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> | |
dc28094b | 16 | #include <linux/export.h> |
1da177e4 LT |
17 | #include <linux/nodemask.h> |
18 | #include <linux/initrd.h> | |
9eb8f674 | 19 | #include <linux/of_fdt.h> |
3835f6cb | 20 | #include <linux/highmem.h> |
5a0e3ad6 | 21 | #include <linux/gfp.h> |
2778f620 | 22 | #include <linux/memblock.h> |
c7909509 | 23 | #include <linux/dma-contiguous.h> |
158e8bfe | 24 | #include <linux/sizes.h> |
1da177e4 LT |
25 | |
26 | #include <asm/mach-types.h> | |
716a3dc2 | 27 | #include <asm/memblock.h> |
93c02ab4 | 28 | #include <asm/prom.h> |
37efe642 | 29 | #include <asm/sections.h> |
1da177e4 LT |
30 | #include <asm/setup.h> |
31 | #include <asm/tlb.h> | |
db9ef1af | 32 | #include <asm/fixmap.h> |
1da177e4 LT |
33 | |
34 | #include <asm/mach/arch.h> | |
35 | #include <asm/mach/map.h> | |
36 | ||
1b2e2b73 RK |
37 | #include "mm.h" |
38 | ||
de22cc6e | 39 | static phys_addr_t phys_initrd_start __initdata = 0; |
012d1f4a RK |
40 | static unsigned long phys_initrd_size __initdata = 0; |
41 | ||
2b0d8c25 | 42 | static int __init early_initrd(char *p) |
012d1f4a | 43 | { |
de22cc6e VA |
44 | phys_addr_t start; |
45 | unsigned long size; | |
2b0d8c25 | 46 | char *endp; |
012d1f4a | 47 | |
2b0d8c25 JK |
48 | start = memparse(p, &endp); |
49 | if (*endp == ',') { | |
50 | size = memparse(endp + 1, NULL); | |
012d1f4a RK |
51 | |
52 | phys_initrd_start = start; | |
53 | phys_initrd_size = size; | |
54 | } | |
2b0d8c25 | 55 | return 0; |
012d1f4a | 56 | } |
2b0d8c25 | 57 | early_param("initrd", early_initrd); |
012d1f4a RK |
58 | |
59 | static int __init parse_tag_initrd(const struct tag *tag) | |
60 | { | |
61 | printk(KERN_WARNING "ATAG_INITRD is deprecated; " | |
62 | "please update your bootloader.\n"); | |
63 | phys_initrd_start = __virt_to_phys(tag->u.initrd.start); | |
64 | phys_initrd_size = tag->u.initrd.size; | |
65 | return 0; | |
66 | } | |
67 | ||
68 | __tagtable(ATAG_INITRD, parse_tag_initrd); | |
69 | ||
70 | static int __init parse_tag_initrd2(const struct tag *tag) | |
71 | { | |
72 | phys_initrd_start = tag->u.initrd.start; | |
73 | phys_initrd_size = tag->u.initrd.size; | |
74 | return 0; | |
75 | } | |
76 | ||
77 | __tagtable(ATAG_INITRD2, parse_tag_initrd2); | |
1da177e4 | 78 | |
9eb8f674 | 79 | #ifdef CONFIG_OF_FLATTREE |
374d5c99 | 80 | void __init early_init_dt_setup_initrd_arch(u64 start, u64 end) |
9eb8f674 GL |
81 | { |
82 | phys_initrd_start = start; | |
83 | phys_initrd_size = end - start; | |
84 | } | |
85 | #endif /* CONFIG_OF_FLATTREE */ | |
86 | ||
1da177e4 | 87 | /* |
4b5f32ce NP |
88 | * This keeps memory configuration data used by a couple memory |
89 | * initialization functions, as well as show_mem() for the skipping | |
90 | * of holes in the memory map. It is populated by arm_add_memory(). | |
1da177e4 | 91 | */ |
4b5f32ce | 92 | struct meminfo meminfo; |
5e709827 | 93 | |
b2b755b5 | 94 | void show_mem(unsigned int filter) |
1da177e4 LT |
95 | { |
96 | int free = 0, total = 0, reserved = 0; | |
be370302 | 97 | int shared = 0, cached = 0, slab = 0, i; |
5e709827 | 98 | struct meminfo * mi = &meminfo; |
1da177e4 LT |
99 | |
100 | printk("Mem-info:\n"); | |
7bf02ea2 | 101 | show_free_areas(filter); |
be370302 | 102 | |
4b59e6c4 DR |
103 | if (filter & SHOW_MEM_FILTER_PAGE_COUNT) |
104 | return; | |
