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> 18b7cfda9fSRussell King #include <linux/sort.h> 193835f6cbSNicolas Pitre #include <linux/highmem.h> 201da177e4SLinus Torvalds 211da177e4SLinus Torvalds #include <asm/mach-types.h> 2237efe642SRussell King #include <asm/sections.h> 231da177e4SLinus Torvalds #include <asm/setup.h> 2474d02fb9SRussell King #include <asm/sizes.h> 251da177e4SLinus Torvalds #include <asm/tlb.h> 261da177e4SLinus Torvalds 271da177e4SLinus Torvalds #include <asm/mach/arch.h> 281da177e4SLinus Torvalds #include <asm/mach/map.h> 291da177e4SLinus Torvalds 301b2e2b73SRussell King #include "mm.h" 311b2e2b73SRussell King 32012d1f4aSRussell King static unsigned long phys_initrd_start __initdata = 0; 33012d1f4aSRussell King static unsigned long phys_initrd_size __initdata = 0; 34012d1f4aSRussell King 352b0d8c25SJeremy Kerr static int __init early_initrd(char *p) 36012d1f4aSRussell King { 37012d1f4aSRussell King unsigned long start, size; 382b0d8c25SJeremy Kerr char *endp; 39012d1f4aSRussell King 402b0d8c25SJeremy Kerr start = memparse(p, &endp); 412b0d8c25SJeremy Kerr if (*endp == ',') { 422b0d8c25SJeremy Kerr size = memparse(endp + 1, NULL); 43012d1f4aSRussell King 44012d1f4aSRussell King phys_initrd_start = start; 45012d1f4aSRussell King phys_initrd_size = size; 46012d1f4aSRussell King } 472b0d8c25SJeremy Kerr return 0; 48012d1f4aSRussell King } 492b0d8c25SJeremy Kerr early_param("initrd", early_initrd); 50012d1f4aSRussell King 51012d1f4aSRussell King static int __init parse_tag_initrd(const struct tag *tag) 52012d1f4aSRussell King { 53012d1f4aSRussell King printk(KERN_WARNING "ATAG_INITRD is deprecated; " 54012d1f4aSRussell King "please update your bootloader.\n"); 55012d1f4aSRussell King phys_initrd_start = __virt_to_phys(tag->u.initrd.start); 56012d1f4aSRussell King phys_initrd_size = tag->u.initrd.size; 57012d1f4aSRussell King return 0; 58012d1f4aSRussell King } 59012d1f4aSRussell King 60012d1f4aSRussell King __tagtable(ATAG_INITRD, parse_tag_initrd); 61012d1f4aSRussell King 62012d1f4aSRussell King static int __init parse_tag_initrd2(const struct tag *tag) 63012d1f4aSRussell King { 64012d1f4aSRussell King phys_initrd_start = tag->u.initrd.start; 65012d1f4aSRussell King phys_initrd_size = tag->u.initrd.size; 66012d1f4aSRussell King return 0; 67012d1f4aSRussell King } 68012d1f4aSRussell King 69012d1f4aSRussell King __tagtable(ATAG_INITRD2, parse_tag_initrd2); 701da177e4SLinus Torvalds 711da177e4SLinus Torvalds /* 724b5f32ceSNicolas Pitre * This keeps memory configuration data used by a couple memory 734b5f32ceSNicolas Pitre * initialization functions, as well as show_mem() for the skipping 744b5f32ceSNicolas Pitre * of holes in the memory map. It is populated by arm_add_memory(). 751da177e4SLinus Torvalds */ 764b5f32ceSNicolas Pitre struct meminfo meminfo; 775e709827SRay Lehtiniemi 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); 88b7a69ac3SRussell King struct page *map = pgdat_page_nr(n, 0) - n->node_start_pfn; 89204ecae4SRussell King 905e709827SRay Lehtiniemi for_each_nodebank (i,mi,node) { 91d2a38ef9SRussell King struct membank *bank = &mi->bank[i]; 925e709827SRay Lehtiniemi unsigned int pfn1, pfn2; 931da177e4SLinus Torvalds struct page *page, *end; 941da177e4SLinus Torvalds 95d2a38ef9SRussell King pfn1 = bank_pfn_start(bank); 96d2a38ef9SRussell King pfn2 = bank_pfn_end(bank); 975e709827SRay Lehtiniemi 98204ecae4SRussell King page = map + pfn1; 99204ecae4SRussell King end = map + pfn2; 1001da177e4SLinus Torvalds 1011da177e4SLinus Torvalds do { 1021da177e4SLinus Torvalds total++; 1031da177e4SLinus Torvalds if (PageReserved(page)) 1041da177e4SLinus Torvalds reserved++; 1051da177e4SLinus Torvalds else if (PageSwapCache(page)) 1061da177e4SLinus Torvalds cached++; 1071da177e4SLinus Torvalds else if (PageSlab(page)) 1081da177e4SLinus Torvalds slab++; 1091da177e4SLinus