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  */
  27 unsigned long empty_zero_page;
  28 EXPORT_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  */
  36 void __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
  59 void __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
  70 void __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
  76 void __init free_initmem(void)
  77 {
  78         free_initmem_default(-1);
  79 }