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> 201da177e4SLinus Torvalds #include <asm/setup.h> 2174d02fb9SRussell King #include <asm/sizes.h> 221da177e4SLinus Torvalds #include <asm/tlb.h> 231da177e4SLinus Torvalds 241da177e4SLinus Torvalds #include <asm/mach/arch.h> 251da177e4SLinus Torvalds #include <asm/mach/map.h> 261da177e4SLinus Torvalds 271b2e2b73SRussell King #include "mm.h" 281b2e2b73SRussell King 29d111e8f9SRussell King extern void _text, _etext, __data_start, _end, __init_begin, __init_end; 30012d1f4aSRussell 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 /* 695e709827SRay Lehtiniemi * This is used to pass memory configuration data from paging_init 705e709827SRay Lehtiniemi * to mem_init, and by show_mem() to skip holes in the memory map. 711da177e4SLinus Torvalds */ 725e709827SRay Lehtiniemi static struct meminfo meminfo = { 0, }; 735e709827SRay Lehtiniemi 745e709827SRay Lehtiniemi #define for_each_nodebank(iter,mi,no) \ 755e709827SRay Lehtiniemi for (iter = 0; iter < mi->nr_banks; iter++) \ 765e709827SRay Lehtiniemi if (mi->bank[iter].node == no) 771da177e4SLinus Torvalds 781da177e4SLinus Torvalds void show_mem(void) 791da177e4SLinus Torvalds { 801da177e4SLinus Torvalds int free = 0, total = 0, reserved = 0; 815e709827SRay Lehtiniemi int shared = 0, cached = 0, slab = 0, node, i; 825e709827SRay Lehtiniemi struct meminfo * mi = &meminfo; 831da177e4SLinus Torvalds 841da177e4SLinus Torvalds printk("Mem-info:\n"); 851da177e4SLinus Torvalds show_free_areas(); 861da177e4SLinus Torvalds for_each_online_node(node) { 87204ecae4SRussell King pg_data_t *n = NODE_DATA(node); 88204ecae4SRussell King struct page *map = n->node_mem_map - n->node_start_pfn; 89204ecae4SRussell King 905e709827SRay Lehtiniemi for_each_nodebank (i,mi,node) { 915e709827SRay Lehtiniemi unsigned int pfn1, pfn2; 921da177e4SLinus Torvalds struct page *page, *end; 931da177e4SLinus Torvalds 94204ecae4SRussell King pfn1 = __phys_to_pfn(mi->bank[i].start); 95204ecae4SRussell King pfn2 = __phys_to_pfn(mi->bank[i].size + mi->bank[i].start); 965e709827SRay Lehtiniemi 97204ecae4SRussell King page = map + pfn1; 98204ecae4SRussell King end = map + pfn2; 991da177e4SLinus Torvalds 1001da177e4SLinus Torvalds do { 1011da177e4SLinus Torvalds total++; 1021da177e4SLinus Torvalds if (PageReserved(page)) 1031da177e4SLinus Torvalds reserved++; 1041da177e4SLinus Torvalds else if (PageSwapCache(page)) 1051da177e4SLinus Torvalds cached++; 1061da177e4SLinus Torvalds else if (PageSlab(page)) 1071da177e4SLinus Torvalds slab++; 1081da177e4SLinus Torvalds else if (!page_count(page)) 1091da177e4SLinus Torvalds free++; 1101da177e4SLinus Torvalds else 1111da177e4SLinus Torvalds shared += page_count(page) - 1; 1121da177e4SLinus Torvalds page++; 1131da177e4SLinus Torvalds } while (page < end); 1141da177e4SLinus Torvalds } 1155e709827SRay Lehtiniemi } 1161da177e4SLinus Torvalds 1171da177e4SLinus Torvalds printk("%d pages of RAM\n", total); 1181da177e4SLinus Torvalds printk("%d free pages\n", free); 1191da177e4SLinus Torvalds printk("%d reserved pages\n", reserved); 1201da177e4SLinus Torvalds printk("%d slab pages\n", slab); 1211da177e4SLinus Torvalds printk("%d pages shared\n", shared); 1221da177e4SLinus Torvalds printk("%d pages swap cached\n", cached); 1231da177e4SLinus Torvalds } 1241da177e4SLinus Torvalds 1251da177e4SLinus Torvalds /* 1261da177e4SLinus Torvalds * FIXME: We really want to avoid allocating the bootmap bitmap 1271da177e4SLinus Torvalds * over the top of the initrd. Hopefully, this is located towards 1281da177e4SLinus Torvalds * the start of a bank, so if we allocate the bootmap bitmap at 1291da177e4SLinus Torvalds * the end, we won't clash. 