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> |
1da177e4 LT |
44 | |
45 | #ifndef Dprintk | |
46 | #define Dprintk(x...) | |
47 | #endif | |
48 | ||
17a941d8 MBY |
49 | struct dma_mapping_ops* dma_ops; |
50 | EXPORT_SYMBOL(dma_ops); | |
51 | ||
e18c6874 AK |
52 | static unsigned long dma_reserve __initdata; |
53 | ||
1da177e4 LT |
54 | DEFINE_PER_CPU(struct mmu_gather, mmu_gathers); |
55 | ||
56 | /* | |
57 | * NOTE: pagetable_init alloc all the fixmap pagetables contiguous on the | |
58 | * physical space so we can cache the place of the first one and move | |
59 | * around without checking the pgd every time. | |
60 | */ | |
61 | ||
62 | void show_mem(void) | |
63 | { | |
e92343cc AK |
64 | long i, total = 0, reserved = 0; |
65 | long shared = 0, cached = 0; | |
1da177e4 LT |
66 | pg_data_t *pgdat; |
67 | struct page *page; | |
68 | ||
e92343cc | 69 | printk(KERN_INFO "Mem-info:\n"); |
1da177e4 | 70 | show_free_areas(); |
e92343cc | 71 | printk(KERN_INFO "Free swap: %6ldkB\n", nr_swap_pages<<(PAGE_SHIFT-10)); |
1da177e4 | 72 | |
ec936fc5 | 73 | for_each_online_pgdat(pgdat) { |
1da177e4 LT |
74 | for (i = 0; i < pgdat->node_spanned_pages; ++i) { |
75 | page = pfn_to_page(pgdat->node_start_pfn + i); | |
76 | total++; | |
e92343cc AK |
77 | if (PageReserved(page)) |
78 | reserved++; | |
79 | else if (PageSwapCache(page)) | |
80 | cached++; | |
81 | else if (page_count(page)) | |
82 | shared += page_count(page) - 1; | |
1da177e4 LT |
83 | } |
84 | } | |
e92343cc AK |
85 | printk(KERN_INFO "%lu pages of RAM\n", total); |
86 | printk(KERN_INFO "%lu reserved pages\n",reserved); | |
87 | printk(KERN_INFO "%lu pages shared\n",shared); | |
88 | printk(KERN_INFO "%lu pages swap cached\n",cached); | |
1da177e4 LT |
89 | } |
90 | ||
91 | /* References to section boundaries */ | |
92 | ||
1da177e4 LT |
93 | int after_bootmem; |
94 | ||
5f44a669 | 95 | static __init void *spp_getpage(void) |
1da177e4 LT |
96 | { |
97 | void *ptr; | |
98 | if (after_bootmem) | |
99 | ptr = (void *) get_zeroed_page(GFP_ATOMIC); | |
100 | else | |
101 | ptr = alloc_bootmem_pages(PAGE_SIZE); | |
102 | if (!ptr || ((unsigned long)ptr & ~PAGE_MASK)) | |
103 | panic("set_pte_phys: cannot allocate page data %s\n", after_bootmem?"after bootmem":""); | |
104 | ||
105 | Dprintk("spp_getpage %p\n", ptr); | |
106 | return ptr; | |
107 | } | |
108 | ||
5f44a669 | 109 | static __init void set_pte_phys(unsigned long vaddr, |
1da177e4 LT |
110 | unsigned long phys, pgprot_t prot) |
111 | { | |
112 | pgd_t *pgd; | |
113 | pud_t *pud; | |
114 | pmd_t *pmd; | |
115 | pte_t *pte, new_pte; | |
116 | ||
117 | Dprintk("set_pte_phys %lx to %lx\n", vaddr, phys); | |
118 | ||
119 | pgd = pgd_offset_k(vaddr); | |
120 | if (pgd_none(*pgd)) { | |
121 | printk("PGD FIXMAP MISSING, it should be setup in head.S!\n"); | |
122 | return; | |
123 | } | |
124 | pud = pud_offset(pgd, vaddr); | |
125 | if (pud_none(*pud)) { | |
126 | pmd = (pmd_t *) spp_getpage(); | |
127 | set_pud(pud, __pud(__pa(pmd) | _KERNPG_TABLE | _PAGE_USER)); | |
128 | if (pmd != pmd_offset(pud, 0)) { | |
129 | printk("PAGETABLE BUG #01! %p <-> %p\n", pmd, pmd_offset(pud,0)); | |
130 | return; | |
131 | } | |
132 | } | |
133 | pmd = pmd_offset(pud, vaddr); | |
134 | if (pmd_none(*pmd)) { | |
135 | pte = (pte_t *) spp_getpage(); | |
136 | set_pmd(pmd, __pmd(__pa(pte) | _KERNPG_TABLE | _PAGE_USER)); | |
