LXR linux/arch/h8300/mm/init.c

   1// SPDX-License-Identifier: GPL-2.0
   2/*
   3 *  linux/arch/h8300/mm/init.c
   4 *
   5 *  Copyright (C) 1998  D. Jeff Dionne <jeff@lineo.ca>,
   6 *                      Kenneth Albanowski <kjahds@kjahds.com>,
   7 *  Copyright (C) 2000  Lineo, Inc.  (www.lineo.com)
   8 *
   9 *  Based on:
  10 *
  11 *  linux/arch/m68knommu/mm/init.c
  12 *  linux/arch/m68k/mm/init.c
  13 *
  14 *  Copyright (C) 1995  Hamish Macdonald
  15 *
  16 *  JAN/1999 -- hacked to support ColdFire (gerg@snapgear.com)
  17 *  DEC/2000 -- linux 2.4 support <davidm@snapgear.com>
  18 */
  19
  20#include <linux/signal.h>
  21#include <linux/sched.h>
  22#include <linux/kernel.h>
  23#include <linux/errno.h>
  24#include <linux/string.h>
  25#include <linux/types.h>
  26#include <linux/ptrace.h>
  27#include <linux/mman.h>
  28#include <linux/mm.h>
  29#include <linux/swap.h>
  30#include <linux/init.h>
  31#include <linux/highmem.h>
  32#include <linux/pagemap.h>
  33#include <linux/memblock.h>
  34#include <linux/gfp.h>
  35
  36#include <asm/setup.h>
  37#include <asm/segment.h>
  38#include <asm/page.h>
  39#include <asm/sections.h>
  40
  41/*
  42 * ZERO_PAGE is a special page that is used for zero-initialized
  43 * data and COW.
  44 */
  45unsigned long empty_zero_page;
  46
  47/*
  48 * paging_init() continues the virtual memory environment setup which
  49 * was begun by the code in arch/head.S.
  50 * The parameters are pointers to where to stick the starting and ending
  51 * addresses of available kernel virtual memory.
  52 */
  53void __init paging_init(void)
  54{
  55        /*
  56         * Make sure start_mem is page aligned,  otherwise bootmem and
  57         * page_alloc get different views og the world.
  58         */
  59        unsigned long start_mem = PAGE_ALIGN(memory_start);
  60        unsigned long end_mem   = memory_end & PAGE_MASK;
  61
  62        pr_debug("start_mem is %#lx\nvirtual_end is %#lx\n",
  63                 start_mem, end_mem);
  64
  65        /*
  66         * Initialize the bad page table and bad page to point
  67         * to a couple of allocated pages.
  68         */
  69        empty_zero_page = (unsigned long)memblock_alloc(PAGE_SIZE, PAGE_SIZE);
  70        if (!empty_zero_page)
  71                panic("%s: Failed to allocate %lu bytes align=0x%lx\n",
  72                      __func__, PAGE_SIZE, PAGE_SIZE);
  73
  74        /*
  75         * Set up SFC/DFC registers (user data space).
  76         */
  77        set_fs(USER_DS);
  78
  79        pr_debug("before free_area_init\n");
  80
  81        pr_debug("free_area_init -> start_mem is %#lx\nvirtual_end is %#lx\n",
  82                 start_mem, end_mem);
  83
  84        {
  85                unsigned long max_zone_pfn[MAX_NR_ZONES] = {0, };
  86
  87                max_zone_pfn[ZONE_NORMAL] = end_mem >> PAGE_SHIFT;
  88                free_area_init(max_zone_pfn);
  89        }
  90}
  91
  92void __init mem_init(void)
  93{
  94        pr_devel("Mem_init: start=%lx, end=%lx\n", memory_start, memory_end);
  95
  96        high_memory = (void *) (memory_end & PAGE_MASK);
  97        max_mapnr = MAP_NR(high_memory);
  98
  99        /* this will put all low memory onto the freelists */
 100        memblock_free_all();
 101}
 102