LXR linux/arch/m68k/mm/init.c

   1// SPDX-License-Identifier: GPL-2.0
   2/*
   3 *  linux/arch/m68k/mm/init.c
   4 *
   5 *  Copyright (C) 1995  Hamish Macdonald
   6 *
   7 *  Contains common initialization routines, specific init code moved
   8 *  to motorola.c and sun3mmu.c
   9 */
  10
  11#include <linux/module.h>
  12#include <linux/signal.h>
  13#include <linux/sched.h>
  14#include <linux/mm.h>
  15#include <linux/swap.h>
  16#include <linux/kernel.h>
  17#include <linux/string.h>
  18#include <linux/types.h>
  19#include <linux/init.h>
  20#include <linux/memblock.h>
  21#include <linux/gfp.h>
  22
  23#include <asm/setup.h>
  24#include <linux/uaccess.h>
  25#include <asm/page.h>
  26#include <asm/pgalloc.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/*
  37 * ZERO_PAGE is a special page that is used for zero-initialized
  38 * data and COW.
  39 */
  40void *empty_zero_page;
  41EXPORT_SYMBOL(empty_zero_page);
  42
  43#if !defined(CONFIG_SUN3) && !defined(CONFIG_COLDFIRE)
  44extern void init_pointer_table(unsigned long ptable);
  45extern pmd_t *zero_pgtable;
  46#endif
  47
  48#ifdef CONFIG_MMU
  49
  50pg_data_t pg_data_map[MAX_NUMNODES];
  51EXPORT_SYMBOL(pg_data_map);
  52
  53int m68k_virt_to_node_shift;
  54
  55#ifndef CONFIG_SINGLE_MEMORY_CHUNK
  56pg_data_t *pg_data_table[65];
  57EXPORT_SYMBOL(pg_data_table);
  58#endif
  59
  60void __init m68k_setup_node(int node)
  61{
  62#ifndef CONFIG_SINGLE_MEMORY_CHUNK
  63        struct m68k_mem_info *info = m68k_memory + node;
  64        int i, end;
  65
  66        i = (unsigned long)phys_to_virt(info->addr) >> __virt_to_node_shift();
  67        end = (unsigned long)phys_to_virt(info->addr + info->size - 1) >> __virt_to_node_shift();
  68        for (; i <= end; i++) {
  69                if (pg_data_table[i])
  70                        pr_warn("overlap at %u for chunk %u\n", i, node);
  71                pg_data_table[i] = pg_data_map + node;
  72        }
  73#endif
  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 = memblock_alloc(PAGE_SIZE, PAGE_SIZE);
  97        if (!empty_zero_page)
  98                panic("%s: Failed to allocate %lu bytes align=0x%lx\n",
  99                      __func__, PAGE_SIZE, PAGE_SIZE);
 100
 101        /*
 102         * Set up SFC/DFC registers (user data space).
 103         */
 104        set_fs (USER_DS);
 105
 106        zones_size[ZONE_DMA] = (end_mem - PAGE_OFFSET) >> PAGE_SHIFT;
 107        free_area_init(zones_size);
 108}
 109
 110#endif /* CONFIG_MMU */
 111
 112void free_initmem(void)
 113{
 114#ifndef CONFIG_MMU_SUN3
 115        free_initmem_default(-1);
 116#endif /* CONFIG_MMU_SUN3 */
 117}
 118
 119#if defined(CONFIG_MMU) && !defined(CONFIG_COLDFIRE)
 120#define VECTORS &vectors[0]
 121#else
 122#define VECTORS _ramvec
 123#endif
 124
 125static inline void init_pointer_tables(void)
 126{
 127#if defined(CONFIG_MMU) && !defined(CONFIG_SUN3) && !defined(CONFIG_COLDFIRE)
 128        int i;
 129
 130        /* insert pointer tables allocated so far into the tablelist */
 131        init_pointer_table((unsigned long)kernel_pg_dir);
 132        for (i = 0; i < PTRS_PER_PGD; i++) {
 133                pud_t *pud = (pud_t *)(&kernel_pg_dir[i]);
 134
 135                if (pud_present(*pud))
 136                        init_pointer_table(pgd_page_vaddr(kernel_pg_dir[i]));
 137        }
 138
 139        /* insert also pointer table that we used to unmap the zero page */
 140        if (zero_pgtable)
 141                init_pointer_table((unsigned long)zero_pgtable);
 142#endif
 143}
 144
 145void __init mem_init(void)
 146{
 147        /* this will put all memory onto the freelists */
 148        memblock_free_all();
 149        init_pointer_tables();
 150        mem_init_print_info(NULL);
 151}
 152