Torvalds else if (!page_count(page)) 1101da177e4SLinus Torvalds free++; 1111da177e4SLinus Torvalds else 1121da177e4SLinus Torvalds shared += page_count(page) - 1; 1131da177e4SLinus Torvalds page++; 1141da177e4SLinus Torvalds } while (page < end); 1151da177e4SLinus Torvalds } 1165e709827SRay Lehtiniemi } 1171da177e4SLinus Torvalds 1181da177e4SLinus Torvalds printk("%d pages of RAM\n", total); 1191da177e4SLinus Torvalds printk("%d free pages\n", free); 1201da177e4SLinus Torvalds printk("%d reserved pages\n", reserved); 1211da177e4SLinus Torvalds printk("%d slab pages\n", slab); 1221da177e4SLinus Torvalds printk("%d pages shared\n", shared); 1231da177e4SLinus Torvalds printk("%d pages swap cached\n", cached); 1241da177e4SLinus Torvalds } 1251da177e4SLinus Torvalds 126dde5828fSRussell King static void __init find_node_limits(int node, struct meminfo *mi, 127dde5828fSRussell King unsigned long *min, unsigned long *max_low, unsigned long *max_high) 128dde5828fSRussell King { 129dde5828fSRussell King int i; 130dde5828fSRussell King 131dde5828fSRussell King *min = -1UL; 132dde5828fSRussell King *max_low = *max_high = 0; 133dde5828fSRussell King 134dde5828fSRussell King for_each_nodebank(i, mi, node) { 135dde5828fSRussell King struct membank *bank = &mi->bank[i]; 136dde5828fSRussell King unsigned long start, end; 137dde5828fSRussell King 138dde5828fSRussell King start = bank_pfn_start(bank); 139dde5828fSRussell King end = bank_pfn_end(bank); 140dde5828fSRussell King 141dde5828fSRussell King if (*min > start) 142dde5828fSRussell King *min = start; 143dde5828fSRussell King if (*max_high < end) 144dde5828fSRussell King *max_high = end; 145dde5828fSRussell King if (bank->highmem) 146dde5828fSRussell King continue; 147dde5828fSRussell King if (*max_low < end) 148dde5828fSRussell King *max_low = end; 149dde5828fSRussell King } 150dde5828fSRussell King } 151dde5828fSRussell King 1521da177e4SLinus Torvalds /* 1531da177e4SLinus Torvalds * FIXME: We really want to avoid allocating the bootmap bitmap 1541da177e4SLinus Torvalds * over the top of the initrd. Hopefully, this is located towards 1551da177e4SLinus Torvalds * the start of a bank, so if we allocate the bootmap bitmap at 1561da177e4SLinus Torvalds * the end, we won't clash. 1571da177e4SLinus Torvalds */ 1581da177e4SLinus Torvalds static unsigned int __init 1591da177e4SLinus Torvalds find_bootmap_pfn(int node, struct meminfo *mi, unsigned int bootmap_pages) 1601da177e4SLinus Torvalds { 161d2a38ef9SRussell King unsigned int start_pfn, i, bootmap_pfn; 1621da177e4SLinus Torvalds 16337efe642SRussell King start_pfn = PAGE_ALIGN(__pa(_end)) >> PAGE_SHIFT; 1641da177e4SLinus Torvalds bootmap_pfn = 0; 1651da177e4SLinus Torvalds 166d2a38ef9SRussell King for_each_nodebank(i, mi, node) { 167d2a38ef9SRussell King struct membank *bank = &mi->bank[i]; 1681da177e4SLinus Torvalds unsigned int start, end; 1691da177e4SLinus Torvalds 170d2a38ef9SRussell King start = bank_pfn_start(bank); 171d2a38ef9SRussell King end = bank_pfn_end(bank); 1721da177e4SLinus Torvalds 1731da177e4SLinus Torvalds if (end < start_pfn) 1741da177e4SLinus Torvalds continue; 1751da177e4SLinus Torvalds 1761da177e4SLinus Torvalds if (start < start_pfn) 1771da177e4SLinus Torvalds start = start_pfn; 1781da177e4SLinus Torvalds 1791da177e4SLinus Torvalds if (end <= start) 1801da177e4SLinus Torvalds continue; 1811da177e4SLinus Torvalds 1821da177e4SLinus Torvalds if (end - start >= bootmap_pages) { 1831da177e4SLinus Torvalds bootmap_pfn = start; 1841da177e4SLinus Torvalds break; 1851da177e4SLinus Torvalds } 1861da177e4SLinus Torvalds } 1871da177e4SLinus Torvalds 1881da177e4SLinus Torvalds if (bootmap_pfn == 0) 1891da177e4SLinus Torvalds BUG(); 1901da177e4SLinus Torvalds 1911da177e4SLinus Torvalds return bootmap_pfn; 1921da177e4SLinus Torvalds } 1931da177e4SLinus Torvalds 1941da177e4SLinus Torvalds static int __init check_initrd(struct meminfo *mi) 1951da177e4SLinus Torvalds { 1961da177e4SLinus Torvalds int initrd_node = -2; 1971da177e4SLinus Torvalds #ifdef CONFIG_BLK_DEV_INITRD 1981da177e4SLinus Torvalds unsigned long end = phys_initrd_start + phys_initrd_size; 1991da177e4SLinus Torvalds 2001da177e4SLinus Torvalds /* 2011da177e4SLinus Torvalds * Make sure that the initrd is within a valid area of 2021da177e4SLinus Torvalds * memory. 