| /* SPDX-License-Identifier: GPL-2.0 */ |
| #ifndef _M68K_DIV64_H |
| #define _M68K_DIV64_H |
| |
| #ifdef CONFIG_CPU_HAS_NO_MULDIV64 |
| #include <asm-generic/div64.h> |
| #else |
| |
| #include <linux/types.h> |
| |
| /* n = n / base; return rem; */ |
| |
| #define do_div(n, base) ({ \ |
| union { \ |
| unsigned long n32[2]; \ |
| unsigned long long n64; \ |
| } __n; \ |
| unsigned long __rem, __upper; \ |
| unsigned long __base = (base); \ |
| \ |
| __n.n64 = (n); \ |
| if ((__upper = __n.n32[0])) { \ |
| asm ("divul.l %2,%1:%0" \ |
| : "=d" (__n.n32[0]), "=d" (__upper) \ |
| : "d" (__base), "0" (__n.n32[0])); \ |
| } \ |
| asm ("divu.l %2,%1:%0" \ |
| : "=d" (__n.n32[1]), "=d" (__rem) \ |
| : "d" (__base), "1" (__upper), "0" (__n.n32[1])); \ |
| (n) = __n.n64; \ |
| __rem; \ |
| }) |
| |
| /* defining this stops the unused helper function from being built */ |
| #define __div64_32 __div64_32 |
| |
| #endif /* CONFIG_CPU_HAS_NO_MULDIV64 */ |
| |
| #endif /* _M68K_DIV64_H */ |
