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   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/machdep.h>
  28 #include <asm/io.h>
  29 #ifdef CONFIG_ATARI
  30 #include <asm/atari_stram.h>
  31 #endif
  32 #include <asm/sections.h>
  33 #include <asm/tlb.h>
  34
  35 DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
  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_node_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 EXPORT_SYMBOL(empty_zero_page);
  73
  74 extern void init_pointer_table(unsigned long ptable);
  75
  76 /* References to section boundaries */
  77
  78 extern pmd_t *zero_pgtable;
  79
  80 void __init mem_init(void)
  81 {
  82         pg_data_t *pgdat;
  83         int codepages = 0;
  84         int datapages = 0;
  85         int initpages = 0;
  86         int i;
  87
  88 #ifdef CONFIG_ATARI
  89         if (MACH_IS_ATARI)
  90                 atari_stram_mem_init_hook();
  91 #endif
  92
  93         /* this will put all memory onto the freelists */
  94         totalram_pages = num_physpages = 0;
  95         for_each_online_pgdat(pgdat) {
  96                 num_physpages += pgdat->node_present_pages;
  97
  98                 totalram_pages += free_all_bootmem_node(pgdat);
  99                 for (i = 0; i < pgdat->node_spanned_pages; i++) {
 100                         struct page *page = pgdat->node_mem_map + i;
 101                         char *addr = page_to_virt(page);
 102
 103                         if (!PageReserved(page))
 104                                 continue;
 105                         if (addr >= _text &&
 106                             addr < _etext)
 107                                 codepages++;
 108                         else if (addr >= __init_begin &&
 109                                  addr < __init_end)
 110                                 initpages++;
 111                         else
 112                                 datapages++;
 113                 }
 114         }
 115
 116 #ifndef CONFIG_SUN3
 117         /* insert pointer tables allocated so far into the tablelist */
 118         init_pointer_table((unsigned long)kernel_pg_dir);
 119         for (i = 0; i < PTRS_PER_PGD; i++) {
 120                 if (pgd_present(kernel_pg_dir[i]))
 121                         init_pointer_table(__pgd_page(kernel_pg_dir[i]));
 122         }
 123
 124         /* insert also pointer table that we used to unmap the zero page */
 125         if (zero_pgtable)
 126                 init_pointer_table((unsigned long)zero_pgtable);
 127 #endif
 128
 129         printk("Memory: %luk/%luk available (%dk kernel code, %dk data, %dk init)\n",
 130                nr_free_pages() << (PAGE_SHIFT-10),
 131                totalram_pages << (PAGE_SHIFT-10),
 132                codepages << (PAGE_SHIFT-10),
 133                datapages << (PAGE_SHIFT-10),
 134                initpages << (PAGE_SHIFT-10));
 135 }
 136
 137 #ifdef CONFIG_BLK_DEV_INITRD
 138 void free_initrd_mem(unsigned long start, unsigned long end)
 139 {
 140         int pages = 0;
 141         for (; start < end; start += PAGE_SIZE) {
 142                 ClearPageReserved(virt_to_page(start));
 143                 init_page_count(virt_to_page(start));
 144                 free_page(start);
 145                 totalram_pages++;
 146                 pages++;
 147         }
 148         printk ("Freeing initrd memory: %dk freed\n", pages);
 149 }
 150 #endif