11da177e4SLinus Torvalds /* 21da177e4SLinus Torvalds * linux/arch/arm/mm/init.c 31da177e4SLinus Torvalds * 41da177e4SLinus Torvalds * Copyright (C) 1995-2002 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/config.h> 111da177e4SLinus Torvalds #include <linux/kernel.h> 121da177e4SLinus Torvalds #include <linux/errno.h> 131da177e4SLinus Torvalds #include <linux/ptrace.h> 141da177e4SLinus Torvalds #include <linux/swap.h> 151da177e4SLinus Torvalds #include <linux/init.h> 161da177e4SLinus Torvalds #include <linux/bootmem.h> 171da177e4SLinus Torvalds #include <linux/mman.h> 181da177e4SLinus Torvalds #include <linux/nodemask.h> 191da177e4SLinus Torvalds #include <linux/initrd.h> 201da177e4SLinus Torvalds 211da177e4SLinus Torvalds #include <asm/mach-types.h> 221da177e4SLinus Torvalds #include <asm/hardware.h> 231da177e4SLinus Torvalds #include <asm/setup.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 291da177e4SLinus Torvalds #define TABLE_SIZE (2 * PTRS_PER_PTE * sizeof(pte_t)) 301da177e4SLinus Torvalds 311da177e4SLinus Torvalds DEFINE_PER_CPU(struct mmu_gather, mmu_gathers); 321da177e4SLinus Torvalds 331da177e4SLinus Torvalds extern pgd_t swapper_pg_dir[PTRS_PER_PGD]; 341da177e4SLinus Torvalds extern void _stext, _text, _etext, __data_start, _end, __init_begin, __init_end; 351da177e4SLinus Torvalds extern unsigned long phys_initrd_start; 361da177e4SLinus Torvalds extern unsigned long phys_initrd_size; 371da177e4SLinus Torvalds 381da177e4SLinus Torvalds /* 391da177e4SLinus Torvalds * The sole use of this is to pass memory configuration 401da177e4SLinus Torvalds * data from paging_init to mem_init. 411da177e4SLinus Torvalds */ 421da177e4SLinus Torvalds static struct meminfo meminfo __initdata = { 0, }; 431da177e4SLinus Torvalds 441da177e4SLinus Torvalds /* 451da177e4SLinus Torvalds * empty_zero_page is a special page that is used for 461da177e4SLinus Torvalds * zero-initialized data and COW. 471da177e4SLinus Torvalds */ 481da177e4SLinus Torvalds struct page *empty_zero_page; 491da177e4SLinus Torvalds 501da177e4SLinus Torvalds void show_mem(void) 511da177e4SLinus Torvalds { 521da177e4SLinus Torvalds int free = 0, total = 0, reserved = 0; 531da177e4SLinus Torvalds int shared = 0, cached = 0, slab = 0, node; 541da177e4SLinus Torvalds 551da177e4SLinus Torvalds printk("Mem-info:\n"); 561da177e4SLinus Torvalds show_free_areas(); 571da177e4SLinus Torvalds printk("Free swap: %6ldkB\n", nr_swap_pages<<(PAGE_SHIFT-10)); 581da177e4SLinus Torvalds 591da177e4SLinus Torvalds for_each_online_node(node) { 601da177e4SLinus Torvalds struct page *page, *end; 611da177e4SLinus Torvalds 621da177e4SLinus Torvalds page = NODE_MEM_MAP(node); 631da177e4SLinus Torvalds end = page + NODE_DATA(node)->node_spanned_pages; 641da177e4SLinus Torvalds 651da177e4SLinus Torvalds do { 661da177e4SLinus Torvalds total++; 671da177e4SLinus Torvalds if (PageReserved(page)) 681da177e4SLinus Torvalds reserved++; 691da177e4SLinus Torvalds else if (PageSwapCache(page)) 701da177e4SLinus Torvalds cached++; 711da177e4SLinus Torvalds else if (PageSlab(page)) 721da177e4SLinus Torvalds slab++; 731da177e4SLinus Torvalds else if (!page_count(page)) 741da177e4SLinus Torvalds free++; 751da177e4SLinus Torvalds else 761da177e4SLinus Torvalds shared += page_count(page) - 1; 771da177e4SLinus Torvalds page++; 781da177e4SLinus Torvalds } while (page < end); 791da177e4SLinus Torvalds } 801da177e4SLinus Torvalds 811da177e4SLinus Torvalds printk("%d pages of RAM\n", total); 821da177e4SLinus Torvalds printk("%d free pages\n", free); 831da177e4SLinus Torvalds printk("%d reserved pages\n", reserved); 841da177e4SLinus Torvalds printk("%d slab pages\n", slab); 851da177e4SLinus Torvalds printk("%d pages shared\n", shared); 861da177e4SLinus Torvalds printk("%d pages swap cached\n", cached); 871da177e4SLinus Torvalds } 881da177e4SLinus Torvalds 891da177e4SLinus Torvalds struct node_info { 901da177e4SLinus Torvalds unsigned int start; 911da177e4SLinus Torvalds unsigned int end; 921da177e4SLinus Torvalds int bootmap_pages; 931da177e4SLinus Torvalds }; 941da177e4SLinus Torvalds 951da177e4SLinus Torvalds #define O_PFN_DOWN(x) ((x) >> PAGE_SHIFT) 961da177e4SLinus Torvalds #define O_PFN_UP(x) (PAGE_ALIGN(x) >> PAGE_SHIFT) 971da177e4SLinus Torvalds 981da177e4SLinus Torvalds /* 991da177e4SLinus Torvalds * FIXME: We really want to avoid allocating the bootmap bitmap 1001da177e4SLinus Torvalds * over the top of the initrd. Hopefully, this is located towards 1011da177e4SLinus Torvalds * the start of a bank, so if we allocate the bootmap bitmap at 1021da177e4SLinus Torvalds * the end, we won't clash. 