init.c revision 2f96b8c1d5d492c1d0457b253015330f844136f6
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 41unsigned long empty_zero_page; 42EXPORT_SYMBOL_GPL(empty_zero_page); 43 44static struct kcore_list kcore_mem, kcore_vmalloc; 45 46static unsigned long setup_zero_page(void) 47{ 48 struct page *page; 49 50 empty_zero_page = __get_free_pages(GFP_KERNEL | __GFP_ZERO, 0); 51 if (!empty_zero_page) 52 panic("Oh boy, that early out of memory?"); 53 54 page = virt_to_page((void *) empty_zero_page); 55 SetPageReserved(page); 56 57 return 1UL; 58} 59 60#ifndef CONFIG_NEED_MULTIPLE_NODES 61int page_is_ram(unsigned long pagenr) 62{ 63 if (pagenr >= min_low_pfn && pagenr < max_low_pfn) 64 return 1; 65 else 66 return 0; 67} 68 69void __init paging_init(void) 70{ 71 unsigned long max_zone_pfns[MAX_NR_ZONES]; 72 unsigned long lastpfn; 73 74 pagetable_init(); 75 max_zone_pfns[ZONE_NORMAL] = max_low_pfn; 76 lastpfn = max_low_pfn; 77 free_area_init_nodes(max_zone_pfns); 78} 79 80void __init mem_init(void) 81{ 82 unsigned long codesize, reservedpages, datasize, initsize; 83 unsigned long tmp, ram = 0; 84 85 high_memory = (void *) __va(max_low_pfn << PAGE_SHIFT); 86 totalram_pages += free_all_bootmem(); 87 totalram_pages -= setup_zero_page(); /* Setup zeroed pages. */ 88 reservedpages = 0; 89 90 for (tmp = 0; tmp < max_low_pfn; tmp++) 91 if (page_is_ram(tmp)) { 92 ram++; 93 if (PageReserved(pfn_to_page(tmp))) 94 reservedpages++; 95 } 96 97 num_physpages = ram; 98 codesize = (unsigned long) &_etext - (unsigned long) &_text; 99 datasize = (unsigned long) &_edata - (unsigned long) &_etext; 100 initsize = (unsigned long) &__init_end - (unsigned long) &__init_begin; 101 102 printk(KERN_INFO "Memory: %luk/%luk available (%ldk kernel code, " 103 "%ldk reserved, %ldk data, %ldk init, %ldk highmem)\n", 104 (unsigned long) nr_free_pages() << (PAGE_SHIFT-10), 105 ram << (PAGE_SHIFT-10), codesize >> 10, 106 reservedpages << (PAGE_SHIFT-10), datasize >> 10, 107 initsize >> 10, 108 totalhigh_pages << (PAGE_SHIFT-10)); 109} 110#endif /* !CONFIG_NEED_MULTIPLE_NODES */ 111 112static void free_init_pages(const char *what, unsigned long begin, unsigned long end) 113{ 114 unsigned long pfn; 115 116 for (pfn = PFN_UP(begin); pfn < PFN_DOWN(end); pfn++) { 117 struct page *page = pfn_to_page(pfn); 118 void *addr = phys_to_virt(PFN_PHYS(pfn)); 119 120 ClearPageReserved(page); 121 init_page_count(page); 122 memset(addr, POISON_FREE_INITMEM, PAGE_SIZE); 123 __free_page(page); 124 totalram_pages++; 125 } 126 printk(KERN_INFO "Freeing %s: %ldk freed\n", what, (end - begin) >> 10); 127} 128 129#ifdef CONFIG_BLK_DEV_INITRD 130void free_initrd_mem(unsigned long start, unsigned long end) 131{ 132 free_init_pages("initrd memory", 133 virt_to_phys((void *) start), 134 virt_to_phys((void *) end)); 135} 136#endif 137 138void __init_refok free_initmem(void) 139{ 140 free_init_pages("unused kernel memory", 141 __pa(&__init_begin), 142 __pa(&__init_end)); 143} 144 145unsigned long pgd_current; 146 147#define __page_aligned(order) __attribute__((__aligned__(PAGE_SIZE<<order))) 148 149/* 150 * gcc 3.3 and older have trouble determining that PTRS_PER_PGD and PGD_ORDER 151 * are constants. So we use the variants from asm-offset.h until that gcc 152 * will officially be retired. 153 */ 154pgd_t swapper_pg_dir[PTRS_PER_PGD] __page_aligned(PTE_ORDER); 155pte_t invalid_pte_table[PTRS_PER_PTE] __page_aligned(PTE_ORDER); 156