||
bc02af93 YG |
95 | #ifdef CONFIG_NUMA |
96 | int memory_add_physaddr_to_nid(u64 start) | |
97 | { | |
98 | return hot_add_scn_to_nid(start); | |
99 | } | |
100 | #endif | |
101 | ||
29ab6c47 | 102 | int __weak create_section_mapping(unsigned long start, unsigned long end, int nid) |
fecbfabe BH |
103 | { |
104 | return -ENODEV; | |
105 | } | |
106 | ||
107 | int __weak remove_section_mapping(unsigned long start, unsigned long end) | |
108 | { | |
109 | return -ENODEV; | |
110 | } | |
111 | ||
bde709a7 | 112 | int __meminit arch_add_memory(int nid, u64 start, u64 size, struct vmem_altmap *altmap, |
24e6d5a5 | 113 | bool want_memblock) |
23fd0775 | 114 | { |
23fd0775 PM |
115 | unsigned long start_pfn = start >> PAGE_SHIFT; |
116 | unsigned long nr_pages = size >> PAGE_SHIFT; | |
1dace6c6 | 117 | int rc; |
23fd0775 | 118 | |
438cc81a DG |
119 | resize_hpt_for_hotplug(memblock_phys_mem_size()); |
120 | ||
2d0eee14 | 121 | start = (unsigned long)__va(start); |
29ab6c47 | 122 | rc = create_section_mapping(start, start + size, nid); |
1dace6c6 | 123 | if (rc) { |
f2c2cbcc | 124 | pr_warn("Unable to create mapping for hot added memory 0x%llx..0x%llx: %d\n", |
1dace6c6 DG |
125 | start, start + size, rc); |
126 | return -EFAULT; | |
127 | } | |
fb5924fd | 128 | flush_inval_dcache_range(start, start + size); |
54b79248 | 129 | |
24e6d5a5 | 130 | return __add_pages(nid, start_pfn, nr_pages, altmap, want_memblock); |
23fd0775 | 131 | } |
24d335ca WC |
132 | |
133 | #ifdef CONFIG_MEMORY_HOTREMOVE | |
2c2a5af6 OS |
134 | int __meminit arch_remove_memory(int nid, u64 start, u64 size, |
135 | struct vmem_altmap *altmap) | |
24d335ca WC |
136 | { |
137 | unsigned long start_pfn = start >> PAGE_SHIFT; | |
138 | unsigned long nr_pages = size >> PAGE_SHIFT; | |
b584c254 | 139 | struct page *page; |
9ac8cde9 | 140 | int ret; |
24d335ca | 141 | |
b584c254 OH |
142 | /* |
143 | * If we have an altmap then we need to skip over any reserved PFNs | |
144 | * when querying the zone. | |
145 | */ | |
146 | page = pfn_to_page(start_pfn); | |
b584c254 OH |
147 | if (altmap) |
148 | page += vmem_altmap_offset(altmap); | |
149 | ||
da024512 | 150 | ret = __remove_pages(page_zone(page), start_pfn, nr_pages, altmap); |
16d0f5c4 AB |
151 | if (ret) |
152 | return ret; | |
153 | ||
154 | /* Remove htab bolted mappings for this section of memory */ | |
155 | start = (unsigned long)__va(start); | |
fb5924fd | 156 | flush_inval_dcache_range(start, start + size); |
16d0f5c4 AB |
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 | 163 | |
f172acbf LV |
164 | if (resize_hpt_for_hotplug(memblock_phys_mem_size()) == -ENOSPC) |
165 | pr_warn("Hash collision while resizing HPT\n"); | |
438cc81a | 166 | |
9ac8cde9 | 167 | return ret; |
24d335ca WC |
168 | } |
169 | #endif | |
0d579944 | 170 | #endif /* CONFIG_MEMORY_HOTPLUG */ |
a99824f3 | 171 | |
7c8c6b97 | 172 | #ifndef CONFIG_NEED_MULTIPLE_NODES |
