Commit | Line | Data |
---|---|---|
b79cd8f1 YL |
1 | /* |
2 | * Handle the memory map. | |
3 | * The functions here do the job until bootmem takes over. | |
4 | * | |
5 | * Getting sanitize_e820_map() in sync with i386 version by applying change: | |
6 | * - Provisions for empty E820 memory regions (reported by certain BIOSes). | |
7 | * Alex Achenbach <xela@slit.de>, December 2002. | |
8 | * Venkatesh Pallipadi <venkatesh.pallipadi@intel.com> | |
9 | * | |
10 | */ | |
11 | #include <linux/kernel.h> | |
12 | #include <linux/types.h> | |
13 | #include <linux/init.h> | |
93a72052 | 14 | #include <linux/crash_dump.h> |
69c60c88 | 15 | #include <linux/export.h> |
b79cd8f1 | 16 | #include <linux/bootmem.h> |
b79cd8f1 | 17 | #include <linux/pfn.h> |
bf62f398 | 18 | #include <linux/suspend.h> |
976513db | 19 | #include <linux/acpi.h> |
5dfcf14d | 20 | #include <linux/firmware-map.h> |
72d7c3b3 | 21 | #include <linux/memblock.h> |
b79cd8f1 | 22 | |
b79cd8f1 | 23 | #include <asm/e820.h> |
a4c81cf6 | 24 | #include <asm/proto.h> |
b79cd8f1 YL |
25 | #include <asm/setup.h> |
26 | ||
5dfcf14d BW |
27 | /* |
28 | * The e820 map is the map that gets modified e.g. with command line parameters | |
29 | * and that is also registered with modifications in the kernel resource tree | |
30 | * with the iomem_resource as parent. | |
31 | * | |
32 | * The e820_saved is directly saved after the BIOS-provided memory map is | |
33 | * copied. It doesn't get modified afterwards. It's registered for the | |
34 | * /sys/firmware/memmap interface. | |
35 | * | |
36 | * That memory map is not modified and is used as base for kexec. The kexec'd | |
37 | * kernel should get the same memory map as the firmware provides. Then the | |
38 | * user can e.g. boot the original kernel with mem=1G while still booting the | |
39 | * next kernel with full memory. | |
40 | */ | |
b79cd8f1 | 41 | struct e820map e820; |
5dfcf14d | 42 | struct e820map e820_saved; |
b79cd8f1 YL |
43 | |
44 | /* For PCI or other memory-mapped resources */ | |
45 | unsigned long pci_mem_start = 0xaeedbabe; | |
46 | #ifdef CONFIG_PCI | |
47 | EXPORT_SYMBOL(pci_mem_start); | |
48 | #endif | |
49 | ||
50 | /* | |
51 | * This function checks if any part of the range <start,end> is mapped | |
52 | * with type. | |
53 | */ | |
54 | int | |
55 | e820_any_mapped(u64 start, u64 end, unsigned type) | |
56 | { | |
57 | int i; | |
58 | ||
59 | for (i = 0; i < e820.nr_map; i++) { | |
60 | struct e820entry *ei = &e820.map[i]; | |
61 | ||
62 | if (type && ei->type != type) | |
63 | continue; | |
64 | if (ei->addr >= end || ei->addr + ei->size <= start) | |
65 | continue; | |
66 | return 1; | |
67 | } | |
68 | return 0; | |
69 | } | |
70 | EXPORT_SYMBOL_GPL(e820_any_mapped); | |
71 | ||
72 | /* | |
73 | * This function checks if the entire range <start,end> is mapped with type. | |
74 | * | |
75 | * Note: this function only works correct if the e820 table is sorted and | |
76 | * not-overlapping, which is the case | |
77 | */ | |
78 | int __init e820_all_mapped(u64 start, u64 end, unsigned type) | |
79 | { | |
80 | int i; | |
81 | ||
82 | for (i = 0; i < e820.nr_map; i++) { | |
83 | struct e820entry *ei = &e820.map[i]; | |
84 | ||
85 | if (type && ei->type != type) | |
86 | continue; | |
87 | /* is the region (part) in overlap with the current region ?*/ | |
88 | if (ei->addr >= end || ei->addr + ei->size <= start) | |
89 | continue; | |
90 | ||
91 | /* if the region is at the beginning of <start,end> we move | |
92 | * start to the end of the region since it's ok until there | |
93 | */ | |
94 | if (ei->addr <= start) | |
95 | start = ei->addr + ei->size; | |
96 | /* | |
97 | * if start is now at or beyond end, we're done, full | |
98 | * coverage | |
99 | */ | |
100 | if (start >= end) | |
101 | return 1; | |
102 | } | |
103 | return 0; | |
104 | } | |
105 | ||
106 | /* | |
107 | * Add a memory region to the kernel e820 map. | |
108 | */ | |
773e673d YL |
109 | static void __init __e820_add_region(struct e820map *e820x, u64 start, u64 size, |
110 | int type) | |
b79cd8f1 | 111 | { |
773e673d | 112 | int x = e820x->nr_map; |
b79cd8f1 | 113 | |
5051fd69 | 114 | if (x >= ARRAY_SIZE(e820x->map)) { |
b79cd8f1 YL |
115 | printk(KERN_ERR "Ooops! Too many entries in the memory map!\n"); |
116 | return; | |
117 | } | |
118 | ||
773e673d YL |
119 | e820x->map[x].addr = start; |
120 | e820x->map[x].size = size; | |
121 | e820x->map[x].type = type; | |
122 | e820x->nr_map++; | |
123 | } | |
124 | ||
125 | void __init e820_add_region(u64 start, u64 size, int type) | |
126 | { | |
127 | __e820_add_region(&e820, start, size, type); | |
b79cd8f1 YL |
128 | } |
129 | ||
c61cf4cf YL |
130 | static void __init e820_print_type(u32 type) |
131 | { | |
132 | switch (type) { | |
133 | case E820_RAM: | |
134 | case E820_RESERVED_KERN: | |
135 | printk(KERN_CONT "(usable)"); | |
136 | break; | |
137 | case E820_RESERVED: | |
138 | printk(KERN_CONT "(reserved)"); | |
139 | break; | |
140 | case E820_ACPI: | |
141 | printk(KERN_CONT "(ACPI data)"); | |
142 | break; | |
143 | case E820_NVS: | |
144 | printk(KERN_CONT "(ACPI NVS)"); | |
