cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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math64.h (1246B)

      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__
      8static 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__
     22static 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__
     30static 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
     40static inline u64 mul_u32_u32(u32 a, u32 b)
     41{
     42	return (u64)a * b;
     43}
     44#endif
     45
     46static 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
     64static 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 */