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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 | ||
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 | ||
00d1c5e0 IM |
64 | static int __init parse_direct_gbpages_off(char *arg) |
65 | { | |
66 | direct_gbpages = 0; | |
67 | return 0; | |
68 | } | |
69 | early_param("nogbpages", parse_direct_gbpages_off); | |
70 | ||
71 | static int __init parse_direct_gbpages_on(char *arg) | |
72 | { | |
73 | direct_gbpages = 1; | |
74 | return 0; | |
75 | } | |
76 | early_param("gbpages", parse_direct_gbpages_on); | |
77 | ||
1da177e4 LT |
78 | /* |
79 | * NOTE: pagetable_init alloc all the fixmap pagetables contiguous on the | |
80 | * physical space so we can cache the place of the first one and move | |
81 | * around without checking the pgd every time. | |
82 | */ | |
83 | ||
be43d728 | 84 | pteval_t __supported_pte_mask __read_mostly = ~_PAGE_IOMAP; |
bd220a24 YL |
85 | EXPORT_SYMBOL_GPL(__supported_pte_mask); |
86 | ||
87 | static int do_not_nx __cpuinitdata; | |
88 | ||
deed05b7 IM |
89 | /* |
90 | * noexec=on|off | |
91 | * Control non-executable mappings for 64-bit processes. | |
92 | * | |
93 | * on Enable (default) | |
94 | * off Disable | |
95 | */ | |
bd220a24 YL |
96 | static int __init nonx_setup(char *str) |
97 | { | |
98 | if (!str) | |
99 | return -EINVAL; | |
100 | if (!strncmp(str, "on", 2)) { | |
101 | __supported_pte_mask |= _PAGE_NX; | |
102 | do_not_nx = 0; | |
103 | } else if (!strncmp(str, "off", 3)) { | |
104 | do_not_nx = 1; | |
105 | __supported_pte_mask &= ~_PAGE_NX; | |
106 | } | |
107 | return 0; | |
108 | } | |
109 | early_param("noexec", nonx_setup); | |
110 | ||
111 | void __cpuinit check_efer(void) | |
112 | { | |
113 | unsigned long efer; | |
114 | ||
115 | rdmsrl(MSR_EFER, efer); | |
116 | if (!(efer & EFER_NX) || do_not_nx) | |
117 | __supported_pte_mask &= ~_PAGE_NX; | |
118 | } | |
119 | ||
120 | int force_personality32; | |
121 | ||
deed05b7 IM |
122 | /* |
123 | * noexec32=on|off | |
124 | * Control non executable heap for 32bit processes. | |
125 | * To control the stack too use noexec=off | |
126 | * | |
127 | * on PROT_READ does not imply PROT_EXEC for 32-bit processes (default) | |
128 | * off PROT_READ implies PROT_EXEC | |
129 | */ | |
bd220a24 YL |
130 | static int __init nonx32_setup(char *str) |
131 | { | |
132 | if (!strcmp(str, "on")) | |
133 | force_personality32 &= ~READ_IMPLIES_EXEC; | |
134 | else if (!strcmp(str, "off")) | |
135 | force_personality32 |= READ_IMPLIES_EXEC; | |
136 | return 1; | |
137 | } | |
138 | __setup("noexec32=", nonx32_setup); | |
139 | ||
8d6ea967 MS |
140 | /* |
141 | * NOTE: This function is marked __ref because it calls __init function | |
142 | * (alloc_bootmem_pages). It's safe to do it ONLY when after_bootmem == 0. | |
143 | */ | |
144 | static __ref void *spp_getpage(void) | |
14a62c34 | 145 | { |
1da177e4 | 146 | void *ptr; |
14a62c34 | 147 | |
1da177e4 | 148 | if (after_bootmem) |
14a62c34 | 149 | ptr = (void *) get_zeroed_page(GFP_ATOMIC); |
1da177e4 LT |
150 | else |
151 | ptr = alloc_bootmem_pages(PAGE_SIZE); | |
14a62c34 TG |
152 | |
153 | if (!ptr || ((unsigned long)ptr & ~PAGE_MASK)) { | |
154 | panic("set_pte_phys: cannot allocate page data %s\n", | |
155 | after_bootmem ? "after bootmem" : ""); | |
156 | } | |
1da177e4 | 157 | |
10f22dde | 158 | pr_debug("spp_getpage %p\n", ptr); |
14a62c34 | 159 | |
1da177e4 | 160 | return ptr; |
14a62c34 | 161 | } |
1da177e4 | 162 | |
d494a961 | 163 | void |
0814e0ba | 164 | set_pte_vaddr_pud(pud_t *pud_page, unsigned long vaddr, pte_t new_pte) |
1da177e4 | 165 | { |
1da177e4 LT |
166 | pud_t *pud; |
167 | pmd_t *pmd; | |
d494a961 | 168 | pte_t *pte; |
1da177e4 | 169 | |
0814e0ba | 170 | pud = pud_page + pud_index(vaddr); |
1da177e4 | 171 | if (pud_none(*pud)) { |
14a62c34 | 172 | pmd = (pmd_t *) spp_getpage(); |
bb23e403 | 173 | pud_populate(&init_mm, pud, pmd); |
1da177e4 | 174 | if (pmd != pmd_offset(pud, 0)) { |
10f22dde | 175 | printk(KERN_ERR "PAGETABLE BUG #01! %p <-> %p\n", |
14a62c34 | 176 | pmd, pmd_offset(pud, 0)); |
1da177e4 LT |
177 | return; |
178 | } | |
179 | } | |
180 | pmd = pmd_offset(pud, vaddr); | |
181 | if (pmd_none(*pmd)) { | |
