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10#include <linux/kernel.h>
11#include <linux/errno.h>
12#include <linux/swap.h>
13#include <linux/init.h>
14#include <linux/bootmem.h>
15#include <linux/mman.h>
16#include <linux/nodemask.h>
17#include <linux/initrd.h>
18#include <linux/highmem.h>
19#include <linux/gfp.h>
20#include <linux/memblock.h>
21#include <linux/sort.h>
22#include <linux/dma-mapping.h>
23#include <linux/export.h>
24
25#include <asm/sections.h>
26#include <asm/setup.h>
27#include <asm/sizes.h>
28#include <asm/tlb.h>
29#include <asm/memblock.h>
30#include <mach/map.h>
31
32#include "mm.h"
33
34static unsigned long phys_initrd_start __initdata = 0x01000000;
35static unsigned long phys_initrd_size __initdata = SZ_8M;
36
37static int __init early_initrd(char *p)
38{
39 unsigned long start, size;
40 char *endp;
41
42 start = memparse(p, &endp);
43 if (*endp == ',') {
44 size = memparse(endp + 1, NULL);
45
46 phys_initrd_start = start;
47 phys_initrd_size = size;
48 }
49 return 0;
50}
51early_param("initrd", early_initrd);
52
53
54
55
56
57
58struct meminfo meminfo;
59
60static void __init find_limits(unsigned long *min, unsigned long *max_low,
61 unsigned long *max_high)
62{
63 struct meminfo *mi = &meminfo;
64 int i;
65
66 *min = -1UL;
67 *max_low = *max_high = 0;
68
69 for_each_bank(i, mi) {
70 struct membank *bank = &mi->bank[i];
71 unsigned long start, end;
72
73 start = bank_pfn_start(bank);
74 end = bank_pfn_end(bank);
75
76 if (*min > start)
77 *min = start;
78 if (*max_high < end)
79 *max_high = end;
80 if (bank->highmem)
81 continue;
82 if (*max_low < end)
83 *max_low = end;
84 }
85}
86
87static void __init uc32_bootmem_init(unsigned long start_pfn,
88 unsigned long end_pfn)
89{
90 struct memblock_region *reg;
91 unsigned int boot_pages;
92 phys_addr_t bitmap;
93 pg_data_t *pgdat;
94
95
96
97
98
99 boot_pages = bootmem_bootmap_pages(end_pfn - start_pfn);
100 bitmap = memblock_alloc_base(boot_pages << PAGE_SHIFT, L1_CACHE_BYTES,
101 __pfn_to_phys(end_pfn));
102
103
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105
106
107 node_set_online(0);
108 pgdat = NODE_DATA(0);
109 init_bootmem_node(pgdat, __phys_to_pfn(bitmap), start_pfn, end_pfn);
110
111
112 for_each_memblock(memory, reg) {
113 unsigned long start = memblock_region_memory_base_pfn(reg);
114 unsigned long end = memblock_region_memory_end_pfn(reg);
115
116 if (end >= end_pfn)
117 end = end_pfn;
118 if (start >= end)
119 break;
120
121 free_bootmem(__pfn_to_phys(start), (end - start) << PAGE_SHIFT);
122 }
123
124
125 for_each_memblock(reserved, reg) {
126 unsigned long start = memblock_region_reserved_base_pfn(reg);
127 unsigned long end = memblock_region_reserved_end_pfn(reg);
128
129 if (end >= end_pfn)
130 end = end_pfn;
131 if (start >= end)
132 break;
133
134 reserve_bootmem(__pfn_to_phys(start),
135 (end - start) << PAGE_SHIFT, BOOTMEM_DEFAULT);
136 }
137}
138
139static void __init uc32_bootmem_free(unsigned long min, unsigned long max_low,
140 unsigned long max_high)
141{
142 unsigned long zone_size[MAX_NR_ZONES], zhole_size[MAX_NR_ZONES];
143 struct memblock_region *reg;
144
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146
147
148 memset(zone_size, 0, sizeof(zone_size));
149
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154
155 zone_size[0] = max_low - min;
156
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160
161 memcpy(zhole_size, zone_size, sizeof(zhole_size));
162 for_each_memblock(memory, reg) {
163 unsigned long start = memblock_region_memory_base_pfn(reg);
164 unsigned long end = memblock_region_memory_end_pfn(reg);
165
166 if (start < max_low) {
167 unsigned long low_end = min(end, max_low);
168 zhole_size[0] -= low_end - start;
169 }
170 }
171
172
173
174
175
176 arch_adjust_zones(zone_size, zhole_size);
177
178 free_area_init_node(0, zone_size, min, zhole_size);
179}
180
181int pfn_valid(unsigned long pfn)
182{
183 return memblock_is_memory(pfn << PAGE_SHIFT);
184}
185EXPORT_SYMBOL(pfn_valid);
186
187static void uc32_memory_present(void)
188{
189}
190
191static int __init meminfo_cmp(const void *_a, const void *_b)
192{
193 const struct membank *a = _a, *b = _b;
194 long cmp = bank_pfn_start(a) - bank_pfn_start(b);
195 return cmp < 0 ? -1 : cmp > 0 ? 1 : 0;
196}
197
198void __init uc32_memblock_init(struct meminfo *mi)
199{
200 int i;
201
202 sort(&meminfo.bank, meminfo.nr_banks, sizeof(meminfo.bank[0]),
