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Commit | Line | Data |
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2c1b284e | 1 | #include <linux/initrd.h> |
540aca06 | 2 | #include <linux/ioport.h> |
e5b2bb55 | 3 | #include <linux/swap.h> |
540aca06 | 4 | |
e5b2bb55 | 5 | #include <asm/cacheflush.h> |
f765090a | 6 | #include <asm/e820.h> |
4fcb2083 | 7 | #include <asm/init.h> |
e5b2bb55 | 8 | #include <asm/page.h> |
540aca06 | 9 | #include <asm/page_types.h> |
e5b2bb55 | 10 | #include <asm/sections.h> |
49834396 | 11 | #include <asm/setup.h> |
e5b2bb55 | 12 | #include <asm/system.h> |
f765090a | 13 | #include <asm/tlbflush.h> |
9518e0e4 PE |
14 | #include <asm/tlb.h> |
15 | ||
16 | DEFINE_PER_CPU(struct mmu_gather, mmu_gathers); | |
f765090a | 17 | |
298af9d8 PE |
18 | unsigned long __initdata e820_table_start; |
19 | unsigned long __meminitdata e820_table_end; | |
20 | unsigned long __meminitdata e820_table_top; | |
f765090a PE |
21 | |
22 | int after_bootmem; | |
23 | ||
24 | int direct_gbpages | |
25 | #ifdef CONFIG_DIRECT_GBPAGES | |
26 | = 1 | |
27 | #endif | |
28 | ; | |
29 | ||
89388913 PE |
30 | int nx_enabled; |
31 | ||
32 | #if defined(CONFIG_X86_64) || defined(CONFIG_X86_PAE) | |
33 | static int disable_nx __cpuinitdata; | |
34 | ||
35 | /* | |
36 | * noexec = on|off | |
37 | * | |
38 | * Control non-executable mappings for processes. | |
39 | * | |
40 | * on Enable | |
41 | * off Disable | |
42 | */ | |
43 | static int __init noexec_setup(char *str) | |
44 | { | |
45 | if (!str) | |
46 | return -EINVAL; | |
47 | if (!strncmp(str, "on", 2)) { | |
48 | __supported_pte_mask |= _PAGE_NX; | |
49 | disable_nx = 0; | |
50 | } else if (!strncmp(str, "off", 3)) { | |
51 | disable_nx = 1; | |
52 | __supported_pte_mask &= ~_PAGE_NX; | |
53 | } | |
54 | return 0; | |
55 | } | |
56 | early_param("noexec", noexec_setup); | |
57 | #endif | |
58 | ||
59 | #ifdef CONFIG_X86_PAE | |
60 | static void __init set_nx(void) | |
61 | { | |
62 | unsigned int v[4], l, h; | |
63 | ||
64 | if (cpu_has_pae && (cpuid_eax(0x80000000) > 0x80000001)) { | |
65 | cpuid(0x80000001, &v[0], &v[1], &v[2], &v[3]); | |
66 | ||
67 | if ((v[3] & (1 << 20)) && !disable_nx) { | |
68 | rdmsr(MSR_EFER, l, h); | |
69 | l |= EFER_NX; | |
70 | wrmsr(MSR_EFER, l, h); | |
71 | nx_enabled = 1; | |
72 | __supported_pte_mask |= _PAGE_NX; | |
73 | } | |
74 | } | |
75 | } | |
76 | #else | |
77 | static inline void set_nx(void) | |
78 | { | |
79 | } | |
80 | #endif | |
81 | ||
82 | #ifdef CONFIG_X86_64 | |
83 | void __cpuinit check_efer(void) | |
84 | { | |
85 | unsigned long efer; | |
86 | ||
87 | rdmsrl(MSR_EFER, efer); | |
88 | if (!(efer & EFER_NX) || disable_nx) | |
89 | __supported_pte_mask &= ~_PAGE_NX; | |
90 | } | |
91 | #endif | |
92 | ||
f765090a PE |
93 | static void __init find_early_table_space(unsigned long end, int use_pse, |
94 | int use_gbpages) | |
95 | { | |
96 | unsigned long puds, pmds, ptes, tables, start; | |
97 | ||
98 | puds = (end + PUD_SIZE - 1) >> PUD_SHIFT; | |
99 | tables = roundup(puds * sizeof(pud_t), PAGE_SIZE); | |
100 | ||
101 | if (use_gbpages) { | |
102 | unsigned long extra; | |
103 | ||
104 | extra = end - ((end>>PUD_SHIFT) << PUD_SHIFT); | |
105 | pmds = (extra + PMD_SIZE - 1) >> PMD_SHIFT; | |
106 | } else | |