182 | pte = (pte_t *) spp_getpage(); | |
bb23e403 | 183 | pmd_populate_kernel(&init_mm, pmd, pte); |
1da177e4 | 184 | if (pte != pte_offset_kernel(pmd, 0)) { |
10f22dde | 185 | printk(KERN_ERR "PAGETABLE BUG #02!\n"); |
1da177e4 LT |
186 | return; |
187 | } | |
188 | } | |
1da177e4 LT |
189 | |
190 | pte = pte_offset_kernel(pmd, vaddr); | |
1da177e4 LT |
191 | set_pte(pte, new_pte); |
192 | ||
193 | /* | |
194 | * It's enough to flush this one mapping. | |
195 | * (PGE mappings get flushed as well) | |
196 | */ | |
197 | __flush_tlb_one(vaddr); | |
198 | } | |
199 | ||
0814e0ba EH |
200 | void |
201 | set_pte_vaddr(unsigned long vaddr, pte_t pteval) | |
202 | { | |
203 | pgd_t *pgd; | |
204 | pud_t *pud_page; | |
205 | ||
206 | pr_debug("set_pte_vaddr %lx to %lx\n", vaddr, native_pte_val(pteval)); | |
207 | ||
208 | pgd = pgd_offset_k(vaddr); | |
209 | if (pgd_none(*pgd)) { | |
210 | printk(KERN_ERR | |
211 | "PGD FIXMAP MISSING, it should be setup in head.S!\n"); | |
212 | return; | |
213 | } | |
214 | pud_page = (pud_t*)pgd_page_vaddr(*pgd); | |
215 | set_pte_vaddr_pud(pud_page, vaddr, pteval); | |
216 | } | |
217 | ||
3a9e189d JS |
218 | /* |
219 | * Create large page table mappings for a range of physical addresses. | |
220 | */ | |
221 | static void __init __init_extra_mapping(unsigned long phys, unsigned long size, | |
222 | pgprot_t prot) | |
223 | { | |
224 | pgd_t *pgd; | |
225 | pud_t *pud; | |
226 | pmd_t *pmd; | |
227 | ||
228 | BUG_ON((phys & ~PMD_MASK) || (size & ~PMD_MASK)); | |
229 | for (; size; phys += PMD_SIZE, size -= PMD_SIZE) { | |
230 | pgd = pgd_offset_k((unsigned long)__va(phys)); | |
231 | if (pgd_none(*pgd)) { | |
232 | pud = (pud_t *) spp_getpage(); | |
233 | set_pgd(pgd, __pgd(__pa(pud) | _KERNPG_TABLE | | |
234 | _PAGE_USER)); | |
235 | } | |
236 | pud = pud_offset(pgd, (unsigned long)__va(phys)); | |
237 | if (pud_none(*pud)) { | |
238 | pmd = (pmd_t *) spp_getpage(); | |
239 | set_pud(pud, __pud(__pa(pmd) | _KERNPG_TABLE | | |
240 | _PAGE_USER)); | |
241 | } | |
242 | pmd = pmd_offset(pud, phys); | |
243 | BUG_ON(!pmd_none(*pmd)); | |
244 | set_pmd(pmd, __pmd(phys | pgprot_val(prot))); | |
245 | } | |
246 | } | |
247 | ||
248 | void __init init_extra_mapping_wb(unsigned long phys, unsigned long size) | |
249 | { | |
250 | __init_extra_mapping(phys, size, PAGE_KERNEL_LARGE); | |
251 | } | |
252 | ||
253 | void __init init_extra_mapping_uc(unsigned long phys, unsigned long size) | |
254 | { | |
255 | __init_extra_mapping(phys, size, PAGE_KERNEL_LARGE_NOCACHE); | |
256 | } | |
257 | ||
31eedd82 | 258 | /* |
88f3aec7 IM |
259 | * The head.S code sets up the kernel high mapping: |
260 | * | |
261 | * from __START_KERNEL_map to __START_KERNEL_map + size (== _end-_text) | |
31eedd82 TG |
262 | * |
263 | * phys_addr holds the negative offset to the kernel, which is added | |
264 | * to the compile time generated pmds. This results in invalid pmds up | |
265 | * to the point where we hit the physaddr 0 mapping. | |
266 | * | |
267 | * We limit the mappings to the region from _text to _end. _end is | |
268 | * rounded up to the 2MB boundary. This catches the invalid pmds as | |
269 | * well, as they are located before _text: | |
270 | */ | |
271 | void __init cleanup_highmap(void) | |
272 | { | |
273 | unsigned long vaddr = __START_KERNEL_map; | |
d86bb0da | 274 | unsigned long end = roundup((unsigned long)_end, PMD_SIZE) - 1; |
31eedd82 TG |
275 | pmd_t *pmd = level2_kernel_pgt; |
276 | pmd_t *last_pmd = pmd + PTRS_PER_PMD; | |
277 | ||
278 | for (; pmd < last_pmd; pmd++, vaddr += PMD_SIZE) { | |
2884f110 | 279 | if (pmd_none(*pmd)) |
31eedd82 TG |
280 | continue; |
281 | if (vaddr < (unsigned long) _text || vaddr > end) | |
282 | set_pmd(pmd, __pmd(0)); | |
283 | } | |
284 | } | |
285 | ||
f765090a PE |
286 | extern unsigned long __initdata table_start; |
287 | extern unsigned long __meminitdata table_end; | |
288 | extern unsigned long __meminitdata table_top; | |
1da177e4 | 289 | |
9482ac6e | 290 | static __ref void *alloc_low_page(unsigned long *phys) |
14a62c34 | 291 | { |
dafe41ee | 292 | unsigned long pfn = table_end++; |
1da177e4 LT |
293 | void *adr; |
294 | ||
44df75e6 MT |
295 | if (after_bootmem) { |
