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> |
e5b2bb55 | 15 | #include <asm/system.h> |
f765090a | 16 | #include <asm/tlbflush.h> |
9518e0e4 | 17 | #include <asm/tlb.h> |
76c06927 | 18 | #include <asm/proto.h> |
17623915 | 19 | #include <asm/dma.h> /* for MAX_DMA_PFN */ |
9518e0e4 | 20 | |
d1b19426 YL |
21 | unsigned long __initdata pgt_buf_start; |
22 | unsigned long __meminitdata pgt_buf_end; | |
23 | unsigned long __meminitdata pgt_buf_top; | |
f765090a PE |
24 | |
25 | int after_bootmem; | |
26 | ||
27 | int direct_gbpages | |
28 | #ifdef CONFIG_DIRECT_GBPAGES | |
29 | = 1 | |
30 | #endif | |
31 | ; | |
32 | ||
33 | static void __init find_early_table_space(unsigned long end, int use_pse, | |
34 | int use_gbpages) | |
35 | { | |
4b239f45 | 36 | unsigned long puds, pmds, ptes, tables, start = 0, good_end = end; |
a9ce6bc1 | 37 | phys_addr_t base; |
f765090a PE |
38 | |
39 | puds = (end + PUD_SIZE - 1) >> PUD_SHIFT; | |
40 | tables = roundup(puds * sizeof(pud_t), PAGE_SIZE); | |
41 | ||
42 | if (use_gbpages) { | |
43 | unsigned long extra; | |
44 | ||
45 | extra = end - ((end>>PUD_SHIFT) << PUD_SHIFT); | |
46 | pmds = (extra + PMD_SIZE - 1) >> PMD_SHIFT; | |
47 | } else | |
48 | pmds = (end + PMD_SIZE - 1) >> PMD_SHIFT; | |
49 | ||
50 | tables += roundup(pmds * sizeof(pmd_t), PAGE_SIZE); | |
51 | ||
52 | if (use_pse) { | |
53 | unsigned long extra; | |
54 | ||
55 | extra = end - ((end>>PMD_SHIFT) << PMD_SHIFT); | |
56 | #ifdef CONFIG_X86_32 | |
57 | extra += PMD_SIZE; | |
58 | #endif | |
59 | ptes = (extra + PAGE_SIZE - 1) >> PAGE_SHIFT; | |
60 | } else | |
61 | ptes = (end + PAGE_SIZE - 1) >> PAGE_SHIFT; | |
62 | ||
63 | tables += roundup(ptes * sizeof(pte_t), PAGE_SIZE); | |
64 | ||
65 | #ifdef CONFIG_X86_32 | |
66 | /* for fixmap */ | |
67 | tables += roundup(__end_of_fixed_addresses * sizeof(pte_t), PAGE_SIZE); | |
f765090a | 68 | #endif |
8548c84d | 69 | good_end = max_pfn_mapped << PAGE_SHIFT; |
1411e0ec | 70 | |
4b239f45 | 71 | base = memblock_find_in_range(start, good_end, tables, PAGE_SIZE); |
1f5026a7 | 72 | if (!base) |
f765090a PE |
73 | panic("Cannot find space for the kernel page tables"); |
74 | ||
d1b19426 YL |
75 | pgt_buf_start = base >> PAGE_SHIFT; |
76 | pgt_buf_end = pgt_buf_start; | |
77 | pgt_buf_top = pgt_buf_start + (tables >> PAGE_SHIFT); | |
f765090a PE |
78 | |
79 | printk(KERN_DEBUG "kernel direct mapping tables up to %lx @ %lx-%lx\n", | |
d1b19426 | 80 | end, pgt_buf_start << PAGE_SHIFT, pgt_buf_top << PAGE_SHIFT); |
f765090a PE |
81 | } |
82 | ||
53f8023f | 83 | void __init native_pagetable_reserve(u64 start, u64 end) |
279b706b | 84 | { |
24aa0788 | 85 | memblock_reserve(start, end - start); |
279b706b SS |
86 | } |
87 | ||
f765090a PE |
88 | struct map_range { |
89 | unsigned long start; | |
90 | unsigned long end; | |
91 | unsigned page_size_mask; | |
92 | }; | |
93 | ||
94 | #ifdef CONFIG_X86_32 | |
95 | #define NR_RANGE_MR 3 | |
96 | #else /* CONFIG_X86_64 */ | |
97 | #define NR_RANGE_MR 5 | |
98 | #endif | |
99 | ||
dc9dd5cc JB |
