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/arch/m68k/mm/init.c

https://bitbucket.org/evzijst/gittest
C | 147 lines | 111 code | 20 blank | 16 comment | 18 complexity | 220785495826ebc9f90f4fda3091710c MD5 | raw file
  1/*
  2 *  linux/arch/m68k/mm/init.c
  3 *
  4 *  Copyright (C) 1995  Hamish Macdonald
  5 *
  6 *  Contains common initialization routines, specific init code moved
  7 *  to motorola.c and sun3mmu.c
  8 */
  9
 10#include <linux/config.h>
 11#include <linux/signal.h>
 12#include <linux/sched.h>
 13#include <linux/mm.h>
 14#include <linux/swap.h>
 15#include <linux/kernel.h>
 16#include <linux/string.h>
 17#include <linux/types.h>
 18#include <linux/init.h>
 19#include <linux/bootmem.h>
 20
 21#include <asm/setup.h>
 22#include <asm/uaccess.h>
 23#include <asm/page.h>
 24#include <asm/pgalloc.h>
 25#include <asm/system.h>
 26#include <asm/machdep.h>
 27#include <asm/io.h>
 28#ifdef CONFIG_ATARI
 29#include <asm/atari_stram.h>
 30#endif
 31#include <asm/tlb.h>
 32
 33DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
 34
 35/*
 36 * ZERO_PAGE is a special page that is used for zero-initialized
 37 * data and COW.
 38 */
 39
 40void *empty_zero_page;
 41
 42void show_mem(void)
 43{
 44    unsigned long i;
 45    int free = 0, total = 0, reserved = 0, shared = 0;
 46    int cached = 0;
 47
 48    printk("\nMem-info:\n");
 49    show_free_areas();
 50    printk("Free swap:       %6ldkB\n", nr_swap_pages<<(PAGE_SHIFT-10));
 51    i = max_mapnr;
 52    while (i-- > 0) {
 53	total++;
 54	if (PageReserved(mem_map+i))
 55	    reserved++;
 56	else if (PageSwapCache(mem_map+i))
 57	    cached++;
 58	else if (!page_count(mem_map+i))
 59	    free++;
 60	else
 61	    shared += page_count(mem_map+i) - 1;
 62    }
 63    printk("%d pages of RAM\n",total);
 64    printk("%d free pages\n",free);
 65    printk("%d reserved pages\n",reserved);
 66    printk("%d pages shared\n",shared);
 67    printk("%d pages swap cached\n",cached);
 68}
 69
 70extern void init_pointer_table(unsigned long ptable);
 71
 72/* References to section boundaries */
 73
 74extern char _text, _etext, _edata, __bss_start, _end;
 75extern char __init_begin, __init_end;
 76
 77extern pmd_t *zero_pgtable;
 78
 79void __init mem_init(void)
 80{
 81	int codepages = 0;
 82	int datapages = 0;
 83	int initpages = 0;
 84	unsigned long tmp;
 85#ifndef CONFIG_SUN3
 86	int i;
 87#endif
 88
 89	max_mapnr = num_physpages = (((unsigned long)high_memory - PAGE_OFFSET) >> PAGE_SHIFT);
 90
 91#ifdef CONFIG_ATARI
 92	if (MACH_IS_ATARI)
 93		atari_stram_mem_init_hook();
 94#endif
 95
 96	/* this will put all memory onto the freelists */
 97	totalram_pages = free_all_bootmem();
 98
 99	for (tmp = PAGE_OFFSET ; tmp < (unsigned long)high_memory; tmp += PAGE_SIZE) {
100		if (PageReserved(virt_to_page(tmp))) {
101			if (tmp >= (unsigned long)&_text
102			    && tmp < (unsigned long)&_etext)
103				codepages++;
104			else if (tmp >= (unsigned long) &__init_begin
105				 && tmp < (unsigned long) &__init_end)
106				initpages++;
107			else
108				datapages++;
109			continue;
110		}
111	}
112
113#ifndef CONFIG_SUN3
114	/* insert pointer tables allocated so far into the tablelist */
115	init_pointer_table((unsigned long)kernel_pg_dir);
116	for (i = 0; i < PTRS_PER_PGD; i++) {
117		if (pgd_present(kernel_pg_dir[i]))
118			init_pointer_table(__pgd_page(kernel_pg_dir[i]));
119	}
120
121	/* insert also pointer table that we used to unmap the zero page */
122	if (zero_pgtable)
123		init_pointer_table((unsigned long)zero_pgtable);
124#endif
125
126	printk("Memory: %luk/%luk available (%dk kernel code, %dk data, %dk init)\n",
127	       (unsigned long)nr_free_pages() << (PAGE_SHIFT-10),
128	       max_mapnr << (PAGE_SHIFT-10),
129	       codepages << (PAGE_SHIFT-10),
130	       datapages << (PAGE_SHIFT-10),
131	       initpages << (PAGE_SHIFT-10));
132}
133
134#ifdef CONFIG_BLK_DEV_INITRD
135void free_initrd_mem(unsigned long start, unsigned long end)
136{
137	int pages = 0;
138	for (; start < end; start += PAGE_SIZE) {
139		ClearPageReserved(virt_to_page(start));
140		set_page_count(virt_to_page(start), 1);
141		free_page(start);
142		totalram_pages++;
143		pages++;
144	}
145	printk ("Freeing initrd memory: %dk freed\n", pages);
146}
147#endif