1 /*
2 * linux/arch/unicore32/mm/init.c
3 *
4 * Copyright (C) 2010 GUAN Xue-tao
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 */
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
34 static unsigned long phys_initrd_start __initdata = 0x01000000;
35 static unsigned long phys_initrd_size __initdata = SZ_8M;
36
early_initrd(char * p)37 static 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 }
51 early_param("initrd", early_initrd);
52
53 /*
54 * This keeps memory configuration data used by a couple memory
55 * initialization functions, as well as show_mem() for the skipping
56 * of holes in the memory map. It is populated by uc32_add_memory().
57 */
58 struct meminfo meminfo;
59
show_mem(unsigned int filter)60 void show_mem(unsigned int filter)
61 {
62 int free = 0, total = 0, reserved = 0;
63 int shared = 0, cached = 0, slab = 0, i;
64 struct meminfo *mi = &meminfo;
65
66 printk(KERN_DEFAULT "Mem-info:\n");
67 show_free_areas(filter);
68
69 for_each_bank(i, mi) {
70 struct membank *bank = &mi->bank[i];
71 unsigned int pfn1, pfn2;
72 struct page *page, *end;
73
74 pfn1 = bank_pfn_start(bank);
75 pfn2 = bank_pfn_end(bank);
76
77 page = pfn_to_page(pfn1);
78 end = pfn_to_page(pfn2 - 1) + 1;
79
80 do {
81 total++;
82 if (PageReserved(page))
83 reserved++;
84 else if (PageSwapCache(page))
85 cached++;
86 else if (PageSlab(page))
87 slab++;
88 else if (!page_count(page))
89 free++;
90 else
91 shared += page_count(page) - 1;
92 page++;
93 } while (page < end);
94 }
95
96 printk(KERN_DEFAULT "%d pages of RAM\n", total);
97 printk(KERN_DEFAULT "%d free pages\n", free);
98 printk(KERN_DEFAULT "%d reserved pages\n", reserved);
99 printk(KERN_DEFAULT "%d slab pages\n", slab);
100 printk(KERN_DEFAULT "%d pages shared\n", shared);
101 printk(KERN_DEFAULT "%d pages swap cached\n", cached);
102 }
103
find_limits(unsigned long * min,unsigned long * max_low,unsigned long * max_high)104 static void __init find_limits(unsigned long *min, unsigned long *max_low,
105 unsigned long *max_high)
106 {
107 struct meminfo *mi = &meminfo;
108 int i;
109
110 *min = -1UL;
111 *max_low = *max_high = 0;
112
113 for_each_bank(i, mi) {
114 struct membank *bank = &mi->bank[i];
115 unsigned long start, end;
116
117 start = bank_pfn_start(bank);
118 end = bank_pfn_end(bank);
119
120 if (*min > start)
121 *min = start;
122 if (*max_high < end)
123 *max_high = end;
124 if (bank->highmem)
125 continue;
126 if (*max_low < end)
127 *max_low = end;
128 }
129 }
130
uc32_bootmem_init(unsigned long start_pfn,unsigned long end_pfn)131 static void __init uc32_bootmem_init(unsigned long start_pfn,
132 unsigned long end_pfn)
133 {
134 struct memblock_region *reg;
135 unsigned int boot_pages;
136 phys_addr_t bitmap;
137 pg_data_t *pgdat;
138
139 /*
140 * Allocate the bootmem bitmap page. This must be in a region
141 * of memory which has already been mapped.
142 */
143 boot_pages = bootmem_bootmap_pages(end_pfn - start_pfn);
144 bitmap = memblock_alloc_base(boot_pages << PAGE_SHIFT, L1_CACHE_BYTES,
145 __pfn_to_phys(end_pfn));
146
147 /*
148 * Initialise the bootmem allocator, handing the
149 * memory banks over to bootmem.
