linux/arch/x86/include/asm/div64.h

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _ASM_X86_DIV64_H
#define _ASM_X86_DIV64_H

#ifdef CONFIG_X86_32

#include <linux/types.h>
#include <linux/log2.h>

/*
 * do_div() is NOT a C function. It wants to return
 * two values (the quotient and the remainder), but
 * since that doesn't work very well in C, what it
 * does is:
 *
 * - modifies the 64-bit dividend _in_place_
 * - returns the 32-bit remainder
 *
 * This ends up being the most efficient "calling
 * convention" on x86.
 */
#define do_div …

static inline u64 div_u64_rem(u64 dividend, u32 divisor, u32 *remainder)
{
	union {
		u64 v64;
		u32 v32[2];
	} d = { dividend };
	u32 upper;

	upper = d.v32[1];
	d.v32[1] = 0;
	if (upper >= divisor) {
		d.v32[1] = upper / divisor;
		upper %= divisor;
	}
	asm ("divl %2" : "=a" (d.v32[0]), "=d" (*remainder) :
		"rm" (divisor), "0" (d.v32[0]), "1" (upper));
	return d.v64;
}
#define div_u64_rem …

static inline u64 mul_u32_u32(u32 a, u32 b)
{
	u32 high, low;

	asm ("mull %[b]" : "=a" (low), "=d" (high)
			 : [a] "a" (a), [b] "rm" (b) );

	return low | ((u64)high) << 32;
}
#define mul_u32_u32 …

/*
 * __div64_32() is never called on x86, so prevent the
 * generic definition from getting built.
 */
#define __div64_32

#else
# include <asm-generic/div64.h>

/*
 * Will generate an #DE when the result doesn't fit u64, could fix with an
 * __ex_table[] entry when it becomes an issue.
 */
static inline u64 mul_u64_u64_div_u64(u64 a, u64 mul, u64 div)
{ … }
#define mul_u64_u64_div_u64 …

static inline u64 mul_u64_u32_div(u64 a, u32 mul, u32 div)
{ … }
#define mul_u64_u32_div …

#endif /* CONFIG_X86_32 */

#endif /* _ASM_X86_DIV64_H */