11da177e4SLinus Torvalds /* 21da177e4SLinus Torvalds * linux/arch/arm/mm/init.c 31da177e4SLinus Torvalds * 490072059SRussell King * Copyright (C) 1995-2005 Russell King 51da177e4SLinus Torvalds * 61da177e4SLinus Torvalds * This program is free software; you can redistribute it and/or modify 71da177e4SLinus Torvalds * it under the terms of the GNU General Public License version 2 as 81da177e4SLinus Torvalds * published by the Free Software Foundation. 91da177e4SLinus Torvalds */ 101da177e4SLinus Torvalds #include <linux/kernel.h> 111da177e4SLinus Torvalds #include <linux/errno.h> 121da177e4SLinus Torvalds #include <linux/swap.h> 131da177e4SLinus Torvalds #include <linux/init.h> 141da177e4SLinus Torvalds #include <linux/bootmem.h> 151da177e4SLinus Torvalds #include <linux/mman.h> 161da177e4SLinus Torvalds #include <linux/nodemask.h> 171da177e4SLinus Torvalds #include <linux/initrd.h> 18b7cfda9fSRussell King #include <linux/sort.h> 193835f6cbSNicolas Pitre #include <linux/highmem.h> 205a0e3ad6STejun Heo #include <linux/gfp.h> 211da177e4SLinus Torvalds 221da177e4SLinus Torvalds #include <asm/mach-types.h> 2337efe642SRussell King #include <asm/sections.h> 241da177e4SLinus Torvalds #include <asm/setup.h> 2574d02fb9SRussell King #include <asm/sizes.h> 261da177e4SLinus Torvalds #include <asm/tlb.h> 27db9ef1afSFenkart/Bostandzhyan #include <asm/fixmap.h> 281da177e4SLinus Torvalds 291da177e4SLinus Torvalds #include <asm/mach/arch.h> 301da177e4SLinus Torvalds #include <asm/mach/map.h> 311da177e4SLinus Torvalds 321b2e2b73SRussell King #include "mm.h" 331b2e2b73SRussell King 34012d1f4aSRussell King static unsigned long phys_initrd_start __initdata = 0; 35012d1f4aSRussell King static unsigned long phys_initrd_size __initdata = 0; 36012d1f4aSRussell King 372b0d8c25SJeremy Kerr static int __init early_initrd(char *p) 38012d1f4aSRussell King { 39012d1f4aSRussell King unsigned long start, size; 402b0d8c25SJeremy Kerr char *endp; 41012d1f4aSRussell King 422b0d8c25SJeremy Kerr start = memparse(p, &endp); 432b0d8c25SJeremy Kerr if (*endp == ',') { 442b0d8c25SJeremy Kerr size = memparse(endp + 1, NULL); 45012d1f4aSRussell King 46012d1f4aSRussell King phys_initrd_start = start; 47012d1f4aSRussell King phys_initrd_size = size; 48012d1f4aSRussell King } 492b0d8c25SJeremy Kerr return 0; 50012d1f4aSRussell King } 512b0d8c25SJeremy Kerr early_param("initrd", early_initrd); 52012d1f4aSRussell King 53012d1f4aSRussell King static int __init parse_tag_initrd(const struct tag *tag) 54012d1f4aSRussell King { 55012d1f4aSRussell King printk(KERN_WARNING "ATAG_INITRD is deprecated; " 56012d1f4aSRussell King "please update your bootloader.\n"); 57012d1f4aSRussell King phys_initrd_start = __virt_to_phys(tag->u.initrd.start); 58012d1f4aSRussell King phys_initrd_size = tag->u.initrd.size; 59012d1f4aSRussell King return 0; 60012d1f4aSRussell King } 61012d1f4aSRussell King 62012d1f4aSRussell King __tagtable(ATAG_INITRD, parse_tag_initrd); 63012d1f4aSRussell King 64012d1f4aSRussell King static int __init parse_tag_initrd2(const struct tag *tag) 65012d1f4aSRussell King { 66012d1f4aSRussell King phys_initrd_start = tag->u.initrd.start; 67012d1f4aSRussell King phys_initrd_size = tag->u.initrd.size; 68012d1f4aSRussell King return 0; 69012d1f4aSRussell King } 70012d1f4aSRussell King 71012d1f4aSRussell King __tagtable(ATAG_INITRD2, parse_tag_initrd2); 721da177e4SLinus Torvalds 731da177e4SLinus Torvalds /* 744b5f32ceSNicolas Pitre * This keeps memory configuration data used by a couple memory 754b5f32ceSNicolas Pitre * initialization functions, as well as show_mem() for the skipping 764b5f32ceSNicolas Pitre * of holes in the memory map. It is populated by arm_add_memory(). 771da177e4SLinus Torvalds */ 784b5f32ceSNicolas Pitre struct meminfo meminfo; 795e709827SRay Lehtiniemi 801da177e4SLinus Torvalds void show_mem(void) 811da177e4SLinus Torvalds { 821da177e4SLinus Torvalds int free = 0, total = 0, reserved = 0; 835e709827SRay Lehtiniemi int shared = 0, cached = 0, slab = 0, node, i; 845e709827SRay Lehtiniemi struct meminfo * mi = &meminfo; 851da177e4SLinus Torvalds 861da177e4SLinus Torvalds printk("Mem-info:\n"); 871da177e4SLinus Torvalds show_free_areas(); 881da177e4SLinus Torvalds for_each_online_node(node) { 89204ecae4SRussell King pg_data_t *n = NODE_DATA(node); 90b7a69ac3SRussell King struct page *map = pgdat_page_nr(n, 0) - n->node_start_pfn; 91204ecae4SRussell King 925e709827SRay Lehtiniemi for_each_nodebank (i,mi,node) { 93d2a38ef9SRussell King struct membank *bank = &mi->bank[i]; 945e709827SRay Lehtiniemi unsigned int pfn1, pfn2; 951da177e4SLinus Torvalds struct page *page, *end; 