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> |
10bcdfb8 | 20 | #include <linux/of_reserved_mem.h> |
3835f6cb | 21 | #include <linux/highmem.h> |
5a0e3ad6 | 22 | #include <linux/gfp.h> |
2778f620 | 23 | #include <linux/memblock.h> |
c7909509 | 24 | #include <linux/dma-contiguous.h> |
158e8bfe | 25 | #include <linux/sizes.h> |
1da177e4 LT |
26 | |
27 | #include <asm/mach-types.h> | |
716a3dc2 | 28 | #include <asm/memblock.h> |
93c02ab4 | 29 | #include <asm/prom.h> |
37efe642 | 30 | #include <asm/sections.h> |
1da177e4 LT |
31 | #include <asm/setup.h> |
32 | #include <asm/tlb.h> | |
db9ef1af | 33 | #include <asm/fixmap.h> |
1da177e4 LT |
34 | |
35 | #include <asm/mach/arch.h> | |
36 | #include <asm/mach/map.h> | |
37 | ||
1b2e2b73 RK |
38 | #include "mm.h" |
39 | ||
de22cc6e | 40 | static phys_addr_t phys_initrd_start __initdata = 0; |
012d1f4a RK |
41 | static unsigned long phys_initrd_size __initdata = 0; |
42 | ||
2b0d8c25 | 43 | static int __init early_initrd(char *p) |
012d1f4a | 44 | { |
de22cc6e VA |
45 | phys_addr_t start; |
46 | unsigned long size; | |
2b0d8c25 | 47 | char *endp; |
012d1f4a | 48 | |
2b0d8c25 JK |
49 | start = memparse(p, &endp); |
50 | if (*endp == ',') { | |
51 | size = memparse(endp + 1, NULL); | |
012d1f4a RK |
52 | |
53 | phys_initrd_start = start; | |
54 | phys_initrd_size = size; | |
55 | } | |
2b0d8c25 | 56 | return 0; |
012d1f4a | 57 | } |
2b0d8c25 | 58 | early_param("initrd", early_initrd); |
012d1f4a RK |
59 | |
60 | static int __init parse_tag_initrd(const struct tag *tag) | |
61 | { | |
62 | printk(KERN_WARNING "ATAG_INITRD is deprecated; " | |
63 | "please update your bootloader.\n"); | |
64 | phys_initrd_start = __virt_to_phys(tag->u.initrd.start); | |
65 | phys_initrd_size = tag->u.initrd.size; | |
66 | return 0; | |
67 | } | |
68 | ||
69 | __tagtable(ATAG_INITRD, parse_tag_initrd); | |
70 | ||
71 | static int __init parse_tag_initrd2(const struct tag *tag) | |
72 | { | |
73 | phys_initrd_start = tag->u.initrd.start; | |
74 | phys_initrd_size = tag->u.initrd.size; | |
75 | return 0; | |
76 | } | |
77 | ||
78 | __tagtable(ATAG_INITRD2, parse_tag_initrd2); | |
1da177e4 | 79 | |
9eb8f674 | 80 | #ifdef CONFIG_OF_FLATTREE |
374d5c99 | 81 | void __init early_init_dt_setup_initrd_arch(u64 start, u64 end) |
9eb8f674 GL |
82 | { |
83 | phys_initrd_start = start; | |
84 | phys_initrd_size = end - start; | |
85 | } | |
86 | #endif /* CONFIG_OF_FLATTREE */ | |
87 | ||
1da177e4 | 88 | /* |
4b5f32ce NP |
89 | * This keeps memory configuration data used by a couple memory |
90 | * initialization functions, as well as show_mem() for the skipping | |
91 | * of holes in the memory map. It is populated by arm_add_memory(). | |
1da177e4 | 92 | */ |
4b5f32ce | 93 | struct meminfo meminfo; |
5e709827 | 94 | |
b2b755b5 | 95 | void show_mem(unsigned int filter) |
1da177e4 LT |
96 | { |
97 | int free = 0, total = 0, reserved = 0; | |
be370302 | 98 | int shared = 0, cached = 0, slab = 0, i; |
5e709827 | 99 | struct meminfo * mi = &meminfo; |
1da177e4 LT |
100 | |
101 | printk("Mem-info:\n"); | |
7bf02ea2 | 102 | show_free_areas(filter); |
be370302 | 103 | |
4b59e6c4 DR |
104 | if (filter & SHOW_MEM_FILTER_PAGE_COUNT) |
