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> | |
14 | #include <linux/bootmem.h> | |
b79cd8f1 | 15 | #include <linux/pfn.h> |
bf62f398 | 16 | #include <linux/suspend.h> |
5dfcf14d | 17 | #include <linux/firmware-map.h> |
b79cd8f1 | 18 | |
b79cd8f1 | 19 | #include <asm/e820.h> |
a4c81cf6 | 20 | #include <asm/proto.h> |
b79cd8f1 YL |
21 | #include <asm/setup.h> |
22 | ||
5dfcf14d BW |
23 | /* |
24 | * The e820 map is the map that gets modified e.g. with command line parameters | |
25 | * and that is also registered with modifications in the kernel resource tree | |
26 | * with the iomem_resource as parent. | |
27 | * | |
28 | * The e820_saved is directly saved after the BIOS-provided memory map is | |
29 | * copied. It doesn't get modified afterwards. It's registered for the | |
30 | * /sys/firmware/memmap interface. | |
31 | * | |
32 | * That memory map is not modified and is used as base for kexec. The kexec'd | |
33 | * kernel should get the same memory map as the firmware provides. Then the | |
34 | * user can e.g. boot the original kernel with mem=1G while still booting the | |
35 | * next kernel with full memory. | |
36 | */ | |
b79cd8f1 | 37 | struct e820map e820; |
5dfcf14d | 38 | struct e820map e820_saved; |
b79cd8f1 YL |
39 | |
40 | /* For PCI or other memory-mapped resources */ | |
41 | unsigned long pci_mem_start = 0xaeedbabe; | |
42 | #ifdef CONFIG_PCI | |
43 | EXPORT_SYMBOL(pci_mem_start); | |
44 | #endif | |
45 | ||
46 | /* | |
47 | * This function checks if any part of the range <start,end> is mapped | |
48 | * with type. | |
49 | */ | |
50 | int | |
51 | e820_any_mapped(u64 start, u64 end, unsigned type) | |
52 | { | |
53 | int i; | |
54 | ||
55 | for (i = 0; i < e820.nr_map; i++) { | |
56 | struct e820entry *ei = &e820.map[i]; | |
57 | ||
58 | if (type && ei->type != type) | |
59 | continue; | |
60 | if (ei->addr >= end || ei->addr + ei->size <= start) | |
61 | continue; | |
62 | return 1; | |
63 | } | |
64 | return 0; | |
65 | } | |
66 | EXPORT_SYMBOL_GPL(e820_any_mapped); | |
67 | ||
68 | /* | |
69 | * This function checks if the entire range <start,end> is mapped with type. | |
70 | * | |
71 | * Note: this function only works correct if the e820 table is sorted and | |
72 | * not-overlapping, which is the case | |
73 | */ | |
74 | int __init e820_all_mapped(u64 start, u64 end, unsigned type) | |
75 | { | |
76 | int i; | |
77 | ||
78 | for (i = 0; i < e820.nr_map; i++) { | |
79 | struct e820entry *ei = &e820.map[i]; | |
80 | ||
81 | if (type && ei->type != type) | |
82 | continue; | |
83 | /* is the region (part) in overlap with the current region ?*/ | |
84 | if (ei->addr >= end || ei->addr + ei->size <= start) | |
85 | continue; | |
86 | ||
87 | /* if the region is at the beginning of <start,end> we move | |
88 | * start to the end of the region since it's ok until there | |
89 | */ | |
90 | if (ei->addr <= start) | |
91 | start = ei->addr + ei->size; | |
92 | /* | |
93 | * if start is now at or beyond end, we're done, full | |
94 | * coverage | |
95 | */ | |
96 | if (start >= end) | |
97 | return 1; | |
98 | } | |
99 | return 0; | |
100 | } | |
101 | ||
102 | /* | |
103 | * Add a memory region to the kernel e820 map. | |
104 | */ | |
773e673d YL |
105 | static void __init __e820_add_region(struct e820map *e820x, u64 start, u64 size, |
106 | int type) | |
b79cd8f1 | 107 | { |
773e673d | 108 | int x = e820x->nr_map; |
b79cd8f1 | 109 | |
5051fd69 | 110 | if (x >= ARRAY_SIZE(e820x->map)) { |
b79cd8f1 YL |
111 | printk(KERN_ERR "Ooops! Too many entries in the memory map!\n"); |
112 | return; | |
113 | } | |
114 | ||
773e673d YL |
115 | e820x->map[x].addr = start; |
116 | e820x->map[x].size = size; | |
117 | e820x->map[x].type = type; | |
118 | e820x->nr_map++; | |
119 | } | |
120 | ||
121 | void __init e820_add_region(u64 start, u64 size, int type) | |
122 | { | |
123 | __e820_add_region(&e820, start, size, type); | |
b79cd8f1 YL |
124 | } |
125 | ||
c61cf4cf YL |
126 | static void __init e820_print_type(u32 type) |
127 | { | |
128 | switch (type) { | |
129 | case E820_RAM: | |
130 | case E820_RESERVED_KERN: | |
131 | printk(KERN_CONT "(usable)"); | |
132 | break; | |
133 | case E820_RESERVED: | |
134 | printk(KERN_CONT "(reserved)"); | |
135 | break; | |
136 | case E820_ACPI: | |
137 | printk(KERN_CONT "(ACPI data)"); | |
138 | break; | |
139 | case E820_NVS: | |
140 | printk(KERN_CONT "(ACPI NVS)"); | |
141 | break; | |
142 | case E820_UNUSABLE: | |
143 | printk(KERN_CONT "(unusable)"); | |
144 | break; | |
145 | default: | |
146 | printk(KERN_CONT "type %u", type); | |
147 | break; | |
148 | } | |
149 | } | |
150 | ||
b79cd8f1 YL |
151 | void __init e820_print_map(char *who) |
152 | { | |
153 | int i; | |
154 | ||
155 | for (i = 0; i < e820.nr_map; i++) { | |
156 | printk(KERN_INFO " %s: %016Lx - %016Lx ", who, | |
157 | (unsigned long long) e820.map[i].addr, | |
158 | (unsigned long long) | |
159 | (e820.map[i].addr + e820.map[i].size)); | |
c61cf4cf YL |
160 | e820_print_type(e820.map[i].type); |
161 | printk(KERN_CONT "\n"); | |
b79cd8f1 YL |
162 | } |
163 | } | |
164 | ||
165 | /* | |
166 | * Sanitize the BIOS e820 map. | |
167 | * | |
168 | * Some e820 responses include overlapping entries. The following | |
5b7eb2e9 PJ |
169 | * replaces the original e820 map with a new one, removing overlaps, |
170 | * and resolving conflicting memory types in favor of highest | |
