Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * linux/arch/x86_64/mm/init.c | |
3 | * | |
4 | * Copyright (C) 1995 Linus Torvalds | |
5 | * Copyright (C) 2000 Pavel Machek <pavel@suse.cz> | |
6 | * Copyright (C) 2002,2003 Andi Kleen <ak@suse.de> | |
7 | */ | |
8 | ||
9 | #include <linux/config.h> | |
10 | #include <linux/signal.h> | |
11 | #include <linux/sched.h> | |
12 | #include <linux/kernel.h> | |
13 | #include <linux/errno.h> | |
14 | #include <linux/string.h> | |
15 | #include <linux/types.h> | |
16 | #include <linux/ptrace.h> | |
17 | #include <linux/mman.h> | |
18 | #include <linux/mm.h> | |
19 | #include <linux/swap.h> | |
20 | #include <linux/smp.h> | |
21 | #include <linux/init.h> | |
22 | #include <linux/pagemap.h> | |
23 | #include <linux/bootmem.h> | |
24 | #include <linux/proc_fs.h> | |
59170891 | 25 | #include <linux/pci.h> |
17a941d8 | 26 | #include <linux/dma-mapping.h> |
44df75e6 MT |
27 | #include <linux/module.h> |
28 | #include <linux/memory_hotplug.h> | |
1da177e4 LT |
29 | |
30 | #include <asm/processor.h> | |
31 | #include <asm/system.h> | |
32 | #include <asm/uaccess.h> | |
33 | #include <asm/pgtable.h> | |
34 | #include <asm/pgalloc.h> | |
35 | #include <asm/dma.h> | |
36 | #include <asm/fixmap.h> | |
37 | #include <asm/e820.h> | |
38 | #include <asm/apic.h> | |
39 | #include <asm/tlb.h> | |
40 | #include <asm/mmu_context.h> | |
41 | #include <asm/proto.h> | |
42 | #include <asm/smp.h> | |
2bc0414e | 43 | #include <asm/sections.h> |
17a941d8 MBY |
44 | #include <asm/dma-mapping.h> |
45 | #include <asm/swiotlb.h> | |
1da177e4 LT |
46 | |
47 | #ifndef Dprintk | |
48 | #define Dprintk(x...) | |
49 | #endif | |
50 | ||
17a941d8 MBY |
51 | struct dma_mapping_ops* dma_ops; |
52 | EXPORT_SYMBOL(dma_ops); | |
53 | ||
e18c6874 AK |
54 | static unsigned long dma_reserve __initdata; |
55 | ||
1da177e4 LT |
56 | DEFINE_PER_CPU(struct mmu_gather, mmu_gathers); |
57 | ||
58 | /* | |
59 | * NOTE: pagetable_init alloc all the fixmap pagetables contiguous on the | |
60 | * physical space so we can cache the place of the first one and move | |
61 | * around without checking the pgd every time. | |
62 | */ | |
63 | ||
64 | void show_mem(void) | |
65 | { | |
e92343cc AK |
66 | long i, total = 0, reserved = 0; |
67 | long shared = 0, cached = 0; | |
1da177e4 LT |
68 | pg_data_t *pgdat; |
69 | struct page *page; | |
70 | ||
e92343cc | 71 | printk(KERN_INFO "Mem-info:\n"); |
1da177e4 | 72 | show_free_areas(); |
e92343cc | 73 | printk(KERN_INFO "Free swap: %6ldkB\n", nr_swap_pages<<(PAGE_SHIFT-10)); |
1da177e4 LT |
74 | |
75 | for_each_pgdat(pgdat) { | |
76 | for (i = 0; i < pgdat->node_spanned_pages; ++i) { | |
77 | page = pfn_to_page(pgdat->node_start_pfn + i); | |
78 | total++; | |
e92343cc AK |
79 | if (PageReserved(page)) |
80 | reserved++; | |
81 | else if (PageSwapCache(page)) | |
82 | cached++; | |
83 | else if (page_count(page)) | |
84 | shared += page_count(page) - 1; | |
1da177e4 LT |
85 | } |
86 | } | |
e92343cc AK |
87 | printk(KERN_INFO "%lu pages of RAM\n", total); |
88 | printk(KERN_INFO "%lu reserved pages\n",reserved); | |
89 | printk(KERN_INFO "%lu pages shared\n",shared); | |
90 | printk(KERN_INFO "%lu pages swap cached\n",cached); | |
1da177e4 LT |
91 | } |
92 | ||
93 | /* References to section boundaries */ | |
