Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * linux/arch/arm/mm/init.c | |
3 | * | |
90072059 | 4 | * Copyright (C) 1995-2005 Russell King |
1da177e4 LT |
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 | */ | |
1da177e4 LT |
10 | #include <linux/kernel.h> |
11 | #include <linux/errno.h> | |
1da177e4 LT |
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> | |
3835f6cb | 18 | #include <linux/highmem.h> |
5a0e3ad6 | 19 | #include <linux/gfp.h> |
2778f620 | 20 | #include <linux/memblock.h> |
7dc50ec7 | 21 | #include <linux/sort.h> |
1da177e4 LT |
22 | |
23 | #include <asm/mach-types.h> | |
37efe642 | 24 | #include <asm/sections.h> |
1da177e4 | 25 | #include <asm/setup.h> |
74d02fb9 | 26 | #include <asm/sizes.h> |
1da177e4 | 27 | #include <asm/tlb.h> |
db9ef1af | 28 | #include <asm/fixmap.h> |
1da177e4 LT |
29 | |
30 | #include <asm/mach/arch.h> | |
31 | #include <asm/mach/map.h> | |
32 | ||
1b2e2b73 RK |
33 | #include "mm.h" |
34 | ||
012d1f4a RK |
35 | static unsigned long phys_initrd_start __initdata = 0; |
36 | static unsigned long phys_initrd_size __initdata = 0; | |
37 | ||
2b0d8c25 | 38 | static int __init early_initrd(char *p) |
012d1f4a RK |
39 | { |
40 | unsigned long start, size; | |
2b0d8c25 | 41 | char *endp; |
012d1f4a | 42 | |
2b0d8c25 JK |
43 | start = memparse(p, &endp); |
44 | if (*endp == ',') { | |
45 | size = memparse(endp + 1, NULL); | |
012d1f4a RK |
46 | |
47 | phys_initrd_start = start; | |
48 | phys_initrd_size = size; | |
49 | } | |
2b0d8c25 | 50 | return 0; |
012d1f4a | 51 | } |
2b0d8c25 | 52 | early_param("initrd", early_initrd); |
012d1f4a RK |
53 | |
54 | static int __init parse_tag_initrd(const struct tag *tag) | |
55 | { | |
56 | printk(KERN_WARNING "ATAG_INITRD is deprecated; " | |
57 | "please update your bootloader.\n"); | |
58 | phys_initrd_start = __virt_to_phys(tag->u.initrd.start); | |
59 | phys_initrd_size = tag->u.initrd.size; | |
60 | return 0; | |
61 | } | |
62 | ||
63 | __tagtable(ATAG_INITRD, parse_tag_initrd); | |
64 | ||
65 | static int __init parse_tag_initrd2(const struct tag *tag) | |
66 | { | |
67 | phys_initrd_start = tag->u.initrd.start; | |
68 | phys_initrd_size = tag->u.initrd.size; | |
69 | return 0; | |
70 | } | |
71 | ||
72 | __tagtable(ATAG_INITRD2, parse_tag_initrd2); | |
1da177e4 LT |
73 | |
74 | /* | |
4b5f32ce NP |
75 | * This keeps memory configuration data used by a couple memory |
76 | * initialization functions, as well as show_mem() for the skipping | |
77 | * of holes in the memory map. It is populated by arm_add_memory(). | |
1da177e4 | 78 | */ |
4b5f32ce | 79 | struct meminfo meminfo; |
5e709827 | 80 | |
b2b755b5 | 81 | void show_mem(unsigned int filter) |
1da177e4 LT |
82 | { |
83 | int free = 0, total = 0, reserved = 0; | |
be370302 | 84 | int shared = 0, cached = 0, slab = 0, i; |
5e709827 | 85 | struct meminfo * mi = &meminfo; |
1da177e4 LT |
86 | |
87 | printk("Mem-info:\n"); | |
7bf02ea2 | 88 | show_free_areas(filter); |
be370302 RK |
89 | |
90 | for_each_bank (i, mi) { | |
91 | struct membank *bank = &mi->bank[i]; | |
92 | unsigned int pfn1, pfn2; | |
93 | struct page *page, *end; | |
94 | ||
95 | pfn1 = bank_pfn_start(bank); | |
96 | pfn2 = bank_pfn_end(bank); | |
97 | ||
98 | page = pfn_to_page(pfn1); | |
99 | end = pfn_to_page(pfn2 - 1) + 1; | |
