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> 181da177e4SLinus Torvalds 191da177e4SLinus Torvalds #include <asm/mach-types.h> 2037efe642SRussell King #include <asm/sections.h> 211da177e4SLinus Torvalds #include <asm/setup.h> 2274d02fb9SRussell King #include <asm/sizes.h> 231da177e4SLinus Torvalds #include <asm/tlb.h> 241da177e4SLinus Torvalds 251da177e4SLinus Torvalds #include <asm/mach/arch.h> 261da177e4SLinus Torvalds #include <asm/mach/map.h> 271da177e4SLinus Torvalds 281b2e2b73SRussell King #include "mm.h" 291b2e2b73SRussell King 30012d1f4aSRussell King static unsigned long phys_initrd_start __initdata = 0; 31012d1f4aSRussell King static unsigned long phys_initrd_size __initdata = 0; 32012d1f4aSRussell King 33012d1f4aSRussell King static void __init early_initrd(char **p) 34012d1f4aSRussell King { 35012d1f4aSRussell King unsigned long start, size; 36012d1f4aSRussell King 37012d1f4aSRussell King start = memparse(*p, p); 38012d1f4aSRussell King if (**p == ',') { 39012d1f4aSRussell King size = memparse((*p) + 1, p); 40012d1f4aSRussell King 41012d1f4aSRussell King phys_initrd_start = start; 42012d1f4aSRussell King phys_initrd_size = size; 43012d1f4aSRussell King } 44012d1f4aSRussell King } 45012d1f4aSRussell King __early_param("initrd=", early_initrd); 46012d1f4aSRussell King 47012d1f4aSRussell King static int __init parse_tag_initrd(const struct tag *tag) 48012d1f4aSRussell King { 49012d1f4aSRussell King printk(KERN_WARNING "ATAG_INITRD is deprecated; " 50012d1f4aSRussell King "please update your bootloader.\n"); 51012d1f4aSRussell King phys_initrd_start = __virt_to_phys(tag->u.initrd.start); 52012d1f4aSRussell King phys_initrd_size = tag->u.initrd.size; 53012d1f4aSRussell King return 0; 54012d1f4aSRussell King } 55012d1f4aSRussell King 56012d1f4aSRussell King __tagtable(ATAG_INITRD, parse_tag_initrd); 57012d1f4aSRussell King 58012d1f4aSRussell King static int __init parse_tag_initrd2(const struct tag *tag) 59012d1f4aSRussell King { 60012d1f4aSRussell King phys_initrd_start = tag->u.initrd.start; 61012d1f4aSRussell King phys_initrd_size = tag->u.initrd.size; 62012d1f4aSRussell King return 0; 63012d1f4aSRussell King } 64012d1f4aSRussell King 65012d1f4aSRussell King __tagtable(ATAG_INITRD2, parse_tag_initrd2); 661da177e4SLinus Torvalds 671da177e4SLinus Torvalds /* 684b5f32ceSNicolas Pitre * This keeps memory configuration data used by a couple memory 694b5f32ceSNicolas Pitre * initialization functions, as well as show_mem() for the skipping 704b5f32ceSNicolas Pitre * of holes in the memory map. It is populated by arm_add_memory(). 711da177e4SLinus Torvalds */ 724b5f32ceSNicolas Pitre struct meminfo meminfo; 735e709827SRay Lehtiniemi 741da177e4SLinus Torvalds void show_mem(void) 751da177e4SLinus Torvalds { 761da177e4SLinus Torvalds int free = 0, total = 0, reserved = 0; 775e709827SRay Lehtiniemi int shared = 0, cached = 0, slab = 0, node, i; 785e709827SRay Lehtiniemi struct meminfo * mi = &meminfo; 791da177e4SLinus Torvalds 801da177e4SLinus Torvalds printk("Mem-info:\n"); 811da177e4SLinus Torvalds show_free_areas(); 821da177e4SLinus Torvalds for_each_online_node(node) { 83204ecae4SRussell King pg_data_t *n = NODE_DATA(node); 84b7a69ac3SRussell King struct page *map = pgdat_page_nr(n, 0) - n->node_start_pfn; 85204ecae4SRussell King 865e709827SRay