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 123dde5828fSRussell King static void __init find_node_limits(int node, struct meminfo *mi, 124dde5828fSRussell King unsigned long *min, unsigned long *max_low, unsigned long *max_high) 125dde5828fSRussell King { 126dde5828fSRussell King int i; 127dde5828fSRussell King 128dde5828fSRussell King *min = -1UL; 129dde5828fSRussell King *max_low = *max_high = 0; 130dde5828fSRussell King 131dde5828fSRussell King for_each_nodebank(i, mi, node) { 132dde5828fSRussell King struct membank *bank = &mi->bank[i]; 133dde5828fSRussell King unsigned long start, end; 134dde5828fSRussell King 135dde5828fSRussell King start = bank_pfn_start(bank); 136dde5828fSRussell King end = bank_pfn_end(bank); 137dde5828fSRussell King 138dde5828fSRussell King if (*min > start) 139dde5828fSRussell King *min = start; 140dde5828fSRussell King if (*max_high < end) 141dde5828fSRussell King *max_high = end; 142dde5828fSRussell King if (bank->highmem) 143dde5828fSRussell King continue; 144dde5828fSRussell King if (*max_low < end) 145dde5828fSRussell King *max_low = end; 146dde5828fSRussell King } 147dde5828fSRussell King } 148dde5828fSRussell King 1491da177e4SLinus Torvalds /* 1501da177e4SLinus Torvalds * FIXME: We really want to avoid allocating the bootmap bitmap 1511da177e4SLinus Torvalds * over the top of the initrd. Hopefully, this is located towards 1521da177e4SLinus Torvalds * the start of a bank, so if we allocate the bootmap bitmap at 1531da177e4SLinus Torvalds * the end, we won't clash. 1541da177e4SLinus Torvalds */ 1551da177e4SLinus Torvalds static unsigned int __init 1561da177e4SLinus Torvalds find_bootmap_pfn(int node, struct meminfo *mi, unsigned int bootmap_pages) 1571da177e4SLinus Torvalds { 158d2a38ef9SRussell King unsigned int start_pfn, i, bootmap_pfn; 1591da177e4SLinus Torvalds 16037efe642SRussell King start_pfn = PAGE_ALIGN(__pa(_end)) >> PAGE_SHIFT; 1611da177e4SLinus Torvalds bootmap_pfn = 0; 1621da177e4SLinus Torvalds 163d2a38ef9SRussell King for_each_nodebank(i, mi, node) { 164d2a38ef9SRussell King struct membank *bank = &mi->bank[i]; 1651da177e4SLinus Torvalds unsigned int start, end; 1661da177e4SLinus Torvalds 167d2a38ef9SRussell King start = bank_pfn_start(bank); 168d2a38ef9SRussell King end = bank_pfn_end(bank); 1691da177e4SLinus Torvalds 1701da177e4SLinus Torvalds if (end < start_pfn) 1711da177e4SLinus Torvalds continue; 1721da177e4SLinus Torvalds 1731da177e4SLinus Torvalds if (start < start_pfn) 1741da177e4SLinus Torvalds start = start_pfn; 1751da177e4SLinus Torvalds 1761da177e4SLinus Torvalds if (end <= start) 1771da177e4SLinus Torvalds continue; 1781da177e4SLinus Torvalds 1791da177e4SLinus Torvalds if (end - start >= bootmap_pages) { 1801da177e4SLinus Torvalds bootmap_pfn = start; 1811da177e4SLinus Torvalds break; 1821da177e4SLinus Torvalds } 1831da177e4SLinus Torvalds } 1841da177e4SLinus Torvalds 1851da177e4SLinus Torvalds if (bootmap_pfn == 0) 1861da177e4SLinus Torvalds BUG(); 1871da177e4SLinus Torvalds 1881da177e4SLinus Torvalds return bootmap_pfn; 1891da177e4SLinus Torvalds } 1901da177e4SLinus Torvalds 1911da177e4SLinus Torvalds static int __init check_initrd(struct meminfo *mi) 1921da177e4SLinus Torvalds { 1931da177e4SLinus Torvalds int initrd_node = -2; 1941da177e4SLinus Torvalds #ifdef CONFIG_BLK_DEV_INITRD 1951da177e4SLinus Torvalds unsigned long end = phys_initrd_start + phys_initrd_size; 1961da177e4SLinus Torvalds 1971da177e4SLinus Torvalds /* 1981da177e4SLinus Torvalds * Make sure that the initrd is within a valid area of 1991da177e4SLinus Torvalds * memory. 