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> 16dc28094bSPaul Gortmaker #include <linux/export.h> 171da177e4SLinus Torvalds #include <linux/nodemask.h> 181da177e4SLinus Torvalds #include <linux/initrd.h> 199eb8f674SGrant Likely #include <linux/of_fdt.h> 203835f6cbSNicolas Pitre #include <linux/highmem.h> 215a0e3ad6STejun Heo #include <linux/gfp.h> 222778f620SRussell King #include <linux/memblock.h> 237dc50ec7SRussell King #include <linux/sort.h> 241da177e4SLinus Torvalds 251da177e4SLinus Torvalds #include <asm/mach-types.h> 2693c02ab4SGrant Likely #include <asm/prom.h> 2737efe642SRussell King #include <asm/sections.h> 281da177e4SLinus Torvalds #include <asm/setup.h> 2974d02fb9SRussell King #include <asm/sizes.h> 301da177e4SLinus Torvalds #include <asm/tlb.h> 31db9ef1afSFenkart/Bostandzhyan #include <asm/fixmap.h> 321da177e4SLinus Torvalds 331da177e4SLinus Torvalds #include <asm/mach/arch.h> 341da177e4SLinus Torvalds #include <asm/mach/map.h> 351da177e4SLinus Torvalds 361b2e2b73SRussell King #include "mm.h" 371b2e2b73SRussell King 38012d1f4aSRussell King static unsigned long phys_initrd_start __initdata = 0; 39012d1f4aSRussell King static unsigned long phys_initrd_size __initdata = 0; 40012d1f4aSRussell King 412b0d8c25SJeremy Kerr static int __init early_initrd(char *p) 42012d1f4aSRussell King { 43012d1f4aSRussell King unsigned long start, size; 442b0d8c25SJeremy Kerr char *endp; 45012d1f4aSRussell King 462b0d8c25SJeremy Kerr start = memparse(p, &endp); 472b0d8c25SJeremy Kerr if (*endp == ',') { 482b0d8c25SJeremy Kerr size = memparse(endp + 1, NULL); 49012d1f4aSRussell King 50012d1f4aSRussell King phys_initrd_start = start; 51012d1f4aSRussell King phys_initrd_size = size; 52012d1f4aSRussell King } 532b0d8c25SJeremy Kerr return 0; 54012d1f4aSRussell King } 552b0d8c25SJeremy Kerr early_param("initrd", early_initrd); 56012d1f4aSRussell King 57012d1f4aSRussell King static int __init parse_tag_initrd(const struct tag *tag) 58012d1f4aSRussell King { 59012d1f4aSRussell King printk(KERN_WARNING "ATAG_INITRD is deprecated; " 60012d1f4aSRussell King "please update your bootloader.\n"); 61012d1f4aSRussell King phys_initrd_start = __virt_to_phys(tag->u.initrd.start); 62012d1f4aSRussell King phys_initrd_size = tag->u.initrd.size; 63012d1f4aSRussell King return 0; 64012d1f4aSRussell King } 65012d1f4aSRussell King 66012d1f4aSRussell King __tagtable(ATAG_INITRD, parse_tag_initrd); 67012d1f4aSRussell King 68012d1f4aSRussell King static int __init parse_tag_initrd2(const struct tag *tag) 69012d1f4aSRussell King { 70012d1f4aSRussell King phys_initrd_start = tag->u.initrd.start; 71012d1f4aSRussell King phys_initrd_size = tag->u.initrd.size; 72012d1f4aSRussell King return 0; 73012d1f4aSRussell King } 74012d1f4aSRussell King 75012d1f4aSRussell King __tagtable(ATAG_INITRD2, parse_tag_initrd2); 761da177e4SLinus Torvalds 779eb8f674SGrant Likely #ifdef CONFIG_OF_FLATTREE 789eb8f674SGrant Likely void __init early_init_dt_setup_initrd_arch(unsigned long start, unsigned long end) 799eb8f674SGrant Likely { 809eb8f674SGrant Likely phys_initrd_start = start; 819eb8f674SGrant Likely phys_initrd_size = end - start; 829eb8f674SGrant Likely } 839eb8f674SGrant Likely #endif /* CONFIG_OF_FLATTREE */ 849eb8f674SGrant Likely 851da177e4SLinus Torvalds /* 864b5f32ceSNicolas Pitre * This keeps memory configuration data used by a couple memory 874b5f32ceSNicolas Pitre * initialization functions, as well as show_mem() for the skipping 884b5f32ceSNicolas Pitre * of holes in the memory map. It is populated by arm_add_memory(). 891da177e4SLinus Torvalds */ 904b5f32ceSNicolas Pitre struct meminfo meminfo; 915e709827SRay Lehtiniemi 92b2b755b5SDavid Rientjes void show_mem(unsigned int filter) 931da177e4SLinus Torvalds { 941da177e4SLinus Torvalds int free = 0, total = 0, reserved = 0; 95be370302SRussell King int shared = 0, cached = 0, slab = 0, i; 965e709827SRay Lehtiniemi struct meminfo * mi = &meminfo; 971da177e4SLinus Torvalds 981da177e4SLinus Torvalds printk("Mem-info:\n"); 997bf02ea2SDavid Rientjes show_free_areas(filter); 100be370302SRussell King 101be370302SRussell King for_each_bank (i, mi) { 102d2a38ef9SRussell King struct membank *bank = &mi->bank[i]; 1035e709827SRay Lehtiniemi unsigned int pfn1, pfn2; 1041da177e4SLinus Torvalds struct page *page, *end; 1051da177e4SLinus Torvalds 106d2a38ef9SRussell King pfn1 = bank_pfn_start(bank); 107d2a38ef9SRussell King pfn2 = bank_pfn_end(bank); 1085e709827SRay Lehtiniemi 109ea056df7SCatalin Marinas page = pfn_to_page(pfn1); 110ea056df7SCatalin Marinas end = pfn_to_page(pfn2 - 1) + 1; 1111da177e4SLinus Torvalds 1121da177e4SLinus Torvalds do { 1131da177e4SLinus Torvalds total++; 1141da177e4SLinus Torvalds if (PageReserved(page)) 1151da177e4SLinus Torvalds reserved++; 1161da177e4SLinus Torvalds else if (PageSwapCache(page)) 1171da177e4SLinus Torvalds cached++; 1181da177e4SLinus Torvalds else if (PageSlab(page)) 1191da177e4SLinus Torvalds slab++; 1201da177e4SLinus Torvalds else if (!page_count(page)) 1211da177e4SLinus Torvalds free++; 1221da177e4SLinus Torvalds else 1231da177e4SLinus Torvalds shared += page_count(page) - 1; 1241da177e4SLinus Torvalds page++; 1251da177e4SLinus Torvalds } while (page < end); 1261da177e4SLinus Torvalds } 1271da177e4SLinus Torvalds 1281da177e4SLinus Torvalds printk("%d pages of RAM\n", total); 1291da177e4SLinus Torvalds printk("%d free pages\n", free); 1301da177e4SLinus Torvalds printk("%d reserved pages\n", reserved); 1311da177e4SLinus Torvalds printk("%d slab pages\n", slab); 1321da177e4SLinus Torvalds printk("%d pages shared\n", shared); 1331da177e4SLinus Torvalds printk("%d pages swap cached\n", cached); 1341da177e4SLinus Torvalds } 1351da177e4SLinus Torvalds 136f25b4b4cSRussell King static void __init find_limits(unsigned long *min, unsigned long *max_low, 137f25b4b4cSRussell King unsigned long *max_high) 138dde5828fSRussell King { 139f25b4b4cSRussell King struct meminfo *mi = &meminfo; 140dde5828fSRussell King int i; 141dde5828fSRussell King 142dde5828fSRussell King *min = -1UL; 143dde5828fSRussell King *max_low = *max_high = 0; 144dde5828fSRussell King 145be370302SRussell King for_each_bank (i, mi) { 146dde5828fSRussell King struct membank *bank = &mi->bank[i]; 147dde5828fSRussell King unsigned long start, end; 148dde5828fSRussell King 149dde5828fSRussell King start = bank_pfn_start(bank); 150dde5828fSRussell King end = bank_pfn_end(bank); 151dde5828fSRussell King 152dde5828fSRussell King if (*min > start) 153dde5828fSRussell King *min = start; 154dde5828fSRussell King if (*max_high < end) 155dde5828fSRussell King *max_high = end; 156dde5828fSRussell King if (bank->highmem) 157dde5828fSRussell King continue; 158dde5828fSRussell King if (*max_low < end) 159dde5828fSRussell King *max_low = end; 160dde5828fSRussell King } 161dde5828fSRussell King } 162dde5828fSRussell King 163a801d276SRussell King static void __init arm_bootmem_init(unsigned long start_pfn, 164a801d276SRussell King unsigned long end_pfn) 1651da177e4SLinus Torvalds { 166719c1514SBenjamin Herrenschmidt struct memblock_region *reg; 16790072059SRussell King unsigned int boot_pages; 1682778f620SRussell King phys_addr_t bitmap; 16990072059SRussell King pg_data_t *pgdat; 1701da177e4SLinus Torvalds 17190072059SRussell King /* 1722778f620SRussell King * Allocate the bootmem bitmap page. This must be in a region 1732778f620SRussell King * of memory which has already been mapped. 1741da177e4SLinus Torvalds */ 17590072059SRussell King boot_pages = bootmem_bootmap_pages(end_pfn - start_pfn); 1762778f620SRussell King bitmap = memblock_alloc_base(boot_pages << PAGE_SHIFT, L1_CACHE_BYTES, 1772778f620SRussell King __pfn_to_phys(end_pfn)); 1781da177e4SLinus Torvalds 1791da177e4SLinus Torvalds /* 180be370302SRussell King * Initialise the bootmem allocator, handing the 18190072059SRussell King * memory banks over to bootmem. 1821da177e4SLinus Torvalds */ 183be370302SRussell King node_set_online(0); 184be370302SRussell King pgdat = NODE_DATA(0); 1852778f620SRussell King init_bootmem_node(pgdat, __phys_to_pfn(bitmap), start_pfn, end_pfn); 18690072059SRussell King 187a801d276SRussell King /* Free the lowmem regions from memblock into bootmem. */ 188a801d276SRussell King for_each_memblock(memory, reg) { 189a801d276SRussell King unsigned long start = memblock_region_memory_base_pfn(reg); 190a801d276SRussell King unsigned long end = memblock_region_memory_end_pfn(reg); 191a801d276SRussell King 192a801d276SRussell King if (end >= end_pfn) 193a801d276SRussell King end = end_pfn; 194a801d276SRussell King if (start >= end) 195a801d276SRussell King break; 196a801d276SRussell King 197a801d276SRussell King free_bootmem(__pfn_to_phys(start), (end - start) << PAGE_SHIFT); 198d2a38ef9SRussell King } 1991da177e4SLinus Torvalds 200a801d276SRussell King /* Reserve the lowmem memblock reserved regions in bootmem. */ 201719c1514SBenjamin Herrenschmidt for_each_memblock(reserved, reg) { 202a801d276SRussell King unsigned long start = memblock_region_reserved_base_pfn(reg); 203a801d276SRussell King unsigned long end = memblock_region_reserved_end_pfn(reg); 204a801d276SRussell King 205a801d276SRussell King if (end >= end_pfn) 206a801d276SRussell King end = end_pfn; 207a801d276SRussell King if (start >= end) 208a801d276SRussell King break; 209a801d276SRussell King 210a801d276SRussell King reserve_bootmem(__pfn_to_phys(start), 211a801d276SRussell King (end - start) << PAGE_SHIFT, BOOTMEM_DEFAULT); 212b7a69ac3SRussell King } 213b7a69ac3SRussell King } 214b7a69ac3SRussell King 215be20902bSRussell King #ifdef CONFIG_ZONE_DMA 21665032018SNicolas Pitre 21765032018SNicolas Pitre unsigned long arm_dma_zone_size __read_mostly; 21865032018SNicolas Pitre EXPORT_SYMBOL(arm_dma_zone_size); 21965032018SNicolas Pitre 220022ae537SRussell King /* 221022ae537SRussell King * The DMA mask corresponding to the maximum bus address allocatable 222022ae537SRussell King * using GFP_DMA. The default here places no restriction on DMA 223022ae537SRussell King * allocations. This must be the smallest DMA mask in the system, 224022ae537SRussell King * so a successful GFP_DMA allocation will always satisfy this. 225022ae537SRussell King */ 226022ae537SRussell King u32 arm_dma_limit; 227022ae537SRussell King 228be20902bSRussell King static void __init arm_adjust_dma_zone(unsigned long *size, unsigned long *hole, 229be20902bSRussell King unsigned long dma_size) 230be20902bSRussell King { 231be20902bSRussell King if (size[0] <= dma_size) 232be20902bSRussell King return; 233be20902bSRussell King 234be20902bSRussell King size[ZONE_NORMAL] = size[0] - dma_size; 235be20902bSRussell King size[ZONE_DMA] = dma_size; 236be20902bSRussell King hole[ZONE_NORMAL] = hole[0]; 237be20902bSRussell King hole[ZONE_DMA] = 0; 238be20902bSRussell King } 239be20902bSRussell King #endif 240be20902bSRussell King 241a2c54d2aSRussell King static void __init arm_bootmem_free(unsigned long min, unsigned long max_low, 242a2c54d2aSRussell King unsigned long max_high) 243b7a69ac3SRussell King { 244b7a69ac3SRussell King unsigned long zone_size[MAX_NR_ZONES], zhole_size[MAX_NR_ZONES]; 245a2c54d2aSRussell King struct memblock_region *reg; 246b7a69ac3SRussell King 24790072059SRussell King /* 248be370302SRussell King * initialise the zones. 24990072059SRussell King */ 25090072059SRussell King memset(zone_size, 0, sizeof(zone_size)); 25190072059SRussell King 25290072059SRussell King /* 253be370302SRussell King * The memory size has already been determined. If we need 254be370302SRussell King * to do anything fancy with the allocation of this memory 255be370302SRussell King * to the zones, now is the time to do it. 25690072059SRussell King */ 257dde5828fSRussell King zone_size[0] = max_low - min; 258dde5828fSRussell King #ifdef CONFIG_HIGHMEM 259dde5828fSRussell King zone_size[ZONE_HIGHMEM] = max_high - max_low; 260dde5828fSRussell King #endif 26190072059SRussell King 26290072059SRussell King /* 263be370302SRussell King * Calculate the size of the holes. 264be370302SRussell King * holes = node_size - sum(bank_sizes) 26590072059SRussell King */ 266dde5828fSRussell King memcpy(zhole_size, zone_size, sizeof(zhole_size)); 267a2c54d2aSRussell King for_each_memblock(memory, reg) { 268a2c54d2aSRussell King unsigned long start = memblock_region_memory_base_pfn(reg); 269a2c54d2aSRussell King unsigned long end = memblock_region_memory_end_pfn(reg); 270a2c54d2aSRussell King 271a2c54d2aSRussell King if (start < max_low) { 272a2c54d2aSRussell King unsigned long low_end = min(end, max_low); 273a2c54d2aSRussell King zhole_size[0] -= low_end - start; 274a2c54d2aSRussell King } 275dde5828fSRussell King #ifdef CONFIG_HIGHMEM 276a2c54d2aSRussell King if (end > max_low) { 277a2c54d2aSRussell King unsigned long high_start = max(start, max_low); 278a2c54d2aSRussell King zhole_size[ZONE_HIGHMEM] -= end - high_start; 279a2c54d2aSRussell King } 280dde5828fSRussell King #endif 281dde5828fSRussell King } 28290072059SRussell King 28365032018SNicolas Pitre #ifdef CONFIG_ZONE_DMA 28490072059SRussell King /* 28590072059SRussell King * Adjust the sizes according to any special requirements for 28690072059SRussell King * this machine type. 28790072059SRussell King */ 28865032018SNicolas Pitre if (arm_dma_zone_size) { 289be20902bSRussell King arm_adjust_dma_zone(zone_size, zhole_size, 29065032018SNicolas Pitre arm_dma_zone_size >> PAGE_SHIFT); 29165032018SNicolas Pitre arm_dma_limit = PHYS_OFFSET + arm_dma_zone_size - 1; 29265032018SNicolas Pitre } else 29365032018SNicolas Pitre arm_dma_limit = 0xffffffff; 294be20902bSRussell King #endif 29590072059SRussell King 296be370302SRussell King free_area_init_node(0, zone_size, min, zhole_size); 29790072059SRussell King } 29890072059SRussell King 2997b7bf499SWill Deacon #ifdef CONFIG_HAVE_ARCH_PFN_VALID 300b7cfda9fSRussell King int pfn_valid(unsigned long pfn) 301b7cfda9fSRussell King { 302fb492c91SMark Rutland return memblock_is_memory(__pfn_to_phys(pfn)); 303b7cfda9fSRussell King } 304b7cfda9fSRussell King EXPORT_SYMBOL(pfn_valid); 3057b7bf499SWill Deacon #endif 306657e12fdSRussell King 3077b7bf499SWill Deacon #ifndef CONFIG_SPARSEMEM 