Lehtiniemi for_each_nodebank (i,mi,node) { 87d2a38ef9SRussell King struct membank *bank = &mi->bank[i]; 885e709827SRay Lehtiniemi unsigned int pfn1, pfn2; 891da177e4SLinus Torvalds struct page *page, *end; 901da177e4SLinus Torvalds 91d2a38ef9SRussell King pfn1 = bank_pfn_start(bank); 92d2a38ef9SRussell King pfn2 = bank_pfn_end(bank); 935e709827SRay Lehtiniemi 94204ecae4SRussell King page = map + pfn1; 95204ecae4SRussell King end = map + pfn2; 961da177e4SLinus Torvalds 971da177e4SLinus Torvalds do { 981da177e4SLinus Torvalds total++; 991da177e4SLinus Torvalds if (PageReserved(page)) 1001da177e4SLinus Torvalds reserved++; 1011da177e4SLinus Torvalds else if (PageSwapCache(page)) 1021da177e4SLinus Torvalds cached++; 1031da177e4SLinus Torvalds else if (PageSlab(page)) 1041da177e4SLinus Torvalds slab++; 1051da177e4SLinus Torvalds else if (!page_count(page)) 1061da177e4SLinus Torvalds free++; 1071da177e4SLinus Torvalds else 1081da177e4SLinus Torvalds shared += page_count(page) - 1; 1091da177e4SLinus Torvalds page++; 1101da177e4SLinus Torvalds } while (page < end); 1111da177e4SLinus Torvalds } 1125e709827SRay Lehtiniemi } 1131da177e4SLinus Torvalds 1141da177e4SLinus Torvalds printk("%d pages of RAM\n", total); 1151da177e4SLinus Torvalds printk("%d free pages\n", free); 1161da177e4SLinus Torvalds printk("%d reserved pages\n", reserved); 1171da177e4SLinus Torvalds printk("%d slab pages\n", slab); 1181da177e4SLinus Torvalds printk("%d pages shared\n", shared); 1191da177e4SLinus Torvalds printk("%d pages swap cached\n", cached); 1201da177e4SLinus Torvalds } 1211da177e4SLinus Torvalds 1221da177e4SLinus Torvalds /* 1231da177e4SLinus Torvalds * FIXME: We really want to avoid allocating the bootmap bitmap 1241da177e4SLinus Torvalds * over the top of the initrd. Hopefully, this is located towards 1251da177e4SLinus Torvalds * the start of a bank, so if we allocate the bootmap bitmap at 1261da177e4SLinus Torvalds * the end, we won't clash. 1271da177e4SLinus Torvalds */ 1281da177e4SLinus Torvalds static unsigned int __init 1291da177e4SLinus Torvalds find_bootmap_pfn(int node, struct meminfo *mi, unsigned int bootmap_pages) 1301da177e4SLinus Torvalds { 131d2a38ef9SRussell King unsigned int start_pfn, i, bootmap_pfn; 1321da177e4SLinus Torvalds 13337efe642SRussell King start_pfn = PAGE_ALIGN(__pa(_end)) >> PAGE_SHIFT; 1341da177e4SLinus Torvalds bootmap_pfn = 0; 1351da177e4SLinus Torvalds 136d2a38ef9SRussell King for_each_nodebank(i, mi, node) { 137d2a38ef9SRussell King struct membank *bank = &mi->bank[i]; 1381da177e4SLinus Torvalds unsigned int start, end; 1391da177e4SLinus Torvalds 140d2a38ef9SRussell King start = bank_pfn_start(bank); 141d2a38ef9SRussell King end = bank_pfn_end(bank); 1421da177e4SLinus Torvalds 1431da177e4SLinus Torvalds if (end < start_pfn) 1441da177e4SLinus Torvalds continue; 1451da177e4SLinus Torvalds 1461da177e4SLinus Torvalds if (start < start_pfn) 1471da177e4SLinus Torvalds start = start_pfn; 1481da177e4SLinus Torvalds 1491da177e4SLinus Torvalds if (end <= start) 1501da177e4SLinus Torvalds continue; 1511da177e4SLinus Torvalds 1521da177e4SLinus Torvalds if (end - start >= bootmap_pages) { 1531da177e4SLinus Torvalds bootmap_pfn = start; 1541da177e4SLinus Torvalds break; 1551da177e4SLinus Torvalds } 1561da177e4SLinus Torvalds } 1571da177e4SLinus