105 | return; | |
106 | ||
be370302 RK |
107 | for_each_bank (i, mi) { |
108 | struct membank *bank = &mi->bank[i]; | |
109 | unsigned int pfn1, pfn2; | |
110 | struct page *page, *end; | |
111 | ||
112 | pfn1 = bank_pfn_start(bank); | |
113 | pfn2 = bank_pfn_end(bank); | |
114 | ||
115 | page = pfn_to_page(pfn1); | |
116 | end = pfn_to_page(pfn2 - 1) + 1; | |
117 | ||
118 | do { | |
119 | total++; | |
120 | if (PageReserved(page)) | |
121 | reserved++; | |
122 | else if (PageSwapCache(page)) | |
123 | cached++; | |
124 | else if (PageSlab(page)) | |
125 | slab++; | |
126 | else if (!page_count(page)) | |
127 | free++; | |
128 | else | |
129 | shared += page_count(page) - 1; | |
130 | page++; | |
131 | } while (page < end); | |
1da177e4 LT |
132 | } |
133 | ||
134 | printk("%d pages of RAM\n", total); | |
135 | printk("%d free pages\n", free); | |
136 | printk("%d reserved pages\n", reserved); | |
137 | printk("%d slab pages\n", slab); | |
138 | printk("%d pages shared\n", shared); | |
139 | printk("%d pages swap cached\n", cached); | |
140 | } | |
141 | ||
f25b4b4c | 142 | static void __init find_limits(unsigned long *min, unsigned long *max_low, |
27a3f0e9 | 143 | unsigned long *max_high) |
dde5828f | 144 | { |
f25b4b4c | 145 | struct meminfo *mi = &meminfo; |
dde5828f RK |
146 | int i; |
147 | ||
27a3f0e9 NP |
148 | /* This assumes the meminfo array is properly sorted */ |
149 | *min = bank_pfn_start(&mi->bank[0]); | |
150 | for_each_bank (i, mi) | |
151 | if (mi->bank[i].highmem) | |
152 | break; | |
153 | *max_low = bank_pfn_end(&mi->bank[i - 1]); | |
154 | *max_high = bank_pfn_end(&mi->bank[mi->nr_banks - 1]); | |
dde5828f RK |
155 | } |
156 | ||
a801d276 RK |
157 | static void __init arm_bootmem_init(unsigned long start_pfn, |
158 | unsigned long end_pfn) | |
1da177e4 | 159 | { |
719c1514 | 160 | struct memblock_region *reg; |
90072059 | 161 | unsigned int boot_pages; |
2778f620 | 162 | phys_addr_t bitmap; |
90072059 | 163 | pg_data_t *pgdat; |
1da177e4 | 164 | |
90072059 | 165 | /* |
2778f620 RK |
166 | * Allocate the bootmem bitmap page. This must be in a region |
167 | * of memory which has already been mapped. | |
90072059 RK |
168 | */ |
169 | boot_pages = bootmem_bootmap_pages(end_pfn - start_pfn); | |
2778f620 RK |
170 | bitmap = memblock_alloc_base(boot_pages << PAGE_SHIFT, L1_CACHE_BYTES, |
171 | __pfn_to_phys(end_pfn)); | |
1da177e4 | 172 | |
90072059 | 173 | /* |
be370302 | 174 | * Initialise the bootmem allocator, handing the |
90072059 RK |
175 | * memory banks over to bootmem. |
176 | */ | |
be370302 RK |
177 | node_set_online(0); |
178 | pgdat = NODE_DATA(0); | |
2778f620 | 179 | init_bootmem_node(pgdat, __phys_to_pfn(bitmap), start_pfn, end_pfn); |
1da177e4 | 180 | |
a801d276 RK |
181 | /* Free the lowmem regions from memblock into bootmem. */ |
182 | for_each_memblock(memory, reg) { | |
183 | unsigned long start = memblock_region_memory_base_pfn(reg); | |
184 | unsigned long end = memblock_region_memory_end_pfn(reg); | |
185 | ||
186 | if (end >= end_pfn) | |
187 | end = end_pfn; | |
188 | if (start >= end) | |
189 | break; | |
190 | ||
191 | free_bootmem(__pfn_to_phys(start), (end - start) << PAGE_SHIFT); | |
