]>
Commit | Line | Data |
---|---|---|
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 | ||
1da177e4 LT |
9 | #include <linux/signal.h> |
10 | #include <linux/sched.h> | |
11 | #include <linux/kernel.h> | |
12 | #include <linux/errno.h> | |
13 | #include <linux/string.h> | |
14 | #include <linux/types.h> | |
15 | #include <linux/ptrace.h> | |
16 | #include <linux/mman.h> | |
17 | #include <linux/mm.h> | |
18 | #include <linux/swap.h> | |
19 | #include <linux/smp.h> | |
20 | #include <linux/init.h> | |
11034d55 | 21 | #include <linux/initrd.h> |
1da177e4 LT |
22 | #include <linux/pagemap.h> |
23 | #include <linux/bootmem.h> | |
24 | #include <linux/proc_fs.h> | |
59170891 | 25 | #include <linux/pci.h> |
6fb14755 | 26 | #include <linux/pfn.h> |
c9cf5528 | 27 | #include <linux/poison.h> |
17a941d8 | 28 | #include <linux/dma-mapping.h> |
44df75e6 MT |
29 | #include <linux/module.h> |
30 | #include <linux/memory_hotplug.h> | |
ae32b129 | 31 | #include <linux/nmi.h> |
1da177e4 LT |
32 | |
33 | #include <asm/processor.h> | |
46eaa670 | 34 | #include <asm/bios_ebda.h> |
1da177e4 LT |
35 | #include <asm/system.h> |
36 | #include <asm/uaccess.h> | |
37 | #include <asm/pgtable.h> | |
38 | #include <asm/pgalloc.h> | |
39 | #include <asm/dma.h> | |
40 | #include <asm/fixmap.h> | |
41 | #include <asm/e820.h> | |
42 | #include <asm/apic.h> | |
43 | #include <asm/tlb.h> | |
44 | #include <asm/mmu_context.h> | |
45 | #include <asm/proto.h> | |
46 | #include <asm/smp.h> | |
2bc0414e | 47 | #include <asm/sections.h> |
718fc13b | 48 | #include <asm/kdebug.h> |
aaa64e04 | 49 | #include <asm/numa.h> |
7bfeab9a | 50 | #include <asm/cacheflush.h> |
1da177e4 | 51 | |
064d25f1 YL |
52 | /* |
53 | * end_pfn only includes RAM, while max_pfn_mapped includes all e820 entries. | |
54 | * The direct mapping extends to max_pfn_mapped, so that we can directly access | |
55 | * apertures, ACPI and other tables without having to play with fixmaps. | |
56 | */ | |
f361a450 | 57 | unsigned long max_low_pfn_mapped; |
064d25f1 YL |
58 | unsigned long max_pfn_mapped; |
59 | ||
e18c6874 AK |
60 | static unsigned long dma_reserve __initdata; |
61 | ||
1da177e4 LT |
62 | DEFINE_PER_CPU(struct mmu_gather, mmu_gathers); |
63 | ||
a06de630 | 64 | int direct_gbpages |
00d1c5e0 IM |
65 | #ifdef CONFIG_DIRECT_GBPAGES |
66 | = 1 | |
67 | #endif | |
68 | ; | |
69 | ||
70 | static int __init parse_direct_gbpages_off(char *arg) | |
71 | { | |
72 | direct_gbpages = 0; | |
73 | return 0; | |
74 | } | |
75 | early_param("nogbpages", parse_direct_gbpages_off); | |
76 | ||
77 | static int __init parse_direct_gbpages_on(char *arg) | |
78 | { | |
79 | direct_gbpages = 1; | |
80 | return 0; | |
81 | } | |
82 | early_param("gbpages", parse_direct_gbpages_on); | |
83 | ||
1da177e4 LT |
84 | /* |
85 | * NOTE: pagetable_init alloc all the fixmap pagetables contiguous on the | |
86 | * physical space so we can cache the place of the first one and move | |
87 | * around without checking the pgd every time. | |
88 | */ | |
89 | ||
1da177e4 LT |
90 | int after_bootmem; |
91 | ||
be43d728 | 92 | pteval_t __supported_pte_mask __read_mostly = ~_PAGE_IOMAP; |
bd220a24 YL |
93 | EXPORT_SYMBOL_GPL(__supported_pte_mask); |
94 | ||
95 | static int do_not_nx __cpuinitdata; | |
96 | ||
deed05b7 IM |
97 | /* |
98 | * noexec=on|off | |
99 | * Control non-executable mappings for 64-bit processes. | |
100 | * | |
101 | * on Enable (default) | |
102 | * off Disable | |
103 | */ | |
bd220a24 YL |
104 | static int __init nonx_setup(char *str) |
105 | { | |
106 | if (!str) | |
107 | return -EINVAL; | |
108 | if (!strncmp(str, "on", 2)) { | |
109 | __supported_pte_mask |= _PAGE_NX; | |
110 | do_not_nx = 0; | |
111 | } else if (!strncmp(str, "off", 3)) { | |
112 | do_not_nx = 1; | |
113 | __supported_pte_mask &= ~_PAGE_NX; | |
114 | } | |
115 | return 0; | |
116 | } | |
117 | early_param("noexec", nonx_setup); | |
118 | ||
119 | void __cpuinit check_efer(void) | |
120 | { | |
121 | unsigned long efer; | |
122 | ||
123 | rdmsrl(MSR_EFER, efer); | |
124 | if (!(efer & EFER_NX) || do_not_nx) | |
125 | __supported_pte_mask &= ~_PAGE_NX; | |
126 | } | |
127 | ||
128 | int force_personality32; | |
129 | ||
deed05b7 IM |
130 | /* |
131 | * noexec32=on|off | |
132 | * Control non executable heap for 32bit processes. | |
133 | * To control the stack too use noexec=off | |
134 | * | |
135 | * on PROT_READ does not imply PROT_EXEC for 32-bit processes (default) | |
136 | * off PROT_READ implies PROT_EXEC | |
137 | */ | |
bd220a24 YL |
138 | static int __init nonx32_setup(char *str) |
139 | { | |
140 | if (!strcmp(str, "on")) | |
141 | force_personality32 &= ~READ_IMPLIES_EXEC; | |
142 | else if (!strcmp(str, "off")) | |
143 | force_personality32 |= READ_IMPLIES_EXEC; | |
144 | return 1; | |
145 | } | |
146 | __setup("noexec32=", nonx32_setup); | |
147 | ||
8d6ea967 MS |
148 | /* |
149 | * NOTE: This function is marked __ref because it calls __init function | |
150 | * (alloc_bootmem_pages). It's safe to do it ONLY when after_bootmem == 0. | |
151 | */ | |
152 | static __ref void *spp_getpage(void) | |
14a62c34 | 153 | { |
1da177e4 | 154 | void *ptr; |
14a62c34 | 155 | |
1da177e4 | 156 | if (after_bootmem) |
14a62c34 | 157 | ptr = (void *) get_zeroed_page(GFP_ATOMIC); |
1da177e4 LT |
158 | else |
159 | ptr = alloc_bootmem_pages(PAGE_SIZE); | |
14a62c34 TG |
160 | |
161 | if (!ptr || ((unsigned long)ptr & ~PAGE_MASK)) { | |
162 | panic("set_pte_phys: cannot allocate page data %s\n", | |
163 | after_bootmem ? "after bootmem" : ""); | |
164 | } | |
1da177e4 | 165 | |
10f22dde | 166 | pr_debug("spp_getpage %p\n", ptr); |
14a62c34 | 167 | |
1da177e4 | 168 | return ptr; |
14a62c34 | 169 | } |
1da177e4 | 170 | |
d494a961 | 171 | void |
0814e0ba | 172 | set_pte_vaddr_pud(pud_t *pud_page, unsigned long vaddr, pte_t new_pte) |
1da177e4 | 173 | { |
1da177e4 LT |
174 | pud_t *pud; |
175 | pmd_t *pmd; | |
d494a961 | 176 | pte_t *pte; |
1da177e4 | 177 | |