2001da177e4SLinus Torvalds */ 2011da177e4SLinus Torvalds if (phys_initrd_size) { 2021da177e4SLinus Torvalds unsigned int i; 2031da177e4SLinus Torvalds 2041da177e4SLinus Torvalds initrd_node = -1; 2051da177e4SLinus Torvalds 2061da177e4SLinus Torvalds for (i = 0; i < mi->nr_banks; i++) { 207d2a38ef9SRussell King struct membank *bank = &mi->bank[i]; 208d2a38ef9SRussell King if (bank_phys_start(bank) <= phys_initrd_start && 209d2a38ef9SRussell King end <= bank_phys_end(bank)) 210d2a38ef9SRussell King initrd_node = bank->node; 2111da177e4SLinus Torvalds } 2121da177e4SLinus Torvalds } 2131da177e4SLinus Torvalds 2141da177e4SLinus Torvalds if (initrd_node == -1) { 215b962a286SRussell King printk(KERN_ERR "INITRD: 0x%08lx+0x%08lx extends beyond " 2161da177e4SLinus Torvalds "physical memory - disabling initrd\n", 217b962a286SRussell King phys_initrd_start, phys_initrd_size); 2181da177e4SLinus Torvalds phys_initrd_start = phys_initrd_size = 0; 2191da177e4SLinus Torvalds } 2201da177e4SLinus Torvalds #endif 2211da177e4SLinus Torvalds 2221da177e4SLinus Torvalds return initrd_node; 2231da177e4SLinus Torvalds } 2241da177e4SLinus Torvalds 225456335e2SRussell King static inline void map_memory_bank(struct membank *bank) 226456335e2SRussell King { 227d111e8f9SRussell King #ifdef CONFIG_MMU 228456335e2SRussell King struct map_desc map; 229456335e2SRussell King 230d2a38ef9SRussell King map.pfn = bank_pfn_start(bank); 231d2a38ef9SRussell King map.virtual = __phys_to_virt(bank_phys_start(bank)); 232d2a38ef9SRussell King map.length = bank_phys_size(bank); 233456335e2SRussell King map.type = MT_MEMORY; 234456335e2SRussell King 235456335e2SRussell King create_mapping(&map); 236d111e8f9SRussell King #endif 237456335e2SRussell King } 238456335e2SRussell King 239dde5828fSRussell King static void __init bootmem_init_node(int node, struct meminfo *mi, 240dde5828fSRussell King unsigned long start_pfn, unsigned long end_pfn) 2411da177e4SLinus Torvalds { 242dde5828fSRussell King unsigned long boot_pfn; 24390072059SRussell King unsigned int boot_pages; 24490072059SRussell King pg_data_t *pgdat; 24590072059SRussell King int i; 2461da177e4SLinus Torvalds 24790072059SRussell King /* 248dde5828fSRussell King * Map the memory banks for this node. 24990072059SRussell King */ 25090072059SRussell King for_each_nodebank(i, mi, node) { 251456335e2SRussell King struct membank *bank = &mi->bank[i]; 25290072059SRussell King 253dde5828fSRussell King if (!bank->highmem) 254456335e2SRussell King map_memory_bank(bank); 2551da177e4SLinus Torvalds } 2561da177e4SLinus Torvalds 2571da177e4SLinus Torvalds /* 25890072059SRussell King * Allocate the bootmem bitmap page. 2591da177e4SLinus Torvalds */ 26090072059SRussell King boot_pages = bootmem_bootmap_pages(end_pfn - start_pfn); 26190072059SRussell King boot_pfn = find_bootmap_pfn(node, mi, boot_pages); 2621da177e4SLinus Torvalds 2631da177e4SLinus Torvalds /* 26490072059SRussell King * Initialise the bootmem allocator for this node, handing the 26590072059SRussell King * memory banks over to bootmem. 