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> |
d1bbdd66 | 22 | #include <linux/sort.h> |
b79cd8f1 | 23 | |
b79cd8f1 | 24 | #include <asm/e820.h> |
a4c81cf6 | 25 | #include <asm/proto.h> |
b79cd8f1 YL |
26 | #include <asm/setup.h> |
27 | ||
5dfcf14d BW |
28 | /* |
29 | * The e820 map is the map that gets modified e.g. with command line parameters | |
30 | * and that is also registered with modifications in the kernel resource tree | |
31 | * with the iomem_resource as parent. | |
32 | * | |
33 | * The e820_saved is directly saved after the BIOS-provided memory map is | |
34 | * copied. It doesn't get modified afterwards. It's registered for the | |
35 | * /sys/firmware/memmap interface. | |
36 | * | |
37 | * That memory map is not modified and is used as base for kexec. The kexec'd | |
38 | * kernel should get the same memory map as the firmware provides. Then the | |
39 | * user can e.g. boot the original kernel with mem=1G while still booting the | |
40 | * next kernel with full memory. | |
41 | */ | |
b79cd8f1 | 42 | struct e820map e820; |
5dfcf14d | 43 | struct e820map e820_saved; |
b79cd8f1 YL |
44 | |
45 | /* For PCI or other memory-mapped resources */ | |
46 | unsigned long pci_mem_start = 0xaeedbabe; | |
47 | #ifdef CONFIG_PCI | |
48 | EXPORT_SYMBOL(pci_mem_start); | |
49 | #endif | |
50 | ||
51 | /* | |
52 | * This function checks if any part of the range <start,end> is mapped | |
53 | * with type. | |
54 | */ | |
55 | int | |
56 | e820_any_mapped(u64 start, u64 end, unsigned type) | |
57 | { | |
58 | int i; | |
59 | ||
60 | for (i = 0; i < e820.nr_map; i++) { | |
61 | struct e820entry *ei = &e820.map[i]; | |
62 | ||
63 | if (type && ei->type != type) | |
64 | continue; | |
65 | if (ei->addr >= end || ei->addr + ei->size <= start) | |
66 | continue; | |
67 | return 1; | |
68 | } | |
69 | return 0; | |
70 | } | |
71 | EXPORT_SYMBOL_GPL(e820_any_mapped); | |
72 | ||
73 | /* | |
74 | * This function checks if the entire range <start,end> is mapped with type. | |
75 | * | |
76 | * Note: this function only works correct if the e820 table is sorted and | |
77 | * not-overlapping, which is the case | |
78 | */ | |
79 | int __init e820_all_mapped(u64 start, u64 end, unsigned type) | |
80 | { | |
81 | int i; | |
82 | ||
83 | for (i = 0; i < e820.nr_map; i++) { | |
84 | struct e820entry *ei = &e820.map[i]; | |
85 | ||
86 | if (type && ei->type != type) | |
87 | continue; | |
88 | /* is the region (part) in overlap with the current region ?*/ | |
89 | if (ei->addr >= end || ei->addr + ei->size <= start) | |
90 | continue; | |
91 | ||
92 | /* if the region is at the beginning of <start,end> we move | |
93 | * start to the end of the region since it's ok until there | |
94 | */ | |
95 | if (ei->addr <= start) | |
96 | start = ei->addr + ei->size; | |
97 | /* | |
98 | * if start is now at or beyond end, we're done, full | |
99 | * coverage | |
100 | */ | |
101 | if (start >= end) | |
102 | return 1; | |
103 | } | |
104 | return 0; | |
105 | } | |
106 | ||
107 | /* | |
108 | * Add a memory region to the kernel e820 map. | |
109 | */ | |
773e673d YL |
110 | static void __init __e820_add_region(struct e820map *e820x, u64 start, u64 size, |
111 | int type) | |
b79cd8f1 | 112 | { |
773e673d | 113 | int x = e820x->nr_map; |
b79cd8f1 | 114 | |
5051fd69 | 115 | if (x >= ARRAY_SIZE(e820x->map)) { |
91eb0f67 BH |
116 | printk(KERN_ERR "e820: too many entries; ignoring [mem %#010llx-%#010llx]\n", |
117 | (unsigned long long) start, | |
118 | (unsigned long long) (start + size - 1)); | |
b79cd8f1 YL |
119 | return; |
120 | } | |
121 | ||
773e673d YL |
122 | e820x->map[x].addr = start; |
123 | e820x->map[x].size = size; | |
124 | e820x->map[x].type = type; | |
125 | e820x->nr_map++; | |
126 | } | |
127 | ||
128 | void __init e820_add_region(u64 start, u64 size, int type) | |
129 | { | |
130 | __e820_add_region(&e820, start, size, type); | |
b79cd8f1 YL |
131 | } |
132 | ||
c61cf4cf YL |
133 | static void __init e820_print_type(u32 type) |
134 | { | |
135 | switch (type) { | |
136 | case E820_RAM: | |
137 | case E820_RESERVED_KERN: | |
91eb0f67 | 138 | printk(KERN_CONT "usable"); |
c61cf4cf YL |
139 | break; |
140 | case E820_RESERVED: | |
91eb0f67 | 141 | printk(KERN_CONT "reserved"); |
c61cf4cf YL |
142 | break; |
143 | case E820_ACPI: | |
91eb0f67 | 144 | printk(KERN_CONT "ACPI data"); |
c61cf4cf YL |
145 | break; |
146 | case E820_NVS: | |
91eb0f67 | 147 | printk(KERN_CONT "ACPI NVS"); |
c61cf4cf YL |
148 | break; |
149 | case E820_UNUSABLE: | |
91eb0f67 | 150 | printk(KERN_CONT "unusable"); |
c61cf4cf YL |
151 | break; |
152 | default: | |
153 | printk(KERN_CONT "type %u", type); | |
154 | break; | |
155 | } | |
156 | } | |
157 | ||
b79cd8f1 YL |
158 | void __init e820_print_map(char *who) |
159 | { | |
160 | int i; | |
161 | ||
162 | for (i = 0; i < e820.nr_map; i++) { | |
91eb0f67 | 163 | printk(KERN_INFO "%s: [mem %#018Lx-%#018Lx] ", who, |
b79cd8f1 YL |
164 | (unsigned long long) e820.map[i].addr, |
165 | (unsigned long long) | |
91eb0f67 | 166 | (e820.map[i].addr + e820.map[i].size - 1)); |
c61cf4cf YL |
167 | e820_print_type(e820.map[i].type); |
