ab5c9abd5c345e1eb9ed369027e75c0f86c96d84
[linux-3.10.git] / arch / arm / mm / init.c
1 /*
2  *  linux/arch/arm/mm/init.c
3  *
4  *  Copyright (C) 1995-2005 Russell King
5  *
6  * This program is free software; you can redistribute it and/or modify
7  * it under the terms of the GNU General Public License version 2 as
8  * published by the Free Software Foundation.
9  */
10 #include <linux/kernel.h>
11 #include <linux/errno.h>
12 #include <linux/swap.h>
13 #include <linux/init.h>
14 #include <linux/bootmem.h>
15 #include <linux/mman.h>
16 #include <linux/nodemask.h>
17 #include <linux/initrd.h>
18
19 #include <asm/mach-types.h>
20 #include <asm/setup.h>
21 #include <asm/sizes.h>
22 #include <asm/tlb.h>
23
24 #include <asm/mach/arch.h>
25 #include <asm/mach/map.h>
26
27 #include "mm.h"
28
29 static unsigned long phys_initrd_start __initdata = 0;
30 static unsigned long phys_initrd_size __initdata = 0;
31
32 static void __init early_initrd(char **p)
33 {
34         unsigned long start, size;
35
36         start = memparse(*p, p);
37         if (**p == ',') {
38                 size = memparse((*p) + 1, p);
39
40                 phys_initrd_start = start;
41                 phys_initrd_size = size;
42         }
43 }
44 __early_param("initrd=", early_initrd);
45
46 static int __init parse_tag_initrd(const struct tag *tag)
47 {
48         printk(KERN_WARNING "ATAG_INITRD is deprecated; "
49                 "please update your bootloader.\n");
50         phys_initrd_start = __virt_to_phys(tag->u.initrd.start);
51         phys_initrd_size = tag->u.initrd.size;
52         return 0;
53 }
54
55 __tagtable(ATAG_INITRD, parse_tag_initrd);
56
57 static int __init parse_tag_initrd2(const struct tag *tag)
58 {
59         phys_initrd_start = tag->u.initrd.start;
60         phys_initrd_size = tag->u.initrd.size;
61         return 0;
62 }
63
64 __tagtable(ATAG_INITRD2, parse_tag_initrd2);
65
66 /*
67  * This keeps memory configuration data used by a couple memory
68  * initialization functions, as well as show_mem() for the skipping
69  * of holes in the memory map.  It is populated by arm_add_memory().
70  */
71 struct meminfo meminfo;
72
73 void show_mem(void)
74 {
75         int free = 0, total = 0, reserved = 0;
76         int shared = 0, cached = 0, slab = 0, node, i;
77         struct meminfo * mi = &meminfo;
78
79         printk("Mem-info:\n");
80         show_free_areas();
81         for_each_online_node(node) {
82                 pg_data_t *n = NODE_DATA(node);
83                 struct page *map = pgdat_page_nr(n, 0) - n->node_start_pfn;
84
85                 for_each_nodebank (i,mi,node) {
86                         struct membank *bank = &mi->bank[i];
87                         unsigned int pfn1, pfn2;
88                         struct page *page, *end;
89
90                         pfn1 = bank_pfn_start(bank);
91                         pfn2 = bank_pfn_end(bank);
92
93                         page = map + pfn1;
94                         end  = map + pfn2;
95
96                         do {
97                                 total++;
98                                 if (PageReserved(page))
99                                         reserved++;
100                                 else if (PageSwapCache(page))
101                                         cached++;
102                                 else if (PageSlab(page))
103                                         slab++;
104                                 else if (!page_count(page))
105                                         free++;
106                                 else
107                                         shared += page_count(page) - 1;
108                                 page++;
109                         } while (page < end);
110                 }
111         }
112
113         printk("%d pages of RAM\n", total);
114         printk("%d free pages\n", free);
115         printk("%d reserved pages\n", reserved);
116         printk("%d slab pages\n", slab);
117         printk("%d pages shared\n", shared);
118         printk("%d pages swap cached\n", cached);
119 }
120
121 /*
122  * FIXME: We really want to avoid allocating the bootmap bitmap
123  * over the top of the initrd.  Hopefully, this is located towards
124  * the start of a bank, so if we allocate the bootmap bitmap at
125  * the end, we won't clash.
