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> 183835f6cbSNicolas Pitre #include <linux/highmem.h> 191da177e4SLinus Torvalds 201da177e4SLinus Torvalds #include <asm/mach-types.h> 2137efe642SRussell King #include <asm/sections.h> 221da177e4SLinus Torvalds #include <asm/setup.h> 2374d02fb9SRussell King #include <asm/sizes.h> 241da177e4SLinus Torvalds #include <asm/tlb.h> 251da177e4SLinus Torvalds 261da177e4SLinus Torvalds #include <asm/mach/arch.h> 271da177e4SLinus Torvalds #include <asm/mach/map.h> 281da177e4SLinus Torvalds 291b2e2b73SRussell King #include "mm.h" 301b2e2b73SRussell King 31012d1f4aSRussell King static unsigned long phys_initrd_start __initdata = 0; 32012d1f4aSRussell King static unsigned long phys_initrd_size __initdata = 0; 33012d1f4aSRussell King 34012d1f4aSRussell King static void __init early_initrd(char **p) 35012d1f4aSRussell King { 36012d1f4aSRussell King unsigned long start, size; 37012d1f4aSRussell King 38012d1f4aSRussell King start = memparse(*p, p); 39012d1f4aSRussell King if (**p == ',') { 40012d1f4aSRussell King size = memparse((*p) + 1, p); 41012d1f4aSRussell King 42012d1f4aSRussell King phys_initrd_start = start; 43012d1f4aSRussell King phys_initrd_size = size; 44012d1f4aSRussell King } 45012d1f4aSRussell King } 46012d1f4aSRussell King __early_param("initrd=", early_initrd); 47012d1f4aSRussell King 48012d1f4aSRussell King static int __init parse_tag_initrd(const struct tag *tag) 49012d1f4aSRussell King { 50012d1f4aSRussell King printk(KERN_WARNING "ATAG_INITRD is deprecated; " 51012d1f4aSRussell King "please update your bootloader.\n"); 52012d1f4aSRussell King phys_initrd_start = __virt_to_phys(tag->u.initrd.start); 53012d1f4aSRussell King phys_initrd_size = tag->u.initrd.size; 54012d1f4aSRussell King return 0; 55012d1f4aSRussell King } 56012d1f4aSRussell King 57012d1f4aSRussell King __tagtable(ATAG_INITRD, parse_tag_initrd); 58012d1f4aSRussell King 59012d1f4aSRussell King static int __init parse_tag_initrd2(const struct tag *tag) 60012d1f4aSRussell King { 61012d1f4aSRussell King phys_initrd_start = tag->u.initrd.start; 62012d1f4aSRussell King phys_initrd_size = tag->u.initrd.size; 63012d1f4aSRussell King return 0; 64012d1f4aSRussell King } 65012d1f4aSRussell King 66012d1f4aSRussell King __tagtable(ATAG_INITRD2, parse_tag_initrd2); 671da177e4SLinus Torvalds 681da177e4SLinus Torvalds /* 694b5f32ceSNicolas Pitre * This keeps memory configuration data used by a couple memory 704b5f32ceSNicolas Pitre * initialization functions, as well as show_mem() for the skipping 714b5f32ceSNicolas Pitre * of holes in the memory map. It is populated by arm_add_memory(). 721da177e4SLinus Torvalds */ 734b5f32ceSNicolas Pitre struct meminfo meminfo; 745e709827SRay Lehtiniemi 751da177e4SLinus Torvalds void show_mem(void) 761da177e4SLinus Torvalds { 771da177e4SLinus Torvalds int free = 0, total = 0, reserved = 0; 785e709827SRay Lehtiniemi int shared = 0, cached = 0, slab = 0, node, i; 795e709827SRay Lehtiniemi struct meminfo * mi = &meminfo; 801da177e4SLinus Torvalds 811da177e4SLinus Torvalds printk("Mem-info:\n"); 821da177e4SLinus Torvalds show_free_areas(); 831da177e4SLinus Torvalds for_each_online_node(node) { 84204ecae4SRussell King pg_data_t *n = NODE_DATA(node); 85b7a69ac3SRussell King struct page *map = pgdat_page_nr(n, 0) - n->node_start_pfn; 86204ecae4SRussell King 875e709827SRay Lehtiniemi for_each_nodebank (i,mi,node) { 