Commit | Line | Data |
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5a0e3ad6 | 1 | #include <linux/gfp.h> |
2c1b284e | 2 | #include <linux/initrd.h> |
540aca06 | 3 | #include <linux/ioport.h> |
e5b2bb55 | 4 | #include <linux/swap.h> |
540aca06 | 5 | |
e5b2bb55 | 6 | #include <asm/cacheflush.h> |
f765090a | 7 | #include <asm/e820.h> |
4fcb2083 | 8 | #include <asm/init.h> |
e5b2bb55 | 9 | #include <asm/page.h> |
540aca06 | 10 | #include <asm/page_types.h> |
e5b2bb55 | 11 | #include <asm/sections.h> |
49834396 | 12 | #include <asm/setup.h> |
e5b2bb55 | 13 | #include <asm/system.h> |
f765090a | 14 | #include <asm/tlbflush.h> |
9518e0e4 | 15 | #include <asm/tlb.h> |
76c06927 | 16 | #include <asm/proto.h> |
9518e0e4 PE |
17 | |
18 | DEFINE_PER_CPU(struct mmu_gather, mmu_gathers); | |
f765090a | 19 | |
298af9d8 PE |
20 | unsigned long __initdata e820_table_start; |
21 | unsigned long __meminitdata e820_table_end; | |
22 | unsigned long __meminitdata e820_table_top; | |
f765090a PE |
23 | |
24 | int after_bootmem; | |
25 | ||
26 | int direct_gbpages | |
27 | #ifdef CONFIG_DIRECT_GBPAGES | |
28 | = 1 | |
29 | #endif | |
30 | ; | |
31 | ||
32 | static void __init find_early_table_space(unsigned long end, int use_pse, | |
33 | int use_gbpages) | |
34 | { | |
35 | unsigned long puds, pmds, ptes, tables, start; | |
36 | ||
37 | puds = (end + PUD_SIZE - 1) >> PUD_SHIFT; | |
38 | tables = roundup(puds * sizeof(pud_t), PAGE_SIZE); | |
39 | ||
40 | if (use_gbpages) { | |
41 | unsigned long extra; | |
42 | ||
43 | extra = end - ((end>>PUD_SHIFT) << PUD_SHIFT); | |
44 | pmds = (extra + PMD_SIZE - 1) >> PMD_SHIFT; | |
45 | } else | |
46 | pmds = (end + PMD_SIZE - 1) >> PMD_SHIFT; | |
47 | ||
48 | tables += roundup(pmds * sizeof(pmd_t), PAGE_SIZE); | |
49 | ||
50 | if (use_pse) { | |
51 | unsigned long extra; | |
52 | ||
53 | extra = end - ((end>>PMD_SHIFT) << PMD_SHIFT); | |
54 | #ifdef CONFIG_X86_32 | |
55 | extra += PMD_SIZE; | |
56 | #endif | |
57 | ptes = (extra + PAGE_SIZE - 1) >> PAGE_SHIFT; | |
58 | } else | |
59 | ptes = (end + PAGE_SIZE - 1) >> PAGE_SHIFT; | |
60 | ||
61 | tables += roundup(ptes * sizeof(pte_t), PAGE_SIZE); | |
62 | ||
63 | #ifdef CONFIG_X86_32 | |
64 | /* for fixmap */ | |
65 | tables += roundup(__end_of_fixed_addresses * sizeof(pte_t), PAGE_SIZE); | |
66 | #endif | |
67 | ||
68 | /* | |
69 | * RED-PEN putting page tables only on node 0 could | |
70 | * cause a hotspot and fill up ZONE_DMA. The page tables | |
71 | * need roughly 0.5KB per GB. | |
72 | */ | |
73 | #ifdef CONFIG_X86_32 | |
74 | start = 0x7000; | |
80989ce0 | 75 | #else |
f765090a | 76 | start = 0x8000; |
f765090a | 77 | #endif |
80989ce0 YL |
78 | e820_table_start = find_e820_area(start, max_pfn_mapped<<PAGE_SHIFT, |
79 | tables, PAGE_SIZE); | |
298af9d8 | 80 | if (e820_table_start == -1UL) |