2031da177e4SLinus Torvalds */ 2041da177e4SLinus Torvalds if (phys_initrd_size) { 2051da177e4SLinus Torvalds unsigned int i; 2061da177e4SLinus Torvalds 2071da177e4SLinus Torvalds initrd_node = -1; 2081da177e4SLinus Torvalds 2091da177e4SLinus Torvalds for (i = 0; i < mi->nr_banks; i++) { 210d2a38ef9SRussell King struct membank *bank = &mi->bank[i]; 211d2a38ef9SRussell King if (bank_phys_start(bank) <= phys_initrd_start && 212d2a38ef9SRussell King end <= bank_phys_end(bank)) 213d2a38ef9SRussell King initrd_node = bank->node; 2141da177e4SLinus Torvalds } 2151da177e4SLinus Torvalds } 2161da177e4SLinus Torvalds 2171da177e4SLinus Torvalds if (initrd_node == -1) { 218b962a286SRussell King printk(KERN_ERR "INITRD: 0x%08lx+0x%08lx extends beyond " 2191da177e4SLinus Torvalds "physical memory - disabling initrd\n", 220b962a286SRussell King phys_initrd_start, phys_initrd_size); 2211da177e4SLinus Torvalds phys_initrd_start = phys_initrd_size = 0; 2221da177e4SLinus Torvalds } 2231da177e4SLinus Torvalds #endif 2241da177e4SLinus Torvalds 2251da177e4SLinus Torvalds return initrd_node; 2261da177e4SLinus Torvalds } 2271da177e4SLinus Torvalds 228456335e2SRussell King static inline void map_memory_bank(struct membank *bank) 229456335e2SRussell King { 230d111e8f9SRussell King #ifdef CONFIG_MMU 231456335e2SRussell King struct map_desc map; 232456335e2SRussell King 233d2a38ef9SRussell King map.pfn = bank_pfn_start(bank); 234d2a38ef9SRussell King map.virtual = __phys_to_virt(bank_phys_start(bank)); 235d2a38ef9SRussell King map.length = bank_phys_size(bank); 236456335e2SRussell King map.type = MT_MEMORY; 237456335e2SRussell King 238456335e2SRussell King create_mapping(&map); 239d111e8f9SRussell King #endif 240456335e2SRussell King } 241456335e2SRussell King 242dde5828fSRussell King static void __init bootmem_init_node(int node, struct meminfo *mi, 243dde5828fSRussell King unsigned long start_pfn, unsigned long end_pfn) 2441da177e4SLinus Torvalds { 245dde5828fSRussell King unsigned long boot_pfn; 24690072059SRussell King unsigned int boot_pages; 24790072059SRussell King pg_data_t *pgdat; 24890072059SRussell King int i; 2491da177e4SLinus Torvalds 25090072059SRussell King /* 251dde5828fSRussell King * Map the memory banks for this node. 25290072059SRussell King */ 25390072059SRussell King for_each_nodebank(i, mi, node) { 254456335e2SRussell King struct membank *bank = &mi->bank[i]; 25590072059SRussell King 256dde5828fSRussell King if (!bank->highmem) 257456335e2SRussell King map_memory_bank(bank); 2581da177e4SLinus Torvalds } 2591da177e4SLinus Torvalds 2601da177e4SLinus Torvalds /* 26190072059SRussell King * Allocate the bootmem bitmap page. 2621da177e4SLinus Torvalds */ 26390072059SRussell King boot_pages = bootmem_bootmap_pages(end_pfn - start_pfn); 26490072059SRussell King boot_pfn = find_bootmap_pfn(node, mi, boot_pages); 2651da177e4SLinus Torvalds 2661da177e4SLinus Torvalds /* 26790072059SRussell King * Initialise the bootmem allocator for this node, handing the 26890072059SRussell King * memory banks over to bootmem. 