171 | * numbered type. | |
b79cd8f1 | 172 | * |
5b7eb2e9 PJ |
173 | * The input parameter biosmap points to an array of 'struct |
174 | * e820entry' which on entry has elements in the range [0, *pnr_map) | |
175 | * valid, and which has space for up to max_nr_map entries. | |
176 | * On return, the resulting sanitized e820 map entries will be in | |
177 | * overwritten in the same location, starting at biosmap. | |
178 | * | |
179 | * The integer pointed to by pnr_map must be valid on entry (the | |
180 | * current number of valid entries located at biosmap) and will | |
181 | * be updated on return, with the new number of valid entries | |
182 | * (something no more than max_nr_map.) | |
183 | * | |
184 | * The return value from sanitize_e820_map() is zero if it | |
185 | * successfully 'sanitized' the map entries passed in, and is -1 | |
186 | * if it did nothing, which can happen if either of (1) it was | |
187 | * only passed one map entry, or (2) any of the input map entries | |
188 | * were invalid (start + size < start, meaning that the size was | |
189 | * so big the described memory range wrapped around through zero.) | |
190 | * | |
191 | * Visually we're performing the following | |
192 | * (1,2,3,4 = memory types)... | |
193 | * | |
194 | * Sample memory map (w/overlaps): | |
195 | * ____22__________________ | |
196 | * ______________________4_ | |
197 | * ____1111________________ | |
198 | * _44_____________________ | |
199 | * 11111111________________ | |
200 | * ____________________33__ | |
201 | * ___________44___________ | |
202 | * __________33333_________ | |
203 | * ______________22________ | |
204 | * ___________________2222_ | |
205 | * _________111111111______ | |
206 | * _____________________11_ | |
207 | * _________________4______ | |
208 | * | |
209 | * Sanitized equivalent (no overlap): | |
210 | * 1_______________________ | |
211 | * _44_____________________ | |
212 | * ___1____________________ | |
213 | * ____22__________________ | |
214 | * ______11________________ | |
215 | * _________1______________ | |
216 | * __________3_____________ | |
217 | * ___________44___________ | |
218 | * _____________33_________ | |
219 | * _______________2________ | |
220 | * ________________1_______ | |
221 | * _________________4______ | |
222 | * ___________________2____ | |
223 | * ____________________33__ | |
224 | * ______________________4_ | |
b79cd8f1 | 225 | */ |
5b7eb2e9 | 226 | |
c3965bd1 | 227 | int __init sanitize_e820_map(struct e820entry *biosmap, int max_nr_map, |
ba639039 | 228 | u32 *pnr_map) |
b79cd8f1 YL |
229 | { |
230 | struct change_member { | |
231 | struct e820entry *pbios; /* pointer to original bios entry */ | |
232 | unsigned long long addr; /* address for this change point */ | |
233 | }; | |
157fabf0 PJ |
234 | static struct change_member change_point_list[2*E820_X_MAX] __initdata; |
235 | static struct change_member *change_point[2*E820_X_MAX] __initdata; | |
236 | static struct e820entry *overlap_list[E820_X_MAX] __initdata; | |
237 | static struct e820entry new_bios[E820_X_MAX] __initdata; | |
b79cd8f1 YL |
238 | struct change_member *change_tmp; |
239 | unsigned long current_type, last_type; | |
240 | unsigned long long last_addr; | |
241 | int chgidx, still_changing; | |
242 | int overlap_entries; | |
243 | int new_bios_entry; | |
244 | int old_nr, new_nr, chg_nr; | |
245 | int i; | |
246 | ||
b79cd8f1 YL |
247 | /* if there's only one memory region, don't bother */ |
248 | if (*pnr_map < 2) | |
249 | return -1; | |
250 | ||
251 | old_nr = *pnr_map; | |
6e9bcc79 | 252 | BUG_ON(old_nr > max_nr_map); |
b79cd8f1 YL |
253 | |
254 | /* bail out if we find any unreasonable addresses in bios map */ | |
255 | for (i = 0; i < old_nr; i++) | |
256 | if (biosmap[i].addr + biosmap[i].size < biosmap[i].addr) | |
257 | return -1; | |
258 | ||
259 | /* create pointers for initial change-point information (for sorting) */ | |
260 | for (i = 0; i < 2 * old_nr; i++) | |
261 | change_point[i] = &change_point_list[i]; | |
262 | ||
263 | /* record all known change-points (starting and ending addresses), | |
264 | omitting those that are for empty memory regions */ | |
265 | chgidx = 0; | |
266 | for (i = 0; i < old_nr; i++) { | |
267 | if (biosmap[i].size != 0) { | |
268 | change_point[chgidx]->addr = biosmap[i].addr; | |
269 | change_point[chgidx++]->pbios = &biosmap[i]; | |
270 | change_point[chgidx]->addr = biosmap[i].addr + | |
271 | biosmap[i].size; | |
272 | change_point[chgidx++]->pbios = &biosmap[i]; | |
273 | } | |
274 | } | |
275 | chg_nr = chgidx; | |
276 | ||
277 | /* sort change-point list by memory addresses (low -> high) */ | |
278 | still_changing = 1; | |
279 | while (still_changing) { | |
280 | still_changing = 0; | |
281 | for (i = 1; i < chg_nr; i++) { | |
282 | unsigned long long curaddr, lastaddr; | |
283 | unsigned long long curpbaddr, lastpbaddr; | |
284 | ||
285 | curaddr = change_point[i]->addr; | |
286 | lastaddr = change_point[i - 1]->addr; | |
287 | curpbaddr = change_point[i]->pbios->addr; | |
288 | lastpbaddr = change_point[i - 1]->pbios->addr; | |
289 | ||
290 | /* | |
291 | * swap entries, when: | |
292 | * | |
293 | * curaddr > lastaddr or | |
294 | * curaddr == lastaddr and curaddr == curpbaddr and | |
295 | * lastaddr != lastpbaddr | |
296 | */ | |
297 | if (curaddr < lastaddr || | |
