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/config.h> 111da177e4SLinus Torvalds #include <linux/kernel.h> 121da177e4SLinus Torvalds #include <linux/errno.h> 131da177e4SLinus Torvalds #include <linux/ptrace.h> 141da177e4SLinus Torvalds #include <linux/swap.h> 151da177e4SLinus Torvalds #include <linux/init.h> 161da177e4SLinus Torvalds #include <linux/bootmem.h> 171da177e4SLinus Torvalds #include <linux/mman.h> 181da177e4SLinus Torvalds #include <linux/nodemask.h> 191da177e4SLinus Torvalds #include <linux/initrd.h> 201da177e4SLinus Torvalds 211da177e4SLinus Torvalds #include <asm/mach-types.h> 221da177e4SLinus Torvalds #include <asm/hardware.h> 231da177e4SLinus Torvalds #include <asm/setup.h> 241da177e4SLinus Torvalds #include <asm/tlb.h> 251da177e4SLinus Torvalds 261da177e4SLinus Torvalds #include <asm/mach/arch.h> 271da177e4SLinus Torvalds #include <asm/mach/map.h> 281da177e4SLinus Torvalds 291da177e4SLinus Torvalds #define TABLE_SIZE (2 * PTRS_PER_PTE * sizeof(pte_t)) 301da177e4SLinus Torvalds 311da177e4SLinus Torvalds DEFINE_PER_CPU(struct mmu_gather, mmu_gathers); 321da177e4SLinus Torvalds 331da177e4SLinus Torvalds extern pgd_t swapper_pg_dir[PTRS_PER_PGD]; 341da177e4SLinus Torvalds extern void _stext, _text, _etext, __data_start, _end, __init_begin, __init_end; 351da177e4SLinus Torvalds extern unsigned long phys_initrd_start; 361da177e4SLinus Torvalds extern unsigned long phys_initrd_size; 371da177e4SLinus Torvalds 381da177e4SLinus Torvalds /* 391da177e4SLinus Torvalds * The sole use of this is to pass memory configuration 401da177e4SLinus Torvalds * data from paging_init to mem_init. 411da177e4SLinus Torvalds */ 421da177e4SLinus Torvalds static struct meminfo meminfo __initdata = { 0, }; 431da177e4SLinus Torvalds 441da177e4SLinus Torvalds /* 451da177e4SLinus Torvalds * empty_zero_page is a special page that is used for 461da177e4SLinus Torvalds * zero-initialized data and COW. 471da177e4SLinus Torvalds */ 481da177e4SLinus Torvalds struct page *empty_zero_page; 491da177e4SLinus Torvalds 501da177e4SLinus Torvalds void show_mem(void) 511da177e4SLinus Torvalds { 521da177e4SLinus Torvalds int free = 0, total = 0, reserved = 0; 531da177e4SLinus Torvalds int shared = 0, cached = 0, slab = 0, node; 541da177e4SLinus Torvalds 551da177e4SLinus Torvalds printk("Mem-info:\n"); 561da177e4SLinus Torvalds show_free_areas(); 571da177e4SLinus Torvalds printk("Free swap: %6ldkB\n", nr_swap_pages<<(PAGE_SHIFT-10)); 581da177e4SLinus Torvalds 591da177e4SLinus Torvalds for_each_online_node(node) { 601da177e4SLinus Torvalds struct page *page, *end; 611da177e4SLinus Torvalds 621da177e4SLinus Torvalds page = NODE_MEM_MAP(node); 631da177e4SLinus Torvalds end = page + NODE_DATA(node)->node_spanned_pages; 641da177e4SLinus Torvalds 651da177e4SLinus Torvalds do { 661da177e4SLinus Torvalds total++; 671da177e4SLinus Torvalds if (PageReserved(page)) 681da177e4SLinus Torvalds reserved++; 691da177e4SLinus Torvalds else if (PageSwapCache(page)) 701da177e4SLinus Torvalds cached++; 711da177e4SLinus Torvalds else if (PageSlab(page)) 721da177e4SLinus Torvalds slab++; 731da177e4SLinus Torvalds else if (!page_count(page)) 741da177e4SLinus Torvalds free++; 751da177e4SLinus Torvalds else 761da177e4SLinus Torvalds shared += page_count(page) - 1; 771da177e4SLinus Torvalds page++; 781da177e4SLinus Torvalds } while (page < end); 791da177e4SLinus Torvalds } 801da177e4SLinus Torvalds 811da177e4SLinus Torvalds printk("%d pages of RAM\n", total); 821da177e4SLinus Torvalds printk("%d free pages\n", free); 831da177e4SLinus Torvalds printk("%d reserved pages\n", reserved); 841da177e4SLinus Torvalds printk("%d slab pages\n", slab); 851da177e4SLinus Torvalds printk("%d pages shared\n", shared); 861da177e4SLinus Torvalds printk("%d pages swap cached\n", cached); 871da177e4SLinus Torvalds } 881da177e4SLinus Torvalds 8990072059SRussell King static inline pmd_t *pmd_off(pgd_t *pgd, unsigned long virt) 9090072059SRussell King { 9190072059SRussell King return pmd_offset(pgd, virt); 9290072059SRussell King } 931da177e4SLinus Torvalds 9490072059SRussell King static