203 meminfo_cmp, NULL);
204
205 for (i = 0; i < mi->nr_banks; i++)
206 memblock_add(mi->bank[i].start, mi->bank[i].size);
207
208
209 memblock_reserve(__pa(_text), _end - _text);
210
211#ifdef CONFIG_BLK_DEV_INITRD
212 if (phys_initrd_size) {
213 memblock_reserve(phys_initrd_start, phys_initrd_size);
214
215
216 initrd_start = __phys_to_virt(phys_initrd_start);
217 initrd_end = initrd_start + phys_initrd_size;
218 }
219#endif
220
221 uc32_mm_memblock_reserve();
222
223 memblock_allow_resize();
224 memblock_dump_all();
225}
226
227void __init bootmem_init(void)
228{
229 unsigned long min, max_low, max_high;
230
231 max_low = max_high = 0;
232
233 find_limits(&min, &max_low, &max_high);
234
235 uc32_bootmem_init(min, max_low);
236
237#ifdef CONFIG_SWIOTLB
238 swiotlb_init(1);
239#endif
240
241
242
243
244 uc32_memory_present();
245
246
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248
249 sparse_init();
250
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256 uc32_bootmem_free(min, max_low, max_high);
257
258 high_memory = __va((max_low << PAGE_SHIFT) - 1) + 1;
259
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267
268 max_low_pfn = max_low - PHYS_PFN_OFFSET;
269 max_pfn = max_high - PHYS_PFN_OFFSET;
270}
271
272static inline void
273free_memmap(unsigned long start_pfn, unsigned long end_pfn)
274{
275 struct page *start_pg, *end_pg;
276 unsigned long pg, pgend;
277
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279
280
281 start_pg = pfn_to_page(start_pfn - 1) + 1;
282 end_pg = pfn_to_page(end_pfn);
283
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287
288 pg = PAGE_ALIGN(__pa(start_pg));
289 pgend = __pa(end_pg) & PAGE_MASK;
290
291
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293
294
295 if (pg < pgend)
296 free_bootmem(pg, pgend - pg);
297}
298
299
300
301
302static void __init free_unused_memmap(struct meminfo *mi)
303{
304 unsigned long bank_start, prev_bank_end = 0;
305 unsigned int i;
306
307
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309
310
311 for_each_bank(i, mi) {
312 struct membank *bank = &mi->bank[i];
313
314 bank_start = bank_pfn_start(bank);
315
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319
320 if (prev_bank_end && prev_bank_end < bank_start)
321 free_memmap(prev_bank_end, bank_start);
322
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328 prev_bank_end = ALIGN(bank_pfn_end(bank), MAX_ORDER_NR_PAGES);
329 }
330}
331
332
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334
335
336
337void __init mem_init(void)
338{
339 max_mapnr = pfn_to_page(max_pfn + PHYS_PFN_OFFSET) - mem_map;
340
341 free_unused_memmap(&meminfo);
342
343
344 free_all_bootmem();
345
346 mem_init_print_info(NULL);
347 printk(KERN_NOTICE "Virtual kernel memory layout:\n"
348 " vector : 0x%08lx - 0x%08lx (%4ld kB)\n"
349 " vmalloc : 0x%08lx - 0x%08lx (%4ld MB)\n"
350 " lowmem : 0x%08lx - 0x%08lx (%4ld MB)\n"
351 " modules : 0x%08lx - 0x%08lx (%4ld MB)\n"
352 " .init : 0x%p" " - 0x%p" " (%4d kB)\n"
353 " .text : 0x%p" " - 0x%p" " (%4d kB)\n"
354 " .data : 0x%p" " - 0x%p" " (%4d kB)\n",
355
356 VECTORS_BASE, VECTORS_BASE + PAGE_SIZE,
357 DIV_ROUND_UP(PAGE_SIZE, SZ_1K),
358 VMALLOC_START, VMALLOC_END,
359 DIV_ROUND_UP((VMALLOC_END - VMALLOC_START), SZ_1M),
360 PAGE_OFFSET, (unsigned long)high_memory,
361 DIV_ROUND_UP(((unsigned long)high_memory - PAGE_OFFSET), SZ_1M),
362 MODULES_VADDR, MODULES_END,
363 DIV_ROUND_UP((MODULES_END - MODULES_VADDR), SZ_1M),
364
365 __init_begin, __init_end,
366 DIV_ROUND_UP((__init_end - __init_begin), SZ_1K),
367 _stext, _etext,
368 DIV_ROUND_UP((_etext - _stext), SZ_1K),
369 _sdata, _edata,
370 DIV_ROUND_UP((_edata - _sdata), SZ_1K));
371
372 BUILD_BUG_ON(TASK_SIZE > MODULES_VADDR);
373 BUG_ON(TASK_SIZE > MODULES_VADDR);
374
375 if (PAGE_SIZE >= 16384 && get_num_physpages() <= 128) {
376
377
378
379
380
381 sysctl_overcommit_memory = OVERCOMMIT_ALWAYS;
382 }
383}
384
385void free_initmem(void)
386{
387 free_initmem_default(-1);
388}
389
390#ifdef CONFIG_BLK_DEV_INITRD
391
392static int keep_initrd;
393
394void free_initrd_mem(unsigned long start, unsigned long end)
395{
396 if (!keep_initrd)
397 free_reserved_area((void *)start, (void *)end, -1, "initrd");
398}
399
400static int __init keepinitrd_setup(char *__unused)
401{
402 keep_initrd = 1;
403 return 1;
404}
405
406__setup("keepinitrd", keepinitrd_setup);
407#endif
408