298 | (curaddr == lastaddr && curaddr == curpbaddr && | |
299 | lastaddr != lastpbaddr)) { | |
300 | change_tmp = change_point[i]; | |
301 | change_point[i] = change_point[i-1]; | |
302 | change_point[i-1] = change_tmp; | |
303 | still_changing = 1; | |
304 | } | |
305 | } | |
306 | } | |
307 | ||
308 | /* create a new bios memory map, removing overlaps */ | |
309 | overlap_entries = 0; /* number of entries in the overlap table */ | |
310 | new_bios_entry = 0; /* index for creating new bios map entries */ | |
311 | last_type = 0; /* start with undefined memory type */ | |
312 | last_addr = 0; /* start with 0 as last starting address */ | |
313 | ||
314 | /* loop through change-points, determining affect on the new bios map */ | |
315 | for (chgidx = 0; chgidx < chg_nr; chgidx++) { | |
316 | /* keep track of all overlapping bios entries */ | |
317 | if (change_point[chgidx]->addr == | |
318 | change_point[chgidx]->pbios->addr) { | |
319 | /* | |
320 | * add map entry to overlap list (> 1 entry | |
321 | * implies an overlap) | |
322 | */ | |
323 | overlap_list[overlap_entries++] = | |
324 | change_point[chgidx]->pbios; | |
325 | } else { | |
326 | /* | |
327 | * remove entry from list (order independent, | |
328 | * so swap with last) | |
329 | */ | |
330 | for (i = 0; i < overlap_entries; i++) { | |
331 | if (overlap_list[i] == | |
332 | change_point[chgidx]->pbios) | |
333 | overlap_list[i] = | |
334 | overlap_list[overlap_entries-1]; | |
335 | } | |
336 | overlap_entries--; | |
337 | } | |
338 | /* | |
339 | * if there are overlapping entries, decide which | |
340 | * "type" to use (larger value takes precedence -- | |
341 | * 1=usable, 2,3,4,4+=unusable) | |
342 | */ | |
343 | current_type = 0; | |
344 | for (i = 0; i < overlap_entries; i++) | |
345 | if (overlap_list[i]->type > current_type) | |
346 | current_type = overlap_list[i]->type; | |
347 | /* | |
348 | * continue building up new bios map based on this | |
349 | * information | |
350 | */ | |
351 | if (current_type != last_type) { | |
352 | if (last_type != 0) { | |
353 | new_bios[new_bios_entry].size = | |
354 | change_point[chgidx]->addr - last_addr; | |
355 | /* | |
356 | * move forward only if the new size | |
357 | * was non-zero | |
358 | */ | |
359 | if (new_bios[new_bios_entry].size != 0) | |
360 | /* | |
361 | * no more space left for new | |
362 | * bios entries ? | |
363 | */ | |
c3965bd1 | 364 | if (++new_bios_entry >= max_nr_map) |
b79cd8f1 YL |
365 | break; |
366 | } | |
367 | if (current_type != 0) { | |
368 | new_bios[new_bios_entry].addr = | |
369 | change_point[chgidx]->addr; | |
370 | new_bios[new_bios_entry].type = current_type; | |
371 | last_addr = change_point[chgidx]->addr; | |
372 | } | |
373 | last_type = current_type; | |
374 | } | |
375 | } | |
376 | /* retain count for new bios entries */ | |
377 | new_nr = new_bios_entry; | |
378 | ||
379 | /* copy new bios mapping into original location */ | |
380 | memcpy(biosmap, new_bios, new_nr * sizeof(struct e820entry)); | |
381 | *pnr_map = new_nr; | |
382 | ||
383 | return 0; | |
384 | } | |
385 | ||
dc8e8120 | 386 | static int __init __append_e820_map(struct e820entry *biosmap, int nr_map) |
8c5beb50 HY |
387 | { |
388 | while (nr_map) { | |
389 | u64 start = biosmap->addr; | |
390 | u64 size = biosmap->size; | |
391 | u64 end = start + size; | |
392 | u32 type = biosmap->type; | |
393 | ||
394 | /* Overflow in 64 bits? Ignore the memory map. */ | |
395 | if (start > end) | |
396 | return -1; | |
397 | ||
398 | e820_add_region(start, size, type); | |
399 | ||
400 | biosmap++; | |
401 | nr_map--; | |
402 | } | |
403 | return 0; | |
404 | } | |
405 | ||
b79cd8f1 YL |
406 | /* |
407 | * Copy the BIOS e820 map into a safe place. | |
408 | * | |
409 | * Sanity-check it while we're at it.. | |
410 | * | |
411 | * If we're lucky and live on a modern system, the setup code | |
412 | * will have given us a memory map that we can use to properly | |
413 | * set up memory. If we aren't, we'll fake a memory map. | |
414 | */ | |
dc8e8120 | 415 | static int __init append_e820_map(struct e820entry *biosmap, int nr_map) |
b79cd8f1 YL |
416 | { |
417 | /* Only one memory region (or negative)? Ignore it */ | |
418 | if (nr_map < 2) | |
419 | return -1; | |
420 | ||
dc8e8120 | 421 | return __append_e820_map(biosmap, nr_map); |
b79cd8f1 YL |
422 | } |
423 | ||
773e673d | 424 | static u64 __init __e820_update_range(struct e820map *e820x, u64 start, |
fc9036ea YL |
425 | u64 size, unsigned old_type, |
426 | unsigned new_type) | |
b79cd8f1 | 427 | { |
78a8b35b | 428 | u64 end; |
773e673d | 429 | unsigned int i; |
b79cd8f1 YL |
430 | u64 real_updated_size = 0; |
431 | ||
432 | BUG_ON(old_type == new_type); | |
433 | ||
232b957a YL |
434 | if (size > (ULLONG_MAX - start)) |
435 | size = ULLONG_MAX - start; | |
436 | ||
78a8b35b | 437 | end = start + size; |
c61cf4cf YL |
438 | printk(KERN_DEBUG "e820 update range: %016Lx - %016Lx ", |
439 | (unsigned long long) start, | |
440 | (unsigned long long) end); | |
441 | e820_print_type(old_type); | |
442 | printk(KERN_CONT " ==> "); | |
443 | e820_print_type(new_type); | |
444 | printk(KERN_CONT "\n"); | |
445 | ||
5c0e6f03 | 446 | for (i = 0; i < e820x->nr_map; i++) { |
fc9036ea | 447 | struct e820entry *ei = &e820x->map[i]; |
b79cd8f1 | 448 | u64 final_start, final_end; |
78a8b35b YL |
449 | u64 ei_end; |
450 | ||
b79cd8f1 YL |