Torvalds 1581da177e4SLinus Torvalds if (bootmap_pfn == 0) 1591da177e4SLinus Torvalds BUG(); 1601da177e4SLinus Torvalds 1611da177e4SLinus Torvalds return bootmap_pfn; 1621da177e4SLinus Torvalds } 1631da177e4SLinus Torvalds 1641da177e4SLinus Torvalds static int __init check_initrd(struct meminfo *mi) 1651da177e4SLinus Torvalds { 1661da177e4SLinus Torvalds int initrd_node = -2; 1671da177e4SLinus Torvalds #ifdef CONFIG_BLK_DEV_INITRD 1681da177e4SLinus Torvalds unsigned long end = phys_initrd_start + phys_initrd_size; 1691da177e4SLinus Torvalds 1701da177e4SLinus Torvalds /* 1711da177e4SLinus Torvalds * Make sure that the initrd is within a valid area of 1721da177e4SLinus Torvalds * memory. 1731da177e4SLinus Torvalds */ 1741da177e4SLinus Torvalds if (phys_initrd_size) { 1751da177e4SLinus Torvalds unsigned int i; 1761da177e4SLinus Torvalds 1771da177e4SLinus Torvalds initrd_node = -1; 1781da177e4SLinus Torvalds 1791da177e4SLinus Torvalds for (i = 0; i < mi->nr_banks; i++) { 180d2a38ef9SRussell King struct membank *bank = &mi->bank[i]; 181d2a38ef9SRussell King if (bank_phys_start(bank) <= phys_initrd_start && 182d2a38ef9SRussell King end <= bank_phys_end(bank)) 183d2a38ef9SRussell King initrd_node = bank->node; 1841da177e4SLinus Torvalds } 1851da177e4SLinus Torvalds } 1861da177e4SLinus Torvalds 1871da177e4SLinus Torvalds if (initrd_node == -1) { 188b962a286SRussell King printk(KERN_ERR "INITRD: 0x%08lx+0x%08lx extends beyond " 1891da177e4SLinus Torvalds "physical memory - disabling initrd\n", 190b962a286SRussell King phys_initrd_start, phys_initrd_size); 1911da177e4SLinus Torvalds phys_initrd_start = phys_initrd_size = 0; 1921da177e4SLinus Torvalds } 1931da177e4SLinus Torvalds #endif 1941da177e4SLinus Torvalds 1951da177e4SLinus Torvalds return initrd_node; 1961da177e4SLinus Torvalds } 1971da177e4SLinus Torvalds 198456335e2SRussell King static inline void map_memory_bank(struct membank *bank) 199456335e2SRussell King { 200d111e8f9SRussell King #ifdef CONFIG_MMU 201456335e2SRussell King struct map_desc map; 202456335e2SRussell King 203d2a38ef9SRussell King map.pfn = bank_pfn_start(bank); 204d2a38ef9SRussell King map.virtual = __phys_to_virt(bank_phys_start(bank)); 205d2a38ef9SRussell King map.length = bank_phys_size(bank); 206456335e2SRussell King map.type = MT_MEMORY; 207456335e2SRussell King 208456335e2SRussell King create_mapping(&map); 209d111e8f9SRussell King #endif 210456335e2SRussell King } 211456335e2SRussell King 212b7a69ac3SRussell King static unsigned long __init bootmem_init_node(int node, struct meminfo *mi) 2131da177e4SLinus Torvalds { 21490072059SRussell King unsigned long start_pfn, end_pfn, boot_pfn; 21590072059SRussell King unsigned int boot_pages; 21690072059SRussell King pg_data_t *pgdat; 21790072059SRussell King int i; 2181da177e4SLinus Torvalds 21990072059SRussell King start_pfn = -1UL; 22090072059SRussell King end_pfn = 0; 22190072059SRussell King 22290072059SRussell King /* 22390072059SRussell King * Calculate the pfn range, and map the memory banks for this node. 22490072059SRussell King */ 22590072059SRussell King for_each_nodebank(i, mi, node) { 226456335e2SRussell King struct membank *bank = &mi->bank[i]; 22790072059SRussell King unsigned long start, end; 22890072059SRussell King 229d2a38ef9SRussell King start = bank_pfn_start(bank); 