1301da177e4SLinus Torvalds */ 1311da177e4SLinus Torvalds static unsigned int __init 1321da177e4SLinus Torvalds find_bootmap_pfn(int node, struct meminfo *mi, unsigned int bootmap_pages) 1331da177e4SLinus Torvalds { 1341da177e4SLinus Torvalds unsigned int start_pfn, bank, bootmap_pfn; 1351da177e4SLinus Torvalds 13690072059SRussell King start_pfn = PAGE_ALIGN(__pa(&_end)) >> PAGE_SHIFT; 1371da177e4SLinus Torvalds bootmap_pfn = 0; 1381da177e4SLinus Torvalds 13990072059SRussell King for_each_nodebank(bank, mi, node) { 1401da177e4SLinus Torvalds unsigned int start, end; 1411da177e4SLinus Torvalds 14292a8cbedSRussell King start = mi->bank[bank].start >> PAGE_SHIFT; 14392a8cbedSRussell King end = (mi->bank[bank].size + 14492a8cbedSRussell King mi->bank[bank].start) >> PAGE_SHIFT; 1451da177e4SLinus Torvalds 1461da177e4SLinus Torvalds if (end < start_pfn) 1471da177e4SLinus Torvalds continue; 1481da177e4SLinus Torvalds 1491da177e4SLinus Torvalds if (start < start_pfn) 1501da177e4SLinus Torvalds start = start_pfn; 1511da177e4SLinus Torvalds 1521da177e4SLinus Torvalds if (end <= start) 1531da177e4SLinus Torvalds continue; 1541da177e4SLinus Torvalds 1551da177e4SLinus Torvalds if (end - start >= bootmap_pages) { 1561da177e4SLinus Torvalds bootmap_pfn = start; 1571da177e4SLinus Torvalds break; 1581da177e4SLinus Torvalds } 1591da177e4SLinus Torvalds } 1601da177e4SLinus Torvalds 1611da177e4SLinus Torvalds if (bootmap_pfn == 0) 1621da177e4SLinus Torvalds BUG(); 1631da177e4SLinus Torvalds 1641da177e4SLinus Torvalds return bootmap_pfn; 1651da177e4SLinus Torvalds } 1661da177e4SLinus Torvalds 1671da177e4SLinus Torvalds static int __init check_initrd(struct meminfo *mi) 1681da177e4SLinus Torvalds { 1691da177e4SLinus Torvalds int initrd_node = -2; 1701da177e4SLinus Torvalds #ifdef CONFIG_BLK_DEV_INITRD 1711da177e4SLinus Torvalds unsigned long end = phys_initrd_start + phys_initrd_size; 1721da177e4SLinus Torvalds 1731da177e4SLinus Torvalds /* 1741da177e4SLinus Torvalds * Make sure that the initrd is within a valid area of 1751da177e4SLinus Torvalds * memory. 1761da177e4SLinus Torvalds */ 1771da177e4SLinus Torvalds if (phys_initrd_size) { 1781da177e4SLinus Torvalds unsigned int i; 1791da177e4SLinus Torvalds 1801da177e4SLinus Torvalds initrd_node = -1; 1811da177e4SLinus Torvalds 1821da177e4SLinus Torvalds for (i = 0; i < mi->nr_banks; i++) { 1831da177e4SLinus Torvalds unsigned long bank_end; 1841da177e4SLinus Torvalds 1851da177e4SLinus Torvalds bank_end = mi->bank[i].start + mi->bank[i].size; 1861da177e4SLinus Torvalds 1871da177e4SLinus Torvalds if (mi->bank[i].start <= phys_initrd_start && 1881da177e4SLinus Torvalds end <= bank_end) 1891da177e4SLinus Torvalds initrd_node = mi->bank[i].node; 1901da177e4SLinus Torvalds } 1911da177e4SLinus Torvalds } 1921da177e4SLinus Torvalds 1931da177e4SLinus Torvalds if (initrd_node == -1) { 194b962a286SRussell King printk(KERN_ERR "INITRD: 0x%08lx+0x%08lx extends beyond " 1951da177e4SLinus Torvalds "physical memory - disabling initrd\n", 196b962a286SRussell King phys_initrd_start, phys_initrd_size); 1971da177e4SLinus Torvalds phys_initrd_start = phys_initrd_size = 0; 1981da177e4SLinus Torvalds } 1991da177e4SLinus Torvalds #endif 2001da177e4SLinus Torvalds 2011da177e4SLinus Torvalds return initrd_node; 2021da177e4SLinus Torvalds } 2031da177e4SLinus Torvalds 204456335e2SRussell King static inline void map_memory_bank(struct membank *bank) 205456335e2SRussell King { 206d111e8f9SRussell King #ifdef CONFIG_MMU 207456335e2SRussell King struct map_desc map; 208456335e2SRussell King 209456335e2SRussell King map.pfn = __phys_to_pfn(bank->start); 210456335e2SRussell King map.virtual = __phys_to_virt(bank->start); 211456335e2SRussell King map.length = bank->size; 212456335e2SRussell King map.type = MT_MEMORY; 213456335e2SRussell King 214456335e2SRussell King create_mapping(&map); 215d111e8f9SRussell King #endif 216456335e2SRussell King } 217456335e2SRussell King 21890072059SRussell King static unsigned long __init 21990072059SRussell King bootmem_init_node(int node, int initrd_node, struct meminfo *mi) 2201da177e4SLinus Torvalds { 22190072059SRussell King unsigned long zone_size[MAX_NR_ZONES], zhole_size[MAX_NR_ZONES]; 22290072059SRussell King unsigned long start_pfn, end_pfn, boot_pfn; 22390072059SRussell King unsigned int boot_pages; 22490072059SRussell King pg_data_t *pgdat; 22590072059SRussell King int i; 2261da177e4SLinus Torvalds 22790072059SRussell King start_pfn = -1UL; 22890072059SRussell King end_pfn = 0; 22990072059SRussell King 23090072059SRussell King /* 23190072059SRussell King * Calculate the pfn range, and map the memory banks for this node. 23290072059SRussell King */ 23390072059SRussell King for_each_nodebank(i, mi, node) { 234456335e2SRussell King struct membank *bank = &mi->bank[i]; 23590072059SRussell King unsigned long start, end; 23690072059SRussell King 237456335e2SRussell King start = bank->start >> PAGE_SHIFT; 238456335e2SRussell King end = (bank->start + bank->size) >> PAGE_SHIFT; 23990072059SRussell King 24090072059SRussell King if (start_pfn > start) 24190072059SRussell King start_pfn = start; 24290072059SRussell King if (end_pfn < end) 24390072059SRussell King end_pfn = end; 24490072059SRussell King 245456335e2SRussell King map_memory_bank(bank); 2461da177e4SLinus Torvalds } 2471da177e4SLinus Torvalds 2481da177e4SLinus Torvalds /* 24990072059SRussell King * If there is no memory in this node, ignore it. 2501da177e4SLinus Torvalds */ 25190072059SRussell King if (end_pfn == 0) 25290072059SRussell King return end_pfn; 2531da177e4SLinus Torvalds 2541da177e4SLinus Torvalds /* 25590072059SRussell King * Allocate the bootmem bitmap page. 2561da177e4SLinus Torvalds */ 25790072059SRussell King boot_pages = bootmem_bootmap_pages(end_pfn - start_pfn); 25890072059SRussell King boot_pfn = find_bootmap_pfn(node, mi, boot_pages); 2591da177e4SLinus Torvalds 2601da177e4SLinus Torvalds /* 26190072059SRussell King * Initialise the bootmem allocator for this node, handing the 26290072059SRussell King * memory banks over to bootmem. 2631da177e4SLinus Torvalds */ 26490072059SRussell King node_set_online(node); 26590072059SRussell King pgdat = NODE_DATA(node); 26690072059SRussell King init_bootmem_node(pgdat, boot_pfn, start_pfn, end_pfn); 26790072059SRussell King 26890072059SRussell King for_each_nodebank(i, mi, node) 26990072059SRussell King free_bootmem_node(pgdat, mi->bank[i].start, mi->bank[i].size); 2701da177e4SLinus Torvalds 2711da177e4SLinus Torvalds /* 27290072059SRussell King * Reserve the bootmem bitmap for this node. 2731da177e4SLinus Torvalds */ 27490072059SRussell King reserve_bootmem_node(pgdat, boot_pfn << PAGE_SHIFT, 27572a7fe39SBernhard Walle boot_pages << PAGE_SHIFT, BOOTMEM_DEFAULT); 2761da177e4SLinus Torvalds 277b962a286SRussell King /* 278b962a286SRussell King * Reserve any special node zero regions. 