forked from luck/tmp_suning_uos_patched
677 lines
16 KiB
C
677 lines
16 KiB
C
/*
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* linux/arch/arm/mm/init.c
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*
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* Copyright (C) 1995-2002 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/config.h>
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#include <linux/kernel.h>
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#include <linux/errno.h>
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#include <linux/ptrace.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/hardware.h>
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#include <asm/setup.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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#define TABLE_SIZE (2 * PTRS_PER_PTE * sizeof(pte_t))
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DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
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extern pgd_t swapper_pg_dir[PTRS_PER_PGD];
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extern void _stext, _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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* The sole use of this is to pass memory configuration
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* data from paging_init to mem_init.
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*/
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static struct meminfo meminfo __initdata = { 0, };
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/*
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* empty_zero_page is a special page that is used for
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* zero-initialized data and COW.
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*/
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struct page *empty_zero_page;
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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;
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printk("Mem-info:\n");
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show_free_areas();
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printk("Free swap: %6ldkB\n", nr_swap_pages<<(PAGE_SHIFT-10));
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for_each_online_node(node) {
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struct page *page, *end;
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page = NODE_MEM_MAP(node);
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end = page + NODE_DATA(node)->node_spanned_pages;
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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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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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struct node_info {
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unsigned int start;
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unsigned int end;
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int bootmap_pages;
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};
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#define O_PFN_DOWN(x) ((x) >> PAGE_SHIFT)
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#define O_PFN_UP(x) (PAGE_ALIGN(x) >> PAGE_SHIFT)
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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 = O_PFN_UP(__pa(&_end));
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bootmap_pfn = 0;
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for (bank = 0; bank < mi->nr_banks; bank ++) {
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unsigned int start, end;
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if (mi->bank[bank].node != node)
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continue;
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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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/*
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* Scan the memory info structure and pull out:
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* - the end of memory
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* - the number of nodes
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* - the pfn range of each node
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* - the number of bootmem bitmap pages
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*/
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static unsigned int __init
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find_memend_and_nodes(struct meminfo *mi, struct node_info *np)
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{
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unsigned int i, bootmem_pages = 0, memend_pfn = 0;
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for (i = 0; i < MAX_NUMNODES; i++) {
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np[i].start = -1U;
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np[i].end = 0;
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np[i].bootmap_pages = 0;
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}
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for (i = 0; i < mi->nr_banks; i++) {
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unsigned long start, end;
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int node;
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if (mi->bank[i].size == 0) {
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/*
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* Mark this bank with an invalid node number
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*/
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mi->bank[i].node = -1;
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continue;
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}
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node = mi->bank[i].node;
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/*
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* Make sure we haven't exceeded the maximum number of nodes
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* that we have in this configuration. If we have, we're in
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* trouble. (maybe we ought to limit, instead of bugging?)
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*/
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if (node >= MAX_NUMNODES)
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BUG();
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node_set_online(node);
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/*
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* Get the start and end pfns for this bank
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*/
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start = mi->bank[i].start >> PAGE_SHIFT;
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end = (mi->bank[i].start + mi->bank[i].size) >> PAGE_SHIFT;
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if (np[node].start > start)
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np[node].start = start;
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if (np[node].end < end)
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np[node].end = end;
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if (memend_pfn < end)
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memend_pfn = end;
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}
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/*
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* Calculate the number of pages we require to
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* store the bootmem bitmaps.
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*/
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for_each_online_node(i) {
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if (np[i].end == 0)
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continue;
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np[i].bootmap_pages = bootmem_bootmap_pages(np[i].end -
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np[i].start);
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bootmem_pages += np[i].bootmap_pages;
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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
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* manager any more. 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
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* of _pages_ in the system, not the maximum PFN.
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*/
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max_low_pfn = memend_pfn - O_PFN_DOWN(PHYS_OFFSET);
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max_pfn = memend_pfn - O_PFN_DOWN(PHYS_OFFSET);
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return bootmem_pages;
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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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/*
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* Reserve the various regions of node 0
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*/
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static __init void reserve_node_zero(unsigned int bootmap_pfn, unsigned int bootmap_pages)
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{
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pg_data_t *pgdat = NODE_DATA(0);
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unsigned long res_size = 0;
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/*
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* Register the kernel text and data with bootmem.
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* Note that this can only be in node 0.
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*/
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#ifdef CONFIG_XIP_KERNEL
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reserve_bootmem_node(pgdat, __pa(&__data_start), &_end - &__data_start);
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#else
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reserve_bootmem_node(pgdat, __pa(&_stext), &_end - &_stext);
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#endif
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/*
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* Reserve the page tables. These are already in use,
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* and can only be in node 0.
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*/
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reserve_bootmem_node(pgdat, __pa(swapper_pg_dir),
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PTRS_PER_PGD * sizeof(pgd_t));
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/*
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* And don't forget to reserve the allocator bitmap,
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* which will be freed later.
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*/
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reserve_bootmem_node(pgdat, bootmap_pfn << PAGE_SHIFT,
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bootmap_pages << PAGE_SHIFT);
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/*
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* Hmm... This should go elsewhere, but we really really need to
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* stop things allocating the low memory; ideally we need a better
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* implementation of GFP_DMA which does not assume that DMA-able
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* memory starts at zero.
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*/
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if (machine_is_integrator() || machine_is_cintegrator())
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res_size = __pa(swapper_pg_dir) - PHYS_OFFSET;
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/*
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* These should likewise go elsewhere. They pre-reserve the
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* screen memory region at the start of main system memory.