126  */
127 static unsigned int __init
128 find_bootmap_pfn(int node, struct meminfo *mi, unsigned int bootmap_pages)
129 {
130         unsigned int start_pfn, i, bootmap_pfn;
131
132         start_pfn   = PAGE_ALIGN(__pa(&_end)) >> PAGE_SHIFT;
133         bootmap_pfn = 0;
134
135         for_each_nodebank(i, mi, node) {
136                 struct membank *bank = &mi->bank[i];
137                 unsigned int start, end;
138
139                 start = bank_pfn_start(bank);
140                 end   = bank_pfn_end(bank);
141
142                 if (end < start_pfn)
143                         continue;
144
145                 if (start < start_pfn)
146                         start = start_pfn;
147
148                 if (end <= start)
149                         continue;
150
151                 if (end - start >= bootmap_pages) {
152                         bootmap_pfn = start;
153                         break;
154                 }
155         }
156
157         if (bootmap_pfn == 0)
158                 BUG();
159
160         return bootmap_pfn;
161 }
162
163 static int __init check_initrd(struct meminfo *mi)
164 {
165         int initrd_node = -2;
166 #ifdef CONFIG_BLK_DEV_INITRD
167         unsigned long end = phys_initrd_start + phys_initrd_size;
168
169         /*
170          * Make sure that the initrd is within a valid area of
171          * memory.
172          */
173         if (phys_initrd_size) {
174                 unsigned int i;
175
176                 initrd_node = -1;
177
178                 for (i = 0; i < mi->nr_banks; i++) {
179                         struct membank *bank = &mi->bank[i];
180                         if (bank_phys_start(bank) <= phys_initrd_start &&
181                             end <= bank_phys_end(bank))
182                                 initrd_node = bank->node;
183                 }
184         }
185
186         if (initrd_node == -1) {
187                 printk(KERN_ERR "INITRD: 0x%08lx+0x%08lx extends beyond "
188                        "physical memory - disabling initrd\n",
189                        phys_initrd_start, phys_initrd_size);
190                 phys_initrd_start = phys_initrd_size = 0;
191         }
192 #endif
193
194         return initrd_node;
195 }
196
197 static inline void map_memory_bank(struct membank *bank)
198 {
199 #ifdef CONFIG_MMU
200         struct map_desc map;
201
202         map.pfn = bank_pfn_start(bank);
203         map.virtual = __phys_to_virt(bank_phys_start(bank));
204         map.length = bank_phys_size(bank);
205         map.type = MT_MEMORY;
206
207         create_mapping(&map);
208 #endif
209 }
210
211 static unsigned long __init bootmem_init_node(int node, struct meminfo *mi)
212 {
213         unsigned long start_pfn, end_pfn, boot_pfn;
214         unsigned int boot_pages;
215         pg_data_t *pgdat;
216         int i;
217
218         start_pfn = -1UL;
219         end_pfn = 0;
220
221         /*
222          * Calculate the pfn range, and map the memory banks for this node.
223          */
224         for_each_nodebank(i, mi, node) {
225                 struct membank *bank = &mi->bank[i];
226                 unsigned long start, end;
227
228                 start = bank_pfn_start(bank);
229                 end = bank_pfn_end(bank);
230
231                 if (start_pfn > start)
232                         start_pfn = start;
233                 if (end_pfn < end)
234                         end_pfn = end;
235
236                 map_memory_bank(bank);
237         }
238
239         /*
240          * If there is no memory in this node, ignore it.
241          */
242         if (end_pfn == 0)
243                 return end_pfn;
244
245         /*
246          * Allocate the bootmem bitmap page.
247          */
248         boot_pages = bootmem_bootmap_pages(end_pfn - start_pfn);
249         boot_pfn = find_bootmap_pfn(node, mi, boot_pages);
250
251         /*
252          * Initialise the bootmem allocator for this node, handing the
253          * memory banks over to bootmem.
254          */
255         node_set_online(node);
256         pgdat = NODE_DATA(node);
257         init_bootmem_node(pgdat, boot_pfn, start_pfn, end_pfn);
258
259         for_each_nodebank(i, mi, node) {
260                 struct membank *bank = &mi->bank[i];
261                 free_bootmem_node(pgdat, bank_phys_start(bank), bank_phys_size(bank));
262                 memory_present(node, bank_pfn_start(bank), bank_pfn_end(bank));
263         }
264
265         /*
266          * Reserve the bootmem bitmap for this node.
267          */
268         reserve_bootmem_node(pgdat, boot_pfn << PAGE_SHIFT,
269                              boot_pages << PAGE_SHIFT, BOOTMEM_DEFAULT);
270
271         return end_pfn;
272 }
273
274 static void __init bootmem_reserve_initrd(int node)
275 {
276 #ifdef CONFIG_BLK_DEV_INITRD
277         pg_data_t *pgdat = NODE_DATA(node);
278         int res;
279
280         res = reserve_bootmem_node(pgdat, phys_initrd_start,
281                              phys_initrd_size, BOOTMEM_EXCLUSIVE);
282
283         if (res == 0) {
284                 initrd_start = __phys_to_virt(phys_initrd_start);
285                 initrd_end = initrd_start + phys_initrd_size;
286         } else {
287                 printk(KERN_ERR
288                         "INITRD: 0x%08lx+0x%08lx overlaps in-use "
289                         "memory region - disabling initrd\n",
290                         phys_initrd_start, phys_initrd_size);
291         }
292 #endif
293 }
294
295 static void __init bootmem_free_node(int node, struct meminfo *mi)
296 {
297         unsigned long zone_size[MAX_NR_ZONES], zhole_size[MAX_NR_ZONES];
298         unsigned long start_pfn, end_pfn;
299         pg_data_t *pgdat = NODE_DATA(node);
300         int i;
301
302         start_pfn = pgdat->bdata->node_min_pfn;
303         end_pfn = pgdat->bdata->node_low_pfn;
304
305         /*
306          * initialise the zones within this node.