88d2a38ef9SRussell King struct membank *bank = &mi->bank[i]; 895e709827SRay Lehtiniemi unsigned int pfn1, pfn2; 901da177e4SLinus Torvalds struct page *page, *end; 911da177e4SLinus Torvalds 92d2a38ef9SRussell King pfn1 = bank_pfn_start(bank); 93d2a38ef9SRussell King pfn2 = bank_pfn_end(bank); 945e709827SRay Lehtiniemi 95204ecae4SRussell King page = map + pfn1; 96204ecae4SRussell King end = map + pfn2; 971da177e4SLinus Torvalds 981da177e4SLinus Torvalds do { 991da177e4SLinus Torvalds total++; 1001da177e4SLinus Torvalds if (PageReserved(page)) 1011da177e4SLinus Torvalds reserved++; 1021da177e4SLinus Torvalds else if (PageSwapCache(page)) 1031da177e4SLinus Torvalds cached++; 1041da177e4SLinus Torvalds else if (PageSlab(page)) 1051da177e4SLinus Torvalds slab++; 1061da177e4SLinus Torvalds else if (!page_count(page)) 1071da177e4SLinus Torvalds free++; 1081da177e4SLinus Torvalds else 1091da177e4SLinus Torvalds shared += page_count(page) - 1; 1101da177e4SLinus Torvalds page++; 1111da177e4SLinus Torvalds } while (page < end); 1121da177e4SLinus Torvalds } 1135e709827SRay Lehtiniemi } 1141da177e4SLinus Torvalds 1151da177e4SLinus Torvalds printk("%d pages of RAM\n", total); 1161da177e4SLinus Torvalds printk("%d free pages\n", free); 1171da177e4SLinus Torvalds printk("%d reserved pages\n", reserved); 1181da177e4SLinus Torvalds printk("%d slab pages\n", slab); 1191da177e4SLinus Torvalds printk("%d pages shared\n", shared); 1201da177e4SLinus Torvalds printk("%d pages swap cached\n", cached); 1211da177e4SLinus Torvalds } 1221da177e4SLinus Torvalds 1231da177e4SLinus Torvalds /* 1241da177e4SLinus Torvalds * FIXME: We really want to avoid allocating the bootmap bitmap 1251da177e4SLinus Torvalds * over the top of the initrd. Hopefully, this is located towards 1261da177e4SLinus Torvalds * the start of a bank, so if we allocate the bootmap bitmap at 1271da177e4SLinus Torvalds * the end, we won't clash. 1281da177e4SLinus Torvalds */ 1291da177e4SLinus Torvalds static unsigned int __init 1301da177e4SLinus Torvalds find_bootmap_pfn(int node, struct meminfo *mi, unsigned int bootmap_pages) 1311da177e4SLinus Torvalds { 132d2a38ef9SRussell King unsigned int start_pfn, i, bootmap_pfn; 1331da177e4SLinus Torvalds 13437efe642SRussell King start_pfn = PAGE_ALIGN(__pa(_end)) >> PAGE_SHIFT; 1351da177e4SLinus Torvalds bootmap_pfn = 0; 1361da177e4SLinus Torvalds 137d2a38ef9SRussell King for_each_nodebank(i, mi, node) { 138d2a38ef9SRussell King struct membank *bank = &mi->bank[i]; 1391da177e4SLinus Torvalds unsigned int start, end; 1401da177e4SLinus Torvalds 141d2a38ef9SRussell King start = bank_pfn_start(bank); 142d2a38ef9SRussell King end = bank_pfn_end(bank); 1431da177e4SLinus Torvalds 1441da177e4SLinus Torvalds if (end < start_pfn) 1451da177e4SLinus Torvalds continue; 1461da177e4SLinus Torvalds 1471da177e4SLinus Torvalds if (start < start_pfn) 1481da177e4SLinus Torvalds start = start_pfn; 1491da177e4SLinus Torvalds 1501da177e4SLinus Torvalds if (end <= start) 1511da177e4SLinus Torvalds continue; 1521da177e4SLinus Torvalds 1531da177e4SLinus Torvalds if (end - start >= bootmap_pages) { 1541da177e4SLinus Torvalds bootmap_pfn = start; 1551da177e4SLinus Torvalds break; 1561da177e4SLinus Torvalds } 1571da177e4SLinus Torvalds } 1581da177e4SLinus Torvalds 1591da177e4SLinus Torvalds if (bootmap_pfn == 0) 1601da177e4SLinus Torvalds BUG(); 1611da177e4SLinus Torvalds 1621da177e4SLinus Torvalds return bootmap_pfn; 