inline pmd_t *pmd_off_k(unsigned long virt) 9590072059SRussell King { 9690072059SRussell King return pmd_off(pgd_offset_k(virt), virt); 9790072059SRussell King } 9890072059SRussell King 9990072059SRussell King #define for_each_nodebank(iter,mi,no) \ 10090072059SRussell King for (iter = 0; iter < mi->nr_banks; iter++) \ 10190072059SRussell King if (mi->bank[iter].node == no) 1021da177e4SLinus Torvalds 1031da177e4SLinus Torvalds /* 1041da177e4SLinus Torvalds * FIXME: We really want to avoid allocating the bootmap bitmap 1051da177e4SLinus Torvalds * over the top of the initrd. Hopefully, this is located towards 1061da177e4SLinus Torvalds * the start of a bank, so if we allocate the bootmap bitmap at 1071da177e4SLinus Torvalds * the end, we won't clash. 1081da177e4SLinus Torvalds */ 1091da177e4SLinus Torvalds static unsigned int __init 1101da177e4SLinus Torvalds find_bootmap_pfn(int node, struct meminfo *mi, unsigned int bootmap_pages) 1111da177e4SLinus Torvalds { 1121da177e4SLinus Torvalds unsigned int start_pfn, bank, bootmap_pfn; 1131da177e4SLinus Torvalds 11490072059SRussell King start_pfn = PAGE_ALIGN(__pa(&_end)) >> PAGE_SHIFT; 1151da177e4SLinus Torvalds bootmap_pfn = 0; 1161da177e4SLinus Torvalds 11790072059SRussell King for_each_nodebank(bank, mi, node) { 1181da177e4SLinus Torvalds unsigned int start, end; 1191da177e4SLinus Torvalds 12092a8cbedSRussell King start = mi->bank[bank].start >> PAGE_SHIFT; 12192a8cbedSRussell King end = (mi->bank[bank].size + 12292a8cbedSRussell King mi->bank[bank].start) >> PAGE_SHIFT; 1231da177e4SLinus Torvalds 1241da177e4SLinus Torvalds if (end < start_pfn) 1251da177e4SLinus Torvalds continue; 1261da177e4SLinus Torvalds 1271da177e4SLinus Torvalds if (start < start_pfn) 1281da177e4SLinus Torvalds start = start_pfn; 1291da177e4SLinus Torvalds 1301da177e4SLinus Torvalds if (end <= start) 1311da177e4SLinus Torvalds continue; 1321da177e4SLinus Torvalds 1331da177e4SLinus Torvalds if (end - start >= bootmap_pages) { 1341da177e4SLinus Torvalds bootmap_pfn = start; 1351da177e4SLinus Torvalds break; 1361da177e4SLinus Torvalds } 1371da177e4SLinus Torvalds } 1381da177e4SLinus Torvalds 1391da177e4SLinus Torvalds if (bootmap_pfn == 0) 1401da177e4SLinus Torvalds BUG(); 1411da177e4SLinus Torvalds 1421da177e4SLinus Torvalds return bootmap_pfn; 1431da177e4SLinus Torvalds } 1441da177e4SLinus Torvalds 1451da177e4SLinus Torvalds static int __init check_initrd(struct meminfo *mi) 1461da177e4SLinus Torvalds { 1471da177e4SLinus Torvalds int initrd_node = -2; 1481da177e4SLinus Torvalds #ifdef CONFIG_BLK_DEV_INITRD 1491da177e4SLinus Torvalds unsigned long end = phys_initrd_start + phys_initrd_size; 1501da177e4SLinus Torvalds 1511da177e4SLinus Torvalds /* 1521da177e4SLinus Torvalds * Make sure that the initrd is within a valid area of 1531da177e4SLinus Torvalds * memory. 1541da177e4SLinus Torvalds */ 1551da177e4SLinus Torvalds if (phys_initrd_size) { 1561da177e4SLinus Torvalds unsigned int i; 1571da177e4SLinus Torvalds 1581da177e4SLinus Torvalds initrd_node = -1; 1591da177e4SLinus Torvalds 1601da177e4SLinus Torvalds for (i = 0; i < mi->nr_banks; i++) { 1611da177e4SLinus Torvalds unsigned long bank_end; 1621da177e4SLinus Torvalds 1631da177e4SLinus Torvalds bank_end = mi->bank[i].start + mi->bank[i].size; 1641da177e4SLinus Torvalds 1651da177e4SLinus Torvalds if (mi->bank[i].start <= phys_initrd_start && 1661da177e4SLinus Torvalds end <= bank_end) 1671da177e4SLinus Torvalds initrd_node = mi->bank[i].node; 1681da177e4SLinus Torvalds } 1691da177e4SLinus Torvalds } 1701da177e4SLinus Torvalds 1711da177e4SLinus Torvalds if (initrd_node == -1) { 1721da177e4SLinus Torvalds printk(KERN_ERR "initrd (0x%08lx - 0x%08lx) extends beyond " 1731da177e4SLinus Torvalds "physical memory - disabling initrd\n", 1741da177e4SLinus Torvalds phys_initrd_start, end); 1751da177e4SLinus Torvalds phys_initrd_start = phys_initrd_size = 0; 1761da177e4SLinus Torvalds } 1771da177e4SLinus Torvalds #endif 1781da177e4SLinus Torvalds 1791da177e4SLinus Torvalds return initrd_node; 1801da177e4SLinus Torvalds } 1811da177e4SLinus Torvalds 1821da177e4SLinus Torvalds /* 1831da177e4SLinus Torvalds * Reserve the various regions of node 0 1841da177e4SLinus Torvalds */ 18590072059SRussell King static __init void reserve_node_zero(pg_data_t *pgdat) 1861da177e4SLinus Torvalds { 1871da177e4SLinus Torvalds unsigned long res_size = 0; 1881da177e4SLinus Torvalds 1891da177e4SLinus Torvalds /* 1901da177e4SLinus Torvalds * Register the kernel text and data with bootmem. 