137 | if (pte != pte_offset_kernel(pmd, 0)) { | |
138 | printk("PAGETABLE BUG #02!\n"); | |
139 | return; | |
140 | } | |
141 | } | |
142 | new_pte = pfn_pte(phys >> PAGE_SHIFT, prot); | |
143 | ||
144 | pte = pte_offset_kernel(pmd, vaddr); | |
145 | if (!pte_none(*pte) && | |
146 | pte_val(*pte) != (pte_val(new_pte) & __supported_pte_mask)) | |
147 | pte_ERROR(*pte); | |
148 | set_pte(pte, new_pte); | |
149 | ||
150 | /* | |
151 | * It's enough to flush this one mapping. | |
152 | * (PGE mappings get flushed as well) | |
153 | */ | |
154 | __flush_tlb_one(vaddr); | |
155 | } | |
156 | ||
157 | /* NOTE: this is meant to be run only at boot */ | |
5f44a669 AK |
158 | void __init |
159 | __set_fixmap (enum fixed_addresses idx, unsigned long phys, pgprot_t prot) | |
1da177e4 LT |
160 | { |
161 | unsigned long address = __fix_to_virt(idx); | |
162 | ||
163 | if (idx >= __end_of_fixed_addresses) { | |
164 | printk("Invalid __set_fixmap\n"); | |
165 | return; | |
166 | } | |
167 | set_pte_phys(address, phys, prot); | |
168 | } | |
169 | ||
170 | unsigned long __initdata table_start, table_end; | |
171 | ||
172 | extern pmd_t temp_boot_pmds[]; | |
173 | ||
174 | static struct temp_map { | |
175 | pmd_t *pmd; | |
176 | void *address; | |
177 | int allocated; | |
178 | } temp_mappings[] __initdata = { | |
179 | { &temp_boot_pmds[0], (void *)(40UL * 1024 * 1024) }, | |
180 | { &temp_boot_pmds[1], (void *)(42UL * 1024 * 1024) }, | |
181 | {} | |
182 | }; | |
183 | ||
44df75e6 | 184 | static __meminit void *alloc_low_page(int *index, unsigned long *phys) |
1da177e4 LT |
185 | { |
186 | struct temp_map *ti; | |
187 | int i; | |
188 | unsigned long pfn = table_end++, paddr; | |
189 | void *adr; | |
190 | ||
44df75e6 MT |
191 | if (after_bootmem) { |
192 | adr = (void *)get_zeroed_page(GFP_ATOMIC); | |
193 | *phys = __pa(adr); | |
194 | return adr; | |
195 | } | |
196 | ||
1da177e4 LT |
197 | if (pfn >= end_pfn) |
198 | panic("alloc_low_page: ran out of memory"); | |
199 | for (i = 0; temp_mappings[i].allocated; i++) { | |
200 | if (!temp_mappings[i].pmd) | |
201 | panic("alloc_low_page: ran out of temp mappings"); | |
202 | } | |
203 | ti = &temp_mappings[i]; | |
204 | paddr = (pfn << PAGE_SHIFT) & PMD_MASK; | |
205 | set_pmd(ti->pmd, __pmd(paddr | _KERNPG_TABLE | _PAGE_PSE)); | |
206 | ti->allocated = 1; | |
207 | __flush_tlb(); | |
208 | adr = ti->address + ((pfn << PAGE_SHIFT) & ~PMD_MASK); | |
44df75e6 | 209 | memset(adr, 0, PAGE_SIZE); |
1da177e4 LT |
210 | *index = i; |
211 | *phys = pfn * PAGE_SIZE; | |
212 | return adr; | |
213 | } | |
214 | ||
44df75e6 | 215 | static __meminit void unmap_low_page(int i) |
1da177e4 | 216 | { |
44df75e6 MT |
217 | struct temp_map *ti; |
218 | ||
219 | if (after_bootmem) | |
220 | return; | |
221 | ||
222 | ti = &temp_mappings[i]; | |
1da177e4 LT |
223 | set_pmd(ti->pmd, __pmd(0)); |
224 | ti->allocated = 0; | |
225 | } | |
226 | ||
f2d3efed AK |
227 | /* Must run before zap_low_mappings */ |
228 | __init void *early_ioremap(unsigned long addr, unsigned long size) | |
229 | { | |
230 | unsigned long map = round_down(addr, LARGE_PAGE_SIZE); | |
231 | ||
232 | /* actually usually some more */ | |
233 | if (size >= LARGE_PAGE_SIZE) { | |
234 | printk("SMBIOS area too long %lu\n", size); | |
235 | return NULL; | |
236 | } | |
237 | set_pmd(temp_mappings[0].pmd, __pmd(map | _KERNPG_TABLE | _PAGE_PSE)); | |
238 | map += LARGE_PAGE_SIZE; | |
