blob: 50cd12cf28d97555bdfa45c7e6c256d1af82df3f [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * linux/arch/m68knommu/mm/init.c
3 *
4 * Copyright (C) 1998 D. Jeff Dionne <jeff@lineo.ca>,
5 * Kenneth Albanowski <kjahds@kjahds.com>,
6 * Copyright (C) 2000 Lineo, Inc. (www.lineo.com)
7 *
8 * Based on:
9 *
10 * linux/arch/m68k/mm/init.c
11 *
12 * Copyright (C) 1995 Hamish Macdonald
13 *
14 * JAN/1999 -- hacked to support ColdFire (gerg@snapgear.com)
15 * DEC/2000 -- linux 2.4 support <davidm@snapgear.com>
16 */
17
Linus Torvalds1da177e2005-04-16 15:20:36 -070018#include <linux/signal.h>
19#include <linux/sched.h>
20#include <linux/kernel.h>
21#include <linux/errno.h>
22#include <linux/string.h>
23#include <linux/types.h>
24#include <linux/ptrace.h>
25#include <linux/mman.h>
26#include <linux/mm.h>
27#include <linux/swap.h>
28#include <linux/init.h>
29#include <linux/highmem.h>
30#include <linux/pagemap.h>
31#include <linux/bootmem.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090032#include <linux/gfp.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070033
34#include <asm/setup.h>
35#include <asm/segment.h>
36#include <asm/page.h>
37#include <asm/pgtable.h>
38#include <asm/system.h>
39#include <asm/machdep.h>
40
Linus Torvalds1da177e2005-04-16 15:20:36 -070041/*
Linus Torvalds1da177e2005-04-16 15:20:36 -070042 * ZERO_PAGE is a special page that is used for zero-initialized
43 * data and COW.
44 */
Geert Uytterhoeven45d15642011-05-25 11:10:59 +020045void *empty_zero_page;
Linus Torvalds1da177e2005-04-16 15:20:36 -070046
Linus Torvalds1da177e2005-04-16 15:20:36 -070047extern unsigned long memory_start;
48extern unsigned long memory_end;
49
50/*
51 * paging_init() continues the virtual memory environment setup which
52 * was begun by the code in arch/head.S.
53 * The parameters are pointers to where to stick the starting and ending
54 * addresses of available kernel virtual memory.
55 */
Greg Ungererf386c3c2007-10-24 12:03:46 +100056void __init paging_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -070057{
58 /*
59 * Make sure start_mem is page aligned, otherwise bootmem and
60 * page_alloc get different views of the world.
61 */
Linus Torvalds1da177e2005-04-16 15:20:36 -070062 unsigned long end_mem = memory_end & PAGE_MASK;
Greg Ungererb1ffa252011-03-29 13:39:47 +100063 unsigned long zones_size[MAX_NR_ZONES] = {0, };
Linus Torvalds1da177e2005-04-16 15:20:36 -070064
Geert Uytterhoeven45d15642011-05-25 11:10:59 +020065 empty_zero_page = alloc_bootmem_pages(PAGE_SIZE);
66 memset(empty_zero_page, 0, PAGE_SIZE);
Linus Torvalds1da177e2005-04-16 15:20:36 -070067
68 /*
69 * Set up SFC/DFC registers (user data space).
70 */
71 set_fs (USER_DS);
72
Greg Ungererb1ffa252011-03-29 13:39:47 +100073 zones_size[ZONE_DMA] = (end_mem - PAGE_OFFSET) >> PAGE_SHIFT;
74 free_area_init(zones_size);
Linus Torvalds1da177e2005-04-16 15:20:36 -070075}
76
Greg Ungererf386c3c2007-10-24 12:03:46 +100077void __init mem_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -070078{
79 int codek = 0, datak = 0, initk = 0;
80 unsigned long tmp;
81 extern char _etext, _stext, _sdata, _ebss, __init_begin, __init_end;
82 extern unsigned int _ramend, _rambase;
83 unsigned long len = _ramend - _rambase;
84 unsigned long start_mem = memory_start; /* DAVIDM - these must start at end of kernel */
85 unsigned long end_mem = memory_end; /* DAVIDM - this must not include kernel stack at top */
86
Joe Perches308e6102009-05-15 10:59:37 -070087 pr_debug("Mem_init: start=%lx, end=%lx\n", start_mem, end_mem);
Linus Torvalds1da177e2005-04-16 15:20:36 -070088
89 end_mem &= PAGE_MASK;
90 high_memory = (void *) end_mem;
91
92 start_mem = PAGE_ALIGN(start_mem);
93 max_mapnr = num_physpages = (((unsigned long) high_memory) - PAGE_OFFSET) >> PAGE_SHIFT;
94
95 /* this will put all memory onto the freelists */
96 totalram_pages = free_all_bootmem();
97
98 codek = (&_etext - &_stext) >> 10;
99 datak = (&_ebss - &_sdata) >> 10;
100 initk = (&__init_begin - &__init_end) >> 10;
101
102 tmp = nr_free_pages() << PAGE_SHIFT;
Greg Ungerer2082b472006-06-26 10:33:10 +1000103 printk(KERN_INFO "Memory available: %luk/%luk RAM, (%dk kernel code, %dk data)\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700104 tmp >> 10,
105 len >> 10,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700106 codek,
107 datak
108 );
109}
110
111
112#ifdef CONFIG_BLK_DEV_INITRD
113void free_initrd_mem(unsigned long start, unsigned long end)
114{
115 int pages = 0;
116 for (; start < end; start += PAGE_SIZE) {
117 ClearPageReserved(virt_to_page(start));
Nick Piggin7835e982006-03-22 00:08:40 -0800118 init_page_count(virt_to_page(start));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700119 free_page(start);
120 totalram_pages++;
121 pages++;
122 }
Geert Uytterhoeven6617eaf2011-05-26 14:44:10 +1000123 pr_notice("Freeing initrd memory: %luk freed\n",
124 pages * (PAGE_SIZE / 1024));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700125}
126#endif
127
Greg Ungererb1ffa252011-03-29 13:39:47 +1000128void free_initmem(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700129{
130#ifdef CONFIG_RAMKERNEL
131 unsigned long addr;
132 extern char __init_begin, __init_end;
133 /*
134 * The following code should be cool even if these sections
135 * are not page aligned.
136 */
137 addr = PAGE_ALIGN((unsigned long)(&__init_begin));
138 /* next to check that the page we free is not a partial page */
139 for (; addr + PAGE_SIZE < (unsigned long)(&__init_end); addr +=PAGE_SIZE) {
140 ClearPageReserved(virt_to_page(addr));
Nick Piggin7835e982006-03-22 00:08:40 -0800141 init_page_count(virt_to_page(addr));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700142 free_page(addr);
143 totalram_pages++;
144 }
Geert Uytterhoeven6617eaf2011-05-26 14:44:10 +1000145 pr_notice("Freeing unused kernel memory: %luk freed (0x%x - 0x%x)\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700146 (addr - PAGE_ALIGN((long) &__init_begin)) >> 10,
147 (int)(PAGE_ALIGN((unsigned long)(&__init_begin))),
148 (int)(addr - PAGE_SIZE));
149#endif
150}
151