107 | pmds = (end + PMD_SIZE - 1) >> PMD_SHIFT; | |
108 | ||
109 | tables += roundup(pmds * sizeof(pmd_t), PAGE_SIZE); | |
110 | ||
111 | if (use_pse) { | |
112 | unsigned long extra; | |
113 | ||
114 | extra = end - ((end>>PMD_SHIFT) << PMD_SHIFT); | |
115 | #ifdef CONFIG_X86_32 | |
116 | extra += PMD_SIZE; | |
117 | #endif | |
118 | ptes = (extra + PAGE_SIZE - 1) >> PAGE_SHIFT; | |
119 | } else | |
120 | ptes = (end + PAGE_SIZE - 1) >> PAGE_SHIFT; | |
121 | ||
122 | tables += roundup(ptes * sizeof(pte_t), PAGE_SIZE); | |
123 | ||
124 | #ifdef CONFIG_X86_32 | |
125 | /* for fixmap */ | |
126 | tables += roundup(__end_of_fixed_addresses * sizeof(pte_t), PAGE_SIZE); | |
127 | #endif | |
128 | ||
129 | /* | |
130 | * RED-PEN putting page tables only on node 0 could | |
131 | * cause a hotspot and fill up ZONE_DMA. The page tables | |
132 | * need roughly 0.5KB per GB. | |
133 | */ | |
134 | #ifdef CONFIG_X86_32 | |
135 | start = 0x7000; | |
80989ce0 | 136 | #else |
f765090a | 137 | start = 0x8000; |
f765090a | 138 | #endif |
80989ce0 YL |
139 | e820_table_start = find_e820_area(start, max_pfn_mapped<<PAGE_SHIFT, |
140 | tables, PAGE_SIZE); | |
298af9d8 | 141 | if (e820_table_start == -1UL) |
f765090a PE |
142 | panic("Cannot find space for the kernel page tables"); |
143 | ||
298af9d8 PE |
144 | e820_table_start >>= PAGE_SHIFT; |
145 | e820_table_end = e820_table_start; | |
146 | e820_table_top = e820_table_start + (tables >> PAGE_SHIFT); | |
f765090a PE |
147 | |
148 | printk(KERN_DEBUG "kernel direct mapping tables up to %lx @ %lx-%lx\n", | |
298af9d8 | 149 | end, e820_table_start << PAGE_SHIFT, e820_table_top << PAGE_SHIFT); |
f765090a PE |
150 | } |
151 | ||
152 | struct map_range { | |
153 | unsigned long start; | |
154 | unsigned long end; | |
155 | unsigned page_size_mask; | |
156 | }; | |
157 | ||
158 | #ifdef CONFIG_X86_32 | |
159 | #define NR_RANGE_MR 3 | |
160 | #else /* CONFIG_X86_64 */ | |
161 | #define NR_RANGE_MR 5 | |
162 | #endif | |
163 | ||
dc9dd5cc JB |
164 | static int __meminit save_mr(struct map_range *mr, int nr_range, |
165 | unsigned long start_pfn, unsigned long end_pfn, | |
166 | unsigned long page_size_mask) | |
f765090a PE |
167 | { |
168 | if (start_pfn < end_pfn) { | |
169 | if (nr_range >= NR_RANGE_MR) | |
170 | panic("run out of range for init_memory_mapping\n"); | |
171 | mr[nr_range].start = start_pfn<<PAGE_SHIFT; | |
172 | mr[nr_range].end = end_pfn<<PAGE_SHIFT; | |
173 | mr[nr_range].page_size_mask = page_size_mask; | |
174 | nr_range++; | |
175 | } | |
176 | ||
177 | return nr_range; | |
178 | } | |
179 | ||
180 | #ifdef CONFIG_X86_64 | |
181 | static void __init init_gbpages(void) | |
182 | { | |
183 | if (direct_gbpages && cpu_has_gbpages) | |
184 | printk(KERN_INFO "Using GB pages for direct mapping\n"); | |
185 | else | |
186 | direct_gbpages = 0; | |
187 | } | |
188 | #else | |
189 | static inline void init_gbpages(void) | |
190 | { | |
191 | } | |
192 | #endif | |
193 | ||
194 | /* | |
195 | * Setup the direct mapping of the physical memory at PAGE_OFFSET. | |
196 | * This runs before bootmem is initialized and gets pages directly from | |
197 | * the physical memory. To access them they are temporarily mapped. | |
198 | */ | |
199 | unsigned long __init_refok init_memory_mapping(unsigned long start, | |
