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> 189eb8f674SGrant Likely #include <linux/of_fdt.h> 193835f6cbSNicolas Pitre #include <linux/highmem.h> 205a0e3ad6STejun Heo #include <linux/gfp.h> 212778f620SRussell King #include <linux/memblock.h> 227dc50ec7SRussell King #include <linux/sort.h> 231da177e4SLinus Torvalds 241da177e4SLinus Torvalds #include <asm/mach-types.h> 2593c02ab4SGrant Likely #include <asm/prom.h> 2637efe642SRussell King #include <asm/sections.h> 271da177e4SLinus Torvalds #include <asm/setup.h> 2874d02fb9SRussell King #include <asm/sizes.h> 291da177e4SLinus Torvalds #include <asm/tlb.h> 30db9ef1afSFenkart/Bostandzhyan #include <asm/fixmap.h> 311da177e4SLinus Torvalds 321da177e4SLinus Torvalds #include <asm/mach/arch.h> 331da177e4SLinus Torvalds #include <asm/mach/map.h> 341da177e4SLinus Torvalds 351b2e2b73SRussell King #include "mm.h" 361b2e2b73SRussell King 37012d1f4aSRussell King static unsigned long phys_initrd_start __initdata = 0; 38012d1f4aSRussell King static unsigned long phys_initrd_size __initdata = 0; 39012d1f4aSRussell King 402b0d8c25SJeremy Kerr static int __init early_initrd(char *p) 41012d1f4aSRussell King { 42012d1f4aSRussell King unsigned long start, size; 432b0d8c25SJeremy Kerr char *endp; 44012d1f4aSRussell King 452b0d8c25SJeremy Kerr start = memparse(p, &endp); 462b0d8c25SJeremy Kerr if (*endp == ',') { 472b0d8c25SJeremy Kerr size = memparse(endp + 1, NULL); 48012d1f4aSRussell King 49012d1f4aSRussell King phys_initrd_start = start; 50012d1f4aSRussell King phys_initrd_size = size; 51012d1f4aSRussell King } 522b0d8c25SJeremy Kerr return 0; 53012d1f4aSRussell King } 542b0d8c25SJeremy Kerr early_param("initrd", early_initrd); 55012d1f4aSRussell King 56012d1f4aSRussell King static int __init parse_tag_initrd(const struct tag *tag) 57012d1f4aSRussell King { 58012d1f4aSRussell King printk(KERN_WARNING "ATAG_INITRD is deprecated; " 59012d1f4aSRussell King "please update your bootloader.\n"); 60012d1f4aSRussell King phys_initrd_start = __virt_to_phys(tag->u.initrd.start); 61012d1f4aSRussell King phys_initrd_size = tag->u.initrd.size; 62012d1f4aSRussell King return 0; 63012d1f4aSRussell King } 64012d1f4aSRussell King 65012d1f4aSRussell King __tagtable(ATAG_INITRD, parse_tag_initrd); 66012d1f4aSRussell King 67012d1f4aSRussell King static int __init parse_tag_initrd2(const struct tag *tag) 68012d1f4aSRussell King { 69012d1f4aSRussell King phys_initrd_start = tag->u.initrd.start; 70012d1f4aSRussell King phys_initrd_size = tag->u.initrd.size; 71012d1f4aSRussell King return 0; 72012d1f4aSRussell King } 73012d1f4aSRussell King 74012d1f4aSRussell King __tagtable(ATAG_INITRD2, parse_tag_initrd2); 751da177e4SLinus Torvalds 769eb8f674SGrant Likely #ifdef CONFIG_OF_FLATTREE 779eb8f674SGrant Likely void __init early_init_dt_setup_initrd_arch(unsigned long start, unsigned long end) 789eb8f674SGrant Likely { 799eb8f674SGrant Likely phys_initrd_start = start; 809eb8f674SGrant Likely phys_initrd_size = end - start; 819eb8f674SGrant Likely } 829eb8f674SGrant Likely #endif /* CONFIG_OF_FLATTREE */ 839eb8f674SGrant Likely 841da177e4SLinus Torvalds /* 854b5f32ceSNicolas Pitre * This keeps memory configuration data used by a couple memory 864b5f32ceSNicolas Pitre * initialization functions, as well as show_mem() for the skipping 874b5f32ceSNicolas Pitre * of holes in the memory map. It is populated by arm_add_memory(). 881da177e4SLinus Torvalds */ 894b5f32ceSNicolas Pitre struct meminfo meminfo; 905e709827SRay Lehtiniemi 91b2b755b5SDavid Rientjes void show_mem(unsigned int filter) 921da177e4SLinus Torvalds { 931da177e4SLinus Torvalds int free = 0, total = 0, reserved = 0; 94be370302SRussell King int shared = 0, cached = 0, slab = 0, i; 955e709827SRay Lehtiniemi struct meminfo * mi = &meminfo; 961da177e4SLinus Torvalds 971da177e4SLinus Torvalds printk("Mem-info:\n"); 981da177e4SLinus Torvalds show_free_areas(); 99be370302SRussell King 100be370302SRussell King for_each_bank (i, mi) { 101d2a38ef9SRussell King struct membank *bank = &mi->bank[i]; 1025e709827SRay Lehtiniemi unsigned int pfn1, pfn2; 1031da177e4SLinus Torvalds struct page *page, *end; 1041da177e4SLinus Torvalds 105d2a38ef9SRussell