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  *  $Log: init.c,v $
  10  *  Revision 1.11  2004/05/28 09:28:56  starvik
  11  *  Calculation of loops_per_usec moved because initialization order has changed
  12  *  in Linux 2.6.
  13  *
  14  *  Revision 1.10  2004/05/14 07:58:05  starvik
  15  *  Merge of changes from 2.4
  16  *
  17  *  Revision 1.9  2003/07/04 08:27:54  starvik
  18  *  Merge of Linux 2.5.74
  19  *
  20  *  Revision 1.8  2003/04/09 05:20:48  starvik
  21  *  Merge of Linux 2.5.67
  22  *
  23  *  Revision 1.7  2003/01/22 06:48:38  starvik
  24  *  Fixed warnings issued by GCC 3.2.1
  25  *
  26  *  Revision 1.6  2002/12/11 14:44:48  starvik
  27  *  Extracted v10 (ETRAX 100LX) specific stuff to arch/cris/arch-v10/mm
  28  *
  29  *  Revision 1.5  2002/11/18 07:37:37  starvik
  30  *  Added cache bug workaround (from Linux 2.4)
  31  *
  32  *  Revision 1.4  2002/11/13 15:40:24  starvik
  33  *  Removed the page table cache stuff (as done in other archs)
  34  *
  35  *  Revision 1.3  2002/11/05 06:45:13  starvik
  36  *  Merge of Linux 2.5.45
  37  *
  38  *  Revision 1.2  2001/12/18 13:35:22  bjornw
  39  *  Applied the 2.4.13->2.4.16 CRIS patch to 2.5.1 (is a copy of 2.4.15).
  40  *
  41  *  Revision 1.31  2001/11/13 16:22:00  bjornw
  42  *  Skip calculating totalram and sharedram in si_meminfo
  43  *
  44  *  Revision 1.30  2001/11/12 19:02:10  pkj
  45  *  Fixed compiler warnings.
  46  *
  47  *  Revision 1.29  2001/07/25 16:09:50  bjornw
  48  *  val->sharedram will stay 0
  49  *
  50  *  Revision 1.28  2001/06/28 16:30:17  bjornw
  51  *  Oops. This needs to wait until 2.4.6 is merged
  52  *
  53  *  Revision 1.27  2001/06/28 14:04:07  bjornw
  54  *  Fill in sharedram
  55  *
  56  *  Revision 1.26  2001/06/18 06:36:02  hp
  57  *  Enable free_initmem of __init-type pages
  58  *
  59  *  Revision 1.25  2001/06/13 00:02:23  bjornw
  60  *  Use a separate variable to store the current pgd to avoid races in schedule
  61  *
  62  *  Revision 1.24  2001/05/15 00:52:20  hp
  63  *  Only map segment 0xa as seg if CONFIG_JULIETTE
  64  *
  65  *  Revision 1.23  2001/04/04 14:35:40  bjornw
  66  *  * Removed get_pte_slow and friends (2.4.3 change)
  67  *  * Removed bad_pmd handling (2.4.3 change)
  68  *
  69  *  Revision 1.22  2001/04/04 13:38:04  matsfg
  70  *  Moved ioremap to a separate function instead
  71  *
  72  *  Revision 1.21  2001/03/27 09:28:33  bjornw
  73  *  ioremap used too early - lets try it in mem_init instead
  74  *
  75  *  Revision 1.20  2001/03/23 07:39:21  starvik
  76  *  Corrected according to review remarks
  77  *
  78  *  Revision 1.19  2001/03/15 14:25:17  bjornw
  79  *  More general shadow registers and ioremaped addresses for external I/O
  80  *
  81  *  Revision 1.18  2001/02/23 12:46:44  bjornw
  82  *  * 0xc was not CSE1; 0x8 is, same as uncached flash, so we move the uncached
  83  *    flash during CRIS_LOW_MAP from 0xe to 0x8 so both the flash and the I/O
  84  *    is mapped straight over (for !CRIS_LOW_MAP the uncached flash is still 0xe)
  85  *
  86  *  Revision 1.17  2001/02/22 15:05:21  bjornw
  87  *  Map 0x9 straight over during LOW_MAP to allow for memory mapped LEDs
  88  *
  89  *  Revision 1.16  2001/02/22 15:02:35  bjornw
  90  *  Map 0xc straight over during LOW_MAP to allow for memory mapped I/O
  91  *
  92  *  Revision 1.15  2001/01/10 21:12:10  bjornw
  93  *  loops_per_sec -> loops_per_jiffy
  94  *
  95  *  Revision 1.14  2000/11/22 16:23:20  bjornw
  96  *  Initialize totalhigh counters to 0 to make /proc/meminfo look nice.
