5113f6f70
 김현기
kernel add
|
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
84
85
86
87
88
89
90
91
92
|
/*
* Copyright (C) 2000, 2004 Maciej W. Rozycki
* Copyright (C) 2003, 07 Ralf Baechle (ralf@linux-mips.org)
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*/
#ifndef __ASM_DIV64_H
#define __ASM_DIV64_H
#include <asm-generic/div64.h>
#if BITS_PER_LONG == 64
#include <linux/types.h>
/*
* No traps on overflows for any of these...
*/
#define __div64_32(n, base) \
({ \
unsigned long __cf, __tmp, __tmp2, __i; \
unsigned long __quot32, __mod32; \
unsigned long __high, __low; \
unsigned long long __n; \
\
__high = *__n >> 32; \
__low = __n; \
__asm__( \
" .set push
" \
" .set noat
" \
" .set noreorder
" \
" move %2, $0
" \
" move %3, $0
" \
" b 1f
" \
" li %4, 0x21
" \
"0:
" \
" sll $1, %0, 0x1
" \
" srl %3, %0, 0x1f
" \
" or %0, $1, %5
" \
" sll %1, %1, 0x1
" \
" sll %2, %2, 0x1
" \
"1:
" \
" bnez %3, 2f
" \
" sltu %5, %0, %z6
" \
" bnez %5, 3f
" \
"2:
" \
" addiu %4, %4, -1
" \
" subu %0, %0, %z6
" \
" addiu %2, %2, 1
" \
"3:
" \
" bnez %4, 0b
\t" \
" srl %5, %1, 0x1f
\t" \
" .set pop" \
: "=&r" (__mod32), "=&r" (__tmp), \
"=&r" (__quot32), "=&r" (__cf), \
"=&r" (__i), "=&r" (__tmp2) \
: "Jr" (base), "0" (__high), "1" (__low)); \
\
(__n) = __quot32; \
__mod32; \
})
#endif /* BITS_PER_LONG == 64 */
#endif /* __ASM_DIV64_H */
|