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"); 987bf02ea2SDavid Rientjes show_free_areas(filter); 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 214be20902bSRussell King #ifdef CONFIG_ZONE_DMA 215022ae537SRussell King /* 216022ae537SRussell King * The DMA mask corresponding to the maximum bus address allocatable 217022ae537SRussell King * using GFP_DMA. The default here places no restriction on DMA 218022ae537SRussell King * allocations. This must be the smallest DMA mask in the system, 219022ae537SRussell King * so a successful GFP_DMA allocation will always satisfy this. 220022ae537SRussell King */ 221022ae537SRussell King u32 arm_dma_limit; 222022ae537SRussell King 223be20902bSRussell King static void __init arm_adjust_dma_zone(unsigned long *size, unsigned long *hole, 224be20902bSRussell King unsigned long dma_size) 225be20902bSRussell King { 226be20902bSRussell King if (size[0] <= dma_size) 227be20902bSRussell King return; 228be20902bSRussell King 229be20902bSRussell King size[ZONE_NORMAL] = size[0] - dma_size; 230be20902bSRussell King size[ZONE_DMA] = dma_size; 231be20902bSRussell King hole[ZONE_NORMAL] = hole[0]; 232be20902bSRussell King hole[ZONE_DMA] = 0; 233be20902bSRussell King } 234be20902bSRussell King #endif 235be20902bSRussell King 236a2c54d2aSRussell King static void __init arm_bootmem_free(unsigned long min, unsigned long max_low, 237a2c54d2aSRussell King unsigned long max_high) 238b7a69ac3SRussell King { 239b7a69ac3SRussell King unsigned long zone_size[MAX_NR_ZONES], zhole_size[MAX_NR_ZONES]; 240a2c54d2aSRussell King struct memblock_region *reg; 241b7a69ac3SRussell King 24290072059SRussell King /* 243be370302SRussell King * initialise the zones. 24490072059SRussell King */ 24590072059SRussell King memset(zone_size, 0, sizeof(zone_size)); 24690072059SRussell King 24790072059SRussell King /* 248be370302SRussell King * The memory size has already been determined. If we need 249be370302SRussell King * to do anything fancy with the allocation of this memory 250be370302SRussell King * to the zones, now is the time to do it. 25190072059SRussell King */ 252dde5828fSRussell King zone_size[0] = max_low - min; 253dde5828fSRussell King #ifdef CONFIG_HIGHMEM 254dde5828fSRussell King zone_size[ZONE_HIGHMEM] = max_high - max_low; 255dde5828fSRussell King #endif 25690072059SRussell King 25790072059SRussell King /* 258be370302SRussell King * Calculate the size of the holes. 259be370302SRussell King * holes = node_size - sum(bank_sizes) 26090072059SRussell King */ 261dde5828fSRussell King memcpy(zhole_size, zone_size, sizeof(zhole_size)); 262a2c54d2aSRussell King for_each_memblock(memory, reg) { 263a2c54d2aSRussell King unsigned long start = memblock_region_memory_base_pfn(reg); 264a2c54d2aSRussell King unsigned long end = memblock_region_memory_end_pfn(reg); 265a2c54d2aSRussell King 266a2c54d2aSRussell King if (start < max_low) { 267a2c54d2aSRussell King unsigned long low_end = min(end, max_low); 268a2c54d2aSRussell King zhole_size[0] -= low_end - start; 269a2c54d2aSRussell King } 270dde5828fSRussell King #ifdef CONFIG_HIGHMEM 271a2c54d2aSRussell King if (end > max_low) { 272a2c54d2aSRussell King unsigned long high_start = max(start, max_low); 273a2c54d2aSRussell King zhole_size[ZONE_HIGHMEM] -= end - high_start; 274a2c54d2aSRussell King } 275dde5828fSRussell King #endif 276dde5828fSRussell King } 27790072059SRussell