arch/m68k/mm/init_mm.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 #include <linux/gfp.h>
  21
  22 #include <asm/setup.h>
  23 #include <asm/uaccess.h>
  24 #include <asm/page.h>
  25 #include <asm/pgalloc.h>
  26 #include <asm/system.h>
  27 #include <asm/traps.h>
  28 #include <asm/machdep.h>
  29 #include <asm/io.h>
  30 #ifdef CONFIG_ATARI
  31 #include <asm/atari_stram.h>
  32 #endif
  33 #include <asm/sections.h>
  34 #include <asm/tlb.h>
  35
  36 pg_data_t pg_data_map[MAX_NUMNODES];
  37 EXPORT_SYMBOL(pg_data_map);
  38
  39 int m68k_virt_to_node_shift;
  40
  41 #ifndef CONFIG_SINGLE_MEMORY_CHUNK
  42 pg_data_t *pg_data_table[65];
  43 EXPORT_SYMBOL(pg_data_table);
  44 #endif
  45
  46 void __init m68k_setup_node(int node)
  47 {
  48 #ifndef CONFIG_SINGLE_MEMORY_CHUNK
  49         struct mem_info *info = m68k_memory + node;
  50         int i, end;
  51
  52         i = (unsigned long)phys_to_virt(info->addr) >> __virt_to_node_shift();
  53         end = (unsigned long)phys_to_virt(info->addr + info->size - 1) >> __virt_to_node_shift();
  54         for (; i <= end; i++) {
  55                 if (pg_data_table[i])
  56                         printk("overlap at %u for chunk %u\n", i, node);
  57                 pg_data_table[i] = pg_data_map + node;
  58         }
  59 #endif
  60         pg_data_map[node].bdata = bootmem_node_data + node;
  61         node_set_online(node);
  62 }
  63
  64
  65 /*
  66  * ZERO_PAGE is a special page that is used for zero-initialized
  67  * data and COW.
  68  */
  69
  70 void *empty_zero_page;
  71 EXPORT_SYMBOL(empty_zero_page);
  72
  73 extern void init_pointer_table(unsigned long ptable);
  74
  75 /* References to section boundaries */
  76
  77 extern pmd_t *zero_pgtable;
  78
  79 #if defined(CONFIG_MMU) && !defined(CONFIG_COLDFIRE)
  80 #define VECTORS &vectors[0]
  81 #else
  82 #define VECTORS _ramvec
  83 #endif
  84
  85 void __init print_memmap(void)
  86 {
  87 #define UL(x) ((unsigned long) (x))
  88 #define MLK(b, t) UL(b), UL(t), (UL(t) - UL(b)) >> 10
  89 #define MLM(b, t) UL(b), UL(t), (UL(t) - UL(b)) >> 20
  90 #define MLK_ROUNDUP(b, t) b, t, DIV_ROUND_UP(((t) - (b)), 1024)
  91
  92         pr_notice("Virtual kernel memory layout:\n"
  93                 "    vector  : 0x%08lx - 0x%08lx   (%4ld KiB)\n"
  94                 "    kmap    : 0x%08lx - 0x%08lx   (%4ld MiB)\n"
  95                 "    vmalloc : 0x%08lx - 0x%08lx   (%4ld MiB)\n"
  96                 "    lowmem  : 0x%08lx - 0x%08lx   (%4ld MiB)\n"
  97                 "      .init : 0x%p" " - 0x%p" "   (%4d KiB)\n"
  98                 "      .text : 0x%p" " - 0x%p" "   (%4d KiB)\n"
  99                 "      .data : 0x%p" " - 0x%p" "   (%4d KiB)\n"
 100                 "      .bss  : 0x%p" " - 0x%p" "   (%4d KiB)\n",
 101                 MLK(VECTORS, VECTORS + 256),
 102                 MLM(KMAP_START, KMAP_END),
 103                 MLM(VMALLOC_START, VMALLOC_END),
 104                 MLM(PAGE_OFFSET, (unsigned long)high_memory),
 105                 MLK_ROUNDUP(__init_begin, __init_end),
 106                 MLK_ROUNDUP(_stext, _etext),
 107                 MLK_ROUNDUP(_sdata, _edata),
 108                 MLK_ROUNDUP(_sbss, _ebss));
 109 }
 110
 111 void __init mem_init(void)
 112 {
 113         pg_data_t *pgdat;
 114         int codepages = 0;
 115         int datapages = 0;
 116         int initpages = 0;
 117         int i;
 118
 119         /* this will put all memory onto the freelists */
 120         totalram_pages = num_physpages = 0;
 121         for_each_online_pgdat(pgdat) {
 122                 num_physpages += pgdat->node_present_pages;
 123
 124                 totalram_pages += free_all_bootmem_node(pgdat);
 125                 for (i = 0; i < pgdat->node_spanned_pages; i++) {
 126                         struct page *page = pgdat->node_mem_map + i;
 127                         char *addr = page_to_virt(page);
 128
 129                         if (!PageReserved(page))
 130                                 continue;
 131                         if (addr >= _text &&
 132                             addr < _etext)
 133                                 codepages++;
 134                         else if (addr >= __init_begin &&
 135                                  addr < __init_end)
 136                                 initpages++;
 137                         else
 138                                 datapages++;
 139                 }
 140         }
 141
 142 #if !defined(CONFIG_SUN3) && !defined(CONFIG_COLDFIRE)
 143         /* insert pointer tables allocated so far into the tablelist */
 144         init_pointer_table((unsigned long)kernel_pg_dir);
 145         for (i = 0; i < PTRS_PER_PGD; i++) {
 146                 if (pgd_present(kernel_pg_dir[i]))
 147                         init_pointer_table(__pgd_page(kernel_pg_dir[i]));
 148         }
 149
 150         /* insert also pointer table that we used to unmap the zero page */
 151         if (zero_pgtable)
 152                 init_pointer_table((unsigned long)zero_pgtable);
 153 #endif
 154
 155         printk("Memory: %luk/%luk available (%dk kernel code, %dk data, %dk init)\n",
 156                nr_free_pages() << (PAGE_SHIFT-10),
 157                totalram_pages << (PAGE_SHIFT-10),
 158                codepages << (PAGE_SHIFT-10),
 159                datapages << (PAGE_SHIFT-10),
 160                initpages << (PAGE_SHIFT-10));
 161         print_memmap();
 162 }
 163
 164 #ifdef CONFIG_BLK_DEV_INITRD
 165 void free_initrd_mem(unsigned long start, unsigned long end)
 166 {
 167         int pages = 0;
 168         for (; start < end; start += PAGE_SIZE) {
 169                 ClearPageReserved(virt_to_page(start));
 170                 init_page_count(virt_to_page(start));
 171                 free_page(start);
 172                 totalram_pages++;
 173                 pages++;
 174         }
 175         printk ("Freeing initrd memory: %dk freed\n", pages);
 176 }
 177 #endif