308eda2e5dcSRussell King static void arm_memory_present(void) 309657e12fdSRussell King { 310657e12fdSRussell King } 311657e12fdSRussell King #else 312eda2e5dcSRussell King static void arm_memory_present(void) 313657e12fdSRussell King { 314719c1514SBenjamin Herrenschmidt struct memblock_region *reg; 315719c1514SBenjamin Herrenschmidt 3167c996361SYinghai Lu for_each_memblock(memory, reg) 317c7fc2de0SYinghai Lu memory_present(0, memblock_region_memory_base_pfn(reg), 318c7fc2de0SYinghai Lu memblock_region_memory_end_pfn(reg)); 319657e12fdSRussell King } 320b7cfda9fSRussell King #endif 321b7cfda9fSRussell King 3227dc50ec7SRussell King static int __init meminfo_cmp(const void *_a, const void *_b) 3237dc50ec7SRussell King { 3247dc50ec7SRussell King const struct membank *a = _a, *b = _b; 3257dc50ec7SRussell King long cmp = bank_pfn_start(a) - bank_pfn_start(b); 3267dc50ec7SRussell King return cmp < 0 ? -1 : cmp > 0 ? 1 : 0; 3277dc50ec7SRussell King } 3287dc50ec7SRussell King 3298d717a52SRussell King void __init arm_memblock_init(struct meminfo *mi, struct machine_desc *mdesc) 3302778f620SRussell King { 3312778f620SRussell King int i; 3322778f620SRussell King 3337dc50ec7SRussell King sort(&meminfo.bank, meminfo.nr_banks, sizeof(meminfo.bank[0]), meminfo_cmp, NULL); 3347dc50ec7SRussell King 3352778f620SRussell King memblock_init(); 3362778f620SRussell King for (i = 0; i < mi->nr_banks; i++) 3372778f620SRussell King memblock_add(mi->bank[i].start, mi->bank[i].size); 3382778f620SRussell King 3392778f620SRussell King /* Register the kernel text, kernel data and initrd with memblock. */ 3402778f620SRussell King #ifdef CONFIG_XIP_KERNEL 341842eab40SRussell King memblock_reserve(__pa(_sdata), _end - _sdata); 3422778f620SRussell King #else 3432778f620SRussell King memblock_reserve(__pa(_stext), _end - _stext); 3442778f620SRussell King #endif 3452778f620SRussell King #ifdef CONFIG_BLK_DEV_INITRD 346b0a2679dSRussell King if (phys_initrd_size && 3478f4b8c76SRussell King !memblock_is_region_memory(phys_initrd_start, phys_initrd_size)) { 3488f4b8c76SRussell King pr_err("INITRD: 0x%08lx+0x%08lx is not a memory region - disabling initrd\n", 3498f4b8c76SRussell King phys_initrd_start, phys_initrd_size); 3508f4b8c76SRussell King phys_initrd_start = phys_initrd_size = 0; 3518f4b8c76SRussell King } 3528f4b8c76SRussell King if (phys_initrd_size && 353b0a2679dSRussell King memblock_is_region_reserved(phys_initrd_start, phys_initrd_size)) { 354b0a2679dSRussell King pr_err("INITRD: 0x%08lx+0x%08lx overlaps in-use memory region - disabling initrd\n", 355b0a2679dSRussell King phys_initrd_start, phys_initrd_size); 356b0a2679dSRussell King phys_initrd_start = phys_initrd_size = 0; 357b0a2679dSRussell King } 3582778f620SRussell King if (phys_initrd_size) { 3592778f620SRussell King memblock_reserve(phys_initrd_start, phys_initrd_size); 3602778f620SRussell King 3612778f620SRussell King /* Now convert initrd to virtual addresses */ 3622778f620SRussell King initrd_start = __phys_to_virt(phys_initrd_start); 3632778f620SRussell King initrd_end = initrd_start + phys_initrd_size; 3642778f620SRussell King } 3652778f620SRussell King #endif 3662778f620SRussell King 3672778f620SRussell King arm_mm_memblock_reserve(); 36893c02ab4SGrant Likely arm_dt_memblock_reserve(); 3692778f620SRussell King 3708d717a52SRussell King /* reserve any platform specific memblock areas */ 3718d717a52SRussell King if (mdesc->reserve) 3728d717a52SRussell King mdesc->reserve(); 3738d717a52SRussell King 3742778f620SRussell King memblock_analyze(); 3752778f620SRussell King memblock_dump_all(); 3762778f620SRussell King } 3772778f620SRussell King 3788d717a52SRussell King void __init bootmem_init(void) 37990072059SRussell King { 380dde5828fSRussell King unsigned long min, max_low, max_high; 38190072059SRussell King 382dde5828fSRussell King max_low = max_high = 0; 383dde5828fSRussell King 384f25b4b4cSRussell King find_limits(&min, &max_low, &max_high); 385dde5828fSRussell King 386a801d276SRussell King arm_bootmem_init(min, max_low); 387dde5828fSRussell King 388b7a69ac3SRussell King /* 389657e12fdSRussell King * Sparsemem tries to allocate bootmem in memory_present(), 390657e12fdSRussell King * so must be done after the fixed reservations 391657e12fdSRussell King */ 392eda2e5dcSRussell King arm_memory_present(); 39390072059SRussell King 394b7a69ac3SRussell King /* 395b7a69ac3SRussell King * sparse_init() needs the bootmem allocator up and running. 396b7a69ac3SRussell King */ 397b7a69ac3SRussell King sparse_init(); 398b7a69ac3SRussell King 399b7a69ac3SRussell King /* 400be370302SRussell King * Now free the memory - free_area_init_node needs 401b7a69ac3SRussell King * the sparse mem_map arrays initialized by sparse_init() 402b7a69ac3SRussell King * for memmap_init_zone(), otherwise all PFNs are invalid. 