d2a38ef9 | 192 | } |
90072059 | 193 | |
a801d276 | 194 | /* Reserve the lowmem memblock reserved regions in bootmem. */ |
719c1514 | 195 | for_each_memblock(reserved, reg) { |
a801d276 RK |
196 | unsigned long start = memblock_region_reserved_base_pfn(reg); |
197 | unsigned long end = memblock_region_reserved_end_pfn(reg); | |
198 | ||
199 | if (end >= end_pfn) | |
200 | end = end_pfn; | |
201 | if (start >= end) | |
202 | break; | |
203 | ||
204 | reserve_bootmem(__pfn_to_phys(start), | |
205 | (end - start) << PAGE_SHIFT, BOOTMEM_DEFAULT); | |
1da177e4 | 206 | } |
b7a69ac3 RK |
207 | } |
208 | ||
be20902b | 209 | #ifdef CONFIG_ZONE_DMA |
65032018 | 210 | |
364230b9 | 211 | phys_addr_t arm_dma_zone_size __read_mostly; |
65032018 NP |
212 | EXPORT_SYMBOL(arm_dma_zone_size); |
213 | ||
022ae537 RK |
214 | /* |
215 | * The DMA mask corresponding to the maximum bus address allocatable | |
216 | * using GFP_DMA. The default here places no restriction on DMA | |
217 | * allocations. This must be the smallest DMA mask in the system, | |
218 | * so a successful GFP_DMA allocation will always satisfy this. | |
219 | */ | |
4986e5c7 | 220 | phys_addr_t arm_dma_limit; |
4dcfa600 | 221 | unsigned long arm_dma_pfn_limit; |
022ae537 | 222 | |
be20902b RK |
223 | static void __init arm_adjust_dma_zone(unsigned long *size, unsigned long *hole, |
224 | unsigned long dma_size) | |
225 | { | |
226 | if (size[0] <= dma_size) | |
227 | return; | |
228 | ||
229 | size[ZONE_NORMAL] = size[0] - dma_size; | |
230 | size[ZONE_DMA] = dma_size; | |
231 | hole[ZONE_NORMAL] = hole[0]; | |
232 | hole[ZONE_DMA] = 0; | |
233 | } | |
234 | #endif | |
235 | ||
ff69a4c8 | 236 | void __init setup_dma_zone(const struct machine_desc *mdesc) |
c7909509 MS |
237 | { |
238 | #ifdef CONFIG_ZONE_DMA | |
239 | if (mdesc->dma_zone_size) { | |
240 | arm_dma_zone_size = mdesc->dma_zone_size; | |
241 | arm_dma_limit = PHYS_OFFSET + arm_dma_zone_size - 1; | |
242 | } else | |
243 | arm_dma_limit = 0xffffffff; | |
4dcfa600 | 244 | arm_dma_pfn_limit = arm_dma_limit >> PAGE_SHIFT; |
c7909509 MS |
245 | #endif |
246 | } | |
247 | ||
a2c54d2a RK |
248 | static void __init arm_bootmem_free(unsigned long min, unsigned long max_low, |
249 | unsigned long max_high) | |
b7a69ac3 RK |
250 | { |
251 | unsigned long zone_size[MAX_NR_ZONES], zhole_size[MAX_NR_ZONES]; | |
a2c54d2a | 252 | struct memblock_region *reg; |
b7a69ac3 | 253 | |
90072059 | 254 | /* |
be370302 | 255 | * initialise the zones. |
90072059 RK |
256 | */ |
257 | memset(zone_size, 0, sizeof(zone_size)); | |
90072059 RK |
258 | |
259 | /* | |
be370302 RK |
260 | * The memory size has already been determined. If we need |
261 | * to do anything fancy with the allocation of this memory | |
262 | * to the zones, now is the time to do it. | |
90072059 | 263 | */ |
dde5828f RK |
264 | zone_size[0] = max_low - min; |
265 | #ifdef CONFIG_HIGHMEM | |
266 | zone_size[ZONE_HIGHMEM] = max_high - max_low; | |
267 | #endif | |
90072059 RK |
268 | |
269 | /* | |
be370302 RK |
270 | * Calculate the size of the holes. |
271 | * holes = node_size - sum(bank_sizes) | |
90072059 | 272 | */ |
dde5828f | 273 | memcpy(zhole_size, zone_size, sizeof(zhole_size)); |