100 | static int __meminit save_mr(struct map_range *mr, int nr_range, |
101 | unsigned long start_pfn, unsigned long end_pfn, | |
102 | unsigned long page_size_mask) | |
f765090a PE |
103 | { |
104 | if (start_pfn < end_pfn) { | |
105 | if (nr_range >= NR_RANGE_MR) | |
106 | panic("run out of range for init_memory_mapping\n"); | |
107 | mr[nr_range].start = start_pfn<<PAGE_SHIFT; | |
108 | mr[nr_range].end = end_pfn<<PAGE_SHIFT; | |
109 | mr[nr_range].page_size_mask = page_size_mask; | |
110 | nr_range++; | |
111 | } | |
112 | ||
113 | return nr_range; | |
114 | } | |
115 | ||
f765090a PE |
116 | /* |
117 | * Setup the direct mapping of the physical memory at PAGE_OFFSET. | |
118 | * This runs before bootmem is initialized and gets pages directly from | |
119 | * the physical memory. To access them they are temporarily mapped. | |
120 | */ | |
121 | unsigned long __init_refok init_memory_mapping(unsigned long start, | |
122 | unsigned long end) | |
123 | { | |
124 | unsigned long page_size_mask = 0; | |
125 | unsigned long start_pfn, end_pfn; | |
c77a3b59 | 126 | unsigned long ret = 0; |
f765090a | 127 | unsigned long pos; |
f765090a PE |
128 | |
129 | struct map_range mr[NR_RANGE_MR]; | |
130 | int nr_range, i; | |
131 | int use_pse, use_gbpages; | |
132 | ||
133 | printk(KERN_INFO "init_memory_mapping: %016lx-%016lx\n", start, end); | |
134 | ||
f8561296 | 135 | #if defined(CONFIG_DEBUG_PAGEALLOC) || defined(CONFIG_KMEMCHECK) |
f765090a PE |
136 | /* |
137 | * For CONFIG_DEBUG_PAGEALLOC, identity mapping will use small pages. | |
138 | * This will simplify cpa(), which otherwise needs to support splitting | |
139 | * large pages into small in interrupt context, etc. | |
140 | */ | |
141 | use_pse = use_gbpages = 0; | |
142 | #else | |
143 | use_pse = cpu_has_pse; | |
144 | use_gbpages = direct_gbpages; | |
145 | #endif | |
146 | ||
f765090a PE |
147 | /* Enable PSE if available */ |
148 | if (cpu_has_pse) | |
149 | set_in_cr4(X86_CR4_PSE); | |
150 | ||
151 | /* Enable PGE if available */ | |
152 | if (cpu_has_pge) { | |
153 | set_in_cr4(X86_CR4_PGE); | |
154 | __supported_pte_mask |= _PAGE_GLOBAL; | |
155 | } | |
f765090a PE |
156 | |
157 | if (use_gbpages) | |
158 | page_size_mask |= 1 << PG_LEVEL_1G; | |
159 | if (use_pse) | |
160 | page_size_mask |= 1 << PG_LEVEL_2M; | |
161 | ||
162 | memset(mr, 0, sizeof(mr)); | |
163 | nr_range = 0; | |
164 | ||
165 | /* head if not big page alignment ? */ | |
166 | start_pfn = start >> PAGE_SHIFT; | |
167 | pos = start_pfn << PAGE_SHIFT; | |
168 | #ifdef CONFIG_X86_32 | |
169 | /* | |
170 | * Don't use a large page for the first 2/4MB of memory | |
171 | * because there are often fixed size MTRRs in there | |
172 | * and overlapping MTRRs into large pages can cause | |
173 | * slowdowns. | |
174 | */ | |
175 | if (pos == 0) | |
176 | end_pfn = 1<<(PMD_SHIFT - PAGE_SHIFT); | |
177 | else | |
178 | end_pfn = ((pos + (PMD_SIZE - 1))>>PMD_SHIFT) | |
179 | << (PMD_SHIFT - PAGE_SHIFT); | |
180 | #else /* CONFIG_X86_64 */ | |
