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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> |
540aca06 | 6 | |
e5b2bb55 | 7 | #include <asm/cacheflush.h> |
f765090a | 8 | #include <asm/e820.h> |
4fcb2083 | 9 | #include <asm/init.h> |
e5b2bb55 | 10 | #include <asm/page.h> |
540aca06 | 11 | #include <asm/page_types.h> |
e5b2bb55 | 12 | #include <asm/sections.h> |
49834396 | 13 | #include <asm/setup.h> |
e5b2bb55 | 14 | #include <asm/system.h> |
f765090a | 15 | #include <asm/tlbflush.h> |
9518e0e4 | 16 | #include <asm/tlb.h> |
76c06927 | 17 | #include <asm/proto.h> |
9518e0e4 PE |
18 | |
19 | DEFINE_PER_CPU(struct mmu_gather, mmu_gathers); | |
f765090a | 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 | |
4b239f45 | 69 | good_end = max_pfn_mapped << PAGE_SHIFT; |
f765090a | 70 | #endif |
1411e0ec | 71 | |
4b239f45 | 72 | base = memblock_find_in_range(start, good_end, tables, PAGE_SIZE); |
a9ce6bc1 | 73 | if (base == MEMBLOCK_ERROR) |
f765090a PE |
74 | panic("Cannot find space for the kernel page tables"); |
75 | ||
d1b19426 YL |
76 | pgt_buf_start = base >> PAGE_SHIFT; |
77 | pgt_buf_end = pgt_buf_start; | |
78 | pgt_buf_top = pgt_buf_start + (tables >> PAGE_SHIFT); | |
f765090a PE |
79 | |
80 | printk(KERN_DEBUG "kernel direct mapping tables up to %lx @ %lx-%lx\n", | |
d1b19426 | 81 | end, pgt_buf_start << PAGE_SHIFT, pgt_buf_top << PAGE_SHIFT); |
f765090a PE |
82 | } |
83 | ||
84 | struct map_range { | |
85 | unsigned long start; | |
86 | unsigned long end; | |
87 | unsigned page_size_mask; | |
88 | }; | |
89 | ||
90 | #ifdef CONFIG_X86_32 | |
91 | #define NR_RANGE_MR 3 | |
92 | #else /* CONFIG_X86_64 */ | |
93 | #define NR_RANGE_MR 5 | |
94 | #endif | |
95 | ||
dc9dd5cc JB |
96 | static int __meminit save_mr(struct map_range *mr, int nr_range, |
97 | unsigned long start_pfn, unsigned long end_pfn, | |
98 | unsigned long page_size_mask) | |
f765090a PE |
99 | { |
100 | if (start_pfn < end_pfn) { | |
101 | if (nr_range >= NR_RANGE_MR) | |
102 | panic("run out of range for init_memory_mapping\n"); | |
103 | mr[nr_range].start = start_pfn<<PAGE_SHIFT; | |
104 | mr[nr_range].end = end_pfn<<PAGE_SHIFT; | |
105 | mr[nr_range].page_size_mask = page_size_mask; | |
106 | nr_range++; | |
107 | } | |
108 | ||
109 | return nr_range; | |
110 | } | |
111 | ||
f765090a PE |
112 | /* |
113 | * Setup the direct mapping of the physical memory at PAGE_OFFSET. | |
114 | * This runs before bootmem is initialized and gets pages directly from | |
115 | * the physical memory. To access them they are temporarily mapped. | |
116 | */ | |
117 | unsigned long __init_refok init_memory_mapping(unsigned long start, | |
118 | unsigned long end) | |
119 | { | |
120 | unsigned long page_size_mask = 0; | |
121 | unsigned long start_pfn, end_pfn; | |
c77a3b59 | 122 | unsigned long ret = 0; |
f765090a | 123 | unsigned long pos; |
f765090a PE |
124 | |
125 | struct map_range mr[NR_RANGE_MR]; | |
126 | int nr_range, i; | |
127 | int use_pse, use_gbpages; | |
128 | ||
129 | printk(KERN_INFO "init_memory_mapping: %016lx-%016lx\n", start, end); | |
130 | ||