239 | set_pmd(temp_mappings[1].pmd, __pmd(map | _KERNPG_TABLE | _PAGE_PSE)); | |
240 | __flush_tlb(); | |
241 | return temp_mappings[0].address + (addr & (LARGE_PAGE_SIZE-1)); | |
242 | } | |
243 | ||
244 | /* To avoid virtual aliases later */ | |
245 | __init void early_iounmap(void *addr, unsigned long size) | |
246 | { | |
247 | if ((void *)round_down((unsigned long)addr, LARGE_PAGE_SIZE) != temp_mappings[0].address) | |
248 | printk("early_iounmap: bad address %p\n", addr); | |
249 | set_pmd(temp_mappings[0].pmd, __pmd(0)); | |
250 | set_pmd(temp_mappings[1].pmd, __pmd(0)); | |
251 | __flush_tlb(); | |
252 | } | |
253 | ||
44df75e6 MT |
254 | static void __meminit |
255 | phys_pmd_init(pmd_t *pmd, unsigned long address, unsigned long end) | |
256 | { | |
257 | int i; | |
258 | ||
259 | for (i = 0; i < PTRS_PER_PMD; pmd++, i++, address += PMD_SIZE) { | |
260 | unsigned long entry; | |
261 | ||
262 | if (address > end) { | |
263 | for (; i < PTRS_PER_PMD; i++, pmd++) | |
264 | set_pmd(pmd, __pmd(0)); | |
265 | break; | |
266 | } | |
267 | entry = _PAGE_NX|_PAGE_PSE|_KERNPG_TABLE|_PAGE_GLOBAL|address; | |
268 | entry &= __supported_pte_mask; | |
269 | set_pmd(pmd, __pmd(entry)); | |
270 | } | |
271 | } | |
272 | ||
273 | static void __meminit | |
274 | phys_pmd_update(pud_t *pud, unsigned long address, unsigned long end) | |
275 | { | |
276 | pmd_t *pmd = pmd_offset(pud, (unsigned long)__va(address)); | |
277 | ||
278 | if (pmd_none(*pmd)) { | |
279 | spin_lock(&init_mm.page_table_lock); | |
280 | phys_pmd_init(pmd, address, end); | |
281 | spin_unlock(&init_mm.page_table_lock); | |
282 | __flush_tlb_all(); | |
283 | } | |
284 | } | |
285 | ||
286 | static void __meminit phys_pud_init(pud_t *pud, unsigned long address, unsigned long end) | |
1da177e4 | 287 | { |
44df75e6 | 288 | long i = pud_index(address); |
1da177e4 | 289 | |
1da177e4 | 290 | pud = pud + i; |
44df75e6 MT |
291 | |
292 | if (after_bootmem && pud_val(*pud)) { | |
293 | phys_pmd_update(pud, address, end); | |
294 | return; | |
295 | } | |
296 | ||
1da177e4 LT |
297 | for (; i < PTRS_PER_PUD; pud++, i++) { |
298 | int map; | |
299 | unsigned long paddr, pmd_phys; | |
300 | pmd_t *pmd; | |
301 | ||
44df75e6 MT |
302 | paddr = (address & PGDIR_MASK) + i*PUD_SIZE; |
303 | if (paddr >= end) | |
1da177e4 | 304 | break; |
1da177e4 | 305 | |
eee5a9fa | 306 | if (!after_bootmem && !e820_any_mapped(paddr, paddr+PUD_SIZE, 0)) { |
1da177e4 LT |
307 | set_pud(pud, __pud(0)); |
308 | continue; | |
309 | } | |
310 | ||
311 | pmd = alloc_low_page(&map, &pmd_phys); | |
44df75e6 | 312 | spin_lock(&init_mm.page_table_lock); |
1da177e4 | 313 | set_pud(pud, __pud(pmd_phys | _KERNPG_TABLE)); |
44df75e6 MT |
314 | phys_pmd_init(pmd, paddr, end); |
315 | spin_unlock(&init_mm.page_table_lock); | |
1da177e4 LT |
316 | unmap_low_page(map); |
317 | } | |
318 | __flush_tlb(); | |
319 | } | |
320 | ||
321 | static void __init find_early_table_space(unsigned long end) | |
322 | { | |
6c5acd16 | 323 | unsigned long puds, pmds, tables, start; |
1da177e4 LT |
324 | |
325 | puds = (end + PUD_SIZE - 1) >> PUD_SHIFT; | |
326 | pmds = (end + PMD_SIZE - 1) >> PMD_SHIFT; | |
327 | tables = round_up(puds * sizeof(pud_t), PAGE_SIZE) + | |
328 | round_up(pmds * sizeof(pmd_t), PAGE_SIZE); | |
329 | ||
ee408c79 AK |
330 | /* RED-PEN putting page tables only on node 0 could |
331 | cause a hotspot and fill up ZONE_DMA. The page tables | |
