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