145 | break; | |
146 | case E820_UNUSABLE: | |
147 | printk(KERN_CONT "(unusable)"); | |
148 | break; | |
149 | default: | |
150 | printk(KERN_CONT "type %u", type); | |
151 | break; | |
152 | } | |
153 | } | |
154 | ||
b79cd8f1 YL |
155 | void __init e820_print_map(char *who) |
156 | { | |
157 | int i; | |
158 | ||
159 | for (i = 0; i < e820.nr_map; i++) { | |
160 | printk(KERN_INFO " %s: %016Lx - %016Lx ", who, | |
161 | (unsigned long long) e820.map[i].addr, | |
162 | (unsigned long long) | |
163 | (e820.map[i].addr + e820.map[i].size)); | |
c61cf4cf YL |
164 | e820_print_type(e820.map[i].type); |
165 | printk(KERN_CONT "\n"); | |
b79cd8f1 YL |
166 | } |
167 | } | |
168 | ||
169 | /* | |
170 | * Sanitize the BIOS e820 map. | |
171 | * | |
172 | * Some e820 responses include overlapping entries. The following | |
5b7eb2e9 PJ |
173 | * replaces the original e820 map with a new one, removing overlaps, |
174 | * and resolving conflicting memory types in favor of highest | |
175 | * numbered type. | |
b79cd8f1 | 176 | * |
5b7eb2e9 PJ |
177 | * The input parameter biosmap points to an array of 'struct |
178 | * e820entry' which on entry has elements in the range [0, *pnr_map) | |
179 | * valid, and which has space for up to max_nr_map entries. | |
180 | * On return, the resulting sanitized e820 map entries will be in | |
181 | * overwritten in the same location, starting at biosmap. | |
182 | * | |
183 | * The integer pointed to by pnr_map must be valid on entry (the | |
184 | * current number of valid entries located at biosmap) and will | |
185 | * be updated on return, with the new number of valid entries | |
186 | * (something no more than max_nr_map.) | |
187 | * | |
188 | * The return value from sanitize_e820_map() is zero if it | |
189 | * successfully 'sanitized' the map entries passed in, and is -1 | |
190 | * if it did nothing, which can happen if either of (1) it was | |
191 | * only passed one map entry, or (2) any of the input map entries | |
192 | * were invalid (start + size < start, meaning that the size was | |
193 | * so big the described memory range wrapped around through zero.) | |
194 | * | |
195 | * Visually we're performing the following | |
196 | * (1,2,3,4 = memory types)... | |
197 | * | |
198 | * Sample memory map (w/overlaps): | |
199 | * ____22__________________ | |
200 | * ______________________4_ | |
201 | * ____1111________________ | |
202 | * _44_____________________ | |
203 | * 11111111________________ | |
204 | * ____________________33__ | |
205 | * ___________44___________ | |
206 | * __________33333_________ | |
207 | * ______________22________ | |
208 | * ___________________2222_ | |
209 | * _________111111111______ | |
210 | * _____________________11_ | |
211 | * _________________4______ | |
212 | * | |
213 | * Sanitized equivalent (no overlap): | |
214 | * 1_______________________ | |
215 | * _44_____________________ | |
216 | * ___1____________________ | |
217 | * ____22__________________ | |
218 | * ______11________________ | |
219 | * _________1______________ | |
220 | * __________3_____________ | |
221 | * ___________44___________ | |
222 | * _____________33_________ | |
223 | * _______________2________ | |
224 | * ________________1_______ | |
225 | * _________________4______ | |
226 | * ___________________2____ | |
227 | * ____________________33__ | |
228 | * ______________________4_ | |
b79cd8f1 | 229 | */ |
5b7eb2e9 | 230 | |
c3965bd1 | 231 | int __init sanitize_e820_map(struct e820entry *biosmap, int max_nr_map, |
ba639039 | 232 | u32 *pnr_map) |
b79cd8f1 YL |
233 | { |
234 | struct change_member { | |
235 | struct e820entry *pbios; /* pointer to original bios entry */ | |
236 | unsigned long long addr; /* address for this change point */ | |
237 | }; | |
157fabf0 PJ |
238 | static struct change_member change_point_list[2*E820_X_MAX] __initdata; |
239 | static struct change_member *change_point[2*E820_X_MAX] __initdata; | |
240 | static struct e820entry *overlap_list[E820_X_MAX] __initdata; | |
241 | static struct e820entry new_bios[E820_X_MAX] __initdata; | |
b79cd8f1 YL |
242 | struct change_member *change_tmp; |
243 | unsigned long current_type, last_type; | |
244 | unsigned long long last_addr; | |
245 | int chgidx, still_changing; | |
246 | int overlap_entries; | |
247 | int new_bios_entry; | |
248 | int old_nr, new_nr, chg_nr; | |
249 | int i; | |
250 | ||
b79cd8f1 YL |
251 | /* if there's only one memory region, don't bother */ |
252 | if (*pnr_map < 2) | |
253 | return -1; | |
254 | ||
255 | old_nr = *pnr_map; | |
6e9bcc79 | 256 | BUG_ON(old_nr > max_nr_map); |
b79cd8f1 YL |
257 | |
258 | /* bail out if we find any unreasonable addresses in bios map */ | |
259 | for (i = 0; i < old_nr; i++) | |
260 | if (biosmap[i].addr + biosmap[i].size < biosmap[i].addr) | |
261 | return -1; | |
262 | ||
263 | /* create pointers for initial change-point information (for sorting) */ | |
264 | for (i = 0; i < 2 * old_nr; i++) | |
265 | change_point[i] = &change_point_list[i]; | |
266 | ||
267 | /* record all known change-points (starting and ending addresses), | |
268 | omitting those that are for empty memory regions */ | |