332 | need roughly 0.5KB per GB. */ | |
333 | start = 0x8000; | |
334 | table_start = find_e820_area(start, end, tables); | |
1da177e4 LT |
335 | if (table_start == -1UL) |
336 | panic("Cannot find space for the kernel page tables"); | |
337 | ||
338 | table_start >>= PAGE_SHIFT; | |
339 | table_end = table_start; | |
44df75e6 MT |
340 | |
341 | early_printk("kernel direct mapping tables up to %lx @ %lx-%lx\n", | |
342 | end, table_start << PAGE_SHIFT, table_end << PAGE_SHIFT); | |
1da177e4 LT |
343 | } |
344 | ||
345 | /* Setup the direct mapping of the physical memory at PAGE_OFFSET. | |
346 | This runs before bootmem is initialized and gets pages directly from the | |
347 | physical memory. To access them they are temporarily mapped. */ | |
44df75e6 | 348 | void __meminit init_memory_mapping(unsigned long start, unsigned long end) |
1da177e4 LT |
349 | { |
350 | unsigned long next; | |
351 | ||
352 | Dprintk("init_memory_mapping\n"); | |
353 | ||
354 | /* | |
355 | * Find space for the kernel direct mapping tables. | |
356 | * Later we should allocate these tables in the local node of the memory | |
357 | * mapped. Unfortunately this is done currently before the nodes are | |
358 | * discovered. | |
359 | */ | |
44df75e6 MT |
360 | if (!after_bootmem) |
361 | find_early_table_space(end); | |
1da177e4 LT |
362 | |
363 | start = (unsigned long)__va(start); | |
364 | end = (unsigned long)__va(end); | |
365 | ||
366 | for (; start < end; start = next) { | |
367 | int map; | |
368 | unsigned long pud_phys; | |
44df75e6 MT |
369 | pgd_t *pgd = pgd_offset_k(start); |
370 | pud_t *pud; | |
371 | ||
372 | if (after_bootmem) | |
d2ae5b5f | 373 | pud = pud_offset(pgd, start & PGDIR_MASK); |
44df75e6 MT |
374 | else |
375 | pud = alloc_low_page(&map, &pud_phys); | |
376 | ||
1da177e4 LT |
377 | next = start + PGDIR_SIZE; |
378 | if (next > end) | |
379 | next = end; | |
380 | phys_pud_init(pud, __pa(start), __pa(next)); | |
44df75e6 MT |
381 | if (!after_bootmem) |
382 | set_pgd(pgd_offset_k(start), mk_kernel_pgd(pud_phys)); | |
1da177e4 LT |
383 | unmap_low_page(map); |
384 | } | |
385 | ||
44df75e6 MT |
386 | if (!after_bootmem) |
387 | asm volatile("movq %%cr4,%0" : "=r" (mmu_cr4_features)); | |
1da177e4 | 388 | __flush_tlb_all(); |
1da177e4 LT |
389 | } |
390 | ||
f6c2e333 | 391 | void __cpuinit zap_low_mappings(int cpu) |
1da177e4 | 392 | { |
f6c2e333 SS |
393 | if (cpu == 0) { |
394 | pgd_t *pgd = pgd_offset_k(0UL); | |
395 | pgd_clear(pgd); | |
396 | } else { | |
397 | /* | |
398 | * For AP's, zap the low identity mappings by changing the cr3 | |
399 | * to init_level4_pgt and doing local flush tlb all | |
400 | */ | |
401 | asm volatile("movq %0,%%cr3" :: "r" (__pa_symbol(&init_level4_pgt))); | |
402 | } | |
403 | __flush_tlb_all(); | |
1da177e4 LT |
404 | } |
405 | ||
a2f1b424 AK |
406 | /* Compute zone sizes for the DMA and DMA32 zones in a node. */ |
407 | __init void | |
408 | size_zones(unsigned long *z, unsigned long *h, | |
409 | unsigned long start_pfn, unsigned long end_pfn) | |
410 | { | |
411 | int i; | |
412 | unsigned long w; | |
413 | ||
414 | for (i = 0; i < MAX_NR_ZONES; i++) | |
415 | z[i] = 0; | |
416 | ||
417 | if (start_pfn < MAX_DMA_PFN) | |
418 | z[ZONE_DMA] = MAX_DMA_PFN - start_pfn; | |
419 | if (start_pfn < MAX_DMA32_PFN) { | |
420 | unsigned long dma32_pfn = MAX_DMA32_PFN; | |