1631da177e4SLinus Torvalds } 1641da177e4SLinus Torvalds 1651da177e4SLinus Torvalds static int __init check_initrd(struct meminfo *mi) 1661da177e4SLinus Torvalds { 1671da177e4SLinus Torvalds int initrd_node = -2; 1681da177e4SLinus Torvalds #ifdef CONFIG_BLK_DEV_INITRD 1691da177e4SLinus Torvalds unsigned long end = phys_initrd_start + phys_initrd_size; 1701da177e4SLinus Torvalds 1711da177e4SLinus Torvalds /* 1721da177e4SLinus Torvalds * Make sure that the initrd is within a valid area of 1731da177e4SLinus Torvalds * memory. 1741da177e4SLinus Torvalds */ 1751da177e4SLinus Torvalds if (phys_initrd_size) { 1761da177e4SLinus Torvalds unsigned int i; 1771da177e4SLinus Torvalds 1781da177e4SLinus Torvalds initrd_node = -1; 1791da177e4SLinus Torvalds 1801da177e4SLinus Torvalds for (i = 0; i < mi->nr_banks; i++) { 181d2a38ef9SRussell King struct membank *bank = &mi->bank[i]; 182d2a38ef9SRussell King if (bank_phys_start(bank) <= phys_initrd_start && 183d2a38ef9SRussell King end <= bank_phys_end(bank)) 184d2a38ef9SRussell King initrd_node = bank->node; 1851da177e4SLinus Torvalds } 1861da177e4SLinus Torvalds } 1871da177e4SLinus Torvalds 1881da177e4SLinus Torvalds if (initrd_node == -1) { 189b962a286SRussell King printk(KERN_ERR "INITRD: 0x%08lx+0x%08lx extends beyond " 1901da177e4SLinus Torvalds "physical memory - disabling initrd\n", 191b962a286SRussell King phys_initrd_start, phys_initrd_size); 1921da177e4SLinus Torvalds phys_initrd_start = phys_initrd_size = 0; 1931da177e4SLinus Torvalds } 1941da177e4SLinus Torvalds #endif 1951da177e4SLinus Torvalds 1961da177e4SLinus Torvalds return initrd_node; 1971da177e4SLinus Torvalds } 1981da177e4SLinus Torvalds 199456335e2SRussell King static inline void map_memory_bank(struct membank *bank) 200456335e2SRussell King { 201d111e8f9SRussell King #ifdef CONFIG_MMU 202456335e2SRussell King struct map_desc map; 203456335e2SRussell King 204d2a38ef9SRussell King map.pfn = bank_pfn_start(bank); 205d2a38ef9SRussell King map.virtual = __phys_to_virt(bank_phys_start(bank)); 206d2a38ef9SRussell King map.length = bank_phys_size(bank); 207456335e2SRussell King map.type = MT_MEMORY; 208456335e2SRussell King 209456335e2SRussell King create_mapping(&map); 210d111e8f9SRussell King #endif 211456335e2SRussell King } 212456335e2SRussell King 213b7a69ac3SRussell King static unsigned long __init bootmem_init_node(int node, struct meminfo *mi) 2141da177e4SLinus Torvalds { 21590072059SRussell King unsigned long start_pfn, end_pfn, boot_pfn; 21690072059SRussell King unsigned int boot_pages; 21790072059SRussell King pg_data_t *pgdat; 21890072059SRussell King int i; 2191da177e4SLinus Torvalds 22090072059SRussell King start_pfn = -1UL; 22190072059SRussell King end_pfn = 0; 22290072059SRussell King 22390072059SRussell King /* 22490072059SRussell King * Calculate the pfn range, and map the memory banks for this node. 22590072059SRussell King */ 22690072059SRussell King for_each_nodebank(i, mi, node) { 227456335e2SRussell King struct membank *bank = &mi->bank[i]; 22890072059SRussell King unsigned long start, end; 22990072059SRussell King 230d2a38ef9SRussell King start = bank_pfn_start(bank); 231d2a38ef9SRussell King end = bank_pfn_end(bank); 23290072059SRussell King 23390072059SRussell King if (start_pfn > start) 23490072059SRussell King start_pfn = start; 23590072059SRussell King if (end_pfn < end) 23690072059SRussell King end_pfn = end; 23790072059SRussell