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 | ||
012d1f4a RK |
39 | static unsigned long phys_initrd_start __initdata = 0; |
40 | static unsigned long phys_initrd_size __initdata = 0; | |
41 | ||
2b0d8c25 | 42 | static int __init early_initrd(char *p) |
012d1f4a RK |
43 | { |
44 | unsigned long start, size; | |
2b0d8c25 | 45 | char *endp; |
012d1f4a | 46 | |
2b0d8c25 JK |
47 | start = memparse(p, &endp); |
48 | if (*endp == ',') { | |
49 | size = memparse(endp + 1, NULL); | |
012d1f4a RK |
50 | |
51 | phys_initrd_start = start; | |
52 | phys_initrd_size = size; | |
53 | } | |
2b0d8c25 | 54 | return 0; |
012d1f4a | 55 | } |
2b0d8c25 | 56 | early_param("initrd", early_initrd); |
012d1f4a RK |
57 | |
58 | static int __init parse_tag_initrd(const struct tag *tag) | |
59 | { | |
60 | printk(KERN_WARNING "ATAG_INITRD is deprecated; " | |
61 | "please update your bootloader.\n"); | |
62 | phys_initrd_start = __virt_to_phys(tag->u.initrd.start); | |
63 | phys_initrd_size = tag->u.initrd.size; | |
64 | return 0; | |
65 | } | |
66 | ||
67 | __tagtable(ATAG_INITRD, parse_tag_initrd); | |
68 | ||
69 | static int __init parse_tag_initrd2(const struct tag *tag) | |
70 | { | |
71 | phys_initrd_start = tag->u.initrd.start; | |
72 | phys_initrd_size = tag->u.initrd.size; | |
73 | return 0; | |
74 | } | |
75 | ||
76 | __tagtable(ATAG_INITRD2, parse_tag_initrd2); | |
1da177e4 | 77 | |
9eb8f674 GL |
78 | #ifdef CONFIG_OF_FLATTREE |
79 | void __init early_init_dt_setup_initrd_arch(unsigned long start, unsigned long end) | |
80 | { | |
81 | phys_initrd_start = start; | |
82 | phys_initrd_size = end - start; | |
83 | } | |
84 | #endif /* CONFIG_OF_FLATTREE */ | |
85 | ||
1da177e4 | 86 | /* |
4b5f32ce NP |
87 | * This keeps memory configuration data used by a couple memory |
88 | * initialization functions, as well as show_mem() for the skipping | |
89 | * of holes in the memory map. It is populated by arm_add_memory(). | |
1da177e4 | 90 | */ |
4b5f32ce | 91 | struct meminfo meminfo; |
5e709827 | 92 | |
b2b755b5 | 93 | void show_mem(unsigned int filter) |
1da177e4 LT |
94 | { |
95 | int free = 0, total = 0, reserved = 0; | |
be370302 | 96 | int shared = 0, cached = 0, slab = 0, i; |
5e709827 | 97 | struct meminfo * mi = &meminfo; |
1da177e4 LT |
98 | |
99 | printk("Mem-info:\n"); | |
7bf02ea2 | 100 | show_free_areas(filter); |
be370302 | 101 | |
4b59e6c4 DR |
102 | if (filter & SHOW_MEM_FILTER_PAGE_COUNT) |
103 | return; | |
104 | ||
be370302 RK |
105 | for_each_bank (i, mi) { |
106 | struct membank *bank = &mi->bank[i]; | |
107 | unsigned int pfn1, pfn2; | |
108 | struct page *page, *end; | |
109 | ||
110 | pfn1 = bank_pfn_start(bank); | |
111 | pfn2 = bank_pfn_end(bank); | |
112 | ||
113 | page = pfn_to_page(pfn1); | |
114 | end = pfn_to_page(pfn2 - 1) + 1; | |
115 | ||
116 | do { | |
117 | total++; | |
118 | if (PageReserved(page)) | |
119 | reserved++; | |
120 | else if (PageSwapCache(page)) | |
121 | cached++; | |
122 | else if (PageSlab(page)) | |
123 | slab++; | |
124 | else if (!page_count(page)) | |
125 | free++; | |
126 | else | |
127 | shared += page_count(page) - 1; | |
128 | page++; | |
129 | } while (page < end); | |
1da177e4 LT |
130 | } |
131 | ||
132 | printk("%d pages of RAM\n", total); | |
133 | printk("%d free pages\n", free); | |
134 | printk("%d reserved pages\n", reserved); | |
135 | printk("%d slab pages\n", slab); | |
136 | printk("%d pages shared\n", shared); | |
