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> 23c7909509SMarek Szyprowski #include <linux/dma-contiguous.h> 24158e8bfeSAlessandro Rubini #include <linux/sizes.h> 251da177e4SLinus Torvalds 261da177e4SLinus Torvalds #include <asm/mach-types.h> 27716a3dc2SRussell King #include <asm/memblock.h> 2893c02ab4SGrant Likely #include <asm/prom.h> 2937efe642SRussell King #include <asm/sections.h> 301da177e4SLinus Torvalds #include <asm/setup.h> 311da177e4SLinus Torvalds #include <asm/tlb.h> 32db9ef1afSFenkart/Bostandzhyan #include <asm/fixmap.h> 331da177e4SLinus Torvalds 341da177e4SLinus Torvalds #include <asm/mach/arch.h> 351da177e4SLinus Torvalds #include <asm/mach/map.h> 361da177e4SLinus Torvalds 371b2e2b73SRussell King #include "mm.h" 381b2e2b73SRussell King 39de22cc6eSVitaly Andrianov static phys_addr_t phys_initrd_start __initdata = 0; 40012d1f4aSRussell King static unsigned long phys_initrd_size __initdata = 0; 41012d1f4aSRussell King 422b0d8c25SJeremy Kerr static int __init early_initrd(char *p) 43012d1f4aSRussell King { 44de22cc6eSVitaly Andrianov phys_addr_t start; 45de22cc6eSVitaly Andrianov unsigned long size; 462b0d8c25SJeremy Kerr char *endp; 47012d1f4aSRussell King 482b0d8c25SJeremy Kerr start = memparse(p, &endp); 492b0d8c25SJeremy Kerr if (*endp == ',') { 502b0d8c25SJeremy Kerr size = memparse(endp + 1, NULL); 51012d1f4aSRussell King 52012d1f4aSRussell King phys_initrd_start = start; 53012d1f4aSRussell King phys_initrd_size = size; 54012d1f4aSRussell King } 552b0d8c25SJeremy Kerr return 0; 56012d1f4aSRussell King } 572b0d8c25SJeremy Kerr early_param("initrd", early_initrd); 58012d1f4aSRussell King 59012d1f4aSRussell King static int __init parse_tag_initrd(const struct tag *tag) 60012d1f4aSRussell King { 61012d1f4aSRussell King printk(KERN_WARNING "ATAG_INITRD is deprecated; " 62012d1f4aSRussell King "please update your bootloader.\n"); 63012d1f4aSRussell King phys_initrd_start = __virt_to_phys(tag->u.initrd.start); 64012d1f4aSRussell King phys_initrd_size = tag->u.initrd.size; 65012d1f4aSRussell King return 0; 66012d1f4aSRussell King } 67012d1f4aSRussell King 68012d1f4aSRussell King __tagtable(ATAG_INITRD, parse_tag_initrd); 69012d1f4aSRussell King 70012d1f4aSRussell King static int __init parse_tag_initrd2(const struct tag *tag) 71012d1f4aSRussell King { 72012d1f4aSRussell King phys_initrd_start = tag->u.initrd.start; 73012d1f4aSRussell King phys_initrd_size = tag->u.initrd.size; 74012d1f4aSRussell King return 0; 75012d1f4aSRussell King } 76012d1f4aSRussell King 77012d1f4aSRussell King __tagtable(ATAG_INITRD2, parse_tag_initrd2); 781da177e4SLinus Torvalds 791da177e4SLinus Torvalds /* 804b5f32ceSNicolas Pitre * This keeps memory configuration data used by a couple memory 814b5f32ceSNicolas Pitre * initialization functions, as well as show_mem() for the skipping 824b5f32ceSNicolas Pitre * of holes in the memory map. It is populated by arm_add_memory(). 831da177e4SLinus Torvalds */ 84b2b755b5SDavid Rientjes void show_mem(unsigned int filter) 851da177e4SLinus Torvalds { 861da177e4SLinus Torvalds int free = 0, total = 0, reserved = 0; 871c2f87c2SLaura Abbott int shared = 0, cached = 0, slab = 0; 881c2f87c2SLaura Abbott struct memblock_region *reg; 891da177e4SLinus Torvalds 901da177e4SLinus Torvalds printk("Mem-info:\n"); 917bf02ea2SDavid Rientjes show_free_areas(filter); 92be370302SRussell King 931c2f87c2SLaura Abbott for_each_memblock (memory, reg) { 945e709827SRay Lehtiniemi unsigned int pfn1, pfn2; 951da177e4SLinus Torvalds struct page *page, *end; 961da177e4SLinus Torvalds 971c2f87c2SLaura Abbott pfn1 = memblock_region_memory_base_pfn(reg); 981c2f87c2SLaura Abbott pfn2 = memblock_region_memory_end_pfn(reg); 995e709827SRay Lehtiniemi 100ea056df7SCatalin Marinas page = pfn_to_page(pfn1); 101ea056df7SCatalin Marinas end = pfn_to_page(pfn2 - 1) + 1; 1021da177e4SLinus Torvalds 1031da177e4SLinus Torvalds do { 