94 | ||
1da177e4 LT |
95 | int after_bootmem; |
96 | ||
97 | static void *spp_getpage(void) | |
98 | { | |
99 | void *ptr; | |
100 | if (after_bootmem) | |
101 | ptr = (void *) get_zeroed_page(GFP_ATOMIC); | |
102 | else | |
103 | ptr = alloc_bootmem_pages(PAGE_SIZE); | |
104 | if (!ptr || ((unsigned long)ptr & ~PAGE_MASK)) | |
105 | panic("set_pte_phys: cannot allocate page data %s\n", after_bootmem?"after bootmem":""); | |
106 | ||
107 | Dprintk("spp_getpage %p\n", ptr); | |
108 | return ptr; | |
109 | } | |
110 | ||
111 | static void set_pte_phys(unsigned long vaddr, | |
112 | unsigned long phys, pgprot_t prot) | |
113 | { | |
114 | pgd_t *pgd; | |
115 | pud_t *pud; | |
116 | pmd_t *pmd; | |
117 | pte_t *pte, new_pte; | |
118 | ||
119 | Dprintk("set_pte_phys %lx to %lx\n", vaddr, phys); | |
120 | ||
121 | pgd = pgd_offset_k(vaddr); | |
122 | if (pgd_none(*pgd)) { | |
123 | printk("PGD FIXMAP MISSING, it should be setup in head.S!\n"); | |
124 | return; | |
125 | } | |
126 | pud = pud_offset(pgd, vaddr); | |
127 | if (pud_none(*pud)) { | |
128 | pmd = (pmd_t *) spp_getpage(); | |
129 | set_pud(pud, __pud(__pa(pmd) | _KERNPG_TABLE | _PAGE_USER)); | |
130 | if (pmd != pmd_offset(pud, 0)) { | |
131 | printk("PAGETABLE BUG #01! %p <-> %p\n", pmd, pmd_offset(pud,0)); | |
132 | return; | |
133 | } | |
134 | } | |
135 | pmd = pmd_offset(pud, vaddr); | |
136 | if (pmd_none(*pmd)) { | |
137 | pte = (pte_t *) spp_getpage(); | |
138 | set_pmd(pmd, __pmd(__pa(pte) | _KERNPG_TABLE | _PAGE_USER)); | |
139 | if (pte != pte_offset_kernel(pmd, 0)) { | |
140 | printk("PAGETABLE BUG #02!\n"); | |
141 | return; | |
142 | } | |
143 | } | |
144 | new_pte = pfn_pte(phys >> PAGE_SHIFT, prot); | |
145 | ||
146 | pte = pte_offset_kernel(pmd, vaddr); | |
147 | if (!pte_none(*pte) && | |
148 | pte_val(*pte) != (pte_val(new_pte) & __supported_pte_mask)) | |
149 | pte_ERROR(*pte); | |
150 | set_pte(pte, new_pte); | |
151 | ||
152 | /* | |
153 | * It's enough to flush this one mapping. | |
154 | * (PGE mappings get flushed as well) | |
155 | */ | |
156 | __flush_tlb_one(vaddr); | |
157 | } | |
158 | ||
159 | /* NOTE: this is meant to be run only at boot */ | |
160 | void __set_fixmap (enum fixed_addresses idx, unsigned long phys, pgprot_t prot) | |
161 | { | |
162 | unsigned long address = __fix_to_virt(idx); | |
163 | ||
164 | if (idx >= __end_of_fixed_addresses) { | |
165 | printk("Invalid __set_fixmap\n"); | |
166 | return; | |
167 | } | |
168 | set_pte_phys(address, phys, prot); | |
169 | } | |
170 | ||
171 | unsigned long __initdata table_start, table_end; | |
172 | ||
173 | extern pmd_t temp_boot_pmds[]; | |
174 | ||
175 | static struct temp_map { | |
176 | pmd_t *pmd; | |
177 | void *address; | |
178 | int allocated; | |
179 | } temp_mappings[] __initdata = { | |
180 | { &temp_boot_pmds[0], (void *)(40UL * 1024 * 1024) }, | |
181 | { &temp_boot_pmds[1], (void *)(42UL * 1024 * 1024) }, | |
182 | {} | |
183 | }; | |
184 | ||
44df75e6 | 185 | static __meminit void *alloc_low_page(int *index, unsigned long *phys) |
1da177e4 LT |
186 | { |
187 | struct temp_map *ti; | |
188 | int i; | |
189 | unsigned long pfn = table_end++, paddr; | |
190 | void *adr; | |
191 | ||
44df75e6 MT |
192 | if (after_bootmem) { |
193 | adr = (void *)get_zeroed_page(GFP_ATOMIC); | |