137 | printk("%d pages swap cached\n", cached); | |
138 | } | |
139 | ||
f25b4b4c | 140 | static void __init find_limits(unsigned long *min, unsigned long *max_low, |
27a3f0e9 | 141 | unsigned long *max_high) |
dde5828f | 142 | { |
f25b4b4c | 143 | struct meminfo *mi = &meminfo; |
dde5828f RK |
144 | int i; |
145 | ||
27a3f0e9 NP |
146 | /* This assumes the meminfo array is properly sorted */ |
147 | *min = bank_pfn_start(&mi->bank[0]); | |
148 | for_each_bank (i, mi) | |
149 | if (mi->bank[i].highmem) | |
150 | break; | |
151 | *max_low = bank_pfn_end(&mi->bank[i - 1]); | |
152 | *max_high = bank_pfn_end(&mi->bank[mi->nr_banks - 1]); | |
dde5828f RK |
153 | } |
154 | ||
a801d276 RK |
155 | static void __init arm_bootmem_init(unsigned long start_pfn, |
156 | unsigned long end_pfn) | |
1da177e4 | 157 | { |
719c1514 | 158 | struct memblock_region *reg; |
90072059 | 159 | unsigned int boot_pages; |
2778f620 | 160 | phys_addr_t bitmap; |
90072059 | 161 | pg_data_t *pgdat; |
1da177e4 | 162 | |
90072059 | 163 | /* |
2778f620 RK |
164 | * Allocate the bootmem bitmap page. This must be in a region |
165 | * of memory which has already been mapped. | |
90072059 RK |
166 | */ |
167 | boot_pages = bootmem_bootmap_pages(end_pfn - start_pfn); | |
2778f620 RK |
168 | bitmap = memblock_alloc_base(boot_pages << PAGE_SHIFT, L1_CACHE_BYTES, |
169 | __pfn_to_phys(end_pfn)); | |
1da177e4 | 170 | |
90072059 | 171 | /* |
be370302 | 172 | * Initialise the bootmem allocator, handing the |
90072059 RK |
173 | * memory banks over to bootmem. |
174 | */ | |
be370302 RK |
175 | node_set_online(0); |
176 | pgdat = NODE_DATA(0); | |
2778f620 | 177 | init_bootmem_node(pgdat, __phys_to_pfn(bitmap), start_pfn, end_pfn); |
1da177e4 | 178 | |
a801d276 RK |
179 | /* Free the lowmem regions from memblock into bootmem. */ |
180 | for_each_memblock(memory, reg) { | |
181 | unsigned long start = memblock_region_memory_base_pfn(reg); | |
182 | unsigned long end = memblock_region_memory_end_pfn(reg); | |
183 | ||
184 | if (end >= end_pfn) | |
185 | end = end_pfn; | |
186 | if (start >= end) | |
187 | break; | |
188 | ||
189 | free_bootmem(__pfn_to_phys(start), (end - start) << PAGE_SHIFT); | |
d2a38ef9 | 190 | } |
90072059 | 191 | |
a801d276 | 192 | /* Reserve the lowmem memblock reserved regions in bootmem. */ |
719c1514 | 193 | for_each_memblock(reserved, reg) { |
a801d276 RK |
194 | unsigned long start = memblock_region_reserved_base_pfn(reg); |
195 | unsigned long end = memblock_region_reserved_end_pfn(reg); | |
196 | ||
197 | if (end >= end_pfn) | |
198 | end = end_pfn; | |
199 | if (start >= end) | |
200 | break; | |
201 | ||
202 | reserve_bootmem(__pfn_to_phys(start), | |
203 | (end - start) << PAGE_SHIFT, BOOTMEM_DEFAULT); | |
1da177e4 | 204 | } |
b7a69ac3 RK |
205 | } |
206 | ||
be20902b | 207 | #ifdef CONFIG_ZONE_DMA |
65032018 | 208 | |
65032018 | 209 | unsigned long arm_dma_zone_size __read_mostly; |
65032018 NP |
210 | EXPORT_SYMBOL(arm_dma_zone_size); |
211 | ||
022ae537 RK |
212 | /* |
213 | * The DMA mask corresponding to the maximum bus address allocatable | |
214 | * using GFP_DMA. The default here places no restriction on DMA | |
215 | * allocations. This must be the smallest DMA mask in the system, | |
216 | * so a successful GFP_DMA allocation will always satisfy this. | |
217 | */ | |
4986e5c7 | 218 | phys_addr_t arm_dma_limit; |
022ae537 | 219 | |
be20902b RK |
