1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
|
/*
* linux/arch/cris/mm/init.c
*
* Copyright (C) 1995 Linus Torvalds
* Copyright (C) 2000,2001 Axis Communications AB
*
* Authors: Bjorn Wesen (bjornw@axis.com)
*
*/
#include <linux/gfp.h>
#include <linux/init.h>
#include <linux/bootmem.h>
#include <asm/tlb.h>
DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
unsigned long empty_zero_page;
extern char _stext, _edata, _etext; /* From linkerscript */
extern char __init_begin, __init_end;
void __init
mem_init(void)
{
int codesize, reservedpages, datasize, initsize;
unsigned long tmp;
BUG_ON(!mem_map);
/* max/min_low_pfn was set by setup.c
* now we just copy it to some other necessary places...
*
* high_memory was also set in setup.c
*/
max_mapnr = num_physpages = max_low_pfn - min_low_pfn;
/* this will put all memory onto the freelists */
totalram_pages = free_all_bootmem();
reservedpages = 0;
for (tmp = 0; tmp < max_mapnr; tmp++) {
/*
* Only count reserved RAM pages
*/
if (PageReserved(mem_map + tmp))
reservedpages++;
}
codesize = (unsigned long) &_etext - (unsigned long) &_stext;
datasize = (unsigned long) &_edata - (unsigned long) &_etext;
initsize = (unsigned long) &__init_end - (unsigned long) &__init_begin;
printk(KERN_INFO
"Memory: %luk/%luk available (%dk kernel code, %dk reserved, %dk data, "
"%dk init)\n" ,
nr_free_pages() << (PAGE_SHIFT-10),
max_mapnr << (PAGE_SHIFT-10),
codesize >> 10,
reservedpages << (PAGE_SHIFT-10),
datasize >> 10,
initsize >> 10
);
}
/* free the pages occupied by initialization code */
void
free_initmem(void)
{
unsigned long addr;
addr = (unsigned long)(&__init_begin);
for (; addr < (unsigned long)(&__init_end); addr += PAGE_SIZE) {
ClearPageReserved(virt_to_page(addr));
init_page_count(virt_to_page(addr));
free_page(addr);
totalram_pages++;
}
printk (KERN_INFO "Freeing unused kernel memory: %luk freed\n",
(unsigned long)((&__init_end - &__init_begin) >> 10));
}
|
