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> |
a9ce6bc1 | 5 | #include <linux/memblock.h> |
17623915 | 6 | #include <linux/bootmem.h> /* for max_low_pfn */ |
540aca06 | 7 | |
e5b2bb55 | 8 | #include <asm/cacheflush.h> |
f765090a | 9 | #include <asm/e820.h> |
4fcb2083 | 10 | #include <asm/init.h> |
e5b2bb55 | 11 | #include <asm/page.h> |
540aca06 | 12 | #include <asm/page_types.h> |
e5b2bb55 | 13 | #include <asm/sections.h> |
49834396 | 14 | #include <asm/setup.h> |
f765090a | 15 | #include <asm/tlbflush.h> |
9518e0e4 | 16 | #include <asm/tlb.h> |
76c06927 | 17 | #include <asm/proto.h> |
17623915 | 18 | #include <asm/dma.h> /* for MAX_DMA_PFN */ |
9518e0e4 | 19 | |
d1b19426 YL |
20 | unsigned long __initdata pgt_buf_start; |
21 | unsigned long __meminitdata pgt_buf_end; | |
22 | unsigned long __meminitdata pgt_buf_top; | |
f765090a PE |
23 | |
24 | int after_bootmem; | |
25 | ||
26 | int direct_gbpages | |
27 | #ifdef CONFIG_DIRECT_GBPAGES | |
28 | = 1 | |
29 | #endif | |
30 | ; | |
31 | ||
722bc6b1 WC |
32 | struct map_range { |
33 | unsigned long start; | |
34 | unsigned long end; | |
35 | unsigned page_size_mask; | |
36 | }; | |
37 | ||
38 | static void __init find_early_table_space(struct map_range *mr, unsigned long end, | |
39 | int use_pse, int use_gbpages) | |
f765090a | 40 | { |
4b239f45 | 41 | unsigned long puds, pmds, ptes, tables, start = 0, good_end = end; |
a9ce6bc1 | 42 | phys_addr_t base; |
f765090a PE |
43 | |
44 | puds = (end + PUD_SIZE - 1) >> PUD_SHIFT; | |
45 | tables = roundup(puds * sizeof(pud_t), PAGE_SIZE); | |
46 | ||
47 | if (use_gbpages) { | |
48 | unsigned long extra; | |
49 | ||
50 | extra = end - ((end>>PUD_SHIFT) << PUD_SHIFT); | |
51 | pmds = (extra + PMD_SIZE - 1) >> PMD_SHIFT; | |
52 | } else | |
53 | pmds = (end + PMD_SIZE - 1) >> PMD_SHIFT; | |
54 | ||
55 | tables += roundup(pmds * sizeof(pmd_t), PAGE_SIZE); | |
56 | ||
57 | if (use_pse) { | |
58 | unsigned long extra; | |
59 | ||
60 | extra = end - ((end>>PMD_SHIFT) << PMD_SHIFT); | |
61 | #ifdef CONFIG_X86_32 | |
62 | extra += PMD_SIZE; | |
63 | #endif | |
722bc6b1 WC |
64 | /* The first 2/4M doesn't use large pages. */ |
65 | extra += mr->end - mr->start; | |
66 | ||
f765090a PE |
67 | ptes = (extra + PAGE_SIZE - 1) >> PAGE_SHIFT; |
68 | } else | |
69 | ptes = (end + PAGE_SIZE - 1) >> PAGE_SHIFT; | |
70 | ||
71 | tables += roundup(ptes * sizeof(pte_t), PAGE_SIZE); | |
72 | ||
73 | #ifdef CONFIG_X86_32 | |
74 | /* for fixmap */ | |
75 | tables += roundup(__end_of_fixed_addresses * sizeof(pte_t), PAGE_SIZE); | |
f765090a | 76 | #endif |
8548c84d | 77 | good_end = max_pfn_mapped << PAGE_SHIFT; |
1411e0ec | 78 | |
4b239f45 | 79 | base = memblock_find_in_range(start, good_end, tables, PAGE_SIZE); |
1f5026a7 | 80 | if (!base) |
f765090a PE |
81 | panic("Cannot find space for the kernel page tables"); |
82 | ||
d1b19426 YL |
83 | pgt_buf_start = base >> PAGE_SHIFT; |