f8561296 | 131 | #if defined(CONFIG_DEBUG_PAGEALLOC) || defined(CONFIG_KMEMCHECK) |
f765090a PE |
132 | /* |
133 | * For CONFIG_DEBUG_PAGEALLOC, identity mapping will use small pages. | |
134 | * This will simplify cpa(), which otherwise needs to support splitting | |
135 | * large pages into small in interrupt context, etc. | |
136 | */ | |
137 | use_pse = use_gbpages = 0; | |
138 | #else | |
139 | use_pse = cpu_has_pse; | |
140 | use_gbpages = direct_gbpages; | |
141 | #endif | |
142 | ||
f765090a PE |
143 | /* Enable PSE if available */ |
144 | if (cpu_has_pse) | |
145 | set_in_cr4(X86_CR4_PSE); | |
146 | ||
147 | /* Enable PGE if available */ | |
148 | if (cpu_has_pge) { | |
149 | set_in_cr4(X86_CR4_PGE); | |
150 | __supported_pte_mask |= _PAGE_GLOBAL; | |
151 | } | |
f765090a PE |
152 | |
153 | if (use_gbpages) | |
154 | page_size_mask |= 1 << PG_LEVEL_1G; | |
155 | if (use_pse) | |
156 | page_size_mask |= 1 << PG_LEVEL_2M; | |
157 | ||
158 | memset(mr, 0, sizeof(mr)); | |
159 | nr_range = 0; | |
160 | ||
161 | /* head if not big page alignment ? */ | |
162 | start_pfn = start >> PAGE_SHIFT; | |
163 | pos = start_pfn << PAGE_SHIFT; | |
164 | #ifdef CONFIG_X86_32 | |
165 | /* | |
166 | * Don't use a large page for the first 2/4MB of memory | |
167 | * because there are often fixed size MTRRs in there | |
168 | * and overlapping MTRRs into large pages can cause | |
169 | * slowdowns. | |
170 | */ | |
171 | if (pos == 0) | |
172 | end_pfn = 1<<(PMD_SHIFT - PAGE_SHIFT); | |
173 | else | |
174 | end_pfn = ((pos + (PMD_SIZE - 1))>>PMD_SHIFT) | |
175 | << (PMD_SHIFT - PAGE_SHIFT); | |
176 | #else /* CONFIG_X86_64 */ | |
177 | end_pfn = ((pos + (PMD_SIZE - 1)) >> PMD_SHIFT) | |
178 | << (PMD_SHIFT - PAGE_SHIFT); | |
179 | #endif | |
180 | if (end_pfn > (end >> PAGE_SHIFT)) | |
181 | end_pfn = end >> PAGE_SHIFT; | |
182 | if (start_pfn < end_pfn) { | |
183 | nr_range = save_mr(mr, nr_range, start_pfn, end_pfn, 0); | |
184 | pos = end_pfn << PAGE_SHIFT; | |
185 | } | |
186 | ||
187 | /* big page (2M) range */ | |
188 | start_pfn = ((pos + (PMD_SIZE - 1))>>PMD_SHIFT) | |
189 | << (PMD_SHIFT - PAGE_SHIFT); | |
190 | #ifdef CONFIG_X86_32 | |
191 | end_pfn = (end>>PMD_SHIFT) << (PMD_SHIFT - PAGE_SHIFT); | |
192 | #else /* CONFIG_X86_64 */ | |
193 | end_pfn = ((pos + (PUD_SIZE - 1))>>PUD_SHIFT) | |
194 | << (PUD_SHIFT - PAGE_SHIFT); | |
195 | if (end_pfn > ((end>>PMD_SHIFT)<<(PMD_SHIFT - PAGE_SHIFT))) | |
196 | end_pfn = ((end>>PMD_SHIFT)<<(PMD_SHIFT - PAGE_SHIFT)); | |
197 | #endif | |
198 | ||
199 | if (start_pfn < end_pfn) { | |
200 | nr_range = save_mr(mr, nr_range, start_pfn, end_pfn, | |
201 | page_size_mask & (1<<PG_LEVEL_2M)); | |
202 | pos = end_pfn << PAGE_SHIFT; | |
203 | } | |
204 | ||
205 | #ifdef CONFIG_X86_64 | |
206 | /* big page (1G) range */ | |
207 | start_pfn = ((pos + (PUD_SIZE - 1))>>PUD_SHIFT) | |
208 | << (PUD_SHIFT - PAGE_SHIFT); | |
209 | end_pfn = (end >> PUD_SHIFT) << (PUD_SHIFT - PAGE_SHIFT); | |
210 | if (start_pfn < end_pfn) { | |
211 | nr_range = save_mr(mr, nr_range, start_pfn, end_pfn, | |
212 | page_size_mask & | |
213 | ((1<<PG_LEVEL_2M)|(1<<PG_LEVEL_1G))); | |
