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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 | 25 | |
b4b20ad8 | 26 | #include <asm/cp15.h> |
1da177e4 | 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 | ||
b4b20ad8 RK |
40 | #ifdef CONFIG_CPU_CP15_MMU |
41 | unsigned long __init __clear_cr(unsigned long mask) | |
42 | { | |
b4b20ad8 RK |
43 | cr_alignment = cr_alignment & ~mask; |
44 | return cr_alignment; | |
45 | } | |
46 | #endif | |
47 | ||
de22cc6e | 48 | static phys_addr_t phys_initrd_start __initdata = 0; |
012d1f4a RK |
49 | static unsigned long phys_initrd_size __initdata = 0; |
50 | ||
2b0d8c25 | 51 | static int __init early_initrd(char *p) |
012d1f4a | 52 | { |
de22cc6e VA |
53 | phys_addr_t start; |
54 | unsigned long size; | |
2b0d8c25 | 55 | char *endp; |
012d1f4a | 56 | |
2b0d8c25 JK |
57 | start = memparse(p, &endp); |
58 | if (*endp == ',') { | |
59 | size = memparse(endp + 1, NULL); | |
012d1f4a RK |
60 | |
61 | phys_initrd_start = start; | |
62 | phys_initrd_size = size; | |
63 | } | |
2b0d8c25 | 64 | return 0; |
012d1f4a | 65 | } |
2b0d8c25 | 66 | early_param("initrd", early_initrd); |
012d1f4a RK |
67 | |
68 | static int __init parse_tag_initrd(const struct tag *tag) | |
69 | { | |
70 | printk(KERN_WARNING "ATAG_INITRD is deprecated; " | |
71 | "please update your bootloader.\n"); | |
72 | phys_initrd_start = __virt_to_phys(tag->u.initrd.start); | |
73 | phys_initrd_size = tag->u.initrd.size; | |
74 | return 0; | |
75 | } | |
76 | ||
77 | __tagtable(ATAG_INITRD, parse_tag_initrd); | |
78 | ||
79 | static int __init parse_tag_initrd2(const struct tag *tag) | |
80 | { | |
81 | phys_initrd_start = tag->u.initrd.start; | |
82 | phys_initrd_size = tag->u.initrd.size; | |
83 | return 0; | |
84 | } | |
85 | ||
86 | __tagtable(ATAG_INITRD2, parse_tag_initrd2); | |
1da177e4 LT |
87 | |
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 | */ |
b2b755b5 | 93 | void show_mem(unsigned int filter) |
1da177e4 LT |
94 | { |
95 | int free = 0, total = 0, reserved = 0; | |
1c2f87c2 LA |
96 | int shared = 0, cached = 0, slab = 0; |
97 | struct memblock_region *reg; | |
1da177e4 LT |
98 | |
99 | printk("Mem-info:\n"); | |
7bf02ea2 | 100 | show_free_areas(filter); |
be370302 | 101 | |
1c2f87c2 | 102 | for_each_memblock (memory, reg) { |
be370302 RK |
103 | unsigned int pfn1, pfn2; |
104 | struct page *page, *end; | |
105 | ||
1c2f87c2 LA |
106 | pfn1 = memblock_region_memory_base_pfn(reg); |
107 | pfn2 = memblock_region_memory_end_pfn(reg); | |
be370302 RK |
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; | |
1c2f87c2 LA |
124 | pfn1++; |
125 | page = pfn_to_page(pfn1); | |
126 | } while (pfn1 < pfn2); | |
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 | { |
1c2f87c2 LA |
140 | *max_low = PFN_DOWN(memblock_get_current_limit()); |
141 | *min = PFN_UP(memblock_start_of_DRAM()); | |