105 | ||
be370302 RK |
106 | for_each_bank (i, mi) { |
107 | struct membank *bank = &mi->bank[i]; | |
108 | unsigned int pfn1, pfn2; | |
109 | struct page *page, *end; | |
110 | ||
111 | pfn1 = bank_pfn_start(bank); | |
112 | pfn2 = bank_pfn_end(bank); | |
113 | ||
114 | page = pfn_to_page(pfn1); | |
115 | end = pfn_to_page(pfn2 - 1) + 1; | |
116 | ||
117 | do { | |
118 | total++; | |
119 | if (PageReserved(page)) | |
120 | reserved++; | |
121 | else if (PageSwapCache(page)) | |
122 | cached++; | |
123 | else if (PageSlab(page)) | |
124 | slab++; | |
125 | else if (!page_count(page)) | |
126 | free++; | |
127 | else | |
128 | shared += page_count(page) - 1; | |
129 | page++; | |
130 | } while (page < end); | |
1da177e4 LT |
131 | } |
132 | ||
133 | printk("%d pages of RAM\n", total); | |
134 | printk("%d free pages\n", free); | |
135 | printk("%d reserved pages\n", reserved); | |
136 | printk("%d slab pages\n", slab); | |
137 | printk("%d pages shared\n", shared); | |
138 | printk("%d pages swap cached\n", cached); | |
139 | } | |
140 | ||
f25b4b4c | 141 | static void __init find_limits(unsigned long *min, unsigned long *max_low, |
27a3f0e9 | 142 | unsigned long *max_high) |
dde5828f | 143 | { |
f25b4b4c | 144 | struct meminfo *mi = &meminfo; |
dde5828f RK |
145 | int i; |
146 | ||
27a3f0e9 NP |
147 | /* This assumes the meminfo array is properly sorted */ |
148 | *min = bank_pfn_start(&mi->bank[0]); | |
149 | for_each_bank (i, mi) | |
150 | if (mi->bank[i].highmem) | |
151 | break; | |
152 | *max_low = bank_pfn_end(&mi->bank[i - 1]); | |
153 | *max_high = bank_pfn_end(&mi->bank[mi->nr_banks - 1]); | |
dde5828f RK |
154 | } |
155 | ||
a801d276 RK |
156 | static void __init arm_bootmem_init(unsigned long start_pfn, |
157 | unsigned long end_pfn) | |
1da177e4 | 158 | { |
719c1514 | 159 | struct memblock_region *reg; |
90072059 | 160 | unsigned int boot_pages; |
2778f620 | 161 | phys_addr_t bitmap; |
90072059 | 162 | pg_data_t *pgdat; |
1da177e4 | 163 | |
90072059 | 164 | /* |
2778f620 RK |
165 | * Allocate the bootmem bitmap page. This must be in a region |
166 | * of memory which has already been mapped. | |
90072059 RK |
167 | */ |
168 | boot_pages = bootmem_bootmap_pages(end_pfn - start_pfn); | |
2778f620 RK |
169 | bitmap = memblock_alloc_base(boot_pages << PAGE_SHIFT, L1_CACHE_BYTES, |
170 | __pfn_to_phys(end_pfn)); | |
1da177e4 | 171 | |
90072059 | 172 | /* |
be370302 | 173 | * Initialise the bootmem allocator, handing the |
90072059 RK |
174 | * memory banks over to bootmem. |
175 | */ | |
be370302 RK |
176 | node_set_online(0); |
177 | pgdat = NODE_DATA(0); | |
2778f620 | 178 | init_bootmem_node(pgdat, __phys_to_pfn(bitmap), start_pfn, end_pfn); |
1da177e4 | 179 | |
a801d276 RK |
180 | /* Free the lowmem regions from memblock into bootmem. */ |
181 | for_each_memblock(memory, reg) { | |
182 | unsigned long start = memblock_region_memory_base_pfn(reg); | |
183 | unsigned long end = memblock_region_memory_end_pfn(reg); | |
184 | ||
185 | if (end >= end_pfn) | |
186 | end = end_pfn; | |
187 | if (start >= end) | |
188 | break; | |
189 | ||
190 | free_bootmem(__pfn_to_phys(start), (end - start) << PAGE_SHIFT); | |
d2a38ef9 | 191 | } |
90072059 | 192 | |
a801d276 | 193 | /* Reserve the lowmem memblock reserved regions in bootmem. */ |
719c1514 | 194 | for_each_memblock(reserved, reg) { |