King 238456335e2SRussell King map_memory_bank(bank); 2391da177e4SLinus Torvalds } 2401da177e4SLinus Torvalds 2411da177e4SLinus Torvalds /* 24290072059SRussell King * If there is no memory in this node, ignore it. 2431da177e4SLinus Torvalds */ 24490072059SRussell King if (end_pfn == 0) 24590072059SRussell King return end_pfn; 2461da177e4SLinus Torvalds 2471da177e4SLinus Torvalds /* 24890072059SRussell King * Allocate the bootmem bitmap page. 2491da177e4SLinus Torvalds */ 25090072059SRussell King boot_pages = bootmem_bootmap_pages(end_pfn - start_pfn); 25190072059SRussell King boot_pfn = find_bootmap_pfn(node, mi, boot_pages); 2521da177e4SLinus Torvalds 2531da177e4SLinus Torvalds /* 25490072059SRussell King * Initialise the bootmem allocator for this node, handing the 25590072059SRussell King * memory banks over to bootmem. 2561da177e4SLinus Torvalds */ 25790072059SRussell King node_set_online(node); 25890072059SRussell King pgdat = NODE_DATA(node); 25990072059SRussell King init_bootmem_node(pgdat, boot_pfn, start_pfn, end_pfn); 26090072059SRussell King 261d2a38ef9SRussell King for_each_nodebank(i, mi, node) { 262d2a38ef9SRussell King struct membank *bank = &mi->bank[i]; 263d2a38ef9SRussell King free_bootmem_node(pgdat, bank_phys_start(bank), bank_phys_size(bank)); 264b7a69ac3SRussell King memory_present(node, bank_pfn_start(bank), bank_pfn_end(bank)); 265d2a38ef9SRussell King } 2661da177e4SLinus Torvalds 2671da177e4SLinus Torvalds /* 26890072059SRussell King * Reserve the bootmem bitmap for this node. 2691da177e4SLinus Torvalds */ 27090072059SRussell King reserve_bootmem_node(pgdat, boot_pfn << PAGE_SHIFT, 27172a7fe39SBernhard Walle boot_pages << PAGE_SHIFT, BOOTMEM_DEFAULT); 2721da177e4SLinus Torvalds 273b7a69ac3SRussell King return end_pfn; 274b7a69ac3SRussell King } 275b962a286SRussell King 276b7a69ac3SRussell King static void __init bootmem_reserve_initrd(int node) 277b7a69ac3SRussell King { 2781da177e4SLinus Torvalds #ifdef CONFIG_BLK_DEV_INITRD 279b7a69ac3SRussell King pg_data_t *pgdat = NODE_DATA(node); 280b7a69ac3SRussell King int res; 281b7a69ac3SRussell King 282b7a69ac3SRussell King res = reserve_bootmem_node(pgdat, phys_initrd_start, 283b962a286SRussell King phys_initrd_size, BOOTMEM_EXCLUSIVE); 284b962a286SRussell King 285b962a286SRussell King if (res == 0) { 2861da177e4SLinus Torvalds initrd_start = __phys_to_virt(phys_initrd_start); 2871da177e4SLinus Torvalds initrd_end = initrd_start + phys_initrd_size; 288b962a286SRussell King } else { 289b962a286SRussell King printk(KERN_ERR 290b962a286SRussell King "INITRD: 0x%08lx+0x%08lx overlaps in-use " 291b962a286SRussell King "memory region - disabling initrd\n", 292b962a286SRussell King phys_initrd_start, phys_initrd_size); 293b962a286SRussell King } 2941da177e4SLinus Torvalds #endif 295b7a69ac3SRussell King } 296b7a69ac3SRussell King 297b7a69ac3SRussell King static void __init bootmem_free_node(int node, struct meminfo *mi) 298b7a69ac3SRussell King { 299b7a69ac3SRussell King unsigned long zone_size[MAX_NR_ZONES], zhole_size[MAX_NR_ZONES]; 300b7a69ac3SRussell King unsigned long start_pfn, end_pfn; 301b7a69ac3SRussell King pg_data_t *pgdat = NODE_DATA(node); 302b7a69ac3SRussell King int i; 303b7a69ac3SRussell King 304b7a69ac3SRussell King start_pfn = pgdat->bdata->node_min_pfn; 305b7a69ac3SRussell King end_pfn = pgdat->bdata->node_low_pfn; 3061da177e4SLinus Torvalds 30790072059SRussell King /* 30890072059SRussell King * initialise the zones within this node. 30990072059SRussell King */ 31090072059SRussell King memset(zone_size, 0, sizeof(zone_size)); 31190072059SRussell King memset(zhole_size, 0, sizeof(zhole_size)); 31290072059SRussell King 31390072059SRussell King /* 31490072059SRussell King * The size of this node has already been determined. If we need 31590072059SRussell King * to do anything fancy with the allocation of this memory to the 31690072059SRussell King * zones, now is the time to do it. 31790072059SRussell King */ 31890072059SRussell King zone_size[0] = end_pfn - start_pfn; 31990072059SRussell King 32090072059SRussell King /* 32190072059SRussell King * For each bank in this node, calculate the size of the holes. 32290072059SRussell King * holes = node_size - sum(bank_sizes_in_node) 32390072059SRussell King */ 32490072059SRussell King zhole_size[0] = zone_size[0]; 32590072059SRussell King for_each_nodebank(i, mi, node) 326d2a38ef9SRussell King zhole_size[0] -= bank_pfn_size(&mi->bank[i]); 32790072059SRussell King 32890072059SRussell King /* 32990072059SRussell King * Adjust the sizes according to any special requirements for 33090072059SRussell King * this machine type. 33190072059SRussell King */ 33290072059SRussell King arch_adjust_zones(node, zone_size, zhole_size); 33390072059SRussell King 3349109fb7bSJohannes Weiner free_area_init_node(node, zone_size, start_pfn, zhole_size); 33590072059SRussell King } 33690072059SRussell King 3374b5f32ceSNicolas Pitre void __init bootmem_init(void) 33890072059SRussell King { 3394b5f32ceSNicolas Pitre struct meminfo *mi = &meminfo; 340456335e2SRussell King unsigned long memend_pfn = 0; 341eca73214SRussell King int node, initrd_node; 34290072059SRussell King 34390072059SRussell King /* 34490072059SRussell King * Locate which node contains the ramdisk image, if any. 34590072059SRussell King */ 34690072059SRussell King initrd_node = check_initrd(mi); 34790072059SRussell King 34890072059SRussell King /* 34990072059SRussell King * Run through each node initialising the bootmem allocator. 35090072059SRussell King */ 35190072059SRussell King for_each_node(node) { 352b7a69ac3SRussell King unsigned long end_pfn = bootmem_init_node(node, mi); 35390072059SRussell King 354b7a69ac3SRussell King /* 355b7a69ac3SRussell King * Reserve any special node zero regions. 356b7a69ac3SRussell King */ 357b7a69ac3SRussell King if (node == 0) 358b7a69ac3SRussell King reserve_node_zero(NODE_DATA(node)); 359b7a69ac3SRussell King 360b7a69ac3SRussell King /* 361b7a69ac3SRussell King * If the initrd is in this node, reserve its memory. 362b7a69ac3SRussell King */ 363b7a69ac3SRussell King if (node == initrd_node) 364b7a69ac3SRussell King bootmem_reserve_initrd(node); 36590072059SRussell King 36690072059SRussell King /* 36790072059SRussell King * Remember the highest memory PFN. 36890072059SRussell King */ 36990072059SRussell King if (end_pfn > memend_pfn) 37090072059SRussell King memend_pfn = end_pfn; 37190072059SRussell King } 37290072059SRussell King 373b7a69ac3SRussell King /* 374b7a69ac3SRussell King * sparse_init() needs the bootmem allocator up and running. 375b7a69ac3SRussell King */ 376b7a69ac3SRussell King sparse_init(); 377b7a69ac3SRussell King 378b7a69ac3SRussell King /* 379b7a69ac3SRussell King * Now free memory in each node - free_area_init_node needs 380b7a69ac3SRussell King * the sparse mem_map arrays initialized by sparse_init() 381b7a69ac3SRussell King * for memmap_init_zone(), otherwise all PFNs are invalid. 