421 | if (dma32_pfn > end_pfn) | |
422 | dma32_pfn = end_pfn; | |
423 | z[ZONE_DMA32] = dma32_pfn - start_pfn; | |
424 | } | |
425 | z[ZONE_NORMAL] = end_pfn - start_pfn; | |
426 | ||
427 | /* Remove lower zones from higher ones. */ | |
428 | w = 0; | |
429 | for (i = 0; i < MAX_NR_ZONES; i++) { | |
430 | if (z[i]) | |
431 | z[i] -= w; | |
432 | w += z[i]; | |
433 | } | |
434 | ||
435 | /* Compute holes */ | |
576fc097 | 436 | w = start_pfn; |
a2f1b424 AK |
437 | for (i = 0; i < MAX_NR_ZONES; i++) { |
438 | unsigned long s = w; | |
439 | w += z[i]; | |
440 | h[i] = e820_hole_size(s, w); | |
441 | } | |
e18c6874 AK |
442 | |
443 | /* Add the space pace needed for mem_map to the holes too. */ | |
444 | for (i = 0; i < MAX_NR_ZONES; i++) | |
445 | h[i] += (z[i] * sizeof(struct page)) / PAGE_SIZE; | |
446 | ||
447 | /* The 16MB DMA zone has the kernel and other misc mappings. | |
448 | Account them too */ | |
449 | if (h[ZONE_DMA]) { | |
450 | h[ZONE_DMA] += dma_reserve; | |
451 | if (h[ZONE_DMA] >= z[ZONE_DMA]) { | |
452 | printk(KERN_WARNING | |
453 | "Kernel too large and filling up ZONE_DMA?\n"); | |
454 | h[ZONE_DMA] = z[ZONE_DMA]; | |
455 | } | |
456 | } | |
a2f1b424 AK |
457 | } |
458 | ||
2b97690f | 459 | #ifndef CONFIG_NUMA |
1da177e4 LT |
460 | void __init paging_init(void) |
461 | { | |
a2f1b424 | 462 | unsigned long zones[MAX_NR_ZONES], holes[MAX_NR_ZONES]; |
44df75e6 MT |
463 | |
464 | memory_present(0, 0, end_pfn); | |
465 | sparse_init(); | |
a2f1b424 AK |
466 | size_zones(zones, holes, 0, end_pfn); |
467 | free_area_init_node(0, NODE_DATA(0), zones, | |
468 | __pa(PAGE_OFFSET) >> PAGE_SHIFT, holes); | |
1da177e4 LT |
469 | } |
470 | #endif | |
471 | ||
472 | /* Unmap a kernel mapping if it exists. This is useful to avoid prefetches | |
473 | from the CPU leading to inconsistent cache lines. address and size | |
474 | must be aligned to 2MB boundaries. | |
475 | Does nothing when the mapping doesn't exist. */ | |
476 | void __init clear_kernel_mapping(unsigned long address, unsigned long size) | |
477 | { | |
478 | unsigned long end = address + size; | |
479 | ||
480 | BUG_ON(address & ~LARGE_PAGE_MASK); | |
481 | BUG_ON(size & ~LARGE_PAGE_MASK); | |
482 | ||
483 | for (; address < end; address += LARGE_PAGE_SIZE) { | |
484 | pgd_t *pgd = pgd_offset_k(address); | |
485 | pud_t *pud; | |
486 | pmd_t *pmd; | |
487 | if (pgd_none(*pgd)) | |
488 | continue; | |
489 | pud = pud_offset(pgd, address); | |
490 | if (pud_none(*pud)) | |
491 | continue; | |
492 | pmd = pmd_offset(pud, address); | |
493 | if (!pmd || pmd_none(*pmd)) | |
494 | continue; | |
495 | if (0 == (pmd_val(*pmd) & _PAGE_PSE)) { | |
496 | /* Could handle this, but it should not happen currently. */ | |
497 | printk(KERN_ERR | |
498 | "clear_kernel_mapping: mapping has been split. will leak memory\n"); | |
499 | pmd_ERROR(*pmd); | |
500 | } | |
501 | set_pmd(pmd, __pmd(0)); | |
502 | } | |
503 | __flush_tlb_all(); | |
504 | } | |
505 | ||
44df75e6 MT |
506 | /* |
507 | * Memory hotplug specific functions | |
44df75e6 | 508 | */ |
9d99aaa3 | 509 | #if defined(CONFIG_ACPI_HOTPLUG_MEMORY) || defined(CONFIG_ACPI_HOTPLUG_MEMORY_MODULE) |
44df75e6 MT |
510 | |
511 | void online_page(struct page *page) | |
512 | { | |
513 | ClearPageReserved(page); | |
7835e98b | 514 | init_page_count(page); |
44df75e6 MT |
515 | __free_page(page); |
516 | totalram_pages++; | |
517 | num_physpages++; | |