a801d276 RK |
195 | unsigned long start = memblock_region_reserved_base_pfn(reg); |
196 | unsigned long end = memblock_region_reserved_end_pfn(reg); | |
197 | ||
198 | if (end >= end_pfn) | |
199 | end = end_pfn; | |
200 | if (start >= end) | |
201 | break; | |
202 | ||
203 | reserve_bootmem(__pfn_to_phys(start), | |
204 | (end - start) << PAGE_SHIFT, BOOTMEM_DEFAULT); | |
1da177e4 | 205 | } |
b7a69ac3 RK |
206 | } |
207 | ||
be20902b | 208 | #ifdef CONFIG_ZONE_DMA |
65032018 | 209 | |
65032018 | 210 | unsigned long arm_dma_zone_size __read_mostly; |
65032018 NP |
211 | EXPORT_SYMBOL(arm_dma_zone_size); |
212 | ||
022ae537 RK |
213 | /* |
214 | * The DMA mask corresponding to the maximum bus address allocatable | |
215 | * using GFP_DMA. The default here places no restriction on DMA | |
216 | * allocations. This must be the smallest DMA mask in the system, | |
217 | * so a successful GFP_DMA allocation will always satisfy this. | |
218 | */ | |
4986e5c7 | 219 | phys_addr_t arm_dma_limit; |
022ae537 | 220 | |
be20902b RK |
221 | static void __init arm_adjust_dma_zone(unsigned long *size, unsigned long *hole, |
222 | unsigned long dma_size) | |
223 | { | |
224 | if (size[0] <= dma_size) | |
225 | return; | |
226 | ||
227 | size[ZONE_NORMAL] = size[0] - dma_size; | |
228 | size[ZONE_DMA] = dma_size; | |
229 | hole[ZONE_NORMAL] = hole[0]; | |
230 | hole[ZONE_DMA] = 0; | |
231 | } | |
232 | #endif | |
233 | ||
c7909509 MS |
234 | void __init setup_dma_zone(struct machine_desc *mdesc) |
235 | { | |
236 | #ifdef CONFIG_ZONE_DMA | |
237 | if (mdesc->dma_zone_size) { | |
238 | arm_dma_zone_size = mdesc->dma_zone_size; | |
239 | arm_dma_limit = PHYS_OFFSET + arm_dma_zone_size - 1; | |
240 | } else | |
241 | arm_dma_limit = 0xffffffff; | |
242 | #endif | |
243 | } | |
244 | ||
a2c54d2a RK |
245 | static void __init arm_bootmem_free(unsigned long min, unsigned long max_low, |
246 | unsigned long max_high) | |
b7a69ac3 RK |
247 | { |
248 | unsigned long zone_size[MAX_NR_ZONES], zhole_size[MAX_NR_ZONES]; | |
a2c54d2a | 249 | struct memblock_region *reg; |
b7a69ac3 | 250 | |
90072059 | 251 | /* |
be370302 | 252 | * initialise the zones. |
90072059 RK |
253 | */ |
254 | memset(zone_size, 0, sizeof(zone_size)); | |
90072059 RK |
255 | |
256 | /* | |
be370302 RK |
257 | * The memory size has already been determined. If we need |
258 | * to do anything fancy with the allocation of this memory | |
259 | * to the zones, now is the time to do it. | |
90072059 | 260 | */ |
dde5828f RK |
261 | zone_size[0] = max_low - min; |
262 | #ifdef CONFIG_HIGHMEM | |
263 | zone_size[ZONE_HIGHMEM] = max_high - max_low; | |
264 | #endif | |
90072059 RK |
265 | |
266 | /* | |
be370302 RK |
267 | * Calculate the size of the holes. |
268 | * holes = node_size - sum(bank_sizes) | |
90072059 | 269 | */ |
dde5828f | 270 | memcpy(zhole_size, zone_size, sizeof(zhole_size)); |
a2c54d2a RK |
271 | for_each_memblock(memory, reg) { |
272 | unsigned long start = memblock_region_memory_base_pfn(reg); | |
273 | unsigned long end = memblock_region_memory_end_pfn(reg); | |
274 | ||
275 | if (start < max_low) { | |
276 | unsigned long low_end = min(end, max_low); | |
277 | zhole_size[0] -= low_end - start; | |
278 | } | |
dde5828f | 279 | #ifdef CONFIG_HIGHMEM |
a2c54d2a RK |
280 | if (end > max_low) { |
