1 /*
2 * U-boot - muldi3.c contains routines for mult and div
3 *
4 * Copyright (c) 2005-2007 Analog Devices Inc.
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., 51 Franklin St, Fifth Floor, Boston,
22 * MA 02110-1301 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) \
36 do { \
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
67 typedef unsigned int USItype __attribute__ ((mode(SI)));
68 typedef int SItype __attribute__ ((mode(SI)));
69 typedef int DItype __attribute__ ((mode(DI)));
70 typedef int word_type __attribute__ ((mode(__word__)));
71
72 struct DIstruct {
73 SItype low, high;
74 };
75 typedef union {
76 struct DIstruct s;
77 DItype ll;
78 } DIunion;
79
__muldi3(DItype u,DItype v)80 DItype __muldi3(DItype u, DItype v)
81 {
82 DIunion w;
83 DIunion uu, vv;
84
85 uu.ll = u, vv.ll = v;
86 /* panic("kernel panic for __muldi3"); */
87 w.ll = __umulsidi3(uu.s.low, vv.s.low);
88 w.s.high += ((USItype) uu.s.low * (USItype) vv.s.high
89 + (USItype) uu.s.high * (USItype) vv.s.low);
90
91 return w.ll;
92 }
93