230d2a38ef9SRussell King end = bank_pfn_end(bank); 23190072059SRussell King 23290072059SRussell King if (start_pfn > start) 23390072059SRussell King start_pfn = start; 23490072059SRussell King if (end_pfn < end) 23590072059SRussell King end_pfn = end; 23690072059SRussell King 237456335e2SRussell King map_memory_bank(bank); 2381da177e4SLinus Torvalds } 2391da177e4SLinus Torvalds 2401da177e4SLinus Torvalds /* 24190072059SRussell King * If there is no memory in this node, ignore it. 2421da177e4SLinus Torvalds */ 24390072059SRussell King if (end_pfn == 0) 24490072059SRussell King return end_pfn; 2451da177e4SLinus Torvalds 2461da177e4SLinus Torvalds /* 24790072059SRussell King * Allocate the bootmem bitmap page. 2481da177e4SLinus Torvalds */ 24990072059SRussell King boot_pages = bootmem_bootmap_pages(end_pfn - start_pfn); 25090072059SRussell King boot_pfn = find_bootmap_pfn(node, mi, boot_pages); 2511da177e4SLinus Torvalds 2521da177e4SLinus Torvalds /* 25390072059SRussell King * Initialise the bootmem allocator for this node, handing the 25490072059SRussell King * memory banks over to bootmem. 2551da177e4SLinus Torvalds */ 25690072059SRussell King node_set_online(node); 25790072059SRussell King pgdat = NODE_DATA(node); 25890072059SRussell King init_bootmem_node(pgdat, boot_pfn, start_pfn, end_pfn); 25990072059SRussell King 260d2a38ef9SRussell King for_each_nodebank(i, mi, node) { 261d2a38ef9SRussell King struct membank *bank = &mi->bank[i]; 262d2a38ef9SRussell King free_bootmem_node(pgdat, bank_phys_start(bank), bank_phys_size(bank)); 263b7a69ac3SRussell King memory_present(node, bank_pfn_start(bank), bank_pfn_end(bank)); 264d2a38ef9SRussell King } 2651da177e4SLinus Torvalds 2661da177e4SLinus Torvalds /* 26790072059SRussell King * Reserve the bootmem bitmap for this node. 2681da177e4SLinus Torvalds */ 26990072059SRussell King reserve_bootmem_node(pgdat, boot_pfn << PAGE_SHIFT, 27072a7fe39SBernhard Walle boot_pages << PAGE_SHIFT, BOOTMEM_DEFAULT); 2711da177e4SLinus Torvalds 272b7a69ac3SRussell King return end_pfn; 273b7a69ac3SRussell King } 274b962a286SRussell King 275b7a69ac3SRussell King static void __init bootmem_reserve_initrd(int node) 276b7a69ac3SRussell King { 2771da177e4SLinus Torvalds #ifdef CONFIG_BLK_DEV_INITRD 278b7a69ac3SRussell King pg_data_t *pgdat = NODE_DATA(node); 279b7a69ac3SRussell King int res; 280b7a69ac3SRussell King 281b7a69ac3SRussell King res = reserve_bootmem_node(pgdat, phys_initrd_start, 282b962a286SRussell King phys_initrd_size, BOOTMEM_EXCLUSIVE); 283b962a286SRussell King 284b962a286SRussell King if (res == 0) { 2851da177e4SLinus Torvalds initrd_start = __phys_to_virt(phys_initrd_start); 2861da177e4SLinus Torvalds initrd_end = initrd_start + phys_initrd_size; 287b962a286SRussell King } else { 288b962a286SRussell King printk(KERN_ERR 289b962a286SRussell King "INITRD: 0x%08lx+0x%08lx overlaps in-use " 290b962a286SRussell King "memory region - disabling initrd\n", 291b962a286SRussell King phys_initrd_start, phys_initrd_size); 292b962a286SRussell King } 2931da177e4SLinus Torvalds #endif 294b7a69ac3SRussell King } 295b7a69ac3SRussell King 296b7a69ac3SRussell King static void __init bootmem_free_node(int node, struct meminfo *mi) 297b7a69ac3SRussell King { 298b7a69ac3SRussell King unsigned long zone_size[MAX_NR_ZONES], zhole_size[MAX_NR_ZONES]; 