181 | end_pfn = ((pos + (PMD_SIZE - 1)) >> PMD_SHIFT) | |
182 | << (PMD_SHIFT - PAGE_SHIFT); | |
183 | #endif | |
184 | if (end_pfn > (end >> PAGE_SHIFT)) | |
185 | end_pfn = end >> PAGE_SHIFT; | |
186 | if (start_pfn < end_pfn) { | |
187 | nr_range = save_mr(mr, nr_range, start_pfn, end_pfn, 0); | |
188 | pos = end_pfn << PAGE_SHIFT; | |
189 | } | |
190 | ||
191 | /* big page (2M) range */ | |
192 | start_pfn = ((pos + (PMD_SIZE - 1))>>PMD_SHIFT) | |
193 | << (PMD_SHIFT - PAGE_SHIFT); | |
194 | #ifdef CONFIG_X86_32 | |
195 | end_pfn = (end>>PMD_SHIFT) << (PMD_SHIFT - PAGE_SHIFT); | |
196 | #else /* CONFIG_X86_64 */ | |
197 | end_pfn = ((pos + (PUD_SIZE - 1))>>PUD_SHIFT) | |
198 | << (PUD_SHIFT - PAGE_SHIFT); | |
199 | if (end_pfn > ((end>>PMD_SHIFT)<<(PMD_SHIFT - PAGE_SHIFT))) | |
200 | end_pfn = ((end>>PMD_SHIFT)<<(PMD_SHIFT - PAGE_SHIFT)); | |
201 | #endif | |
202 | ||
203 | if (start_pfn < end_pfn) { | |
204 | nr_range = save_mr(mr, nr_range, start_pfn, end_pfn, | |
205 | page_size_mask & (1<<PG_LEVEL_2M)); | |
206 | pos = end_pfn << PAGE_SHIFT; | |
207 | } | |
208 | ||
209 | #ifdef CONFIG_X86_64 | |
210 | /* big page (1G) range */ | |
211 | start_pfn = ((pos + (PUD_SIZE - 1))>>PUD_SHIFT) | |
212 | << (PUD_SHIFT - PAGE_SHIFT); | |
213 | end_pfn = (end >> PUD_SHIFT) << (PUD_SHIFT - PAGE_SHIFT); | |
214 | if (start_pfn < end_pfn) { | |
215 | nr_range = save_mr(mr, nr_range, start_pfn, end_pfn, | |
216 | page_size_mask & | |
217 | ((1<<PG_LEVEL_2M)|(1<<PG_LEVEL_1G))); | |
218 | pos = end_pfn << PAGE_SHIFT; | |
219 | } | |
220 | ||
221 | /* tail is not big page (1G) alignment */ | |
222 | start_pfn = ((pos + (PMD_SIZE - 1))>>PMD_SHIFT) | |
223 | << (PMD_SHIFT - PAGE_SHIFT); | |
224 | end_pfn = (end >> PMD_SHIFT) << (PMD_SHIFT - PAGE_SHIFT); | |
225 | if (start_pfn < end_pfn) { | |
226 | nr_range = save_mr(mr, nr_range, start_pfn, end_pfn, | |
227 | page_size_mask & (1<<PG_LEVEL_2M)); | |
228 | pos = end_pfn << PAGE_SHIFT; | |
229 | } | |
230 | #endif | |
231 | ||
232 | /* tail is not big page (2M) alignment */ | |
233 | start_pfn = pos>>PAGE_SHIFT; | |
234 | end_pfn = end>>PAGE_SHIFT; | |
235 | nr_range = save_mr(mr, nr_range, start_pfn, end_pfn, 0); | |
236 | ||
237 | /* try to merge same page size and continuous */ | |
238 | for (i = 0; nr_range > 1 && i < nr_range - 1; i++) { | |
239 | unsigned long old_start; | |
240 | if (mr[i].end != mr[i+1].start || | |
241 | mr[i].page_size_mask != mr[i+1].page_size_mask) | |
242 | continue; | |
243 | /* move it */ | |
244 | old_start = mr[i].start; | |
245 | memmove(&mr[i], &mr[i+1], | |
246 | (nr_range - 1 - i) * sizeof(struct map_range)); | |
247 | mr[i--].start = old_start; | |
248 | nr_range--; | |
249 | } | |
250 | ||
251 | for (i = 0; i < nr_range; i++) | |
252 | printk(KERN_DEBUG " %010lx - %010lx page %s\n", | |
253 | mr[i].start, mr[i].end, | |
254 | (mr[i].page_size_mask & (1<<PG_LEVEL_1G))?"1G":( | |
255 | (mr[i].page_size_mask & (1<<PG_LEVEL_2M))?"2M":"4k")); | |
256 | ||
257 | /* | |
258 | * Find space for the kernel direct mapping tables. | |
259 | * | |