220 | static void __init arm_adjust_dma_zone(unsigned long *size, unsigned long *hole, |
221 | unsigned long dma_size) | |
222 | { | |
223 | if (size[0] <= dma_size) | |
224 | return; | |
225 | ||
226 | size[ZONE_NORMAL] = size[0] - dma_size; | |
227 | size[ZONE_DMA] = dma_size; | |
228 | hole[ZONE_NORMAL] = hole[0]; | |
229 | hole[ZONE_DMA] = 0; | |
230 | } | |
231 | #endif | |
232 | ||
c7909509 MS |
233 | void __init setup_dma_zone(struct machine_desc *mdesc) |
234 | { | |
235 | #ifdef CONFIG_ZONE_DMA | |
236 | if (mdesc->dma_zone_size) { | |
237 | arm_dma_zone_size = mdesc->dma_zone_size; | |
238 | arm_dma_limit = PHYS_OFFSET + arm_dma_zone_size - 1; | |
239 | } else | |
240 | arm_dma_limit = 0xffffffff; | |
241 | #endif | |
242 | } | |
243 | ||
a2c54d2a RK |
244 | static void __init arm_bootmem_free(unsigned long min, unsigned long max_low, |
245 | unsigned long max_high) | |
b7a69ac3 RK |
246 | { |
247 | unsigned long zone_size[MAX_NR_ZONES], zhole_size[MAX_NR_ZONES]; | |
a2c54d2a | 248 | struct memblock_region *reg; |
b7a69ac3 | 249 | |
90072059 | 250 | /* |
be370302 | 251 | * initialise the zones. |
90072059 RK |
252 | */ |
253 | memset(zone_size, 0, sizeof(zone_size)); | |
90072059 RK |
254 | |
255 | /* | |
be370302 RK |
256 | * The memory size has already been determined. If we need |
257 | * to do anything fancy with the allocation of this memory | |
258 | * to the zones, now is the time to do it. | |
90072059 | 259 | */ |
dde5828f RK |
260 | zone_size[0] = max_low - min; |
261 | #ifdef CONFIG_HIGHMEM | |
262 | zone_size[ZONE_HIGHMEM] = max_high - max_low; | |
263 | #endif | |
90072059 RK |
264 | |
265 | /* | |
be370302 RK |
266 | * Calculate the size of the holes. |
267 | * holes = node_size - sum(bank_sizes) | |
90072059 | 268 | */ |
dde5828f | 269 | memcpy(zhole_size, zone_size, sizeof(zhole_size)); |
a2c54d2a RK |
270 | for_each_memblock(memory, reg) { |
271 | unsigned long start = memblock_region_memory_base_pfn(reg); | |
272 | unsigned long end = memblock_region_memory_end_pfn(reg); | |
273 | ||
274 | if (start < max_low) { | |
275 | unsigned long low_end = min(end, max_low); | |
276 | zhole_size[0] -= low_end - start; | |
277 | } | |
dde5828f | 278 | #ifdef CONFIG_HIGHMEM |
a2c54d2a RK |
279 | if (end > max_low) { |
280 | unsigned long high_start = max(start, max_low); | |
281 | zhole_size[ZONE_HIGHMEM] -= end - high_start; | |
282 | } | |
dde5828f | 283 | #endif |
dde5828f | 284 | } |
90072059 | 285 | |
65032018 | 286 | #ifdef CONFIG_ZONE_DMA |
90072059 RK |
287 | /* |
288 | * Adjust the sizes according to any special requirements for | |
289 | * this machine type. | |
290 | */ | |
c7909509 | 291 | if (arm_dma_zone_size) |
65032018 NP |
292 | arm_adjust_dma_zone(zone_size, zhole_size, |
293 | arm_dma_zone_size >> PAGE_SHIFT); | |
be20902b | 294 | #endif |
90072059 | 295 | |
be370302 | 296 | free_area_init_node(0, zone_size, min, zhole_size); |
1da177e4 LT |
297 | } |
298 | ||
7b7bf499 | 299 | #ifdef CONFIG_HAVE_ARCH_PFN_VALID |
b7cfda9f RK |
300 | int pfn_valid(unsigned long pfn) |
301 | { | |
fb492c91 | 302 | return memblock_is_memory(__pfn_to_phys(pfn)); |
b7cfda9f RK |
303 | } |
304 | EXPORT_SYMBOL(pfn_valid); | |
7b7bf499 | 305 | #endif |
657e12fd | 306 | |
7b7bf499 | 307 | #ifndef CONFIG_SPARSEMEM |
14904927 | 308 | static void __init arm_memory_present(void) |
657e12fd RK |
309 | { |
310 | } | |
311 | #else | |
14904927 | 312 | static void __init arm_memory_present(void) |