King 278be20902bSRussell King #ifdef ARM_DMA_ZONE_SIZE 279be20902bSRussell King #ifndef CONFIG_ZONE_DMA 280be20902bSRussell King #error ARM_DMA_ZONE_SIZE set but no DMA zone to limit allocations 281be20902bSRussell King #endif 282be20902bSRussell King 28390072059SRussell King /* 28490072059SRussell King * Adjust the sizes according to any special requirements for 28590072059SRussell King * this machine type. 28690072059SRussell King */ 287be20902bSRussell King arm_adjust_dma_zone(zone_size, zhole_size, 288be20902bSRussell King ARM_DMA_ZONE_SIZE >> PAGE_SHIFT); 289022ae537SRussell King 290022ae537SRussell King arm_dma_limit = PHYS_OFFSET + ARM_DMA_ZONE_SIZE - 1; 291be20902bSRussell King #endif 29290072059SRussell King 293be370302SRussell King free_area_init_node(0, zone_size, min, zhole_size); 29490072059SRussell King } 29590072059SRussell King 2967b7bf499SWill Deacon #ifdef CONFIG_HAVE_ARCH_PFN_VALID 297b7cfda9fSRussell King int pfn_valid(unsigned long pfn) 298b7cfda9fSRussell King { 2995e6f6aa1SBenjamin Herrenschmidt return memblock_is_memory(pfn << PAGE_SHIFT); 300b7cfda9fSRussell King } 301b7cfda9fSRussell King EXPORT_SYMBOL(pfn_valid); 3027b7bf499SWill Deacon #endif 303657e12fdSRussell King 3047b7bf499SWill Deacon #ifndef CONFIG_SPARSEMEM 305eda2e5dcSRussell King static void arm_memory_present(void) 306657e12fdSRussell King { 307657e12fdSRussell King } 308657e12fdSRussell King #else 309eda2e5dcSRussell King static void arm_memory_present(void) 310657e12fdSRussell King { 311719c1514SBenjamin Herrenschmidt struct memblock_region *reg; 312719c1514SBenjamin Herrenschmidt 3137c996361SYinghai Lu for_each_memblock(memory, reg) 314c7fc2de0SYinghai Lu memory_present(0, memblock_region_memory_base_pfn(reg), 315c7fc2de0SYinghai Lu memblock_region_memory_end_pfn(reg)); 316657e12fdSRussell King } 317b7cfda9fSRussell King #endif 318b7cfda9fSRussell King 3197dc50ec7SRussell King static int __init meminfo_cmp(const void *_a, const void *_b) 3207dc50ec7SRussell King { 3217dc50ec7SRussell King const struct membank *a = _a, *b = _b; 3227dc50ec7SRussell King long cmp = bank_pfn_start(a) - bank_pfn_start(b); 3237dc50ec7SRussell King return cmp < 0 ? -1 : cmp > 0 ? 1 : 0; 3247dc50ec7SRussell King } 3257dc50ec7SRussell King 3268d717a52SRussell King void __init arm_memblock_init(struct meminfo *mi, struct machine_desc *mdesc) 3272778f620SRussell King { 3282778f620SRussell King int i; 3292778f620SRussell King 3307dc50ec7SRussell King sort(&meminfo.bank, meminfo.nr_banks, sizeof(meminfo.bank[0]), meminfo_cmp, NULL); 3317dc50ec7SRussell King 3322778f620SRussell King memblock_init(); 3332778f620SRussell King for (i = 0; i < mi->nr_banks; i++) 3342778f620SRussell King memblock_add(mi->bank[i].start, mi->bank[i].size); 3352778f620SRussell King 3362778f620SRussell King /* Register the kernel text, kernel data and initrd with memblock. */ 3372778f620SRussell King #ifdef CONFIG_XIP_KERNEL 338842eab40SRussell King memblock_reserve(__pa(_sdata), _end - _sdata); 3392778f620SRussell King #else 3402778f620SRussell King memblock_reserve(__pa(_stext), _end - _stext); 3412778f620SRussell King #endif 3422778f620SRussell King #ifdef CONFIG_BLK_DEV_INITRD 343b0a2679dSRussell King if (phys_initrd_size && 3448f4b8c76SRussell King !memblock_is_region_memory(phys_initrd_start, phys_initrd_size)) { 3458f4b8c76SRussell King pr_err("INITRD: 0x%08lx+0x%08lx is not a memory region - disabling initrd\n", 3468f4b8c76SRussell King phys_initrd_start, phys_initrd_size); 3478f4b8c76SRussell King phys_initrd_start = phys_initrd_size = 0; 3488f4b8c76SRussell King } 3498f4b8c76SRussell King if (phys_initrd_size && 350b0a2679dSRussell King memblock_is_region_reserved(phys_initrd_start, phys_initrd_size)) { 351b0a2679dSRussell King pr_err("INITRD: 0x%08lx+0x%08lx overlaps in-use memory region - disabling initrd\n", 352b0a2679dSRussell King phys_initrd_start, phys_initrd_size); 353b0a2679dSRussell King phys_initrd_start = phys_initrd_size = 0; 354b0a2679dSRussell King } 3552778f620SRussell King if (phys_initrd_size) { 3562778f620SRussell King memblock_reserve(phys_initrd_start, phys_initrd_size); 3572778f620SRussell King 3582778f620SRussell King /* Now convert initrd to virtual addresses */ 3592778f620SRussell King initrd_start = __phys_to_virt(phys_initrd_start); 3602778f620SRussell King initrd_end = initrd_start + phys_initrd_size; 3612778f620SRussell King } 3622778f620SRussell King #endif 3632778f620SRussell King 3642778f620SRussell King arm_mm_memblock_reserve(); 36593c02ab4SGrant Likely arm_dt_memblock_reserve(); 3662778f620SRussell King 3678d717a52SRussell King /* reserve any platform specific memblock areas */ 3688d717a52SRussell King if (mdesc->reserve) 3698d717a52SRussell King mdesc->reserve(); 3708d717a52SRussell King 3712778f620SRussell King memblock_analyze(); 3722778f620SRussell King memblock_dump_all(); 3732778f620SRussell King } 3742778f620SRussell King 3758d717a52SRussell King void __init bootmem_init(void) 37690072059SRussell King { 377dde5828fSRussell King unsigned long min, max_low, max_high; 37890072059SRussell King 379dde5828fSRussell King max_low = max_high = 0; 380dde5828fSRussell King 381f25b4b4cSRussell King find_limits(&min, &max_low, &max_high); 382dde5828fSRussell King 383a801d276SRussell King arm_bootmem_init(min, max_low); 384dde5828fSRussell King 385b7a69ac3SRussell King /* 386657e12fdSRussell King * Sparsemem tries to allocate bootmem in memory_present(), 387657e12fdSRussell King * so must be done after the fixed reservations 388657e12fdSRussell King */ 389eda2e5dcSRussell King arm_memory_present(); 39090072059SRussell King 391b7a69ac3SRussell King /* 392b7a69ac3SRussell King * sparse_init() needs the bootmem allocator up and running. 393b7a69ac3SRussell King */ 394b7a69ac3SRussell King sparse_init(); 395b7a69ac3SRussell King 396b7a69ac3SRussell King /* 397be370302SRussell King * Now free the memory - free_area_init_node needs 398b7a69ac3SRussell King * the sparse mem_map arrays initialized by sparse_init() 399b7a69ac3SRussell King * for memmap_init_zone(), otherwise all PFNs are invalid. 400b7a69ac3SRussell King */ 401a2c54d2aSRussell King arm_bootmem_free(min, max_low, max_high); 402b7a69ac3SRussell King 403cae6292bSWill Deacon high_memory = __va(((phys_addr_t)max_low << PAGE_SHIFT) - 1) + 1; 40490072059SRussell King 40590072059SRussell King /* 40690072059SRussell King * This doesn't seem to be used by the Linux memory manager any 40790072059SRussell King * more, but is used by ll_rw_block. If we can get rid of it, we 40890072059SRussell King * also get rid of some of the stuff above as well. 40990072059SRussell King * 41090072059SRussell King * Note: max_low_pfn and max_pfn reflect the number of _pages_ in 41190072059SRussell King * the system, not the maximum PFN. 41290072059SRussell King */ 