299b7a69ac3SRussell King unsigned long start_pfn, end_pfn; 300b7a69ac3SRussell King pg_data_t *pgdat = NODE_DATA(node); 301b7a69ac3SRussell King int i; 302b7a69ac3SRussell King 303b7a69ac3SRussell King start_pfn = pgdat->bdata->node_min_pfn; 304b7a69ac3SRussell King end_pfn = pgdat->bdata->node_low_pfn; 3051da177e4SLinus Torvalds 30690072059SRussell King /* 30790072059SRussell King * initialise the zones within this node. 30890072059SRussell King */ 30990072059SRussell King memset(zone_size, 0, sizeof(zone_size)); 31090072059SRussell King memset(zhole_size, 0, sizeof(zhole_size)); 31190072059SRussell King 31290072059SRussell King /* 31390072059SRussell King * The size of this node has already been determined. If we need 31490072059SRussell King * to do anything fancy with the allocation of this memory to the 31590072059SRussell King * zones, now is the time to do it. 31690072059SRussell King */ 31790072059SRussell King zone_size[0] = end_pfn - start_pfn; 31890072059SRussell King 31990072059SRussell King /* 32090072059SRussell King * For each bank in this node, calculate the size of the holes. 32190072059SRussell King * holes = node_size - sum(bank_sizes_in_node) 32290072059SRussell King */ 32390072059SRussell King zhole_size[0] = zone_size[0]; 32490072059SRussell King for_each_nodebank(i, mi, node) 325d2a38ef9SRussell King zhole_size[0] -= bank_pfn_size(&mi->bank[i]); 32690072059SRussell King 32790072059SRussell King /* 32890072059SRussell King * Adjust the sizes according to any special requirements for 32990072059SRussell King * this machine type. 33090072059SRussell King */ 33190072059SRussell King arch_adjust_zones(node, zone_size, zhole_size); 33290072059SRussell King 3339109fb7bSJohannes Weiner free_area_init_node(node, zone_size, start_pfn, zhole_size); 33490072059SRussell King } 33590072059SRussell King 3364b5f32ceSNicolas Pitre void __init bootmem_init(void) 33790072059SRussell King { 3384b5f32ceSNicolas Pitre struct meminfo *mi = &meminfo; 339456335e2SRussell King unsigned long memend_pfn = 0; 340eca73214SRussell King int node, initrd_node; 34190072059SRussell King 34290072059SRussell King /* 34390072059SRussell King * Locate which node contains the ramdisk image, if any. 34490072059SRussell King */ 34590072059SRussell King initrd_node = check_initrd(mi); 34690072059SRussell King 34790072059SRussell King /* 34890072059SRussell King * Run through each node initialising the bootmem allocator. 34990072059SRussell King */ 35090072059SRussell King for_each_node(node) { 351b7a69ac3SRussell King unsigned long end_pfn = bootmem_init_node(node, mi); 35290072059SRussell King 353b7a69ac3SRussell King /* 354b7a69ac3SRussell King * Reserve any special node zero regions. 355b7a69ac3SRussell King */ 356b7a69ac3SRussell King if (node == 0) 357b7a69ac3SRussell King reserve_node_zero(NODE_DATA(node)); 358b7a69ac3SRussell King 359b7a69ac3SRussell King /* 360b7a69ac3SRussell King * If the initrd is in this node, reserve its memory. 361b7a69ac3SRussell King */ 362b7a69ac3SRussell King if (node == initrd_node) 363b7a69ac3SRussell King bootmem_reserve_initrd(node); 36490072059SRussell King 36590072059SRussell King /* 36690072059SRussell King * Remember the highest memory PFN. 36790072059SRussell King */ 36890072059SRussell King if (end_pfn > memend_pfn) 36990072059SRussell King memend_pfn = end_pfn; 37090072059SRussell King } 37190072059SRussell King 372b7a69ac3SRussell King /* 373b7a69ac3SRussell King * sparse_init() needs the bootmem allocator up and running. 