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11#include <linux/init.h>
12#include <linux/pfn.h>
13#include <linux/bootmem.h>
14#include <linux/module.h>
15
16#include <asm/bug.h>
17#include <asm/io.h>
18#include <asm/processor.h>
19
20#include "internal.h"
21
22
23
24
25
26unsigned long max_low_pfn;
27unsigned long min_low_pfn;
28unsigned long max_pfn;
29
30static LIST_HEAD(bdata_list);
31#ifdef CONFIG_CRASH_DUMP
32
33
34
35
36unsigned long saved_max_pfn;
37#endif
38
39
40unsigned long __init bootmem_bootmap_pages(unsigned long pages)
41{
42 unsigned long mapsize;
43
44 mapsize = (pages+7)/8;
45 mapsize = (mapsize + ~PAGE_MASK) & PAGE_MASK;
46 mapsize >>= PAGE_SHIFT;
47
48 return mapsize;
49}
50
51
52
53
54static void __init link_bootmem(bootmem_data_t *bdata)
55{
56 bootmem_data_t *ent;
57
58 if (list_empty(&bdata_list)) {
59 list_add(&bdata->list, &bdata_list);
60 return;
61 }
62
63 list_for_each_entry(ent, &bdata_list, list) {
64 if (bdata->node_boot_start < ent->node_boot_start) {
65 list_add_tail(&bdata->list, &ent->list);
66 return;
67 }
68 }
69 list_add_tail(&bdata->list, &bdata_list);
70}
71
72
73
74
75static unsigned long __init get_mapsize(bootmem_data_t *bdata)
76{
77 unsigned long mapsize;
78 unsigned long start = PFN_DOWN(bdata->node_boot_start);
79 unsigned long end = bdata->node_low_pfn;
80
81 mapsize = ((end - start) + 7) / 8;
82 return ALIGN(mapsize, sizeof(long));
83}
84
85
86
87
88static unsigned long __init init_bootmem_core(pg_data_t *pgdat,
89 unsigned long mapstart, unsigned long start, unsigned long end)
90{
91 bootmem_data_t *bdata = pgdat->bdata;
92 unsigned long mapsize;
93
94 bdata->node_bootmem_map = phys_to_virt(PFN_PHYS(mapstart));
95 bdata->node_boot_start = PFN_PHYS(start);
96 bdata->node_low_pfn = end;
97 link_bootmem(bdata);
98
99
100
101
102
103 mapsize = get_mapsize(bdata);
104 memset(bdata->node_bootmem_map, 0xff, mapsize);
105
106 return mapsize;
107}
108
109
110
111
112
113
114static void __init reserve_bootmem_core(bootmem_data_t *bdata, unsigned long addr,
115 unsigned long size)
116{
117 unsigned long sidx, eidx;
118 unsigned long i;
119
120
121
122
123
124 BUG_ON(!size);
125 BUG_ON(PFN_DOWN(addr) >= bdata->node_low_pfn);
126 BUG_ON(PFN_UP(addr + size) > bdata->node_low_pfn);
127
128 sidx = PFN_DOWN(addr - bdata->node_boot_start);
129 eidx = PFN_UP(addr + size - bdata->node_boot_start);
130
131 for (i = sidx; i < eidx; i++)
132 if (test_and_set_bit(i, bdata->node_bootmem_map)) {
133#ifdef CONFIG_DEBUG_BOOTMEM
134 printk("hm, page %08lx reserved twice.\n", i*PAGE_SIZE);
135#endif
136 }
137}
138
139static void __init free_bootmem_core(bootmem_data_t *bdata, unsigned long addr,
140 unsigned long size)
141{
142 unsigned long sidx, eidx;
143 unsigned long i;
144
145
146
147
148
149 BUG_ON(!size);
150 BUG_ON(PFN_DOWN(addr + size) > bdata->node_low_pfn);
151
152 if (addr < bdata->last_success)
153 bdata->last_success = addr;
154
155
156
157
158 sidx = PFN_UP(addr) - PFN_DOWN(bdata->node_boot_start);
159 eidx = PFN_DOWN(addr + size - bdata->node_boot_start);
160
161 for (i = sidx; i < eidx; i++) {
162 if (unlikely(!test_and_clear_bit(i, bdata->node_bootmem_map)))
163 BUG();
164 }
165}
166
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178
179
180void * __init
181__alloc_bootmem_core(struct bootmem_data *bdata, unsigned long size,
182 unsigned long align, unsigned long goal, unsigned long limit)
183{
184 unsigned long offset, remaining_size, areasize, preferred;
185 unsigned long i, start = 0, incr, eidx, end_pfn;
186 void *ret;
187
188 if (!size) {
189 printk("__alloc_bootmem_core(): zero-sized request\n");
190 BUG();
191 }
192 BUG_ON(align & (align-1));
193