a2c54d2a RK |
274 | for_each_memblock(memory, reg) { |
275 | unsigned long start = memblock_region_memory_base_pfn(reg); | |
276 | unsigned long end = memblock_region_memory_end_pfn(reg); | |
277 | ||
278 | if (start < max_low) { | |
279 | unsigned long low_end = min(end, max_low); | |
280 | zhole_size[0] -= low_end - start; | |
281 | } | |
dde5828f | 282 | #ifdef CONFIG_HIGHMEM |
a2c54d2a RK |
283 | if (end > max_low) { |
284 | unsigned long high_start = max(start, max_low); | |
285 | zhole_size[ZONE_HIGHMEM] -= end - high_start; | |
286 | } | |
dde5828f | 287 | #endif |
dde5828f | 288 | } |
90072059 | 289 | |
65032018 | 290 | #ifdef CONFIG_ZONE_DMA |
90072059 RK |
291 | /* |
292 | * Adjust the sizes according to any special requirements for | |
293 | * this machine type. | |
294 | */ | |
c7909509 | 295 | if (arm_dma_zone_size) |
65032018 NP |
296 | arm_adjust_dma_zone(zone_size, zhole_size, |
297 | arm_dma_zone_size >> PAGE_SHIFT); | |
be20902b | 298 | #endif |
90072059 | 299 | |
be370302 | 300 | free_area_init_node(0, zone_size, min, zhole_size); |
1da177e4 LT |
301 | } |
302 | ||
7b7bf499 | 303 | #ifdef CONFIG_HAVE_ARCH_PFN_VALID |
b7cfda9f RK |
304 | int pfn_valid(unsigned long pfn) |
305 | { | |
fb492c91 | 306 | return memblock_is_memory(__pfn_to_phys(pfn)); |
b7cfda9f RK |
307 | } |
308 | EXPORT_SYMBOL(pfn_valid); | |
7b7bf499 | 309 | #endif |
657e12fd | 310 | |
7b7bf499 | 311 | #ifndef CONFIG_SPARSEMEM |
14904927 | 312 | static void __init arm_memory_present(void) |
657e12fd RK |
313 | { |
314 | } | |
315 | #else | |
14904927 | 316 | static void __init arm_memory_present(void) |
657e12fd | 317 | { |
719c1514 | 318 | struct memblock_region *reg; |
719c1514 | 319 | |
7c996361 | 320 | for_each_memblock(memory, reg) |
c7fc2de0 YL |
321 | memory_present(0, memblock_region_memory_base_pfn(reg), |
322 | memblock_region_memory_end_pfn(reg)); | |
657e12fd | 323 | } |
b7cfda9f RK |
324 | #endif |
325 | ||
716a3dc2 RK |
326 | static bool arm_memblock_steal_permitted = true; |
327 | ||
bc2827d0 | 328 | phys_addr_t __init arm_memblock_steal(phys_addr_t size, phys_addr_t align) |
716a3dc2 RK |
329 | { |
330 | phys_addr_t phys; | |
331 | ||
332 | BUG_ON(!arm_memblock_steal_permitted); | |
333 | ||
7ac68a4c | 334 | phys = memblock_alloc_base(size, align, MEMBLOCK_ALLOC_ANYWHERE); |
716a3dc2 RK |
335 | memblock_free(phys, size); |
336 | memblock_remove(phys, size); | |
337 | ||
338 | return phys; | |
339 | } | |
340 | ||
ff69a4c8 RK |
341 | void __init arm_memblock_init(struct meminfo *mi, |
342 | const struct machine_desc *mdesc) | |
2778f620 RK |
343 | { |
344 | int i; | |
345 | ||
2778f620 RK |
346 | for (i = 0; i < mi->nr_banks; i++) |
347 | memblock_add(mi->bank[i].start, mi->bank[i].size); | |
348 | ||
349 | /* Register the kernel text, kernel data and initrd with memblock. */ | |
350 | #ifdef CONFIG_XIP_KERNEL | |
842eab40 | 351 | memblock_reserve(__pa(_sdata), _end - _sdata); |
2778f620 RK |
352 | #else |
353 | memblock_reserve(__pa(_stext), _end - _stext); | |
354 | #endif | |
355 | #ifdef CONFIG_BLK_DEV_INITRD | |
8f4b8c76 RK |
356 | if (phys_initrd_size && |
357 | !memblock_is_region_memory(phys_initrd_start, phys_initrd_size)) { | |
de22cc6e VA |