1031da177e4SLinus Torvalds */ 1041da177e4SLinus Torvalds static unsigned int __init 1051da177e4SLinus Torvalds find_bootmap_pfn(int node, struct meminfo *mi, unsigned int bootmap_pages) 1061da177e4SLinus Torvalds { 1071da177e4SLinus Torvalds unsigned int start_pfn, bank, bootmap_pfn; 1081da177e4SLinus Torvalds 10992a8cbedSRussell King start_pfn = O_PFN_UP(__pa(&_end)); 1101da177e4SLinus Torvalds bootmap_pfn = 0; 1111da177e4SLinus Torvalds 1121da177e4SLinus Torvalds for (bank = 0; bank < mi->nr_banks; bank ++) { 1131da177e4SLinus Torvalds unsigned int start, end; 1141da177e4SLinus Torvalds 1151da177e4SLinus Torvalds if (mi->bank[bank].node != node) 1161da177e4SLinus Torvalds continue; 1171da177e4SLinus Torvalds 11892a8cbedSRussell King start = mi->bank[bank].start >> PAGE_SHIFT; 11992a8cbedSRussell King end = (mi->bank[bank].size + 12092a8cbedSRussell King mi->bank[bank].start) >> PAGE_SHIFT; 1211da177e4SLinus Torvalds 1221da177e4SLinus Torvalds if (end < start_pfn) 1231da177e4SLinus Torvalds continue; 1241da177e4SLinus Torvalds 1251da177e4SLinus Torvalds if (start < start_pfn) 1261da177e4SLinus Torvalds start = start_pfn; 1271da177e4SLinus Torvalds 1281da177e4SLinus Torvalds if (end <= start) 1291da177e4SLinus Torvalds continue; 1301da177e4SLinus Torvalds 1311da177e4SLinus Torvalds if (end - start >= bootmap_pages) { 1321da177e4SLinus Torvalds bootmap_pfn = start; 1331da177e4SLinus Torvalds break; 1341da177e4SLinus Torvalds } 1351da177e4SLinus Torvalds } 1361da177e4SLinus Torvalds 1371da177e4SLinus Torvalds if (bootmap_pfn == 0) 1381da177e4SLinus Torvalds BUG(); 1391da177e4SLinus Torvalds 1401da177e4SLinus Torvalds return bootmap_pfn; 1411da177e4SLinus Torvalds } 1421da177e4SLinus Torvalds 1431da177e4SLinus Torvalds /* 1441da177e4SLinus Torvalds * Scan the memory info structure and pull out: 1451da177e4SLinus Torvalds * - the end of memory 1461da177e4SLinus Torvalds * - the number of nodes 1471da177e4SLinus Torvalds * - the pfn range of each node 1481da177e4SLinus Torvalds * - the number of bootmem bitmap pages 1491da177e4SLinus Torvalds */ 1501da177e4SLinus Torvalds static unsigned int __init 1511da177e4SLinus Torvalds find_memend_and_nodes(struct meminfo *mi, struct node_info *np) 1521da177e4SLinus Torvalds { 1531da177e4SLinus Torvalds unsigned int i, bootmem_pages = 0, memend_pfn = 0; 1541da177e4SLinus Torvalds 1551da177e4SLinus Torvalds for (i = 0; i < MAX_NUMNODES; i++) { 1561da177e4SLinus Torvalds np[i].start = -1U; 1571da177e4SLinus Torvalds np[i].end = 0; 1581da177e4SLinus Torvalds np[i].bootmap_pages = 0; 1591da177e4SLinus Torvalds } 1601da177e4SLinus Torvalds 1611da177e4SLinus Torvalds for (i = 0; i < mi->nr_banks; i++) { 1621da177e4SLinus Torvalds unsigned long start, end; 1631da177e4SLinus Torvalds int node; 1641da177e4SLinus Torvalds 1651da177e4SLinus Torvalds if (mi->bank[i].size == 0) { 1661da177e4SLinus Torvalds /* 1671da177e4SLinus Torvalds * Mark this bank with an invalid node number 1681da177e4SLinus Torvalds */ 1691da177e4SLinus Torvalds mi->bank[i].node = -1; 1701da177e4SLinus Torvalds continue; 1711da177e4SLinus Torvalds } 1721da177e4SLinus Torvalds 1731da177e4SLinus Torvalds node = mi->bank[i].node; 1741da177e4SLinus Torvalds 1751da177e4SLinus Torvalds /* 1761da177e4SLinus Torvalds * Make sure we haven't exceeded the maximum number of nodes 1771da177e4SLinus Torvalds * that we have in this configuration. If we have, we're in 1781da177e4SLinus Torvalds * trouble. (maybe we ought to limit, instead of bugging?) 