9bd9be00 | 173 | void __init mem_topology_setup(void) |
7c8c6b97 | 174 | { |
95f72d1e | 175 | max_low_pfn = max_pfn = memblock_end_of_DRAM() >> PAGE_SHIFT; |
10239733 | 176 | min_low_pfn = MEMORY_START >> PAGE_SHIFT; |
7c8c6b97 | 177 | #ifdef CONFIG_HIGHMEM |
d7917ba7 | 178 | max_low_pfn = lowmem_end_addr >> PAGE_SHIFT; |
7c8c6b97 PM |
179 | #endif |
180 | ||
4e8309ba CS |
181 | /* Place all memblock_regions in the same node and merge contiguous |
182 | * memblock_regions | |
183 | */ | |
d7dc899a | 184 | memblock_set_node(0, PHYS_ADDR_MAX, &memblock.memory, 0); |
9bd9be00 | 185 | } |
c67c3cb4 | 186 | |
9bd9be00 NP |
187 | void __init initmem_init(void) |
188 | { | |
7c8c6b97 | 189 | /* XXX need to clip this if using highmem? */ |
c67c3cb4 | 190 | sparse_memory_present_with_active_regions(0); |
21098b9e | 191 | sparse_init(); |
7c8c6b97 PM |
192 | } |
193 | ||
4e8ad3e8 JB |
194 | /* mark pages that don't exist as nosave */ |
195 | static int __init mark_nonram_nosave(void) | |
196 | { | |
28be7072 BH |
197 | struct memblock_region *reg, *prev = NULL; |
198 | ||
199 | for_each_memblock(memory, reg) { | |
200 | if (prev && | |
c7fc2de0 YL |
201 | memblock_region_memory_end_pfn(prev) < memblock_region_memory_base_pfn(reg)) |
202 | register_nosave_region(memblock_region_memory_end_pfn(prev), | |
203 | memblock_region_memory_base_pfn(reg)); | |
28be7072 | 204 | prev = reg; |
4e8ad3e8 | 205 | } |
4e8ad3e8 JB |
206 | return 0; |
207 | } | |
6db35ad2 SW |
208 | #else /* CONFIG_NEED_MULTIPLE_NODES */ |
209 | static int __init mark_nonram_nosave(void) | |
210 | { | |
211 | return 0; | |
212 | } | |
213 | #endif | |
4e8ad3e8 | 214 | |
1c98025c | 215 | /* |
25078dc1 CH |
216 | * Zones usage: |
217 | * | |
218 | * We setup ZONE_DMA to be 31-bits on all platforms and ZONE_NORMAL to be | |
219 | * everything else. GFP_DMA32 page allocations automatically fall back to | |
220 | * ZONE_DMA. | |
221 | * | |
222 | * By using 31-bit unconditionally, we can exploit ARCH_ZONE_DMA_BITS to | |
223 | * inform the generic DMA mapping code. 32-bit only devices (if not handled | |
224 | * by an IOMMU anyway) will take a first dip into ZONE_NORMAL and get | |
225 | * otherwise served by ZONE_DMA. | |
1c98025c | 226 | */ |
25078dc1 | 227 | static unsigned long max_zone_pfns[MAX_NR_ZONES]; |
1c98025c | 228 | |
7c8c6b97 PM |
229 | /* |
230 | * paging_init() sets up the page tables - in fact we've already done this. | |
231 | */ | |
232 | void __init paging_init(void) | |
233 | { | |
f7ba2991 | 234 | unsigned long long total_ram = memblock_phys_mem_size(); |
95f72d1e | 235 | phys_addr_t top_of_ram = memblock_end_of_DRAM(); |
7c8c6b97 | 236 | |
2c419bde KG |
237 | #ifdef CONFIG_PPC32 |
238 | unsigned long v = __fix_to_virt(__end_of_fixed_addresses - 1); | |
239 | unsigned long end = __fix_to_virt(FIX_HOLE); | |
240 | ||
241 | for (; v < end; v += PAGE_SIZE) | |
c766ee72 | 242 | map_kernel_page(v, 0, __pgprot(0)); /* XXX gross */ |