358 | pr_err("INITRD: 0x%08llx+0x%08lx is not a memory region - disabling initrd\n", |
359 | (u64)phys_initrd_start, phys_initrd_size); | |
8f4b8c76 RK |
360 | phys_initrd_start = phys_initrd_size = 0; |
361 | } | |
b0a2679d RK |
362 | if (phys_initrd_size && |
363 | memblock_is_region_reserved(phys_initrd_start, phys_initrd_size)) { | |
de22cc6e VA |
364 | pr_err("INITRD: 0x%08llx+0x%08lx overlaps in-use memory region - disabling initrd\n", |
365 | (u64)phys_initrd_start, phys_initrd_size); | |
b0a2679d RK |
366 | phys_initrd_start = phys_initrd_size = 0; |
367 | } | |
2778f620 RK |
368 | if (phys_initrd_size) { |
369 | memblock_reserve(phys_initrd_start, phys_initrd_size); | |
370 | ||
371 | /* Now convert initrd to virtual addresses */ | |
372 | initrd_start = __phys_to_virt(phys_initrd_start); | |
373 | initrd_end = initrd_start + phys_initrd_size; | |
374 | } | |
375 | #endif | |
376 | ||
377 | arm_mm_memblock_reserve(); | |
93c02ab4 | 378 | arm_dt_memblock_reserve(); |
2778f620 | 379 | |
8d717a52 RK |
380 | /* reserve any platform specific memblock areas */ |
381 | if (mdesc->reserve) | |
382 | mdesc->reserve(); | |
383 | ||
10bcdfb8 MS |
384 | early_init_dt_scan_reserved_mem(); |
385 | ||
c7909509 MS |
386 | /* |
387 | * reserve memory for DMA contigouos allocations, | |
388 | * must come from DMA area inside low memory | |
389 | */ | |
390 | dma_contiguous_reserve(min(arm_dma_limit, arm_lowmem_limit)); | |
391 | ||
716a3dc2 | 392 | arm_memblock_steal_permitted = false; |
1aadc056 | 393 | memblock_allow_resize(); |
2778f620 RK |
394 | memblock_dump_all(); |
395 | } | |
396 | ||
8d717a52 | 397 | void __init bootmem_init(void) |
1da177e4 | 398 | { |
dde5828f | 399 | unsigned long min, max_low, max_high; |
1da177e4 | 400 | |
dde5828f RK |
401 | max_low = max_high = 0; |
402 | ||
f25b4b4c | 403 | find_limits(&min, &max_low, &max_high); |
dde5828f | 404 | |
a801d276 | 405 | arm_bootmem_init(min, max_low); |
dde5828f | 406 | |
be370302 RK |
407 | /* |
408 | * Sparsemem tries to allocate bootmem in memory_present(), | |
409 | * so must be done after the fixed reservations | |
410 | */ | |
eda2e5dc | 411 | arm_memory_present(); |
1da177e4 | 412 | |
b7a69ac3 RK |
413 | /* |
414 | * sparse_init() needs the bootmem allocator up and running. | |
415 | */ | |
416 | sparse_init(); | |
417 | ||
418 | /* | |
be370302 | 419 | * Now free the memory - free_area_init_node needs |
b7a69ac3 RK |
420 | * the sparse mem_map arrays initialized by sparse_init() |
421 | * for memmap_init_zone(), otherwise all PFNs are invalid. | |
422 | */ | |
a2c54d2a | 423 | arm_bootmem_free(min, max_low, max_high); |
b7a69ac3 | 424 | |
90072059 RK |
425 | /* |
426 | * This doesn't seem to be used by the Linux memory manager any | |
427 | * more, but is used by ll_rw_block. If we can get rid of it, we | |
428 | * also get rid of some of the stuff above as well. | |
429 | * | |
430 | * Note: max_low_pfn and max_pfn reflect the number of _pages_ in | |
431 | * the system, not the maximum PFN. | |
432 | */ | |
dde5828f RK |
433 | max_low_pfn = max_low - PHYS_PFN_OFFSET; |
434 | max_pfn = max_high - PHYS_PFN_OFFSET; | |
90072059 | 435 | } |
1da177e4 | 436 | |
54d52573 SB |