100 | ||
101 | do { | |
102 | total++; | |
103 | if (PageReserved(page)) | |
104 | reserved++; | |
105 | else if (PageSwapCache(page)) | |
106 | cached++; | |
107 | else if (PageSlab(page)) | |
108 | slab++; | |
109 | else if (!page_count(page)) | |
110 | free++; | |
111 | else | |
112 | shared += page_count(page) - 1; | |
113 | page++; | |
114 | } while (page < end); | |
1da177e4 LT |
115 | } |
116 | ||
117 | printk("%d pages of RAM\n", total); | |
118 | printk("%d free pages\n", free); | |
119 | printk("%d reserved pages\n", reserved); | |
120 | printk("%d slab pages\n", slab); | |
121 | printk("%d pages shared\n", shared); | |
122 | printk("%d pages swap cached\n", cached); | |
123 | } | |
124 | ||
f25b4b4c RK |
125 | static void __init find_limits(unsigned long *min, unsigned long *max_low, |
126 | unsigned long *max_high) | |
dde5828f | 127 | { |
f25b4b4c | 128 | struct meminfo *mi = &meminfo; |
dde5828f RK |
129 | int i; |
130 | ||
131 | *min = -1UL; | |
132 | *max_low = *max_high = 0; | |
133 | ||
be370302 | 134 | for_each_bank (i, mi) { |
dde5828f RK |
135 | struct membank *bank = &mi->bank[i]; |
136 | unsigned long start, end; | |
137 | ||
138 | start = bank_pfn_start(bank); | |
139 | end = bank_pfn_end(bank); | |
140 | ||
141 | if (*min > start) | |
142 | *min = start; | |
143 | if (*max_high < end) | |
144 | *max_high = end; | |
145 | if (bank->highmem) | |
146 | continue; | |
147 | if (*max_low < end) | |
148 | *max_low = end; | |
149 | } | |
150 | } | |
151 | ||
a801d276 RK |
152 | static void __init arm_bootmem_init(unsigned long start_pfn, |
153 | unsigned long end_pfn) | |
1da177e4 | 154 | { |
719c1514 | 155 | struct memblock_region *reg; |
90072059 | 156 | unsigned int boot_pages; |
2778f620 | 157 | phys_addr_t bitmap; |
90072059 | 158 | pg_data_t *pgdat; |
1da177e4 | 159 | |
90072059 | 160 | /* |
2778f620 RK |
161 | * Allocate the bootmem bitmap page. This must be in a region |
162 | * of memory which has already been mapped. | |
90072059 RK |
163 | */ |
164 | boot_pages = bootmem_bootmap_pages(end_pfn - start_pfn); | |
2778f620 RK |
165 | bitmap = memblock_alloc_base(boot_pages << PAGE_SHIFT, L1_CACHE_BYTES, |
166 | __pfn_to_phys(end_pfn)); | |
1da177e4 | 167 | |
90072059 | 168 | /* |
be370302 | 169 | * Initialise the bootmem allocator, handing the |
90072059 RK |
170 | * memory banks over to bootmem. |
171 | */ | |
be370302 RK |
172 | node_set_online(0); |
173 | pgdat = NODE_DATA(0); | |
2778f620 | 174 | init_bootmem_node(pgdat, __phys_to_pfn(bitmap), start_pfn, end_pfn); |
1da177e4 | 175 | |
a801d276 RK |
176 | /* Free the lowmem regions from memblock into bootmem. */ |
177 | for_each_memblock(memory, reg) { | |
178 | unsigned long start = memblock_region_memory_base_pfn(reg); | |
179 | unsigned long end = memblock_region_memory_end_pfn(reg); | |
180 | ||
181 | if (end >= end_pfn) | |
182 | end = end_pfn; | |
183 | if (start >= end) | |
184 | break; | |
185 | ||
186 | free_bootmem(__pfn_to_phys(start), (end - start) << PAGE_SHIFT); | |
d2a38ef9 | 187 | } |
90072059 | 188 | |
a801d276 | 189 | /* Reserve the lowmem memblock reserved regions in bootmem. */ |
719c1514 | 190 | for_each_memblock(reserved, reg) { |
a801d276 RK |
191 | unsigned long start = memblock_region_reserved_base_pfn(reg); |