2c419bde KG |
243 | #endif |
244 | ||
7c8c6b97 | 245 | #ifdef CONFIG_HIGHMEM |
c766ee72 | 246 | map_kernel_page(PKMAP_BASE, 0, __pgprot(0)); /* XXX gross */ |
2c419bde KG |
247 | pkmap_page_table = virt_to_kpte(PKMAP_BASE); |
248 | ||
249 | kmap_pte = virt_to_kpte(__fix_to_virt(FIX_KMAP_BEGIN)); | |
7c8c6b97 PM |
250 | kmap_prot = PAGE_KERNEL; |
251 | #endif /* CONFIG_HIGHMEM */ | |
252 | ||
f7ba2991 | 253 | printk(KERN_DEBUG "Top of RAM: 0x%llx, Total RAM: 0x%llx\n", |
fb610635 | 254 | (unsigned long long)top_of_ram, total_ram); |
e110b281 | 255 | printk(KERN_DEBUG "Memory hole size: %ldMB\n", |
2bf3016f | 256 | (long int)((top_of_ram - total_ram) >> 20)); |
1c98025c | 257 | |
25078dc1 CH |
258 | #ifdef CONFIG_ZONE_DMA |
259 | max_zone_pfns[ZONE_DMA] = min(max_low_pfn, 0x7fffffffUL >> PAGE_SHIFT); | |
260 | #endif | |
261 | max_zone_pfns[ZONE_NORMAL] = max_low_pfn; | |
7c8c6b97 | 262 | #ifdef CONFIG_HIGHMEM |
25078dc1 | 263 | max_zone_pfns[ZONE_HIGHMEM] = max_pfn; |
c67c3cb4 | 264 | #endif |
25078dc1 | 265 | |
c67c3cb4 | 266 | free_area_init_nodes(max_zone_pfns); |
4e8ad3e8 JB |
267 | |
268 | mark_nonram_nosave(); | |
7c8c6b97 | 269 | } |
7c8c6b97 PM |
270 | |
271 | void __init mem_init(void) | |
272 | { | |
28efc35f SW |
273 | /* |
274 | * book3s is limited to 16 page sizes due to encoding this in | |
275 | * a 4-bit field for slices. | |
276 | */ | |
277 | BUILD_BUG_ON(MMU_PAGE_COUNT > 16); | |
278 | ||
a9327296 | 279 | #ifdef CONFIG_SWIOTLB |
688ba1db | 280 | swiotlb_init(0); |
a9327296 FT |
281 | #endif |
282 | ||
7c8c6b97 | 283 | high_memory = (void *) __va(max_low_pfn * PAGE_SIZE); |
602ddc70 | 284 | set_max_mapnr(max_pfn); |
c6ffc5ca | 285 | memblock_free_all(); |
7c8c6b97 PM |
286 | |
287 | #ifdef CONFIG_HIGHMEM | |
288 | { | |
289 | unsigned long pfn, highmem_mapnr; | |
290 | ||
d7917ba7 | 291 | highmem_mapnr = lowmem_end_addr >> PAGE_SHIFT; |
7c8c6b97 | 292 | for (pfn = highmem_mapnr; pfn < max_mapnr; ++pfn) { |
3d41e0f6 | 293 | phys_addr_t paddr = (phys_addr_t)pfn << PAGE_SHIFT; |
7c8c6b97 | 294 | struct page *page = pfn_to_page(pfn); |
369a9d85 JL |
295 | if (!memblock_is_reserved(paddr)) |
296 | free_highmem_page(page); | |
7c8c6b97 | 297 | } |
7c8c6b97 PM |
298 | } |
299 | #endif /* CONFIG_HIGHMEM */ | |
300 | ||
3160b097 BB |
301 | #if defined(CONFIG_PPC_FSL_BOOK3E) && !defined(CONFIG_SMP) |
302 | /* | |
303 | * If smp is enabled, next_tlbcam_idx is initialized in the cpu up | |
304 | * functions.... do it here for the non-smp case. | |
305 | */ | |
306 | per_cpu(next_tlbcam_idx, smp_processor_id()) = | |
307 | (mfspr(SPRN_TLB1CFG) & TLBnCFG_N_ENTRY) - 1; | |
308 | #endif | |
309 | ||
369a9d85 | 310 | mem_init_print_info(NULL); |
f637a49e BH |
311 | #ifdef CONFIG_PPC32 |
312 | pr_info("Kernel virtual memory layout:\n"); | |
313 | pr_info(" * 0x%08lx..0x%08lx : fixmap\n", FIXADDR_START, FIXADDR_TOP); | |
314 | #ifdef CONFIG_HIGHMEM | |
