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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 RK |
101 | |
102 | for_each_bank (i, mi) { | |
103 | struct membank *bank = &mi->bank[i]; | |
104 | unsigned int pfn1, pfn2; | |
105 | struct page *page, *end; | |
106 | ||
107 | pfn1 = bank_pfn_start(bank); | |
108 | pfn2 = bank_pfn_end(bank); | |
109 | ||
110 | page = pfn_to_page(pfn1); | |
111 | end = pfn_to_page(pfn2 - 1) + 1; | |
112 | ||
113 | do { | |
114 | total++; | |
115 | if (PageReserved(page)) | |
116 | reserved++; | |
117 | else if (PageSwapCache(page)) | |
118 | cached++; | |
119 | else if (PageSlab(page)) | |
120 | slab++; | |
121 | else if (!page_count(page)) | |
122 | free++; | |
123 | else | |
124 | shared += page_count(page) - 1; | |
125 | page++; | |
126 | } while (page < end); | |
1da177e4 LT |
127 | } |
128 | ||
129 | printk("%d pages of RAM\n", total); | |
130 | printk("%d free pages\n", free); | |
131 | printk("%d reserved pages\n", reserved); | |
132 | printk("%d slab pages\n", slab); | |
133 | printk("%d pages shared\n", shared); | |
134 | printk("%d pages swap cached\n", cached); | |
135 | } | |
136 | ||
f25b4b4c | 137 | static void __init find_limits(unsigned long *min, unsigned long *max_low, |
27a3f0e9 | 138 | unsigned long *max_high) |
dde5828f | 139 | { |
f25b4b4c | 140 | struct meminfo *mi = &meminfo; |
dde5828f RK |
141 | int i; |
142 | ||
27a3f0e9 NP |
143 | /* This assumes the meminfo array is properly sorted */ |
144 | *min = bank_pfn_start(&mi->bank[0]); | |
145 | for_each_bank (i, mi) | |
146 | if (mi->bank[i].highmem) | |
147 | break; | |
148 | *max_low = bank_pfn_end(&mi->bank[i - 1]); | |
149 | *max_high = bank_pfn_end(&mi->bank[mi->nr_banks - 1]); | |
dde5828f RK |
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 | 204 | #ifdef CONFIG_ZONE_DMA |
65032018 | 205 | |
65032018 | 206 | unsigned long arm_dma_zone_size __read_mostly; |
65032018 NP |
207 | EXPORT_SYMBOL(arm_dma_zone_size); |
208 | ||
022ae537 RK |
209 | /* |
210 | * The DMA mask corresponding to the maximum bus address allocatable | |
211 | * using GFP_DMA. The default here places no restriction on DMA | |
212 | * allocations. This must be the smallest DMA mask in the system, | |
213 | * so a successful GFP_DMA allocation will always satisfy this. | |
214 | */ | |
4986e5c7 | 215 | phys_addr_t arm_dma_limit; |
022ae537 | 216 | |
be20902b RK |
217 | static void __init arm_adjust_dma_zone(unsigned long *size, unsigned long *hole, |
218 | unsigned long dma_size) | |
219 | { | |
220 | if (size[0] <= dma_size) | |
221 | return; | |
222 | ||
223 | size[ZONE_NORMAL] = size[0] - dma_size; | |
224 | size[ZONE_DMA] = dma_size; | |
225 | hole[ZONE_NORMAL] = hole[0]; | |
226 | hole[ZONE_DMA] = 0; | |
227 | } | |
228 | #endif | |
229 | ||
c7909509 MS |
230 | void __init setup_dma_zone(struct machine_desc *mdesc) |
231 | { | |
232 | #ifdef CONFIG_ZONE_DMA | |
233 | if (mdesc->dma_zone_size) { | |