451 | if (ei->type != old_type) |
452 | continue; | |
78a8b35b YL |
453 | |
454 | ei_end = ei->addr + ei->size; | |
455 | /* totally covered by new range? */ | |
456 | if (ei->addr >= start && ei_end <= end) { | |
b79cd8f1 YL |
457 | ei->type = new_type; |
458 | real_updated_size += ei->size; | |
459 | continue; | |
460 | } | |
78a8b35b YL |
461 | |
462 | /* new range is totally covered? */ | |
463 | if (ei->addr < start && ei_end > end) { | |
464 | __e820_add_region(e820x, start, size, new_type); | |
465 | __e820_add_region(e820x, end, ei_end - end, ei->type); | |
466 | ei->size = start - ei->addr; | |
467 | real_updated_size += size; | |
468 | continue; | |
469 | } | |
470 | ||
b79cd8f1 YL |
471 | /* partially covered */ |
472 | final_start = max(start, ei->addr); | |
78a8b35b | 473 | final_end = min(end, ei_end); |
b79cd8f1 YL |
474 | if (final_start >= final_end) |
475 | continue; | |
5c0e6f03 | 476 | |
773e673d YL |
477 | __e820_add_region(e820x, final_start, final_end - final_start, |
478 | new_type); | |
5c0e6f03 | 479 | |
b79cd8f1 | 480 | real_updated_size += final_end - final_start; |
976dd4dc | 481 | |
773e673d YL |
482 | /* |
483 | * left range could be head or tail, so need to update | |
484 | * size at first. | |
485 | */ | |
486 | ei->size -= final_end - final_start; | |
976dd4dc YL |
487 | if (ei->addr < final_start) |
488 | continue; | |
489 | ei->addr = final_end; | |
b79cd8f1 YL |
490 | } |
491 | return real_updated_size; | |
492 | } | |
493 | ||
fc9036ea YL |
494 | u64 __init e820_update_range(u64 start, u64 size, unsigned old_type, |
495 | unsigned new_type) | |
496 | { | |
773e673d | 497 | return __e820_update_range(&e820, start, size, old_type, new_type); |
fc9036ea YL |
498 | } |
499 | ||
500 | static u64 __init e820_update_range_saved(u64 start, u64 size, | |
501 | unsigned old_type, unsigned new_type) | |
502 | { | |
773e673d | 503 | return __e820_update_range(&e820_saved, start, size, old_type, |
fc9036ea YL |
504 | new_type); |
505 | } | |
506 | ||
7a1fd986 YL |
507 | /* make e820 not cover the range */ |
508 | u64 __init e820_remove_range(u64 start, u64 size, unsigned old_type, | |
509 | int checktype) | |
510 | { | |
511 | int i; | |
1b5576e6 | 512 | u64 end; |
7a1fd986 YL |
513 | u64 real_removed_size = 0; |
514 | ||
232b957a YL |
515 | if (size > (ULLONG_MAX - start)) |
516 | size = ULLONG_MAX - start; | |
517 | ||
1b5576e6 YL |
518 | end = start + size; |
519 | printk(KERN_DEBUG "e820 remove range: %016Lx - %016Lx ", | |
520 | (unsigned long long) start, | |
521 | (unsigned long long) end); | |
9f3a5f52 YL |
522 | if (checktype) |
523 | e820_print_type(old_type); | |
1b5576e6 YL |
524 | printk(KERN_CONT "\n"); |
525 | ||
7a1fd986 YL |
526 | for (i = 0; i < e820.nr_map; i++) { |
527 | struct e820entry *ei = &e820.map[i]; | |
528 | u64 final_start, final_end; | |
9f3a5f52 | 529 | u64 ei_end; |
7a1fd986 YL |
530 | |
531 | if (checktype && ei->type != old_type) | |
532 | continue; | |
9f3a5f52 YL |
533 | |
534 | ei_end = ei->addr + ei->size; | |
7a1fd986 | 535 | /* totally covered? */ |
9f3a5f52 | 536 | if (ei->addr >= start && ei_end <= end) { |
7a1fd986 YL |
537 | real_removed_size += ei->size; |
538 | memset(ei, 0, sizeof(struct e820entry)); | |
539 | continue; | |
540 | } | |
9f3a5f52 YL |
541 | |
542 | /* new range is totally covered? */ | |
543 | if (ei->addr < start && ei_end > end) { | |
544 | e820_add_region(end, ei_end - end, ei->type); | |
545 | ei->size = start - ei->addr; | |
546 | real_removed_size += size; | |
547 | continue; | |
548 | } | |
549 | ||
7a1fd986 YL |
550 | /* partially covered */ |
551 | final_start = max(start, ei->addr); | |
9f3a5f52 | 552 | final_end = min(end, ei_end); |
7a1fd986 YL |
553 | if (final_start >= final_end) |
554 | continue; | |
555 | real_removed_size += final_end - final_start; | |
556 | ||
9f3a5f52 YL |
557 | /* |
558 | * left range could be head or tail, so need to update | |
559 | * size at first. | |
560 | */ | |
7a1fd986 YL |
561 | ei->size -= final_end - final_start; |
562 | if (ei->addr < final_start) | |
563 | continue; | |
564 | ei->addr = final_end; | |
565 | } | |
566 | return real_removed_size; | |
567 | } | |
568 | ||
b79cd8f1 YL |
569 | void __init update_e820(void) |
570 | { | |
ba639039 | 571 | u32 nr_map; |
b79cd8f1 YL |
572 | |
573 | nr_map = e820.nr_map; | |
c3965bd1 | 574 | if (sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &nr_map)) |
b79cd8f1 YL |
575 | return; |
576 | e820.nr_map = nr_map; | |
577 | printk(KERN_INFO "modified physical RAM map:\n"); | |
578 | e820_print_map("modified"); | |
579 | } | |
fc9036ea YL |
580 | static void __init update_e820_saved(void) |
581 | { | |
ba639039 | 582 | u32 nr_map; |
fc9036ea YL |
583 | |
584 | nr_map = e820_saved.nr_map; | |
585 | if (sanitize_e820_map(e820_saved.map, ARRAY_SIZE(e820_saved.map), &nr_map)) | |
586 | return; | |
587 | e820_saved.nr_map = nr_map; | |
588 | } | |
fd6493e1 | 589 | #define MAX_GAP_END 0x100000000ull |
b79cd8f1 | 590 | /* |
fd6493e1 | 591 | * Search for a gap in the e820 memory space from start_addr to end_addr. |
b79cd8f1 | 592 | */ |
3381959d | 593 | __init int e820_search_gap(unsigned long *gapstart, unsigned long *gapsize, |
fd6493e1 | 594 | unsigned long start_addr, unsigned long long end_addr) |
b79cd8f1 | 595 | { |
fd6493e1 | 596 | unsigned long long last; |
3381959d | 597 | int i = e820.nr_map; |