142 | *max_high = PFN_DOWN(memblock_end_of_DRAM()); | |
dde5828f RK |
143 | } |
144 | ||
be20902b | 145 | #ifdef CONFIG_ZONE_DMA |
65032018 | 146 | |
364230b9 | 147 | phys_addr_t arm_dma_zone_size __read_mostly; |
65032018 NP |
148 | EXPORT_SYMBOL(arm_dma_zone_size); |
149 | ||
022ae537 RK |
150 | /* |
151 | * The DMA mask corresponding to the maximum bus address allocatable | |
152 | * using GFP_DMA. The default here places no restriction on DMA | |
153 | * allocations. This must be the smallest DMA mask in the system, | |
154 | * so a successful GFP_DMA allocation will always satisfy this. | |
155 | */ | |
4986e5c7 | 156 | phys_addr_t arm_dma_limit; |
4dcfa600 | 157 | unsigned long arm_dma_pfn_limit; |
022ae537 | 158 | |
be20902b RK |
159 | static void __init arm_adjust_dma_zone(unsigned long *size, unsigned long *hole, |
160 | unsigned long dma_size) | |
161 | { | |
162 | if (size[0] <= dma_size) | |
163 | return; | |
164 | ||
165 | size[ZONE_NORMAL] = size[0] - dma_size; | |
166 | size[ZONE_DMA] = dma_size; | |
167 | hole[ZONE_NORMAL] = hole[0]; | |
168 | hole[ZONE_DMA] = 0; | |
169 | } | |
170 | #endif | |
171 | ||
ff69a4c8 | 172 | void __init setup_dma_zone(const struct machine_desc *mdesc) |
c7909509 MS |
173 | { |
174 | #ifdef CONFIG_ZONE_DMA | |
175 | if (mdesc->dma_zone_size) { | |
176 | arm_dma_zone_size = mdesc->dma_zone_size; | |
6bcac805 | 177 | arm_dma_limit = PHYS_OFFSET + arm_dma_zone_size - 1; |
c7909509 MS |
178 | } else |
179 | arm_dma_limit = 0xffffffff; | |
4dcfa600 | 180 | arm_dma_pfn_limit = arm_dma_limit >> PAGE_SHIFT; |
c7909509 MS |
181 | #endif |
182 | } | |
183 | ||
84f452b1 | 184 | static void __init zone_sizes_init(unsigned long min, unsigned long max_low, |
a2c54d2a | 185 | unsigned long max_high) |
b7a69ac3 RK |
186 | { |
187 | unsigned long zone_size[MAX_NR_ZONES], zhole_size[MAX_NR_ZONES]; | |
a2c54d2a | 188 | struct memblock_region *reg; |
b7a69ac3 | 189 | |
90072059 | 190 | /* |
be370302 | 191 | * initialise the zones. |
90072059 RK |
192 | */ |
193 | memset(zone_size, 0, sizeof(zone_size)); | |
90072059 RK |
194 | |
195 | /* | |
be370302 RK |
196 | * The memory size has already been determined. If we need |
197 | * to do anything fancy with the allocation of this memory | |
198 | * to the zones, now is the time to do it. | |
90072059 | 199 | */ |
dde5828f RK |
200 | zone_size[0] = max_low - min; |
201 | #ifdef CONFIG_HIGHMEM | |
202 | zone_size[ZONE_HIGHMEM] = max_high - max_low; | |
203 | #endif | |
90072059 RK |
204 | |
205 | /* | |
be370302 RK |
206 | * Calculate the size of the holes. |
207 | * holes = node_size - sum(bank_sizes) | |
90072059 | 208 | */ |
dde5828f | 209 | memcpy(zhole_size, zone_size, sizeof(zhole_size)); |
a2c54d2a RK |
210 | for_each_memblock(memory, reg) { |
211 | unsigned long start = memblock_region_memory_base_pfn(reg); | |
