add directory Linux-0.98

Linux-0.98/Yggdrasil-0.98.3/usr/include/asm/bitops.h

@@ -0,0 +1,96 @@
+#ifndef _ASM_BITOPS_H
+/*
+ * Copyright 1992, Linus Torvalds.
+ */
+
+#ifdef i386
+/*
+ * These have to be done with inline assembly: that way the bit-setting
+ * is guaranteed to be atomic. Both set_bit and clear_bit return 0
+ * if the bit-setting went ok, != 0 if the bit already was set/cleared.
+ *
+ * bit 0 is the LSB of addr; bit 32 is the LSB of (addr+1).
+ */
+extern inline int set_bit(int nr,int * addr)
+{
+	char ok;
+
+	__asm__ __volatile__("btsl %1,%2\n\tsetb %0":
+		"=q" (ok):"r" (nr),"m" (*(addr)));
+	return ok;
+}
+
+extern inline int clear_bit(int nr, int * addr)
+{
+	char ok;
+
+	__asm__ __volatile__("btrl %1,%2\n\tsetnb %0":
+		"=q" (ok):"r" (nr),"m" (*(addr)));
+	return ok;
+}
+
+/*
+ * This routine doesn't need to be atomic, but it's faster to code it
+ * this way.
+ */
+extern inline int test_bit(int nr, int * addr)
+{
+	char ok;
+
+	__asm__ __volatile__("btl %1,%2\n\tsetb %0":
+		"=q" (ok):"r" (nr),"m" (*(addr)));
+	return ok;
+}
+
+#else
+/*
+ * 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 assmebly 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
+ */
+
+extern inline int set_bit(int nr,int * 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, int * 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, int * addr)
+{
+	int	mask;
+
+	addr += nr >> 5;
+	mask = 1 << (nr & 0x1f);
+	return ((mask & *addr) != 0);
+}
+#endif	/* i386 */
+#endif /* _ASM_BITOPS_H */