413dde5828fSRussell King max_low_pfn = max_low - PHYS_PFN_OFFSET; 414dde5828fSRussell King max_pfn = max_high - PHYS_PFN_OFFSET; 41590072059SRussell King } 41690072059SRussell King 4176db015e4SNicolas Pitre static inline int free_area(unsigned long pfn, unsigned long end, char *s) 4181da177e4SLinus Torvalds { 4196db015e4SNicolas Pitre unsigned int pages = 0, size = (end - pfn) << (PAGE_SHIFT - 10); 4201da177e4SLinus Torvalds 4216db015e4SNicolas Pitre for (; pfn < end; pfn++) { 4226db015e4SNicolas Pitre struct page *page = pfn_to_page(pfn); 4231da177e4SLinus Torvalds ClearPageReserved(page); 4247835e98bSNick Piggin init_page_count(page); 4256db015e4SNicolas Pitre __free_page(page); 4266db015e4SNicolas Pitre pages++; 4271da177e4SLinus Torvalds } 4281da177e4SLinus Torvalds 4291da177e4SLinus Torvalds if (size && s) 4301da177e4SLinus Torvalds printk(KERN_INFO "Freeing %s memory: %dK\n", s, size); 4316db015e4SNicolas Pitre 4326db015e4SNicolas Pitre return pages; 4331da177e4SLinus Torvalds } 4341da177e4SLinus Torvalds 435a013053dSRussell King static inline void 436be370302SRussell King free_memmap(unsigned long start_pfn, unsigned long end_pfn) 437a013053dSRussell King { 438a013053dSRussell King struct page *start_pg, *end_pg; 439a013053dSRussell King unsigned long pg, pgend; 440a013053dSRussell King 441a013053dSRussell King /* 442a013053dSRussell King * Convert start_pfn/end_pfn to a struct page pointer. 443a013053dSRussell King */ 4443257f43dSCatalin Marinas start_pg = pfn_to_page(start_pfn - 1) + 1; 4459af386c8SWill Deacon end_pg = pfn_to_page(end_pfn - 1) + 1; 446a013053dSRussell King 447a013053dSRussell King /* 448a013053dSRussell King * Convert to physical addresses, and 449a013053dSRussell King * round start upwards and end downwards. 450a013053dSRussell King */ 451cae6292bSWill Deacon pg = (unsigned long)PAGE_ALIGN(__pa(start_pg)); 452cae6292bSWill Deacon pgend = (unsigned long)__pa(end_pg) & PAGE_MASK; 453a013053dSRussell King 454a013053dSRussell King /* 455a013053dSRussell King * If there are free pages between these, 456a013053dSRussell King * free the section of the memmap array. 457a013053dSRussell King */ 458a013053dSRussell King if (pg < pgend) 459be370302SRussell King free_bootmem(pg, pgend - pg); 460a013053dSRussell King } 461a013053dSRussell King 462a013053dSRussell King /* 463a013053dSRussell King * The mem_map array can get very big. Free the unused area of the memory map. 464a013053dSRussell King */ 465be370302SRussell King static void __init free_unused_memmap(struct meminfo *mi) 466a013053dSRussell King { 467a013053dSRussell King unsigned long bank_start, prev_bank_end = 0; 468a013053dSRussell King unsigned int i; 469a013053dSRussell King 470a013053dSRussell King /* 4713260e529SMichael Bohan * This relies on each bank being in address order. 4723260e529SMichael Bohan * The banks are sorted previously in bootmem_init(). 473a013053dSRussell King */ 474be370302SRussell King for_each_bank(i, mi) { 475d2a38ef9SRussell King struct membank *bank = &mi->bank[i]; 476d2a38ef9SRussell King 477d2a38ef9SRussell King bank_start = bank_pfn_start(bank); 478a013053dSRussell King 4799af386c8SWill Deacon #ifdef CONFIG_SPARSEMEM 4809af386c8SWill Deacon /* 4819af386c8SWill Deacon * Take care not to free memmap entries that don't exist 4829af386c8SWill Deacon * due to SPARSEMEM sections which aren't present. 