b79cd8f1 YL |
598 | int found = 0; |
599 | ||
fd6493e1 AK |
600 | last = (end_addr && end_addr < MAX_GAP_END) ? end_addr : MAX_GAP_END; |
601 | ||
b79cd8f1 YL |
602 | while (--i >= 0) { |
603 | unsigned long long start = e820.map[i].addr; | |
604 | unsigned long long end = start + e820.map[i].size; | |
605 | ||
3381959d AK |
606 | if (end < start_addr) |
607 | continue; | |
608 | ||
b79cd8f1 YL |
609 | /* |
610 | * Since "last" is at most 4GB, we know we'll | |
611 | * fit in 32 bits if this condition is true | |
612 | */ | |
613 | if (last > end) { | |
614 | unsigned long gap = last - end; | |
615 | ||
3381959d AK |
616 | if (gap >= *gapsize) { |
617 | *gapsize = gap; | |
618 | *gapstart = end; | |
b79cd8f1 YL |
619 | found = 1; |
620 | } | |
621 | } | |
622 | if (start < last) | |
623 | last = start; | |
624 | } | |
3381959d AK |
625 | return found; |
626 | } | |
627 | ||
628 | /* | |
629 | * Search for the biggest gap in the low 32 bits of the e820 | |
630 | * memory space. We pass this space to PCI to assign MMIO resources | |
631 | * for hotplug or unconfigured devices in. | |
632 | * Hopefully the BIOS let enough space left. | |
633 | */ | |
634 | __init void e820_setup_gap(void) | |
635 | { | |
5d423ccd | 636 | unsigned long gapstart, gapsize; |
3381959d AK |
637 | int found; |
638 | ||
639 | gapstart = 0x10000000; | |
640 | gapsize = 0x400000; | |
fd6493e1 | 641 | found = e820_search_gap(&gapstart, &gapsize, 0, MAX_GAP_END); |
b79cd8f1 YL |
642 | |
643 | #ifdef CONFIG_X86_64 | |
644 | if (!found) { | |
c987d12f | 645 | gapstart = (max_pfn << PAGE_SHIFT) + 1024*1024; |
ad361c98 JP |
646 | printk(KERN_ERR |
647 | "PCI: Warning: Cannot find a gap in the 32bit address range\n" | |
648 | "PCI: Unassigned devices with 32bit resource registers may break!\n"); | |
b79cd8f1 YL |
649 | } |
650 | #endif | |
651 | ||
652 | /* | |
5d423ccd | 653 | * e820_reserve_resources_late protect stolen RAM already |
b79cd8f1 | 654 | */ |
5d423ccd | 655 | pci_mem_start = gapstart; |
b79cd8f1 YL |
656 | |
657 | printk(KERN_INFO | |
658 | "Allocating PCI resources starting at %lx (gap: %lx:%lx)\n", | |
659 | pci_mem_start, gapstart, gapsize); | |
660 | } | |
661 | ||
8c5beb50 HY |
662 | /** |
663 | * Because of the size limitation of struct boot_params, only first | |
664 | * 128 E820 memory entries are passed to kernel via | |
665 | * boot_params.e820_map, others are passed via SETUP_E820_EXT node of | |
666 | * linked list of struct setup_data, which is parsed here. | |
667 | */ | |
668 | void __init parse_e820_ext(struct setup_data *sdata, unsigned long pa_data) | |
669 | { | |
670 | u32 map_len; | |
671 | int entries; | |
672 | struct e820entry *extmap; | |
673 | ||
674 | entries = sdata->len / sizeof(struct e820entry); | |
675 | map_len = sdata->len + sizeof(struct setup_data); | |
676 | if (map_len > PAGE_SIZE) | |
677 | sdata = early_ioremap(pa_data, map_len); | |
678 | extmap = (struct e820entry *)(sdata->data); | |
dc8e8120 | 679 | __append_e820_map(extmap, entries); |
8c5beb50 HY |
680 | sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map); |
681 | if (map_len > PAGE_SIZE) | |
682 | early_iounmap(sdata, map_len); | |
683 | printk(KERN_INFO "extended physical RAM map:\n"); | |
684 | e820_print_map("extended"); | |
685 | } | |
686 | ||
bf62f398 YL |
687 | #if defined(CONFIG_X86_64) || \ |
688 | (defined(CONFIG_X86_32) && defined(CONFIG_HIBERNATION)) | |
689 | /** | |
690 | * Find the ranges of physical addresses that do not correspond to | |
691 | * e820 RAM areas and mark the corresponding pages as nosave for | |
692 | * hibernation (32 bit) or software suspend and suspend to RAM (64 bit). | |
693 | * | |
694 | * This function requires the e820 map to be sorted and without any | |
695 | * overlapping entries and assumes the first e820 area to be RAM. | |
696 | */ | |
697 | void __init e820_mark_nosave_regions(unsigned long limit_pfn) | |
698 | { | |
699 | int i; | |
700 | unsigned long pfn; | |
701 | ||
702 | pfn = PFN_DOWN(e820.map[0].addr + e820.map[0].size); | |
703 | for (i = 1; i < e820.nr_map; i++) { | |
704 | struct e820entry *ei = &e820.map[i]; | |
705 | ||
706 | if (pfn < PFN_UP(ei->addr)) | |
707 | register_nosave_region(pfn, PFN_UP(ei->addr)); | |
708 | ||
709 | pfn = PFN_DOWN(ei->addr + ei->size); | |
28bb2237 | 710 | if (ei->type != E820_RAM && ei->type != E820_RESERVED_KERN) |
bf62f398 YL |
711 | register_nosave_region(PFN_UP(ei->addr), pfn); |
712 | ||
713 | if (pfn >= limit_pfn) | |
714 | break; | |
715 | } | |
716 | } | |
717 | #endif | |
a4c81cf6 | 718 | |
b69edc76 RW |
719 | #ifdef CONFIG_HIBERNATION |
720 | /** | |
721 | * Mark ACPI NVS memory region, so that we can save/restore it during | |
722 | * hibernation and the subsequent resume. | |
723 | */ | |
724 | static int __init e820_mark_nvs_memory(void) | |
725 | { | |
726 | int i; | |
727 | ||
728 | for (i = 0; i < e820.nr_map; i++) { | |
729 | struct e820entry *ei = &e820.map[i]; | |
730 | ||
731 | if (ei->type == E820_NVS) | |
dd4c4f17 | 732 | suspend_nvs_register(ei->addr, ei->size); |
b69edc76 RW |
733 | } |
734 | ||
735 | return 0; | |
736 | } | |
737 | core_initcall(e820_mark_nvs_memory); | |
738 | #endif | |
739 | ||
efdd0e81 YL |
740 | /* |
741 | * Find a free area with specified alignment in a specific range. | |
742 | */ | |
743 | u64 __init find_e820_area(u64 start, u64 end, u64 size, u64 align) | |
