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> | |
18 | ||
19 | #include <asm/mach-types.h> | |
37efe642 | 20 | #include <asm/sections.h> |
1da177e4 | 21 | #include <asm/setup.h> |
74d02fb9 | 22 | #include <asm/sizes.h> |
1da177e4 LT |
23 | #include <asm/tlb.h> |
24 | ||
25 | #include <asm/mach/arch.h> | |
26 | #include <asm/mach/map.h> | |
27 | ||
1b2e2b73 RK |
28 | #include "mm.h" |
29 | ||
012d1f4a RK |
30 | static unsigned long phys_initrd_start __initdata = 0; |
31 | static unsigned long phys_initrd_size __initdata = 0; | |
32 | ||
33 | static void __init early_initrd(char **p) | |
34 | { | |
35 | unsigned long start, size; | |
36 | ||
37 | start = memparse(*p, p); | |
38 | if (**p == ',') { | |
39 | size = memparse((*p) + 1, p); | |
40 | ||
41 | phys_initrd_start = start; | |
42 | phys_initrd_size = size; | |
43 | } | |
44 | } | |
45 | __early_param("initrd=", early_initrd); | |
46 | ||
47 | static int __init parse_tag_initrd(const struct tag *tag) | |
48 | { | |
49 | printk(KERN_WARNING "ATAG_INITRD is deprecated; " | |
50 | "please update your bootloader.\n"); | |
51 | phys_initrd_start = __virt_to_phys(tag->u.initrd.start); | |
52 | phys_initrd_size = tag->u.initrd.size; | |
53 | return 0; | |
54 | } | |
55 | ||
56 | __tagtable(ATAG_INITRD, parse_tag_initrd); | |
57 | ||
58 | static int __init parse_tag_initrd2(const struct tag *tag) | |
59 | { | |
60 | phys_initrd_start = tag->u.initrd.start; | |
61 | phys_initrd_size = tag->u.initrd.size; | |
62 | return 0; | |
63 | } | |
64 | ||
65 | __tagtable(ATAG_INITRD2, parse_tag_initrd2); | |
1da177e4 LT |
66 | |
67 | /* | |
4b5f32ce NP |
68 | * This keeps memory configuration data used by a couple memory |
69 | * initialization functions, as well as show_mem() for the skipping | |
70 | * of holes in the memory map. It is populated by arm_add_memory(). | |
1da177e4 | 71 | */ |
4b5f32ce | 72 | struct meminfo meminfo; |
5e709827 | 73 | |
1da177e4 LT |
74 | void show_mem(void) |
75 | { | |
76 | int free = 0, total = 0, reserved = 0; | |
5e709827 RL |
77 | int shared = 0, cached = 0, slab = 0, node, i; |
78 | struct meminfo * mi = &meminfo; | |
1da177e4 LT |
79 | |
80 | printk("Mem-info:\n"); | |
81 | show_free_areas(); | |
1da177e4 | 82 | for_each_online_node(node) { |
204ecae4 | 83 | pg_data_t *n = NODE_DATA(node); |
b7a69ac3 | 84 | struct page *map = pgdat_page_nr(n, 0) - n->node_start_pfn; |
204ecae4 | 85 | |
5e709827 | 86 | for_each_nodebank (i,mi,node) { |
d2a38ef9 | 87 | struct membank *bank = &mi->bank[i]; |
5e709827 RL |
88 | unsigned int pfn1, pfn2; |
89 | struct page *page, *end; | |
90 | ||
d2a38ef9 RK |
91 | pfn1 = bank_pfn_start(bank); |
92 | pfn2 = bank_pfn_end(bank); | |
5e709827 | 93 | |
204ecae4 RK |
94 | page = map + pfn1; |
95 | end = map + pfn2; | |
5e709827 RL |
96 | |
97 | do { | |
98 | total++; | |
99 | if (PageReserved(page)) | |
100 | reserved++; | |
101 | else if (PageSwapCache(page)) | |
102 | cached++; | |
103 | else if (PageSlab(page)) | |
104 | slab++; | |
105 | else if (!page_count(page)) | |
106 | free++; | |
107 | else | |
108 | shared += page_count(page) - 1; | |
109 | page++; | |
110 | } while (page < end); | |
111 | } | |
1da177e4 LT |
112 | } |
113 | ||
114 | printk("%d pages of RAM\n", total); | |
