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 | 26 | #include <asm/setup.h> |
cd4d09ec | 27 | #include <asm/cpufeature.h> |
b79cd8f1 | 28 | |
5dfcf14d BW |
29 | /* |
30 | * The e820 map is the map that gets modified e.g. with command line parameters | |
31 | * and that is also registered with modifications in the kernel resource tree | |
32 | * with the iomem_resource as parent. | |
33 | * | |
34 | * The e820_saved is directly saved after the BIOS-provided memory map is | |
35 | * copied. It doesn't get modified afterwards. It's registered for the | |
36 | * /sys/firmware/memmap interface. | |
37 | * | |
38 | * That memory map is not modified and is used as base for kexec. The kexec'd | |
39 | * kernel should get the same memory map as the firmware provides. Then the | |
40 | * user can e.g. boot the original kernel with mem=1G while still booting the | |
41 | * next kernel with full memory. | |
42 | */ | |
b79cd8f1 | 43 | struct e820map e820; |
5dfcf14d | 44 | struct e820map e820_saved; |
b79cd8f1 YL |
45 | |
46 | /* For PCI or other memory-mapped resources */ | |
47 | unsigned long pci_mem_start = 0xaeedbabe; | |
48 | #ifdef CONFIG_PCI | |
49 | EXPORT_SYMBOL(pci_mem_start); | |
50 | #endif | |
51 | ||
52 | /* | |
53 | * This function checks if any part of the range <start,end> is mapped | |
54 | * with type. | |
55 | */ | |
56 | int | |
57 | e820_any_mapped(u64 start, u64 end, unsigned type) | |
58 | { | |
59 | int i; | |
60 | ||
61 | for (i = 0; i < e820.nr_map; i++) { | |
62 | struct e820entry *ei = &e820.map[i]; | |
63 | ||
64 | if (type && ei->type != type) | |
65 | continue; | |
66 | if (ei->addr >= end || ei->addr + ei->size <= start) | |
67 | continue; | |
68 | return 1; | |
69 | } | |
70 | return 0; | |
71 | } | |
72 | EXPORT_SYMBOL_GPL(e820_any_mapped); | |
73 | ||
74 | /* | |
75 | * This function checks if the entire range <start,end> is mapped with type. | |
76 | * | |
77 | * Note: this function only works correct if the e820 table is sorted and | |
78 | * not-overlapping, which is the case | |
79 | */ | |
80 | int __init e820_all_mapped(u64 start, u64 end, unsigned type) | |
81 | { | |
82 | int i; | |
83 | ||
84 | for (i = 0; i < e820.nr_map; i++) { | |
85 | struct e820entry *ei = &e820.map[i]; | |
86 | ||
87 | if (type && ei->type != type) | |
88 | continue; | |
89 | /* is the region (part) in overlap with the current region ?*/ | |
90 | if (ei->addr >= end || ei->addr + ei->size <= start) | |
91 | continue; | |
92 | ||
93 | /* if the region is at the beginning of <start,end> we move | |
94 | * start to the end of the region since it's ok until there | |
95 | */ | |
96 | if (ei->addr <= start) | |
97 | start = ei->addr + ei->size; | |
98 | /* | |
99 | * if start is now at or beyond end, we're done, full | |
100 | * coverage | |
101 | */ | |
102 | if (start >= end) | |
103 | return 1; | |
104 | } | |
105 | return 0; | |
106 | } | |
107 | ||
108 | /* | |
109 | * Add a memory region to the kernel e820 map. | |
110 | */ | |
773e673d YL |
111 | static void __init __e820_add_region(struct e820map *e820x, u64 start, u64 size, |
112 | int type) | |
b79cd8f1 | 113 | { |
773e673d | 114 | int x = e820x->nr_map; |
b79cd8f1 | 115 | |
5051fd69 | 116 | if (x >= ARRAY_SIZE(e820x->map)) { |
91eb0f67 BH |
117 | printk(KERN_ERR "e820: too many entries; ignoring [mem %#010llx-%#010llx]\n", |
118 | (unsigned long long) start, | |
119 | (unsigned long long) (start + size - 1)); | |
b79cd8f1 YL |
120 | return; |
121 | } | |
122 | ||
773e673d YL |
123 | e820x->map[x].addr = start; |
124 | e820x->map[x].size = size; | |
125 | e820x->map[x].type = type; | |
126 | e820x->nr_map++; | |
127 | } | |
128 | ||
129 | void __init e820_add_region(u64 start, u64 size, int type) | |
130 | { | |
131 | __e820_add_region(&e820, start, size, type); | |
b79cd8f1 YL |
132 | } |
133 | ||
c61cf4cf YL |
134 | static void __init e820_print_type(u32 type) |
135 | { | |
136 | switch (type) { | |
137 | case E820_RAM: | |
138 | case E820_RESERVED_KERN: | |
91eb0f67 | 139 | printk(KERN_CONT "usable"); |
c61cf4cf YL |
140 | break; |
141 | case E820_RESERVED: | |
91eb0f67 | 142 | printk(KERN_CONT "reserved"); |
c61cf4cf YL |
143 | break; |
144 | case E820_ACPI: | |
91eb0f67 | 145 | printk(KERN_CONT "ACPI data"); |
c61cf4cf YL |
146 | break; |
147 | case E820_NVS: | |
91eb0f67 | 148 | printk(KERN_CONT "ACPI NVS"); |
c61cf4cf YL |
149 | break; |
150 | case E820_UNUSABLE: | |
91eb0f67 | 151 | printk(KERN_CONT "unusable"); |
c61cf4cf | 152 | break; |
ad5fb870 | 153 | case E820_PMEM: |
ec776ef6 CH |
154 | case E820_PRAM: |
155 | printk(KERN_CONT "persistent (type %u)", type); | |
156 | break; | |
c61cf4cf YL |
157 | default: |
158 | printk(KERN_CONT "type %u", type); | |
159 | break; | |
160 | } | |
161 | } | |
162 | ||
b79cd8f1 YL |
163 | void __init e820_print_map(char *who) |