744 | { | |
745 | int i; | |
746 | ||
747 | for (i = 0; i < e820.nr_map; i++) { | |
748 | struct e820entry *ei = &e820.map[i]; | |
749 | u64 addr; | |
750 | u64 ei_start, ei_last; | |
751 | ||
752 | if (ei->type != E820_RAM) | |
753 | continue; | |
754 | ||
755 | ei_last = ei->addr + ei->size; | |
756 | ei_start = ei->addr; | |
757 | addr = find_early_area(ei_start, ei_last, start, end, | |
758 | size, align); | |
759 | ||
760 | if (addr != -1ULL) | |
761 | return addr; | |
762 | } | |
763 | return -1ULL; | |
764 | } | |
765 | ||
dd645cee YL |
766 | u64 __init find_fw_memmap_area(u64 start, u64 end, u64 size, u64 align) |
767 | { | |
768 | return find_e820_area(start, end, size, align); | |
769 | } | |
580e0ad2 YL |
770 | |
771 | u64 __init get_max_mapped(void) | |
772 | { | |
773 | u64 end = max_pfn_mapped; | |
774 | ||
775 | end <<= PAGE_SHIFT; | |
776 | ||
777 | return end; | |
778 | } | |
efdd0e81 YL |
779 | /* |
780 | * Find next free range after *start | |
781 | */ | |
782 | u64 __init find_e820_area_size(u64 start, u64 *sizep, u64 align) | |
783 | { | |
784 | int i; | |
785 | ||
786 | for (i = 0; i < e820.nr_map; i++) { | |
787 | struct e820entry *ei = &e820.map[i]; | |
788 | u64 addr; | |
789 | u64 ei_start, ei_last; | |
790 | ||
791 | if (ei->type != E820_RAM) | |
792 | continue; | |
793 | ||
794 | ei_last = ei->addr + ei->size; | |
795 | ei_start = ei->addr; | |
796 | addr = find_early_area_size(ei_start, ei_last, start, | |
797 | sizep, align); | |
798 | ||
799 | if (addr != -1ULL) | |
800 | return addr; | |
801 | } | |
802 | ||
803 | return -1ULL; | |
804 | } | |
805 | ||
2944e16b YL |
806 | /* |
807 | * pre allocated 4k and reserved it in e820 | |
808 | */ | |
809 | u64 __init early_reserve_e820(u64 startt, u64 sizet, u64 align) | |
810 | { | |
811 | u64 size = 0; | |
812 | u64 addr; | |
813 | u64 start; | |
814 | ||
61438766 | 815 | for (start = startt; ; start += size) { |
2944e16b | 816 | start = find_e820_area_size(start, &size, align); |
61438766 JB |
817 | if (!(start + 1)) |
818 | return 0; | |
819 | if (size >= sizet) | |
820 | break; | |
821 | } | |
2944e16b | 822 | |
5c0e6f03 JB |
823 | #ifdef CONFIG_X86_32 |
824 | if (start >= MAXMEM) | |
825 | return 0; | |
826 | if (start + size > MAXMEM) | |
827 | size = MAXMEM - start; | |
828 | #endif | |
829 | ||
2944e16b | 830 | addr = round_down(start + size - sizet, align); |
5c0e6f03 JB |
831 | if (addr < start) |
832 | return 0; | |
d0be6bde | 833 | e820_update_range(addr, sizet, E820_RAM, E820_RESERVED); |
fc9036ea | 834 | e820_update_range_saved(addr, sizet, E820_RAM, E820_RESERVED); |
2944e16b YL |
835 | printk(KERN_INFO "update e820 for early_reserve_e820\n"); |
836 | update_e820(); | |
fc9036ea | 837 | update_e820_saved(); |
2944e16b YL |
838 | |
839 | return addr; | |
840 | } | |
841 | ||
ee0c80fa YL |
842 | #ifdef CONFIG_X86_32 |
843 | # ifdef CONFIG_X86_PAE | |
844 | # define MAX_ARCH_PFN (1ULL<<(36-PAGE_SHIFT)) | |
845 | # else | |
846 | # define MAX_ARCH_PFN (1ULL<<(32-PAGE_SHIFT)) | |
847 | # endif | |
848 | #else /* CONFIG_X86_32 */ | |
bd70e522 | 849 | # define MAX_ARCH_PFN MAXMEM>>PAGE_SHIFT |
ee0c80fa YL |
850 | #endif |
851 | ||
ee0c80fa YL |
852 | /* |
853 | * Find the highest page frame number we have available | |
854 | */ | |
f361a450 | 855 | static unsigned long __init e820_end_pfn(unsigned long limit_pfn, unsigned type) |
ee0c80fa | 856 | { |
2dc807b3 YL |
857 | int i; |
858 | unsigned long last_pfn = 0; | |
ee0c80fa YL |
859 | unsigned long max_arch_pfn = MAX_ARCH_PFN; |
860 | ||
2dc807b3 YL |
861 | for (i = 0; i < e820.nr_map; i++) { |
862 | struct e820entry *ei = &e820.map[i]; | |
f361a450 | 863 | unsigned long start_pfn; |
2dc807b3 YL |
864 | unsigned long end_pfn; |
865 | ||
f361a450 | 866 | if (ei->type != type) |
c22d4c18 | 867 | continue; |
c22d4c18 | 868 | |
f361a450 | 869 | start_pfn = ei->addr >> PAGE_SHIFT; |
2dc807b3 | 870 | end_pfn = (ei->addr + ei->size) >> PAGE_SHIFT; |
f361a450 YL |
871 | |
872 | if (start_pfn >= limit_pfn) | |
873 | continue; | |
874 | if (end_pfn > limit_pfn) { | |
875 | last_pfn = limit_pfn; | |
876 | break; | |
877 | } | |
2dc807b3 YL |
878 | if (end_pfn > last_pfn) |
879 | last_pfn = end_pfn; | |
880 | } | |
ee0c80fa YL |
881 | |
882 | if (last_pfn > max_arch_pfn) | |
883 | last_pfn = max_arch_pfn; | |
ee0c80fa | 884 | |
5dab8ec1 | 885 | printk(KERN_INFO "last_pfn = %#lx max_arch_pfn = %#lx\n", |
ee0c80fa YL |
886 | last_pfn, max_arch_pfn); |
887 | return last_pfn; | |
888 | } | |
f361a450 YL |
889 | unsigned long __init e820_end_of_ram_pfn(void) |
890 | { | |
891 | return e820_end_pfn(MAX_ARCH_PFN, E820_RAM); | |
892 | } | |
ee0c80fa | 893 | |
f361a450 YL |
894 | unsigned long __init e820_end_of_low_ram_pfn(void) |
895 | { | |
896 | return e820_end_pfn(1UL<<(32 - PAGE_SHIFT), E820_RAM); | |
897 | } | |
ee0c80fa YL |
898 | /* |
899 | * Finds an active region in the address range from start_pfn to last_pfn and | |
900 | * returns its range in ei_startpfn and ei_endpfn for the e820 entry. | |
901 | */ | |
902 | int __init e820_find_active_region(const struct e820entry *ei, | |
903 | unsigned long start_pfn, | |
904 | unsigned long last_pfn, | |
905 | unsigned long *ei_startpfn, | |
906 | unsigned long *ei_endpfn) | |
907 | { | |
908 | u64 align = PAGE_SIZE; | |
909 | ||
910 | *ei_startpfn = round_up(ei->addr, align) >> PAGE_SHIFT; | |