1041da177e4SLinus Torvalds total++; 1051da177e4SLinus Torvalds if (PageReserved(page)) 1061da177e4SLinus Torvalds reserved++; 1071da177e4SLinus Torvalds else if (PageSwapCache(page)) 1081da177e4SLinus Torvalds cached++; 1091da177e4SLinus Torvalds else if (PageSlab(page)) 1101da177e4SLinus Torvalds slab++; 1111da177e4SLinus Torvalds else if (!page_count(page)) 1121da177e4SLinus Torvalds free++; 1131da177e4SLinus Torvalds else 1141da177e4SLinus Torvalds shared += page_count(page) - 1; 1151c2f87c2SLaura Abbott pfn1++; 1161c2f87c2SLaura Abbott page = pfn_to_page(pfn1); 1171c2f87c2SLaura Abbott } while (pfn1 < pfn2); 1181da177e4SLinus Torvalds } 1191da177e4SLinus Torvalds 1201da177e4SLinus Torvalds printk("%d pages of RAM\n", total); 1211da177e4SLinus Torvalds printk("%d free pages\n", free); 1221da177e4SLinus Torvalds printk("%d reserved pages\n", reserved); 1231da177e4SLinus Torvalds printk("%d slab pages\n", slab); 1241da177e4SLinus Torvalds printk("%d pages shared\n", shared); 1251da177e4SLinus Torvalds printk("%d pages swap cached\n", cached); 1261da177e4SLinus Torvalds } 1271da177e4SLinus Torvalds 128f25b4b4cSRussell King static void __init find_limits(unsigned long *min, unsigned long *max_low, 129f25b4b4cSRussell King unsigned long *max_high) 130dde5828fSRussell King { 1311c2f87c2SLaura Abbott *max_low = PFN_DOWN(memblock_get_current_limit()); 1321c2f87c2SLaura Abbott *min = PFN_UP(memblock_start_of_DRAM()); 1331c2f87c2SLaura Abbott *max_high = PFN_DOWN(memblock_end_of_DRAM()); 134dde5828fSRussell King } 135dde5828fSRussell King 136be20902bSRussell King #ifdef CONFIG_ZONE_DMA 13765032018SNicolas Pitre 138364230b9SRob Herring phys_addr_t arm_dma_zone_size __read_mostly; 13965032018SNicolas Pitre EXPORT_SYMBOL(arm_dma_zone_size); 14065032018SNicolas Pitre 141022ae537SRussell King /* 142022ae537SRussell King * The DMA mask corresponding to the maximum bus address allocatable 143022ae537SRussell King * using GFP_DMA. The default here places no restriction on DMA 144022ae537SRussell King * allocations. This must be the smallest DMA mask in the system, 145022ae537SRussell King * so a successful GFP_DMA allocation will always satisfy this. 146022ae537SRussell King */ 1474986e5c7SMarek Szyprowski phys_addr_t arm_dma_limit; 1484dcfa600SRussell King unsigned long arm_dma_pfn_limit; 149022ae537SRussell King 150be20902bSRussell King static void __init arm_adjust_dma_zone(unsigned long *size, unsigned long *hole, 151be20902bSRussell King unsigned long dma_size) 152be20902bSRussell King { 153be20902bSRussell King if (size[0] <= dma_size) 154be20902bSRussell King return; 155be20902bSRussell King 156be20902bSRussell King size[ZONE_NORMAL] = size[0] - dma_size; 157be20902bSRussell King size[ZONE_DMA] = dma_size; 158be20902bSRussell King hole[ZONE_NORMAL] = hole[0]; 159be20902bSRussell King hole[ZONE_DMA] = 0; 160be20902bSRussell King } 161be20902bSRussell King #endif 162be20902bSRussell King 163ff69a4c8SRussell King void __init setup_dma_zone(const struct machine_desc *mdesc) 164c7909509SMarek Szyprowski { 165c7909509SMarek Szyprowski #ifdef CONFIG_ZONE_DMA 166c7909509SMarek Szyprowski if (mdesc->dma_zone_size) { 167c7909509SMarek Szyprowski arm_dma_zone_size = mdesc->dma_zone_size; 1686bcac805SRussell King arm_dma_limit = PHYS_OFFSET + arm_dma_zone_size - 1; 169c7909509SMarek Szyprowski } else 170c7909509SMarek Szyprowski arm_dma_limit = 0xffffffff; 1714dcfa600SRussell King arm_dma_pfn_limit = arm_dma_limit >> PAGE_SHIFT; 172c7909509SMarek Szyprowski #endif 173c7909509SMarek Szyprowski } 174c7909509SMarek Szyprowski 17584f452b1SSantosh Shilimkar static void __init zone_sizes_init(unsigned long min, unsigned long max_low, 176a2c54d2aSRussell King unsigned long max_high) 177b7a69ac3SRussell King { 178b7a69ac3SRussell King unsigned long zone_size[MAX_NR_ZONES], zhole_size[MAX_NR_ZONES]; 179a2c54d2aSRussell King struct memblock_region *reg; 180b7a69ac3SRussell King 18190072059SRussell King /* 182be370302SRussell King * initialise the zones. 