0814e0ba | 178 | pud = pud_page + pud_index(vaddr); |
1da177e4 | 179 | if (pud_none(*pud)) { |
14a62c34 | 180 | pmd = (pmd_t *) spp_getpage(); |
bb23e403 | 181 | pud_populate(&init_mm, pud, pmd); |
1da177e4 | 182 | if (pmd != pmd_offset(pud, 0)) { |
10f22dde | 183 | printk(KERN_ERR "PAGETABLE BUG #01! %p <-> %p\n", |
14a62c34 | 184 | pmd, pmd_offset(pud, 0)); |
1da177e4 LT |
185 | return; |
186 | } | |
187 | } | |
188 | pmd = pmd_offset(pud, vaddr); | |
189 | if (pmd_none(*pmd)) { | |
190 | pte = (pte_t *) spp_getpage(); | |
bb23e403 | 191 | pmd_populate_kernel(&init_mm, pmd, pte); |
1da177e4 | 192 | if (pte != pte_offset_kernel(pmd, 0)) { |
10f22dde | 193 | printk(KERN_ERR "PAGETABLE BUG #02!\n"); |
1da177e4 LT |
194 | return; |
195 | } | |
196 | } | |
1da177e4 LT |
197 | |
198 | pte = pte_offset_kernel(pmd, vaddr); | |
1da177e4 LT |
199 | set_pte(pte, new_pte); |
200 | ||
201 | /* | |
202 | * It's enough to flush this one mapping. | |
203 | * (PGE mappings get flushed as well) | |
204 | */ | |
205 | __flush_tlb_one(vaddr); | |
206 | } | |
207 | ||
0814e0ba EH |
208 | void |
209 | set_pte_vaddr(unsigned long vaddr, pte_t pteval) | |
210 | { | |
211 | pgd_t *pgd; | |
212 | pud_t *pud_page; | |
213 | ||
214 | pr_debug("set_pte_vaddr %lx to %lx\n", vaddr, native_pte_val(pteval)); | |
215 | ||
216 | pgd = pgd_offset_k(vaddr); | |
217 | if (pgd_none(*pgd)) { | |
218 | printk(KERN_ERR | |
219 | "PGD FIXMAP MISSING, it should be setup in head.S!\n"); | |
220 | return; | |
221 | } | |
222 | pud_page = (pud_t*)pgd_page_vaddr(*pgd); | |
223 | set_pte_vaddr_pud(pud_page, vaddr, pteval); | |
224 | } | |
225 | ||
3a9e189d JS |
226 | /* |
227 | * Create large page table mappings for a range of physical addresses. | |
228 | */ | |
229 | static void __init __init_extra_mapping(unsigned long phys, unsigned long size, | |
230 | pgprot_t prot) | |
231 | { | |
232 | pgd_t *pgd; | |
233 | pud_t *pud; | |
234 | pmd_t *pmd; | |
235 | ||
236 | BUG_ON((phys & ~PMD_MASK) || (size & ~PMD_MASK)); | |
237 | for (; size; phys += PMD_SIZE, size -= PMD_SIZE) { | |
238 | pgd = pgd_offset_k((unsigned long)__va(phys)); | |
239 | if (pgd_none(*pgd)) { | |
240 | pud = (pud_t *) spp_getpage(); | |
241 | set_pgd(pgd, __pgd(__pa(pud) | _KERNPG_TABLE | | |
242 | _PAGE_USER)); | |
243 | } | |
244 | pud = pud_offset(pgd, (unsigned long)__va(phys)); | |
245 | if (pud_none(*pud)) { | |
246 | pmd = (pmd_t *) spp_getpage(); | |
247 | set_pud(pud, __pud(__pa(pmd) | _KERNPG_TABLE | | |
248 | _PAGE_USER)); | |
249 | } | |
250 | pmd = pmd_offset(pud, phys); | |
251 | BUG_ON(!pmd_none(*pmd)); | |
252 | set_pmd(pmd, __pmd(phys | pgprot_val(prot))); | |
253 | } | |
254 | } | |
255 | ||
256 | void __init init_extra_mapping_wb(unsigned long phys, unsigned long size) | |
257 | { | |
258 | __init_extra_mapping(phys, size, PAGE_KERNEL_LARGE); | |
259 | } | |
260 | ||
261 | void __init init_extra_mapping_uc(unsigned long phys, unsigned long size) | |
262 | { | |
263 | __init_extra_mapping(phys, size, PAGE_KERNEL_LARGE_NOCACHE); | |
264 | } | |
265 | ||
31eedd82 | 266 | /* |
88f3aec7 IM |
267 | * The head.S code sets up the kernel high mapping: |
268 | * | |
269 | * from __START_KERNEL_map to __START_KERNEL_map + size (== _end-_text) | |
31eedd82 TG |
270 | * |
271 | * phys_addr holds the negative offset to the kernel, which is added | |
272 | * to the compile time generated pmds. This results in invalid pmds up | |
273 | * to the point where we hit the physaddr 0 mapping. | |
274 | * | |
275 | * We limit the mappings to the region from _text to _end. _end is | |
276 | * rounded up to the 2MB boundary. This catches the invalid pmds as | |
277 | * well, as they are located before _text: | |
278 | */ | |
279 | void __init cleanup_highmap(void) | |
280 | { | |
281 | unsigned long vaddr = __START_KERNEL_map; | |
d86bb0da | 282 | unsigned long end = roundup((unsigned long)_end, PMD_SIZE) - 1; |
31eedd82 TG |
283 | pmd_t *pmd = level2_kernel_pgt; |
284 | pmd_t *last_pmd = pmd + PTRS_PER_PMD; | |
285 | ||
286 | for (; pmd < last_pmd; pmd++, vaddr += PMD_SIZE) { | |
2884f110 | 287 | if (pmd_none(*pmd)) |
31eedd82 TG |
288 | continue; |
289 | if (vaddr < (unsigned long) _text || vaddr > end) | |
290 | set_pmd(pmd, __pmd(0)); | |
291 | } | |
292 | } | |
293 | ||
75175278 AK |
294 | static unsigned long __initdata table_start; |
295 | static unsigned long __meminitdata table_end; | |
d86623a0 | 296 | static unsigned long __meminitdata table_top; |
1da177e4 | 297 | |
9482ac6e | 298 | static __ref void *alloc_low_page(unsigned long *phys) |
14a62c34 | 299 | { |
dafe41ee | 300 | unsigned long pfn = table_end++; |
1da177e4 LT |
301 | void *adr; |
302 | ||
44df75e6 MT |
303 | if (after_bootmem) { |
304 | adr = (void *)get_zeroed_page(GFP_ATOMIC); | |
305 | *phys = __pa(adr); | |
14a62c34 | 306 | |
44df75e6 MT |
307 | return adr; |
308 | } | |
309 | ||
d86623a0 | 310 | if (pfn >= table_top) |
14a62c34 | 311 | panic("alloc_low_page: ran out of memory"); |
dafe41ee | 312 | |
14941779 | 313 | adr = early_memremap(pfn * PAGE_SIZE, PAGE_SIZE); |
44df75e6 | 314 | memset(adr, 0, PAGE_SIZE); |
dafe41ee VG |
315 | *phys = pfn * PAGE_SIZE; |
316 | return adr; | |
317 | } | |
1da177e4 | 318 | |
9482ac6e | 319 | static __ref void unmap_low_page(void *adr) |
14a62c34 | 320 | { |
44df75e6 MT |
321 | if (after_bootmem) |
322 | return; | |
323 | ||
dafe41ee | 324 | early_iounmap(adr, PAGE_SIZE); |
14a62c34 | 325 | } |
1da177e4 | 326 | |
7b16eb89 | 327 | static unsigned long __meminit |
b27a43c1 SS |
328 | phys_pte_init(pte_t *pte_page, unsigned long addr, unsigned long end, |
329 | pgprot_t prot) | |
4f9c11dd JF |
330 | { |
331 | unsigned pages = 0; | |
7b16eb89 | 332 | unsigned long last_map_addr = end; |
4f9c11dd | 333 | int i; |
7b16eb89 | 334 | |
4f9c11dd JF |
335 | pte_t *pte = pte_page + pte_index(addr); |
336 | ||
337 | for(i = pte_index(addr); i < PTRS_PER_PTE; i++, addr += PAGE_SIZE, pte++) { | |
338 | ||
339 | if (addr >= end) { | |
