arch/riscv/mm/init.c

   1 /*
   2  * Copyright (C) 2012 Regents of the University of California
   3  *
   4  *   This program is free software; you can redistribute it and/or
   5  *   modify it under the terms of the GNU General Public License
   6  *   as published by the Free Software Foundation, version 2.
   7  *
   8  *   This program is distributed in the hope that it will be useful,
   9  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11  *   GNU General Public License for more details.
  12  */
  13
  14 #include <linux/init.h>
  15 #include <linux/mm.h>
  16 #include <linux/bootmem.h>
  17 #include <linux/initrd.h>
  18 #include <linux/memblock.h>
  19 #include <linux/swap.h>
  20 #include <linux/sizes.h>
  21
  22 #include <asm/tlbflush.h>
  23 #include <asm/sections.h>
  24 #include <asm/pgtable.h>
  25 #include <asm/io.h>
  26
  27 static void __init zone_sizes_init(void)
  28 {
  29         unsigned long max_zone_pfns[MAX_NR_ZONES] = { 0, };
  30
  31 #ifdef CONFIG_ZONE_DMA32
  32         max_zone_pfns[ZONE_DMA32] = PFN_DOWN(min(4UL * SZ_1G,
  33                         (unsigned long) PFN_PHYS(max_low_pfn)));
  34 #endif
  35         max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
  36
  37         free_area_init_nodes(max_zone_pfns);
  38 }
  39
  40 void setup_zero_page(void)
  41 {
  42         memset((void *)empty_zero_page, 0, PAGE_SIZE);
  43 }
  44
  45 void __init paging_init(void)
  46 {
  47         setup_zero_page();
  48         local_flush_tlb_all();
  49         zone_sizes_init();
  50 }
  51
  52 void __init mem_init(void)
  53 {
  54 #ifdef CONFIG_FLATMEM
  55         BUG_ON(!mem_map);
  56 #endif /* CONFIG_FLATMEM */
  57
  58         high_memory = (void *)(__va(PFN_PHYS(max_low_pfn)));
  59         free_all_bootmem();
  60
  61         mem_init_print_info(NULL);
  62 }
  63
  64 void free_initmem(void)
  65 {
  66         free_initmem_default(0);
  67 }
  68
  69 #ifdef CONFIG_BLK_DEV_INITRD
  70 void free_initrd_mem(unsigned long start, unsigned long end)
  71 {
  72 }
  73 #endif /* CONFIG_BLK_DEV_INITRD */