4839af386c8SWill Deacon */ 4849af386c8SWill Deacon bank_start = min(bank_start, 4859af386c8SWill Deacon ALIGN(prev_bank_end, PAGES_PER_SECTION)); 4869af386c8SWill Deacon #endif 487a013053dSRussell King /* 488a013053dSRussell King * If we had a previous bank, and there is a space 489a013053dSRussell King * between the current bank and the previous, free it. 490a013053dSRussell King */ 4913260e529SMichael Bohan if (prev_bank_end && prev_bank_end < bank_start) 492be370302SRussell King free_memmap(prev_bank_end, bank_start); 493a013053dSRussell King 4943260e529SMichael Bohan /* 4953260e529SMichael Bohan * Align up here since the VM subsystem insists that the 4963260e529SMichael Bohan * memmap entries are valid from the bank end aligned to 4973260e529SMichael Bohan * MAX_ORDER_NR_PAGES. 4983260e529SMichael Bohan */ 4993260e529SMichael Bohan prev_bank_end = ALIGN(bank_pfn_end(bank), MAX_ORDER_NR_PAGES); 500a013053dSRussell King } 5019af386c8SWill Deacon 5029af386c8SWill Deacon #ifdef CONFIG_SPARSEMEM 5039af386c8SWill Deacon if (!IS_ALIGNED(prev_bank_end, PAGES_PER_SECTION)) 5049af386c8SWill Deacon free_memmap(prev_bank_end, 5059af386c8SWill Deacon ALIGN(prev_bank_end, PAGES_PER_SECTION)); 5069af386c8SWill Deacon #endif 507a013053dSRussell King } 508a013053dSRussell King 509d0e775afSRussell King static void __init free_highpages(void) 510d0e775afSRussell King { 511d0e775afSRussell King #ifdef CONFIG_HIGHMEM 512df4f14c7SRussell King unsigned long max_low = max_low_pfn + PHYS_PFN_OFFSET; 513df4f14c7SRussell King struct memblock_region *mem, *res; 514d0e775afSRussell King 515d0e775afSRussell King /* set highmem page free */ 516df4f14c7SRussell King for_each_memblock(memory, mem) { 517df4f14c7SRussell King unsigned long start = memblock_region_memory_base_pfn(mem); 518df4f14c7SRussell King unsigned long end = memblock_region_memory_end_pfn(mem); 519df4f14c7SRussell King 520df4f14c7SRussell King /* Ignore complete lowmem entries */ 521df4f14c7SRussell King if (end <= max_low) 522df4f14c7SRussell King continue; 523df4f14c7SRussell King 524df4f14c7SRussell King /* Truncate partial highmem entries */ 525df4f14c7SRussell King if (start < max_low) 526df4f14c7SRussell King start = max_low; 527df4f14c7SRussell King 528df4f14c7SRussell King /* Find and exclude any reserved regions */ 529df4f14c7SRussell King for_each_memblock(reserved, res) { 530df4f14c7SRussell King unsigned long res_start, res_end; 531df4f14c7SRussell King 532df4f14c7SRussell King res_start = memblock_region_reserved_base_pfn(res); 533df4f14c7SRussell King res_end = memblock_region_reserved_end_pfn(res); 534df4f14c7SRussell King 535df4f14c7SRussell King if (res_end < start) 536df4f14c7SRussell King continue; 537df4f14c7SRussell King if (res_start < start) 538df4f14c7SRussell King res_start = start; 539df4f14c7SRussell King if (res_start > end) 540df4f14c7SRussell King res_start = end; 541df4f14c7SRussell King if (res_end > end) 542df4f14c7SRussell King res_end = end; 543df4f14c7SRussell King if (res_start != start) 544df4f14c7SRussell King totalhigh_pages += free_area(start, res_start, 545df4f14c7SRussell King NULL); 546df4f14c7SRussell King start = res_end; 547df4f14c7SRussell King if (start == end) 548df4f14c7SRussell King break; 549df4f14c7SRussell King } 550df4f14c7SRussell King 551df4f14c7SRussell King /* And now free anything which remains */ 552df4f14c7SRussell King if (start < end) 553d0e775afSRussell King