release/src-rt-6.x.4708/linux/linux-2.6.36/arch/cris/mm/init.c

   1 /*
   2  *  linux/arch/cris/mm/init.c
   3  *
   4  *  Copyright (C) 1995  Linus Torvalds
   5  *  Copyright (C) 2000,2001  Axis Communications AB
   6  *
   7  *  Authors:  Bjorn Wesen (bjornw@axis.com)
   8  *
   9  */
  10
  11 #include <linux/gfp.h>
  12 #include <linux/init.h>
  13 #include <linux/bootmem.h>
  14 #include <asm/tlb.h>
  15
  16 DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
  17
  18 unsigned long empty_zero_page;
  19
  20 extern char _stext, _edata, _etext; /* From linkerscript */
  21 extern char __init_begin, __init_end;
  22
  23 void __init
  24 mem_init(void)
  25 {
  26         int codesize, reservedpages, datasize, initsize;
  27         unsigned long tmp;
  28
  29         BUG_ON(!mem_map);
  30
  31         /* max/min_low_pfn was set by setup.c
  32          * now we just copy it to some other necessary places...
  33          *
  34          * high_memory was also set in setup.c
  35          */
  36
  37         max_mapnr = num_physpages = max_low_pfn - min_low_pfn;
  38
  39         /* this will put all memory onto the freelists */
  40         totalram_pages = free_all_bootmem();
  41
  42         reservedpages = 0;
  43         for (tmp = 0; tmp < max_mapnr; tmp++) {
  44                 /*
  45                  * Only count reserved RAM pages
  46                  */
  47                 if (PageReserved(mem_map + tmp))
  48                         reservedpages++;
  49         }
  50
  51         codesize =  (unsigned long) &_etext - (unsigned long) &_stext;
  52         datasize =  (unsigned long) &_edata - (unsigned long) &_etext;
  53         initsize =  (unsigned long) &__init_end - (unsigned long) &__init_begin;
  54
  55         printk(KERN_INFO
  56                "Memory: %luk/%luk available (%dk kernel code, %dk reserved, %dk data, "
  57                "%dk init)\n" ,
  58                nr_free_pages() << (PAGE_SHIFT-10),
  59                max_mapnr << (PAGE_SHIFT-10),
  60                codesize >> 10,
  61                reservedpages << (PAGE_SHIFT-10),
  62                datasize >> 10,
  63                initsize >> 10
  64                );
  65 }
  66
  67 /* free the pages occupied by initialization code */
  68
  69 void
  70 free_initmem(void)
  71 {
  72         unsigned long addr;
  73
  74         addr = (unsigned long)(&__init_begin);
  75         for (; addr < (unsigned long)(&__init_end); addr += PAGE_SIZE) {
  76                 ClearPageReserved(virt_to_page(addr));
  77                 init_page_count(virt_to_page(addr));
  78                 free_page(addr);
  79                 totalram_pages++;
  80         }
  81         printk (KERN_INFO "Freeing unused kernel memory: %luk freed\n",
  82                 (unsigned long)((&__init_end - &__init_begin) >> 10));
  83 }