2691da177e4SLinus Torvalds */ 27090072059SRussell King node_set_online(node); 27190072059SRussell King pgdat = NODE_DATA(node); 27290072059SRussell King init_bootmem_node(pgdat, boot_pfn, start_pfn, end_pfn); 27390072059SRussell King 274d2a38ef9SRussell King for_each_nodebank(i, mi, node) { 275d2a38ef9SRussell King struct membank *bank = &mi->bank[i]; 276dde5828fSRussell King if (!bank->highmem) 277d2a38ef9SRussell King free_bootmem_node(pgdat, bank_phys_start(bank), bank_phys_size(bank)); 278d2a38ef9SRussell King } 2791da177e4SLinus Torvalds 2801da177e4SLinus Torvalds /* 28190072059SRussell King * Reserve the bootmem bitmap for this node. 2821da177e4SLinus Torvalds */ 28390072059SRussell King reserve_bootmem_node(pgdat, boot_pfn << PAGE_SHIFT, 28472a7fe39SBernhard Walle boot_pages << PAGE_SHIFT, BOOTMEM_DEFAULT); 285b7a69ac3SRussell King } 286b962a286SRussell King 287b7a69ac3SRussell King static void __init bootmem_reserve_initrd(int node) 288b7a69ac3SRussell King { 2891da177e4SLinus Torvalds #ifdef CONFIG_BLK_DEV_INITRD 290b7a69ac3SRussell King pg_data_t *pgdat = NODE_DATA(node); 291b7a69ac3SRussell King int res; 292b7a69ac3SRussell King 293b7a69ac3SRussell King res = reserve_bootmem_node(pgdat, phys_initrd_start, 294b962a286SRussell King phys_initrd_size, BOOTMEM_EXCLUSIVE); 295b962a286SRussell King 296b962a286SRussell King if (res == 0) { 2971da177e4SLinus Torvalds initrd_start = __phys_to_virt(phys_initrd_start); 2981da177e4SLinus Torvalds initrd_end = initrd_start + phys_initrd_size; 299b962a286SRussell King } else { 300b962a286SRussell King printk(KERN_ERR 301b962a286SRussell King "INITRD: 0x%08lx+0x%08lx overlaps in-use " 302b962a286SRussell King "memory region - disabling initrd\n", 303b962a286SRussell King phys_initrd_start, phys_initrd_size); 304b962a286SRussell King } 3051da177e4SLinus Torvalds #endif 306b7a69ac3SRussell King } 307b7a69ac3SRussell King 308b7a69ac3SRussell King static void __init bootmem_free_node(int node, struct meminfo *mi) 309b7a69ac3SRussell King { 310b7a69ac3SRussell King unsigned long zone_size[MAX_NR_ZONES], zhole_size[MAX_NR_ZONES]; 311dde5828fSRussell King unsigned long min, max_low, max_high; 312b7a69ac3SRussell King int i; 313b7a69ac3SRussell King 314dde5828fSRussell King find_node_limits(node, mi, &min, &max_low, &max_high); 3151da177e4SLinus Torvalds 31690072059SRussell King /* 31790072059SRussell King * initialise the zones within this node. 31890072059SRussell King */ 31990072059SRussell King memset(zone_size, 0, sizeof(zone_size)); 32090072059SRussell King 32190072059SRussell King /* 32290072059SRussell King * The size of this node has already been determined. If we need 32390072059SRussell King * to do anything fancy with the allocation of this memory to the 32490072059SRussell King * zones, now is the time to do it. 32590072059SRussell King */ 326dde5828fSRussell King zone_size[0] = max_low - min; 327dde5828fSRussell King #ifdef CONFIG_HIGHMEM 328dde5828fSRussell King zone_size[ZONE_HIGHMEM] = max_high - max_low; 329dde5828fSRussell King #endif 33090072059SRussell King 33190072059SRussell King /* 33290072059SRussell King * For each bank in this node, calculate the size of the holes. 33390072059SRussell King * holes = node_size - sum(bank_sizes_in_node) 33490072059SRussell King */ 335dde5828fSRussell King memcpy(zhole_size, zone_size, sizeof(zhole_size)); 336dde5828fSRussell King for_each_nodebank(i, mi, node) { 337dde5828fSRussell King int idx = 0; 338dde5828fSRussell King #ifdef CONFIG_HIGHMEM 339dde5828fSRussell King if (mi->bank[i].highmem) 340dde5828fSRussell King idx = ZONE_HIGHMEM; 341dde5828fSRussell King #endif 342dde5828fSRussell King zhole_size[idx] -= bank_pfn_size(&mi->bank[i]); 343dde5828fSRussell King } 34490072059SRussell King 34590072059SRussell King /* 34690072059SRussell King * Adjust the sizes according to any special requirements for 34790072059SRussell King * this machine type. 34890072059SRussell King */ 34990072059SRussell King arch_adjust_zones(node, zone_size, zhole_size); 35090072059SRussell King 351dde5828fSRussell King free_area_init_node(node, zone_size, min, zhole_size); 35290072059SRussell King } 35390072059SRussell King 354b7cfda9fSRussell King #ifndef CONFIG_SPARSEMEM 