437 | /* |
438 | * Poison init memory with an undefined instruction (ARM) or a branch to an | |
439 | * undefined instruction (Thumb). | |
440 | */ | |
441 | static inline void poison_init_mem(void *s, size_t count) | |
442 | { | |
443 | u32 *p = (u32 *)s; | |
bf912d99 | 444 | for (; count != 0; count -= 4) |
54d52573 SB |
445 | *p++ = 0xe7fddef0; |
446 | } | |
447 | ||
a013053d | 448 | static inline void |
be370302 | 449 | free_memmap(unsigned long start_pfn, unsigned long end_pfn) |
a013053d RK |
450 | { |
451 | struct page *start_pg, *end_pg; | |
56bc6286 | 452 | phys_addr_t pg, pgend; |
a013053d RK |
453 | |
454 | /* | |
455 | * Convert start_pfn/end_pfn to a struct page pointer. | |
456 | */ | |
3257f43d | 457 | start_pg = pfn_to_page(start_pfn - 1) + 1; |
9af386c8 | 458 | end_pg = pfn_to_page(end_pfn - 1) + 1; |
a013053d RK |
459 | |
460 | /* | |
461 | * Convert to physical addresses, and | |
462 | * round start upwards and end downwards. | |
463 | */ | |
56bc6286 VA |
464 | pg = PAGE_ALIGN(__pa(start_pg)); |
465 | pgend = __pa(end_pg) & PAGE_MASK; | |
a013053d RK |
466 | |
467 | /* | |
468 | * If there are free pages between these, | |
469 | * free the section of the memmap array. | |
470 | */ | |
471 | if (pg < pgend) | |
be370302 | 472 | free_bootmem(pg, pgend - pg); |
a013053d RK |
473 | } |
474 | ||
475 | /* | |
476 | * The mem_map array can get very big. Free the unused area of the memory map. | |
477 | */ | |
be370302 | 478 | static void __init free_unused_memmap(struct meminfo *mi) |
a013053d RK |
479 | { |
480 | unsigned long bank_start, prev_bank_end = 0; | |
481 | unsigned int i; | |
482 | ||
483 | /* | |
3260e529 MB |
484 | * This relies on each bank being in address order. |
485 | * The banks are sorted previously in bootmem_init(). | |
a013053d | 486 | */ |
be370302 | 487 | for_each_bank(i, mi) { |
d2a38ef9 RK |
488 | struct membank *bank = &mi->bank[i]; |
489 | ||
490 | bank_start = bank_pfn_start(bank); | |
a013053d | 491 | |
9af386c8 WD |
492 | #ifdef CONFIG_SPARSEMEM |
493 | /* | |
494 | * Take care not to free memmap entries that don't exist | |
495 | * due to SPARSEMEM sections which aren't present. | |
496 | */ | |
497 | bank_start = min(bank_start, | |
498 | ALIGN(prev_bank_end, PAGES_PER_SECTION)); | |
002ea9ee LW |
499 | #else |
500 | /* | |
501 | * Align down here since the VM subsystem insists that the | |
502 | * memmap entries are valid from the bank start aligned to | |
503 | * MAX_ORDER_NR_PAGES. | |
504 | */ | |
505 | bank_start = round_down(bank_start, MAX_ORDER_NR_PAGES); | |
9af386c8 | 506 | #endif |
a013053d RK |
507 | /* |
508 | * If we had a previous bank, and there is a space | |
509 | * between the current bank and the previous, free it. | |
510 | */ | |
3260e529 | 511 | if (prev_bank_end && prev_bank_end < bank_start) |
be370302 | 512 | free_memmap(prev_bank_end, bank_start); |
a013053d | 513 | |
3260e529 MB |
514 | /* |
515 | * Align up here since the VM subsystem insists that the | |
516 | * memmap entries are valid from the bank end aligned to | |
517 | * MAX_ORDER_NR_PAGES. | |
518 | */ | |
519 | prev_bank_end = ALIGN(bank_pfn_end(bank), MAX_ORDER_NR_PAGES); | |
a013053d | 520 | } |
9af386c8 WD |