168 | printk(KERN_CONT "\n"); | |
b79cd8f1 YL |
169 | } |
170 | } | |
171 | ||
172 | /* | |
173 | * Sanitize the BIOS e820 map. | |
174 | * | |
175 | * Some e820 responses include overlapping entries. The following | |
5b7eb2e9 PJ |
176 | * replaces the original e820 map with a new one, removing overlaps, |
177 | * and resolving conflicting memory types in favor of highest | |
178 | * numbered type. | |
b79cd8f1 | 179 | * |
5b7eb2e9 PJ |
180 | * The input parameter biosmap points to an array of 'struct |
181 | * e820entry' which on entry has elements in the range [0, *pnr_map) | |
182 | * valid, and which has space for up to max_nr_map entries. | |
183 | * On return, the resulting sanitized e820 map entries will be in | |
184 | * overwritten in the same location, starting at biosmap. | |
185 | * | |
186 | * The integer pointed to by pnr_map must be valid on entry (the | |
187 | * current number of valid entries located at biosmap) and will | |
188 | * be updated on return, with the new number of valid entries | |
189 | * (something no more than max_nr_map.) | |
190 | * | |
191 | * The return value from sanitize_e820_map() is zero if it | |
192 | * successfully 'sanitized' the map entries passed in, and is -1 | |
193 | * if it did nothing, which can happen if either of (1) it was | |
194 | * only passed one map entry, or (2) any of the input map entries | |
195 | * were invalid (start + size < start, meaning that the size was | |
196 | * so big the described memory range wrapped around through zero.) | |
197 | * | |
198 | * Visually we're performing the following | |
199 | * (1,2,3,4 = memory types)... | |
200 | * | |
201 | * Sample memory map (w/overlaps): | |
202 | * ____22__________________ | |
203 | * ______________________4_ | |
204 | * ____1111________________ | |
205 | * _44_____________________ | |
206 | * 11111111________________ | |
207 | * ____________________33__ | |
208 | * ___________44___________ | |
209 | * __________33333_________ | |
210 | * ______________22________ | |
211 | * ___________________2222_ | |
212 | * _________111111111______ | |
213 | * _____________________11_ | |
214 | * _________________4______ | |
215 | * | |
216 | * Sanitized equivalent (no overlap): | |
217 | * 1_______________________ | |
218 | * _44_____________________ | |
219 | * ___1____________________ | |
220 | * ____22__________________ | |
221 | * ______11________________ | |
222 | * _________1______________ | |
223 | * __________3_____________ | |
224 | * ___________44___________ | |
225 | * _____________33_________ | |
226 | * _______________2________ | |
227 | * ________________1_______ | |
228 | * _________________4______ | |
229 | * ___________________2____ | |
230 | * ____________________33__ | |
231 | * ______________________4_ | |
b79cd8f1 | 232 | */ |
d1bbdd66 MD |
233 | struct change_member { |
234 | struct e820entry *pbios; /* pointer to original bios entry */ | |
235 | unsigned long long addr; /* address for this change point */ | |
236 | }; | |
237 | ||
238 | static int __init cpcompare(const void *a, const void *b) | |
239 | { | |
240 | struct change_member * const *app = a, * const *bpp = b; | |
241 | const struct change_member *ap = *app, *bp = *bpp; | |
242 | ||
243 | /* | |
244 | * Inputs are pointers to two elements of change_point[]. If their | |
245 | * addresses are unequal, their difference dominates. If the addresses | |
246 | * are equal, then consider one that represents the end of its region | |
247 | * to be greater than one that does not. | |
248 | */ | |
249 | if (ap->addr != bp->addr) | |
250 | return ap->addr > bp->addr ? 1 : -1; | |
251 | ||
252 | return (ap->addr != ap->pbios->addr) - (bp->addr != bp->pbios->addr); | |
253 | } | |
5b7eb2e9 | 254 | |
c3965bd1 | 255 | int __init sanitize_e820_map(struct e820entry *biosmap, int max_nr_map, |
ba639039 | 256 | u32 *pnr_map) |
b79cd8f1 | 257 | { |
157fabf0 PJ |
258 | static struct change_member change_point_list[2*E820_X_MAX] __initdata; |
259 | static struct change_member *change_point[2*E820_X_MAX] __initdata; | |
260 | static struct e820entry *overlap_list[E820_X_MAX] __initdata; | |
261 | static struct e820entry new_bios[E820_X_MAX] __initdata; | |
b79cd8f1 YL |
262 | unsigned long current_type, last_type; |
263 | unsigned long long last_addr; | |
d1bbdd66 | 264 | int chgidx; |
b79cd8f1 YL |
265 | int overlap_entries; |
266 | int new_bios_entry; | |
267 | int old_nr, new_nr, chg_nr; | |
268 | int i; | |
269 | ||
b79cd8f1 YL |
270 | /* if there's only one memory region, don't bother */ |
271 | if (*pnr_map < 2) | |
272 | return -1; | |
273 | ||
274 | old_nr = *pnr_map; | |
6e9bcc79 | 275 | BUG_ON(old_nr > max_nr_map); |
b79cd8f1 YL |
276 | |
277 | /* bail out if we find any unreasonable addresses in bios map */ | |
278 | for (i = 0; i < old_nr; i++) | |
279 | if (biosmap[i].addr + biosmap[i].size < biosmap[i].addr) | |
280 | return -1; | |
281 | ||
282 | /* create pointers for initial change-point information (for sorting) */ | |
283 | for (i = 0; i < 2 * old_nr; i++) | |
284 | change_point[i] = &change_point_list[i]; | |
285 | ||