269 | chgidx = 0; | |
270 | for (i = 0; i < old_nr; i++) { | |
271 | if (biosmap[i].size != 0) { | |
272 | change_point[chgidx]->addr = biosmap[i].addr; | |
273 | change_point[chgidx++]->pbios = &biosmap[i]; | |
274 | change_point[chgidx]->addr = biosmap[i].addr + | |
275 | biosmap[i].size; | |
276 | change_point[chgidx++]->pbios = &biosmap[i]; | |
277 | } | |
278 | } | |
279 | chg_nr = chgidx; | |
280 | ||
281 | /* sort change-point list by memory addresses (low -> high) */ | |
282 | still_changing = 1; | |
283 | while (still_changing) { | |
284 | still_changing = 0; | |
285 | for (i = 1; i < chg_nr; i++) { | |
286 | unsigned long long curaddr, lastaddr; | |
287 | unsigned long long curpbaddr, lastpbaddr; | |
288 | ||
289 | curaddr = change_point[i]->addr; | |
290 | lastaddr = change_point[i - 1]->addr; | |
291 | curpbaddr = change_point[i]->pbios->addr; | |
292 | lastpbaddr = change_point[i - 1]->pbios->addr; | |
293 | ||
294 | /* | |
295 | * swap entries, when: | |
296 | * | |
297 | * curaddr > lastaddr or | |
298 | * curaddr == lastaddr and curaddr == curpbaddr and | |
299 | * lastaddr != lastpbaddr | |
300 | */ | |
301 | if (curaddr < lastaddr || | |
302 | (curaddr == lastaddr && curaddr == curpbaddr && | |
303 | lastaddr != lastpbaddr)) { | |
304 | change_tmp = change_point[i]; | |
305 | change_point[i] = change_point[i-1]; | |
306 | change_point[i-1] = change_tmp; | |
307 | still_changing = 1; | |
308 | } | |
309 | } | |
310 | } | |
311 | ||
312 | /* create a new bios memory map, removing overlaps */ | |
313 | overlap_entries = 0; /* number of entries in the overlap table */ | |
314 | new_bios_entry = 0; /* index for creating new bios map entries */ | |
315 | last_type = 0; /* start with undefined memory type */ | |
316 | last_addr = 0; /* start with 0 as last starting address */ | |
317 | ||
318 | /* loop through change-points, determining affect on the new bios map */ | |
319 | for (chgidx = 0; chgidx < chg_nr; chgidx++) { | |
320 | /* keep track of all overlapping bios entries */ | |
321 | if (change_point[chgidx]->addr == | |
322 | change_point[chgidx]->pbios->addr) { | |
323 | /* | |
324 | * add map entry to overlap list (> 1 entry | |
325 | * implies an overlap) | |
326 | */ | |
327 | overlap_list[overlap_entries++] = | |
328 | change_point[chgidx]->pbios; | |
329 | } else { | |
330 | /* | |
331 | * remove entry from list (order independent, | |
332 | * so swap with last) | |
333 | */ | |
334 | for (i = 0; i < overlap_entries; i++) { | |
335 | if (overlap_list[i] == | |
336 | change_point[chgidx]->pbios) | |
337 | overlap_list[i] = | |
338 | overlap_list[overlap_entries-1]; | |
339 | } | |
340 | overlap_entries--; | |
341 | } | |
342 | /* | |
343 | * if there are overlapping entries, decide which | |
344 | * "type" to use (larger value takes precedence -- | |
345 | * 1=usable, 2,3,4,4+=unusable) | |
346 | */ | |
347 | current_type = 0; | |
348 | for (i = 0; i < overlap_entries; i++) | |
349 | if (overlap_list[i]->type > current_type) | |
350 | current_type = overlap_list[i]->type; | |
351 | /* | |
352 | * continue building up new bios map based on this | |
353 | * information | |
354 | */ | |
355 | if (current_type != last_type) { | |
356 | if (last_type != 0) { | |
357 | new_bios[new_bios_entry].size = | |
358 | change_point[chgidx]->addr - last_addr; | |
359 | /* | |
360 | * move forward only if the new size | |
361 | * was non-zero | |
362 | */ | |
363 | if (new_bios[new_bios_entry].size != 0) | |
364 | /* | |
365 | * no more space left for new | |
366 | * bios entries ? | |
367 | */ | |
c3965bd1 | 368 | if (++new_bios_entry >= max_nr_map) |
b79cd8f1 YL |
369 | break; |
370 | } | |
371 | if (current_type != 0) { | |
372 | new_bios[new_bios_entry].addr = | |
373 | change_point[chgidx]->addr; | |
374 | new_bios[new_bios_entry].type = current_type; | |
375 | last_addr = change_point[chgidx]->addr; | |
376 | } | |
377 | last_type = current_type; | |
378 | } | |
379 | } | |
380 | /* retain count for new bios entries */ | |
381 | new_nr = new_bios_entry; | |
382 | ||
383 | /* copy new bios mapping into original location */ | |
384 | memcpy(biosmap, new_bios, new_nr * sizeof(struct e820entry)); | |
385 | *pnr_map = new_nr; | |
386 | ||
387 | return 0; | |
388 | } | |
389 | ||
dc8e8120 | 390 | static int __init __append_e820_map(struct e820entry *biosmap, int nr_map) |
8c5beb50 HY |
391 | { |
392 | while (nr_map) { | |
393 | u64 start = biosmap->addr; | |
394 | u64 size = biosmap->size; | |
395 | u64 end = start + size; | |
396 | u32 type = biosmap->type; | |
397 | ||
398 | /* Overflow in 64 bits? Ignore the memory map. */ | |
399 | if (start > end) | |
400 | return -1; | |
401 | ||
402 | e820_add_region(start, size, type); | |
403 | ||
404 | biosmap++; | |
405 | nr_map--; | |
406 | } | |
407 | return 0; | |
408 | } | |
409 | ||
b79cd8f1 YL |
410 | /* |
411 | * Copy the BIOS e820 map into a safe place. | |
412 | * | |
413 | * Sanity-check it while we're at it.. | |
414 | * | |
415 | * If we're lucky and live on a modern system, the setup code | |
416 | * will have given us a memory map that we can use to properly | |