2661da177e4SLinus Torvalds */ 26790072059SRussell King node_set_online(node); 26890072059SRussell King pgdat = NODE_DATA(node); 26990072059SRussell King init_bootmem_node(pgdat, boot_pfn, start_pfn, end_pfn); 27090072059SRussell King 271d2a38ef9SRussell King for_each_nodebank(i, mi, node) { 272d2a38ef9SRussell King struct membank *bank = &mi->bank[i]; 273dde5828fSRussell King if (!bank->highmem) 274d2a38ef9SRussell King free_bootmem_node(pgdat, bank_phys_start(bank), bank_phys_size(bank)); 275b7a69ac3SRussell King memory_present(node, bank_pfn_start(bank), bank_pfn_end(bank)); 276d2a38ef9SRussell King } 2771da177e4SLinus Torvalds 2781da177e4SLinus Torvalds /* 27990072059SRussell King * Reserve the bootmem bitmap for this node. 2801da177e4SLinus Torvalds */ 28190072059SRussell King reserve_bootmem_node(pgdat, boot_pfn << PAGE_SHIFT, 28272a7fe39SBernhard Walle boot_pages << PAGE_SHIFT, BOOTMEM_DEFAULT); 283b7a69ac3SRussell King } 284b962a286SRussell King 285b7a69ac3SRussell King static void __init bootmem_reserve_initrd(int node) 286b7a69ac3SRussell King { 2871da177e4SLinus Torvalds #ifdef CONFIG_BLK_DEV_INITRD 288b7a69ac3SRussell King pg_data_t *pgdat = NODE_DATA(node); 289b7a69ac3SRussell King int res; 290b7a69ac3SRussell King 291b7a69ac3SRussell King res = reserve_bootmem_node(pgdat, phys_initrd_start, 292b962a286SRussell King phys_initrd_size, BOOTMEM_EXCLUSIVE); 293b962a286SRussell King 294b962a286SRussell King if (res == 0) { 2951da177e4SLinus Torvalds initrd_start = __phys_to_virt(phys_initrd_start); 2961da177e4SLinus Torvalds initrd_end = initrd_start + phys_initrd_size; 297b962a286SRussell King } else { 298b962a286SRussell King printk(KERN_ERR 299b962a286SRussell King "INITRD: 0x%08lx+0x%08lx overlaps in-use " 300b962a286SRussell King "memory region - disabling initrd\n", 301b962a286SRussell King phys_initrd_start, phys_initrd_size); 302b962a286SRussell King } 3031da177e4SLinus Torvalds #endif 304b7a69ac3SRussell King } 305b7a69ac3SRussell King 306b7a69ac3SRussell King static void __init bootmem_free_node(int node, struct meminfo *mi) 307b7a69ac3SRussell King { 308b7a69ac3SRussell King unsigned long zone_size[MAX_NR_ZONES], zhole_size[MAX_NR_ZONES]; 309dde5828fSRussell King unsigned long min, max_low, max_high; 310b7a69ac3SRussell King int i; 311b7a69ac3SRussell King 312dde5828fSRussell King find_node_limits(node, mi, &min, &max_low, &max_high); 3131da177e4SLinus Torvalds 31490072059SRussell King /* 31590072059SRussell King * initialise the zones within this node. 31690072059SRussell King */ 31790072059SRussell King memset(zone_size, 0, sizeof(zone_size)); 31890072059SRussell King 31990072059SRussell King /* 32090072059SRussell King * The size of this node has already been determined. If we need 32190072059SRussell King * to do anything fancy with the allocation of this memory to the 32290072059SRussell King * zones, now is the time to do it. 32390072059SRussell King */ 324dde5828fSRussell King zone_size[0] = max_low - min; 325dde5828fSRussell King #ifdef CONFIG_HIGHMEM 326dde5828fSRussell King zone_size[ZONE_HIGHMEM] = max_high - max_low; 327dde5828fSRussell King #endif 32890072059SRussell King 32990072059SRussell King /* 33090072059SRussell King * For each bank in this node, calculate the size of the holes. 