296 | adr = (void *)get_zeroed_page(GFP_ATOMIC); | |
297 | *phys = __pa(adr); | |
14a62c34 | 298 | |
44df75e6 MT |
299 | return adr; |
300 | } | |
301 | ||
d86623a0 | 302 | if (pfn >= table_top) |
14a62c34 | 303 | panic("alloc_low_page: ran out of memory"); |
dafe41ee | 304 | |
14941779 | 305 | adr = early_memremap(pfn * PAGE_SIZE, PAGE_SIZE); |
44df75e6 | 306 | memset(adr, 0, PAGE_SIZE); |
dafe41ee VG |
307 | *phys = pfn * PAGE_SIZE; |
308 | return adr; | |
309 | } | |
1da177e4 | 310 | |
9482ac6e | 311 | static __ref void unmap_low_page(void *adr) |
14a62c34 | 312 | { |
44df75e6 MT |
313 | if (after_bootmem) |
314 | return; | |
315 | ||
dafe41ee | 316 | early_iounmap(adr, PAGE_SIZE); |
14a62c34 | 317 | } |
1da177e4 | 318 | |
7b16eb89 | 319 | static unsigned long __meminit |
b27a43c1 SS |
320 | phys_pte_init(pte_t *pte_page, unsigned long addr, unsigned long end, |
321 | pgprot_t prot) | |
4f9c11dd JF |
322 | { |
323 | unsigned pages = 0; | |
7b16eb89 | 324 | unsigned long last_map_addr = end; |
4f9c11dd | 325 | int i; |
7b16eb89 | 326 | |
4f9c11dd JF |
327 | pte_t *pte = pte_page + pte_index(addr); |
328 | ||
329 | for(i = pte_index(addr); i < PTRS_PER_PTE; i++, addr += PAGE_SIZE, pte++) { | |
330 | ||
331 | if (addr >= end) { | |
332 | if (!after_bootmem) { | |
333 | for(; i < PTRS_PER_PTE; i++, pte++) | |
334 | set_pte(pte, __pte(0)); | |
335 | } | |
336 | break; | |
337 | } | |
338 | ||
b27a43c1 SS |
339 | /* |
340 | * We will re-use the existing mapping. | |
341 | * Xen for example has some special requirements, like mapping | |
342 | * pagetable pages as RO. So assume someone who pre-setup | |
343 | * these mappings are more intelligent. | |
344 | */ | |
3afa3949 YL |
345 | if (pte_val(*pte)) { |
346 | pages++; | |
4f9c11dd | 347 | continue; |
3afa3949 | 348 | } |
4f9c11dd JF |
349 | |
350 | if (0) | |
351 | printk(" pte=%p addr=%lx pte=%016lx\n", | |
352 | pte, addr, pfn_pte(addr >> PAGE_SHIFT, PAGE_KERNEL).pte); | |
4f9c11dd | 353 | pages++; |
b27a43c1 | 354 | set_pte(pte, pfn_pte(addr >> PAGE_SHIFT, prot)); |
7b16eb89 | 355 | last_map_addr = (addr & PAGE_MASK) + PAGE_SIZE; |
4f9c11dd | 356 | } |
a2699e47 | 357 | |
4f9c11dd | 358 | update_page_count(PG_LEVEL_4K, pages); |
7b16eb89 YL |
359 | |
360 | return last_map_addr; | |
4f9c11dd JF |
361 | } |
362 | ||
7b16eb89 | 363 | static unsigned long __meminit |
b27a43c1 SS |
364 | phys_pte_update(pmd_t *pmd, unsigned long address, unsigned long end, |
365 | pgprot_t prot) | |
4f9c11dd JF |
366 | { |
367 | pte_t *pte = (pte_t *)pmd_page_vaddr(*pmd); | |
368 | ||
b27a43c1 | 369 | return phys_pte_init(pte, address, end, prot); |
4f9c11dd JF |
370 | } |
371 | ||
cc615032 | 372 | static unsigned long __meminit |
b50efd2a | 373 | phys_pmd_init(pmd_t *pmd_page, unsigned long address, unsigned long end, |
b27a43c1 | 374 | unsigned long page_size_mask, pgprot_t prot) |
44df75e6 | 375 | { |
ce0c0e50 | 376 | unsigned long pages = 0; |
7b16eb89 | 377 | unsigned long last_map_addr = end; |
ce0c0e50 | 378 | |
6ad91658 | 379 | int i = pmd_index(address); |
44df75e6 | 380 | |
6ad91658 | 381 | for (; i < PTRS_PER_PMD; i++, address += PMD_SIZE) { |
4f9c11dd | 382 | unsigned long pte_phys; |
6ad91658 | 383 | pmd_t *pmd = pmd_page + pmd_index(address); |
4f9c11dd | 384 | pte_t *pte; |
b27a43c1 | 385 | pgprot_t new_prot = prot; |
44df75e6 | 386 | |
5f51e139 | 387 | if (address >= end) { |
14a62c34 | 388 | if (!after_bootmem) { |
5f51e139 JB |
389 | for (; i < PTRS_PER_PMD; i++, pmd++) |
390 | set_pmd(pmd, __pmd(0)); | |
14a62c34 | 391 | } |
44df75e6 MT |
392 | break; |
393 | } | |
6ad91658 | 394 | |
4f9c11dd | 395 | if (pmd_val(*pmd)) { |
8ae3a5a8 JB |
396 | if (!pmd_large(*pmd)) { |
397 | spin_lock(&init_mm.page_table_lock); | |
7b16eb89 | 398 | last_map_addr = phys_pte_update(pmd, address, |
b27a43c1 | 399 | end, prot); |
8ae3a5a8 | 400 | spin_unlock(&init_mm.page_table_lock); |
a2699e47 | 401 | continue; |
8ae3a5a8 | 402 | } |
b27a43c1 SS |
403 | /* |
404 | * If we are ok with PG_LEVEL_2M mapping, then we will | |
405 | * use the existing mapping, | |
406 | * | |
407 | * Otherwise, we will split the large page mapping but | |
408 | * use the same existing protection bits except for | |
409 | * large page, so that we don't violate Intel's TLB | |