1791da177e4SLinus Torvalds */ 1801da177e4SLinus Torvalds if (node >= MAX_NUMNODES) 1811da177e4SLinus Torvalds BUG(); 1821da177e4SLinus Torvalds node_set_online(node); 1831da177e4SLinus Torvalds 1841da177e4SLinus Torvalds /* 1851da177e4SLinus Torvalds * Get the start and end pfns for this bank 1861da177e4SLinus Torvalds */ 18792a8cbedSRussell King start = mi->bank[i].start >> PAGE_SHIFT; 18892a8cbedSRussell King end = (mi->bank[i].start + mi->bank[i].size) >> PAGE_SHIFT; 1891da177e4SLinus Torvalds 1901da177e4SLinus Torvalds if (np[node].start > start) 1911da177e4SLinus Torvalds np[node].start = start; 1921da177e4SLinus Torvalds 1931da177e4SLinus Torvalds if (np[node].end < end) 1941da177e4SLinus Torvalds np[node].end = end; 1951da177e4SLinus Torvalds 1961da177e4SLinus Torvalds if (memend_pfn < end) 1971da177e4SLinus Torvalds memend_pfn = end; 1981da177e4SLinus Torvalds } 1991da177e4SLinus Torvalds 2001da177e4SLinus Torvalds /* 2011da177e4SLinus Torvalds * Calculate the number of pages we require to 2021da177e4SLinus Torvalds * store the bootmem bitmaps. 2031da177e4SLinus Torvalds */ 2041da177e4SLinus Torvalds for_each_online_node(i) { 2051da177e4SLinus Torvalds if (np[i].end == 0) 2061da177e4SLinus Torvalds continue; 2071da177e4SLinus Torvalds 2081da177e4SLinus Torvalds np[i].bootmap_pages = bootmem_bootmap_pages(np[i].end - 2091da177e4SLinus Torvalds np[i].start); 2101da177e4SLinus Torvalds bootmem_pages += np[i].bootmap_pages; 2111da177e4SLinus Torvalds } 2121da177e4SLinus Torvalds 2131da177e4SLinus Torvalds high_memory = __va(memend_pfn << PAGE_SHIFT); 2141da177e4SLinus Torvalds 2151da177e4SLinus Torvalds /* 2161da177e4SLinus Torvalds * This doesn't seem to be used by the Linux memory 2171da177e4SLinus Torvalds * manager any more. If we can get rid of it, we 2181da177e4SLinus Torvalds * also get rid of some of the stuff above as well. 219d42ce812Sakpm@osdl.org * 220d42ce812Sakpm@osdl.org * Note: max_low_pfn and max_pfn reflect the number 221d42ce812Sakpm@osdl.org * of _pages_ in the system, not the maximum PFN. 2221da177e4SLinus Torvalds */ 2231da177e4SLinus Torvalds max_low_pfn = memend_pfn - O_PFN_DOWN(PHYS_OFFSET); 2241da177e4SLinus Torvalds max_pfn = memend_pfn - O_PFN_DOWN(PHYS_OFFSET); 2251da177e4SLinus Torvalds 2261da177e4SLinus Torvalds return bootmem_pages; 2271da177e4SLinus Torvalds } 2281da177e4SLinus Torvalds 2291da177e4SLinus Torvalds static int __init check_initrd(struct meminfo *mi) 2301da177e4SLinus Torvalds { 2311da177e4SLinus Torvalds int initrd_node = -2; 2321da177e4SLinus Torvalds #ifdef CONFIG_BLK_DEV_INITRD 2331da177e4SLinus Torvalds unsigned long end = phys_initrd_start + phys_initrd_size; 2341da177e4SLinus Torvalds 2351da177e4SLinus Torvalds /* 2361da177e4SLinus Torvalds * Make sure that the initrd is within a valid area of 2371da177e4SLinus Torvalds * memory. 2381da177e4SLinus Torvalds */ 2391da177e4SLinus Torvalds if (phys_initrd_size) { 2401da177e4SLinus Torvalds unsigned int i; 2411da177e4SLinus Torvalds 2421da177e4SLinus Torvalds initrd_node = -1; 2431da177e4SLinus Torvalds 2441da177e4SLinus Torvalds for (i = 0; i < mi->nr_banks; i++) { 2451da177e4SLinus Torvalds unsigned long bank_end; 2461da177e4SLinus Torvalds 2471da177e4SLinus Torvalds bank_end = mi->bank[i].start + mi->bank[i].size; 2481da177e4SLinus Torvalds 2491da177e4SLinus Torvalds if (mi->bank[i].start <= phys_initrd_start && 2501da177e4SLinus Torvalds end <= bank_end) 2511da177e4SLinus Torvalds initrd_node = mi->bank[i].node; 2521da177e4SLinus Torvalds } 2531da177e4SLinus Torvalds } 2541da177e4SLinus Torvalds 2551da177e4SLinus Torvalds if (initrd_node == -1) { 2561da177e4SLinus Torvalds printk(KERN_ERR "initrd (0x%08lx - 0x%08lx) extends beyond " 2571da177e4SLinus Torvalds "physical memory - disabling initrd\n", 2581da177e4SLinus Torvalds phys_initrd_start, end); 2591da177e4SLinus Torvalds phys_initrd_start = phys_initrd_size = 0; 2601da177e4SLinus Torvalds } 2611da177e4SLinus Torvalds #endif 2621da177e4SLinus Torvalds 2631da177e4SLinus Torvalds return initrd_node; 2641da177e4SLinus Torvalds } 2651da177e4SLinus Torvalds 2661da177e4SLinus Torvalds /* 2671da177e4SLinus Torvalds * Reserve the various regions of node 0 2681da177e4SLinus Torvalds */ 2691da177e4SLinus Torvalds static __init void reserve_node_zero(unsigned int bootmap_pfn, unsigned int bootmap_pages) 2701da177e4SLinus Torvalds { 2711da177e4SLinus Torvalds pg_data_t *pgdat = NODE_DATA(0); 2721da177e4SLinus Torvalds unsigned long res_size = 0; 2731da177e4SLinus Torvalds 2741da177e4SLinus Torvalds /* 2751da177e4SLinus Torvalds * Register the kernel text and data with bootmem. 