arch/m68k/mm/init.c

   1 /*
   2  *  linux/arch/m68k/mm/init.c
   3  *
   4  *  Copyright (C) 1995  Hamish Macdonald
   5  *
   6  *  Contains common initialization routines, specific init code moved
   7  *  to motorola.c and sun3mmu.c
   8  */
   9
  10 #include <linux/module.h>
  11 #include <linux/signal.h>
  12 #include <linux/sched.h>
  13 #include <linux/mm.h>
  14 #include <linux/swap.h>
  15 #include <linux/kernel.h>
  16 #include <linux/string.h>
  17 #include <linux/types.h>
  18 #include <linux/init.h>
  19 #include <linux/bootmem.h>
  20
  21 #include <asm/setup.h>
  22 #include <asm/uaccess.h>
  23 #include <asm/page.h>
  24 #include <asm/pgalloc.h>
  25 #include <asm/system.h>
  26 #include <asm/machdep.h>
  27 #include <asm/io.h>
  28 #ifdef CONFIG_ATARI
  29 #include <asm/atari_stram.h>
  30 #endif
  31 #include <asm/tlb.h>
  32
  33 DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
  34
  35 static bootmem_data_t __initdata bootmem_data[MAX_NUMNODES];
  36
  37 pg_data_t pg_data_map[MAX_NUMNODES];
  38 EXPORT_SYMBOL(pg_data_map);
  39
  40 int m68k_virt_to_node_shift;
  41
  42 #ifndef CONFIG_SINGLE_MEMORY_CHUNK
  43 pg_data_t *pg_data_table[65];
  44 EXPORT_SYMBOL(pg_data_table);
  45 #endif
  46
  47 void __init m68k_setup_node(int node)
  48 {
  49 #ifndef CONFIG_SINGLE_MEMORY_CHUNK
  50         struct mem_info *info = m68k_memory + node;
  51         int i, end;
  52
  53         i = (unsigned long)phys_to_virt(info->addr) >> __virt_to_node_shift();
  54         end = (unsigned long)phys_to_virt(info->addr + info->size - 1) >> __virt_to_node_shift();
  55         for (; i <= end; i++) {
  56                 if (pg_data_table[i])
  57                         printk("overlap at %u for chunk %u\n", i, node);
  58                 pg_data_table[i] = pg_data_map + node;
  59         }
  60 #endif
  61         pg_data_map[node].bdata = bootmem_data + node;
  62         node_set_online(node);
  63 }
  64
  65
  66 /*
  67  * ZERO_PAGE is a special page that is used for zero-initialized
  68  * data and COW.
  69  */
  70
  71 void *empty_zero_page;
  72
  73 void show_mem(void)
  74 {
  75         pg_data_t *pgdat;
  76         int free = 0, total = 0, reserved = 0, shared = 0;
  77         int cached = 0;
  78         int i;
  79
  80         printk("\nMem-info:\n");
  81         show_free_areas();
  82         printk("Free swap:       %6ldkB\n", nr_swap_pages<<(PAGE_SHIFT-10));
  83         for_each_online_pgdat(pgdat) {
  84                 for (i = 0; i < pgdat->node_spanned_pages; i++) {
  85                         struct page *page = pgdat->node_mem_map + i;
  86                         total++;
  87                         if (PageReserved(page))
  88                                 reserved++;
  89                         else if (PageSwapCache(page))
  90                                 cached++;
  91                         else if (!page_count(page))
  92                                 free++;
  93                         else
  94                                 shared += page_count(page) - 1;
  95                 }
  96         }
  97         printk("%d pages of RAM\n",total);
  98         printk("%d free pages\n",free);
  99         printk("%d reserved pages\n",reserved);
 100         printk("%d pages shared\n",shared);
 101         printk("%d pages swap cached\n",cached);
 102 }
 103
 104 extern void init_pointer_table(unsigned long ptable);
 105
 106 /* References to section boundaries */
 107
 108 extern char _text[], _etext[];
 109 extern char __init_begin[], __init_end[];
 110
 111 extern pmd_t *zero_pgtable;
 112
 113 void __init mem_init(void)
 114 {
 115         pg_data_t *pgdat;
 116         int codepages = 0;
 117         int datapages = 0;
 118         int initpages = 0;
 119         int i;
 120
 121 #ifdef CONFIG_ATARI
 122         if (MACH_IS_ATARI)
 123                 atari_stram_mem_init_hook();
 124 #endif
 125
 126         /* this will put all memory onto the freelists */
 127         totalram_pages = num_physpages = 0;
 128         for_each_online_pgdat(pgdat) {
 129                 num_physpages += pgdat->node_present_pages;
 130
 131                 totalram_pages += free_all_bootmem_node(pgdat);
 132                 for (i = 0; i < pgdat->node_spanned_pages; i++) {
 133                         struct page *page = pgdat->node_mem_map + i;
 134                         char *addr = page_to_virt(page);
 135
 136                         if (!PageReserved(page))
 137                                 continue;
 138                         if (addr >= _text &&
 139                             addr < _etext)
 140                                 codepages++;
 141                         else if (addr >= __init_begin &&
 142                                  addr < __init_end)
 143                                 initpages++;
 144                         else
 145                                 datapages++;
 146                 }
 147         }
 148
 149 #ifndef CONFIG_SUN3
 150         /* insert pointer tables allocated so far into the tablelist */
 151         init_pointer_table((unsigned long)kernel_pg_dir);
 152         for (i = 0; i < PTRS_PER_PGD; i++) {
 153                 if (pgd_present(kernel_pg_dir[i]))
 154                         init_pointer_table(__pgd_page(kernel_pg_dir[i]));
 155         }
 156
 157         /* insert also pointer table that we used to unmap the zero page */
 158         if (zero_pgtable)
 159                 init_pointer_table((unsigned long)zero_pgtable);
 160 #endif
 161
 162         printk("Memory: %luk/%luk available (%dk kernel code, %dk data, %dk init)\n",
 163                (unsigned long)nr_free_pages() << (PAGE_SHIFT-10),
 164                totalram_pages << (PAGE_SHIFT-10),
 165                codepages << (PAGE_SHIFT-10),
 166                datapages << (PAGE_SHIFT-10),
 167                initpages << (PAGE_SHIFT-10));
 168 }
 169
 170 #ifdef CONFIG_BLK_DEV_INITRD
 171 void free_initrd_mem(unsigned long start, unsigned long end)
 172 {
 173         int pages = 0;
 174         for (; start < end; start += PAGE_SIZE) {
 175                 ClearPageReserved(virt_to_page(start));
 176                 init_page_count(virt_to_page(start));
 177                 free_page(start);
 178                 totalram_pages++;
 179                 pages++;
 180         }
 181         printk ("Freeing initrd memory: %dk freed\n", pages);
 182 }
 183 #endif