1 // SPDX-License-Identifier: GPL-2.0-or-later <<
2 /* 1 /*
>> 2 * This program is free software; you can redistribute it and/or modify
>> 3 * it under the terms of the GNU General Public License as published by
>> 4 * the Free Software Foundation; either version 2 of the License, or
>> 5 * (at your option) any later version.
>> 6 *
>> 7 * This program is distributed in the hope that it will be useful,
>> 8 * but WITHOUT ANY WARRANTY; without even the implied warranty of
>> 9 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
>> 10 * GNU General Public License for more details.
>> 11 *
>> 12 * You should have received a copy of the GNU General Public License
>> 13 * along with this program; if not, see the file COPYING, or write
>> 14 * to the Free Software Foundation, Inc.
3 */ 15 */
4 16
5 #include <linux/export.h> 17 #include <linux/export.h>
6 #include <linux/libgcc.h> 18 #include <linux/libgcc.h>
7 19
8 #define W_TYPE_SIZE 32 20 #define W_TYPE_SIZE 32
9 21
10 #define __ll_B ((unsigned long) 1 << (W_TYPE_S 22 #define __ll_B ((unsigned long) 1 << (W_TYPE_SIZE / 2))
11 #define __ll_lowpart(t) ((unsigned long) (t) & 23 #define __ll_lowpart(t) ((unsigned long) (t) & (__ll_B - 1))
12 #define __ll_highpart(t) ((unsigned long) (t) 24 #define __ll_highpart(t) ((unsigned long) (t) >> (W_TYPE_SIZE / 2))
13 25
14 /* If we still don't have umul_ppmm, define it 26 /* If we still don't have umul_ppmm, define it using plain C. */
15 #if !defined(umul_ppmm) 27 #if !defined(umul_ppmm)
16 #define umul_ppmm(w1, w0, u, v) 28 #define umul_ppmm(w1, w0, u, v) \
17 do { 29 do { \
18 unsigned long __x0, __x1, __x2 30 unsigned long __x0, __x1, __x2, __x3; \
19 unsigned short __ul, __vl, __u 31 unsigned short __ul, __vl, __uh, __vh; \
20 32 \
21 __ul = __ll_lowpart(u); 33 __ul = __ll_lowpart(u); \
22 __uh = __ll_highpart(u); 34 __uh = __ll_highpart(u); \
23 __vl = __ll_lowpart(v); 35 __vl = __ll_lowpart(v); \
24 __vh = __ll_highpart(v); 36 __vh = __ll_highpart(v); \
25 37 \
26 __x0 = (unsigned long) __ul * 38 __x0 = (unsigned long) __ul * __vl; \
27 __x1 = (unsigned long) __ul * 39 __x1 = (unsigned long) __ul * __vh; \
28 __x2 = (unsigned long) __uh * 40 __x2 = (unsigned long) __uh * __vl; \
29 __x3 = (unsigned long) __uh * 41 __x3 = (unsigned long) __uh * __vh; \
30 42 \
31 __x1 += __ll_highpart(__x0); / 43 __x1 += __ll_highpart(__x0); /* this can't give carry */\
32 __x1 += __x2; /* but this inde 44 __x1 += __x2; /* but this indeed can */ \
33 if (__x1 < __x2) /* did we get 45 if (__x1 < __x2) /* did we get it? */ \
34 __x3 += __ll_B; /* yes, add it 46 __x3 += __ll_B; /* yes, add it in the proper pos */ \
35 47 \
36 (w1) = __x3 + __ll_highpart(__ 48 (w1) = __x3 + __ll_highpart(__x1); \
37 (w0) = __ll_lowpart(__x1) * __ 49 (w0) = __ll_lowpart(__x1) * __ll_B + __ll_lowpart(__x0);\
38 } while (0) 50 } while (0)
39 #endif 51 #endif
40 52
41 #if !defined(__umulsidi3) 53 #if !defined(__umulsidi3)
42 #define __umulsidi3(u, v) ({ 54 #define __umulsidi3(u, v) ({ \
43 DWunion __w; 55 DWunion __w; \
44 umul_ppmm(__w.s.high, __w.s.low, u, v) 56 umul_ppmm(__w.s.high, __w.s.low, u, v); \
45 __w.ll; 57 __w.ll; \
46 }) 58 })
47 #endif 59 #endif
48 60
49 long long notrace __muldi3(long long u, long l 61 long long notrace __muldi3(long long u, long long v)
50 { 62 {
51 const DWunion uu = {.ll = u}; 63 const DWunion uu = {.ll = u};
52 const DWunion vv = {.ll = v}; 64 const DWunion vv = {.ll = v};
53 DWunion w = {.ll = __umulsidi3(uu.s.lo 65 DWunion w = {.ll = __umulsidi3(uu.s.low, vv.s.low)};
54 66
55 w.s.high += ((unsigned long) uu.s.low 67 w.s.high += ((unsigned long) uu.s.low * (unsigned long) vv.s.high
56 + (unsigned long) uu.s.high * 68 + (unsigned long) uu.s.high * (unsigned long) vv.s.low);
57 69
58 return w.ll; 70 return w.ll;
59 } 71 }
60 EXPORT_SYMBOL(__muldi3); 72 EXPORT_SYMBOL(__muldi3);
61 73
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