374b7a69ac3SRussell King */ 375b7a69ac3SRussell King sparse_init(); 376b7a69ac3SRussell King 377b7a69ac3SRussell King /* 378b7a69ac3SRussell King * Now free memory in each node - free_area_init_node needs 379b7a69ac3SRussell King * the sparse mem_map arrays initialized by sparse_init() 380b7a69ac3SRussell King * for memmap_init_zone(), otherwise all PFNs are invalid. 381b7a69ac3SRussell King */ 382b7a69ac3SRussell King for_each_node(node) 383b7a69ac3SRussell King bootmem_free_node(node, mi); 384b7a69ac3SRussell King 3851522ac3eSRussell King high_memory = __va((memend_pfn << PAGE_SHIFT) - 1) + 1; 38690072059SRussell King 38790072059SRussell King /* 38890072059SRussell King * This doesn't seem to be used by the Linux memory manager any 38990072059SRussell King * more, but is used by ll_rw_block. If we can get rid of it, we 39090072059SRussell King * also get rid of some of the stuff above as well. 39190072059SRussell King * 39290072059SRussell King * Note: max_low_pfn and max_pfn reflect the number of _pages_ in 39390072059SRussell King * the system, not the maximum PFN. 39490072059SRussell King */ 39590072059SRussell King max_pfn = max_low_pfn = memend_pfn - PHYS_PFN_OFFSET; 39690072059SRussell King } 39790072059SRussell King 3986db015e4SNicolas Pitre static inline int free_area(unsigned long pfn, unsigned long end, char *s) 3991da177e4SLinus Torvalds { 4006db015e4SNicolas Pitre unsigned int pages = 0, size = (end - pfn) << (PAGE_SHIFT - 10); 4011da177e4SLinus Torvalds 4026db015e4SNicolas Pitre for (; pfn < end; pfn++) { 4036db015e4SNicolas Pitre struct page *page = pfn_to_page(pfn); 4041da177e4SLinus Torvalds ClearPageReserved(page); 4057835e98bSNick Piggin init_page_count(page); 4066db015e4SNicolas Pitre __free_page(page); 4076db015e4SNicolas Pitre pages++; 4081da177e4SLinus Torvalds } 4091da177e4SLinus Torvalds 4101da177e4SLinus Torvalds if (size && s) 4111da177e4SLinus Torvalds printk(KERN_INFO "Freeing %s memory: %dK\n", s, size); 4126db015e4SNicolas Pitre 4136db015e4SNicolas Pitre return pages; 4141da177e4SLinus Torvalds } 4151da177e4SLinus Torvalds 416a013053dSRussell King static inline void 417a013053dSRussell King free_memmap(int node, unsigned long start_pfn, unsigned long end_pfn) 418a013053dSRussell King { 419a013053dSRussell King struct page *start_pg, *end_pg; 420a013053dSRussell King unsigned long pg, pgend; 421a013053dSRussell King 422a013053dSRussell King /* 423a013053dSRussell King * Convert start_pfn/end_pfn to a struct page pointer. 424a013053dSRussell King */ 425a013053dSRussell King start_pg = pfn_to_page(start_pfn); 426a013053dSRussell King end_pg = pfn_to_page(end_pfn); 427a013053dSRussell King 428a013053dSRussell King /* 429a013053dSRussell King * Convert to physical addresses, and 430a013053dSRussell King * round start upwards and end downwards. 431a013053dSRussell King */ 432a013053dSRussell King pg = PAGE_ALIGN(__pa(start_pg)); 433a013053dSRussell King pgend = __pa(end_pg) & PAGE_MASK; 434a013053dSRussell King 435a013053dSRussell King /* 436a013053dSRussell King * If there are free pages between these, 437a013053dSRussell King * free the section of the memmap array. 