1 /* 2 * U-boot - muldi3.c contains routines for mult and div 3 * 4 * 5 * SPDX-License-Identifier: GPL-2.0+ 6 */ 7 8 /* Generic function got from GNU gcc package, libgcc2.c */ 9 #ifndef SI_TYPE_SIZE 10 #define SI_TYPE_SIZE 32 11 #endif 12 #define __ll_B (1L << (SI_TYPE_SIZE / 2)) 13 #define __ll_lowpart(t) ((USItype) (t) % __ll_B) 14 #define __ll_highpart(t) ((USItype) (t) / __ll_B) 15 #define BITS_PER_UNIT 8 16 17 #if !defined(umul_ppmm) 18 #define umul_ppmm(w1, w0, u, v) \ 19 do { \ 20 USItype __x0, __x1, __x2, __x3; \ 21 USItype __ul, __vl, __uh, __vh; \ 22 \ 23 __ul = __ll_lowpart(u); \ 24 __uh = __ll_highpart(u); \ 25 __vl = __ll_lowpart(v); \ 26 __vh = __ll_highpart(v); \ 27 \ 28 __x0 = (USItype) __ul * __vl; \ 29 __x1 = (USItype) __ul * __vh; \ 30 __x2 = (USItype) __uh * __vl; \ 31 __x3 = (USItype) __uh * __vh; \ 32 \ 33 __x1 += __ll_highpart(__x0); /* this can't give carry */\ 34 __x1 += __x2; /* but this indeed can */ \ 35 if (__x1 < __x2) /* did we get it? */ \ 36 __x3 += __ll_B; /* yes, add it in the proper pos. */ \ 37 \ 38 (w1) = __x3 + __ll_highpart(__x1); \ 39 (w0) = __ll_lowpart(__x1) * __ll_B + __ll_lowpart(__x0);\ 40 } while (0) 41 #endif 42 43 #if !defined(__umulsidi3) 44 #define __umulsidi3(u, v) \ 45 ({DIunion __w; \ 46 umul_ppmm(__w.s.high, __w.s.low, u, v); \ 47 __w.ll; }) 48 #endif 49 50 typedef unsigned int USItype __attribute__ ((mode(SI))); 51 typedef int SItype __attribute__ ((mode(SI))); 52 typedef int DItype __attribute__ ((mode(DI))); 53 typedef int word_type __attribute__ ((mode(__word__))); 54 55 struct DIstruct { 56 SItype low, high; 57 }; 58 typedef union { 59 struct DIstruct s; 60 DItype ll; 61 } DIunion; 62 63 DItype __muldi3(DItype u, DItype v) 64 { 65 DIunion w; 66 DIunion uu, vv; 67 68 uu.ll = u, vv.ll = v; 69 /* panic("kernel panic for __muldi3"); */ 70 w.ll = __umulsidi3(uu.s.low, vv.s.low); 71 w.s.high += ((USItype) uu.s.low * (USItype) vv.s.high 72 + (USItype) uu.s.high * (USItype) vv.s.low); 73 74 return w.ll; 75 } 76