King pfn1 = bank_pfn_start(bank); 106d2a38ef9SRussell King pfn2 = bank_pfn_end(bank); 1075e709827SRay Lehtiniemi 108ea056df7SCatalin Marinas page = pfn_to_page(pfn1); 109ea056df7SCatalin Marinas end = pfn_to_page(pfn2 - 1) + 1; 1101da177e4SLinus Torvalds 1111da177e4SLinus Torvalds do { 1121da177e4SLinus Torvalds total++; 1131da177e4SLinus Torvalds if (PageReserved(page)) 1141da177e4SLinus Torvalds reserved++; 1151da177e4SLinus Torvalds else if (PageSwapCache(page)) 1161da177e4SLinus Torvalds cached++; 1171da177e4SLinus Torvalds else if (PageSlab(page)) 1181da177e4SLinus Torvalds slab++; 1191da177e4SLinus Torvalds else if (!page_count(page)) 1201da177e4SLinus Torvalds free++; 1211da177e4SLinus Torvalds else 1221da177e4SLinus Torvalds shared += page_count(page) - 1; 1231da177e4SLinus Torvalds page++; 1241da177e4SLinus Torvalds } while (page < end); 1251da177e4SLinus Torvalds } 1261da177e4SLinus Torvalds 1271da177e4SLinus Torvalds printk("%d pages of RAM\n", total); 1281da177e4SLinus Torvalds printk("%d free pages\n", free); 1291da177e4SLinus Torvalds printk("%d reserved pages\n", reserved); 1301da177e4SLinus Torvalds printk("%d slab pages\n", slab); 1311da177e4SLinus Torvalds printk("%d pages shared\n", shared); 1321da177e4SLinus Torvalds printk("%d pages swap cached\n", cached); 1331da177e4SLinus Torvalds } 1341da177e4SLinus Torvalds 135f25b4b4cSRussell King static void __init find_limits(unsigned long *min, unsigned long *max_low, 136f25b4b4cSRussell King unsigned long *max_high) 137dde5828fSRussell King { 138f25b4b4cSRussell King struct meminfo *mi = &meminfo; 139dde5828fSRussell King int i; 140dde5828fSRussell King 141dde5828fSRussell King *min = -1UL; 142dde5828fSRussell King *max_low = *max_high = 0; 143dde5828fSRussell King 144be370302SRussell King for_each_bank (i, mi) { 145dde5828fSRussell King struct membank *bank = &mi->bank[i]; 146dde5828fSRussell King unsigned long start, end; 147dde5828fSRussell King 148dde5828fSRussell King start = bank_pfn_start(bank); 149dde5828fSRussell King end = bank_pfn_end(bank); 150dde5828fSRussell King 151dde5828fSRussell King if (*min > start) 152dde5828fSRussell King *min = start; 153dde5828fSRussell King if (*max_high < end) 154dde5828fSRussell King *max_high = end; 155dde5828fSRussell King if (bank->highmem) 156dde5828fSRussell King continue; 157dde5828fSRussell King if (*max_low < end) 158dde5828fSRussell King *max_low = end; 159dde5828fSRussell King } 160dde5828fSRussell King } 161dde5828fSRussell King 162a801d276SRussell King static void __init arm_bootmem_init(unsigned long start_pfn, 163a801d276SRussell King unsigned long end_pfn) 1641da177e4SLinus Torvalds { 165719c1514SBenjamin Herrenschmidt struct memblock_region *reg; 16690072059SRussell King unsigned int boot_pages; 1672778f620SRussell King phys_addr_t bitmap; 16890072059SRussell King pg_data_t *pgdat; 1691da177e4SLinus Torvalds 17090072059SRussell King /* 1712778f620SRussell King * Allocate the bootmem bitmap page. This must be in a region 1722778f620SRussell King * of memory which has already been mapped. 1731da177e4SLinus Torvalds */ 17490072059SRussell King boot_pages = bootmem_bootmap_pages(end_pfn - start_pfn); 1752778f620SRussell King bitmap = memblock_alloc_base(boot_pages << PAGE_SHIFT, L1_CACHE_BYTES, 1762778f620SRussell King __pfn_to_phys(end_pfn)); 1771da177e4SLinus Torvalds 1781da177e4SLinus Torvalds /* 179be370302SRussell King * Initialise the bootmem allocator, handing the 18090072059SRussell King * memory banks over to bootmem. 1811da177e4SLinus Torvalds */ 182be370302SRussell King node_set_online(0); 183be370302SRussell King pgdat = NODE_DATA(0); 1842778f620SRussell King init_bootmem_node(pgdat, __phys_to_pfn(bitmap), start_pfn, end_pfn); 18590072059SRussell King 186a801d276SRussell King /* Free the lowmem regions from memblock into bootmem. */ 187a801d276SRussell King for_each_memblock(memory, reg) { 188a801d276SRussell King unsigned long start = memblock_region_memory_base_pfn(reg); 189a801d276SRussell King unsigned long end = memblock_region_memory_end_pfn(reg); 190a801d276SRussell King 191a801d276SRussell King if (end >= end_pfn) 192a801d276SRussell King end = end_pfn; 193a801d276SRussell