355b7cfda9fSRussell King int pfn_valid(unsigned long pfn) 356b7cfda9fSRussell King { 357b7cfda9fSRussell King struct meminfo *mi = &meminfo; 358b7cfda9fSRussell King unsigned int left = 0, right = mi->nr_banks; 359b7cfda9fSRussell King 360b7cfda9fSRussell King do { 361b7cfda9fSRussell King unsigned int mid = (right + left) / 2; 362b7cfda9fSRussell King struct membank *bank = &mi->bank[mid]; 363b7cfda9fSRussell King 364b7cfda9fSRussell King if (pfn < bank_pfn_start(bank)) 365b7cfda9fSRussell King right = mid; 366b7cfda9fSRussell King else if (pfn >= bank_pfn_end(bank)) 367b7cfda9fSRussell King left = mid + 1; 368b7cfda9fSRussell King else 369b7cfda9fSRussell King return 1; 370b7cfda9fSRussell King } while (left < right); 371b7cfda9fSRussell King return 0; 372b7cfda9fSRussell King } 373b7cfda9fSRussell King EXPORT_SYMBOL(pfn_valid); 374657e12fdSRussell King 375657e12fdSRussell King static void arm_memory_present(struct meminfo *mi, int node) 376657e12fdSRussell King { 377657e12fdSRussell King } 378657e12fdSRussell King #else 379657e12fdSRussell King static void arm_memory_present(struct meminfo *mi, int node) 380657e12fdSRussell King { 381657e12fdSRussell King int i; 382657e12fdSRussell King for_each_nodebank(i, mi, node) { 383657e12fdSRussell King struct membank *bank = &mi->bank[i]; 384657e12fdSRussell King memory_present(node, bank_pfn_start(bank), bank_pfn_end(bank)); 385657e12fdSRussell King } 386657e12fdSRussell King } 387b7cfda9fSRussell King #endif 388b7cfda9fSRussell King 389b7cfda9fSRussell King static int __init meminfo_cmp(const void *_a, const void *_b) 390b7cfda9fSRussell King { 391b7cfda9fSRussell King const struct membank *a = _a, *b = _b; 392b7cfda9fSRussell King long cmp = bank_pfn_start(a) - bank_pfn_start(b); 393b7cfda9fSRussell King return cmp < 0 ? -1 : cmp > 0 ? 1 : 0; 394b7cfda9fSRussell King } 395b7cfda9fSRussell King 3964b5f32ceSNicolas Pitre void __init bootmem_init(void) 39790072059SRussell King { 3984b5f32ceSNicolas Pitre struct meminfo *mi = &meminfo; 399dde5828fSRussell King unsigned long min, max_low, max_high; 400eca73214SRussell King int node, initrd_node; 40190072059SRussell King 402b7cfda9fSRussell King sort(&mi->bank, mi->nr_banks, sizeof(mi->bank[0]), meminfo_cmp, NULL); 403b7cfda9fSRussell King 40490072059SRussell King /* 40590072059SRussell King * Locate which node contains the ramdisk image, if any. 40690072059SRussell King */ 40790072059SRussell King initrd_node = check_initrd(mi); 40890072059SRussell King 409dde5828fSRussell King max_low = max_high = 0; 410dde5828fSRussell King 41190072059SRussell King /* 41290072059SRussell King * Run through each node initialising the bootmem allocator. 41390072059SRussell King */ 41490072059SRussell King for_each_node(node) { 415dde5828fSRussell King unsigned long node_low, node_high; 416dde5828fSRussell King 417dde5828fSRussell King find_node_limits(node, mi, &min, &node_low, &node_high); 418dde5828fSRussell King 419dde5828fSRussell King if (node_low > max_low) 420dde5828fSRussell King max_low = node_low; 421dde5828fSRussell King if (node_high > max_high) 422dde5828fSRussell King max_high = node_high; 423dde5828fSRussell King 424dde5828fSRussell King /* 425dde5828fSRussell King * If there is no memory in this node, ignore it. 426dde5828fSRussell King * (We can't have nodes which have no lowmem) 427dde5828fSRussell King */ 428dde5828fSRussell King if (node_low == 0) 429dde5828fSRussell King continue; 430dde5828fSRussell King 431dde5828fSRussell King bootmem_init_node(node, mi, min, node_low); 43290072059SRussell King 433b7a69ac3SRussell King /* 434b7a69ac3SRussell King * Reserve any special node zero regions. 435b7a69ac3SRussell King */ 436b7a69ac3SRussell King if (node == 0) 437b7a69ac3SRussell King reserve_node_zero(NODE_DATA(node)); 438b7a69ac3SRussell King 439b7a69ac3SRussell King /* 440b7a69ac3SRussell King * If the initrd is in this node, reserve its memory. 