234 | arm_dma_zone_size = mdesc->dma_zone_size; | |
235 | arm_dma_limit = PHYS_OFFSET + arm_dma_zone_size - 1; | |
236 | } else | |
237 | arm_dma_limit = 0xffffffff; | |
238 | #endif | |
239 | } | |
240 | ||
a2c54d2a RK |
241 | static void __init arm_bootmem_free(unsigned long min, unsigned long max_low, |
242 | unsigned long max_high) | |
b7a69ac3 RK |
243 | { |
244 | unsigned long zone_size[MAX_NR_ZONES], zhole_size[MAX_NR_ZONES]; | |
a2c54d2a | 245 | struct memblock_region *reg; |
b7a69ac3 | 246 | |
90072059 | 247 | /* |
be370302 | 248 | * initialise the zones. |
90072059 RK |
249 | */ |
250 | memset(zone_size, 0, sizeof(zone_size)); | |
90072059 RK |
251 | |
252 | /* | |
be370302 RK |
253 | * The memory size has already been determined. If we need |
254 | * to do anything fancy with the allocation of this memory | |
255 | * to the zones, now is the time to do it. | |
90072059 | 256 | */ |
dde5828f RK |
257 | zone_size[0] = max_low - min; |
258 | #ifdef CONFIG_HIGHMEM | |
259 | zone_size[ZONE_HIGHMEM] = max_high - max_low; | |
260 | #endif | |
90072059 RK |
261 | |
262 | /* | |
be370302 RK |
263 | * Calculate the size of the holes. |
264 | * holes = node_size - sum(bank_sizes) | |
90072059 | 265 | */ |
dde5828f | 266 | memcpy(zhole_size, zone_size, sizeof(zhole_size)); |
a2c54d2a RK |
267 | for_each_memblock(memory, reg) { |
268 | unsigned long start = memblock_region_memory_base_pfn(reg); | |
269 | unsigned long end = memblock_region_memory_end_pfn(reg); | |
270 | ||
271 | if (start < max_low) { | |
272 | unsigned long low_end = min(end, max_low); | |
273 | zhole_size[0] -= low_end - start; | |
274 | } | |
dde5828f | 275 | #ifdef CONFIG_HIGHMEM |
a2c54d2a RK |
276 | if (end > max_low) { |
277 | unsigned long high_start = max(start, max_low); | |
278 | zhole_size[ZONE_HIGHMEM] -= end - high_start; | |
279 | } | |
dde5828f | 280 | #endif |
dde5828f | 281 | } |
90072059 | 282 | |
65032018 | 283 | #ifdef CONFIG_ZONE_DMA |
90072059 RK |
284 | /* |
285 | * Adjust the sizes according to any special requirements for | |
286 | * this machine type. | |
287 | */ | |
c7909509 | 288 | if (arm_dma_zone_size) |
65032018 NP |
289 | arm_adjust_dma_zone(zone_size, zhole_size, |
290 | arm_dma_zone_size >> PAGE_SHIFT); | |
be20902b | 291 | #endif |
90072059 | 292 | |
be370302 | 293 | free_area_init_node(0, zone_size, min, zhole_size); |
1da177e4 LT |
294 | } |
295 | ||
7b7bf499 | 296 | #ifdef CONFIG_HAVE_ARCH_PFN_VALID |
b7cfda9f RK |
297 | int pfn_valid(unsigned long pfn) |
298 | { | |
fb492c91 | 299 | return memblock_is_memory(__pfn_to_phys(pfn)); |
b7cfda9f RK |
300 | } |
301 | EXPORT_SYMBOL(pfn_valid); | |
7b7bf499 | 302 | #endif |
657e12fd | 303 | |
7b7bf499 | 304 | #ifndef CONFIG_SPARSEMEM |
14904927 | 305 | static void __init arm_memory_present(void) |
657e12fd RK |
306 | { |
307 | } | |
308 | #else | |
14904927 | 309 | static void __init arm_memory_present(void) |
657e12fd | 310 | { |
719c1514 | 311 | struct memblock_region *reg; |