417 | * set up memory. If we aren't, we'll fake a memory map. | |
418 | */ | |
dc8e8120 | 419 | static int __init append_e820_map(struct e820entry *biosmap, int nr_map) |
b79cd8f1 YL |
420 | { |
421 | /* Only one memory region (or negative)? Ignore it */ | |
422 | if (nr_map < 2) | |
423 | return -1; | |
424 | ||
dc8e8120 | 425 | return __append_e820_map(biosmap, nr_map); |
b79cd8f1 YL |
426 | } |
427 | ||
773e673d | 428 | static u64 __init __e820_update_range(struct e820map *e820x, u64 start, |
fc9036ea YL |
429 | u64 size, unsigned old_type, |
430 | unsigned new_type) | |
b79cd8f1 | 431 | { |
78a8b35b | 432 | u64 end; |
773e673d | 433 | unsigned int i; |
b79cd8f1 YL |
434 | u64 real_updated_size = 0; |
435 | ||
436 | BUG_ON(old_type == new_type); | |
437 | ||
232b957a YL |
438 | if (size > (ULLONG_MAX - start)) |
439 | size = ULLONG_MAX - start; | |
440 | ||
78a8b35b | 441 | end = start + size; |
c61cf4cf YL |
442 | printk(KERN_DEBUG "e820 update range: %016Lx - %016Lx ", |
443 | (unsigned long long) start, | |
444 | (unsigned long long) end); | |
445 | e820_print_type(old_type); | |
446 | printk(KERN_CONT " ==> "); | |
447 | e820_print_type(new_type); | |
448 | printk(KERN_CONT "\n"); | |
449 | ||
5c0e6f03 | 450 | for (i = 0; i < e820x->nr_map; i++) { |
fc9036ea | 451 | struct e820entry *ei = &e820x->map[i]; |
b79cd8f1 | 452 | u64 final_start, final_end; |
78a8b35b YL |
453 | u64 ei_end; |
454 | ||
b79cd8f1 YL |
455 | if (ei->type != old_type) |
456 | continue; | |
78a8b35b YL |
457 | |
458 | ei_end = ei->addr + ei->size; | |
459 | /* totally covered by new range? */ | |
460 | if (ei->addr >= start && ei_end <= end) { | |
b79cd8f1 YL |
461 | ei->type = new_type; |
462 | real_updated_size += ei->size; | |
463 | continue; | |
464 | } | |
78a8b35b YL |
465 | |
466 | /* new range is totally covered? */ | |
467 | if (ei->addr < start && ei_end > end) { | |
468 | __e820_add_region(e820x, start, size, new_type); | |
469 | __e820_add_region(e820x, end, ei_end - end, ei->type); | |
470 | ei->size = start - ei->addr; | |
471 | real_updated_size += size; | |
472 | continue; | |
473 | } | |
474 | ||
b79cd8f1 YL |
475 | /* partially covered */ |
476 | final_start = max(start, ei->addr); | |
78a8b35b | 477 | final_end = min(end, ei_end); |
b79cd8f1 YL |
478 | if (final_start >= final_end) |
479 | continue; | |
5c0e6f03 | 480 | |
773e673d YL |
481 | __e820_add_region(e820x, final_start, final_end - final_start, |
482 | new_type); | |
5c0e6f03 | 483 | |
b79cd8f1 | 484 | real_updated_size += final_end - final_start; |
976dd4dc | 485 | |
773e673d YL |
486 | /* |
487 | * left range could be head or tail, so need to update | |
488 | * size at first. | |
489 | */ | |
490 | ei->size -= final_end - final_start; | |
976dd4dc YL |
491 | if (ei->addr < final_start) |
492 | continue; | |
493 | ei->addr = final_end; | |
b79cd8f1 YL |
494 | } |
495 | return real_updated_size; | |
496 | } | |
497 | ||
fc9036ea YL |
498 | u64 __init e820_update_range(u64 start, u64 size, unsigned old_type, |
499 | unsigned new_type) | |
500 | { | |
773e673d | 501 | return __e820_update_range(&e820, start, size, old_type, new_type); |
fc9036ea YL |
502 | } |
503 | ||
504 | static u64 __init e820_update_range_saved(u64 start, u64 size, | |
505 | unsigned old_type, unsigned new_type) | |
506 | { | |
773e673d | 507 | return __e820_update_range(&e820_saved, start, size, old_type, |
fc9036ea YL |
508 | new_type); |
509 | } | |
510 | ||
7a1fd986 YL |
511 | /* make e820 not cover the range */ |
512 | u64 __init e820_remove_range(u64 start, u64 size, unsigned old_type, | |
513 | int checktype) | |
514 | { | |
515 | int i; | |
1b5576e6 | 516 | u64 end; |
7a1fd986 YL |
517 | u64 real_removed_size = 0; |
518 | ||
232b957a YL |
519 | if (size > (ULLONG_MAX - start)) |
520 | size = ULLONG_MAX - start; | |
521 | ||
1b5576e6 YL |
522 | end = start + size; |
523 | printk(KERN_DEBUG "e820 remove range: %016Lx - %016Lx ", | |
524 | (unsigned long long) start, | |
525 | (unsigned long long) end); | |
9f3a5f52 YL |
526 | if (checktype) |
527 | e820_print_type(old_type); | |
1b5576e6 YL |
528 | printk(KERN_CONT "\n"); |
529 | ||
7a1fd986 YL |
530 | for (i = 0; i < e820.nr_map; i++) { |
531 | struct e820entry *ei = &e820.map[i]; | |
532 | u64 final_start, final_end; | |
9f3a5f52 | 533 | u64 ei_end; |
7a1fd986 YL |
534 | |
535 | if (checktype && ei->type != old_type) | |
536 | continue; | |
9f3a5f52 YL |
537 | |
538 | ei_end = ei->addr + ei->size; | |
7a1fd986 | 539 | /* totally covered? */ |
9f3a5f52 | 540 | if (ei->addr >= start && ei_end <= end) { |
7a1fd986 YL |
541 | real_removed_size += ei->size; |
542 | memset(ei, 0, sizeof(struct e820entry)); | |
543 | continue; | |
544 | } | |
9f3a5f52 YL |
545 | |
546 | /* new range is totally covered? */ | |
547 | if (ei->addr < start && ei_end > end) { | |
548 | e820_add_region(end, ei_end - end, ei->type); | |
549 | ei->size = start - ei->addr; | |
550 | real_removed_size += size; | |
551 | continue; | |
552 | } | |
553 | ||
7a1fd986 YL |
554 | /* partially covered */ |
555 | final_start = max(start, ei->addr); | |