164 | { | |
165 | int i; | |
166 | ||
167 | for (i = 0; i < e820.nr_map; i++) { | |
91eb0f67 | 168 | printk(KERN_INFO "%s: [mem %#018Lx-%#018Lx] ", who, |
b79cd8f1 YL |
169 | (unsigned long long) e820.map[i].addr, |
170 | (unsigned long long) | |
91eb0f67 | 171 | (e820.map[i].addr + e820.map[i].size - 1)); |
c61cf4cf YL |
172 | e820_print_type(e820.map[i].type); |
173 | printk(KERN_CONT "\n"); | |
b79cd8f1 YL |
174 | } |
175 | } | |
176 | ||
177 | /* | |
178 | * Sanitize the BIOS e820 map. | |
179 | * | |
180 | * Some e820 responses include overlapping entries. The following | |
5b7eb2e9 PJ |
181 | * replaces the original e820 map with a new one, removing overlaps, |
182 | * and resolving conflicting memory types in favor of highest | |
183 | * numbered type. | |
b79cd8f1 | 184 | * |
5b7eb2e9 PJ |
185 | * The input parameter biosmap points to an array of 'struct |
186 | * e820entry' which on entry has elements in the range [0, *pnr_map) | |
187 | * valid, and which has space for up to max_nr_map entries. | |
188 | * On return, the resulting sanitized e820 map entries will be in | |
189 | * overwritten in the same location, starting at biosmap. | |
190 | * | |
191 | * The integer pointed to by pnr_map must be valid on entry (the | |
d574ffa1 WC |
192 | * current number of valid entries located at biosmap). If the |
193 | * sanitizing succeeds the *pnr_map will be updated with the new | |
194 | * number of valid entries (something no more than max_nr_map). | |
5b7eb2e9 PJ |
195 | * |
196 | * The return value from sanitize_e820_map() is zero if it | |
197 | * successfully 'sanitized' the map entries passed in, and is -1 | |
198 | * if it did nothing, which can happen if either of (1) it was | |
199 | * only passed one map entry, or (2) any of the input map entries | |
200 | * were invalid (start + size < start, meaning that the size was | |
201 | * so big the described memory range wrapped around through zero.) | |
202 | * | |
203 | * Visually we're performing the following | |
204 | * (1,2,3,4 = memory types)... | |
205 | * | |
206 | * Sample memory map (w/overlaps): | |
207 | * ____22__________________ | |
208 | * ______________________4_ | |
209 | * ____1111________________ | |
210 | * _44_____________________ | |
211 | * 11111111________________ | |
212 | * ____________________33__ | |
213 | * ___________44___________ | |
214 | * __________33333_________ | |
215 | * ______________22________ | |
216 | * ___________________2222_ | |
217 | * _________111111111______ | |
218 | * _____________________11_ | |
219 | * _________________4______ | |
220 | * | |
221 | * Sanitized equivalent (no overlap): | |
222 | * 1_______________________ | |
223 | * _44_____________________ | |
224 | * ___1____________________ | |
225 | * ____22__________________ | |
226 | * ______11________________ | |
227 | * _________1______________ | |
228 | * __________3_____________ | |
229 | * ___________44___________ | |
230 | * _____________33_________ | |
231 | * _______________2________ | |
232 | * ________________1_______ | |
233 | * _________________4______ | |
234 | * ___________________2____ | |
235 | * ____________________33__ | |
236 | * ______________________4_ | |
b79cd8f1 | 237 | */ |
d1bbdd66 MD |
238 | struct change_member { |
239 | struct e820entry *pbios; /* pointer to original bios entry */ | |
240 | unsigned long long addr; /* address for this change point */ | |
241 | }; | |
242 | ||
243 | static int __init cpcompare(const void *a, const void *b) | |
244 | { | |
245 | struct change_member * const *app = a, * const *bpp = b; | |
246 | const struct change_member *ap = *app, *bp = *bpp; | |
247 | ||
248 | /* | |
249 | * Inputs are pointers to two elements of change_point[]. If their | |
250 | * addresses are unequal, their difference dominates. If the addresses | |
251 | * are equal, then consider one that represents the end of its region | |
252 | * to be greater than one that does not. | |
253 | */ | |
254 | if (ap->addr != bp->addr) | |
255 | return ap->addr > bp->addr ? 1 : -1; | |
256 | ||
257 | return (ap->addr != ap->pbios->addr) - (bp->addr != bp->pbios->addr); | |
258 | } | |
5b7eb2e9 | 259 | |
c3965bd1 | 260 | int __init sanitize_e820_map(struct e820entry *biosmap, int max_nr_map, |
ba639039 | 261 | u32 *pnr_map) |
b79cd8f1 | 262 | { |
157fabf0 PJ |
263 | static struct change_member change_point_list[2*E820_X_MAX] __initdata; |
264 | static struct change_member *change_point[2*E820_X_MAX] __initdata; | |
265 | static struct e820entry *overlap_list[E820_X_MAX] __initdata; | |
266 | static struct e820entry new_bios[E820_X_MAX] __initdata; | |
b79cd8f1 YL |
267 | unsigned long current_type, last_type; |
268 | unsigned long long last_addr; | |
d1bbdd66 | 269 | int chgidx; |
b79cd8f1 YL |
270 | int overlap_entries; |
271 | int new_bios_entry; | |