33190072059SRussell King * holes = node_size - sum(bank_sizes_in_node) 33290072059SRussell King */ 333dde5828fSRussell King memcpy(zhole_size, zone_size, sizeof(zhole_size)); 334dde5828fSRussell King for_each_nodebank(i, mi, node) { 335dde5828fSRussell King int idx = 0; 336dde5828fSRussell King #ifdef CONFIG_HIGHMEM 337dde5828fSRussell King if (mi->bank[i].highmem) 338dde5828fSRussell King idx = ZONE_HIGHMEM; 339dde5828fSRussell King #endif 340dde5828fSRussell King zhole_size[idx] -= bank_pfn_size(&mi->bank[i]); 341dde5828fSRussell King } 34290072059SRussell King 34390072059SRussell King /* 34490072059SRussell King * Adjust the sizes according to any special requirements for 34590072059SRussell King * this machine type. 34690072059SRussell King */ 34790072059SRussell King arch_adjust_zones(node, zone_size, zhole_size); 34890072059SRussell King 349dde5828fSRussell King free_area_init_node(node, zone_size, min, zhole_size); 35090072059SRussell King } 35190072059SRussell King 3524b5f32ceSNicolas Pitre void __init bootmem_init(void) 35390072059SRussell King { 3544b5f32ceSNicolas Pitre struct meminfo *mi = &meminfo; 355dde5828fSRussell King unsigned long min, max_low, max_high; 356eca73214SRussell King int node, initrd_node; 35790072059SRussell King 35890072059SRussell King /* 35990072059SRussell King * Locate which node contains the ramdisk image, if any. 36090072059SRussell King */ 36190072059SRussell King initrd_node = check_initrd(mi); 36290072059SRussell King 363dde5828fSRussell King max_low = max_high = 0; 364dde5828fSRussell King 36590072059SRussell King /* 36690072059SRussell King * Run through each node initialising the bootmem allocator. 36790072059SRussell King */ 36890072059SRussell King for_each_node(node) { 369dde5828fSRussell King unsigned long node_low, node_high; 370dde5828fSRussell King 371dde5828fSRussell King find_node_limits(node, mi, &min, &node_low, &node_high); 372dde5828fSRussell King 373dde5828fSRussell King if (node_low > max_low) 374dde5828fSRussell King max_low = node_low; 375dde5828fSRussell King if (node_high > max_high) 376dde5828fSRussell King max_high = node_high; 377dde5828fSRussell King 378dde5828fSRussell King /* 379dde5828fSRussell King * If there is no memory in this node, ignore it. 380dde5828fSRussell King * (We can't have nodes which have no lowmem) 381dde5828fSRussell King */ 382dde5828fSRussell King if (node_low == 0) 383dde5828fSRussell King continue; 384dde5828fSRussell King 385dde5828fSRussell King bootmem_init_node(node, mi, min, node_low); 38690072059SRussell King 387b7a69ac3SRussell King /* 388b7a69ac3SRussell King * Reserve any special node zero regions. 389b7a69ac3SRussell King */ 390b7a69ac3SRussell King if (node == 0) 391b7a69ac3SRussell King reserve_node_zero(NODE_DATA(node)); 392b7a69ac3SRussell King 393b7a69ac3SRussell King /* 394b7a69ac3SRussell King * If the initrd is in this node, reserve its memory. 395b7a69ac3SRussell King */ 396b7a69ac3SRussell King if (node == initrd_node) 397b7a69ac3SRussell King bootmem_reserve_initrd(node); 39890072059SRussell King } 39990072059SRussell King 400b7a69ac3SRussell King /* 401b7a69ac3SRussell King * sparse_init() needs the bootmem allocator up and running. 402b7a69ac3SRussell King */ 403b7a69ac3SRussell King sparse_init(); 404b7a69ac3SRussell King 405b7a69ac3SRussell King /* 406b7a69ac3SRussell King * Now free memory in each node - free_area_init_node needs 407b7a69ac3SRussell King * the sparse mem_map arrays initialized by sparse_init() 408b7a69ac3SRussell King * for memmap_init_zone(), otherwise all PFNs are invalid. 