9f3a5f52 | 556 | final_end = min(end, ei_end); |
7a1fd986 YL |
557 | if (final_start >= final_end) |
558 | continue; | |
559 | real_removed_size += final_end - final_start; | |
560 | ||
9f3a5f52 YL |
561 | /* |
562 | * left range could be head or tail, so need to update | |
563 | * size at first. | |
564 | */ | |
7a1fd986 YL |
565 | ei->size -= final_end - final_start; |
566 | if (ei->addr < final_start) | |
567 | continue; | |
568 | ei->addr = final_end; | |
569 | } | |
570 | return real_removed_size; | |
571 | } | |
572 | ||
b79cd8f1 YL |
573 | void __init update_e820(void) |
574 | { | |
ba639039 | 575 | u32 nr_map; |
b79cd8f1 YL |
576 | |
577 | nr_map = e820.nr_map; | |
c3965bd1 | 578 | if (sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &nr_map)) |
b79cd8f1 YL |
579 | return; |
580 | e820.nr_map = nr_map; | |
581 | printk(KERN_INFO "modified physical RAM map:\n"); | |
582 | e820_print_map("modified"); | |
583 | } | |
fc9036ea YL |
584 | static void __init update_e820_saved(void) |
585 | { | |
ba639039 | 586 | u32 nr_map; |
fc9036ea YL |
587 | |
588 | nr_map = e820_saved.nr_map; | |
589 | if (sanitize_e820_map(e820_saved.map, ARRAY_SIZE(e820_saved.map), &nr_map)) | |
590 | return; | |
591 | e820_saved.nr_map = nr_map; | |
592 | } | |
fd6493e1 | 593 | #define MAX_GAP_END 0x100000000ull |
b79cd8f1 | 594 | /* |
fd6493e1 | 595 | * Search for a gap in the e820 memory space from start_addr to end_addr. |
b79cd8f1 | 596 | */ |
3381959d | 597 | __init int e820_search_gap(unsigned long *gapstart, unsigned long *gapsize, |
fd6493e1 | 598 | unsigned long start_addr, unsigned long long end_addr) |
b79cd8f1 | 599 | { |
fd6493e1 | 600 | unsigned long long last; |
3381959d | 601 | int i = e820.nr_map; |
b79cd8f1 YL |
602 | int found = 0; |
603 | ||
fd6493e1 AK |
604 | last = (end_addr && end_addr < MAX_GAP_END) ? end_addr : MAX_GAP_END; |
605 | ||
b79cd8f1 YL |
606 | while (--i >= 0) { |
607 | unsigned long long start = e820.map[i].addr; | |
608 | unsigned long long end = start + e820.map[i].size; | |
609 | ||
3381959d AK |
610 | if (end < start_addr) |
611 | continue; | |
612 | ||
b79cd8f1 YL |
613 | /* |
614 | * Since "last" is at most 4GB, we know we'll | |
615 | * fit in 32 bits if this condition is true | |
616 | */ | |
617 | if (last > end) { | |
618 | unsigned long gap = last - end; | |
619 | ||
3381959d AK |
620 | if (gap >= *gapsize) { |
621 | *gapsize = gap; | |
622 | *gapstart = end; | |
b79cd8f1 YL |
623 | found = 1; |
624 | } | |
625 | } | |
626 | if (start < last) | |
627 | last = start; | |
628 | } | |
3381959d AK |
629 | return found; |
630 | } | |
631 | ||
632 | /* | |
633 | * Search for the biggest gap in the low 32 bits of the e820 | |
634 | * memory space. We pass this space to PCI to assign MMIO resources | |
635 | * for hotplug or unconfigured devices in. | |
636 | * Hopefully the BIOS let enough space left. | |
637 | */ | |
638 | __init void e820_setup_gap(void) | |
639 | { | |
5d423ccd | 640 | unsigned long gapstart, gapsize; |
3381959d AK |
641 | int found; |
642 | ||
643 | gapstart = 0x10000000; | |
644 | gapsize = 0x400000; | |
fd6493e1 | 645 | found = e820_search_gap(&gapstart, &gapsize, 0, MAX_GAP_END); |
b79cd8f1 YL |
646 | |
647 | #ifdef CONFIG_X86_64 | |
648 | if (!found) { | |
c987d12f | 649 | gapstart = (max_pfn << PAGE_SHIFT) + 1024*1024; |
ad361c98 JP |
650 | printk(KERN_ERR |
651 | "PCI: Warning: Cannot find a gap in the 32bit address range\n" | |
652 | "PCI: Unassigned devices with 32bit resource registers may break!\n"); | |
b79cd8f1 YL |
653 | } |
654 | #endif | |
655 | ||
656 | /* | |
5d423ccd | 657 | * e820_reserve_resources_late protect stolen RAM already |
b79cd8f1 | 658 | */ |
5d423ccd | 659 | pci_mem_start = gapstart; |
b79cd8f1 YL |
660 | |
661 | printk(KERN_INFO | |
662 | "Allocating PCI resources starting at %lx (gap: %lx:%lx)\n", | |
663 | pci_mem_start, gapstart, gapsize); | |
664 | } | |
665 | ||
8c5beb50 HY |
666 | /** |
667 | * Because of the size limitation of struct boot_params, only first | |
668 | * 128 E820 memory entries are passed to kernel via | |
669 | * boot_params.e820_map, others are passed via SETUP_E820_EXT node of | |
670 | * linked list of struct setup_data, which is parsed here. | |
671 | */ | |
f1c2b357 | 672 | void __init parse_e820_ext(struct setup_data *sdata) |
8c5beb50 | 673 | { |
8c5beb50 HY |
674 | int entries; |
675 | struct e820entry *extmap; | |
676 | ||
677 | entries = sdata->len / sizeof(struct e820entry); | |
8c5beb50 | 678 | extmap = (struct e820entry *)(sdata->data); |
dc8e8120 | 679 | __append_e820_map(extmap, entries); |
8c5beb50 | 680 | sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map); |
8c5beb50 HY |
681 | printk(KERN_INFO "extended physical RAM map:\n"); |
682 | e820_print_map("extended"); | |
683 | } | |
684 | ||
bf62f398 YL |
685 | #if defined(CONFIG_X86_64) || \ |
686 | (defined(CONFIG_X86_32) && defined(CONFIG_HIBERNATION)) | |
687 | /** | |
688 | * Find the ranges of physical addresses that do not correspond to | |
689 | * e820 RAM areas and mark the corresponding pages as nosave for | |
690 | * hibernation (32 bit) or software suspend and suspend to RAM (64 bit). | |