279b962a286SRussell King */ 280b962a286SRussell King if (node == 0) 281b962a286SRussell King reserve_node_zero(pgdat); 282b962a286SRussell King 2831da177e4SLinus Torvalds #ifdef CONFIG_BLK_DEV_INITRD 28490072059SRussell King /* 28590072059SRussell King * If the initrd is in this node, reserve its memory. 28690072059SRussell King */ 28790072059SRussell King if (node == initrd_node) { 288b962a286SRussell King int res = reserve_bootmem_node(pgdat, phys_initrd_start, 289b962a286SRussell King phys_initrd_size, BOOTMEM_EXCLUSIVE); 290b962a286SRussell King 291b962a286SRussell King if (res == 0) { 2921da177e4SLinus Torvalds initrd_start = __phys_to_virt(phys_initrd_start); 2931da177e4SLinus Torvalds initrd_end = initrd_start + phys_initrd_size; 294b962a286SRussell King } else { 295b962a286SRussell King printk(KERN_ERR 296b962a286SRussell King "INITRD: 0x%08lx+0x%08lx overlaps in-use " 297b962a286SRussell King "memory region - disabling initrd\n", 298b962a286SRussell King phys_initrd_start, phys_initrd_size); 299b962a286SRussell King } 3001da177e4SLinus Torvalds } 3011da177e4SLinus Torvalds #endif 3021da177e4SLinus Torvalds 30390072059SRussell King /* 30490072059SRussell King * initialise the zones within this node. 30590072059SRussell King */ 30690072059SRussell King memset(zone_size, 0, sizeof(zone_size)); 30790072059SRussell King memset(zhole_size, 0, sizeof(zhole_size)); 30890072059SRussell King 30990072059SRussell King /* 31090072059SRussell King * The size of this node has already been determined. If we need 31190072059SRussell King * to do anything fancy with the allocation of this memory to the 31290072059SRussell King * zones, now is the time to do it. 31390072059SRussell King */ 31490072059SRussell King zone_size[0] = end_pfn - start_pfn; 31590072059SRussell King 31690072059SRussell King /* 31790072059SRussell King * For each bank in this node, calculate the size of the holes. 31890072059SRussell King * holes = node_size - sum(bank_sizes_in_node) 31990072059SRussell King */ 32090072059SRussell King zhole_size[0] = zone_size[0]; 32190072059SRussell King for_each_nodebank(i, mi, node) 32290072059SRussell King zhole_size[0] -= mi->bank[i].size >> PAGE_SHIFT; 32390072059SRussell King 32490072059SRussell King /* 32590072059SRussell King * Adjust the sizes according to any special requirements for 32690072059SRussell King * this machine type. 32790072059SRussell King */ 32890072059SRussell King arch_adjust_zones(node, zone_size, zhole_size); 32990072059SRussell King 3309109fb7bSJohannes Weiner free_area_init_node(node, zone_size, start_pfn, zhole_size); 33190072059SRussell King 33290072059SRussell King return end_pfn; 33390072059SRussell King } 33490072059SRussell King 335d111e8f9SRussell King void __init bootmem_init(struct meminfo *mi) 33690072059SRussell King { 337456335e2SRussell King unsigned long memend_pfn = 0; 33890072059SRussell King int node, initrd_node, i; 33990072059SRussell King 34090072059SRussell King /* 34190072059SRussell King * Invalidate the node number for empty or invalid