115 | printk("%d free pages\n", free); | |
116 | printk("%d reserved pages\n", reserved); | |
117 | printk("%d slab pages\n", slab); | |
118 | printk("%d pages shared\n", shared); | |
119 | printk("%d pages swap cached\n", cached); | |
120 | } | |
121 | ||
1da177e4 LT |
122 | /* |
123 | * FIXME: We really want to avoid allocating the bootmap bitmap | |
124 | * over the top of the initrd. Hopefully, this is located towards | |
125 | * the start of a bank, so if we allocate the bootmap bitmap at | |
126 | * the end, we won't clash. | |
127 | */ | |
128 | static unsigned int __init | |
129 | find_bootmap_pfn(int node, struct meminfo *mi, unsigned int bootmap_pages) | |
130 | { | |
d2a38ef9 | 131 | unsigned int start_pfn, i, bootmap_pfn; |
1da177e4 | 132 | |
37efe642 | 133 | start_pfn = PAGE_ALIGN(__pa(_end)) >> PAGE_SHIFT; |
1da177e4 LT |
134 | bootmap_pfn = 0; |
135 | ||
d2a38ef9 RK |
136 | for_each_nodebank(i, mi, node) { |
137 | struct membank *bank = &mi->bank[i]; | |
1da177e4 LT |
138 | unsigned int start, end; |
139 | ||
d2a38ef9 RK |
140 | start = bank_pfn_start(bank); |
141 | end = bank_pfn_end(bank); | |
1da177e4 LT |
142 | |
143 | if (end < start_pfn) | |
144 | continue; | |
145 | ||
146 | if (start < start_pfn) | |
147 | start = start_pfn; | |
148 | ||
149 | if (end <= start) | |
150 | continue; | |
151 | ||
152 | if (end - start >= bootmap_pages) { | |
153 | bootmap_pfn = start; | |
154 | break; | |
155 | } | |
156 | } | |
157 | ||
158 | if (bootmap_pfn == 0) | |
159 | BUG(); | |
160 | ||
161 | return bootmap_pfn; | |
162 | } | |
163 | ||
1da177e4 LT |
164 | static int __init check_initrd(struct meminfo *mi) |
165 | { | |
166 | int initrd_node = -2; | |
167 | #ifdef CONFIG_BLK_DEV_INITRD | |
168 | unsigned long end = phys_initrd_start + phys_initrd_size; | |
169 | ||
170 | /* | |
171 | * Make sure that the initrd is within a valid area of | |
172 | * memory. | |
173 | */ | |
174 | if (phys_initrd_size) { | |
175 | unsigned int i; | |
176 | ||
177 | initrd_node = -1; | |
178 | ||
179 | for (i = 0; i < mi->nr_banks; i++) { | |
d2a38ef9 RK |
180 | struct membank *bank = &mi->bank[i]; |
181 | if (bank_phys_start(bank) <= phys_initrd_start && | |
182 | end <= bank_phys_end(bank)) | |
183 | initrd_node = bank->node; | |
1da177e4 LT |
184 | } |
185 | } | |
186 | ||
187 | if (initrd_node == -1) { | |
b962a286 | 188 | printk(KERN_ERR "INITRD: 0x%08lx+0x%08lx extends beyond " |
1da177e4 | 189 | "physical memory - disabling initrd\n", |
b962a286 | 190 | phys_initrd_start, phys_initrd_size); |
1da177e4 LT |
191 | phys_initrd_start = phys_initrd_size = 0; |
192 | } | |
193 | #endif | |
194 | ||
195 | return initrd_node; | |
196 | } | |
197 | ||
456335e2 RK |
198 | static inline void map_memory_bank(struct membank *bank) |
199 | { | |
d111e8f9 | 200 | #ifdef CONFIG_MMU |
456335e2 RK |
201 | struct map_desc map; |
202 | ||
d2a38ef9 RK |
203 | map.pfn = bank_pfn_start(bank); |
204 | map.virtual = __phys_to_virt(bank_phys_start(bank)); | |
205 | map.length = bank_phys_size(bank); | |
456335e2 RK |
206 | map.type = MT_MEMORY; |
207 | ||
208 | create_mapping(&map); | |
d111e8f9 | 209 | #endif |
456335e2 RK |
210 | } |
211 | ||
