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1da177e4 LT |
1 | /* |
2 | * Copyright (C) 2000, 2004 Maciej W. Rozycki | |
3927f2e8 | 3 | * Copyright (C) 2003, 07 Ralf Baechle (ralf@linux-mips.org) |
1da177e4 LT |
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 | ||
3927f2e8 SH |
12 | #include <linux/types.h> |
13 | ||
1da177e4 LT |
14 | #if (_MIPS_SZLONG == 32) |
15 | ||
16 | #include <asm/compiler.h> | |
17 | ||
18 | /* | |
19 | * No traps on overflows for any of these... | |
20 | */ | |
21 | ||
22 | #define do_div64_32(res, high, low, base) ({ \ | |
7e95a016 | 23 | unsigned long __quot32, __mod32; \ |
1da177e4 LT |
24 | unsigned long __cf, __tmp, __tmp2, __i; \ |
25 | \ | |
26 | __asm__(".set push\n\t" \ | |
27 | ".set noat\n\t" \ | |
28 | ".set noreorder\n\t" \ | |
29 | "move %2, $0\n\t" \ | |
30 | "move %3, $0\n\t" \ | |
31 | "b 1f\n\t" \ | |
32 | " li %4, 0x21\n" \ | |
33 | "0:\n\t" \ | |
34 | "sll $1, %0, 0x1\n\t" \ | |
35 | "srl %3, %0, 0x1f\n\t" \ | |
36 | "or %0, $1, %5\n\t" \ | |
37 | "sll %1, %1, 0x1\n\t" \ | |
38 | "sll %2, %2, 0x1\n" \ | |
39 | "1:\n\t" \ | |
40 | "bnez %3, 2f\n\t" \ | |
41 | " sltu %5, %0, %z6\n\t" \ | |
42 | "bnez %5, 3f\n" \ | |
43 | "2:\n\t" \ | |
44 | " addiu %4, %4, -1\n\t" \ | |
45 | "subu %0, %0, %z6\n\t" \ | |
46 | "addiu %2, %2, 1\n" \ | |
47 | "3:\n\t" \ | |
48 | "bnez %4, 0b\n\t" \ | |
49 | " srl %5, %1, 0x1f\n\t" \ | |
50 | ".set pop" \ | |
7e95a016 AN |
51 | : "=&r" (__mod32), "=&r" (__tmp), \ |
52 | "=&r" (__quot32), "=&r" (__cf), \ | |
1da177e4 LT |
53 | "=&r" (__i), "=&r" (__tmp2) \ |
54 | : "Jr" (base), "0" (high), "1" (low)); \ | |
55 | \ | |
7e95a016 AN |
56 | (res) = __quot32; \ |
57 | __mod32; }) | |
1da177e4 LT |
58 | |
59 | #define do_div(n, base) ({ \ | |
60 | unsigned long long __quot; \ | |
61 | unsigned long __mod; \ | |
62 | unsigned long long __div; \ | |
63 | unsigned long __upper, __low, __high, __base; \ | |
64 | \ | |
65 | __div = (n); \ | |
66 | __base = (base); \ | |
67 | \ | |
68 | __high = __div >> 32; \ | |
69 | __low = __div; \ | |
70 | __upper = __high; \ | |
71 | \ | |
72 | if (__high) \ | |
73 | __asm__("divu $0, %z2, %z3" \ | |
74 | : "=h" (__upper), "=l" (__high) \ | |
75 | : "Jr" (__high), "Jr" (__base) \ | |
76 | : GCC_REG_ACCUM); \ | |
77 | \ | |
78 | __mod = do_div64_32(__low, __upper, __low, __base); \ | |
79 | \ | |
80 | __quot = __high; \ | |
81 | __quot = __quot << 32 | __low; \ | |
82 | (n) = __quot; \ | |
83 | __mod; }) | |
3927f2e8 | 84 | |
1da177e4 LT |
85 | #endif /* (_MIPS_SZLONG == 32) */ |
86 | ||
87 | #if (_MIPS_SZLONG == 64) | |
88 | ||
1da177e4 LT |
89 | /* |
90 | * Hey, we're already 64-bit, no | |
91 | * need to play games.. | |
92 | */ | |
93 | #define do_div(n, base) ({ \ | |
94 | unsigned long __quot; \ | |
95 | unsigned int __mod; \ | |
96 | unsigned long __div; \ | |
97 | unsigned int __base; \ | |
98 | \ | |
99 | __div = (n); \ | |
100 | __base = (base); \ | |
101 | \ | |
102 | __mod = __div % __base; \ | |
103 | __quot = __div / __base; \ | |
104 | \ | |
105 | (n) = __quot; \ | |
106 | __mod; }) | |
107 | ||
108 | #endif /* (_MIPS_SZLONG == 64) */ | |
109 | ||
110 | #endif /* _ASM_DIV64_H */ |