150 */
151 node_set_online(0);
152 pgdat = NODE_DATA(0);
153 init_bootmem_node(pgdat, __phys_to_pfn(bitmap), start_pfn, end_pfn);
154
155 /* Free the lowmem regions from memblock into bootmem. */
156 for_each_memblock(memory, reg) {
157 unsigned long start = memblock_region_memory_base_pfn(reg);
158 unsigned long end = memblock_region_memory_end_pfn(reg);
159
160 if (end >= end_pfn)
161 end = end_pfn;
162 if (start >= end)
163 break;
164
165 free_bootmem(__pfn_to_phys(start), (end - start) << PAGE_SHIFT);
166 }
167
168 /* Reserve the lowmem memblock reserved regions in bootmem. */
169 for_each_memblock(reserved, reg) {
170 unsigned long start = memblock_region_reserved_base_pfn(reg);
171 unsigned long end = memblock_region_reserved_end_pfn(reg);
172
173 if (end >= end_pfn)
174 end = end_pfn;
175 if (start >= end)
176 break;
177
178 reserve_bootmem(__pfn_to_phys(start),
179 (end - start) << PAGE_SHIFT, BOOTMEM_DEFAULT);
180 }
181 }
182
uc32_bootmem_free(unsigned long min,unsigned long max_low,unsigned long max_high)183 static void __init uc32_bootmem_free(unsigned long min, unsigned long max_low,
184 unsigned long max_high)
185 {
186 unsigned long zone_size[MAX_NR_ZONES], zhole_size[MAX_NR_ZONES];
187 struct memblock_region *reg;
188
189 /*
190 * initialise the zones.
191 */
192 memset(zone_size, 0, sizeof(zone_size));
193
194 /*
195 * The memory size has already been determined. If we need
196 * to do anything fancy with the allocation of this memory
197 * to the zones, now is the time to do it.
198 */
199 zone_size[0] = max_low - min;
200
201 /*
202 * Calculate the size of the holes.
203 * holes = node_size - sum(bank_sizes)
204 */
205 memcpy(zhole_size, zone_size, sizeof(zhole_size));
206 for_each_memblock(memory, reg) {
207 unsigned long start = memblock_region_memory_base_pfn(reg);
208 unsigned long end = memblock_region_memory_end_pfn(reg);
209
210 if (start < max_low) {
211 unsigned long low_end = min(end, max_low);
212 zhole_size[0] -= low_end - start;
213 }
214 }
215
216 /*
217 * Adjust the sizes according to any special requirements for
218 * this machine type.
219 */
220 arch_adjust_zones(zone_size, zhole_size);
221
222 free_area_init_node(0, zone_size, min, zhole_size);
223 }
224
pfn_valid(unsigned long pfn)225 int pfn_valid(unsigned long pfn)
226 {
227 return memblock_is_memory(pfn << PAGE_SHIFT);
228 }
229 EXPORT_SYMBOL(pfn_valid);
230
uc32_memory_present(void)231 static void uc32_memory_present(void)
232 {
233 }
234
meminfo_cmp(const void * _a,const void * _b)235 static int __init meminfo_cmp(const void *_a, const void *_b)
236 {
237 const struct membank *a = _a, *b = _b;
238 long cmp = bank_pfn_start(a) - bank_pfn_start(b);
239 return cmp < 0 ? -1 : cmp > 0 ? 1 : 0;
240 }
241
uc32_memblock_init(struct meminfo * mi)242 void __init uc32_memblock_init(struct meminfo *mi)
243 {
244 int i;
245
246 sort(&meminfo.bank, meminfo.nr_banks, sizeof(meminfo.bank[0]),
247 meminfo_cmp, NULL);
248
249 for (i = 0; i < mi->nr_banks; i++)
250 memblock_add(mi->bank[i].start, mi->bank[i].size);
251
252 /* Register the kernel text, kernel data and initrd with memblock. */
253 memblock_reserve(__pa(_text), _end - _text);
254
255 #ifdef CONFIG_BLK_DEV_INITRD
256 if (phys_initrd_size) {
257 memblock_reserve(phys_initrd_start, phys_initrd_size);
258
259 /* Now convert initrd to virtual addresses */
260 initrd_start = __phys_to_virt(phys_initrd_start);
261 initrd_end = initrd_start + phys_initrd_size;
262 }
263 #endif
264
265 uc32_mm_memblock_reserve();
266
267 memblock_allow_resize();
268 memblock_dump_all();
269 }
270
bootmem_init(void)271 void __init bootmem_init(void)
272 {
273 unsigned long min, max_low, max_high;
274
275 max_low = max_high = 0;
276
277 find_limits(&min, &max_low, &max_high);
278
279 uc32_bootmem_init(min, max_low);
280
281 #ifdef CONFIG_SWIOTLB
282 swiotlb_init(1);
283 #endif
284 /*
285 * Sparsemem tries to allocate bootmem in memory_present(),
286 * so must be done after the fixed reservations
287 */
288 uc32_memory_present();
289
290 /*
291 * sparse_init() needs the bootmem allocator up and running.