f765090a PE |
81 | panic("Cannot find space for the kernel page tables"); |
82 | ||
298af9d8 PE |
83 | e820_table_start >>= PAGE_SHIFT; |
84 | e820_table_end = e820_table_start; | |
85 | e820_table_top = e820_table_start + (tables >> PAGE_SHIFT); | |
f765090a PE |
86 | |
87 | printk(KERN_DEBUG "kernel direct mapping tables up to %lx @ %lx-%lx\n", | |
298af9d8 | 88 | end, e820_table_start << PAGE_SHIFT, e820_table_top << PAGE_SHIFT); |
f765090a PE |
89 | } |
90 | ||
91 | struct map_range { | |
92 | unsigned long start; | |
93 | unsigned long end; | |
94 | unsigned page_size_mask; | |
95 | }; | |
96 | ||
97 | #ifdef CONFIG_X86_32 | |
98 | #define NR_RANGE_MR 3 | |
99 | #else /* CONFIG_X86_64 */ | |
100 | #define NR_RANGE_MR 5 | |
101 | #endif | |
102 | ||
dc9dd5cc JB |
103 | static int __meminit save_mr(struct map_range *mr, int nr_range, |
104 | unsigned long start_pfn, unsigned long end_pfn, | |
105 | unsigned long page_size_mask) | |
f765090a PE |
106 | { |
107 | if (start_pfn < end_pfn) { | |
108 | if (nr_range >= NR_RANGE_MR) | |
109 | panic("run out of range for init_memory_mapping\n"); | |
110 | mr[nr_range].start = start_pfn<<PAGE_SHIFT; | |
111 | mr[nr_range].end = end_pfn<<PAGE_SHIFT; | |
112 | mr[nr_range].page_size_mask = page_size_mask; | |
113 | nr_range++; | |
114 | } | |
115 | ||
116 | return nr_range; | |
117 | } | |
118 | ||
f765090a PE |
119 | /* |
120 | * Setup the direct mapping of the physical memory at PAGE_OFFSET. | |
121 | * This runs before bootmem is initialized and gets pages directly from | |
122 | * the physical memory. To access them they are temporarily mapped. | |
123 | */ | |
124 | unsigned long __init_refok init_memory_mapping(unsigned long start, | |
125 | unsigned long end) | |
126 | { | |
127 | unsigned long page_size_mask = 0; | |
128 | unsigned long start_pfn, end_pfn; | |
c77a3b59 | 129 | unsigned long ret = 0; |
f765090a | 130 | unsigned long pos; |
f765090a PE |
131 | |
132 | struct map_range mr[NR_RANGE_MR]; | |
133 | int nr_range, i; | |
134 | int use_pse, use_gbpages; | |
135 | ||
136 | printk(KERN_INFO "init_memory_mapping: %016lx-%016lx\n", start, end); | |
137 | ||
f8561296 | 138 | #if defined(CONFIG_DEBUG_PAGEALLOC) || defined(CONFIG_KMEMCHECK) |
f765090a PE |
139 | /* |
140 | * For CONFIG_DEBUG_PAGEALLOC, identity mapping will use small pages. | |
141 | * This will simplify cpa(), which otherwise needs to support splitting | |
142 | * large pages into small in interrupt context, etc. | |
143 | */ | |
144 | use_pse = use_gbpages = 0; | |
145 | #else | |
146 | use_pse = cpu_has_pse; | |
147 | use_gbpages = direct_gbpages; | |
148 | #endif | |
149 | ||
f765090a PE |
150 | /* Enable PSE if available */ |
151 | if (cpu_has_pse) | |
152 | set_in_cr4(X86_CR4_PSE); | |
153 | ||