King if (start >= end) 194a801d276SRussell King break; 195a801d276SRussell King 196a801d276SRussell King free_bootmem(__pfn_to_phys(start), (end - start) << PAGE_SHIFT); 197d2a38ef9SRussell King } 1981da177e4SLinus Torvalds 199a801d276SRussell King /* Reserve the lowmem memblock reserved regions in bootmem. */ 200719c1514SBenjamin Herrenschmidt for_each_memblock(reserved, reg) { 201a801d276SRussell King unsigned long start = memblock_region_reserved_base_pfn(reg); 202a801d276SRussell King unsigned long end = memblock_region_reserved_end_pfn(reg); 203a801d276SRussell King 204a801d276SRussell King if (end >= end_pfn) 205a801d276SRussell King end = end_pfn; 206a801d276SRussell King if (start >= end) 207a801d276SRussell King break; 208a801d276SRussell King 209a801d276SRussell King reserve_bootmem(__pfn_to_phys(start), 210a801d276SRussell King (end - start) << PAGE_SHIFT, BOOTMEM_DEFAULT); 211b7a69ac3SRussell King } 212b7a69ac3SRussell King } 213b7a69ac3SRussell King 214a2c54d2aSRussell King static void __init arm_bootmem_free(unsigned long min, unsigned long max_low, 215a2c54d2aSRussell King unsigned long max_high) 216b7a69ac3SRussell King { 217b7a69ac3SRussell King unsigned long zone_size[MAX_NR_ZONES], zhole_size[MAX_NR_ZONES]; 218a2c54d2aSRussell King struct memblock_region *reg; 219b7a69ac3SRussell King 22090072059SRussell King /* 221be370302SRussell King * initialise the zones. 22290072059SRussell King */ 22390072059SRussell King memset(zone_size, 0, sizeof(zone_size)); 22490072059SRussell King 22590072059SRussell King /* 226be370302SRussell King * The memory size has already been determined. If we need 227be370302SRussell King * to do anything fancy with the allocation of this memory 228be370302SRussell King * to the zones, now is the time to do it. 22990072059SRussell King */ 230dde5828fSRussell King zone_size[0] = max_low - min; 231dde5828fSRussell King #ifdef CONFIG_HIGHMEM 232dde5828fSRussell King zone_size[ZONE_HIGHMEM] = max_high - max_low; 233dde5828fSRussell King #endif 23490072059SRussell King 23590072059SRussell King /* 236be370302SRussell King * Calculate the size of the holes. 237be370302SRussell King * holes = node_size - sum(bank_sizes) 23890072059SRussell King */ 239dde5828fSRussell King memcpy(zhole_size, zone_size, sizeof(zhole_size)); 240a2c54d2aSRussell King for_each_memblock(memory, reg) { 241a2c54d2aSRussell King unsigned long start = memblock_region_memory_base_pfn(reg); 242a2c54d2aSRussell King unsigned long end = memblock_region_memory_end_pfn(reg); 243a2c54d2aSRussell King 244a2c54d2aSRussell King if (start < max_low) { 245a2c54d2aSRussell King unsigned long low_end = min(end, max_low); 246a2c54d2aSRussell King zhole_size[0] -= low_end - start; 247a2c54d2aSRussell King } 248dde5828fSRussell King #ifdef CONFIG_HIGHMEM 249a2c54d2aSRussell King if (end > max_low) { 250a2c54d2aSRussell King unsigned long high_start = max(start, max_low); 251a2c54d2aSRussell King zhole_size[ZONE_HIGHMEM] -= end - high_start; 252a2c54d2aSRussell King } 253dde5828fSRussell King #endif 254dde5828fSRussell King } 25590072059SRussell King 25690072059SRussell King /* 25790072059SRussell King * Adjust the sizes according to any special requirements for 25890072059SRussell King * this machine type. 25990072059SRussell King */ 260b65b4781SRussell King arch_adjust_zones(zone_size, zhole_size); 26190072059SRussell King 262be370302SRussell King free_area_init_node(0, zone_size, min, zhole_size); 26390072059SRussell King } 26490072059SRussell King 265b7cfda9fSRussell King #ifndef CONFIG_SPARSEMEM 266b7cfda9fSRussell King int pfn_valid(unsigned long pfn) 267b7cfda9fSRussell King { 2685e6f6aa1SBenjamin Herrenschmidt return memblock_is_memory(pfn << PAGE_SHIFT); 269b7cfda9fSRussell King } 270b7cfda9fSRussell King EXPORT_SYMBOL(pfn_valid); 271657e12fdSRussell King 272eda2e5dcSRussell King static void arm_memory_present(void) 273657e12fdSRussell King { 274657e12fdSRussell King } 275657e12fdSRussell King #else 276eda2e5dcSRussell King static void arm_memory_present(void) 277657e12fdSRussell King { 278719c1514SBenjamin Herrenschmidt struct memblock_region *reg; 279719c1514SBenjamin Herrenschmidt 2807c996361SYinghai Lu for_each_memblock(memory, reg) 281c7fc2de0SYinghai Lu memory_present(0, memblock_region_memory_base_pfn(reg), 282c7fc2de0SYinghai Lu memblock_region_memory_end_pfn(reg)); 283657e12fdSRussell King } 284b7cfda9fSRussell King #endif 285b7cfda9fSRussell King 2867dc50ec7SRussell King static int __init meminfo_cmp(const void *_a, const void *_b) 2877dc50ec7SRussell King { 2887dc50ec7SRussell King const struct membank *a = _a, *b = _b; 2897dc50ec7SRussell King long cmp = bank_pfn_start(a) - bank_pfn_start(b); 2907dc50ec7SRussell King return cmp < 0 ? -1 : cmp > 0 ? 