286 | /* record all known change-points (starting and ending addresses), | |
287 | omitting those that are for empty memory regions */ | |
288 | chgidx = 0; | |
289 | for (i = 0; i < old_nr; i++) { | |
290 | if (biosmap[i].size != 0) { | |
291 | change_point[chgidx]->addr = biosmap[i].addr; | |
292 | change_point[chgidx++]->pbios = &biosmap[i]; | |
293 | change_point[chgidx]->addr = biosmap[i].addr + | |
294 | biosmap[i].size; | |
295 | change_point[chgidx++]->pbios = &biosmap[i]; | |
296 | } | |
297 | } | |
298 | chg_nr = chgidx; | |
299 | ||
300 | /* sort change-point list by memory addresses (low -> high) */ | |
706d9a9c | 301 | sort(change_point, chg_nr, sizeof *change_point, cpcompare, NULL); |
b79cd8f1 YL |
302 | |
303 | /* create a new bios memory map, removing overlaps */ | |
304 | overlap_entries = 0; /* number of entries in the overlap table */ | |
305 | new_bios_entry = 0; /* index for creating new bios map entries */ | |
306 | last_type = 0; /* start with undefined memory type */ | |
307 | last_addr = 0; /* start with 0 as last starting address */ | |
308 | ||
309 | /* loop through change-points, determining affect on the new bios map */ | |
310 | for (chgidx = 0; chgidx < chg_nr; chgidx++) { | |
311 | /* keep track of all overlapping bios entries */ | |
312 | if (change_point[chgidx]->addr == | |
313 | change_point[chgidx]->pbios->addr) { | |
314 | /* | |
315 | * add map entry to overlap list (> 1 entry | |
316 | * implies an overlap) | |
317 | */ | |
318 | overlap_list[overlap_entries++] = | |
319 | change_point[chgidx]->pbios; | |
320 | } else { | |
321 | /* | |
322 | * remove entry from list (order independent, | |
323 | * so swap with last) | |
324 | */ | |
325 | for (i = 0; i < overlap_entries; i++) { | |
326 | if (overlap_list[i] == | |
327 | change_point[chgidx]->pbios) | |
328 | overlap_list[i] = | |
329 | overlap_list[overlap_entries-1]; | |
330 | } | |
331 | overlap_entries--; | |
332 | } | |
333 | /* | |
334 | * if there are overlapping entries, decide which | |
335 | * "type" to use (larger value takes precedence -- | |
336 | * 1=usable, 2,3,4,4+=unusable) | |
337 | */ | |
338 | current_type = 0; | |
339 | for (i = 0; i < overlap_entries; i++) | |
340 | if (overlap_list[i]->type > current_type) | |
341 | current_type = overlap_list[i]->type; | |
342 | /* | |
343 | * continue building up new bios map based on this | |
344 | * information | |
345 | */ | |
346 | if (current_type != last_type) { | |
347 | if (last_type != 0) { | |
348 | new_bios[new_bios_entry].size = | |
349 | change_point[chgidx]->addr - last_addr; | |
350 | /* | |
351 | * move forward only if the new size | |
352 | * was non-zero | |
353 | */ | |
354 | if (new_bios[new_bios_entry].size != 0) | |
355 | /* | |
356 | * no more space left for new | |
357 | * bios entries ? | |
358 | */ | |
c3965bd1 | 359 | if (++new_bios_entry >= max_nr_map) |
b79cd8f1 YL |
360 | break; |
361 | } | |
362 | if (current_type != 0) { | |
363 | new_bios[new_bios_entry].addr = | |
364 | change_point[chgidx]->addr; | |
365 | new_bios[new_bios_entry].type = current_type; | |
366 | last_addr = change_point[chgidx]->addr; | |
367 | } | |
368 | last_type = current_type; | |
369 | } | |
370 | } | |
371 | /* retain count for new bios entries */ | |
372 | new_nr = new_bios_entry; | |
373 | ||
374 | /* copy new bios mapping into original location */ | |
375 | memcpy(biosmap, new_bios, new_nr * sizeof(struct e820entry)); | |
376 | *pnr_map = new_nr; | |
377 | ||
378 | return 0; | |
379 | } | |
380 | ||
dc8e8120 | 381 | static int __init __append_e820_map(struct e820entry *biosmap, int nr_map) |
8c5beb50 HY |
382 | { |
383 | while (nr_map) { | |
384 | u64 start = biosmap->addr; | |
385 | u64 size = biosmap->size; | |
386 | u64 end = start + size; | |
387 | u32 type = biosmap->type; | |
388 | ||
389 | /* Overflow in 64 bits? Ignore the memory map. */ | |
390 | if (start > end) | |
391 | return -1; | |
392 | ||
393 | e820_add_region(start, size, type); | |
394 | ||
395 | biosmap++; | |
396 | nr_map--; | |
397 | } | |
398 | return 0; | |
399 | } | |
400 | ||
b79cd8f1 YL |
401 | /* |
402 | * Copy the BIOS e820 map into a safe place. | |
403 | * | |
404 | * Sanity-check it while we're at it.. | |
405 | * | |
406 | * If we're lucky and live on a modern system, the setup code | |
407 | * will have given us a memory map that we can use to properly | |
408 | * set up memory. If we aren't, we'll fake a memory map. | |
409 | */ | |
dc8e8120 | 410 | static int __init append_e820_map(struct e820entry *biosmap, int nr_map) |
b79cd8f1 YL |
411 | { |
412 | /* Only one memory region (or negative)? Ignore it */ | |
413 | if (nr_map < 2) | |
414 | return -1; | |
415 | ||
dc8e8120 | 416 | return __append_e820_map(biosmap, nr_map); |
b79cd8f1 YL |
417 | } |
418 | ||
773e673d | 419 | static u64 __init __e820_update_range(struct e820map *e820x, u64 start, |
fc9036ea YL |
420 | u64 size, unsigned old_type, |
421 | unsigned new_type) | |
b79cd8f1 | 422 | { |
78a8b35b | 423 | u64 end; |
773e673d | 424 | unsigned int i; |
b79cd8f1 YL |
425 | u64 real_updated_size = 0; |
426 | ||
427 | BUG_ON(old_type == new_type); | |