961da177e4SLinus Torvalds 97d2a38ef9SRussell King pfn1 = bank_pfn_start(bank); 98d2a38ef9SRussell King pfn2 = bank_pfn_end(bank); 995e709827SRay Lehtiniemi 100204ecae4SRussell King page = map + pfn1; 101204ecae4SRussell King end = map + pfn2; 1021da177e4SLinus Torvalds 1031da177e4SLinus Torvalds do { 1041da177e4SLinus Torvalds total++; 1051da177e4SLinus Torvalds if (PageReserved(page)) 1061da177e4SLinus Torvalds reserved++; 1071da177e4SLinus Torvalds else if (PageSwapCache(page)) 1081da177e4SLinus Torvalds cached++; 1091da177e4SLinus Torvalds else if (PageSlab(page)) 1101da177e4SLinus Torvalds slab++; 1111da177e4SLinus Torvalds else if (!page_count(page)) 1121da177e4SLinus Torvalds free++; 1131da177e4SLinus Torvalds else 1141da177e4SLinus Torvalds shared += page_count(page) - 1; 1151da177e4SLinus Torvalds page++; 1161da177e4SLinus Torvalds } while (page < end); 1171da177e4SLinus Torvalds } 1185e709827SRay Lehtiniemi } 1191da177e4SLinus Torvalds 1201da177e4SLinus Torvalds printk("%d pages of RAM\n", total); 1211da177e4SLinus Torvalds printk("%d free pages\n", free); 1221da177e4SLinus Torvalds printk("%d reserved pages\n", reserved); 1231da177e4SLinus Torvalds printk("%d slab pages\n", slab); 1241da177e4SLinus Torvalds printk("%d pages shared\n", shared); 1251da177e4SLinus Torvalds printk("%d pages swap cached\n", cached); 1261da177e4SLinus Torvalds } 1271da177e4SLinus Torvalds 128dde5828fSRussell King static void __init find_node_limits(int node, struct meminfo *mi, 129dde5828fSRussell King unsigned long *min, unsigned long *max_low, unsigned long *max_high) 130dde5828fSRussell King { 131dde5828fSRussell King int i; 132dde5828fSRussell King 133dde5828fSRussell King *min = -1UL; 134dde5828fSRussell King *max_low = *max_high = 0; 135dde5828fSRussell King 136dde5828fSRussell King for_each_nodebank(i, mi, node) { 137dde5828fSRussell King struct membank *bank = &mi->bank[i]; 138dde5828fSRussell King unsigned long start, end; 139dde5828fSRussell King 140dde5828fSRussell King start = bank_pfn_start(bank); 141dde5828fSRussell King end = bank_pfn_end(bank); 142dde5828fSRussell King 143dde5828fSRussell King if (*min > start) 144dde5828fSRussell King *min = start; 145dde5828fSRussell King if (*max_high < end) 146dde5828fSRussell King *max_high = end; 147dde5828fSRussell King if (bank->highmem) 148dde5828fSRussell King continue; 149dde5828fSRussell King if (*max_low < end) 150dde5828fSRussell King *max_low = end; 151dde5828fSRussell King } 152dde5828fSRussell King } 153dde5828fSRussell King 1541da177e4SLinus Torvalds /* 1551da177e4SLinus Torvalds * FIXME: We really want to avoid allocating the bootmap bitmap 1561da177e4SLinus Torvalds * over the top of the initrd. Hopefully, this is located towards 1571da177e4SLinus Torvalds * the start of a bank, so if we allocate the bootmap bitmap at 1581da177e4SLinus Torvalds * the end, we won't clash. 1591da177e4SLinus Torvalds */ 1601da177e4SLinus Torvalds static unsigned int __init 1611da177e4SLinus Torvalds find_bootmap_pfn(int node, struct meminfo *mi, unsigned int bootmap_pages) 1621da177e4SLinus Torvalds { 163d2a38ef9SRussell King unsigned int start_pfn, i, bootmap_pfn; 1641da177e4SLinus Torvalds 16537efe642SRussell King start_pfn = PAGE_ALIGN(__pa(_end)) >> PAGE_SHIFT; 1661da177e4SLinus Torvalds bootmap_pfn = 0; 1671da177e4SLinus Torvalds 168d2a38ef9SRussell King for_each_nodebank(i, mi, node) { 169d2a38ef9SRussell King struct membank *bank = &mi->bank[i]; 1701da177e4SLinus Torvalds unsigned int start, end; 1711da177e4SLinus Torvalds 172d2a38ef9SRussell King start = bank_pfn_start(bank); 173d2a38ef9SRussell King end = bank_pfn_end(bank); 1741da177e4SLinus Torvalds 1751da177e4SLinus Torvalds if (end < start_pfn) 1761da177e4SLinus Torvalds continue; 1771da177e4SLinus Torvalds 1781da177e4SLinus Torvalds if (start < start_pfn) 1791da177e4SLinus Torvalds start = start_pfn; 1801da177e4SLinus Torvalds 1811da177e4SLinus Torvalds if (end <= start) 1821da177e4SLinus Torvalds continue; 1831da177e4SLinus Torvalds 1841da177e4SLinus Torvalds if (end - start >= bootmap_pages) { 1851da177e4SLinus Torvalds bootmap_pfn = start; 1861da177e4SLinus Torvalds break; 1871da177e4SLinus Torvalds } 1881da177e4SLinus Torvalds } 1891da177e4SLinus Torvalds 1901da177e4SLinus Torvalds if (bootmap_pfn == 0) 1911da177e4SLinus Torvalds BUG(); 1921da177e4SLinus Torvalds 1931da177e4SLinus Torvalds return bootmap_pfn; 1941da177e4SLinus Torvalds } 1951da177e4SLinus Torvalds 1961da177e4SLinus Torvalds static int __init check_initrd(struct meminfo *mi) 1971da177e4SLinus Torvalds { 1981da177e4SLinus Torvalds int initrd_node = -2; 1991da177e4SLinus Torvalds #ifdef CONFIG_BLK_DEV_INITRD 2001da177e4SLinus Torvalds unsigned long end = phys_initrd_start + phys_initrd_size; 2011da177e4SLinus Torvalds 2021da177e4SLinus Torvalds /* 2031da177e4SLinus Torvalds * Make sure that the initrd is within a valid area of 2041da177e4SLinus Torvalds * memory. 