403b7a69ac3SRussell King */ 404a2c54d2aSRussell King arm_bootmem_free(min, max_low, max_high); 405b7a69ac3SRussell King 406cae6292bSWill Deacon high_memory = __va(((phys_addr_t)max_low << PAGE_SHIFT) - 1) + 1; 40790072059SRussell King 40890072059SRussell King /* 40990072059SRussell King * This doesn't seem to be used by the Linux memory manager any 41090072059SRussell King * more, but is used by ll_rw_block. If we can get rid of it, we 41190072059SRussell King * also get rid of some of the stuff above as well. 41290072059SRussell King * 41390072059SRussell King * Note: max_low_pfn and max_pfn reflect the number of _pages_ in 41490072059SRussell King * the system, not the maximum PFN. 41590072059SRussell King */ 416dde5828fSRussell King max_low_pfn = max_low - PHYS_PFN_OFFSET; 417dde5828fSRussell King max_pfn = max_high - PHYS_PFN_OFFSET; 41890072059SRussell King } 41990072059SRussell King 4206db015e4SNicolas Pitre static inline int free_area(unsigned long pfn, unsigned long end, char *s) 4211da177e4SLinus Torvalds { 4226db015e4SNicolas Pitre unsigned int pages = 0, size = (end - pfn) << (PAGE_SHIFT - 10); 4231da177e4SLinus Torvalds 4246db015e4SNicolas Pitre for (; pfn < end; pfn++) { 4256db015e4SNicolas Pitre struct page *page = pfn_to_page(pfn); 4261da177e4SLinus Torvalds ClearPageReserved(page); 4277835e98bSNick Piggin init_page_count(page); 4286db015e4SNicolas Pitre __free_page(page); 4296db015e4SNicolas Pitre pages++; 4301da177e4SLinus Torvalds } 4311da177e4SLinus Torvalds 4321da177e4SLinus Torvalds if (size && s) 4331da177e4SLinus Torvalds printk(KERN_INFO "Freeing %s memory: %dK\n", s, size); 4346db015e4SNicolas Pitre 4356db015e4SNicolas Pitre return pages; 4361da177e4SLinus Torvalds } 4371da177e4SLinus Torvalds 43854d52573SStephen Boyd /* 43954d52573SStephen Boyd * Poison init memory with an undefined instruction (ARM) or a branch to an 44054d52573SStephen Boyd * undefined instruction (Thumb). 44154d52573SStephen Boyd */ 44254d52573SStephen Boyd static inline void poison_init_mem(void *s, size_t count) 44354d52573SStephen Boyd { 44454d52573SStephen Boyd u32 *p = (u32 *)s; 445bf912d99SJamie Iles for (; count != 0; count -= 4) 44654d52573SStephen Boyd *p++ = 0xe7fddef0; 44754d52573SStephen Boyd } 44854d52573SStephen Boyd 449a013053dSRussell King static inline void 450be370302SRussell King free_memmap(unsigned long start_pfn, unsigned long end_pfn) 451a013053dSRussell King { 452a013053dSRussell King struct page *start_pg, *end_pg; 453a013053dSRussell King unsigned long pg, pgend; 454a013053dSRussell King 455a013053dSRussell King /* 456a013053dSRussell King * Convert start_pfn/end_pfn to a struct page pointer. 457a013053dSRussell King */ 4583257f43dSCatalin Marinas start_pg = pfn_to_page(start_pfn - 1) + 1; 4599af386c8SWill Deacon end_pg = pfn_to_page(end_pfn - 1) + 1; 460a013053dSRussell King 461a013053dSRussell King /* 462a013053dSRussell King * Convert to physical addresses, and 463a013053dSRussell King * round start upwards and end downwards. 464a013053dSRussell King */ 465cae6292bSWill Deacon pg = (unsigned long)PAGE_ALIGN(__pa(start_pg)); 466cae6292bSWill Deacon pgend = (unsigned long)__pa(end_pg) & PAGE_MASK; 467a013053dSRussell King 468a013053dSRussell King /* 469a013053dSRussell King * If there are free pages between these, 470a013053dSRussell King * free the section of the memmap array. 471a013053dSRussell King */ 472a013053dSRussell King if (pg < pgend) 473be370302SRussell King free_bootmem(pg, pgend - pg); 474a013053dSRussell King } 475a013053dSRussell King 476a013053dSRussell King /* 477a013053dSRussell King * The mem_map array can get very big. Free the unused area of the memory map. 478a013053dSRussell King */ 479be370302SRussell King static void __init free_unused_memmap(struct meminfo *mi) 480a013053dSRussell King { 481a013053dSRussell King unsigned long bank_start, prev_bank_end = 0; 482a013053dSRussell King unsigned int i; 483a013053dSRussell King 484a013053dSRussell King /* 4853260e529SMichael Bohan * This relies on each bank being in address order. 4863260e529SMichael Bohan * The banks are sorted previously in bootmem_init(). 487a013053dSRussell King */ 488be370302SRussell King for_each_bank(i, mi) { 489d2a38ef9SRussell King struct membank *bank = &mi->bank[i]; 490d2a38ef9SRussell King 491d2a38ef9SRussell King bank_start = bank_pfn_start(bank); 492a013053dSRussell King 4939af386c8SWill Deacon #ifdef CONFIG_SPARSEMEM 4949af386c8SWill Deacon /* 4959af386c8SWill Deacon * Take care not to free memmap entries that don't exist 4969af386c8SWill Deacon * due to SPARSEMEM sections which aren't present. 