428 | ||
232b957a YL |
429 | if (size > (ULLONG_MAX - start)) |
430 | size = ULLONG_MAX - start; | |
431 | ||
78a8b35b | 432 | end = start + size; |
91eb0f67 BH |
433 | printk(KERN_DEBUG "e820: update [mem %#010Lx-%#010Lx] ", |
434 | (unsigned long long) start, (unsigned long long) (end - 1)); | |
c61cf4cf YL |
435 | e820_print_type(old_type); |
436 | printk(KERN_CONT " ==> "); | |
437 | e820_print_type(new_type); | |
438 | printk(KERN_CONT "\n"); | |
439 | ||
5c0e6f03 | 440 | for (i = 0; i < e820x->nr_map; i++) { |
fc9036ea | 441 | struct e820entry *ei = &e820x->map[i]; |
b79cd8f1 | 442 | u64 final_start, final_end; |
78a8b35b YL |
443 | u64 ei_end; |
444 | ||
b79cd8f1 YL |
445 | if (ei->type != old_type) |
446 | continue; | |
78a8b35b YL |
447 | |
448 | ei_end = ei->addr + ei->size; | |
449 | /* totally covered by new range? */ | |
450 | if (ei->addr >= start && ei_end <= end) { | |
b79cd8f1 YL |
451 | ei->type = new_type; |
452 | real_updated_size += ei->size; | |
453 | continue; | |
454 | } | |
78a8b35b YL |
455 | |
456 | /* new range is totally covered? */ | |
457 | if (ei->addr < start && ei_end > end) { | |
458 | __e820_add_region(e820x, start, size, new_type); | |
459 | __e820_add_region(e820x, end, ei_end - end, ei->type); | |
460 | ei->size = start - ei->addr; | |
461 | real_updated_size += size; | |
462 | continue; | |
463 | } | |
464 | ||
b79cd8f1 YL |
465 | /* partially covered */ |
466 | final_start = max(start, ei->addr); | |
78a8b35b | 467 | final_end = min(end, ei_end); |
b79cd8f1 YL |
468 | if (final_start >= final_end) |
469 | continue; | |
5c0e6f03 | 470 | |
773e673d YL |
471 | __e820_add_region(e820x, final_start, final_end - final_start, |
472 | new_type); | |
5c0e6f03 | 473 | |
b79cd8f1 | 474 | real_updated_size += final_end - final_start; |
976dd4dc | 475 | |
773e673d YL |
476 | /* |
477 | * left range could be head or tail, so need to update | |
478 | * size at first. | |
479 | */ | |
480 | ei->size -= final_end - final_start; | |
976dd4dc YL |
481 | if (ei->addr < final_start) |
482 | continue; | |
483 | ei->addr = final_end; | |
b79cd8f1 YL |
484 | } |
485 | return real_updated_size; | |
486 | } | |
487 | ||
fc9036ea YL |
488 | u64 __init e820_update_range(u64 start, u64 size, unsigned old_type, |
489 | unsigned new_type) | |
490 | { | |
773e673d | 491 | return __e820_update_range(&e820, start, size, old_type, new_type); |
fc9036ea YL |
492 | } |
493 | ||
494 | static u64 __init e820_update_range_saved(u64 start, u64 size, | |
495 | unsigned old_type, unsigned new_type) | |
496 | { | |
773e673d | 497 | return __e820_update_range(&e820_saved, start, size, old_type, |
fc9036ea YL |
498 | new_type); |
499 | } | |
500 | ||
7a1fd986 YL |
501 | /* make e820 not cover the range */ |
502 | u64 __init e820_remove_range(u64 start, u64 size, unsigned old_type, | |
503 | int checktype) | |
504 | { | |
505 | int i; | |
1b5576e6 | 506 | u64 end; |
7a1fd986 YL |
507 | u64 real_removed_size = 0; |
508 | ||
232b957a YL |
509 | if (size > (ULLONG_MAX - start)) |
510 | size = ULLONG_MAX - start; | |
511 | ||
1b5576e6 | 512 | end = start + size; |
91eb0f67 BH |
513 | printk(KERN_DEBUG "e820: remove [mem %#010Lx-%#010Lx] ", |
514 | (unsigned long long) start, (unsigned long long) (end - 1)); | |
9f3a5f52 YL |
515 | if (checktype) |
516 | e820_print_type(old_type); | |
1b5576e6 YL |
517 | printk(KERN_CONT "\n"); |
518 | ||
7a1fd986 YL |
519 | for (i = 0; i < e820.nr_map; i++) { |
520 | struct e820entry *ei = &e820.map[i]; | |
521 | u64 final_start, final_end; | |
9f3a5f52 | 522 | u64 ei_end; |
7a1fd986 YL |
523 | |
524 | if (checktype && ei->type != old_type) | |
525 | continue; | |
9f3a5f52 YL |
526 | |
527 | ei_end = ei->addr + ei->size; | |
7a1fd986 | 528 | /* totally covered? */ |
9f3a5f52 | 529 | if (ei->addr >= start && ei_end <= end) { |
7a1fd986 YL |
530 | real_removed_size += ei->size; |
531 | memset(ei, 0, sizeof(struct e820entry)); | |
532 | continue; | |
533 | } | |
9f3a5f52 YL |
534 | |
535 | /* new range is totally covered? */ | |
536 | if (ei->addr < start && ei_end > end) { | |
537 | e820_add_region(end, ei_end - end, ei->type); | |
538 | ei->size = start - ei->addr; | |
539 | real_removed_size += size; | |
540 | continue; | |
541 | } | |
542 | ||
7a1fd986 YL |
543 | /* partially covered */ |
544 | final_start = max(start, ei->addr); | |
9f3a5f52 | 545 | final_end = min(end, ei_end); |
7a1fd986 YL |
546 | if (final_start >= final_end) |
547 | continue; | |
548 | real_removed_size += final_end - final_start; | |
549 | ||
9f3a5f52 YL |
550 | /* |
551 | * left range could be head or tail, so need to update | |
552 | * size at first. | |
553 | */ | |
7a1fd986 YL |
554 | ei->size -= final_end - final_start; |
555 | if (ei->addr < final_start) | |
556 | continue; | |
557 | ei->addr = final_end; | |
558 | } | |
559 | return real_removed_size; | |
560 | } | |
561 | ||
b79cd8f1 YL |
562 | void __init update_e820(void) |
563 | { | |
ba639039 | 564 | u32 nr_map; |
b79cd8f1 YL |
565 | |
566 | nr_map = e820.nr_map; | |
c3965bd1 | 567 | if (sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &nr_map)) |