410 | * Application note (317080) which says, while changing | |
411 | * the page sizes, new and old translations should | |
412 | * not differ with respect to page frame and | |
413 | * attributes. | |
414 | */ | |
3afa3949 YL |
415 | if (page_size_mask & (1 << PG_LEVEL_2M)) { |
416 | pages++; | |
b27a43c1 | 417 | continue; |
3afa3949 | 418 | } |
b27a43c1 | 419 | new_prot = pte_pgprot(pte_clrhuge(*(pte_t *)pmd)); |
4f9c11dd JF |
420 | } |
421 | ||
b50efd2a | 422 | if (page_size_mask & (1<<PG_LEVEL_2M)) { |
4f9c11dd | 423 | pages++; |
8ae3a5a8 | 424 | spin_lock(&init_mm.page_table_lock); |
4f9c11dd | 425 | set_pte((pte_t *)pmd, |
b27a43c1 SS |
426 | pfn_pte(address >> PAGE_SHIFT, |
427 | __pgprot(pgprot_val(prot) | _PAGE_PSE))); | |
8ae3a5a8 | 428 | spin_unlock(&init_mm.page_table_lock); |
7b16eb89 | 429 | last_map_addr = (address & PMD_MASK) + PMD_SIZE; |
6ad91658 | 430 | continue; |
4f9c11dd | 431 | } |
6ad91658 | 432 | |
4f9c11dd | 433 | pte = alloc_low_page(&pte_phys); |
b27a43c1 | 434 | last_map_addr = phys_pte_init(pte, address, end, new_prot); |
4f9c11dd JF |
435 | unmap_low_page(pte); |
436 | ||
8ae3a5a8 | 437 | spin_lock(&init_mm.page_table_lock); |
4f9c11dd | 438 | pmd_populate_kernel(&init_mm, pmd, __va(pte_phys)); |
8ae3a5a8 | 439 | spin_unlock(&init_mm.page_table_lock); |
44df75e6 | 440 | } |
ce0c0e50 | 441 | update_page_count(PG_LEVEL_2M, pages); |
7b16eb89 | 442 | return last_map_addr; |
44df75e6 MT |
443 | } |
444 | ||
cc615032 | 445 | static unsigned long __meminit |
b50efd2a | 446 | phys_pmd_update(pud_t *pud, unsigned long address, unsigned long end, |
b27a43c1 | 447 | unsigned long page_size_mask, pgprot_t prot) |
44df75e6 | 448 | { |
14a62c34 | 449 | pmd_t *pmd = pmd_offset(pud, 0); |
cc615032 AK |
450 | unsigned long last_map_addr; |
451 | ||
b27a43c1 | 452 | last_map_addr = phys_pmd_init(pmd, address, end, page_size_mask, prot); |
6ad91658 | 453 | __flush_tlb_all(); |
cc615032 | 454 | return last_map_addr; |
44df75e6 MT |
455 | } |
456 | ||
cc615032 | 457 | static unsigned long __meminit |
b50efd2a YL |
458 | phys_pud_init(pud_t *pud_page, unsigned long addr, unsigned long end, |
459 | unsigned long page_size_mask) | |
14a62c34 | 460 | { |
ce0c0e50 | 461 | unsigned long pages = 0; |
cc615032 | 462 | unsigned long last_map_addr = end; |
6ad91658 | 463 | int i = pud_index(addr); |
44df75e6 | 464 | |
14a62c34 | 465 | for (; i < PTRS_PER_PUD; i++, addr = (addr & PUD_MASK) + PUD_SIZE) { |
6ad91658 KM |
466 | unsigned long pmd_phys; |
467 | pud_t *pud = pud_page + pud_index(addr); | |
1da177e4 | 468 | pmd_t *pmd; |
b27a43c1 | 469 | pgprot_t prot = PAGE_KERNEL; |
1da177e4 | 470 | |
6ad91658 | 471 | if (addr >= end) |
1da177e4 | 472 | break; |
1da177e4 | 473 | |
14a62c34 TG |
474 | if (!after_bootmem && |
475 | !e820_any_mapped(addr, addr+PUD_SIZE, 0)) { | |
476 | set_pud(pud, __pud(0)); | |
1da177e4 | 477 | continue; |
14a62c34 | 478 | } |
1da177e4 | 479 | |
6ad91658 | 480 | if (pud_val(*pud)) { |
a2699e47 | 481 | if (!pud_large(*pud)) { |
b50efd2a | 482 | last_map_addr = phys_pmd_update(pud, addr, end, |
b27a43c1 | 483 | page_size_mask, prot); |
a2699e47 SS |
484 | continue; |
485 | } | |
b27a43c1 SS |
486 | /* |
487 | * If we are ok with PG_LEVEL_1G mapping, then we will | |
488 | * use the existing mapping. | |
489 | * | |
490 | * Otherwise, we will split the gbpage mapping but use | |
491 | * the same existing protection bits except for large | |
492 | * page, so that we don't violate Intel's TLB | |
493 | * Application note (317080) which says, while changing | |
494 | * the page sizes, new and old translations should | |
495 | * not differ with respect to page frame and | |
496 | * attributes. | |
497 | */ | |
3afa3949 YL |
498 | if (page_size_mask & (1 << PG_LEVEL_1G)) { |
499 | pages++; | |
b27a43c1 | 500 | continue; |
3afa3949 | 501 | } |
b27a43c1 | 502 | prot = pte_pgprot(pte_clrhuge(*(pte_t *)pud)); |
ef925766 AK |
503 | } |
504 | ||
b50efd2a | 505 | if (page_size_mask & (1<<PG_LEVEL_1G)) { |
ce0c0e50 | 506 | pages++; |
8ae3a5a8 | 507 | spin_lock(&init_mm.page_table_lock); |
ef925766 AK |
508 | set_pte((pte_t *)pud, |
509 | pfn_pte(addr >> PAGE_SHIFT, PAGE_KERNEL_LARGE)); | |
