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linuxkpi: math.h: Add mul_u64_u32_div and mul_u64_u32_shr

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Needed by drm-kmod.

Reviewed by:	hselasky
Obtained from:	OpenBSD
Sponsored by:	Beckhoff Automation GmbH & Co. KG
Differential Revision:	https://reviews.freebsd.org/D35937
This commit is contained in:
Emmanuel Vadot 2022-07-26 10:06:56 +02:00
parent 6be89cc88d
commit 885ab0dba2
1 changed files with 19 additions and 0 deletions
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19
sys/compat/linuxkpi/common/include/linux/math64.h
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@ -100,4 +100,23 @@ div64_u64_round_up(uint64_t dividend, uint64_t divisor)
#define DIV64_U64_ROUND_UP(...) \
div64_u64_round_up(__VA_ARGS__)
static inline uint64_t
mul_u64_u32_div(uint64_t x, uint32_t y, uint32_t div)
{
const uint64_t rem = x % div;
return ((x / div) * y + (rem * y) / div);
}
static inline uint64_t
mul_u64_u32_shr(uint64_t x, uint32_t y, unsigned int shift)
{
uint32_t hi, lo;
hi = x >> 32;
lo = x & 0xffffffff;
return (mul_u32_u32(lo, y) >> shift) +
(mul_u32_u32(hi, y) << (32 - shift));
}
#endif /* _LINUXKPI_LINUX_MATH64_H */