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Diffstat (limited to 'arch/m68k/include/asm/bitops.h')
-rw-r--r--arch/m68k/include/asm/bitops.h58
1 files changed, 58 insertions, 0 deletions
diff --git a/arch/m68k/include/asm/bitops.h b/arch/m68k/include/asm/bitops.h
new file mode 100644
index 0000000000..ad971b4f31
--- /dev/null
+++ b/arch/m68k/include/asm/bitops.h
@@ -0,0 +1,58 @@
+/*
+ * bitops.h: Bit string operations on the m68k
+ */
+
+#ifndef _M68K_BITOPS_H
+#define _M68K_BITOPS_H
+
+#include <linux/config.h>
+#include <asm/byteorder.h>
+
+extern void set_bit(int nr, volatile void *addr);
+extern void clear_bit(int nr, volatile void *addr);
+extern void change_bit(int nr, volatile void *addr);
+extern int test_and_set_bit(int nr, volatile void *addr);
+extern int test_and_clear_bit(int nr, volatile void *addr);
+extern int test_and_change_bit(int nr, volatile void *addr);
+
+#ifdef __KERNEL__
+
+/*
+ * ffs: find first bit set. This is defined the same way as
+ * the libc and compiler builtin ffs routines, therefore
+ * differs in spirit from the above ffz (man ffs).
+ */
+extern __inline__ int ffs(int x)
+{
+ int r = 1;
+
+ if (!x)
+ return 0;
+ if (!(x & 0xffff)) {
+ x >>= 16;
+ r += 16;
+ }
+ if (!(x & 0xff)) {
+ x >>= 8;
+ r += 8;
+ }
+ if (!(x & 0xf)) {
+ x >>= 4;
+ r += 4;
+ }
+ if (!(x & 3)) {
+ x >>= 2;
+ r += 2;
+ }
+ if (!(x & 1)) {
+ x >>= 1;
+ r += 1;
+ }
+ return r;
+}
+#define __ffs(x) (ffs(x) - 1)
+#define PLATFORM_FFS
+
+#endif /* __KERNEL__ */
+
+#endif /* _M68K_BITOPS_H */