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
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
35static bootmem_data_t __initdata bootmem_data[MAX_NUMNODES];
36
37pg_data_t pg_data_map[MAX_NUMNODES];
38EXPORT_SYMBOL(pg_data_map);
39
40int m68k_virt_to_node_shift;
41
42#ifndef CONFIG_SINGLE_MEMORY_CHUNK
43pg_data_t *pg_data_table[65];
44EXPORT_SYMBOL(pg_data_table);
45#endif
46
47void m68k_setup_node(int node)
48{
49#ifndef CONFIG_SINGLE_MEMORY_CHUNK
50	struct mem_info *info = m68k_memory + node;
51	int i, end;
52
53	i = (unsigned long)phys_to_virt(info->addr) >> __virt_to_node_shift();
54	end = (unsigned long)phys_to_virt(info->addr + info->size - 1) >> __virt_to_node_shift();
55	for (; i <= end; i++) {
56		if (pg_data_table[i])
57			printk("overlap at %u for chunk %u\n", i, node);
58		pg_data_table[i] = pg_data_map + node;
59	}
60#endif
61	pg_data_map[node].bdata = bootmem_data + node;
62	node_set_online(node);
63}
64
65
66/*
67 * ZERO_PAGE is a special page that is used for zero-initialized
68 * data and COW.
69 */
70
71void *empty_zero_page;
72
73void show_mem(void)
74{
75	pg_data_t *pgdat;
76	int free = 0, total = 0, reserved = 0, shared = 0;
77	int cached = 0;
78	int i;
79
80	printk("\nMem-info:\n");
81	show_free_areas();
82	printk("Free swap:       %6ldkB\n", nr_swap_pages<<(PAGE_SHIFT-10));
83	for_each_online_pgdat(pgdat) {
84		for (i = 0; i < pgdat->node_spanned_pages; i++) {
85			struct page *page = pgdat->node_mem_map + i;
86			total++;
87			if (PageReserved(page))
88				reserved++;
89			else if (PageSwapCache(page))
90				cached++;
91			else if (!page_count(page))
92				free++;
93			else
94				shared += page_count(page) - 1;
95		}
96	}
97	printk("%d pages of RAM\n",total);
98	printk("%d free pages\n",free);
99	printk("%d reserved pages\n",reserved);
100	printk("%d pages shared\n",shared);
101	printk("%d pages swap cached\n",cached);
102}
103
104extern void init_pointer_table(unsigned long ptable);
105
106/* References to section boundaries */
107
108extern char _text[], _etext[];
109extern char __init_begin[], __init_end[];
110
111extern pmd_t *zero_pgtable;
112
113void __init mem_init(void)
114{
115	pg_data_t *pgdat;
116	int codepages = 0;
117	int datapages = 0;
118	int initpages = 0;
119	int i;
120
121#ifdef CONFIG_ATARI
122	if (MACH_IS_ATARI)
123		atari_stram_mem_init_hook();
124#endif
125
126	/* this will put all memory onto the freelists */
127	totalram_pages = num_physpages = 0;
128	for_each_online_pgdat(pgdat) {
129		num_physpages += pgdat->node_present_pages;
130
131		totalram_pages += free_all_bootmem_node(pgdat);
132		for (i = 0; i < pgdat->node_spanned_pages; i++) {
133			struct page *page = pgdat->node_mem_map + i;
134			char *addr = page_to_virt(page);
135
136			if (!PageReserved(page))
137				continue;
138			if (addr >= _text &&
139			    addr < _etext)
140				codepages++;
141			else if (addr >= __init_begin &&
142				 addr < __init_end)
143				initpages++;
144			else
145				datapages++;
146		}
147	}
148
149#ifndef CONFIG_SUN3
150	/* insert pointer tables allocated so far into the tablelist */
151	init_pointer_table((unsigned long)kernel_pg_dir);
152	for (i = 0; i < PTRS_PER_PGD; i++) {
153		if (pgd_present(kernel_pg_dir[i]))
154			init_pointer_table(__pgd_page(kernel_pg_dir[i]));
155	}
156
157	/* insert also pointer table that we used to unmap the zero page */
158	if (zero_pgtable)
159		init_pointer_table((unsigned long)zero_pgtable);
160#endif
161
162	printk("Memory: %luk/%luk available (%dk kernel code, %dk data, %dk init)\n",
163	       (unsigned long)nr_free_pages() << (PAGE_SHIFT-10),
164	       totalram_pages << (PAGE_SHIFT-10),
165	       codepages << (PAGE_SHIFT-10),
166	       datapages << (PAGE_SHIFT-10),
167	       initpages << (PAGE_SHIFT-10));
168}
169
170#ifdef CONFIG_BLK_DEV_INITRD
171void free_initrd_mem(unsigned long start, unsigned long end)
172{
173	int pages = 0;
174	for (; start < end; start += PAGE_SIZE) {
175		ClearPageReserved(virt_to_page(start));
176		init_page_count(virt_to_page(start));
177		free_page(start);
178		totalram_pages++;
179		pages++;
180	}
181	printk ("Freeing initrd memory: %dk freed\n", pages);
182}
183#endif
184