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*/
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if (machine_is_edb7211())
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res_size = 0x00020000;
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if (machine_is_p720t())
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res_size = 0x00014000;
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#ifdef CONFIG_SA1111
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/*
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* Because of the SA1111 DMA bug, we want to preserve our
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* precious DMA-able memory...
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*/
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res_size = __pa(swapper_pg_dir) - PHYS_OFFSET;
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#endif
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if (res_size)
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reserve_bootmem_node(pgdat, PHYS_OFFSET, res_size);
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}
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/*
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* Register all available RAM in this node with the bootmem allocator.
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*/
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static inline void free_bootmem_node_bank(int node, struct meminfo *mi)
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{
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pg_data_t *pgdat = NODE_DATA(node);
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int bank;
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for (bank = 0; bank < mi->nr_banks; bank++)
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if (mi->bank[bank].node == node)
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free_bootmem_node(pgdat, mi->bank[bank].start,
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mi->bank[bank].size);
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}
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/*
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* Initialise the bootmem allocator for all nodes. This is called
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* early during the architecture specific initialisation.
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*/
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static void __init bootmem_init(struct meminfo *mi)
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{
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struct node_info node_info[MAX_NUMNODES], *np = node_info;
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unsigned int bootmap_pages, bootmap_pfn, map_pg;
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int node, initrd_node;
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bootmap_pages = find_memend_and_nodes(mi, np);
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bootmap_pfn = find_bootmap_pfn(0, mi, bootmap_pages);
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initrd_node = check_initrd(mi);
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map_pg = bootmap_pfn;
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/*
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* Initialise the bootmem nodes.
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*
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* What we really want to do is:
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*
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* unmap_all_regions_except_kernel();
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* for_each_node_in_reverse_order(node) {
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* map_node(node);
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* allocate_bootmem_map(node);
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* init_bootmem_node(node);
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* free_bootmem_node(node);
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* }
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*
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* but this is a 2.5-type change. For now, we just set
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* the nodes up in reverse order.
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*
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* (we could also do with rolling bootmem_init and paging_init
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* into one generic "memory_init" type function).
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*/
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np += num_online_nodes() - 1;
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for (node = num_online_nodes() - 1; node >= 0; node--, np--) {
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/*
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* If there are no pages in this node, ignore it.
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* Note that node 0 must always have some pages.
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*/
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if (np->end == 0 || !node_online(node)) {
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if (node == 0)
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BUG();
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continue;
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}
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/*
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* Initialise the bootmem allocator.
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*/
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init_bootmem_node(NODE_DATA(node), map_pg, np->start, np->end);
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free_bootmem_node_bank(node, mi);
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map_pg += np->bootmap_pages;
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/*
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* If this is node 0, we need to reserve some areas ASAP -
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* we may use bootmem on node 0 to setup the other nodes.
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*/
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if (node == 0)
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reserve_node_zero(bootmap_pfn, bootmap_pages);
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}
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#ifdef CONFIG_BLK_DEV_INITRD
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if (phys_initrd_size && initrd_node >= 0) {
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reserve_bootmem_node(NODE_DATA(initrd_node), phys_initrd_start,
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phys_initrd_size);
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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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BUG_ON(map_pg != bootmap_pfn + bootmap_pages);
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}
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/*
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* paging_init() sets up the page tables, initialises the zone memory
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* maps, and sets up the zero page, bad page and bad page tables.
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*/
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void __init paging_init(struct meminfo *mi, struct machine_desc *mdesc)
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{
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void *zero_page;
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int node;
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bootmem_init(mi);
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memcpy(&meminfo, mi, sizeof(meminfo));
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/*
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* allocate the zero page. Note that we count on this going ok.
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*/
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zero_page = alloc_bootmem_low_pages(PAGE_SIZE);
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/*
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* initialise the page tables.
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*/
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memtable_init(mi);
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if (mdesc->map_io)
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mdesc->map_io();
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local_flush_tlb_all();
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/*
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* initialise the zones within each node
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*/
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for_each_online_node(node) {
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unsigned long zone_size[MAX_NR_ZONES];
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unsigned long zhole_size[MAX_NR_ZONES];
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struct bootmem_data *bdata;
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pg_data_t *pgdat;
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int i;
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/*
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* Initialise the zone size information.
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*/
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for (i = 0; i < MAX_NR_ZONES; i++) {
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zone_size[i] = 0;
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zhole_size[i] = 0;
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}
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pgdat = NODE_DATA(node);
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bdata = pgdat->bdata;
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/*
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* The size of this node has already been determined.
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* If we need to do anything fancy with the allocation
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* of this memory to the zones, now is the time to do
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* it.
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*/
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zone_size[0] = bdata->node_low_pfn -
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(bdata->node_boot_start >> PAGE_SHIFT);
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/*
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* If this zone has zero size, skip it.
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*/
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if (!zone_size[0])
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continue;
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/*
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* For each bank in this node, calculate the size of the
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* holes. 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 (i = 0; i < mi->nr_banks; i++) {
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if (mi->bank[i].node != node)
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continue;
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zhole_size[0] -= mi->bank[i].size >> PAGE_SHIFT;
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}
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/*
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* Adjust the sizes according to any special
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* requirements for 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,
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bdata->node_boot_start >> PAGE_SHIFT, zhole_size);
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}
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/*
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* finish off the bad pages once
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* the mem_map is initialised
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*/
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memzero(zero_page, PAGE_SIZE);
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empty_zero_page = virt_to_page(zero_page);
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flush_dcache_page(empty_zero_page);
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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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set_page_count(page, 1);
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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;
|
|
|
|
/*
|
|
* 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 (i = 0; i < mi->nr_banks; i++) {
|
|
if (mi->bank[i].size == 0 || mi->bank[i].node != node)
|
|
continue;
|
|
|
|
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
|