719c1514 | 312 | |
7c996361 | 313 | for_each_memblock(memory, reg) |
c7fc2de0 YL |
314 | memory_present(0, memblock_region_memory_base_pfn(reg), |
315 | memblock_region_memory_end_pfn(reg)); | |
657e12fd | 316 | } |
b7cfda9f RK |
317 | #endif |
318 | ||
716a3dc2 RK |
319 | static bool arm_memblock_steal_permitted = true; |
320 | ||
bc2827d0 | 321 | phys_addr_t __init arm_memblock_steal(phys_addr_t size, phys_addr_t align) |
716a3dc2 RK |
322 | { |
323 | phys_addr_t phys; | |
324 | ||
325 | BUG_ON(!arm_memblock_steal_permitted); | |
326 | ||
7ac68a4c | 327 | phys = memblock_alloc_base(size, align, MEMBLOCK_ALLOC_ANYWHERE); |
716a3dc2 RK |
328 | memblock_free(phys, size); |
329 | memblock_remove(phys, size); | |
330 | ||
331 | return phys; | |
332 | } | |
333 | ||
8d717a52 | 334 | void __init arm_memblock_init(struct meminfo *mi, struct machine_desc *mdesc) |
2778f620 RK |
335 | { |
336 | int i; | |
337 | ||
2778f620 RK |
338 | for (i = 0; i < mi->nr_banks; i++) |
339 | memblock_add(mi->bank[i].start, mi->bank[i].size); | |
340 | ||
341 | /* Register the kernel text, kernel data and initrd with memblock. */ | |
342 | #ifdef CONFIG_XIP_KERNEL | |
842eab40 | 343 | memblock_reserve(__pa(_sdata), _end - _sdata); |
2778f620 RK |
344 | #else |
345 | memblock_reserve(__pa(_stext), _end - _stext); | |
346 | #endif | |
347 | #ifdef CONFIG_BLK_DEV_INITRD | |
8f4b8c76 RK |
348 | if (phys_initrd_size && |
349 | !memblock_is_region_memory(phys_initrd_start, phys_initrd_size)) { | |
350 | pr_err("INITRD: 0x%08lx+0x%08lx is not a memory region - disabling initrd\n", | |
351 | phys_initrd_start, phys_initrd_size); | |
352 | phys_initrd_start = phys_initrd_size = 0; | |
353 | } | |
b0a2679d RK |
354 | if (phys_initrd_size && |
355 | memblock_is_region_reserved(phys_initrd_start, phys_initrd_size)) { | |
356 | pr_err("INITRD: 0x%08lx+0x%08lx overlaps in-use memory region - disabling initrd\n", | |
357 | phys_initrd_start, phys_initrd_size); | |
358 | phys_initrd_start = phys_initrd_size = 0; | |
359 | } | |
2778f620 RK |
360 | if (phys_initrd_size) { |
361 | memblock_reserve(phys_initrd_start, phys_initrd_size); | |
362 | ||
363 | /* Now convert initrd to virtual addresses */ | |
364 | initrd_start = __phys_to_virt(phys_initrd_start); | |
365 | initrd_end = initrd_start + phys_initrd_size; | |
366 | } | |
367 | #endif | |
368 | ||
369 | arm_mm_memblock_reserve(); | |
93c02ab4 | 370 | arm_dt_memblock_reserve(); |
2778f620 | 371 | |
8d717a52 RK |
372 | /* reserve any platform specific memblock areas */ |
373 | if (mdesc->reserve) | |
374 | mdesc->reserve(); | |
375 | ||
c7909509 MS |
376 | /* |
377 | * reserve memory for DMA contigouos allocations, | |
378 | * must come from DMA area inside low memory | |
379 | */ | |
380 | dma_contiguous_reserve(min(arm_dma_limit, arm_lowmem_limit)); | |
381 | ||
716a3dc2 | 382 | arm_memblock_steal_permitted = false; |
1aadc056 | 383 | memblock_allow_resize(); |
2778f620 RK |
384 | memblock_dump_all(); |