441b7a69ac3SRussell King */ 442b7a69ac3SRussell King if (node == initrd_node) 443b7a69ac3SRussell King bootmem_reserve_initrd(node); 444657e12fdSRussell King 445657e12fdSRussell King /* 446657e12fdSRussell King * Sparsemem tries to allocate bootmem in memory_present(), 447657e12fdSRussell King * so must be done after the fixed reservations 448657e12fdSRussell King */ 449657e12fdSRussell King arm_memory_present(mi, node); 45090072059SRussell King } 45190072059SRussell King 452b7a69ac3SRussell King /* 453b7a69ac3SRussell King * sparse_init() needs the bootmem allocator up and running. 454b7a69ac3SRussell King */ 455b7a69ac3SRussell King sparse_init(); 456b7a69ac3SRussell King 457b7a69ac3SRussell King /* 458b7a69ac3SRussell King * Now free memory in each node - free_area_init_node needs 459b7a69ac3SRussell King * the sparse mem_map arrays initialized by sparse_init() 460b7a69ac3SRussell King * for memmap_init_zone(), otherwise all PFNs are invalid. 461b7a69ac3SRussell King */ 462b7a69ac3SRussell King for_each_node(node) 463b7a69ac3SRussell King bootmem_free_node(node, mi); 464b7a69ac3SRussell King 465dde5828fSRussell King high_memory = __va((max_low << PAGE_SHIFT) - 1) + 1; 46690072059SRussell King 46790072059SRussell King /* 46890072059SRussell King * This doesn't seem to be used by the Linux memory manager any 46990072059SRussell King * more, but is used by ll_rw_block. If we can get rid of it, we 47090072059SRussell King * also get rid of some of the stuff above as well. 47190072059SRussell King * 47290072059SRussell King * Note: max_low_pfn and max_pfn reflect the number of _pages_ in 47390072059SRussell King * the system, not the maximum PFN. 47490072059SRussell King */ 475dde5828fSRussell King max_low_pfn = max_low - PHYS_PFN_OFFSET; 476dde5828fSRussell King max_pfn = max_high - PHYS_PFN_OFFSET; 47790072059SRussell King } 47890072059SRussell King 4796db015e4SNicolas Pitre static inline int free_area(unsigned long pfn, unsigned long end, char *s) 4801da177e4SLinus Torvalds { 4816db015e4SNicolas Pitre unsigned int pages = 0, size = (end - pfn) << (PAGE_SHIFT - 10); 4821da177e4SLinus Torvalds 4836db015e4SNicolas Pitre for (; pfn < end; pfn++) { 4846db015e4SNicolas Pitre struct page *page = pfn_to_page(pfn); 4851da177e4SLinus Torvalds ClearPageReserved(page); 4867835e98bSNick Piggin init_page_count(page); 4876db015e4SNicolas Pitre __free_page(page); 4886db015e4SNicolas Pitre pages++; 4891da177e4SLinus Torvalds } 4901da177e4SLinus Torvalds 4911da177e4SLinus Torvalds if (size && s) 4921da177e4SLinus Torvalds printk(KERN_INFO "Freeing %s memory: %dK\n", s, size); 4936db015e4SNicolas Pitre 4946db015e4SNicolas Pitre return pages; 4951da177e4SLinus Torvalds } 4961da177e4SLinus Torvalds 497a013053dSRussell King static inline void 498a013053dSRussell King free_memmap(int node, unsigned long start_pfn, unsigned long end_pfn) 499a013053dSRussell King { 500a013053dSRussell King struct page *start_pg, *end_pg; 501a013053dSRussell King unsigned long pg, pgend; 502a013053dSRussell King 503a013053dSRussell King /* 504a013053dSRussell King * Convert start_pfn/end_pfn to a struct page pointer. 505a013053dSRussell King */ 5063257f43dSCatalin Marinas start_pg = pfn_to_page(start_pfn - 1) + 1; 507a013053dSRussell King end_pg = pfn_to_page(end_pfn); 508a013053dSRussell King 509a013053dSRussell King /* 510a013053dSRussell King * Convert to physical addresses, and 511a013053dSRussell King * round start upwards and end downwards. 512a013053dSRussell King */ 513a013053dSRussell King pg = PAGE_ALIGN(__pa(start_pg)); 514a013053dSRussell King pgend = __pa(end_pg) & PAGE_MASK; 515a013053dSRussell King 516a013053dSRussell King /* 517a013053dSRussell King * If there are free pages between these, 518a013053dSRussell King * free the section of the memmap array. 