192 | unsigned long end = memblock_region_reserved_end_pfn(reg); | |
193 | ||
194 | if (end >= end_pfn) | |
195 | end = end_pfn; | |
196 | if (start >= end) | |
197 | break; | |
198 | ||
199 | reserve_bootmem(__pfn_to_phys(start), | |
200 | (end - start) << PAGE_SHIFT, BOOTMEM_DEFAULT); | |
1da177e4 | 201 | } |
b7a69ac3 RK |
202 | } |
203 | ||
be20902b RK |
204 | #ifdef CONFIG_ZONE_DMA |
205 | static void __init arm_adjust_dma_zone(unsigned long *size, unsigned long *hole, | |
206 | unsigned long dma_size) | |
207 | { | |
208 | if (size[0] <= dma_size) | |
209 | return; | |
210 | ||
211 | size[ZONE_NORMAL] = size[0] - dma_size; | |
212 | size[ZONE_DMA] = dma_size; | |
213 | hole[ZONE_NORMAL] = hole[0]; | |
214 | hole[ZONE_DMA] = 0; | |
215 | } | |
216 | #endif | |
217 | ||
a2c54d2a RK |
218 | static void __init arm_bootmem_free(unsigned long min, unsigned long max_low, |
219 | unsigned long max_high) | |
b7a69ac3 RK |
220 | { |
221 | unsigned long zone_size[MAX_NR_ZONES], zhole_size[MAX_NR_ZONES]; | |
a2c54d2a | 222 | struct memblock_region *reg; |
b7a69ac3 | 223 | |
90072059 | 224 | /* |
be370302 | 225 | * initialise the zones. |
90072059 RK |
226 | */ |
227 | memset(zone_size, 0, sizeof(zone_size)); | |
90072059 RK |
228 | |
229 | /* | |
be370302 RK |
230 | * The memory size has already been determined. If we need |
231 | * to do anything fancy with the allocation of this memory | |
232 | * to the zones, now is the time to do it. | |
90072059 | 233 | */ |
dde5828f RK |
234 | zone_size[0] = max_low - min; |
235 | #ifdef CONFIG_HIGHMEM | |
236 | zone_size[ZONE_HIGHMEM] = max_high - max_low; | |
237 | #endif | |
90072059 RK |
238 | |
239 | /* | |
be370302 RK |
240 | * Calculate the size of the holes. |
241 | * holes = node_size - sum(bank_sizes) | |
90072059 | 242 | */ |
dde5828f | 243 | memcpy(zhole_size, zone_size, sizeof(zhole_size)); |
a2c54d2a RK |
244 | for_each_memblock(memory, reg) { |
245 | unsigned long start = memblock_region_memory_base_pfn(reg); | |
246 | unsigned long end = memblock_region_memory_end_pfn(reg); | |
247 | ||
248 | if (start < max_low) { | |
249 | unsigned long low_end = min(end, max_low); | |
250 | zhole_size[0] -= low_end - start; | |
251 | } | |
dde5828f | 252 | #ifdef CONFIG_HIGHMEM |
a2c54d2a RK |
253 | if (end > max_low) { |
254 | unsigned long high_start = max(start, max_low); | |
255 | zhole_size[ZONE_HIGHMEM] -= end - high_start; | |
256 | } | |
dde5828f | 257 | #endif |
dde5828f | 258 | } |
90072059 | 259 | |
be20902b RK |
260 | #ifdef ARM_DMA_ZONE_SIZE |
261 | #ifndef CONFIG_ZONE_DMA | |
262 | #error ARM_DMA_ZONE_SIZE set but no DMA zone to limit allocations | |
263 | #endif | |
264 | ||
90072059 RK |
265 | /* |
266 | * Adjust the sizes according to any special requirements for | |
267 | * this machine type. | |
268 | */ | |
be20902b RK |
269 | arm_adjust_dma_zone(zone_size, zhole_size, |
270 | ARM_DMA_ZONE_SIZE >> PAGE_SHIFT); | |
271 | #endif | |
90072059 | 272 | |
be370302 | 273 | free_area_init_node(0, zone_size, min, zhole_size); |
1da177e4 LT |
274 | } |
275 | ||
b7cfda9f RK |
276 | #ifndef CONFIG_SPARSEMEM |
277 | int pfn_valid(unsigned long pfn) | |
278 | { | |
5e6f6aa1 | 279 | return memblock_is_memory(pfn << PAGE_SHIFT); |
b7cfda9f RK |
280 | } |
281 | EXPORT_SYMBOL(pfn_valid); | |