315 | pr_info(" * 0x%08lx..0x%08lx : highmem PTEs\n", | |
316 | PKMAP_BASE, PKMAP_ADDR(LAST_PKMAP)); | |
317 | #endif /* CONFIG_HIGHMEM */ | |
8b31e49d BH |
318 | #ifdef CONFIG_NOT_COHERENT_CACHE |
319 | pr_info(" * 0x%08lx..0x%08lx : consistent mem\n", | |
320 | IOREMAP_TOP, IOREMAP_TOP + CONFIG_CONSISTENT_SIZE); | |
321 | #endif /* CONFIG_NOT_COHERENT_CACHE */ | |
f637a49e BH |
322 | pr_info(" * 0x%08lx..0x%08lx : early ioremap\n", |
323 | ioremap_bot, IOREMAP_TOP); | |
324 | pr_info(" * 0x%08lx..0x%08lx : vmalloc & ioremap\n", | |
325 | VMALLOC_START, VMALLOC_END); | |
326 | #endif /* CONFIG_PPC32 */ | |
7c8c6b97 PM |
327 | } |
328 | ||
2773fcc8 DC |
329 | void free_initmem(void) |
330 | { | |
a9c0f41b | 331 | ppc_md.progress = ppc_printk_progress; |
029d9252 | 332 | mark_initmem_nx(); |
51c3c62b | 333 | init_mem_is_free = true; |
5d585e5c | 334 | free_initmem_default(POISON_FREE_INITMEM); |
2773fcc8 DC |
335 | } |
336 | ||
307cfe71 BH |
337 | #ifdef CONFIG_BLK_DEV_INITRD |
338 | void __init free_initrd_mem(unsigned long start, unsigned long end) | |
339 | { | |
dbe67df4 | 340 | free_reserved_area((void *)start, (void *)end, -1, "initrd"); |
307cfe71 BH |
341 | } |
342 | #endif | |
343 | ||
14cf11af PM |
344 | /* |
345 | * This is called when a page has been modified by the kernel. | |
346 | * It just marks the page as not i-cache clean. We do the i-cache | |
347 | * flush later when the page is given to a user process, if necessary. | |
348 | */ | |
349 | void flush_dcache_page(struct page *page) | |
350 | { | |
351 | if (cpu_has_feature(CPU_FTR_COHERENT_ICACHE)) | |
352 | return; | |
353 | /* avoid an atomic op if possible */ | |
354 | if (test_bit(PG_arch_1, &page->flags)) | |
355 | clear_bit(PG_arch_1, &page->flags); | |
356 | } | |
357 | EXPORT_SYMBOL(flush_dcache_page); | |
358 | ||
359 | void flush_dcache_icache_page(struct page *page) | |
360 | { | |
0895ecda DG |
361 | #ifdef CONFIG_HUGETLB_PAGE |
362 | if (PageCompound(page)) { | |
363 | flush_dcache_icache_hugepage(page); | |
364 | return; | |
365 | } | |
366 | #endif | |
968159c0 | 367 | #if defined(CONFIG_PPC_8xx) || defined(CONFIG_PPC64) |
2f7d2b74 SW |
368 | /* On 8xx there is no need to kmap since highmem is not supported */ |
369 | __flush_dcache_icache(page_address(page)); | |
370 | #else | |
371 | if (IS_ENABLED(CONFIG_BOOKE) || sizeof(phys_addr_t) > sizeof(void *)) { | |
2480b208 | 372 | void *start = kmap_atomic(page); |
0895ecda | 373 | __flush_dcache_icache(start); |
2480b208 | 374 | kunmap_atomic(start); |
2f7d2b74 SW |
375 | } else { |
376 | __flush_dcache_icache_phys(page_to_pfn(page) << PAGE_SHIFT); | |
0895ecda | 377 | } |
14cf11af | 378 | #endif |
14cf11af | 379 | } |
249ba1ee | 380 | EXPORT_SYMBOL(flush_dcache_icache_page); |
0895ecda | 381 | |
14cf11af PM |
382 | void clear_user_page(void *page, unsigned long vaddr, struct page *pg) |
383 | { | |
384 | clear_page(page); | |
385 | ||
14cf11af | 386 | /* |