2051da177e4SLinus Torvalds */ 2061da177e4SLinus Torvalds if (phys_initrd_size) { 2071da177e4SLinus Torvalds unsigned int i; 2081da177e4SLinus Torvalds 2091da177e4SLinus Torvalds initrd_node = -1; 2101da177e4SLinus Torvalds 2111da177e4SLinus Torvalds for (i = 0; i < mi->nr_banks; i++) { 212d2a38ef9SRussell King struct membank *bank = &mi->bank[i]; 213d2a38ef9SRussell King if (bank_phys_start(bank) <= phys_initrd_start && 214d2a38ef9SRussell King end <= bank_phys_end(bank)) 215d2a38ef9SRussell King initrd_node = bank->node; 2161da177e4SLinus Torvalds } 2171da177e4SLinus Torvalds } 2181da177e4SLinus Torvalds 2191da177e4SLinus Torvalds if (initrd_node == -1) { 220b962a286SRussell King printk(KERN_ERR "INITRD: 0x%08lx+0x%08lx extends beyond " 2211da177e4SLinus Torvalds "physical memory - disabling initrd\n", 222b962a286SRussell King phys_initrd_start, phys_initrd_size); 2231da177e4SLinus Torvalds phys_initrd_start = phys_initrd_size = 0; 2241da177e4SLinus Torvalds } 2251da177e4SLinus Torvalds #endif 2261da177e4SLinus Torvalds 2271da177e4SLinus Torvalds return initrd_node; 2281da177e4SLinus Torvalds } 2291da177e4SLinus Torvalds 230456335e2SRussell King static inline void map_memory_bank(struct membank *bank) 231456335e2SRussell King { 232d111e8f9SRussell King #ifdef CONFIG_MMU 233456335e2SRussell King struct map_desc map; 234456335e2SRussell King 235d2a38ef9SRussell King map.pfn = bank_pfn_start(bank); 236d2a38ef9SRussell King map.virtual = __phys_to_virt(bank_phys_start(bank)); 237d2a38ef9SRussell King map.length = bank_phys_size(bank); 238456335e2SRussell King map.type = MT_MEMORY; 239456335e2SRussell King 240456335e2SRussell King create_mapping(&map); 241d111e8f9SRussell King #endif 242456335e2SRussell King } 243456335e2SRussell King 244dde5828fSRussell King static void __init bootmem_init_node(int node, struct meminfo *mi, 245dde5828fSRussell King unsigned long start_pfn, unsigned long end_pfn) 2461da177e4SLinus Torvalds { 247dde5828fSRussell King unsigned long boot_pfn; 24890072059SRussell King unsigned int boot_pages; 24990072059SRussell King pg_data_t *pgdat; 25090072059SRussell King int i; 2511da177e4SLinus Torvalds 25290072059SRussell King /* 253dde5828fSRussell King * Map the memory banks for this node. 25490072059SRussell King */ 25590072059SRussell King for_each_nodebank(i, mi, node) { 256456335e2SRussell King struct membank *bank = &mi->bank[i]; 25790072059SRussell King 258dde5828fSRussell King if (!bank->highmem) 259456335e2SRussell King map_memory_bank(bank); 2601da177e4SLinus Torvalds } 2611da177e4SLinus Torvalds 2621da177e4SLinus Torvalds /* 26390072059SRussell King * Allocate the bootmem bitmap page. 2641da177e4SLinus Torvalds */ 26590072059SRussell King boot_pages = bootmem_bootmap_pages(end_pfn - start_pfn); 26690072059SRussell King boot_pfn = find_bootmap_pfn(node, mi, boot_pages); 2671da177e4SLinus Torvalds 2681da177e4SLinus Torvalds /* 26990072059SRussell King * Initialise the bootmem allocator for this node, handing the 27090072059SRussell King * memory banks over to bootmem. 2711da177e4SLinus Torvalds */ 27290072059SRussell King node_set_online(node); 27390072059SRussell King pgdat = NODE_DATA(node); 27490072059SRussell King init_bootmem_node(pgdat, boot_pfn, start_pfn, end_pfn); 27590072059SRussell King 276d2a38ef9SRussell King for_each_nodebank(i, mi, node) { 277d2a38ef9SRussell King struct membank *bank = &mi->bank[i]; 278dde5828fSRussell King if (!bank->highmem) 279d2a38ef9SRussell King free_bootmem_node(pgdat, bank_phys_start(bank), bank_phys_size(bank)); 280d2a38ef9SRussell King } 2811da177e4SLinus Torvalds 2821da177e4SLinus Torvalds /* 28390072059SRussell King * Reserve the bootmem bitmap for this node. 2841da177e4SLinus Torvalds */ 28590072059SRussell King reserve_bootmem_node(pgdat, boot_pfn << PAGE_SHIFT, 28672a7fe39SBernhard Walle boot_pages << PAGE_SHIFT, BOOTMEM_DEFAULT); 287b7a69ac3SRussell King } 288b962a286SRussell King 289b7a69ac3SRussell King static void __init bootmem_reserve_initrd(int node) 290b7a69ac3SRussell King { 2911da177e4SLinus Torvalds #ifdef CONFIG_BLK_DEV_INITRD 292b7a69ac3SRussell King pg_data_t *pgdat = NODE_DATA(node); 293b7a69ac3SRussell King int res; 294b7a69ac3SRussell King 295b7a69ac3SRussell King res = reserve_bootmem_node(pgdat, phys_initrd_start, 296b962a286SRussell King phys_initrd_size, BOOTMEM_EXCLUSIVE); 