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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 | */ | |
c21004cd RB |
9 | #ifndef __ASM_DIV64_H |
10 | #define __ASM_DIV64_H | |
1da177e4 | 11 | |
c21004cd | 12 | #include <asm-generic/div64.h> |
3927f2e8 | 13 | |
c21004cd | 14 | #if BITS_PER_LONG == 64 |
1da177e4 | 15 | |
c21004cd | 16 | #include <linux/types.h> |
1da177e4 LT |
17 | |
18 | /* | |
19 | * No traps on overflows for any of these... | |
20 | */ | |
21 | ||
c21004cd RB |
22 | #define __div64_32(n, base) \ |
23 | ({ \ | |
24 | unsigned long __cf, __tmp, __tmp2, __i; \ | |
25 | unsigned long __quot32, __mod32; \ | |
26 | unsigned long __high, __low; \ | |
27 | unsigned long long __n; \ | |
28 | \ | |
29 | __high = *__n >> 32; \ | |
30 | __low = __n; \ | |
31 | __asm__( \ | |
32 | " .set push \n" \ | |
33 | " .set noat \n" \ | |
34 | " .set noreorder \n" \ | |
35 | " move %2, $0 \n" \ | |
36 | " move %3, $0 \n" \ | |
37 | " b 1f \n" \ | |
38 | " li %4, 0x21 \n" \ | |
39 | "0: \n" \ | |
40 | " sll $1, %0, 0x1 \n" \ | |
41 | " srl %3, %0, 0x1f \n" \ | |
42 | " or %0, $1, %5 \n" \ | |
43 | " sll %1, %1, 0x1 \n" \ | |
44 | " sll %2, %2, 0x1 \n" \ | |
45 | "1: \n" \ | |
46 | " bnez %3, 2f \n" \ | |
47 | " sltu %5, %0, %z6 \n" \ | |
48 | " bnez %5, 3f \n" \ | |
49 | "2: \n" \ | |
50 | " addiu %4, %4, -1 \n" \ | |
51 | " subu %0, %0, %z6 \n" \ | |
52 | " addiu %2, %2, 1 \n" \ | |
53 | "3: \n" \ | |
54 | " bnez %4, 0b\n\t" \ | |
55 | " srl %5, %1, 0x1f\n\t" \ | |
56 | " .set pop" \ | |
57 | : "=&r" (__mod32), "=&r" (__tmp), \ | |
58 | "=&r" (__quot32), "=&r" (__cf), \ | |
59 | "=&r" (__i), "=&r" (__tmp2) \ | |
60 | : "Jr" (base), "0" (__high), "1" (__low)); \ | |
61 | \ | |
62 | (__n) = __quot32; \ | |
63 | __mod32; \ | |
64 | }) | |
1da177e4 | 65 | |
c21004cd | 66 | #endif /* BITS_PER_LONG == 64 */ |
1da177e4 | 67 | |
c21004cd | 68 | #endif /* __ASM_DIV64_H */ |