438a013053dSRussell King */ 439a013053dSRussell King if (pg < pgend) 440a013053dSRussell King free_bootmem_node(NODE_DATA(node), pg, pgend - pg); 441a013053dSRussell King } 442a013053dSRussell King 443a013053dSRussell King /* 444a013053dSRussell King * The mem_map array can get very big. Free the unused area of the memory map. 445a013053dSRussell King */ 446a013053dSRussell King static void __init free_unused_memmap_node(int node, struct meminfo *mi) 447a013053dSRussell King { 448a013053dSRussell King unsigned long bank_start, prev_bank_end = 0; 449a013053dSRussell King unsigned int i; 450a013053dSRussell King 451a013053dSRussell King /* 452a013053dSRussell King * [FIXME] This relies on each bank being in address order. This 453a013053dSRussell King * may not be the case, especially if the user has provided the 454a013053dSRussell King * information on the command line. 455a013053dSRussell King */ 45690072059SRussell King for_each_nodebank(i, mi, node) { 457d2a38ef9SRussell King struct membank *bank = &mi->bank[i]; 458d2a38ef9SRussell King 459d2a38ef9SRussell King bank_start = bank_pfn_start(bank); 460a013053dSRussell King if (bank_start < prev_bank_end) { 461a013053dSRussell King printk(KERN_ERR "MEM: unordered memory banks. " 462a013053dSRussell King "Not freeing memmap.\n"); 463a013053dSRussell King break; 464a013053dSRussell King } 465a013053dSRussell King 466a013053dSRussell King /* 467a013053dSRussell King * If we had a previous bank, and there is a space 468a013053dSRussell King * between the current bank and the previous, free it. 469a013053dSRussell King */ 470a013053dSRussell King if (prev_bank_end && prev_bank_end != bank_start) 471a013053dSRussell King free_memmap(node, prev_bank_end, bank_start); 472a013053dSRussell King 473d2a38ef9SRussell King prev_bank_end = bank_pfn_end(bank); 474a013053dSRussell King } 475a013053dSRussell King } 476a013053dSRussell King 4771da177e4SLinus Torvalds /* 4781da177e4SLinus Torvalds * mem_init() marks the free areas in the mem_map and tells us how much 4791da177e4SLinus Torvalds * memory is free. This is done after various parts of the system have 4801da177e4SLinus Torvalds * claimed their memory after the kernel image. 4811da177e4SLinus Torvalds */ 4821da177e4SLinus Torvalds void __init mem_init(void) 4831da177e4SLinus Torvalds { 4846db015e4SNicolas Pitre unsigned int codesize, datasize, initsize; 4851da177e4SLinus Torvalds int i, node; 4861da177e4SLinus Torvalds 4871da177e4SLinus Torvalds #ifndef CONFIG_DISCONTIGMEM 4881da177e4SLinus Torvalds max_mapnr = virt_to_page(high_memory) - mem_map; 4891da177e4SLinus Torvalds #endif 4901da177e4SLinus Torvalds 4911da177e4SLinus Torvalds /* this will put all unused low memory onto the freelists */ 4921da177e4SLinus Torvalds for_each_online_node(node) { 4931da177e4SLinus Torvalds pg_data_t *pgdat = NODE_DATA(node); 4941da177e4SLinus Torvalds 495a013053dSRussell King free_unused_memmap_node(node, &meminfo); 496a013053dSRussell King 4971da177e4SLinus Torvalds if (pgdat->node_spanned_pages != 0) 4981da177e4SLinus Torvalds totalram_pages += free_all_bootmem_node(pgdat); 4991da177e4SLinus Torvalds } 5001da177e4SLinus Torvalds 5011da177e4SLinus Torvalds #ifdef CONFIG_SA1111 5021da177e4SLinus Torvalds /* now