260 | * Later we should allocate these tables in the local node of the | |
261 | * memory mapped. Unfortunately this is done currently before the | |
262 | * nodes are discovered. | |
263 | */ | |
264 | if (!after_bootmem) | |
265 | find_early_table_space(end, use_pse, use_gbpages); | |
266 | ||
f765090a PE |
267 | for (i = 0; i < nr_range; i++) |
268 | ret = kernel_physical_mapping_init(mr[i].start, mr[i].end, | |
269 | mr[i].page_size_mask); | |
f765090a PE |
270 | |
271 | #ifdef CONFIG_X86_32 | |
272 | early_ioremap_page_table_range_init(); | |
273 | ||
274 | load_cr3(swapper_pg_dir); | |
275 | #endif | |
276 | ||
f765090a PE |
277 | __flush_tlb_all(); |
278 | ||
279b706b SS |
279 | /* |
280 | * Reserve the kernel pagetable pages we used (pgt_buf_start - | |
281 | * pgt_buf_end) and free the other ones (pgt_buf_end - pgt_buf_top) | |
282 | * so that they can be reused for other purposes. | |
283 | * | |
24aa0788 TH |
284 | * On native it just means calling memblock_reserve, on Xen it also |
285 | * means marking RW the pagetable pages that we allocated before | |
279b706b SS |
286 | * but that haven't been used. |
287 | * | |
288 | * In fact on xen we mark RO the whole range pgt_buf_start - | |
289 | * pgt_buf_top, because we have to make sure that when | |
290 | * init_memory_mapping reaches the pagetable pages area, it maps | |
291 | * RO all the pagetable pages, including the ones that are beyond | |
292 | * pgt_buf_end at that time. | |
293 | */ | |
d1b19426 | 294 | if (!after_bootmem && pgt_buf_end > pgt_buf_start) |
279b706b SS |
295 | x86_init.mapping.pagetable_reserve(PFN_PHYS(pgt_buf_start), |
296 | PFN_PHYS(pgt_buf_end)); | |
f765090a PE |
297 | |
298 | if (!after_bootmem) | |
299 | early_memtest(start, end); | |
300 | ||
301 | return ret >> PAGE_SHIFT; | |
302 | } | |
303 | ||
e5b2bb55 | 304 | |
540aca06 PE |
305 | /* |
306 | * devmem_is_allowed() checks to see if /dev/mem access to a certain address | |
307 | * is valid. The argument is a physical page number. | |
308 | * | |
309 | * | |
310 | * On x86, access has to be given to the first megabyte of ram because that area | |
311 | * contains bios code and data regions used by X and dosemu and similar apps. | |
312 | * Access has to be given to non-kernel-ram areas as well, these contain the PCI | |
313 | * mmio resources as well as potential bios/acpi data regions. | |
314 | */ | |
315 | int devmem_is_allowed(unsigned long pagenr) | |
316 | { | |
317 | if (pagenr <= 256) | |
318 | return 1; | |
319 | if (iomem_is_exclusive(pagenr << PAGE_SHIFT)) | |
320 | return 0; | |
321 | if (!page_is_ram(pagenr)) | |
322 | return 1; | |
323 | return 0; | |
324 | } | |
325 | ||
e5b2bb55 PE |
326 | void free_init_pages(char *what, unsigned long begin, unsigned long end) |
327 | { | |
c967da6a YL |
328 | unsigned long addr; |
329 | unsigned long begin_aligned, end_aligned; | |
e5b2bb55 | 330 | |
c967da6a YL |
331 | /* Make sure boundaries are page aligned */ |
332 | begin_aligned = PAGE_ALIGN(begin); | |
333 | end_aligned = end & PAGE_MASK; | |