4979af386c8SWill Deacon */ 4989af386c8SWill Deacon bank_start = min(bank_start, 4999af386c8SWill Deacon ALIGN(prev_bank_end, PAGES_PER_SECTION)); 500002ea9eeSLinus Walleij #else 501002ea9eeSLinus Walleij /* 502002ea9eeSLinus Walleij * Align down here since the VM subsystem insists that the 503002ea9eeSLinus Walleij * memmap entries are valid from the bank start aligned to 504002ea9eeSLinus Walleij * MAX_ORDER_NR_PAGES. 505002ea9eeSLinus Walleij */ 506002ea9eeSLinus Walleij bank_start = round_down(bank_start, MAX_ORDER_NR_PAGES); 5079af386c8SWill Deacon #endif 508a013053dSRussell King /* 509a013053dSRussell King * If we had a previous bank, and there is a space 510a013053dSRussell King * between the current bank and the previous, free it. 511a013053dSRussell King */ 5123260e529SMichael Bohan if (prev_bank_end && prev_bank_end < bank_start) 513be370302SRussell King free_memmap(prev_bank_end, bank_start); 514a013053dSRussell King 5153260e529SMichael Bohan /* 5163260e529SMichael Bohan * Align up here since the VM subsystem insists that the 5173260e529SMichael Bohan * memmap entries are valid from the bank end aligned to 5183260e529SMichael Bohan * MAX_ORDER_NR_PAGES. 5193260e529SMichael Bohan */ 5203260e529SMichael Bohan prev_bank_end = ALIGN(bank_pfn_end(bank), MAX_ORDER_NR_PAGES); 521a013053dSRussell King } 5229af386c8SWill Deacon 5239af386c8SWill Deacon #ifdef CONFIG_SPARSEMEM 5249af386c8SWill Deacon if (!IS_ALIGNED(prev_bank_end, PAGES_PER_SECTION)) 5259af386c8SWill Deacon free_memmap(prev_bank_end, 5269af386c8SWill Deacon ALIGN(prev_bank_end, PAGES_PER_SECTION)); 5279af386c8SWill Deacon #endif 528a013053dSRussell King } 529a013053dSRussell King 530d0e775afSRussell King static void __init free_highpages(void) 531d0e775afSRussell King { 532d0e775afSRussell King #ifdef CONFIG_HIGHMEM 533df4f14c7SRussell King unsigned long max_low = max_low_pfn + PHYS_PFN_OFFSET; 534df4f14c7SRussell King struct memblock_region *mem, *res; 535d0e775afSRussell King 536d0e775afSRussell King /* set highmem page free */ 537df4f14c7SRussell King for_each_memblock(memory, mem) { 538df4f14c7SRussell King unsigned long start = memblock_region_memory_base_pfn(mem); 539df4f14c7SRussell King unsigned long end = memblock_region_memory_end_pfn(mem); 540df4f14c7SRussell King 541df4f14c7SRussell King /* Ignore complete lowmem entries */ 542df4f14c7SRussell King if (end <= max_low) 543df4f14c7SRussell King continue; 544df4f14c7SRussell King 545df4f14c7SRussell King /* Truncate partial highmem entries */ 546df4f14c7SRussell King if (start < max_low) 547df4f14c7SRussell King start = max_low; 548df4f14c7SRussell King 549df4f14c7SRussell King /* Find and exclude any reserved regions */ 550df4f14c7SRussell King for_each_memblock(reserved, res) { 551df4f14c7SRussell King unsigned long res_start, res_end; 552df4f14c7SRussell King 553df4f14c7SRussell King res_start = memblock_region_reserved_base_pfn(res); 554df4f14c7SRussell King res_end = memblock_region_reserved_end_pfn(res); 555df4f14c7SRussell King 556df4f14c7SRussell King if (res_end < start) 557df4f14c7SRussell King continue; 558df4f14c7SRussell King if (res_start < start) 559df4f14c7SRussell King res_start = start; 560df4f14c7SRussell King if (res_start > end) 561df4f14c7SRussell King res_start = end; 562df4f14c7SRussell King if (res_end > end) 563df4f14c7SRussell King res_end = end; 564df4f14c7SRussell King if (res_start != start) 565df4f14c7SRussell King totalhigh_pages += free_area(start, res_start, 566df4f14c7SRussell King NULL); 567df4f14c7SRussell King start = res_end; 568df4f14c7SRussell King if (start == end) 569df4f14c7SRussell King break; 570df4f14c7SRussell King } 571df4f14c7SRussell King 572df4f14c7SRussell King /* And now free anything which remains */ 573df4f14c7SRussell King if (start < end) 574d0e775afSRussell King totalhigh_pages += free_area(start, end, NULL); 575d0e775afSRussell King } 576d0e775afSRussell King totalram_pages += totalhigh_pages; 577d0e775afSRussell King #endif 578d0e775afSRussell King } 579d0e775afSRussell King 5801da177e4SLinus Torvalds /* 5811da177e4SLinus Torvalds * mem_init() marks the free areas in the mem_map and tells us how much 5821da177e4SLinus Torvalds * memory is free. This is done after various parts of the system have 5831da177e4SLinus Torvalds * claimed their memory after the kernel image. 