Commit | Line | Data |
---|---|---|
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> |
1da177e4 LT |
23 | |
24 | #include <asm/mach-types.h> | |
93c02ab4 | 25 | #include <asm/prom.h> |
37efe642 | 26 | #include <asm/sections.h> |
1da177e4 | 27 | #include <asm/setup.h> |
74d02fb9 | 28 | #include <asm/sizes.h> |
1da177e4 | 29 | #include <asm/tlb.h> |
db9ef1af | 30 | #include <asm/fixmap.h> |
1da177e4 LT |
31 | |
32 | #include <asm/mach/arch.h> | |
33 | #include <asm/mach/map.h> | |
1c16d242 | 34 | #include <asm/memblock.h> |
1da177e4 | 35 | |
1b2e2b73 RK |
36 | #include "mm.h" |
37 | ||
012d1f4a RK |
38 | static unsigned long phys_initrd_start __initdata = 0; |
39 | static unsigned long phys_initrd_size __initdata = 0; | |
40 | ||
2b0d8c25 | 41 | static int __init early_initrd(char *p) |
012d1f4a RK |
42 | { |
43 | unsigned long start, size; | |
2b0d8c25 | 44 | char *endp; |
012d1f4a | 45 | |
2b0d8c25 JK |
46 | start = memparse(p, &endp); |
47 | if (*endp == ',') { | |
48 | size = memparse(endp + 1, NULL); | |
012d1f4a RK |
49 | |
50 | phys_initrd_start = start; | |
51 | phys_initrd_size = size; | |
52 | } | |
2b0d8c25 | 53 | return 0; |
012d1f4a | 54 | } |
2b0d8c25 | 55 | early_param("initrd", early_initrd); |
012d1f4a RK |
56 | |
57 | static int __init parse_tag_initrd(const struct tag *tag) | |
58 | { | |
59 | printk(KERN_WARNING "ATAG_INITRD is deprecated; " | |
60 | "please update your bootloader.\n"); | |
61 | phys_initrd_start = __virt_to_phys(tag->u.initrd.start); | |
62 | phys_initrd_size = tag->u.initrd.size; | |
63 | return 0; | |
64 | } | |
65 | ||
66 | __tagtable(ATAG_INITRD, parse_tag_initrd); | |
67 | ||
68 | static int __init parse_tag_initrd2(const struct tag *tag) | |
69 | { | |
70 | phys_initrd_start = tag->u.initrd.start; | |
71 | phys_initrd_size = tag->u.initrd.size; | |
72 | return 0; | |
73 | } | |
74 | ||
75 | __tagtable(ATAG_INITRD2, parse_tag_initrd2); | |
1da177e4 | 76 | |
9eb8f674 GL |
77 | #ifdef CONFIG_OF_FLATTREE |
78 | void __init early_init_dt_setup_initrd_arch(unsigned long start, unsigned long end) | |
79 | { | |
80 | phys_initrd_start = start; | |
81 | phys_initrd_size = end - start; | |
82 | } | |
83 | #endif /* CONFIG_OF_FLATTREE */ | |
84 | ||
1da177e4 | 85 | /* |
4b5f32ce NP |
86 | * This keeps memory configuration data used by a couple memory |
87 | * initialization functions, as well as show_mem() for the skipping | |
88 | * of holes in the memory map. It is populated by arm_add_memory(). | |
1da177e4 | 89 | */ |
4b5f32ce | 90 | struct meminfo meminfo; |
5e709827 | 91 | |
b2b755b5 | 92 | void show_mem(unsigned int filter) |
1da177e4 LT |
93 | { |
94 | int free = 0, total = 0, reserved = 0; | |
be370302 | 95 | int shared = 0, cached = 0, slab = 0, i; |
5e709827 | 96 | struct meminfo * mi = &meminfo; |
1da177e4 LT |
97 | |
98 | printk("Mem-info:\n"); | |
7bf02ea2 | 99 | show_free_areas(filter); |
be370302 RK |
100 | |
101 | for_each_bank (i, mi) { | |
102 | struct membank *bank = &mi->bank[i]; | |
103 | unsigned int pfn1, pfn2; | |
104 | struct page *page, *end; | |
105 | ||
106 | pfn1 = bank_pfn_start(bank); | |
107 | pfn2 = bank_pfn_end(bank); | |
108 | ||
109 | page = pfn_to_page(pfn1); | |
110 | end = pfn_to_page(pfn2 - 1) + 1; | |
111 | ||
112 | do { | |
113 | total++; | |
114 | if (PageReserved(page)) | |
115 | reserved++; | |
116 | else if (PageSwapCache(page)) | |
117 | cached++; | |