  97  *
  98  *  Revision 1.13  2000/11/21 16:37:51  bjornw
  99  *  Temporarily disable initmem freeing
 100  *
 101  *  Revision 1.12  2000/11/21 13:55:07  bjornw
 102  *  Use CONFIG_CRIS_LOW_MAP for the low VM map instead of explicit CPU type
 103  *
 104  *  Revision 1.11  2000/10/06 12:38:22  bjornw
 105  *  Cast empty_bad_page correctly (should really be of * type from the start..
 106  *
 107  *  Revision 1.10  2000/10/04 16:53:57  bjornw
 108  *  Fix memory-map due to LX features
 109  *
 110  *  Revision 1.9  2000/09/13 15:47:49  bjornw
 111  *  Wrong count in reserved-pages loop
 112  *
 113  *  Revision 1.8  2000/09/13 14:35:10  bjornw
 114  *  2.4.0-test8 added a new arg to free_area_init_node
 115  *
 116  *  Revision 1.7  2000/08/17 15:35:55  bjornw
 117  *  2.4.0-test6 removed MAP_NR and inserted virt_to_page
 118  *
 119  *
 120  */
 121
 122 #include <linux/init.h>
 123 #include <linux/bootmem.h>
 124 #include <asm/tlb.h>
 125
 126 DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
 127
 128 unsigned long empty_zero_page;
 129
 130 extern char _stext, _edata, _etext; /* From linkerscript */
 131 extern char __init_begin, __init_end;
 132
 133 void
 134 show_mem(void)
 135 {
 136         int i,free = 0,total = 0,cached = 0, reserved = 0, nonshared = 0;
 137         int shared = 0;
 138
 139         printk("\nMem-info:\n");
 140         show_free_areas();
 141         printk("Free swap:       %6ldkB\n", nr_swap_pages<<(PAGE_SHIFT-10));
 142         i = max_mapnr;
 143         while (i-- > 0) {
 144                 total++;
 145                 if (PageReserved(mem_map+i))
 146                         reserved++;
 147                 else if (PageSwapCache(mem_map+i))
 148                         cached++;
 149                 else if (!page_count(mem_map+i))
 150                         free++;
 151                 else if (page_count(mem_map+i) == 1)
 152                         nonshared++;
 153                 else
 154                         shared += page_count(mem_map+i) - 1;
 155         }
 156         printk("%d pages of RAM\n",total);
 157         printk("%d free pages\n",free);
 158         printk("%d reserved pages\n",reserved);
 159         printk("%d pages nonshared\n",nonshared);
 160         printk("%d pages shared\n",shared);
 161         printk("%d pages swap cached\n",cached);
 162 }
 163
 164 void __init
 165 mem_init(void)
 166 {
 167         int codesize, reservedpages, datasize, initsize;
 168         unsigned long tmp;
 169
 170         if(!mem_map)
 171                 BUG();
 172
 173         /* max/min_low_pfn was set by setup.c
 174          * now we just copy it to some other necessary places...
 175          *
 176          * high_memory was also set in setup.c
 177          */
 178
 179         max_mapnr = num_physpages = max_low_pfn - min_low_pfn;
 180
 181         /* this will put all memory onto the freelists */
 182         totalram_pages = free_all_bootmem();
 183
 184         reservedpages = 0;
 185         for (tmp = 0; tmp < max_mapnr; tmp++) {
 186                 /*
 187                  * Only count reserved RAM pages
 188                  */
 189                 if (PageReserved(mem_map + tmp))
 190                         reservedpages++;
 191         }
 192
 193         codesize =  (unsigned long) &_etext - (unsigned long) &_stext;
 194         datasize =  (unsigned long) &_edata - (unsigned long) &_etext;
 195         initsize =  (unsigned long) &__init_end - (unsigned long) &__init_begin;
 196
 197         printk(KERN_INFO
 198                "Memory: %luk/%luk available (%dk kernel code, %dk reserved, %dk data, "
 199                "%dk init)\n" ,
 200                (unsigned long) nr_free_pages() << (PAGE_SHIFT-10),
 201                max_mapnr << (PAGE_SHIFT-10),
 202                codesize >> 10,
 203                reservedpages << (PAGE_SHIFT-10),
 204                datasize >> 10,
 205                initsize >> 10
 206                );
 207 }
 208
 209 /* free the pages occupied by initialization code */
 210
 211 void
 212 free_initmem(void)
 213 {
 214         unsigned long addr;
 215
 216         addr = (unsigned long)(&__init_begin);
 217         for (; addr < (unsigned long)(&__init_end); addr += PAGE_SIZE) {
 218                 ClearPageReserved(virt_to_page(addr));
 219                 init_page_count(virt_to_page(addr));
 220                 free_page(addr);
 221                 totalram_pages++;
 222         }
 223         printk (KERN_INFO "Freeing unused kernel memory: %luk freed\n",
 224                 (unsigned long)((&__init_end - &__init_begin) >> 10));
 225 }