200 | unsigned long end) | |
201 | { | |
202 | unsigned long page_size_mask = 0; | |
203 | unsigned long start_pfn, end_pfn; | |
c77a3b59 | 204 | unsigned long ret = 0; |
f765090a | 205 | unsigned long pos; |
f765090a PE |
206 | |
207 | struct map_range mr[NR_RANGE_MR]; | |
208 | int nr_range, i; | |
209 | int use_pse, use_gbpages; | |
210 | ||
211 | printk(KERN_INFO "init_memory_mapping: %016lx-%016lx\n", start, end); | |
212 | ||
213 | if (!after_bootmem) | |
214 | init_gbpages(); | |
215 | ||
216 | #ifdef CONFIG_DEBUG_PAGEALLOC | |
217 | /* | |
218 | * For CONFIG_DEBUG_PAGEALLOC, identity mapping will use small pages. | |
219 | * This will simplify cpa(), which otherwise needs to support splitting | |
220 | * large pages into small in interrupt context, etc. | |
221 | */ | |
222 | use_pse = use_gbpages = 0; | |
223 | #else | |
224 | use_pse = cpu_has_pse; | |
225 | use_gbpages = direct_gbpages; | |
226 | #endif | |
227 | ||
f765090a PE |
228 | set_nx(); |
229 | if (nx_enabled) | |
230 | printk(KERN_INFO "NX (Execute Disable) protection: active\n"); | |
f765090a PE |
231 | |
232 | /* Enable PSE if available */ | |
233 | if (cpu_has_pse) | |
234 | set_in_cr4(X86_CR4_PSE); | |
235 | ||
236 | /* Enable PGE if available */ | |
237 | if (cpu_has_pge) { | |
238 | set_in_cr4(X86_CR4_PGE); | |
239 | __supported_pte_mask |= _PAGE_GLOBAL; | |
240 | } | |
f765090a PE |
241 | |
242 | if (use_gbpages) | |
243 | page_size_mask |= 1 << PG_LEVEL_1G; | |
244 | if (use_pse) | |
245 | page_size_mask |= 1 << PG_LEVEL_2M; | |
246 | ||
247 | memset(mr, 0, sizeof(mr)); | |
248 | nr_range = 0; | |
249 | ||
250 | /* head if not big page alignment ? */ | |
251 | start_pfn = start >> PAGE_SHIFT; | |
252 | pos = start_pfn << PAGE_SHIFT; | |
253 | #ifdef CONFIG_X86_32 | |
254 | /* | |
255 | * Don't use a large page for the first 2/4MB of memory | |
256 | * because there are often fixed size MTRRs in there | |
257 | * and overlapping MTRRs into large pages can cause | |
258 | * slowdowns. | |
259 | */ | |
260 | if (pos == 0) | |
261 | end_pfn = 1<<(PMD_SHIFT - PAGE_SHIFT); | |
262 | else | |
263 | end_pfn = ((pos + (PMD_SIZE - 1))>>PMD_SHIFT) | |
264 | << (PMD_SHIFT - PAGE_SHIFT); | |
265 | #else /* CONFIG_X86_64 */ | |
266 | end_pfn = ((pos + (PMD_SIZE - 1)) >> PMD_SHIFT) | |
267 | << (PMD_SHIFT - PAGE_SHIFT); | |
268 | #endif | |
269 | if (end_pfn > (end >> PAGE_SHIFT)) | |
270 | end_pfn = end >> PAGE_SHIFT; | |
271 | if (start_pfn < end_pfn) { | |
272 | nr_range = save_mr(mr, nr_range, start_pfn, end_pfn, 0); | |
273 | pos = end_pfn << PAGE_SHIFT; | |
274 | } | |
275 | ||
276 | /* big page (2M) range */ | |
277 | start_pfn = ((pos + (PMD_SIZE - 1))>>PMD_SHIFT) | |
278 | << (PMD_SHIFT - PAGE_SHIFT); | |
279 | #ifdef CONFIG_X86_32 | |
280 | end_pfn = (end>>PMD_SHIFT) << (PMD_SHIFT - PAGE_SHIFT); | |
281 | #else /* CONFIG_X86_64 */ | |
282 | end_pfn = ((pos + (PUD_SIZE - 1))>>PUD_SHIFT) | |
283 | << (PUD_SHIFT - PAGE_SHIFT); | |
284 | if (end_pfn > ((end>>PMD_SHIFT)<<(PMD_SHIFT - PAGE_SHIFT))) | |
285 | end_pfn = ((end>>PMD_SHIFT)<<(PMD_SHIFT - PAGE_SHIFT)); | |
286 | #endif | |
287 | ||
288 | if (start_pfn < end_pfn) { | |
289 | nr_range = save_mr(mr, nr_range, start_pfn, end_pfn, | |
290 | page_size_mask & (1<<PG_LEVEL_2M)); | |
291 | pos = end_pfn << PAGE_SHIFT; | |