657e12fd | 282 | |
eda2e5dc | 283 | static void arm_memory_present(void) |
657e12fd RK |
284 | { |
285 | } | |
286 | #else | |
eda2e5dc | 287 | static void arm_memory_present(void) |
657e12fd | 288 | { |
719c1514 | 289 | struct memblock_region *reg; |
719c1514 | 290 | |
7c996361 | 291 | for_each_memblock(memory, reg) |
c7fc2de0 YL |
292 | memory_present(0, memblock_region_memory_base_pfn(reg), |
293 | memblock_region_memory_end_pfn(reg)); | |
657e12fd | 294 | } |
b7cfda9f RK |
295 | #endif |
296 | ||
7dc50ec7 RK |
297 | static int __init meminfo_cmp(const void *_a, const void *_b) |
298 | { | |
299 | const struct membank *a = _a, *b = _b; | |
300 | long cmp = bank_pfn_start(a) - bank_pfn_start(b); | |
301 | return cmp < 0 ? -1 : cmp > 0 ? 1 : 0; | |
302 | } | |
303 | ||
8d717a52 | 304 | void __init arm_memblock_init(struct meminfo *mi, struct machine_desc *mdesc) |
2778f620 RK |
305 | { |
306 | int i; | |
307 | ||
7dc50ec7 RK |
308 | sort(&meminfo.bank, meminfo.nr_banks, sizeof(meminfo.bank[0]), meminfo_cmp, NULL); |
309 | ||
2778f620 RK |
310 | memblock_init(); |
311 | for (i = 0; i < mi->nr_banks; i++) | |
312 | memblock_add(mi->bank[i].start, mi->bank[i].size); | |
313 | ||
314 | /* Register the kernel text, kernel data and initrd with memblock. */ | |
315 | #ifdef CONFIG_XIP_KERNEL | |
842eab40 | 316 | memblock_reserve(__pa(_sdata), _end - _sdata); |
2778f620 RK |
317 | #else |
318 | memblock_reserve(__pa(_stext), _end - _stext); | |
319 | #endif | |
320 | #ifdef CONFIG_BLK_DEV_INITRD | |
b0a2679d RK |
321 | if (phys_initrd_size && |
322 | memblock_is_region_reserved(phys_initrd_start, phys_initrd_size)) { | |
323 | pr_err("INITRD: 0x%08lx+0x%08lx overlaps in-use memory region - disabling initrd\n", | |
324 | phys_initrd_start, phys_initrd_size); | |
325 | phys_initrd_start = phys_initrd_size = 0; | |
326 | } | |
2778f620 RK |
327 | if (phys_initrd_size) { |
328 | memblock_reserve(phys_initrd_start, phys_initrd_size); | |
329 | ||
330 | /* Now convert initrd to virtual addresses */ | |
331 | initrd_start = __phys_to_virt(phys_initrd_start); | |
332 | initrd_end = initrd_start + phys_initrd_size; | |
333 | } | |
334 | #endif | |
335 | ||
336 | arm_mm_memblock_reserve(); | |
337 | ||
8d717a52 RK |
338 | /* reserve any platform specific memblock areas */ |
339 | if (mdesc->reserve) | |
340 | mdesc->reserve(); | |
341 | ||
2778f620 RK |
342 | memblock_analyze(); |
343 | memblock_dump_all(); | |
344 | } | |
345 | ||
8d717a52 | 346 | void __init bootmem_init(void) |
1da177e4 | 347 | { |
dde5828f | 348 | unsigned long min, max_low, max_high; |
1da177e4 | 349 | |
dde5828f RK |
350 | max_low = max_high = 0; |
351 | ||
f25b4b4c | 352 | find_limits(&min, &max_low, &max_high); |
dde5828f | 353 | |
a801d276 | 354 | arm_bootmem_init(min, max_low); |
dde5828f | 355 | |
be370302 RK |
356 | /* |
357 | * Sparsemem tries to allocate bootmem in memory_present(), | |
358 | * so must be done after the fixed reservations | |
359 | */ | |
eda2e5dc | 360 | arm_memory_present(); |
1da177e4 | 361 | |
b7a69ac3 RK |
362 | /* |
363 | * sparse_init() needs the bootmem allocator up and running. | |
364 | */ | |
365 | sparse_init(); | |
366 | ||
367 | /* | |
be370302 | 368 | * Now free the memory - free_area_init_node needs |
b7a69ac3 RK |