2761da177e4SLinus Torvalds * Note that this can only be in node 0. 2771da177e4SLinus Torvalds */ 2781da177e4SLinus Torvalds #ifdef CONFIG_XIP_KERNEL 2791da177e4SLinus Torvalds reserve_bootmem_node(pgdat, __pa(&__data_start), &_end - &__data_start); 2801da177e4SLinus Torvalds #else 2811da177e4SLinus Torvalds reserve_bootmem_node(pgdat, __pa(&_stext), &_end - &_stext); 2821da177e4SLinus Torvalds #endif 2831da177e4SLinus Torvalds 2841da177e4SLinus Torvalds /* 2851da177e4SLinus Torvalds * Reserve the page tables. These are already in use, 2861da177e4SLinus Torvalds * and can only be in node 0. 2871da177e4SLinus Torvalds */ 2881da177e4SLinus Torvalds reserve_bootmem_node(pgdat, __pa(swapper_pg_dir), 2891da177e4SLinus Torvalds PTRS_PER_PGD * sizeof(pgd_t)); 2901da177e4SLinus Torvalds 2911da177e4SLinus Torvalds /* 2921da177e4SLinus Torvalds * And don't forget to reserve the allocator bitmap, 2931da177e4SLinus Torvalds * which will be freed later. 2941da177e4SLinus Torvalds */ 2951da177e4SLinus Torvalds reserve_bootmem_node(pgdat, bootmap_pfn << PAGE_SHIFT, 2961da177e4SLinus Torvalds bootmap_pages << PAGE_SHIFT); 2971da177e4SLinus Torvalds 2981da177e4SLinus Torvalds /* 2991da177e4SLinus Torvalds * Hmm... This should go elsewhere, but we really really need to 3001da177e4SLinus Torvalds * stop things allocating the low memory; ideally we need a better 3011da177e4SLinus Torvalds * implementation of GFP_DMA which does not assume that DMA-able 3021da177e4SLinus Torvalds * memory starts at zero. 3031da177e4SLinus Torvalds */ 3041da177e4SLinus Torvalds if (machine_is_integrator() || machine_is_cintegrator()) 3051da177e4SLinus Torvalds res_size = __pa(swapper_pg_dir) - PHYS_OFFSET; 3061da177e4SLinus Torvalds 3071da177e4SLinus Torvalds /* 3081da177e4SLinus Torvalds * These should likewise go elsewhere. They pre-reserve the 3091da177e4SLinus Torvalds * screen memory region at the start of main system memory. 3101da177e4SLinus Torvalds */ 3111da177e4SLinus Torvalds if (machine_is_edb7211()) 3121da177e4SLinus Torvalds res_size = 0x00020000; 3131da177e4SLinus Torvalds if (machine_is_p720t()) 3141da177e4SLinus Torvalds res_size = 0x00014000; 3151da177e4SLinus Torvalds 3161da177e4SLinus Torvalds #ifdef CONFIG_SA1111 3171da177e4SLinus Torvalds /* 3181da177e4SLinus Torvalds * Because of the SA1111 DMA bug, we want to preserve our 3191da177e4SLinus Torvalds * precious DMA-able memory... 3201da177e4SLinus Torvalds */ 3211da177e4SLinus Torvalds res_size = __pa(swapper_pg_dir) - PHYS_OFFSET; 3221da177e4SLinus Torvalds #endif 3231da177e4SLinus Torvalds if (res_size) 3241da177e4SLinus Torvalds reserve_bootmem_node(pgdat, PHYS_OFFSET, res_size); 3251da177e4SLinus Torvalds } 3261da177e4SLinus Torvalds 3271da177e4SLinus Torvalds /* 3281da177e4SLinus Torvalds * Register all available RAM in this node with the bootmem allocator. 3291da177e4SLinus Torvalds */ 3301da177e4SLinus Torvalds static inline void free_bootmem_node_bank(int node, struct meminfo *mi) 3311da177e4SLinus Torvalds { 3321da177e4SLinus Torvalds pg_data_t *pgdat = NODE_DATA(node); 3331da177e4SLinus Torvalds int bank; 3341da177e4SLinus Torvalds 3351da177e4SLinus Torvalds for (bank = 0; bank < mi->nr_banks; bank++) 3361da177e4SLinus Torvalds if (mi->bank[bank].node == node) 3371da177e4SLinus Torvalds free_bootmem_node(pgdat, mi->bank[bank].start, 3381da177e4SLinus Torvalds mi->bank[bank].size); 3391da177e4SLinus Torvalds } 3401da177e4SLinus Torvalds 3411da177e4SLinus Torvalds /* 3421da177e4SLinus Torvalds * Initialise the bootmem allocator for all nodes. This is called 3431da177e4SLinus Torvalds * early during the architecture specific initialisation. 