272 | int old_nr, new_nr, chg_nr; | |
273 | int i; | |
274 | ||
b79cd8f1 YL |
275 | /* if there's only one memory region, don't bother */ |
276 | if (*pnr_map < 2) | |
277 | return -1; | |
278 | ||
279 | old_nr = *pnr_map; | |
6e9bcc79 | 280 | BUG_ON(old_nr > max_nr_map); |
b79cd8f1 YL |
281 | |
282 | /* bail out if we find any unreasonable addresses in bios map */ | |
283 | for (i = 0; i < old_nr; i++) | |
284 | if (biosmap[i].addr + biosmap[i].size < biosmap[i].addr) | |
285 | return -1; | |
286 | ||
287 | /* create pointers for initial change-point information (for sorting) */ | |
288 | for (i = 0; i < 2 * old_nr; i++) | |
289 | change_point[i] = &change_point_list[i]; | |
290 | ||
291 | /* record all known change-points (starting and ending addresses), | |
292 | omitting those that are for empty memory regions */ | |
293 | chgidx = 0; | |
294 | for (i = 0; i < old_nr; i++) { | |
295 | if (biosmap[i].size != 0) { | |
296 | change_point[chgidx]->addr = biosmap[i].addr; | |
297 | change_point[chgidx++]->pbios = &biosmap[i]; | |
298 | change_point[chgidx]->addr = biosmap[i].addr + | |
299 | biosmap[i].size; | |
300 | change_point[chgidx++]->pbios = &biosmap[i]; | |
301 | } | |
302 | } | |
303 | chg_nr = chgidx; | |
304 | ||
305 | /* sort change-point list by memory addresses (low -> high) */ | |
706d9a9c | 306 | sort(change_point, chg_nr, sizeof *change_point, cpcompare, NULL); |
b79cd8f1 YL |
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 | */ | |
ec776ef6 | 351 | if (current_type != last_type || current_type == E820_PRAM) { |
b79cd8f1 YL |
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; |
91eb0f67 BH |
438 | printk(KERN_DEBUG "e820: update [mem %#010Lx-%#010Lx] ", |
439 | (unsigned long long) start, (unsigned long long) (end - 1)); | |
c61cf4cf YL |
440 | e820_print_type(old_type); |
441 | printk(KERN_CONT " ==> "); | |
442 | e820_print_type(new_type); | |
443 | printk(KERN_CONT "\n"); | |
444 | ||
5c0e6f03 | 445 | for (i = 0; i < e820x->nr_map; i++) { |
fc9036ea | 446 | struct e820entry *ei = &e820x->map[i]; |
b79cd8f1 | 447 | u64 final_start, final_end; |
78a8b35b YL |
448 | u64 ei_end; |
449 | ||
b79cd8f1 YL |
450 | if (ei->type != old_type) |
451 | continue; | |
78a8b35b YL |
452 | |
453 | ei_end = ei->addr + ei->size; | |
454 | /* totally covered by new range? */ | |
455 | if (ei->addr >= start && ei_end <= end) { | |
b79cd8f1 YL |
456 | ei->type = new_type; |
457 | real_updated_size += ei->size; | |
458 | continue; | |
459 | } | |
78a8b35b YL |
460 | |
461 | /* new range is totally covered? */ | |
462 | if (ei->addr < start && ei_end > end) { | |
463 | __e820_add_region(e820x, start, size, new_type); | |
464 | __e820_add_region(e820x, end, ei_end - end, ei->type); | |
465 | ei->size = start - ei->addr; | |
466 | real_updated_size += size; | |
467 | continue; | |
468 | } | |
469 | ||
b79cd8f1 YL |
470 | /* partially covered */ |
471 | final_start = max(start, ei->addr); | |
78a8b35b | 472 | final_end = min(end, ei_end); |
b79cd8f1 YL |
473 | if (final_start >= final_end) |
474 | continue; | |
5c0e6f03 | 475 | |
773e673d YL |
476 | __e820_add_region(e820x, final_start, final_end - final_start, |
477 | new_type); | |
5c0e6f03 | 478 | |
b79cd8f1 | 479 | real_updated_size += final_end - final_start; |
976dd4dc | 480 | |
773e673d YL |
481 | /* |
482 | * left range could be head or tail, so need to update | |
483 | * size at first. | |
484 | */ | |
485 | ei->size -= final_end - final_start; | |
976dd4dc YL |
486 | if (ei->addr < final_start) |
487 | continue; | |
488 | ei->addr = final_end; | |
b79cd8f1 YL |
489 | } |
490 | return real_updated_size; | |
491 | } | |
492 | ||
fc9036ea YL |
493 | u64 __init e820_update_range(u64 start, u64 size, unsigned old_type, |
494 | unsigned new_type) | |
495 | { | |
773e673d | 496 | return __e820_update_range(&e820, start, size, old_type, new_type); |
fc9036ea YL |
497 | } |
498 | ||
499 | static u64 __init e820_update_range_saved(u64 start, u64 size, | |
500 | unsigned old_type, unsigned new_type) | |
501 | { | |
773e673d | 502 | return __e820_update_range(&e820_saved, start, size, old_type, |
fc9036ea YL |
503 | new_type); |
504 | } | |
505 | ||
7a1fd986 YL |
506 | /* make e820 not cover the range */ |
507 | u64 __init e820_remove_range(u64 start, u64 size, unsigned old_type, | |
508 | int checktype) | |
509 | { | |
510 | int i; | |
1b5576e6 | 511 | u64 end; |
7a1fd986 YL |
512 | u64 real_removed_size = 0; |
513 | ||
232b957a YL |
514 | if (size > (ULLONG_MAX - start)) |
515 | size = ULLONG_MAX - start; | |
516 | ||
1b5576e6 | 517 | end = start + size; |
91eb0f67 BH |
518 | printk(KERN_DEBUG "e820: remove [mem %#010Lx-%#010Lx] ", |
519 | (unsigned long long) start, (unsigned long long) (end - 1)); | |
9f3a5f52 YL |
520 | if (checktype) |
521 | e820_print_type(old_type); | |
1b5576e6 YL |