297b962a286SRussell King 298b962a286SRussell King if (res == 0) { 2991da177e4SLinus Torvalds initrd_start = __phys_to_virt(phys_initrd_start); 3001da177e4SLinus Torvalds initrd_end = initrd_start + phys_initrd_size; 301b962a286SRussell King } else { 302b962a286SRussell King printk(KERN_ERR 303b962a286SRussell King "INITRD: 0x%08lx+0x%08lx overlaps in-use " 304b962a286SRussell King "memory region - disabling initrd\n", 305b962a286SRussell King phys_initrd_start, phys_initrd_size); 306b962a286SRussell King } 3071da177e4SLinus Torvalds #endif 308b7a69ac3SRussell King } 309b7a69ac3SRussell King 310b7a69ac3SRussell King static void __init bootmem_free_node(int node, struct meminfo *mi) 311b7a69ac3SRussell King { 312b7a69ac3SRussell King unsigned long zone_size[MAX_NR_ZONES], zhole_size[MAX_NR_ZONES]; 313dde5828fSRussell King unsigned long min, max_low, max_high; 314b7a69ac3SRussell King int i; 315b7a69ac3SRussell King 316dde5828fSRussell King find_node_limits(node, mi, &min, &max_low, &max_high); 3171da177e4SLinus Torvalds 31890072059SRussell King /* 31990072059SRussell King * initialise the zones within this node. 32090072059SRussell King */ 32190072059SRussell King memset(zone_size, 0, sizeof(zone_size)); 32290072059SRussell King 32390072059SRussell King /* 32490072059SRussell King * The size of this node has already been determined. If we need 32590072059SRussell King * to do anything fancy with the allocation of this memory to the 32690072059SRussell King * zones, now is the time to do it. 32790072059SRussell King */ 328dde5828fSRussell King zone_size[0] = max_low - min; 329dde5828fSRussell King #ifdef CONFIG_HIGHMEM 330dde5828fSRussell King zone_size[ZONE_HIGHMEM] = max_high - max_low; 331dde5828fSRussell King #endif 33290072059SRussell King 33390072059SRussell King /* 33490072059SRussell King * For each bank in this node, calculate the size of the holes. 33590072059SRussell King * holes = node_size - sum(bank_sizes_in_node) 33690072059SRussell King */ 337dde5828fSRussell King memcpy(zhole_size, zone_size, sizeof(zhole_size)); 338dde5828fSRussell King for_each_nodebank(i, mi, node) { 339dde5828fSRussell King int idx = 0; 340dde5828fSRussell King #ifdef CONFIG_HIGHMEM 341dde5828fSRussell King if (mi->bank[i].highmem) 342dde5828fSRussell King idx = ZONE_HIGHMEM; 343dde5828fSRussell King #endif 344dde5828fSRussell King zhole_size[idx] -= bank_pfn_size(&mi->bank[i]); 345dde5828fSRussell King } 34690072059SRussell King 34790072059SRussell King /* 34890072059SRussell King * Adjust the sizes according to any special requirements for 34990072059SRussell King * this machine type. 35090072059SRussell King */ 35190072059SRussell King arch_adjust_zones(node, zone_size, zhole_size); 35290072059SRussell King 353dde5828fSRussell King free_area_init_node(node, zone_size, min, zhole_size); 35490072059SRussell King } 35590072059SRussell King 356b7cfda9fSRussell King #ifndef CONFIG_SPARSEMEM 357b7cfda9fSRussell King int pfn_valid(unsigned long pfn) 358b7cfda9fSRussell King { 359b7cfda9fSRussell King struct meminfo *mi = &meminfo; 360b7cfda9fSRussell King unsigned int left = 0, right = mi->nr_banks; 361b7cfda9fSRussell King 362b7cfda9fSRussell King do { 363b7cfda9fSRussell King unsigned int mid = (right + left) / 2; 364b7cfda9fSRussell King struct membank *bank = &mi->bank[mid]; 365b7cfda9fSRussell King 366b7cfda9fSRussell King if (pfn < bank_pfn_start(bank)) 367b7cfda9fSRussell King right = mid; 368b7cfda9fSRussell King else if (pfn >= bank_pfn_end(bank)) 369b7cfda9fSRussell King left = mid + 1; 370b7cfda9fSRussell King else 371b7cfda9fSRussell King return 1; 372b7cfda9fSRussell King } while (left < right); 373b7cfda9fSRussell King return 0; 374b7cfda9fSRussell King } 375b7cfda9fSRussell King EXPORT_SYMBOL(pfn_valid); 376657e12fdSRussell King 377657e12fdSRussell King static void arm_memory_present(struct meminfo *mi, int node) 378657e12fdSRussell King { 379657e12fdSRussell King } 380657e12fdSRussell King #else 381657e12fdSRussell King static void arm_memory_present(struct meminfo *mi, int node) 382657e12fdSRussell King { 383657e12fdSRussell King int i; 384657e12fdSRussell King for_each_nodebank(i, mi, node) { 385657e12fdSRussell King struct membank *bank = &mi->bank[i]; 386657e12fdSRussell King memory_present(node, bank_pfn_start(bank), bank_pfn_end(bank)); 387657e12fdSRussell King } 388657e12fdSRussell King } 389b7cfda9fSRussell King #endif 390b7cfda9fSRussell King 391b7cfda9fSRussell King static int __init meminfo_cmp(const void *_a, const void *_b) 392b7cfda9fSRussell King { 393b7cfda9fSRussell King const struct membank *a = _a, *b = _b; 394b7cfda9fSRussell King long cmp = bank_pfn_start(a) - bank_pfn_start(b); 395b7cfda9fSRussell King return cmp < 0 ? -1 : cmp > 0 ? 