LXR linux/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#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/traps.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/*
  36 * ZERO_PAGE is a special page that is used for zero-initialized
  37 * data and COW.
  38 */
  39void *empty_zero_page;
  40EXPORT_SYMBOL(empty_zero_page);
  41
  42#if !defined(CONFIG_SUN3) && !defined(CONFIG_COLDFIRE)
  43extern void init_pointer_table(unsigned long ptable);
  44extern pmd_t *zero_pgtable;
  45#endif
  46
  47#ifdef CONFIG_MMU
  48
  49pg_data_t pg_data_map[MAX_NUMNODES];
  50EXPORT_SYMBOL(pg_data_map);
  51
  52int m68k_virt_to_node_shift;
  53
  54#ifndef CONFIG_SINGLE_MEMORY_CHUNK
  55pg_data_t *pg_data_table[65];
  56EXPORT_SYMBOL(pg_data_table);
  57#endif
  58
  59void __init m68k_setup_node(int node)
  60{
  61#ifndef CONFIG_SINGLE_MEMORY_CHUNK
  62        struct mem_info *info = m68k_memory + node;
  63        int i, end;
  64
  65        i = (unsigned long)phys_to_virt(info->addr) >> __virt_to_node_shift();
  66        end = (unsigned long)phys_to_virt(info->addr + info->size - 1) >> __virt_to_node_shift();
  67        for (; i <= end; i++) {
  68                if (pg_data_table[i])
  69                        printk("overlap at %u for chunk %u\n", i, node);
  70                pg_data_table[i] = pg_data_map + node;
  71        }
  72#endif
  73        pg_data_map[node].bdata = bootmem_node_data + node;
  74        node_set_online(node);
  75}
  76
  77#else /* CONFIG_MMU */
  78
  79/*
  80 * paging_init() continues the virtual memory environment setup which
  81 * was begun by the code in arch/head.S.
  82 * The parameters are pointers to where to stick the starting and ending
  83 * addresses of available kernel virtual memory.
  84 */
  85void __init paging_init(void)
  86{
  87        /*
  88         * Make sure start_mem is page aligned, otherwise bootmem and
  89         * page_alloc get different views of the world.
  90         */
  91        unsigned long end_mem = memory_end & PAGE_MASK;
  92        unsigned long zones_size[MAX_NR_ZONES] = { 0, };
  93
  94        high_memory = (void *) end_mem;
  95
  96        empty_zero_page = alloc_bootmem_pages(PAGE_SIZE);
  97        memset(empty_zero_page, 0, PAGE_SIZE);
  98
  99        /*
 100         * Set up SFC/DFC registers (user data space).
 101         */
 102        set_fs (USER_DS);
 103
 104        zones_size[ZONE_DMA] = (end_mem - PAGE_OFFSET) >> PAGE_SHIFT;
 105        free_area_init(zones_size);
 106}
 107
 108#endif /* CONFIG_MMU */
 109
 110void free_initmem(void)
 111{
 112#ifndef CONFIG_MMU_SUN3
 113        free_initmem_default(-1);
 114#endif /* CONFIG_MMU_SUN3 */
 115}
 116
 117#if defined(CONFIG_MMU) && !defined(CONFIG_COLDFIRE)
 118#define VECTORS &vectors[0]
 119#else
 120#define VECTORS _ramvec
 121#endif
 122
 123void __init print_memmap(void)
 124{
 125#define UL(x) ((unsigned long) (x))
 126#define MLK(b, t) UL(b), UL(t), (UL(t) - UL(b)) >> 10
 127#define MLM(b, t) UL(b), UL(t), (UL(t) - UL(b)) >> 20
 128#define MLK_ROUNDUP(b, t) b, t, DIV_ROUND_UP(((t) - (b)), 1024)
 129
 130        pr_notice("Virtual kernel memory layout:\n"
 131                "    vector  : 0x%08lx - 0x%08lx   (%4ld KiB)\n"
 132                "    kmap    : 0x%08lx - 0x%08lx   (%4ld MiB)\n"
 133                "    vmalloc : 0x%08lx - 0x%08lx   (%4ld MiB)\n"
 134                "    lowmem  : 0x%08lx - 0x%08lx   (%4ld MiB)\n"
 135                "      .init : 0x%p" " - 0x%p" "   (%4d KiB)\n"
 136                "      .text : 0x%p" " - 0x%p" "   (%4d KiB)\n"
 137                "      .data : 0x%p" " - 0x%p" "   (%4d KiB)\n"
 138                "      .bss  : 0x%p" " - 0x%p" "   (%4d KiB)\n",
 139                MLK(VECTORS, VECTORS + 256),
 140                MLM(KMAP_START, KMAP_END),
 141                MLM(VMALLOC_START, VMALLOC_END),
 142                MLM(PAGE_OFFSET, (unsigned long)high_memory),
 143                MLK_ROUNDUP(__init_begin, __init_end),
 144                MLK_ROUNDUP(_stext, _etext),
 145                MLK_ROUNDUP(_sdata, _edata),
 146                MLK_ROUNDUP(__bss_start, __bss_stop));
 147}
 148
 149static inline void init_pointer_tables(void)
 150{
 151#if defined(CONFIG_MMU) && !defined(CONFIG_SUN3) && !defined(CONFIG_COLDFIRE)
 152        int i;
 153
 154        /* insert pointer tables allocated so far into the tablelist */
 155        init_pointer_table((unsigned long)kernel_pg_dir);
 156        for (i = 0; i < PTRS_PER_PGD; i++) {
 157                if (pgd_present(kernel_pg_dir[i]))
 158                        init_pointer_table(__pgd_page(kernel_pg_dir[i]));
 159        }
 160
 161        /* insert also pointer table that we used to unmap the zero page */
 162        if (zero_pgtable)
 163                init_pointer_table((unsigned long)zero_pgtable);
 164#endif
 165}
 166
 167void __init mem_init(void)
 168{
 169        /* this will put all memory onto the freelists */
 170        free_all_bootmem();
 171        init_pointer_tables();
 172        mem_init_print_info(NULL);
 173        print_memmap();
 174}
 175
 176#ifdef CONFIG_BLK_DEV_INITRD
 177void free_initrd_mem(unsigned long start, unsigned long end)
 178{
 179        free_reserved_area((void *)start, (void *)end, -1, "initrd");
 180}
 181#endif
 182