212 | unsigned long end = memblock_region_memory_end_pfn(reg); | |
213 | ||
214 | if (start < max_low) { | |
215 | unsigned long low_end = min(end, max_low); | |
216 | zhole_size[0] -= low_end - start; | |
217 | } | |
dde5828f | 218 | #ifdef CONFIG_HIGHMEM |
a2c54d2a RK |
219 | if (end > max_low) { |
220 | unsigned long high_start = max(start, max_low); | |
221 | zhole_size[ZONE_HIGHMEM] -= end - high_start; | |
222 | } | |
dde5828f | 223 | #endif |
dde5828f | 224 | } |
90072059 | 225 | |
65032018 | 226 | #ifdef CONFIG_ZONE_DMA |
90072059 RK |
227 | /* |
228 | * Adjust the sizes according to any special requirements for | |
229 | * this machine type. | |
230 | */ | |
c7909509 | 231 | if (arm_dma_zone_size) |
65032018 NP |
232 | arm_adjust_dma_zone(zone_size, zhole_size, |
233 | arm_dma_zone_size >> PAGE_SHIFT); | |
be20902b | 234 | #endif |
90072059 | 235 | |
be370302 | 236 | free_area_init_node(0, zone_size, min, zhole_size); |
1da177e4 LT |
237 | } |
238 | ||
7b7bf499 | 239 | #ifdef CONFIG_HAVE_ARCH_PFN_VALID |
b7cfda9f RK |
240 | int pfn_valid(unsigned long pfn) |
241 | { | |
fb492c91 | 242 | return memblock_is_memory(__pfn_to_phys(pfn)); |
b7cfda9f RK |
243 | } |
244 | EXPORT_SYMBOL(pfn_valid); | |
7b7bf499 | 245 | #endif |
657e12fd | 246 | |
7b7bf499 | 247 | #ifndef CONFIG_SPARSEMEM |
14904927 | 248 | static void __init arm_memory_present(void) |
657e12fd RK |
249 | { |
250 | } | |
251 | #else | |
14904927 | 252 | static void __init arm_memory_present(void) |
657e12fd | 253 | { |
719c1514 | 254 | struct memblock_region *reg; |
719c1514 | 255 | |
7c996361 | 256 | for_each_memblock(memory, reg) |
c7fc2de0 YL |
257 | memory_present(0, memblock_region_memory_base_pfn(reg), |
258 | memblock_region_memory_end_pfn(reg)); | |
657e12fd | 259 | } |
b7cfda9f RK |
260 | #endif |
261 | ||
716a3dc2 RK |
262 | static bool arm_memblock_steal_permitted = true; |
263 | ||
bc2827d0 | 264 | phys_addr_t __init arm_memblock_steal(phys_addr_t size, phys_addr_t align) |
716a3dc2 RK |
265 | { |
266 | phys_addr_t phys; | |
267 | ||
268 | BUG_ON(!arm_memblock_steal_permitted); | |
269 | ||
7ac68a4c | 270 | phys = memblock_alloc_base(size, align, MEMBLOCK_ALLOC_ANYWHERE); |
716a3dc2 RK |
271 | memblock_free(phys, size); |
272 | memblock_remove(phys, size); | |
273 | ||
274 | return phys; | |
275 | } | |
276 | ||
1c2f87c2 | 277 | void __init arm_memblock_init(const struct machine_desc *mdesc) |
2778f620 | 278 | { |
2778f620 RK |
279 | /* Register the kernel text, kernel data and initrd with memblock. */ |
280 | #ifdef CONFIG_XIP_KERNEL | |
842eab40 | 281 | memblock_reserve(__pa(_sdata), _end - _sdata); |
2778f620 RK |
282 | #else |
283 | memblock_reserve(__pa(_stext), _end - _stext); | |
284 | #endif | |
285 | #ifdef CONFIG_BLK_DEV_INITRD | |
65939301 | 286 | /* FDT scan will populate initrd_start */ |