3441da177e4SLinus Torvalds */ 3451da177e4SLinus Torvalds static void __init bootmem_init(struct meminfo *mi) 3461da177e4SLinus Torvalds { 3471da177e4SLinus Torvalds struct node_info node_info[MAX_NUMNODES], *np = node_info; 3481da177e4SLinus Torvalds unsigned int bootmap_pages, bootmap_pfn, map_pg; 3491da177e4SLinus Torvalds int node, initrd_node; 3501da177e4SLinus Torvalds 3511da177e4SLinus Torvalds bootmap_pages = find_memend_and_nodes(mi, np); 3521da177e4SLinus Torvalds bootmap_pfn = find_bootmap_pfn(0, mi, bootmap_pages); 3531da177e4SLinus Torvalds initrd_node = check_initrd(mi); 3541da177e4SLinus Torvalds 3551da177e4SLinus Torvalds map_pg = bootmap_pfn; 3561da177e4SLinus Torvalds 3571da177e4SLinus Torvalds /* 3581da177e4SLinus Torvalds * Initialise the bootmem nodes. 3591da177e4SLinus Torvalds * 3601da177e4SLinus Torvalds * What we really want to do is: 3611da177e4SLinus Torvalds * 3621da177e4SLinus Torvalds * unmap_all_regions_except_kernel(); 3631da177e4SLinus Torvalds * for_each_node_in_reverse_order(node) { 3641da177e4SLinus Torvalds * map_node(node); 3651da177e4SLinus Torvalds * allocate_bootmem_map(node); 3661da177e4SLinus Torvalds * init_bootmem_node(node); 3671da177e4SLinus Torvalds * free_bootmem_node(node); 3681da177e4SLinus Torvalds * } 3691da177e4SLinus Torvalds * 3701da177e4SLinus Torvalds * but this is a 2.5-type change. For now, we just set 3711da177e4SLinus Torvalds * the nodes up in reverse order. 3721da177e4SLinus Torvalds * 3731da177e4SLinus Torvalds * (we could also do with rolling bootmem_init and paging_init 3741da177e4SLinus Torvalds * into one generic "memory_init" type function). 3751da177e4SLinus Torvalds */ 3761da177e4SLinus Torvalds np += num_online_nodes() - 1; 3771da177e4SLinus Torvalds for (node = num_online_nodes() - 1; node >= 0; node--, np--) { 3781da177e4SLinus Torvalds /* 3791da177e4SLinus Torvalds * If there are no pages in this node, ignore it. 3801da177e4SLinus Torvalds * Note that node 0 must always have some pages. 3811da177e4SLinus Torvalds */ 3821da177e4SLinus Torvalds if (np->end == 0 || !node_online(node)) { 3831da177e4SLinus Torvalds if (node == 0) 3841da177e4SLinus Torvalds BUG(); 3851da177e4SLinus Torvalds continue; 3861da177e4SLinus Torvalds } 3871da177e4SLinus Torvalds 3881da177e4SLinus Torvalds /* 3891da177e4SLinus Torvalds * Initialise the bootmem allocator. 3901da177e4SLinus Torvalds */ 3911da177e4SLinus Torvalds init_bootmem_node(NODE_DATA(node), map_pg, np->start, np->end); 3921da177e4SLinus Torvalds free_bootmem_node_bank(node, mi); 3931da177e4SLinus Torvalds map_pg += np->bootmap_pages; 3941da177e4SLinus Torvalds 3951da177e4SLinus Torvalds /* 3961da177e4SLinus Torvalds * If this is node 0, we need to reserve some areas ASAP - 3971da177e4SLinus Torvalds * we may use bootmem on node 0 to setup the other nodes. 3981da177e4SLinus Torvalds */ 3991da177e4SLinus Torvalds if (node == 0) 4001da177e4SLinus Torvalds reserve_node_zero(bootmap_pfn, bootmap_pages); 4011da177e4SLinus Torvalds } 4021da177e4SLinus Torvalds 4031da177e4SLinus Torvalds 4041da177e4SLinus Torvalds #ifdef CONFIG_BLK_DEV_INITRD 4051da177e4SLinus Torvalds if (phys_initrd_size && initrd_node >= 0) { 4061da177e4SLinus Torvalds reserve_bootmem_node(NODE_DATA(initrd_node), phys_initrd_start, 4071da177e4SLinus Torvalds phys_initrd_size); 4081da177e4SLinus Torvalds initrd_start = __phys_to_virt(phys_initrd_start); 4091da177e4SLinus Torvalds initrd_end = initrd_start + phys_initrd_size; 4101da177e4SLinus Torvalds } 4111da177e4SLinus Torvalds #endif 4121da177e4SLinus Torvalds 4131da177e4SLinus Torvalds BUG_ON(map_pg != bootmap_pfn + bootmap_pages); 4141da177e4SLinus Torvalds } 4151da177e4SLinus Torvalds 4161da177e4SLinus Torvalds /* 4171da177e4SLinus Torvalds * paging_init() sets up the page tables, initialises the zone memory 4181da177e4SLinus Torvalds * maps, and sets up the zero page, bad page and bad page tables. 