totalhigh_pages += free_area(start, end, NULL); 554d0e775afSRussell King } 555d0e775afSRussell King totalram_pages += totalhigh_pages; 556d0e775afSRussell King #endif 557d0e775afSRussell King } 558d0e775afSRussell King 5591da177e4SLinus Torvalds /* 5601da177e4SLinus Torvalds * mem_init() marks the free areas in the mem_map and tells us how much 5611da177e4SLinus Torvalds * memory is free. This is done after various parts of the system have 5621da177e4SLinus Torvalds * claimed their memory after the kernel image. 5631da177e4SLinus Torvalds */ 5641da177e4SLinus Torvalds void __init mem_init(void) 5651da177e4SLinus Torvalds { 566db9ef1afSFenkart/Bostandzhyan unsigned long reserved_pages, free_pages; 56747ea3c15SRussell King struct memblock_region *reg; 568be370302SRussell King int i; 5691dbd30e9SLinus Walleij #ifdef CONFIG_HAVE_TCM 5701dbd30e9SLinus Walleij /* These pointers are filled in on TCM detection */ 5711dbd30e9SLinus Walleij extern u32 dtcm_end; 5721dbd30e9SLinus Walleij extern u32 itcm_end; 5731dbd30e9SLinus Walleij #endif 5741da177e4SLinus Torvalds 5753835f6cbSNicolas Pitre max_mapnr = pfn_to_page(max_pfn + PHYS_PFN_OFFSET) - mem_map; 5761da177e4SLinus Torvalds 5771da177e4SLinus Torvalds /* this will put all unused low memory onto the freelists */ 578be370302SRussell King free_unused_memmap(&meminfo); 5791da177e4SLinus Torvalds 580be370302SRussell King totalram_pages += free_all_bootmem(); 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 588d0e775afSRussell King free_highpages(); 5893835f6cbSNicolas Pitre 590db9ef1afSFenkart/Bostandzhyan reserved_pages = free_pages = 0; 591db9ef1afSFenkart/Bostandzhyan 592be370302SRussell King for_each_bank(i, &meminfo) { 593db9ef1afSFenkart/Bostandzhyan struct membank *bank = &meminfo.bank[i]; 594db9ef1afSFenkart/Bostandzhyan unsigned int pfn1, pfn2; 595db9ef1afSFenkart/Bostandzhyan struct page *page, *end; 596db9ef1afSFenkart/Bostandzhyan 597db9ef1afSFenkart/Bostandzhyan pfn1 = bank_pfn_start(bank); 598db9ef1afSFenkart/Bostandzhyan pfn2 = bank_pfn_end(bank); 599db9ef1afSFenkart/Bostandzhyan 600ea056df7SCatalin Marinas page = pfn_to_page(pfn1); 601ea056df7SCatalin Marinas end = pfn_to_page(pfn2 - 1) + 1; 602db9ef1afSFenkart/Bostandzhyan 603db9ef1afSFenkart/Bostandzhyan do { 604db9ef1afSFenkart/Bostandzhyan if (PageReserved(page)) 605db9ef1afSFenkart/Bostandzhyan reserved_pages++; 606db9ef1afSFenkart/Bostandzhyan else if (!page_count(page)) 607db9ef1afSFenkart/Bostandzhyan free_pages++; 608db9ef1afSFenkart/Bostandzhyan page++; 609db9ef1afSFenkart/Bostandzhyan } while (page < end); 610db9ef1afSFenkart/Bostandzhyan } 611db9ef1afSFenkart/Bostandzhyan 6121da177e4SLinus Torvalds /* 6131da177e4SLinus Torvalds * Since our memory may not be contiguous, calculate the 6141da177e4SLinus Torvalds * real number of pages we have in this system 6151da177e4SLinus Torvalds */ 6161da177e4SLinus Torvalds printk(KERN_INFO "Memory:"); 6171da177e4SLinus Torvalds num_physpages = 0; 61847ea3c15SRussell King for_each_memblock(memory, reg) { 61947ea3c15SRussell King unsigned long pages = memblock_region_memory_end_pfn(reg) - 62047ea3c15SRussell King memblock_region_memory_base_pfn(reg); 62147ea3c15SRussell King num_physpages += pages; 62247ea3c15SRussell King printk(" %ldMB", pages >> (20 - PAGE_SHIFT)); 6231da177e4SLinus Torvalds } 6241da177e4SLinus Torvalds printk(" = %luMB total\n", num_physpages >> (20 - PAGE_SHIFT)); 