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