4191da177e4SLinus Torvalds */ 4201da177e4SLinus Torvalds void __init paging_init(struct meminfo *mi, struct machine_desc *mdesc) 4211da177e4SLinus Torvalds { 4221da177e4SLinus Torvalds void *zero_page; 4231da177e4SLinus Torvalds int node; 4241da177e4SLinus Torvalds 4251da177e4SLinus Torvalds bootmem_init(mi); 4261da177e4SLinus Torvalds 4271da177e4SLinus Torvalds memcpy(&meminfo, mi, sizeof(meminfo)); 4281da177e4SLinus Torvalds 4291da177e4SLinus Torvalds /* 4301da177e4SLinus Torvalds * allocate the zero page. Note that we count on this going ok. 4311da177e4SLinus Torvalds */ 4321da177e4SLinus Torvalds zero_page = alloc_bootmem_low_pages(PAGE_SIZE); 4331da177e4SLinus Torvalds 4341da177e4SLinus Torvalds /* 4351da177e4SLinus Torvalds * initialise the page tables. 4361da177e4SLinus Torvalds */ 4371da177e4SLinus Torvalds memtable_init(mi); 4381da177e4SLinus Torvalds if (mdesc->map_io) 4391da177e4SLinus Torvalds mdesc->map_io(); 4401da177e4SLinus Torvalds flush_tlb_all(); 4411da177e4SLinus Torvalds 4421da177e4SLinus Torvalds /* 4431da177e4SLinus Torvalds * initialise the zones within each node 4441da177e4SLinus Torvalds */ 4451da177e4SLinus Torvalds for_each_online_node(node) { 4461da177e4SLinus Torvalds unsigned long zone_size[MAX_NR_ZONES]; 4471da177e4SLinus Torvalds unsigned long zhole_size[MAX_NR_ZONES]; 4481da177e4SLinus Torvalds struct bootmem_data *bdata; 4491da177e4SLinus Torvalds pg_data_t *pgdat; 4501da177e4SLinus Torvalds int i; 4511da177e4SLinus Torvalds 4521da177e4SLinus Torvalds /* 4531da177e4SLinus Torvalds * Initialise the zone size information. 4541da177e4SLinus Torvalds */ 4551da177e4SLinus Torvalds for (i = 0; i < MAX_NR_ZONES; i++) { 4561da177e4SLinus Torvalds zone_size[i] = 0; 4571da177e4SLinus Torvalds zhole_size[i] = 0; 4581da177e4SLinus Torvalds } 4591da177e4SLinus Torvalds 4601da177e4SLinus Torvalds pgdat = NODE_DATA(node); 4611da177e4SLinus Torvalds bdata = pgdat->bdata; 4621da177e4SLinus Torvalds 4631da177e4SLinus Torvalds /* 4641da177e4SLinus Torvalds * The size of this node has already been determined. 4651da177e4SLinus Torvalds * If we need to do anything fancy with the allocation 4661da177e4SLinus Torvalds * of this memory to the zones, now is the time to do 4671da177e4SLinus Torvalds * it. 4681da177e4SLinus Torvalds */ 4691da177e4SLinus Torvalds zone_size[0] = bdata->node_low_pfn - 4701da177e4SLinus Torvalds (bdata->node_boot_start >> PAGE_SHIFT); 4711da177e4SLinus Torvalds 4721da177e4SLinus Torvalds /* 4731da177e4SLinus Torvalds * If this zone has zero size, skip it. 4741da177e4SLinus Torvalds */ 4751da177e4SLinus Torvalds if (!zone_size[0]) 4761da177e4SLinus Torvalds continue; 4771da177e4SLinus Torvalds 4781da177e4SLinus Torvalds /* 4791da177e4SLinus Torvalds * For each bank in this node, calculate the size of the 4801da177e4SLinus Torvalds * holes. holes = node_size - sum(bank_sizes_in_node) 4811da177e4SLinus Torvalds */ 4821da177e4SLinus Torvalds zhole_size[0] = zone_size[0]; 4831da177e4SLinus Torvalds for (i = 0; i < mi->nr_banks; i++) { 4841da177e4SLinus Torvalds if (mi->bank[i].node != node) 4851da177e4SLinus Torvalds continue; 4861da177e4SLinus Torvalds 4871da177e4SLinus Torvalds zhole_size[0] -= mi->bank[i].size >> PAGE_SHIFT; 4881da177e4SLinus Torvalds } 4891da177e4SLinus Torvalds 4901da177e4SLinus Torvalds /* 4911da177e4SLinus Torvalds * Adjust the sizes according to any special 4921da177e4SLinus Torvalds * requirements for this machine type. 4931da177e4SLinus Torvalds */ 4941da177e4SLinus Torvalds arch_adjust_zones(node, zone_size, zhole_size); 4951da177e4SLinus Torvalds 4961da177e4SLinus Torvalds free_area_init_node(node, pgdat, zone_size, 4971da177e4SLinus Torvalds bdata->node_boot_start >> PAGE_SHIFT, zhole_size); 4981da177e4SLinus Torvalds } 4991da177e4SLinus Torvalds 5001da177e4SLinus Torvalds /* 5011da177e4SLinus Torvalds * finish off the bad pages once 5021da177e4SLinus Torvalds * the mem_map is initialised 5031da177e4SLinus Torvalds */ 5041da177e4SLinus Torvalds memzero(zero_page, PAGE_SIZE); 5051da177e4SLinus Torvalds empty_zero_page = virt_to_page(zero_page); 5061da177e4SLinus Torvalds flush_dcache_page(empty_zero_page); 5071da177e4SLinus Torvalds } 5081da177e4SLinus Torvalds 5091da177e4SLinus Torvalds static inline void free_area(unsigned long addr, unsigned long end, char *s) 5101da177e4SLinus Torvalds { 5111da177e4SLinus Torvalds unsigned int size = (end - addr) >> 10; 