382b7a69ac3SRussell King */ 383b7a69ac3SRussell King for_each_node(node) 384b7a69ac3SRussell King bootmem_free_node(node, mi); 385b7a69ac3SRussell King 3861522ac3eSRussell King high_memory = __va((memend_pfn << PAGE_SHIFT) - 1) + 1; 38790072059SRussell King 38890072059SRussell King /* 38990072059SRussell King * This doesn't seem to be used by the Linux memory manager any 39090072059SRussell King * more, but is used by ll_rw_block. If we can get rid of it, we 39190072059SRussell King * also get rid of some of the stuff above as well. 39290072059SRussell King * 39390072059SRussell King * Note: max_low_pfn and max_pfn reflect the number of _pages_ in 39490072059SRussell King * the system, not the maximum PFN. 39590072059SRussell King */ 39690072059SRussell King max_pfn = max_low_pfn = memend_pfn - PHYS_PFN_OFFSET; 39790072059SRussell King } 39890072059SRussell King 3996db015e4SNicolas Pitre static inline int free_area(unsigned long pfn, unsigned long end, char *s) 4001da177e4SLinus Torvalds { 4016db015e4SNicolas Pitre unsigned int pages = 0, size = (end - pfn) << (PAGE_SHIFT - 10); 4021da177e4SLinus Torvalds 4036db015e4SNicolas Pitre for (; pfn < end; pfn++) { 4046db015e4SNicolas Pitre struct page *page = pfn_to_page(pfn); 4051da177e4SLinus Torvalds ClearPageReserved(page); 4067835e98bSNick Piggin init_page_count(page); 4076db015e4SNicolas Pitre __free_page(page); 4086db015e4SNicolas Pitre pages++; 4091da177e4SLinus Torvalds } 4101da177e4SLinus Torvalds 4111da177e4SLinus Torvalds if (size && s) 4121da177e4SLinus Torvalds printk(KERN_INFO "Freeing %s memory: %dK\n", s, size); 4136db015e4SNicolas Pitre 4146db015e4SNicolas Pitre return pages; 4151da177e4SLinus Torvalds } 4161da177e4SLinus Torvalds 417a013053dSRussell King static inline void 418a013053dSRussell King free_memmap(int node, unsigned long start_pfn, unsigned long end_pfn) 419a013053dSRussell King { 420a013053dSRussell King struct page *start_pg, *end_pg; 421a013053dSRussell King unsigned long pg, pgend; 422a013053dSRussell King 423a013053dSRussell King /* 424a013053dSRussell King * Convert start_pfn/end_pfn to a struct page pointer. 425a013053dSRussell King */ 426a013053dSRussell King start_pg = pfn_to_page(start_pfn); 427a013053dSRussell King end_pg = pfn_to_page(end_pfn); 428a013053dSRussell King 429a013053dSRussell King /* 430a013053dSRussell King * Convert to physical addresses, and 431a013053dSRussell King * round start upwards and end downwards. 432a013053dSRussell King */ 433a013053dSRussell King pg = PAGE_ALIGN(__pa(start_pg)); 434a013053dSRussell King pgend = __pa(end_pg) & PAGE_MASK; 435a013053dSRussell King 436a013053dSRussell King /* 437a013053dSRussell King * If there are free pages between these, 438a013053dSRussell King * free the section of the memmap array. 439a013053dSRussell King */ 440a013053dSRussell King if (pg < pgend) 441a013053dSRussell King free_bootmem_node(NODE_DATA(node), pg, pgend - pg); 442a013053dSRussell King } 443a013053dSRussell King 444a013053dSRussell King /* 445a013053dSRussell King * The mem_map array can get very big. Free the unused area of the memory map. 446a013053dSRussell King */ 447a013053dSRussell King static void __init free_unused_memmap_node(int node, struct meminfo *mi) 448a013053dSRussell King { 449a013053dSRussell King unsigned long