369 | * the sparse mem_map arrays initialized by sparse_init() |
370 | * for memmap_init_zone(), otherwise all PFNs are invalid. | |
371 | */ | |
a2c54d2a | 372 | arm_bootmem_free(min, max_low, max_high); |
b7a69ac3 | 373 | |
cae6292b | 374 | high_memory = __va(((phys_addr_t)max_low << PAGE_SHIFT) - 1) + 1; |
1da177e4 | 375 | |
90072059 RK |
376 | /* |
377 | * This doesn't seem to be used by the Linux memory manager any | |
378 | * more, but is used by ll_rw_block. If we can get rid of it, we | |
379 | * also get rid of some of the stuff above as well. | |
380 | * | |
381 | * Note: max_low_pfn and max_pfn reflect the number of _pages_ in | |
382 | * the system, not the maximum PFN. | |
383 | */ | |
dde5828f RK |
384 | max_low_pfn = max_low - PHYS_PFN_OFFSET; |
385 | max_pfn = max_high - PHYS_PFN_OFFSET; | |
90072059 | 386 | } |
1da177e4 | 387 | |
6db015e4 | 388 | static inline int free_area(unsigned long pfn, unsigned long end, char *s) |
1da177e4 | 389 | { |
6db015e4 | 390 | unsigned int pages = 0, size = (end - pfn) << (PAGE_SHIFT - 10); |
1da177e4 | 391 | |
6db015e4 NP |
392 | for (; pfn < end; pfn++) { |
393 | struct page *page = pfn_to_page(pfn); | |
1da177e4 | 394 | ClearPageReserved(page); |
7835e98b | 395 | init_page_count(page); |
6db015e4 NP |
396 | __free_page(page); |
397 | pages++; | |
1da177e4 LT |
398 | } |
399 | ||
400 | if (size && s) | |
401 | printk(KERN_INFO "Freeing %s memory: %dK\n", s, size); | |
6db015e4 NP |
402 | |
403 | return pages; | |
1da177e4 LT |
404 | } |
405 | ||
a013053d | 406 | static inline void |
be370302 | 407 | free_memmap(unsigned long start_pfn, unsigned long end_pfn) |
a013053d RK |
408 | { |
409 | struct page *start_pg, *end_pg; | |
410 | unsigned long pg, pgend; | |
411 | ||
412 | /* | |
413 | * Convert start_pfn/end_pfn to a struct page pointer. | |
414 | */ | |
3257f43d | 415 | start_pg = pfn_to_page(start_pfn - 1) + 1; |
9af386c8 | 416 | end_pg = pfn_to_page(end_pfn - 1) + 1; |
a013053d RK |
417 | |
418 | /* | |
419 | * Convert to physical addresses, and | |
420 | * round start upwards and end downwards. | |
421 | */ | |
cae6292b WD |
422 | pg = (unsigned long)PAGE_ALIGN(__pa(start_pg)); |
423 | pgend = (unsigned long)__pa(end_pg) & PAGE_MASK; | |
a013053d RK |
424 | |
425 | /* | |
426 | * If there are free pages between these, | |
427 | * free the section of the memmap array. | |
428 | */ | |
429 | if (pg < pgend) | |
be370302 | 430 | free_bootmem(pg, pgend - pg); |
a013053d RK |
431 | } |
432 | ||
433 | /* | |
434 | * The mem_map array can get very big. Free the unused area of the memory map. | |
435 | */ | |
be370302 | 436 | static void __init free_unused_memmap(struct meminfo *mi) |
a013053d RK |
437 | { |
438 | unsigned long bank_start, prev_bank_end = 0; | |
439 | unsigned int i; | |
440 | ||
441 | /* | |
3260e529 MB |
442 | * This relies on each bank being in address order. |
443 | * The banks are sorted previously in bootmem_init(). | |
a013053d | 444 | */ |
be370302 | 445 | for_each_bank(i, mi) { |
d2a38ef9 RK |
446 | struct membank *bank = &mi->bank[i]; |
447 | ||
448 | bank_start = bank_pfn_start(bank); | |
a013053d | 449 | |
9af386c8 WD |
450 | #ifdef CONFIG_SPARSEMEM |
451 | /* | |
452 | * Take care not to free memmap entries that don't exist | |