281 | unsigned long high_start = max(start, max_low); | |
282 | zhole_size[ZONE_HIGHMEM] -= end - high_start; | |
283 | } | |
dde5828f | 284 | #endif |
dde5828f | 285 | } |
90072059 | 286 | |
65032018 | 287 | #ifdef CONFIG_ZONE_DMA |
90072059 RK |
288 | /* |
289 | * Adjust the sizes according to any special requirements for | |
290 | * this machine type. | |
291 | */ | |
c7909509 | 292 | if (arm_dma_zone_size) |
65032018 NP |
293 | arm_adjust_dma_zone(zone_size, zhole_size, |
294 | arm_dma_zone_size >> PAGE_SHIFT); | |
be20902b | 295 | #endif |
90072059 | 296 | |
be370302 | 297 | free_area_init_node(0, zone_size, min, zhole_size); |
1da177e4 LT |
298 | } |
299 | ||
7b7bf499 | 300 | #ifdef CONFIG_HAVE_ARCH_PFN_VALID |
b7cfda9f RK |
301 | int pfn_valid(unsigned long pfn) |
302 | { | |
fb492c91 | 303 | return memblock_is_memory(__pfn_to_phys(pfn)); |
b7cfda9f RK |
304 | } |
305 | EXPORT_SYMBOL(pfn_valid); | |
7b7bf499 | 306 | #endif |
657e12fd | 307 | |
7b7bf499 | 308 | #ifndef CONFIG_SPARSEMEM |
14904927 | 309 | static void __init arm_memory_present(void) |
657e12fd RK |
310 | { |
311 | } | |
312 | #else | |
14904927 | 313 | static void __init arm_memory_present(void) |
657e12fd | 314 | { |
719c1514 | 315 | struct memblock_region *reg; |
719c1514 | 316 | |
7c996361 | 317 | for_each_memblock(memory, reg) |
c7fc2de0 YL |
318 | memory_present(0, memblock_region_memory_base_pfn(reg), |
319 | memblock_region_memory_end_pfn(reg)); | |
657e12fd | 320 | } |
b7cfda9f RK |
321 | #endif |
322 | ||
716a3dc2 RK |
323 | static bool arm_memblock_steal_permitted = true; |
324 | ||
bc2827d0 | 325 | phys_addr_t __init arm_memblock_steal(phys_addr_t size, phys_addr_t align) |
716a3dc2 RK |
326 | { |
327 | phys_addr_t phys; | |
328 | ||
329 | BUG_ON(!arm_memblock_steal_permitted); | |
330 | ||
7ac68a4c | 331 | phys = memblock_alloc_base(size, align, MEMBLOCK_ALLOC_ANYWHERE); |
716a3dc2 RK |
332 | memblock_free(phys, size); |
333 | memblock_remove(phys, size); | |
334 | ||
335 | return phys; | |
336 | } | |
337 | ||
8d717a52 | 338 | void __init arm_memblock_init(struct meminfo *mi, struct machine_desc *mdesc) |
2778f620 RK |
339 | { |
340 | int i; | |
341 | ||
2778f620 RK |
342 | for (i = 0; i < mi->nr_banks; i++) |
343 | memblock_add(mi->bank[i].start, mi->bank[i].size); | |
344 | ||
345 | /* Register the kernel text, kernel data and initrd with memblock. */ | |
346 | #ifdef CONFIG_XIP_KERNEL | |
842eab40 | 347 | memblock_reserve(__pa(_sdata), _end - _sdata); |
2778f620 RK |
348 | #else |
349 | memblock_reserve(__pa(_stext), _end - _stext); | |
350 | #endif | |
351 | #ifdef CONFIG_BLK_DEV_INITRD | |
8f4b8c76 RK |
352 | if (phys_initrd_size && |
353 | !memblock_is_region_memory(phys_initrd_start, phys_initrd_size)) { | |
de22cc6e VA |
354 | pr_err("INITRD: 0x%08llx+0x%08lx is not a memory region - disabling initrd\n", |
355 | (u64)phys_initrd_start, phys_initrd_size); | |
8f4b8c76 RK |
356 | phys_initrd_start = phys_initrd_size = 0; |
357 | } | |
b0a2679d RK |
358 | if (phys_initrd_size && |
359 | memblock_is_region_reserved(phys_initrd_start, phys_initrd_size)) { | |
de22cc6e VA |
360 | pr_err("INITRD: 0x%08llx+0x%08lx overlaps in-use memory region - disabling initrd\n", |
361 | (u64)phys_initrd_start, phys_initrd_size); | |
b0a2679d RK |
362 | phys_initrd_start = phys_initrd_size = 0; |
363 | } | |
2778f620 RK |