6256db015e4SNicolas Pitre 626db9ef1afSFenkart/Bostandzhyan printk(KERN_NOTICE "Memory: %luk/%luk available, %luk reserved, %luK highmem\n", 627db9ef1afSFenkart/Bostandzhyan nr_free_pages() << (PAGE_SHIFT-10), 628db9ef1afSFenkart/Bostandzhyan free_pages << (PAGE_SHIFT-10), 629db9ef1afSFenkart/Bostandzhyan reserved_pages << (PAGE_SHIFT-10), 6304b529401SAndreas Fenkart totalhigh_pages << (PAGE_SHIFT-10)); 6311da177e4SLinus Torvalds 632db9ef1afSFenkart/Bostandzhyan #define MLK(b, t) b, t, ((t) - (b)) >> 10 633db9ef1afSFenkart/Bostandzhyan #define MLM(b, t) b, t, ((t) - (b)) >> 20 634db9ef1afSFenkart/Bostandzhyan #define MLK_ROUNDUP(b, t) b, t, DIV_ROUND_UP(((t) - (b)), SZ_1K) 635db9ef1afSFenkart/Bostandzhyan 636db9ef1afSFenkart/Bostandzhyan printk(KERN_NOTICE "Virtual kernel memory layout:\n" 637db9ef1afSFenkart/Bostandzhyan " vector : 0x%08lx - 0x%08lx (%4ld kB)\n" 63807d2a5c7SLinus Walleij #ifdef CONFIG_HAVE_TCM 63907d2a5c7SLinus Walleij " DTCM : 0x%08lx - 0x%08lx (%4ld kB)\n" 64007d2a5c7SLinus Walleij " ITCM : 0x%08lx - 0x%08lx (%4ld kB)\n" 64107d2a5c7SLinus Walleij #endif 642db9ef1afSFenkart/Bostandzhyan " fixmap : 0x%08lx - 0x%08lx (%4ld kB)\n" 643a7bd08c8SFenkart/Bostandzhyan #ifdef CONFIG_MMU 644a7bd08c8SFenkart/Bostandzhyan " DMA : 0x%08lx - 0x%08lx (%4ld MB)\n" 645a7bd08c8SFenkart/Bostandzhyan #endif 646db9ef1afSFenkart/Bostandzhyan " vmalloc : 0x%08lx - 0x%08lx (%4ld MB)\n" 647db9ef1afSFenkart/Bostandzhyan " lowmem : 0x%08lx - 0x%08lx (%4ld MB)\n" 648db9ef1afSFenkart/Bostandzhyan #ifdef CONFIG_HIGHMEM 649db9ef1afSFenkart/Bostandzhyan " pkmap : 0x%08lx - 0x%08lx (%4ld MB)\n" 650db9ef1afSFenkart/Bostandzhyan #endif 651db9ef1afSFenkart/Bostandzhyan " modules : 0x%08lx - 0x%08lx (%4ld MB)\n" 652db9ef1afSFenkart/Bostandzhyan " .init : 0x%p" " - 0x%p" " (%4d kB)\n" 653db9ef1afSFenkart/Bostandzhyan " .text : 0x%p" " - 0x%p" " (%4d kB)\n" 65445f6d7e0SRabin Vincent " .data : 0x%p" " - 0x%p" " (%4d kB)\n" 65545f6d7e0SRabin Vincent " .bss : 0x%p" " - 0x%p" " (%4d kB)\n", 656db9ef1afSFenkart/Bostandzhyan 657db9ef1afSFenkart/Bostandzhyan MLK(UL(CONFIG_VECTORS_BASE), UL(CONFIG_VECTORS_BASE) + 658db9ef1afSFenkart/Bostandzhyan (PAGE_SIZE)), 65907d2a5c7SLinus Walleij #ifdef CONFIG_HAVE_TCM 6601dbd30e9SLinus Walleij MLK(DTCM_OFFSET, (unsigned long) dtcm_end), 6611dbd30e9SLinus Walleij MLK(ITCM_OFFSET, (unsigned long) itcm_end), 66207d2a5c7SLinus Walleij #endif 663db9ef1afSFenkart/Bostandzhyan MLK(FIXADDR_START, FIXADDR_TOP), 664a7bd08c8SFenkart/Bostandzhyan #ifdef CONFIG_MMU 665a7bd08c8SFenkart/Bostandzhyan MLM(CONSISTENT_BASE, CONSISTENT_END), 666a7bd08c8SFenkart/Bostandzhyan #endif 667c931b4f6SFenkart/Bostandzhyan MLM(VMALLOC_START, VMALLOC_END), 668db9ef1afSFenkart/Bostandzhyan MLM(PAGE_OFFSET, (unsigned long)high_memory), 669db9ef1afSFenkart/Bostandzhyan #ifdef CONFIG_HIGHMEM 670db9ef1afSFenkart/Bostandzhyan MLM(PKMAP_BASE, (PKMAP_BASE) + (LAST_PKMAP) * 671db9ef1afSFenkart/Bostandzhyan (PAGE_SIZE)), 672db9ef1afSFenkart/Bostandzhyan #endif 673db9ef1afSFenkart/Bostandzhyan MLM(MODULES_VADDR, MODULES_END), 674db9ef1afSFenkart/Bostandzhyan 675db9ef1afSFenkart/Bostandzhyan MLK_ROUNDUP(__init_begin, __init_end), 676db9ef1afSFenkart/Bostandzhyan MLK_ROUNDUP(_text, _etext), 67745f6d7e0SRabin Vincent MLK_ROUNDUP(_sdata, _edata), 67845f6d7e0SRabin Vincent MLK_ROUNDUP(__bss_start, __bss_stop)); 679db9ef1afSFenkart/Bostandzhyan 680db9ef1afSFenkart/Bostandzhyan #undef MLK 681db9ef1afSFenkart/Bostandzhyan #undef MLM 682db9ef1afSFenkart/Bostandzhyan #undef MLK_ROUNDUP 683db9ef1afSFenkart/Bostandzhyan 684a1839272SFenkart/Bostandzhyan /* 685a1839272SFenkart/Bostandzhyan * Check boundaries twice: Some fundamental inconsistencies can 686a1839272SFenkart/Bostandzhyan * be detected at build time already. 