| /* |
| * linux/arch/arm/mm/init.c |
| * |
| * Copyright (C) 1995-2005 Russell King |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License version 2 as |
| * published by the Free Software Foundation. |
| */ |
| #include <linux/kernel.h> |
| #include <linux/errno.h> |
| #include <linux/swap.h> |
| #include <linux/init.h> |
| #include <linux/bootmem.h> |
| #include <linux/mman.h> |
| #include <linux/nodemask.h> |
| #include <linux/initrd.h> |
| |
| #include <asm/mach-types.h> |
| #include <asm/setup.h> |
| #include <asm/sizes.h> |
| #include <asm/tlb.h> |
| |
| #include <asm/mach/arch.h> |
| #include <asm/mach/map.h> |
| |
| #include "mm.h" |
| |
| static unsigned long phys_initrd_start __initdata = 0; |
| static unsigned long phys_initrd_size __initdata = 0; |
| |
| static void __init early_initrd(char **p) |
| { |
| unsigned long start, size; |
| |
| start = memparse(*p, p); |
| if (**p == ',') { |
| size = memparse((*p) + 1, p); |
| |
| phys_initrd_start = start; |
| phys_initrd_size = size; |
| } |
| } |
| __early_param("initrd=", early_initrd); |
| |
| static int __init parse_tag_initrd(const struct tag *tag) |
| { |
| printk(KERN_WARNING "ATAG_INITRD is deprecated; " |
| "please update your bootloader.\n"); |
| phys_initrd_start = __virt_to_phys(tag->u.initrd.start); |
| phys_initrd_size = tag->u.initrd.size; |
| return 0; |
| } |
| |
| __tagtable(ATAG_INITRD, parse_tag_initrd); |
| |
| static int __init parse_tag_initrd2(const struct tag *tag) |
| { |
| phys_initrd_start = tag->u.initrd.start; |
| phys_initrd_size = tag->u.initrd.size; |
| return 0; |
| } |
| |
| __tagtable(ATAG_INITRD2, parse_tag_initrd2); |
| |
| /* |
| * This is used to pass memory configuration data from paging_init |
| * to mem_init, and by show_mem() to skip holes in the memory map. |
| */ |
| static struct meminfo meminfo = { 0, }; |
| |
| #define for_each_nodebank(iter,mi,no) \ |
| for (iter = 0; iter < mi->nr_banks; iter++) \ |
| if (mi->bank[iter].node == no) |
| |
| void show_mem(void) |
| { |
| int free = 0, total = 0, reserved = 0; |
| int shared = 0, cached = 0, slab = 0, node, i; |
| struct meminfo * mi = &meminfo; |
| |
| printk("Mem-info:\n"); |
| show_free_areas(); |
| for_each_online_node(node) { |
| pg_data_t *n = NODE_DATA(node); |
| struct page *map = n->node_mem_map - n->node_start_pfn; |
| |
| for_each_nodebank (i,mi,node) { |
| unsigned int pfn1, pfn2; |
| struct page *page, *end; |
| |
| pfn1 = __phys_to_pfn(mi->bank[i].start); |
| pfn2 = __phys_to_pfn(mi->bank[i].size + mi->bank[i].start); |
| |
| page = map + pfn1; |
| end = map + pfn2; |
| |
| do { |
| total++; |
| if (PageReserved(page)) |
| reserved++; |
| else if (PageSwapCache(page)) |
| cached++; |
| else if (PageSlab(page)) |
| slab++; |
| else if (!page_count(page)) |
| free++; |
| else |
| shared += page_count(page) - 1; |
| page++; |
| } while (page < end); |
| } |
| } |
| |
| printk("%d pages of RAM\n", total); |
| printk("%d free pages\n", free); |
| printk("%d reserved pages\n", reserved); |
| printk("%d slab pages\n", slab); |
| printk("%d pages shared\n", shared); |
| printk("%d pages swap cached\n", cached); |
| } |
| |
| /* |
| * FIXME: We really want to avoid allocating the bootmap bitmap |
| * over the top of the initrd. Hopefully, this is located towards |
| * the start of a bank, so if we allocate the bootmap bitmap at |
| * the end, we won't clash. |
| */ |
| static unsigned int __init |
| find_bootmap_pfn(int node, struct meminfo *mi, unsigned int bootmap_pages) |
| { |
| unsigned int start_pfn, bank, bootmap_pfn; |
| |