385 | } | |
386 | ||
8d717a52 | 387 | void __init bootmem_init(void) |
1da177e4 | 388 | { |
dde5828f | 389 | unsigned long min, max_low, max_high; |
1da177e4 | 390 | |
dde5828f RK |
391 | max_low = max_high = 0; |
392 | ||
f25b4b4c | 393 | find_limits(&min, &max_low, &max_high); |
dde5828f | 394 | |
a801d276 | 395 | arm_bootmem_init(min, max_low); |
dde5828f | 396 | |
be370302 RK |
397 | /* |
398 | * Sparsemem tries to allocate bootmem in memory_present(), | |
399 | * so must be done after the fixed reservations | |
400 | */ | |
eda2e5dc | 401 | arm_memory_present(); |
1da177e4 | 402 | |
b7a69ac3 RK |
403 | /* |
404 | * sparse_init() needs the bootmem allocator up and running. | |
405 | */ | |
406 | sparse_init(); | |
407 | ||
408 | /* | |
be370302 | 409 | * Now free the memory - free_area_init_node needs |
b7a69ac3 RK |
410 | * the sparse mem_map arrays initialized by sparse_init() |
411 | * for memmap_init_zone(), otherwise all PFNs are invalid. | |
412 | */ | |
a2c54d2a | 413 | arm_bootmem_free(min, max_low, max_high); |
b7a69ac3 | 414 | |
90072059 RK |
415 | /* |
416 | * This doesn't seem to be used by the Linux memory manager any | |
417 | * more, but is used by ll_rw_block. If we can get rid of it, we | |
418 | * also get rid of some of the stuff above as well. | |
419 | * | |
420 | * Note: max_low_pfn and max_pfn reflect the number of _pages_ in | |
421 | * the system, not the maximum PFN. | |
422 | */ | |
dde5828f RK |
423 | max_low_pfn = max_low - PHYS_PFN_OFFSET; |
424 | max_pfn = max_high - PHYS_PFN_OFFSET; | |
90072059 | 425 | } |
1da177e4 | 426 | |
6db015e4 | 427 | static inline int free_area(unsigned long pfn, unsigned long end, char *s) |
1da177e4 | 428 | { |
6db015e4 | 429 | unsigned int pages = 0, size = (end - pfn) << (PAGE_SHIFT - 10); |
1da177e4 | 430 | |
6db015e4 NP |
431 | for (; pfn < end; pfn++) { |
432 | struct page *page = pfn_to_page(pfn); | |
1da177e4 | 433 | ClearPageReserved(page); |
7835e98b | 434 | init_page_count(page); |
6db015e4 NP |
435 | __free_page(page); |
436 | pages++; | |
1da177e4 LT |
437 | } |
438 | ||
439 | if (size && s) | |
440 | printk(KERN_INFO "Freeing %s memory: %dK\n", s, size); | |
6db015e4 NP |
441 | |
442 | return pages; | |
1da177e4 LT |
443 | } |
444 | ||
54d52573 SB |
445 | /* |
446 | * Poison init memory with an undefined instruction (ARM) or a branch to an | |
447 | * undefined instruction (Thumb). | |
448 | */ | |
449 | static inline void poison_init_mem(void *s, size_t count) | |
450 | { | |
451 | u32 *p = (u32 *)s; | |
bf912d99 | 452 | for (; count != 0; count -= 4) |
54d52573 SB |
453 | *p++ = 0xe7fddef0; |
454 | } | |
455 | ||
a013053d | 456 | static inline void |
be370302 | 457 | free_memmap(unsigned long start_pfn, unsigned long end_pfn) |
a013053d RK |
458 | { |
459 | struct page *start_pg, *end_pg; | |
460 | unsigned long pg, pgend; | |
461 | ||
462 | /* | |
463 | * Convert start_pfn/end_pfn to a struct page pointer. | |