518 | } | |
519 | ||
9d99aaa3 AK |
520 | #ifndef CONFIG_MEMORY_HOTPLUG |
521 | /* | |
522 | * Memory Hotadd without sparsemem. The mem_maps have been allocated in advance, | |
523 | * just online the pages. | |
524 | */ | |
525 | int __add_pages(struct zone *z, unsigned long start_pfn, unsigned long nr_pages) | |
526 | { | |
527 | int err = -EIO; | |
528 | unsigned long pfn; | |
529 | unsigned long total = 0, mem = 0; | |
530 | for (pfn = start_pfn; pfn < start_pfn + nr_pages; pfn++) { | |
68a3a7fe | 531 | if (pfn_valid(pfn)) { |
9d99aaa3 AK |
532 | online_page(pfn_to_page(pfn)); |
533 | err = 0; | |
534 | mem++; | |
535 | } | |
536 | total++; | |
537 | } | |
538 | if (!err) { | |
539 | z->spanned_pages += total; | |
540 | z->present_pages += mem; | |
541 | z->zone_pgdat->node_spanned_pages += total; | |
542 | z->zone_pgdat->node_present_pages += mem; | |
543 | } | |
544 | return err; | |
545 | } | |
546 | #endif | |
547 | ||
548 | /* | |
549 | * Memory is added always to NORMAL zone. This means you will never get | |
550 | * additional DMA/DMA32 memory. | |
551 | */ | |
44df75e6 MT |
552 | int add_memory(u64 start, u64 size) |
553 | { | |
554 | struct pglist_data *pgdat = NODE_DATA(0); | |
555 | struct zone *zone = pgdat->node_zones + MAX_NR_ZONES-2; | |
556 | unsigned long start_pfn = start >> PAGE_SHIFT; | |
557 | unsigned long nr_pages = size >> PAGE_SHIFT; | |
558 | int ret; | |
559 | ||
560 | ret = __add_pages(zone, start_pfn, nr_pages); | |
561 | if (ret) | |
562 | goto error; | |
563 | ||
564 | init_memory_mapping(start, (start + size -1)); | |
565 | ||
566 | return ret; | |
567 | error: | |
568 | printk("%s: Problem encountered in __add_pages!\n", __func__); | |
569 | return ret; | |
570 | } | |
571 | EXPORT_SYMBOL_GPL(add_memory); | |
572 | ||
573 | int remove_memory(u64 start, u64 size) | |
574 | { | |
575 | return -EINVAL; | |
576 | } | |
577 | EXPORT_SYMBOL_GPL(remove_memory); | |
578 | ||
579 | #endif | |
580 | ||
1da177e4 LT |
581 | static struct kcore_list kcore_mem, kcore_vmalloc, kcore_kernel, kcore_modules, |
582 | kcore_vsyscall; | |
583 | ||
584 | void __init mem_init(void) | |
585 | { | |
0a43e4bf | 586 | long codesize, reservedpages, datasize, initsize; |
1da177e4 | 587 | |
0dc243ae | 588 | pci_iommu_alloc(); |
1da177e4 LT |
589 | |
590 | /* How many end-of-memory variables you have, grandma! */ | |
591 | max_low_pfn = end_pfn; | |
592 | max_pfn = end_pfn; | |
593 | num_physpages = end_pfn; | |
594 | high_memory = (void *) __va(end_pfn * PAGE_SIZE); | |
595 | ||
596 | /* clear the zero-page */ | |
597 | memset(empty_zero_page, 0, PAGE_SIZE); | |
598 | ||
599 | reservedpages = 0; | |
600 | ||
601 | /* this will put all low memory onto the freelists */ | |
2b97690f | 602 | #ifdef CONFIG_NUMA |
0a43e4bf | 603 | totalram_pages = numa_free_all_bootmem(); |
1da177e4 | 604 | #else |
0a43e4bf | 605 | totalram_pages = free_all_bootmem(); |
1da177e4 | 606 | #endif |
0a43e4bf | 607 | reservedpages = end_pfn - totalram_pages - e820_hole_size(0, end_pfn); |
1da177e4 LT |
608 | |
609 | after_bootmem = 1; | |
610 | ||
611 | codesize = (unsigned long) &_etext - (unsigned long) &_text; | |
612 | datasize = (unsigned long) &_edata - (unsigned long) &_etext; | |
613 | initsize = (unsigned long) &__init_end - (unsigned long) &__init_begin; | |
614 | ||
615 | /* Register memory areas for /proc/kcore */ | |