118 | else if (PageSlab(page)) | |
119 | slab++; | |
120 | else if (!page_count(page)) | |
121 | free++; | |
122 | else | |
123 | shared += page_count(page) - 1; | |
124 | page++; | |
125 | } while (page < end); | |
1da177e4 LT |
126 | } |
127 | ||
128 | printk("%d pages of RAM\n", total); | |
129 | printk("%d free pages\n", free); | |
130 | printk("%d reserved pages\n", reserved); | |
131 | printk("%d slab pages\n", slab); | |
132 | printk("%d pages shared\n", shared); | |
133 | printk("%d pages swap cached\n", cached); | |
134 | } | |
135 | ||
f25b4b4c | 136 | static void __init find_limits(unsigned long *min, unsigned long *max_low, |
27a3f0e9 | 137 | unsigned long *max_high) |
dde5828f | 138 | { |
f25b4b4c | 139 | struct meminfo *mi = &meminfo; |
dde5828f RK |
140 | int i; |
141 | ||
27a3f0e9 NP |
142 | /* This assumes the meminfo array is properly sorted */ |
143 | *min = bank_pfn_start(&mi->bank[0]); | |
144 | for_each_bank (i, mi) | |
145 | if (mi->bank[i].highmem) | |
146 | break; | |
147 | *max_low = bank_pfn_end(&mi->bank[i - 1]); | |
148 | *max_high = bank_pfn_end(&mi->bank[mi->nr_banks - 1]); | |
dde5828f RK |
149 | } |
150 | ||
a801d276 RK |
151 | static void __init arm_bootmem_init(unsigned long start_pfn, |
152 | unsigned long end_pfn) | |
1da177e4 | 153 | { |
719c1514 | 154 | struct memblock_region *reg; |
90072059 | 155 | unsigned int boot_pages; |
2778f620 | 156 | phys_addr_t bitmap; |
90072059 | 157 | pg_data_t *pgdat; |
1da177e4 | 158 | |
90072059 | 159 | /* |
2778f620 RK |
160 | * Allocate the bootmem bitmap page. This must be in a region |
161 | * of memory which has already been mapped. | |
90072059 RK |
162 | */ |
163 | boot_pages = bootmem_bootmap_pages(end_pfn - start_pfn); | |
2778f620 RK |
164 | bitmap = memblock_alloc_base(boot_pages << PAGE_SHIFT, L1_CACHE_BYTES, |
165 | __pfn_to_phys(end_pfn)); | |
1da177e4 | 166 | |
90072059 | 167 | /* |
be370302 | 168 | * Initialise the bootmem allocator, handing the |
90072059 RK |
169 | * memory banks over to bootmem. |
170 | */ | |
be370302 RK |
171 | node_set_online(0); |
172 | pgdat = NODE_DATA(0); | |
2778f620 | 173 | init_bootmem_node(pgdat, __phys_to_pfn(bitmap), start_pfn, end_pfn); |
1da177e4 | 174 | |
a801d276 RK |
175 | /* Free the lowmem regions from memblock into bootmem. */ |
176 | for_each_memblock(memory, reg) { | |
177 | unsigned long start = memblock_region_memory_base_pfn(reg); | |
178 | unsigned long end = memblock_region_memory_end_pfn(reg); | |
179 | ||
180 | if (end >= end_pfn) | |
181 | end = end_pfn; | |
182 | if (start >= end) | |
183 | break; | |
184 | ||
185 | free_bootmem(__pfn_to_phys(start), (end - start) << PAGE_SHIFT); | |
d2a38ef9 | 186 | } |
90072059 | 187 | |
a801d276 | 188 | /* Reserve the lowmem memblock reserved regions in bootmem. */ |
719c1514 | 189 | for_each_memblock(reserved, reg) { |
a801d276 RK |
190 | unsigned long start = memblock_region_reserved_base_pfn(reg); |
191 | unsigned long end = memblock_region_reserved_end_pfn(reg); | |
192 | ||
193 | if (end >= end_pfn) | |
194 | end = end_pfn; | |
195 | if (start >= end) | |
196 | break; | |
197 | ||
198 | reserve_bootmem(__pfn_to_phys(start), | |
199 | (end - start) << PAGE_SHIFT, BOOTMEM_DEFAULT); | |
1da177e4 | 200 | } |
b7a69ac3 RK |
201 | } |
202 | ||
be20902b | 203 | #ifdef CONFIG_ZONE_DMA |
65032018 | 204 | |
65032018 | 205 | unsigned long arm_dma_zone_size __read_mostly; |
65032018 NP |