18390072059SRussell King */ 18490072059SRussell King memset(zone_size, 0, sizeof(zone_size)); 18590072059SRussell King 18690072059SRussell King /* 187be370302SRussell King * The memory size has already been determined. If we need 188be370302SRussell King * to do anything fancy with the allocation of this memory 189be370302SRussell King * to the zones, now is the time to do it. 19090072059SRussell King */ 191dde5828fSRussell King zone_size[0] = max_low - min; 192dde5828fSRussell King #ifdef CONFIG_HIGHMEM 193dde5828fSRussell King zone_size[ZONE_HIGHMEM] = max_high - max_low; 194dde5828fSRussell King #endif 19590072059SRussell King 19690072059SRussell King /* 197be370302SRussell King * Calculate the size of the holes. 198be370302SRussell King * holes = node_size - sum(bank_sizes) 19990072059SRussell King */ 200dde5828fSRussell King memcpy(zhole_size, zone_size, sizeof(zhole_size)); 201a2c54d2aSRussell King for_each_memblock(memory, reg) { 202a2c54d2aSRussell King unsigned long start = memblock_region_memory_base_pfn(reg); 203a2c54d2aSRussell King unsigned long end = memblock_region_memory_end_pfn(reg); 204a2c54d2aSRussell King 205a2c54d2aSRussell King if (start < max_low) { 206a2c54d2aSRussell King unsigned long low_end = min(end, max_low); 207a2c54d2aSRussell King zhole_size[0] -= low_end - start; 208a2c54d2aSRussell King } 209dde5828fSRussell King #ifdef CONFIG_HIGHMEM 210a2c54d2aSRussell King if (end > max_low) { 211a2c54d2aSRussell King unsigned long high_start = max(start, max_low); 212a2c54d2aSRussell King zhole_size[ZONE_HIGHMEM] -= end - high_start; 213a2c54d2aSRussell King } 214dde5828fSRussell King #endif 215dde5828fSRussell King } 21690072059SRussell King 21765032018SNicolas Pitre #ifdef CONFIG_ZONE_DMA 21890072059SRussell King /* 21990072059SRussell King * Adjust the sizes according to any special requirements for 22090072059SRussell King * this machine type. 22190072059SRussell King */ 222c7909509SMarek Szyprowski if (arm_dma_zone_size) 223be20902bSRussell King arm_adjust_dma_zone(zone_size, zhole_size, 22465032018SNicolas Pitre arm_dma_zone_size >> PAGE_SHIFT); 225be20902bSRussell King #endif 22690072059SRussell King 227be370302SRussell King free_area_init_node(0, zone_size, min, zhole_size); 22890072059SRussell King } 22990072059SRussell King 2307b7bf499SWill Deacon #ifdef CONFIG_HAVE_ARCH_PFN_VALID 231b7cfda9fSRussell King int pfn_valid(unsigned long pfn) 232b7cfda9fSRussell King { 233fb492c91SMark Rutland return memblock_is_memory(__pfn_to_phys(pfn)); 234b7cfda9fSRussell King } 235b7cfda9fSRussell King EXPORT_SYMBOL(pfn_valid); 2367b7bf499SWill Deacon #endif 237657e12fdSRussell King 2387b7bf499SWill Deacon #ifndef CONFIG_SPARSEMEM 23914904927SStephen Boyd static void __init arm_memory_present(void) 240657e12fdSRussell King { 241657e12fdSRussell King } 242657e12fdSRussell King #else 24314904927SStephen Boyd static void __init arm_memory_present(void) 244657e12fdSRussell King { 245719c1514SBenjamin Herrenschmidt struct memblock_region *reg; 246719c1514SBenjamin Herrenschmidt 2477c996361SYinghai Lu for_each_memblock(memory, reg) 248c7fc2de0SYinghai Lu memory_present(0, memblock_region_memory_base_pfn(reg), 249c7fc2de0SYinghai Lu memblock_region_memory_end_pfn(reg)); 250657e12fdSRussell King } 251b7cfda9fSRussell King #endif 252b7cfda9fSRussell King 253716a3dc2SRussell King static bool arm_memblock_steal_permitted = true; 254716a3dc2SRussell King 255bc2827d0SRussell King phys_addr_t __init arm_memblock_steal(phys_addr_t size, phys_addr_t align) 256716a3dc2SRussell King { 257716a3dc2SRussell King phys_addr_t phys; 258716a3dc2SRussell King 259716a3dc2SRussell King BUG_ON(!arm_memblock_steal_permitted); 260716a3dc2SRussell King 2617ac68a4cSRussell King phys = memblock_alloc_base(size, align, MEMBLOCK_ALLOC_ANYWHERE); 