616 | kclist_add(&kcore_mem, __va(0), max_low_pfn << PAGE_SHIFT); | |
617 | kclist_add(&kcore_vmalloc, (void *)VMALLOC_START, | |
618 | VMALLOC_END-VMALLOC_START); | |
619 | kclist_add(&kcore_kernel, &_stext, _end - _stext); | |
620 | kclist_add(&kcore_modules, (void *)MODULES_VADDR, MODULES_LEN); | |
621 | kclist_add(&kcore_vsyscall, (void *)VSYSCALL_START, | |
622 | VSYSCALL_END - VSYSCALL_START); | |
623 | ||
0a43e4bf | 624 | printk("Memory: %luk/%luk available (%ldk kernel code, %ldk reserved, %ldk data, %ldk init)\n", |
1da177e4 LT |
625 | (unsigned long) nr_free_pages() << (PAGE_SHIFT-10), |
626 | end_pfn << (PAGE_SHIFT-10), | |
627 | codesize >> 10, | |
628 | reservedpages << (PAGE_SHIFT-10), | |
629 | datasize >> 10, | |
630 | initsize >> 10); | |
631 | ||
f6c2e333 | 632 | #ifdef CONFIG_SMP |
1da177e4 | 633 | /* |
f6c2e333 SS |
634 | * Sync boot_level4_pgt mappings with the init_level4_pgt |
635 | * except for the low identity mappings which are already zapped | |
636 | * in init_level4_pgt. This sync-up is essential for AP's bringup | |
1da177e4 | 637 | */ |
f6c2e333 | 638 | memcpy(boot_level4_pgt+1, init_level4_pgt+1, (PTRS_PER_PGD-1)*sizeof(pgd_t)); |
1da177e4 LT |
639 | #endif |
640 | } | |
641 | ||
d167a518 | 642 | void free_init_pages(char *what, unsigned long begin, unsigned long end) |
1da177e4 LT |
643 | { |
644 | unsigned long addr; | |
645 | ||
d167a518 GH |
646 | if (begin >= end) |
647 | return; | |
648 | ||
649 | printk(KERN_INFO "Freeing %s: %ldk freed\n", what, (end - begin) >> 10); | |
650 | for (addr = begin; addr < end; addr += PAGE_SIZE) { | |
1da177e4 | 651 | ClearPageReserved(virt_to_page(addr)); |
7835e98b | 652 | init_page_count(virt_to_page(addr)); |
1da177e4 LT |
653 | memset((void *)(addr & ~(PAGE_SIZE-1)), 0xcc, PAGE_SIZE); |
654 | free_page(addr); | |
655 | totalram_pages++; | |
656 | } | |
d167a518 GH |
657 | } |
658 | ||
659 | void free_initmem(void) | |
660 | { | |
1da177e4 | 661 | memset(__initdata_begin, 0xba, __initdata_end - __initdata_begin); |
d167a518 GH |
662 | free_init_pages("unused kernel memory", |
663 | (unsigned long)(&__init_begin), | |
664 | (unsigned long)(&__init_end)); | |
1da177e4 LT |
665 | } |
666 | ||
67df197b AV |
667 | #ifdef CONFIG_DEBUG_RODATA |
668 | ||
669 | extern char __start_rodata, __end_rodata; | |
670 | void mark_rodata_ro(void) | |
671 | { | |
672 | unsigned long addr = (unsigned long)&__start_rodata; | |
673 | ||
674 | for (; addr < (unsigned long)&__end_rodata; addr += PAGE_SIZE) | |
675 | change_page_attr_addr(addr, 1, PAGE_KERNEL_RO); | |
676 | ||
677 | printk ("Write protecting the kernel read-only data: %luk\n", | |
678 | (&__end_rodata - &__start_rodata) >> 10); | |
679 | ||
680 | /* | |
681 | * change_page_attr_addr() requires a global_flush_tlb() call after it. | |
682 | * We do this after the printk so that if something went wrong in the | |
683 | * change, the printk gets out at least to give a better debug hint | |
684 | * of who is the culprit. | |
685 | */ | |
686 | global_flush_tlb(); | |
687 | } | |
688 | #endif | |
689 | ||
1da177e4 LT |
690 | #ifdef CONFIG_BLK_DEV_INITRD |
691 | void free_initrd_mem(unsigned long start, unsigned long end) | |
692 | { | |
d167a518 | 693 | free_init_pages("initrd memory", start, end); |
1da177e4 LT |
694 | } |
695 | #endif | |
696 | ||
697 | void __init reserve_bootmem_generic(unsigned long phys, unsigned len) | |
698 | { | |