25985edc | 387 | * We shouldn't have to do this, but some versions of glibc |
14cf11af PM |
388 | * require it (ld.so assumes zero filled pages are icache clean) |
389 | * - Anton | |
390 | */ | |
09f5dc44 | 391 | flush_dcache_page(pg); |
14cf11af PM |
392 | } |
393 | EXPORT_SYMBOL(clear_user_page); | |
394 | ||
395 | void copy_user_page(void *vto, void *vfrom, unsigned long vaddr, | |
396 | struct page *pg) | |
397 | { | |
398 | copy_page(vto, vfrom); | |
399 | ||
400 | /* | |
401 | * We should be able to use the following optimisation, however | |
402 | * there are two problems. | |
403 | * Firstly a bug in some versions of binutils meant PLT sections | |
404 | * were not marked executable. | |
405 | * Secondly the first word in the GOT section is blrl, used | |
406 | * to establish the GOT address. Until recently the GOT was | |
407 | * not marked executable. | |
408 | * - Anton | |
409 | */ | |
410 | #if 0 | |
411 | if (!vma->vm_file && ((vma->vm_flags & VM_EXEC) == 0)) | |
412 | return; | |
413 | #endif | |
414 | ||
09f5dc44 | 415 | flush_dcache_page(pg); |
14cf11af PM |
416 | } |
417 | ||
418 | void flush_icache_user_range(struct vm_area_struct *vma, struct page *page, | |
419 | unsigned long addr, int len) | |
420 | { | |
421 | unsigned long maddr; | |
422 | ||
423 | maddr = (unsigned long) kmap(page) + (addr & ~PAGE_MASK); | |
424 | flush_icache_range(maddr, maddr + len); | |
425 | kunmap(page); | |
426 | } | |
427 | EXPORT_SYMBOL(flush_icache_user_range); | |
428 | ||
429 | /* | |
430 | * This is called at the end of handling a user page fault, when the | |
431 | * fault has been handled by updating a PTE in the linux page tables. | |
432 | * We use it to preload an HPTE into the hash table corresponding to | |
433 | * the updated linux PTE. | |
434 | * | |
01edcd89 | 435 | * This must always be called with the pte lock held. |
14cf11af PM |
436 | */ |
437 | void update_mmu_cache(struct vm_area_struct *vma, unsigned long address, | |
4b3073e1 | 438 | pte_t *ptep) |
14cf11af | 439 | { |
5b3e84fc | 440 | #ifdef CONFIG_PPC_BOOK3S |
0ac52dd7 AK |
441 | /* |
442 | * We don't need to worry about _PAGE_PRESENT here because we are | |
443 | * called with either mm->page_table_lock held or ptl lock held | |
444 | */ | |
34eb138e CL |
445 | unsigned long trap; |
446 | bool is_exec; | |
171cb719 | 447 | |
68662f85 NP |
448 | if (radix_enabled()) { |
449 | prefetch((void *)address); | |
a3dece6d | 450 | return; |
68662f85 | 451 | } |
14cf11af | 452 | |
14cf11af | 453 | /* We only want HPTEs for linux PTEs that have _PAGE_ACCESSED set */ |
4b3073e1 | 454 | if (!pte_young(*ptep) || address >= TASK_SIZE) |
14cf11af | 455 | return; |
14cf11af | 456 | |
3c726f8d BH |
457 | /* We try to figure out if we are coming from an instruction |
458 | * access fault and pass that down to __hash_page so we avoid | |
459 | * double-faulting on execution of fresh text. We have to test | |