5841da177e4SLinus Torvalds */ 5851da177e4SLinus Torvalds void __init mem_init(void) 5861da177e4SLinus Torvalds { 587db9ef1afSFenkart/Bostandzhyan unsigned long reserved_pages, free_pages; 58847ea3c15SRussell King struct memblock_region *reg; 589be370302SRussell King int i; 5901dbd30e9SLinus Walleij #ifdef CONFIG_HAVE_TCM 5911dbd30e9SLinus Walleij /* These pointers are filled in on TCM detection */ 5921dbd30e9SLinus Walleij extern u32 dtcm_end; 5931dbd30e9SLinus Walleij extern u32 itcm_end; 5941dbd30e9SLinus Walleij #endif 5951da177e4SLinus Torvalds 5963835f6cbSNicolas Pitre max_mapnr = pfn_to_page(max_pfn + PHYS_PFN_OFFSET) - mem_map; 5971da177e4SLinus Torvalds 5981da177e4SLinus Torvalds /* this will put all unused low memory onto the freelists */ 599be370302SRussell King free_unused_memmap(&meminfo); 6001da177e4SLinus Torvalds 601be370302SRussell King totalram_pages += free_all_bootmem(); 6021da177e4SLinus Torvalds 6031da177e4SLinus Torvalds #ifdef CONFIG_SA1111 6041da177e4SLinus Torvalds /* now that our DMA memory is actually so designated, we can free it */ 6056db015e4SNicolas Pitre totalram_pages += free_area(PHYS_PFN_OFFSET, 6066db015e4SNicolas Pitre __phys_to_pfn(__pa(swapper_pg_dir)), NULL); 6071da177e4SLinus Torvalds #endif 6081da177e4SLinus Torvalds 609d0e775afSRussell King free_highpages(); 6103835f6cbSNicolas Pitre 611db9ef1afSFenkart/Bostandzhyan reserved_pages = free_pages = 0; 612db9ef1afSFenkart/Bostandzhyan 613be370302SRussell King for_each_bank(i, &meminfo) { 614db9ef1afSFenkart/Bostandzhyan struct membank *bank = &meminfo.bank[i]; 615db9ef1afSFenkart/Bostandzhyan unsigned int pfn1, pfn2; 616db9ef1afSFenkart/Bostandzhyan struct page *page, *end; 617db9ef1afSFenkart/Bostandzhyan 618db9ef1afSFenkart/Bostandzhyan pfn1 = bank_pfn_start(bank); 619db9ef1afSFenkart/Bostandzhyan pfn2 = bank_pfn_end(bank); 620db9ef1afSFenkart/Bostandzhyan 621ea056df7SCatalin Marinas page = pfn_to_page(pfn1); 622ea056df7SCatalin Marinas end = pfn_to_page(pfn2 - 1) + 1; 623db9ef1afSFenkart/Bostandzhyan 624db9ef1afSFenkart/Bostandzhyan do { 625db9ef1afSFenkart/Bostandzhyan if (PageReserved(page)) 626db9ef1afSFenkart/Bostandzhyan reserved_pages++; 627db9ef1afSFenkart/Bostandzhyan else if (!page_count(page)) 628db9ef1afSFenkart/Bostandzhyan free_pages++; 629db9ef1afSFenkart/Bostandzhyan page++; 630db9ef1afSFenkart/Bostandzhyan } while (page < end); 631db9ef1afSFenkart/Bostandzhyan } 632db9ef1afSFenkart/Bostandzhyan 6331da177e4SLinus Torvalds /* 6341da177e4SLinus Torvalds * Since our memory may not be contiguous, calculate the 6351da177e4SLinus Torvalds * real number of pages we have in this system 6361da177e4SLinus Torvalds */ 6371da177e4SLinus Torvalds printk(KERN_INFO "Memory:"); 6381da177e4SLinus Torvalds num_physpages = 0; 63947ea3c15SRussell King for_each_memblock(memory, reg) { 64047ea3c15SRussell King unsigned long pages = memblock_region_memory_end_pfn(reg) - 64147ea3c15SRussell King memblock_region_memory_base_pfn(reg); 64247ea3c15SRussell King num_physpages += pages; 64347ea3c15SRussell King printk(" %ldMB", pages >> (20 - PAGE_SHIFT)); 6441da177e4SLinus Torvalds } 6451da177e4SLinus Torvalds printk(" = %luMB total\n", num_physpages >> (20 - PAGE_SHIFT)); 6466db015e4SNicolas Pitre 647db9ef1afSFenkart/Bostandzhyan printk(KERN_NOTICE "Memory: %luk/%luk available, %luk reserved, %luK highmem\n", 648db9ef1afSFenkart/Bostandzhyan nr_free_pages() << (PAGE_SHIFT-10), 649db9ef1afSFenkart/Bostandzhyan free_pages << (PAGE_SHIFT-10), 650db9ef1afSFenkart/Bostandzhyan reserved_pages << (PAGE_SHIFT-10), 6514b529401SAndreas Fenkart totalhigh_pages << (PAGE_SHIFT-10)); 6521da177e4SLinus Torvalds 653db9ef1afSFenkart/Bostandzhyan #define MLK(b, t) b, t, ((t) - (b)) >> 10 654db9ef1afSFenkart/Bostandzhyan #define MLM(b, t) b, t, ((t) - (b)) >> 20 655db9ef1afSFenkart/Bostandzhyan #define MLK_ROUNDUP(b, t) b, t, DIV_ROUND_UP(((t) - (b)), SZ_1K) 656db9ef1afSFenkart/Bostandzhyan 657db9ef1afSFenkart/Bostandzhyan printk(KERN_NOTICE "Virtual kernel memory layout:\n" 658db9ef1afSFenkart/Bostandzhyan " vector : 0x%08lx - 0x%08lx (%4ld kB)\n" 65907d2a5c7SLinus Walleij #ifdef CONFIG_HAVE_TCM 66007d2a5c7SLinus Walleij " DTCM : 0x%08lx - 0x%08lx (%4ld kB)\n" 66107d2a5c7SLinus Walleij " ITCM : 0x%08lx - 0x%08lx (%4ld kB)\n" 66207d2a5c7SLinus Walleij #endif 663db9ef1afSFenkart/Bostandzhyan " fixmap : 0x%08lx - 0x%08lx (%4ld kB)\n" 664db9ef1afSFenkart/Bostandzhyan " vmalloc : 0x%08lx - 0x%08lx (%4ld MB)\n" 665db9ef1afSFenkart/Bostandzhyan " lowmem : 0x%08lx - 0x%08lx (%4ld MB)\n" 666db9ef1afSFenkart/Bostandzhyan #ifdef CONFIG_HIGHMEM 667db9ef1afSFenkart/Bostandzhyan " pkmap : 0x%08lx - 0x%08lx (%4ld MB)\n" 668db9ef1afSFenkart/Bostandzhyan #endif 669db9ef1afSFenkart/Bostandzhyan " modules : 0x%08lx - 0x%08lx (%4ld MB)\n" 670db9ef1afSFenkart/Bostandzhyan " .text : 0x%p" " - 0x%p" " (%4d kB)\n" 6713835d69aSRussell King " .init : 0x%p" " - 0x%p" " (%4d kB)\n" 67245f6d7e0SRabin Vincent " .data : 0x%p" " - 0x%p" " (%4d kB)\n" 67345f6d7e0SRabin Vincent " .bss : 0x%p" " - 0x%p" " (%4d kB)\n", 674db9ef1afSFenkart/Bostandzhyan 