364 | if (phys_initrd_size) { |
365 | memblock_reserve(phys_initrd_start, phys_initrd_size); | |
366 | ||
367 | /* Now convert initrd to virtual addresses */ | |
368 | initrd_start = __phys_to_virt(phys_initrd_start); | |
369 | initrd_end = initrd_start + phys_initrd_size; | |
370 | } | |
371 | #endif | |
372 | ||
373 | arm_mm_memblock_reserve(); | |
93c02ab4 | 374 | arm_dt_memblock_reserve(); |
2778f620 | 375 | |
8d717a52 RK |
376 | /* reserve any platform specific memblock areas */ |
377 | if (mdesc->reserve) | |
378 | mdesc->reserve(); | |
379 | ||
c7909509 MS |
380 | /* |
381 | * reserve memory for DMA contigouos allocations, | |
382 | * must come from DMA area inside low memory | |
383 | */ | |
384 | dma_contiguous_reserve(min(arm_dma_limit, arm_lowmem_limit)); | |
385 | ||
716a3dc2 | 386 | arm_memblock_steal_permitted = false; |
1aadc056 | 387 | memblock_allow_resize(); |
2778f620 RK |
388 | memblock_dump_all(); |
389 | } | |
390 | ||
8d717a52 | 391 | void __init bootmem_init(void) |
1da177e4 | 392 | { |
dde5828f | 393 | unsigned long min, max_low, max_high; |
1da177e4 | 394 | |
dde5828f RK |
395 | max_low = max_high = 0; |
396 | ||
f25b4b4c | 397 | find_limits(&min, &max_low, &max_high); |
dde5828f | 398 | |
a801d276 | 399 | arm_bootmem_init(min, max_low); |
dde5828f | 400 | |
be370302 RK |
401 | /* |
402 | * Sparsemem tries to allocate bootmem in memory_present(), | |
403 | * so must be done after the fixed reservations | |
404 | */ | |
eda2e5dc | 405 | arm_memory_present(); |
1da177e4 | 406 | |
b7a69ac3 RK |
407 | /* |
408 | * sparse_init() needs the bootmem allocator up and running. | |
409 | */ | |
410 | sparse_init(); | |
411 | ||
412 | /* | |
be370302 | 413 | * Now free the memory - free_area_init_node needs |
b7a69ac3 RK |
414 | * the sparse mem_map arrays initialized by sparse_init() |
415 | * for memmap_init_zone(), otherwise all PFNs are invalid. | |
416 | */ | |
a2c54d2a | 417 | arm_bootmem_free(min, max_low, max_high); |
b7a69ac3 | 418 | |
90072059 RK |
419 | /* |
420 | * This doesn't seem to be used by the Linux memory manager any | |
421 | * more, but is used by ll_rw_block. If we can get rid of it, we | |
422 | * also get rid of some of the stuff above as well. | |
423 | * | |
424 | * Note: max_low_pfn and max_pfn reflect the number of _pages_ in | |
425 | * the system, not the maximum PFN. | |
426 | */ | |
dde5828f RK |
427 | max_low_pfn = max_low - PHYS_PFN_OFFSET; |
428 | max_pfn = max_high - PHYS_PFN_OFFSET; | |
90072059 | 429 | } |
1da177e4 | 430 | |
54d52573 SB |
431 | /* |
432 | * Poison init memory with an undefined instruction (ARM) or a branch to an | |
433 | * undefined instruction (Thumb). | |
434 | */ | |
435 | static inline void poison_init_mem(void *s, size_t count) | |
436 | { | |
437 | u32 *p = (u32 *)s; | |
bf912d99 | 438 | for (; count != 0; count -= 4) |
54d52573 SB |
439 | *p++ = 0xe7fddef0; |
440 | } | |
441 | ||
a013053d | 442 | static inline void |
be370302 | 443 | free_memmap(unsigned long start_pfn, unsigned long end_pfn) |
a013053d RK |
444 | { |
445 | struct page *start_pg, *end_pg; | |
56bc6286 | 446 | phys_addr_t pg, pgend; |
a013053d RK |
447 | |
448 | /* | |
449 | * Convert start_pfn/end_pfn to a struct page pointer. | |
450 | */ | |
3257f43d | 451 | start_pg = pfn_to_page(start_pfn - 1) + 1; |