194 | *phys = __pa(adr); | |
195 | return adr; | |
196 | } | |
197 | ||
1da177e4 LT |
198 | if (pfn >= end_pfn) |
199 | panic("alloc_low_page: ran out of memory"); | |
200 | for (i = 0; temp_mappings[i].allocated; i++) { | |
201 | if (!temp_mappings[i].pmd) | |
202 | panic("alloc_low_page: ran out of temp mappings"); | |
203 | } | |
204 | ti = &temp_mappings[i]; | |
205 | paddr = (pfn << PAGE_SHIFT) & PMD_MASK; | |
206 | set_pmd(ti->pmd, __pmd(paddr | _KERNPG_TABLE | _PAGE_PSE)); | |
207 | ti->allocated = 1; | |
208 | __flush_tlb(); | |
209 | adr = ti->address + ((pfn << PAGE_SHIFT) & ~PMD_MASK); | |
44df75e6 | 210 | memset(adr, 0, PAGE_SIZE); |
1da177e4 LT |
211 | *index = i; |
212 | *phys = pfn * PAGE_SIZE; | |
213 | return adr; | |
214 | } | |
215 | ||
44df75e6 | 216 | static __meminit void unmap_low_page(int i) |
1da177e4 | 217 | { |
44df75e6 MT |
218 | struct temp_map *ti; |
219 | ||
220 | if (after_bootmem) | |
221 | return; | |
222 | ||
223 | ti = &temp_mappings[i]; | |
1da177e4 LT |
224 | set_pmd(ti->pmd, __pmd(0)); |
225 | ti->allocated = 0; | |
226 | } | |
227 | ||
44df75e6 MT |
228 | static void __meminit |
229 | phys_pmd_init(pmd_t *pmd, unsigned long address, unsigned long end) | |
230 | { | |
231 | int i; | |
232 | ||
233 | for (i = 0; i < PTRS_PER_PMD; pmd++, i++, address += PMD_SIZE) { | |
234 | unsigned long entry; | |
235 | ||
236 | if (address > end) { | |
237 | for (; i < PTRS_PER_PMD; i++, pmd++) | |
238 | set_pmd(pmd, __pmd(0)); | |
239 | break; | |
240 | } | |
241 | entry = _PAGE_NX|_PAGE_PSE|_KERNPG_TABLE|_PAGE_GLOBAL|address; | |
242 | entry &= __supported_pte_mask; | |
243 | set_pmd(pmd, __pmd(entry)); | |
244 | } | |
245 | } | |
246 | ||
247 | static void __meminit | |
248 | phys_pmd_update(pud_t *pud, unsigned long address, unsigned long end) | |
249 | { | |
250 | pmd_t *pmd = pmd_offset(pud, (unsigned long)__va(address)); | |
251 | ||
252 | if (pmd_none(*pmd)) { | |
253 | spin_lock(&init_mm.page_table_lock); | |
254 | phys_pmd_init(pmd, address, end); | |
255 | spin_unlock(&init_mm.page_table_lock); | |
256 | __flush_tlb_all(); | |
257 | } | |
258 | } | |
259 | ||
260 | static void __meminit phys_pud_init(pud_t *pud, unsigned long address, unsigned long end) | |
1da177e4 | 261 | { |
44df75e6 | 262 | long i = pud_index(address); |
1da177e4 | 263 | |
1da177e4 | 264 | pud = pud + i; |
44df75e6 MT |
265 | |
266 | if (after_bootmem && pud_val(*pud)) { | |
267 | phys_pmd_update(pud, address, end); | |
268 | return; | |
269 | } | |
270 | ||
1da177e4 LT |
271 | for (; i < PTRS_PER_PUD; pud++, i++) { |
272 | int map; | |
273 | unsigned long paddr, pmd_phys; | |
274 | pmd_t *pmd; | |
275 | ||
44df75e6 MT |
276 | paddr = (address & PGDIR_MASK) + i*PUD_SIZE; |
277 | if (paddr >= end) | |
1da177e4 | 278 | break; |
1da177e4 | 279 | |
44df75e6 | 280 | if (!after_bootmem && !e820_mapped(paddr, paddr+PUD_SIZE, 0)) { |
1da177e4 LT |
281 | set_pud(pud, __pud(0)); |
282 | continue; | |
283 | } | |
284 | ||
285 | pmd = alloc_low_page(&map, &pmd_phys); | |
44df75e6 | 286 | spin_lock(&init_mm.page_table_lock); |
1da177e4 | 287 | set_pud(pud, __pud(pmd_phys | _KERNPG_TABLE)); |
44df75e6 MT |
288 | phys_pmd_init(pmd, paddr, end); |
289 | spin_unlock(&init_mm.page_table_lock); | |
1da177e4 LT |
290 | unmap_low_page(map); |
291 | } | |
292 | __flush_tlb(); | |