307          */
308         memset(zone_size, 0, sizeof(zone_size));
309         memset(zhole_size, 0, sizeof(zhole_size));
310
311         /*
312          * The size of this node has already been determined.  If we need
313          * to do anything fancy with the allocation of this memory to the
314          * zones, now is the time to do it.
315          */
316         zone_size[0] = end_pfn - start_pfn;
317
318         /*
319          * For each bank in this node, calculate the size of the holes.
320          *  holes = node_size - sum(bank_sizes_in_node)
321          */
322         zhole_size[0] = zone_size[0];
323         for_each_nodebank(i, mi, node)
324                 zhole_size[0] -= bank_pfn_size(&mi->bank[i]);
325
326         /*
327          * Adjust the sizes according to any special requirements for
328          * this machine type.
329          */
330         arch_adjust_zones(node, zone_size, zhole_size);
331
332         free_area_init_node(node, zone_size, start_pfn, zhole_size);
333 }
334
335 void __init bootmem_init(void)
336 {
337         struct meminfo *mi = &meminfo;
338         unsigned long memend_pfn = 0;
339         int node, initrd_node;
340
341         /*
342          * Locate which node contains the ramdisk image, if any.
343          */
344         initrd_node = check_initrd(mi);
345
346         /*
347          * Run through each node initialising the bootmem allocator.
348          */
349         for_each_node(node) {
350                 unsigned long end_pfn = bootmem_init_node(node, mi);
351
352                 /*
353                  * Reserve any special node zero regions.
354                  */
355                 if (node == 0)
356                         reserve_node_zero(NODE_DATA(node));
357
358                 /*
359                  * If the initrd is in this node, reserve its memory.
360                  */
361                 if (node == initrd_node)
362                         bootmem_reserve_initrd(node);
363
364                 /*
365                  * Remember the highest memory PFN.
366                  */
367                 if (end_pfn > memend_pfn)
368                         memend_pfn = end_pfn;
369         }
370
371         /*
372          * sparse_init() needs the bootmem allocator up and running.
373          */
374         sparse_init();
375
376         /*
377          * Now free memory in each node - free_area_init_node needs
378          * the sparse mem_map arrays initialized by sparse_init()
379          * for memmap_init_zone(), otherwise all PFNs are invalid.
380          */
381         for_each_node(node)
382                 bootmem_free_node(node, mi);
383
384         high_memory = __va(memend_pfn << PAGE_SHIFT);
385
386         /*
387          * This doesn't seem to be used by the Linux memory manager any
388          * more, but is used by ll_rw_block.  If we can get rid of it, we
389          * also get rid of some of the stuff above as well.
390          *
391          * Note: max_low_pfn and max_pfn reflect the number of _pages_ in
392          * the system, not the maximum PFN.
393          */
394         max_pfn = max_low_pfn = memend_pfn - PHYS_PFN_OFFSET;
395 }
396
397 static inline int free_area(unsigned long pfn, unsigned long end, char *s)
398 {
399         unsigned int pages = 0, size = (end - pfn) << (PAGE_SHIFT - 10);
400
401         for (; pfn < end; pfn++) {
402                 struct page *page = pfn_to_page(pfn);
403                 ClearPageReserved(page);
404                 init_page_count(page);
405                 __free_page(page);
406                 pages++;
407         }
408
409         if (size && s)
410                 printk(KERN_INFO "Freeing %s memory: %dK\n", s, size);
411
412         return pages;
413 }
414
415 static inline void
416 free_memmap(int node, unsigned long start_pfn, unsigned long end_pfn)
417 {
418         struct page *start_pg, *end_pg;
419         unsigned long pg, pgend;
420
421         /*
422          * Convert start_pfn/end_pfn to a struct page pointer.
423          */
424         start_pg = pfn_to_page(start_pfn);
425         end_pg = pfn_to_page(end_pfn);
426
427         /*
428          * Convert to physical addresses, and
429          * round start upwards and end downwards.