| start_pfn = PAGE_ALIGN(__pa(&_end)) >> PAGE_SHIFT; |
| bootmap_pfn = 0; |
| |
| for_each_nodebank(bank, mi, node) { |
| unsigned int start, end; |
| |
| start = mi->bank[bank].start >> PAGE_SHIFT; |
| end = (mi->bank[bank].size + |
| mi->bank[bank].start) >> PAGE_SHIFT; |
| |
| if (end < start_pfn) |
| continue; |
| |
| if (start < start_pfn) |
| start = start_pfn; |
| |
| if (end <= start) |
| continue; |
| |
| if (end - start >= bootmap_pages) { |
| bootmap_pfn = start; |
| break; |
| } |
| } |
| |
| if (bootmap_pfn == 0) |
| BUG(); |
| |
| return bootmap_pfn; |
| } |
| |
| static int __init check_initrd(struct meminfo *mi) |
| { |
| int initrd_node = -2; |
| #ifdef CONFIG_BLK_DEV_INITRD |
| unsigned long end = phys_initrd_start + phys_initrd_size; |
| |
| /* |
| * Make sure that the initrd is within a valid area of |
| * memory. |
| */ |
| if (phys_initrd_size) { |
| unsigned int i; |
| |
| initrd_node = -1; |
| |
| for (i = 0; i < mi->nr_banks; i++) { |
| unsigned long bank_end; |
| |
| bank_end = mi->bank[i].start + mi->bank[i].size; |
| |
| if (mi->bank[i].start <= phys_initrd_start && |
| end <= bank_end) |
| initrd_node = mi->bank[i].node; |
| } |
| } |
| |
| if (initrd_node == -1) { |
| printk(KERN_ERR "INITRD: 0x%08lx+0x%08lx extends beyond " |
| "physical memory - disabling initrd\n", |
| phys_initrd_start, phys_initrd_size); |
| phys_initrd_start = phys_initrd_size = 0; |
| } |
| #endif |
| |
| return initrd_node; |
| } |
| |
| static inline void map_memory_bank(struct membank *bank) |
| { |
| #ifdef CONFIG_MMU |
| struct map_desc map; |
| |
| map.pfn = __phys_to_pfn(bank->start); |
| map.virtual = __phys_to_virt(bank->start); |
| map.length = bank->size; |
| map.type = MT_MEMORY; |
| |
| create_mapping(&map); |
| #endif |
| } |
| |
| static unsigned long __init |
| bootmem_init_node(int node, int initrd_node, struct meminfo *mi) |
| { |
| unsigned long zone_size[MAX_NR_ZONES], zhole_size[MAX_NR_ZONES]; |
| unsigned long start_pfn, end_pfn, boot_pfn; |
| unsigned int boot_pages; |
| pg_data_t *pgdat; |
| int i; |
| |
| start_pfn = -1UL; |
| end_pfn = 0; |
| |
| /* |
| * Calculate the pfn range, and map the memory banks for this node. |
| */ |
| for_each_nodebank(i, mi, node) { |
| struct membank *bank = &mi->bank[i]; |
| unsigned long start, end; |
| |
| start = bank->start >> PAGE_SHIFT; |
| end = (bank->start + bank->size) >> PAGE_SHIFT; |
| |
| if (start_pfn > start) |
| start_pfn = start; |
| if (end_pfn < end) |
| end_pfn = end; |
| |
| map_memory_bank(bank); |
| } |
| |
| /* |
| * If there is no memory in this node, ignore it. |
| */ |
| if (end_pfn == 0) |
| return end_pfn; |
| |
| /* |
| * Allocate the bootmem bitmap page. |
| */ |
| boot_pages = bootmem_bootmap_pages(end_pfn - start_pfn); |
| boot_pfn = find_bootmap_pfn(node, mi, boot_pages); |
| |
| /* |
| * Initialise the bootmem allocator for this node, handing the |
| * memory banks over to bootmem. |
| */ |
| node_set_online(node); |
| pgdat = NODE_DATA(node); |
| init_bootmem_node(pgdat, boot_pfn, start_pfn, end_pfn); |
| |
| for_each_nodebank(i, mi, node) |
| free_bootmem_node(pgdat, mi->bank[i].start, mi->bank[i].size); |
| |
| /* |
| * Reserve the bootmem bitmap for this node. |
| */ |
| reserve_bootmem_node(pgdat, boot_pfn << PAGE_SHIFT, |
| boot_pages << PAGE_SHIFT, BOOTMEM_DEFAULT); |
| |
| /* |
| * Reserve any special node zero regions. |
| */ |
| if (node == 0) |
| reserve_node_zero(pgdat); |
| |
| #ifdef CONFIG_BLK_DEV_INITRD |
| /* |
| * If the initrd is in this node, reserve its memory. |
| */ |
| if (node == initrd_node) { |