911 | *ei_endpfn = round_down(ei->addr + ei->size, align) >> PAGE_SHIFT; | |
912 | ||
913 | /* Skip map entries smaller than a page */ | |
914 | if (*ei_startpfn >= *ei_endpfn) | |
915 | return 0; | |
916 | ||
917 | /* Skip if map is outside the node */ | |
918 | if (ei->type != E820_RAM || *ei_endpfn <= start_pfn || | |
919 | *ei_startpfn >= last_pfn) | |
920 | return 0; | |
921 | ||
922 | /* Check for overlaps */ | |
923 | if (*ei_startpfn < start_pfn) | |
924 | *ei_startpfn = start_pfn; | |
925 | if (*ei_endpfn > last_pfn) | |
926 | *ei_endpfn = last_pfn; | |
927 | ||
ee0c80fa YL |
928 | return 1; |
929 | } | |
930 | ||
931 | /* Walk the e820 map and register active regions within a node */ | |
932 | void __init e820_register_active_regions(int nid, unsigned long start_pfn, | |
933 | unsigned long last_pfn) | |
934 | { | |
935 | unsigned long ei_startpfn; | |
936 | unsigned long ei_endpfn; | |
937 | int i; | |
938 | ||
939 | for (i = 0; i < e820.nr_map; i++) | |
940 | if (e820_find_active_region(&e820.map[i], | |
941 | start_pfn, last_pfn, | |
942 | &ei_startpfn, &ei_endpfn)) | |
943 | add_active_range(nid, ei_startpfn, ei_endpfn); | |
944 | } | |
945 | ||
946 | /* | |
947 | * Find the hole size (in bytes) in the memory range. | |
948 | * @start: starting address of the memory range to scan | |
949 | * @end: ending address of the memory range to scan | |
950 | */ | |
951 | u64 __init e820_hole_size(u64 start, u64 end) | |
952 | { | |
953 | unsigned long start_pfn = start >> PAGE_SHIFT; | |
954 | unsigned long last_pfn = end >> PAGE_SHIFT; | |
955 | unsigned long ei_startpfn, ei_endpfn, ram = 0; | |
956 | int i; | |
957 | ||
958 | for (i = 0; i < e820.nr_map; i++) { | |
959 | if (e820_find_active_region(&e820.map[i], | |
960 | start_pfn, last_pfn, | |
961 | &ei_startpfn, &ei_endpfn)) | |
962 | ram += ei_endpfn - ei_startpfn; | |
963 | } | |
964 | return end - start - ((u64)ram << PAGE_SHIFT); | |
965 | } | |
ab4a465e YL |
966 | |
967 | static void early_panic(char *msg) | |
968 | { | |
969 | early_printk(msg); | |
970 | panic(msg); | |
971 | } | |
972 | ||
69a7704d YL |
973 | static int userdef __initdata; |
974 | ||
ab4a465e YL |
975 | /* "mem=nopentium" disables the 4MB page tables. */ |
976 | static int __init parse_memopt(char *p) | |
977 | { | |
978 | u64 mem_size; | |
979 | ||
980 | if (!p) | |
981 | return -EINVAL; | |
982 | ||
983 | #ifdef CONFIG_X86_32 | |
984 | if (!strcmp(p, "nopentium")) { | |
985 | setup_clear_cpu_cap(X86_FEATURE_PSE); | |
986 | return 0; | |
987 | } | |
988 | #endif | |
989 | ||
69a7704d | 990 | userdef = 1; |
ab4a465e | 991 | mem_size = memparse(p, &p); |
69a7704d | 992 | e820_remove_range(mem_size, ULLONG_MAX - mem_size, E820_RAM, 1); |
611dfd78 | 993 | |
ab4a465e YL |
994 | return 0; |
995 | } | |
996 | early_param("mem", parse_memopt); | |
997 | ||
ab4a465e YL |
998 | static int __init parse_memmap_opt(char *p) |
999 | { | |
1000 | char *oldp; | |
1001 | u64 start_at, mem_size; | |
1002 | ||
a737abd1 CG |
1003 | if (!p) |
1004 | return -EINVAL; | |
1005 | ||
d6be118a | 1006 | if (!strncmp(p, "exactmap", 8)) { |
ab4a465e YL |
1007 | #ifdef CONFIG_CRASH_DUMP |
1008 | /* | |
1009 | * If we are doing a crash dump, we still need to know | |
1010 | * the real mem size before original memory map is | |
1011 | * reset. | |
1012 | */ | |
f361a450 | 1013 | saved_max_pfn = e820_end_of_ram_pfn(); |
ab4a465e YL |
1014 | #endif |
1015 | e820.nr_map = 0; | |
1016 | userdef = 1; | |
1017 | return 0; | |
1018 | } | |
1019 | ||
1020 | oldp = p; | |
1021 | mem_size = memparse(p, &p); | |
1022 | if (p == oldp) | |
1023 | return -EINVAL; | |
1024 | ||
1025 | userdef = 1; | |
1026 | if (*p == '@') { | |
1027 | start_at = memparse(p+1, &p); | |
d0be6bde | 1028 | e820_add_region(start_at, mem_size, E820_RAM); |
ab4a465e YL |
1029 | } else if (*p == '#') { |
1030 | start_at = memparse(p+1, &p); | |
d0be6bde | 1031 | e820_add_region(start_at, mem_size, E820_ACPI); |
ab4a465e YL |
1032 | } else if (*p == '$') { |
1033 | start_at = memparse(p+1, &p); | |
d0be6bde | 1034 | e820_add_region(start_at, mem_size, E820_RESERVED); |
7b479bec | 1035 | } else |
69a7704d | 1036 | e820_remove_range(mem_size, ULLONG_MAX - mem_size, E820_RAM, 1); |
7b479bec | 1037 | |
ab4a465e YL |
1038 | return *p == '\0' ? 0 : -EINVAL; |
1039 | } | |
1040 | early_param("memmap", parse_memmap_opt); | |
1041 | ||
1042 | void __init finish_e820_parsing(void) | |
1043 | { | |
1044 | if (userdef) { | |
ba639039 | 1045 | u32 nr = e820.nr_map; |
ab4a465e YL |
1046 | |
1047 | if (sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &nr) < 0) | |
1048 | early_panic("Invalid user supplied memory map"); | |
1049 | e820.nr_map = nr; | |
1050 | ||
1051 | printk(KERN_INFO "user-defined physical RAM map:\n"); | |
1052 | e820_print_map("user"); | |
1053 | } | |
1054 | } | |
41c094fd | 1055 | |
5dfcf14d BW |
1056 | static inline const char *e820_type_to_string(int e820_type) |
1057 | { | |
1058 | switch (e820_type) { | |
1059 | case E820_RESERVED_KERN: | |
1060 | case E820_RAM: return "System RAM"; | |
1061 | case E820_ACPI: return "ACPI Tables"; | |
1062 | case E820_NVS: return "ACPI Non-volatile Storage"; | |
671eef85 | 1063 | case E820_UNUSABLE: return "Unusable memory"; |
5dfcf14d BW |
1064 | default: return "reserved"; |
1065 | } | |
1066 | } | |
1067 | ||
41c094fd YL |
1068 | /* |