1 : 0; 2917dc50ec7SRussell King } 2927dc50ec7SRussell King 2938d717a52SRussell King void __init arm_memblock_init(struct meminfo *mi, struct machine_desc *mdesc) 2942778f620SRussell King { 2952778f620SRussell King int i; 2962778f620SRussell King 2977dc50ec7SRussell King sort(&meminfo.bank, meminfo.nr_banks, sizeof(meminfo.bank[0]), meminfo_cmp, NULL); 2987dc50ec7SRussell King 2992778f620SRussell King memblock_init(); 3002778f620SRussell King for (i = 0; i < mi->nr_banks; i++) 3012778f620SRussell King memblock_add(mi->bank[i].start, mi->bank[i].size); 3022778f620SRussell King 3032778f620SRussell King /* Register the kernel text, kernel data and initrd with memblock. */ 3042778f620SRussell King #ifdef CONFIG_XIP_KERNEL 305842eab40SRussell King memblock_reserve(__pa(_sdata), _end - _sdata); 3062778f620SRussell King #else 3072778f620SRussell King memblock_reserve(__pa(_stext), _end - _stext); 3082778f620SRussell King #endif 3092778f620SRussell King #ifdef CONFIG_BLK_DEV_INITRD 310b0a2679dSRussell King if (phys_initrd_size && 311b0a2679dSRussell King memblock_is_region_reserved(phys_initrd_start, phys_initrd_size)) { 312b0a2679dSRussell King pr_err("INITRD: 0x%08lx+0x%08lx overlaps in-use memory region - disabling initrd\n", 313b0a2679dSRussell King phys_initrd_start, phys_initrd_size); 314b0a2679dSRussell King phys_initrd_start = phys_initrd_size = 0; 315b0a2679dSRussell King } 3162778f620SRussell King if (phys_initrd_size) { 3172778f620SRussell King memblock_reserve(phys_initrd_start, phys_initrd_size); 3182778f620SRussell King 3192778f620SRussell King /* Now convert initrd to virtual addresses */ 3202778f620SRussell King initrd_start = __phys_to_virt(phys_initrd_start); 3212778f620SRussell King initrd_end = initrd_start + phys_initrd_size; 3222778f620SRussell King } 3232778f620SRussell King #endif 3242778f620SRussell King 3252778f620SRussell King arm_mm_memblock_reserve(); 32693c02ab4SGrant Likely arm_dt_memblock_reserve(); 3272778f620SRussell King 3288d717a52SRussell King /* reserve any platform specific memblock areas */ 3298d717a52SRussell King if (mdesc->reserve) 3308d717a52SRussell King mdesc->reserve(); 3318d717a52SRussell King 3322778f620SRussell King memblock_analyze(); 3332778f620SRussell King memblock_dump_all(); 3342778f620SRussell King } 3352778f620SRussell King 3368d717a52SRussell King void __init bootmem_init(void) 33790072059SRussell King { 338dde5828fSRussell King unsigned long min, max_low, max_high; 33990072059SRussell King 340dde5828fSRussell King max_low = max_high = 0; 341dde5828fSRussell King 342f25b4b4cSRussell King find_limits(&min, &max_low, &max_high); 343dde5828fSRussell King 344a801d276SRussell King arm_bootmem_init(min, max_low); 345dde5828fSRussell King 346b7a69ac3SRussell King /* 347657e12fdSRussell King * Sparsemem tries to allocate bootmem in memory_present(), 348657e12fdSRussell King * so must be done after the fixed reservations 349657e12fdSRussell King */ 350eda2e5dcSRussell King arm_memory_present(); 35190072059SRussell King 352b7a69ac3SRussell King /* 353b7a69ac3SRussell King * sparse_init() needs the bootmem allocator up and running. 354b7a69ac3SRussell King */ 355b7a69ac3SRussell King sparse_init(); 356b7a69ac3SRussell King 357b7a69ac3SRussell King /* 358be370302SRussell King * Now free the memory - free_area_init_node needs 359b7a69ac3SRussell King * the sparse mem_map arrays initialized by sparse_init() 360b7a69ac3SRussell King * for memmap_init_zone(), otherwise all PFNs are invalid. 