blob: 7cc3380f250cc608ea8815472a5652d2b1b04c3b [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * linux/arch/h8300/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/m68knommu/mm/init.c
11 * linux/arch/m68k/mm/init.c
12 *
13 * Copyright (C) 1995 Hamish Macdonald
14 *
15 * JAN/1999 -- hacked to support ColdFire (gerg@snapgear.com)
16 * DEC/2000 -- linux 2.4 support <davidm@snapgear.com>
17 */
18
Linus Torvalds1da177e2005-04-16 15:20:36 -070019#include <linux/signal.h>
20#include <linux/sched.h>
21#include <linux/kernel.h>
22#include <linux/errno.h>
23#include <linux/string.h>
24#include <linux/types.h>
25#include <linux/ptrace.h>
26#include <linux/mman.h>
27#include <linux/mm.h>
28#include <linux/swap.h>
29#include <linux/init.h>
30#include <linux/highmem.h>
31#include <linux/pagemap.h>
32#include <linux/bootmem.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090033#include <linux/gfp.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070034
35#include <asm/setup.h>
36#include <asm/segment.h>
37#include <asm/page.h>
38#include <asm/pgtable.h>
39#include <asm/system.h>
40
41#undef DEBUG
42
Linus Torvalds1da177e2005-04-16 15:20:36 -070043/*
44 * BAD_PAGE is the page that is used for page faults when linux
45 * is out-of-memory. Older versions of linux just did a
46 * do_exit(), but using this instead means there is less risk
47 * for a process dying in kernel mode, possibly leaving a inode
48 * unused etc..
49 *
50 * BAD_PAGETABLE is the accompanying page-table: it is initialized
51 * to point to BAD_PAGE entries.
52 *
53 * ZERO_PAGE is a special page that is used for zero-initialized
54 * data and COW.
55 */
56static unsigned long empty_bad_page_table;
57
58static unsigned long empty_bad_page;
59
60unsigned long empty_zero_page;
61
62extern unsigned long rom_length;
63
Linus Torvalds1da177e2005-04-16 15:20:36 -070064extern unsigned long memory_start;
65extern unsigned long memory_end;
66
67/*
68 * paging_init() continues the virtual memory environment setup which
69 * was begun by the code in arch/head.S.
70 * The parameters are pointers to where to stick the starting and ending
71 * addresses of available kernel virtual memory.
72 */
Yoshinori Sato9de15e92008-08-12 15:08:43 -070073void __init paging_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -070074{
75 /*
76 * Make sure start_mem is page aligned, otherwise bootmem and
77 * page_alloc get different views og the world.
78 */
79#ifdef DEBUG
80 unsigned long start_mem = PAGE_ALIGN(memory_start);
81#endif
82 unsigned long end_mem = memory_end & PAGE_MASK;
83
84#ifdef DEBUG
85 printk ("start_mem is %#lx\nvirtual_end is %#lx\n",
86 start_mem, end_mem);
87#endif
88
89 /*
90 * Initialize the bad page table and bad page to point
91 * to a couple of allocated pages.
92 */
93 empty_bad_page_table = (unsigned long)alloc_bootmem_pages(PAGE_SIZE);
94 empty_bad_page = (unsigned long)alloc_bootmem_pages(PAGE_SIZE);
95 empty_zero_page = (unsigned long)alloc_bootmem_pages(PAGE_SIZE);
96 memset((void *)empty_zero_page, 0, PAGE_SIZE);
97
98 /*
99 * Set up SFC/DFC registers (user data space).