262716a3dc2SRussell King memblock_free(phys, size); 263716a3dc2SRussell King memblock_remove(phys, size); 264716a3dc2SRussell King 265716a3dc2SRussell King return phys; 266716a3dc2SRussell King } 267716a3dc2SRussell King 2681c2f87c2SLaura Abbott void __init arm_memblock_init(const struct machine_desc *mdesc) 2692778f620SRussell King { 2702778f620SRussell King /* Register the kernel text, kernel data and initrd with memblock. */ 2712778f620SRussell King #ifdef CONFIG_XIP_KERNEL 272842eab40SRussell King memblock_reserve(__pa(_sdata), _end - _sdata); 2732778f620SRussell King #else 2742778f620SRussell King memblock_reserve(__pa(_stext), _end - _stext); 2752778f620SRussell King #endif 2762778f620SRussell King #ifdef CONFIG_BLK_DEV_INITRD 27765939301SRob Herring /* FDT scan will populate initrd_start */ 2784c235cb9SBen Peddell if (initrd_start && !phys_initrd_size) { 27965939301SRob Herring phys_initrd_start = __virt_to_phys(initrd_start); 28065939301SRob Herring phys_initrd_size = initrd_end - initrd_start; 28165939301SRob Herring } 2824c235cb9SBen Peddell initrd_start = initrd_end = 0; 283b0a2679dSRussell King if (phys_initrd_size && 2848f4b8c76SRussell King !memblock_is_region_memory(phys_initrd_start, phys_initrd_size)) { 285de22cc6eSVitaly Andrianov pr_err("INITRD: 0x%08llx+0x%08lx is not a memory region - disabling initrd\n", 286de22cc6eSVitaly Andrianov (u64)phys_initrd_start, phys_initrd_size); 2878f4b8c76SRussell King phys_initrd_start = phys_initrd_size = 0; 2888f4b8c76SRussell King } 2898f4b8c76SRussell King if (phys_initrd_size && 290b0a2679dSRussell King memblock_is_region_reserved(phys_initrd_start, phys_initrd_size)) { 291de22cc6eSVitaly Andrianov pr_err("INITRD: 0x%08llx+0x%08lx overlaps in-use memory region - disabling initrd\n", 292de22cc6eSVitaly Andrianov (u64)phys_initrd_start, phys_initrd_size); 293b0a2679dSRussell King phys_initrd_start = phys_initrd_size = 0; 294b0a2679dSRussell King } 2952778f620SRussell King if (phys_initrd_size) { 2962778f620SRussell King memblock_reserve(phys_initrd_start, phys_initrd_size); 2972778f620SRussell King 2982778f620SRussell King /* Now convert initrd to virtual addresses */ 2992778f620SRussell King initrd_start = __phys_to_virt(phys_initrd_start); 3002778f620SRussell King initrd_end = initrd_start + phys_initrd_size; 3012778f620SRussell King } 3022778f620SRussell King #endif 3032778f620SRussell King 3042778f620SRussell King arm_mm_memblock_reserve(); 30593c02ab4SGrant Likely arm_dt_memblock_reserve(); 3062778f620SRussell King 3078d717a52SRussell King /* reserve any platform specific memblock areas */ 3088d717a52SRussell King if (mdesc->reserve) 3098d717a52SRussell King mdesc->reserve(); 3108d717a52SRussell King 311bcedb5f9SMarek Szyprowski early_init_fdt_scan_reserved_mem(); 312bcedb5f9SMarek Szyprowski 313c7909509SMarek Szyprowski /* 314c7909509SMarek Szyprowski * reserve memory for DMA contigouos allocations, 315c7909509SMarek Szyprowski * must come from DMA area inside low memory 316c7909509SMarek Szyprowski */ 317c7909509SMarek Szyprowski dma_contiguous_reserve(min(arm_dma_limit, arm_lowmem_limit)); 318c7909509SMarek Szyprowski 319716a3dc2SRussell King arm_memblock_steal_permitted = false; 3202778f620SRussell King memblock_dump_all(); 3212778f620SRussell King } 3222778f620SRussell King 3238d717a52SRussell King void __init bootmem_init(void) 32490072059SRussell King { 325dde5828fSRussell King unsigned long min, max_low, max_high; 32690072059SRussell King 3278e58caefSGrygorii Strashko memblock_allow_resize(); 328dde5828fSRussell King max_low = max_high = 0; 329dde5828fSRussell King 330f25b4b4cSRussell King find_limits(&min, &max_low, &max_high); 331dde5828fSRussell King 332b7a69ac3SRussell King /* 333657e12fdSRussell King * Sparsemem tries to allocate bootmem in memory_present(), 334657e12fdSRussell King * so must be done after the fixed reservations 335657e12fdSRussell King */ 336eda2e5dcSRussell King arm_memory_present(); 33790072059SRussell King 338b7a69ac3SRussell King /* 339b7a69ac3SRussell King * sparse_init() needs the bootmem allocator up and running. 