361b7a69ac3SRussell King */ 362a2c54d2aSRussell King arm_bootmem_free(min, max_low, max_high); 363b7a69ac3SRussell King 364cae6292bSWill Deacon high_memory = __va(((phys_addr_t)max_low << PAGE_SHIFT) - 1) + 1; 36590072059SRussell King 36690072059SRussell King /* 36790072059SRussell King * This doesn't seem to be used by the Linux memory manager any 36890072059SRussell King * more, but is used by ll_rw_block. If we can get rid of it, we 36990072059SRussell King * also get rid of some of the stuff above as well. 37090072059SRussell King * 37190072059SRussell King * Note: max_low_pfn and max_pfn reflect the number of _pages_ in 37290072059SRussell King * the system, not the maximum PFN. 37390072059SRussell King */ 374dde5828fSRussell King max_low_pfn = max_low - PHYS_PFN_OFFSET; 375dde5828fSRussell King max_pfn = max_high - PHYS_PFN_OFFSET; 37690072059SRussell King } 37790072059SRussell King 3786db015e4SNicolas Pitre static inline int free_area(unsigned long pfn, unsigned long end, char *s) 3791da177e4SLinus Torvalds { 3806db015e4SNicolas Pitre unsigned int pages = 0, size = (end - pfn) << (PAGE_SHIFT - 10); 3811da177e4SLinus Torvalds 3826db015e4SNicolas Pitre for (; pfn < end; pfn++) { 3836db015e4SNicolas Pitre struct page *page = pfn_to_page(pfn); 3841da177e4SLinus Torvalds ClearPageReserved(page); 3857835e98bSNick Piggin init_page_count(page); 3866db015e4SNicolas Pitre __free_page(page); 3876db015e4SNicolas Pitre pages++; 3881da177e4SLinus Torvalds } 3891da177e4SLinus Torvalds 3901da177e4SLinus Torvalds if (size && s) 3911da177e4SLinus Torvalds printk(KERN_INFO "Freeing %s memory: %dK\n", s, size); 3926db015e4SNicolas Pitre 3936db015e4SNicolas Pitre return pages; 3941da177e4SLinus Torvalds } 3951da177e4SLinus Torvalds 396a013053dSRussell King static inline void 397be370302SRussell King free_memmap(unsigned long start_pfn, unsigned long end_pfn) 398a013053dSRussell King { 399a013053dSRussell King struct page *start_pg, *end_pg; 400a013053dSRussell King unsigned long pg, pgend; 401a013053dSRussell King 402a013053dSRussell King /* 403a013053dSRussell King * Convert start_pfn/end_pfn to a struct page pointer. 404a013053dSRussell King */ 4053257f43dSCatalin Marinas start_pg = pfn_to_page(start_pfn - 1) + 1; 406a013053dSRussell King end_pg = pfn_to_page(end_pfn); 407a013053dSRussell King 408a013053dSRussell King /* 409a013053dSRussell King * Convert to physical addresses, and 410a013053dSRussell King * round start upwards and end downwards. 411a013053dSRussell King */ 412cae6292bSWill Deacon pg = (unsigned long)PAGE_ALIGN(__pa(start_pg)); 413cae6292bSWill Deacon pgend = (unsigned long)__pa(end_pg) & PAGE_MASK; 414a013053dSRussell King 415a013053dSRussell King /* 416a013053dSRussell King * If there are free pages between these, 417a013053dSRussell King * free the section of the memmap array. 418a013053dSRussell King */ 419a013053dSRussell King if (pg < pgend) 420be370302SRussell King free_bootmem(pg, pgend - pg); 421a013053dSRussell King } 422a013053dSRussell King 423a013053dSRussell King /* 424a013053dSRussell King * The mem_map array can get very big. Free the unused area of the memory map. 425a013053dSRussell King */ 426be370302SRussell King static void __init free_unused_memmap(struct meminfo *mi) 427a013053dSRussell King { 428a013053dSRussell King unsigned long bank_start, prev_bank_end = 0; 429a013053dSRussell King unsigned int i; 430a013053dSRussell King 431a013053dSRussell King /* 4323260e529SMichael Bohan * This relies on each bank being in address order. 4333260e529SMichael Bohan * The banks are sorted previously in bootmem_init(). 434a013053dSRussell King */ 435be370302SRussell King for_each_bank(i, mi) { 436d2a38ef9SRussell King struct membank *bank = &mi->bank[i]; 437d2a38ef9SRussell King 438d2a38ef9SRussell King bank_start = bank_pfn_start(bank); 439a013053dSRussell King 440a013053dSRussell King /* 441a013053dSRussell King * If we had a previous bank, and there is a space 442a013053dSRussell King * between the current bank and the previous, free it. 443a013053dSRussell King */ 4443260e529SMichael Bohan if (prev_bank_end && prev_bank_end < bank_start) 445be370302SRussell King free_memmap(prev_bank_end, bank_start); 446a013053dSRussell King 4473260e529SMichael Bohan /* 4483260e529SMichael Bohan * Align up here since the VM subsystem insists that the 4493260e529SMichael Bohan * memmap entries are valid from the bank end aligned to 4503260e529SMichael Bohan * MAX_ORDER_NR_PAGES. 