b7a69ac3 | 212 | static unsigned long __init bootmem_init_node(int node, struct meminfo *mi) |
1da177e4 | 213 | { |
90072059 RK |
214 | unsigned long start_pfn, end_pfn, boot_pfn; |
215 | unsigned int boot_pages; | |
216 | pg_data_t *pgdat; | |
217 | int i; | |
1da177e4 | 218 | |
90072059 RK |
219 | start_pfn = -1UL; |
220 | end_pfn = 0; | |
1da177e4 | 221 | |
90072059 RK |
222 | /* |
223 | * Calculate the pfn range, and map the memory banks for this node. | |
224 | */ | |
225 | for_each_nodebank(i, mi, node) { | |
456335e2 | 226 | struct membank *bank = &mi->bank[i]; |
90072059 | 227 | unsigned long start, end; |
1da177e4 | 228 | |
d2a38ef9 RK |
229 | start = bank_pfn_start(bank); |
230 | end = bank_pfn_end(bank); | |
1da177e4 | 231 | |
90072059 RK |
232 | if (start_pfn > start) |
233 | start_pfn = start; | |
234 | if (end_pfn < end) | |
235 | end_pfn = end; | |
236 | ||
456335e2 | 237 | map_memory_bank(bank); |
90072059 | 238 | } |
1da177e4 LT |
239 | |
240 | /* | |
90072059 | 241 | * If there is no memory in this node, ignore it. |
1da177e4 | 242 | */ |
90072059 RK |
243 | if (end_pfn == 0) |
244 | return end_pfn; | |
1da177e4 | 245 | |
90072059 RK |
246 | /* |
247 | * Allocate the bootmem bitmap page. | |
248 | */ | |
249 | boot_pages = bootmem_bootmap_pages(end_pfn - start_pfn); | |
250 | boot_pfn = find_bootmap_pfn(node, mi, boot_pages); | |
1da177e4 | 251 | |
90072059 RK |
252 | /* |
253 | * Initialise the bootmem allocator for this node, handing the | |
254 | * memory banks over to bootmem. | |
255 | */ | |
256 | node_set_online(node); | |
257 | pgdat = NODE_DATA(node); | |
258 | init_bootmem_node(pgdat, boot_pfn, start_pfn, end_pfn); | |
1da177e4 | 259 | |
d2a38ef9 RK |
260 | for_each_nodebank(i, mi, node) { |
261 | struct membank *bank = &mi->bank[i]; | |
262 | free_bootmem_node(pgdat, bank_phys_start(bank), bank_phys_size(bank)); | |
b7a69ac3 | 263 | memory_present(node, bank_pfn_start(bank), bank_pfn_end(bank)); |
d2a38ef9 | 264 | } |
90072059 RK |
265 | |
266 | /* | |
267 | * Reserve the bootmem bitmap for this node. | |
268 | */ | |
269 | reserve_bootmem_node(pgdat, boot_pfn << PAGE_SHIFT, | |
72a7fe39 | 270 | boot_pages << PAGE_SHIFT, BOOTMEM_DEFAULT); |
1da177e4 | 271 | |
b7a69ac3 RK |
272 | return end_pfn; |
273 | } | |
b962a286 | 274 | |
b7a69ac3 RK |
275 | static void __init bootmem_reserve_initrd(int node) |
276 | { | |
1da177e4 | 277 | #ifdef CONFIG_BLK_DEV_INITRD |
b7a69ac3 RK |
278 | pg_data_t *pgdat = NODE_DATA(node); |
279 | int res; | |
280 | ||
281 | res = reserve_bootmem_node(pgdat, phys_initrd_start, | |
282 | phys_initrd_size, BOOTMEM_EXCLUSIVE); | |
283 | ||
284 | if (res == 0) { | |
285 | initrd_start = __phys_to_virt(phys_initrd_start); | |
286 | initrd_end = initrd_start + phys_initrd_size; | |
287 | } else { | |
288 | printk(KERN_ERR | |
289 | "INITRD: 0x%08lx+0x%08lx overlaps in-use " | |
290 | "memory region - disabling initrd\n", | |
291 | phys_initrd_start, phys_initrd_size); | |
1da177e4 LT |
292 | } |
293 | #endif | |
b7a69ac3 RK |
294 | } |
295 | ||
296 | static void __init bootmem_free_node(int node, struct meminfo *mi) | |
297 | { | |
298 | unsigned long zone_size[MAX_NR_ZONES], zhole_size[MAX_NR_ZONES]; | |
299 | unsigned long start_pfn, end_pfn; | |