464 | */ | |
3257f43d | 465 | start_pg = pfn_to_page(start_pfn - 1) + 1; |
9af386c8 | 466 | end_pg = pfn_to_page(end_pfn - 1) + 1; |
a013053d RK |
467 | |
468 | /* | |
469 | * Convert to physical addresses, and | |
470 | * round start upwards and end downwards. | |
471 | */ | |
cae6292b WD |
472 | pg = (unsigned long)PAGE_ALIGN(__pa(start_pg)); |
473 | pgend = (unsigned long)__pa(end_pg) & PAGE_MASK; | |
a013053d RK |
474 | |
475 | /* | |
476 | * If there are free pages between these, | |
477 | * free the section of the memmap array. | |
478 | */ | |
479 | if (pg < pgend) | |
be370302 | 480 | free_bootmem(pg, pgend - pg); |
a013053d RK |
481 | } |
482 | ||
483 | /* | |
484 | * The mem_map array can get very big. Free the unused area of the memory map. | |
485 | */ | |
be370302 | 486 | static void __init free_unused_memmap(struct meminfo *mi) |
a013053d RK |
487 | { |
488 | unsigned long bank_start, prev_bank_end = 0; | |
489 | unsigned int i; | |
490 | ||
491 | /* | |
3260e529 MB |
492 | * This relies on each bank being in address order. |
493 | * The banks are sorted previously in bootmem_init(). | |
a013053d | 494 | */ |
be370302 | 495 | for_each_bank(i, mi) { |
d2a38ef9 RK |
496 | struct membank *bank = &mi->bank[i]; |
497 | ||
498 | bank_start = bank_pfn_start(bank); | |
a013053d | 499 | |
9af386c8 WD |
500 | #ifdef CONFIG_SPARSEMEM |
501 | /* | |
502 | * Take care not to free memmap entries that don't exist | |
503 | * due to SPARSEMEM sections which aren't present. | |
504 | */ | |
505 | bank_start = min(bank_start, | |
506 | ALIGN(prev_bank_end, PAGES_PER_SECTION)); | |
002ea9ee LW |
507 | #else |
508 | /* | |
509 | * Align down here since the VM subsystem insists that the | |
510 | * memmap entries are valid from the bank start aligned to | |
511 | * MAX_ORDER_NR_PAGES. | |
512 | */ | |
513 | bank_start = round_down(bank_start, MAX_ORDER_NR_PAGES); | |
9af386c8 | 514 | #endif |
a013053d RK |
515 | /* |
516 | * If we had a previous bank, and there is a space | |
517 | * between the current bank and the previous, free it. | |
518 | */ | |
3260e529 | 519 | if (prev_bank_end && prev_bank_end < bank_start) |
be370302 | 520 | free_memmap(prev_bank_end, bank_start); |
a013053d | 521 | |
3260e529 MB |
522 | /* |
523 | * Align up here since the VM subsystem insists that the | |
524 | * memmap entries are valid from the bank end aligned to | |
525 | * MAX_ORDER_NR_PAGES. | |
526 | */ | |
527 | prev_bank_end = ALIGN(bank_pfn_end(bank), MAX_ORDER_NR_PAGES); | |
a013053d | 528 | } |
9af386c8 WD |
529 | |
530 | #ifdef CONFIG_SPARSEMEM | |
531 | if (!IS_ALIGNED(prev_bank_end, PAGES_PER_SECTION)) | |
532 | free_memmap(prev_bank_end, | |
533 | ALIGN(prev_bank_end, PAGES_PER_SECTION)); | |
534 | #endif | |
a013053d RK |
535 | } |
536 | ||
d0e775af RK |
537 | static void __init free_highpages(void) |
538 | { | |
539 | #ifdef CONFIG_HIGHMEM | |
df4f14c7 RK |
540 | unsigned long max_low = max_low_pfn + PHYS_PFN_OFFSET; |