340 | if (!after_bootmem) { | |
341 | for(; i < PTRS_PER_PTE; i++, pte++) | |
342 | set_pte(pte, __pte(0)); | |
343 | } | |
344 | break; | |
345 | } | |
346 | ||
b27a43c1 SS |
347 | /* |
348 | * We will re-use the existing mapping. | |
349 | * Xen for example has some special requirements, like mapping | |
350 | * pagetable pages as RO. So assume someone who pre-setup | |
351 | * these mappings are more intelligent. | |
352 | */ | |
3afa3949 YL |
353 | if (pte_val(*pte)) { |
354 | pages++; | |
4f9c11dd | 355 | continue; |
3afa3949 | 356 | } |
4f9c11dd JF |
357 | |
358 | if (0) | |
359 | printk(" pte=%p addr=%lx pte=%016lx\n", | |
360 | pte, addr, pfn_pte(addr >> PAGE_SHIFT, PAGE_KERNEL).pte); | |
4f9c11dd | 361 | pages++; |
b27a43c1 | 362 | set_pte(pte, pfn_pte(addr >> PAGE_SHIFT, prot)); |
7b16eb89 | 363 | last_map_addr = (addr & PAGE_MASK) + PAGE_SIZE; |
4f9c11dd | 364 | } |
a2699e47 | 365 | |
4f9c11dd | 366 | update_page_count(PG_LEVEL_4K, pages); |
7b16eb89 YL |
367 | |
368 | return last_map_addr; | |
4f9c11dd JF |
369 | } |
370 | ||
7b16eb89 | 371 | static unsigned long __meminit |
b27a43c1 SS |
372 | phys_pte_update(pmd_t *pmd, unsigned long address, unsigned long end, |
373 | pgprot_t prot) | |
4f9c11dd JF |
374 | { |
375 | pte_t *pte = (pte_t *)pmd_page_vaddr(*pmd); | |
376 | ||
b27a43c1 | 377 | return phys_pte_init(pte, address, end, prot); |
4f9c11dd JF |
378 | } |
379 | ||
cc615032 | 380 | static unsigned long __meminit |
b50efd2a | 381 | phys_pmd_init(pmd_t *pmd_page, unsigned long address, unsigned long end, |
b27a43c1 | 382 | unsigned long page_size_mask, pgprot_t prot) |
44df75e6 | 383 | { |
ce0c0e50 | 384 | unsigned long pages = 0; |
7b16eb89 | 385 | unsigned long last_map_addr = end; |
ce0c0e50 | 386 | |
6ad91658 | 387 | int i = pmd_index(address); |
44df75e6 | 388 | |
6ad91658 | 389 | for (; i < PTRS_PER_PMD; i++, address += PMD_SIZE) { |
4f9c11dd | 390 | unsigned long pte_phys; |
6ad91658 | 391 | pmd_t *pmd = pmd_page + pmd_index(address); |
4f9c11dd | 392 | pte_t *pte; |
b27a43c1 | 393 | pgprot_t new_prot = prot; |
44df75e6 | 394 | |
5f51e139 | 395 | if (address >= end) { |
14a62c34 | 396 | if (!after_bootmem) { |
5f51e139 JB |
397 | for (; i < PTRS_PER_PMD; i++, pmd++) |
398 | set_pmd(pmd, __pmd(0)); | |
14a62c34 | 399 | } |
44df75e6 MT |
400 | break; |
401 | } | |
6ad91658 | 402 | |
4f9c11dd | 403 | if (pmd_val(*pmd)) { |
8ae3a5a8 JB |
404 | if (!pmd_large(*pmd)) { |
405 | spin_lock(&init_mm.page_table_lock); | |
7b16eb89 | 406 | last_map_addr = phys_pte_update(pmd, address, |
b27a43c1 | 407 | end, prot); |
8ae3a5a8 | 408 | spin_unlock(&init_mm.page_table_lock); |
a2699e47 | 409 | continue; |
8ae3a5a8 | 410 | } |
b27a43c1 SS |
411 | /* |
412 | * If we are ok with PG_LEVEL_2M mapping, then we will | |
413 | * use the existing mapping, | |
414 | * | |
415 | * Otherwise, we will split the large page mapping but | |
416 | * use the same existing protection bits except for | |
417 | * large page, so that we don't violate Intel's TLB | |
418 | * Application note (317080) which says, while changing | |
419 | * the page sizes, new and old translations should | |
420 | * not differ with respect to page frame and | |
421 | * attributes. | |
422 | */ | |
3afa3949 YL |
423 | if (page_size_mask & (1 << PG_LEVEL_2M)) { |
424 | pages++; | |
b27a43c1 | 425 | continue; |
3afa3949 | 426 | } |
b27a43c1 | 427 | new_prot = pte_pgprot(pte_clrhuge(*(pte_t *)pmd)); |
4f9c11dd JF |
428 | } |
429 | ||
b50efd2a | 430 | if (page_size_mask & (1<<PG_LEVEL_2M)) { |
4f9c11dd | 431 | pages++; |
8ae3a5a8 | 432 | spin_lock(&init_mm.page_table_lock); |
4f9c11dd | 433 | set_pte((pte_t *)pmd, |
b27a43c1 SS |
434 | pfn_pte(address >> PAGE_SHIFT, |
435 | __pgprot(pgprot_val(prot) | _PAGE_PSE))); | |
8ae3a5a8 | 436 | spin_unlock(&init_mm.page_table_lock); |
7b16eb89 | 437 | last_map_addr = (address & PMD_MASK) + PMD_SIZE; |
6ad91658 | 438 | continue; |
4f9c11dd | 439 | } |
6ad91658 | 440 | |
4f9c11dd | 441 | pte = alloc_low_page(&pte_phys); |
b27a43c1 | 442 | last_map_addr = phys_pte_init(pte, address, end, new_prot); |
4f9c11dd JF |
443 | unmap_low_page(pte); |
444 | ||
8ae3a5a8 | 445 | spin_lock(&init_mm.page_table_lock); |
4f9c11dd | 446 | pmd_populate_kernel(&init_mm, pmd, __va(pte_phys)); |
8ae3a5a8 | 447 | spin_unlock(&init_mm.page_table_lock); |
44df75e6 | 448 | } |
ce0c0e50 | 449 | update_page_count(PG_LEVEL_2M, pages); |
7b16eb89 | 450 | return last_map_addr; |
44df75e6 MT |
451 | } |
452 | ||
cc615032 | 453 | static unsigned long __meminit |
b50efd2a | 454 | phys_pmd_update(pud_t *pud, unsigned long address, unsigned long end, |
b27a43c1 | 455 | unsigned long page_size_mask, pgprot_t prot) |
44df75e6 | 456 | { |
14a62c34 | 457 | pmd_t *pmd = pmd_offset(pud, 0); |
cc615032 AK |
458 | unsigned long last_map_addr; |
459 | ||
b27a43c1 | 460 | last_map_addr = phys_pmd_init(pmd, address, end, page_size_mask, prot); |
6ad91658 | 461 | __flush_tlb_all(); |
cc615032 | 462 | return last_map_addr; |
44df75e6 MT |
463 | } |
464 | ||
cc615032 | 465 | static unsigned long __meminit |
b50efd2a YL |
466 | phys_pud_init(pud_t *pud_page, unsigned long addr, unsigned long end, |
467 | unsigned long page_size_mask) | |
14a62c34 | 468 | { |
ce0c0e50 | 469 | unsigned long pages = 0; |
cc615032 | 470 | unsigned long last_map_addr = end; |
6ad91658 | 471 | int i = pud_index(addr); |
44df75e6 | 472 | |
14a62c34 | 473 | for (; i < PTRS_PER_PUD; i++, addr = (addr & PUD_MASK) + PUD_SIZE) { |
6ad91658 KM |
474 | unsigned long pmd_phys; |
475 | pud_t *pud = pud_page + pud_index(addr); | |
1da177e4 | 476 | pmd_t *pmd; |
b27a43c1 | 477 | pgprot_t prot = PAGE_KERNEL; |
1da177e4 | 478 | |
6ad91658 | 479 | if (addr >= end) |
1da177e4 | 480 | break; |
1da177e4 | 481 | |
14a62c34 TG |
482 | if (!after_bootmem && |
483 | !e820_any_mapped(addr, addr+PUD_SIZE, 0)) { | |
484 | set_pud(pud, __pud(0)); | |
1da177e4 | 485 | continue; |
14a62c34 | 486 | } |
1da177e4 | 487 | |
6ad91658 | 488 | if (pud_val(*pud)) { |
