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review.evervolv.com / android_kernel_oneplus_sm8150 / aa93466bdfd901b926e033801f0b82b3eaa67be2 / . / arch / m68k / mm / init.c
blob: c45beb955943d6c1d5e3c89e6917b8de9ec0bca3 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]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