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/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  */
  46 unsigned 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  */
  54 void __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)memblock_alloc(PAGE_SIZE, PAGE_SIZE);
  71         if (!empty_zero_page)
  72                 panic("%s: Failed to allocate %lu bytes align=0x%lx\n",
  73                       __func__, PAGE_SIZE, PAGE_SIZE);
  74
  75         /*
  76          * Set up SFC/DFC registers (user data space).
  77          */
  78         set_fs(USER_DS);
  79
  80         pr_debug("before free_area_init\n");
  81
  82         pr_debug("free_area_init -> start_mem is %#lx\nvirtual_end is %#lx\n",
  83                  start_mem, end_mem);
  84
  85         {
  86                 unsigned long zones_size[MAX_NR_ZONES] = {0, };
  87
  88                 zones_size[ZONE_NORMAL] = (end_mem - PAGE_OFFSET) >> PAGE_SHIFT;
  89                 free_area_init(zones_size);
  90         }
  91 }
  92
  93 void __init mem_init(void)
  94 {
  95         pr_devel("Mem_init: start=%lx, end=%lx\n", memory_start, memory_end);
  96
  97         high_memory = (void *) (memory_end & PAGE_MASK);
  98         max_mapnr = MAP_NR(high_memory);
  99
 100         /* this will put all low memory onto the freelists */
 101         memblock_free_all();
 102
 103         mem_init_print_info(NULL);
 104 }