2 * linux/arch/unicore32/mm/init.c
4 * Copyright (C) 2010 GUAN Xue-tao
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.
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>
25 #include <asm/sections.h>
26 #include <asm/setup.h>
27 #include <asm/sizes.h>
33 static unsigned long phys_initrd_start __initdata = 0x01000000;
34 static unsigned long phys_initrd_size __initdata = SZ_8M;
36 static int __init early_initrd(char *p)
38 unsigned long start, size;
41 start = memparse(p, &endp);
43 size = memparse(endp + 1, NULL);
45 phys_initrd_start = start;
46 phys_initrd_size = size;
50 early_param("initrd", early_initrd);
53 * This keeps memory configuration data used by a couple memory
54 * initialization functions, as well as show_mem() for the skipping
55 * of holes in the memory map. It is populated by uc32_add_memory().
57 struct meminfo meminfo;
59 void show_mem(unsigned int filter)
61 int free = 0, total = 0, reserved = 0;
62 int shared = 0, cached = 0, slab = 0, i;
63 struct meminfo *mi = &meminfo;
65 printk(KERN_DEFAULT "Mem-info:\n");
66 show_free_areas(filter);
68 if (filter & SHOW_MEM_FILTER_PAGE_COUNT)
71 for_each_bank(i, mi) {
72 struct membank *bank = &mi->bank[i];
73 unsigned int pfn1, pfn2;
74 struct page *page, *end;
76 pfn1 = bank_pfn_start(bank);
77 pfn2 = bank_pfn_end(bank);
79 page = pfn_to_page(pfn1);
80 end = pfn_to_page(pfn2 - 1) + 1;
84 if (PageReserved(page))
86 else if (PageSwapCache(page))
88 else if (PageSlab(page))
90 else if (!page_count(page))
93 shared += page_count(page) - 1;
98 printk(KERN_DEFAULT "%d pages of RAM\n", total);
99 printk(KERN_DEFAULT "%d free pages\n", free);
100 printk(KERN_DEFAULT "%d reserved pages\n", reserved);
101 printk(KERN_DEFAULT "%d slab pages\n", slab);
102 printk(KERN_DEFAULT "%d pages shared\n", shared);
103 printk(KERN_DEFAULT "%d pages swap cached\n", cached);
106 static void __init find_limits(unsigned long *min, unsigned long *max_low,
107 unsigned long *max_high)
109 struct meminfo *mi = &meminfo;
113 *max_low = *max_high = 0;
115 for_each_bank(i, mi) {
116 struct membank *bank = &mi->bank[i];
117 unsigned long start, end;
119 start = bank_pfn_start(bank);
120 end = bank_pfn_end(bank);
133 static void __init uc32_bootmem_init(unsigned long start_pfn,
134 unsigned long end_pfn)
136 struct memblock_region *reg;
137 unsigned int boot_pages;
142 * Allocate the bootmem bitmap page. This must be in a region
143 * of memory which has already been mapped.
145 boot_pages = bootmem_bootmap_pages(end_pfn - start_pfn);
146 bitmap = memblock_alloc_base(boot_pages << PAGE_SHIFT, L1_CACHE_BYTES,
147 __pfn_to_phys(end_pfn));
150 * Initialise the bootmem allocator, handing the
151 * memory banks over to bootmem.
154 pgdat = NODE_DATA(0);
155 init_bootmem_node(pgdat, __phys_to_pfn(bitmap), start_pfn, end_pfn);
157 /* Free the lowmem regions from memblock into bootmem. */
158 for_each_memblock(memory, reg) {
159 unsigned long start = memblock_region_memory_base_pfn(reg);
160 unsigned long end = memblock_region_memory_end_pfn(reg);
167 free_bootmem(__pfn_to_phys(start), (end - start) << PAGE_SHIFT);
170 /* Reserve the lowmem memblock reserved regions in bootmem. */
171 for_each_memblock(reserved, reg) {
172 unsigned long start = memblock_region_reserved_base_pfn(reg);
173 unsigned long end = memblock_region_reserved_end_pfn(reg);
180 reserve_bootmem(__pfn_to_phys(start),
181 (end - start) << PAGE_SHIFT, BOOTMEM_DEFAULT);
185 static void __init uc32_bootmem_free(unsigned long min, unsigned long max_low,
186 unsigned long max_high)
188 unsigned long zone_size[MAX_NR_ZONES], zhole_size[MAX_NR_ZONES];
189 struct memblock_region *reg;
192 * initialise the zones.
194 memset(zone_size, 0, sizeof(zone_size));
197 * The memory size has already been determined. If we need
198 * to do anything fancy with the allocation of this memory
199 * to the zones, now is the time to do it.
201 zone_size[0] = max_low - min;
204 * Calculate the size of the holes.