1911da177e4SLinus Torvalds * Note that this can only be in node 0. 1921da177e4SLinus Torvalds */ 1931da177e4SLinus Torvalds #ifdef CONFIG_XIP_KERNEL 1941da177e4SLinus Torvalds reserve_bootmem_node(pgdat, __pa(&__data_start), &_end - &__data_start); 1951da177e4SLinus Torvalds #else 1961da177e4SLinus Torvalds reserve_bootmem_node(pgdat, __pa(&_stext), &_end - &_stext); 1971da177e4SLinus Torvalds #endif 1981da177e4SLinus Torvalds 1991da177e4SLinus Torvalds /* 2001da177e4SLinus Torvalds * Reserve the page tables. These are already in use, 2011da177e4SLinus Torvalds * and can only be in node 0. 2021da177e4SLinus Torvalds */ 2031da177e4SLinus Torvalds reserve_bootmem_node(pgdat, __pa(swapper_pg_dir), 2041da177e4SLinus Torvalds PTRS_PER_PGD * sizeof(pgd_t)); 2051da177e4SLinus Torvalds 2061da177e4SLinus Torvalds /* 2071da177e4SLinus Torvalds * Hmm... This should go elsewhere, but we really really need to 2081da177e4SLinus Torvalds * stop things allocating the low memory; ideally we need a better 2091da177e4SLinus Torvalds * implementation of GFP_DMA which does not assume that DMA-able 2101da177e4SLinus Torvalds * memory starts at zero. 2111da177e4SLinus Torvalds */ 2121da177e4SLinus Torvalds if (machine_is_integrator() || machine_is_cintegrator()) 2131da177e4SLinus Torvalds res_size = __pa(swapper_pg_dir) - PHYS_OFFSET; 2141da177e4SLinus Torvalds 2151da177e4SLinus Torvalds /* 2161da177e4SLinus Torvalds * These should likewise go elsewhere. They pre-reserve the 2171da177e4SLinus Torvalds * screen memory region at the start of main system memory. 2181da177e4SLinus Torvalds */ 2191da177e4SLinus Torvalds if (machine_is_edb7211()) 2201da177e4SLinus Torvalds res_size = 0x00020000; 2211da177e4SLinus Torvalds if (machine_is_p720t()) 2221da177e4SLinus Torvalds res_size = 0x00014000; 2231da177e4SLinus Torvalds 2241da177e4SLinus Torvalds #ifdef CONFIG_SA1111 2251da177e4SLinus Torvalds /* 2261da177e4SLinus Torvalds * Because of the SA1111 DMA bug, we want to preserve our 2271da177e4SLinus Torvalds * precious DMA-able memory... 2281da177e4SLinus Torvalds */ 2291da177e4SLinus Torvalds res_size = __pa(swapper_pg_dir) - PHYS_OFFSET; 2301da177e4SLinus Torvalds #endif 2311da177e4SLinus Torvalds if (res_size) 2321da177e4SLinus Torvalds reserve_bootmem_node(pgdat, PHYS_OFFSET, res_size); 2331da177e4SLinus Torvalds } 2341da177e4SLinus Torvalds 23590072059SRussell King void __init build_mem_type_table(void); 23690072059SRussell King void __init create_mapping(struct map_desc *md); 23790072059SRussell King 23890072059SRussell King static unsigned long __init 23990072059SRussell King bootmem_init_node(int node, int initrd_node, struct meminfo *mi) 2401da177e4SLinus Torvalds { 24190072059SRussell King unsigned long zone_size[MAX_NR_ZONES], zhole_size[MAX_NR_ZONES]; 24290072059SRussell King unsigned long start_pfn, end_pfn, boot_pfn; 24390072059SRussell King unsigned int boot_pages; 24490072059SRussell King pg_data_t *pgdat; 24590072059SRussell King int i; 2461da177e4SLinus Torvalds 24790072059SRussell King start_pfn = -1UL; 24890072059SRussell King end_pfn = 0; 24990072059SRussell King 25090072059SRussell King /* 25190072059SRussell King * Calculate the pfn range, and map the memory banks for this node. 25290072059SRussell King */ 25390072059SRussell King for_each_nodebank(i, mi, node) { 25490072059SRussell King unsigned long start, end; 25590072059SRussell King struct map_desc map; 25690072059SRussell King 25790072059SRussell King start = mi->bank[i].start >> PAGE_SHIFT; 25890072059SRussell King end = (mi->bank[i].start + mi->bank[i].size) >> PAGE_SHIFT; 25990072059SRussell King 26090072059SRussell King if (start_pfn > start) 26190072059SRussell