imported original firmware WRT54GL_v4.30.11_11_US

1 files changed, 85 insertions, 0 deletions

diff --git a/release/src/include/bitfuncs.h b/release/src/include/bitfuncs.h
new file mode 100644
index 00000000..76ebefd2
--- /dev/null
+++ b/release/src/include/bitfuncs.h
@@ -0,0 +1,85 @@
+/*
+ * bit manipulation utility functions
+ *
+ * Copyright 2005, Broadcom Corporation
+ * All Rights Reserved.
+ * 
+ * THIS SOFTWARE IS OFFERED "AS IS", AND BROADCOM GRANTS NO WARRANTIES OF ANY
+ * KIND, EXPRESS OR IMPLIED, BY STATUTE, COMMUNICATION OR OTHERWISE. BROADCOM
+ * SPECIFICALLY DISCLAIMS ANY IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A SPECIFIC PURPOSE OR NONINFRINGEMENT CONCERNING THIS SOFTWARE.
+ * $Id: bitfuncs.h,v 1.1.1.7 2005/03/07 07:31:12 kanki Exp $
+ */
+
+#ifndef _BITFUNCS_H
+#define _BITFUNCS_H
+
+#include <typedefs.h>
+
+/* local prototypes */
+static INLINE uint32 find_msbit(uint32 x);
+
+
+/*
+ * find_msbit: returns index of most significant set bit in x, with index
+ *   range defined as 0-31.  NOTE: returns zero if input is zero.
+ */
+
+#if defined(USE_PENTIUM_BSR) && defined(__GNUC__)
+
+/*
+ * Implementation for Pentium processors and gcc.  Note that this
+ * instruction is actually very slow on some processors (e.g., family 5,
+ * model 2, stepping 12, "Pentium 75 - 200"), so we use the generic
+ * implementation instead.
+ */
+static INLINE uint32 find_msbit(uint32 x)
+{
+	uint msbit;
+        __asm__("bsrl %1,%0"
+                :"=r" (msbit)
+                :"r" (x));
+        return msbit;
+}
+
+#else
+
+/*
+ * Generic Implementation
+ */
+
+#define DB_POW_MASK16	0xffff0000
+#define DB_POW_MASK8	0x0000ff00
+#define DB_POW_MASK4	0x000000f0
+#define DB_POW_MASK2	0x0000000c
+#define DB_POW_MASK1	0x00000002
+
+static INLINE uint32 find_msbit(uint32 x)
+{
+	uint32 temp_x = x;
+	uint msbit = 0;
+	if (temp_x & DB_POW_MASK16) {
+		temp_x >>= 16;
+		msbit = 16;
+	}
+	if (temp_x & DB_POW_MASK8) {
+		temp_x >>= 8;
+		msbit += 8;
+	}
+	if (temp_x & DB_POW_MASK4) {
+		temp_x >>= 4;
+		msbit += 4;
+	}
+	if (temp_x & DB_POW_MASK2) {
+		temp_x >>= 2;
+		msbit += 2;
+	}
+	if (temp_x & DB_POW_MASK1) {
+		msbit += 1;
+	}
+	return(msbit);
+}
+
+#endif
+
+#endif /* _BITFUNCS_H */