4513260e529SMichael Bohan */ 4523260e529SMichael Bohan prev_bank_end = ALIGN(bank_pfn_end(bank), MAX_ORDER_NR_PAGES); 453a013053dSRussell King } 454a013053dSRussell King } 455a013053dSRussell King 456d0e775afSRussell King static void __init free_highpages(void) 457d0e775afSRussell King { 458d0e775afSRussell King #ifdef CONFIG_HIGHMEM 459df4f14c7SRussell King unsigned long max_low = max_low_pfn + PHYS_PFN_OFFSET; 460df4f14c7SRussell King struct memblock_region *mem, *res; 461d0e775afSRussell King 462d0e775afSRussell King /* set highmem page free */ 463df4f14c7SRussell King for_each_memblock(memory, mem) { 464df4f14c7SRussell King unsigned long start = memblock_region_memory_base_pfn(mem); 465df4f14c7SRussell King unsigned long end = memblock_region_memory_end_pfn(mem); 466df4f14c7SRussell King 467df4f14c7SRussell King /* Ignore complete lowmem entries */ 468df4f14c7SRussell King if (end <= max_low) 469df4f14c7SRussell King continue; 470df4f14c7SRussell King 471df4f14c7SRussell King /* Truncate partial highmem entries */ 472df4f14c7SRussell King if (start < max_low) 473df4f14c7SRussell King start = max_low; 474df4f14c7SRussell King 475df4f14c7SRussell King /* Find and exclude any reserved regions */ 476df4f14c7SRussell King for_each_memblock(reserved, res) { 477df4f14c7SRussell King unsigned long res_start, res_end; 478df4f14c7SRussell King 479df4f14c7SRussell King res_start = memblock_region_reserved_base_pfn(res); 480df4f14c7SRussell King res_end = memblock_region_reserved_end_pfn(res); 481df4f14c7SRussell King 482df4f14c7SRussell King if (res_end < start) 483df4f14c7SRussell King continue; 484df4f14c7SRussell King if (res_start < start) 485df4f14c7SRussell King res_start = start; 486df4f14c7SRussell King if (res_start > end) 487df4f14c7SRussell King res_start = end; 488df4f14c7SRussell King if (res_end > end) 489df4f14c7SRussell King res_end = end; 490df4f14c7SRussell King if (res_start != start) 491df4f14c7SRussell King totalhigh_pages += free_area(start, res_start, 492df4f14c7SRussell King NULL); 493df4f14c7SRussell King start = res_end; 494df4f14c7SRussell King if (start == end) 495df4f14c7SRussell King break; 496df4f14c7SRussell King } 497df4f14c7SRussell King 498df4f14c7SRussell King /* And now free anything which remains */ 499df4f14c7SRussell King if (start < end) 500d0e775afSRussell King totalhigh_pages += free_area(start, end, NULL); 501d0e775afSRussell King } 502d0e775afSRussell King totalram_pages += totalhigh_pages; 503d0e775afSRussell King #endif 504d0e775afSRussell King } 505d0e775afSRussell 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 { 513db9ef1afSFenkart/Bostandzhyan unsigned long reserved_pages, free_pages; 51447ea3c15SRussell King struct memblock_region *reg; 515be370302SRussell King int i; 5161dbd30e9SLinus Walleij #ifdef CONFIG_HAVE_TCM 5171dbd30e9SLinus Walleij /* These pointers are filled in on TCM detection */ 5181dbd30e9SLinus Walleij extern u32 dtcm_end; 5191dbd30e9SLinus Walleij extern u32 itcm_end; 5201dbd30e9SLinus Walleij #endif 5211da177e4SLinus Torvalds 5223835f6cbSNicolas Pitre max_mapnr = pfn_to_page(max_pfn + PHYS_PFN_OFFSET) - mem_map; 5231da177e4SLinus Torvalds 5241da177e4SLinus Torvalds /* this will put all unused low memory onto the freelists */ 525be370302SRussell King free_unused_memmap(&meminfo); 5261da177e4SLinus Torvalds 527be370302SRussell King totalram_pages += free_all_bootmem(); 5281da177e4SLinus Torvalds 5291da177e4SLinus Torvalds #ifdef CONFIG_SA1111 5301da177e4SLinus Torvalds /* now that our DMA memory is actually so designated, we can free it */ 5316db015e4SNicolas Pitre totalram_pages += free_area(PHYS_PFN_OFFSET, 5326db015e4SNicolas Pitre __phys_to_pfn(__pa(swapper_pg_dir)), NULL); 5331da177e4SLinus Torvalds #endif 5341da177e4SLinus Torvalds 535d0e775afSRussell King free_highpages(); 5363835f6cbSNicolas Pitre 537db9ef1afSFenkart/Bostandzhyan reserved_pages = free_pages = 0; 538db9ef1afSFenkart/Bostandzhyan 539be370302SRussell King for_each_bank(i, &meminfo) { 540db9ef1afSFenkart/Bostandzhyan