| int res = reserve_bootmem_node(pgdat, phys_initrd_start, |
| phys_initrd_size, BOOTMEM_EXCLUSIVE); |
| |
| if (res == 0) { |
| initrd_start = __phys_to_virt(phys_initrd_start); |
| initrd_end = initrd_start + phys_initrd_size; |
| } else { |
| printk(KERN_ERR |
| "INITRD: 0x%08lx+0x%08lx overlaps in-use " |
| "memory region - disabling initrd\n", |
| phys_initrd_start, phys_initrd_size); |
| } |
| } |
| #endif |
| |
| /* |
| * initialise the zones within this node. |
| */ |
| memset(zone_size, 0, sizeof(zone_size)); |
| memset(zhole_size, 0, sizeof(zhole_size)); |
| |
| /* |
| * The size of this node has already been determined. If we need |
| * to do anything fancy with the allocation of this memory to the |
| * zones, now is the time to do it. |
| */ |
| zone_size[0] = end_pfn - start_pfn; |
| |
| /* |
| * For each bank in this node, calculate the size of the holes. |
| * holes = node_size - sum(bank_sizes_in_node) |
| */ |
| zhole_size[0] = zone_size[0]; |
| for_each_nodebank(i, mi, node) |
| zhole_size[0] -= mi->bank[i].size >> PAGE_SHIFT; |
| |
| /* |
| * Adjust the sizes according to any special requirements for |
| * this machine type. |
| */ |
| arch_adjust_zones(node, zone_size, zhole_size); |
| |
| free_area_init_node(node, zone_size, start_pfn, zhole_size); |
| |
| return end_pfn; |
| } |
| |
| void __init bootmem_init(struct meminfo *mi) |
| { |
| unsigned long memend_pfn = 0; |
| int node, initrd_node, i; |
| |
| /* |
| * Invalidate the node number for empty or invalid memory banks |
| */ |
| for (i = 0; i < mi->nr_banks; i++) |
| if (mi->bank[i].size == 0 || mi->bank[i].node >= MAX_NUMNODES) |
| mi->bank[i].node = -1; |
| |
| memcpy(&meminfo, mi, sizeof(meminfo)); |
| |
| /* |
| * Locate which node contains the ramdisk image, if any. |
| */ |
| initrd_node = check_initrd(mi); |
| |
| /* |
| * Run through each node initialising the bootmem allocator. |
| */ |
| for_each_node(node) { |
| unsigned long end_pfn; |
| |
| end_pfn = bootmem_init_node(node, initrd_node, mi); |
| |
| /* |
| * Remember the highest memory PFN. |
| */ |
| if (end_pfn > memend_pfn) |
| memend_pfn = end_pfn; |
| } |
| |
| high_memory = __va(memend_pfn << PAGE_SHIFT); |
| |
| /* |
| * This doesn't seem to be used by the Linux memory manager any |
| * more, but is used by ll_rw_block. If we can get rid of it, we |
| * also get rid of some of the stuff above as well. |
| * |
| * Note: max_low_pfn and max_pfn reflect the number of _pages_ in |
| * the system, not the maximum PFN. |
| */ |
| max_pfn = max_low_pfn = memend_pfn - PHYS_PFN_OFFSET; |
| } |
| |
| static inline void free_area(unsigned long addr, unsigned long end, char *s) |
| { |
| unsigned int size = (end - addr) >> 10; |
| |
| for (; addr < end; addr += PAGE_SIZE) { |
| struct page *page = virt_to_page(addr); |
| ClearPageReserved(page); |
| init_page_count(page); |
| free_page(addr); |
| totalram_pages++; |
| } |
| |
| if (size && s) |
| printk(KERN_INFO "Freeing %s memory: %dK\n", s, size); |
| } |
| |
| static inline void |
| free_memmap(int node, unsigned long start_pfn, unsigned long end_pfn) |
| { |
| struct page *start_pg, *end_pg; |
| unsigned long pg, pgend; |
| |
| /* |
| * Convert start_pfn/end_pfn to a struct page pointer. |
| */ |
| start_pg = pfn_to_page(start_pfn); |
| end_pg = pfn_to_page(end_pfn); |
| |
| /* |
| * Convert to physical addresses, and |
| * round start upwards and end downwards. |
| */ |
| pg = PAGE_ALIGN(__pa(start_pg)); |
| pgend = __pa(end_pg) & PAGE_MASK; |
| |
| /* |
| * If there are free pages between these, |
| * free the section of the memmap array. |
| */ |