657e12fd | 313 | { |
719c1514 | 314 | struct memblock_region *reg; |
719c1514 | 315 | |
7c996361 | 316 | for_each_memblock(memory, reg) |
c7fc2de0 YL |
317 | memory_present(0, memblock_region_memory_base_pfn(reg), |
318 | memblock_region_memory_end_pfn(reg)); | |
657e12fd | 319 | } |
b7cfda9f RK |
320 | #endif |
321 | ||
716a3dc2 RK |
322 | static bool arm_memblock_steal_permitted = true; |
323 | ||
bc2827d0 | 324 | phys_addr_t __init arm_memblock_steal(phys_addr_t size, phys_addr_t align) |
716a3dc2 RK |
325 | { |
326 | phys_addr_t phys; | |
327 | ||
328 | BUG_ON(!arm_memblock_steal_permitted); | |
329 | ||
7ac68a4c | 330 | phys = memblock_alloc_base(size, align, MEMBLOCK_ALLOC_ANYWHERE); |
716a3dc2 RK |
331 | memblock_free(phys, size); |
332 | memblock_remove(phys, size); | |
333 | ||
334 | return phys; | |
335 | } | |
336 | ||
8d717a52 | 337 | void __init arm_memblock_init(struct meminfo *mi, struct machine_desc *mdesc) |
2778f620 RK |
338 | { |
339 | int i; | |
340 | ||
2778f620 RK |
341 | for (i = 0; i < mi->nr_banks; i++) |
342 | memblock_add(mi->bank[i].start, mi->bank[i].size); | |
343 | ||
344 | /* Register the kernel text, kernel data and initrd with memblock. */ | |
345 | #ifdef CONFIG_XIP_KERNEL | |
842eab40 | 346 | memblock_reserve(__pa(_sdata), _end - _sdata); |
2778f620 RK |
347 | #else |
348 | memblock_reserve(__pa(_stext), _end - _stext); | |
349 | #endif | |
350 | #ifdef CONFIG_BLK_DEV_INITRD | |
8f4b8c76 RK |
351 | if (phys_initrd_size && |
352 | !memblock_is_region_memory(phys_initrd_start, phys_initrd_size)) { | |
353 | pr_err("INITRD: 0x%08lx+0x%08lx is not a memory region - disabling initrd\n", | |
354 | phys_initrd_start, phys_initrd_size); | |
355 | phys_initrd_start = phys_initrd_size = 0; | |
356 | } | |
b0a2679d RK |
357 | if (phys_initrd_size && |
358 | memblock_is_region_reserved(phys_initrd_start, phys_initrd_size)) { | |
359 | pr_err("INITRD: 0x%08lx+0x%08lx overlaps in-use memory region - disabling initrd\n", | |
360 | phys_initrd_start, phys_initrd_size); | |
361 | phys_initrd_start = phys_initrd_size = 0; | |
362 | } | |
2778f620 RK |
363 | if (phys_initrd_size) { |
364 | memblock_reserve(phys_initrd_start, phys_initrd_size); | |
365 | ||
366 | /* Now convert initrd to virtual addresses */ | |
367 | initrd_start = __phys_to_virt(phys_initrd_start); | |
368 | initrd_end = initrd_start + phys_initrd_size; | |
369 | } | |
370 | #endif | |
371 | ||
372 | arm_mm_memblock_reserve(); | |
93c02ab4 | 373 | arm_dt_memblock_reserve(); |
2778f620 | 374 | |
8d717a52 RK |
375 | /* reserve any platform specific memblock areas */ |
376 | if (mdesc->reserve) | |
377 | mdesc->reserve(); | |
378 | ||
c7909509 MS |
379 | /* |
380 | * reserve memory for DMA contigouos allocations, | |
381 | * must come from DMA area inside low memory | |
382 | */ | |
383 | dma_contiguous_reserve(min(arm_dma_limit, arm_lowmem_limit)); | |
384 | ||
716a3dc2 | 385 | arm_memblock_steal_permitted = false; |
1aadc056 | 386 | memblock_allow_resize(); |
2778f620 RK |
387 | memblock_dump_all(); |
388 | } | |
389 | ||
8d717a52 | 390 | void __init bootmem_init(void) |
1da177e4 | 391 | { |
dde5828f | 392 | unsigned long min, max_low, max_high; |
1da177e4 | 393 | |
dde5828f RK |
394 | max_low = max_high = 0; |
395 | ||
f25b4b4c | 396 | find_limits(&min, &max_low, &max_high); |
dde5828f | 397 | |
a801d276 | 398 | arm_bootmem_init(min, max_low); |
dde5828f | 399 | |
be370302 RK |