1 : 0; 396b7cfda9fSRussell King } 397b7cfda9fSRussell King 3984b5f32ceSNicolas Pitre void __init bootmem_init(void) 39990072059SRussell King { 4004b5f32ceSNicolas Pitre struct meminfo *mi = &meminfo; 401dde5828fSRussell King unsigned long min, max_low, max_high; 402eca73214SRussell King int node, initrd_node; 40390072059SRussell King 404b7cfda9fSRussell King sort(&mi->bank, mi->nr_banks, sizeof(mi->bank[0]), meminfo_cmp, NULL); 405b7cfda9fSRussell King 40690072059SRussell King /* 40790072059SRussell King * Locate which node contains the ramdisk image, if any. 40890072059SRussell King */ 40990072059SRussell King initrd_node = check_initrd(mi); 41090072059SRussell King 411dde5828fSRussell King max_low = max_high = 0; 412dde5828fSRussell King 41390072059SRussell King /* 41490072059SRussell King * Run through each node initialising the bootmem allocator. 41590072059SRussell King */ 41690072059SRussell King for_each_node(node) { 417dde5828fSRussell King unsigned long node_low, node_high; 418dde5828fSRussell King 419dde5828fSRussell King find_node_limits(node, mi, &min, &node_low, &node_high); 420dde5828fSRussell King 421dde5828fSRussell King if (node_low > max_low) 422dde5828fSRussell King max_low = node_low; 423dde5828fSRussell King if (node_high > max_high) 424dde5828fSRussell King max_high = node_high; 425dde5828fSRussell King 426dde5828fSRussell King /* 427dde5828fSRussell King * If there is no memory in this node, ignore it. 428dde5828fSRussell King * (We can't have nodes which have no lowmem) 429dde5828fSRussell King */ 430dde5828fSRussell King if (node_low == 0) 431dde5828fSRussell King continue; 432dde5828fSRussell King 433dde5828fSRussell King bootmem_init_node(node, mi, min, node_low); 43490072059SRussell King 435b7a69ac3SRussell King /* 436b7a69ac3SRussell King * Reserve any special node zero regions. 437b7a69ac3SRussell King */ 438b7a69ac3SRussell King if (node == 0) 439b7a69ac3SRussell King reserve_node_zero(NODE_DATA(node)); 440b7a69ac3SRussell King 441b7a69ac3SRussell King /* 442b7a69ac3SRussell King * If the initrd is in this node, reserve its memory. 443b7a69ac3SRussell King */ 444b7a69ac3SRussell King if (node == initrd_node) 445b7a69ac3SRussell King bootmem_reserve_initrd(node); 446657e12fdSRussell King 447657e12fdSRussell King /* 448657e12fdSRussell King * Sparsemem tries to allocate bootmem in memory_present(), 449657e12fdSRussell King * so must be done after the fixed reservations 450657e12fdSRussell King */ 451657e12fdSRussell King arm_memory_present(mi, node); 45290072059SRussell King } 45390072059SRussell King 454b7a69ac3SRussell King /* 455b7a69ac3SRussell King * sparse_init() needs the bootmem allocator up and running. 456b7a69ac3SRussell King */ 457b7a69ac3SRussell King sparse_init(); 458b7a69ac3SRussell King 459b7a69ac3SRussell King /* 460b7a69ac3SRussell King * Now free memory in each node - free_area_init_node needs 461b7a69ac3SRussell King * the sparse mem_map arrays initialized by sparse_init() 462b7a69ac3SRussell King * for memmap_init_zone(), otherwise all PFNs are invalid. 463b7a69ac3SRussell King */ 464b7a69ac3SRussell King for_each_node(node) 465b7a69ac3SRussell King bootmem_free_node(node, mi); 466b7a69ac3SRussell King 467dde5828fSRussell King high_memory = __va((max_low << PAGE_SHIFT) - 1) + 1; 46890072059SRussell King 46990072059SRussell King /* 47090072059SRussell King * This doesn't seem to be used by the Linux memory manager any 47190072059SRussell King * more, but is used by ll_rw_block. If we can get rid of it, we 47290072059SRussell King * also get rid of some of the stuff above as well. 47390072059SRussell King * 47490072059SRussell King * Note: max_low_pfn and max_pfn reflect the number of _pages_ in 47590072059SRussell King * the system, not the maximum PFN. 47690072059SRussell King */ 477dde5828fSRussell King max_low_pfn = max_low - PHYS_PFN_OFFSET; 478dde5828fSRussell King max_pfn = max_high - PHYS_PFN_OFFSET; 47990072059SRussell King } 48090072059SRussell King 4816db015e4SNicolas Pitre static inline int free_area(unsigned long pfn, unsigned long end, char *s) 4821da177e4SLinus Torvalds { 4836db015e4SNicolas Pitre unsigned int pages = 0, size = (end - pfn) << (PAGE_SHIFT - 10); 4841da177e4SLinus Torvalds 4856db015e4SNicolas Pitre for (; pfn < end; pfn++) { 4866db015e4SNicolas Pitre struct page *page = pfn_to_page(pfn); 4871da177e4SLinus Torvalds ClearPageReserved(page); 4887835e98bSNick Piggin init_page_count(page); 4896db015e4SNicolas Pitre __free_page(page); 4906db015e4SNicolas Pitre pages++; 