b79cd8f1 YL |
568 | return; |
569 | e820.nr_map = nr_map; | |
91eb0f67 | 570 | printk(KERN_INFO "e820: modified physical RAM map:\n"); |
b79cd8f1 YL |
571 | e820_print_map("modified"); |
572 | } | |
fc9036ea YL |
573 | static void __init update_e820_saved(void) |
574 | { | |
ba639039 | 575 | u32 nr_map; |
fc9036ea YL |
576 | |
577 | nr_map = e820_saved.nr_map; | |
578 | if (sanitize_e820_map(e820_saved.map, ARRAY_SIZE(e820_saved.map), &nr_map)) | |
579 | return; | |
580 | e820_saved.nr_map = nr_map; | |
581 | } | |
fd6493e1 | 582 | #define MAX_GAP_END 0x100000000ull |
b79cd8f1 | 583 | /* |
fd6493e1 | 584 | * Search for a gap in the e820 memory space from start_addr to end_addr. |
b79cd8f1 | 585 | */ |
3381959d | 586 | __init int e820_search_gap(unsigned long *gapstart, unsigned long *gapsize, |
fd6493e1 | 587 | unsigned long start_addr, unsigned long long end_addr) |
b79cd8f1 | 588 | { |
fd6493e1 | 589 | unsigned long long last; |
3381959d | 590 | int i = e820.nr_map; |
b79cd8f1 YL |
591 | int found = 0; |
592 | ||
fd6493e1 AK |
593 | last = (end_addr && end_addr < MAX_GAP_END) ? end_addr : MAX_GAP_END; |
594 | ||
b79cd8f1 YL |
595 | while (--i >= 0) { |
596 | unsigned long long start = e820.map[i].addr; | |
597 | unsigned long long end = start + e820.map[i].size; | |
598 | ||
3381959d AK |
599 | if (end < start_addr) |
600 | continue; | |
601 | ||
b79cd8f1 YL |
602 | /* |
603 | * Since "last" is at most 4GB, we know we'll | |
604 | * fit in 32 bits if this condition is true | |
605 | */ | |
606 | if (last > end) { | |
607 | unsigned long gap = last - end; | |
608 | ||
3381959d AK |
609 | if (gap >= *gapsize) { |
610 | *gapsize = gap; | |
611 | *gapstart = end; | |
b79cd8f1 YL |
612 | found = 1; |
613 | } | |
614 | } | |
615 | if (start < last) | |
616 | last = start; | |
617 | } | |
3381959d AK |
618 | return found; |
619 | } | |
620 | ||
621 | /* | |
622 | * Search for the biggest gap in the low 32 bits of the e820 | |
623 | * memory space. We pass this space to PCI to assign MMIO resources | |
624 | * for hotplug or unconfigured devices in. | |
625 | * Hopefully the BIOS let enough space left. | |
626 | */ | |
627 | __init void e820_setup_gap(void) | |
628 | { | |
5d423ccd | 629 | unsigned long gapstart, gapsize; |
3381959d AK |
630 | int found; |
631 | ||
632 | gapstart = 0x10000000; | |
633 | gapsize = 0x400000; | |
fd6493e1 | 634 | found = e820_search_gap(&gapstart, &gapsize, 0, MAX_GAP_END); |
b79cd8f1 YL |
635 | |
636 | #ifdef CONFIG_X86_64 | |
637 | if (!found) { | |
c987d12f | 638 | gapstart = (max_pfn << PAGE_SHIFT) + 1024*1024; |
ad361c98 | 639 | printk(KERN_ERR |
91eb0f67 BH |
640 | "e820: cannot find a gap in the 32bit address range\n" |
641 | "e820: PCI devices with unassigned 32bit BARs may break!\n"); | |
b79cd8f1 YL |
642 | } |
643 | #endif | |
644 | ||
645 | /* | |
5d423ccd | 646 | * e820_reserve_resources_late protect stolen RAM already |
b79cd8f1 | 647 | */ |
5d423ccd | 648 | pci_mem_start = gapstart; |
b79cd8f1 YL |
649 | |
650 | printk(KERN_INFO | |
91eb0f67 BH |
651 | "e820: [mem %#010lx-%#010lx] available for PCI devices\n", |
652 | gapstart, gapstart + gapsize - 1); | |
b79cd8f1 YL |
653 | } |
654 | ||
8c5beb50 HY |
655 | /** |
656 | * Because of the size limitation of struct boot_params, only first | |
657 | * 128 E820 memory entries are passed to kernel via | |
658 | * boot_params.e820_map, others are passed via SETUP_E820_EXT node of | |
659 | * linked list of struct setup_data, which is parsed here. | |
660 | */ | |
30e46b57 | 661 | void __init parse_e820_ext(u64 phys_addr, u32 data_len) |
8c5beb50 | 662 | { |
8c5beb50 HY |
663 | int entries; |
664 | struct e820entry *extmap; | |
30e46b57 | 665 | struct setup_data *sdata; |
8c5beb50 | 666 | |
30e46b57 | 667 | sdata = early_memremap(phys_addr, data_len); |
8c5beb50 | 668 | entries = sdata->len / sizeof(struct e820entry); |
8c5beb50 | 669 | extmap = (struct e820entry *)(sdata->data); |
dc8e8120 | 670 | __append_e820_map(extmap, entries); |
8c5beb50 | 671 | sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map); |
30e46b57 | 672 | early_iounmap(sdata, data_len); |
91eb0f67 | 673 | printk(KERN_INFO "e820: extended physical RAM map:\n"); |
8c5beb50 HY |
674 | e820_print_map("extended"); |
675 | } | |
676 | ||
bf62f398 YL |
677 | #if defined(CONFIG_X86_64) || \ |
678 | (defined(CONFIG_X86_32) && defined(CONFIG_HIBERNATION)) | |
679 | /** | |
680 | * Find the ranges of physical addresses that do not correspond to | |
681 | * e820 RAM areas and mark the corresponding pages as nosave for | |
682 | * hibernation (32 bit) or software suspend and suspend to RAM (64 bit). | |
683 | * | |
684 | * This function requires the e820 map to be sorted and without any | |
685 | * overlapping entries and assumes the first e820 area to be RAM. | |
686 | */ | |
687 | void __init e820_mark_nosave_regions(unsigned long limit_pfn) | |
688 | { | |
689 | int i; | |
690 | unsigned long pfn; | |
691 | ||
692 | pfn = PFN_DOWN(e820.map[0].addr + e820.map[0].size); | |
693 | for (i = 1; i < e820.nr_map; i++) { | |
694 | struct e820entry *ei = &e820.map[i]; | |
695 | ||