205 * holes = node_size - sum(bank_sizes)
207 memcpy(zhole_size, zone_size, sizeof(zhole_size));
208 for_each_memblock(memory, reg) {
209 unsigned long start = memblock_region_memory_base_pfn(reg);
210 unsigned long end = memblock_region_memory_end_pfn(reg);
212 if (start < max_low) {
213 unsigned long low_end = min(end, max_low);
214 zhole_size[0] -= low_end - start;
219 * Adjust the sizes according to any special requirements for
222 arch_adjust_zones(zone_size, zhole_size);
224 free_area_init_node(0, zone_size, min, zhole_size);
227 int pfn_valid(unsigned long pfn)
229 return memblock_is_memory(pfn << PAGE_SHIFT);
231 EXPORT_SYMBOL(pfn_valid);
233 static void uc32_memory_present(void)
237 static int __init meminfo_cmp(const void *_a, const void *_b)
239 const struct membank *a = _a, *b = _b;
240 long cmp = bank_pfn_start(a) - bank_pfn_start(b);
241 return cmp < 0 ? -1 : cmp > 0 ? 1 : 0;
244 void __init uc32_memblock_init(struct meminfo *mi)
248 sort(&meminfo.bank, meminfo.nr_banks, sizeof(meminfo.bank[0]),
252 for (i = 0; i < mi->nr_banks; i++)
253 memblock_add(mi->bank[i].start, mi->bank[i].size);
255 /* Register the kernel text, kernel data and initrd with memblock. */
256 memblock_reserve(__pa(_text), _end - _text);
258 #ifdef CONFIG_BLK_DEV_INITRD
259 if (phys_initrd_size) {
260 memblock_reserve(phys_initrd_start, phys_initrd_size);
262 /* Now convert initrd to virtual addresses */
263 initrd_start = __phys_to_virt(phys_initrd_start);
264 initrd_end = initrd_start + phys_initrd_size;
268 uc32_mm_memblock_reserve();
274 void __init bootmem_init(void)
276 unsigned long min, max_low, max_high;
278 max_low = max_high = 0;
280 find_limits(&min, &max_low, &max_high);
282 uc32_bootmem_init(min, max_low);
284 #ifdef CONFIG_SWIOTLB
288 * Sparsemem tries to allocate bootmem in memory_present(),
289 * so must be done after the fixed reservations
291 uc32_memory_present();
294 * sparse_init() needs the bootmem allocator up and running.
299 * Now free the memory - free_area_init_node needs
300 * the sparse mem_map arrays initialized by sparse_init()
301 * for memmap_init_zone(), otherwise all PFNs are invalid.
303 uc32_bootmem_free(min, max_low, max_high);
305 high_memory = __va((max_low << PAGE_SHIFT) - 1) + 1;
308 * This doesn't seem to be used by the Linux memory manager any
309 * more, but is used by ll_rw_block. If we can get rid of it, we
310 * also get rid of some of the stuff above as well.
312 * Note: max_low_pfn and max_pfn reflect the number of _pages_ in
313 * the system, not the maximum PFN.
315 max_low_pfn = max_low - PHYS_PFN_OFFSET;
316 max_pfn = max_high - PHYS_PFN_OFFSET;
319 static inline int free_area(unsigned long pfn, unsigned long end, char *s)
321 unsigned int pages = 0, size = (end - pfn) << (PAGE_SHIFT - 10);
323 for (; pfn < end; pfn++) {
324 struct page *page = pfn_to_page(pfn);
325 ClearPageReserved(page);
326 init_page_count(page);
332 printk(KERN_INFO "Freeing %s memory: %dK\n", s, size);
338 free_memmap(unsigned long start_pfn, unsigned long end_pfn)
340 struct page *start_pg, *end_pg;
341 unsigned long pg, pgend;
344 * Convert start_pfn/end_pfn to a struct page pointer.
346 start_pg = pfn_to_page(start_pfn - 1) + 1;
347 end_pg = pfn_to_page(end_pfn);
350 * Convert to physical addresses, and
351 * round start upwards and end downwards.
353 pg = PAGE_ALIGN(__pa(start_pg));
354 pgend = __pa(end_pg) & PAGE_MASK;
357 * If there are free pages between these,
358 * free the section of the memmap array.
361 free_bootmem(pg, pgend - pg);
365 * The mem_map array can get very big. Free the unused area of the memory map.
367 static void __init free_unused_memmap(struct meminfo *mi)
369 unsigned long bank_start, prev_bank_end = 0;
373 * This relies on each bank being in address order.
374 * The banks are sorted previously in bootmem_init().
376 for_each_bank(i, mi) {
377 struct membank *bank = &mi->bank[i];
379 bank_start = bank_pfn_start(bank);
382 * If we had a previous bank, and there is a space
383 * between the current bank and the previous, free it.