King start_pfn = start; 26290072059SRussell King if (end_pfn < end) 26390072059SRussell King end_pfn = end; 26490072059SRussell King 26590072059SRussell King map.physical = mi->bank[i].start; 26690072059SRussell King map.virtual = __phys_to_virt(map.physical); 26790072059SRussell King map.length = mi->bank[i].size; 26890072059SRussell King map.type = MT_MEMORY; 26990072059SRussell King 27090072059SRussell King create_mapping(&map); 2711da177e4SLinus Torvalds } 2721da177e4SLinus Torvalds 2731da177e4SLinus Torvalds /* 27490072059SRussell King * If there is no memory in this node, ignore it. 2751da177e4SLinus Torvalds */ 27690072059SRussell King if (end_pfn == 0) 27790072059SRussell King return end_pfn; 2781da177e4SLinus Torvalds 2791da177e4SLinus Torvalds /* 28090072059SRussell King * Allocate the bootmem bitmap page. 2811da177e4SLinus Torvalds */ 28290072059SRussell King boot_pages = bootmem_bootmap_pages(end_pfn - start_pfn); 28390072059SRussell King boot_pfn = find_bootmap_pfn(node, mi, boot_pages); 2841da177e4SLinus Torvalds 2851da177e4SLinus Torvalds /* 28690072059SRussell King * Initialise the bootmem allocator for this node, handing the 28790072059SRussell King * memory banks over to bootmem. 2881da177e4SLinus Torvalds */ 28990072059SRussell King node_set_online(node); 29090072059SRussell King pgdat = NODE_DATA(node); 29190072059SRussell King init_bootmem_node(pgdat, boot_pfn, start_pfn, end_pfn); 29290072059SRussell King 29390072059SRussell King for_each_nodebank(i, mi, node) 29490072059SRussell King free_bootmem_node(pgdat, mi->bank[i].start, mi->bank[i].size); 2951da177e4SLinus Torvalds 2961da177e4SLinus Torvalds /* 29790072059SRussell King * Reserve the bootmem bitmap for this node. 2981da177e4SLinus Torvalds */ 29990072059SRussell King reserve_bootmem_node(pgdat, boot_pfn << PAGE_SHIFT, 30090072059SRussell King boot_pages << PAGE_SHIFT); 3011da177e4SLinus Torvalds 3021da177e4SLinus Torvalds #ifdef CONFIG_BLK_DEV_INITRD 30390072059SRussell King /* 30490072059SRussell King * If the initrd is in this node, reserve its memory. 30590072059SRussell King */ 30690072059SRussell King if (node == initrd_node) { 30790072059SRussell King reserve_bootmem_node(pgdat, phys_initrd_start, 3081da177e4SLinus Torvalds phys_initrd_size); 3091da177e4SLinus Torvalds initrd_start = __phys_to_virt(phys_initrd_start); 3101da177e4SLinus Torvalds initrd_end = initrd_start + phys_initrd_size; 3111da177e4SLinus Torvalds } 3121da177e4SLinus Torvalds #endif 3131da177e4SLinus Torvalds 31490072059SRussell King /* 31590072059SRussell King * Finally, reserve any node zero regions. 31690072059SRussell King */ 31790072059SRussell King if (node == 0) 31890072059SRussell King reserve_node_zero(pgdat); 31990072059SRussell King 32090072059SRussell King /* 32190072059SRussell King * initialise the zones within this node. 32290072059SRussell King */ 32390072059SRussell King memset(zone_size, 0, sizeof(zone_size)); 32490072059SRussell King memset(zhole_size, 0, sizeof(zhole_size)); 32590072059SRussell King 32690072059SRussell King /* 32790072059SRussell King * The size of this node has already been determined. If we need 32890072059SRussell King * to do anything fancy with the allocation of this memory to the 32990072059SRussell King * zones, now is the time to do it. 33090072059SRussell King */ 33190072059SRussell King zone_size[0] = end_pfn - start_pfn; 33290072059SRussell King 33390072059SRussell King /* 33490072059SRussell King * For each bank in this node, calculate the size of the holes. 