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https://github.com/AsahiLinux/u-boot
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83d290c56f
When U-Boot started using SPDX tags we were among the early adopters and there weren't a lot of other examples to borrow from. So we picked the area of the file that usually had a full license text and replaced it with an appropriate SPDX-License-Identifier: entry. Since then, the Linux Kernel has adopted SPDX tags and they place it as the very first line in a file (except where shebangs are used, then it's second line) and with slightly different comment styles than us. In part due to community overlap, in part due to better tag visibility and in part for other minor reasons, switch over to that style. This commit changes all instances where we have a single declared license in the tag as both the before and after are identical in tag contents. There's also a few places where I found we did not have a tag and have introduced one. Signed-off-by: Tom Rini <trini@konsulko.com>
74 lines
1.9 KiB
C
74 lines
1.9 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* U-Boot - muldi3.c contains routines for mult and div
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*
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*/
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/* Generic function got from GNU gcc package, libgcc2.c */
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#ifndef SI_TYPE_SIZE
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#define SI_TYPE_SIZE 32
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#endif
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#define __ll_B (1L << (SI_TYPE_SIZE / 2))
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#define __ll_lowpart(t) ((USItype) (t) % __ll_B)
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#define __ll_highpart(t) ((USItype) (t) / __ll_B)
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#define BITS_PER_UNIT 8
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#if !defined(umul_ppmm)
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#define umul_ppmm(w1, w0, u, v) \
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do { \
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USItype __x0, __x1, __x2, __x3; \
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USItype __ul, __vl, __uh, __vh; \
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\
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__ul = __ll_lowpart(u); \
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__uh = __ll_highpart(u); \
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__vl = __ll_lowpart(v); \
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__vh = __ll_highpart(v); \
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\
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__x0 = (USItype) __ul * __vl; \
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__x1 = (USItype) __ul * __vh; \
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__x2 = (USItype) __uh * __vl; \
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__x3 = (USItype) __uh * __vh; \
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\
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__x1 += __ll_highpart(__x0); /* this can't give carry */\
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__x1 += __x2; /* but this indeed can */ \
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if (__x1 < __x2) /* did we get it? */ \
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__x3 += __ll_B; /* yes, add it in the proper pos. */ \
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\
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(w1) = __x3 + __ll_highpart(__x1); \
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(w0) = __ll_lowpart(__x1) * __ll_B + __ll_lowpart(__x0);\
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} while (0)
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#endif
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#if !defined(__umulsidi3)
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#define __umulsidi3(u, v) \
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({DIunion __w; \
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umul_ppmm(__w.s.high, __w.s.low, u, v); \
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__w.ll; })
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#endif
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typedef unsigned int USItype __attribute__ ((mode(SI)));
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typedef int SItype __attribute__ ((mode(SI)));
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typedef int DItype __attribute__ ((mode(DI)));
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typedef int word_type __attribute__ ((mode(__word__)));
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struct DIstruct {
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SItype low, high;
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};
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typedef union {
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struct DIstruct s;
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DItype ll;
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} DIunion;
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DItype __muldi3(DItype u, DItype v)
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{
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DIunion w;
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DIunion uu, vv;
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uu.ll = u, vv.ll = v;
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/* panic("kernel panic for __muldi3"); */
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w.ll = __umulsidi3(uu.s.low, vv.s.low);
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w.s.high += ((USItype) uu.s.low * (USItype) vv.s.high
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+ (USItype) uu.s.high * (USItype) vv.s.low);
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return w.ll;
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}
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