memory banks 34290072059SRussell King */ 34390072059SRussell King for (i = 0; i < mi->nr_banks; i++) 34490072059SRussell King if (mi->bank[i].size == 0 || mi->bank[i].node >= MAX_NUMNODES) 34590072059SRussell King mi->bank[i].node = -1; 34690072059SRussell King 34790072059SRussell King memcpy(&meminfo, mi, sizeof(meminfo)); 34890072059SRussell King 34990072059SRussell King /* 35090072059SRussell King * Locate which node contains the ramdisk image, if any. 35190072059SRussell King */ 35290072059SRussell King initrd_node = check_initrd(mi); 35390072059SRussell King 35490072059SRussell King /* 35590072059SRussell King * Run through each node initialising the bootmem allocator. 35690072059SRussell King */ 35790072059SRussell King for_each_node(node) { 35890072059SRussell King unsigned long end_pfn; 35990072059SRussell King 36090072059SRussell King end_pfn = bootmem_init_node(node, initrd_node, mi); 36190072059SRussell King 36290072059SRussell King /* 36390072059SRussell King * Remember the highest memory PFN. 36490072059SRussell King */ 36590072059SRussell King if (end_pfn > memend_pfn) 36690072059SRussell King memend_pfn = end_pfn; 36790072059SRussell King } 36890072059SRussell King 36990072059SRussell King high_memory = __va(memend_pfn << PAGE_SHIFT); 37090072059SRussell King 37190072059SRussell King /* 37290072059SRussell King * This doesn't seem to be used by the Linux memory manager any 37390072059SRussell King * more, but is used by ll_rw_block. If we can get rid of it, we 37490072059SRussell King * also get rid of some of the stuff above as well. 37590072059SRussell King * 37690072059SRussell King * Note: max_low_pfn and max_pfn reflect the number of _pages_ in 37790072059SRussell King * the system, not the maximum PFN. 37890072059SRussell King */ 37990072059SRussell King max_pfn = max_low_pfn = memend_pfn - PHYS_PFN_OFFSET; 38090072059SRussell King } 38190072059SRussell King 3821da177e4SLinus Torvalds static inline void free_area(unsigned long addr, unsigned long end, char *s) 3831da177e4SLinus Torvalds { 3841da177e4SLinus Torvalds unsigned int size = (end - addr) >> 10; 3851da177e4SLinus Torvalds 3861da177e4SLinus Torvalds for (; addr < end; addr += PAGE_SIZE) { 3871da177e4SLinus Torvalds struct page *page = virt_to_page(addr); 3881da177e4SLinus Torvalds ClearPageReserved(page); 3897835e98bSNick Piggin init_page_count(page); 3901da177e4SLinus Torvalds free_page(addr); 3911da177e4SLinus Torvalds totalram_pages++; 3921da177e4SLinus Torvalds } 3931da177e4SLinus Torvalds 3941da177e4SLinus Torvalds if (size && s) 3951da177e4SLinus Torvalds printk(KERN_INFO "Freeing %s memory: %dK\n", s, size); 3961da177e4SLinus Torvalds } 3971da177e4SLinus Torvalds 398a013053dSRussell King static inline void 399a013053dSRussell King free_memmap(int node, unsigned long start_pfn, unsigned long end_pfn) 400a013053dSRussell King { 401a013053dSRussell King struct page *start_pg, *end_pg; 402a013053dSRussell King unsigned long pg, pgend; 403a013053dSRussell King 404a013053dSRussell King /* 405a013053dSRussell King * Convert start_pfn/end_pfn to a struct page pointer. 406a013053dSRussell King */ 407a013053dSRussell King start_pg = pfn_to_page(start_pfn); 408a013053dSRussell King end_pg = pfn_to_page(end_pfn); 409a013053dSRussell King 410a013053dSRussell King /* 411a013053dSRussell King * Convert to physical addresses, and 412a013053dSRussell King * round start upwards and end downwards. 