154 | /* Enable PGE if available */ | |
155 | if (cpu_has_pge) { | |
156 | set_in_cr4(X86_CR4_PGE); | |
157 | __supported_pte_mask |= _PAGE_GLOBAL; | |
158 | } | |
f765090a PE |
159 | |
160 | if (use_gbpages) | |
161 | page_size_mask |= 1 << PG_LEVEL_1G; | |
162 | if (use_pse) | |
163 | page_size_mask |= 1 << PG_LEVEL_2M; | |
164 | ||
165 | memset(mr, 0, sizeof(mr)); | |
166 | nr_range = 0; | |
167 | ||
168 | /* head if not big page alignment ? */ | |
169 | start_pfn = start >> PAGE_SHIFT; | |
170 | pos = start_pfn << PAGE_SHIFT; | |
171 | #ifdef CONFIG_X86_32 | |
172 | /* | |
173 | * Don't use a large page for the first 2/4MB of memory | |
174 | * because there are often fixed size MTRRs in there | |
175 | * and overlapping MTRRs into large pages can cause | |
176 | * slowdowns. | |
177 | */ | |
178 | if (pos == 0) | |
179 | end_pfn = 1<<(PMD_SHIFT - PAGE_SHIFT); | |
180 | else | |
181 | end_pfn = ((pos + (PMD_SIZE - 1))>>PMD_SHIFT) | |
182 | << (PMD_SHIFT - PAGE_SHIFT); | |
183 | #else /* CONFIG_X86_64 */ | |
184 | end_pfn = ((pos + (PMD_SIZE - 1)) >> PMD_SHIFT) | |
185 | << (PMD_SHIFT - PAGE_SHIFT); | |
186 | #endif | |
187 | if (end_pfn > (end >> PAGE_SHIFT)) | |
188 | end_pfn = end >> PAGE_SHIFT; | |
189 | if (start_pfn < end_pfn) { | |
190 | nr_range = save_mr(mr, nr_range, start_pfn, end_pfn, 0); | |
191 | pos = end_pfn << PAGE_SHIFT; | |
192 | } | |
193 | ||
194 | /* big page (2M) range */ | |
195 | start_pfn = ((pos + (PMD_SIZE - 1))>>PMD_SHIFT) | |
196 | << (PMD_SHIFT - PAGE_SHIFT); | |
197 | #ifdef CONFIG_X86_32 | |
198 | end_pfn = (end>>PMD_SHIFT) << (PMD_SHIFT - PAGE_SHIFT); | |
199 | #else /* CONFIG_X86_64 */ | |
200 | end_pfn = ((pos + (PUD_SIZE - 1))>>PUD_SHIFT) | |
201 | << (PUD_SHIFT - PAGE_SHIFT); | |
202 | if (end_pfn > ((end>>PMD_SHIFT)<<(PMD_SHIFT - PAGE_SHIFT))) | |
203 | end_pfn = ((end>>PMD_SHIFT)<<(PMD_SHIFT - PAGE_SHIFT)); | |
204 | #endif | |
205 | ||
206 | if (start_pfn < end_pfn) { | |
207 | nr_range = save_mr(mr, nr_range, start_pfn, end_pfn, | |
208 | page_size_mask & (1<<PG_LEVEL_2M)); | |
209 | pos = end_pfn << PAGE_SHIFT; | |
210 | } | |
211 | ||
212 | #ifdef CONFIG_X86_64 | |
213 | /* big page (1G) range */ | |
214 | start_pfn = ((pos + (PUD_SIZE - 1))>>PUD_SHIFT) | |
215 | << (PUD_SHIFT - PAGE_SHIFT); | |
216 | end_pfn = (end >> PUD_SHIFT) << (PUD_SHIFT - PAGE_SHIFT); | |
217 | if (start_pfn < end_pfn) { | |
218 | nr_range = save_mr(mr, nr_range, start_pfn, end_pfn, | |
219 | page_size_mask & | |
220 | ((1<<PG_LEVEL_2M)|(1<<PG_LEVEL_1G))); | |
221 | pos = end_pfn << PAGE_SHIFT; | |
222 | } | |
223 | ||
224 | /* tail is not big page (1G) alignment */ | |
225 | start_pfn = ((pos + (PMD_SIZE - 1))>>PMD_SHIFT) | |
226 | << (PMD_SHIFT - PAGE_SHIFT); | |
227 | end_pfn = (end >> PMD_SHIFT) << (PMD_SHIFT - PAGE_SHIFT); | |
228 | if (start_pfn < end_pfn) { | |