409b7a69ac3SRussell King */ 410b7a69ac3SRussell King for_each_node(node) 411b7a69ac3SRussell King bootmem_free_node(node, mi); 412b7a69ac3SRussell King 413dde5828fSRussell King high_memory = __va((max_low << PAGE_SHIFT) - 1) + 1; 41490072059SRussell King 41590072059SRussell King /* 41690072059SRussell King * This doesn't seem to be used by the Linux memory manager any 41790072059SRussell King * more, but is used by ll_rw_block. If we can get rid of it, we 41890072059SRussell King * also get rid of some of the stuff above as well. 41990072059SRussell King * 42090072059SRussell King * Note: max_low_pfn and max_pfn reflect the number of _pages_ in 42190072059SRussell King * the system, not the maximum PFN. 42290072059SRussell King */ 423dde5828fSRussell King max_low_pfn = max_low - PHYS_PFN_OFFSET; 424dde5828fSRussell King max_pfn = max_high - PHYS_PFN_OFFSET; 42590072059SRussell King } 42690072059SRussell King 4276db015e4SNicolas Pitre static inline int free_area(unsigned long pfn, unsigned long end, char *s) 4281da177e4SLinus Torvalds { 4296db015e4SNicolas Pitre unsigned int pages = 0, size = (end - pfn) << (PAGE_SHIFT - 10); 4301da177e4SLinus Torvalds 4316db015e4SNicolas Pitre for (; pfn < end; pfn++) { 4326db015e4SNicolas Pitre struct page *page = pfn_to_page(pfn); 4331da177e4SLinus Torvalds ClearPageReserved(page); 4347835e98bSNick Piggin init_page_count(page); 4356db015e4SNicolas Pitre __free_page(page); 4366db015e4SNicolas Pitre pages++; 4371da177e4SLinus Torvalds } 4381da177e4SLinus Torvalds 4391da177e4SLinus Torvalds if (size && s) 4401da177e4SLinus Torvalds printk(KERN_INFO "Freeing %s memory: %dK\n", s, size); 4416db015e4SNicolas Pitre 4426db015e4SNicolas Pitre return pages; 4431da177e4SLinus Torvalds } 4441da177e4SLinus Torvalds 445a013053dSRussell King static inline void 446a013053dSRussell King free_memmap(int node, unsigned long start_pfn, unsigned long end_pfn) 447a013053dSRussell King { 448a013053dSRussell King struct page *start_pg, *end_pg; 449a013053dSRussell King unsigned long pg, pgend; 450a013053dSRussell King 451a013053dSRussell King /* 452a013053dSRussell King * Convert start_pfn/end_pfn to a struct page pointer. 453a013053dSRussell King */ 454a013053dSRussell King start_pg = pfn_to_page(start_pfn); 455a013053dSRussell King end_pg = pfn_to_page(end_pfn); 456a013053dSRussell King 457a013053dSRussell King /* 458a013053dSRussell King * Convert to physical addresses, and 459a013053dSRussell King * round start upwards and end downwards. 460a013053dSRussell King */ 461a013053dSRussell King pg = PAGE_ALIGN(__pa(start_pg)); 462a013053dSRussell King pgend = __pa(end_pg) & PAGE_MASK; 463a013053dSRussell King 464a013053dSRussell King /* 465a013053dSRussell King * If there are free pages between these, 466a013053dSRussell King * free the section of the memmap array. 467a013053dSRussell King */ 468a013053dSRussell King if (pg < pgend) 469a013053dSRussell King free_bootmem_node(NODE_DATA(node), pg, pgend - pg); 470a013053dSRussell King } 471a013053dSRussell King 472a013053dSRussell King /* 473a013053dSRussell King * The mem_map array can get very big. Free the unused area of the memory map. 474a013053dSRussell King */ 475a013053dSRussell King static void __init free_unused_memmap_node(int node, struct meminfo *mi) 476a013053dSRussell King { 477a013053dSRussell King unsigned long bank_start, prev_bank_end = 0; 478a013053dSRussell King unsigned int i; 