a2699e47 | 489 | if (!pud_large(*pud)) { |
b50efd2a | 490 | last_map_addr = phys_pmd_update(pud, addr, end, |
b27a43c1 | 491 | page_size_mask, prot); |
a2699e47 SS |
492 | continue; |
493 | } | |
b27a43c1 SS |
494 | /* |
495 | * If we are ok with PG_LEVEL_1G mapping, then we will | |
496 | * use the existing mapping. | |
497 | * | |
498 | * Otherwise, we will split the gbpage mapping but use | |
499 | * the same existing protection bits except for large | |
500 | * page, so that we don't violate Intel's TLB | |
501 | * Application note (317080) which says, while changing | |
502 | * the page sizes, new and old translations should | |
503 | * not differ with respect to page frame and | |
504 | * attributes. | |
505 | */ | |
3afa3949 YL |
506 | if (page_size_mask & (1 << PG_LEVEL_1G)) { |
507 | pages++; | |
b27a43c1 | 508 | continue; |
3afa3949 | 509 | } |
b27a43c1 | 510 | prot = pte_pgprot(pte_clrhuge(*(pte_t *)pud)); |
ef925766 AK |
511 | } |
512 | ||
b50efd2a | 513 | if (page_size_mask & (1<<PG_LEVEL_1G)) { |
ce0c0e50 | 514 | pages++; |
8ae3a5a8 | 515 | spin_lock(&init_mm.page_table_lock); |
ef925766 AK |
516 | set_pte((pte_t *)pud, |
517 | pfn_pte(addr >> PAGE_SHIFT, PAGE_KERNEL_LARGE)); | |
8ae3a5a8 | 518 | spin_unlock(&init_mm.page_table_lock); |
cc615032 | 519 | last_map_addr = (addr & PUD_MASK) + PUD_SIZE; |
6ad91658 KM |
520 | continue; |
521 | } | |
522 | ||
dafe41ee | 523 | pmd = alloc_low_page(&pmd_phys); |
b27a43c1 SS |
524 | last_map_addr = phys_pmd_init(pmd, addr, end, page_size_mask, |
525 | prot); | |
4f9c11dd | 526 | unmap_low_page(pmd); |
8ae3a5a8 JB |
527 | |
528 | spin_lock(&init_mm.page_table_lock); | |
4f9c11dd | 529 | pud_populate(&init_mm, pud, __va(pmd_phys)); |
44df75e6 | 530 | spin_unlock(&init_mm.page_table_lock); |
1da177e4 | 531 | } |
1a2b4412 | 532 | __flush_tlb_all(); |
a2699e47 | 533 | |
ce0c0e50 | 534 | update_page_count(PG_LEVEL_1G, pages); |
cc615032 | 535 | |
1a0db38e | 536 | return last_map_addr; |
14a62c34 | 537 | } |
1da177e4 | 538 | |
4f9c11dd | 539 | static unsigned long __meminit |
b50efd2a YL |
540 | phys_pud_update(pgd_t *pgd, unsigned long addr, unsigned long end, |
541 | unsigned long page_size_mask) | |
4f9c11dd JF |
542 | { |
543 | pud_t *pud; | |
544 | ||
545 | pud = (pud_t *)pgd_page_vaddr(*pgd); | |
546 | ||
b50efd2a | 547 | return phys_pud_init(pud, addr, end, page_size_mask); |
4f9c11dd JF |
548 | } |
549 | ||
0b8fdcbc SS |
550 | static void __init find_early_table_space(unsigned long end, int use_pse, |
551 | int use_gbpages) | |
1da177e4 | 552 | { |
c2e6d65b | 553 | unsigned long puds, pmds, ptes, tables, start; |
1da177e4 LT |
554 | |
555 | puds = (end + PUD_SIZE - 1) >> PUD_SHIFT; | |
d86bb0da | 556 | tables = roundup(puds * sizeof(pud_t), PAGE_SIZE); |
0b8fdcbc | 557 | if (use_gbpages) { |
c2e6d65b YL |
558 | unsigned long extra; |
559 | extra = end - ((end>>PUD_SHIFT) << PUD_SHIFT); | |
560 | pmds = (extra + PMD_SIZE - 1) >> PMD_SHIFT; | |
561 | } else | |
562 | pmds = (end + PMD_SIZE - 1) >> PMD_SHIFT; | |
d86bb0da | 563 | tables += roundup(pmds * sizeof(pmd_t), PAGE_SIZE); |
c2e6d65b | 564 | |
0b8fdcbc | 565 | if (use_pse) { |
c2e6d65b YL |
566 | unsigned long extra; |
567 | extra = end - ((end>>PMD_SHIFT) << PMD_SHIFT); | |
568 | ptes = (extra + PAGE_SIZE - 1) >> PAGE_SHIFT; | |
569 | } else | |
570 | ptes = (end + PAGE_SIZE - 1) >> PAGE_SHIFT; | |
d86bb0da | 571 | tables += roundup(ptes * sizeof(pte_t), PAGE_SIZE); |
1da177e4 | 572 | |
14a62c34 TG |
573 | /* |
574 | * RED-PEN putting page tables only on node 0 could | |
575 | * cause a hotspot and fill up ZONE_DMA. The page tables | |
576 | * need roughly 0.5KB per GB. | |
577 | */ | |
578 | start = 0x8000; | |
24a5da73 | 579 | table_start = find_e820_area(start, end, tables, PAGE_SIZE); |
1da177e4 LT |
580 | if (table_start == -1UL) |
581 | panic("Cannot find space for the kernel page tables"); | |
582 | ||
583 | table_start >>= PAGE_SHIFT; | |
584 | table_end = table_start; | |
d86623a0 | 585 | table_top = table_start + (tables >> PAGE_SHIFT); |
44df75e6 | 586 | |
d86623a0 YL |
587 | printk(KERN_DEBUG "kernel direct mapping tables up to %lx @ %lx-%lx\n", |
588 | end, table_start << PAGE_SHIFT, table_top << PAGE_SHIFT); | |
1da177e4 LT |
589 | } |
590 | ||
ef925766 AK |
591 | static void __init init_gbpages(void) |
592 | { | |
593 | if (direct_gbpages && cpu_has_gbpages) | |
594 | printk(KERN_INFO "Using GB pages for direct mapping\n"); | |
595 | else | |
596 | direct_gbpages = 0; | |
597 | } | |
598 | ||
f5495506 | 599 | static unsigned long __meminit kernel_physical_mapping_init(unsigned long start, |
b50efd2a YL |
600 | unsigned long end, |
601 | unsigned long page_size_mask) | |
14a62c34 | 602 | { |
1da177e4 | 603 | |
b50efd2a | 604 | unsigned long next, last_map_addr = end; |
1da177e4 LT |
605 | |
606 | start = (unsigned long)__va(start); | |
607 | end = (unsigned long)__va(end); | |
608 | ||
609 | for (; start < end; start = next) { | |
44df75e6 | 610 | pgd_t *pgd = pgd_offset_k(start); |
14a62c34 | 611 | unsigned long pud_phys; |
44df75e6 MT |
612 | pud_t *pud; |
613 | ||
e22146e6 | 614 | next = (start + PGDIR_SIZE) & PGDIR_MASK; |
4f9c11dd JF |
615 | if (next > end) |
616 | next = end; | |
617 | ||
618 | if (pgd_val(*pgd)) { | |
b50efd2a YL |
619 | last_map_addr = phys_pud_update(pgd, __pa(start), |
620 | __pa(end), page_size_mask); | |
4f9c11dd JF |
621 | continue; |
622 | } | |
623 | ||
8ae3a5a8 | 624 | pud = alloc_low_page(&pud_phys); |
b50efd2a YL |
625 | last_map_addr = phys_pud_init(pud, __pa(start), __pa(next), |
626 | page_size_mask); | |
4f9c11dd | 627 | unmap_low_page(pud); |
8ae3a5a8 JB |
628 | |
629 | spin_lock(&init_mm.page_table_lock); | |
630 | pgd_populate(&init_mm, pgd, __va(pud_phys)); | |
631 | spin_unlock(&init_mm.page_table_lock); | |
14a62c34 | 632 | } |
a2699e47 | 633 | __flush_tlb_all(); |
1da177e4 | 634 | |
b50efd2a YL |
635 | return last_map_addr; |
636 | } | |
7b16eb89 YL |
637 | |
