projects / linux-2.6-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 2fc83c2c RH |
1 | /* SPDX-License-Identifier: GPL-2.0 */ |
| 2 | #ifndef _LINUX_MATH64_H | |
| 3 | #define _LINUX_MATH64_H | |
| 4 | ||
| 5 | #include <linux/types.h> | |
| 6 | ||
| 7 | #ifdef __x86_64__ | |
| 8 | static inline u64 mul_u64_u64_div64(u64 a, u64 b, u64 c) | |
| 9 | { | |
| 10 | u64 q; | |
| 11 | ||
| 12 | asm ("mulq %2; divq %3" : "=a" (q) | |
| 13 | : "a" (a), "rm" (b), "rm" (c) | |
| 14 | : "rdx"); | |
| 15 | ||
| 16 | return q; | |
| 17 | } | |
| 18 | #define mul_u64_u64_div64 mul_u64_u64_div64 | |
| 19 | #endif | |
| 20 | ||
| 21 | #ifdef __SIZEOF_INT128__ | |
| 22 | static inline u64 mul_u64_u32_shr(u64 a, u32 b, unsigned int shift) | |
| 23 | { | |
| 24 | return (u64)(((unsigned __int128)a * b) >> shift); | |
| 25 | } | |
| 26 | ||
| 27 | #else | |
| 28 | ||
| 29 | #ifdef __i386__ | |
| 30 | static inline u64 mul_u32_u32(u32 a, u32 b) | |
| 31 | { | |
| 32 | u32 high, low; | |
| 33 | ||
| 34 | asm ("mull %[b]" : "=a" (low), "=d" (high) | |
| 35 | : [a] "a" (a), [b] "rm" (b) ); | |
| 36 | ||
| 37 | return low | ((u64)high) << 32; | |
| 38 | } | |
| 39 | #else | |
| 40 | static inline u64 mul_u32_u32(u32 a, u32 b) | |
| 41 | { | |
| 42 | return (u64)a * b; | |
| 43 | } | |
| 44 | #endif | |
| 45 | ||
| 46 | static inline u64 mul_u64_u32_shr(u64 a, u32 b, unsigned int shift) | |
| 47 | { | |
| 48 | u32 ah, al; | |
| 49 | u64 ret; | |
| 50 | ||
| 51 | al = a; | |
| 52 | ah = a >> 32; | |
| 53 | ||
| 54 | ret = mul_u32_u32(al, b) >> shift; | |
| 55 | if (ah) | |
| 56 | ret += mul_u32_u32(ah, b) << (32 - shift); | |
| 57 | ||
| 58 | return ret; | |
| 59 | } | |
| 60 | ||
| 61 | #endif /* __SIZEOF_INT128__ */ | |
| 62 | ||
| 63 | #ifndef mul_u64_u64_div64 | |
| 64 | static inline u64 mul_u64_u64_div64(u64 a, u64 b, u64 c) | |
| 65 | { | |
| 66 | u64 quot, rem; | |
| 67 | ||
| 68 | quot = a / c; | |
| 69 | rem = a % c; | |
| 70 | ||
| 71 | return quot * b + (rem * b) / c; | |
| 72 | } | |
| 73 | #endif | |
| 74 | ||
| 75 | #endif /* _LINUX_MATH64_H */ |