206 | EXPORT_SYMBOL(arm_dma_zone_size); |
207 | ||
022ae537 RK |
208 | /* |
209 | * The DMA mask corresponding to the maximum bus address allocatable | |
210 | * using GFP_DMA. The default here places no restriction on DMA | |
211 | * allocations. This must be the smallest DMA mask in the system, | |
212 | * so a successful GFP_DMA allocation will always satisfy this. | |
213 | */ | |
214 | u32 arm_dma_limit; | |
215 | ||
be20902b RK |
216 | static void __init arm_adjust_dma_zone(unsigned long *size, unsigned long *hole, |
217 | unsigned long dma_size) | |
218 | { | |
219 | if (size[0] <= dma_size) | |
220 | return; | |
221 | ||
222 | size[ZONE_NORMAL] = size[0] - dma_size; | |
223 | size[ZONE_DMA] = dma_size; | |
224 | hole[ZONE_NORMAL] = hole[0]; | |
225 | hole[ZONE_DMA] = 0; | |
226 | } | |
227 | #endif | |
228 | ||
a2c54d2a RK |
229 | static void __init arm_bootmem_free(unsigned long min, unsigned long max_low, |
230 | unsigned long max_high) | |
b7a69ac3 RK |
231 | { |
232 | unsigned long zone_size[MAX_NR_ZONES], zhole_size[MAX_NR_ZONES]; | |
a2c54d2a | 233 | struct memblock_region *reg; |
b7a69ac3 | 234 | |
90072059 | 235 | /* |
be370302 | 236 | * initialise the zones. |
90072059 RK |
237 | */ |
238 | memset(zone_size, 0, sizeof(zone_size)); | |
90072059 RK |
239 | |
240 | /* | |
be370302 RK |
241 | * The memory size has already been determined. If we need |
242 | * to do anything fancy with the allocation of this memory | |
243 | * to the zones, now is the time to do it. | |
90072059 | 244 | */ |
dde5828f RK |
245 | zone_size[0] = max_low - min; |
246 | #ifdef CONFIG_HIGHMEM | |
247 | zone_size[ZONE_HIGHMEM] = max_high - max_low; | |
248 | #endif | |
90072059 RK |
249 | |
250 | /* | |
be370302 RK |
251 | * Calculate the size of the holes. |
252 | * holes = node_size - sum(bank_sizes) | |
90072059 | 253 | */ |
dde5828f | 254 | memcpy(zhole_size, zone_size, sizeof(zhole_size)); |
a2c54d2a RK |
255 | for_each_memblock(memory, reg) { |
256 | unsigned long start = memblock_region_memory_base_pfn(reg); | |
257 | unsigned long end = memblock_region_memory_end_pfn(reg); | |
258 | ||
259 | if (start < max_low) { | |
260 | unsigned long low_end = min(end, max_low); | |
261 | zhole_size[0] -= low_end - start; | |
262 | } | |
dde5828f | 263 | #ifdef CONFIG_HIGHMEM |
a2c54d2a RK |
264 | if (end > max_low) { |
265 | unsigned long high_start = max(start, max_low); | |
266 | zhole_size[ZONE_HIGHMEM] -= end - high_start; | |
267 | } | |
dde5828f | 268 | #endif |
dde5828f | 269 | } |
90072059 | 270 | |
65032018 | 271 | #ifdef CONFIG_ZONE_DMA |
90072059 RK |
272 | /* |
273 | * Adjust the sizes according to any special requirements for | |
274 | * this machine type. | |
275 | */ | |
65032018 NP |
276 | if (arm_dma_zone_size) { |
277 | arm_adjust_dma_zone(zone_size, zhole_size, | |
278 | arm_dma_zone_size >> PAGE_SHIFT); | |
279 | arm_dma_limit = PHYS_OFFSET + arm_dma_zone_size - 1; | |
280 | } else | |
281 | arm_dma_limit = 0xffffffff; | |
be20902b | 282 | #endif |
90072059 | 283 | |
be370302 | 284 | free_area_init_node(0, zone_size, min, zhole_size); |
1da177e4 LT |
285 | } |
286 | ||
7b7bf499 | 287 | #ifdef CONFIG_HAVE_ARCH_PFN_VALID |
b7cfda9f RK |
288 | int pfn_valid(unsigned long pfn) |
289 | { | |
fb492c91 | 290 | return memblock_is_memory(__pfn_to_phys(pfn)); |
b7cfda9f RK |
291 | } |
292 | EXPORT_SYMBOL(pfn_valid); | |
7b7bf499 | 293 | #endif |
657e12fd | 294 | |