292 | } | |
293 | ||
294 | #ifdef CONFIG_X86_64 | |
295 | /* big page (1G) range */ | |
296 | start_pfn = ((pos + (PUD_SIZE - 1))>>PUD_SHIFT) | |
297 | << (PUD_SHIFT - PAGE_SHIFT); | |
298 | end_pfn = (end >> PUD_SHIFT) << (PUD_SHIFT - PAGE_SHIFT); | |
299 | if (start_pfn < end_pfn) { | |
300 | nr_range = save_mr(mr, nr_range, start_pfn, end_pfn, | |
301 | page_size_mask & | |
302 | ((1<<PG_LEVEL_2M)|(1<<PG_LEVEL_1G))); | |
303 | pos = end_pfn << PAGE_SHIFT; | |
304 | } | |
305 | ||
306 | /* tail is not big page (1G) alignment */ | |
307 | start_pfn = ((pos + (PMD_SIZE - 1))>>PMD_SHIFT) | |
308 | << (PMD_SHIFT - PAGE_SHIFT); | |
309 | end_pfn = (end >> PMD_SHIFT) << (PMD_SHIFT - PAGE_SHIFT); | |
310 | if (start_pfn < end_pfn) { | |
311 | nr_range = save_mr(mr, nr_range, start_pfn, end_pfn, | |
312 | page_size_mask & (1<<PG_LEVEL_2M)); | |
313 | pos = end_pfn << PAGE_SHIFT; | |
314 | } | |
315 | #endif | |
316 | ||
317 | /* tail is not big page (2M) alignment */ | |
318 | start_pfn = pos>>PAGE_SHIFT; | |
319 | end_pfn = end>>PAGE_SHIFT; | |
320 | nr_range = save_mr(mr, nr_range, start_pfn, end_pfn, 0); | |
321 | ||
322 | /* try to merge same page size and continuous */ | |
323 | for (i = 0; nr_range > 1 && i < nr_range - 1; i++) { | |
324 | unsigned long old_start; | |
325 | if (mr[i].end != mr[i+1].start || | |
326 | mr[i].page_size_mask != mr[i+1].page_size_mask) | |
327 | continue; | |
328 | /* move it */ | |
329 | old_start = mr[i].start; | |
330 | memmove(&mr[i], &mr[i+1], | |
331 | (nr_range - 1 - i) * sizeof(struct map_range)); | |
332 | mr[i--].start = old_start; | |
333 | nr_range--; | |
334 | } | |
335 | ||
336 | for (i = 0; i < nr_range; i++) | |
337 | printk(KERN_DEBUG " %010lx - %010lx page %s\n", | |
338 | mr[i].start, mr[i].end, | |
339 | (mr[i].page_size_mask & (1<<PG_LEVEL_1G))?"1G":( | |
340 | (mr[i].page_size_mask & (1<<PG_LEVEL_2M))?"2M":"4k")); | |
341 | ||
342 | /* | |
343 | * Find space for the kernel direct mapping tables. | |
344 | * | |
345 | * Later we should allocate these tables in the local node of the | |
346 | * memory mapped. Unfortunately this is done currently before the | |
347 | * nodes are discovered. | |
348 | */ | |
349 | if (!after_bootmem) | |
350 | find_early_table_space(end, use_pse, use_gbpages); | |
351 | ||
352 | #ifdef CONFIG_X86_32 | |
353 | for (i = 0; i < nr_range; i++) | |
e53fb04f PE |
354 | kernel_physical_mapping_init(mr[i].start, mr[i].end, |
355 | mr[i].page_size_mask); | |
f765090a PE |
356 | ret = end; |
357 | #else /* CONFIG_X86_64 */ | |
358 | for (i = 0; i < nr_range; i++) | |
359 | ret = kernel_physical_mapping_init(mr[i].start, mr[i].end, | |
360 | mr[i].page_size_mask); | |
361 | #endif | |
362 | ||
363 | #ifdef CONFIG_X86_32 | |
364 | early_ioremap_page_table_range_init(); | |
365 | ||
366 | load_cr3(swapper_pg_dir); | |
367 | #endif | |
368 | ||
369 | #ifdef CONFIG_X86_64 | |
49834396 JB |
370 | if (!after_bootmem && !start) { |
371 | pud_t *pud; | |
372 | pmd_t *pmd; | |
373 | ||
f765090a | 374 | mmu_cr4_features = read_cr4(); |
49834396 JB |
375 | |
376 | /* | |
377 | * _brk_end cannot change anymore, but it and _end may be | |
378 | * located on different 2M pages. cleanup_highmap(), however, | |
379 | * can only consider _end when it runs, so destroy any | |