293 | } | |
294 | ||
295 | static void __init find_early_table_space(unsigned long end) | |
296 | { | |
6c5acd16 | 297 | unsigned long puds, pmds, tables, start; |
1da177e4 LT |
298 | |
299 | puds = (end + PUD_SIZE - 1) >> PUD_SHIFT; | |
300 | pmds = (end + PMD_SIZE - 1) >> PMD_SHIFT; | |
301 | tables = round_up(puds * sizeof(pud_t), PAGE_SIZE) + | |
302 | round_up(pmds * sizeof(pmd_t), PAGE_SIZE); | |
303 | ||
ee408c79 AK |
304 | /* RED-PEN putting page tables only on node 0 could |
305 | cause a hotspot and fill up ZONE_DMA. The page tables | |
306 | need roughly 0.5KB per GB. */ | |
307 | start = 0x8000; | |
308 | table_start = find_e820_area(start, end, tables); | |
1da177e4 LT |
309 | if (table_start == -1UL) |
310 | panic("Cannot find space for the kernel page tables"); | |
311 | ||
312 | table_start >>= PAGE_SHIFT; | |
313 | table_end = table_start; | |
44df75e6 MT |
314 | |
315 | early_printk("kernel direct mapping tables up to %lx @ %lx-%lx\n", | |
316 | end, table_start << PAGE_SHIFT, table_end << PAGE_SHIFT); | |
1da177e4 LT |
317 | } |
318 | ||
319 | /* Setup the direct mapping of the physical memory at PAGE_OFFSET. | |
320 | This runs before bootmem is initialized and gets pages directly from the | |
321 | physical memory. To access them they are temporarily mapped. */ | |
44df75e6 | 322 | void __meminit init_memory_mapping(unsigned long start, unsigned long end) |
1da177e4 LT |
323 | { |
324 | unsigned long next; | |
325 | ||
326 | Dprintk("init_memory_mapping\n"); | |
327 | ||
328 | /* | |
329 | * Find space for the kernel direct mapping tables. | |
330 | * Later we should allocate these tables in the local node of the memory | |
331 | * mapped. Unfortunately this is done currently before the nodes are | |
332 | * discovered. | |
333 | */ | |
44df75e6 MT |
334 | if (!after_bootmem) |
335 | find_early_table_space(end); | |
1da177e4 LT |
336 | |
337 | start = (unsigned long)__va(start); | |
338 | end = (unsigned long)__va(end); | |
339 | ||
340 | for (; start < end; start = next) { | |
341 | int map; | |
342 | unsigned long pud_phys; | |
44df75e6 MT |
343 | pgd_t *pgd = pgd_offset_k(start); |
344 | pud_t *pud; | |
345 | ||
346 | if (after_bootmem) | |
347 | pud = pud_offset_k(pgd, __PAGE_OFFSET); | |
348 | else | |
349 | pud = alloc_low_page(&map, &pud_phys); | |
350 | ||
1da177e4 LT |
351 | next = start + PGDIR_SIZE; |
352 | if (next > end) | |
353 | next = end; | |
354 | phys_pud_init(pud, __pa(start), __pa(next)); | |
44df75e6 MT |
355 | if (!after_bootmem) |
356 | set_pgd(pgd_offset_k(start), mk_kernel_pgd(pud_phys)); | |
1da177e4 LT |
357 | unmap_low_page(map); |
358 | } | |
359 | ||
44df75e6 MT |
360 | if (!after_bootmem) |
361 | asm volatile("movq %%cr4,%0" : "=r" (mmu_cr4_features)); | |
1da177e4 | 362 | __flush_tlb_all(); |
1da177e4 LT |
363 | } |
364 | ||
f6c2e333 | 365 | void __cpuinit zap_low_mappings(int cpu) |
1da177e4 | 366 | { |
f6c2e333 SS |
367 | if (cpu == 0) { |
368 | pgd_t *pgd = pgd_offset_k(0UL); | |
369 | pgd_clear(pgd); | |
370 | } else { | |
371 | /* | |
372 | * For AP's, zap the low identity mappings by changing the cr3 | |
373 | * to init_level4_pgt and doing local flush tlb all | |
374 | */ | |
375 | asm volatile("movq %0,%%cr3" :: "r" (__pa_symbol(&init_level4_pgt))); | |
376 | } | |
