mirror of https://gitee.com/openkylin/linux.git
110 lines
2.8 KiB
C
110 lines
2.8 KiB
C
/*
|
|
* 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)
|
|
{
|
|
high_memory = (void *) __va(max_low_pfn << PAGE_SHIFT);
|
|
free_all_bootmem();
|
|
setup_zero_page(); /* Setup zeroed pages. */
|
|
|
|
mem_init_print_info(NULL);
|
|
}
|
|
#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 __ref 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);
|