4911da177e4SLinus Torvalds } 4921da177e4SLinus Torvalds 4931da177e4SLinus Torvalds if (size && s) 4941da177e4SLinus Torvalds printk(KERN_INFO "Freeing %s memory: %dK\n", s, size); 4956db015e4SNicolas Pitre 4966db015e4SNicolas Pitre return pages; 4971da177e4SLinus Torvalds } 4981da177e4SLinus Torvalds 499a013053dSRussell King static inline void 500a013053dSRussell King free_memmap(int node, unsigned long start_pfn, unsigned long end_pfn) 501a013053dSRussell King { 502a013053dSRussell King struct page *start_pg, *end_pg; 503a013053dSRussell King unsigned long pg, pgend; 504a013053dSRussell King 505a013053dSRussell King /* 506a013053dSRussell King * Convert start_pfn/end_pfn to a struct page pointer. 507a013053dSRussell King */ 5083257f43dSCatalin Marinas start_pg = pfn_to_page(start_pfn - 1) + 1; 509a013053dSRussell King end_pg = pfn_to_page(end_pfn); 510a013053dSRussell King 511a013053dSRussell King /* 512a013053dSRussell King * Convert to physical addresses, and 513a013053dSRussell King * round start upwards and end downwards. 514a013053dSRussell King */ 515a013053dSRussell King pg = PAGE_ALIGN(__pa(start_pg)); 516a013053dSRussell King pgend = __pa(end_pg) & PAGE_MASK; 517a013053dSRussell King 518a013053dSRussell King /* 519a013053dSRussell King * If there are free pages between these, 520a013053dSRussell King * free the section of the memmap array. 521a013053dSRussell King */ 522a013053dSRussell King if (pg < pgend) 523a013053dSRussell King free_bootmem_node(NODE_DATA(node), pg, pgend - pg); 524a013053dSRussell King } 525a013053dSRussell King 526a013053dSRussell King /* 527a013053dSRussell King * The mem_map array can get very big. Free the unused area of the memory map. 528a013053dSRussell King */ 529a013053dSRussell King static void __init free_unused_memmap_node(int node, struct meminfo *mi) 530a013053dSRussell King { 531a013053dSRussell King unsigned long bank_start, prev_bank_end = 0; 532a013053dSRussell King unsigned int i; 533a013053dSRussell King 534a013053dSRussell King /* 535a013053dSRussell King * [FIXME] This relies on each bank being in address order. This 536a013053dSRussell King * may not be the case, especially if the user has provided the 537a013053dSRussell King * information on the command line. 538a013053dSRussell King */ 53990072059SRussell King for_each_nodebank(i, mi, node) { 540d2a38ef9SRussell King struct membank *bank = &mi->bank[i]; 541d2a38ef9SRussell King 542d2a38ef9SRussell King bank_start = bank_pfn_start(bank); 543a013053dSRussell King if (bank_start < prev_bank_end) { 544a013053dSRussell King printk(KERN_ERR "MEM: unordered memory banks. " 545a013053dSRussell King "Not freeing memmap.\n"); 546a013053dSRussell King break; 547a013053dSRussell King } 548a013053dSRussell King 549a013053dSRussell King /* 550a013053dSRussell King * If we had a previous bank, and there is a space 551a013053dSRussell King * between the current bank and the previous, free it. 552a013053dSRussell King */ 553a013053dSRussell King if (prev_bank_end && prev_bank_end != bank_start) 554a013053dSRussell King free_memmap(node, prev_bank_end, bank_start); 555a013053dSRussell King 556d2a38ef9SRussell King prev_bank_end = bank_pfn_end(bank); 557a013053dSRussell King } 558a013053dSRussell King } 559a013053dSRussell King 5601da177e4SLinus Torvalds /* 5611da177e4SLinus Torvalds * mem_init() marks the free areas in the mem_map and tells us how much 5621da177e4SLinus Torvalds * memory is free. This is done after various parts of the system have 5631da177e4SLinus Torvalds * claimed their memory after the kernel image. 5641da177e4SLinus Torvalds */ 5651da177e4SLinus Torvalds void __init mem_init(void) 5661da177e4SLinus Torvalds { 567db9ef1afSFenkart/Bostandzhyan unsigned long reserved_pages, free_pages; 5681da177e4SLinus Torvalds int i, node; 5691da177e4SLinus Torvalds 5701da177e4SLinus Torvalds #ifndef CONFIG_DISCONTIGMEM 5713835f6cbSNicolas Pitre max_mapnr = pfn_to_page(max_pfn + PHYS_PFN_OFFSET) - mem_map; 5721da177e4SLinus Torvalds #endif 5731da177e4SLinus Torvalds 5741da177e4SLinus Torvalds /* this will put all unused low memory onto the freelists */ 5751da177e4SLinus Torvalds for_each_online_node(node) { 5761da177e4SLinus Torvalds pg_data_t *pgdat = NODE_DATA(node); 5771da177e4SLinus Torvalds 578a013053dSRussell King free_unused_memmap_node(node, &meminfo); 579a013053dSRussell King 5801da177e4SLinus Torvalds if (pgdat->node_spanned_pages != 0) 5811da177e4SLinus Torvalds totalram_pages += free_all_bootmem_node(pgdat); 5821da177e4SLinus Torvalds } 5831da177e4SLinus Torvalds 5841da177e4SLinus Torvalds #ifdef CONFIG_SA1111 5851da177e4SLinus Torvalds /* now that