519a013053dSRussell King */ 520a013053dSRussell King if (pg < pgend) 521a013053dSRussell King free_bootmem_node(NODE_DATA(node), pg, pgend - pg); 522a013053dSRussell King } 523a013053dSRussell King 524a013053dSRussell King /* 525a013053dSRussell King * The mem_map array can get very big. Free the unused area of the memory map. 526a013053dSRussell King */ 527a013053dSRussell King static void __init free_unused_memmap_node(int node, struct meminfo *mi) 528a013053dSRussell King { 529a013053dSRussell King unsigned long bank_start, prev_bank_end = 0; 530a013053dSRussell King unsigned int i; 531a013053dSRussell King 532a013053dSRussell King /* 533a013053dSRussell King * [FIXME] This relies on each bank being in address order. This 534a013053dSRussell King * may not be the case, especially if the user has provided the 535a013053dSRussell King * information on the command line. 536a013053dSRussell King */ 53790072059SRussell King for_each_nodebank(i, mi, node) { 538d2a38ef9SRussell King struct membank *bank = &mi->bank[i]; 539d2a38ef9SRussell King 540d2a38ef9SRussell King bank_start = bank_pfn_start(bank); 541a013053dSRussell King if (bank_start < prev_bank_end) { 542a013053dSRussell King printk(KERN_ERR "MEM: unordered memory banks. " 543a013053dSRussell King "Not freeing memmap.\n"); 544a013053dSRussell King break; 545a013053dSRussell King } 546a013053dSRussell King 547a013053dSRussell King /* 548a013053dSRussell King * If we had a previous bank, and there is a space 549a013053dSRussell King * between the current bank and the previous, free it. 550a013053dSRussell King */ 551a013053dSRussell King if (prev_bank_end && prev_bank_end != bank_start) 552a013053dSRussell King free_memmap(node, prev_bank_end, bank_start); 553a013053dSRussell King 554d2a38ef9SRussell King prev_bank_end = bank_pfn_end(bank); 555a013053dSRussell King } 556a013053dSRussell King } 557a013053dSRussell King 5581da177e4SLinus Torvalds /* 5591da177e4SLinus Torvalds * mem_init() marks the free areas in the mem_map and tells us how much 5601da177e4SLinus Torvalds * memory is free. This is done after various parts of the system have 5611da177e4SLinus Torvalds * claimed their memory after the kernel image. 5621da177e4SLinus Torvalds */ 5631da177e4SLinus Torvalds void __init mem_init(void) 5641da177e4SLinus Torvalds { 5656db015e4SNicolas Pitre unsigned int codesize, datasize, initsize; 5661da177e4SLinus Torvalds int i, node; 5671da177e4SLinus Torvalds 5681da177e4SLinus Torvalds #ifndef CONFIG_DISCONTIGMEM 5693835f6cbSNicolas Pitre max_mapnr = pfn_to_page(max_pfn + PHYS_PFN_OFFSET) - mem_map; 5701da177e4SLinus Torvalds #endif 5711da177e4SLinus Torvalds 5721da177e4SLinus Torvalds /* this will put all unused low memory onto the freelists */ 5731da177e4SLinus Torvalds for_each_online_node(node) { 5741da177e4SLinus Torvalds pg_data_t *pgdat = NODE_DATA(node); 5751da177e4SLinus Torvalds 576a013053dSRussell King free_unused_memmap_node(node, &meminfo); 577a013053dSRussell King 5781da177e4SLinus Torvalds if (pgdat->node_spanned_pages != 0) 5791da177e4SLinus Torvalds totalram_pages += free_all_bootmem_node(pgdat); 5801da177e4SLinus Torvalds } 5811da177e4SLinus Torvalds 5821da177e4SLinus Torvalds #ifdef CONFIG_SA1111 5831da177e4SLinus Torvalds /* now that our DMA memory is actually so designated, we can free it */ 5846db015e4SNicolas Pitre totalram_pages += free_area(PHYS_PFN_OFFSET, 5856db015e4SNicolas Pitre __phys_to_pfn(__pa(swapper_pg_dir)), NULL); 5861da177e4SLinus Torvalds #endif 5871da177e4SLinus Torvalds 5883835f6cbSNicolas Pitre #ifdef CONFIG_HIGHMEM 5893835f6cbSNicolas Pitre /* set highmem page free */ 5903835f6cbSNicolas Pitre for_each_online_node(node) { 5913835f6cbSNicolas Pitre for_each_nodebank (i, &meminfo, node) { 5923835f6cbSNicolas Pitre unsigned long start = bank_pfn_start(&meminfo.bank[i]); 5933835f6cbSNicolas Pitre unsigned