84 | pgt_buf_end = pgt_buf_start; | |
85 | pgt_buf_top = pgt_buf_start + (tables >> PAGE_SHIFT); | |
f765090a | 86 | |
365811d6 BH |
87 | printk(KERN_DEBUG "kernel direct mapping tables up to %#lx @ [mem %#010lx-%#010lx]\n", |
88 | end - 1, pgt_buf_start << PAGE_SHIFT, | |
89 | (pgt_buf_top << PAGE_SHIFT) - 1); | |
f765090a PE |
90 | } |
91 | ||
53f8023f | 92 | void __init native_pagetable_reserve(u64 start, u64 end) |
279b706b | 93 | { |
24aa0788 | 94 | memblock_reserve(start, end - start); |
279b706b SS |
95 | } |
96 | ||
f765090a PE |
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 | ||
365811d6 BH |
136 | printk(KERN_INFO "init_memory_mapping: [mem %#010lx-%#010lx]\n", |
137 | start, end - 1); | |
f765090a | 138 | |
f8561296 | 139 | #if defined(CONFIG_DEBUG_PAGEALLOC) || defined(CONFIG_KMEMCHECK) |
f765090a PE |
140 | /* |
141 | * For CONFIG_DEBUG_PAGEALLOC, identity mapping will use small pages. | |
142 | * This will simplify cpa(), which otherwise needs to support splitting | |
143 | * large pages into small in interrupt context, etc. | |
144 | */ | |
145 | use_pse = use_gbpages = 0; | |
146 | #else | |
147 | use_pse = cpu_has_pse; | |
148 | use_gbpages = direct_gbpages; | |
149 | #endif | |
150 | ||
f765090a PE |
151 | /* Enable PSE if available */ |
152 | if (cpu_has_pse) | |
153 | set_in_cr4(X86_CR4_PSE); | |
154 | ||
155 | /* Enable PGE if available */ | |
156 | if (cpu_has_pge) { | |
157 | set_in_cr4(X86_CR4_PGE); | |
158 | __supported_pte_mask |= _PAGE_GLOBAL; | |
159 | } | |
f765090a PE |
160 | |
161 | if (use_gbpages) | |
162 | page_size_mask |= 1 << PG_LEVEL_1G; | |
163 | if (use_pse) | |
164 | page_size_mask |= 1 << PG_LEVEL_2M; | |
165 | ||
166 | memset(mr, 0, sizeof(mr)); | |
167 | nr_range = 0; | |
168 | ||
169 | /* head if not big page alignment ? */ | |
170 | start_pfn = start >> PAGE_SHIFT; | |
171 | pos = start_pfn << PAGE_SHIFT; | |
172 | #ifdef CONFIG_X86_32 | |
173 | /* | |
174 | * Don't use a large page for the first 2/4MB of memory | |
175 | * because there are often fixed size MTRRs in there | |
176 | * and overlapping MTRRs into large pages can cause | |
177 | * slowdowns. | |
178 | */ | |
179 | if (pos == 0) | |
180 | end_pfn = 1<<(PMD_SHIFT - PAGE_SHIFT); | |
181 | else | |
182 | end_pfn = ((pos + (PMD_SIZE - 1))>>PMD_SHIFT) | |
183 | << (PMD_SHIFT - PAGE_SHIFT); | |
184 | #else /* CONFIG_X86_64 */ | |
185 | end_pfn = ((pos + (PMD_SIZE - 1)) >> PMD_SHIFT) | |
186 | << (PMD_SHIFT - PAGE_SHIFT); | |
187 | #endif | |
188 | if (end_pfn > (end >> PAGE_SHIFT)) | |
189 | end_pfn = end >> PAGE_SHIFT; | |
190 | if (start_pfn < end_pfn) { | |
191 | nr_range = save_mr(mr, nr_range, start_pfn, end_pfn, 0); | |
192 | pos = end_pfn << PAGE_SHIFT; | |
193 | } | |
194 | ||
195 | /* big page (2M) range */ | |
196 | start_pfn = ((pos + (PMD_SIZE - 1))>>PMD_SHIFT) | |
197 | << (PMD_SHIFT - PAGE_SHIFT); | |
198 | #ifdef CONFIG_X86_32 | |