334 | ||
335 | if (WARN_ON(begin_aligned != begin || end_aligned != end)) { | |
336 | begin = begin_aligned; | |
337 | end = end_aligned; | |
338 | } | |
339 | ||
340 | if (begin >= end) | |
e5b2bb55 PE |
341 | return; |
342 | ||
c967da6a YL |
343 | addr = begin; |
344 | ||
e5b2bb55 PE |
345 | /* |
346 | * If debugging page accesses then do not free this memory but | |
347 | * mark them not present - any buggy init-section access will | |
348 | * create a kernel page fault: | |
349 | */ | |
350 | #ifdef CONFIG_DEBUG_PAGEALLOC | |
351 | printk(KERN_INFO "debug: unmapping init memory %08lx..%08lx\n", | |
c967da6a | 352 | begin, end); |
e5b2bb55 PE |
353 | set_memory_np(begin, (end - begin) >> PAGE_SHIFT); |
354 | #else | |
355 | /* | |
356 | * We just marked the kernel text read only above, now that | |
357 | * we are going to free part of that, we need to make that | |
5bd5a452 | 358 | * writeable and non-executable first. |
e5b2bb55 | 359 | */ |
5bd5a452 | 360 | set_memory_nx(begin, (end - begin) >> PAGE_SHIFT); |
e5b2bb55 PE |
361 | set_memory_rw(begin, (end - begin) >> PAGE_SHIFT); |
362 | ||
363 | printk(KERN_INFO "Freeing %s: %luk freed\n", what, (end - begin) >> 10); | |
364 | ||
365 | for (; addr < end; addr += PAGE_SIZE) { | |
366 | ClearPageReserved(virt_to_page(addr)); | |
367 | init_page_count(virt_to_page(addr)); | |
c967da6a | 368 | memset((void *)addr, POISON_FREE_INITMEM, PAGE_SIZE); |
e5b2bb55 PE |
369 | free_page(addr); |
370 | totalram_pages++; | |
371 | } | |
372 | #endif | |
373 | } | |
374 | ||
375 | void free_initmem(void) | |
376 | { | |
377 | free_init_pages("unused kernel memory", | |
378 | (unsigned long)(&__init_begin), | |
379 | (unsigned long)(&__init_end)); | |
380 | } | |
731ddea6 PE |
381 | |
382 | #ifdef CONFIG_BLK_DEV_INITRD | |
383 | void free_initrd_mem(unsigned long start, unsigned long end) | |
384 | { | |
c967da6a YL |
385 | /* |
386 | * end could be not aligned, and We can not align that, | |
387 | * decompresser could be confused by aligned initrd_end | |
388 | * We already reserve the end partial page before in | |
389 | * - i386_start_kernel() | |
390 | * - x86_64_start_kernel() | |
391 | * - relocate_initrd() | |
392 | * So here We can do PAGE_ALIGN() safely to get partial page to be freed | |
393 | */ | |
394 | free_init_pages("initrd memory", start, PAGE_ALIGN(end)); | |
731ddea6 PE |
395 | } |
396 | #endif | |
17623915 PE |
397 | |
398 | void __init zone_sizes_init(void) | |
399 | { | |
400 | unsigned long max_zone_pfns[MAX_NR_ZONES]; | |
401 | ||
402 | memset(max_zone_pfns, 0, sizeof(max_zone_pfns)); | |
403 | ||
404 | #ifdef CONFIG_ZONE_DMA | |
405 | max_zone_pfns[ZONE_DMA] = MAX_DMA_PFN; | |
406 | #endif | |
407 | #ifdef CONFIG_ZONE_DMA32 | |
408 | max_zone_pfns[ZONE_DMA32] = MAX_DMA32_PFN; | |
409 | #endif | |
410 | max_zone_pfns[ZONE_NORMAL] = max_low_pfn; | |
411 | #ifdef CONFIG_HIGHMEM | |
412 | max_zone_pfns[ZONE_HIGHMEM] = max_pfn; | |
413 | #endif | |
414 | ||
415 | free_area_init_nodes(max_zone_pfns); | |
416 | } | |
417 |