| if (pg < pgend) |
| free_bootmem_node(NODE_DATA(node), pg, pgend - pg); |
| } |
| |
| /* |
| * The mem_map array can get very big. Free the unused area of the memory map. |
| */ |
| static void __init free_unused_memmap_node(int node, struct meminfo *mi) |
| { |
| unsigned long bank_start, prev_bank_end = 0; |
| unsigned int i; |
| |
| /* |
| * [FIXME] This relies on each bank being in address order. This |
| * may not be the case, especially if the user has provided the |
| * information on the command line. |
| */ |
| for_each_nodebank(i, mi, node) { |
| bank_start = mi->bank[i].start >> PAGE_SHIFT; |
| if (bank_start < prev_bank_end) { |
| printk(KERN_ERR "MEM: unordered memory banks. " |
| "Not freeing memmap.\n"); |
| break; |
| } |
| |
| /* |
| * If we had a previous bank, and there is a space |
| * between the current bank and the previous, free it. |
| */ |
| if (prev_bank_end && prev_bank_end != bank_start) |
| free_memmap(node, prev_bank_end, bank_start); |
| |
| prev_bank_end = (mi->bank[i].start + |
| mi->bank[i].size) >> PAGE_SHIFT; |
| } |
| } |
| |
| /* |
| * mem_init() marks the free areas in the mem_map and tells us how much |
| * memory is free. This is done after various parts of the system have |
| * claimed their memory after the kernel image. |
| */ |
| void __init mem_init(void) |
| { |
| unsigned int codepages, datapages, initpages; |
| int i, node; |
| |
| codepages = &_etext - &_text; |
| datapages = &_end - &__data_start; |
| initpages = &__init_end - &__init_begin; |
| |
| #ifndef CONFIG_DISCONTIGMEM |
| max_mapnr = virt_to_page(high_memory) - mem_map; |
| #endif |
| |
| /* this will put all unused low memory onto the freelists */ |
| for_each_online_node(node) { |
| pg_data_t *pgdat = NODE_DATA(node); |
| |
| free_unused_memmap_node(node, &meminfo); |
| |
| if (pgdat->node_spanned_pages != 0) |
| totalram_pages += free_all_bootmem_node(pgdat); |
| } |
| |
| #ifdef CONFIG_SA1111 |
| /* now that our DMA memory is actually so designated, we can free it */ |
| free_area(PAGE_OFFSET, (unsigned long)swapper_pg_dir, NULL); |
| #endif |
| |
| /* |
| * Since our memory may not be contiguous, calculate the |
| * real number of pages we have in this system |
| */ |
| printk(KERN_INFO "Memory:"); |
| |
| num_physpages = 0; |
| for (i = 0; i < meminfo.nr_banks; i++) { |
| num_physpages += meminfo.bank[i].size >> PAGE_SHIFT; |
| printk(" %ldMB", meminfo.bank[i].size >> 20); |
| } |
| |
| printk(" = %luMB total\n", num_physpages >> (20 - PAGE_SHIFT)); |
| printk(KERN_NOTICE "Memory: %luKB available (%dK code, " |
| "%dK data, %dK init)\n", |
| (unsigned long) nr_free_pages() << (PAGE_SHIFT-10), |
| codepages >> 10, datapages >> 10, initpages >> 10); |
| |
| if (PAGE_SIZE >= 16384 && num_physpages <= 128) { |
| extern int sysctl_overcommit_memory; |
| /* |
| * On a machine this small we won't get |
| * anywhere without overcommit, so turn |
| * it on by default. |
| */ |
| sysctl_overcommit_memory = OVERCOMMIT_ALWAYS; |
| } |
| } |
| |
| void free_initmem(void) |
| { |
| if (!machine_is_integrator() && !machine_is_cintegrator()) { |
| free_area((unsigned long)(&__init_begin), |
| (unsigned long)(&__init_end), |
| "init"); |
| } |
| } |
| |
| #ifdef CONFIG_BLK_DEV_INITRD |
| |
| static int keep_initrd; |
| |
| void free_initrd_mem(unsigned long start, unsigned long end) |
| { |
| if (!keep_initrd) |
| free_area(start, end, "initrd"); |
| } |
| |
| static int __init keepinitrd_setup(char *__unused) |
| { |
| keep_initrd = 1; |
| return 1; |
| } |
| |
| __setup("keepinitrd", keepinitrd_setup); |
| #endif |