2 * linux/arch/m68knommu/mm/init.c
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)
10 * linux/arch/m68k/mm/init.c
12 * Copyright (C) 1995 Hamish Macdonald
14 * JAN/1999 -- hacked to support ColdFire (gerg@snapgear.com)
15 * DEC/2000 -- linux 2.4 support <davidm@snapgear.com>
18 #include <linux/config.h>
19 #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>
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>
33 #include <linux/slab.h>
35 #include <asm/setup.h>
36 #include <asm/segment.h>
38 #include <asm/pgtable.h>
39 #include <asm/system.h>
40 #include <asm/machdep.h>
44 extern void die_if_kernel(char *,struct pt_regs
*,long);
45 extern void free_initmem(void);
48 * BAD_PAGE is the page that is used for page faults when linux
49 * is out-of-memory. Older versions of linux just did a
50 * do_exit(), but using this instead means there is less risk
51 * for a process dying in kernel mode, possibly leaving a inode
54 * BAD_PAGETABLE is the accompanying page-table: it is initialized
55 * to point to BAD_PAGE entries.
57 * ZERO_PAGE is a special page that is used for zero-initialized
60 static unsigned long empty_bad_page_table
;
62 static unsigned long empty_bad_page
;
64 unsigned long empty_zero_page
;
69 int free
= 0, total
= 0, reserved
= 0, shared
= 0;
72 printk(KERN_INFO
"\nMem-info:\n");
77 if (PageReserved(mem_map
+i
))
79 else if (PageSwapCache(mem_map
+i
))
81 else if (!page_count(mem_map
+i
))
84 shared
+= page_count(mem_map
+i
) - 1;
86 printk(KERN_INFO
"%d pages of RAM\n",total
);
87 printk(KERN_INFO
"%d free pages\n",free
);
88 printk(KERN_INFO
"%d reserved pages\n",reserved
);
89 printk(KERN_INFO
"%d pages shared\n",shared
);
90 printk(KERN_INFO
"%d pages swap cached\n",cached
);
93 extern unsigned long memory_start
;
94 extern unsigned long memory_end
;
97 * paging_init() continues the virtual memory environment setup which
98 * was begun by the code in arch/head.S.
99 * The parameters are pointers to where to stick the starting and ending
100 * addresses of available kernel virtual memory.
102 void paging_init(void)
105 * Make sure start_mem is page aligned, otherwise bootmem and
106 * page_alloc get different views of the world.
109 unsigned long start_mem
= PAGE_ALIGN(memory_start
);
111 unsigned long end_mem
= memory_end
& PAGE_MASK
;
114 printk (KERN_DEBUG
"start_mem is %#lx\nvirtual_end is %#lx\n",
119 * Initialize the bad page table and bad page to point
120 * to a couple of allocated pages.
122 empty_bad_page_table
= (unsigned long)alloc_bootmem_pages(PAGE_SIZE
);
123 empty_bad_page
= (unsigned long)alloc_bootmem_pages(PAGE_SIZE
);
124 empty_zero_page
= (unsigned long)alloc_bootmem_pages(PAGE_SIZE
);
125 memset((void *)empty_zero_page
, 0, PAGE_SIZE
);
128 * Set up SFC/DFC registers (user data space).
133 printk (KERN_DEBUG
"before free_area_init\n");
135 printk (KERN_DEBUG
"free_area_init -> start_mem is %#lx\nvirtual_end is %#lx\n",
140 unsigned long zones_size
[MAX_NR_ZONES
] = {0, 0, 0};
142 zones_size
[ZONE_DMA
] = 0 >> PAGE_SHIFT
;
143 zones_size
[ZONE_NORMAL
] = (end_mem
- PAGE_OFFSET
) >> PAGE_SHIFT
;
144 #ifdef CONFIG_HIGHMEM
145 zones_size
[ZONE_HIGHMEM
] = 0;
147 free_area_init(zones_size
);
153 int codek
= 0, datak
= 0, initk
= 0;
155 extern char _etext
, _stext
, _sdata
, _ebss
, __init_begin
, __init_end
;
156 extern unsigned int _ramend
, _rambase
;
157 unsigned long len
= _ramend
- _rambase
;
158 unsigned long start_mem
= memory_start
; /* DAVIDM - these must start at end of kernel */
159 unsigned long end_mem
= memory_end
; /* DAVIDM - this must not include kernel stack at top */
162 printk(KERN_DEBUG
"Mem_init: start=%lx, end=%lx\n", start_mem
, end_mem
);
165 end_mem
&= PAGE_MASK
;
166 high_memory
= (void *) end_mem
;
168 start_mem
= PAGE_ALIGN(start_mem
);
169 max_mapnr
= num_physpages
= (((unsigned long) high_memory
) - PAGE_OFFSET
) >> PAGE_SHIFT
;
171 /* this will put all memory onto the freelists */
172 totalram_pages
= free_all_bootmem();
174 codek
= (&_etext
- &_stext
) >> 10;
175 datak
= (&_ebss
- &_sdata
) >> 10;
176 initk
= (&__init_begin
- &__init_end
) >> 10;
178 tmp
= nr_free_pages() << PAGE_SHIFT
;
179 printk(KERN_INFO
"Memory available: %luk/%luk RAM, (%dk kernel code, %dk data)\n",
188 #ifdef CONFIG_BLK_DEV_INITRD
189 void free_initrd_mem(unsigned long start
, unsigned long end
)
192 for (; start
< end
; start
+= PAGE_SIZE
) {
193 ClearPageReserved(virt_to_page(start
));
194 init_page_count(virt_to_page(start
));
199 printk (KERN_NOTICE
"Freeing initrd memory: %dk freed\n", pages
);
206 #ifdef CONFIG_RAMKERNEL
208 extern char __init_begin
, __init_end
;
210 * The following code should be cool even if these sections
211 * are not page aligned.
213 addr
= PAGE_ALIGN((unsigned long)(&__init_begin
));
214 /* next to check that the page we free is not a partial page */
215 for (; addr
+ PAGE_SIZE
< (unsigned long)(&__init_end
); addr
+=PAGE_SIZE
) {
216 ClearPageReserved(virt_to_page(addr
));
217 init_page_count(virt_to_page(addr
));
221 printk(KERN_NOTICE
"Freeing unused kernel memory: %ldk freed (0x%x - 0x%x)\n",
222 (addr
- PAGE_ALIGN((long) &__init_begin
)) >> 10,
223 (int)(PAGE_ALIGN((unsigned long)(&__init_begin
))),
224 (int)(addr
- PAGE_SIZE
));
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