33590072059SRussell King * holes = node_size - sum(bank_sizes_in_node) 33690072059SRussell King */ 33790072059SRussell King zhole_size[0] = zone_size[0]; 33890072059SRussell King for_each_nodebank(i, mi, node) 33990072059SRussell King zhole_size[0] -= mi->bank[i].size >> PAGE_SHIFT; 34090072059SRussell King 34190072059SRussell King /* 34290072059SRussell King * Adjust the sizes according to any special requirements for 34390072059SRussell King * this machine type. 34490072059SRussell King */ 34590072059SRussell King arch_adjust_zones(node, zone_size, zhole_size); 34690072059SRussell King 34790072059SRussell King free_area_init_node(node, pgdat, zone_size, start_pfn, zhole_size); 34890072059SRussell King 34990072059SRussell King return end_pfn; 35090072059SRussell King } 35190072059SRussell King 35290072059SRussell King static void __init bootmem_init(struct meminfo *mi) 35390072059SRussell King { 35490072059SRussell King unsigned long addr, memend_pfn = 0; 35590072059SRussell King int node, initrd_node, i; 35690072059SRussell King 35790072059SRussell King /* 35890072059SRussell King * Invalidate the node number for empty or invalid memory banks 35990072059SRussell King */ 36090072059SRussell King for (i = 0; i < mi->nr_banks; i++) 36190072059SRussell King if (mi->bank[i].size == 0 || mi->bank[i].node >= MAX_NUMNODES) 36290072059SRussell King mi->bank[i].node = -1; 36390072059SRussell King 36490072059SRussell King memcpy(&meminfo, mi, sizeof(meminfo)); 36590072059SRussell King 36690072059SRussell King #ifdef CONFIG_XIP_KERNEL 36790072059SRussell King #error needs fixing 36890072059SRussell King p->physical = CONFIG_XIP_PHYS_ADDR & PMD_MASK; 36990072059SRussell King p->virtual = (unsigned long)&_stext & PMD_MASK; 37090072059SRussell King p->length = ((unsigned long)&_etext - p->virtual + ~PMD_MASK) & PMD_MASK; 37190072059SRussell King p->type = MT_ROM; 37290072059SRussell King p ++; 37390072059SRussell King #endif 37490072059SRussell King 37590072059SRussell King /* 37690072059SRussell King * Clear out all the mappings below the kernel image. 37790072059SRussell King * FIXME: what about XIP? 37890072059SRussell King */ 37990072059SRussell King for (addr = 0; addr < PAGE_OFFSET; addr += PGDIR_SIZE) 38090072059SRussell King pmd_clear(pmd_off_k(addr)); 38190072059SRussell King 38290072059SRussell King /* 38390072059SRussell King * Clear out all the kernel space mappings, except for the first 38490072059SRussell King * memory bank, up to the end of the vmalloc region. 38590072059SRussell King */ 38690072059SRussell King for (addr = __phys_to_virt(mi->bank[0].start + mi->bank[0].size); 38790072059SRussell King addr < VMALLOC_END; addr += PGDIR_SIZE) 38890072059SRussell King pmd_clear(pmd_off_k(addr)); 38990072059SRussell King 39090072059SRussell King /* 39190072059SRussell King * Locate which node contains the ramdisk image, if any. 39290072059SRussell King */ 39390072059SRussell King initrd_node = check_initrd(mi); 39490072059SRussell King 39590072059SRussell King /* 39690072059SRussell King * Run through each node initialising the bootmem allocator. 39790072059SRussell King */ 39890072059SRussell King for_each_node(node) { 39990072059SRussell King unsigned long end_pfn; 40090072059SRussell King 40190072059SRussell King end_pfn = bootmem_init_node(node, initrd_node, mi); 40290072059SRussell King 40390072059SRussell King /* 40490072059SRussell King * Remember the highest memory PFN. 40590072059SRussell King */ 40690072059SRussell King if (end_pfn > memend_pfn) 40790072059SRussell King memend_pfn = end_pfn; 40890072059SRussell King } 40990072059SRussell King 41090072059SRussell King high_memory = __va(memend_pfn << PAGE_SHIFT); 41190072059SRussell King 41290072059SRussell King /* 41390072059SRussell King * This doesn't seem to be used by the Linux memory manager any 41490072059SRussell King * more, but is used by ll_rw_block. If we can get rid of it, we 41590072059SRussell King * also get rid of some of the stuff above as well. 41690072059SRussell King * 41790072059SRussell King * Note: max_low_pfn and max_pfn reflect the number of _pages_ in 41890072059SRussell King * the system, not the maximum PFN. 41990072059SRussell King */ 42090072059SRussell King max_pfn = max_low_pfn = memend_pfn - PHYS_PFN_OFFSET; 42190072059SRussell King } 42290072059SRussell King 42390072059SRussell King /* 42490072059SRussell King * Set up device the mappings. Since we clear out the page tables for all 42590072059SRussell King * mappings above VMALLOC_END, we will remove any debug device mappings. 42690072059SRussell King * This means you have to be careful how you debug this function, or any 42790072059SRussell King * called function. (Do it by code inspection!) 