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/bootmem.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/pgtable.h>
  40#include <asm/sections.h>
  41
  42/*
  43 * ZERO_PAGE is a special page that is used for zero-initialized
  44 * data and COW.
  45 */
  46unsigned long empty_zero_page;
  47
  48/*
  49 * paging_init() continues the virtual memory environment setup which
  50 * was begun by the code in arch/head.S.
  51 * The parameters are pointers to where to stick the starting and ending
  52 * addresses of available kernel virtual memory.
  53 */
  54void __init paging_init(void)
  55{
  56        /*
  57         * Make sure start_mem is page aligned,  otherwise bootmem and
  58         * page_alloc get different views og the world.
  59         */
  60        unsigned long start_mem = PAGE_ALIGN(memory_start);
  61        unsigned long end_mem   = memory_end & PAGE_MASK;
  62
  63        pr_debug("start_mem is %#lx\nvirtual_end is %#lx\n",
  64                 start_mem, end_mem);
  65
  66        /*
  67         * Initialize the bad page table and bad page to point
  68         * to a couple of allocated pages.
  69         */
  70        empty_zero_page = (unsigned long)alloc_bootmem_pages(PAGE_SIZE);
  71        memset((void *)empty_zero_page, 0, PAGE_SIZE);
  72
  73        /*
  74         * Set up SFC/DFC registers (user data space).
  75         */
  76        set_fs(USER_DS);
  77
  78        pr_debug("before free_area_init\n");
  79
  80        pr_debug("free_area_init -> start_mem is %#lx\nvirtual_end is %#lx\n",
  81                 start_mem, end_mem);
  82
  83        {
  84                unsigned long zones_size[MAX_NR_ZONES] = {0, };
  85
  86                zones_size[ZONE_NORMAL] = (end_mem - PAGE_OFFSET) >> PAGE_SHIFT;
  87                free_area_init(zones_size);
  88        }
  89}
  90
  91void __init mem_init(void)
  92{
  93        pr_devel("Mem_init: start=%lx, end=%lx\n", memory_start, memory_end);
  94
  95        high_memory = (void *) (memory_end & PAGE_MASK);
  96        max_mapnr = MAP_NR(high_memory);
  97
  98        /* this will put all low memory onto the freelists */
  99        free_all_bootmem();
 100
 101        mem_init_print_info(NULL);
 102}
 103
 104
 105#ifdef CONFIG_BLK_DEV_INITRD
 106void free_initrd_mem(unsigned long start, unsigned long end)
 107{
 108        free_reserved_area((void *)start, (void *)end, -1, "initrd");
 109}
 110#endif
 111
 112void
 113free_initmem(void)
 114{
 115        free_initmem_default(-1);
 116}
 117