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#ifdef CONFIG_MMU
  44
  45pg_data_t pg_data_map[MAX_NUMNODES];
  46EXPORT_SYMBOL(pg_data_map);
  47
  48int m68k_virt_to_node_shift;
  49
  50#ifndef CONFIG_SINGLE_MEMORY_CHUNK
  51pg_data_t *pg_data_table[65];
  52EXPORT_SYMBOL(pg_data_table);
  53#endif
  54
  55void __init m68k_setup_node(int node)
  56{
  57#ifndef CONFIG_SINGLE_MEMORY_CHUNK
  58        struct m68k_mem_info *info = m68k_memory + node;
  59        int i, end;
  60
  61        i = (unsigned long)phys_to_virt(info->addr) >> __virt_to_node_shift();
  62        end = (unsigned long)phys_to_virt(info->addr + info->size - 1) >> __virt_to_node_shift();
  63        for (; i <= end; i++) {
  64                if (pg_data_table[i])
  65                        pr_warn("overlap at %u for chunk %u\n", i, node);
  66                pg_data_table[i] = pg_data_map + node;
  67        }
  68#endif
  69        node_set_online(node);
  70}
  71
  72#else /* CONFIG_MMU */
  73
  74/*
  75 * paging_init() continues the virtual memory environment setup which
  76 * was begun by the code in arch/head.S.
  77 * The parameters are pointers to where to stick the starting and ending
  78 * addresses of available kernel virtual memory.
  79 */
  80void __init paging_init(void)
  81{
  82        /*
  83         * Make sure start_mem is page aligned, otherwise bootmem and
  84         * page_alloc get different views of the world.
  85         */
  86        unsigned long end_mem = memory_end & PAGE_MASK;
  87        unsigned long zones_size[MAX_NR_ZONES] = { 0, };
  88
  89        high_memory = (void *) end_mem;
  90
  91        empty_zero_page = memblock_alloc(PAGE_SIZE, PAGE_SIZE);
  92        if (!empty_zero_page)
  93                panic("%s: Failed to allocate %lu bytes align=0x%lx\n",
  94                      __func__, PAGE_SIZE, PAGE_SIZE);
  95
  96        /*
  97         * Set up SFC/DFC registers (user data space).
  98         */
  99        set_fs (USER_DS);
 100
 101        zones_size[ZONE_DMA] = (end_mem - PAGE_OFFSET) >> PAGE_SHIFT;
 102        free_area_init(zones_size);
 103}
 104
 105#endif /* CONFIG_MMU */
 106
 107void free_initmem(void)
 108{
 109#ifndef CONFIG_MMU_SUN3
 110        free_initmem_default(-1);
 111#endif /* CONFIG_MMU_SUN3 */
 112}
 113
 114#if defined(CONFIG_MMU) && !defined(CONFIG_COLDFIRE)
 115#define VECTORS &vectors[0]
 116#else
 117#define VECTORS _ramvec
 118#endif
 119
 120static inline void init_pointer_tables(void)
 121{
 122#if defined(CONFIG_MMU) && !defined(CONFIG_SUN3) && !defined(CONFIG_COLDFIRE)
 123        int i, j;
 124
 125        /* insert pointer tables allocated so far into the tablelist */
 126        init_pointer_table(kernel_pg_dir, TABLE_PGD);
 127        for (i = 0; i < PTRS_PER_PGD; i++) {
 128                pud_t *pud = (pud_t *)&kernel_pg_dir[i];
 129                pmd_t *pmd_dir;
 130
 131                if (!pud_present(*pud))
 132                        continue;
 133
 134                pmd_dir = (pmd_t *)pgd_page_vaddr(kernel_pg_dir[i]);
 135                init_pointer_table(pmd_dir, TABLE_PMD);
 136
 137                for (j = 0; j < PTRS_PER_PMD; j++) {
 138                        pmd_t *pmd = &pmd_dir[j];
 139                        pte_t *pte_dir;
 140
 141                        if (!pmd_present(*pmd))
 142                                continue;
 143
 144                        pte_dir = (pte_t *)__pmd_page(*pmd);
 145                        init_pointer_table(pte_dir, TABLE_PTE);
 146                }
 147        }
 148#endif
 149}
 150
 151void __init mem_init(void)
 152{
 153        /* this will put all memory onto the freelists */
 154        memblock_free_all();
 155        init_pointer_tables();
 156        mem_init_print_info(NULL);
 157}
 158