340b7a69ac3SRussell King */ 341b7a69ac3SRussell King sparse_init(); 342b7a69ac3SRussell King 343b7a69ac3SRussell King /* 344be370302SRussell King * Now free the memory - free_area_init_node needs 345b7a69ac3SRussell King * the sparse mem_map arrays initialized by sparse_init() 346b7a69ac3SRussell King * for memmap_init_zone(), otherwise all PFNs are invalid. 347b7a69ac3SRussell King */ 34884f452b1SSantosh Shilimkar zone_sizes_init(min, max_low, max_high); 349b7a69ac3SRussell King 35090072059SRussell King /* 35190072059SRussell King * This doesn't seem to be used by the Linux memory manager any 35290072059SRussell King * more, but is used by ll_rw_block. If we can get rid of it, we 35390072059SRussell King * also get rid of some of the stuff above as well. 35490072059SRussell King */ 35526ba47b1SSantosh Shilimkar min_low_pfn = min; 35626ba47b1SSantosh Shilimkar max_low_pfn = max_low; 35726ba47b1SSantosh Shilimkar max_pfn = max_high; 35890072059SRussell King } 35990072059SRussell King 36054d52573SStephen Boyd /* 36154d52573SStephen Boyd * Poison init memory with an undefined instruction (ARM) or a branch to an 36254d52573SStephen Boyd * undefined instruction (Thumb). 36354d52573SStephen Boyd */ 36454d52573SStephen Boyd static inline void poison_init_mem(void *s, size_t count) 36554d52573SStephen Boyd { 36654d52573SStephen Boyd u32 *p = (u32 *)s; 367bf912d99SJamie Iles for (; count != 0; count -= 4) 36854d52573SStephen Boyd *p++ = 0xe7fddef0; 36954d52573SStephen Boyd } 37054d52573SStephen Boyd 371a013053dSRussell King static inline void 372be370302SRussell King free_memmap(unsigned long start_pfn, unsigned long end_pfn) 373a013053dSRussell King { 374a013053dSRussell King struct page *start_pg, *end_pg; 37556bc6286SVitaly Andrianov phys_addr_t pg, pgend; 376a013053dSRussell King 377a013053dSRussell King /* 378a013053dSRussell King * Convert start_pfn/end_pfn to a struct page pointer. 379a013053dSRussell King */ 3803257f43dSCatalin Marinas start_pg = pfn_to_page(start_pfn - 1) + 1; 3819af386c8SWill Deacon end_pg = pfn_to_page(end_pfn - 1) + 1; 382a013053dSRussell King 383a013053dSRussell King /* 384a013053dSRussell King * Convert to physical addresses, and 385a013053dSRussell King * round start upwards and end downwards. 386a013053dSRussell King */ 38756bc6286SVitaly Andrianov pg = PAGE_ALIGN(__pa(start_pg)); 38856bc6286SVitaly Andrianov pgend = __pa(end_pg) & PAGE_MASK; 389a013053dSRussell King 390a013053dSRussell King /* 391a013053dSRussell King * If there are free pages between these, 392a013053dSRussell King * free the section of the memmap array. 393a013053dSRussell King */ 394a013053dSRussell King if (pg < pgend) 395cfb66586SSantosh Shilimkar memblock_free_early(pg, pgend - pg); 396a013053dSRussell King } 397a013053dSRussell King 398a013053dSRussell King /* 399a013053dSRussell King * The mem_map array can get very big. Free the unused area of the memory map. 400a013053dSRussell King */ 4011c2f87c2SLaura Abbott static void __init free_unused_memmap(void) 402a013053dSRussell King { 4031c2f87c2SLaura Abbott unsigned long start, prev_end = 0; 4041c2f87c2SLaura Abbott struct memblock_region *reg; 405a013053dSRussell King 406a013053dSRussell King /* 4073260e529SMichael Bohan * This relies on each bank being in address order. 4083260e529SMichael Bohan * The banks are sorted previously in bootmem_init(). 409a013053dSRussell King */ 4101c2f87c2SLaura Abbott for_each_memblock(memory, reg) { 4111c2f87c2SLaura Abbott start = memblock_region_memory_base_pfn(reg); 412a013053dSRussell King 4139af386c8SWill Deacon #ifdef CONFIG_SPARSEMEM 4149af386c8SWill Deacon /* 4159af386c8SWill Deacon * Take care not to free memmap entries that don't exist 4169af386c8SWill Deacon * due to SPARSEMEM sections which aren't present. 