385 if (prev_bank_end && prev_bank_end < bank_start)
386 free_memmap(prev_bank_end, bank_start);
389 * Align up here since the VM subsystem insists that the
390 * memmap entries are valid from the bank end aligned to
391 * MAX_ORDER_NR_PAGES.
393 prev_bank_end = ALIGN(bank_pfn_end(bank), MAX_ORDER_NR_PAGES);
398 * mem_init() marks the free areas in the mem_map and tells us how much
399 * memory is free. This is done after various parts of the system have
400 * claimed their memory after the kernel image.
402 void __init mem_init(void)
404 unsigned long reserved_pages, free_pages;
405 struct memblock_region *reg;
408 max_mapnr = pfn_to_page(max_pfn + PHYS_PFN_OFFSET) - mem_map;
410 /* this will put all unused low memory onto the freelists */
411 free_unused_memmap(&meminfo);
413 totalram_pages += free_all_bootmem();
415 reserved_pages = free_pages = 0;
417 for_each_bank(i, &meminfo) {
418 struct membank *bank = &meminfo.bank[i];
419 unsigned int pfn1, pfn2;
420 struct page *page, *end;
422 pfn1 = bank_pfn_start(bank);
423 pfn2 = bank_pfn_end(bank);
425 page = pfn_to_page(pfn1);
426 end = pfn_to_page(pfn2 - 1) + 1;
429 if (PageReserved(page))
431 else if (!page_count(page))
434 } while (page < end);
438 * Since our memory may not be contiguous, calculate the
439 * real number of pages we have in this system
441 printk(KERN_INFO "Memory:");
443 for_each_memblock(memory, reg) {
444 unsigned long pages = memblock_region_memory_end_pfn(reg) -
445 memblock_region_memory_base_pfn(reg);
446 num_physpages += pages;
447 printk(" %ldMB", pages >> (20 - PAGE_SHIFT));
449 printk(" = %luMB total\n", num_physpages >> (20 - PAGE_SHIFT));
451 printk(KERN_NOTICE "Memory: %luk/%luk available, %luk reserved, %luK highmem\n",
452 nr_free_pages() << (PAGE_SHIFT-10),
453 free_pages << (PAGE_SHIFT-10),
454 reserved_pages << (PAGE_SHIFT-10),
455 totalhigh_pages << (PAGE_SHIFT-10));
457 printk(KERN_NOTICE "Virtual kernel memory layout:\n"
458 " vector : 0x%08lx - 0x%08lx (%4ld kB)\n"
459 " vmalloc : 0x%08lx - 0x%08lx (%4ld MB)\n"
460 " lowmem : 0x%08lx - 0x%08lx (%4ld MB)\n"
461 " modules : 0x%08lx - 0x%08lx (%4ld MB)\n"
462 " .init : 0x%p" " - 0x%p" " (%4d kB)\n"
463 " .text : 0x%p" " - 0x%p" " (%4d kB)\n"
464 " .data : 0x%p" " - 0x%p" " (%4d kB)\n",
466 VECTORS_BASE, VECTORS_BASE + PAGE_SIZE,
467 DIV_ROUND_UP(PAGE_SIZE, SZ_1K),
468 VMALLOC_START, VMALLOC_END,
469 DIV_ROUND_UP((VMALLOC_END - VMALLOC_START), SZ_1M),
470 PAGE_OFFSET, (unsigned long)high_memory,
471 DIV_ROUND_UP(((unsigned long)high_memory - PAGE_OFFSET), SZ_1M),
472 MODULES_VADDR, MODULES_END,
473 DIV_ROUND_UP((MODULES_END - MODULES_VADDR), SZ_1M),
475 __init_begin, __init_end,
476 DIV_ROUND_UP((__init_end - __init_begin), SZ_1K),
478 DIV_ROUND_UP((_etext - _stext), SZ_1K),
480 DIV_ROUND_UP((_edata - _sdata), SZ_1K));
482 BUILD_BUG_ON(TASK_SIZE > MODULES_VADDR);
483 BUG_ON(TASK_SIZE > MODULES_VADDR);
485 if (PAGE_SIZE >= 16384 && num_physpages <= 128) {
487 * On a machine this small we won't get
488 * anywhere without overcommit, so turn
491 sysctl_overcommit_memory = OVERCOMMIT_ALWAYS;
495 void free_initmem(void)
497 totalram_pages += free_area(__phys_to_pfn(__pa(__init_begin)),
498 __phys_to_pfn(__pa(__init_end)),
502 #ifdef CONFIG_BLK_DEV_INITRD
504 static int keep_initrd;
506 void free_initrd_mem(unsigned long start, unsigned long end)
509 totalram_pages += free_area(__phys_to_pfn(__pa(start)),
510 __phys_to_pfn(__pa(end)),
514 static int __init keepinitrd_setup(char *__unused)
520 __setup("keepinitrd", keepinitrd_setup);