8ae3a5a8 | 510 | spin_unlock(&init_mm.page_table_lock); |
cc615032 | 511 | last_map_addr = (addr & PUD_MASK) + PUD_SIZE; |
6ad91658 KM |
512 | continue; |
513 | } | |
514 | ||
dafe41ee | 515 | pmd = alloc_low_page(&pmd_phys); |
b27a43c1 SS |
516 | last_map_addr = phys_pmd_init(pmd, addr, end, page_size_mask, |
517 | prot); | |
4f9c11dd | 518 | unmap_low_page(pmd); |
8ae3a5a8 JB |
519 | |
520 | spin_lock(&init_mm.page_table_lock); | |
4f9c11dd | 521 | pud_populate(&init_mm, pud, __va(pmd_phys)); |
44df75e6 | 522 | spin_unlock(&init_mm.page_table_lock); |
1da177e4 | 523 | } |
1a2b4412 | 524 | __flush_tlb_all(); |
a2699e47 | 525 | |
ce0c0e50 | 526 | update_page_count(PG_LEVEL_1G, pages); |
cc615032 | 527 | |
1a0db38e | 528 | return last_map_addr; |
14a62c34 | 529 | } |
1da177e4 | 530 | |
4f9c11dd | 531 | static unsigned long __meminit |
b50efd2a YL |
532 | phys_pud_update(pgd_t *pgd, unsigned long addr, unsigned long end, |
533 | unsigned long page_size_mask) | |
4f9c11dd JF |
534 | { |
535 | pud_t *pud; | |
536 | ||
537 | pud = (pud_t *)pgd_page_vaddr(*pgd); | |
538 | ||
b50efd2a | 539 | return phys_pud_init(pud, addr, end, page_size_mask); |
4f9c11dd JF |
540 | } |
541 | ||
f765090a PE |
542 | unsigned long __meminit |
543 | kernel_physical_mapping_init(unsigned long start, | |
544 | unsigned long end, | |
545 | unsigned long page_size_mask) | |
14a62c34 | 546 | { |
1da177e4 | 547 | |
b50efd2a | 548 | unsigned long next, last_map_addr = end; |
1da177e4 LT |
549 | |
550 | start = (unsigned long)__va(start); | |
551 | end = (unsigned long)__va(end); | |
552 | ||
553 | for (; start < end; start = next) { | |
44df75e6 | 554 | pgd_t *pgd = pgd_offset_k(start); |
14a62c34 | 555 | unsigned long pud_phys; |
44df75e6 MT |
556 | pud_t *pud; |
557 | ||
e22146e6 | 558 | next = (start + PGDIR_SIZE) & PGDIR_MASK; |
4f9c11dd JF |
559 | if (next > end) |
560 | next = end; | |
561 | ||
562 | if (pgd_val(*pgd)) { | |
b50efd2a YL |
563 | last_map_addr = phys_pud_update(pgd, __pa(start), |
564 | __pa(end), page_size_mask); | |
4f9c11dd JF |
565 | continue; |
566 | } | |
567 | ||
8ae3a5a8 | 568 | pud = alloc_low_page(&pud_phys); |
b50efd2a YL |
569 | last_map_addr = phys_pud_init(pud, __pa(start), __pa(next), |
570 | page_size_mask); | |
4f9c11dd | 571 | unmap_low_page(pud); |
8ae3a5a8 JB |
572 | |
573 | spin_lock(&init_mm.page_table_lock); | |
574 | pgd_populate(&init_mm, pgd, __va(pud_phys)); | |
575 | spin_unlock(&init_mm.page_table_lock); | |
14a62c34 | 576 | } |
a2699e47 | 577 | __flush_tlb_all(); |
1da177e4 | 578 | |
b50efd2a YL |
579 | return last_map_addr; |
580 | } | |
7b16eb89 | 581 | |
2b97690f | 582 | #ifndef CONFIG_NUMA |
1f75d7e3 YL |
583 | void __init initmem_init(unsigned long start_pfn, unsigned long end_pfn) |
584 | { | |
585 | unsigned long bootmap_size, bootmap; | |
586 | ||
587 | bootmap_size = bootmem_bootmap_pages(end_pfn)<<PAGE_SHIFT; | |
588 | bootmap = find_e820_area(0, end_pfn<<PAGE_SHIFT, bootmap_size, | |
589 | PAGE_SIZE); | |
590 | if (bootmap == -1L) | |
591 | panic("Cannot find bootmem map of size %ld\n", bootmap_size); | |
346cafec YL |
592 | /* don't touch min_low_pfn */ |
593 | bootmap_size = init_bootmem_node(NODE_DATA(0), bootmap >> PAGE_SHIFT, | |
594 | 0, end_pfn); | |
1f75d7e3 YL |
595 | e820_register_active_regions(0, start_pfn, end_pfn); |
596 | free_bootmem_with_active_regions(0, end_pfn); | |
597 | early_res_to_bootmem(0, end_pfn<<PAGE_SHIFT); | |
598 | reserve_bootmem(bootmap, bootmap_size, BOOTMEM_DEFAULT); | |
599 | } | |
600 | ||
1da177e4 LT |
601 | void __init paging_init(void) |
602 | { | |
6391af17 | 603 | unsigned long max_zone_pfns[MAX_NR_ZONES]; |
14a62c34 | 604 | |
6391af17 MG |
605 | memset(max_zone_pfns, 0, sizeof(max_zone_pfns)); |
606 | max_zone_pfns[ZONE_DMA] = MAX_DMA_PFN; | |
607 | max_zone_pfns[ZONE_DMA32] = MAX_DMA32_PFN; | |
c987d12f | 608 | max_zone_pfns[ZONE_NORMAL] = max_pfn; |
6391af17 | 609 | |
c987d12f | 610 | memory_present(0, 0, max_pfn); |
44df75e6 | 611 | sparse_init(); |
5cb248ab | 612 | free_area_init_nodes(max_zone_pfns); |
1da177e4 LT |
613 | } |
614 | #endif | |
615 | ||
44df75e6 MT |
616 | /* |
617 | * Memory hotplug specific functions | |
44df75e6 | 618 | */ |
bc02af93 | 619 | #ifdef CONFIG_MEMORY_HOTPLUG |