5121da177e4SLinus Torvalds 5131da177e4SLinus Torvalds for (; addr < end; addr += PAGE_SIZE) { 5141da177e4SLinus Torvalds struct page *page = virt_to_page(addr); 5151da177e4SLinus Torvalds ClearPageReserved(page); 5161da177e4SLinus Torvalds set_page_count(page, 1); 5171da177e4SLinus Torvalds free_page(addr); 5181da177e4SLinus Torvalds totalram_pages++; 5191da177e4SLinus Torvalds } 5201da177e4SLinus Torvalds 5211da177e4SLinus Torvalds if (size && s) 5221da177e4SLinus Torvalds printk(KERN_INFO "Freeing %s memory: %dK\n", s, size); 5231da177e4SLinus Torvalds } 5241da177e4SLinus Torvalds 525a013053dSRussell King static inline void 526a013053dSRussell King free_memmap(int node, unsigned long start_pfn, unsigned long end_pfn) 527a013053dSRussell King { 528a013053dSRussell King struct page *start_pg, *end_pg; 529a013053dSRussell King unsigned long pg, pgend; 530a013053dSRussell King 531a013053dSRussell King /* 532a013053dSRussell King * Convert start_pfn/end_pfn to a struct page pointer. 533a013053dSRussell King */ 534a013053dSRussell King start_pg = pfn_to_page(start_pfn); 535a013053dSRussell King end_pg = pfn_to_page(end_pfn); 536a013053dSRussell King 537a013053dSRussell King /* 538a013053dSRussell King * Convert to physical addresses, and 539a013053dSRussell King * round start upwards and end downwards. 540a013053dSRussell King */ 541a013053dSRussell King pg = PAGE_ALIGN(__pa(start_pg)); 542a013053dSRussell King pgend = __pa(end_pg) & PAGE_MASK; 543a013053dSRussell King 544a013053dSRussell King /* 545a013053dSRussell King * If there are free pages between these, 546a013053dSRussell King * free the section of the memmap array. 547a013053dSRussell King */ 548a013053dSRussell King if (pg < pgend) 549a013053dSRussell King free_bootmem_node(NODE_DATA(node), pg, pgend - pg); 550a013053dSRussell King } 551a013053dSRussell King 552a013053dSRussell King /* 553a013053dSRussell King * The mem_map array can get very big. Free the unused area of the memory map. 554a013053dSRussell King */ 555a013053dSRussell King static void __init free_unused_memmap_node(int node, struct meminfo *mi) 556a013053dSRussell King { 557a013053dSRussell King unsigned long bank_start, prev_bank_end = 0; 558a013053dSRussell King unsigned int i; 559a013053dSRussell King 560a013053dSRussell King /* 561a013053dSRussell King * [FIXME] This relies on each bank being in address order. This 562a013053dSRussell King * may not be the case, especially if the user has provided the 563a013053dSRussell King * information on the command line. 564a013053dSRussell King */ 565a013053dSRussell King for (i = 0; i < mi->nr_banks; i++) { 566a013053dSRussell King if (mi->bank[i].size == 0 || mi->bank[i].node != node) 567a013053dSRussell King continue; 568a013053dSRussell King 569a013053dSRussell King bank_start = mi->bank[i].start >> PAGE_SHIFT; 570a013053dSRussell King if (bank_start < prev_bank_end) { 571a013053dSRussell King printk(KERN_ERR "MEM: unordered memory banks. " 572a013053dSRussell King "Not freeing memmap.\n"); 573a013053dSRussell King break; 574a013053dSRussell King } 575a013053dSRussell King 576a013053dSRussell King /* 577a013053dSRussell King * If we had a previous bank, and there is a space 578a013053dSRussell King * between the current bank and the previous, free it. 579a013053dSRussell King */ 580a013053dSRussell King if (prev_bank_end && prev_bank_end != bank_start) 581a013053dSRussell King free_memmap(node, prev_bank_end, bank_start); 582a013053dSRussell King 583a013053dSRussell King prev_bank_end = (mi->bank[i].start + 584a013053dSRussell King mi->bank[i].size) >> PAGE_SHIFT; 585a013053dSRussell King } 586a013053dSRussell King } 587a013053dSRussell King 5881da177e4SLinus Torvalds /* 5891da177e4SLinus Torvalds * mem_init() marks the free areas in the mem_map and tells us how much 5901da177e4SLinus Torvalds * memory is free. This is done after various parts of the system have 5911da177e4SLinus Torvalds * claimed their memory after the kernel image. 