453 | * due to SPARSEMEM sections which aren't present. | |
454 | */ | |
455 | bank_start = min(bank_start, | |
456 | ALIGN(prev_bank_end, PAGES_PER_SECTION)); | |
457 | #endif | |
a013053d RK |
458 | /* |
459 | * If we had a previous bank, and there is a space | |
460 | * between the current bank and the previous, free it. | |
461 | */ | |
3260e529 | 462 | if (prev_bank_end && prev_bank_end < bank_start) |
be370302 | 463 | free_memmap(prev_bank_end, bank_start); |
a013053d | 464 | |
3260e529 MB |
465 | /* |
466 | * Align up here since the VM subsystem insists that the | |
467 | * memmap entries are valid from the bank end aligned to | |
468 | * MAX_ORDER_NR_PAGES. | |
469 | */ | |
470 | prev_bank_end = ALIGN(bank_pfn_end(bank), MAX_ORDER_NR_PAGES); | |
a013053d | 471 | } |
9af386c8 WD |
472 | |
473 | #ifdef CONFIG_SPARSEMEM | |
474 | if (!IS_ALIGNED(prev_bank_end, PAGES_PER_SECTION)) | |
475 | free_memmap(prev_bank_end, | |
476 | ALIGN(prev_bank_end, PAGES_PER_SECTION)); | |
477 | #endif | |
a013053d RK |
478 | } |
479 | ||
d0e775af RK |
480 | static void __init free_highpages(void) |
481 | { | |
482 | #ifdef CONFIG_HIGHMEM | |
df4f14c7 RK |
483 | unsigned long max_low = max_low_pfn + PHYS_PFN_OFFSET; |
484 | struct memblock_region *mem, *res; | |
d0e775af RK |
485 | |
486 | /* set highmem page free */ | |
df4f14c7 RK |
487 | for_each_memblock(memory, mem) { |
488 | unsigned long start = memblock_region_memory_base_pfn(mem); | |
489 | unsigned long end = memblock_region_memory_end_pfn(mem); | |
490 | ||
491 | /* Ignore complete lowmem entries */ | |
492 | if (end <= max_low) | |
493 | continue; | |
494 | ||
495 | /* Truncate partial highmem entries */ | |
496 | if (start < max_low) | |
497 | start = max_low; | |
498 | ||
499 | /* Find and exclude any reserved regions */ | |
500 | for_each_memblock(reserved, res) { | |
501 | unsigned long res_start, res_end; | |
502 | ||
503 | res_start = memblock_region_reserved_base_pfn(res); | |
504 | res_end = memblock_region_reserved_end_pfn(res); | |
505 | ||
506 | if (res_end < start) | |
507 | continue; | |
508 | if (res_start < start) | |
509 | res_start = start; | |
510 | if (res_start > end) | |
511 | res_start = end; | |
512 | if (res_end > end) | |
513 | res_end = end; | |
514 | if (res_start != start) | |
515 | totalhigh_pages += free_area(start, res_start, | |
516 | NULL); | |
517 | start = res_end; | |
518 | if (start == end) | |
519 | break; | |
520 | } | |
521 | ||
522 | /* And now free anything which remains */ | |
523 | if (start < end) | |
d0e775af RK |
524 | totalhigh_pages += free_area(start, end, NULL); |
525 | } | |
526 | totalram_pages += totalhigh_pages; | |
527 | #endif | |
528 | } | |
529 | ||
1da177e4 LT |
530 | /* |
531 | * mem_init() marks the free areas in the mem_map and tells us how much | |
532 | * memory is free. This is done after various parts of the system have | |
533 | * claimed their memory after the kernel image. | |
534 | */ | |
535 | void __init mem_init(void) | |
536 | { | |
db9ef1af | 537 | unsigned long reserved_pages, free_pages; |
47ea3c15 | 538 | struct memblock_region *reg; |
be370302 | 539 | int i; |
1dbd30e9 LW |
540 | #ifdef CONFIG_HAVE_TCM |
541 | /* These pointers are filled in on TCM detection */ | |
542 | extern u32 dtcm_end; | |
