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