struct membank *bank = &meminfo.bank[i]; 541db9ef1afSFenkart/Bostandzhyan unsigned int pfn1, pfn2; 542db9ef1afSFenkart/Bostandzhyan struct page *page, *end; 543db9ef1afSFenkart/Bostandzhyan 544db9ef1afSFenkart/Bostandzhyan pfn1 = bank_pfn_start(bank); 545db9ef1afSFenkart/Bostandzhyan pfn2 = bank_pfn_end(bank); 546db9ef1afSFenkart/Bostandzhyan 547ea056df7SCatalin Marinas page = pfn_to_page(pfn1); 548ea056df7SCatalin Marinas end = pfn_to_page(pfn2 - 1) + 1; 549db9ef1afSFenkart/Bostandzhyan 550db9ef1afSFenkart/Bostandzhyan do { 551db9ef1afSFenkart/Bostandzhyan if (PageReserved(page)) 552db9ef1afSFenkart/Bostandzhyan reserved_pages++; 553db9ef1afSFenkart/Bostandzhyan else if (!page_count(page)) 554db9ef1afSFenkart/Bostandzhyan free_pages++; 555db9ef1afSFenkart/Bostandzhyan page++; 556db9ef1afSFenkart/Bostandzhyan } while (page < end); 557db9ef1afSFenkart/Bostandzhyan } 558db9ef1afSFenkart/Bostandzhyan 5591da177e4SLinus Torvalds /* 5601da177e4SLinus Torvalds * Since our memory may not be contiguous, calculate the 5611da177e4SLinus Torvalds * real number of pages we have in this system 5621da177e4SLinus Torvalds */ 5631da177e4SLinus Torvalds printk(KERN_INFO "Memory:"); 5641da177e4SLinus Torvalds num_physpages = 0; 56547ea3c15SRussell King for_each_memblock(memory, reg) { 56647ea3c15SRussell King unsigned long pages = memblock_region_memory_end_pfn(reg) - 56747ea3c15SRussell King memblock_region_memory_base_pfn(reg); 56847ea3c15SRussell King num_physpages += pages; 56947ea3c15SRussell King printk(" %ldMB", pages >> (20 - PAGE_SHIFT)); 5701da177e4SLinus Torvalds } 5711da177e4SLinus Torvalds printk(" = %luMB total\n", num_physpages >> (20 - PAGE_SHIFT)); 5726db015e4SNicolas Pitre 573db9ef1afSFenkart/Bostandzhyan printk(KERN_NOTICE "Memory: %luk/%luk available, %luk reserved, %luK highmem\n", 574db9ef1afSFenkart/Bostandzhyan nr_free_pages() << (PAGE_SHIFT-10), 575db9ef1afSFenkart/Bostandzhyan free_pages << (PAGE_SHIFT-10), 576db9ef1afSFenkart/Bostandzhyan reserved_pages << (PAGE_SHIFT-10), 5774b529401SAndreas Fenkart totalhigh_pages << (PAGE_SHIFT-10)); 5781da177e4SLinus Torvalds 579db9ef1afSFenkart/Bostandzhyan #define MLK(b, t) b, t, ((t) - (b)) >> 10 580db9ef1afSFenkart/Bostandzhyan #define MLM(b, t) b, t, ((t) - (b)) >> 20 581db9ef1afSFenkart/Bostandzhyan #define MLK_ROUNDUP(b, t) b, t, DIV_ROUND_UP(((t) - (b)), SZ_1K) 582db9ef1afSFenkart/Bostandzhyan 583db9ef1afSFenkart/Bostandzhyan printk(KERN_NOTICE "Virtual kernel memory layout:\n" 584db9ef1afSFenkart/Bostandzhyan " vector : 0x%08lx - 0x%08lx (%4ld kB)\n" 58507d2a5c7SLinus Walleij #ifdef CONFIG_HAVE_TCM 58607d2a5c7SLinus Walleij " DTCM : 0x%08lx - 0x%08lx (%4ld kB)\n" 58707d2a5c7SLinus Walleij " ITCM : 0x%08lx - 0x%08lx (%4ld kB)\n" 58807d2a5c7SLinus Walleij #endif 589db9ef1afSFenkart/Bostandzhyan " fixmap : 0x%08lx - 0x%08lx (%4ld kB)\n" 590a7bd08c8SFenkart/Bostandzhyan #ifdef CONFIG_MMU 591a7bd08c8SFenkart/Bostandzhyan " DMA : 0x%08lx - 0x%08lx (%4ld MB)\n" 592a7bd08c8SFenkart/Bostandzhyan #endif 593db9ef1afSFenkart/Bostandzhyan " vmalloc : 0x%08lx - 0x%08lx (%4ld MB)\n" 594db9ef1afSFenkart/Bostandzhyan " lowmem : 0x%08lx - 0x%08lx (%4ld MB)\n" 595db9ef1afSFenkart/Bostandzhyan #ifdef CONFIG_HIGHMEM 596db9ef1afSFenkart/Bostandzhyan " pkmap : 0x%08lx - 0x%08lx (%4ld MB)\n" 597db9ef1afSFenkart/Bostandzhyan #endif 598db9ef1afSFenkart/Bostandzhyan " modules : 0x%08lx - 0x%08lx (%4ld MB)\n" 599db9ef1afSFenkart/Bostandzhyan " .init : 0x%p" " - 0x%p" " (%4d kB)\n" 600db9ef1afSFenkart/Bostandzhyan " .text : 0x%p" " - 0x%p" " (%4d kB)\n" 601db9ef1afSFenkart/Bostandzhyan " .data : 0x%p" " - 0x%p" " (%4d kB)\n", 602db9ef1afSFenkart/Bostandzhyan 603db9ef1afSFenkart/Bostandzhyan MLK(UL(CONFIG_VECTORS_BASE), UL(CONFIG_VECTORS_BASE) + 604db9ef1afSFenkart/Bostandzhyan (PAGE_SIZE)), 60507d2a5c7SLinus Walleij #ifdef CONFIG_HAVE_TCM 6061dbd30e9SLinus Walleij MLK(DTCM_OFFSET, (unsigned long) dtcm_end), 6071dbd30e9SLinus Walleij MLK(ITCM_OFFSET, (unsigned long) itcm_end), 60807d2a5c7SLinus Walleij #endif 609db9ef1afSFenkart/Bostandzhyan MLK(FIXADDR_START, FIXADDR_TOP), 610a7bd08c8SFenkart/Bostandzhyan #ifdef CONFIG_MMU 611a7bd08c8SFenkart/Bostandzhyan