// SPDX-License-Identifier: GPL-2.0-or-later/* */ #include <linux/export.h>#include <linux/libgcc.h> #define W_TYPE_SIZE 32 #define __ll_B ((unsigned long) 1 << (W_TYPE_SIZE / 2))#define __ll_lowpart(t) ((unsigned long) (t) & (__ll_B - 1))#define __ll_highpart(t) ((unsigned long) (t) >> (W_TYPE_SIZE / 2)) /* If we still don't have umul_ppmm, define it using plain C.  */#if !defined(umul_ppmm)#define umul_ppmm(w1, w0, u, v)						\	do {								\		unsigned long __x0, __x1, __x2, __x3;			\		unsigned short __ul, __vl, __uh, __vh;			\									\		__ul = __ll_lowpart(u);					\		__uh = __ll_highpart(u);				\		__vl = __ll_lowpart(v);					\		__vh = __ll_highpart(v);				\									\		__x0 = (unsigned long) __ul * __vl;			\		__x1 = (unsigned long) __ul * __vh;			\		__x2 = (unsigned long) __uh * __vl;			\		__x3 = (unsigned long) __uh * __vh;			\									\		__x1 += __ll_highpart(__x0); /* this can't give carry */\		__x1 += __x2; /* but this indeed can */			\		if (__x1 < __x2) /* did we get it? */			\		__x3 += __ll_B; /* yes, add it in the proper pos */	\									\		(w1) = __x3 + __ll_highpart(__x1);			\		(w0) = __ll_lowpart(__x1) * __ll_B + __ll_lowpart(__x0);\	} while (0)#endif #if !defined(__umulsidi3)#define __umulsidi3(u, v) ({				\	DWunion __w;					\	umul_ppmm(__w.s.high, __w.s.low, u, v);		\	__w.ll;						\	})#endif long long notrace __muldi3(long long u, long long v){	const DWunion uu = {.ll = u};	const DWunion vv = {.ll = v};	DWunion w = {.ll = __umulsidi3(uu.s.low, vv.s.low)}; 	w.s.high += ((unsigned long) uu.s.low * (unsigned long) vv.s.high		+ (unsigned long) uu.s.high * (unsigned long) vv.s.low); 	return w.ll;}EXPORT_SYMBOL(__muldi3);