541 | struct memblock_region *mem, *res; | |
d0e775af RK |
542 | |
543 | /* set highmem page free */ | |
df4f14c7 RK |
544 | for_each_memblock(memory, mem) { |
545 | unsigned long start = memblock_region_memory_base_pfn(mem); | |
546 | unsigned long end = memblock_region_memory_end_pfn(mem); | |
547 | ||
548 | /* Ignore complete lowmem entries */ | |
549 | if (end <= max_low) | |
550 | continue; | |
551 | ||
552 | /* Truncate partial highmem entries */ | |
553 | if (start < max_low) | |
554 | start = max_low; | |
555 | ||
556 | /* Find and exclude any reserved regions */ | |
557 | for_each_memblock(reserved, res) { | |
558 | unsigned long res_start, res_end; | |
559 | ||
560 | res_start = memblock_region_reserved_base_pfn(res); | |
561 | res_end = memblock_region_reserved_end_pfn(res); | |
562 | ||
563 | if (res_end < start) | |
564 | continue; | |
565 | if (res_start < start) | |
566 | res_start = start; | |
567 | if (res_start > end) | |
568 | res_start = end; | |
569 | if (res_end > end) | |
570 | res_end = end; | |
571 | if (res_start != start) | |
572 | totalhigh_pages += free_area(start, res_start, | |
573 | NULL); | |
574 | start = res_end; | |
575 | if (start == end) | |
576 | break; | |
577 | } | |
578 | ||
579 | /* And now free anything which remains */ | |
580 | if (start < end) | |
d0e775af RK |
581 | totalhigh_pages += free_area(start, end, NULL); |
582 | } | |
583 | totalram_pages += totalhigh_pages; | |
584 | #endif | |
585 | } | |
586 | ||
1da177e4 LT |
587 | /* |
588 | * mem_init() marks the free areas in the mem_map and tells us how much | |
589 | * memory is free. This is done after various parts of the system have | |
590 | * claimed their memory after the kernel image. | |
591 | */ | |
592 | void __init mem_init(void) | |
593 | { | |
db9ef1af | 594 | unsigned long reserved_pages, free_pages; |
47ea3c15 | 595 | struct memblock_region *reg; |
be370302 | 596 | int i; |
1dbd30e9 LW |
597 | #ifdef CONFIG_HAVE_TCM |
598 | /* These pointers are filled in on TCM detection */ | |
599 | extern u32 dtcm_end; | |
600 | extern u32 itcm_end; | |
601 | #endif | |
1da177e4 | 602 | |
3835f6cb | 603 | max_mapnr = pfn_to_page(max_pfn + PHYS_PFN_OFFSET) - mem_map; |
1da177e4 | 604 | |
1da177e4 | 605 | /* this will put all unused low memory onto the freelists */ |
be370302 | 606 | free_unused_memmap(&meminfo); |
a013053d | 607 | |
be370302 | 608 | totalram_pages += free_all_bootmem(); |
1da177e4 LT |
609 | |
610 | #ifdef CONFIG_SA1111 | |
611 | /* now that our DMA memory is actually so designated, we can free it */ | |
6db015e4 NP |
612 | totalram_pages += free_area(PHYS_PFN_OFFSET, |
613 | __phys_to_pfn(__pa(swapper_pg_dir)), NULL); | |
1da177e4 LT |
614 | #endif |
615 | ||
d0e775af | 616 | free_highpages(); |
3835f6cb | 617 | |
db9ef1af FB |
618 | reserved_pages = free_pages = 0; |
619 | ||
be370302 RK |
620 | for_each_bank(i, &meminfo) { |
621 | struct membank *bank = &meminfo.bank[i]; | |
622 | unsigned int pfn1, pfn2; | |