479a013053dSRussell King 480a013053dSRussell King /* 481a013053dSRussell King * [FIXME] This relies on each bank being in address order. This 482a013053dSRussell King * may not be the case, especially if the user has provided the 483a013053dSRussell King * information on the command line. 484a013053dSRussell King */ 48590072059SRussell King for_each_nodebank(i, mi, node) { 486d2a38ef9SRussell King struct membank *bank = &mi->bank[i]; 487d2a38ef9SRussell King 488d2a38ef9SRussell King bank_start = bank_pfn_start(bank); 489a013053dSRussell King if (bank_start < prev_bank_end) { 490a013053dSRussell King printk(KERN_ERR "MEM: unordered memory banks. " 491a013053dSRussell King "Not freeing memmap.\n"); 492a013053dSRussell King break; 493a013053dSRussell King } 494a013053dSRussell King 495a013053dSRussell King /* 496a013053dSRussell King * If we had a previous bank, and there is a space 497a013053dSRussell King * between the current bank and the previous, free it. 498a013053dSRussell King */ 499a013053dSRussell King if (prev_bank_end && prev_bank_end != bank_start) 500a013053dSRussell King free_memmap(node, prev_bank_end, bank_start); 501a013053dSRussell King 502d2a38ef9SRussell King prev_bank_end = bank_pfn_end(bank); 503a013053dSRussell King } 504a013053dSRussell King } 505a013053dSRussell King 5061da177e4SLinus Torvalds /* 5071da177e4SLinus Torvalds * mem_init() marks the free areas in the mem_map and tells us how much 5081da177e4SLinus Torvalds * memory is free. This is done after various parts of the system have 5091da177e4SLinus Torvalds * claimed their memory after the kernel image. 5101da177e4SLinus Torvalds */ 5111da177e4SLinus Torvalds void __init mem_init(void) 5121da177e4SLinus Torvalds { 5136db015e4SNicolas Pitre unsigned int codesize, datasize, initsize; 5141da177e4SLinus Torvalds int i, node; 5151da177e4SLinus Torvalds 5161da177e4SLinus Torvalds #ifndef CONFIG_DISCONTIGMEM 5173835f6cbSNicolas Pitre max_mapnr = pfn_to_page(max_pfn + PHYS_PFN_OFFSET) - mem_map; 5181da177e4SLinus Torvalds #endif 5191da177e4SLinus Torvalds 5201da177e4SLinus Torvalds /* this will put all unused low memory onto the freelists */ 5211da177e4SLinus Torvalds for_each_online_node(node) { 5221da177e4SLinus Torvalds pg_data_t *pgdat = NODE_DATA(node); 5231da177e4SLinus Torvalds 524a013053dSRussell King free_unused_memmap_node(node, &meminfo); 525a013053dSRussell King 5261da177e4SLinus Torvalds if (pgdat->node_spanned_pages != 0) 5271da177e4SLinus Torvalds totalram_pages += free_all_bootmem_node(pgdat); 5281da177e4SLinus Torvalds } 5291da177e4SLinus Torvalds 5301da177e4SLinus Torvalds #ifdef CONFIG_SA1111 5311da177e4SLinus Torvalds /* now that our DMA memory is actually so designated, we can free it */ 5326db015e4SNicolas Pitre totalram_pages += free_area(PHYS_PFN_OFFSET, 5336db015e4SNicolas Pitre __phys_to_pfn(__pa(swapper_pg_dir)), NULL); 5341da177e4SLinus Torvalds #endif 5351da177e4SLinus Torvalds 5363835f6cbSNicolas Pitre #ifdef CONFIG_HIGHMEM 5373835f6cbSNicolas Pitre /* set highmem page free */ 5383835f6cbSNicolas Pitre for_each_online_node(node) { 5393835f6cbSNicolas Pitre for_each_nodebank (i, &meminfo, node) { 5403835f6cbSNicolas Pitre unsigned long start = bank_pfn_start(&meminfo.bank[i]); 5413835f6cbSNicolas Pitre unsigned long end = bank_pfn_end(&meminfo.bank[i]); 5423835f6cbSNicolas Pitre if (start >= max_low_pfn + PHYS_PFN_OFFSET) 