522 | printk(KERN_CONT "\n"); |
523 | ||
7a1fd986 YL |
524 | for (i = 0; i < e820.nr_map; i++) { |
525 | struct e820entry *ei = &e820.map[i]; | |
526 | u64 final_start, final_end; | |
9f3a5f52 | 527 | u64 ei_end; |
7a1fd986 YL |
528 | |
529 | if (checktype && ei->type != old_type) | |
530 | continue; | |
9f3a5f52 YL |
531 | |
532 | ei_end = ei->addr + ei->size; | |
7a1fd986 | 533 | /* totally covered? */ |
9f3a5f52 | 534 | if (ei->addr >= start && ei_end <= end) { |
7a1fd986 YL |
535 | real_removed_size += ei->size; |
536 | memset(ei, 0, sizeof(struct e820entry)); | |
537 | continue; | |
538 | } | |
9f3a5f52 YL |
539 | |
540 | /* new range is totally covered? */ | |
541 | if (ei->addr < start && ei_end > end) { | |
542 | e820_add_region(end, ei_end - end, ei->type); | |
543 | ei->size = start - ei->addr; | |
544 | real_removed_size += size; | |
545 | continue; | |
546 | } | |
547 | ||
7a1fd986 YL |
548 | /* partially covered */ |
549 | final_start = max(start, ei->addr); | |
9f3a5f52 | 550 | final_end = min(end, ei_end); |
7a1fd986 YL |
551 | if (final_start >= final_end) |
552 | continue; | |
553 | real_removed_size += final_end - final_start; | |
554 | ||
9f3a5f52 YL |
555 | /* |
556 | * left range could be head or tail, so need to update | |
557 | * size at first. | |
558 | */ | |
7a1fd986 YL |
559 | ei->size -= final_end - final_start; |
560 | if (ei->addr < final_start) | |
561 | continue; | |
562 | ei->addr = final_end; | |
563 | } | |
564 | return real_removed_size; | |
565 | } | |
566 | ||
b79cd8f1 YL |
567 | void __init update_e820(void) |
568 | { | |
d574ffa1 | 569 | if (sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map)) |
b79cd8f1 | 570 | return; |
91eb0f67 | 571 | printk(KERN_INFO "e820: modified physical RAM map:\n"); |
b79cd8f1 YL |
572 | e820_print_map("modified"); |
573 | } | |
fc9036ea YL |
574 | static void __init update_e820_saved(void) |
575 | { | |
d574ffa1 WC |
576 | sanitize_e820_map(e820_saved.map, ARRAY_SIZE(e820_saved.map), |
577 | &e820_saved.nr_map); | |
fc9036ea | 578 | } |
fd6493e1 | 579 | #define MAX_GAP_END 0x100000000ull |
b79cd8f1 | 580 | /* |
fd6493e1 | 581 | * Search for a gap in the e820 memory space from start_addr to end_addr. |
b79cd8f1 | 582 | */ |
3381959d | 583 | __init int e820_search_gap(unsigned long *gapstart, unsigned long *gapsize, |
fd6493e1 | 584 | unsigned long start_addr, unsigned long long end_addr) |
b79cd8f1 | 585 | { |
fd6493e1 | 586 | unsigned long long last; |
3381959d | 587 | int i = e820.nr_map; |
b79cd8f1 YL |
588 | int found = 0; |
589 | ||
fd6493e1 AK |
590 | last = (end_addr && end_addr < MAX_GAP_END) ? end_addr : MAX_GAP_END; |
591 | ||
b79cd8f1 YL |
592 | while (--i >= 0) { |
593 | unsigned long long start = e820.map[i].addr; | |
594 | unsigned long long end = start + e820.map[i].size; | |
595 | ||
3381959d AK |
596 | if (end < start_addr) |
597 | continue; | |
598 | ||
b79cd8f1 YL |
599 | /* |
600 | * Since "last" is at most 4GB, we know we'll | |
601 | * fit in 32 bits if this condition is true | |
602 | */ | |
603 | if (last > end) { | |
604 | unsigned long gap = last - end; | |
605 | ||
3381959d AK |
606 | if (gap >= *gapsize) { |
607 | *gapsize = gap; | |
608 | *gapstart = end; | |
b79cd8f1 YL |
609 | found = 1; |
610 | } | |
611 | } | |
612 | if (start < last) | |
613 | last = start; | |
614 | } | |
3381959d AK |
615 | return found; |
616 | } | |
617 | ||
618 | /* | |
619 | * Search for the biggest gap in the low 32 bits of the e820 | |
620 | * memory space. We pass this space to PCI to assign MMIO resources | |
621 | * for hotplug or unconfigured devices in. | |
622 | * Hopefully the BIOS let enough space left. | |
623 | */ | |
624 | __init void e820_setup_gap(void) | |
625 | { | |
5d423ccd | 626 | unsigned long gapstart, gapsize; |
3381959d AK |
627 | int found; |
628 | ||
629 | gapstart = 0x10000000; | |
630 | gapsize = 0x400000; | |
fd6493e1 | 631 | found = e820_search_gap(&gapstart, &gapsize, 0, MAX_GAP_END); |
b79cd8f1 YL |
632 | |
633 | #ifdef CONFIG_X86_64 | |
634 | if (!found) { | |
c987d12f | 635 | gapstart = (max_pfn << PAGE_SHIFT) + 1024*1024; |
ad361c98 | 636 | printk(KERN_ERR |
91eb0f67 BH |
637 | "e820: cannot find a gap in the 32bit address range\n" |
638 | "e820: PCI devices with unassigned 32bit BARs may break!\n"); | |
b79cd8f1 YL |
639 | } |
640 | #endif | |
641 | ||
642 | /* | |
5d423ccd | 643 | * e820_reserve_resources_late protect stolen RAM already |
b79cd8f1 | 644 | */ |
5d423ccd | 645 | pci_mem_start = gapstart; |
b79cd8f1 YL |
646 | |
647 | printk(KERN_INFO | |
91eb0f67 BH |
648 | "e820: [mem %#010lx-%#010lx] available for PCI devices\n", |
649 | gapstart, gapstart + gapsize - 1); | |
b79cd8f1 YL |
650 | } |
651 | ||
8c5beb50 HY |
652 | /** |
653 | * Because of the size limitation of struct boot_params, only first | |