194 if (limit && bdata->node_boot_start >= limit)
195 return NULL;
196
197
198 if (!bdata->node_bootmem_map)
199 return NULL;
200
201 end_pfn = bdata->node_low_pfn;
202 limit = PFN_DOWN(limit);
203 if (limit && end_pfn > limit)
204 end_pfn = limit;
205
206 eidx = end_pfn - PFN_DOWN(bdata->node_boot_start);
207 offset = 0;
208 if (align && (bdata->node_boot_start & (align - 1UL)) != 0)
209 offset = align - (bdata->node_boot_start & (align - 1UL));
210 offset = PFN_DOWN(offset);
211
212
213
214
215
216 if (goal && goal >= bdata->node_boot_start && PFN_DOWN(goal) < end_pfn) {
217 preferred = goal - bdata->node_boot_start;
218
219 if (bdata->last_success >= preferred)
220 if (!limit || (limit && limit > bdata->last_success))
221 preferred = bdata->last_success;
222 } else
223 preferred = 0;
224
225 preferred = PFN_DOWN(ALIGN(preferred, align)) + offset;
226 areasize = (size + PAGE_SIZE-1) / PAGE_SIZE;
227 incr = align >> PAGE_SHIFT ? : 1;
228
229restart_scan:
230 for (i = preferred; i < eidx; i += incr) {
231 unsigned long j;
232 i = find_next_zero_bit(bdata->node_bootmem_map, eidx, i);
233 i = ALIGN(i, incr);
234 if (i >= eidx)
235 break;
236 if (test_bit(i, bdata->node_bootmem_map))
237 continue;
238 for (j = i + 1; j < i + areasize; ++j) {
239 if (j >= eidx)
240 goto fail_block;
241 if (test_bit(j, bdata->node_bootmem_map))
242 goto fail_block;
243 }
244 start = i;
245 goto found;
246 fail_block:
247 i = ALIGN(j, incr);
248 }
249
250 if (preferred > offset) {
251 preferred = offset;
252 goto restart_scan;
253 }
254 return NULL;
255
256found:
257 bdata->last_success = PFN_PHYS(start);
258 BUG_ON(start >= eidx);
259
260
261
262
263
264
265 if (align < PAGE_SIZE &&
266 bdata->last_offset && bdata->last_pos+1 == start) {
267 offset = ALIGN(bdata->last_offset, align);
268 BUG_ON(offset > PAGE_SIZE);
269 remaining_size = PAGE_SIZE - offset;
270 if (size < remaining_size) {
271 areasize = 0;
272
273 bdata->last_offset = offset + size;
274 ret = phys_to_virt(bdata->last_pos * PAGE_SIZE +
275 offset +
276 bdata->node_boot_start);
277 } else {
278 remaining_size = size - remaining_size;
279 areasize = (remaining_size + PAGE_SIZE-1) / PAGE_SIZE;
280 ret = phys_to_virt(bdata->last_pos * PAGE_SIZE +
281 offset +
282 bdata->node_boot_start);
283 bdata->last_pos = start + areasize - 1;
284 bdata->last_offset = remaining_size;
285 }
286 bdata->last_offset &= ~PAGE_MASK;
287 } else {
288 bdata->last_pos = start + areasize - 1;
289 bdata->last_offset = size & ~PAGE_MASK;
290 ret = phys_to_virt(start * PAGE_SIZE + bdata->node_boot_start);
291 }
292
293
294
295
296 for (i = start; i < start + areasize; i++)
297 if (unlikely(test_and_set_bit(i, bdata->node_bootmem_map)))
298 BUG();
299 memset(ret, 0, size);
300 return ret;
301}
302
303static unsigned long __init free_all_bootmem_core(pg_data_t *pgdat)
304{
305 struct page *page;
306 unsigned long pfn;
307 bootmem_data_t *bdata = pgdat->bdata;
308 unsigned long i, count, total = 0;
309 unsigned long idx;
310 unsigned long *map;
311 int gofast = 0;
312
313 BUG_ON(!bdata->node_bootmem_map);
314
315 count = 0;
316
317 pfn = PFN_DOWN(bdata->node_boot_start);
318 idx = bdata->node_low_pfn - pfn;
319 map = bdata->node_bootmem_map;
320
321 if (bdata->node_boot_start == 0 ||
322 ffs(bdata->node_boot_start) - PAGE_SHIFT > ffs(BITS_PER_LONG))
323 gofast = 1;
324 for (i = 0; i < idx; ) {
325 unsigned long v = ~map[i / BITS_PER_LONG];
326
327 if (gofast && v == ~0UL) {
328 int order;
329
330 page = pfn_to_page(pfn);
331 count += BITS_PER_LONG;
332 order = ffs(BITS_PER_LONG) - 1;
333 __free_pages_bootmem(page, order);
334 i += BITS_PER_LONG;
335 page += BITS_PER_LONG;
336 } else if (v) {