9d99aaa3 AK |
620 | /* |
621 | * Memory is added always to NORMAL zone. This means you will never get | |
622 | * additional DMA/DMA32 memory. | |
623 | */ | |
bc02af93 | 624 | int arch_add_memory(int nid, u64 start, u64 size) |
44df75e6 | 625 | { |
bc02af93 | 626 | struct pglist_data *pgdat = NODE_DATA(nid); |
776ed98b | 627 | struct zone *zone = pgdat->node_zones + ZONE_NORMAL; |
cc615032 | 628 | unsigned long last_mapped_pfn, start_pfn = start >> PAGE_SHIFT; |
44df75e6 MT |
629 | unsigned long nr_pages = size >> PAGE_SHIFT; |
630 | int ret; | |
631 | ||
60817c9b | 632 | last_mapped_pfn = init_memory_mapping(start, start + size); |
cc615032 AK |
633 | if (last_mapped_pfn > max_pfn_mapped) |
634 | max_pfn_mapped = last_mapped_pfn; | |
45e0b78b | 635 | |
c04fc586 | 636 | ret = __add_pages(nid, zone, start_pfn, nr_pages); |
fe8b868e | 637 | WARN_ON_ONCE(ret); |
44df75e6 | 638 | |
44df75e6 | 639 | return ret; |
44df75e6 | 640 | } |
bc02af93 | 641 | EXPORT_SYMBOL_GPL(arch_add_memory); |
44df75e6 | 642 | |
8243229f | 643 | #if !defined(CONFIG_ACPI_NUMA) && defined(CONFIG_NUMA) |
4942e998 KM |
644 | int memory_add_physaddr_to_nid(u64 start) |
645 | { | |
646 | return 0; | |
647 | } | |
8c2676a5 | 648 | EXPORT_SYMBOL_GPL(memory_add_physaddr_to_nid); |
4942e998 KM |
649 | #endif |
650 | ||
45e0b78b KM |
651 | #endif /* CONFIG_MEMORY_HOTPLUG */ |
652 | ||
14a62c34 TG |
653 | static struct kcore_list kcore_mem, kcore_vmalloc, kcore_kernel, |
654 | kcore_modules, kcore_vsyscall; | |
1da177e4 LT |
655 | |
656 | void __init mem_init(void) | |
657 | { | |
0a43e4bf | 658 | long codesize, reservedpages, datasize, initsize; |
11a6b0c9 | 659 | unsigned long absent_pages; |
1da177e4 | 660 | |
0dc243ae | 661 | pci_iommu_alloc(); |
1da177e4 | 662 | |
48ddb154 | 663 | /* clear_bss() already clear the empty_zero_page */ |
1da177e4 LT |
664 | |
665 | reservedpages = 0; | |
666 | ||
667 | /* this will put all low memory onto the freelists */ | |
2b97690f | 668 | #ifdef CONFIG_NUMA |
0a43e4bf | 669 | totalram_pages = numa_free_all_bootmem(); |
1da177e4 | 670 | #else |
0a43e4bf | 671 | totalram_pages = free_all_bootmem(); |
1da177e4 | 672 | #endif |
11a6b0c9 YL |
673 | |
674 | absent_pages = absent_pages_in_range(0, max_pfn); | |
675 | reservedpages = max_pfn - totalram_pages - absent_pages; | |
1da177e4 LT |
676 | after_bootmem = 1; |
677 | ||
678 | codesize = (unsigned long) &_etext - (unsigned long) &_text; | |
679 | datasize = (unsigned long) &_edata - (unsigned long) &_etext; | |
680 | initsize = (unsigned long) &__init_end - (unsigned long) &__init_begin; | |
681 | ||
682 | /* Register memory areas for /proc/kcore */ | |
14a62c34 TG |
683 | kclist_add(&kcore_mem, __va(0), max_low_pfn << PAGE_SHIFT); |
684 | kclist_add(&kcore_vmalloc, (void *)VMALLOC_START, | |
1da177e4 LT |
685 | VMALLOC_END-VMALLOC_START); |
686 | kclist_add(&kcore_kernel, &_stext, _end - _stext); | |
687 | kclist_add(&kcore_modules, (void *)MODULES_VADDR, MODULES_LEN); | |
14a62c34 | 688 | kclist_add(&kcore_vsyscall, (void *)VSYSCALL_START, |
1da177e4 LT |
689 | VSYSCALL_END - VSYSCALL_START); |
690 | ||
10f22dde | 691 | printk(KERN_INFO "Memory: %luk/%luk available (%ldk kernel code, " |
11a6b0c9 | 692 | "%ldk absent, %ldk reserved, %ldk data, %ldk init)\n", |
1da177e4 | 693 | (unsigned long) nr_free_pages() << (PAGE_SHIFT-10), |
c987d12f | 694 | max_pfn << (PAGE_SHIFT-10), |
1da177e4 | 695 | codesize >> 10, |
11a6b0c9 | 696 | absent_pages << (PAGE_SHIFT-10), |
1da177e4 LT |
697 | reservedpages << (PAGE_SHIFT-10), |
698 | datasize >> 10, | |
699 | initsize >> 10); | |
1da177e4 LT |
700 | } |
701 | ||
67df197b | 702 | #ifdef CONFIG_DEBUG_RODATA |
edeed305 AV |
703 | const int rodata_test_data = 0xC3; |
704 | EXPORT_SYMBOL_GPL(rodata_test_data); | |
67df197b | 705 | |
67df197b AV |
706 | void mark_rodata_ro(void) |
707 | { | |
4e4eee0e | 708 | unsigned long start = PFN_ALIGN(_stext), end = PFN_ALIGN(__end_rodata); |
8f0f996e SR |
709 | unsigned long rodata_start = |
710 | ((unsigned long)__start_rodata + PAGE_SIZE - 1) & PAGE_MASK; | |
711 | ||
712 | #ifdef CONFIG_DYNAMIC_FTRACE | |
713 | /* Dynamic tracing modifies the kernel text section */ | |
714 | start = rodata_start; | |