654 | * 128 E820 memory entries are passed to kernel via | |
655 | * boot_params.e820_map, others are passed via SETUP_E820_EXT node of | |
656 | * linked list of struct setup_data, which is parsed here. | |
657 | */ | |
30e46b57 | 658 | void __init parse_e820_ext(u64 phys_addr, u32 data_len) |
8c5beb50 | 659 | { |
8c5beb50 HY |
660 | int entries; |
661 | struct e820entry *extmap; | |
30e46b57 | 662 | struct setup_data *sdata; |
8c5beb50 | 663 | |
30e46b57 | 664 | sdata = early_memremap(phys_addr, data_len); |
8c5beb50 | 665 | entries = sdata->len / sizeof(struct e820entry); |
8c5beb50 | 666 | extmap = (struct e820entry *)(sdata->data); |
dc8e8120 | 667 | __append_e820_map(extmap, entries); |
8c5beb50 | 668 | sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map); |
8d4a40bc | 669 | early_memunmap(sdata, data_len); |
91eb0f67 | 670 | printk(KERN_INFO "e820: extended physical RAM map:\n"); |
8c5beb50 HY |
671 | e820_print_map("extended"); |
672 | } | |
673 | ||
bf62f398 YL |
674 | #if defined(CONFIG_X86_64) || \ |
675 | (defined(CONFIG_X86_32) && defined(CONFIG_HIBERNATION)) | |
676 | /** | |
677 | * Find the ranges of physical addresses that do not correspond to | |
678 | * e820 RAM areas and mark the corresponding pages as nosave for | |
679 | * hibernation (32 bit) or software suspend and suspend to RAM (64 bit). | |
680 | * | |
681 | * This function requires the e820 map to be sorted and without any | |
84779575 | 682 | * overlapping entries. |
bf62f398 YL |
683 | */ |
684 | void __init e820_mark_nosave_regions(unsigned long limit_pfn) | |
685 | { | |
686 | int i; | |
84779575 | 687 | unsigned long pfn = 0; |
bf62f398 | 688 | |
84779575 | 689 | for (i = 0; i < e820.nr_map; i++) { |
bf62f398 YL |
690 | struct e820entry *ei = &e820.map[i]; |
691 | ||
692 | if (pfn < PFN_UP(ei->addr)) | |
693 | register_nosave_region(pfn, PFN_UP(ei->addr)); | |
694 | ||
695 | pfn = PFN_DOWN(ei->addr + ei->size); | |
ec776ef6 | 696 | |
28bb2237 | 697 | if (ei->type != E820_RAM && ei->type != E820_RESERVED_KERN) |
bf62f398 YL |
698 | register_nosave_region(PFN_UP(ei->addr), pfn); |
699 | ||
700 | if (pfn >= limit_pfn) | |
701 | break; | |
702 | } | |
703 | } | |
704 | #endif | |
a4c81cf6 | 705 | |
b54ac6d2 | 706 | #ifdef CONFIG_ACPI |
b69edc76 RW |
707 | /** |
708 | * Mark ACPI NVS memory region, so that we can save/restore it during | |
709 | * hibernation and the subsequent resume. | |
710 | */ | |
711 | static int __init e820_mark_nvs_memory(void) | |
712 | { | |
713 | int i; | |
714 | ||
715 | for (i = 0; i < e820.nr_map; i++) { | |
716 | struct e820entry *ei = &e820.map[i]; | |
717 | ||
718 | if (ei->type == E820_NVS) | |
b54ac6d2 | 719 | acpi_nvs_register(ei->addr, ei->size); |
b69edc76 RW |
720 | } |
721 | ||
722 | return 0; | |
723 | } | |
724 | core_initcall(e820_mark_nvs_memory); | |
725 | #endif | |
726 | ||
2944e16b | 727 | /* |
72d7c3b3 | 728 | * pre allocated 4k and reserved it in memblock and e820_saved |
2944e16b | 729 | */ |
ab5d140b | 730 | u64 __init early_reserve_e820(u64 size, u64 align) |
2944e16b | 731 | { |
2944e16b | 732 | u64 addr; |
2944e16b | 733 | |
ab5d140b TH |
734 | addr = __memblock_alloc_base(size, align, MEMBLOCK_ALLOC_ACCESSIBLE); |
735 | if (addr) { | |
736 | e820_update_range_saved(addr, size, E820_RAM, E820_RESERVED); | |
91eb0f67 | 737 | printk(KERN_INFO "e820: update e820_saved for early_reserve_e820\n"); |
ab5d140b | 738 | update_e820_saved(); |
61438766 | 739 | } |
2944e16b | 740 | |
2944e16b YL |
741 | return addr; |
742 | } | |
743 | ||
ee0c80fa YL |
744 | #ifdef CONFIG_X86_32 |
745 | # ifdef CONFIG_X86_PAE | |
746 | # define MAX_ARCH_PFN (1ULL<<(36-PAGE_SHIFT)) | |
747 | # else | |
748 | # define MAX_ARCH_PFN (1ULL<<(32-PAGE_SHIFT)) | |
749 | # endif | |
750 | #else /* CONFIG_X86_32 */ | |
bd70e522 | 751 | # define MAX_ARCH_PFN MAXMEM>>PAGE_SHIFT |
ee0c80fa YL |
752 | #endif |
753 | ||
ee0c80fa YL |
754 | /* |
755 | * Find the highest page frame number we have available | |
756 | */ | |
ec776ef6 | 757 | static unsigned long __init e820_end_pfn(unsigned long limit_pfn) |
ee0c80fa | 758 | { |
2dc807b3 YL |
759 | int i; |
760 | unsigned long last_pfn = 0; | |
ee0c80fa YL |
761 | unsigned long max_arch_pfn = MAX_ARCH_PFN; |
762 | ||
2dc807b3 YL |
763 | for (i = 0; i < e820.nr_map; i++) { |
764 | struct e820entry *ei = &e820.map[i]; | |
f361a450 | 765 | unsigned long start_pfn; |
2dc807b3 YL |
766 | unsigned long end_pfn; |
767 | ||
ec776ef6 CH |
768 | /* |
769 | * Persistent memory is accounted as ram for purposes of | |
770 | * establishing max_pfn and mem_map. | |
771 | */ | |
772 | if (ei->type != E820_RAM && ei->type != E820_PRAM) | |
c22d4c18 | 773 | continue; |
c22d4c18 | 774 | |
f361a450 | 775 | start_pfn = ei->addr >> PAGE_SHIFT; |
2dc807b3 | 776 | end_pfn = (ei->addr + ei->size) >> PAGE_SHIFT; |
f361a450 YL |
777 | |
