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