199 | end_pfn = (end>>PMD_SHIFT) << (PMD_SHIFT - PAGE_SHIFT); | |
200 | #else /* CONFIG_X86_64 */ | |
201 | end_pfn = ((pos + (PUD_SIZE - 1))>>PUD_SHIFT) | |
202 | << (PUD_SHIFT - PAGE_SHIFT); | |
203 | if (end_pfn > ((end>>PMD_SHIFT)<<(PMD_SHIFT - PAGE_SHIFT))) | |
204 | end_pfn = ((end>>PMD_SHIFT)<<(PMD_SHIFT - PAGE_SHIFT)); | |
205 | #endif | |
206 | ||
207 | if (start_pfn < end_pfn) { | |
208 | nr_range = save_mr(mr, nr_range, start_pfn, end_pfn, | |
209 | page_size_mask & (1<<PG_LEVEL_2M)); | |
210 | pos = end_pfn << PAGE_SHIFT; | |
211 | } | |
212 | ||
213 | #ifdef CONFIG_X86_64 | |
214 | /* big page (1G) range */ | |
215 | start_pfn = ((pos + (PUD_SIZE - 1))>>PUD_SHIFT) | |
216 | << (PUD_SHIFT - PAGE_SHIFT); | |
217 | end_pfn = (end >> PUD_SHIFT) << (PUD_SHIFT - PAGE_SHIFT); | |
218 | if (start_pfn < end_pfn) { | |
219 | nr_range = save_mr(mr, nr_range, start_pfn, end_pfn, | |
220 | page_size_mask & | |
221 | ((1<<PG_LEVEL_2M)|(1<<PG_LEVEL_1G))); | |
222 | pos = end_pfn << PAGE_SHIFT; | |
223 | } | |
224 | ||
225 | /* tail is not big page (1G) alignment */ | |
226 | start_pfn = ((pos + (PMD_SIZE - 1))>>PMD_SHIFT) | |
227 | << (PMD_SHIFT - PAGE_SHIFT); | |
228 | end_pfn = (end >> PMD_SHIFT) << (PMD_SHIFT - PAGE_SHIFT); | |
229 | if (start_pfn < end_pfn) { | |
230 | nr_range = save_mr(mr, nr_range, start_pfn, end_pfn, | |
231 | page_size_mask & (1<<PG_LEVEL_2M)); | |
232 | pos = end_pfn << PAGE_SHIFT; | |
233 | } | |
234 | #endif | |
235 | ||
236 | /* tail is not big page (2M) alignment */ | |
237 | start_pfn = pos>>PAGE_SHIFT; | |
238 | end_pfn = end>>PAGE_SHIFT; | |
239 | nr_range = save_mr(mr, nr_range, start_pfn, end_pfn, 0); | |
240 | ||
241 | /* try to merge same page size and continuous */ | |
242 | for (i = 0; nr_range > 1 && i < nr_range - 1; i++) { | |
243 | unsigned long old_start; | |
244 | if (mr[i].end != mr[i+1].start || | |
245 | mr[i].page_size_mask != mr[i+1].page_size_mask) | |
246 | continue; | |
247 | /* move it */ | |
248 | old_start = mr[i].start; | |
249 | memmove(&mr[i], &mr[i+1], | |
250 | (nr_range - 1 - i) * sizeof(struct map_range)); | |
251 | mr[i--].start = old_start; | |
252 | nr_range--; | |
253 | } | |
254 | ||
255 | for (i = 0; i < nr_range; i++) | |
365811d6 BH |
256 | printk(KERN_DEBUG " [mem %#010lx-%#010lx] page %s\n", |
257 | mr[i].start, mr[i].end - 1, | |
f765090a PE |
258 | (mr[i].page_size_mask & (1<<PG_LEVEL_1G))?"1G":( |
259 | (mr[i].page_size_mask & (1<<PG_LEVEL_2M))?"2M":"4k")); | |
260 | ||
261 | /* | |
262 | * Find space for the kernel direct mapping tables. | |
263 | * | |
264 | * Later we should allocate these tables in the local node of the | |
265 | * memory mapped. Unfortunately this is done currently before the | |
266 | * nodes are discovered. | |
267 | */ | |
268 | if (!after_bootmem) | |
722bc6b1 | 269 | find_early_table_space(&mr[0], end, use_pse, use_gbpages); |