699 | /* Should check here against the e820 map to avoid double free */ | |
2b97690f | 700 | #ifdef CONFIG_NUMA |
1da177e4 LT |
701 | int nid = phys_to_nid(phys); |
702 | reserve_bootmem_node(NODE_DATA(nid), phys, len); | |
703 | #else | |
704 | reserve_bootmem(phys, len); | |
705 | #endif | |
e18c6874 AK |
706 | if (phys+len <= MAX_DMA_PFN*PAGE_SIZE) |
707 | dma_reserve += len / PAGE_SIZE; | |
1da177e4 LT |
708 | } |
709 | ||
710 | int kern_addr_valid(unsigned long addr) | |
711 | { | |
712 | unsigned long above = ((long)addr) >> __VIRTUAL_MASK_SHIFT; | |
713 | pgd_t *pgd; | |
714 | pud_t *pud; | |
715 | pmd_t *pmd; | |
716 | pte_t *pte; | |
717 | ||
718 | if (above != 0 && above != -1UL) | |
719 | return 0; | |
720 | ||
721 | pgd = pgd_offset_k(addr); | |
722 | if (pgd_none(*pgd)) | |
723 | return 0; | |
724 | ||
725 | pud = pud_offset(pgd, addr); | |
726 | if (pud_none(*pud)) | |
727 | return 0; | |
728 | ||
729 | pmd = pmd_offset(pud, addr); | |
730 | if (pmd_none(*pmd)) | |
731 | return 0; | |
732 | if (pmd_large(*pmd)) | |
733 | return pfn_valid(pmd_pfn(*pmd)); | |
734 | ||
735 | pte = pte_offset_kernel(pmd, addr); | |
736 | if (pte_none(*pte)) | |
737 | return 0; | |
738 | return pfn_valid(pte_pfn(*pte)); | |
739 | } | |
740 | ||
741 | #ifdef CONFIG_SYSCTL | |
742 | #include <linux/sysctl.h> | |
743 | ||
744 | extern int exception_trace, page_fault_trace; | |
745 | ||
746 | static ctl_table debug_table2[] = { | |
747 | { 99, "exception-trace", &exception_trace, sizeof(int), 0644, NULL, | |
748 | proc_dointvec }, | |
1da177e4 LT |
749 | { 0, } |
750 | }; | |
751 | ||
752 | static ctl_table debug_root_table2[] = { | |
753 | { .ctl_name = CTL_DEBUG, .procname = "debug", .mode = 0555, | |
754 | .child = debug_table2 }, | |
755 | { 0 }, | |
756 | }; | |
757 | ||
758 | static __init int x8664_sysctl_init(void) | |
759 | { | |
760 | register_sysctl_table(debug_root_table2, 1); | |
761 | return 0; | |
762 | } | |
763 | __initcall(x8664_sysctl_init); | |
764 | #endif | |
765 | ||
1e014410 AK |
766 | /* A pseudo VMAs to allow ptrace access for the vsyscall page. This only |
767 | covers the 64bit vsyscall page now. 32bit has a real VMA now and does | |
768 | not need special handling anymore. */ | |
1da177e4 LT |
769 | |
770 | static struct vm_area_struct gate_vma = { | |
771 | .vm_start = VSYSCALL_START, | |
772 | .vm_end = VSYSCALL_END, | |
773 | .vm_page_prot = PAGE_READONLY | |
774 | }; | |
775 | ||
1da177e4 LT |
776 | struct vm_area_struct *get_gate_vma(struct task_struct *tsk) |
777 | { | |
778 | #ifdef CONFIG_IA32_EMULATION | |
1e014410 AK |
779 | if (test_tsk_thread_flag(tsk, TIF_IA32)) |
780 | return NULL; | |
1da177e4 LT |
781 | #endif |
782 | return &gate_vma; | |
783 | } | |
784 | ||
785 | int in_gate_area(struct task_struct *task, unsigned long addr) | |
786 | { | |
787 | struct vm_area_struct *vma = get_gate_vma(task); | |
1e014410 AK |
788 | if (!vma) |
789 | return 0; | |
1da177e4 LT |
790 | return (addr >= vma->vm_start) && (addr < vma->vm_end); |
791 | } | |
792 | ||
793 | /* Use this when you have no reliable task/vma, typically from interrupt | |
794 | * context. It is less reliable than using the task's vma and may give | |
795 | * false positives. | |
796 | */ | |
797 | int in_gate_area_no_task(unsigned long addr) | |
798 | { | |
1e014410 | 799 | return (addr >= VSYSCALL_START) && (addr < VSYSCALL_END); |
1da177e4 | 800 | } |