linux/arch/m68k/mm/init.c
<<
>>
Prefs
   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
  45int m68k_virt_to_node_shift;
  46
  47void __init m68k_setup_node(int node)
  48{
  49        node_set_online(node);
  50}
  51
  52#else /* CONFIG_MMU */
  53
  54/*
  55 * paging_init() continues the virtual memory environment setup which
  56 * was begun by the code in arch/head.S.
  57 * The parameters are pointers to where to stick the starting and ending
  58 * addresses of available kernel virtual memory.
  59 */
  60void __init paging_init(void)
  61{
  62        /*
  63         * Make sure start_mem is page aligned, otherwise bootmem and
  64         * page_alloc get different views of the world.
  65         */
  66        unsigned long end_mem = memory_end & PAGE_MASK;
  67        unsigned long max_zone_pfn[MAX_NR_ZONES] = { 0, };
  68
  69        high_memory = (void *) end_mem;
  70
  71        empty_zero_page = memblock_alloc(PAGE_SIZE, PAGE_SIZE);
  72        if (!empty_zero_page)
  73                panic("%s: Failed to allocate %lu bytes align=0x%lx\n",
  74                      __func__, PAGE_SIZE, PAGE_SIZE);
  75
  76        /*
  77         * Set up SFC/DFC registers (user data space).
  78         */
  79        set_fs (USER_DS);
  80
  81        max_zone_pfn[ZONE_DMA] = end_mem >> PAGE_SHIFT;
  82        free_area_init(max_zone_pfn);
  83}
  84
  85#endif /* CONFIG_MMU */
  86
  87void free_initmem(void)
  88{
  89#ifndef CONFIG_MMU_SUN3
  90        free_initmem_default(-1);
  91#endif /* CONFIG_MMU_SUN3 */
  92}
  93
  94#if defined(CONFIG_MMU) && !defined(CONFIG_COLDFIRE)
  95#define VECTORS &vectors[0]
  96#else
  97#define VECTORS _ramvec
  98#endif
  99
 100static inline void init_pointer_tables(void)
 101{
 102#if defined(CONFIG_MMU) && !defined(CONFIG_SUN3) && !defined(CONFIG_COLDFIRE)
 103        int i, j;
 104
 105        /* insert pointer tables allocated so far into the tablelist */
 106        init_pointer_table(kernel_pg_dir, TABLE_PGD);
 107        for (i = 0; i < PTRS_PER_PGD; i++) {
 108                pud_t *pud = (pud_t *)&kernel_pg_dir[i];
 109                pmd_t *pmd_dir;
 110
 111                if (!pud_present(*pud))
 112                        continue;
 113
 114                pmd_dir = (pmd_t *)pgd_page_vaddr(kernel_pg_dir[i]);
 115                init_pointer_table(pmd_dir, TABLE_PMD);
 116
 117                for (j = 0; j < PTRS_PER_PMD; j++) {
 118                        pmd_t *pmd = &pmd_dir[j];
 119                        pte_t *pte_dir;
 120
 121                        if (!pmd_present(*pmd))
 122                                continue;
 123
 124                        pte_dir = (pte_t *)pmd_page_vaddr(*pmd);
 125                        init_pointer_table(pte_dir, TABLE_PTE);
 126                }
 127        }
 128#endif
 129}
 130
 131void __init mem_init(void)
 132{
 133        /* this will put all memory onto the freelists */
 134        memblock_free_all();
 135        init_pointer_tables();
 136}
 137