4179af386c8SWill Deacon */ 4181c2f87c2SLaura Abbott start = min(start, 4191c2f87c2SLaura Abbott ALIGN(prev_end, PAGES_PER_SECTION)); 420002ea9eeSLinus Walleij #else 421002ea9eeSLinus Walleij /* 422002ea9eeSLinus Walleij * Align down here since the VM subsystem insists that the 423002ea9eeSLinus Walleij * memmap entries are valid from the bank start aligned to 424002ea9eeSLinus Walleij * MAX_ORDER_NR_PAGES. 425002ea9eeSLinus Walleij */ 4261c2f87c2SLaura Abbott start = round_down(start, MAX_ORDER_NR_PAGES); 4279af386c8SWill Deacon #endif 428a013053dSRussell King /* 429a013053dSRussell King * If we had a previous bank, and there is a space 430a013053dSRussell King * between the current bank and the previous, free it. 431a013053dSRussell King */ 4321c2f87c2SLaura Abbott if (prev_end && prev_end < start) 4331c2f87c2SLaura Abbott free_memmap(prev_end, start); 434a013053dSRussell King 4353260e529SMichael Bohan /* 4363260e529SMichael Bohan * Align up here since the VM subsystem insists that the 4373260e529SMichael Bohan * memmap entries are valid from the bank end aligned to 4383260e529SMichael Bohan * MAX_ORDER_NR_PAGES. 4393260e529SMichael Bohan */ 4401c2f87c2SLaura Abbott prev_end = ALIGN(memblock_region_memory_end_pfn(reg), 4411c2f87c2SLaura Abbott MAX_ORDER_NR_PAGES); 442a013053dSRussell King } 4439af386c8SWill Deacon 4449af386c8SWill Deacon #ifdef CONFIG_SPARSEMEM 4451c2f87c2SLaura Abbott if (!IS_ALIGNED(prev_end, PAGES_PER_SECTION)) 4461c2f87c2SLaura Abbott free_memmap(prev_end, 4471c2f87c2SLaura Abbott ALIGN(prev_end, PAGES_PER_SECTION)); 4489af386c8SWill Deacon #endif 449a013053dSRussell King } 450a013053dSRussell King 45183db0384SJiang Liu #ifdef CONFIG_HIGHMEM 45283db0384SJiang Liu static inline void free_area_high(unsigned long pfn, unsigned long end) 45383db0384SJiang Liu { 454dd6911efSJiang Liu for (; pfn < end; pfn++) 455dd6911efSJiang Liu free_highmem_page(pfn_to_page(pfn)); 45683db0384SJiang Liu } 45783db0384SJiang Liu #endif 45883db0384SJiang Liu 459d0e775afSRussell King static void __init free_highpages(void) 460d0e775afSRussell King { 461d0e775afSRussell King #ifdef CONFIG_HIGHMEM 46226ba47b1SSantosh Shilimkar unsigned long max_low = max_low_pfn; 463df4f14c7SRussell King struct memblock_region *mem, *res; 464d0e775afSRussell King 465d0e775afSRussell King /* set highmem page free */ 466df4f14c7SRussell King for_each_memblock(memory, mem) { 467df4f14c7SRussell King unsigned long start = memblock_region_memory_base_pfn(mem); 468df4f14c7SRussell King unsigned long end = memblock_region_memory_end_pfn(mem); 469df4f14c7SRussell King 470df4f14c7SRussell King /* Ignore complete lowmem entries */ 471df4f14c7SRussell King if (end <= max_low) 472df4f14c7SRussell King continue; 473df4f14c7SRussell King 474df4f14c7SRussell King /* Truncate partial highmem entries */ 475df4f14c7SRussell King if (start < max_low) 476df4f14c7SRussell King start = max_low; 477df4f14c7SRussell King 478df4f14c7SRussell King /* Find and exclude any reserved regions */ 479df4f14c7SRussell King for_each_memblock(reserved, res) { 480df4f14c7SRussell King unsigned long res_start, res_end; 481df4f14c7SRussell King 482df4f14c7SRussell King res_start = memblock_region_reserved_base_pfn(res); 483df4f14c7SRussell King res_end = memblock_region_reserved_end_pfn(res); 484df4f14c7SRussell King 485df4f14c7SRussell King if (res_end < start) 486df4f14c7SRussell King continue; 487df4f14c7SRussell King if (res_start < start) 488df4f14c7SRussell King res_start = start; 489df4f14c7SRussell King if (res_start > end) 490df4f14c7SRussell King res_start = end; 491df4f14c7SRussell King if (res_end > end) 492df4f14c7SRussell King res_end = end; 493df4f14c7SRussell King if (res_start != start) 49483db0384SJiang Liu free_area_high(start, res_start); 495df4f14c7SRussell King start = res_end; 496df4f14c7SRussell