543 | extern u32 itcm_end; | |
544 | #endif | |
1da177e4 | 545 | |
3835f6cb | 546 | max_mapnr = pfn_to_page(max_pfn + PHYS_PFN_OFFSET) - mem_map; |
1da177e4 | 547 | |
1da177e4 | 548 | /* this will put all unused low memory onto the freelists */ |
be370302 | 549 | free_unused_memmap(&meminfo); |
a013053d | 550 | |
be370302 | 551 | totalram_pages += free_all_bootmem(); |
1da177e4 LT |
552 | |
553 | #ifdef CONFIG_SA1111 | |
554 | /* now that our DMA memory is actually so designated, we can free it */ | |
6db015e4 NP |
555 | totalram_pages += free_area(PHYS_PFN_OFFSET, |
556 | __phys_to_pfn(__pa(swapper_pg_dir)), NULL); | |
1da177e4 LT |
557 | #endif |
558 | ||
d0e775af | 559 | free_highpages(); |
3835f6cb | 560 | |
db9ef1af FB |
561 | reserved_pages = free_pages = 0; |
562 | ||
be370302 RK |
563 | for_each_bank(i, &meminfo) { |
564 | struct membank *bank = &meminfo.bank[i]; | |
565 | unsigned int pfn1, pfn2; | |
566 | struct page *page, *end; | |
567 | ||
568 | pfn1 = bank_pfn_start(bank); | |
569 | pfn2 = bank_pfn_end(bank); | |
570 | ||
571 | page = pfn_to_page(pfn1); | |
572 | end = pfn_to_page(pfn2 - 1) + 1; | |
573 | ||
574 | do { | |
575 | if (PageReserved(page)) | |
576 | reserved_pages++; | |
577 | else if (!page_count(page)) | |
578 | free_pages++; | |
579 | page++; | |
580 | } while (page < end); | |
db9ef1af FB |
581 | } |
582 | ||
1da177e4 LT |
583 | /* |
584 | * Since our memory may not be contiguous, calculate the | |
585 | * real number of pages we have in this system | |
586 | */ | |
587 | printk(KERN_INFO "Memory:"); | |
1da177e4 | 588 | num_physpages = 0; |
47ea3c15 RK |
589 | for_each_memblock(memory, reg) { |
590 | unsigned long pages = memblock_region_memory_end_pfn(reg) - | |
591 | memblock_region_memory_base_pfn(reg); | |
592 | num_physpages += pages; | |
593 | printk(" %ldMB", pages >> (20 - PAGE_SHIFT)); | |
1da177e4 | 594 | } |
1da177e4 | 595 | printk(" = %luMB total\n", num_physpages >> (20 - PAGE_SHIFT)); |
6db015e4 | 596 | |
db9ef1af FB |
597 | printk(KERN_NOTICE "Memory: %luk/%luk available, %luk reserved, %luK highmem\n", |
598 | nr_free_pages() << (PAGE_SHIFT-10), | |
599 | free_pages << (PAGE_SHIFT-10), | |
600 | reserved_pages << (PAGE_SHIFT-10), | |
4b529401 | 601 | totalhigh_pages << (PAGE_SHIFT-10)); |
1da177e4 | 602 | |
db9ef1af FB |
603 | #define MLK(b, t) b, t, ((t) - (b)) >> 10 |
604 | #define MLM(b, t) b, t, ((t) - (b)) >> 20 | |
605 | #define MLK_ROUNDUP(b, t) b, t, DIV_ROUND_UP(((t) - (b)), SZ_1K) | |
606 | ||
607 | printk(KERN_NOTICE "Virtual kernel memory layout:\n" | |
608 | " vector : 0x%08lx - 0x%08lx (%4ld kB)\n" | |
07d2a5c7 | 609 | #ifdef CONFIG_HAVE_TCM |
07d2a5c7 | 610 | " DTCM : 0x%08lx - 0x%08lx (%4ld kB)\n" |
07d2a5c7 | 611 | " ITCM : 0x%08lx - 0x%08lx (%4ld kB)\n" |
07d2a5c7 | 612 | #endif |
db9ef1af | 613 | " fixmap : 0x%08lx - 0x%08lx (%4ld kB)\n" |
a7bd08c8 FB |
614 | #ifdef CONFIG_MMU |
615 | " DMA : 0x%08lx - 0x%08lx (%4ld MB)\n" | |
616 | #endif | |
db9ef1af FB |
617 | " vmalloc : 0x%08lx - 0x%08lx (%4ld MB)\n" |
618 | " lowmem : 0x%08lx - 0x%08lx (%4ld MB)\n" | |
619 | #ifdef CONFIG_HIGHMEM | |
620 | " pkmap : 0x%08lx - 0x%08lx (%4ld MB)\n" | |
621 | #endif | |
622 | " modules : 0x%08lx - 0x%08lx (%4ld MB)\n" | |
623 | " .init : 0x%p" " - 0x%p" " (%4d kB)\n" | |