7b7bf499 | 295 | #ifndef CONFIG_SPARSEMEM |
eda2e5dc | 296 | static void arm_memory_present(void) |
657e12fd RK |
297 | { |
298 | } | |
299 | #else | |
eda2e5dc | 300 | static void arm_memory_present(void) |
657e12fd | 301 | { |
719c1514 | 302 | struct memblock_region *reg; |
719c1514 | 303 | |
7c996361 | 304 | for_each_memblock(memory, reg) |
c7fc2de0 YL |
305 | memory_present(0, memblock_region_memory_base_pfn(reg), |
306 | memblock_region_memory_end_pfn(reg)); | |
657e12fd | 307 | } |
b7cfda9f RK |
308 | #endif |
309 | ||
8d717a52 | 310 | void __init arm_memblock_init(struct meminfo *mi, struct machine_desc *mdesc) |
2778f620 RK |
311 | { |
312 | int i; | |
313 | ||
2778f620 RK |
314 | for (i = 0; i < mi->nr_banks; i++) |
315 | memblock_add(mi->bank[i].start, mi->bank[i].size); | |
316 | ||
317 | /* Register the kernel text, kernel data and initrd with memblock. */ | |
318 | #ifdef CONFIG_XIP_KERNEL | |
842eab40 | 319 | memblock_reserve(__pa(_sdata), _end - _sdata); |
2778f620 RK |
320 | #else |
321 | memblock_reserve(__pa(_stext), _end - _stext); | |
322 | #endif | |
323 | #ifdef CONFIG_BLK_DEV_INITRD | |
8f4b8c76 RK |
324 | if (phys_initrd_size && |
325 | !memblock_is_region_memory(phys_initrd_start, phys_initrd_size)) { | |
326 | pr_err("INITRD: 0x%08lx+0x%08lx is not a memory region - disabling initrd\n", | |
327 | phys_initrd_start, phys_initrd_size); | |
328 | phys_initrd_start = phys_initrd_size = 0; | |
329 | } | |
b0a2679d RK |
330 | if (phys_initrd_size && |
331 | memblock_is_region_reserved(phys_initrd_start, phys_initrd_size)) { | |
332 | pr_err("INITRD: 0x%08lx+0x%08lx overlaps in-use memory region - disabling initrd\n", | |
333 | phys_initrd_start, phys_initrd_size); | |
334 | phys_initrd_start = phys_initrd_size = 0; | |
335 | } | |
2778f620 RK |
336 | if (phys_initrd_size) { |
337 | memblock_reserve(phys_initrd_start, phys_initrd_size); | |
338 | ||
339 | /* Now convert initrd to virtual addresses */ | |
340 | initrd_start = __phys_to_virt(phys_initrd_start); | |
341 | initrd_end = initrd_start + phys_initrd_size; | |
342 | } | |
343 | #endif | |
344 | ||
345 | arm_mm_memblock_reserve(); | |
93c02ab4 | 346 | arm_dt_memblock_reserve(); |
2778f620 | 347 | |
8d717a52 RK |
348 | /* reserve any platform specific memblock areas */ |
349 | if (mdesc->reserve) | |
350 | mdesc->reserve(); | |
351 | ||
1aadc056 | 352 | memblock_allow_resize(); |
2778f620 RK |
353 | memblock_dump_all(); |
354 | } | |
355 | ||
8d717a52 | 356 | void __init bootmem_init(void) |
1da177e4 | 357 | { |
dde5828f | 358 | unsigned long min, max_low, max_high; |
1da177e4 | 359 | |
dde5828f RK |
360 | max_low = max_high = 0; |
361 | ||
f25b4b4c | 362 | find_limits(&min, &max_low, &max_high); |
dde5828f | 363 | |
a801d276 | 364 | arm_bootmem_init(min, max_low); |
dde5828f | 365 | |
be370302 RK |
366 | /* |
367 | * Sparsemem tries to allocate bootmem in memory_present(), | |
368 | * so must be done after the fixed reservations | |
369 | */ | |
eda2e5dc | 370 | arm_memory_present(); |
1da177e4 | 371 | |
b7a69ac3 RK |
372 | /* |
373 | * sparse_init() needs the bootmem allocator up and running. | |
374 | */ | |
375 | sparse_init(); | |
376 | ||
377 | /* | |
be370302 | 378 | * Now free the memory - free_area_init_node needs |
b7a69ac3 RK |
379 | * the sparse mem_map arrays initialized by sparse_init() |
380 | * for memmap_init_zone(), otherwise all PFNs are invalid. | |
381 | */ | |