400 | /* |
401 | * Sparsemem tries to allocate bootmem in memory_present(), | |
402 | * so must be done after the fixed reservations | |
403 | */ | |
eda2e5dc | 404 | arm_memory_present(); |
1da177e4 | 405 | |
b7a69ac3 RK |
406 | /* |
407 | * sparse_init() needs the bootmem allocator up and running. | |
408 | */ | |
409 | sparse_init(); | |
410 | ||
411 | /* | |
be370302 | 412 | * Now free the memory - free_area_init_node needs |
b7a69ac3 RK |
413 | * the sparse mem_map arrays initialized by sparse_init() |
414 | * for memmap_init_zone(), otherwise all PFNs are invalid. | |
415 | */ | |
a2c54d2a | 416 | arm_bootmem_free(min, max_low, max_high); |
b7a69ac3 | 417 | |
90072059 RK |
418 | /* |
419 | * This doesn't seem to be used by the Linux memory manager any | |
420 | * more, but is used by ll_rw_block. If we can get rid of it, we | |
421 | * also get rid of some of the stuff above as well. | |
422 | * | |
423 | * Note: max_low_pfn and max_pfn reflect the number of _pages_ in | |
424 | * the system, not the maximum PFN. | |
425 | */ | |
dde5828f RK |
426 | max_low_pfn = max_low - PHYS_PFN_OFFSET; |
427 | max_pfn = max_high - PHYS_PFN_OFFSET; | |
90072059 | 428 | } |
1da177e4 | 429 | |
54d52573 SB |
430 | /* |
431 | * Poison init memory with an undefined instruction (ARM) or a branch to an | |
432 | * undefined instruction (Thumb). | |
433 | */ | |
434 | static inline void poison_init_mem(void *s, size_t count) | |
435 | { | |
436 | u32 *p = (u32 *)s; | |
bf912d99 | 437 | for (; count != 0; count -= 4) |
54d52573 SB |
438 | *p++ = 0xe7fddef0; |
439 | } | |
440 | ||
a013053d | 441 | static inline void |
be370302 | 442 | free_memmap(unsigned long start_pfn, unsigned long end_pfn) |
a013053d RK |
443 | { |
444 | struct page *start_pg, *end_pg; | |
445 | unsigned long pg, pgend; | |
446 | ||
447 | /* | |
448 | * Convert start_pfn/end_pfn to a struct page pointer. | |
449 | */ | |
3257f43d | 450 | start_pg = pfn_to_page(start_pfn - 1) + 1; |
9af386c8 | 451 | end_pg = pfn_to_page(end_pfn - 1) + 1; |
a013053d RK |
452 | |
453 | /* | |
454 | * Convert to physical addresses, and | |
455 | * round start upwards and end downwards. | |
456 | */ | |
cae6292b WD |
457 | pg = (unsigned long)PAGE_ALIGN(__pa(start_pg)); |
458 | pgend = (unsigned long)__pa(end_pg) & PAGE_MASK; | |
a013053d RK |
459 | |
460 | /* | |
461 | * If there are free pages between these, | |
462 | * free the section of the memmap array. | |
463 | */ | |
464 | if (pg < pgend) | |
be370302 | 465 | free_bootmem(pg, pgend - pg); |
a013053d RK |
466 | } |
467 | ||
468 | /* | |
469 | * The mem_map array can get very big. Free the unused area of the memory map. | |
470 | */ | |
be370302 | 471 | static void __init free_unused_memmap(struct meminfo *mi) |
a013053d RK |
472 | { |
473 | unsigned long bank_start, prev_bank_end = 0; | |
474 | unsigned int i; | |
475 | ||
476 | /* | |
3260e529 MB |
477 | * This relies on each bank being in address order. |
478 | * The banks are sorted previously in bootmem_init(). | |
a013053d | 479 | */ |
be370302 | 480 | for_each_bank(i, mi) { |
d2a38ef9 RK |
481 | struct membank *bank = &mi->bank[i]; |
482 | ||
483 | bank_start = bank_pfn_start(bank); | |
a013053d | 484 | |
9af386c8 WD |
485 | #ifdef CONFIG_SPARSEMEM |
486 | /* | |
487 | * Take care not to free memmap entries that don't exist | |
488 | * due to SPARSEMEM sections which aren't present. | |
489 | */ | |
490 | bank_start = min(bank_start, | |