300 | pg_data_t *pgdat = NODE_DATA(node); | |
301 | int i; | |
302 | ||
303 | start_pfn = pgdat->bdata->node_min_pfn; | |
304 | end_pfn = pgdat->bdata->node_low_pfn; | |
1da177e4 | 305 | |
90072059 RK |
306 | /* |
307 | * initialise the zones within this node. | |
308 | */ | |
309 | memset(zone_size, 0, sizeof(zone_size)); | |
310 | memset(zhole_size, 0, sizeof(zhole_size)); | |
311 | ||
312 | /* | |
313 | * The size of this node has already been determined. If we need | |
314 | * to do anything fancy with the allocation of this memory to the | |
315 | * zones, now is the time to do it. | |
316 | */ | |
317 | zone_size[0] = end_pfn - start_pfn; | |
318 | ||
319 | /* | |
320 | * For each bank in this node, calculate the size of the holes. | |
321 | * holes = node_size - sum(bank_sizes_in_node) | |
322 | */ | |
323 | zhole_size[0] = zone_size[0]; | |
324 | for_each_nodebank(i, mi, node) | |
d2a38ef9 | 325 | zhole_size[0] -= bank_pfn_size(&mi->bank[i]); |
90072059 RK |
326 | |
327 | /* | |
328 | * Adjust the sizes according to any special requirements for | |
329 | * this machine type. | |
330 | */ | |
331 | arch_adjust_zones(node, zone_size, zhole_size); | |
332 | ||
9109fb7b | 333 | free_area_init_node(node, zone_size, start_pfn, zhole_size); |
1da177e4 LT |
334 | } |
335 | ||
4b5f32ce | 336 | void __init bootmem_init(void) |
1da177e4 | 337 | { |
4b5f32ce | 338 | struct meminfo *mi = &meminfo; |
456335e2 | 339 | unsigned long memend_pfn = 0; |
eca73214 | 340 | int node, initrd_node; |
1da177e4 | 341 | |
1da177e4 | 342 | /* |
90072059 | 343 | * Locate which node contains the ramdisk image, if any. |
1da177e4 | 344 | */ |
90072059 | 345 | initrd_node = check_initrd(mi); |
1da177e4 | 346 | |
90072059 RK |
347 | /* |
348 | * Run through each node initialising the bootmem allocator. | |
349 | */ | |
350 | for_each_node(node) { | |
b7a69ac3 | 351 | unsigned long end_pfn = bootmem_init_node(node, mi); |
1da177e4 | 352 | |
b7a69ac3 RK |
353 | /* |
354 | * Reserve any special node zero regions. | |
355 | */ | |
356 | if (node == 0) | |
357 | reserve_node_zero(NODE_DATA(node)); | |
358 | ||
359 | /* | |
360 | * If the initrd is in this node, reserve its memory. | |
361 | */ | |
362 | if (node == initrd_node) | |
363 | bootmem_reserve_initrd(node); | |
1da177e4 LT |
364 | |
365 | /* | |
90072059 | 366 | * Remember the highest memory PFN. |
1da177e4 | 367 | */ |
90072059 RK |
368 | if (end_pfn > memend_pfn) |
369 | memend_pfn = end_pfn; | |
370 | } | |
1da177e4 | 371 | |
b7a69ac3 RK |
372 | /* |
373 | * sparse_init() needs the bootmem allocator up and running. | |
374 | */ | |
375 | sparse_init(); | |
376 | ||
377 | /* | |
378 | * Now free memory in each node - free_area_init_node needs | |
379 | * the sparse mem_map arrays initialized by sparse_init() | |
380 | * for memmap_init_zone(), otherwise all PFNs are invalid. | |
381 | */ | |
382 | for_each_node(node) | |
383 | bootmem_free_node(node, mi); | |
384 | ||
1522ac3e | 385 | high_memory = __va((memend_pfn << PAGE_SHIFT) - 1) + 1; |
1da177e4 | 386 | |
90072059 RK |
387 | /* |
388 | * This doesn't seem to be used by the Linux memory manager any | |
389 | * more, but is used by ll_rw_block. If we can get rid of it, we | |