691 | * | |
692 | * This function requires the e820 map to be sorted and without any | |
693 | * overlapping entries and assumes the first e820 area to be RAM. | |
694 | */ | |
695 | void __init e820_mark_nosave_regions(unsigned long limit_pfn) | |
696 | { | |
697 | int i; | |
698 | unsigned long pfn; | |
699 | ||
700 | pfn = PFN_DOWN(e820.map[0].addr + e820.map[0].size); | |
701 | for (i = 1; i < e820.nr_map; i++) { | |
702 | struct e820entry *ei = &e820.map[i]; | |
703 | ||
704 | if (pfn < PFN_UP(ei->addr)) | |
705 | register_nosave_region(pfn, PFN_UP(ei->addr)); | |
706 | ||
707 | pfn = PFN_DOWN(ei->addr + ei->size); | |
28bb2237 | 708 | if (ei->type != E820_RAM && ei->type != E820_RESERVED_KERN) |
bf62f398 YL |
709 | register_nosave_region(PFN_UP(ei->addr), pfn); |
710 | ||
711 | if (pfn >= limit_pfn) | |
712 | break; | |
713 | } | |
714 | } | |
715 | #endif | |
a4c81cf6 | 716 | |
b69edc76 RW |
717 | #ifdef CONFIG_HIBERNATION |
718 | /** | |
719 | * Mark ACPI NVS memory region, so that we can save/restore it during | |
720 | * hibernation and the subsequent resume. | |
721 | */ | |
722 | static int __init e820_mark_nvs_memory(void) | |
723 | { | |
724 | int i; | |
725 | ||
726 | for (i = 0; i < e820.nr_map; i++) { | |
727 | struct e820entry *ei = &e820.map[i]; | |
728 | ||
729 | if (ei->type == E820_NVS) | |
dd4c4f17 | 730 | suspend_nvs_register(ei->addr, ei->size); |
b69edc76 RW |
731 | } |
732 | ||
733 | return 0; | |
734 | } | |
735 | core_initcall(e820_mark_nvs_memory); | |
736 | #endif | |
737 | ||
2944e16b | 738 | /* |
72d7c3b3 | 739 | * pre allocated 4k and reserved it in memblock and e820_saved |
2944e16b YL |
740 | */ |
741 | u64 __init early_reserve_e820(u64 startt, u64 sizet, u64 align) | |
742 | { | |
743 | u64 size = 0; | |
744 | u64 addr; | |
745 | u64 start; | |
746 | ||
61438766 | 747 | for (start = startt; ; start += size) { |
72d7c3b3 YL |
748 | start = memblock_x86_find_in_range_size(start, &size, align); |
749 | if (start == MEMBLOCK_ERROR) | |
61438766 JB |
750 | return 0; |
751 | if (size >= sizet) | |
752 | break; | |
753 | } | |
2944e16b | 754 | |
5c0e6f03 JB |
755 | #ifdef CONFIG_X86_32 |
756 | if (start >= MAXMEM) | |
757 | return 0; | |
758 | if (start + size > MAXMEM) | |
759 | size = MAXMEM - start; | |
760 | #endif | |
761 | ||
2944e16b | 762 | addr = round_down(start + size - sizet, align); |
5c0e6f03 JB |
763 | if (addr < start) |
764 | return 0; | |
72d7c3b3 | 765 | memblock_x86_reserve_range(addr, addr + sizet, "new next"); |
fc9036ea | 766 | e820_update_range_saved(addr, sizet, E820_RAM, E820_RESERVED); |
72d7c3b3 | 767 | printk(KERN_INFO "update e820_saved for early_reserve_e820\n"); |
fc9036ea | 768 | update_e820_saved(); |
2944e16b YL |
769 | |
770 | return addr; | |
771 | } | |
772 | ||
ee0c80fa YL |
773 | #ifdef CONFIG_X86_32 |
774 | # ifdef CONFIG_X86_PAE | |
775 | # define MAX_ARCH_PFN (1ULL<<(36-PAGE_SHIFT)) | |
776 | # else | |
777 | # define MAX_ARCH_PFN (1ULL<<(32-PAGE_SHIFT)) | |
778 | # endif | |
779 | #else /* CONFIG_X86_32 */ | |
bd70e522 | 780 | # define MAX_ARCH_PFN MAXMEM>>PAGE_SHIFT |
ee0c80fa YL |
781 | #endif |
782 | ||
ee0c80fa YL |
783 | /* |
784 | * Find the highest page frame number we have available | |
785 | */ | |
f361a450 | 786 | static unsigned long __init e820_end_pfn(unsigned long limit_pfn, unsigned type) |
ee0c80fa | 787 | { |
2dc807b3 YL |
788 | int i; |
789 | unsigned long last_pfn = 0; | |
ee0c80fa YL |
790 | unsigned long max_arch_pfn = MAX_ARCH_PFN; |
791 | ||
2dc807b3 YL |
792 | for (i = 0; i < e820.nr_map; i++) { |
793 | struct e820entry *ei = &e820.map[i]; | |
f361a450 | 794 | unsigned long start_pfn; |
2dc807b3 YL |
795 | unsigned long end_pfn; |
796 | ||
f361a450 | 797 | if (ei->type != type) |
c22d4c18 | 798 | continue; |
c22d4c18 | 799 | |
f361a450 | 800 | start_pfn = ei->addr >> PAGE_SHIFT; |
2dc807b3 | 801 | end_pfn = (ei->addr + ei->size) >> PAGE_SHIFT; |
f361a450 YL |
802 | |
803 | if (start_pfn >= limit_pfn) | |
804 | continue; | |
805 | if (end_pfn > limit_pfn) { | |
806 | last_pfn = limit_pfn; | |
807 | break; | |
808 | } | |
2dc807b3 YL |
809 | if (end_pfn > last_pfn) |
810 | last_pfn = end_pfn; | |
811 | } | |
ee0c80fa YL |
812 | |
813 | if (last_pfn > max_arch_pfn) | |
814 | last_pfn = max_arch_pfn; | |
ee0c80fa | 815 | |
5dab8ec1 | 816 | printk(KERN_INFO "last_pfn = %#lx max_arch_pfn = %#lx\n", |
ee0c80fa YL |
817 | last_pfn, max_arch_pfn); |
818 | return last_pfn; | |
819 | } | |
f361a450 YL |
820 | unsigned long __init e820_end_of_ram_pfn(void) |
821 | { | |
822 | return e820_end_pfn(MAX_ARCH_PFN, E820_RAM); | |
823 | } | |
ee0c80fa | 824 | |
f361a450 YL |
825 | unsigned long __init e820_end_of_low_ram_pfn(void) |
826 | { | |
827 | return e820_end_pfn(1UL<<(32 - PAGE_SHIFT), E820_RAM); | |
828 | } | |
ee0c80fa | 829 | |
ab4a465e YL |
830 | static void early_panic(char *msg) |
831 | { | |
832 | early_printk(msg); | |
833 | panic(msg); | |
834 | } | |
835 | ||
69a7704d YL |
836 | static int userdef __initdata; |
837 | ||
ab4a465e YL |
838 | /* "mem=nopentium" disables the 4MB page tables. */ |