778 | if (start_pfn >= limit_pfn) | |
779 | continue; | |
780 | if (end_pfn > limit_pfn) { | |
781 | last_pfn = limit_pfn; | |
782 | break; | |
783 | } | |
2dc807b3 YL |
784 | if (end_pfn > last_pfn) |
785 | last_pfn = end_pfn; | |
786 | } | |
ee0c80fa YL |
787 | |
788 | if (last_pfn > max_arch_pfn) | |
789 | last_pfn = max_arch_pfn; | |
ee0c80fa | 790 | |
91eb0f67 | 791 | printk(KERN_INFO "e820: last_pfn = %#lx max_arch_pfn = %#lx\n", |
ee0c80fa YL |
792 | last_pfn, max_arch_pfn); |
793 | return last_pfn; | |
794 | } | |
f361a450 YL |
795 | unsigned long __init e820_end_of_ram_pfn(void) |
796 | { | |
ec776ef6 | 797 | return e820_end_pfn(MAX_ARCH_PFN); |
f361a450 | 798 | } |
ee0c80fa | 799 | |
f361a450 YL |
800 | unsigned long __init e820_end_of_low_ram_pfn(void) |
801 | { | |
ec776ef6 | 802 | return e820_end_pfn(1UL << (32-PAGE_SHIFT)); |
f361a450 | 803 | } |
ee0c80fa | 804 | |
ab4a465e YL |
805 | static void early_panic(char *msg) |
806 | { | |
807 | early_printk(msg); | |
808 | panic(msg); | |
809 | } | |
810 | ||
69a7704d YL |
811 | static int userdef __initdata; |
812 | ||
ab4a465e YL |
813 | /* "mem=nopentium" disables the 4MB page tables. */ |
814 | static int __init parse_memopt(char *p) | |
815 | { | |
816 | u64 mem_size; | |
817 | ||
818 | if (!p) | |
819 | return -EINVAL; | |
820 | ||
ab4a465e | 821 | if (!strcmp(p, "nopentium")) { |
9a6d44b9 | 822 | #ifdef CONFIG_X86_32 |
ab4a465e YL |
823 | setup_clear_cpu_cap(X86_FEATURE_PSE); |
824 | return 0; | |
9a6d44b9 KM |
825 | #else |
826 | printk(KERN_WARNING "mem=nopentium ignored! (only supported on x86_32)\n"); | |
827 | return -EINVAL; | |
ab4a465e | 828 | #endif |
9a6d44b9 | 829 | } |
ab4a465e | 830 | |
69a7704d | 831 | userdef = 1; |
ab4a465e | 832 | mem_size = memparse(p, &p); |
77eed821 KM |
833 | /* don't remove all of memory when handling "mem={invalid}" param */ |
834 | if (mem_size == 0) | |
835 | return -EINVAL; | |
69a7704d | 836 | e820_remove_range(mem_size, ULLONG_MAX - mem_size, E820_RAM, 1); |
611dfd78 | 837 | |
ab4a465e YL |
838 | return 0; |
839 | } | |
840 | early_param("mem", parse_memopt); | |
841 | ||
9710f581 | 842 | static int __init parse_memmap_one(char *p) |
ab4a465e YL |
843 | { |
844 | char *oldp; | |
845 | u64 start_at, mem_size; | |
846 | ||
a737abd1 CG |
847 | if (!p) |
848 | return -EINVAL; | |
849 | ||
d6be118a | 850 | if (!strncmp(p, "exactmap", 8)) { |
ab4a465e YL |
851 | #ifdef CONFIG_CRASH_DUMP |
852 | /* | |
853 | * If we are doing a crash dump, we still need to know | |
854 | * the real mem size before original memory map is | |
855 | * reset. | |
856 | */ | |
f361a450 | 857 | saved_max_pfn = e820_end_of_ram_pfn(); |
ab4a465e YL |
858 | #endif |
859 | e820.nr_map = 0; | |
860 | userdef = 1; | |
861 | return 0; | |
862 | } | |
863 | ||
864 | oldp = p; | |
865 | mem_size = memparse(p, &p); | |
866 | if (p == oldp) | |
867 | return -EINVAL; | |
868 | ||
869 | userdef = 1; | |
870 | if (*p == '@') { | |
871 | start_at = memparse(p+1, &p); | |
d0be6bde | 872 | e820_add_region(start_at, mem_size, E820_RAM); |
ab4a465e YL |
873 | } else if (*p == '#') { |
874 | start_at = memparse(p+1, &p); | |
d0be6bde | 875 | e820_add_region(start_at, mem_size, E820_ACPI); |
ab4a465e YL |
876 | } else if (*p == '$') { |
877 | start_at = memparse(p+1, &p); | |
d0be6bde | 878 | e820_add_region(start_at, mem_size, E820_RESERVED); |
ec776ef6 CH |
879 | } else if (*p == '!') { |
880 | start_at = memparse(p+1, &p); | |
881 | e820_add_region(start_at, mem_size, E820_PRAM); | |
7b479bec | 882 | } else |
69a7704d | 883 | e820_remove_range(mem_size, ULLONG_MAX - mem_size, E820_RAM, 1); |
7b479bec | 884 | |
ab4a465e YL |
885 | return *p == '\0' ? 0 : -EINVAL; |
886 | } | |
9710f581 YL |
887 | static int __init parse_memmap_opt(char *str) |
888 | { | |
889 | while (str) { | |
890 | char *k = strchr(str, ','); | |
891 | ||
892 | if (k) | |
893 | *k++ = 0; | |
894 | ||
895 | parse_memmap_one(str); | |
896 | str = k; | |
897 | } | |
898 | ||
899 | return 0; | |
900 | } | |
ab4a465e YL |
901 | early_param("memmap", parse_memmap_opt); |
902 | ||
903 | void __init finish_e820_parsing(void) | |
904 | { | |
905 | if (userdef) { | |
d574ffa1 WC |
906 | if (sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), |
907 | &e820.nr_map) < 0) | |
ab4a465e | 908 | early_panic("Invalid user supplied memory map"); |
ab4a465e | 909 | |
91eb0f67 | 910 | printk(KERN_INFO "e820: user-defined physical RAM map:\n"); |
ab4a465e YL |
911 | e820_print_map("user"); |
912 | } | |
913 | } | |
41c094fd | 914 | |
e6e5f840 | 915 | static const char *e820_type_to_string(int e820_type) |
5dfcf14d BW |
916 | { |
917 | switch (e820_type) { | |
918 | case E820_RESERVED_KERN: | |
919 | case E820_RAM: return "System RAM"; | |
920 | case E820_ACPI: return "ACPI Tables"; | |
921 | case E820_NVS: return "ACPI Non-volatile Storage"; | |
