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| -rw-r--r-- | tools/include/linux/math64.h | 75 |
1 files changed, 75 insertions, 0 deletions
diff --git a/tools/include/linux/math64.h b/tools/include/linux/math64.h new file mode 100644 index 000000000000..4ad45d5943dc --- /dev/null +++ b/tools/include/linux/math64.h @@ -0,0 +1,75 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef _LINUX_MATH64_H +#define _LINUX_MATH64_H + +#include <linux/types.h> + +#ifdef __x86_64__ +static inline u64 mul_u64_u64_div64(u64 a, u64 b, u64 c) +{ + u64 q; + + asm ("mulq %2; divq %3" : "=a" (q) + : "a" (a), "rm" (b), "rm" (c) + : "rdx"); + + return q; +} +#define mul_u64_u64_div64 mul_u64_u64_div64 +#endif + +#ifdef __SIZEOF_INT128__ +static inline u64 mul_u64_u32_shr(u64 a, u32 b, unsigned int shift) +{ + return (u64)(((unsigned __int128)a * b) >> shift); +} + +#else + +#ifdef __i386__ +static inline u64 mul_u32_u32(u32 a, u32 b) +{ + u32 high, low; + + asm ("mull %[b]" : "=a" (low), "=d" (high) + : [a] "a" (a), [b] "rm" (b) ); + + return low | ((u64)high) << 32; +} +#else +static inline u64 mul_u32_u32(u32 a, u32 b) +{ + return (u64)a * b; +} +#endif + +static inline u64 mul_u64_u32_shr(u64 a, u32 b, unsigned int shift) +{ + u32 ah, al; + u64 ret; + + al = a; + ah = a >> 32; + + ret = mul_u32_u32(al, b) >> shift; + if (ah) + ret += mul_u32_u32(ah, b) << (32 - shift); + + return ret; +} + +#endif /* __SIZEOF_INT128__ */ + +#ifndef mul_u64_u64_div64 +static inline u64 mul_u64_u64_div64(u64 a, u64 b, u64 c) +{ + u64 quot, rem; + + quot = a / c; + rem = a % c; + + return quot * b + (rem * b) / c; +} +#endif + +#endif /* _LINUX_MATH64_H */ |