715 | #endif | |
67df197b | 716 | |
6fb14755 | 717 | printk(KERN_INFO "Write protecting the kernel read-only data: %luk\n", |
e3ebadd9 | 718 | (end - start) >> 10); |
984bb80d AV |
719 | set_memory_ro(start, (end - start) >> PAGE_SHIFT); |
720 | ||
721 | /* | |
722 | * The rodata section (but not the kernel text!) should also be | |
723 | * not-executable. | |
724 | */ | |
72b59d67 | 725 | set_memory_nx(rodata_start, (end - rodata_start) >> PAGE_SHIFT); |
67df197b | 726 | |
1a487252 AV |
727 | rodata_test(); |
728 | ||
0c42f392 | 729 | #ifdef CONFIG_CPA_DEBUG |
10f22dde | 730 | printk(KERN_INFO "Testing CPA: undo %lx-%lx\n", start, end); |
6d238cc4 | 731 | set_memory_rw(start, (end-start) >> PAGE_SHIFT); |
0c42f392 | 732 | |
10f22dde | 733 | printk(KERN_INFO "Testing CPA: again\n"); |
6d238cc4 | 734 | set_memory_ro(start, (end-start) >> PAGE_SHIFT); |
0c42f392 | 735 | #endif |
67df197b | 736 | } |
4e4eee0e | 737 | |
67df197b AV |
738 | #endif |
739 | ||
d2dbf343 YL |
740 | int __init reserve_bootmem_generic(unsigned long phys, unsigned long len, |
741 | int flags) | |
14a62c34 | 742 | { |
2b97690f | 743 | #ifdef CONFIG_NUMA |
8b3cd09e | 744 | int nid, next_nid; |
6a07a0ed | 745 | int ret; |
5e58a02a AK |
746 | #endif |
747 | unsigned long pfn = phys >> PAGE_SHIFT; | |
14a62c34 | 748 | |
c987d12f | 749 | if (pfn >= max_pfn) { |
14a62c34 TG |
750 | /* |
751 | * This can happen with kdump kernels when accessing | |
752 | * firmware tables: | |
753 | */ | |
67794292 | 754 | if (pfn < max_pfn_mapped) |
8b2ef1d7 | 755 | return -EFAULT; |
14a62c34 | 756 | |
6a07a0ed | 757 | printk(KERN_ERR "reserve_bootmem: illegal reserve %lx %lu\n", |
5e58a02a | 758 | phys, len); |
8b2ef1d7 | 759 | return -EFAULT; |
5e58a02a AK |
760 | } |
761 | ||
762 | /* Should check here against the e820 map to avoid double free */ | |
763 | #ifdef CONFIG_NUMA | |
8b3cd09e YL |
764 | nid = phys_to_nid(phys); |
765 | next_nid = phys_to_nid(phys + len - 1); | |
766 | if (nid == next_nid) | |
8b2ef1d7 | 767 | ret = reserve_bootmem_node(NODE_DATA(nid), phys, len, flags); |
8b3cd09e | 768 | else |
8b2ef1d7 BW |
769 | ret = reserve_bootmem(phys, len, flags); |
770 | ||
771 | if (ret != 0) | |
772 | return ret; | |
773 | ||
14a62c34 | 774 | #else |
72a7fe39 | 775 | reserve_bootmem(phys, len, BOOTMEM_DEFAULT); |
1da177e4 | 776 | #endif |
8b3cd09e | 777 | |
0e0b864e | 778 | if (phys+len <= MAX_DMA_PFN*PAGE_SIZE) { |
e18c6874 | 779 | dma_reserve += len / PAGE_SIZE; |
0e0b864e MG |
780 | set_dma_reserve(dma_reserve); |
781 | } | |
8b2ef1d7 BW |
782 | |
783 | return 0; | |
1da177e4 LT |
784 | } |
785 | ||
14a62c34 TG |
786 | int kern_addr_valid(unsigned long addr) |
787 | { | |
1da177e4 | 788 | unsigned long above = ((long)addr) >> __VIRTUAL_MASK_SHIFT; |
14a62c34 TG |
789 | pgd_t *pgd; |
790 | pud_t *pud; | |
791 | pmd_t *pmd; | |
792 | pte_t *pte; | |
1da177e4 LT |
793 | |
794 | if (above != 0 && above != -1UL) | |
14a62c34 TG |
795 | return 0; |
796 | ||
1da177e4 LT |
797 | pgd = pgd_offset_k(addr); |
798 | if (pgd_none(*pgd)) | |
799 | return 0; | |
800 | ||
801 | pud = pud_offset(pgd, addr); | |
802 | if (pud_none(*pud)) | |
14a62c34 | 803 | return 0; |
1da177e4 LT |
804 | |
805 | pmd = pmd_offset(pud, addr); | |
806 | if (pmd_none(*pmd)) | |
807 | return 0; | |
14a62c34 | 808 | |
1da177e4 LT |
809 | if (pmd_large(*pmd)) |
810 | return pfn_valid(pmd_pfn(*pmd)); | |
811 | ||
812 | pte = pte_offset_kernel(pmd, addr); | |
813 | if (pte_none(*pte)) | |
814 | return 0; | |
14a62c34 | 815 | |
1da177e4 LT |
816 | return pfn_valid(pte_pfn(*pte)); |
817 | } | |
818 | ||
14a62c34 TG |
819 | /* |
820 | * A pseudo VMA to allow ptrace access for the vsyscall page. This only | |
821 | * covers the 64bit vsyscall page now. 32bit has a real VMA now and does | |
822 | * not need special handling anymore: | |
823 | */ | |
1da177e4 | 824 | static struct vm_area_struct gate_vma = { |
14a62c34 TG |
825 | .vm_start = VSYSCALL_START, |
826 | .vm_end = VSYSCALL_START + (VSYSCALL_MAPPED_PAGES * PAGE_SIZE), | |
827 | .vm_page_prot = PAGE_READONLY_EXEC, | |
828 | .vm_flags = VM_READ | VM_EXEC | |
1da177e4 LT |
829 | }; |
830 | ||
1da177e4 LT |
831 | struct vm_area_struct *get_gate_vma(struct task_struct *tsk) |
