| /* |

| * This program is free software; you can redistribute it and/or modify |

| * it under the terms of the GNU General Public License as published by |

| * the Free Software Foundation; either version 2 of the License, or |

| * (at your option) any later version. |

| * |

| * This program is distributed in the hope that it will be useful, |

| * but WITHOUT ANY WARRANTY; without even the implied warranty of |

| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |

| * GNU General Public License for more details. |

| * |

| * You should have received a copy of the GNU General Public License |

| * along with this program; if not, see the file COPYING, or write |

| * to the Free Software Foundation, Inc. |

| */ |

| |

| #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); |