292 */
293 sparse_init();
294
295 /*
296 * Now free the memory - free_area_init_node needs
297 * the sparse mem_map arrays initialized by sparse_init()
298 * for memmap_init_zone(), otherwise all PFNs are invalid.
299 */
300 uc32_bootmem_free(min, max_low, max_high);
301
302 high_memory = __va((max_low << PAGE_SHIFT) - 1) + 1;
303
304 /*
305 * This doesn't seem to be used by the Linux memory manager any
306 * more, but is used by ll_rw_block. If we can get rid of it, we
307 * also get rid of some of the stuff above as well.
308 *
309 * Note: max_low_pfn and max_pfn reflect the number of _pages_ in
310 * the system, not the maximum PFN.
311 */
312 max_low_pfn = max_low - PHYS_PFN_OFFSET;
313 max_pfn = max_high - PHYS_PFN_OFFSET;
314 }
315
free_area(unsigned long pfn,unsigned long end,char * s)316 static inline int free_area(unsigned long pfn, unsigned long end, char *s)
317 {
318 unsigned int pages = 0, size = (end - pfn) << (PAGE_SHIFT - 10);
319
320 for (; pfn < end; pfn++) {
321 struct page *page = pfn_to_page(pfn);
322 ClearPageReserved(page);
323 init_page_count(page);
324 __free_page(page);
325 pages++;
326 }
327
328 if (size && s)
329 printk(KERN_INFO "Freeing %s memory: %dK\n", s, size);
330
331 return pages;
332 }
333
334 static inline void
free_memmap(unsigned long start_pfn,unsigned long end_pfn)335 free_memmap(unsigned long start_pfn, unsigned long end_pfn)
336 {
337 struct page *start_pg, *end_pg;
338 unsigned long pg, pgend;
339
340 /*
341 * Convert start_pfn/end_pfn to a struct page pointer.
342 */
343 start_pg = pfn_to_page(start_pfn - 1) + 1;
344 end_pg = pfn_to_page(end_pfn);
345
346 /*
347 * Convert to physical addresses, and
348 * round start upwards and end downwards.
349 */
350 pg = PAGE_ALIGN(__pa(start_pg));
351 pgend = __pa(end_pg) & PAGE_MASK;
352
353 /*
354 * If there are free pages between these,
355 * free the section of the memmap array.
356 */
357 if (pg < pgend)
358 free_bootmem(pg, pgend - pg);
359 }
360
361 /*
362 * The mem_map array can get very big. Free the unused area of the memory map.
363 */
free_unused_memmap(struct meminfo * mi)364 static void __init free_unused_memmap(struct meminfo *mi)
365 {
366 unsigned long bank_start, prev_bank_end = 0;
367 unsigned int i;
368
369 /*
370 * This relies on each bank being in address order.
371 * The banks are sorted previously in bootmem_init().
372 */
373 for_each_bank(i, mi) {
374 struct membank *bank = &mi->bank[i];
375
376 bank_start = bank_pfn_start(bank);
377
378 /*
379 * If we had a previous bank, and there is a space
380 * between the current bank and the previous, free it.
381 */
382 if (prev_bank_end && prev_bank_end < bank_start)
383 free_memmap(prev_bank_end, bank_start);
384
385 /*
386 * Align up here since the VM subsystem insists that the
387 * memmap entries are valid from the bank end aligned to
388 * MAX_ORDER_NR_PAGES.
389 */
390 prev_bank_end = ALIGN(bank_pfn_end(bank), MAX_ORDER_NR_PAGES);
391 }
392 }
393
394 /*
395 * mem_init() marks the free areas in the mem_map and tells us how much
396 * memory is free. This is done after various parts of the system have
397 * claimed their memory after the kernel image.