521 | |
522 | #ifdef CONFIG_SPARSEMEM | |
523 | if (!IS_ALIGNED(prev_bank_end, PAGES_PER_SECTION)) | |
524 | free_memmap(prev_bank_end, | |
525 | ALIGN(prev_bank_end, PAGES_PER_SECTION)); | |
526 | #endif | |
a013053d RK |
527 | } |
528 | ||
83db0384 JL |
529 | #ifdef CONFIG_HIGHMEM |
530 | static inline void free_area_high(unsigned long pfn, unsigned long end) | |
531 | { | |
dd6911ef JL |
532 | for (; pfn < end; pfn++) |
533 | free_highmem_page(pfn_to_page(pfn)); | |
83db0384 JL |
534 | } |
535 | #endif | |
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) | |
83db0384 | 572 | free_area_high(start, res_start); |
df4f14c7 RK |
573 | start = res_end; |
574 | if (start == end) | |
575 | break; | |
576 | } | |
577 | ||
578 | /* And now free anything which remains */ | |
579 | if (start < end) | |
83db0384 | 580 | free_area_high(start, end); |
d0e775af | 581 | } |
d0e775af RK |
582 | #endif |
583 | } | |
584 | ||
1da177e4 LT |
585 | /* |
586 | * mem_init() marks the free areas in the mem_map and tells us how much | |
587 | * memory is free. This is done after various parts of the system have | |
588 | * claimed their memory after the kernel image. | |
589 | */ | |
590 | void __init mem_init(void) | |
591 | { | |
1dbd30e9 LW |
592 | #ifdef CONFIG_HAVE_TCM |
593 | /* These pointers are filled in on TCM detection */ | |
594 | extern u32 dtcm_end; | |
595 | extern u32 itcm_end; | |
596 | #endif | |
1da177e4 | 597 | |
3835f6cb | 598 | max_mapnr = pfn_to_page(max_pfn + PHYS_PFN_OFFSET) - mem_map; |
1da177e4 | 599 | |
1da177e4 | 600 | /* this will put all unused low memory onto the freelists */ |
be370302 | 601 | free_unused_memmap(&meminfo); |
0c988534 | 602 | free_all_bootmem(); |
1da177e4 LT |
603 | |
604 | #ifdef CONFIG_SA1111 | |
605 | /* now that our DMA memory is actually so designated, we can free it */ | |
bfd65dd9 | 606 | free_reserved_area(__va(PHYS_OFFSET), swapper_pg_dir, -1, NULL); |
1da177e4 LT |
607 | #endif |
608 | ||
d0e775af | 609 | free_highpages(); |
3835f6cb | 610 | |
2450c973 | 611 | mem_init_print_info(NULL); |
1da177e4 | 612 | |
db9ef1af FB |
613 | #define MLK(b, t) b, t, ((t) - (b)) >> 10 |
614 | #define MLM(b, t) b, t, ((t) - (b)) >> 20 | |
615 | #define MLK_ROUNDUP(b, t) b, t, DIV_ROUND_UP(((t) - (b)), SZ_1K) | |
616 | ||
617 | printk(KERN_NOTICE "Virtual kernel memory layout:\n" | |
618 | " vector : 0x%08lx - 0x%08lx (%4ld kB)\n" | |
07d2a5c7 | 619 | #ifdef CONFIG_HAVE_TCM |
07d2a5c7 | 620 | " DTCM : 0x%08lx - 0x%08lx (%4ld kB)\n" |
07d2a5c7 | 621 | " ITCM : 0x%08lx - 0x%08lx (%4ld kB)\n" |
07d2a5c7 | 622 | #endif |
db9ef1af FB |
623 | " fixmap : 0x%08lx - 0x%08lx (%4ld kB)\n" |
624 | " vmalloc : 0x%08lx - 0x%08lx (%4ld MB)\n" | |
625 | " lowmem : 0x%08lx - 0x%08lx (%4ld MB)\n" | |
626 | #ifdef CONFIG_HIGHMEM | |
627 | " pkmap : 0x%08lx - 0x%08lx (%4ld MB)\n" | |
628 | #endif | |
d9277d51 | 629 | #ifdef CONFIG_MODULES |
db9ef1af | 630 | " modules : 0x%08lx - 0x%08lx (%4ld MB)\n" |
d9277d51 | 631 | #endif |
db9ef1af | 632 | " .text : 0x%p" " - 0x%p" " (%4d kB)\n" |
3835d69a | 633 | " .init : 0x%p" " - 0x%p" " (%4d kB)\n" |
45f6d7e0 RV |
634 | " .data : 0x%p" " - 0x%p" " (%4d kB)\n" |
635 | " .bss : 0x%p" " - 0x%p" " (%4d kB)\n", | |