491 | ALIGN(prev_bank_end, PAGES_PER_SECTION)); | |
002ea9ee LW |
492 | #else |
493 | /* | |
494 | * Align down here since the VM subsystem insists that the | |
495 | * memmap entries are valid from the bank start aligned to | |
496 | * MAX_ORDER_NR_PAGES. | |
497 | */ | |
498 | bank_start = round_down(bank_start, MAX_ORDER_NR_PAGES); | |
9af386c8 | 499 | #endif |
a013053d RK |
500 | /* |
501 | * If we had a previous bank, and there is a space | |
502 | * between the current bank and the previous, free it. | |
503 | */ | |
3260e529 | 504 | if (prev_bank_end && prev_bank_end < bank_start) |
be370302 | 505 | free_memmap(prev_bank_end, bank_start); |
a013053d | 506 | |
3260e529 MB |
507 | /* |
508 | * Align up here since the VM subsystem insists that the | |
509 | * memmap entries are valid from the bank end aligned to | |
510 | * MAX_ORDER_NR_PAGES. | |
511 | */ | |
512 | prev_bank_end = ALIGN(bank_pfn_end(bank), MAX_ORDER_NR_PAGES); | |
a013053d | 513 | } |
9af386c8 WD |
514 | |
515 | #ifdef CONFIG_SPARSEMEM | |
516 | if (!IS_ALIGNED(prev_bank_end, PAGES_PER_SECTION)) | |
517 | free_memmap(prev_bank_end, | |
518 | ALIGN(prev_bank_end, PAGES_PER_SECTION)); | |
519 | #endif | |
a013053d RK |
520 | } |
521 | ||
83db0384 JL |
522 | #ifdef CONFIG_HIGHMEM |
523 | static inline void free_area_high(unsigned long pfn, unsigned long end) | |
524 | { | |
525 | for (; pfn < end; pfn++) { | |
526 | __free_reserved_page(pfn_to_page(pfn)); | |
527 | totalhigh_pages++; | |
528 | } | |
529 | } | |
530 | #endif | |
531 | ||
d0e775af RK |
532 | static void __init free_highpages(void) |
533 | { | |
534 | #ifdef CONFIG_HIGHMEM | |
df4f14c7 RK |
535 | unsigned long max_low = max_low_pfn + PHYS_PFN_OFFSET; |
536 | struct memblock_region *mem, *res; | |
d0e775af RK |
537 | |
538 | /* set highmem page free */ | |
df4f14c7 RK |
539 | for_each_memblock(memory, mem) { |
540 | unsigned long start = memblock_region_memory_base_pfn(mem); | |
541 | unsigned long end = memblock_region_memory_end_pfn(mem); | |
542 | ||
543 | /* Ignore complete lowmem entries */ | |
544 | if (end <= max_low) | |
545 | continue; | |
546 | ||
547 | /* Truncate partial highmem entries */ | |
548 | if (start < max_low) | |
549 | start = max_low; | |
550 | ||
551 | /* Find and exclude any reserved regions */ | |
552 | for_each_memblock(reserved, res) { | |
553 | unsigned long res_start, res_end; | |
554 | ||
555 | res_start = memblock_region_reserved_base_pfn(res); | |
556 | res_end = memblock_region_reserved_end_pfn(res); | |
557 | ||
558 | if (res_end < start) | |
559 | continue; | |
560 | if (res_start < start) | |
561 | res_start = start; | |
562 | if (res_start > end) | |
563 | res_start = end; | |
564 | if (res_end > end) | |
565 | res_end = end; | |
566 | if (res_start != start) | |
83db0384 | 567 | free_area_high(start, res_start); |
df4f14c7 RK |
568 | start = res_end; |
569 | if (start == end) | |
570 | break; | |
571 | } | |
572 | ||
573 | /* And now free anything which remains */ | |
574 | if (start < end) | |
83db0384 | 575 | free_area_high(start, end); |
d0e775af RK |
576 | } |
577 | totalram_pages += totalhigh_pages; | |
578 | #endif | |
579 | } | |
580 | ||
1da177e4 LT |
581 | /* |
582 | * mem_init() marks the free areas in the mem_map and tells us how much | |
583 | * memory is free. This is done after various parts of the system have | |
584 | * claimed their memory after the kernel image. | |
585 | */ | |
