Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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kernel
os
linux
1/*
2 * Copyright (C) 2000, 2004 Maciej W. Rozycki
3 * Copyright (C) 2003 Ralf Baechle
4 *
5 * This file is subject to the terms and conditions of the GNU General Public
6 * License. See the file "COPYING" in the main directory of this archive
7 * for more details.
8 */
9#ifndef _ASM_DIV64_H
10#define _ASM_DIV64_H
11
12#if (_MIPS_SZLONG == 32)
13
14#include <asm/compiler.h>
15
16/*
17 * No traps on overflows for any of these...
18 */
19
20#define do_div64_32(res, high, low, base) ({ \
21 unsigned long __quot, __mod; \
22 unsigned long __cf, __tmp, __tmp2, __i; \
23 \
24 __asm__(".set push\n\t" \
25 ".set noat\n\t" \
26 ".set noreorder\n\t" \
27 "move %2, $0\n\t" \
28 "move %3, $0\n\t" \
29 "b 1f\n\t" \
30 " li %4, 0x21\n" \
31 "0:\n\t" \
32 "sll $1, %0, 0x1\n\t" \
33 "srl %3, %0, 0x1f\n\t" \
34 "or %0, $1, %5\n\t" \
35 "sll %1, %1, 0x1\n\t" \
36 "sll %2, %2, 0x1\n" \
37 "1:\n\t" \
38 "bnez %3, 2f\n\t" \
39 " sltu %5, %0, %z6\n\t" \
40 "bnez %5, 3f\n" \
41 "2:\n\t" \
42 " addiu %4, %4, -1\n\t" \
43 "subu %0, %0, %z6\n\t" \
44 "addiu %2, %2, 1\n" \
45 "3:\n\t" \
46 "bnez %4, 0b\n\t" \
47 " srl %5, %1, 0x1f\n\t" \
48 ".set pop" \
49 : "=&r" (__mod), "=&r" (__tmp), "=&r" (__quot), "=&r" (__cf), \
50 "=&r" (__i), "=&r" (__tmp2) \
51 : "Jr" (base), "0" (high), "1" (low)); \
52 \
53 (res) = __quot; \
54 __mod; })
55
56#define do_div(n, base) ({ \
57 unsigned long long __quot; \
58 unsigned long __mod; \
59 unsigned long long __div; \
60 unsigned long __upper, __low, __high, __base; \
61 \
62 __div = (n); \
63 __base = (base); \
64 \
65 __high = __div >> 32; \
66 __low = __div; \
67 __upper = __high; \
68 \
69 if (__high) \
70 __asm__("divu $0, %z2, %z3" \
71 : "=h" (__upper), "=l" (__high) \
72 : "Jr" (__high), "Jr" (__base) \
73 : GCC_REG_ACCUM); \
74 \
75 __mod = do_div64_32(__low, __upper, __low, __base); \
76 \
77 __quot = __high; \
78 __quot = __quot << 32 | __low; \
79 (n) = __quot; \
80 __mod; })
81#endif /* (_MIPS_SZLONG == 32) */
82
83#if (_MIPS_SZLONG == 64)
84
85/*
86 * Don't use this one in new code
87 */
88#define do_div64_32(res, high, low, base) ({ \
89 unsigned int __quot, __mod; \
90 unsigned long __div; \
91 unsigned int __low, __high, __base; \
92 \
93 __high = (high); \
94 __low = (low); \
95 __div = __high; \
96 __div = __div << 32 | __low; \
97 __base = (base); \
98 \
99 __mod = __div % __base; \
100 __div = __div / __base; \
101 \
102 __quot = __div; \
103 (res) = __quot; \
104 __mod; })
105
106/*
107 * Hey, we're already 64-bit, no
108 * need to play games..
109 */
110#define do_div(n, base) ({ \
111 unsigned long __quot; \
112 unsigned int __mod; \
113 unsigned long __div; \
114 unsigned int __base; \
115 \
116 __div = (n); \
117 __base = (base); \
118 \
119 __mod = __div % __base; \
120 __quot = __div / __base; \
121 \
122 (n) = __quot; \
123 __mod; })
124
125#endif /* (_MIPS_SZLONG == 64) */
126
127#endif /* _ASM_DIV64_H */