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
  22 /*
  23  * ZERO_PAGE is a special page that is used for zero-initialized
  24  * data and COW.
  25  */
  26 unsigned long empty_zero_page;
  27 EXPORT_SYMBOL(empty_zero_page);
  28
  29 /*
  30  * paging_init() continues the virtual memory environment setup which
  31  * was begun by the code in arch/head.S.
  32  * The parameters are pointers to where to stick the starting and ending
  33  * addresses  of available kernel virtual memory.
  34  */
  35 void __init paging_init(void)
  36 {
  37         struct pglist_data *pgdat = NODE_DATA(0);
  38         unsigned long zones_size[MAX_NR_ZONES] = {0, };
  39
  40         empty_zero_page      = (unsigned long) alloc_bootmem_pages(PAGE_SIZE);
  41         memset((void *)empty_zero_page, 0, PAGE_SIZE);
  42
  43         /*
  44          * Set up user data space
  45          */
  46         set_fs(KERNEL_DS);
  47
  48         /*
  49          * Define zones
  50          */
  51         zones_size[ZONE_NORMAL] = (memory_end - PAGE_OFFSET) >> PAGE_SHIFT;
  52         pgdat->node_zones[ZONE_NORMAL].zone_start_pfn =
  53                 __pa(PAGE_OFFSET) >> PAGE_SHIFT;
  54
  55         free_area_init(zones_size);
  56 }
  57
  58 void __init mem_init(void)
  59 {
  60         int codek, datak;
  61         unsigned long tmp;
  62         unsigned long len = memory_end - memory_start;
  63
  64         high_memory = (void *)(memory_end & PAGE_MASK);
  65
  66         /* this will put all memory onto the freelists */
  67         totalram_pages = free_all_bootmem();
  68
  69         codek = (_etext - _stext) >> 10;
  70         datak = (_end - _sdata) >> 10;
  71
  72         tmp = nr_free_pages() << PAGE_SHIFT;
  73         printk(KERN_INFO "Memory: %luk/%luk RAM (%dk kernel code, %dk data)\n",
  74                tmp >> 10, len >> 10, codek, datak);
  75 }
  76
  77 #ifdef CONFIG_BLK_DEV_INITRD
  78 void __init free_initrd_mem(unsigned long start, unsigned long end)
  79 {
  80         int pages = 0;
  81         for (; start < end; start += PAGE_SIZE) {
  82                 ClearPageReserved(virt_to_page(start));
  83                 init_page_count(virt_to_page(start));
  84                 free_page(start);
  85                 totalram_pages++;
  86                 pages++;
  87         }
  88         printk(KERN_INFO "Freeing initrd memory: %luk freed\n",
  89                (pages * PAGE_SIZE) >> 10);
  90 }
  91 #endif
  92
  93 void __init free_initmem(void)
  94 {
  95         unsigned long addr;
  96
  97         /*
  98          * The following code should be cool even if these sections
  99          * are not page aligned.
 100          */
 101         addr = PAGE_ALIGN((unsigned long)(__init_begin));
 102
 103         /* next to check that the page we free is not a partial page */
 104         for (; addr + PAGE_SIZE < (unsigned long)(__init_end);
 105              addr += PAGE_SIZE) {
 106                 ClearPageReserved(virt_to_page(addr));
 107                 init_page_count(virt_to_page(addr));
 108                 free_page(addr);
 109                 totalram_pages++;
 110         }
 111         printk(KERN_INFO "Freeing unused kernel memory: %dK freed\n",
 112                (int) ((addr - PAGE_ALIGN((long) &__init_begin)) >> 10));
 113 }