229 | nr_range = save_mr(mr, nr_range, start_pfn, end_pfn, | |
230 | page_size_mask & (1<<PG_LEVEL_2M)); | |
231 | pos = end_pfn << PAGE_SHIFT; | |
232 | } | |
233 | #endif | |
234 | ||
235 | /* tail is not big page (2M) alignment */ | |
236 | start_pfn = pos>>PAGE_SHIFT; | |
237 | end_pfn = end>>PAGE_SHIFT; | |
238 | nr_range = save_mr(mr, nr_range, start_pfn, end_pfn, 0); | |
239 | ||
240 | /* try to merge same page size and continuous */ | |
241 | for (i = 0; nr_range > 1 && i < nr_range - 1; i++) { | |
242 | unsigned long old_start; | |
243 | if (mr[i].end != mr[i+1].start || | |
244 | mr[i].page_size_mask != mr[i+1].page_size_mask) | |
245 | continue; | |
246 | /* move it */ | |
247 | old_start = mr[i].start; | |
248 | memmove(&mr[i], &mr[i+1], | |
249 | (nr_range - 1 - i) * sizeof(struct map_range)); | |
250 | mr[i--].start = old_start; | |
251 | nr_range--; | |
252 | } | |
253 | ||
254 | for (i = 0; i < nr_range; i++) | |
255 | printk(KERN_DEBUG " %010lx - %010lx page %s\n", | |
256 | mr[i].start, mr[i].end, | |
257 | (mr[i].page_size_mask & (1<<PG_LEVEL_1G))?"1G":( | |
258 | (mr[i].page_size_mask & (1<<PG_LEVEL_2M))?"2M":"4k")); | |
259 | ||
260 | /* | |
261 | * Find space for the kernel direct mapping tables. | |
262 | * | |
263 | * Later we should allocate these tables in the local node of the | |
264 | * memory mapped. Unfortunately this is done currently before the | |
265 | * nodes are discovered. | |
266 | */ | |
267 | if (!after_bootmem) | |
268 | find_early_table_space(end, use_pse, use_gbpages); | |
269 | ||
f765090a PE |
270 | for (i = 0; i < nr_range; i++) |
271 | ret = kernel_physical_mapping_init(mr[i].start, mr[i].end, | |
272 | mr[i].page_size_mask); | |
f765090a PE |
273 | |
274 | #ifdef CONFIG_X86_32 | |
275 | early_ioremap_page_table_range_init(); | |
276 | ||
277 | load_cr3(swapper_pg_dir); | |
278 | #endif | |
279 | ||
280 | #ifdef CONFIG_X86_64 | |
49834396 JB |
281 | if (!after_bootmem && !start) { |
282 | pud_t *pud; | |
283 | pmd_t *pmd; | |
284 | ||
f765090a | 285 | mmu_cr4_features = read_cr4(); |
49834396 JB |
286 | |
287 | /* | |
288 | * _brk_end cannot change anymore, but it and _end may be | |
289 | * located on different 2M pages. cleanup_highmap(), however, | |
290 | * can only consider _end when it runs, so destroy any | |
291 | * mappings beyond _brk_end here. | |
292 | */ | |
293 | pud = pud_offset(pgd_offset_k(_brk_end), _brk_end); | |
294 | pmd = pmd_offset(pud, _brk_end - 1); | |
295 | while (++pmd <= pmd_offset(pud, (unsigned long)_end - 1)) | |
296 | pmd_clear(pmd); | |
297 | } | |
f765090a PE |
298 | #endif |
299 | __flush_tlb_all(); | |
300 | ||
298af9d8 PE |
301 | if (!after_bootmem && e820_table_end > e820_table_start) |
302 | reserve_early(e820_table_start << PAGE_SHIFT, | |