214 | pos = end_pfn << PAGE_SHIFT; | |
215 | } | |
216 | ||
217 | /* tail is not big page (1G) alignment */ | |
218 | start_pfn = ((pos + (PMD_SIZE - 1))>>PMD_SHIFT) | |
219 | << (PMD_SHIFT - PAGE_SHIFT); | |
220 | end_pfn = (end >> PMD_SHIFT) << (PMD_SHIFT - PAGE_SHIFT); | |
221 | if (start_pfn < end_pfn) { | |
222 | nr_range = save_mr(mr, nr_range, start_pfn, end_pfn, | |
223 | page_size_mask & (1<<PG_LEVEL_2M)); | |
224 | pos = end_pfn << PAGE_SHIFT; | |
225 | } | |
226 | #endif | |
227 | ||
228 | /* tail is not big page (2M) alignment */ | |
229 | start_pfn = pos>>PAGE_SHIFT; | |
230 | end_pfn = end>>PAGE_SHIFT; | |
231 | nr_range = save_mr(mr, nr_range, start_pfn, end_pfn, 0); | |
232 | ||
233 | /* try to merge same page size and continuous */ | |
234 | for (i = 0; nr_range > 1 && i < nr_range - 1; i++) { | |
235 | unsigned long old_start; | |
236 | if (mr[i].end != mr[i+1].start || | |
237 | mr[i].page_size_mask != mr[i+1].page_size_mask) | |
238 | continue; | |
239 | /* move it */ | |
240 | old_start = mr[i].start; | |
241 | memmove(&mr[i], &mr[i+1], | |
242 | (nr_range - 1 - i) * sizeof(struct map_range)); | |
243 | mr[i--].start = old_start; | |
244 | nr_range--; | |
245 | } | |
246 | ||
247 | for (i = 0; i < nr_range; i++) | |
248 | printk(KERN_DEBUG " %010lx - %010lx page %s\n", | |
249 | mr[i].start, mr[i].end, | |
250 | (mr[i].page_size_mask & (1<<PG_LEVEL_1G))?"1G":( | |
251 | (mr[i].page_size_mask & (1<<PG_LEVEL_2M))?"2M":"4k")); | |
252 | ||
253 | /* | |
254 | * Find space for the kernel direct mapping tables. | |
255 | * | |
256 | * Later we should allocate these tables in the local node of the | |
257 | * memory mapped. Unfortunately this is done currently before the | |
258 | * nodes are discovered. | |
259 | */ | |
260 | if (!after_bootmem) | |
261 | find_early_table_space(end, use_pse, use_gbpages); | |
262 | ||
f765090a PE |
263 | for (i = 0; i < nr_range; i++) |
264 | ret = kernel_physical_mapping_init(mr[i].start, mr[i].end, | |
265 | mr[i].page_size_mask); | |
f765090a PE |
266 | |
267 | #ifdef CONFIG_X86_32 | |
268 | early_ioremap_page_table_range_init(); | |
269 | ||
270 | load_cr3(swapper_pg_dir); | |
271 | #endif | |
272 | ||
f765090a PE |
273 | __flush_tlb_all(); |
274 | ||
d1b19426 YL |
275 | if (!after_bootmem && pgt_buf_end > pgt_buf_start) |
276 | memblock_x86_reserve_range(pgt_buf_start << PAGE_SHIFT, | |
277 | pgt_buf_end << PAGE_SHIFT, "PGTABLE"); | |
f765090a PE |
278 | |
279 | if (!after_bootmem) | |
280 | early_memtest(start, end); | |
281 | ||
282 | return ret >> PAGE_SHIFT; | |
283 | } | |
284 | ||
e5b2bb55 | 285 | |
540aca06 PE |
286 | /* |
287 | * devmem_is_allowed() checks to see if /dev/mem access to a certain address | |
288 | * is valid. The argument is a physical page number. | |
289 | * | |
290 | * | |
291 | * On x86, access has to be given to the first megabyte of ram because that area | |
292 | * contains bios code and data regions used by X and dosemu and similar apps. | |
293 | * Access has to be given to non-kernel-ram areas as well, these contain the PCI | |