a2c54d2a | 382 | arm_bootmem_free(min, max_low, max_high); |
b7a69ac3 | 383 | |
90072059 RK |
384 | /* |
385 | * This doesn't seem to be used by the Linux memory manager any | |
386 | * more, but is used by ll_rw_block. If we can get rid of it, we | |
387 | * also get rid of some of the stuff above as well. | |
388 | * | |
389 | * Note: max_low_pfn and max_pfn reflect the number of _pages_ in | |
390 | * the system, not the maximum PFN. | |
391 | */ | |
dde5828f RK |
392 | max_low_pfn = max_low - PHYS_PFN_OFFSET; |
393 | max_pfn = max_high - PHYS_PFN_OFFSET; | |
90072059 | 394 | } |
1da177e4 | 395 | |
6db015e4 | 396 | static inline int free_area(unsigned long pfn, unsigned long end, char *s) |
1da177e4 | 397 | { |
6db015e4 | 398 | unsigned int pages = 0, size = (end - pfn) << (PAGE_SHIFT - 10); |
1da177e4 | 399 | |
6db015e4 NP |
400 | for (; pfn < end; pfn++) { |
401 | struct page *page = pfn_to_page(pfn); | |
1da177e4 | 402 | ClearPageReserved(page); |
7835e98b | 403 | init_page_count(page); |
6db015e4 NP |
404 | __free_page(page); |
405 | pages++; | |
1da177e4 LT |
406 | } |
407 | ||
408 | if (size && s) | |
409 | printk(KERN_INFO "Freeing %s memory: %dK\n", s, size); | |
6db015e4 NP |
410 | |
411 | return pages; | |
1da177e4 LT |
412 | } |
413 | ||
54d52573 SB |
414 | /* |
415 | * Poison init memory with an undefined instruction (ARM) or a branch to an | |
416 | * undefined instruction (Thumb). | |
417 | */ | |
418 | static inline void poison_init_mem(void *s, size_t count) | |
419 | { | |
420 | u32 *p = (u32 *)s; | |
bf912d99 | 421 | for (; count != 0; count -= 4) |
54d52573 SB |
422 | *p++ = 0xe7fddef0; |
423 | } | |
424 | ||
a013053d | 425 | static inline void |
be370302 | 426 | free_memmap(unsigned long start_pfn, unsigned long end_pfn) |
a013053d RK |
427 | { |
428 | struct page *start_pg, *end_pg; | |
429 | unsigned long pg, pgend; | |
430 | ||
431 | /* | |
432 | * Convert start_pfn/end_pfn to a struct page pointer. | |
433 | */ | |
3257f43d | 434 | start_pg = pfn_to_page(start_pfn - 1) + 1; |
9af386c8 | 435 | end_pg = pfn_to_page(end_pfn - 1) + 1; |
a013053d RK |
436 | |
437 | /* | |
438 | * Convert to physical addresses, and | |
439 | * round start upwards and end downwards. | |
440 | */ | |
cae6292b WD |
441 | pg = (unsigned long)PAGE_ALIGN(__pa(start_pg)); |
442 | pgend = (unsigned long)__pa(end_pg) & PAGE_MASK; | |
a013053d RK |
443 | |
444 | /* | |
445 | * If there are free pages between these, | |
446 | * free the section of the memmap array. | |
447 | */ | |
448 | if (pg < pgend) | |
be370302 | 449 | free_bootmem(pg, pgend - pg); |
a013053d RK |
450 | } |
451 | ||
452 | /* | |
453 | * The mem_map array can get very big. Free the unused area of the memory map. | |
454 | */ | |
be370302 | 455 | static void __init free_unused_memmap(struct meminfo *mi) |
a013053d RK |
456 | { |
457 | unsigned long bank_start, prev_bank_end = 0; | |
458 | unsigned int i; | |
459 | ||
460 | /* | |
3260e529 MB |
461 | * This relies on each bank being in address order. |
462 | * The banks are sorted previously in bootmem_init(). | |
a013053d | 463 | */ |
be370302 | 464 | for_each_bank(i, mi) { |
d2a38ef9 RK |
465 | struct membank *bank = &mi->bank[i]; |
466 | ||
467 | bank_start = bank_pfn_start(bank); | |
a013053d | 468 | |
9af386c8 WD |
469 | #ifdef CONFIG_SPARSEMEM |
470 | /* | |
471 | * Take care not to free memmap entries that don't exist | |