long end = bank_pfn_end(&meminfo.bank[i]); 5943835f6cbSNicolas Pitre if (start >= max_low_pfn + PHYS_PFN_OFFSET) 5953835f6cbSNicolas Pitre totalhigh_pages += free_area(start, end, NULL); 5963835f6cbSNicolas Pitre } 5973835f6cbSNicolas Pitre } 5983835f6cbSNicolas Pitre totalram_pages += totalhigh_pages; 5993835f6cbSNicolas Pitre #endif 6003835f6cbSNicolas Pitre 6011da177e4SLinus Torvalds /* 6021da177e4SLinus Torvalds * Since our memory may not be contiguous, calculate the 6031da177e4SLinus Torvalds * real number of pages we have in this system 6041da177e4SLinus Torvalds */ 6051da177e4SLinus Torvalds printk(KERN_INFO "Memory:"); 6061da177e4SLinus Torvalds num_physpages = 0; 6071da177e4SLinus Torvalds for (i = 0; i < meminfo.nr_banks; i++) { 608d2a38ef9SRussell King num_physpages += bank_pfn_size(&meminfo.bank[i]); 609d2a38ef9SRussell King printk(" %ldMB", bank_phys_size(&meminfo.bank[i]) >> 20); 6101da177e4SLinus Torvalds } 6111da177e4SLinus Torvalds printk(" = %luMB total\n", num_physpages >> (20 - PAGE_SHIFT)); 6126db015e4SNicolas Pitre 61337efe642SRussell King codesize = _etext - _text; 61437efe642SRussell King datasize = _end - _data; 61537efe642SRussell King initsize = __init_end - __init_begin; 6166db015e4SNicolas Pitre 6171da177e4SLinus Torvalds printk(KERN_NOTICE "Memory: %luKB available (%dK code, " 6183835f6cbSNicolas Pitre "%dK data, %dK init, %luK highmem)\n", 619cc013a88SGeert Uytterhoeven nr_free_pages() << (PAGE_SHIFT-10), codesize >> 10, 620cc013a88SGeert Uytterhoeven datasize >> 10, initsize >> 10, 6214b529401SAndreas Fenkart totalhigh_pages << (PAGE_SHIFT-10)); 6221da177e4SLinus Torvalds 6231da177e4SLinus Torvalds if (PAGE_SIZE >= 16384 && num_physpages <= 128) { 6241da177e4SLinus Torvalds extern int sysctl_overcommit_memory; 6251da177e4SLinus Torvalds /* 6261da177e4SLinus Torvalds * On a machine this small we won't get 6271da177e4SLinus Torvalds * anywhere without overcommit, so turn 6281da177e4SLinus Torvalds * it on by default. 6291da177e4SLinus Torvalds */ 6301da177e4SLinus Torvalds sysctl_overcommit_memory = OVERCOMMIT_ALWAYS; 6311da177e4SLinus Torvalds } 6321da177e4SLinus Torvalds } 6331da177e4SLinus Torvalds 6341da177e4SLinus Torvalds void free_initmem(void) 6351da177e4SLinus Torvalds { 636bc581770SLinus Walleij #ifdef CONFIG_HAVE_TCM 637bc581770SLinus Walleij extern char *__tcm_start, *__tcm_end; 638bc581770SLinus Walleij 639bc581770SLinus Walleij totalram_pages += free_area(__phys_to_pfn(__pa(__tcm_start)), 640bc581770SLinus Walleij __phys_to_pfn(__pa(__tcm_end)), 641bc581770SLinus Walleij "TCM link"); 642bc581770SLinus Walleij #endif 643bc581770SLinus Walleij 6446db015e4SNicolas Pitre if (!machine_is_integrator() && !machine_is_cintegrator()) 64537efe642SRussell King totalram_pages += free_area(__phys_to_pfn(__pa(__init_begin)), 64637efe642SRussell King __phys_to_pfn(__pa(__init_end)), 6471da177e4SLinus Torvalds "init"); 6481da177e4SLinus Torvalds } 6491da177e4SLinus Torvalds 6501da177e4SLinus Torvalds #ifdef CONFIG_BLK_DEV_INITRD 6511da177e4SLinus Torvalds 6521da177e4SLinus Torvalds static int keep_initrd; 6531da177e4SLinus Torvalds 6541da177e4SLinus Torvalds void free_initrd_mem(unsigned long start, unsigned long end) 6551da177e4SLinus Torvalds { 6561da177e4SLinus Torvalds if (!keep_initrd) 6576db015e4SNicolas Pitre totalram_pages += free_area(__phys_to_pfn(__pa(start)), 6586db015e4SNicolas Pitre __phys_to_pfn(__pa(end)), 6596db015e4SNicolas Pitre "initrd"); 6601da177e4SLinus Torvalds } 6611da177e4SLinus Torvalds 6621da177e4SLinus Torvalds static int __init keepinitrd_setup(char *__unused) 6631da177e4SLinus Torvalds { 6641da177e4SLinus Torvalds keep_initrd = 1; 6651da177e4SLinus Torvalds return 1; 6661da177e4SLinus Torvalds } 6671da177e4SLinus Torvalds 6681da177e4SLinus Torvalds __setup("keepinitrd", keepinitrd_setup); 6691da177e4SLinus Torvalds #endif 670