42890072059SRussell King */ 42990072059SRussell King static void __init devicemaps_init(struct machine_desc *mdesc) 43090072059SRussell King { 43190072059SRussell King struct map_desc map; 43290072059SRussell King unsigned long addr; 43390072059SRussell King void *vectors; 43490072059SRussell King 43590072059SRussell King for (addr = VMALLOC_END; addr; addr += PGDIR_SIZE) 43690072059SRussell King pmd_clear(pmd_off_k(addr)); 43790072059SRussell King 43890072059SRussell King /* 43990072059SRussell King * Map the cache flushing regions. 44090072059SRussell King */ 44190072059SRussell King #ifdef FLUSH_BASE 44290072059SRussell King map.physical = FLUSH_BASE_PHYS; 44390072059SRussell King map.virtual = FLUSH_BASE; 44490072059SRussell King map.length = PGDIR_SIZE; 44590072059SRussell King map.type = MT_CACHECLEAN; 44690072059SRussell King create_mapping(&map); 44790072059SRussell King #endif 44890072059SRussell King #ifdef FLUSH_BASE_MINICACHE 44990072059SRussell King map.physical = FLUSH_BASE_PHYS + PGDIR_SIZE; 45090072059SRussell King map.virtual = FLUSH_BASE_MINICACHE; 45190072059SRussell King map.length = PGDIR_SIZE; 45290072059SRussell King map.type = MT_MINICLEAN; 45390072059SRussell King create_mapping(&map); 45490072059SRussell King #endif 45590072059SRussell King 45690072059SRussell King flush_cache_all(); 45790072059SRussell King local_flush_tlb_all(); 45890072059SRussell King 45990072059SRussell King vectors = alloc_bootmem_low_pages(PAGE_SIZE); 46090072059SRussell King BUG_ON(!vectors); 46190072059SRussell King 46290072059SRussell King /* 46390072059SRussell King * Create a mapping for the machine vectors at the high-vectors 46490072059SRussell King * location (0xffff0000). If we aren't using high-vectors, also 46590072059SRussell King * create a mapping at the low-vectors virtual address. 46690072059SRussell King */ 46790072059SRussell King map.physical = virt_to_phys(vectors); 46890072059SRussell King map.virtual = 0xffff0000; 46990072059SRussell King map.length = PAGE_SIZE; 47090072059SRussell King map.type = MT_HIGH_VECTORS; 47190072059SRussell King create_mapping(&map); 47290072059SRussell King 47390072059SRussell King if (!vectors_high()) { 47490072059SRussell King map.virtual = 0; 47590072059SRussell King map.type = MT_LOW_VECTORS; 47690072059SRussell King create_mapping(&map); 47790072059SRussell King } 47890072059SRussell King 47990072059SRussell King /* 48090072059SRussell King * Ask the machine support to map in the statically mapped devices. 48190072059SRussell King * After this point, we can start to touch devices again. 48290072059SRussell King */ 48390072059SRussell King if (mdesc->map_io) 48490072059SRussell King mdesc->map_io(); 4851da177e4SLinus Torvalds } 4861da177e4SLinus Torvalds 4871da177e4SLinus Torvalds /* 4881da177e4SLinus Torvalds * paging_init() sets up the page tables, initialises the zone memory 4891da177e4SLinus Torvalds * maps, and sets up the zero page, bad page and bad page tables. 4901da177e4SLinus Torvalds */ 4911da177e4SLinus Torvalds void __init paging_init(struct meminfo *mi, struct machine_desc *mdesc) 4921da177e4SLinus Torvalds { 4931da177e4SLinus Torvalds void *zero_page; 4941da177e4SLinus Torvalds 49590072059SRussell King build_mem_type_table(); 4961da177e4SLinus Torvalds bootmem_init(mi); 49790072059SRussell King devicemaps_init(mdesc); 4981da177e4SLinus Torvalds 49990072059SRussell King top_pmd = pmd_off_k(0xffff0000); 5001da177e4SLinus Torvalds 5011da177e4SLinus Torvalds /* 5021da177e4SLinus Torvalds * allocate the zero page. Note that we count on this going ok. 5031da177e4SLinus Torvalds */ 5041da177e4SLinus Torvalds zero_page = alloc_bootmem_low_pages(PAGE_SIZE); 5051da177e4SLinus Torvalds memzero(zero_page, PAGE_SIZE); 5061da177e4SLinus Torvalds empty_zero_page = virt_to_page(zero_page); 5071da177e4SLinus Torvalds flush_dcache_page(empty_zero_page); 5081da177e4SLinus Torvalds } 5091da177e4SLinus Torvalds 5101da177e4SLinus Torvalds static inline void free_area(unsigned long addr, unsigned long end, char *s) 5111da177e4SLinus Torvalds { 5121da177e4SLinus Torvalds unsigned int size = (end - addr) >> 10; 5131da177e4SLinus Torvalds 5141da177e4SLinus Torvalds for (; addr < end; addr += PAGE_SIZE) { 5151da177e4SLinus Torvalds struct page *page = virt_to_page(addr); 5161da177e4SLinus Torvalds ClearPageReserved(page); 5171da177e4SLinus Torvalds set_page_count(page, 1); 5181da177e4SLinus Torvalds free_page(addr); 5191da177e4SLinus Torvalds totalram_pages++; 5201da177e4SLinus Torvalds } 5211da177e4SLinus Torvalds 5221da177e4SLinus Torvalds if (size && s) 5231da177e4SLinus Torvalds printk(KERN_INFO "Freeing %s memory: %dK\n", s, size); 5241da177e4SLinus Torvalds } 5251da177e4SLinus Torvalds 526a013053dSRussell King static inline void 527a013053dSRussell King free_memmap(int node, unsigned long start_pfn, unsigned long end_pfn) 528a013053dSRussell King { 529a013053dSRussell King struct page *start_pg, *end_pg; 530a013053dSRussell King unsigned long pg, pgend; 531a013053dSRussell King 532a013053dSRussell King /* 533a013053dSRussell King * Convert start_pfn/end_pfn to a struct page pointer. 534a013053dSRussell King */ 535a013053dSRussell King start_pg = pfn_to_page(start_pfn); 536a013053dSRussell King end_pg = pfn_to_page(end_pfn); 537a013053dSRussell King 538a013053dSRussell King /* 539a013053dSRussell King * Convert to physical addresses, and 540a013053dSRussell King * round start upwards and end downwards. 541a013053dSRussell King */ 542a013053dSRussell King pg = PAGE_ALIGN(__pa(start_pg)); 543a013053dSRussell King pgend = __pa(end_pg) & PAGE_MASK; 544a013053dSRussell King 545a013053dSRussell King /* 546a013053dSRussell King * If there are free pages between these, 547a013053dSRussell King * free the section of the memmap array. 548a013053dSRussell King */ 549a013053dSRussell King if (pg < pgend) 550a013053dSRussell King free_bootmem_node(NODE_DATA(node), pg, pgend - pg); 551a013053dSRussell King } 552a013053dSRussell King 553a013053dSRussell King /* 554a013053dSRussell King * The mem_map array can get very big. Free the unused area of the memory map. 555a013053dSRussell King */ 556a013053dSRussell King static void __init free_unused_memmap_node(int node, struct meminfo *mi) 557a013053dSRussell King { 558a013053dSRussell King unsigned long bank_start, prev_bank_end = 0; 559a013053dSRussell King unsigned int i; 560a013053dSRussell King 561a013053dSRussell King /* 562a013053dSRussell King * [FIXME] This relies on each bank being in address order. This 563a013053dSRussell King * may not be the case, especially if the user has provided the 564a013053dSRussell King * information on the command line. 565a013053dSRussell King */ 56690072059SRussell King for_each_nodebank(i, mi, node) { 567a013053dSRussell King bank_start = mi->bank[i].start >> PAGE_SHIFT; 568a013053dSRussell King if (bank_start < prev_bank_end) { 569a013053dSRussell King printk(KERN_ERR "MEM: unordered memory banks. " 570a013053dSRussell King "Not freeing memmap.\n"); 571a013053dSRussell King break; 572a013053dSRussell King } 573a013053dSRussell King 574a013053dSRussell King /* 575a013053dSRussell King * If we had a previous bank, and there is a space 576a013053dSRussell King * between the current bank and the previous, free it. 577a013053dSRussell King */ 578a013053dSRussell King if (prev_bank_end && prev_bank_end != bank_start) 579a013053dSRussell King free_memmap(node, prev_bank_end, bank_start); 580a013053dSRussell King 581a013053dSRussell King prev_bank_end = (mi->bank[i].start + 582a013053dSRussell King mi->bank[i].size) >> PAGE_SHIFT; 583a013053dSRussell King } 584a013053dSRussell King } 585a013053dSRussell King 5861da177e4SLinus Torvalds /* 5871da177e4SLinus Torvalds * mem_init() marks the free areas in the mem_map and tells us how much 5881da177e4SLinus Torvalds * memory is free. This is done after various parts of the system have 5891da177e4SLinus Torvalds * claimed their memory after the kernel image. 