839 | static int __init parse_memopt(char *p) | |
840 | { | |
841 | u64 mem_size; | |
842 | ||
843 | if (!p) | |
844 | return -EINVAL; | |
845 | ||
ab4a465e | 846 | if (!strcmp(p, "nopentium")) { |
9a6d44b9 | 847 | #ifdef CONFIG_X86_32 |
ab4a465e YL |
848 | setup_clear_cpu_cap(X86_FEATURE_PSE); |
849 | return 0; | |
9a6d44b9 KM |
850 | #else |
851 | printk(KERN_WARNING "mem=nopentium ignored! (only supported on x86_32)\n"); | |
852 | return -EINVAL; | |
ab4a465e | 853 | #endif |
9a6d44b9 | 854 | } |
ab4a465e | 855 | |
69a7704d | 856 | userdef = 1; |
ab4a465e | 857 | mem_size = memparse(p, &p); |
77eed821 KM |
858 | /* don't remove all of memory when handling "mem={invalid}" param */ |
859 | if (mem_size == 0) | |
860 | return -EINVAL; | |
69a7704d | 861 | e820_remove_range(mem_size, ULLONG_MAX - mem_size, E820_RAM, 1); |
611dfd78 | 862 | |
ab4a465e YL |
863 | return 0; |
864 | } | |
865 | early_param("mem", parse_memopt); | |
866 | ||
ab4a465e YL |
867 | static int __init parse_memmap_opt(char *p) |
868 | { | |
869 | char *oldp; | |
870 | u64 start_at, mem_size; | |
871 | ||
a737abd1 CG |
872 | if (!p) |
873 | return -EINVAL; | |
874 | ||
d6be118a | 875 | if (!strncmp(p, "exactmap", 8)) { |
ab4a465e YL |
876 | #ifdef CONFIG_CRASH_DUMP |
877 | /* | |
878 | * If we are doing a crash dump, we still need to know | |
879 | * the real mem size before original memory map is | |
880 | * reset. | |
881 | */ | |
f361a450 | 882 | saved_max_pfn = e820_end_of_ram_pfn(); |
ab4a465e YL |
883 | #endif |
884 | e820.nr_map = 0; | |
885 | userdef = 1; | |
886 | return 0; | |
887 | } | |
888 | ||
889 | oldp = p; | |
890 | mem_size = memparse(p, &p); | |
891 | if (p == oldp) | |
892 | return -EINVAL; | |
893 | ||
894 | userdef = 1; | |
895 | if (*p == '@') { | |
896 | start_at = memparse(p+1, &p); | |
d0be6bde | 897 | e820_add_region(start_at, mem_size, E820_RAM); |
ab4a465e YL |
898 | } else if (*p == '#') { |
899 | start_at = memparse(p+1, &p); | |
d0be6bde | 900 | e820_add_region(start_at, mem_size, E820_ACPI); |
ab4a465e YL |
901 | } else if (*p == '$') { |
902 | start_at = memparse(p+1, &p); | |
d0be6bde | 903 | e820_add_region(start_at, mem_size, E820_RESERVED); |
7b479bec | 904 | } else |
69a7704d | 905 | e820_remove_range(mem_size, ULLONG_MAX - mem_size, E820_RAM, 1); |
7b479bec | 906 | |
ab4a465e YL |
907 | return *p == '\0' ? 0 : -EINVAL; |
908 | } | |
909 | early_param("memmap", parse_memmap_opt); | |
910 | ||
911 | void __init finish_e820_parsing(void) | |
912 | { | |
913 | if (userdef) { | |
ba639039 | 914 | u32 nr = e820.nr_map; |
ab4a465e YL |
915 | |
916 | if (sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &nr) < 0) | |
917 | early_panic("Invalid user supplied memory map"); | |
918 | e820.nr_map = nr; | |
919 | ||
920 | printk(KERN_INFO "user-defined physical RAM map:\n"); | |
921 | e820_print_map("user"); | |
922 | } | |
923 | } | |
41c094fd | 924 | |
5dfcf14d BW |
925 | static inline const char *e820_type_to_string(int e820_type) |
926 | { | |
927 | switch (e820_type) { | |
928 | case E820_RESERVED_KERN: | |
929 | case E820_RAM: return "System RAM"; | |
930 | case E820_ACPI: return "ACPI Tables"; | |
931 | case E820_NVS: return "ACPI Non-volatile Storage"; | |
671eef85 | 932 | case E820_UNUSABLE: return "Unusable memory"; |
5dfcf14d BW |
933 | default: return "reserved"; |
934 | } | |
935 | } | |
936 | ||
41c094fd YL |
937 | /* |
938 | * Mark e820 reserved areas as busy for the resource manager. | |
939 | */ | |
a5444d15 | 940 | static struct resource __initdata *e820_res; |
41c094fd YL |
941 | void __init e820_reserve_resources(void) |
942 | { | |
943 | int i; | |
58f7c988 | 944 | struct resource *res; |
a5444d15 | 945 | u64 end; |
41c094fd | 946 | |
3c1596ef | 947 | res = alloc_bootmem(sizeof(struct resource) * e820.nr_map); |
58f7c988 | 948 | e820_res = res; |
41c094fd | 949 | for (i = 0; i < e820.nr_map; i++) { |
b4df32f4 | 950 | end = e820.map[i].addr + e820.map[i].size - 1; |
8308c54d | 951 | if (end != (resource_size_t)end) { |
41c094fd YL |
952 | res++; |
953 | continue; | |
954 | } | |
5dfcf14d | 955 | res->name = e820_type_to_string(e820.map[i].type); |
b4df32f4 YL |
956 | res->start = e820.map[i].addr; |
957 | res->end = end; | |
958 | ||
1f987577 | 959 | res->flags = IORESOURCE_MEM; |
a5444d15 IM |
960 | |
961 | /* | |
962 | * don't register the region that could be conflicted with | |
963 | * pci device BAR resource and insert them later in | |
964 | * pcibios_resource_survey() | |
965 | */ | |
1f987577 LT |
966 | if (e820.map[i].type != E820_RESERVED || res->start < (1ULL<<20)) { |
967 | res->flags |= IORESOURCE_BUSY; | |
58f7c988 | 968 | insert_resource(&iomem_resource, res); |
1f987577 | 969 | } |
41c094fd YL |
970 | res++; |
971 | } | |
5dfcf14d BW |
972 | |
973 | for (i = 0; i < e820_saved.nr_map; i++) { | |
974 | struct e820entry *entry = &e820_saved.map[i]; | |
975 | firmware_map_add_early(entry->addr, | |
976 | entry->addr + entry->size - 1, | |
977 | e820_type_to_string(entry->type)); | |
978 | } | |
41c094fd YL |
979 | } |
980 | ||
45fbe3ee LT |
981 | /* How much should we pad RAM ending depending on where it is? */ |
