| /* |
| * arch/score/mm/init.c |
| * |
| * Score Processor version. |
| * |
| * Copyright (C) 2009 Sunplus Core Technology Co., Ltd. |
| * Lennox Wu <lennox.wu@sunplusct.com> |
| * Chen Liqin <liqin.chen@sunplusct.com> |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation; either version 2 of the License, or |
| * (at your option) any later version. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, see the file COPYING, or write |
| * to the Free Software Foundation, Inc., |
| * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
| */ |
| |
| #include <linux/errno.h> |
| #include <linux/bootmem.h> |
| #include <linux/kernel.h> |
| #include <linux/gfp.h> |
| #include <linux/init.h> |
| #include <linux/mm.h> |
| #include <linux/mman.h> |
| #include <linux/pagemap.h> |
| #include <linux/kcore.h> |
| #include <linux/sched.h> |
| #include <linux/initrd.h> |
| |
| #include <asm/sections.h> |
| #include <asm/tlb.h> |
| |
| unsigned long empty_zero_page; |
| EXPORT_SYMBOL_GPL(empty_zero_page); |
| |
| static void setup_zero_page(void) |
| { |
| struct page *page; |
| |
| empty_zero_page = __get_free_pages(GFP_KERNEL | __GFP_ZERO, 0); |
| if (!empty_zero_page) |
| panic("Oh boy, that early out of memory?"); |
| |
| page = virt_to_page((void *) empty_zero_page); |
| mark_page_reserved(page); |
| } |
| |
| #ifndef CONFIG_NEED_MULTIPLE_NODES |
| int page_is_ram(unsigned long pagenr) |
| { |
| if (pagenr >= min_low_pfn && pagenr < max_low_pfn) |
| return 1; |
| else |
| return 0; |
| } |
| |
| void __init paging_init(void) |
| { |
| unsigned long max_zone_pfns[MAX_NR_ZONES]; |
| unsigned long lastpfn; |
| |
| pagetable_init(); |
| max_zone_pfns[ZONE_NORMAL] = max_low_pfn; |
| lastpfn = max_low_pfn; |
| free_area_init_nodes(max_zone_pfns); |
| } |
| |
| void __init mem_init(void) |
| { |
| unsigned long codesize, reservedpages, datasize, initsize; |
| unsigned long tmp, ram = 0; |
| |
| high_memory = (void *) __va(max_low_pfn << PAGE_SHIFT); |
| totalram_pages += free_all_bootmem(); |
| setup_zero_page(); /* Setup zeroed pages. */ |
| reservedpages = 0; |
| |
| for (tmp = 0; tmp < max_low_pfn; tmp++) |
| if (page_is_ram(tmp)) { |
| ram++; |
| if (PageReserved(pfn_to_page(tmp))) |
| reservedpages++; |
| } |
| |
| num_physpages = ram; |
| codesize = (unsigned long) &_etext - (unsigned long) &_text; |
| datasize = (unsigned long) &_edata - (unsigned long) &_etext; |
| initsize = (unsigned long) &__init_end - (unsigned long) &__init_begin; |
| |
| printk(KERN_INFO "Memory: %luk/%luk available (%ldk kernel code, " |
| "%ldk reserved, %ldk data, %ldk init, %ldk highmem)\n", |
| (unsigned long) nr_free_pages() << (PAGE_SHIFT-10), |
| ram << (PAGE_SHIFT-10), codesize >> 10, |
| reservedpages << (PAGE_SHIFT-10), datasize >> 10, |
| initsize >> 10, |
| totalhigh_pages << (PAGE_SHIFT-10)); |
| } |
| #endif /* !CONFIG_NEED_MULTIPLE_NODES */ |
| |
| #ifdef CONFIG_BLK_DEV_INITRD |
| void free_initrd_mem(unsigned long start, unsigned long end) |
| { |
| free_reserved_area((void *)start, (void *)end, POISON_FREE_INITMEM, |
| "initrd"); |
| } |
| #endif |
| |
| void __init_refok free_initmem(void) |
| { |
| free_initmem_default(POISON_FREE_INITMEM); |
| } |
| |
| unsigned long pgd_current; |
| |
| #define __page_aligned(order) __attribute__((__aligned__(PAGE_SIZE<<order))) |
| |
| /* |
| * gcc 3.3 and older have trouble determining that PTRS_PER_PGD and PGD_ORDER |
| * are constants. So we use the variants from asm-offset.h until that gcc |
| * will officially be retired. |
| */ |
| pgd_t swapper_pg_dir[PTRS_PER_PGD] __page_aligned(PTE_ORDER); |
| pte_t invalid_pte_table[PTRS_PER_PTE] __page_aligned(PTE_ORDER); |