projects / people / ms / u-boot.git / blame
| Commit | Line | Data |
|---|---|---|
| 2281ba51 | 1 | /* |
| a187559e | 2 | * U-Boot - muldi3.c contains routines for mult and div |
| 2281ba51 DH |
3 | * |
| 4 | * | |
| 1a459660 | 5 | * SPDX-License-Identifier: GPL-2.0+ |
| 2281ba51 DH |
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 | } |