638 | struct map_range { | |
639 | unsigned long start; | |
640 | unsigned long end; | |
641 | unsigned page_size_mask; | |
642 | }; | |
643 | ||
644 | #define NR_RANGE_MR 5 | |
645 | ||
646 | static int save_mr(struct map_range *mr, int nr_range, | |
647 | unsigned long start_pfn, unsigned long end_pfn, | |
648 | unsigned long page_size_mask) | |
649 | { | |
650 | ||
651 | if (start_pfn < end_pfn) { | |
652 | if (nr_range >= NR_RANGE_MR) | |
653 | panic("run out of range for init_memory_mapping\n"); | |
654 | mr[nr_range].start = start_pfn<<PAGE_SHIFT; | |
655 | mr[nr_range].end = end_pfn<<PAGE_SHIFT; | |
656 | mr[nr_range].page_size_mask = page_size_mask; | |
657 | nr_range++; | |
658 | } | |
659 | ||
660 | return nr_range; | |
661 | } | |
662 | ||
b50efd2a YL |
663 | /* |
664 | * Setup the direct mapping of the physical memory at PAGE_OFFSET. | |
665 | * This runs before bootmem is initialized and gets pages directly from | |
666 | * the physical memory. To access them they are temporarily mapped. | |
667 | */ | |
668 | unsigned long __init_refok init_memory_mapping(unsigned long start, | |
669 | unsigned long end) | |
670 | { | |
7b16eb89 | 671 | unsigned long last_map_addr = 0; |
b50efd2a | 672 | unsigned long page_size_mask = 0; |
c2e6d65b | 673 | unsigned long start_pfn, end_pfn; |
f96f57d9 | 674 | unsigned long pos; |
b50efd2a | 675 | |
7b16eb89 YL |
676 | struct map_range mr[NR_RANGE_MR]; |
677 | int nr_range, i; | |
0b8fdcbc | 678 | int use_pse, use_gbpages; |
7b16eb89 | 679 | |
f96f57d9 | 680 | printk(KERN_INFO "init_memory_mapping: %016lx-%016lx\n", start, end); |
b50efd2a YL |
681 | |
682 | /* | |
683 | * Find space for the kernel direct mapping tables. | |
684 | * | |
685 | * Later we should allocate these tables in the local node of the | |
686 | * memory mapped. Unfortunately this is done currently before the | |
687 | * nodes are discovered. | |
688 | */ | |
7b16eb89 | 689 | if (!after_bootmem) |
b50efd2a | 690 | init_gbpages(); |
b50efd2a | 691 | |
0b8fdcbc SS |
692 | #ifdef CONFIG_DEBUG_PAGEALLOC |
693 | /* | |
694 | * For CONFIG_DEBUG_PAGEALLOC, identity mapping will use small pages. | |
695 | * This will simplify cpa(), which otherwise needs to support splitting | |
696 | * large pages into small in interrupt context, etc. | |
697 | */ | |
698 | use_pse = use_gbpages = 0; | |
699 | #else | |
700 | use_pse = cpu_has_pse; | |
701 | use_gbpages = direct_gbpages; | |
702 | #endif | |
703 | ||
704 | if (use_gbpages) | |
b50efd2a | 705 | page_size_mask |= 1 << PG_LEVEL_1G; |
0b8fdcbc | 706 | if (use_pse) |
b50efd2a YL |
707 | page_size_mask |= 1 << PG_LEVEL_2M; |
708 | ||
7b16eb89 YL |
709 | memset(mr, 0, sizeof(mr)); |
710 | nr_range = 0; | |
711 | ||
712 | /* head if not big page alignment ?*/ | |
c2e6d65b | 713 | start_pfn = start >> PAGE_SHIFT; |
f96f57d9 YL |
714 | pos = start_pfn << PAGE_SHIFT; |
715 | end_pfn = ((pos + (PMD_SIZE - 1)) >> PMD_SHIFT) | |
c2e6d65b | 716 | << (PMD_SHIFT - PAGE_SHIFT); |
f96f57d9 YL |
717 | if (start_pfn < end_pfn) { |
718 | nr_range = save_mr(mr, nr_range, start_pfn, end_pfn, 0); | |
719 | pos = end_pfn << PAGE_SHIFT; | |
720 | } | |
c2e6d65b YL |
721 | |
722 | /* big page (2M) range*/ | |
f96f57d9 | 723 | start_pfn = ((pos + (PMD_SIZE - 1))>>PMD_SHIFT) |
c2e6d65b | 724 | << (PMD_SHIFT - PAGE_SHIFT); |
f96f57d9 | 725 | end_pfn = ((pos + (PUD_SIZE - 1))>>PUD_SHIFT) |
c2e6d65b | 726 | << (PUD_SHIFT - PAGE_SHIFT); |
f96f57d9 YL |
727 | if (end_pfn > ((end>>PMD_SHIFT)<<(PMD_SHIFT - PAGE_SHIFT))) |
728 | end_pfn = ((end>>PMD_SHIFT)<<(PMD_SHIFT - PAGE_SHIFT)); | |
729 | if (start_pfn < end_pfn) { | |
730 | nr_range = save_mr(mr, nr_range, start_pfn, end_pfn, | |
731 | page_size_mask & (1<<PG_LEVEL_2M)); | |
732 | pos = end_pfn << PAGE_SHIFT; | |
733 | } | |
c2e6d65b YL |
734 | |
735 | /* big page (1G) range */ | |
f96f57d9 YL |
736 | start_pfn = ((pos + (PUD_SIZE - 1))>>PUD_SHIFT) |
737 | << (PUD_SHIFT - PAGE_SHIFT); | |
738 | end_pfn = (end >> PUD_SHIFT) << (PUD_SHIFT - PAGE_SHIFT); | |
739 | if (start_pfn < end_pfn) { | |
740 | nr_range = save_mr(mr, nr_range, start_pfn, end_pfn, | |
7b16eb89 YL |
741 | page_size_mask & |
742 | ((1<<PG_LEVEL_2M)|(1<<PG_LEVEL_1G))); | |
f96f57d9 YL |
743 | pos = end_pfn << PAGE_SHIFT; |
744 | } | |
c2e6d65b YL |
745 | |
746 | /* tail is not big page (1G) alignment */ | |
f96f57d9 YL |
747 | start_pfn = ((pos + (PMD_SIZE - 1))>>PMD_SHIFT) |
748 | << (PMD_SHIFT - PAGE_SHIFT); | |
749 | end_pfn = (end >> PMD_SHIFT) << (PMD_SHIFT - PAGE_SHIFT); | |
750 | if (start_pfn < end_pfn) { | |
751 | nr_range = save_mr(mr, nr_range, start_pfn, end_pfn, | |
752 | page_size_mask & (1<<PG_LEVEL_2M)); | |
753 | pos = end_pfn << PAGE_SHIFT; | |
754 | } | |
7b16eb89 | 755 | |
c2e6d65b | 756 | /* tail is not big page (2M) alignment */ |
f96f57d9 | 757 | start_pfn = pos>>PAGE_SHIFT; |
c2e6d65b | 758 | end_pfn = end>>PAGE_SHIFT; |
7b16eb89 YL |
759 | nr_range = save_mr(mr, nr_range, start_pfn, end_pfn, 0); |
760 | ||
9958e810 YL |
761 | /* try to merge same page size and continuous */ |
762 | for (i = 0; nr_range > 1 && i < nr_range - 1; i++) { | |
763 | unsigned long old_start; | |
764 | if (mr[i].end != mr[i+1].start || | |
765 | mr[i].page_size_mask != mr[i+1].page_size_mask) | |
766 | continue; | |
767 | /* move it */ | |
768 | old_start = mr[i].start; | |
769 | memmove(&mr[i], &mr[i+1], | |
770 | (nr_range - 1 - i) * sizeof (struct map_range)); | |
5e72d9e4 | 771 | mr[i--].start = old_start; |
9958e810 YL |
772 | nr_range--; |
773 | } | |
774 | ||
7b16eb89 YL |
775 | for (i = 0; i < nr_range; i++) |
776 | printk(KERN_DEBUG " %010lx - %010lx page %s\n", | |
777 | mr[i].start, mr[i].end, | |
778 | (mr[i].page_size_mask & (1<<PG_LEVEL_1G))?"1G":( | |
779 | (mr[i].page_size_mask & (1<<PG_LEVEL_2M))?"2M":"4k")); | |
780 | ||
781 | if (!after_bootmem) | |
0b8fdcbc | 782 | find_early_table_space(end, use_pse, use_gbpages); |
7b16eb89 YL |
783 | |
784 | for (i = 0; i < nr_range; i++) | |