377 | __flush_tlb_all(); | |
1da177e4 LT |
378 | } |
379 | ||
a2f1b424 AK |
380 | /* Compute zone sizes for the DMA and DMA32 zones in a node. */ |
381 | __init void | |
382 | size_zones(unsigned long *z, unsigned long *h, | |
383 | unsigned long start_pfn, unsigned long end_pfn) | |
384 | { | |
385 | int i; | |
386 | unsigned long w; | |
387 | ||
388 | for (i = 0; i < MAX_NR_ZONES; i++) | |
389 | z[i] = 0; | |
390 | ||
391 | if (start_pfn < MAX_DMA_PFN) | |
392 | z[ZONE_DMA] = MAX_DMA_PFN - start_pfn; | |
393 | if (start_pfn < MAX_DMA32_PFN) { | |
394 | unsigned long dma32_pfn = MAX_DMA32_PFN; | |
395 | if (dma32_pfn > end_pfn) | |
396 | dma32_pfn = end_pfn; | |
397 | z[ZONE_DMA32] = dma32_pfn - start_pfn; | |
398 | } | |
399 | z[ZONE_NORMAL] = end_pfn - start_pfn; | |
400 | ||
401 | /* Remove lower zones from higher ones. */ | |
402 | w = 0; | |
403 | for (i = 0; i < MAX_NR_ZONES; i++) { | |
404 | if (z[i]) | |
405 | z[i] -= w; | |
406 | w += z[i]; | |
407 | } | |
408 | ||
409 | /* Compute holes */ | |
576fc097 | 410 | w = start_pfn; |
a2f1b424 AK |
411 | for (i = 0; i < MAX_NR_ZONES; i++) { |
412 | unsigned long s = w; | |
413 | w += z[i]; | |
414 | h[i] = e820_hole_size(s, w); | |
415 | } | |
e18c6874 AK |
416 | |
417 | /* Add the space pace needed for mem_map to the holes too. */ | |
418 | for (i = 0; i < MAX_NR_ZONES; i++) | |
419 | h[i] += (z[i] * sizeof(struct page)) / PAGE_SIZE; | |
420 | ||
421 | /* The 16MB DMA zone has the kernel and other misc mappings. | |
422 | Account them too */ | |
423 | if (h[ZONE_DMA]) { | |
424 | h[ZONE_DMA] += dma_reserve; | |
425 | if (h[ZONE_DMA] >= z[ZONE_DMA]) { | |
426 | printk(KERN_WARNING | |
427 | "Kernel too large and filling up ZONE_DMA?\n"); | |
428 | h[ZONE_DMA] = z[ZONE_DMA]; | |
429 | } | |
430 | } | |
a2f1b424 AK |
431 | } |
432 | ||
2b97690f | 433 | #ifndef CONFIG_NUMA |
1da177e4 LT |
434 | void __init paging_init(void) |
435 | { | |
a2f1b424 | 436 | unsigned long zones[MAX_NR_ZONES], holes[MAX_NR_ZONES]; |
44df75e6 MT |
437 | |
438 | memory_present(0, 0, end_pfn); | |
439 | sparse_init(); | |
a2f1b424 AK |
440 | size_zones(zones, holes, 0, end_pfn); |
441 | free_area_init_node(0, NODE_DATA(0), zones, | |
442 | __pa(PAGE_OFFSET) >> PAGE_SHIFT, holes); | |
1da177e4 LT |
443 | } |
444 | #endif | |
445 | ||
446 | /* Unmap a kernel mapping if it exists. This is useful to avoid prefetches | |
447 | from the CPU leading to inconsistent cache lines. address and size | |
448 | must be aligned to 2MB boundaries. | |
449 | Does nothing when the mapping doesn't exist. */ | |
450 | void __init clear_kernel_mapping(unsigned long address, unsigned long size) | |
451 | { | |
452 | unsigned long end = address + size; | |
453 | ||
454 | BUG_ON(address & ~LARGE_PAGE_MASK); | |
455 | BUG_ON(size & ~LARGE_PAGE_MASK); | |
456 | ||
457 | for (; address < end; address += LARGE_PAGE_SIZE) { | |
458 | pgd_t *pgd = pgd_offset_k(address); | |
459 | pud_t *pud; | |
460 | pmd_t *pmd; | |
461 | if (pgd_none(*pgd)) | |
462 | continue; | |
463 | pud = pud_offset(pgd, address); | |
464 | if (pud_none(*pud)) | |
465 | continue; | |
466 | pmd = pmd_offset(pud, address); | |
467 | if (!pmd || pmd_none(*pmd)) | |
468 | continue; | |
469 | if (0 == (pmd_val(*pmd) & _PAGE_PSE)) { | |
470 | /* Could handle this, but it should not happen currently. */ | |