398 */
mem_init(void)399 void __init mem_init(void)
400 {
401 unsigned long reserved_pages, free_pages;
402 struct memblock_region *reg;
403 int i;
404
405 max_mapnr = pfn_to_page(max_pfn + PHYS_PFN_OFFSET) - mem_map;
406
407 /* this will put all unused low memory onto the freelists */
408 free_unused_memmap(&meminfo);
409
410 totalram_pages += free_all_bootmem();
411
412 reserved_pages = free_pages = 0;
413
414 for_each_bank(i, &meminfo) {
415 struct membank *bank = &meminfo.bank[i];
416 unsigned int pfn1, pfn2;
417 struct page *page, *end;
418
419 pfn1 = bank_pfn_start(bank);
420 pfn2 = bank_pfn_end(bank);
421
422 page = pfn_to_page(pfn1);
423 end = pfn_to_page(pfn2 - 1) + 1;
424
425 do {
426 if (PageReserved(page))
427 reserved_pages++;
428 else if (!page_count(page))
429 free_pages++;
430 page++;
431 } while (page < end);
432 }
433
434 /*
435 * Since our memory may not be contiguous, calculate the
436 * real number of pages we have in this system
437 */
438 printk(KERN_INFO "Memory:");
439 num_physpages = 0;
440 for_each_memblock(memory, reg) {
441 unsigned long pages = memblock_region_memory_end_pfn(reg) -
442 memblock_region_memory_base_pfn(reg);
443 num_physpages += pages;
444 printk(" %ldMB", pages >> (20 - PAGE_SHIFT));
445 }
446 printk(" = %luMB total\n", num_physpages >> (20 - PAGE_SHIFT));
447
448 printk(KERN_NOTICE "Memory: %luk/%luk available, %luk reserved, %luK highmem\n",
449 nr_free_pages() << (PAGE_SHIFT-10),
450 free_pages << (PAGE_SHIFT-10),
451 reserved_pages << (PAGE_SHIFT-10),
452 totalhigh_pages << (PAGE_SHIFT-10));
453
454 printk(KERN_NOTICE "Virtual kernel memory layout:\n"
455 " vector : 0x%08lx - 0x%08lx (%4ld kB)\n"
456 " vmalloc : 0x%08lx - 0x%08lx (%4ld MB)\n"
457 " lowmem : 0x%08lx - 0x%08lx (%4ld MB)\n"
458 " modules : 0x%08lx - 0x%08lx (%4ld MB)\n"
459 " .init : 0x%p" " - 0x%p" " (%4d kB)\n"
460 " .text : 0x%p" " - 0x%p" " (%4d kB)\n"
461 " .data : 0x%p" " - 0x%p" " (%4d kB)\n",
462
463 VECTORS_BASE, VECTORS_BASE + PAGE_SIZE,
464 DIV_ROUND_UP(PAGE_SIZE, SZ_1K),
465 VMALLOC_START, VMALLOC_END,
466 DIV_ROUND_UP((VMALLOC_END - VMALLOC_START), SZ_1M),
467 PAGE_OFFSET, (unsigned long)high_memory,
468 DIV_ROUND_UP(((unsigned long)high_memory - PAGE_OFFSET), SZ_1M),
469 MODULES_VADDR, MODULES_END,
470 DIV_ROUND_UP((MODULES_END - MODULES_VADDR), SZ_1M),
471
472 __init_begin, __init_end,
473 DIV_ROUND_UP((__init_end - __init_begin), SZ_1K),
474 _stext, _etext,
475 DIV_ROUND_UP((_etext - _stext), SZ_1K),
476 _sdata, _edata,
477 DIV_ROUND_UP((_edata - _sdata), SZ_1K));
478
479 BUILD_BUG_ON(TASK_SIZE > MODULES_VADDR);
480 BUG_ON(TASK_SIZE > MODULES_VADDR);
481
482 if (PAGE_SIZE >= 16384 && num_physpages <= 128) {
483 /*
484 * On a machine this small we won't get
485 * anywhere without overcommit, so turn
486 * it on by default.
487 */
488 sysctl_overcommit_memory = OVERCOMMIT_ALWAYS;
489 }
490 }
491
free_initmem(void)492 void free_initmem(void)
493 {
494 totalram_pages += free_area(__phys_to_pfn(__pa(__init_begin)),
495 __phys_to_pfn(__pa(__init_end)),
496 "init");
497 }
498
499 #ifdef CONFIG_BLK_DEV_INITRD
500
501 static int keep_initrd;
502
free_initrd_mem(unsigned long start,unsigned long end)503 void free_initrd_mem(unsigned long start, unsigned long end)
504 {
505 if (!keep_initrd)
506 totalram_pages += free_area(__phys_to_pfn(__pa(start)),
507 __phys_to_pfn(__pa(end)),
508 "initrd");
509 }
510
keepinitrd_setup(char * __unused)511 static int __init keepinitrd_setup(char *__unused)
512 {
513 keep_initrd = 1;
514 return 1;
515 }
516
517 __setup("keepinitrd", keepinitrd_setup);
518 #endif
519