337 unsigned long m;
338
339 page = pfn_to_page(pfn);
340 for (m = 1; m && i < idx; m<<=1, page++, i++) {
341 if (v & m) {
342 count++;
343 __free_pages_bootmem(page, 0);
344 }
345 }
346 } else {
347 i += BITS_PER_LONG;
348 }
349 pfn += BITS_PER_LONG;
350 }
351 total += count;
352
353
354
355
356
357 page = virt_to_page(bdata->node_bootmem_map);
358 count = 0;
359 idx = (get_mapsize(bdata) + PAGE_SIZE-1) >> PAGE_SHIFT;
360 for (i = 0; i < idx; i++, page++) {
361 __free_pages_bootmem(page, 0);
362 count++;
363 }
364 total += count;
365 bdata->node_bootmem_map = NULL;
366
367 return total;
368}
369
370unsigned long __init init_bootmem_node(pg_data_t *pgdat, unsigned long freepfn,
371 unsigned long startpfn, unsigned long endpfn)
372{
373 return init_bootmem_core(pgdat, freepfn, startpfn, endpfn);
374}
375
376void __init reserve_bootmem_node(pg_data_t *pgdat, unsigned long physaddr,
377 unsigned long size)
378{
379 reserve_bootmem_core(pgdat->bdata, physaddr, size);
380}
381
382void __init free_bootmem_node(pg_data_t *pgdat, unsigned long physaddr,
383 unsigned long size)
384{
385 free_bootmem_core(pgdat->bdata, physaddr, size);
386}
387
388unsigned long __init free_all_bootmem_node(pg_data_t *pgdat)
389{
390 return free_all_bootmem_core(pgdat);
391}
392
393unsigned long __init init_bootmem(unsigned long start, unsigned long pages)
394{
395 max_low_pfn = pages;
396 min_low_pfn = start;
397 return init_bootmem_core(NODE_DATA(0), start, 0, pages);
398}
399
400#ifndef CONFIG_HAVE_ARCH_BOOTMEM_NODE
401void __init reserve_bootmem(unsigned long addr, unsigned long size)
402{
403 reserve_bootmem_core(NODE_DATA(0)->bdata, addr, size);
404}
405#endif
406
407void __init free_bootmem(unsigned long addr, unsigned long size)
408{
409 free_bootmem_core(NODE_DATA(0)->bdata, addr, size);
410}
411
412unsigned long __init free_all_bootmem(void)
413{
414 return free_all_bootmem_core(NODE_DATA(0));
415}
416
417void * __init __alloc_bootmem_nopanic(unsigned long size, unsigned long align,
418 unsigned long goal)
419{
420 bootmem_data_t *bdata;
421 void *ptr;
422
423 list_for_each_entry(bdata, &bdata_list, list) {
424 ptr = __alloc_bootmem_core(bdata, size, align, goal, 0);
425 if (ptr)
426 return ptr;
427 }
428 return NULL;
429}
430
431void * __init __alloc_bootmem(unsigned long size, unsigned long align,
432 unsigned long goal)
433{
434 void *mem = __alloc_bootmem_nopanic(size,align,goal);
435
436 if (mem)
437 return mem;
438
439
440
441 printk(KERN_ALERT "bootmem alloc of %lu bytes failed!\n", size);
442 panic("Out of memory");
443 return NULL;
444}
445
446
447void * __init __alloc_bootmem_node(pg_data_t *pgdat, unsigned long size,
448 unsigned long align, unsigned long goal)
449{
450 void *ptr;
451
452 ptr = __alloc_bootmem_core(pgdat->bdata, size, align, goal, 0);
453 if (ptr)
454 return ptr;
455
456 return __alloc_bootmem(size, align, goal);
457}
458
459#ifndef ARCH_LOW_ADDRESS_LIMIT
460#define ARCH_LOW_ADDRESS_LIMIT 0xffffffffUL
461#endif
462
463void * __init __alloc_bootmem_low(unsigned long size, unsigned long align,
464 unsigned long goal)
465{
466 bootmem_data_t *bdata;
467 void *ptr;
468
469 list_for_each_entry(bdata, &bdata_list, list) {
470 ptr = __alloc_bootmem_core(bdata, size, align, goal,
471 ARCH_LOW_ADDRESS_LIMIT);
472 if (ptr)
473 return ptr;
474 }
475
476
477
478
479 printk(KERN_ALERT "low bootmem alloc of %lu bytes failed!\n", size);
480 panic("Out of low memory");
481 return NULL;
482}
483
484void * __init __alloc_bootmem_low_node(pg_data_t *pgdat, unsigned long size,
485 unsigned long align, unsigned long goal)
486{
487 return __alloc_bootmem_core(pgdat->bdata, size, align, goal,
488 ARCH_LOW_ADDRESS_LIMIT);
489}
490