294 | * mmio resources as well as potential bios/acpi data regions. | |
295 | */ | |
296 | int devmem_is_allowed(unsigned long pagenr) | |
297 | { | |
298 | if (pagenr <= 256) | |
299 | return 1; | |
300 | if (iomem_is_exclusive(pagenr << PAGE_SHIFT)) | |
301 | return 0; | |
302 | if (!page_is_ram(pagenr)) | |
303 | return 1; | |
304 | return 0; | |
305 | } | |
306 | ||
e5b2bb55 PE |
307 | void free_init_pages(char *what, unsigned long begin, unsigned long end) |
308 | { | |
c967da6a YL |
309 | unsigned long addr; |
310 | unsigned long begin_aligned, end_aligned; | |
e5b2bb55 | 311 | |
c967da6a YL |
312 | /* Make sure boundaries are page aligned */ |
313 | begin_aligned = PAGE_ALIGN(begin); | |
314 | end_aligned = end & PAGE_MASK; | |
315 | ||
316 | if (WARN_ON(begin_aligned != begin || end_aligned != end)) { | |
317 | begin = begin_aligned; | |
318 | end = end_aligned; | |
319 | } | |
320 | ||
321 | if (begin >= end) | |
e5b2bb55 PE |
322 | return; |
323 | ||
c967da6a YL |
324 | addr = begin; |
325 | ||
e5b2bb55 PE |
326 | /* |
327 | * If debugging page accesses then do not free this memory but | |
328 | * mark them not present - any buggy init-section access will | |
329 | * create a kernel page fault: | |
330 | */ | |
331 | #ifdef CONFIG_DEBUG_PAGEALLOC | |
332 | printk(KERN_INFO "debug: unmapping init memory %08lx..%08lx\n", | |
c967da6a | 333 | begin, end); |
e5b2bb55 PE |
334 | set_memory_np(begin, (end - begin) >> PAGE_SHIFT); |
335 | #else | |
336 | /* | |
337 | * We just marked the kernel text read only above, now that | |
338 | * we are going to free part of that, we need to make that | |
5bd5a452 | 339 | * writeable and non-executable first. |
e5b2bb55 | 340 | */ |
5bd5a452 | 341 | set_memory_nx(begin, (end - begin) >> PAGE_SHIFT); |
e5b2bb55 PE |
342 | set_memory_rw(begin, (end - begin) >> PAGE_SHIFT); |
343 | ||
344 | printk(KERN_INFO "Freeing %s: %luk freed\n", what, (end - begin) >> 10); | |
345 | ||
346 | for (; addr < end; addr += PAGE_SIZE) { | |
347 | ClearPageReserved(virt_to_page(addr)); | |
348 | init_page_count(virt_to_page(addr)); | |
c967da6a | 349 | memset((void *)addr, POISON_FREE_INITMEM, PAGE_SIZE); |
e5b2bb55 PE |
350 | free_page(addr); |
351 | totalram_pages++; | |
352 | } | |
353 | #endif | |
354 | } | |
355 | ||
356 | void free_initmem(void) | |
357 | { | |
358 | free_init_pages("unused kernel memory", | |
359 | (unsigned long)(&__init_begin), | |
360 | (unsigned long)(&__init_end)); | |
361 | } | |
731ddea6 PE |
362 | |
363 | #ifdef CONFIG_BLK_DEV_INITRD | |
364 | void free_initrd_mem(unsigned long start, unsigned long end) | |
365 | { | |
c967da6a YL |
366 | /* |
367 | * end could be not aligned, and We can not align that, | |
368 | * decompresser could be confused by aligned initrd_end | |
369 | * We already reserve the end partial page before in | |
370 | * - i386_start_kernel() | |
371 | * - x86_64_start_kernel() | |
372 | * - relocate_initrd() | |
373 | * So here We can do PAGE_ALIGN() safely to get partial page to be freed | |
374 | */ | |
375 | free_init_pages("initrd memory", start, PAGE_ALIGN(end)); | |
731ddea6 PE |
376 | } |
377 | #endif |