5921da177e4SLinus Torvalds */ 5931da177e4SLinus Torvalds void __init mem_init(void) 5941da177e4SLinus Torvalds { 5951da177e4SLinus Torvalds unsigned int codepages, datapages, initpages; 5961da177e4SLinus Torvalds int i, node; 5971da177e4SLinus Torvalds 5981da177e4SLinus Torvalds codepages = &_etext - &_text; 5991da177e4SLinus Torvalds datapages = &_end - &__data_start; 6001da177e4SLinus Torvalds initpages = &__init_end - &__init_begin; 6011da177e4SLinus Torvalds 6021da177e4SLinus Torvalds #ifndef CONFIG_DISCONTIGMEM 6031da177e4SLinus Torvalds max_mapnr = virt_to_page(high_memory) - mem_map; 6041da177e4SLinus Torvalds #endif 6051da177e4SLinus Torvalds 6061da177e4SLinus Torvalds /* this will put all unused low memory onto the freelists */ 6071da177e4SLinus Torvalds for_each_online_node(node) { 6081da177e4SLinus Torvalds pg_data_t *pgdat = NODE_DATA(node); 6091da177e4SLinus Torvalds 610a013053dSRussell King free_unused_memmap_node(node, &meminfo); 611a013053dSRussell King 6121da177e4SLinus Torvalds if (pgdat->node_spanned_pages != 0) 6131da177e4SLinus Torvalds totalram_pages += free_all_bootmem_node(pgdat); 6141da177e4SLinus Torvalds } 6151da177e4SLinus Torvalds 6161da177e4SLinus Torvalds #ifdef CONFIG_SA1111 6171da177e4SLinus Torvalds /* now that our DMA memory is actually so designated, we can free it */ 6181da177e4SLinus Torvalds free_area(PAGE_OFFSET, (unsigned long)swapper_pg_dir, NULL); 6191da177e4SLinus Torvalds #endif 6201da177e4SLinus Torvalds 6211da177e4SLinus Torvalds /* 6221da177e4SLinus Torvalds * Since our memory may not be contiguous, calculate the 6231da177e4SLinus Torvalds * real number of pages we have in this system 6241da177e4SLinus Torvalds */ 6251da177e4SLinus Torvalds printk(KERN_INFO "Memory:"); 6261da177e4SLinus Torvalds 6271da177e4SLinus Torvalds num_physpages = 0; 6281da177e4SLinus Torvalds for (i = 0; i < meminfo.nr_banks; i++) { 6291da177e4SLinus Torvalds num_physpages += meminfo.bank[i].size >> PAGE_SHIFT; 6301da177e4SLinus Torvalds printk(" %ldMB", meminfo.bank[i].size >> 20); 6311da177e4SLinus Torvalds } 6321da177e4SLinus Torvalds 6331da177e4SLinus Torvalds printk(" = %luMB total\n", num_physpages >> (20 - PAGE_SHIFT)); 6341da177e4SLinus Torvalds printk(KERN_NOTICE "Memory: %luKB available (%dK code, " 6351da177e4SLinus Torvalds "%dK data, %dK init)\n", 6361da177e4SLinus Torvalds (unsigned long) nr_free_pages() << (PAGE_SHIFT-10), 6371da177e4SLinus Torvalds codepages >> 10, datapages >> 10, initpages >> 10); 6381da177e4SLinus Torvalds 6391da177e4SLinus Torvalds if (PAGE_SIZE >= 16384 && num_physpages <= 128) { 6401da177e4SLinus Torvalds extern int sysctl_overcommit_memory; 6411da177e4SLinus Torvalds /* 6421da177e4SLinus Torvalds * On a machine this small we won't get 6431da177e4SLinus Torvalds * anywhere without overcommit, so turn 6441da177e4SLinus Torvalds * it on by default. 6451da177e4SLinus Torvalds */ 6461da177e4SLinus Torvalds sysctl_overcommit_memory = OVERCOMMIT_ALWAYS; 6471da177e4SLinus Torvalds } 6481da177e4SLinus Torvalds } 6491da177e4SLinus Torvalds 6501da177e4SLinus Torvalds void free_initmem(void) 6511da177e4SLinus Torvalds { 6521da177e4SLinus Torvalds if (!machine_is_integrator() && !machine_is_cintegrator()) { 6531da177e4SLinus Torvalds free_area((unsigned long)(&__init_begin), 6541da177e4SLinus Torvalds (unsigned long)(&__init_end), 6551da177e4SLinus Torvalds "init"); 6561da177e4SLinus Torvalds } 6571da177e4SLinus Torvalds } 6581da177e4SLinus Torvalds 6591da177e4SLinus Torvalds #ifdef CONFIG_BLK_DEV_INITRD 6601da177e4SLinus Torvalds 6611da177e4SLinus Torvalds static int keep_initrd; 6621da177e4SLinus Torvalds 6631da177e4SLinus Torvalds void free_initrd_mem(unsigned long start, unsigned long end) 6641da177e4SLinus Torvalds { 6651da177e4SLinus Torvalds if (!keep_initrd) 6661da177e4SLinus Torvalds free_area(start, end, "initrd"); 6671da177e4SLinus Torvalds } 6681da177e4SLinus Torvalds 6691da177e4SLinus Torvalds static int __init keepinitrd_setup(char *__unused) 6701da177e4SLinus Torvalds { 6711da177e4SLinus Torvalds keep_initrd = 1; 6721da177e4SLinus Torvalds return 1; 6731da177e4SLinus Torvalds } 6741da177e4SLinus Torvalds 6751da177e4SLinus Torvalds __setup("keepinitrd", keepinitrd_setup); 6761da177e4SLinus Torvalds #endif 677