our DMA memory is actually so designated, we can free it */ 5866db015e4SNicolas Pitre totalram_pages += free_area(PHYS_PFN_OFFSET, 5876db015e4SNicolas Pitre __phys_to_pfn(__pa(swapper_pg_dir)), NULL); 5881da177e4SLinus Torvalds #endif 5891da177e4SLinus Torvalds 5903835f6cbSNicolas Pitre #ifdef CONFIG_HIGHMEM 5913835f6cbSNicolas Pitre /* set highmem page free */ 5923835f6cbSNicolas Pitre for_each_online_node(node) { 5933835f6cbSNicolas Pitre for_each_nodebank (i, &meminfo, node) { 5943835f6cbSNicolas Pitre unsigned long start = bank_pfn_start(&meminfo.bank[i]); 5953835f6cbSNicolas Pitre unsigned long end = bank_pfn_end(&meminfo.bank[i]); 5963835f6cbSNicolas Pitre if (start >= max_low_pfn + PHYS_PFN_OFFSET) 5973835f6cbSNicolas Pitre totalhigh_pages += free_area(start, end, NULL); 5983835f6cbSNicolas Pitre } 5993835f6cbSNicolas Pitre } 6003835f6cbSNicolas Pitre totalram_pages += totalhigh_pages; 6013835f6cbSNicolas Pitre #endif 6023835f6cbSNicolas Pitre 603db9ef1afSFenkart/Bostandzhyan reserved_pages = free_pages = 0; 604db9ef1afSFenkart/Bostandzhyan 605db9ef1afSFenkart/Bostandzhyan for_each_online_node(node) { 606db9ef1afSFenkart/Bostandzhyan pg_data_t *n = NODE_DATA(node); 607db9ef1afSFenkart/Bostandzhyan struct page *map = pgdat_page_nr(n, 0) - n->node_start_pfn; 608db9ef1afSFenkart/Bostandzhyan 609db9ef1afSFenkart/Bostandzhyan for_each_nodebank(i, &meminfo, node) { 610db9ef1afSFenkart/Bostandzhyan struct membank *bank = &meminfo.bank[i]; 611db9ef1afSFenkart/Bostandzhyan unsigned int pfn1, pfn2; 612db9ef1afSFenkart/Bostandzhyan struct page *page, *end; 613db9ef1afSFenkart/Bostandzhyan 614db9ef1afSFenkart/Bostandzhyan pfn1 = bank_pfn_start(bank); 615db9ef1afSFenkart/Bostandzhyan pfn2 = bank_pfn_end(bank); 616db9ef1afSFenkart/Bostandzhyan 617db9ef1afSFenkart/Bostandzhyan page = map + pfn1; 618db9ef1afSFenkart/Bostandzhyan end = map + pfn2; 619db9ef1afSFenkart/Bostandzhyan 620db9ef1afSFenkart/Bostandzhyan do { 621db9ef1afSFenkart/Bostandzhyan if (PageReserved(page)) 622db9ef1afSFenkart/Bostandzhyan reserved_pages++; 623db9ef1afSFenkart/Bostandzhyan else if (!page_count(page)) 624db9ef1afSFenkart/Bostandzhyan free_pages++; 625db9ef1afSFenkart/Bostandzhyan page++; 626db9ef1afSFenkart/Bostandzhyan } while (page < end); 627db9ef1afSFenkart/Bostandzhyan } 628db9ef1afSFenkart/Bostandzhyan } 629db9ef1afSFenkart/Bostandzhyan 6301da177e4SLinus Torvalds /* 6311da177e4SLinus Torvalds * Since our memory may not be contiguous, calculate the 6321da177e4SLinus Torvalds * real number of pages we have in this system 6331da177e4SLinus Torvalds */ 6341da177e4SLinus Torvalds printk(KERN_INFO "Memory:"); 6351da177e4SLinus Torvalds num_physpages = 0; 6361da177e4SLinus Torvalds for (i = 0; i < meminfo.nr_banks; i++) { 637d2a38ef9SRussell King num_physpages += bank_pfn_size(&meminfo.bank[i]); 638d2a38ef9SRussell King printk(" %ldMB", bank_phys_size(&meminfo.bank[i]) >> 20); 6391da177e4SLinus Torvalds } 6401da177e4SLinus Torvalds printk(" = %luMB total\n", num_physpages >> (20 - PAGE_SHIFT)); 6416db015e4SNicolas Pitre 642db9ef1afSFenkart/Bostandzhyan printk(KERN_NOTICE "Memory: %luk/%luk available, %luk reserved, %luK highmem\n", 643db9ef1afSFenkart/Bostandzhyan nr_free_pages() << (PAGE_SHIFT-10), 644db9ef1afSFenkart/Bostandzhyan free_pages << (PAGE_SHIFT-10), 645db9ef1afSFenkart/Bostandzhyan reserved_pages << (PAGE_SHIFT-10), 6464b529401SAndreas Fenkart totalhigh_pages << (PAGE_SHIFT-10)); 6471da177e4SLinus Torvalds 648db9ef1afSFenkart/Bostandzhyan #define MLK(b, t) b, t, ((t) - (b)) >> 10 649db9ef1afSFenkart/Bostandzhyan #define MLM(b, t) b, t, ((t) - (b)) >> 20 650db9ef1afSFenkart/Bostandzhyan #define MLK_ROUNDUP(b, t) b, t, DIV_ROUND_UP(((t) - (b)), SZ_1K) 651db9ef1afSFenkart/Bostandzhyan 652db9ef1afSFenkart/Bostandzhyan printk(KERN_NOTICE "Virtual kernel memory layout:\n" 653db9ef1afSFenkart/Bostandzhyan " vector : 0x%08lx - 0x%08lx (%4ld kB)\n" 654db9ef1afSFenkart/Bostandzhyan " fixmap : 0x%08lx - 0x%08lx (%4ld kB)\n" 655a7bd08c8SFenkart/Bostandzhyan #ifdef CONFIG_MMU 656a7bd08c8SFenkart/Bostandzhyan " DMA : 0x%08lx - 0x%08lx (%4ld MB)\n" 657a7bd08c8SFenkart/Bostandzhyan #endif 658db9ef1afSFenkart/Bostandzhyan " vmalloc : 0x%08lx - 0x%08lx (%4ld MB)\n" 659db9ef1afSFenkart/Bostandzhyan " lowmem : 0x%08lx - 0x%08lx (%4ld MB)\n" 660db9ef1afSFenkart/Bostandzhyan #ifdef CONFIG_HIGHMEM 661db9ef1afSFenkart/Bostandzhyan " pkmap : 0x%08lx - 0x%08lx (%4ld MB)\n" 662db9ef1afSFenkart/Bostandzhyan #endif 663db9ef1afSFenkart/Bostandzhyan " modules : 0x%08lx - 0x%08lx (%4ld MB)\n" 664db9ef1afSFenkart/Bostandzhyan " .init : 0x%p" " - 0x%p" " (%4d kB)\n" 665db9ef1afSFenkart/Bostandzhyan " .text : 0x%p" " - 0x%p" " (%4d kB)\n" 666db9ef1afSFenkart/Bostandzhyan " .data : 0x%p" " - 0x%p" " (%4d kB)\n", 667db9ef1afSFenkart/Bostandzhyan 668db9ef1afSFenkart/Bostandzhyan MLK(UL(CONFIG_VECTORS_BASE), UL(CONFIG_VECTORS_BASE) + 669db9ef1afSFenkart/Bostandzhyan (PAGE_SIZE)), 670db9ef1afSFenkart/Bostandzhyan MLK(FIXADDR_START, FIXADDR_TOP), 671a7bd08c8SFenkart/Bostandzhyan #ifdef CONFIG_MMU 672a7bd08c8SFenkart/Bostandzhyan MLM(CONSISTENT_BASE, CONSISTENT_END), 673a7bd08c8SFenkart/Bostandzhyan #endif 674c931b4f6SFenkart/Bostandzhyan MLM(VMALLOC_START, VMALLOC_END), 675db9ef1afSFenkart/Bostandzhyan MLM(PAGE_OFFSET, (unsigned long)high_memory), 676db9ef1afSFenkart/Bostandzhyan #ifdef CONFIG_HIGHMEM 677db9ef1afSFenkart/Bostandzhyan MLM(PKMAP_BASE, (PKMAP_BASE) + (LAST_PKMAP) * 678db9ef1afSFenkart/Bostandzhyan (PAGE_SIZE)), 679db9ef1afSFenkart/Bostandzhyan #endif 680db9ef1afSFenkart/Bostandzhyan MLM(MODULES_VADDR, MODULES_END), 681db9ef1afSFenkart/Bostandzhyan 682db9ef1afSFenkart/Bostandzhyan MLK_ROUNDUP(__init_begin, __init_end), 683db9ef1afSFenkart/Bostandzhyan MLK_ROUNDUP(_text, _etext), 684db9ef1afSFenkart/Bostandzhyan MLK_ROUNDUP(_data, _edata)); 685db9ef1afSFenkart/Bostandzhyan 686db9ef1afSFenkart/Bostandzhyan #undef MLK 687db9ef1afSFenkart/Bostandzhyan #undef MLM 688db9ef1afSFenkart/Bostandzhyan #undef MLK_ROUNDUP 689db9ef1afSFenkart/Bostandzhyan 690a1839272SFenkart/Bostandzhyan /* 691a1839272SFenkart/Bostandzhyan * Check boundaries twice: Some fundamental inconsistencies can 692a1839272SFenkart/Bostandzhyan * be detected at build time already. 693a1839272SFenkart/Bostandzhyan */ 694a1839272SFenkart/Bostandzhyan #ifdef CONFIG_MMU 695a1839272SFenkart/Bostandzhyan BUILD_BUG_ON(VMALLOC_END > CONSISTENT_BASE); 696a1839272SFenkart/Bostandzhyan BUG_ON(VMALLOC_END > CONSISTENT_BASE); 697a1839272SFenkart/Bostandzhyan 698a1839272SFenkart/Bostandzhyan BUILD_BUG_ON(TASK_SIZE > MODULES_VADDR); 699a1839272SFenkart/Bostandzhyan BUG_ON(TASK_SIZE > MODULES_VADDR); 700a1839272SFenkart/Bostandzhyan #endif 701a1839272SFenkart/Bostandzhyan 702a1839272SFenkart/Bostandzhyan #ifdef CONFIG_HIGHMEM 703a1839272SFenkart/Bostandzhyan BUILD_BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE > PAGE_OFFSET); 704a1839272SFenkart/Bostandzhyan BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE > PAGE_OFFSET); 705a1839272SFenkart/Bostandzhyan #endif 706a1839272SFenkart/Bostandzhyan 7071da177e4SLinus Torvalds if (PAGE_SIZE >= 16384 && num_physpages <= 128) { 7081da177e4SLinus Torvalds extern int sysctl_overcommit_memory; 7091da177e4SLinus Torvalds /* 7101da177e4SLinus Torvalds * On a machine this small we won't get 7111da177e4SLinus Torvalds * anywhere without overcommit, so turn 7121da177e4SLinus Torvalds * it on by default. 7131da177e4SLinus Torvalds */ 7141da177e4SLinus Torvalds sysctl_overcommit_memory = OVERCOMMIT_ALWAYS; 7151da177e4SLinus Torvalds } 7161da177e4SLinus Torvalds } 7171da177e4SLinus Torvalds 7181da177e4SLinus Torvalds void free_initmem(void) 7191da177e4SLinus Torvalds { 720bc581770SLinus Walleij #ifdef CONFIG_HAVE_TCM 721bc581770SLinus Walleij extern char *__tcm_start, *__tcm_end; 722bc581770SLinus Walleij 723bc581770SLinus Walleij totalram_pages += free_area(__phys_to_pfn(__pa(__tcm_start)), 724bc581770SLinus Walleij __phys_to_pfn(__pa(__tcm_end)), 725bc581770SLinus Walleij "TCM link"); 726bc581770SLinus Walleij #endif 727bc581770SLinus Walleij 7286db015e4SNicolas Pitre if (!machine_is_integrator() && !machine_is_cintegrator()) 72937efe642SRussell King totalram_pages += free_area(__phys_to_pfn(__pa(__init_begin)), 73037efe642SRussell King __phys_to_pfn(__pa(__init_end)), 7311da177e4SLinus Torvalds "init"); 7321da177e4SLinus Torvalds } 7331da177e4SLinus Torvalds 7341da177e4SLinus Torvalds #ifdef CONFIG_BLK_DEV_INITRD 7351da177e4SLinus Torvalds 7361da177e4SLinus Torvalds static int keep_initrd; 7371da177e4SLinus Torvalds 7381da177e4SLinus Torvalds void free_initrd_mem(unsigned long start, unsigned long end) 7391da177e4SLinus Torvalds { 7401da177e4SLinus Torvalds if (!keep_initrd) 7416db015e4SNicolas Pitre totalram_pages += free_area(__phys_to_pfn(__pa(start)), 7426db015e4SNicolas Pitre __phys_to_pfn(__pa(end)), 7436db015e4SNicolas Pitre "initrd"); 7441da177e4SLinus Torvalds } 7451da177e4SLinus Torvalds 7461da177e4SLinus Torvalds static int __init keepinitrd_setup(char *__unused) 7471da177e4SLinus Torvalds { 7481da177e4SLinus Torvalds keep_initrd = 1; 7491da177e4SLinus Torvalds return 1; 7501da177e4SLinus Torvalds } 7511da177e4SLinus Torvalds 7521da177e4SLinus Torvalds __setup("keepinitrd", keepinitrd_setup); 7531da177e4SLinus Torvalds #endif 754