c2e6d65b | 785 | last_map_addr = kernel_physical_mapping_init( |
7b16eb89 YL |
786 | mr[i].start, mr[i].end, |
787 | mr[i].page_size_mask); | |
b50efd2a | 788 | |
44df75e6 | 789 | if (!after_bootmem) |
f51c9452 | 790 | mmu_cr4_features = read_cr4(); |
1da177e4 | 791 | __flush_tlb_all(); |
75175278 | 792 | |
b50efd2a | 793 | if (!after_bootmem && table_end > table_start) |
24a5da73 YL |
794 | reserve_early(table_start << PAGE_SHIFT, |
795 | table_end << PAGE_SHIFT, "PGTABLE"); | |
272b9cad | 796 | |
b50efd2a YL |
797 | printk(KERN_INFO "last_map_addr: %lx end: %lx\n", |
798 | last_map_addr, end); | |
799 | ||
272b9cad | 800 | if (!after_bootmem) |
b50efd2a | 801 | early_memtest(start, end); |
cc615032 | 802 | |
1a0db38e | 803 | return last_map_addr >> PAGE_SHIFT; |
1da177e4 LT |
804 | } |
805 | ||
2b97690f | 806 | #ifndef CONFIG_NUMA |
1f75d7e3 YL |
807 | void __init initmem_init(unsigned long start_pfn, unsigned long end_pfn) |
808 | { | |
809 | unsigned long bootmap_size, bootmap; | |
810 | ||
811 | bootmap_size = bootmem_bootmap_pages(end_pfn)<<PAGE_SHIFT; | |
812 | bootmap = find_e820_area(0, end_pfn<<PAGE_SHIFT, bootmap_size, | |
813 | PAGE_SIZE); | |
814 | if (bootmap == -1L) | |
815 | panic("Cannot find bootmem map of size %ld\n", bootmap_size); | |
346cafec YL |
816 | /* don't touch min_low_pfn */ |
817 | bootmap_size = init_bootmem_node(NODE_DATA(0), bootmap >> PAGE_SHIFT, | |
818 | 0, end_pfn); | |
1f75d7e3 YL |
819 | e820_register_active_regions(0, start_pfn, end_pfn); |
820 | free_bootmem_with_active_regions(0, end_pfn); | |
821 | early_res_to_bootmem(0, end_pfn<<PAGE_SHIFT); | |
822 | reserve_bootmem(bootmap, bootmap_size, BOOTMEM_DEFAULT); | |
823 | } | |
824 | ||
1da177e4 LT |
825 | void __init paging_init(void) |
826 | { | |
6391af17 | 827 | unsigned long max_zone_pfns[MAX_NR_ZONES]; |
14a62c34 | 828 | |
6391af17 MG |
829 | memset(max_zone_pfns, 0, sizeof(max_zone_pfns)); |
830 | max_zone_pfns[ZONE_DMA] = MAX_DMA_PFN; | |
831 | max_zone_pfns[ZONE_DMA32] = MAX_DMA32_PFN; | |
c987d12f | 832 | max_zone_pfns[ZONE_NORMAL] = max_pfn; |
6391af17 | 833 | |
c987d12f | 834 | memory_present(0, 0, max_pfn); |
44df75e6 | 835 | sparse_init(); |
5cb248ab | 836 | free_area_init_nodes(max_zone_pfns); |
1da177e4 LT |
837 | } |
838 | #endif | |
839 | ||
44df75e6 MT |
840 | /* |
841 | * Memory hotplug specific functions | |
44df75e6 | 842 | */ |
bc02af93 | 843 | #ifdef CONFIG_MEMORY_HOTPLUG |
9d99aaa3 AK |
844 | /* |
845 | * Memory is added always to NORMAL zone. This means you will never get | |
846 | * additional DMA/DMA32 memory. | |
847 | */ | |
bc02af93 | 848 | int arch_add_memory(int nid, u64 start, u64 size) |
44df75e6 | 849 | { |
bc02af93 | 850 | struct pglist_data *pgdat = NODE_DATA(nid); |
776ed98b | 851 | struct zone *zone = pgdat->node_zones + ZONE_NORMAL; |
cc615032 | 852 | unsigned long last_mapped_pfn, start_pfn = start >> PAGE_SHIFT; |
44df75e6 MT |
853 | unsigned long nr_pages = size >> PAGE_SHIFT; |
854 | int ret; | |
855 | ||
60817c9b | 856 | last_mapped_pfn = init_memory_mapping(start, start + size); |
cc615032 AK |
857 | if (last_mapped_pfn > max_pfn_mapped) |
858 | max_pfn_mapped = last_mapped_pfn; | |
45e0b78b | 859 | |
c04fc586 | 860 | ret = __add_pages(nid, zone, start_pfn, nr_pages); |
fe8b868e | 861 | WARN_ON_ONCE(ret); |
44df75e6 | 862 | |
44df75e6 | 863 | return ret; |
44df75e6 | 864 | } |
bc02af93 | 865 | EXPORT_SYMBOL_GPL(arch_add_memory); |
44df75e6 | 866 | |
8243229f | 867 | #if !defined(CONFIG_ACPI_NUMA) && defined(CONFIG_NUMA) |
4942e998 KM |
868 | int memory_add_physaddr_to_nid(u64 start) |
869 | { | |
870 | return 0; | |
871 | } | |
8c2676a5 | 872 | EXPORT_SYMBOL_GPL(memory_add_physaddr_to_nid); |
4942e998 KM |
873 | #endif |
874 | ||
45e0b78b KM |
875 | #endif /* CONFIG_MEMORY_HOTPLUG */ |
876 | ||
ae531c26 AV |
877 | /* |
878 | * devmem_is_allowed() checks to see if /dev/mem access to a certain address | |
879 | * is valid. The argument is a physical page number. | |
880 | * | |
881 | * | |
882 | * On x86, access has to be given to the first megabyte of ram because that area | |
883 | * contains bios code and data regions used by X and dosemu and similar apps. | |
884 | * Access has to be given to non-kernel-ram areas as well, these contain the PCI | |
885 | * mmio resources as well as potential bios/acpi data regions. | |
886 | */ | |
887 | int devmem_is_allowed(unsigned long pagenr) | |
888 | { | |
889 | if (pagenr <= 256) | |
890 | return 1; | |
e8de1481 AV |
891 | if (iomem_is_exclusive(pagenr << PAGE_SHIFT)) |
892 | return 0; | |
ae531c26 AV |
893 | if (!page_is_ram(pagenr)) |
894 | return 1; | |
895 | return 0; | |
896 | } | |
897 | ||
898 | ||
14a62c34 TG |
899 | static struct kcore_list kcore_mem, kcore_vmalloc, kcore_kernel, |
900 | kcore_modules, kcore_vsyscall; | |
1da177e4 LT |
901 | |
902 | void __init mem_init(void) | |
903 | { | |
0a43e4bf | 904 | long codesize, reservedpages, datasize, initsize; |
11a6b0c9 | 905 | unsigned long absent_pages; |
1da177e4 | 906 | |
0dc243ae | 907 | pci_iommu_alloc(); |
1da177e4 | 908 | |
48ddb154 | 909 | /* clear_bss() already clear the empty_zero_page */ |
1da177e4 LT |
910 | |
911 | reservedpages = 0; | |
912 | ||
913 | /* this will put all low memory onto the freelists */ | |
2b97690f | 914 | #ifdef CONFIG_NUMA |
0a43e4bf | 915 | totalram_pages = numa_free_all_bootmem(); |
1da177e4 | 916 | #else |
0a43e4bf | 917 | totalram_pages = free_all_bootmem(); |
1da177e4 | 918 | #endif |
11a6b0c9 YL |
919 | |
920 | absent_pages = absent_pages_in_range(0, max_pfn); | |
921 | reservedpages = max_pfn - totalram_pages - absent_pages; | |
1da177e4 LT |
922 | after_bootmem = 1; |
923 | ||
924 | codesize = (unsigned long) &_etext - (unsigned long) &_text; | |
925 | datasize = (unsigned long) &_edata - (unsigned long) &_etext; | |
926 | initsize = (unsigned long) &__init_end - (unsigned long) &__init_begin; | |
927 | ||
928 | /* Register memory areas for /proc/kcore */ | |
14a62c34 TG |