100 */
101 set_fs (USER_DS);
102
103#ifdef DEBUG
104 printk ("before free_area_init\n");
105
106 printk ("free_area_init -> start_mem is %#lx\nvirtual_end is %#lx\n",
107 start_mem, end_mem);
108#endif
109
110 {
Christoph Lameterf06a9682006-09-25 23:31:10 -0700111 unsigned long zones_size[MAX_NR_ZONES] = {0, };
Linus Torvalds1da177e2005-04-16 15:20:36 -0700112
113 zones_size[ZONE_DMA] = 0 >> PAGE_SHIFT;
114 zones_size[ZONE_NORMAL] = (end_mem - PAGE_OFFSET) >> PAGE_SHIFT;
115#ifdef CONFIG_HIGHMEM
116 zones_size[ZONE_HIGHMEM] = 0;
117#endif
118 free_area_init(zones_size);
119 }
120}
121
Yoshinori Sato9de15e92008-08-12 15:08:43 -0700122void __init mem_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700123{
124 int codek = 0, datak = 0, initk = 0;
125 /* DAVIDM look at setup memory map generically with reserved area */
126 unsigned long tmp;
127 extern char _etext, _stext, _sdata, _ebss, __init_begin, __init_end;
128 extern unsigned long _ramend, _ramstart;
129 unsigned long len = &_ramend - &_ramstart;
130 unsigned long start_mem = memory_start; /* DAVIDM - these must start at end of kernel */
131 unsigned long end_mem = memory_end; /* DAVIDM - this must not include kernel stack at top */
132
133#ifdef DEBUG
134 printk(KERN_DEBUG "Mem_init: start=%lx, end=%lx\n", start_mem, end_mem);
135#endif
136
137 end_mem &= PAGE_MASK;
138 high_memory = (void *) end_mem;
139
140 start_mem = PAGE_ALIGN(start_mem);
141 max_mapnr = num_physpages = MAP_NR(high_memory);
142
143 /* this will put all memory onto the freelists */
144 totalram_pages = free_all_bootmem();
145
146 codek = (&_etext - &_stext) >> 10;
147 datak = (&_ebss - &_sdata) >> 10;
148 initk = (&__init_begin - &__init_end) >> 10;
149
150 tmp = nr_free_pages() << PAGE_SHIFT;
151 printk(KERN_INFO "Memory available: %luk/%luk RAM, %luk/%luk ROM (%dk kernel code, %dk data)\n",
152 tmp >> 10,
153 len >> 10,
154 (rom_length > 0) ? ((rom_length >> 10) - codek) : 0,
155 rom_length >> 10,
156 codek,
157 datak
158 );
159}
160
161
162#ifdef CONFIG_BLK_DEV_INITRD
163void free_initrd_mem(unsigned long start, unsigned long end)
164{
165 int pages = 0;
166 for (; start < end; start += PAGE_SIZE) {
167 ClearPageReserved(virt_to_page(start));
Nick Piggin7835e982006-03-22 00:08:40 -0800168 init_page_count(virt_to_page(start));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700169 free_page(start);
170 totalram_pages++;
171 pages++;
172 }
173 printk ("Freeing initrd memory: %dk freed\n", pages);
174}
175#endif
176
177void
Yoshinori Sato9de15e92008-08-12 15:08:43 -0700178free_initmem(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700179{
180#ifdef CONFIG_RAMKERNEL
181 unsigned long addr;
182 extern char __init_begin, __init_end;
183/*
184 * the following code should be cool even if these sections
185 * are not page aligned.
186 */
187 addr = PAGE_ALIGN((unsigned long)(&__init_begin));
188 /* next to check that the page we free is not a partial page */
189 for (; addr + PAGE_SIZE < (unsigned long)(&__init_end); addr +=PAGE_SIZE) {
190 ClearPageReserved(virt_to_page(addr));
Nick Piggin7835e982006-03-22 00:08:40 -0800191 init_page_count(virt_to_page(addr));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700192 free_page(addr);
193 totalram_pages++;
194 }
195 printk(KERN_INFO "Freeing unused kernel memory: %ldk freed (0x%x - 0x%x)\n",
196 (addr - PAGE_ALIGN((long) &__init_begin)) >> 10,
197 (int)(PAGE_ALIGN((unsigned long)(&__init_begin))),
198 (int)(addr - PAGE_SIZE));
199#endif
200}
201