586 | void __init mem_init(void) | |
587 | { | |
db9ef1af | 588 | unsigned long reserved_pages, free_pages; |
47ea3c15 | 589 | struct memblock_region *reg; |
be370302 | 590 | int i; |
1dbd30e9 LW |
591 | #ifdef CONFIG_HAVE_TCM |
592 | /* These pointers are filled in on TCM detection */ | |
593 | extern u32 dtcm_end; | |
594 | extern u32 itcm_end; | |
595 | #endif | |
1da177e4 | 596 | |
3835f6cb | 597 | max_mapnr = pfn_to_page(max_pfn + PHYS_PFN_OFFSET) - mem_map; |
1da177e4 | 598 | |
1da177e4 | 599 | /* this will put all unused low memory onto the freelists */ |
be370302 | 600 | free_unused_memmap(&meminfo); |
a013053d | 601 | |
be370302 | 602 | totalram_pages += free_all_bootmem(); |
1da177e4 LT |
603 | |
604 | #ifdef CONFIG_SA1111 | |
605 | /* now that our DMA memory is actually so designated, we can free it */ | |
83db0384 | 606 | free_reserved_area(__va(PHYS_PFN_OFFSET), swapper_pg_dir, 0, NULL); |
1da177e4 LT |
607 | #endif |
608 | ||
d0e775af | 609 | free_highpages(); |
3835f6cb | 610 | |
db9ef1af FB |
611 | reserved_pages = free_pages = 0; |
612 | ||
be370302 RK |
613 | for_each_bank(i, &meminfo) { |
614 | struct membank *bank = &meminfo.bank[i]; | |
615 | unsigned int pfn1, pfn2; | |
616 | struct page *page, *end; | |
617 | ||
618 | pfn1 = bank_pfn_start(bank); | |
619 | pfn2 = bank_pfn_end(bank); | |
620 | ||
621 | page = pfn_to_page(pfn1); | |
622 | end = pfn_to_page(pfn2 - 1) + 1; | |
623 | ||
624 | do { | |
625 | if (PageReserved(page)) | |
626 | reserved_pages++; | |
627 | else if (!page_count(page)) | |
628 | free_pages++; | |
629 | page++; | |
630 | } while (page < end); | |
db9ef1af FB |
631 | } |
632 | ||
1da177e4 LT |
633 | /* |
634 | * Since our memory may not be contiguous, calculate the | |
635 | * real number of pages we have in this system | |
636 | */ | |
637 | printk(KERN_INFO "Memory:"); | |
1da177e4 | 638 | num_physpages = 0; |
47ea3c15 RK |
639 | for_each_memblock(memory, reg) { |
640 | unsigned long pages = memblock_region_memory_end_pfn(reg) - | |
641 | memblock_region_memory_base_pfn(reg); | |
642 | num_physpages += pages; | |
643 | printk(" %ldMB", pages >> (20 - PAGE_SHIFT)); | |
1da177e4 | 644 | } |
1da177e4 | 645 | printk(" = %luMB total\n", num_physpages >> (20 - PAGE_SHIFT)); |
6db015e4 | 646 | |
db9ef1af FB |
647 | printk(KERN_NOTICE "Memory: %luk/%luk available, %luk reserved, %luK highmem\n", |
648 | nr_free_pages() << (PAGE_SHIFT-10), | |
649 | free_pages << (PAGE_SHIFT-10), | |
650 | reserved_pages << (PAGE_SHIFT-10), | |
4b529401 | 651 | totalhigh_pages << (PAGE_SHIFT-10)); |
1da177e4 | 652 | |
db9ef1af FB |
653 | #define MLK(b, t) b, t, ((t) - (b)) >> 10 |
654 | #define MLM(b, t) b, t, ((t) - (b)) >> 20 | |
655 | #define MLK_ROUNDUP(b, t) b, t, DIV_ROUND_UP(((t) - (b)), SZ_1K) | |
656 | ||
657 | printk(KERN_NOTICE "Virtual kernel memory layout:\n" | |
658 | " vector : 0x%08lx - 0x%08lx (%4ld kB)\n" | |
07d2a5c7 | 659 | #ifdef CONFIG_HAVE_TCM |
07d2a5c7 | 660 | " DTCM : 0x%08lx - 0x%08lx (%4ld kB)\n" |
07d2a5c7 | 661 | " ITCM : 0x%08lx - 0x%08lx (%4ld kB)\n" |
07d2a5c7 | 662 | #endif |
db9ef1af FB |
663 | " fixmap : 0x%08lx - 0x%08lx (%4ld kB)\n" |
664 | " vmalloc : 0x%08lx - 0x%08lx (%4ld MB)\n" | |
665 | " lowmem : 0x%08lx - 0x%08lx (%4ld MB)\n" | |
666 | #ifdef CONFIG_HIGHMEM | |
667 | " pkmap : 0x%08lx - 0x%08lx (%4ld MB)\n" | |
668 | #endif | |
d9277d51 | 669 | #ifdef CONFIG_MODULES |
db9ef1af | 670 | " modules : 0x%08lx - 0x%08lx (%4ld MB)\n" |