832 | { | |
833 | #ifdef CONFIG_IA32_EMULATION | |
1e014410 AK |
834 | if (test_tsk_thread_flag(tsk, TIF_IA32)) |
835 | return NULL; | |
1da177e4 LT |
836 | #endif |
837 | return &gate_vma; | |
838 | } | |
839 | ||
840 | int in_gate_area(struct task_struct *task, unsigned long addr) | |
841 | { | |
842 | struct vm_area_struct *vma = get_gate_vma(task); | |
14a62c34 | 843 | |
1e014410 AK |
844 | if (!vma) |
845 | return 0; | |
14a62c34 | 846 | |
1da177e4 LT |
847 | return (addr >= vma->vm_start) && (addr < vma->vm_end); |
848 | } | |
849 | ||
14a62c34 TG |
850 | /* |
851 | * Use this when you have no reliable task/vma, typically from interrupt | |
852 | * context. It is less reliable than using the task's vma and may give | |
853 | * false positives: | |
1da177e4 LT |
854 | */ |
855 | int in_gate_area_no_task(unsigned long addr) | |
856 | { | |
1e014410 | 857 | return (addr >= VSYSCALL_START) && (addr < VSYSCALL_END); |
1da177e4 | 858 | } |
2e1c49db | 859 | |
2aae950b AK |
860 | const char *arch_vma_name(struct vm_area_struct *vma) |
861 | { | |
862 | if (vma->vm_mm && vma->vm_start == (long)vma->vm_mm->context.vdso) | |
863 | return "[vdso]"; | |
864 | if (vma == &gate_vma) | |
865 | return "[vsyscall]"; | |
866 | return NULL; | |
867 | } | |
0889eba5 CL |
868 | |
869 | #ifdef CONFIG_SPARSEMEM_VMEMMAP | |
870 | /* | |
871 | * Initialise the sparsemem vmemmap using huge-pages at the PMD level. | |
872 | */ | |
c2b91e2e YL |
873 | static long __meminitdata addr_start, addr_end; |
874 | static void __meminitdata *p_start, *p_end; | |
875 | static int __meminitdata node_start; | |
876 | ||
14a62c34 TG |
877 | int __meminit |
878 | vmemmap_populate(struct page *start_page, unsigned long size, int node) | |
0889eba5 CL |
879 | { |
880 | unsigned long addr = (unsigned long)start_page; | |
881 | unsigned long end = (unsigned long)(start_page + size); | |
882 | unsigned long next; | |
883 | pgd_t *pgd; | |
884 | pud_t *pud; | |
885 | pmd_t *pmd; | |
886 | ||
887 | for (; addr < end; addr = next) { | |
7c934d39 | 888 | void *p = NULL; |
0889eba5 CL |
889 | |
890 | pgd = vmemmap_pgd_populate(addr, node); | |
891 | if (!pgd) | |
892 | return -ENOMEM; | |
14a62c34 | 893 | |
0889eba5 CL |
894 | pud = vmemmap_pud_populate(pgd, addr, node); |
895 | if (!pud) | |
896 | return -ENOMEM; | |
897 | ||
7c934d39 JF |
898 | if (!cpu_has_pse) { |
899 | next = (addr + PAGE_SIZE) & PAGE_MASK; | |
900 | pmd = vmemmap_pmd_populate(pud, addr, node); | |
901 | ||
902 | if (!pmd) | |
903 | return -ENOMEM; | |
904 | ||
905 | p = vmemmap_pte_populate(pmd, addr, node); | |
14a62c34 | 906 | |
0889eba5 CL |
907 | if (!p) |
908 | return -ENOMEM; | |
909 | ||
7c934d39 JF |
910 | addr_end = addr + PAGE_SIZE; |
911 | p_end = p + PAGE_SIZE; | |
14a62c34 | 912 | } else { |
7c934d39 JF |
913 | next = pmd_addr_end(addr, end); |
914 | ||
915 | pmd = pmd_offset(pud, addr); | |
916 | if (pmd_none(*pmd)) { | |
917 | pte_t entry; | |
918 | ||
919 | p = vmemmap_alloc_block(PMD_SIZE, node); | |
920 | if (!p) | |
921 | return -ENOMEM; | |
922 | ||
923 | entry = pfn_pte(__pa(p) >> PAGE_SHIFT, | |
924 | PAGE_KERNEL_LARGE); | |
925 | set_pmd(pmd, __pmd(pte_val(entry))); | |
926 | ||
7c934d39 JF |
927 | /* check to see if we have contiguous blocks */ |
928 | if (p_end != p || node_start != node) { | |
929 | if (p_start) | |
930 | printk(KERN_DEBUG " [%lx-%lx] PMD -> [%p-%p] on node %d\n", | |
931 | addr_start, addr_end-1, p_start, p_end-1, node_start); | |
932 | addr_start = addr; | |
933 | node_start = node; | |
934 | p_start = p; | |
935 | } | |
49c980df YL |
936 | |
937 | addr_end = addr + PMD_SIZE; | |
938 | p_end = p + PMD_SIZE; | |
7c934d39 JF |
939 | } else |
940 | vmemmap_verify((pte_t *)pmd, node, addr, next); | |
14a62c34 | 941 | } |
7c934d39 | 942 | |
0889eba5 | 943 | } |
0889eba5 CL |
944 | return 0; |
945 | } | |
c2b91e2e YL |
946 | |
947 | void __meminit vmemmap_populate_print_last(void) | |
948 | { | |
949 | if (p_start) { | |
950 | printk(KERN_DEBUG " [%lx-%lx] PMD -> [%p-%p] on node %d\n", | |
951 | addr_start, addr_end-1, p_start, p_end-1, node_start); | |
952 | p_start = NULL; | |
953 | p_end = NULL; | |
954 | node_start = 0; | |
955 | } | |
956 | } | |
0889eba5 | 957 | #endif |