4c235cb9 | 287 | if (initrd_start && !phys_initrd_size) { |
65939301 RH |
288 | phys_initrd_start = __virt_to_phys(initrd_start); |
289 | phys_initrd_size = initrd_end - initrd_start; | |
290 | } | |
4c235cb9 | 291 | initrd_start = initrd_end = 0; |
8f4b8c76 RK |
292 | if (phys_initrd_size && |
293 | !memblock_is_region_memory(phys_initrd_start, phys_initrd_size)) { | |
de22cc6e VA |
294 | pr_err("INITRD: 0x%08llx+0x%08lx is not a memory region - disabling initrd\n", |
295 | (u64)phys_initrd_start, phys_initrd_size); | |
8f4b8c76 RK |
296 | phys_initrd_start = phys_initrd_size = 0; |
297 | } | |
b0a2679d RK |
298 | if (phys_initrd_size && |
299 | memblock_is_region_reserved(phys_initrd_start, phys_initrd_size)) { | |
de22cc6e VA |
300 | pr_err("INITRD: 0x%08llx+0x%08lx overlaps in-use memory region - disabling initrd\n", |
301 | (u64)phys_initrd_start, phys_initrd_size); | |
b0a2679d RK |
302 | phys_initrd_start = phys_initrd_size = 0; |
303 | } | |
2778f620 RK |
304 | if (phys_initrd_size) { |
305 | memblock_reserve(phys_initrd_start, phys_initrd_size); | |
306 | ||
307 | /* Now convert initrd to virtual addresses */ | |
308 | initrd_start = __phys_to_virt(phys_initrd_start); | |
309 | initrd_end = initrd_start + phys_initrd_size; | |
310 | } | |
311 | #endif | |
312 | ||
313 | arm_mm_memblock_reserve(); | |
314 | ||
8d717a52 RK |
315 | /* reserve any platform specific memblock areas */ |
316 | if (mdesc->reserve) | |
317 | mdesc->reserve(); | |
318 | ||
bcedb5f9 MS |
319 | early_init_fdt_scan_reserved_mem(); |
320 | ||
c7909509 MS |
321 | /* |
322 | * reserve memory for DMA contigouos allocations, | |
323 | * must come from DMA area inside low memory | |
324 | */ | |
95b0e655 | 325 | dma_contiguous_reserve(arm_dma_limit); |
c7909509 | 326 | |
716a3dc2 | 327 | arm_memblock_steal_permitted = false; |
2778f620 RK |
328 | memblock_dump_all(); |
329 | } | |
330 | ||
8d717a52 | 331 | void __init bootmem_init(void) |
1da177e4 | 332 | { |
dde5828f | 333 | unsigned long min, max_low, max_high; |
1da177e4 | 334 | |
8e58caef | 335 | memblock_allow_resize(); |
dde5828f RK |
336 | max_low = max_high = 0; |
337 | ||
f25b4b4c | 338 | find_limits(&min, &max_low, &max_high); |
dde5828f | 339 | |
be370302 RK |
340 | /* |
341 | * Sparsemem tries to allocate bootmem in memory_present(), | |
342 | * so must be done after the fixed reservations | |
343 | */ | |
eda2e5dc | 344 | arm_memory_present(); |
1da177e4 | 345 | |
b7a69ac3 RK |
346 | /* |
347 | * sparse_init() needs the bootmem allocator up and running. | |
348 | */ | |
349 | sparse_init(); | |
350 | ||
351 | /* | |
be370302 | 352 | * Now free the memory - free_area_init_node needs |
b7a69ac3 RK |
353 | * the sparse mem_map arrays initialized by sparse_init() |
354 | * for memmap_init_zone(), otherwise all PFNs are invalid. | |
355 | */ | |