623 | struct page *page, *end; | |
624 | ||
625 | pfn1 = bank_pfn_start(bank); | |
626 | pfn2 = bank_pfn_end(bank); | |
627 | ||
628 | page = pfn_to_page(pfn1); | |
629 | end = pfn_to_page(pfn2 - 1) + 1; | |
630 | ||
631 | do { | |
632 | if (PageReserved(page)) | |
633 | reserved_pages++; | |
634 | else if (!page_count(page)) | |
635 | free_pages++; | |
636 | page++; | |
637 | } while (page < end); | |
db9ef1af FB |
638 | } |
639 | ||
1da177e4 LT |
640 | /* |
641 | * Since our memory may not be contiguous, calculate the | |
642 | * real number of pages we have in this system | |
643 | */ | |
644 | printk(KERN_INFO "Memory:"); | |
1da177e4 | 645 | num_physpages = 0; |
47ea3c15 RK |
646 | for_each_memblock(memory, reg) { |
647 | unsigned long pages = memblock_region_memory_end_pfn(reg) - | |
648 | memblock_region_memory_base_pfn(reg); | |
649 | num_physpages += pages; | |
650 | printk(" %ldMB", pages >> (20 - PAGE_SHIFT)); | |
1da177e4 | 651 | } |
1da177e4 | 652 | printk(" = %luMB total\n", num_physpages >> (20 - PAGE_SHIFT)); |
6db015e4 | 653 | |
db9ef1af FB |
654 | printk(KERN_NOTICE "Memory: %luk/%luk available, %luk reserved, %luK highmem\n", |
655 | nr_free_pages() << (PAGE_SHIFT-10), | |
656 | free_pages << (PAGE_SHIFT-10), | |
657 | reserved_pages << (PAGE_SHIFT-10), | |
4b529401 | 658 | totalhigh_pages << (PAGE_SHIFT-10)); |
1da177e4 | 659 | |
db9ef1af FB |
660 | #define MLK(b, t) b, t, ((t) - (b)) >> 10 |
661 | #define MLM(b, t) b, t, ((t) - (b)) >> 20 | |
662 | #define MLK_ROUNDUP(b, t) b, t, DIV_ROUND_UP(((t) - (b)), SZ_1K) | |
663 | ||
664 | printk(KERN_NOTICE "Virtual kernel memory layout:\n" | |
665 | " vector : 0x%08lx - 0x%08lx (%4ld kB)\n" | |
07d2a5c7 | 666 | #ifdef CONFIG_HAVE_TCM |
07d2a5c7 | 667 | " DTCM : 0x%08lx - 0x%08lx (%4ld kB)\n" |
07d2a5c7 | 668 | " ITCM : 0x%08lx - 0x%08lx (%4ld kB)\n" |
07d2a5c7 | 669 | #endif |
db9ef1af FB |
670 | " fixmap : 0x%08lx - 0x%08lx (%4ld kB)\n" |
671 | " vmalloc : 0x%08lx - 0x%08lx (%4ld MB)\n" | |
672 | " lowmem : 0x%08lx - 0x%08lx (%4ld MB)\n" | |
673 | #ifdef CONFIG_HIGHMEM | |
674 | " pkmap : 0x%08lx - 0x%08lx (%4ld MB)\n" | |
675 | #endif | |
d9277d51 | 676 | #ifdef CONFIG_MODULES |
db9ef1af | 677 | " modules : 0x%08lx - 0x%08lx (%4ld MB)\n" |
d9277d51 | 678 | #endif |
db9ef1af | 679 | " .text : 0x%p" " - 0x%p" " (%4d kB)\n" |
3835d69a | 680 | " .init : 0x%p" " - 0x%p" " (%4d kB)\n" |
45f6d7e0 RV |
681 | " .data : 0x%p" " - 0x%p" " (%4d kB)\n" |
682 | " .bss : 0x%p" " - 0x%p" " (%4d kB)\n", | |
db9ef1af FB |
683 | |
684 | MLK(UL(CONFIG_VECTORS_BASE), UL(CONFIG_VECTORS_BASE) + | |
685 | (PAGE_SIZE)), | |
07d2a5c7 | 686 | #ifdef CONFIG_HAVE_TCM |
1dbd30e9 LW |
687 | MLK(DTCM_OFFSET, (unsigned long) dtcm_end), |
688 | MLK(ITCM_OFFSET, (unsigned long) itcm_end), | |
07d2a5c7 | 689 | #endif |
db9ef1af | 690 | MLK(FIXADDR_START, FIXADDR_TOP), |
c931b4f6 | 691 | MLM(VMALLOC_START, VMALLOC_END), |
db9ef1af FB |
692 | MLM(PAGE_OFFSET, (unsigned long)high_memory), |
