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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-11 08:27:49 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-11 08:27:49 +0000
commitace9429bb58fd418f0c81d4c2835699bddf6bde6 (patch)
treeb2d64bc10158fdd5497876388cd68142ca374ed3 /arch/m68k/include/asm/div64.h
parentInitial commit. (diff)
downloadlinux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.tar.xz
linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.zip
Adding upstream version 6.6.15.upstream/6.6.15
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'arch/m68k/include/asm/div64.h')
-rw-r--r--arch/m68k/include/asm/div64.h39
1 files changed, 39 insertions, 0 deletions
diff --git a/arch/m68k/include/asm/div64.h b/arch/m68k/include/asm/div64.h
new file mode 100644
index 0000000000..df1f6b450c
--- /dev/null
+++ b/arch/m68k/include/asm/div64.h
@@ -0,0 +1,39 @@
+/* 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 */