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| 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 | static inline u64 div_u64(u64 dividend, u32 divisor) |
| 76 | { |
| 77 | return dividend / divisor; |
| 78 | } |
| 79 | |
| 80 | #endif /* _LINUX_MATH64_H */ |
| 81 |
Warning: That file was not part of the compilation database. It may have many parsing errors.