MLM(CONSISTENT_BASE, CONSISTENT_END), 612a7bd08c8SFenkart/Bostandzhyan #endif 613c931b4f6SFenkart/Bostandzhyan MLM(VMALLOC_START, VMALLOC_END), 614db9ef1afSFenkart/Bostandzhyan MLM(PAGE_OFFSET, (unsigned long)high_memory), 615db9ef1afSFenkart/Bostandzhyan #ifdef CONFIG_HIGHMEM 616db9ef1afSFenkart/Bostandzhyan MLM(PKMAP_BASE, (PKMAP_BASE) + (LAST_PKMAP) * 617db9ef1afSFenkart/Bostandzhyan (PAGE_SIZE)), 618db9ef1afSFenkart/Bostandzhyan #endif 619db9ef1afSFenkart/Bostandzhyan MLM(MODULES_VADDR, MODULES_END), 620db9ef1afSFenkart/Bostandzhyan 621db9ef1afSFenkart/Bostandzhyan MLK_ROUNDUP(__init_begin, __init_end), 622db9ef1afSFenkart/Bostandzhyan MLK_ROUNDUP(_text, _etext), 623842eab40SRussell King MLK_ROUNDUP(_sdata, _edata)); 624db9ef1afSFenkart/Bostandzhyan 625db9ef1afSFenkart/Bostandzhyan #undef MLK 626db9ef1afSFenkart/Bostandzhyan #undef MLM 627db9ef1afSFenkart/Bostandzhyan #undef MLK_ROUNDUP 628db9ef1afSFenkart/Bostandzhyan 629a1839272SFenkart/Bostandzhyan /* 630a1839272SFenkart/Bostandzhyan * Check boundaries twice: Some fundamental inconsistencies can 631a1839272SFenkart/Bostandzhyan * be detected at build time already. 632a1839272SFenkart/Bostandzhyan */ 633a1839272SFenkart/Bostandzhyan #ifdef CONFIG_MMU 634a1839272SFenkart/Bostandzhyan BUILD_BUG_ON(VMALLOC_END > CONSISTENT_BASE); 635a1839272SFenkart/Bostandzhyan BUG_ON(VMALLOC_END > CONSISTENT_BASE); 636a1839272SFenkart/Bostandzhyan 637a1839272SFenkart/Bostandzhyan BUILD_BUG_ON(TASK_SIZE > MODULES_VADDR); 638a1839272SFenkart/Bostandzhyan BUG_ON(TASK_SIZE > MODULES_VADDR); 639a1839272SFenkart/Bostandzhyan #endif 640a1839272SFenkart/Bostandzhyan 641a1839272SFenkart/Bostandzhyan #ifdef CONFIG_HIGHMEM 642a1839272SFenkart/Bostandzhyan BUILD_BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE > PAGE_OFFSET); 643a1839272SFenkart/Bostandzhyan BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE > PAGE_OFFSET); 644a1839272SFenkart/Bostandzhyan #endif 645a1839272SFenkart/Bostandzhyan 6461da177e4SLinus Torvalds if (PAGE_SIZE >= 16384 && num_physpages <= 128) { 6471da177e4SLinus Torvalds extern int sysctl_overcommit_memory; 6481da177e4SLinus Torvalds /* 6491da177e4SLinus Torvalds * On a machine this small we won't get 6501da177e4SLinus Torvalds * anywhere without overcommit, so turn 6511da177e4SLinus Torvalds * it on by default. 6521da177e4SLinus Torvalds */ 6531da177e4SLinus Torvalds sysctl_overcommit_memory = OVERCOMMIT_ALWAYS; 6541da177e4SLinus Torvalds } 6551da177e4SLinus Torvalds } 6561da177e4SLinus Torvalds 6571da177e4SLinus Torvalds void free_initmem(void) 6581da177e4SLinus Torvalds { 659bc581770SLinus Walleij #ifdef CONFIG_HAVE_TCM 660ea208f64SLinus Walleij extern char __tcm_start, __tcm_end; 661bc581770SLinus Walleij 662ea208f64SLinus Walleij totalram_pages += free_area(__phys_to_pfn(__pa(&__tcm_start)), 663ea208f64SLinus Walleij __phys_to_pfn(__pa(&__tcm_end)), 664bc581770SLinus Walleij "TCM link"); 665bc581770SLinus Walleij #endif 666bc581770SLinus Walleij 6676db015e4SNicolas Pitre if (!machine_is_integrator() && !machine_is_cintegrator()) 66837efe642SRussell King totalram_pages += free_area(__phys_to_pfn(__pa(__init_begin)), 66937efe642SRussell King __phys_to_pfn(__pa(__init_end)), 6701da177e4SLinus Torvalds "init"); 6711da177e4SLinus Torvalds } 6721da177e4SLinus Torvalds 6731da177e4SLinus Torvalds #ifdef CONFIG_BLK_DEV_INITRD 6741da177e4SLinus Torvalds 6751da177e4SLinus Torvalds static int keep_initrd; 6761da177e4SLinus Torvalds 6771da177e4SLinus Torvalds void free_initrd_mem(unsigned long start, unsigned long end) 6781da177e4SLinus Torvalds { 6791da177e4SLinus Torvalds if (!keep_initrd) 6806db015e4SNicolas Pitre totalram_pages += free_area(__phys_to_pfn(__pa(start)), 6816db015e4SNicolas Pitre __phys_to_pfn(__pa(end)), 6826db015e4SNicolas Pitre "initrd"); 6831da177e4SLinus Torvalds } 6841da177e4SLinus Torvalds 6851da177e4SLinus Torvalds static int __init keepinitrd_setup(char *__unused) 6861da177e4SLinus Torvalds { 6871da177e4SLinus Torvalds keep_initrd = 1; 6881da177e4SLinus Torvalds return 1; 6891da177e4SLinus Torvalds } 6901da177e4SLinus Torvalds 6911da177e4SLinus Torvalds __setup("keepinitrd", keepinitrd_setup); 6921da177e4SLinus Torvalds #endif 693