472 | * due to SPARSEMEM sections which aren't present. | |
473 | */ | |
474 | bank_start = min(bank_start, | |
475 | ALIGN(prev_bank_end, PAGES_PER_SECTION)); | |
002ea9ee LW |
476 | #else |
477 | /* | |
478 | * Align down here since the VM subsystem insists that the | |
479 | * memmap entries are valid from the bank start aligned to | |
480 | * MAX_ORDER_NR_PAGES. | |
481 | */ | |
482 | bank_start = round_down(bank_start, MAX_ORDER_NR_PAGES); | |
9af386c8 | 483 | #endif |
a013053d RK |
484 | /* |
485 | * If we had a previous bank, and there is a space | |
486 | * between the current bank and the previous, free it. | |
487 | */ | |
3260e529 | 488 | if (prev_bank_end && prev_bank_end < bank_start) |
be370302 | 489 | free_memmap(prev_bank_end, bank_start); |
a013053d | 490 | |
3260e529 MB |
491 | /* |
492 | * Align up here since the VM subsystem insists that the | |
493 | * memmap entries are valid from the bank end aligned to | |
494 | * MAX_ORDER_NR_PAGES. | |
495 | */ | |
496 | prev_bank_end = ALIGN(bank_pfn_end(bank), MAX_ORDER_NR_PAGES); | |
a013053d | 497 | } |
9af386c8 WD |
498 | |
499 | #ifdef CONFIG_SPARSEMEM | |
500 | if (!IS_ALIGNED(prev_bank_end, PAGES_PER_SECTION)) | |
501 | free_memmap(prev_bank_end, | |
502 | ALIGN(prev_bank_end, PAGES_PER_SECTION)); | |
503 | #endif | |
a013053d RK |
504 | } |
505 | ||
d0e775af RK |
506 | static void __init free_highpages(void) |
507 | { | |
508 | #ifdef CONFIG_HIGHMEM | |
df4f14c7 RK |
509 | unsigned long max_low = max_low_pfn + PHYS_PFN_OFFSET; |
510 | struct memblock_region *mem, *res; | |
d0e775af RK |
511 | |
512 | /* set highmem page free */ | |
df4f14c7 RK |
513 | for_each_memblock(memory, mem) { |
514 | unsigned long start = memblock_region_memory_base_pfn(mem); | |
515 | unsigned long end = memblock_region_memory_end_pfn(mem); | |
516 | ||
517 | /* Ignore complete lowmem entries */ | |
518 | if (end <= max_low) | |
519 | continue; | |
520 | ||
521 | /* Truncate partial highmem entries */ | |
522 | if (start < max_low) | |
523 | start = max_low; | |
524 | ||
525 | /* Find and exclude any reserved regions */ | |
526 | for_each_memblock(reserved, res) { | |
527 | unsigned long res_start, res_end; | |
528 | ||
529 | res_start = memblock_region_reserved_base_pfn(res); | |
530 | res_end = memblock_region_reserved_end_pfn(res); | |
531 | ||
532 | if (res_end < start) | |
533 | continue; | |
534 | if (res_start < start) | |
535 | res_start = start; | |
536 | if (res_start > end) | |
537 | res_start = end; | |
538 | if (res_end > end) | |
539 | res_end = end; | |
540 | if (res_start != start) | |
541 | totalhigh_pages += free_area(start, res_start, | |
542 | NULL); | |
543 | start = res_end; | |
544 | if (start == end) | |
545 | break; | |
546 | } | |
547 | ||
548 | /* And now free anything which remains */ | |
549 | if (start < end) | |
d0e775af RK |
550 | totalhigh_pages += free_area(start, end, NULL); |
551 | } | |
552 | totalram_pages += totalhigh_pages; | |
553 | #endif | |
554 | } | |
555 | ||
1da177e4 LT |
556 | /* |
557 | * mem_init() marks the free areas in the mem_map and tells us how much | |
558 | * memory is free. This is done after various parts of the system have | |
559 | * claimed their memory after the kernel image. | |
560 | */ | |
561 | void __init mem_init(void) | |
562 | { | |
db9ef1af | 563 | unsigned long reserved_pages, free_pages; |
47ea3c15 | 564 | struct memblock_region *reg; |