380 | * mappings beyond _brk_end here. | |
381 | */ | |
382 | pud = pud_offset(pgd_offset_k(_brk_end), _brk_end); | |
383 | pmd = pmd_offset(pud, _brk_end - 1); | |
384 | while (++pmd <= pmd_offset(pud, (unsigned long)_end - 1)) | |
385 | pmd_clear(pmd); | |
386 | } | |
f765090a PE |
387 | #endif |
388 | __flush_tlb_all(); | |
389 | ||
298af9d8 PE |
390 | if (!after_bootmem && e820_table_end > e820_table_start) |
391 | reserve_early(e820_table_start << PAGE_SHIFT, | |
392 | e820_table_end << PAGE_SHIFT, "PGTABLE"); | |
f765090a PE |
393 | |
394 | if (!after_bootmem) | |
395 | early_memtest(start, end); | |
396 | ||
397 | return ret >> PAGE_SHIFT; | |
398 | } | |
399 | ||
e5b2bb55 | 400 | |
540aca06 PE |
401 | /* |
402 | * devmem_is_allowed() checks to see if /dev/mem access to a certain address | |
403 | * is valid. The argument is a physical page number. | |
404 | * | |
405 | * | |
406 | * On x86, access has to be given to the first megabyte of ram because that area | |
407 | * contains bios code and data regions used by X and dosemu and similar apps. | |
408 | * Access has to be given to non-kernel-ram areas as well, these contain the PCI | |
409 | * mmio resources as well as potential bios/acpi data regions. | |
410 | */ | |
411 | int devmem_is_allowed(unsigned long pagenr) | |
412 | { | |
413 | if (pagenr <= 256) | |
414 | return 1; | |
415 | if (iomem_is_exclusive(pagenr << PAGE_SHIFT)) | |
416 | return 0; | |
417 | if (!page_is_ram(pagenr)) | |
418 | return 1; | |
419 | return 0; | |
420 | } | |
421 | ||
e5b2bb55 PE |
422 | void free_init_pages(char *what, unsigned long begin, unsigned long end) |
423 | { | |
424 | unsigned long addr = begin; | |
425 | ||
426 | if (addr >= end) | |
427 | return; | |
428 | ||
429 | /* | |
430 | * If debugging page accesses then do not free this memory but | |
431 | * mark them not present - any buggy init-section access will | |
432 | * create a kernel page fault: | |
433 | */ | |
434 | #ifdef CONFIG_DEBUG_PAGEALLOC | |
435 | printk(KERN_INFO "debug: unmapping init memory %08lx..%08lx\n", | |
436 | begin, PAGE_ALIGN(end)); | |
437 | set_memory_np(begin, (end - begin) >> PAGE_SHIFT); | |
438 | #else | |
439 | /* | |
440 | * We just marked the kernel text read only above, now that | |
441 | * we are going to free part of that, we need to make that | |
442 | * writeable first. | |
443 | */ | |
444 | set_memory_rw(begin, (end - begin) >> PAGE_SHIFT); | |
445 | ||
446 | printk(KERN_INFO "Freeing %s: %luk freed\n", what, (end - begin) >> 10); | |
447 | ||
448 | for (; addr < end; addr += PAGE_SIZE) { | |
449 | ClearPageReserved(virt_to_page(addr)); | |
450 | init_page_count(virt_to_page(addr)); | |
451 | memset((void *)(addr & ~(PAGE_SIZE-1)), | |
452 | POISON_FREE_INITMEM, PAGE_SIZE); | |
453 | free_page(addr); | |
454 | totalram_pages++; | |
455 | } | |
456 | #endif | |
457 | } | |
458 | ||
459 | void free_initmem(void) | |
460 | { | |
461 | free_init_pages("unused kernel memory", | |
462 | (unsigned long)(&__init_begin), | |
463 | (unsigned long)(&__init_end)); | |
464 | } | |
731ddea6 PE |
465 | |
466 | #ifdef CONFIG_BLK_DEV_INITRD | |
467 | void free_initrd_mem(unsigned long start, unsigned long end) | |
468 | { | |
469 | free_init_pages("initrd memory", start, end); | |
470 | } | |
471 | #endif |