84f452b1 | 356 | zone_sizes_init(min, max_low, max_high); |
b7a69ac3 | 357 | |
90072059 RK |
358 | /* |
359 | * This doesn't seem to be used by the Linux memory manager any | |
360 | * more, but is used by ll_rw_block. If we can get rid of it, we | |
361 | * also get rid of some of the stuff above as well. | |
90072059 | 362 | */ |
26ba47b1 SS |
363 | min_low_pfn = min; |
364 | max_low_pfn = max_low; | |
365 | max_pfn = max_high; | |
90072059 | 366 | } |
1da177e4 | 367 | |
54d52573 SB |
368 | /* |
369 | * Poison init memory with an undefined instruction (ARM) or a branch to an | |
370 | * undefined instruction (Thumb). | |
371 | */ | |
372 | static inline void poison_init_mem(void *s, size_t count) | |
373 | { | |
374 | u32 *p = (u32 *)s; | |
bf912d99 | 375 | for (; count != 0; count -= 4) |
54d52573 SB |
376 | *p++ = 0xe7fddef0; |
377 | } | |
378 | ||
a013053d | 379 | static inline void |
be370302 | 380 | free_memmap(unsigned long start_pfn, unsigned long end_pfn) |
a013053d RK |
381 | { |
382 | struct page *start_pg, *end_pg; | |
56bc6286 | 383 | phys_addr_t pg, pgend; |
a013053d RK |
384 | |
385 | /* | |
386 | * Convert start_pfn/end_pfn to a struct page pointer. | |
387 | */ | |
3257f43d | 388 | start_pg = pfn_to_page(start_pfn - 1) + 1; |
9af386c8 | 389 | end_pg = pfn_to_page(end_pfn - 1) + 1; |
a013053d RK |
390 | |
391 | /* | |
392 | * Convert to physical addresses, and | |
393 | * round start upwards and end downwards. | |
394 | */ | |
56bc6286 VA |
395 | pg = PAGE_ALIGN(__pa(start_pg)); |
396 | pgend = __pa(end_pg) & PAGE_MASK; | |
a013053d RK |
397 | |
398 | /* | |
399 | * If there are free pages between these, | |
400 | * free the section of the memmap array. | |
401 | */ | |
402 | if (pg < pgend) | |
cfb66586 | 403 | memblock_free_early(pg, pgend - pg); |
a013053d RK |
404 | } |
405 | ||
406 | /* | |
407 | * The mem_map array can get very big. Free the unused area of the memory map. | |
408 | */ | |
1c2f87c2 | 409 | static void __init free_unused_memmap(void) |
a013053d | 410 | { |
1c2f87c2 LA |
411 | unsigned long start, prev_end = 0; |
412 | struct memblock_region *reg; | |
a013053d RK |
413 | |
414 | /* | |
3260e529 MB |
415 | * This relies on each bank being in address order. |
416 | * The banks are sorted previously in bootmem_init(). | |
a013053d | 417 | */ |
1c2f87c2 LA |
418 | for_each_memblock(memory, reg) { |
419 | start = memblock_region_memory_base_pfn(reg); | |
a013053d | 420 | |
9af386c8 WD |
421 | #ifdef CONFIG_SPARSEMEM |
422 | /* | |
423 | * Take care not to free memmap entries that don't exist | |
424 | * due to SPARSEMEM sections which aren't present. | |
425 | */ | |
1c2f87c2 LA |
426 | start = min(start, |
427 | ALIGN(prev_end, PAGES_PER_SECTION)); | |
002ea9ee LW |
428 | #else |
429 | /* | |
430 | * Align down here since the VM subsystem insists that the | |