471 | printk(KERN_ERR | |
472 | "clear_kernel_mapping: mapping has been split. will leak memory\n"); | |
473 | pmd_ERROR(*pmd); | |
474 | } | |
475 | set_pmd(pmd, __pmd(0)); | |
476 | } | |
477 | __flush_tlb_all(); | |
478 | } | |
479 | ||
44df75e6 MT |
480 | /* |
481 | * Memory hotplug specific functions | |
482 | * These are only for non-NUMA machines right now. | |
483 | */ | |
484 | #ifdef CONFIG_MEMORY_HOTPLUG | |
485 | ||
486 | void online_page(struct page *page) | |
487 | { | |
488 | ClearPageReserved(page); | |
7835e98b | 489 | init_page_count(page); |
44df75e6 MT |
490 | __free_page(page); |
491 | totalram_pages++; | |
492 | num_physpages++; | |
493 | } | |
494 | ||
495 | int add_memory(u64 start, u64 size) | |
496 | { | |
497 | struct pglist_data *pgdat = NODE_DATA(0); | |
498 | struct zone *zone = pgdat->node_zones + MAX_NR_ZONES-2; | |
499 | unsigned long start_pfn = start >> PAGE_SHIFT; | |
500 | unsigned long nr_pages = size >> PAGE_SHIFT; | |
501 | int ret; | |
502 | ||
503 | ret = __add_pages(zone, start_pfn, nr_pages); | |
504 | if (ret) | |
505 | goto error; | |
506 | ||
507 | init_memory_mapping(start, (start + size -1)); | |
508 | ||
509 | return ret; | |
510 | error: | |
511 | printk("%s: Problem encountered in __add_pages!\n", __func__); | |
512 | return ret; | |
513 | } | |
514 | EXPORT_SYMBOL_GPL(add_memory); | |
515 | ||
516 | int remove_memory(u64 start, u64 size) | |
517 | { | |
518 | return -EINVAL; | |
519 | } | |
520 | EXPORT_SYMBOL_GPL(remove_memory); | |
521 | ||
522 | #endif | |
523 | ||
1da177e4 LT |
524 | static struct kcore_list kcore_mem, kcore_vmalloc, kcore_kernel, kcore_modules, |
525 | kcore_vsyscall; | |
526 | ||
527 | void __init mem_init(void) | |
528 | { | |
0a43e4bf | 529 | long codesize, reservedpages, datasize, initsize; |
1da177e4 LT |
530 | |
531 | #ifdef CONFIG_SWIOTLB | |
17a941d8 | 532 | pci_swiotlb_init(); |
1da177e4 | 533 | #endif |
17a941d8 | 534 | no_iommu_init(); |
1da177e4 LT |
535 | |
536 | /* How many end-of-memory variables you have, grandma! */ | |
537 | max_low_pfn = end_pfn; | |
538 | max_pfn = end_pfn; | |
539 | num_physpages = end_pfn; | |
540 | high_memory = (void *) __va(end_pfn * PAGE_SIZE); | |
541 | ||
542 | /* clear the zero-page */ | |
543 | memset(empty_zero_page, 0, PAGE_SIZE); | |
544 | ||
545 | reservedpages = 0; | |
546 | ||
547 | /* this will put all low memory onto the freelists */ | |
2b97690f | 548 | #ifdef CONFIG_NUMA |
0a43e4bf | 549 | totalram_pages = numa_free_all_bootmem(); |
1da177e4 | 550 | #else |
0a43e4bf | 551 | totalram_pages = free_all_bootmem(); |
1da177e4 | 552 | #endif |
0a43e4bf | 553 | reservedpages = end_pfn - totalram_pages - e820_hole_size(0, end_pfn); |
1da177e4 LT |
554 | |
555 | after_bootmem = 1; | |
556 | ||
557 | codesize = (unsigned long) &_etext - (unsigned long) &_text; | |
558 | datasize = (unsigned long) &_edata - (unsigned long) &_etext; | |
559 | initsize = (unsigned long) &__init_end - (unsigned long) &__init_begin; | |
560 | ||
561 | /* Register memory areas for /proc/kcore */ | |
562 | kclist_add(&kcore_mem, __va(0), max_low_pfn << PAGE_SHIFT); | |
563 | kclist_add(&kcore_vmalloc, (void *)VMALLOC_START, | |
564 | VMALLOC_END-VMALLOC_START); | |
565 | kclist_add(&kcore_kernel, &_stext, _end - _stext); | |