413a013053dSRussell King */ 414a013053dSRussell King pg = PAGE_ALIGN(__pa(start_pg)); 415a013053dSRussell King pgend = __pa(end_pg) & PAGE_MASK; 416a013053dSRussell King 417a013053dSRussell King /* 418a013053dSRussell King * If there are free pages between these, 419a013053dSRussell King * free the section of the memmap array. 420a013053dSRussell King */ 421a013053dSRussell King if (pg < pgend) 422a013053dSRussell King free_bootmem_node(NODE_DATA(node), pg, pgend - pg); 423a013053dSRussell King } 424a013053dSRussell King 425a013053dSRussell King /* 426a013053dSRussell King * The mem_map array can get very big. Free the unused area of the memory map. 427a013053dSRussell King */ 428a013053dSRussell King static void __init free_unused_memmap_node(int node, struct meminfo *mi) 429a013053dSRussell King { 430a013053dSRussell King unsigned long bank_start, prev_bank_end = 0; 431a013053dSRussell King unsigned int i; 432a013053dSRussell King 433a013053dSRussell King /* 434a013053dSRussell King * [FIXME] This relies on each bank being in address order. This 435a013053dSRussell King * may not be the case, especially if the user has provided the 436a013053dSRussell King * information on the command line. 437a013053dSRussell King */ 43890072059SRussell King for_each_nodebank(i, mi, node) { 439a013053dSRussell King bank_start = mi->bank[i].start >> PAGE_SHIFT; 440a013053dSRussell King if (bank_start < prev_bank_end) { 441a013053dSRussell King printk(KERN_ERR "MEM: unordered memory banks. " 442a013053dSRussell King "Not freeing memmap.\n"); 443a013053dSRussell King break; 444a013053dSRussell King } 445a013053dSRussell King 446a013053dSRussell King /* 447a013053dSRussell King * If we had a previous bank, and there is a space 448a013053dSRussell King * between the current bank and the previous, free it. 449a013053dSRussell King */ 450a013053dSRussell King if (prev_bank_end && prev_bank_end != bank_start) 451a013053dSRussell King free_memmap(node, prev_bank_end, bank_start); 452a013053dSRussell King 453a013053dSRussell King prev_bank_end = (mi->bank[i].start + 454a013053dSRussell King mi->bank[i].size) >> PAGE_SHIFT; 455a013053dSRussell King } 456a013053dSRussell King } 457a013053dSRussell King 4581da177e4SLinus Torvalds /* 4591da177e4SLinus Torvalds * mem_init() marks the free areas in the mem_map and tells us how much 4601da177e4SLinus Torvalds * memory is free. This is done after various parts of the system have 4611da177e4SLinus Torvalds * claimed their memory after the kernel image. 4621da177e4SLinus Torvalds */ 4631da177e4SLinus Torvalds void __init mem_init(void) 4641da177e4SLinus Torvalds { 4651da177e4SLinus Torvalds unsigned int codepages, datapages, initpages; 4661da177e4SLinus Torvalds int i, node; 4671da177e4SLinus Torvalds 4681da177e4SLinus Torvalds codepages = &_etext - &_text; 4691da177e4SLinus Torvalds datapages = &_end - &__data_start; 4701da177e4SLinus Torvalds initpages = &__init_end - &__init_begin; 4711da177e4SLinus Torvalds 4721da177e4SLinus Torvalds #ifndef CONFIG_DISCONTIGMEM 4731da177e4SLinus Torvalds max_mapnr = virt_to_page(high_memory) - mem_map; 4741da177e4SLinus Torvalds #endif 4751da177e4SLinus Torvalds 4761da177e4SLinus Torvalds /* this will put all unused low memory onto the freelists */ 4771da177e4SLinus Torvalds for_each_online_node(node) { 4781da177e4SLinus Torvalds pg_data_t *pgdat = NODE_DATA(node); 4791da177e4SLinus Torvalds 480a013053dSRussell King free_unused_memmap_node(node, &meminfo); 481a013053dSRussell King 4821da177e4SLinus Torvalds if (pgdat->node_spanned_pages != 0) 4831da177e4SLinus Torvalds totalram_pages += free_all_bootmem_node(pgdat); 4841da177e4SLinus Torvalds } 4851da177e4SLinus Torvalds 4861da177e4SLinus Torvalds #ifdef CONFIG_SA1111 4871da177e4SLinus Torvalds /* now that our DMA memory is actually so designated, we can free it */ 4881da177e4SLinus Torvalds free_area(PAGE_OFFSET, (unsigned long)swapper_pg_dir, NULL); 4891da177e4SLinus Torvalds #endif 4901da177e4SLinus Torvalds 4911da177e4SLinus Torvalds /* 4921da177e4SLinus Torvalds * Since our memory may not be contiguous, calculate the 4931da177e4SLinus Torvalds * real number of pages we have in this system 4941da177e4SLinus Torvalds */ 4951da177e4SLinus Torvalds printk(KERN_INFO "Memory:"); 4961da177e4SLinus Torvalds 4971da177e4SLinus Torvalds num_physpages = 0; 4981da177e4SLinus Torvalds for (i = 0; i < meminfo.nr_banks; i++) { 4991da177e4SLinus Torvalds num_physpages += meminfo.bank[i].size >> PAGE_SHIFT; 5001da177e4SLinus Torvalds printk(" %ldMB", meminfo.bank[i].size >> 20); 5011da177e4SLinus Torvalds } 5021da177e4SLinus Torvalds 5031da177e4SLinus Torvalds printk(" = %luMB total\n", num_physpages >> (20 - PAGE_SHIFT)); 5041da177e4SLinus Torvalds printk(KERN_NOTICE "Memory: %luKB available (%dK code, " 5051da177e4SLinus Torvalds "%dK data, %dK init)\n", 5061da177e4SLinus Torvalds (unsigned long) nr_free_pages() << (PAGE_SHIFT-10), 5071da177e4SLinus Torvalds codepages >> 10, datapages >> 10, initpages >> 10); 5081da177e4SLinus Torvalds 5091da177e4SLinus Torvalds if (PAGE_SIZE >= 16384 && num_physpages <= 128) { 5101da177e4SLinus Torvalds extern int sysctl_overcommit_memory; 5111da177e4SLinus Torvalds /* 5121da177e4SLinus Torvalds * On a machine this small we won't get 5131da177e4SLinus Torvalds * anywhere without overcommit, so turn 5141da177e4SLinus Torvalds * it on by default. 5151da177e4SLinus Torvalds */ 5161da177e4SLinus Torvalds sysctl_overcommit_memory = OVERCOMMIT_ALWAYS; 5171da177e4SLinus Torvalds } 5181da177e4SLinus Torvalds } 5191da177e4SLinus Torvalds 5201da177e4SLinus Torvalds void free_initmem(void) 5211da177e4SLinus Torvalds { 5221da177e4SLinus Torvalds if (!machine_is_integrator() && !machine_is_cintegrator()) { 5231da177e4SLinus Torvalds free_area((unsigned long)(&__init_begin), 5241da177e4SLinus Torvalds (unsigned long)(&__init_end), 5251da177e4SLinus Torvalds "init"); 5261da177e4SLinus Torvalds } 5271da177e4SLinus Torvalds } 5281da177e4SLinus Torvalds 5291da177e4SLinus Torvalds #ifdef CONFIG_BLK_DEV_INITRD 5301da177e4SLinus Torvalds 5311da177e4SLinus Torvalds static int keep_initrd; 5321da177e4SLinus Torvalds 5331da177e4SLinus Torvalds void free_initrd_mem(unsigned long start, unsigned long end) 5341da177e4SLinus Torvalds { 5351da177e4SLinus Torvalds if (!keep_initrd) 5361da177e4SLinus Torvalds free_area(start, end, "initrd"); 5371da177e4SLinus Torvalds } 5381da177e4SLinus Torvalds 5391da177e4SLinus Torvalds static int __init keepinitrd_setup(char *__unused) 5401da177e4SLinus Torvalds { 5411da177e4SLinus Torvalds keep_initrd = 1; 5421da177e4SLinus Torvalds return 1; 5431da177e4SLinus Torvalds } 5441da177e4SLinus Torvalds 5451da177e4SLinus Torvalds __setup("keepinitrd", keepinitrd_setup); 5461da177e4SLinus Torvalds #endif 547