9af386c8 | 452 | end_pg = pfn_to_page(end_pfn - 1) + 1; |
a013053d RK |
453 | |
454 | /* | |
455 | * Convert to physical addresses, and | |
456 | * round start upwards and end downwards. | |
457 | */ | |
56bc6286 VA |
458 | pg = PAGE_ALIGN(__pa(start_pg)); |
459 | pgend = __pa(end_pg) & PAGE_MASK; | |
a013053d RK |
460 | |
461 | /* | |
462 | * If there are free pages between these, | |
463 | * free the section of the memmap array. | |
464 | */ | |
465 | if (pg < pgend) | |
be370302 | 466 | free_bootmem(pg, pgend - pg); |
a013053d RK |
467 | } |
468 | ||
469 | /* | |
470 | * The mem_map array can get very big. Free the unused area of the memory map. | |
471 | */ | |
be370302 | 472 | static void __init free_unused_memmap(struct meminfo *mi) |
a013053d RK |
473 | { |
474 | unsigned long bank_start, prev_bank_end = 0; | |
475 | unsigned int i; | |
476 | ||
477 | /* | |
3260e529 MB |
478 | * This relies on each bank being in address order. |
479 | * The banks are sorted previously in bootmem_init(). | |
a013053d | 480 | */ |
be370302 | 481 | for_each_bank(i, mi) { |
d2a38ef9 RK |
482 | struct membank *bank = &mi->bank[i]; |
483 | ||
484 | bank_start = bank_pfn_start(bank); | |
a013053d | 485 | |
9af386c8 WD |
486 | #ifdef CONFIG_SPARSEMEM |
487 | /* | |
488 | * Take care not to free memmap entries that don't exist | |
489 | * due to SPARSEMEM sections which aren't present. | |
490 | */ | |
491 | bank_start = min(bank_start, | |
492 | ALIGN(prev_bank_end, PAGES_PER_SECTION)); | |
002ea9ee LW |
493 | #else |
494 | /* | |
495 | * Align down here since the VM subsystem insists that the | |
496 | * memmap entries are valid from the bank start aligned to | |
497 | * MAX_ORDER_NR_PAGES. | |
498 | */ | |
499 | bank_start = round_down(bank_start, MAX_ORDER_NR_PAGES); | |
9af386c8 | 500 | #endif |
a013053d RK |
501 | /* |
502 | * If we had a previous bank, and there is a space | |
503 | * between the current bank and the previous, free it. | |
504 | */ | |
3260e529 | 505 | if (prev_bank_end && prev_bank_end < bank_start) |
be370302 | 506 | free_memmap(prev_bank_end, bank_start); |
a013053d | 507 | |
3260e529 MB |
508 | /* |
509 | * Align up here since the VM subsystem insists that the | |
510 | * memmap entries are valid from the bank end aligned to | |
511 | * MAX_ORDER_NR_PAGES. | |
512 | */ | |
513 | prev_bank_end = ALIGN(bank_pfn_end(bank), MAX_ORDER_NR_PAGES); | |
a013053d | 514 | } |
9af386c8 WD |
515 | |
516 | #ifdef CONFIG_SPARSEMEM | |
517 | if (!IS_ALIGNED(prev_bank_end, PAGES_PER_SECTION)) | |
518 | free_memmap(prev_bank_end, | |
519 | ALIGN(prev_bank_end, PAGES_PER_SECTION)); | |
520 | #endif | |
a013053d RK |
521 | } |
522 | ||
83db0384 JL |
523 | #ifdef CONFIG_HIGHMEM |
524 | static inline void free_area_high(unsigned long pfn, unsigned long end) | |
525 | { | |
dd6911ef JL |
526 | for (; pfn < end; pfn++) |
527 | free_highmem_page(pfn_to_page(pfn)); | |
83db0384 JL |
528 | } |
529 | #endif | |
530 | ||
d0e775af RK |
531 | static void __init free_highpages(void) |
532 | { | |
533 | #ifdef CONFIG_HIGHMEM | |
df4f14c7 RK |
534 | unsigned long max_low = max_low_pfn + PHYS_PFN_OFFSET; |
535 | struct memblock_region *mem, *res; | |
d0e775af RK |
536 | |
537 | /* set highmem page free */ | |
df4f14c7 RK |
538 | for_each_memblock(memory, mem) { |
539 | unsigned long start = memblock_region_memory_base_pfn(mem); | |
