arch/score/mm/init.c

   1 /*
   2  * arch/score/mm/init.c
   3  *
   4  * Score Processor version.
   5  *
   6  * Copyright (C) 2009 Sunplus Core Technology Co., Ltd.
   7  *  Lennox Wu <lennox.wu@sunplusct.com>
   8  *  Chen Liqin <liqin.chen@sunplusct.com>
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License as published by
  12  * the Free Software Foundation; either version 2 of the License, or
  13  * (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  * GNU General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public License
  21  * along with this program; if not, see the file COPYING, or write
  22  * to the Free Software Foundation, Inc.,
  23  * 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  24  */
  25
  26 #include <linux/errno.h>
  27 #include <linux/bootmem.h>
  28 #include <linux/kernel.h>
  29 #include <linux/gfp.h>
  30 #include <linux/init.h>
  31 #include <linux/mm.h>
  32 #include <linux/mman.h>
  33 #include <linux/pagemap.h>
  34 #include <linux/kcore.h>
  35 #include <linux/sched.h>
  36 #include <linux/initrd.h>
  37
  38 #include <asm/sections.h>
  39 #include <asm/tlb.h>
  40
  41 unsigned long empty_zero_page;
  42 EXPORT_SYMBOL_GPL(empty_zero_page);
  43
  44 static void setup_zero_page(void)
  45 {
  46         struct page *page;
  47
  48         empty_zero_page = __get_free_pages(GFP_KERNEL | __GFP_ZERO, 0);
  49         if (!empty_zero_page)
  50                 panic("Oh boy, that early out of memory?");
  51
  52         page = virt_to_page((void *) empty_zero_page);
  53         mark_page_reserved(page);
  54 }
  55
  56 #ifndef CONFIG_NEED_MULTIPLE_NODES
  57 int page_is_ram(unsigned long pagenr)
  58 {
  59         if (pagenr >= min_low_pfn && pagenr < max_low_pfn)
  60                 return 1;
  61         else
  62                 return 0;
  63 }
  64
  65 void __init paging_init(void)
  66 {
  67         unsigned long max_zone_pfns[MAX_NR_ZONES];
  68         unsigned long lastpfn;
  69
  70         pagetable_init();
  71         max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
  72         lastpfn = max_low_pfn;
  73         free_area_init_nodes(max_zone_pfns);
  74 }
  75
  76 void __init mem_init(void)
  77 {
  78         high_memory = (void *) __va(max_low_pfn << PAGE_SHIFT);
  79         free_all_bootmem();
  80         setup_zero_page();      /* Setup zeroed pages. */
  81
  82         mem_init_print_info(NULL);
  83 }
  84 #endif /* !CONFIG_NEED_MULTIPLE_NODES */
  85
  86 #ifdef CONFIG_BLK_DEV_INITRD
  87 void free_initrd_mem(unsigned long start, unsigned long end)
  88 {
  89         free_reserved_area((void *)start, (void *)end, POISON_FREE_INITMEM,
  90                            "initrd");
  91 }
  92 #endif
  93
  94 void __ref free_initmem(void)
  95 {
  96         free_initmem_default(POISON_FREE_INITMEM);
  97 }
  98
  99 unsigned long pgd_current;
 100
 101 #define __page_aligned(order) __attribute__((__aligned__(PAGE_SIZE<<order)))
 102
 103 /*
 104  * gcc 3.3 and older have trouble determining that PTRS_PER_PGD and PGD_ORDER
 105  * are constants.  So we use the variants from asm-offset.h until that gcc
 106  * will officially be retired.
 107  */
 108 pgd_t swapper_pg_dir[PTRS_PER_PGD] __page_aligned(PTE_ORDER);
 109 pte_t invalid_pte_table[PTRS_PER_PTE] __page_aligned(PTE_ORDER);