1 files changed, 81 insertions, 0 deletions

diff --git a/include/asm-generic/bitops.h b/include/asm-generic/bitops.h
new file mode 100644
index 000000000000..ce31b739fd80
--- /dev/null
+++ b/include/asm-generic/bitops.h
@@ -0,0 +1,81 @@
+#ifndef _ASM_GENERIC_BITOPS_H_
+#define _ASM_GENERIC_BITOPS_H_
+
+/*
+ * For the benefit of those who are trying to port Linux to another
+ * architecture, here are some C-language equivalents.  You should
+ * recode these in the native assembly language, if at all possible.
+ * To guarantee atomicity, these routines call cli() and sti() to
+ * disable interrupts while they operate.  (You have to provide inline
+ * routines to cli() and sti().)
+ *
+ * Also note, these routines assume that you have 32 bit longs.
+ * You will have to change this if you are trying to port Linux to the
+ * Alpha architecture or to a Cray.  :-)
+ * 
+ * C language equivalents written by Theodore Ts'o, 9/26/92
+ */
+
+extern __inline__ int set_bit(int nr,long * addr)
+{
+        int     mask, retval;
+
+        addr += nr >> 5;
+        mask = 1 << (nr & 0x1f);
+        cli();
+        retval = (mask & *addr) != 0;
+        *addr |= mask;
+        sti();
+        return retval;
+}
+
+extern __inline__ int clear_bit(int nr, long * addr)
+{
+        int     mask, retval;
+
+        addr += nr >> 5;
+        mask = 1 << (nr & 0x1f);
+        cli();
+        retval = (mask & *addr) != 0;
+        *addr &= ~mask;
+        sti();
+        return retval;
+}
+
+extern __inline__ int test_bit(int nr, const unsigned long * addr)
+{
+        int     mask;
+
+        addr += nr >> 5;
+        mask = 1 << (nr & 0x1f);
+        return ((mask & *addr) != 0);
+}
+
+/*
+ * fls: find last bit set.
+ */
+
+#define fls(x) generic_fls(x)
+
+#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).
+ */
+
+#define ffs(x) generic_ffs(x)
+
+/*
+ * hweightN: returns the hamming weight (i.e. the number
+ * of bits set) of a N-bit word
+ */
+
+#define hweight32(x) generic_hweight32(x)
+#define hweight16(x) generic_hweight16(x)
+#define hweight8(x) generic_hweight8(x)
+
+#endif /* __KERNEL__ */
+
+#endif /* _ASM_GENERIC_BITOPS_H */