696 | if (pfn < PFN_UP(ei->addr)) | |
697 | register_nosave_region(pfn, PFN_UP(ei->addr)); | |
698 | ||
699 | pfn = PFN_DOWN(ei->addr + ei->size); | |
28bb2237 | 700 | if (ei->type != E820_RAM && ei->type != E820_RESERVED_KERN) |
bf62f398 YL |
701 | register_nosave_region(PFN_UP(ei->addr), pfn); |
702 | ||
703 | if (pfn >= limit_pfn) | |
704 | break; | |
705 | } | |
706 | } | |
707 | #endif | |
a4c81cf6 | 708 | |
b54ac6d2 | 709 | #ifdef CONFIG_ACPI |
b69edc76 RW |
710 | /** |
711 | * Mark ACPI NVS memory region, so that we can save/restore it during | |
712 | * hibernation and the subsequent resume. | |
713 | */ | |
714 | static int __init e820_mark_nvs_memory(void) | |
715 | { | |
716 | int i; | |
717 | ||
718 | for (i = 0; i < e820.nr_map; i++) { | |
719 | struct e820entry *ei = &e820.map[i]; | |
720 | ||
721 | if (ei->type == E820_NVS) | |
b54ac6d2 | 722 | acpi_nvs_register(ei->addr, ei->size); |
b69edc76 RW |
723 | } |
724 | ||
725 | return 0; | |
726 | } | |
727 | core_initcall(e820_mark_nvs_memory); | |
728 | #endif | |
729 | ||
2944e16b | 730 | /* |
72d7c3b3 | 731 | * pre allocated 4k and reserved it in memblock and e820_saved |
2944e16b | 732 | */ |
ab5d140b | 733 | u64 __init early_reserve_e820(u64 size, u64 align) |
2944e16b | 734 | { |
2944e16b | 735 | u64 addr; |
2944e16b | 736 | |
ab5d140b TH |
737 | addr = __memblock_alloc_base(size, align, MEMBLOCK_ALLOC_ACCESSIBLE); |
738 | if (addr) { | |
739 | e820_update_range_saved(addr, size, E820_RAM, E820_RESERVED); | |
91eb0f67 | 740 | printk(KERN_INFO "e820: update e820_saved for early_reserve_e820\n"); |
ab5d140b | 741 | update_e820_saved(); |
61438766 | 742 | } |
2944e16b | 743 | |
2944e16b YL |
744 | return addr; |
745 | } | |
746 | ||
ee0c80fa YL |
747 | #ifdef CONFIG_X86_32 |
748 | # ifdef CONFIG_X86_PAE | |
749 | # define MAX_ARCH_PFN (1ULL<<(36-PAGE_SHIFT)) | |
750 | # else | |
751 | # define MAX_ARCH_PFN (1ULL<<(32-PAGE_SHIFT)) | |
752 | # endif | |
753 | #else /* CONFIG_X86_32 */ | |
bd70e522 | 754 | # define MAX_ARCH_PFN MAXMEM>>PAGE_SHIFT |
ee0c80fa YL |
755 | #endif |
756 | ||
ee0c80fa YL |
757 | /* |
758 | * Find the highest page frame number we have available | |
759 | */ | |
f361a450 | 760 | static unsigned long __init e820_end_pfn(unsigned long limit_pfn, unsigned type) |
ee0c80fa | 761 | { |
2dc807b3 YL |
762 | int i; |
763 | unsigned long last_pfn = 0; | |
ee0c80fa YL |
764 | unsigned long max_arch_pfn = MAX_ARCH_PFN; |
765 | ||
2dc807b3 YL |
766 | for (i = 0; i < e820.nr_map; i++) { |
767 | struct e820entry *ei = &e820.map[i]; | |
f361a450 | 768 | unsigned long start_pfn; |
2dc807b3 YL |
769 | unsigned long end_pfn; |
770 | ||
f361a450 | 771 | if (ei->type != type) |
c22d4c18 | 772 | continue; |
c22d4c18 | 773 | |
f361a450 | 774 | start_pfn = ei->addr >> PAGE_SHIFT; |
2dc807b3 | 775 | end_pfn = (ei->addr + ei->size) >> PAGE_SHIFT; |
f361a450 YL |
776 | |
777 | if (start_pfn >= limit_pfn) | |
778 | continue; | |
779 | if (end_pfn > limit_pfn) { | |
780 | last_pfn = limit_pfn; | |
781 | break; | |
782 | } | |
2dc807b3 YL |
783 | if (end_pfn > last_pfn) |
784 | last_pfn = end_pfn; | |
785 | } | |
ee0c80fa YL |
786 | |
787 | if (last_pfn > max_arch_pfn) | |
788 | last_pfn = max_arch_pfn; | |
ee0c80fa | 789 | |
91eb0f67 | 790 | printk(KERN_INFO "e820: last_pfn = %#lx max_arch_pfn = %#lx\n", |
ee0c80fa YL |
791 | last_pfn, max_arch_pfn); |
792 | return last_pfn; | |
793 | } | |
f361a450 YL |
794 | unsigned long __init e820_end_of_ram_pfn(void) |
795 | { | |
796 | return e820_end_pfn(MAX_ARCH_PFN, E820_RAM); | |
797 | } | |
ee0c80fa | 798 | |
f361a450 YL |
799 | unsigned long __init e820_end_of_low_ram_pfn(void) |
800 | { | |
801 | return e820_end_pfn(1UL<<(32 - PAGE_SHIFT), E820_RAM); | |
802 | } | |
ee0c80fa | 803 | |
ab4a465e YL |
804 | static void early_panic(char *msg) |
805 | { | |
806 | early_printk(msg); | |
807 | panic(msg); | |
808 | } | |
809 | ||
69a7704d YL |
810 | static int userdef __initdata; |
811 | ||
ab4a465e YL |
812 | /* "mem=nopentium" disables the 4MB page tables. */ |
813 | static int __init parse_memopt(char *p) | |
814 | { | |
815 | u64 mem_size; | |
816 | ||
817 | if (!p) | |
818 | return -EINVAL; | |
819 | ||
ab4a465e | 820 | if (!strcmp(p, "nopentium")) { |
9a6d44b9 | 821 | #ifdef CONFIG_X86_32 |
ab4a465e YL |
822 | setup_clear_cpu_cap(X86_FEATURE_PSE); |
823 | return 0; | |
9a6d44b9 KM |
824 | #else |
825 | printk(KERN_WARNING "mem=nopentium ignored! (only supported on x86_32)\n"); | |
826 | return -EINVAL; | |
ab4a465e | 827 | #endif |
9a6d44b9 | 828 | } |
ab4a465e | 829 | |
69a7704d | 830 | userdef = 1; |
ab4a465e | 831 | mem_size = memparse(p, &p); |
77eed821 KM |
832 | /* don't remove all of memory when handling "mem={invalid}" param */ |
833 | if (mem_size == 0) | |
834 | return -EINVAL; | |
69a7704d | 835 | e820_remove_range(mem_size, ULLONG_MAX - mem_size, E820_RAM, 1); |
611dfd78 | 836 | |
ab4a465e YL |
837 | return 0; |
838 | } | |
839 | early_param("mem", parse_memopt); | |
840 | ||
9710f581 | 841 | static int __init parse_memmap_one(char *p) |
ab4a465e YL |
842 | { |
843 | char *oldp; | |
844 | u64 start_at, mem_size; | |