929 | kclist_add(&kcore_mem, __va(0), max_low_pfn << PAGE_SHIFT); |
930 | kclist_add(&kcore_vmalloc, (void *)VMALLOC_START, | |
1da177e4 LT |
931 | VMALLOC_END-VMALLOC_START); |
932 | kclist_add(&kcore_kernel, &_stext, _end - _stext); | |
933 | kclist_add(&kcore_modules, (void *)MODULES_VADDR, MODULES_LEN); | |
14a62c34 | 934 | kclist_add(&kcore_vsyscall, (void *)VSYSCALL_START, |
1da177e4 LT |
935 | VSYSCALL_END - VSYSCALL_START); |
936 | ||
10f22dde | 937 | printk(KERN_INFO "Memory: %luk/%luk available (%ldk kernel code, " |
11a6b0c9 | 938 | "%ldk absent, %ldk reserved, %ldk data, %ldk init)\n", |
1da177e4 | 939 | (unsigned long) nr_free_pages() << (PAGE_SHIFT-10), |
c987d12f | 940 | max_pfn << (PAGE_SHIFT-10), |
1da177e4 | 941 | codesize >> 10, |
11a6b0c9 | 942 | absent_pages << (PAGE_SHIFT-10), |
1da177e4 LT |
943 | reservedpages << (PAGE_SHIFT-10), |
944 | datasize >> 10, | |
945 | initsize >> 10); | |
1da177e4 LT |
946 | } |
947 | ||
d167a518 | 948 | void free_init_pages(char *what, unsigned long begin, unsigned long end) |
1da177e4 | 949 | { |
bfc734b2 | 950 | unsigned long addr = begin; |
1da177e4 | 951 | |
bfc734b2 | 952 | if (addr >= end) |
d167a518 GH |
953 | return; |
954 | ||
ee01f112 IM |
955 | /* |
956 | * If debugging page accesses then do not free this memory but | |
957 | * mark them not present - any buggy init-section access will | |
958 | * create a kernel page fault: | |
959 | */ | |
960 | #ifdef CONFIG_DEBUG_PAGEALLOC | |
961 | printk(KERN_INFO "debug: unmapping init memory %08lx..%08lx\n", | |
962 | begin, PAGE_ALIGN(end)); | |
963 | set_memory_np(begin, (end - begin) >> PAGE_SHIFT); | |
964 | #else | |
6fb14755 | 965 | printk(KERN_INFO "Freeing %s: %luk freed\n", what, (end - begin) >> 10); |
14a62c34 | 966 | |
bfc734b2 | 967 | for (; addr < end; addr += PAGE_SIZE) { |
e3ebadd9 LT |
968 | ClearPageReserved(virt_to_page(addr)); |
969 | init_page_count(virt_to_page(addr)); | |
970 | memset((void *)(addr & ~(PAGE_SIZE-1)), | |
971 | POISON_FREE_INITMEM, PAGE_SIZE); | |
e3ebadd9 | 972 | free_page(addr); |
1da177e4 LT |
973 | totalram_pages++; |
974 | } | |
ee01f112 | 975 | #endif |
d167a518 GH |
976 | } |
977 | ||
978 | void free_initmem(void) | |
979 | { | |
d167a518 | 980 | free_init_pages("unused kernel memory", |
e3ebadd9 LT |
981 | (unsigned long)(&__init_begin), |
982 | (unsigned long)(&__init_end)); | |
1da177e4 LT |
983 | } |
984 | ||
67df197b | 985 | #ifdef CONFIG_DEBUG_RODATA |
edeed305 AV |
986 | const int rodata_test_data = 0xC3; |
987 | EXPORT_SYMBOL_GPL(rodata_test_data); | |
67df197b | 988 | |
67df197b AV |
989 | void mark_rodata_ro(void) |
990 | { | |
4e4eee0e | 991 | unsigned long start = PFN_ALIGN(_stext), end = PFN_ALIGN(__end_rodata); |
8f0f996e SR |
992 | unsigned long rodata_start = |
993 | ((unsigned long)__start_rodata + PAGE_SIZE - 1) & PAGE_MASK; | |
994 | ||
995 | #ifdef CONFIG_DYNAMIC_FTRACE | |
996 | /* Dynamic tracing modifies the kernel text section */ | |
997 | start = rodata_start; | |
998 | #endif | |
67df197b | 999 | |
6fb14755 | 1000 | printk(KERN_INFO "Write protecting the kernel read-only data: %luk\n", |
e3ebadd9 | 1001 | (end - start) >> 10); |
984bb80d AV |
1002 | set_memory_ro(start, (end - start) >> PAGE_SHIFT); |
1003 | ||
1004 | /* | |
1005 | * The rodata section (but not the kernel text!) should also be | |
1006 | * not-executable. | |
1007 | */ | |
72b59d67 | 1008 | set_memory_nx(rodata_start, (end - rodata_start) >> PAGE_SHIFT); |
67df197b | 1009 | |
1a487252 AV |
1010 | rodata_test(); |
1011 | ||
0c42f392 | 1012 | #ifdef CONFIG_CPA_DEBUG |
10f22dde | 1013 | printk(KERN_INFO "Testing CPA: undo %lx-%lx\n", start, end); |
6d238cc4 | 1014 | set_memory_rw(start, (end-start) >> PAGE_SHIFT); |
0c42f392 | 1015 | |
10f22dde | 1016 | printk(KERN_INFO "Testing CPA: again\n"); |
6d238cc4 | 1017 | set_memory_ro(start, (end-start) >> PAGE_SHIFT); |
0c42f392 | 1018 | #endif |
67df197b | 1019 | } |
4e4eee0e | 1020 | |
67df197b AV |
1021 | #endif |
1022 | ||
1da177e4 LT |
1023 | #ifdef CONFIG_BLK_DEV_INITRD |
1024 | void free_initrd_mem(unsigned long start, unsigned long end) | |
1025 | { | |
e3ebadd9 | 1026 | free_init_pages("initrd memory", start, end); |
1da177e4 LT |
1027 | } |
1028 | #endif | |
1029 | ||
d2dbf343 YL |
1030 | int __init reserve_bootmem_generic(unsigned long phys, unsigned long len, |
1031 | int flags) | |
14a62c34 | 1032 | { |
2b97690f | 1033 | #ifdef CONFIG_NUMA |
8b3cd09e | 1034 | int nid, next_nid; |
6a07a0ed | 1035 | int ret; |
5e58a02a AK |
1036 | #endif |
1037 | unsigned long pfn = phys >> PAGE_SHIFT; | |
14a62c34 | 1038 | |
c987d12f | 1039 | if (pfn >= max_pfn) { |
14a62c34 TG |
1040 | /* |
1041 | * This can happen with kdump kernels when accessing | |
1042 | * firmware tables: | |
1043 | */ | |
67794292 | 1044 | if (pfn < max_pfn_mapped) |
8b2ef1d7 | 1045 | return -EFAULT; |
14a62c34 | 1046 | |
6a07a0ed | 1047 | printk(KERN_ERR "reserve_bootmem: illegal reserve %lx %lu\n", |
5e58a02a | 1048 | phys, len); |
8b2ef1d7 | 1049 | return -EFAULT; |
5e58a02a AK |
1050 | } |
1051 | ||
1052 | /* Should check here against the e820 map to avoid double free */ | |
1053 | #ifdef CONFIG_NUMA | |
8b3cd09e YL |
1054 | nid = phys_to_nid(phys); |
1055 | next_nid = phys_to_nid(phys + len - 1); | |
1056 | if (nid == next_nid) | |
8b2ef1d7 | 1057 | ret = reserve_bootmem_node(NODE_DATA(nid), phys, len, flags); |
8b3cd09e | 1058 | else |
8b2ef1d7 BW |
1059 | ret = reserve_bootmem(phys, len, flags); |
1060 | ||
1061 | if (ret != 0) | |
1062 | return ret; | |
1063 | ||
14a62c34 | 1064 | #else |
72a7fe39 | 1065 | reserve_bootmem(phys, len, BOOTMEM_DEFAULT); |
1da177e4 | 1066 | #endif |
8b3cd09e | 1067 | |
0e0b864e | 1068 | if (phys+len <= MAX_DMA_PFN*PAGE_SIZE) { |
e18c6874 | 1069 | dma_reserve += len / PAGE_SIZE; |
0e0b864e MG |
1070 | set_dma_reserve(dma_reserve); |
1071 | } | |
8b2ef1d7 BW |
1072 | |
1073 | return 0; | |
1da177e4 LT |
1074 | } |
1075 | ||
14a62c34 TG |
1076 | int kern_addr_valid(unsigned long addr) |