5901da177e4SLinus Torvalds */ 5911da177e4SLinus Torvalds void __init mem_init(void) 5921da177e4SLinus Torvalds { 5931da177e4SLinus Torvalds unsigned int codepages, datapages, initpages; 5941da177e4SLinus Torvalds int i, node; 5951da177e4SLinus Torvalds 5961da177e4SLinus Torvalds codepages = &_etext - &_text; 5971da177e4SLinus Torvalds datapages = &_end - &__data_start; 5981da177e4SLinus Torvalds initpages = &__init_end - &__init_begin; 5991da177e4SLinus Torvalds 6001da177e4SLinus Torvalds #ifndef CONFIG_DISCONTIGMEM 6011da177e4SLinus Torvalds max_mapnr = virt_to_page(high_memory) - mem_map; 6021da177e4SLinus Torvalds #endif 6031da177e4SLinus Torvalds 6041da177e4SLinus Torvalds /* this will put all unused low memory onto the freelists */ 6051da177e4SLinus Torvalds for_each_online_node(node) { 6061da177e4SLinus Torvalds pg_data_t *pgdat = NODE_DATA(node); 6071da177e4SLinus Torvalds 608a013053dSRussell King free_unused_memmap_node(node, &meminfo); 609a013053dSRussell King 6101da177e4SLinus Torvalds if (pgdat->node_spanned_pages != 0) 6111da177e4SLinus Torvalds totalram_pages += free_all_bootmem_node(pgdat); 6121da177e4SLinus Torvalds } 6131da177e4SLinus Torvalds 6141da177e4SLinus Torvalds #ifdef CONFIG_SA1111 6151da177e4SLinus Torvalds /* now that our DMA memory is actually so designated, we can free it */ 6161da177e4SLinus Torvalds free_area(PAGE_OFFSET, (unsigned long)swapper_pg_dir, NULL); 6171da177e4SLinus Torvalds #endif 6181da177e4SLinus Torvalds 6191da177e4SLinus Torvalds /* 6201da177e4SLinus Torvalds * Since our memory may not be contiguous, calculate the 6211da177e4SLinus Torvalds * real number of pages we have in this system 6221da177e4SLinus Torvalds */ 6231da177e4SLinus Torvalds printk(KERN_INFO "Memory:"); 6241da177e4SLinus Torvalds 6251da177e4SLinus Torvalds num_physpages = 0; 6261da177e4SLinus Torvalds for (i = 0; i < meminfo.nr_banks; i++) { 6271da177e4SLinus Torvalds num_physpages += meminfo.bank[i].size >> PAGE_SHIFT; 6281da177e4SLinus Torvalds printk(" %ldMB", meminfo.bank[i].size >> 20); 6291da177e4SLinus Torvalds } 6301da177e4SLinus Torvalds 6311da177e4SLinus Torvalds printk(" = %luMB total\n", num_physpages >> (20 - PAGE_SHIFT)); 6321da177e4SLinus Torvalds printk(KERN_NOTICE "Memory: %luKB available (%dK code, " 6331da177e4SLinus Torvalds "%dK data, %dK init)\n", 6341da177e4SLinus Torvalds (unsigned long) nr_free_pages() << (PAGE_SHIFT-10), 6351da177e4SLinus Torvalds codepages >> 10, datapages >> 10, initpages >> 10); 6361da177e4SLinus Torvalds 6371da177e4SLinus Torvalds if (PAGE_SIZE >= 16384 && num_physpages <= 128) { 6381da177e4SLinus Torvalds extern int sysctl_overcommit_memory; 6391da177e4SLinus Torvalds /* 6401da177e4SLinus Torvalds * On a machine this small we won't get 6411da177e4SLinus Torvalds * anywhere without overcommit, so turn 6421da177e4SLinus Torvalds * it on by default. 6431da177e4SLinus Torvalds */ 6441da177e4SLinus Torvalds sysctl_overcommit_memory = OVERCOMMIT_ALWAYS; 6451da177e4SLinus Torvalds } 6461da177e4SLinus Torvalds } 6471da177e4SLinus Torvalds 6481da177e4SLinus Torvalds void free_initmem(void) 6491da177e4SLinus Torvalds { 6501da177e4SLinus Torvalds if (!machine_is_integrator() && !machine_is_cintegrator()) { 6511da177e4SLinus Torvalds free_area((unsigned long)(&__init_begin), 6521da177e4SLinus Torvalds (unsigned long)(&__init_end), 6531da177e4SLinus Torvalds "init"); 6541da177e4SLinus Torvalds } 6551da177e4SLinus Torvalds } 6561da177e4SLinus Torvalds 6571da177e4SLinus Torvalds #ifdef CONFIG_BLK_DEV_INITRD 6581da177e4SLinus Torvalds 6591da177e4SLinus Torvalds static int keep_initrd; 6601da177e4SLinus Torvalds 6611da177e4SLinus Torvalds void free_initrd_mem(unsigned long start, unsigned long end) 6621da177e4SLinus Torvalds { 6631da177e4SLinus Torvalds if (!keep_initrd) 6641da177e4SLinus Torvalds free_area(start, end, "initrd"); 6651da177e4SLinus Torvalds } 6661da177e4SLinus Torvalds 6671da177e4SLinus Torvalds static int __init keepinitrd_setup(char *__unused) 6681da177e4SLinus Torvalds { 6691da177e4SLinus Torvalds keep_initrd = 1; 6701da177e4SLinus Torvalds return 1; 6711da177e4SLinus Torvalds } 6721da177e4SLinus Torvalds 6731da177e4SLinus Torvalds __setup("keepinitrd", keepinitrd_setup); 6741da177e4SLinus Torvalds #endif 675