431 | * memmap entries are valid from the bank start aligned to | |
432 | * MAX_ORDER_NR_PAGES. | |
433 | */ | |
1c2f87c2 | 434 | start = round_down(start, MAX_ORDER_NR_PAGES); |
9af386c8 | 435 | #endif |
a013053d RK |
436 | /* |
437 | * If we had a previous bank, and there is a space | |
438 | * between the current bank and the previous, free it. | |
439 | */ | |
1c2f87c2 LA |
440 | if (prev_end && prev_end < start) |
441 | free_memmap(prev_end, start); | |
a013053d | 442 | |
3260e529 MB |
443 | /* |
444 | * Align up here since the VM subsystem insists that the | |
445 | * memmap entries are valid from the bank end aligned to | |
446 | * MAX_ORDER_NR_PAGES. | |
447 | */ | |
1c2f87c2 LA |
448 | prev_end = ALIGN(memblock_region_memory_end_pfn(reg), |
449 | MAX_ORDER_NR_PAGES); | |
a013053d | 450 | } |
9af386c8 WD |
451 | |
452 | #ifdef CONFIG_SPARSEMEM | |
1c2f87c2 LA |
453 | if (!IS_ALIGNED(prev_end, PAGES_PER_SECTION)) |
454 | free_memmap(prev_end, | |
455 | ALIGN(prev_end, PAGES_PER_SECTION)); | |
9af386c8 | 456 | #endif |
a013053d RK |
457 | } |
458 | ||
83db0384 JL |
459 | #ifdef CONFIG_HIGHMEM |
460 | static inline void free_area_high(unsigned long pfn, unsigned long end) | |
461 | { | |
dd6911ef JL |
462 | for (; pfn < end; pfn++) |
463 | free_highmem_page(pfn_to_page(pfn)); | |
83db0384 JL |
464 | } |
465 | #endif | |
466 | ||
d0e775af RK |
467 | static void __init free_highpages(void) |
468 | { | |
469 | #ifdef CONFIG_HIGHMEM | |
26ba47b1 | 470 | unsigned long max_low = max_low_pfn; |
df4f14c7 | 471 | struct memblock_region *mem, *res; |
d0e775af RK |
472 | |
473 | /* set highmem page free */ | |
df4f14c7 RK |
474 | for_each_memblock(memory, mem) { |
475 | unsigned long start = memblock_region_memory_base_pfn(mem); | |
476 | unsigned long end = memblock_region_memory_end_pfn(mem); | |
477 | ||
478 | /* Ignore complete lowmem entries */ | |
479 | if (end <= max_low) | |
480 | continue; | |
481 | ||
482 | /* Truncate partial highmem entries */ | |
483 | if (start < max_low) | |
484 | start = max_low; | |
485 | ||
486 | /* Find and exclude any reserved regions */ | |
487 | for_each_memblock(reserved, res) { | |
488 | unsigned long res_start, res_end; | |
489 | ||
490 | res_start = memblock_region_reserved_base_pfn(res); | |
491 | res_end = memblock_region_reserved_end_pfn(res); | |
492 | ||
493 | if (res_end < start) | |
494 | continue; | |
495 | if (res_start < start) | |
496 | res_start = start; | |
497 | if (res_start > end) | |
498 | res_start = end; | |
499 | if (res_end > end) | |
500 | res_end = end; | |
501 | if (res_start != start) | |
83db0384 | 502 | free_area_high(start, res_start); |
df4f14c7 RK |
503 | start = res_end; |
504 | if (start == end) | |
505 | break; | |
506 | } | |
507 | ||
508 | /* And now free anything which remains */ | |
509 | if (start < end) | |
83db0384 | 510 | free_area_high(start, end); |