675db9ef1afSFenkart/Bostandzhyan MLK(UL(CONFIG_VECTORS_BASE), UL(CONFIG_VECTORS_BASE) + 676db9ef1afSFenkart/Bostandzhyan (PAGE_SIZE)), 67707d2a5c7SLinus Walleij #ifdef CONFIG_HAVE_TCM 6781dbd30e9SLinus Walleij MLK(DTCM_OFFSET, (unsigned long) dtcm_end), 6791dbd30e9SLinus Walleij MLK(ITCM_OFFSET, (unsigned long) itcm_end), 68007d2a5c7SLinus Walleij #endif 681db9ef1afSFenkart/Bostandzhyan MLK(FIXADDR_START, FIXADDR_TOP), 682c931b4f6SFenkart/Bostandzhyan MLM(VMALLOC_START, VMALLOC_END), 683db9ef1afSFenkart/Bostandzhyan MLM(PAGE_OFFSET, (unsigned long)high_memory), 684db9ef1afSFenkart/Bostandzhyan #ifdef CONFIG_HIGHMEM 685db9ef1afSFenkart/Bostandzhyan MLM(PKMAP_BASE, (PKMAP_BASE) + (LAST_PKMAP) * 686db9ef1afSFenkart/Bostandzhyan (PAGE_SIZE)), 687db9ef1afSFenkart/Bostandzhyan #endif 688db9ef1afSFenkart/Bostandzhyan MLM(MODULES_VADDR, MODULES_END), 689db9ef1afSFenkart/Bostandzhyan 690db9ef1afSFenkart/Bostandzhyan MLK_ROUNDUP(_text, _etext), 6913835d69aSRussell King MLK_ROUNDUP(__init_begin, __init_end), 69245f6d7e0SRabin Vincent MLK_ROUNDUP(_sdata, _edata), 69345f6d7e0SRabin Vincent MLK_ROUNDUP(__bss_start, __bss_stop)); 694db9ef1afSFenkart/Bostandzhyan 695db9ef1afSFenkart/Bostandzhyan #undef MLK 696db9ef1afSFenkart/Bostandzhyan #undef MLM 697db9ef1afSFenkart/Bostandzhyan #undef MLK_ROUNDUP 698db9ef1afSFenkart/Bostandzhyan 699a1839272SFenkart/Bostandzhyan /* 700a1839272SFenkart/Bostandzhyan * Check boundaries twice: Some fundamental inconsistencies can 701a1839272SFenkart/Bostandzhyan * be detected at build time already. 702a1839272SFenkart/Bostandzhyan */ 703a1839272SFenkart/Bostandzhyan #ifdef CONFIG_MMU 704a1839272SFenkart/Bostandzhyan BUILD_BUG_ON(TASK_SIZE > MODULES_VADDR); 705a1839272SFenkart/Bostandzhyan BUG_ON(TASK_SIZE > MODULES_VADDR); 706a1839272SFenkart/Bostandzhyan #endif 707a1839272SFenkart/Bostandzhyan 708a1839272SFenkart/Bostandzhyan #ifdef CONFIG_HIGHMEM 709a1839272SFenkart/Bostandzhyan BUILD_BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE > PAGE_OFFSET); 710a1839272SFenkart/Bostandzhyan BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE > PAGE_OFFSET); 711a1839272SFenkart/Bostandzhyan #endif 712a1839272SFenkart/Bostandzhyan 7131da177e4SLinus Torvalds if (PAGE_SIZE >= 16384 && num_physpages <= 128) { 7141da177e4SLinus Torvalds extern int sysctl_overcommit_memory; 7151da177e4SLinus Torvalds /* 7161da177e4SLinus Torvalds * On a machine this small we won't get 7171da177e4SLinus Torvalds * anywhere without overcommit, so turn 7181da177e4SLinus Torvalds * it on by default. 7191da177e4SLinus Torvalds */ 7201da177e4SLinus Torvalds sysctl_overcommit_memory = OVERCOMMIT_ALWAYS; 7211da177e4SLinus Torvalds } 7221da177e4SLinus Torvalds } 7231da177e4SLinus Torvalds 7241da177e4SLinus Torvalds void free_initmem(void) 7251da177e4SLinus Torvalds { 726bc581770SLinus Walleij #ifdef CONFIG_HAVE_TCM 727ea208f64SLinus Walleij extern char __tcm_start, __tcm_end; 728bc581770SLinus Walleij 72954d52573SStephen Boyd poison_init_mem(&__tcm_start, &__tcm_end - &__tcm_start); 730ea208f64SLinus Walleij totalram_pages += free_area(__phys_to_pfn(__pa(&__tcm_start)), 731ea208f64SLinus Walleij __phys_to_pfn(__pa(&__tcm_end)), 732bc581770SLinus Walleij "TCM link"); 733bc581770SLinus Walleij #endif 734bc581770SLinus Walleij 73554d52573SStephen Boyd poison_init_mem(__init_begin, __init_end - __init_begin); 7366db015e4SNicolas Pitre if (!machine_is_integrator() && !machine_is_cintegrator()) 73737efe642SRussell King totalram_pages += free_area(__phys_to_pfn(__pa(__init_begin)), 73837efe642SRussell King __phys_to_pfn(__pa(__init_end)), 7391da177e4SLinus Torvalds "init"); 7401da177e4SLinus Torvalds } 7411da177e4SLinus Torvalds 7421da177e4SLinus Torvalds #ifdef CONFIG_BLK_DEV_INITRD 7431da177e4SLinus Torvalds 7441da177e4SLinus Torvalds static int keep_initrd; 7451da177e4SLinus Torvalds 7461da177e4SLinus Torvalds void free_initrd_mem(unsigned long start, unsigned long end) 7471da177e4SLinus Torvalds { 74854d52573SStephen Boyd if (!keep_initrd) { 74954d52573SStephen Boyd poison_init_mem((void *)start, PAGE_ALIGN(end) - start); 7506db015e4SNicolas Pitre totalram_pages += free_area(__phys_to_pfn(__pa(start)), 7516db015e4SNicolas Pitre __phys_to_pfn(__pa(end)), 7526db015e4SNicolas Pitre "initrd"); 7531da177e4SLinus Torvalds } 75454d52573SStephen Boyd } 7551da177e4SLinus Torvalds 7561da177e4SLinus Torvalds static int __init keepinitrd_setup(char *__unused) 7571da177e4SLinus Torvalds { 7581da177e4SLinus Torvalds keep_initrd = 1; 7591da177e4SLinus Torvalds return 1; 7601da177e4SLinus Torvalds } 7611da177e4SLinus Torvalds 7621da177e4SLinus Torvalds __setup("keepinitrd", keepinitrd_setup); 7631da177e4SLinus Torvalds #endif 764