567 lines
13 KiB
C
567 lines
13 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/sections.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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static unsigned long phys_initrd_start __initdata = 0;
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static unsigned long phys_initrd_size __initdata = 0;
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static void __init early_initrd(char **p)
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{
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unsigned long start, size;
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start = memparse(*p, p);
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if (**p == ',') {
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size = memparse((*p) + 1, p);
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phys_initrd_start = start;
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phys_initrd_size = size;
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}
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}
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__early_param("initrd=", early_initrd);
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static int __init parse_tag_initrd(const struct tag *tag)
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{
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printk(KERN_WARNING "ATAG_INITRD is deprecated; "
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"please update your bootloader.\n");
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phys_initrd_start = __virt_to_phys(tag->u.initrd.start);
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phys_initrd_size = tag->u.initrd.size;
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return 0;
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}
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__tagtable(ATAG_INITRD, parse_tag_initrd);
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static int __init parse_tag_initrd2(const struct tag *tag)
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{
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phys_initrd_start = tag->u.initrd.start;
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phys_initrd_size = tag->u.initrd.size;
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return 0;
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}
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__tagtable(ATAG_INITRD2, parse_tag_initrd2);
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/*
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* This keeps memory configuration data used by a couple memory
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* initialization functions, as well as show_mem() for the skipping
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* of holes in the memory map. It is populated by arm_add_memory().
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*/
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struct meminfo meminfo;
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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 = pgdat_page_nr(n, 0) - n->node_start_pfn;
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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 int pfn1, pfn2;
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struct page *page, *end;
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pfn1 = bank_pfn_start(bank);
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pfn2 = bank_pfn_end(bank);
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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, i, 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(i, mi, node) {
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struct membank *bank = &mi->bank[i];
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unsigned int start, end;
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start = bank_pfn_start(bank);
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end = bank_pfn_end(bank);
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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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struct membank *bank = &mi->bank[i];
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if (bank_phys_start(bank) <= phys_initrd_start &&
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end <= bank_phys_end(bank))
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initrd_node = bank->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, phys_initrd_size);
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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 = bank_pfn_start(bank);
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map.virtual = __phys_to_virt(bank_phys_start(bank));
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map.length = bank_phys_size(bank);
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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 bootmem_init_node(int node, struct meminfo *mi)
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{
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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_pfn_start(bank);
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end = bank_pfn_end(bank);
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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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struct membank *bank = &mi->bank[i];
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free_bootmem_node(pgdat, bank_phys_start(bank), bank_phys_size(bank));
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memory_present(node, bank_pfn_start(bank), bank_pfn_end(bank));
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}
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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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return end_pfn;
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}
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static void __init bootmem_reserve_initrd(int node)
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{
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#ifdef CONFIG_BLK_DEV_INITRD
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pg_data_t *pgdat = NODE_DATA(node);
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int res;
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res = reserve_bootmem_node(pgdat, phys_initrd_start,
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phys_initrd_size, BOOTMEM_EXCLUSIVE);
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if (res == 0) {
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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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} else {
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printk(KERN_ERR
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"INITRD: 0x%08lx+0x%08lx overlaps in-use "
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"memory region - disabling initrd\n",
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phys_initrd_start, phys_initrd_size);
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}
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#endif
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}
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static void __init bootmem_free_node(int 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;
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pg_data_t *pgdat = NODE_DATA(node);
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int i;
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start_pfn = pgdat->bdata->node_min_pfn;
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end_pfn = pgdat->bdata->node_low_pfn;
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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] -= bank_pfn_size(&mi->bank[i]);
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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, zone_size, start_pfn, zhole_size);
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}
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void __init bootmem_init(void)
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{
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struct meminfo *mi = &meminfo;
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unsigned long memend_pfn = 0;
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int node, initrd_node;
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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 = bootmem_init_node(node, mi);
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/*
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* Reserve any special node zero regions.
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*/
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if (node == 0)
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reserve_node_zero(NODE_DATA(node));
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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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bootmem_reserve_initrd(node);
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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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/*
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* sparse_init() needs the bootmem allocator up and running.
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*/
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sparse_init();
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/*
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* Now free memory in each node - free_area_init_node needs
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* the sparse mem_map arrays initialized by sparse_init()
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* for memmap_init_zone(), otherwise all PFNs are invalid.
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*/
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for_each_node(node)
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bootmem_free_node(node, mi);
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high_memory = __va((memend_pfn << PAGE_SHIFT) - 1) + 1;
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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 int free_area(unsigned long pfn, unsigned long end, char *s)
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{
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unsigned int pages = 0, size = (end - pfn) << (PAGE_SHIFT - 10);
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for (; pfn < end; pfn++) {
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struct page *page = pfn_to_page(pfn);
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ClearPageReserved(page);
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init_page_count(page);
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__free_page(page);
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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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return pages;
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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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struct membank *bank = &mi->bank[i];
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bank_start = bank_pfn_start(bank);
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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 = bank_pfn_end(bank);
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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 codesize, datasize, initsize;
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int i, node;
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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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totalram_pages += free_area(PHYS_PFN_OFFSET,
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__phys_to_pfn(__pa(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 += bank_pfn_size(&meminfo.bank[i]);
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printk(" %ldMB", bank_phys_size(&meminfo.bank[i]) >> 20);
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}
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printk(" = %luMB total\n", num_physpages >> (20 - PAGE_SHIFT));
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codesize = _etext - _text;
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datasize = _end - _data;
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initsize = __init_end - __init_begin;
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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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codesize >> 10, datasize >> 10, initsize >> 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)
|
|
{
|
|
if (!machine_is_integrator() && !machine_is_cintegrator())
|
|
totalram_pages += free_area(__phys_to_pfn(__pa(__init_begin)),
|
|
__phys_to_pfn(__pa(__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)
|
|
totalram_pages += free_area(__phys_to_pfn(__pa(start)),
|
|
__phys_to_pfn(__pa(end)),
|
|
"initrd");
|
|
}
|
|
|
|
static int __init keepinitrd_setup(char *__unused)
|
|
{
|
|
keep_initrd = 1;
|
|
return 1;
|
|
}
|
|
|
|
__setup("keepinitrd", keepinitrd_setup);
|
|
#endif
|