687a1839272SFenkart/Bostandzhyan */ 688a1839272SFenkart/Bostandzhyan #ifdef CONFIG_MMU 689a1839272SFenkart/Bostandzhyan BUILD_BUG_ON(VMALLOC_END > CONSISTENT_BASE); 690a1839272SFenkart/Bostandzhyan BUG_ON(VMALLOC_END > CONSISTENT_BASE); 691a1839272SFenkart/Bostandzhyan 692a1839272SFenkart/Bostandzhyan BUILD_BUG_ON(TASK_SIZE > MODULES_VADDR); 693a1839272SFenkart/Bostandzhyan BUG_ON(TASK_SIZE > MODULES_VADDR); 694a1839272SFenkart/Bostandzhyan #endif 695a1839272SFenkart/Bostandzhyan 696a1839272SFenkart/Bostandzhyan #ifdef CONFIG_HIGHMEM 697a1839272SFenkart/Bostandzhyan BUILD_BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE > PAGE_OFFSET); 698a1839272SFenkart/Bostandzhyan BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE > PAGE_OFFSET); 699a1839272SFenkart/Bostandzhyan #endif 700a1839272SFenkart/Bostandzhyan 7011da177e4SLinus Torvalds if (PAGE_SIZE >= 16384 && num_physpages <= 128) { 7021da177e4SLinus Torvalds extern int sysctl_overcommit_memory; 7031da177e4SLinus Torvalds /* 7041da177e4SLinus Torvalds * On a machine this small we won't get 7051da177e4SLinus Torvalds * anywhere without overcommit, so turn 7061da177e4SLinus Torvalds * it on by default. 7071da177e4SLinus Torvalds */ 7081da177e4SLinus Torvalds sysctl_overcommit_memory = OVERCOMMIT_ALWAYS; 7091da177e4SLinus Torvalds } 7101da177e4SLinus Torvalds } 7111da177e4SLinus Torvalds 7121da177e4SLinus Torvalds void free_initmem(void) 7131da177e4SLinus Torvalds { 714bc581770SLinus Walleij #ifdef CONFIG_HAVE_TCM 715ea208f64SLinus Walleij extern char __tcm_start, __tcm_end; 716bc581770SLinus Walleij 717ea208f64SLinus Walleij totalram_pages += free_area(__phys_to_pfn(__pa(&__tcm_start)), 718ea208f64SLinus Walleij __phys_to_pfn(__pa(&__tcm_end)), 719bc581770SLinus Walleij "TCM link"); 720bc581770SLinus Walleij #endif 721bc581770SLinus Walleij 7226db015e4SNicolas Pitre if (!machine_is_integrator() && !machine_is_cintegrator()) 72337efe642SRussell King totalram_pages += free_area(__phys_to_pfn(__pa(__init_begin)), 72437efe642SRussell King __phys_to_pfn(__pa(__init_end)), 7251da177e4SLinus Torvalds "init"); 7261da177e4SLinus Torvalds } 7271da177e4SLinus Torvalds 7281da177e4SLinus Torvalds #ifdef CONFIG_BLK_DEV_INITRD 7291da177e4SLinus Torvalds 7301da177e4SLinus Torvalds static int keep_initrd; 7311da177e4SLinus Torvalds 7321da177e4SLinus Torvalds void free_initrd_mem(unsigned long start, unsigned long end) 7331da177e4SLinus Torvalds { 7341da177e4SLinus Torvalds if (!keep_initrd) 7356db015e4SNicolas Pitre totalram_pages += free_area(__phys_to_pfn(__pa(start)), 7366db015e4SNicolas Pitre __phys_to_pfn(__pa(end)), 7376db015e4SNicolas Pitre "initrd"); 7381da177e4SLinus Torvalds } 7391da177e4SLinus Torvalds 7401da177e4SLinus Torvalds static int __init keepinitrd_setup(char *__unused) 7411da177e4SLinus Torvalds { 7421da177e4SLinus Torvalds keep_initrd = 1; 7431da177e4SLinus Torvalds return 1; 7441da177e4SLinus Torvalds } 7451da177e4SLinus Torvalds 7461da177e4SLinus Torvalds __setup("keepinitrd", keepinitrd_setup); 7471da177e4SLinus Torvalds #endif 748