bank_start, prev_bank_end = 0; 450a013053dSRussell King unsigned int i; 451a013053dSRussell King 452a013053dSRussell King /* 453a013053dSRussell King * [FIXME] This relies on each bank being in address order. This 454a013053dSRussell King * may not be the case, especially if the user has provided the 455a013053dSRussell King * information on the command line. 456a013053dSRussell King */ 45790072059SRussell King for_each_nodebank(i, mi, node) { 458d2a38ef9SRussell King struct membank *bank = &mi->bank[i]; 459d2a38ef9SRussell King 460d2a38ef9SRussell King bank_start = bank_pfn_start(bank); 461a013053dSRussell King if (bank_start < prev_bank_end) { 462a013053dSRussell King printk(KERN_ERR "MEM: unordered memory banks. " 463a013053dSRussell King "Not freeing memmap.\n"); 464a013053dSRussell King break; 465a013053dSRussell King } 466a013053dSRussell King 467a013053dSRussell King /* 468a013053dSRussell King * If we had a previous bank, and there is a space 469a013053dSRussell King * between the current bank and the previous, free it. 470a013053dSRussell King */ 471a013053dSRussell King if (prev_bank_end && prev_bank_end != bank_start) 472a013053dSRussell King free_memmap(node, prev_bank_end, bank_start); 473a013053dSRussell King 474d2a38ef9SRussell King prev_bank_end = bank_pfn_end(bank); 475a013053dSRussell King } 476a013053dSRussell King } 477a013053dSRussell King 4781da177e4SLinus Torvalds /* 4791da177e4SLinus Torvalds * mem_init() marks the free areas in the mem_map and tells us how much 4801da177e4SLinus Torvalds * memory is free. This is done after various parts of the system have 4811da177e4SLinus Torvalds * claimed their memory after the kernel image. 4821da177e4SLinus Torvalds */ 4831da177e4SLinus Torvalds void __init mem_init(void) 4841da177e4SLinus Torvalds { 4856db015e4SNicolas Pitre unsigned int codesize, datasize, initsize; 4861da177e4SLinus Torvalds int i, node; 4871da177e4SLinus Torvalds 4881da177e4SLinus Torvalds #ifndef CONFIG_DISCONTIGMEM 4893835f6cbSNicolas Pitre max_mapnr = pfn_to_page(max_pfn + PHYS_PFN_OFFSET) - mem_map; 4901da177e4SLinus Torvalds #endif 4911da177e4SLinus Torvalds 4921da177e4SLinus Torvalds /* this will put all unused low memory onto the freelists */ 4931da177e4SLinus Torvalds for_each_online_node(node) { 4941da177e4SLinus Torvalds pg_data_t *pgdat = NODE_DATA(node); 4951da177e4SLinus Torvalds 496a013053dSRussell King free_unused_memmap_node(node, &meminfo); 497a013053dSRussell King 4981da177e4SLinus Torvalds if (pgdat->node_spanned_pages != 0) 4991da177e4SLinus Torvalds totalram_pages += free_all_bootmem_node(pgdat); 5001da177e4SLinus Torvalds } 5011da177e4SLinus Torvalds 5021da177e4SLinus Torvalds #ifdef CONFIG_SA1111 5031da177e4SLinus Torvalds /* now that our DMA memory is actually so designated, we can free it */ 5046db015e4SNicolas Pitre totalram_pages += free_area(PHYS_PFN_OFFSET, 5056db015e4SNicolas Pitre __phys_to_pfn(__pa(swapper_pg_dir)), NULL); 5061da177e4SLinus Torvalds #endif 5071da177e4SLinus Torvalds 5083835f6cbSNicolas Pitre #ifdef CONFIG_HIGHMEM 5093835f6cbSNicolas Pitre /* set highmem page free */ 5103835f6cbSNicolas Pitre for_each_online_node(node) { 5113835f6cbSNicolas Pitre for_each_nodebank (i, &meminfo, node) { 5123835f6cbSNicolas Pitre unsigned long start = bank_pfn_start(&meminfo.bank[i]); 5133835f6cbSNicolas Pitre unsigned long end = bank_pfn_end(&meminfo.bank[i]); 5143835f6cbSNicolas Pitre if (start >= max_low_pfn + PHYS_PFN_OFFSET) 5153835f6cbSNicolas Pitre totalhigh_pages += free_area(start, end, NULL); 5163835f6cbSNicolas Pitre } 5173835f6cbSNicolas Pitre } 5183835f6cbSNicolas Pitre totalram_pages += totalhigh_pages; 5193835f6cbSNicolas Pitre #endif 5203835f6cbSNicolas Pitre 5211da177e4SLinus Torvalds /* 5221da177e4SLinus Torvalds * Since our memory may not be contiguous, calculate the 5231da177e4SLinus Torvalds * real number of pages we have in this system 5241da177e4SLinus Torvalds */ 5251da177e4SLinus Torvalds printk(KERN_INFO "Memory:"); 5261da177e4SLinus Torvalds num_physpages = 0; 5271da177e4SLinus Torvalds for (i = 0; i < meminfo.nr_banks; i++) { 528d2a38ef9SRussell King num_physpages += bank_pfn_size(&meminfo.bank[i]); 529d2a38ef9SRussell King printk(" %ldMB", bank_phys_size(&meminfo.bank[i]) >> 20); 5301da177e4SLinus Torvalds } 5311da177e4SLinus Torvalds printk(" = %luMB total\n", num_physpages >> (20 - PAGE_SHIFT)); 5326db015e4SNicolas Pitre 53337efe642SRussell King codesize = _etext - _text; 53437efe642SRussell King datasize = _end - _data; 53537efe642SRussell King initsize = __init_end - __init_begin; 5366db015e4SNicolas Pitre 5371da177e4SLinus Torvalds printk(KERN_NOTICE "Memory: %luKB available (%dK code, " 5383835f6cbSNicolas Pitre "%dK data, %dK init, %luK highmem)\n", 5391da177e4SLinus Torvalds (unsigned long) nr_free_pages() << (PAGE_SHIFT-10), 5403835f6cbSNicolas Pitre codesize >> 10, datasize >> 10, initsize >> 10, 5413835f6cbSNicolas Pitre (unsigned long) (totalhigh_pages << (PAGE_SHIFT-10))); 5421da177e4SLinus Torvalds 5431da177e4SLinus Torvalds if (PAGE_SIZE >= 16384 && num_physpages <= 128) { 5441da177e4SLinus Torvalds extern int sysctl_overcommit_memory; 5451da177e4SLinus Torvalds /* 5461da177e4SLinus Torvalds * On a machine this small we won't get 5471da177e4SLinus Torvalds * anywhere without overcommit, so turn 5481da177e4SLinus Torvalds * it on by default. 5491da177e4SLinus Torvalds */ 5501da177e4SLinus Torvalds sysctl_overcommit_memory = OVERCOMMIT_ALWAYS; 5511da177e4SLinus Torvalds } 5521da177e4SLinus Torvalds } 5531da177e4SLinus Torvalds 5541da177e4SLinus Torvalds void free_initmem(void) 5551da177e4SLinus Torvalds { 5566db015e4SNicolas Pitre if (!machine_is_integrator() && !machine_is_cintegrator()) 55737efe642SRussell King totalram_pages += free_area(__phys_to_pfn(__pa(__init_begin)), 55837efe642SRussell King __phys_to_pfn(__pa(__init_end)), 5591da177e4SLinus Torvalds "init"); 5601da177e4SLinus Torvalds } 5611da177e4SLinus Torvalds 5621da177e4SLinus Torvalds #ifdef CONFIG_BLK_DEV_INITRD 5631da177e4SLinus Torvalds 5641da177e4SLinus Torvalds static int keep_initrd; 5651da177e4SLinus Torvalds 5661da177e4SLinus Torvalds void free_initrd_mem(unsigned long start, unsigned long end) 5671da177e4SLinus Torvalds { 5681da177e4SLinus Torvalds if (!keep_initrd) 5696db015e4SNicolas Pitre totalram_pages += free_area(__phys_to_pfn(__pa(start)), 5706db015e4SNicolas Pitre __phys_to_pfn(__pa(end)), 5716db015e4SNicolas Pitre "initrd"); 5721da177e4SLinus Torvalds } 5731da177e4SLinus Torvalds 5741da177e4SLinus Torvalds static int __init keepinitrd_setup(char *__unused) 5751da177e4SLinus Torvalds { 5761da177e4SLinus Torvalds keep_initrd = 1; 5771da177e4SLinus Torvalds return 1; 5781da177e4SLinus Torvalds } 5791da177e4SLinus Torvalds 5801da177e4SLinus Torvalds __setup("keepinitrd", keepinitrd_setup); 5811da177e4SLinus Torvalds #endif 582