540 | unsigned long end = memblock_region_memory_end_pfn(mem); | |
541 | ||
542 | /* Ignore complete lowmem entries */ | |
543 | if (end <= max_low) | |
544 | continue; | |
545 | ||
546 | /* Truncate partial highmem entries */ | |
547 | if (start < max_low) | |
548 | start = max_low; | |
549 | ||
550 | /* Find and exclude any reserved regions */ | |
551 | for_each_memblock(reserved, res) { | |
552 | unsigned long res_start, res_end; | |
553 | ||
554 | res_start = memblock_region_reserved_base_pfn(res); | |
555 | res_end = memblock_region_reserved_end_pfn(res); | |
556 | ||
557 | if (res_end < start) | |
558 | continue; | |
559 | if (res_start < start) | |
560 | res_start = start; | |
561 | if (res_start > end) | |
562 | res_start = end; | |
563 | if (res_end > end) | |
564 | res_end = end; | |
565 | if (res_start != start) | |
83db0384 | 566 | free_area_high(start, res_start); |
df4f14c7 RK |
567 | start = res_end; |
568 | if (start == end) | |
569 | break; | |
570 | } | |
571 | ||
572 | /* And now free anything which remains */ | |
573 | if (start < end) | |
83db0384 | 574 | free_area_high(start, end); |
d0e775af | 575 | } |
d0e775af RK |
576 | #endif |
577 | } | |
578 | ||
1da177e4 LT |
579 | /* |
580 | * mem_init() marks the free areas in the mem_map and tells us how much | |
581 | * memory is free. This is done after various parts of the system have | |
582 | * claimed their memory after the kernel image. | |
583 | */ | |
584 | void __init mem_init(void) | |
585 | { | |
1dbd30e9 LW |
586 | #ifdef CONFIG_HAVE_TCM |
587 | /* These pointers are filled in on TCM detection */ | |
588 | extern u32 dtcm_end; | |
589 | extern u32 itcm_end; | |
590 | #endif | |
1da177e4 | 591 | |
3835f6cb | 592 | max_mapnr = pfn_to_page(max_pfn + PHYS_PFN_OFFSET) - mem_map; |
1da177e4 | 593 | |
1da177e4 | 594 | /* this will put all unused low memory onto the freelists */ |
be370302 | 595 | free_unused_memmap(&meminfo); |
0c988534 | 596 | free_all_bootmem(); |
1da177e4 LT |
597 | |
598 | #ifdef CONFIG_SA1111 | |
599 | /* now that our DMA memory is actually so designated, we can free it */ | |
bfd65dd9 | 600 | free_reserved_area(__va(PHYS_OFFSET), swapper_pg_dir, -1, NULL); |
1da177e4 LT |
601 | #endif |
602 | ||
d0e775af | 603 | free_highpages(); |
3835f6cb | 604 | |
2450c973 | 605 | mem_init_print_info(NULL); |
1da177e4 | 606 | |
db9ef1af FB |
607 | #define MLK(b, t) b, t, ((t) - (b)) >> 10 |
608 | #define MLM(b, t) b, t, ((t) - (b)) >> 20 | |
609 | #define MLK_ROUNDUP(b, t) b, t, DIV_ROUND_UP(((t) - (b)), SZ_1K) | |
610 | ||
611 | printk(KERN_NOTICE "Virtual kernel memory layout:\n" | |
612 | " vector : 0x%08lx - 0x%08lx (%4ld kB)\n" | |
07d2a5c7 | 613 | #ifdef CONFIG_HAVE_TCM |
07d2a5c7 | 614 | " DTCM : 0x%08lx - 0x%08lx (%4ld kB)\n" |
07d2a5c7 | 615 | " ITCM : 0x%08lx - 0x%08lx (%4ld kB)\n" |
07d2a5c7 | 616 | #endif |
db9ef1af FB |
617 | " fixmap : 0x%08lx - 0x%08lx (%4ld kB)\n" |
618 | " vmalloc : 0x%08lx - 0x%08lx (%4ld MB)\n" | |
619 | " lowmem : 0x%08lx - 0x%08lx (%4ld MB)\n" | |
620 | #ifdef CONFIG_HIGHMEM | |
621 | " pkmap : 0x%08lx - 0x%08lx (%4ld MB)\n" | |
622 | #endif | |
d9277d51 | 623 | #ifdef CONFIG_MODULES |
db9ef1af | 624 | " modules : 0x%08lx - 0x%08lx (%4ld MB)\n" |
d9277d51 | 625 | #endif |
db9ef1af | 626 | " .text : 0x%p" " - 0x%p" " (%4d kB)\n" |