982 | static unsigned long ram_alignment(resource_size_t pos) | |
983 | { | |
984 | unsigned long mb = pos >> 20; | |
985 | ||
986 | /* To 64kB in the first megabyte */ | |
987 | if (!mb) | |
988 | return 64*1024; | |
989 | ||
990 | /* To 1MB in the first 16MB */ | |
991 | if (mb < 16) | |
992 | return 1024*1024; | |
993 | ||
15b812f1 YL |
994 | /* To 64MB for anything above that */ |
995 | return 64*1024*1024; | |
45fbe3ee LT |
996 | } |
997 | ||
7c5371c4 YL |
998 | #define MAX_RESOURCE_SIZE ((resource_size_t)-1) |
999 | ||
58f7c988 YL |
1000 | void __init e820_reserve_resources_late(void) |
1001 | { | |
1002 | int i; | |
1003 | struct resource *res; | |
1004 | ||
1005 | res = e820_res; | |
1006 | for (i = 0; i < e820.nr_map; i++) { | |
a5444d15 | 1007 | if (!res->parent && res->end) |
1f987577 | 1008 | insert_resource_expand_to_fit(&iomem_resource, res); |
58f7c988 YL |
1009 | res++; |
1010 | } | |
45fbe3ee LT |
1011 | |
1012 | /* | |
1013 | * Try to bump up RAM regions to reasonable boundaries to | |
1014 | * avoid stolen RAM: | |
1015 | */ | |
1016 | for (i = 0; i < e820.nr_map; i++) { | |
7c5371c4 YL |
1017 | struct e820entry *entry = &e820.map[i]; |
1018 | u64 start, end; | |
45fbe3ee LT |
1019 | |
1020 | if (entry->type != E820_RAM) | |
1021 | continue; | |
1022 | start = entry->addr + entry->size; | |
7c5371c4 YL |
1023 | end = round_up(start, ram_alignment(start)) - 1; |
1024 | if (end > MAX_RESOURCE_SIZE) | |
1025 | end = MAX_RESOURCE_SIZE; | |
1026 | if (start >= end) | |
45fbe3ee | 1027 | continue; |
79c60169 YL |
1028 | printk(KERN_DEBUG "reserve RAM buffer: %016llx - %016llx ", |
1029 | start, end); | |
7c5371c4 YL |
1030 | reserve_region_with_split(&iomem_resource, start, end, |
1031 | "RAM buffer"); | |
45fbe3ee | 1032 | } |
58f7c988 YL |
1033 | } |
1034 | ||
95a71a45 | 1035 | char *__init default_machine_specific_memory_setup(void) |
064d25f1 YL |
1036 | { |
1037 | char *who = "BIOS-e820"; | |
ba639039 | 1038 | u32 new_nr; |
064d25f1 YL |
1039 | /* |
1040 | * Try to copy the BIOS-supplied E820-map. | |
1041 | * | |
1042 | * Otherwise fake a memory map; one section from 0k->640k, | |
1043 | * the next section from 1mb->appropriate_mem_k | |
1044 | */ | |
1045 | new_nr = boot_params.e820_entries; | |
1046 | sanitize_e820_map(boot_params.e820_map, | |
1047 | ARRAY_SIZE(boot_params.e820_map), | |
1048 | &new_nr); | |
1049 | boot_params.e820_entries = new_nr; | |
dc8e8120 YL |
1050 | if (append_e820_map(boot_params.e820_map, boot_params.e820_entries) |
1051 | < 0) { | |
95a71a45 | 1052 | u64 mem_size; |
064d25f1 YL |
1053 | |
1054 | /* compare results from other methods and take the greater */ | |
1055 | if (boot_params.alt_mem_k | |
1056 | < boot_params.screen_info.ext_mem_k) { | |
1057 | mem_size = boot_params.screen_info.ext_mem_k; | |
1058 | who = "BIOS-88"; | |
1059 | } else { | |
1060 | mem_size = boot_params.alt_mem_k; | |
1061 | who = "BIOS-e801"; | |
1062 | } | |
1063 | ||
1064 | e820.nr_map = 0; | |
1065 | e820_add_region(0, LOWMEMSIZE(), E820_RAM); | |
1066 | e820_add_region(HIGH_MEMORY, mem_size << 10, E820_RAM); | |
064d25f1 YL |
1067 | } |
1068 | ||
1069 | /* In case someone cares... */ | |
1070 | return who; | |
1071 | } | |
1072 | ||
064d25f1 YL |
1073 | void __init setup_memory_map(void) |
1074 | { | |
0be15526 YL |
1075 | char *who; |
1076 | ||
6b18ae3e | 1077 | who = x86_init.resources.memory_setup(); |
0be15526 | 1078 | memcpy(&e820_saved, &e820, sizeof(struct e820map)); |
064d25f1 | 1079 | printk(KERN_INFO "BIOS-provided physical RAM map:\n"); |
0be15526 | 1080 | e820_print_map(who); |
064d25f1 | 1081 | } |
72d7c3b3 YL |
1082 | |
1083 | void __init memblock_x86_fill(void) | |
1084 | { | |
1085 | int i; | |
1086 | u64 end; | |
1087 | ||
1088 | /* | |
1089 | * EFI may have more than 128 entries | |
1090 | * We are safe to enable resizing, beause memblock_x86_fill() | |
1091 | * is rather later for x86 | |
1092 | */ | |
1093 | memblock_can_resize = 1; | |
1094 | ||
1095 | for (i = 0; i < e820.nr_map; i++) { | |
1096 | struct e820entry *ei = &e820.map[i]; | |
1097 | ||
1098 | end = ei->addr + ei->size; | |
1099 | if (end != (resource_size_t)end) | |
1100 | continue; | |
1101 | ||
1102 | if (ei->type != E820_RAM && ei->type != E820_RESERVED_KERN) | |
1103 | continue; | |
1104 | ||
1105 | memblock_add(ei->addr, ei->size); | |
1106 | } | |
1107 | ||
1108 | memblock_analyze(); | |
1109 | memblock_dump_all(); | |
1110 | } | |
6f2a7536 YL |
1111 | |
1112 | void __init memblock_find_dma_reserve(void) | |
1113 | { | |
1114 | #ifdef CONFIG_X86_64 | |
1115 | u64 free_size_pfn; | |
1116 | u64 mem_size_pfn; | |
1117 | /* | |
1118 | * need to find out used area below MAX_DMA_PFN | |
1119 | * need to use memblock to get free size in [0, MAX_DMA_PFN] | |
1120 | * at first, and assume boot_mem will not take below MAX_DMA_PFN | |
1121 | */ | |
1122 | mem_size_pfn = memblock_x86_memory_in_range(0, MAX_DMA_PFN << PAGE_SHIFT) >> PAGE_SHIFT; | |
1123 | free_size_pfn = memblock_x86_free_memory_in_range(0, MAX_DMA_PFN << PAGE_SHIFT) >> PAGE_SHIFT; | |
1124 | set_dma_reserve(mem_size_pfn - free_size_pfn); | |
1125 | #endif | |
1126 | } |