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/module.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#include <linux/gfp.h>
 21
 22#include <asm/setup.h>
 23#include <asm/uaccess.h>
 24#include <asm/page.h>
 25#include <asm/pgalloc.h>
 26#include <asm/system.h>
 27#include <asm/machdep.h>
 28#include <asm/io.h>
 29#ifdef CONFIG_ATARI
 30#include <asm/atari_stram.h>
 31#endif
 32#include <asm/sections.h>
 33#include <asm/tlb.h>
 34
 35pg_data_t pg_data_map[MAX_NUMNODES];
 36EXPORT_SYMBOL(pg_data_map);
 37
 38int m68k_virt_to_node_shift;
 39
 40#ifndef CONFIG_SINGLE_MEMORY_CHUNK
 41pg_data_t *pg_data_table[65];
 42EXPORT_SYMBOL(pg_data_table);
 43#endif
 44
 45void __init m68k_setup_node(int node)
 46{
 47#ifndef CONFIG_SINGLE_MEMORY_CHUNK
 48	struct mem_info *info = m68k_memory + node;
 49	int i, end;
 50
 51	i = (unsigned long)phys_to_virt(info->addr) >> __virt_to_node_shift();
 52	end = (unsigned long)phys_to_virt(info->addr + info->size - 1) >> __virt_to_node_shift();
 53	for (; i <= end; i++) {
 54		if (pg_data_table[i])
 55			printk("overlap at %u for chunk %u\n", i, node);
 56		pg_data_table[i] = pg_data_map + node;
 57	}
 58#endif
 59	pg_data_map[node].bdata = bootmem_node_data + node;
 60	node_set_online(node);
 61}
 62
 63
 64/*
 65 * ZERO_PAGE is a special page that is used for zero-initialized
 66 * data and COW.
 67 */
 68
 69void *empty_zero_page;
 70EXPORT_SYMBOL(empty_zero_page);
 71
 72extern void init_pointer_table(unsigned long ptable);
 73
 74/* References to section boundaries */
 75
 76extern pmd_t *zero_pgtable;
 77
 78void __init mem_init(void)
 79{
 80	pg_data_t *pgdat;
 81	int codepages = 0;
 82	int datapages = 0;
 83	int initpages = 0;
 84	int i;
 85
 86	/* this will put all memory onto the freelists */
 87	totalram_pages = num_physpages = 0;
 88	for_each_online_pgdat(pgdat) {
 89		num_physpages += pgdat->node_present_pages;
 90
 91		totalram_pages += free_all_bootmem_node(pgdat);
 92		for (i = 0; i < pgdat->node_spanned_pages; i++) {
 93			struct page *page = pgdat->node_mem_map + i;
 94			char *addr = page_to_virt(page);
 95
 96			if (!PageReserved(page))
 97				continue;
 98			if (addr >= _text &&
 99			    addr < _etext)
100				codepages++;
101			else if (addr >= __init_begin &&
102				 addr < __init_end)
103				initpages++;
104			else
105				datapages++;
106		}
107	}
108
109#ifndef CONFIG_SUN3
110	/* insert pointer tables allocated so far into the tablelist */
111	init_pointer_table((unsigned long)kernel_pg_dir);
112	for (i = 0; i < PTRS_PER_PGD; i++) {
113		if (pgd_present(kernel_pg_dir[i]))
114			init_pointer_table(__pgd_page(kernel_pg_dir[i]));
115	}
116
117	/* insert also pointer table that we used to unmap the zero page */
118	if (zero_pgtable)
119		init_pointer_table((unsigned long)zero_pgtable);
120#endif
121
122	printk("Memory: %luk/%luk available (%dk kernel code, %dk data, %dk init)\n",
123	       nr_free_pages() << (PAGE_SHIFT-10),
124	       totalram_pages << (PAGE_SHIFT-10),
125	       codepages << (PAGE_SHIFT-10),
126	       datapages << (PAGE_SHIFT-10),
127	       initpages << (PAGE_SHIFT-10));
128}
129
130#ifdef CONFIG_BLK_DEV_INITRD
131void free_initrd_mem(unsigned long start, unsigned long end)
132{
133	int pages = 0;
134	for (; start < end; start += PAGE_SIZE) {
135		ClearPageReserved(virt_to_page(start));
136		init_page_count(virt_to_page(start));
137		free_page(start);
138		totalram_pages++;
139		pages++;
140	}
141	printk ("Freeing initrd memory: %dk freed\n", pages);
142}
143#endif