unicore32 additional architecture files: low-level lib: misc

This patch implements the rest low-level libraries.

Signed-off-by: Guan Xuetao <gxt@mprc.pku.edu.cn>
Acked-by: Arnd Bergmann <arnd@arndb.de>

1 files changed, 47 insertions, 0 deletions

diff --git a/arch/unicore32/include/asm/bitops.h b/arch/unicore32/include/asm/bitops.h
new file mode 100644
index 000000000000..1628a6328994
--- /dev/null
+++ b/arch/unicore32/include/asm/bitops.h
@@ -0,0 +1,47 @@
+/*
+ * linux/arch/unicore32/include/asm/bitops.h
+ *
+ * Code specific to PKUnity SoC and UniCore ISA
+ *
+ * Copyright (C) 2001-2010 GUAN Xue-tao
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#ifndef __UNICORE_BITOPS_H__
+#define __UNICORE_BITOPS_H__
+
+#define find_next_bit		__uc32_find_next_bit
+#define find_next_zero_bit	__uc32_find_next_zero_bit
+
+#define find_first_bit		__uc32_find_first_bit
+#define find_first_zero_bit	__uc32_find_first_zero_bit
+
+#define _ASM_GENERIC_BITOPS_FLS_H_
+#define _ASM_GENERIC_BITOPS___FLS_H_
+#define _ASM_GENERIC_BITOPS_FFS_H_
+#define _ASM_GENERIC_BITOPS___FFS_H_
+/*
+ * On UNICORE, those functions can be implemented around
+ * the cntlz instruction for much better code efficiency.
+ */
+
+static inline int fls(int x)
+{
+	int ret;
+
+	asm("cntlz\t%0, %1" : "=r" (ret) : "r" (x) : "cc");
+	ret = 32 - ret;
+
+	return ret;
+}
+
+#define __fls(x) (fls(x) - 1)
+#define ffs(x) ({ unsigned long __t = (x); fls(__t & -__t); })
+#define __ffs(x) (ffs(x) - 1)
+
+#include <asm-generic/bitops.h>
+
+#endif /* __UNICORE_BITOPS_H__ */