blob: da55711dd7451f405f5370ea14ad60e8641fc792 [file] [log] [blame]
Wolfgang Denk6cb142f2006-03-12 02:12:27 +01001/*
2 * U-boot - muldi3.c contains routines for mult and div
3 *
4 * Copyright (c) 2005 blackfin.uclinux.org
5 *
6 * See file CREDITS for list of people who contributed to this
7 * project.
8 *
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License as
11 * published by the Free Software Foundation; either version 2 of
12 * the License, or (at your option) any later version.
13 *
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
18 *
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
22 * MA 02111-1307 USA
23 */
24
25/* Generic function got from GNU gcc package, libgcc2.c */
26#ifndef SI_TYPE_SIZE
27#define SI_TYPE_SIZE 32
28#endif
29#define __ll_B (1L << (SI_TYPE_SIZE / 2))
30#define __ll_lowpart(t) ((USItype) (t) % __ll_B)
31#define __ll_highpart(t) ((USItype) (t) / __ll_B)
32#define BITS_PER_UNIT 8
33
34#if !defined (umul_ppmm)
35#define umul_ppmm(w1, w0, u, v) \
36do { \
37 USItype __x0, __x1, __x2, __x3; \
38 USItype __ul, __vl, __uh, __vh; \
39 \
40 __ul = __ll_lowpart (u); \
41 __uh = __ll_highpart (u); \
42 __vl = __ll_lowpart (v); \
43 __vh = __ll_highpart (v); \
44 \
45 __x0 = (USItype) __ul * __vl; \
46 __x1 = (USItype) __ul * __vh; \
47 __x2 = (USItype) __uh * __vl; \
48 __x3 = (USItype) __uh * __vh; \
49 \
50 __x1 += __ll_highpart (__x0);/* this can't give carry */ \
51 __x1 += __x2; /* but this indeed can */ \
52 if (__x1 < __x2) /* did we get it? */ \
53 __x3 += __ll_B; /* yes, add it in the proper pos. */ \
54 \
55 (w1) = __x3 + __ll_highpart (__x1); \
56 (w0) = __ll_lowpart (__x1) * __ll_B + __ll_lowpart (__x0); \
57} while (0)
58#endif
59
60#if !defined (__umulsidi3)
61#define __umulsidi3(u, v) \
62 ({DIunion __w; \
63 umul_ppmm (__w.s.high, __w.s.low, u, v); \
64 __w.ll; })
65#endif
66
Aubrey.Li3f0606a2007-03-09 13:38:44 +080067typedef unsigned int USItype __attribute__ ((mode(SI)));
68typedef int SItype __attribute__ ((mode(SI)));
69typedef int DItype __attribute__ ((mode(DI)));
70typedef int word_type __attribute__ ((mode(__word__)));
Wolfgang Denk6cb142f2006-03-12 02:12:27 +010071
Aubrey.Li3f0606a2007-03-09 13:38:44 +080072struct DIstruct {
73 SItype low, high;
74};
75typedef union {
Wolfgang Denk6cb142f2006-03-12 02:12:27 +010076 struct DIstruct s;
77 DItype ll;
78} DIunion;
79
Aubrey.Li3f0606a2007-03-09 13:38:44 +080080DItype __muldi3(DItype u, DItype v)
Wolfgang Denk6cb142f2006-03-12 02:12:27 +010081{
82 DIunion w;
83 DIunion uu, vv;
Wolfgang Denk8e7b7032006-03-12 02:55:22 +010084
Aubrey.Li3f0606a2007-03-09 13:38:44 +080085 uu.ll = u, vv.ll = v;
Wolfgang Denk6cb142f2006-03-12 02:12:27 +010086 /* panic("kernel panic for __muldi3"); */
Aubrey.Li3f0606a2007-03-09 13:38:44 +080087 w.ll = __umulsidi3(uu.s.low, vv.s.low);
Wolfgang Denk6cb142f2006-03-12 02:12:27 +010088 w.s.high += ((USItype) uu.s.low * (USItype) vv.s.high
Aubrey.Li3f0606a2007-03-09 13:38:44 +080089 + (USItype) uu.s.high * (USItype) vv.s.low);
Wolfgang Denk8e7b7032006-03-12 02:55:22 +010090
Wolfgang Denk6cb142f2006-03-12 02:12:27 +010091 return w.ll;
92}