be370302 | 565 | int i; |
1dbd30e9 LW |
566 | #ifdef CONFIG_HAVE_TCM |
567 | /* These pointers are filled in on TCM detection */ | |
568 | extern u32 dtcm_end; | |
569 | extern u32 itcm_end; | |
570 | #endif | |
1da177e4 | 571 | |
3835f6cb | 572 | max_mapnr = pfn_to_page(max_pfn + PHYS_PFN_OFFSET) - mem_map; |
1da177e4 | 573 | |
1da177e4 | 574 | /* this will put all unused low memory onto the freelists */ |
be370302 | 575 | free_unused_memmap(&meminfo); |
a013053d | 576 | |
be370302 | 577 | totalram_pages += free_all_bootmem(); |
1da177e4 LT |
578 | |
579 | #ifdef CONFIG_SA1111 | |
580 | /* now that our DMA memory is actually so designated, we can free it */ | |
6db015e4 NP |
581 | totalram_pages += free_area(PHYS_PFN_OFFSET, |
582 | __phys_to_pfn(__pa(swapper_pg_dir)), NULL); | |
1da177e4 LT |
583 | #endif |
584 | ||
d0e775af | 585 | free_highpages(); |
3835f6cb | 586 | |
db9ef1af FB |
587 | reserved_pages = free_pages = 0; |
588 | ||
be370302 RK |
589 | for_each_bank(i, &meminfo) { |
590 | struct membank *bank = &meminfo.bank[i]; | |
591 | unsigned int pfn1, pfn2; | |
592 | struct page *page, *end; | |
593 | ||
594 | pfn1 = bank_pfn_start(bank); | |
595 | pfn2 = bank_pfn_end(bank); | |
596 | ||
597 | page = pfn_to_page(pfn1); | |
598 | end = pfn_to_page(pfn2 - 1) + 1; | |
599 | ||
600 | do { | |
601 | if (PageReserved(page)) | |
602 | reserved_pages++; | |
603 | else if (!page_count(page)) | |
604 | free_pages++; | |
605 | page++; | |
606 | } while (page < end); | |
db9ef1af FB |
607 | } |
608 | ||
1da177e4 LT |
609 | /* |
610 | * Since our memory may not be contiguous, calculate the | |
611 | * real number of pages we have in this system | |
612 | */ | |
613 | printk(KERN_INFO "Memory:"); | |
1da177e4 | 614 | num_physpages = 0; |
47ea3c15 RK |
615 | for_each_memblock(memory, reg) { |
616 | unsigned long pages = memblock_region_memory_end_pfn(reg) - | |
617 | memblock_region_memory_base_pfn(reg); | |
618 | num_physpages += pages; | |
619 | printk(" %ldMB", pages >> (20 - PAGE_SHIFT)); | |
1da177e4 | 620 | } |
1da177e4 | 621 | printk(" = %luMB total\n", num_physpages >> (20 - PAGE_SHIFT)); |
6db015e4 | 622 | |
db9ef1af FB |
623 | printk(KERN_NOTICE "Memory: %luk/%luk available, %luk reserved, %luK highmem\n", |
624 | nr_free_pages() << (PAGE_SHIFT-10), | |
625 | free_pages << (PAGE_SHIFT-10), | |
626 | reserved_pages << (PAGE_SHIFT-10), | |
4b529401 | 627 | totalhigh_pages << (PAGE_SHIFT-10)); |
1da177e4 | 628 | |
db9ef1af FB |
629 | #define MLK(b, t) b, t, ((t) - (b)) >> 10 |
630 | #define MLM(b, t) b, t, ((t) - (b)) >> 20 | |
631 | #define MLK_ROUNDUP(b, t) b, t, DIV_ROUND_UP(((t) - (b)), SZ_1K) | |
632 | ||
633 | printk(KERN_NOTICE "Virtual kernel memory layout:\n" | |
634 | " vector : 0x%08lx - 0x%08lx (%4ld kB)\n" | |
07d2a5c7 | 635 | #ifdef CONFIG_HAVE_TCM |
07d2a5c7 | 636 | " DTCM : 0x%08lx - 0x%08lx (%4ld kB)\n" |
07d2a5c7 | 637 | " ITCM : 0x%08lx - 0x%08lx (%4ld kB)\n" |
07d2a5c7 | 638 | #endif |
db9ef1af FB |
639 | " fixmap : 0x%08lx - 0x%08lx (%4ld kB)\n" |
640 | " vmalloc : 0x%08lx - 0x%08lx (%4ld MB)\n" | |
641 | " lowmem : 0x%08lx - 0x%08lx (%4ld MB)\n" | |
642 | #ifdef CONFIG_HIGHMEM | |
643 | " pkmap : 0x%08lx - 0x%08lx (%4ld MB)\n" | |
644 | #endif | |
645 | " modules : 0x%08lx - 0x%08lx (%4ld MB)\n" | |
db9ef1af | 646 | " .text : 0x%p" " - 0x%p" " (%4d kB)\n" |
3835d69a | 647 | " .init : 0x%p" " - 0x%p" " (%4d kB)\n" |
45f6d7e0 RV |