845 | ||
a737abd1 CG |
846 | if (!p) |
847 | return -EINVAL; | |
848 | ||
d6be118a | 849 | if (!strncmp(p, "exactmap", 8)) { |
ab4a465e YL |
850 | #ifdef CONFIG_CRASH_DUMP |
851 | /* | |
852 | * If we are doing a crash dump, we still need to know | |
853 | * the real mem size before original memory map is | |
854 | * reset. | |
855 | */ | |
f361a450 | 856 | saved_max_pfn = e820_end_of_ram_pfn(); |
ab4a465e YL |
857 | #endif |
858 | e820.nr_map = 0; | |
859 | userdef = 1; | |
860 | return 0; | |
861 | } | |
862 | ||
863 | oldp = p; | |
864 | mem_size = memparse(p, &p); | |
865 | if (p == oldp) | |
866 | return -EINVAL; | |
867 | ||
868 | userdef = 1; | |
869 | if (*p == '@') { | |
870 | start_at = memparse(p+1, &p); | |
d0be6bde | 871 | e820_add_region(start_at, mem_size, E820_RAM); |
ab4a465e YL |
872 | } else if (*p == '#') { |
873 | start_at = memparse(p+1, &p); | |
d0be6bde | 874 | e820_add_region(start_at, mem_size, E820_ACPI); |
ab4a465e YL |
875 | } else if (*p == '$') { |
876 | start_at = memparse(p+1, &p); | |
d0be6bde | 877 | e820_add_region(start_at, mem_size, E820_RESERVED); |
7b479bec | 878 | } else |
69a7704d | 879 | e820_remove_range(mem_size, ULLONG_MAX - mem_size, E820_RAM, 1); |
7b479bec | 880 | |
ab4a465e YL |
881 | return *p == '\0' ? 0 : -EINVAL; |
882 | } | |
9710f581 YL |
883 | static int __init parse_memmap_opt(char *str) |
884 | { | |
885 | while (str) { | |
886 | char *k = strchr(str, ','); | |
887 | ||
888 | if (k) | |
889 | *k++ = 0; | |
890 | ||
891 | parse_memmap_one(str); | |
892 | str = k; | |
893 | } | |
894 | ||
895 | return 0; | |
896 | } | |
ab4a465e YL |
897 | early_param("memmap", parse_memmap_opt); |
898 | ||
899 | void __init finish_e820_parsing(void) | |
900 | { | |
901 | if (userdef) { | |
ba639039 | 902 | u32 nr = e820.nr_map; |
ab4a465e YL |
903 | |
904 | if (sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &nr) < 0) | |
905 | early_panic("Invalid user supplied memory map"); | |
906 | e820.nr_map = nr; | |
907 | ||
91eb0f67 | 908 | printk(KERN_INFO "e820: user-defined physical RAM map:\n"); |
ab4a465e YL |
909 | e820_print_map("user"); |
910 | } | |
911 | } | |
41c094fd | 912 | |
5dfcf14d BW |
913 | static inline const char *e820_type_to_string(int e820_type) |
914 | { | |
915 | switch (e820_type) { | |
916 | case E820_RESERVED_KERN: | |
917 | case E820_RAM: return "System RAM"; | |
918 | case E820_ACPI: return "ACPI Tables"; | |
919 | case E820_NVS: return "ACPI Non-volatile Storage"; | |
671eef85 | 920 | case E820_UNUSABLE: return "Unusable memory"; |
5dfcf14d BW |
921 | default: return "reserved"; |
922 | } | |
923 | } | |
924 | ||
41c094fd YL |
925 | /* |
926 | * Mark e820 reserved areas as busy for the resource manager. | |
927 | */ | |
a5444d15 | 928 | static struct resource __initdata *e820_res; |
41c094fd YL |
929 | void __init e820_reserve_resources(void) |
930 | { | |
931 | int i; | |
58f7c988 | 932 | struct resource *res; |
a5444d15 | 933 | u64 end; |
41c094fd | 934 | |
3c1596ef | 935 | res = alloc_bootmem(sizeof(struct resource) * e820.nr_map); |
58f7c988 | 936 | e820_res = res; |
41c094fd | 937 | for (i = 0; i < e820.nr_map; i++) { |
b4df32f4 | 938 | end = e820.map[i].addr + e820.map[i].size - 1; |
8308c54d | 939 | if (end != (resource_size_t)end) { |
41c094fd YL |
940 | res++; |
941 | continue; | |
942 | } | |
5dfcf14d | 943 | res->name = e820_type_to_string(e820.map[i].type); |
b4df32f4 YL |
944 | res->start = e820.map[i].addr; |
945 | res->end = end; | |
946 | ||
1f987577 | 947 | res->flags = IORESOURCE_MEM; |
a5444d15 IM |
948 | |
949 | /* | |
950 | * don't register the region that could be conflicted with | |
951 | * pci device BAR resource and insert them later in | |
952 | * pcibios_resource_survey() | |
953 | */ | |
1f987577 LT |
954 | if (e820.map[i].type != E820_RESERVED || res->start < (1ULL<<20)) { |
955 | res->flags |= IORESOURCE_BUSY; | |
58f7c988 | 956 | insert_resource(&iomem_resource, res); |
1f987577 | 957 | } |
41c094fd YL |
958 | res++; |
959 | } | |
5dfcf14d BW |
960 | |
961 | for (i = 0; i < e820_saved.nr_map; i++) { | |
962 | struct e820entry *entry = &e820_saved.map[i]; | |
963 | firmware_map_add_early(entry->addr, | |
4ed940d4 | 964 | entry->addr + entry->size, |
5dfcf14d BW |
965 | e820_type_to_string(entry->type)); |
966 | } | |
41c094fd YL |
967 | } |
968 | ||
45fbe3ee LT |
969 | /* How much should we pad RAM ending depending on where it is? */ |
970 | static unsigned long ram_alignment(resource_size_t pos) | |
971 | { | |
972 | unsigned long mb = pos >> 20; | |
973 | ||
974 | /* To 64kB in the first megabyte */ | |
975 | if (!mb) | |
976 | return 64*1024; | |
977 | ||
978 | /* To 1MB in the first 16MB */ | |
979 | if (mb < 16) | |
980 | return 1024*1024; | |
981 | ||
15b812f1 YL |
982 | /* To 64MB for anything above that */ |
983 | return 64*1024*1024; | |
45fbe3ee LT |
984 | } |
985 | ||
7c5371c4 YL |
986 | #define MAX_RESOURCE_SIZE ((resource_size_t)-1) |
987 | ||
58f7c988 YL |
988 | void __init e820_reserve_resources_late(void) |
989 | { | |
990 | int i; | |
991 | struct resource *res; | |
992 | ||
993 | res = e820_res; | |
