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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div64.h (858B)

      1/* SPDX-License-Identifier: GPL-2.0 */
      2#ifndef _M68K_DIV64_H
      3#define _M68K_DIV64_H
      4
      5#ifdef CONFIG_CPU_HAS_NO_MULDIV64
      6#include <asm-generic/div64.h>
      7#else
      8
      9#include <linux/types.h>
     10
     11/* n = n / base; return rem; */
     12
     13#define do_div(n, base) ({					\
     14	union {							\
     15		unsigned long n32[2];				\
     16		unsigned long long n64;				\
     17	} __n;							\
     18	unsigned long __rem, __upper;				\
     19	unsigned long __base = (base);				\
     20								\
     21	__n.n64 = (n);						\
     22	if ((__upper = __n.n32[0])) {				\
     23		asm ("divul.l %2,%1:%0"				\
     24		     : "=d" (__n.n32[0]), "=d" (__upper)	\
     25		     : "d" (__base), "0" (__n.n32[0]));		\
     26	}							\
     27	asm ("divu.l %2,%1:%0"					\
     28	     : "=d" (__n.n32[1]), "=d" (__rem)			\
     29	     : "d" (__base), "1" (__upper), "0" (__n.n32[1]));	\
     30	(n) = __n.n64;						\
     31	__rem;							\
     32})
     33
     34#endif /* CONFIG_CPU_HAS_NO_MULDIV64 */
     35
     36#endif /* _M68K_DIV64_H */