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/proc_fs.h> 35#include <linux/sched.h> 36#include <linux/initrd.h> 37 38#include <asm/sections.h> 39#include <asm/tlb.h> 40 41DEFINE_PER_CPU(struct mmu_gather, mmu_gathers); 42 43unsigned long empty_zero_page; 44EXPORT_SYMBOL_GPL(empty_zero_page); 45 46static struct kcore_list kcore_mem, kcore_vmalloc; 47 48static unsigned long setup_zero_page(void) 49{ 50 struct page *page; 51 52 empty_zero_page = __get_free_pages(GFP_KERNEL | __GFP_ZERO, 0); 53 if (!empty_zero_page) 54 panic("Oh boy, that early out of memory?"); 55 56 page = virt_to_page((void *) empty_zero_page); 57 SetPageReserved(page); 58 59 return 1UL; 60} 61 62#ifndef CONFIG_NEED_MULTIPLE_NODES 63int page_is_ram(unsigned long pagenr) 64{ 65 if (pagenr >= min_low_pfn && pagenr < max_low_pfn) 66 return 1; 67 else 68 return 0; 69} 70 71void __init paging_init(void) 72{ 73 unsigned long max_zone_pfns[MAX_NR_ZONES]; 74 unsigned long lastpfn; 75 76 pagetable_init(); 77 max_zone_pfns[ZONE_NORMAL] = max_low_pfn; 78 lastpfn = max_low_pfn; 79 free_area_init_nodes(max_zone_pfns); 80} 81 82void __init mem_init(void) 83{ 84 unsigned long codesize, reservedpages, datasize, initsize; 85 unsigned long tmp, ram = 0; 86 87 high_memory = (void *) __va(max_low_pfn << PAGE_SHIFT); 88 totalram_pages += free_all_bootmem(); 89 totalram_pages -= setup_zero_page(); /* Setup zeroed pages. */ 90 reservedpages = 0; 91 92 for (tmp = 0; tmp < max_low_pfn; tmp++) 93 if (page_is_ram(tmp)) { 94 ram++; 95 if (PageReserved(pfn_to_page(tmp))) 96 reservedpages++; 97 } 98 99 num_physpages = ram; 100 codesize = (unsigned long) &_etext - (unsigned long) &_text; 101 datasize = (unsigned long) &_edata - (unsigned long) &_etext; 102 initsize = (unsigned long) &__init_end - (unsigned long) &__init_begin; 103 104 printk(KERN_INFO "Memory: %luk/%luk available (%ldk kernel code, " 105 "%ldk reserved, %ldk data, %ldk init, %ldk highmem)\n", 106 (unsigned long) nr_free_pages() << (PAGE_SHIFT-10), 107 ram << (PAGE_SHIFT-10), codesize >> 10, 108 reservedpages << (PAGE_SHIFT-10), datasize >> 10, 109 initsize >> 10, 110 totalhigh_pages << (PAGE_SHIFT-10)); 111} 112#endif /* !CONFIG_NEED_MULTIPLE_NODES */ 113 114static void free_init_pages(const char *what, unsigned long begin, unsigned long end) 115{ 116 unsigned long pfn; 117 118 for (pfn = PFN_UP(begin); pfn < PFN_DOWN(end); pfn++) { 119 struct page *page = pfn_to_page(pfn); 120 void *addr = phys_to_virt(PFN_PHYS(pfn)); 121 122 ClearPageReserved(page); 123 init_page_count(page); 124 memset(addr, POISON_FREE_INITMEM, PAGE_SIZE); 125 __free_page(page); 126 totalram_pages++; 127 } 128 printk(KERN_INFO "Freeing %s: %ldk freed\n", what, (end - begin) >> 10); 129} 130 131#ifdef CONFIG_BLK_DEV_INITRD 132void free_initrd_mem(unsigned long start, unsigned long end) 133{ 134 free_init_pages("initrd memory", 135 virt_to_phys((void *) start), 136 virt_to_phys((void *) end)); 137} 138#endif 139 140void __init_refok free_initmem(void) 141{ 142 free_init_pages("unused kernel memory", 143 __pa(&__init_begin), 144 __pa(&__init_end)); 145} 146 147unsigned long pgd_current; 148 149#define __page_aligned(order) __attribute__((__aligned__(PAGE_SIZE<<order))) 150 151/* 152 * gcc 3.3 and older have trouble determining that PTRS_PER_PGD and PGD_ORDER 153 * are constants. So we use the variants from asm-offset.h until that gcc 154 * will officially be retired. 155 */ 156pgd_t swapper_pg_dir[PTRS_PER_PGD] __page_aligned(PTE_ORDER); 157pte_t invalid_pte_table[PTRS_PER_PTE] __page_aligned(PTE_ORDER); 158