King if (start == end) 497df4f14c7SRussell King break; 498df4f14c7SRussell King } 499df4f14c7SRussell King 500df4f14c7SRussell King /* And now free anything which remains */ 501df4f14c7SRussell King if (start < end) 50283db0384SJiang Liu free_area_high(start, end); 503d0e775afSRussell King } 504d0e775afSRussell King #endif 505d0e775afSRussell King } 506d0e775afSRussell King 5071da177e4SLinus Torvalds /* 5081da177e4SLinus Torvalds * mem_init() marks the free areas in the mem_map and tells us how much 5091da177e4SLinus Torvalds * memory is free. This is done after various parts of the system have 5101da177e4SLinus Torvalds * claimed their memory after the kernel image. 5111da177e4SLinus Torvalds */ 5121da177e4SLinus Torvalds void __init mem_init(void) 5131da177e4SLinus Torvalds { 5141dbd30e9SLinus Walleij #ifdef CONFIG_HAVE_TCM 5151dbd30e9SLinus Walleij /* These pointers are filled in on TCM detection */ 5161dbd30e9SLinus Walleij extern u32 dtcm_end; 5171dbd30e9SLinus Walleij extern u32 itcm_end; 5181dbd30e9SLinus Walleij #endif 5191da177e4SLinus Torvalds 520b3ba41f2SSantosh Shilimkar set_max_mapnr(pfn_to_page(max_pfn) - mem_map); 5211da177e4SLinus Torvalds 5221da177e4SLinus Torvalds /* this will put all unused low memory onto the freelists */ 5231c2f87c2SLaura Abbott free_unused_memmap(); 5240c988534SJiang Liu free_all_bootmem(); 5251da177e4SLinus Torvalds 5261da177e4SLinus Torvalds #ifdef CONFIG_SA1111 5271da177e4SLinus Torvalds /* now that our DMA memory is actually so designated, we can free it */ 528bfd65dd9SLinus Torvalds free_reserved_area(__va(PHYS_OFFSET), swapper_pg_dir, -1, NULL); 5291da177e4SLinus Torvalds #endif 5301da177e4SLinus Torvalds 531d0e775afSRussell King free_highpages(); 5323835f6cbSNicolas Pitre 5332450c973SJiang Liu mem_init_print_info(NULL); 5341da177e4SLinus Torvalds 535db9ef1afSFenkart/Bostandzhyan #define MLK(b, t) b, t, ((t) - (b)) >> 10 536db9ef1afSFenkart/Bostandzhyan #define MLM(b, t) b, t, ((t) - (b)) >> 20 537db9ef1afSFenkart/Bostandzhyan #define MLK_ROUNDUP(b, t) b, t, DIV_ROUND_UP(((t) - (b)), SZ_1K) 538db9ef1afSFenkart/Bostandzhyan 539db9ef1afSFenkart/Bostandzhyan printk(KERN_NOTICE "Virtual kernel memory layout:\n" 540db9ef1afSFenkart/Bostandzhyan " vector : 0x%08lx - 0x%08lx (%4ld kB)\n" 54107d2a5c7SLinus Walleij #ifdef CONFIG_HAVE_TCM 54207d2a5c7SLinus Walleij " DTCM : 0x%08lx - 0x%08lx (%4ld kB)\n" 54307d2a5c7SLinus Walleij " ITCM : 0x%08lx - 0x%08lx (%4ld kB)\n" 54407d2a5c7SLinus Walleij #endif 545db9ef1afSFenkart/Bostandzhyan " fixmap : 0x%08lx - 0x%08lx (%4ld kB)\n" 546db9ef1afSFenkart/Bostandzhyan " vmalloc : 0x%08lx - 0x%08lx (%4ld MB)\n" 547db9ef1afSFenkart/Bostandzhyan " lowmem : 0x%08lx - 0x%08lx (%4ld MB)\n" 548db9ef1afSFenkart/Bostandzhyan #ifdef CONFIG_HIGHMEM 549db9ef1afSFenkart/Bostandzhyan " pkmap : 0x%08lx - 0x%08lx (%4ld MB)\n" 550db9ef1afSFenkart/Bostandzhyan #endif 551d9277d51SUwe Kleine-König #ifdef CONFIG_MODULES 552db9ef1afSFenkart/Bostandzhyan " modules : 0x%08lx - 0x%08lx (%4ld MB)\n" 553d9277d51SUwe Kleine-König #endif 554db9ef1afSFenkart/Bostandzhyan " .text : 0x%p" " - 0x%p" " (%4d kB)\n" 5553835d69aSRussell King " .init : 0x%p" " - 0x%p" " (%4d kB)\n" 55645f6d7e0SRabin Vincent " .data : 0x%p" " - 0x%p" " (%4d kB)\n" 55745f6d7e0SRabin Vincent " .bss : 0x%p" " - 0x%p" " (%4d kB)\n", 558db9ef1afSFenkart/Bostandzhyan 559db9ef1afSFenkart/Bostandzhyan MLK(UL(CONFIG_VECTORS_BASE), UL(CONFIG_VECTORS_BASE) + 560db9ef1afSFenkart/Bostandzhyan (PAGE_SIZE)), 56107d2a5c7SLinus Walleij #ifdef CONFIG_HAVE_TCM 5621dbd30e9SLinus Walleij MLK(DTCM_OFFSET, (unsigned long) dtcm_end), 5631dbd30e9SLinus Walleij MLK(ITCM_OFFSET, (unsigned long) itcm_end), 56407d2a5c7SLinus Walleij #endif 565db9ef1afSFenkart/Bostandzhyan MLK(FIXADDR_START, FIXADDR_TOP), 566c931b4f6SFenkart/Bostandzhyan MLM(VMALLOC_START, VMALLOC_END), 567db9ef1afSFenkart/Bostandzhyan MLM(PAGE_OFFSET, (unsigned