1b2441318SGreg Kroah-Hartman /* SPDX-License-Identifier: GPL-2.0 */ 2d20f5aa3SGreg Ungerer #ifndef _M68K_DIV64_H 3d20f5aa3SGreg Ungerer #define _M68K_DIV64_H 4d20f5aa3SGreg Ungerer 584f3fb7aSGreg Ungerer #ifdef CONFIG_CPU_HAS_NO_MULDIV64 684f3fb7aSGreg Ungerer #include <asm-generic/div64.h> 784f3fb7aSGreg Ungerer #else 8d20f5aa3SGreg Ungerer 9d20f5aa3SGreg Ungerer #include <linux/types.h> 10d20f5aa3SGreg Ungerer 11d20f5aa3SGreg Ungerer /* n = n / base; return rem; */ 12d20f5aa3SGreg Ungerer 13d20f5aa3SGreg Ungerer #define do_div(n, base) ({ \ 14d20f5aa3SGreg Ungerer union { \ 15d20f5aa3SGreg Ungerer unsigned long n32[2]; \ 16d20f5aa3SGreg Ungerer unsigned long long n64; \ 17d20f5aa3SGreg Ungerer } __n; \ 18d20f5aa3SGreg Ungerer unsigned long __rem, __upper; \ 19ea077b1bSAndreas Schwab unsigned long __base = (base); \ 20d20f5aa3SGreg Ungerer \ 21d20f5aa3SGreg Ungerer __n.n64 = (n); \ 22d20f5aa3SGreg Ungerer if ((__upper = __n.n32[0])) { \ 23d20f5aa3SGreg Ungerer asm ("divul.l %2,%1:%0" \ 24d20f5aa3SGreg Ungerer : "=d" (__n.n32[0]), "=d" (__upper) \ 25ea077b1bSAndreas Schwab : "d" (__base), "0" (__n.n32[0])); \ 26d20f5aa3SGreg Ungerer } \ 27d20f5aa3SGreg Ungerer asm ("divu.l %2,%1:%0" \ 28d20f5aa3SGreg Ungerer : "=d" (__n.n32[1]), "=d" (__rem) \ 29ea077b1bSAndreas Schwab : "d" (__base), "1" (__upper), "0" (__n.n32[1])); \ 30d20f5aa3SGreg Ungerer (n) = __n.n64; \ 31d20f5aa3SGreg Ungerer __rem; \ 32d20f5aa3SGreg Ungerer }) 33d20f5aa3SGreg Ungerer 34*668a9202SArnd Bergmann /* defining this stops the unused helper function from being built */ 35*668a9202SArnd Bergmann #define __div64_32 __div64_32 36*668a9202SArnd Bergmann 3784f3fb7aSGreg Ungerer #endif /* CONFIG_CPU_HAS_NO_MULDIV64 */ 38d20f5aa3SGreg Ungerer 39d20f5aa3SGreg Ungerer #endif /* _M68K_DIV64_H */ 40