1069 | * Mark e820 reserved areas as busy for the resource manager. | |
1070 | */ | |
a5444d15 | 1071 | static struct resource __initdata *e820_res; |
41c094fd YL |
1072 | void __init e820_reserve_resources(void) |
1073 | { | |
1074 | int i; | |
58f7c988 | 1075 | struct resource *res; |
a5444d15 | 1076 | u64 end; |
41c094fd | 1077 | |
3c1596ef | 1078 | res = alloc_bootmem(sizeof(struct resource) * e820.nr_map); |
58f7c988 | 1079 | e820_res = res; |
41c094fd | 1080 | for (i = 0; i < e820.nr_map; i++) { |
b4df32f4 | 1081 | end = e820.map[i].addr + e820.map[i].size - 1; |
8308c54d | 1082 | if (end != (resource_size_t)end) { |
41c094fd YL |
1083 | res++; |
1084 | continue; | |
1085 | } | |
5dfcf14d | 1086 | res->name = e820_type_to_string(e820.map[i].type); |
b4df32f4 YL |
1087 | res->start = e820.map[i].addr; |
1088 | res->end = end; | |
1089 | ||
1f987577 | 1090 | res->flags = IORESOURCE_MEM; |
a5444d15 IM |
1091 | |
1092 | /* | |
1093 | * don't register the region that could be conflicted with | |
1094 | * pci device BAR resource and insert them later in | |
1095 | * pcibios_resource_survey() | |
1096 | */ | |
1f987577 LT |
1097 | if (e820.map[i].type != E820_RESERVED || res->start < (1ULL<<20)) { |
1098 | res->flags |= IORESOURCE_BUSY; | |
58f7c988 | 1099 | insert_resource(&iomem_resource, res); |
1f987577 | 1100 | } |
41c094fd YL |
1101 | res++; |
1102 | } | |
5dfcf14d BW |
1103 | |
1104 | for (i = 0; i < e820_saved.nr_map; i++) { | |
1105 | struct e820entry *entry = &e820_saved.map[i]; | |
1106 | firmware_map_add_early(entry->addr, | |
1107 | entry->addr + entry->size - 1, | |
1108 | e820_type_to_string(entry->type)); | |
1109 | } | |
41c094fd YL |
1110 | } |
1111 | ||
45fbe3ee LT |
1112 | /* How much should we pad RAM ending depending on where it is? */ |
1113 | static unsigned long ram_alignment(resource_size_t pos) | |
1114 | { | |
1115 | unsigned long mb = pos >> 20; | |
1116 | ||
1117 | /* To 64kB in the first megabyte */ | |
1118 | if (!mb) | |
1119 | return 64*1024; | |
1120 | ||
1121 | /* To 1MB in the first 16MB */ | |
1122 | if (mb < 16) | |
1123 | return 1024*1024; | |
1124 | ||
15b812f1 YL |
1125 | /* To 64MB for anything above that */ |
1126 | return 64*1024*1024; | |
45fbe3ee LT |
1127 | } |
1128 | ||
7c5371c4 YL |
1129 | #define MAX_RESOURCE_SIZE ((resource_size_t)-1) |
1130 | ||
58f7c988 YL |
1131 | void __init e820_reserve_resources_late(void) |
1132 | { | |
1133 | int i; | |
1134 | struct resource *res; | |
1135 | ||
1136 | res = e820_res; | |
1137 | for (i = 0; i < e820.nr_map; i++) { | |
a5444d15 | 1138 | if (!res->parent && res->end) |
1f987577 | 1139 | insert_resource_expand_to_fit(&iomem_resource, res); |
58f7c988 YL |
1140 | res++; |
1141 | } | |
45fbe3ee LT |
1142 | |
1143 | /* | |
1144 | * Try to bump up RAM regions to reasonable boundaries to | |
1145 | * avoid stolen RAM: | |
1146 | */ | |
1147 | for (i = 0; i < e820.nr_map; i++) { | |
7c5371c4 YL |
1148 | struct e820entry *entry = &e820.map[i]; |
1149 | u64 start, end; | |
45fbe3ee LT |
1150 | |
1151 | if (entry->type != E820_RAM) | |
1152 | continue; | |
1153 | start = entry->addr + entry->size; | |
7c5371c4 YL |
1154 | end = round_up(start, ram_alignment(start)) - 1; |
1155 | if (end > MAX_RESOURCE_SIZE) | |
1156 | end = MAX_RESOURCE_SIZE; | |
1157 | if (start >= end) | |
45fbe3ee | 1158 | continue; |
79c60169 YL |
1159 | printk(KERN_DEBUG "reserve RAM buffer: %016llx - %016llx ", |
1160 | start, end); | |
7c5371c4 YL |
1161 | reserve_region_with_split(&iomem_resource, start, end, |
1162 | "RAM buffer"); | |
45fbe3ee | 1163 | } |
58f7c988 YL |
1164 | } |
1165 | ||
95a71a45 | 1166 | char *__init default_machine_specific_memory_setup(void) |
064d25f1 YL |
1167 | { |
1168 | char *who = "BIOS-e820"; | |
ba639039 | 1169 | u32 new_nr; |
064d25f1 YL |
1170 | /* |
1171 | * Try to copy the BIOS-supplied E820-map. | |
1172 | * | |
1173 | * Otherwise fake a memory map; one section from 0k->640k, | |
1174 | * the next section from 1mb->appropriate_mem_k | |
1175 | */ | |
1176 | new_nr = boot_params.e820_entries; | |
1177 | sanitize_e820_map(boot_params.e820_map, | |
1178 | ARRAY_SIZE(boot_params.e820_map), | |
1179 | &new_nr); | |
1180 | boot_params.e820_entries = new_nr; | |
dc8e8120 YL |
1181 | if (append_e820_map(boot_params.e820_map, boot_params.e820_entries) |
1182 | < 0) { | |
95a71a45 | 1183 | u64 mem_size; |
064d25f1 YL |
1184 | |
1185 | /* compare results from other methods and take the greater */ | |
1186 | if (boot_params.alt_mem_k | |
1187 | < boot_params.screen_info.ext_mem_k) { | |
1188 | mem_size = boot_params.screen_info.ext_mem_k; | |
1189 | who = "BIOS-88"; | |
1190 | } else { | |
1191 | mem_size = boot_params.alt_mem_k; | |
1192 | who = "BIOS-e801"; | |
1193 | } | |
1194 | ||
1195 | e820.nr_map = 0; | |
1196 | e820_add_region(0, LOWMEMSIZE(), E820_RAM); | |
1197 | e820_add_region(HIGH_MEMORY, mem_size << 10, E820_RAM); | |
064d25f1 YL |
1198 | } |
1199 | ||
1200 | /* In case someone cares... */ | |
1201 | return who; | |
1202 | } | |
1203 | ||
064d25f1 YL |
1204 | void __init setup_memory_map(void) |
1205 | { | |
0be15526 YL |
1206 | char *who; |
1207 | ||
6b18ae3e | 1208 | who = x86_init.resources.memory_setup(); |
0be15526 | 1209 | memcpy(&e820_saved, &e820, sizeof(struct e820map)); |
064d25f1 | 1210 | printk(KERN_INFO "BIOS-provided physical RAM map:\n"); |
0be15526 | 1211 | e820_print_map(who); |
064d25f1 | 1212 | } |