LXR linux/arch/score/mm/init.c

   1/*
   2 * arch/score/mm/init.c
   3 *
   4 * Score Processor version.
   5 *
   6 * Copyright (C) 2009 Sunplus Core Technology Co., Ltd.
   7 *  Lennox Wu <lennox.wu@sunplusct.com>
   8 *  Chen Liqin <liqin.chen@sunplusct.com>
   9 *
  10 * This program is free software; you can redistribute it and/or modify
  11 * it under the terms of the GNU General Public License as published by
  12 * the Free Software Foundation; either version 2 of the License, or
  13 * (at your option) any later version.
  14 *
  15 * This program is distributed in the hope that it will be useful,
  16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18 * GNU General Public License for more details.
  19 *
  20 * You should have received a copy of the GNU General Public License
  21 * along with this program; if not, see the file COPYING, or write
  22 * to the Free Software Foundation, Inc.,
  23 * 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  24 */
  25
  26#include <linux/errno.h>
  27#include <linux/bootmem.h>
  28#include <linux/kernel.h>
  29#include <linux/gfp.h>
  30#include <linux/init.h>
  31#include <linux/mm.h>
  32#include <linux/mman.h>
  33#include <linux/pagemap.h>
  34#include <linux/proc_fs.h>
  35#include <linux/sched.h>
  36#include <linux/initrd.h>
  37
  38#include <asm/sections.h>
  39#include <asm/tlb.h>
  40
  41DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
  42
  43unsigned long empty_zero_page;
  44EXPORT_SYMBOL_GPL(empty_zero_page);
  45
  46static struct kcore_list kcore_mem, kcore_vmalloc;
  47
  48static unsigned long setup_zero_page(void)
  49{
  50        struct page *page;
  51
  52        empty_zero_page = __get_free_pages(GFP_KERNEL | __GFP_ZERO, 0);
  53        if (!empty_zero_page)
  54                panic("Oh boy, that early out of memory?");
  55
  56        page = virt_to_page((void *) empty_zero_page);
  57        SetPageReserved(page);
  58
  59        return 1UL;
  60}
  61
  62#ifndef CONFIG_NEED_MULTIPLE_NODES
  63int page_is_ram(unsigned long pagenr)
  64{
  65        if (pagenr >= min_low_pfn && pagenr < max_low_pfn)
  66                return 1;
  67        else
  68                return 0;
  69}
  70
  71void __init paging_init(void)
  72{
  73        unsigned long max_zone_pfns[MAX_NR_ZONES];
  74        unsigned long lastpfn;
  75
  76        pagetable_init();
  77        max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
  78        lastpfn = max_low_pfn;
  79        free_area_init_nodes(max_zone_pfns);
  80}
  81
  82void __init mem_init(void)
  83{
  84        unsigned long codesize, reservedpages, datasize, initsize;
  85        unsigned long tmp, ram = 0;
  86
  87        high_memory = (void *) __va(max_low_pfn << PAGE_SHIFT);
  88        totalram_pages += free_all_bootmem();
  89        totalram_pages -= setup_zero_page();    /* Setup zeroed pages. */
  90        reservedpages = 0;
  91
  92        for (tmp = 0; tmp < max_low_pfn; tmp++)
  93                if (page_is_ram(tmp)) {
  94                        ram++;
  95                        if (PageReserved(pfn_to_page(tmp)))
  96                                reservedpages++;
  97                }
  98
  99        num_physpages = ram;
 100        codesize = (unsigned long) &_etext - (unsigned long) &_text;
 101        datasize = (unsigned long) &_edata - (unsigned long) &_etext;
 102        initsize = (unsigned long) &__init_end - (unsigned long) &__init_begin;
 103
 104        printk(KERN_INFO "Memory: %luk/%luk available (%ldk kernel code, "
 105                        "%ldk reserved, %ldk data, %ldk init, %ldk highmem)\n",
 106                        (unsigned long) nr_free_pages() << (PAGE_SHIFT-10),
 107                        ram << (PAGE_SHIFT-10), codesize >> 10,
 108                        reservedpages << (PAGE_SHIFT-10), datasize >> 10,
 109                        initsize >> 10,
 110                        totalhigh_pages << (PAGE_SHIFT-10));
 111}
 112#endif /* !CONFIG_NEED_MULTIPLE_NODES */
 113
 114static void free_init_pages(const char *what, unsigned long begin, unsigned long end)
 115{
 116        unsigned long pfn;
 117
 118        for (pfn = PFN_UP(begin); pfn < PFN_DOWN(end); pfn++) {
 119                struct page *page = pfn_to_page(pfn);
 120                void *addr = phys_to_virt(PFN_PHYS(pfn));
 121
 122                ClearPageReserved(page);
 123                init_page_count(page);
 124                memset(addr, POISON_FREE_INITMEM, PAGE_SIZE);
 125                __free_page(page);
 126                totalram_pages++;
 127        }
 128        printk(KERN_INFO "Freeing %s: %ldk freed\n", what, (end - begin) >> 10);
 129}
 130
 131#ifdef CONFIG_BLK_DEV_INITRD
 132void free_initrd_mem(unsigned long start, unsigned long end)
 133{
 134        free_init_pages("initrd memory",
 135                virt_to_phys((void *) start),
 136                virt_to_phys((void *) end));
 137}
 138#endif
 139
 140void __init_refok free_initmem(void)
 141{
 142        free_init_pages("unused kernel memory",
 143        __pa(&__init_begin),
 144        __pa(&__init_end));
 145}
 146
 147unsigned long pgd_current;
 148
 149#define __page_aligned(order) __attribute__((__aligned__(PAGE_SIZE<<order)))
 150
 151/*
 152 * gcc 3.3 and older have trouble determining that PTRS_PER_PGD and PGD_ORDER
 153 * are constants.  So we use the variants from asm-offset.h until that gcc
 154 * will officially be retired.
 155 */
 156pgd_t swapper_pg_dir[PTRS_PER_PGD] __page_aligned(PTE_ORDER);
 157pte_t invalid_pte_table[PTRS_PER_PTE] __page_aligned(PTE_ORDER);
 158