303 | e820_table_end << PAGE_SHIFT, "PGTABLE"); | |
f765090a PE |
304 | |
305 | if (!after_bootmem) | |
306 | early_memtest(start, end); | |
307 | ||
308 | return ret >> PAGE_SHIFT; | |
309 | } | |
310 | ||
e5b2bb55 | 311 | |
540aca06 PE |
312 | /* |
313 | * devmem_is_allowed() checks to see if /dev/mem access to a certain address | |
314 | * is valid. The argument is a physical page number. | |
315 | * | |
316 | * | |
317 | * On x86, access has to be given to the first megabyte of ram because that area | |
318 | * contains bios code and data regions used by X and dosemu and similar apps. | |
319 | * Access has to be given to non-kernel-ram areas as well, these contain the PCI | |
320 | * mmio resources as well as potential bios/acpi data regions. | |
321 | */ | |
322 | int devmem_is_allowed(unsigned long pagenr) | |
323 | { | |
324 | if (pagenr <= 256) | |
325 | return 1; | |
326 | if (iomem_is_exclusive(pagenr << PAGE_SHIFT)) | |
327 | return 0; | |
328 | if (!page_is_ram(pagenr)) | |
329 | return 1; | |
330 | return 0; | |
331 | } | |
332 | ||
e5b2bb55 PE |
333 | void free_init_pages(char *what, unsigned long begin, unsigned long end) |
334 | { | |
335 | unsigned long addr = begin; | |
336 | ||
337 | if (addr >= end) | |
338 | return; | |
339 | ||
340 | /* | |
341 | * If debugging page accesses then do not free this memory but | |
342 | * mark them not present - any buggy init-section access will | |
343 | * create a kernel page fault: | |
344 | */ | |
345 | #ifdef CONFIG_DEBUG_PAGEALLOC | |
346 | printk(KERN_INFO "debug: unmapping init memory %08lx..%08lx\n", | |
347 | begin, PAGE_ALIGN(end)); | |
348 | set_memory_np(begin, (end - begin) >> PAGE_SHIFT); | |
349 | #else | |
350 | /* | |
351 | * We just marked the kernel text read only above, now that | |
352 | * we are going to free part of that, we need to make that | |
353 | * writeable first. | |
354 | */ | |
355 | set_memory_rw(begin, (end - begin) >> PAGE_SHIFT); | |
356 | ||
357 | printk(KERN_INFO "Freeing %s: %luk freed\n", what, (end - begin) >> 10); | |
358 | ||
359 | for (; addr < end; addr += PAGE_SIZE) { | |
360 | ClearPageReserved(virt_to_page(addr)); | |
361 | init_page_count(virt_to_page(addr)); | |
362 | memset((void *)(addr & ~(PAGE_SIZE-1)), | |
363 | POISON_FREE_INITMEM, PAGE_SIZE); | |
364 | free_page(addr); | |
365 | totalram_pages++; | |
366 | } | |
367 | #endif | |
368 | } | |
369 | ||
370 | void free_initmem(void) | |
371 | { | |
372 | free_init_pages("unused kernel memory", | |
373 | (unsigned long)(&__init_begin), | |
374 | (unsigned long)(&__init_end)); | |
375 | } | |
731ddea6 PE |
376 | |
377 | #ifdef CONFIG_BLK_DEV_INITRD | |
378 | void free_initrd_mem(unsigned long start, unsigned long end) | |
379 | { | |
380 | free_init_pages("initrd memory", start, end); | |
381 | } | |
382 | #endif |