1077 | { | |
1da177e4 | 1078 | unsigned long above = ((long)addr) >> __VIRTUAL_MASK_SHIFT; |
14a62c34 TG |
1079 | pgd_t *pgd; |
1080 | pud_t *pud; | |
1081 | pmd_t *pmd; | |
1082 | pte_t *pte; | |
1da177e4 LT |
1083 | |
1084 | if (above != 0 && above != -1UL) | |
14a62c34 TG |
1085 | return 0; |
1086 | ||
1da177e4 LT |
1087 | pgd = pgd_offset_k(addr); |
1088 | if (pgd_none(*pgd)) | |
1089 | return 0; | |
1090 | ||
1091 | pud = pud_offset(pgd, addr); | |
1092 | if (pud_none(*pud)) | |
14a62c34 | 1093 | return 0; |
1da177e4 LT |
1094 | |
1095 | pmd = pmd_offset(pud, addr); | |
1096 | if (pmd_none(*pmd)) | |
1097 | return 0; | |
14a62c34 | 1098 | |
1da177e4 LT |
1099 | if (pmd_large(*pmd)) |
1100 | return pfn_valid(pmd_pfn(*pmd)); | |
1101 | ||
1102 | pte = pte_offset_kernel(pmd, addr); | |
1103 | if (pte_none(*pte)) | |
1104 | return 0; | |
14a62c34 | 1105 | |
1da177e4 LT |
1106 | return pfn_valid(pte_pfn(*pte)); |
1107 | } | |
1108 | ||
14a62c34 TG |
1109 | /* |
1110 | * A pseudo VMA to allow ptrace access for the vsyscall page. This only | |
1111 | * covers the 64bit vsyscall page now. 32bit has a real VMA now and does | |
1112 | * not need special handling anymore: | |
1113 | */ | |
1da177e4 | 1114 | static struct vm_area_struct gate_vma = { |
14a62c34 TG |
1115 | .vm_start = VSYSCALL_START, |
1116 | .vm_end = VSYSCALL_START + (VSYSCALL_MAPPED_PAGES * PAGE_SIZE), | |
1117 | .vm_page_prot = PAGE_READONLY_EXEC, | |
1118 | .vm_flags = VM_READ | VM_EXEC | |
1da177e4 LT |
1119 | }; |
1120 | ||
1da177e4 LT |
1121 | struct vm_area_struct *get_gate_vma(struct task_struct *tsk) |
1122 | { | |
1123 | #ifdef CONFIG_IA32_EMULATION | |
1e014410 AK |
1124 | if (test_tsk_thread_flag(tsk, TIF_IA32)) |
1125 | return NULL; | |
1da177e4 LT |
1126 | #endif |
1127 | return &gate_vma; | |
1128 | } | |
1129 | ||
1130 | int in_gate_area(struct task_struct *task, unsigned long addr) | |
1131 | { | |
1132 | struct vm_area_struct *vma = get_gate_vma(task); | |
14a62c34 | 1133 | |
1e014410 AK |
1134 | if (!vma) |
1135 | return 0; | |
14a62c34 | 1136 | |
1da177e4 LT |
1137 | return (addr >= vma->vm_start) && (addr < vma->vm_end); |
1138 | } | |
1139 | ||
14a62c34 TG |
1140 | /* |
1141 | * Use this when you have no reliable task/vma, typically from interrupt | |
1142 | * context. It is less reliable than using the task's vma and may give | |
1143 | * false positives: | |
1da177e4 LT |
1144 | */ |
1145 | int in_gate_area_no_task(unsigned long addr) | |
1146 | { | |
1e014410 | 1147 | return (addr >= VSYSCALL_START) && (addr < VSYSCALL_END); |
1da177e4 | 1148 | } |
2e1c49db | 1149 | |
2aae950b AK |
1150 | const char *arch_vma_name(struct vm_area_struct *vma) |
1151 | { | |
1152 | if (vma->vm_mm && vma->vm_start == (long)vma->vm_mm->context.vdso) | |
1153 | return "[vdso]"; | |
1154 | if (vma == &gate_vma) | |
1155 | return "[vsyscall]"; | |
1156 | return NULL; | |
1157 | } | |
0889eba5 CL |
1158 | |
1159 | #ifdef CONFIG_SPARSEMEM_VMEMMAP | |
1160 | /* | |
1161 | * Initialise the sparsemem vmemmap using huge-pages at the PMD level. | |
1162 | */ | |
c2b91e2e YL |
1163 | static long __meminitdata addr_start, addr_end; |
1164 | static void __meminitdata *p_start, *p_end; | |
1165 | static int __meminitdata node_start; | |
1166 | ||
14a62c34 TG |
1167 | int __meminit |
1168 | vmemmap_populate(struct page *start_page, unsigned long size, int node) | |
0889eba5 CL |
1169 | { |
1170 | unsigned long addr = (unsigned long)start_page; | |
1171 | unsigned long end = (unsigned long)(start_page + size); | |
1172 | unsigned long next; | |
1173 | pgd_t *pgd; | |
1174 | pud_t *pud; | |
1175 | pmd_t *pmd; | |
1176 | ||
1177 | for (; addr < end; addr = next) { | |
7c934d39 | 1178 | void *p = NULL; |
0889eba5 CL |
1179 | |
1180 | pgd = vmemmap_pgd_populate(addr, node); | |
1181 | if (!pgd) | |
1182 | return -ENOMEM; | |
14a62c34 | 1183 | |
0889eba5 CL |
1184 | pud = vmemmap_pud_populate(pgd, addr, node); |
1185 | if (!pud) | |
1186 | return -ENOMEM; | |
1187 | ||
7c934d39 JF |
1188 | if (!cpu_has_pse) { |
1189 | next = (addr + PAGE_SIZE) & PAGE_MASK; | |
1190 | pmd = vmemmap_pmd_populate(pud, addr, node); | |
1191 | ||
1192 | if (!pmd) | |
1193 | return -ENOMEM; | |
1194 | ||
1195 | p = vmemmap_pte_populate(pmd, addr, node); | |
14a62c34 | 1196 | |
0889eba5 CL |
1197 | if (!p) |
1198 | return -ENOMEM; | |
1199 | ||
7c934d39 JF |
1200 | addr_end = addr + PAGE_SIZE; |
1201 | p_end = p + PAGE_SIZE; | |
14a62c34 | 1202 | } else { |
7c934d39 JF |
1203 | next = pmd_addr_end(addr, end); |
1204 | ||
1205 | pmd = pmd_offset(pud, addr); | |
1206 | if (pmd_none(*pmd)) { | |
1207 | pte_t entry; | |
1208 | ||
1209 | p = vmemmap_alloc_block(PMD_SIZE, node); | |
1210 | if (!p) | |
1211 | return -ENOMEM; | |
1212 | ||
1213 | entry = pfn_pte(__pa(p) >> PAGE_SHIFT, | |
1214 | PAGE_KERNEL_LARGE); | |
1215 | set_pmd(pmd, __pmd(pte_val(entry))); | |
1216 | ||
7c934d39 JF |
1217 | /* check to see if we have contiguous blocks */ |
1218 | if (p_end != p || node_start != node) { | |
1219 | if (p_start) | |
1220 | printk(KERN_DEBUG " [%lx-%lx] PMD -> [%p-%p] on node %d\n", | |
1221 | addr_start, addr_end-1, p_start, p_end-1, node_start); | |
1222 | addr_start = addr; | |
1223 | node_start = node; | |
1224 | p_start = p; | |
1225 | } | |
49c980df YL |
1226 | |
1227 | addr_end = addr + PMD_SIZE; | |
1228 | p_end = p + PMD_SIZE; | |
7c934d39 JF |
1229 | } else |
1230 | vmemmap_verify((pte_t *)pmd, node, addr, next); | |
14a62c34 | 1231 | } |
7c934d39 | 1232 | |
0889eba5 | 1233 | } |
0889eba5 CL |
1234 | return 0; |
1235 | } | |
c2b91e2e YL |
1236 | |
1237 | void __meminit vmemmap_populate_print_last(void) | |
1238 | { | |
1239 | if (p_start) { | |
1240 | printk(KERN_DEBUG " [%lx-%lx] PMD -> [%p-%p] on node %d\n", | |
1241 | addr_start, addr_end-1, p_start, p_end-1, node_start); | |
1242 | p_start = NULL; | |
1243 | p_end = NULL; | |
1244 | node_start = 0; | |
1245 | } | |
1246 | } | |
0889eba5 | 1247 | #endif |