d0e775af | 511 | } |
d0e775af RK |
512 | #endif |
513 | } | |
514 | ||
1da177e4 LT |
515 | /* |
516 | * mem_init() marks the free areas in the mem_map and tells us how much | |
517 | * memory is free. This is done after various parts of the system have | |
518 | * claimed their memory after the kernel image. | |
519 | */ | |
520 | void __init mem_init(void) | |
521 | { | |
1dbd30e9 LW |
522 | #ifdef CONFIG_HAVE_TCM |
523 | /* These pointers are filled in on TCM detection */ | |
524 | extern u32 dtcm_end; | |
525 | extern u32 itcm_end; | |
526 | #endif | |
1da177e4 | 527 | |
b3ba41f2 | 528 | set_max_mapnr(pfn_to_page(max_pfn) - mem_map); |
1da177e4 | 529 | |
1da177e4 | 530 | /* this will put all unused low memory onto the freelists */ |
1c2f87c2 | 531 | free_unused_memmap(); |
0c988534 | 532 | free_all_bootmem(); |
1da177e4 LT |
533 | |
534 | #ifdef CONFIG_SA1111 | |
535 | /* now that our DMA memory is actually so designated, we can free it */ | |
bfd65dd9 | 536 | free_reserved_area(__va(PHYS_OFFSET), swapper_pg_dir, -1, NULL); |
1da177e4 LT |
537 | #endif |
538 | ||
d0e775af | 539 | free_highpages(); |
3835f6cb | 540 | |
2450c973 | 541 | mem_init_print_info(NULL); |
1da177e4 | 542 | |
db9ef1af FB |
543 | #define MLK(b, t) b, t, ((t) - (b)) >> 10 |
544 | #define MLM(b, t) b, t, ((t) - (b)) >> 20 | |
545 | #define MLK_ROUNDUP(b, t) b, t, DIV_ROUND_UP(((t) - (b)), SZ_1K) | |
546 | ||
547 | printk(KERN_NOTICE "Virtual kernel memory layout:\n" | |
548 | " vector : 0x%08lx - 0x%08lx (%4ld kB)\n" | |
07d2a5c7 | 549 | #ifdef CONFIG_HAVE_TCM |
07d2a5c7 | 550 | " DTCM : 0x%08lx - 0x%08lx (%4ld kB)\n" |
07d2a5c7 | 551 | " ITCM : 0x%08lx - 0x%08lx (%4ld kB)\n" |
07d2a5c7 | 552 | #endif |
db9ef1af FB |
553 | " fixmap : 0x%08lx - 0x%08lx (%4ld kB)\n" |
554 | " vmalloc : 0x%08lx - 0x%08lx (%4ld MB)\n" | |
555 | " lowmem : 0x%08lx - 0x%08lx (%4ld MB)\n" | |
556 | #ifdef CONFIG_HIGHMEM | |
557 | " pkmap : 0x%08lx - 0x%08lx (%4ld MB)\n" | |
558 | #endif | |
d9277d51 | 559 | #ifdef CONFIG_MODULES |
db9ef1af | 560 | " modules : 0x%08lx - 0x%08lx (%4ld MB)\n" |
d9277d51 | 561 | #endif |
178c3dfe RK |
562 | " .text : 0x%p" " - 0x%p" " (%4td kB)\n" |
563 | " .init : 0x%p" " - 0x%p" " (%4td kB)\n" | |
564 | " .data : 0x%p" " - 0x%p" " (%4td kB)\n" | |
565 | " .bss : 0x%p" " - 0x%p" " (%4td kB)\n", | |
db9ef1af FB |
566 | |
567 | MLK(UL(CONFIG_VECTORS_BASE), UL(CONFIG_VECTORS_BASE) + | |
568 | (PAGE_SIZE)), | |
07d2a5c7 | 569 | #ifdef CONFIG_HAVE_TCM |
1dbd30e9 LW |
570 | MLK(DTCM_OFFSET, (unsigned long) dtcm_end), |
571 | MLK(ITCM_OFFSET, (unsigned long) itcm_end), | |
07d2a5c7 | 572 | #endif |
db9ef1af | 573 | MLK(FIXADDR_START, FIXADDR_TOP), |
c931b4f6 | 574 | MLM(VMALLOC_START, VMALLOC_END), |
db9ef1af FB |
575 | MLM(PAGE_OFFSET, (unsigned long)high_memory), |
576 | #ifdef CONFIG_HIGHMEM | |
