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/arch/score/mm/init.c

https://bitbucket.org/thekraven/iscream_thunderc-2.6.35
C | 157 lines | 103 code | 25 blank | 29 comment | 7 complexity | 967379c9529f8b2c4abe3b054ac93a10 MD5 | raw file
Possible License(s): GPL-2.0, LGPL-2.0, AGPL-1.0
  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);