| Greg Kroah-Hartman | b244131 | 2017-11-01 15:07:57 +0100 | [diff] [blame] | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
| Greg Ungerer | d20f5aa | 2009-02-06 14:50:08 +1000 | [diff] [blame] | 2 | #ifndef _M68K_DIV64_H |
| 3 | #define _M68K_DIV64_H |
| 4 | |
| Greg Ungerer | 84f3fb7 | 2011-11-11 15:13:08 +1000 | [diff] [blame] | 5 | #ifdef CONFIG_CPU_HAS_NO_MULDIV64 |
| 6 | #include <asm-generic/div64.h> |
| 7 | #else |
| Greg Ungerer | d20f5aa | 2009-02-06 14:50:08 +1000 | [diff] [blame] | 8 | |
| 9 | #include <linux/types.h> |
| 10 | |
| 11 | /* n = n / base; return rem; */ |
| 12 | |
| 13 | #define do_div(n, base) ({ \ |
| 14 | union { \ |
| 15 | unsigned long n32[2]; \ |
| 16 | unsigned long long n64; \ |
| 17 | } __n; \ |
| 18 | unsigned long __rem, __upper; \ |
| Andreas Schwab | ea077b1 | 2013-08-09 15:14:08 +0200 | [diff] [blame] | 19 | unsigned long __base = (base); \ |
| Greg Ungerer | d20f5aa | 2009-02-06 14:50:08 +1000 | [diff] [blame] | 20 | \ |
| 21 | __n.n64 = (n); \ |
| 22 | if ((__upper = __n.n32[0])) { \ |
| 23 | asm ("divul.l %2,%1:%0" \ |
| Andreas Schwab | ea077b1 | 2013-08-09 15:14:08 +0200 | [diff] [blame] | 24 | : "=d" (__n.n32[0]), "=d" (__upper) \ |
| 25 | : "d" (__base), "0" (__n.n32[0])); \ |
| Greg Ungerer | d20f5aa | 2009-02-06 14:50:08 +1000 | [diff] [blame] | 26 | } \ |
| 27 | asm ("divu.l %2,%1:%0" \ |
| Andreas Schwab | ea077b1 | 2013-08-09 15:14:08 +0200 | [diff] [blame] | 28 | : "=d" (__n.n32[1]), "=d" (__rem) \ |
| 29 | : "d" (__base), "1" (__upper), "0" (__n.n32[1])); \ |
| Greg Ungerer | d20f5aa | 2009-02-06 14:50:08 +1000 | [diff] [blame] | 30 | (n) = __n.n64; \ |
| 31 | __rem; \ |
| 32 | }) |
| 33 | |
| Greg Ungerer | 84f3fb7 | 2011-11-11 15:13:08 +1000 | [diff] [blame] | 34 | #endif /* CONFIG_CPU_HAS_NO_MULDIV64 */ |
| Greg Ungerer | d20f5aa | 2009-02-06 14:50:08 +1000 | [diff] [blame] | 35 | |
| 36 | #endif /* _M68K_DIV64_H */ |