LXR linux/arch/c6x/mm/init.c

   1/*
   2 *  Port on Texas Instruments TMS320C6x architecture
   3 *
   4 *  Copyright (C) 2004, 2009, 2010, 2011 Texas Instruments Incorporated
   5 *  Author: Aurelien Jacquiot (aurelien.jacquiot@jaluna.com)
   6 *
   7 *  This program is free software; you can redistribute it and/or modify
   8 *  it under the terms of the GNU General Public License version 2 as
   9 *  published by the Free Software Foundation.
  10 */
  11#include <linux/mm.h>
  12#include <linux/swap.h>
  13#include <linux/module.h>
  14#include <linux/bootmem.h>
  15#ifdef CONFIG_BLK_DEV_RAM
  16#include <linux/blkdev.h>
  17#endif
  18#include <linux/initrd.h>
  19
  20#include <asm/sections.h>
  21#include <asm/uaccess.h>
  22
  23/*
  24 * ZERO_PAGE is a special page that is used for zero-initialized
  25 * data and COW.
  26 */
  27unsigned long empty_zero_page;
  28EXPORT_SYMBOL(empty_zero_page);
  29
  30/*
  31 * paging_init() continues the virtual memory environment setup which
  32 * was begun by the code in arch/head.S.
  33 * The parameters are pointers to where to stick the starting and ending
  34 * addresses  of available kernel virtual memory.
  35 */
  36void __init paging_init(void)
  37{
  38        struct pglist_data *pgdat = NODE_DATA(0);
  39        unsigned long zones_size[MAX_NR_ZONES] = {0, };
  40
  41        empty_zero_page      = (unsigned long) alloc_bootmem_pages(PAGE_SIZE);
  42        memset((void *)empty_zero_page, 0, PAGE_SIZE);
  43
  44        /*
  45         * Set up user data space
  46         */
  47        set_fs(KERNEL_DS);
  48
  49        /*
  50         * Define zones
  51         */
  52        zones_size[ZONE_NORMAL] = (memory_end - PAGE_OFFSET) >> PAGE_SHIFT;
  53        pgdat->node_zones[ZONE_NORMAL].zone_start_pfn =
  54                __pa(PAGE_OFFSET) >> PAGE_SHIFT;
  55
  56        free_area_init(zones_size);
  57}
  58
  59void __init mem_init(void)
  60{
  61        high_memory = (void *)(memory_end & PAGE_MASK);
  62
  63        /* this will put all memory onto the freelists */
  64        free_all_bootmem();
  65
  66        mem_init_print_info(NULL);
  67}
  68
  69#ifdef CONFIG_BLK_DEV_INITRD
  70void __init free_initrd_mem(unsigned long start, unsigned long end)
  71{
  72        free_reserved_area((void *)start, (void *)end, -1, "initrd");
  73}
  74#endif
  75
  76void __init free_initmem(void)
  77{
  78        free_initmem_default(-1);
  79}
  80