that our DMA memory is actually so designated, we can free it */ 5036db015e4SNicolas Pitre totalram_pages += free_area(PHYS_PFN_OFFSET, 5046db015e4SNicolas Pitre __phys_to_pfn(__pa(swapper_pg_dir)), NULL); 5051da177e4SLinus Torvalds #endif 5061da177e4SLinus Torvalds 5071da177e4SLinus Torvalds /* 5081da177e4SLinus Torvalds * Since our memory may not be contiguous, calculate the 5091da177e4SLinus Torvalds * real number of pages we have in this system 5101da177e4SLinus Torvalds */ 5111da177e4SLinus Torvalds printk(KERN_INFO "Memory:"); 5121da177e4SLinus Torvalds num_physpages = 0; 5131da177e4SLinus Torvalds for (i = 0; i < meminfo.nr_banks; i++) { 514d2a38ef9SRussell King num_physpages += bank_pfn_size(&meminfo.bank[i]); 515d2a38ef9SRussell King printk(" %ldMB", bank_phys_size(&meminfo.bank[i]) >> 20); 5161da177e4SLinus Torvalds } 5171da177e4SLinus Torvalds printk(" = %luMB total\n", num_physpages >> (20 - PAGE_SHIFT)); 5186db015e4SNicolas Pitre 51937efe642SRussell King codesize = _etext - _text; 52037efe642SRussell King datasize = _end - _data; 52137efe642SRussell King initsize = __init_end - __init_begin; 5226db015e4SNicolas Pitre 5231da177e4SLinus Torvalds printk(KERN_NOTICE "Memory: %luKB available (%dK code, " 5241da177e4SLinus Torvalds "%dK data, %dK init)\n", 5251da177e4SLinus Torvalds (unsigned long) nr_free_pages() << (PAGE_SHIFT-10), 5266db015e4SNicolas Pitre codesize >> 10, datasize >> 10, initsize >> 10); 5271da177e4SLinus Torvalds 5281da177e4SLinus Torvalds if (PAGE_SIZE >= 16384 && num_physpages <= 128) { 5291da177e4SLinus Torvalds extern int sysctl_overcommit_memory; 5301da177e4SLinus Torvalds /* 5311da177e4SLinus Torvalds * On a machine this small we won't get 5321da177e4SLinus Torvalds * anywhere without overcommit, so turn 5331da177e4SLinus Torvalds * it on by default. 5341da177e4SLinus Torvalds */ 5351da177e4SLinus Torvalds sysctl_overcommit_memory = OVERCOMMIT_ALWAYS; 5361da177e4SLinus Torvalds } 5371da177e4SLinus Torvalds } 5381da177e4SLinus Torvalds 5391da177e4SLinus Torvalds void free_initmem(void) 5401da177e4SLinus Torvalds { 5416db015e4SNicolas Pitre if (!machine_is_integrator() && !machine_is_cintegrator()) 54237efe642SRussell King totalram_pages += free_area(__phys_to_pfn(__pa(__init_begin)), 54337efe642SRussell King __phys_to_pfn(__pa(__init_end)), 5441da177e4SLinus Torvalds "init"); 5451da177e4SLinus Torvalds } 5461da177e4SLinus Torvalds 5471da177e4SLinus Torvalds #ifdef CONFIG_BLK_DEV_INITRD 5481da177e4SLinus Torvalds 5491da177e4SLinus Torvalds static int keep_initrd; 5501da177e4SLinus Torvalds 5511da177e4SLinus Torvalds void free_initrd_mem(unsigned long start, unsigned long end) 5521da177e4SLinus Torvalds { 5531da177e4SLinus Torvalds if (!keep_initrd) 5546db015e4SNicolas Pitre totalram_pages += free_area(__phys_to_pfn(__pa(start)), 5556db015e4SNicolas Pitre __phys_to_pfn(__pa(end)), 5566db015e4SNicolas Pitre "initrd"); 5571da177e4SLinus Torvalds } 5581da177e4SLinus Torvalds 5591da177e4SLinus Torvalds static int __init keepinitrd_setup(char *__unused) 5601da177e4SLinus Torvalds { 5611da177e4SLinus Torvalds keep_initrd = 1; 5621da177e4SLinus Torvalds return 1; 5631da177e4SLinus Torvalds } 5641da177e4SLinus Torvalds 5651da177e4SLinus Torvalds __setup("keepinitrd", keepinitrd_setup); 5661da177e4SLinus Torvalds #endif 567