624 | " .text : 0x%p" " - 0x%p" " (%4d kB)\n" | |
625 | " .data : 0x%p" " - 0x%p" " (%4d kB)\n", | |
626 | ||
627 | MLK(UL(CONFIG_VECTORS_BASE), UL(CONFIG_VECTORS_BASE) + | |
628 | (PAGE_SIZE)), | |
07d2a5c7 | 629 | #ifdef CONFIG_HAVE_TCM |
1dbd30e9 LW |
630 | MLK(DTCM_OFFSET, (unsigned long) dtcm_end), |
631 | MLK(ITCM_OFFSET, (unsigned long) itcm_end), | |
07d2a5c7 | 632 | #endif |
db9ef1af | 633 | MLK(FIXADDR_START, FIXADDR_TOP), |
a7bd08c8 FB |
634 | #ifdef CONFIG_MMU |
635 | MLM(CONSISTENT_BASE, CONSISTENT_END), | |
636 | #endif | |
c931b4f6 | 637 | MLM(VMALLOC_START, VMALLOC_END), |
db9ef1af FB |
638 | MLM(PAGE_OFFSET, (unsigned long)high_memory), |
639 | #ifdef CONFIG_HIGHMEM | |
640 | MLM(PKMAP_BASE, (PKMAP_BASE) + (LAST_PKMAP) * | |
641 | (PAGE_SIZE)), | |
642 | #endif | |
643 | MLM(MODULES_VADDR, MODULES_END), | |
644 | ||
645 | MLK_ROUNDUP(__init_begin, __init_end), | |
646 | MLK_ROUNDUP(_text, _etext), | |
842eab40 | 647 | MLK_ROUNDUP(_sdata, _edata)); |
db9ef1af FB |
648 | |
649 | #undef MLK | |
650 | #undef MLM | |
651 | #undef MLK_ROUNDUP | |
652 | ||
a1839272 FB |
653 | /* |
654 | * Check boundaries twice: Some fundamental inconsistencies can | |
655 | * be detected at build time already. | |
656 | */ | |
657 | #ifdef CONFIG_MMU | |
658 | BUILD_BUG_ON(VMALLOC_END > CONSISTENT_BASE); | |
659 | BUG_ON(VMALLOC_END > CONSISTENT_BASE); | |
660 | ||
661 | BUILD_BUG_ON(TASK_SIZE > MODULES_VADDR); | |
662 | BUG_ON(TASK_SIZE > MODULES_VADDR); | |
663 | #endif | |
664 | ||
665 | #ifdef CONFIG_HIGHMEM | |
666 | BUILD_BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE > PAGE_OFFSET); | |
667 | BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE > PAGE_OFFSET); | |
668 | #endif | |
669 | ||
1da177e4 LT |
670 | if (PAGE_SIZE >= 16384 && num_physpages <= 128) { |
671 | extern int sysctl_overcommit_memory; | |
672 | /* | |
673 | * On a machine this small we won't get | |
674 | * anywhere without overcommit, so turn | |
675 | * it on by default. | |
676 | */ | |
677 | sysctl_overcommit_memory = OVERCOMMIT_ALWAYS; | |
678 | } | |
679 | } | |
680 | ||
681 | void free_initmem(void) | |
682 | { | |
bc581770 | 683 | #ifdef CONFIG_HAVE_TCM |
ea208f64 | 684 | extern char __tcm_start, __tcm_end; |
bc581770 | 685 | |
ea208f64 LW |
686 | totalram_pages += free_area(__phys_to_pfn(__pa(&__tcm_start)), |
687 | __phys_to_pfn(__pa(&__tcm_end)), | |
bc581770 LW |
688 | "TCM link"); |
689 | #endif | |
690 | ||
6db015e4 | 691 | if (!machine_is_integrator() && !machine_is_cintegrator()) |
37efe642 RK |
692 | totalram_pages += free_area(__phys_to_pfn(__pa(__init_begin)), |
693 | __phys_to_pfn(__pa(__init_end)), | |
6db015e4 | 694 | "init"); |
1da177e4 LT |
695 | } |
696 | ||
697 | #ifdef CONFIG_BLK_DEV_INITRD | |
698 | ||
699 | static int keep_initrd; | |
700 | ||
701 | void free_initrd_mem(unsigned long start, unsigned long end) | |
702 | { | |
703 | if (!keep_initrd) | |
6db015e4 NP |
704 | totalram_pages += free_area(__phys_to_pfn(__pa(start)), |
705 | __phys_to_pfn(__pa(end)), | |
706 | "initrd"); | |
1da177e4 LT |
707 | } |
708 | ||
709 | static int __init keepinitrd_setup(char *__unused) | |
710 | { | |
711 | keep_initrd = 1; | |
712 | return 1; | |
713 | } | |
714 | ||
715 | __setup("keepinitrd", keepinitrd_setup); | |
716 | #endif |