671eef85 | 922 | case E820_UNUSABLE: return "Unusable memory"; |
ad5fb870 DW |
923 | case E820_PRAM: return "Persistent Memory (legacy)"; |
924 | case E820_PMEM: return "Persistent Memory"; | |
5dfcf14d BW |
925 | default: return "reserved"; |
926 | } | |
927 | } | |
928 | ||
f33b14a4 TK |
929 | static unsigned long e820_type_to_iomem_type(int e820_type) |
930 | { | |
931 | switch (e820_type) { | |
932 | case E820_RESERVED_KERN: | |
933 | case E820_RAM: | |
934 | return IORESOURCE_SYSTEM_RAM; | |
935 | case E820_ACPI: | |
936 | case E820_NVS: | |
937 | case E820_UNUSABLE: | |
938 | case E820_PRAM: | |
939 | case E820_PMEM: | |
940 | default: | |
941 | return IORESOURCE_MEM; | |
942 | } | |
943 | } | |
944 | ||
945 | static unsigned long e820_type_to_iores_desc(int e820_type) | |
946 | { | |
947 | switch (e820_type) { | |
948 | case E820_ACPI: | |
949 | return IORES_DESC_ACPI_TABLES; | |
950 | case E820_NVS: | |
951 | return IORES_DESC_ACPI_NV_STORAGE; | |
952 | case E820_PMEM: | |
953 | return IORES_DESC_PERSISTENT_MEMORY; | |
954 | case E820_PRAM: | |
955 | return IORES_DESC_PERSISTENT_MEMORY_LEGACY; | |
956 | case E820_RESERVED_KERN: | |
957 | case E820_RAM: | |
958 | case E820_UNUSABLE: | |
959 | default: | |
960 | return IORES_DESC_NONE; | |
961 | } | |
962 | } | |
963 | ||
ad5fb870 DW |
964 | static bool do_mark_busy(u32 type, struct resource *res) |
965 | { | |
966 | /* this is the legacy bios/dos rom-shadow + mmio region */ | |
967 | if (res->start < (1ULL<<20)) | |
968 | return true; | |
969 | ||
970 | /* | |
971 | * Treat persistent memory like device memory, i.e. reserve it | |
972 | * for exclusive use of a driver | |
973 | */ | |
974 | switch (type) { | |
975 | case E820_RESERVED: | |
976 | case E820_PRAM: | |
977 | case E820_PMEM: | |
978 | return false; | |
979 | default: | |
980 | return true; | |
981 | } | |
982 | } | |
983 | ||
41c094fd YL |
984 | /* |
985 | * Mark e820 reserved areas as busy for the resource manager. | |
986 | */ | |
a5444d15 | 987 | static struct resource __initdata *e820_res; |
41c094fd YL |
988 | void __init e820_reserve_resources(void) |
989 | { | |
990 | int i; | |
58f7c988 | 991 | struct resource *res; |
a5444d15 | 992 | u64 end; |
41c094fd | 993 | |
3c1596ef | 994 | res = alloc_bootmem(sizeof(struct resource) * e820.nr_map); |
58f7c988 | 995 | e820_res = res; |
41c094fd | 996 | for (i = 0; i < e820.nr_map; i++) { |
b4df32f4 | 997 | end = e820.map[i].addr + e820.map[i].size - 1; |
8308c54d | 998 | if (end != (resource_size_t)end) { |
41c094fd YL |
999 | res++; |
1000 | continue; | |
1001 | } | |
5dfcf14d | 1002 | res->name = e820_type_to_string(e820.map[i].type); |
b4df32f4 YL |
1003 | res->start = e820.map[i].addr; |
1004 | res->end = end; | |
1005 | ||
f33b14a4 TK |
1006 | res->flags = e820_type_to_iomem_type(e820.map[i].type); |
1007 | res->desc = e820_type_to_iores_desc(e820.map[i].type); | |
a5444d15 IM |
1008 | |
1009 | /* | |
1010 | * don't register the region that could be conflicted with | |
1011 | * pci device BAR resource and insert them later in | |
1012 | * pcibios_resource_survey() | |
1013 | */ | |
ad5fb870 | 1014 | if (do_mark_busy(e820.map[i].type, res)) { |
1f987577 | 1015 | res->flags |= IORESOURCE_BUSY; |
58f7c988 | 1016 | insert_resource(&iomem_resource, res); |
1f987577 | 1017 | } |
41c094fd YL |
1018 | res++; |
1019 | } | |
5dfcf14d BW |
1020 | |
1021 | for (i = 0; i < e820_saved.nr_map; i++) { | |
1022 | struct e820entry *entry = &e820_saved.map[i]; | |
1023 | firmware_map_add_early(entry->addr, | |
4ed940d4 | 1024 | entry->addr + entry->size, |
5dfcf14d BW |
1025 | e820_type_to_string(entry->type)); |
1026 | } | |
41c094fd YL |
1027 | } |
1028 | ||
45fbe3ee LT |
1029 | /* How much should we pad RAM ending depending on where it is? */ |
1030 | static unsigned long ram_alignment(resource_size_t pos) | |
1031 | { | |
1032 | unsigned long mb = pos >> 20; | |
1033 | ||
1034 | /* To 64kB in the first megabyte */ | |
1035 | if (!mb) | |
1036 | return 64*1024; | |
1037 | ||
1038 | /* To 1MB in the first 16MB */ | |
1039 | if (mb < 16) | |
1040 | return 1024*1024; | |
1041 | ||
15b812f1 YL |
1042 | /* To 64MB for anything above that */ |
1043 | return 64*1024*1024; | |
45fbe3ee LT |
1044 | } |
1045 | ||
7c5371c4 YL |
1046 | #define MAX_RESOURCE_SIZE ((resource_size_t)-1) |
1047 | ||
58f7c988 YL |
1048 | void __init e820_reserve_resources_late(void) |
1049 | { | |
1050 | int i; | |
1051 | struct resource *res; | |
1052 | ||
1053 | res = e820_res; | |
1054 | for (i = 0; i < e820.nr_map; i++) { | |
a5444d15 | 1055 | if (!res->parent && res->end) |
1f987577 | 1056 | insert_resource_expand_to_fit(&iomem_resource, res); |
58f7c988 YL |
1057 | res++; |
1058 | } | |
45fbe3ee LT |
1059 | |
1060 | /* | |
1061 | * Try to bump up RAM regions to reasonable boundaries to | |
1062 | * avoid stolen RAM: | |
