patch-1.3.45 linux/include/asm-ppc/bitops.h

• Lines: 85
• Date: Sat Nov 25 19:49:06 1995
• Orig file: v1.3.44/linux/include/asm-ppc/bitops.h
• Orig date: Thu Jan 1 02:00:00 1970

diff -u --recursive --new-file v1.3.44/linux/include/asm-ppc/bitops.h linux/include/asm-ppc/bitops.h
@@ -0,0 +1,84 @@
+#ifndef _ASM_PPC_BITOPS_H_
+#define _ASM_PPC_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 integers.
+ * 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
+ */
+
+#include "asm/system.h"  /* For cli/sti declaration */
+
+#define BIT(n) 1<<(n&0x1F)
+typedef unsigned long BITFIELD;
+
+extern __inline__ int set_bit(int nr, void * add)
+/*extern __inline__ int set_bit(int nr, BITFIELD * addr)*/
+{
+       int	mask, oldbit;
+  BITFIELD *addr = add;
+       
+	int s = _disable_interrupts();
+	addr += nr >> 5;
+	mask = BIT(nr);
+	oldbit = (mask & *addr) != 0;
+	*addr |= mask;
+	_enable_interrupts(s);
+
+	
+	return oldbit;
+}
+
+
+/*extern __inline__ int change_bit(int nr, BITFIELD *addr)*/
+extern __inline__ int change_bit(int nr, void *add)
+{
+  	BITFIELD *addr = add;
+	int	mask, retval;
+	int s = _disable_interrupts();
+	addr += nr >> 5;
+	mask = BIT(nr);
+	retval = (mask & *addr) != 0;
+	*addr ^= mask;
+	_enable_interrupts(s);
+	return retval;
+}
+
+
+/*extern __inline__ int clear_bit(int nr, BITFIELD *addr2)*/
+extern __inline__ int clear_bit(int nr, void *add)
+{
+        BITFIELD *addr = add;
+	int	mask, retval;
+	int s = _disable_interrupts();
+	addr += nr >> 5;
+	mask = BIT(nr);
+	retval = (mask & *addr) != 0;
+	*addr &= ~mask;
+	_enable_interrupts(s);
+	return retval;
+}
+
+extern __inline__ int test_bit(int nr, void *add)
+/*extern __inline__ int test_bit(int nr, BITFIELD *addr)*/
+{
+	int	mask;
+	BITFIELD *addr = add;
+
+	addr += nr >> 5;
+	mask = BIT(nr);
+	return ((mask & *addr) != 0);
+}
+
+#endif /* _ASM_PPC_BITOPS_H */
+
+