430          */
431         pg = PAGE_ALIGN(__pa(start_pg));
432         pgend = __pa(end_pg) & PAGE_MASK;
433
434         /*
435          * If there are free pages between these,
436          * free the section of the memmap array.
437          */
438         if (pg < pgend)
439                 free_bootmem_node(NODE_DATA(node), pg, pgend - pg);
440 }
441
442 /*
443  * The mem_map array can get very big.  Free the unused area of the memory map.
444  */
445 static void __init free_unused_memmap_node(int node, struct meminfo *mi)
446 {
447         unsigned long bank_start, prev_bank_end = 0;
448         unsigned int i;
449
450         /*
451          * [FIXME] This relies on each bank being in address order.  This
452          * may not be the case, especially if the user has provided the
453          * information on the command line.
454          */
455         for_each_nodebank(i, mi, node) {
456                 struct membank *bank = &mi->bank[i];
457
458                 bank_start = bank_pfn_start(bank);
459                 if (bank_start < prev_bank_end) {
460                         printk(KERN_ERR "MEM: unordered memory banks.  "
461                                 "Not freeing memmap.\n");
462                         break;
463                 }
464
465                 /*
466                  * If we had a previous bank, and there is a space
467                  * between the current bank and the previous, free it.
468                  */
469                 if (prev_bank_end && prev_bank_end != bank_start)
470                         free_memmap(node, prev_bank_end, bank_start);
471
472                 prev_bank_end = bank_pfn_end(bank);
473         }
474 }
475
476 /*
477  * mem_init() marks the free areas in the mem_map and tells us how much
478  * memory is free.  This is done after various parts of the system have
479  * claimed their memory after the kernel image.
480  */
481 void __init mem_init(void)
482 {
483         unsigned int codesize, datasize, initsize;
484         int i, node;
485
486 #ifndef CONFIG_DISCONTIGMEM
487         max_mapnr   = virt_to_page(high_memory) - mem_map;
488 #endif
489
490         /* this will put all unused low memory onto the freelists */
491         for_each_online_node(node) {
492                 pg_data_t *pgdat = NODE_DATA(node);
493
494                 free_unused_memmap_node(node, &meminfo);
495
496                 if (pgdat->node_spanned_pages != 0)
497                         totalram_pages += free_all_bootmem_node(pgdat);
498         }
499
500 #ifdef CONFIG_SA1111
501         /* now that our DMA memory is actually so designated, we can free it */
502         totalram_pages += free_area(PHYS_PFN_OFFSET,
503                                     __phys_to_pfn(__pa(swapper_pg_dir)), NULL);
504 #endif
505
506         /*
507          * Since our memory may not be contiguous, calculate the
508          * real number of pages we have in this system
509          */
510         printk(KERN_INFO "Memory:");
511         num_physpages = 0;
512         for (i = 0; i < meminfo.nr_banks; i++) {
513                 num_physpages += bank_pfn_size(&meminfo.bank[i]);
514                 printk(" %ldMB", bank_phys_size(&meminfo.bank[i]) >> 20);
515         }
516         printk(" = %luMB total\n", num_physpages >> (20 - PAGE_SHIFT));
517
518         codesize = &_etext - &_text;
519         datasize = &_end - &__data_start;
520         initsize = &__init_end - &__init_begin;
521
522         printk(KERN_NOTICE "Memory: %luKB available (%dK code, "
523                 "%dK data, %dK init)\n",
524                 (unsigned long) nr_free_pages() << (PAGE_SHIFT-10),
525                 codesize >> 10, datasize >> 10, initsize >> 10);
526
527         if (PAGE_SIZE >= 16384 && num_physpages <= 128) {
528                 extern int sysctl_overcommit_memory;
529                 /*
530                  * On a machine this small we won't get
531                  * anywhere without overcommit, so turn
532                  * it on by default.
533                  */
534                 sysctl_overcommit_memory = OVERCOMMIT_ALWAYS;
535         }
536 }
537
538 void free_initmem(void)
539 {
540         if (!machine_is_integrator() && !machine_is_cintegrator())
541                 totalram_pages += free_area(__phys_to_pfn(__pa(&__init_begin)),
542                                             __phys_to_pfn(__pa(&__init_end)),
543                                             "init");
544 }
545
546 #ifdef CONFIG_BLK_DEV_INITRD
547
548 static int keep_initrd;
549
550 void free_initrd_mem(unsigned long start, unsigned long end)
551 {
552         if (!keep_initrd)
553                 totalram_pages += free_area(__phys_to_pfn(__pa(start)),
554                                             __phys_to_pfn(__pa(end)),
555                                             "initrd");
556 }
557
558 static int __init keepinitrd_setup(char *__unused)
559 {
560         keep_initrd = 1;
561         return 1;
562 }
563
564 __setup("keepinitrd", keepinitrd_setup);
565 #endif