460 | * for regs NULL since init will get here first thing at boot | |
461 | * | |
462 | * We also avoid filling the hash if not coming from a fault | |
463 | */ | |
171cb719 GS |
464 | |
465 | trap = current->thread.regs ? TRAP(current->thread.regs) : 0UL; | |
466 | switch (trap) { | |
467 | case 0x300: | |
34eb138e | 468 | is_exec = false; |
171cb719 GS |
469 | break; |
470 | case 0x400: | |
34eb138e | 471 | is_exec = true; |
171cb719 GS |
472 | break; |
473 | default: | |
3c726f8d | 474 | return; |
171cb719 GS |
475 | } |
476 | ||
34eb138e | 477 | hash_preload(vma->vm_mm, address, is_exec, trap); |
5b3e84fc | 478 | #endif /* CONFIG_PPC_BOOK3S */ |
41151e77 BB |
479 | #if (defined(CONFIG_PPC_BOOK3E_64) || defined(CONFIG_PPC_FSL_BOOK3E)) \ |
480 | && defined(CONFIG_HUGETLB_PAGE) | |
481 | if (is_vm_hugetlb_page(vma)) | |
d93e4d7d | 482 | book3e_hugetlb_preload(vma, address, *ptep); |
41151e77 | 483 | #endif |
14cf11af | 484 | } |
c40dd2f7 AB |
485 | |
486 | /* | |
487 | * System memory should not be in /proc/iomem but various tools expect it | |
488 | * (eg kdump). | |
489 | */ | |
4f770924 | 490 | static int __init add_system_ram_resources(void) |
c40dd2f7 AB |
491 | { |
492 | struct memblock_region *reg; | |
493 | ||
494 | for_each_memblock(memory, reg) { | |
495 | struct resource *res; | |
496 | unsigned long base = reg->base; | |
497 | unsigned long size = reg->size; | |
498 | ||
499 | res = kzalloc(sizeof(struct resource), GFP_KERNEL); | |
500 | WARN_ON(!res); | |
501 | ||
502 | if (res) { | |
503 | res->name = "System RAM"; | |
504 | res->start = base; | |
505 | res->end = base + size - 1; | |
35d98e93 | 506 | res->flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY; |
c40dd2f7 AB |
507 | WARN_ON(request_resource(&iomem_resource, res) < 0); |
508 | } | |
509 | } | |
510 | ||
511 | return 0; | |
512 | } | |
513 | subsys_initcall(add_system_ram_resources); | |
1d54cf2b | 514 | |
515 | #ifdef CONFIG_STRICT_DEVMEM | |
516 | /* | |
517 | * devmem_is_allowed(): check to see if /dev/mem access to a certain address | |
518 | * is valid. The argument is a physical page number. | |
519 | * | |
520 | * Access has to be given to non-kernel-ram areas as well, these contain the | |
521 | * PCI mmio resources as well as potential bios/acpi data regions. | |
522 | */ | |
523 | int devmem_is_allowed(unsigned long pfn) | |
524 | { | |
e256caa7 VH |
525 | if (page_is_rtas_user_buf(pfn)) |
526 | return 1; | |
6c0cc627 | 527 | if (iomem_is_exclusive(PFN_PHYS(pfn))) |
1d54cf2b | 528 | return 0; |
529 | if (!page_is_ram(pfn)) | |
530 | return 1; | |
531 | return 0; | |
532 | } | |
533 | #endif /* CONFIG_STRICT_DEVMEM */ | |
26b52335 CL |
534 | |
535 | /* | |
536 | * This is defined in kernel/resource.c but only powerpc needs to export it, for | |
537 | * the EHEA driver. Drop this when drivers/net/ethernet/ibm/ehea is removed. | |
538 | */ | |
539 | EXPORT_SYMBOL_GPL(walk_system_ram_range); |