3835d69a | 627 | " .init : 0x%p" " - 0x%p" " (%4d kB)\n" |
45f6d7e0 RV |
628 | " .data : 0x%p" " - 0x%p" " (%4d kB)\n" |
629 | " .bss : 0x%p" " - 0x%p" " (%4d kB)\n", | |
db9ef1af FB |
630 | |
631 | MLK(UL(CONFIG_VECTORS_BASE), UL(CONFIG_VECTORS_BASE) + | |
632 | (PAGE_SIZE)), | |
07d2a5c7 | 633 | #ifdef CONFIG_HAVE_TCM |
1dbd30e9 LW |
634 | MLK(DTCM_OFFSET, (unsigned long) dtcm_end), |
635 | MLK(ITCM_OFFSET, (unsigned long) itcm_end), | |
07d2a5c7 | 636 | #endif |
db9ef1af | 637 | MLK(FIXADDR_START, FIXADDR_TOP), |
c931b4f6 | 638 | MLM(VMALLOC_START, VMALLOC_END), |
db9ef1af FB |
639 | MLM(PAGE_OFFSET, (unsigned long)high_memory), |
640 | #ifdef CONFIG_HIGHMEM | |
641 | MLM(PKMAP_BASE, (PKMAP_BASE) + (LAST_PKMAP) * | |
642 | (PAGE_SIZE)), | |
643 | #endif | |
d9277d51 | 644 | #ifdef CONFIG_MODULES |
db9ef1af | 645 | MLM(MODULES_VADDR, MODULES_END), |
d9277d51 | 646 | #endif |
db9ef1af | 647 | |
db9ef1af | 648 | MLK_ROUNDUP(_text, _etext), |
3835d69a | 649 | MLK_ROUNDUP(__init_begin, __init_end), |
45f6d7e0 RV |
650 | MLK_ROUNDUP(_sdata, _edata), |
651 | MLK_ROUNDUP(__bss_start, __bss_stop)); | |
db9ef1af FB |
652 | |
653 | #undef MLK | |
654 | #undef MLM | |
655 | #undef MLK_ROUNDUP | |
656 | ||
a1839272 FB |
657 | /* |
658 | * Check boundaries twice: Some fundamental inconsistencies can | |
659 | * be detected at build time already. | |
660 | */ | |
661 | #ifdef CONFIG_MMU | |
a1839272 FB |
662 | BUILD_BUG_ON(TASK_SIZE > MODULES_VADDR); |
663 | BUG_ON(TASK_SIZE > MODULES_VADDR); | |
664 | #endif | |
665 | ||
666 | #ifdef CONFIG_HIGHMEM | |
667 | BUILD_BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE > PAGE_OFFSET); | |
668 | BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE > PAGE_OFFSET); | |
669 | #endif | |
670 | ||
2450c973 | 671 | if (PAGE_SIZE >= 16384 && get_num_physpages() <= 128) { |
1da177e4 LT |
672 | extern int sysctl_overcommit_memory; |
673 | /* | |
674 | * On a machine this small we won't get | |
675 | * anywhere without overcommit, so turn | |
676 | * it on by default. | |
677 | */ | |
678 | sysctl_overcommit_memory = OVERCOMMIT_ALWAYS; | |
679 | } | |
680 | } | |
681 | ||
682 | void free_initmem(void) | |
683 | { | |
bc581770 | 684 | #ifdef CONFIG_HAVE_TCM |
ea208f64 | 685 | extern char __tcm_start, __tcm_end; |
bc581770 | 686 | |
54d52573 | 687 | poison_init_mem(&__tcm_start, &__tcm_end - &__tcm_start); |
dbe67df4 | 688 | free_reserved_area(&__tcm_start, &__tcm_end, -1, "TCM link"); |
bc581770 LW |
689 | #endif |
690 | ||
54d52573 | 691 | poison_init_mem(__init_begin, __init_end - __init_begin); |
6db015e4 | 692 | if (!machine_is_integrator() && !machine_is_cintegrator()) |
dbe67df4 | 693 | free_initmem_default(-1); |
1da177e4 LT |
694 | } |
695 | ||
696 | #ifdef CONFIG_BLK_DEV_INITRD | |
697 | ||
698 | static int keep_initrd; | |
699 | ||
700 | void free_initrd_mem(unsigned long start, unsigned long end) | |
701 | { | |
54d52573 SB |
702 | if (!keep_initrd) { |
703 | poison_init_mem((void *)start, PAGE_ALIGN(end) - start); | |
dbe67df4 | 704 | free_reserved_area((void *)start, (void *)end, -1, "initrd"); |
54d52573 | 705 | } |
1da177e4 LT |
706 | } |
707 | ||
708 | static int __init keepinitrd_setup(char *__unused) | |
709 | { | |
710 | keep_initrd = 1; | |
711 | return 1; | |
712 | } | |
713 | ||
714 | __setup("keepinitrd", keepinitrd_setup); | |
715 | #endif |