5433835f6cbSNicolas Pitre totalhigh_pages += free_area(start, end, NULL); 5443835f6cbSNicolas Pitre } 5453835f6cbSNicolas Pitre } 5463835f6cbSNicolas Pitre totalram_pages += totalhigh_pages; 5473835f6cbSNicolas Pitre #endif 5483835f6cbSNicolas Pitre 5491da177e4SLinus Torvalds /* 5501da177e4SLinus Torvalds * Since our memory may not be contiguous, calculate the 5511da177e4SLinus Torvalds * real number of pages we have in this system 5521da177e4SLinus Torvalds */ 5531da177e4SLinus Torvalds printk(KERN_INFO "Memory:"); 5541da177e4SLinus Torvalds num_physpages = 0; 5551da177e4SLinus Torvalds for (i = 0; i < meminfo.nr_banks; i++) { 556d2a38ef9SRussell King num_physpages += bank_pfn_size(&meminfo.bank[i]); 557d2a38ef9SRussell King printk(" %ldMB", bank_phys_size(&meminfo.bank[i]) >> 20); 5581da177e4SLinus Torvalds } 5591da177e4SLinus Torvalds printk(" = %luMB total\n", num_physpages >> (20 - PAGE_SHIFT)); 5606db015e4SNicolas Pitre 56137efe642SRussell King codesize = _etext - _text; 56237efe642SRussell King datasize = _end - _data; 56337efe642SRussell King initsize = __init_end - __init_begin; 5646db015e4SNicolas Pitre 5651da177e4SLinus Torvalds printk(KERN_NOTICE "Memory: %luKB available (%dK code, " 5663835f6cbSNicolas Pitre "%dK data, %dK init, %luK highmem)\n", 5671da177e4SLinus Torvalds (unsigned long) nr_free_pages() << (PAGE_SHIFT-10), 5683835f6cbSNicolas Pitre codesize >> 10, datasize >> 10, initsize >> 10, 5693835f6cbSNicolas Pitre (unsigned long) (totalhigh_pages << (PAGE_SHIFT-10))); 5701da177e4SLinus Torvalds 5711da177e4SLinus Torvalds if (PAGE_SIZE >= 16384 && num_physpages <= 128) { 5721da177e4SLinus Torvalds extern int sysctl_overcommit_memory; 5731da177e4SLinus Torvalds /* 5741da177e4SLinus Torvalds * On a machine this small we won't get 5751da177e4SLinus Torvalds * anywhere without overcommit, so turn 5761da177e4SLinus Torvalds * it on by default. 5771da177e4SLinus Torvalds */ 5781da177e4SLinus Torvalds sysctl_overcommit_memory = OVERCOMMIT_ALWAYS; 5791da177e4SLinus Torvalds } 5801da177e4SLinus Torvalds } 5811da177e4SLinus Torvalds 5821da177e4SLinus Torvalds void free_initmem(void) 5831da177e4SLinus Torvalds { 5846db015e4SNicolas Pitre if (!machine_is_integrator() && !machine_is_cintegrator()) 58537efe642SRussell King totalram_pages += free_area(__phys_to_pfn(__pa(__init_begin)), 58637efe642SRussell King __phys_to_pfn(__pa(__init_end)), 5871da177e4SLinus Torvalds "init"); 5881da177e4SLinus Torvalds } 5891da177e4SLinus Torvalds 5901da177e4SLinus Torvalds #ifdef CONFIG_BLK_DEV_INITRD 5911da177e4SLinus Torvalds 5921da177e4SLinus Torvalds static int keep_initrd; 5931da177e4SLinus Torvalds 5941da177e4SLinus Torvalds void free_initrd_mem(unsigned long start, unsigned long end) 5951da177e4SLinus Torvalds { 5961da177e4SLinus Torvalds if (!keep_initrd) 5976db015e4SNicolas Pitre totalram_pages += free_area(__phys_to_pfn(__pa(start)), 5986db015e4SNicolas Pitre __phys_to_pfn(__pa(end)), 5996db015e4SNicolas Pitre "initrd"); 6001da177e4SLinus Torvalds } 6011da177e4SLinus Torvalds 6021da177e4SLinus Torvalds static int __init keepinitrd_setup(char *__unused) 6031da177e4SLinus Torvalds { 6041da177e4SLinus Torvalds keep_initrd = 1; 6051da177e4SLinus Torvalds return 1; 6061da177e4SLinus Torvalds } 6071da177e4SLinus Torvalds 6081da177e4SLinus Torvalds __setup("keepinitrd", keepinitrd_setup); 6091da177e4SLinus Torvalds #endif 610