390 | * also get rid of some of the stuff above as well. | |
391 | * | |
392 | * Note: max_low_pfn and max_pfn reflect the number of _pages_ in | |
393 | * the system, not the maximum PFN. | |
394 | */ | |
395 | max_pfn = max_low_pfn = memend_pfn - PHYS_PFN_OFFSET; | |
396 | } | |
1da177e4 | 397 | |
6db015e4 | 398 | static inline int free_area(unsigned long pfn, unsigned long end, char *s) |
1da177e4 | 399 | { |
6db015e4 | 400 | unsigned int pages = 0, size = (end - pfn) << (PAGE_SHIFT - 10); |
1da177e4 | 401 | |
6db015e4 NP |
402 | for (; pfn < end; pfn++) { |
403 | struct page *page = pfn_to_page(pfn); | |
1da177e4 | 404 | ClearPageReserved(page); |
7835e98b | 405 | init_page_count(page); |
6db015e4 NP |
406 | __free_page(page); |
407 | pages++; | |
1da177e4 LT |
408 | } |
409 | ||
410 | if (size && s) | |
411 | printk(KERN_INFO "Freeing %s memory: %dK\n", s, size); | |
6db015e4 NP |
412 | |
413 | return pages; | |
1da177e4 LT |
414 | } |
415 | ||
a013053d RK |
416 | static inline void |
417 | free_memmap(int node, unsigned long start_pfn, unsigned long end_pfn) | |
418 | { | |
419 | struct page *start_pg, *end_pg; | |
420 | unsigned long pg, pgend; | |
421 | ||
422 | /* | |
423 | * Convert start_pfn/end_pfn to a struct page pointer. | |
424 | */ | |
425 | start_pg = pfn_to_page(start_pfn); | |
426 | end_pg = pfn_to_page(end_pfn); | |
427 | ||
428 | /* | |
429 | * Convert to physical addresses, and | |
430 | * round start upwards and end downwards. | |
431 | */ | |
432 | pg = PAGE_ALIGN(__pa(start_pg)); | |
433 | pgend = __pa(end_pg) & PAGE_MASK; | |
434 | ||
435 | /* | |
436 | * If there are free pages between these, | |
437 | * free the section of the memmap array. | |
438 | */ | |
439 | if (pg < pgend) | |
440 | free_bootmem_node(NODE_DATA(node), pg, pgend - pg); | |
441 | } | |
442 | ||
443 | /* | |
444 | * The mem_map array can get very big. Free the unused area of the memory map. | |
445 | */ | |
446 | static void __init free_unused_memmap_node(int node, struct meminfo *mi) | |
447 | { | |
448 | unsigned long bank_start, prev_bank_end = 0; | |
449 | unsigned int i; | |
450 | ||
451 | /* | |
452 | * [FIXME] This relies on each bank being in address order. This | |
453 | * may not be the case, especially if the user has provided the | |
454 | * information on the command line. | |
455 | */ | |
90072059 | 456 | for_each_nodebank(i, mi, node) { |
d2a38ef9 RK |
457 | struct membank *bank = &mi->bank[i]; |
458 | ||
459 | bank_start = bank_pfn_start(bank); | |
a013053d RK |
460 | if (bank_start < prev_bank_end) { |
461 | printk(KERN_ERR "MEM: unordered memory banks. " | |
462 | "Not freeing memmap.\n"); | |
463 | break; | |
464 | } | |
465 | ||
466 | /* | |
467 | * If we had a previous bank, and there is a space | |
468 | * between the current bank and the previous, free it. | |
469 | */ | |
470 | if (prev_bank_end && prev_bank_end != bank_start) | |
471 | free_memmap(node, prev_bank_end, bank_start); | |
472 | ||
d2a38ef9 | 473 | prev_bank_end = bank_pfn_end(bank); |
a013053d RK |
474 | } |
475 | } | |
476 | ||
1da177e4 LT |
477 | /* |
478 | * mem_init() marks the free areas in the mem_map and tells us how much | |
479 | * memory is free. This is done after various parts of the system have | |
