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