f765090a | 270 | |
f765090a PE |
271 | for (i = 0; i < nr_range; i++) |
272 | ret = kernel_physical_mapping_init(mr[i].start, mr[i].end, | |
273 | mr[i].page_size_mask); | |
f765090a PE |
274 | |
275 | #ifdef CONFIG_X86_32 | |
276 | early_ioremap_page_table_range_init(); | |
277 | ||
278 | load_cr3(swapper_pg_dir); | |
279 | #endif | |
280 | ||
f765090a PE |
281 | __flush_tlb_all(); |
282 | ||
279b706b SS |
283 | /* |
284 | * Reserve the kernel pagetable pages we used (pgt_buf_start - | |
285 | * pgt_buf_end) and free the other ones (pgt_buf_end - pgt_buf_top) | |
286 | * so that they can be reused for other purposes. | |
287 | * | |
24aa0788 TH |
288 | * On native it just means calling memblock_reserve, on Xen it also |
289 | * means marking RW the pagetable pages that we allocated before | |
279b706b SS |
290 | * but that haven't been used. |
291 | * | |
292 | * In fact on xen we mark RO the whole range pgt_buf_start - | |
293 | * pgt_buf_top, because we have to make sure that when | |
294 | * init_memory_mapping reaches the pagetable pages area, it maps | |
295 | * RO all the pagetable pages, including the ones that are beyond | |
296 | * pgt_buf_end at that time. | |
297 | */ | |
d1b19426 | 298 | if (!after_bootmem && pgt_buf_end > pgt_buf_start) |
279b706b SS |
299 | x86_init.mapping.pagetable_reserve(PFN_PHYS(pgt_buf_start), |
300 | PFN_PHYS(pgt_buf_end)); | |
f765090a PE |
301 | |
302 | if (!after_bootmem) | |
303 | early_memtest(start, end); | |
304 | ||
305 | return ret >> PAGE_SHIFT; | |
306 | } | |
307 | ||
e5b2bb55 | 308 | |
540aca06 PE |
309 | /* |
310 | * devmem_is_allowed() checks to see if /dev/mem access to a certain address | |
311 | * is valid. The argument is a physical page number. | |
312 | * | |
313 | * | |
314 | * On x86, access has to be given to the first megabyte of ram because that area | |
315 | * contains bios code and data regions used by X and dosemu and similar apps. | |
316 | * Access has to be given to non-kernel-ram areas as well, these contain the PCI | |
317 | * mmio resources as well as potential bios/acpi data regions. | |
318 | */ | |
319 | int devmem_is_allowed(unsigned long pagenr) | |
320 | { | |
321 | if (pagenr <= 256) | |
322 | return 1; | |
323 | if (iomem_is_exclusive(pagenr << PAGE_SHIFT)) | |
324 | return 0; | |
325 | if (!page_is_ram(pagenr)) | |
326 | return 1; | |
327 | return 0; | |
328 | } | |
329 | ||
e5b2bb55 PE |
330 | void free_init_pages(char *what, unsigned long begin, unsigned long end) |
331 | { | |
c967da6a YL |
332 | unsigned long addr; |
333 | unsigned long begin_aligned, end_aligned; | |
e5b2bb55 | 334 | |
c967da6a YL |
335 | /* Make sure boundaries are page aligned */ |
336 | begin_aligned = PAGE_ALIGN(begin); | |
337 | end_aligned = end & PAGE_MASK; | |
338 | ||
339 | if (WARN_ON(begin_aligned != begin || end_aligned != end)) { | |
340 | begin = begin_aligned; | |
341 | end = end_aligned; | |