db9ef1af FB |
636 | |
637 | MLK(UL(CONFIG_VECTORS_BASE), UL(CONFIG_VECTORS_BASE) + | |
638 | (PAGE_SIZE)), | |
07d2a5c7 | 639 | #ifdef CONFIG_HAVE_TCM |
1dbd30e9 LW |
640 | MLK(DTCM_OFFSET, (unsigned long) dtcm_end), |
641 | MLK(ITCM_OFFSET, (unsigned long) itcm_end), | |
07d2a5c7 | 642 | #endif |
db9ef1af | 643 | MLK(FIXADDR_START, FIXADDR_TOP), |
c931b4f6 | 644 | MLM(VMALLOC_START, VMALLOC_END), |
db9ef1af FB |
645 | MLM(PAGE_OFFSET, (unsigned long)high_memory), |
646 | #ifdef CONFIG_HIGHMEM | |
647 | MLM(PKMAP_BASE, (PKMAP_BASE) + (LAST_PKMAP) * | |
648 | (PAGE_SIZE)), | |
649 | #endif | |
d9277d51 | 650 | #ifdef CONFIG_MODULES |
db9ef1af | 651 | MLM(MODULES_VADDR, MODULES_END), |
d9277d51 | 652 | #endif |
db9ef1af | 653 | |
db9ef1af | 654 | MLK_ROUNDUP(_text, _etext), |
3835d69a | 655 | MLK_ROUNDUP(__init_begin, __init_end), |
45f6d7e0 RV |
656 | MLK_ROUNDUP(_sdata, _edata), |
657 | MLK_ROUNDUP(__bss_start, __bss_stop)); | |
db9ef1af FB |
658 | |
659 | #undef MLK | |
660 | #undef MLM | |
661 | #undef MLK_ROUNDUP | |
662 | ||
a1839272 FB |
663 | /* |
664 | * Check boundaries twice: Some fundamental inconsistencies can | |
665 | * be detected at build time already. | |
666 | */ | |
667 | #ifdef CONFIG_MMU | |
a1839272 FB |
668 | BUILD_BUG_ON(TASK_SIZE > MODULES_VADDR); |
669 | BUG_ON(TASK_SIZE > MODULES_VADDR); | |
670 | #endif | |
671 | ||
672 | #ifdef CONFIG_HIGHMEM | |
673 | BUILD_BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE > PAGE_OFFSET); | |
674 | BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE > PAGE_OFFSET); | |
675 | #endif | |
676 | ||
2450c973 | 677 | if (PAGE_SIZE >= 16384 && get_num_physpages() <= 128) { |
1da177e4 LT |
678 | extern int sysctl_overcommit_memory; |
679 | /* | |
680 | * On a machine this small we won't get | |
681 | * anywhere without overcommit, so turn | |
682 | * it on by default. | |
683 | */ | |
684 | sysctl_overcommit_memory = OVERCOMMIT_ALWAYS; | |
685 | } | |
686 | } | |
687 | ||
688 | void free_initmem(void) | |
689 | { | |
bc581770 | 690 | #ifdef CONFIG_HAVE_TCM |
ea208f64 | 691 | extern char __tcm_start, __tcm_end; |
bc581770 | 692 | |
54d52573 | 693 | poison_init_mem(&__tcm_start, &__tcm_end - &__tcm_start); |
dbe67df4 | 694 | free_reserved_area(&__tcm_start, &__tcm_end, -1, "TCM link"); |
bc581770 LW |
695 | #endif |
696 | ||
54d52573 | 697 | poison_init_mem(__init_begin, __init_end - __init_begin); |
6db015e4 | 698 | if (!machine_is_integrator() && !machine_is_cintegrator()) |
dbe67df4 | 699 | free_initmem_default(-1); |
1da177e4 LT |
700 | } |
701 | ||
702 | #ifdef CONFIG_BLK_DEV_INITRD | |
703 | ||
704 | static int keep_initrd; | |
705 | ||
706 | void free_initrd_mem(unsigned long start, unsigned long end) | |
707 | { | |
54d52573 SB |
708 | if (!keep_initrd) { |
709 | poison_init_mem((void *)start, PAGE_ALIGN(end) - start); | |
dbe67df4 | 710 | free_reserved_area((void *)start, (void *)end, -1, "initrd"); |
54d52573 | 711 | } |
1da177e4 LT |
712 | } |
713 | ||
714 | static int __init keepinitrd_setup(char *__unused) | |
715 | { | |
716 | keep_initrd = 1; | |
717 | return 1; | |
718 | } | |
719 | ||
720 | __setup("keepinitrd", keepinitrd_setup); | |
721 | #endif |