d9277d51 | 671 | #endif |
db9ef1af | 672 | " .text : 0x%p" " - 0x%p" " (%4d kB)\n" |
3835d69a | 673 | " .init : 0x%p" " - 0x%p" " (%4d kB)\n" |
45f6d7e0 RV |
674 | " .data : 0x%p" " - 0x%p" " (%4d kB)\n" |
675 | " .bss : 0x%p" " - 0x%p" " (%4d kB)\n", | |
db9ef1af FB |
676 | |
677 | MLK(UL(CONFIG_VECTORS_BASE), UL(CONFIG_VECTORS_BASE) + | |
678 | (PAGE_SIZE)), | |
07d2a5c7 | 679 | #ifdef CONFIG_HAVE_TCM |
1dbd30e9 LW |
680 | MLK(DTCM_OFFSET, (unsigned long) dtcm_end), |
681 | MLK(ITCM_OFFSET, (unsigned long) itcm_end), | |
07d2a5c7 | 682 | #endif |
db9ef1af | 683 | MLK(FIXADDR_START, FIXADDR_TOP), |
c931b4f6 | 684 | MLM(VMALLOC_START, VMALLOC_END), |
db9ef1af FB |
685 | MLM(PAGE_OFFSET, (unsigned long)high_memory), |
686 | #ifdef CONFIG_HIGHMEM | |
687 | MLM(PKMAP_BASE, (PKMAP_BASE) + (LAST_PKMAP) * | |
688 | (PAGE_SIZE)), | |
689 | #endif | |
d9277d51 | 690 | #ifdef CONFIG_MODULES |
db9ef1af | 691 | MLM(MODULES_VADDR, MODULES_END), |
d9277d51 | 692 | #endif |
db9ef1af | 693 | |
db9ef1af | 694 | MLK_ROUNDUP(_text, _etext), |
3835d69a | 695 | MLK_ROUNDUP(__init_begin, __init_end), |
45f6d7e0 RV |
696 | MLK_ROUNDUP(_sdata, _edata), |
697 | MLK_ROUNDUP(__bss_start, __bss_stop)); | |
db9ef1af FB |
698 | |
699 | #undef MLK | |
700 | #undef MLM | |
701 | #undef MLK_ROUNDUP | |
702 | ||
a1839272 FB |
703 | /* |
704 | * Check boundaries twice: Some fundamental inconsistencies can | |
705 | * be detected at build time already. | |
706 | */ | |
707 | #ifdef CONFIG_MMU | |
a1839272 FB |
708 | BUILD_BUG_ON(TASK_SIZE > MODULES_VADDR); |
709 | BUG_ON(TASK_SIZE > MODULES_VADDR); | |
710 | #endif | |
711 | ||
712 | #ifdef CONFIG_HIGHMEM | |
713 | BUILD_BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE > PAGE_OFFSET); | |
714 | BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE > PAGE_OFFSET); | |
715 | #endif | |
716 | ||
1da177e4 LT |
717 | if (PAGE_SIZE >= 16384 && num_physpages <= 128) { |
718 | extern int sysctl_overcommit_memory; | |
719 | /* | |
720 | * On a machine this small we won't get | |
721 | * anywhere without overcommit, so turn | |
722 | * it on by default. | |
723 | */ | |
724 | sysctl_overcommit_memory = OVERCOMMIT_ALWAYS; | |
725 | } | |
726 | } | |
727 | ||
728 | void free_initmem(void) | |
729 | { | |
bc581770 | 730 | #ifdef CONFIG_HAVE_TCM |
ea208f64 | 731 | extern char __tcm_start, __tcm_end; |
bc581770 | 732 | |
54d52573 | 733 | poison_init_mem(&__tcm_start, &__tcm_end - &__tcm_start); |
83db0384 | 734 | free_reserved_area(&__tcm_start, &__tcm_end, 0, "TCM link"); |
bc581770 LW |
735 | #endif |
736 | ||
54d52573 | 737 | poison_init_mem(__init_begin, __init_end - __init_begin); |
6db015e4 | 738 | if (!machine_is_integrator() && !machine_is_cintegrator()) |
83db0384 | 739 | free_initmem_default(0); |
1da177e4 LT |
740 | } |
741 | ||
742 | #ifdef CONFIG_BLK_DEV_INITRD | |
743 | ||
744 | static int keep_initrd; | |
745 | ||
746 | void free_initrd_mem(unsigned long start, unsigned long end) | |
747 | { | |
54d52573 SB |
748 | if (!keep_initrd) { |
749 | poison_init_mem((void *)start, PAGE_ALIGN(end) - start); | |
83db0384 | 750 | free_reserved_area(start, end, 0, "initrd"); |
54d52573 | 751 | } |
1da177e4 LT |
752 | } |
753 | ||
754 | static int __init keepinitrd_setup(char *__unused) | |
755 | { | |
756 | keep_initrd = 1; | |
757 | return 1; | |
758 | } | |
759 | ||
760 | __setup("keepinitrd", keepinitrd_setup); | |
761 | #endif |