1063 | */ | |
1064 | for (i = 0; i < e820.nr_map; i++) { | |
7c5371c4 YL |
1065 | struct e820entry *entry = &e820.map[i]; |
1066 | u64 start, end; | |
45fbe3ee LT |
1067 | |
1068 | if (entry->type != E820_RAM) | |
1069 | continue; | |
1070 | start = entry->addr + entry->size; | |
7c5371c4 YL |
1071 | end = round_up(start, ram_alignment(start)) - 1; |
1072 | if (end > MAX_RESOURCE_SIZE) | |
1073 | end = MAX_RESOURCE_SIZE; | |
1074 | if (start >= end) | |
45fbe3ee | 1075 | continue; |
91eb0f67 BH |
1076 | printk(KERN_DEBUG |
1077 | "e820: reserve RAM buffer [mem %#010llx-%#010llx]\n", | |
1078 | start, end); | |
7c5371c4 YL |
1079 | reserve_region_with_split(&iomem_resource, start, end, |
1080 | "RAM buffer"); | |
45fbe3ee | 1081 | } |
58f7c988 YL |
1082 | } |
1083 | ||
95a71a45 | 1084 | char *__init default_machine_specific_memory_setup(void) |
064d25f1 YL |
1085 | { |
1086 | char *who = "BIOS-e820"; | |
ba639039 | 1087 | u32 new_nr; |
064d25f1 YL |
1088 | /* |
1089 | * Try to copy the BIOS-supplied E820-map. | |
1090 | * | |
1091 | * Otherwise fake a memory map; one section from 0k->640k, | |
1092 | * the next section from 1mb->appropriate_mem_k | |
1093 | */ | |
1094 | new_nr = boot_params.e820_entries; | |
1095 | sanitize_e820_map(boot_params.e820_map, | |
1096 | ARRAY_SIZE(boot_params.e820_map), | |
1097 | &new_nr); | |
1098 | boot_params.e820_entries = new_nr; | |
dc8e8120 YL |
1099 | if (append_e820_map(boot_params.e820_map, boot_params.e820_entries) |
1100 | < 0) { | |
95a71a45 | 1101 | u64 mem_size; |
064d25f1 YL |
1102 | |
1103 | /* compare results from other methods and take the greater */ | |
1104 | if (boot_params.alt_mem_k | |
1105 | < boot_params.screen_info.ext_mem_k) { | |
1106 | mem_size = boot_params.screen_info.ext_mem_k; | |
1107 | who = "BIOS-88"; | |
1108 | } else { | |
1109 | mem_size = boot_params.alt_mem_k; | |
1110 | who = "BIOS-e801"; | |
1111 | } | |
1112 | ||
1113 | e820.nr_map = 0; | |
1114 | e820_add_region(0, LOWMEMSIZE(), E820_RAM); | |
1115 | e820_add_region(HIGH_MEMORY, mem_size << 10, E820_RAM); | |
064d25f1 YL |
1116 | } |
1117 | ||
1118 | /* In case someone cares... */ | |
1119 | return who; | |
1120 | } | |
1121 | ||
064d25f1 YL |
1122 | void __init setup_memory_map(void) |
1123 | { | |
0be15526 YL |
1124 | char *who; |
1125 | ||
6b18ae3e | 1126 | who = x86_init.resources.memory_setup(); |
0be15526 | 1127 | memcpy(&e820_saved, &e820, sizeof(struct e820map)); |
91eb0f67 | 1128 | printk(KERN_INFO "e820: BIOS-provided physical RAM map:\n"); |
0be15526 | 1129 | e820_print_map(who); |
064d25f1 | 1130 | } |
72d7c3b3 YL |
1131 | |
1132 | void __init memblock_x86_fill(void) | |
1133 | { | |
1134 | int i; | |
1135 | u64 end; | |
1136 | ||
1137 | /* | |
1138 | * EFI may have more than 128 entries | |
1139 | * We are safe to enable resizing, beause memblock_x86_fill() | |
1140 | * is rather later for x86 | |
1141 | */ | |
1aadc056 | 1142 | memblock_allow_resize(); |
72d7c3b3 YL |
1143 | |
1144 | for (i = 0; i < e820.nr_map; i++) { | |
1145 | struct e820entry *ei = &e820.map[i]; | |
1146 | ||
1147 | end = ei->addr + ei->size; | |
1148 | if (end != (resource_size_t)end) | |
1149 | continue; | |
1150 | ||
1151 | if (ei->type != E820_RAM && ei->type != E820_RESERVED_KERN) | |
1152 | continue; | |
1153 | ||
1154 | memblock_add(ei->addr, ei->size); | |
1155 | } | |
1156 | ||
6ede1fd3 YL |
1157 | /* throw away partial pages */ |
1158 | memblock_trim_memory(PAGE_SIZE); | |
1159 | ||
72d7c3b3 YL |
1160 | memblock_dump_all(); |
1161 | } | |
6f2a7536 YL |
1162 | |
1163 | void __init memblock_find_dma_reserve(void) | |
1164 | { | |
1165 | #ifdef CONFIG_X86_64 | |
6b5d41a1 TH |
1166 | u64 nr_pages = 0, nr_free_pages = 0; |
1167 | unsigned long start_pfn, end_pfn; | |
1168 | phys_addr_t start, end; | |
1169 | int i; | |
1170 | u64 u; | |
1171 | ||
6f2a7536 YL |
1172 | /* |
1173 | * need to find out used area below MAX_DMA_PFN | |
1174 | * need to use memblock to get free size in [0, MAX_DMA_PFN] | |
1175 | * at first, and assume boot_mem will not take below MAX_DMA_PFN | |
1176 | */ | |
6b5d41a1 | 1177 | for_each_mem_pfn_range(i, MAX_NUMNODES, &start_pfn, &end_pfn, NULL) { |
29258cf4 XQ |
1178 | start_pfn = min(start_pfn, MAX_DMA_PFN); |
1179 | end_pfn = min(end_pfn, MAX_DMA_PFN); | |
6b5d41a1 TH |
1180 | nr_pages += end_pfn - start_pfn; |
1181 | } | |
1182 | ||
fc6daaf9 TL |
1183 | for_each_free_mem_range(u, NUMA_NO_NODE, MEMBLOCK_NONE, &start, &end, |
1184 | NULL) { | |
6b5d41a1 TH |
1185 | start_pfn = min_t(unsigned long, PFN_UP(start), MAX_DMA_PFN); |
1186 | end_pfn = min_t(unsigned long, PFN_DOWN(end), MAX_DMA_PFN); | |
1187 | if (start_pfn < end_pfn) | |
1188 | nr_free_pages += end_pfn - start_pfn; | |
1189 | } | |
1190 | ||
1191 | set_dma_reserve(nr_pages - nr_free_pages); | |
6f2a7536 YL |
1192 | #endif |
1193 | } |