[PATCH v2 11/15] xen/asm-generic: introduce generic div64.h header

[Oleksii Kurochko <oleksii.kurochko@xxxxxxxxx>]

All archs have the do_div implementation for BITS_PER_LONG == 64
so do_div64.h is moved to asm-generic.

The patch introduces header stub necessry for full Xen build.

Signed-off-by: Oleksii Kurochko <oleksii.kurochko@xxxxxxxxx>
---
Changes in V2:
        - rename base to divisor
        - add "#if BITS_PER_LONG == 64"
        - fix code style
---
 xen/include/asm-generic/div64.h | 27 +++++++++++++++++++++++++++
 1 file changed, 27 insertions(+)
 create mode 100644 xen/include/asm-generic/div64.h

diff --git a/xen/include/asm-generic/div64.h b/xen/include/asm-generic/div64.h
new file mode 100644
index 0000000000..068d8a11ad
--- /dev/null
+++ b/xen/include/asm-generic/div64.h
@@ -0,0 +1,27 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+#ifndef __ASM_GENERIC_DIV64
+#define __ASM_GENERIC_DIV64
+
+#include <xen/types.h>
+
+#if BITS_PER_LONG == 64
+
+#define do_div(n, divisor) ({                   \
+    uint32_t divisor_ = (divisor);              \
+    uint32_t rem_ = (uint64_t)(n) % divisor_;   \
+    (n) = (uint64_t)(n) / divisor_;             \
+    rem_;                                       \
+})
+
+#endif /* BITS_PER_LONG */
+
+#endif
+
+/*
+ * Local variables:
+ * mode: C
+ * c-file-style: "BSD"
+ * c-basic-offset: 4
+ * indent-tabs-mode: nil
+ * End:
+ */
-- 
2.41.0