648 | " .data : 0x%p" " - 0x%p" " (%4d kB)\n" |
649 | " .bss : 0x%p" " - 0x%p" " (%4d kB)\n", | |
db9ef1af FB |
650 | |
651 | MLK(UL(CONFIG_VECTORS_BASE), UL(CONFIG_VECTORS_BASE) + | |
652 | (PAGE_SIZE)), | |
07d2a5c7 | 653 | #ifdef CONFIG_HAVE_TCM |
1dbd30e9 LW |
654 | MLK(DTCM_OFFSET, (unsigned long) dtcm_end), |
655 | MLK(ITCM_OFFSET, (unsigned long) itcm_end), | |
07d2a5c7 | 656 | #endif |
db9ef1af | 657 | MLK(FIXADDR_START, FIXADDR_TOP), |
c931b4f6 | 658 | MLM(VMALLOC_START, VMALLOC_END), |
db9ef1af FB |
659 | MLM(PAGE_OFFSET, (unsigned long)high_memory), |
660 | #ifdef CONFIG_HIGHMEM | |
661 | MLM(PKMAP_BASE, (PKMAP_BASE) + (LAST_PKMAP) * | |
662 | (PAGE_SIZE)), | |
663 | #endif | |
664 | MLM(MODULES_VADDR, MODULES_END), | |
665 | ||
db9ef1af | 666 | MLK_ROUNDUP(_text, _etext), |
3835d69a | 667 | MLK_ROUNDUP(__init_begin, __init_end), |
45f6d7e0 RV |
668 | MLK_ROUNDUP(_sdata, _edata), |
669 | MLK_ROUNDUP(__bss_start, __bss_stop)); | |
db9ef1af FB |
670 | |
671 | #undef MLK | |
672 | #undef MLM | |
673 | #undef MLK_ROUNDUP | |
674 | ||
a1839272 FB |
675 | /* |
676 | * Check boundaries twice: Some fundamental inconsistencies can | |
677 | * be detected at build time already. | |
678 | */ | |
679 | #ifdef CONFIG_MMU | |
a1839272 FB |
680 | BUILD_BUG_ON(TASK_SIZE > MODULES_VADDR); |
681 | BUG_ON(TASK_SIZE > MODULES_VADDR); | |
682 | #endif | |
683 | ||
684 | #ifdef CONFIG_HIGHMEM | |
685 | BUILD_BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE > PAGE_OFFSET); | |
686 | BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE > PAGE_OFFSET); | |
687 | #endif | |
688 | ||
1da177e4 LT |
689 | if (PAGE_SIZE >= 16384 && num_physpages <= 128) { |
690 | extern int sysctl_overcommit_memory; | |
691 | /* | |
692 | * On a machine this small we won't get | |
693 | * anywhere without overcommit, so turn | |
694 | * it on by default. | |
695 | */ | |
696 | sysctl_overcommit_memory = OVERCOMMIT_ALWAYS; | |
697 | } | |
698 | } | |
699 | ||
700 | void free_initmem(void) | |
701 | { | |
bc581770 | 702 | #ifdef CONFIG_HAVE_TCM |
ea208f64 | 703 | extern char __tcm_start, __tcm_end; |
bc581770 | 704 | |
54d52573 | 705 | poison_init_mem(&__tcm_start, &__tcm_end - &__tcm_start); |
ea208f64 LW |
706 | totalram_pages += free_area(__phys_to_pfn(__pa(&__tcm_start)), |
707 | __phys_to_pfn(__pa(&__tcm_end)), | |
bc581770 LW |
708 | "TCM link"); |
709 | #endif | |
710 | ||
54d52573 | 711 | poison_init_mem(__init_begin, __init_end - __init_begin); |
6db015e4 | 712 | if (!machine_is_integrator() && !machine_is_cintegrator()) |
37efe642 RK |
713 | totalram_pages += free_area(__phys_to_pfn(__pa(__init_begin)), |
714 | __phys_to_pfn(__pa(__init_end)), | |
6db015e4 | 715 | "init"); |
1da177e4 LT |
716 | } |
717 | ||
718 | #ifdef CONFIG_BLK_DEV_INITRD | |
719 | ||
720 | static int keep_initrd; | |
721 | ||
722 | void free_initrd_mem(unsigned long start, unsigned long end) | |
723 | { | |
54d52573 SB |
724 | if (!keep_initrd) { |
725 | poison_init_mem((void *)start, PAGE_ALIGN(end) - start); | |
6db015e4 NP |
726 | totalram_pages += free_area(__phys_to_pfn(__pa(start)), |
727 | __phys_to_pfn(__pa(end)), | |
728 | "initrd"); | |
54d52573 | 729 | } |
1da177e4 LT |
730 | } |
731 | ||
732 | static int __init keepinitrd_setup(char *__unused) | |
733 | { | |
734 | keep_initrd = 1; | |
735 | return 1; | |
736 | } | |
737 | ||
738 | __setup("keepinitrd", keepinitrd_setup); | |
739 | #endif |