342 | } | |
343 | ||
344 | if (begin >= end) | |
e5b2bb55 PE |
345 | return; |
346 | ||
c967da6a YL |
347 | addr = begin; |
348 | ||
e5b2bb55 PE |
349 | /* |
350 | * If debugging page accesses then do not free this memory but | |
351 | * mark them not present - any buggy init-section access will | |
352 | * create a kernel page fault: | |
353 | */ | |
354 | #ifdef CONFIG_DEBUG_PAGEALLOC | |
365811d6 BH |
355 | printk(KERN_INFO "debug: unmapping init [mem %#010lx-%#010lx]\n", |
356 | begin, end - 1); | |
e5b2bb55 PE |
357 | set_memory_np(begin, (end - begin) >> PAGE_SHIFT); |
358 | #else | |
359 | /* | |
360 | * We just marked the kernel text read only above, now that | |
361 | * we are going to free part of that, we need to make that | |
5bd5a452 | 362 | * writeable and non-executable first. |
e5b2bb55 | 363 | */ |
5bd5a452 | 364 | set_memory_nx(begin, (end - begin) >> PAGE_SHIFT); |
e5b2bb55 PE |
365 | set_memory_rw(begin, (end - begin) >> PAGE_SHIFT); |
366 | ||
367 | printk(KERN_INFO "Freeing %s: %luk freed\n", what, (end - begin) >> 10); | |
368 | ||
369 | for (; addr < end; addr += PAGE_SIZE) { | |
370 | ClearPageReserved(virt_to_page(addr)); | |
371 | init_page_count(virt_to_page(addr)); | |
c967da6a | 372 | memset((void *)addr, POISON_FREE_INITMEM, PAGE_SIZE); |
e5b2bb55 PE |
373 | free_page(addr); |
374 | totalram_pages++; | |
375 | } | |
376 | #endif | |
377 | } | |
378 | ||
379 | void free_initmem(void) | |
380 | { | |
381 | free_init_pages("unused kernel memory", | |
382 | (unsigned long)(&__init_begin), | |
383 | (unsigned long)(&__init_end)); | |
384 | } | |
731ddea6 PE |
385 | |
386 | #ifdef CONFIG_BLK_DEV_INITRD | |
387 | void free_initrd_mem(unsigned long start, unsigned long end) | |
388 | { | |
c967da6a YL |
389 | /* |
390 | * end could be not aligned, and We can not align that, | |
391 | * decompresser could be confused by aligned initrd_end | |
392 | * We already reserve the end partial page before in | |
393 | * - i386_start_kernel() | |
394 | * - x86_64_start_kernel() | |
395 | * - relocate_initrd() | |
396 | * So here We can do PAGE_ALIGN() safely to get partial page to be freed | |
397 | */ | |
398 | free_init_pages("initrd memory", start, PAGE_ALIGN(end)); | |
731ddea6 PE |
399 | } |
400 | #endif | |
17623915 PE |
401 | |
402 | void __init zone_sizes_init(void) | |
403 | { | |
404 | unsigned long max_zone_pfns[MAX_NR_ZONES]; | |
405 | ||
406 | memset(max_zone_pfns, 0, sizeof(max_zone_pfns)); | |
407 | ||
408 | #ifdef CONFIG_ZONE_DMA | |
409 | max_zone_pfns[ZONE_DMA] = MAX_DMA_PFN; | |
410 | #endif | |
411 | #ifdef CONFIG_ZONE_DMA32 | |
412 | max_zone_pfns[ZONE_DMA32] = MAX_DMA32_PFN; | |
413 | #endif | |
414 | max_zone_pfns[ZONE_NORMAL] = max_low_pfn; | |
415 | #ifdef CONFIG_HIGHMEM | |
416 | max_zone_pfns[ZONE_HIGHMEM] = max_pfn; | |
417 | #endif | |
418 | ||
419 | free_area_init_nodes(max_zone_pfns); | |
420 | } | |
421 |