long)high_memory), 568db9ef1afSFenkart/Bostandzhyan #ifdef CONFIG_HIGHMEM 569db9ef1afSFenkart/Bostandzhyan MLM(PKMAP_BASE, (PKMAP_BASE) + (LAST_PKMAP) * 570db9ef1afSFenkart/Bostandzhyan (PAGE_SIZE)), 571db9ef1afSFenkart/Bostandzhyan #endif 572d9277d51SUwe Kleine-König #ifdef CONFIG_MODULES 573db9ef1afSFenkart/Bostandzhyan MLM(MODULES_VADDR, MODULES_END), 574d9277d51SUwe Kleine-König #endif 575db9ef1afSFenkart/Bostandzhyan 576db9ef1afSFenkart/Bostandzhyan MLK_ROUNDUP(_text, _etext), 5773835d69aSRussell King MLK_ROUNDUP(__init_begin, __init_end), 57845f6d7e0SRabin Vincent MLK_ROUNDUP(_sdata, _edata), 57945f6d7e0SRabin Vincent MLK_ROUNDUP(__bss_start, __bss_stop)); 580db9ef1afSFenkart/Bostandzhyan 581db9ef1afSFenkart/Bostandzhyan #undef MLK 582db9ef1afSFenkart/Bostandzhyan #undef MLM 583db9ef1afSFenkart/Bostandzhyan #undef MLK_ROUNDUP 584db9ef1afSFenkart/Bostandzhyan 585a1839272SFenkart/Bostandzhyan /* 586a1839272SFenkart/Bostandzhyan * Check boundaries twice: Some fundamental inconsistencies can 587a1839272SFenkart/Bostandzhyan * be detected at build time already. 588a1839272SFenkart/Bostandzhyan */ 589a1839272SFenkart/Bostandzhyan #ifdef CONFIG_MMU 590a1839272SFenkart/Bostandzhyan BUILD_BUG_ON(TASK_SIZE > MODULES_VADDR); 591a1839272SFenkart/Bostandzhyan BUG_ON(TASK_SIZE > MODULES_VADDR); 592a1839272SFenkart/Bostandzhyan #endif 593a1839272SFenkart/Bostandzhyan 594a1839272SFenkart/Bostandzhyan #ifdef CONFIG_HIGHMEM 595a1839272SFenkart/Bostandzhyan BUILD_BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE > PAGE_OFFSET); 596a1839272SFenkart/Bostandzhyan BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE > PAGE_OFFSET); 597a1839272SFenkart/Bostandzhyan #endif 598a1839272SFenkart/Bostandzhyan 5992450c973SJiang Liu if (PAGE_SIZE >= 16384 && get_num_physpages() <= 128) { 6001da177e4SLinus Torvalds extern int sysctl_overcommit_memory; 6011da177e4SLinus Torvalds /* 6021da177e4SLinus Torvalds * On a machine this small we won't get 6031da177e4SLinus Torvalds * anywhere without overcommit, so turn 6041da177e4SLinus Torvalds * it on by default. 6051da177e4SLinus Torvalds */ 6061da177e4SLinus Torvalds sysctl_overcommit_memory = OVERCOMMIT_ALWAYS; 6071da177e4SLinus Torvalds } 6081da177e4SLinus Torvalds } 6091da177e4SLinus Torvalds 6101da177e4SLinus Torvalds void free_initmem(void) 6111da177e4SLinus Torvalds { 612bc581770SLinus Walleij #ifdef CONFIG_HAVE_TCM 613ea208f64SLinus Walleij extern char __tcm_start, __tcm_end; 614bc581770SLinus Walleij 61554d52573SStephen Boyd poison_init_mem(&__tcm_start, &__tcm_end - &__tcm_start); 616dbe67df4SJiang Liu free_reserved_area(&__tcm_start, &__tcm_end, -1, "TCM link"); 617bc581770SLinus Walleij #endif 618bc581770SLinus Walleij 61954d52573SStephen Boyd poison_init_mem(__init_begin, __init_end - __init_begin); 6206db015e4SNicolas Pitre if (!machine_is_integrator() && !machine_is_cintegrator()) 621dbe67df4SJiang Liu free_initmem_default(-1); 6221da177e4SLinus Torvalds } 6231da177e4SLinus Torvalds 6241da177e4SLinus Torvalds #ifdef CONFIG_BLK_DEV_INITRD 6251da177e4SLinus Torvalds 6261da177e4SLinus Torvalds static int keep_initrd; 6271da177e4SLinus Torvalds 6281da177e4SLinus Torvalds void free_initrd_mem(unsigned long start, unsigned long end) 6291da177e4SLinus Torvalds { 63054d52573SStephen Boyd if (!keep_initrd) { 63154d52573SStephen Boyd poison_init_mem((void *)start, PAGE_ALIGN(end) - start); 632dbe67df4SJiang Liu free_reserved_area((void *)start, (void *)end, -1, "initrd"); 6331da177e4SLinus Torvalds } 63454d52573SStephen Boyd } 6351da177e4SLinus Torvalds 6361da177e4SLinus Torvalds static int __init keepinitrd_setup(char *__unused) 6371da177e4SLinus Torvalds { 6381da177e4SLinus Torvalds keep_initrd = 1; 6391da177e4SLinus Torvalds return 1; 6401da177e4SLinus Torvalds } 6411da177e4SLinus Torvalds 6421da177e4SLinus Torvalds __setup("keepinitrd", keepinitrd_setup); 6431da177e4SLinus Torvalds #endif 644