566 | kclist_add(&kcore_modules, (void *)MODULES_VADDR, MODULES_LEN); | |
567 | kclist_add(&kcore_vsyscall, (void *)VSYSCALL_START, | |
568 | VSYSCALL_END - VSYSCALL_START); | |
569 | ||
0a43e4bf | 570 | printk("Memory: %luk/%luk available (%ldk kernel code, %ldk reserved, %ldk data, %ldk init)\n", |
1da177e4 LT |
571 | (unsigned long) nr_free_pages() << (PAGE_SHIFT-10), |
572 | end_pfn << (PAGE_SHIFT-10), | |
573 | codesize >> 10, | |
574 | reservedpages << (PAGE_SHIFT-10), | |
575 | datasize >> 10, | |
576 | initsize >> 10); | |
577 | ||
f6c2e333 | 578 | #ifdef CONFIG_SMP |
1da177e4 | 579 | /* |
f6c2e333 SS |
580 | * Sync boot_level4_pgt mappings with the init_level4_pgt |
581 | * except for the low identity mappings which are already zapped | |
582 | * in init_level4_pgt. This sync-up is essential for AP's bringup | |
1da177e4 | 583 | */ |
f6c2e333 | 584 | memcpy(boot_level4_pgt+1, init_level4_pgt+1, (PTRS_PER_PGD-1)*sizeof(pgd_t)); |
1da177e4 LT |
585 | #endif |
586 | } | |
587 | ||
1da177e4 LT |
588 | void free_initmem(void) |
589 | { | |
590 | unsigned long addr; | |
591 | ||
592 | addr = (unsigned long)(&__init_begin); | |
593 | for (; addr < (unsigned long)(&__init_end); addr += PAGE_SIZE) { | |
594 | ClearPageReserved(virt_to_page(addr)); | |
7835e98b | 595 | init_page_count(virt_to_page(addr)); |
1da177e4 LT |
596 | memset((void *)(addr & ~(PAGE_SIZE-1)), 0xcc, PAGE_SIZE); |
597 | free_page(addr); | |
598 | totalram_pages++; | |
599 | } | |
600 | memset(__initdata_begin, 0xba, __initdata_end - __initdata_begin); | |
2bc0414e | 601 | printk ("Freeing unused kernel memory: %luk freed\n", (__init_end - __init_begin) >> 10); |
1da177e4 LT |
602 | } |
603 | ||
67df197b AV |
604 | #ifdef CONFIG_DEBUG_RODATA |
605 | ||
606 | extern char __start_rodata, __end_rodata; | |
607 | void mark_rodata_ro(void) | |
608 | { | |
609 | unsigned long addr = (unsigned long)&__start_rodata; | |
610 | ||
611 | for (; addr < (unsigned long)&__end_rodata; addr += PAGE_SIZE) | |
612 | change_page_attr_addr(addr, 1, PAGE_KERNEL_RO); | |
613 | ||
614 | printk ("Write protecting the kernel read-only data: %luk\n", | |
615 | (&__end_rodata - &__start_rodata) >> 10); | |
616 | ||
617 | /* | |
618 | * change_page_attr_addr() requires a global_flush_tlb() call after it. | |
619 | * We do this after the printk so that if something went wrong in the | |
620 | * change, the printk gets out at least to give a better debug hint | |
621 | * of who is the culprit. | |
622 | */ | |
623 | global_flush_tlb(); | |
624 | } | |
625 | #endif | |
626 | ||
1da177e4 LT |
627 | #ifdef CONFIG_BLK_DEV_INITRD |
628 | void free_initrd_mem(unsigned long start, unsigned long end) | |
629 | { | |
f74e6670 | 630 | if (start >= end) |
1da177e4 LT |
631 | return; |
632 | printk ("Freeing initrd memory: %ldk freed\n", (end - start) >> 10); | |
633 | for (; start < end; start += PAGE_SIZE) { | |
634 | ClearPageReserved(virt_to_page(start)); | |
7835e98b | 635 | init_page_count(virt_to_page(start)); |
1da177e4 LT |
636 | free_page(start); |
637 | totalram_pages++; | |
638 | } | |
639 | } | |
640 | #endif | |
641 | ||
642 | void __init reserve_bootmem_generic(unsigned long phys, unsigned len) | |
643 | { | |
644 | /* Should check here against the e820 map to avoid double free */ | |
2b97690f | 645 | #ifdef CONFIG_NUMA |