994 | for (i = 0; i < e820.nr_map; i++) { | |
a5444d15 | 995 | if (!res->parent && res->end) |
1f987577 | 996 | insert_resource_expand_to_fit(&iomem_resource, res); |
58f7c988 YL |
997 | res++; |
998 | } | |
45fbe3ee LT |
999 | |
1000 | /* | |
1001 | * Try to bump up RAM regions to reasonable boundaries to | |
1002 | * avoid stolen RAM: | |
1003 | */ | |
1004 | for (i = 0; i < e820.nr_map; i++) { | |
7c5371c4 YL |
1005 | struct e820entry *entry = &e820.map[i]; |
1006 | u64 start, end; | |
45fbe3ee LT |
1007 | |
1008 | if (entry->type != E820_RAM) | |
1009 | continue; | |
1010 | start = entry->addr + entry->size; | |
7c5371c4 YL |
1011 | end = round_up(start, ram_alignment(start)) - 1; |
1012 | if (end > MAX_RESOURCE_SIZE) | |
1013 | end = MAX_RESOURCE_SIZE; | |
1014 | if (start >= end) | |
45fbe3ee | 1015 | continue; |
91eb0f67 BH |
1016 | printk(KERN_DEBUG |
1017 | "e820: reserve RAM buffer [mem %#010llx-%#010llx]\n", | |
1018 | start, end); | |
7c5371c4 YL |
1019 | reserve_region_with_split(&iomem_resource, start, end, |
1020 | "RAM buffer"); | |
45fbe3ee | 1021 | } |
58f7c988 YL |
1022 | } |
1023 | ||
95a71a45 | 1024 | char *__init default_machine_specific_memory_setup(void) |
064d25f1 YL |
1025 | { |
1026 | char *who = "BIOS-e820"; | |
ba639039 | 1027 | u32 new_nr; |
064d25f1 YL |
1028 | /* |
1029 | * Try to copy the BIOS-supplied E820-map. | |
1030 | * | |
1031 | * Otherwise fake a memory map; one section from 0k->640k, | |
1032 | * the next section from 1mb->appropriate_mem_k | |
1033 | */ | |
1034 | new_nr = boot_params.e820_entries; | |
1035 | sanitize_e820_map(boot_params.e820_map, | |
1036 | ARRAY_SIZE(boot_params.e820_map), | |
1037 | &new_nr); | |
1038 | boot_params.e820_entries = new_nr; | |
dc8e8120 YL |
1039 | if (append_e820_map(boot_params.e820_map, boot_params.e820_entries) |
1040 | < 0) { | |
95a71a45 | 1041 | u64 mem_size; |
064d25f1 YL |
1042 | |
1043 | /* compare results from other methods and take the greater */ | |
1044 | if (boot_params.alt_mem_k | |
1045 | < boot_params.screen_info.ext_mem_k) { | |
1046 | mem_size = boot_params.screen_info.ext_mem_k; | |
1047 | who = "BIOS-88"; | |
1048 | } else { | |
1049 | mem_size = boot_params.alt_mem_k; | |
1050 | who = "BIOS-e801"; | |
1051 | } | |
1052 | ||
1053 | e820.nr_map = 0; | |
1054 | e820_add_region(0, LOWMEMSIZE(), E820_RAM); | |
1055 | e820_add_region(HIGH_MEMORY, mem_size << 10, E820_RAM); | |
064d25f1 YL |
1056 | } |
1057 | ||
1058 | /* In case someone cares... */ | |
1059 | return who; | |
1060 | } | |
1061 | ||
064d25f1 YL |
1062 | void __init setup_memory_map(void) |
1063 | { | |
0be15526 YL |
1064 | char *who; |
1065 | ||
6b18ae3e | 1066 | who = x86_init.resources.memory_setup(); |
0be15526 | 1067 | memcpy(&e820_saved, &e820, sizeof(struct e820map)); |
91eb0f67 | 1068 | printk(KERN_INFO "e820: BIOS-provided physical RAM map:\n"); |
0be15526 | 1069 | e820_print_map(who); |
064d25f1 | 1070 | } |
72d7c3b3 YL |
1071 | |
1072 | void __init memblock_x86_fill(void) | |
1073 | { | |
1074 | int i; | |
1075 | u64 end; | |
1076 | ||
1077 | /* | |
1078 | * EFI may have more than 128 entries | |
1079 | * We are safe to enable resizing, beause memblock_x86_fill() | |
1080 | * is rather later for x86 | |
1081 | */ | |
1aadc056 | 1082 | memblock_allow_resize(); |
72d7c3b3 YL |
1083 | |
1084 | for (i = 0; i < e820.nr_map; i++) { | |
1085 | struct e820entry *ei = &e820.map[i]; | |
1086 | ||
1087 | end = ei->addr + ei->size; | |
1088 | if (end != (resource_size_t)end) | |
1089 | continue; | |
1090 | ||
1091 | if (ei->type != E820_RAM && ei->type != E820_RESERVED_KERN) | |
1092 | continue; | |
1093 | ||
1094 | memblock_add(ei->addr, ei->size); | |
1095 | } | |
1096 | ||
6ede1fd3 YL |
1097 | /* throw away partial pages */ |
1098 | memblock_trim_memory(PAGE_SIZE); | |
1099 | ||
72d7c3b3 YL |
1100 | memblock_dump_all(); |
1101 | } | |
6f2a7536 YL |
1102 | |
1103 | void __init memblock_find_dma_reserve(void) | |
1104 | { | |
1105 | #ifdef CONFIG_X86_64 | |
6b5d41a1 TH |
1106 | u64 nr_pages = 0, nr_free_pages = 0; |
1107 | unsigned long start_pfn, end_pfn; | |
1108 | phys_addr_t start, end; | |
1109 | int i; | |
1110 | u64 u; | |
1111 | ||
6f2a7536 YL |
1112 | /* |
1113 | * need to find out used area below MAX_DMA_PFN | |
1114 | * need to use memblock to get free size in [0, MAX_DMA_PFN] | |
1115 | * at first, and assume boot_mem will not take below MAX_DMA_PFN | |
1116 | */ | |
6b5d41a1 TH |
1117 | for_each_mem_pfn_range(i, MAX_NUMNODES, &start_pfn, &end_pfn, NULL) { |
1118 | start_pfn = min_t(unsigned long, start_pfn, MAX_DMA_PFN); | |
1119 | end_pfn = min_t(unsigned long, end_pfn, MAX_DMA_PFN); | |
1120 | nr_pages += end_pfn - start_pfn; | |
1121 | } | |
1122 | ||
1123 | for_each_free_mem_range(u, MAX_NUMNODES, &start, &end, NULL) { | |
1124 | start_pfn = min_t(unsigned long, PFN_UP(start), MAX_DMA_PFN); | |
1125 | end_pfn = min_t(unsigned long, PFN_DOWN(end), MAX_DMA_PFN); | |
1126 | if (start_pfn < end_pfn) | |
1127 | nr_free_pages += end_pfn - start_pfn; | |
1128 | } | |
1129 | ||
1130 | set_dma_reserve(nr_pages - nr_free_pages); | |
6f2a7536 YL |
1131 | #endif |
1132 | } |