480 | * claimed their memory after the kernel image. | |
481 | */ | |
482 | void __init mem_init(void) | |
483 | { | |
6db015e4 | 484 | unsigned int codesize, datasize, initsize; |
1da177e4 LT |
485 | int i, node; |
486 | ||
1da177e4 LT |
487 | #ifndef CONFIG_DISCONTIGMEM |
488 | max_mapnr = virt_to_page(high_memory) - mem_map; | |
489 | #endif | |
490 | ||
1da177e4 LT |
491 | /* this will put all unused low memory onto the freelists */ |
492 | for_each_online_node(node) { | |
493 | pg_data_t *pgdat = NODE_DATA(node); | |
494 | ||
a013053d RK |
495 | free_unused_memmap_node(node, &meminfo); |
496 | ||
1da177e4 LT |
497 | if (pgdat->node_spanned_pages != 0) |
498 | totalram_pages += free_all_bootmem_node(pgdat); | |
499 | } | |
500 | ||
501 | #ifdef CONFIG_SA1111 | |
502 | /* now that our DMA memory is actually so designated, we can free it */ | |
6db015e4 NP |
503 | totalram_pages += free_area(PHYS_PFN_OFFSET, |
504 | __phys_to_pfn(__pa(swapper_pg_dir)), NULL); | |
1da177e4 LT |
505 | #endif |
506 | ||
507 | /* | |
508 | * Since our memory may not be contiguous, calculate the | |
509 | * real number of pages we have in this system | |
510 | */ | |
511 | printk(KERN_INFO "Memory:"); | |
1da177e4 LT |
512 | num_physpages = 0; |
513 | for (i = 0; i < meminfo.nr_banks; i++) { | |
d2a38ef9 RK |
514 | num_physpages += bank_pfn_size(&meminfo.bank[i]); |
515 | printk(" %ldMB", bank_phys_size(&meminfo.bank[i]) >> 20); | |
1da177e4 | 516 | } |
1da177e4 | 517 | printk(" = %luMB total\n", num_physpages >> (20 - PAGE_SHIFT)); |
6db015e4 | 518 | |
37efe642 RK |
519 | codesize = _etext - _text; |
520 | datasize = _end - _data; | |
521 | initsize = __init_end - __init_begin; | |
6db015e4 | 522 | |
1da177e4 LT |
523 | printk(KERN_NOTICE "Memory: %luKB available (%dK code, " |
524 | "%dK data, %dK init)\n", | |
525 | (unsigned long) nr_free_pages() << (PAGE_SHIFT-10), | |
6db015e4 | 526 | codesize >> 10, datasize >> 10, initsize >> 10); |
1da177e4 LT |
527 | |
528 | if (PAGE_SIZE >= 16384 && num_physpages <= 128) { | |
529 | extern int sysctl_overcommit_memory; | |
530 | /* | |
531 | * On a machine this small we won't get | |
532 | * anywhere without overcommit, so turn | |
533 | * it on by default. | |
534 | */ | |
535 | sysctl_overcommit_memory = OVERCOMMIT_ALWAYS; | |
536 | } | |
537 | } | |
538 | ||
539 | void free_initmem(void) | |
540 | { | |
6db015e4 | 541 | if (!machine_is_integrator() && !machine_is_cintegrator()) |
37efe642 RK |
542 | totalram_pages += free_area(__phys_to_pfn(__pa(__init_begin)), |
543 | __phys_to_pfn(__pa(__init_end)), | |
6db015e4 | 544 | "init"); |
1da177e4 LT |
545 | } |
546 | ||
547 | #ifdef CONFIG_BLK_DEV_INITRD | |
548 | ||
549 | static int keep_initrd; | |
550 | ||
551 | void free_initrd_mem(unsigned long start, unsigned long end) | |
552 | { | |
553 | if (!keep_initrd) | |
6db015e4 NP |
554 | totalram_pages += free_area(__phys_to_pfn(__pa(start)), |
555 | __phys_to_pfn(__pa(end)), | |
556 | "initrd"); | |
1da177e4 LT |
557 | } |
558 | ||
559 | static int __init keepinitrd_setup(char *__unused) | |
560 | { | |
561 | keep_initrd = 1; | |
562 | return 1; | |
563 | } | |
564 | ||
565 | __setup("keepinitrd", keepinitrd_setup); | |
566 | #endif |