1da177e4 LT |
646 | int nid = phys_to_nid(phys); |
647 | reserve_bootmem_node(NODE_DATA(nid), phys, len); | |
648 | #else | |
649 | reserve_bootmem(phys, len); | |
650 | #endif | |
e18c6874 AK |
651 | if (phys+len <= MAX_DMA_PFN*PAGE_SIZE) |
652 | dma_reserve += len / PAGE_SIZE; | |
1da177e4 LT |
653 | } |
654 | ||
655 | int kern_addr_valid(unsigned long addr) | |
656 | { | |
657 | unsigned long above = ((long)addr) >> __VIRTUAL_MASK_SHIFT; | |
658 | pgd_t *pgd; | |
659 | pud_t *pud; | |
660 | pmd_t *pmd; | |
661 | pte_t *pte; | |
662 | ||
663 | if (above != 0 && above != -1UL) | |
664 | return 0; | |
665 | ||
666 | pgd = pgd_offset_k(addr); | |
667 | if (pgd_none(*pgd)) | |
668 | return 0; | |
669 | ||
670 | pud = pud_offset(pgd, addr); | |
671 | if (pud_none(*pud)) | |
672 | return 0; | |
673 | ||
674 | pmd = pmd_offset(pud, addr); | |
675 | if (pmd_none(*pmd)) | |
676 | return 0; | |
677 | if (pmd_large(*pmd)) | |
678 | return pfn_valid(pmd_pfn(*pmd)); | |
679 | ||
680 | pte = pte_offset_kernel(pmd, addr); | |
681 | if (pte_none(*pte)) | |
682 | return 0; | |
683 | return pfn_valid(pte_pfn(*pte)); | |
684 | } | |
685 | ||
686 | #ifdef CONFIG_SYSCTL | |
687 | #include <linux/sysctl.h> | |
688 | ||
689 | extern int exception_trace, page_fault_trace; | |
690 | ||
691 | static ctl_table debug_table2[] = { | |
692 | { 99, "exception-trace", &exception_trace, sizeof(int), 0644, NULL, | |
693 | proc_dointvec }, | |
1da177e4 LT |
694 | { 0, } |
695 | }; | |
696 | ||
697 | static ctl_table debug_root_table2[] = { | |
698 | { .ctl_name = CTL_DEBUG, .procname = "debug", .mode = 0555, | |
699 | .child = debug_table2 }, | |
700 | { 0 }, | |
701 | }; | |
702 | ||
703 | static __init int x8664_sysctl_init(void) | |
704 | { | |
705 | register_sysctl_table(debug_root_table2, 1); | |
706 | return 0; | |
707 | } | |
708 | __initcall(x8664_sysctl_init); | |
709 | #endif | |
710 | ||
1e014410 AK |
711 | /* A pseudo VMAs to allow ptrace access for the vsyscall page. This only |
712 | covers the 64bit vsyscall page now. 32bit has a real VMA now and does | |
713 | not need special handling anymore. */ | |
1da177e4 LT |
714 | |
715 | static struct vm_area_struct gate_vma = { | |
716 | .vm_start = VSYSCALL_START, | |
717 | .vm_end = VSYSCALL_END, | |
718 | .vm_page_prot = PAGE_READONLY | |
719 | }; | |
720 | ||
1da177e4 LT |
721 | struct vm_area_struct *get_gate_vma(struct task_struct *tsk) |
722 | { | |
723 | #ifdef CONFIG_IA32_EMULATION | |
1e014410 AK |
724 | if (test_tsk_thread_flag(tsk, TIF_IA32)) |
725 | return NULL; | |
1da177e4 LT |
726 | #endif |
727 | return &gate_vma; | |
728 | } | |
729 | ||
730 | int in_gate_area(struct task_struct *task, unsigned long addr) | |
731 | { | |
732 | struct vm_area_struct *vma = get_gate_vma(task); | |
1e014410 AK |
733 | if (!vma) |
734 | return 0; | |
1da177e4 LT |
735 | return (addr >= vma->vm_start) && (addr < vma->vm_end); |
736 | } | |
737 | ||
738 | /* Use this when you have no reliable task/vma, typically from interrupt | |
739 | * context. It is less reliable than using the task's vma and may give | |
740 | * false positives. | |
741 | */ | |
742 | int in_gate_area_no_task(unsigned long addr) | |
743 | { | |
1e014410 | 744 | return (addr >= VSYSCALL_START) && (addr < VSYSCALL_END); |
1da177e4 | 745 | } |