577 | MLM(PKMAP_BASE, (PKMAP_BASE) + (LAST_PKMAP) * | |
578 | (PAGE_SIZE)), | |
579 | #endif | |
d9277d51 | 580 | #ifdef CONFIG_MODULES |
db9ef1af | 581 | MLM(MODULES_VADDR, MODULES_END), |
d9277d51 | 582 | #endif |
db9ef1af | 583 | |
db9ef1af | 584 | MLK_ROUNDUP(_text, _etext), |
3835d69a | 585 | MLK_ROUNDUP(__init_begin, __init_end), |
45f6d7e0 RV |
586 | MLK_ROUNDUP(_sdata, _edata), |
587 | MLK_ROUNDUP(__bss_start, __bss_stop)); | |
db9ef1af FB |
588 | |
589 | #undef MLK | |
590 | #undef MLM | |
591 | #undef MLK_ROUNDUP | |
592 | ||
a1839272 FB |
593 | /* |
594 | * Check boundaries twice: Some fundamental inconsistencies can | |
595 | * be detected at build time already. | |
596 | */ | |
597 | #ifdef CONFIG_MMU | |
a1839272 FB |
598 | BUILD_BUG_ON(TASK_SIZE > MODULES_VADDR); |
599 | BUG_ON(TASK_SIZE > MODULES_VADDR); | |
600 | #endif | |
601 | ||
602 | #ifdef CONFIG_HIGHMEM | |
603 | BUILD_BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE > PAGE_OFFSET); | |
604 | BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE > PAGE_OFFSET); | |
605 | #endif | |
606 | ||
2450c973 | 607 | if (PAGE_SIZE >= 16384 && get_num_physpages() <= 128) { |
1da177e4 LT |
608 | extern int sysctl_overcommit_memory; |
609 | /* | |
610 | * On a machine this small we won't get | |
611 | * anywhere without overcommit, so turn | |
612 | * it on by default. | |
613 | */ | |
614 | sysctl_overcommit_memory = OVERCOMMIT_ALWAYS; | |
615 | } | |
616 | } | |
617 | ||
618 | void free_initmem(void) | |
619 | { | |
bc581770 | 620 | #ifdef CONFIG_HAVE_TCM |
ea208f64 | 621 | extern char __tcm_start, __tcm_end; |
bc581770 | 622 | |
54d52573 | 623 | poison_init_mem(&__tcm_start, &__tcm_end - &__tcm_start); |
dbe67df4 | 624 | free_reserved_area(&__tcm_start, &__tcm_end, -1, "TCM link"); |
bc581770 LW |
625 | #endif |
626 | ||
54d52573 | 627 | poison_init_mem(__init_begin, __init_end - __init_begin); |
6db015e4 | 628 | if (!machine_is_integrator() && !machine_is_cintegrator()) |
dbe67df4 | 629 | free_initmem_default(-1); |
1da177e4 LT |
630 | } |
631 | ||
632 | #ifdef CONFIG_BLK_DEV_INITRD | |
633 | ||
634 | static int keep_initrd; | |
635 | ||
636 | void free_initrd_mem(unsigned long start, unsigned long end) | |
637 | { | |
54d52573 | 638 | if (!keep_initrd) { |
421520ba YW |
639 | if (start == initrd_start) |
640 | start = round_down(start, PAGE_SIZE); | |
641 | if (end == initrd_end) | |
642 | end = round_up(end, PAGE_SIZE); | |
643 | ||
54d52573 | 644 | poison_init_mem((void *)start, PAGE_ALIGN(end) - start); |
dbe67df4 | 645 | free_reserved_area((void *)start, (void *)end, -1, "initrd"); |
54d52573 | 646 | } |
1da177e4 LT |
647 | } |
648 | ||
649 | static int __init keepinitrd_setup(char *__unused) | |
650 | { | |
651 | keep_initrd = 1; | |
652 | return 1; | |
653 | } | |
654 | ||
655 | __setup("keepinitrd", keepinitrd_setup); | |
656 | #endif |