693 | #ifdef CONFIG_HIGHMEM | |
694 | MLM(PKMAP_BASE, (PKMAP_BASE) + (LAST_PKMAP) * | |
695 | (PAGE_SIZE)), | |
696 | #endif | |
d9277d51 | 697 | #ifdef CONFIG_MODULES |
db9ef1af | 698 | MLM(MODULES_VADDR, MODULES_END), |
d9277d51 | 699 | #endif |
db9ef1af | 700 | |
db9ef1af | 701 | MLK_ROUNDUP(_text, _etext), |
3835d69a | 702 | MLK_ROUNDUP(__init_begin, __init_end), |
45f6d7e0 RV |
703 | MLK_ROUNDUP(_sdata, _edata), |
704 | MLK_ROUNDUP(__bss_start, __bss_stop)); | |
db9ef1af FB |
705 | |
706 | #undef MLK | |
707 | #undef MLM | |
708 | #undef MLK_ROUNDUP | |
709 | ||
a1839272 FB |
710 | /* |
711 | * Check boundaries twice: Some fundamental inconsistencies can | |
712 | * be detected at build time already. | |
713 | */ | |
714 | #ifdef CONFIG_MMU | |
a1839272 FB |
715 | BUILD_BUG_ON(TASK_SIZE > MODULES_VADDR); |
716 | BUG_ON(TASK_SIZE > MODULES_VADDR); | |
717 | #endif | |
718 | ||
719 | #ifdef CONFIG_HIGHMEM | |
720 | BUILD_BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE > PAGE_OFFSET); | |
721 | BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE > PAGE_OFFSET); | |
722 | #endif | |
723 | ||
1da177e4 LT |
724 | if (PAGE_SIZE >= 16384 && num_physpages <= 128) { |
725 | extern int sysctl_overcommit_memory; | |
726 | /* | |
727 | * On a machine this small we won't get | |
728 | * anywhere without overcommit, so turn | |
729 | * it on by default. | |
730 | */ | |
731 | sysctl_overcommit_memory = OVERCOMMIT_ALWAYS; | |
732 | } | |
733 | } | |
734 | ||
735 | void free_initmem(void) | |
736 | { | |
bc581770 | 737 | #ifdef CONFIG_HAVE_TCM |
ea208f64 | 738 | extern char __tcm_start, __tcm_end; |
bc581770 | 739 | |
54d52573 | 740 | poison_init_mem(&__tcm_start, &__tcm_end - &__tcm_start); |
ea208f64 LW |
741 | totalram_pages += free_area(__phys_to_pfn(__pa(&__tcm_start)), |
742 | __phys_to_pfn(__pa(&__tcm_end)), | |
bc581770 LW |
743 | "TCM link"); |
744 | #endif | |
745 | ||
54d52573 | 746 | poison_init_mem(__init_begin, __init_end - __init_begin); |
6db015e4 | 747 | if (!machine_is_integrator() && !machine_is_cintegrator()) |
37efe642 RK |
748 | totalram_pages += free_area(__phys_to_pfn(__pa(__init_begin)), |
749 | __phys_to_pfn(__pa(__init_end)), | |
6db015e4 | 750 | "init"); |
1da177e4 LT |
751 | } |
752 | ||
753 | #ifdef CONFIG_BLK_DEV_INITRD | |
754 | ||
755 | static int keep_initrd; | |
756 | ||
757 | void free_initrd_mem(unsigned long start, unsigned long end) | |
758 | { | |
54d52573 SB |
759 | if (!keep_initrd) { |
760 | poison_init_mem((void *)start, PAGE_ALIGN(end) - start); | |
6db015e4 NP |
761 | totalram_pages += free_area(__phys_to_pfn(__pa(start)), |
762 | __phys_to_pfn(__pa(end)), | |
763 | "initrd"); | |
54d52573 | 764 | } |
1da177e4 LT |
765 | } |
766 | ||
767 | static int __init keepinitrd_setup(char *__unused) | |
768 | { | |
769 | keep_initrd = 1; | |
770 | return 1; | |
771 | } | |
772 | ||
773 | __setup("keepinitrd", keepinitrd_setup); | |
774 | #endif |