Initial import

1 files changed, 228 insertions, 0 deletions

diff --git a/arch/parisc/include/asm/bitops.h b/arch/parisc/include/asm/bitops.h
new file mode 100644
index 000000000..3f9406d9b
--- /dev/null
+++ b/arch/parisc/include/asm/bitops.h
@@ -0,0 +1,228 @@
+#ifndef _PARISC_BITOPS_H
+#define _PARISC_BITOPS_H
+
+#ifndef _LINUX_BITOPS_H
+#error only <linux/bitops.h> can be included directly
+#endif
+
+#include <linux/compiler.h>
+#include <asm/types.h>		/* for BITS_PER_LONG/SHIFT_PER_LONG */
+#include <asm/byteorder.h>
+#include <asm/barrier.h>
+#include <linux/atomic.h>
+
+/*
+ * HP-PARISC specific bit operations
+ * for a detailed description of the functions please refer
+ * to include/asm-i386/bitops.h or kerneldoc
+ */
+
+#define CHOP_SHIFTCOUNT(x) (((unsigned long) (x)) & (BITS_PER_LONG - 1))
+
+
+/* See http://marc.theaimsgroup.com/?t=108826637900003 for discussion
+ * on use of volatile and __*_bit() (set/clear/change):
+ *	*_bit() want use of volatile.
+ *	__*_bit() are "relaxed" and don't use spinlock or volatile.
+ */
+
+static __inline__ void set_bit(int nr, volatile unsigned long * addr)
+{
+	unsigned long mask = 1UL << CHOP_SHIFTCOUNT(nr);
+	unsigned long flags;
+
+	addr += (nr >> SHIFT_PER_LONG);
+	_atomic_spin_lock_irqsave(addr, flags);
+	*addr |= mask;
+	_atomic_spin_unlock_irqrestore(addr, flags);
+}
+
+static __inline__ void clear_bit(int nr, volatile unsigned long * addr)
+{
+	unsigned long mask = ~(1UL << CHOP_SHIFTCOUNT(nr));
+	unsigned long flags;
+
+	addr += (nr >> SHIFT_PER_LONG);
+	_atomic_spin_lock_irqsave(addr, flags);
+	*addr &= mask;
+	_atomic_spin_unlock_irqrestore(addr, flags);
+}
+
+static __inline__ void change_bit(int nr, volatile unsigned long * addr)
+{
+	unsigned long mask = 1UL << CHOP_SHIFTCOUNT(nr);
+	unsigned long flags;
+
+	addr += (nr >> SHIFT_PER_LONG);
+	_atomic_spin_lock_irqsave(addr, flags);
+	*addr ^= mask;
+	_atomic_spin_unlock_irqrestore(addr, flags);
+}
+
+static __inline__ int test_and_set_bit(int nr, volatile unsigned long * addr)
+{
+	unsigned long mask = 1UL << CHOP_SHIFTCOUNT(nr);
+	unsigned long old;
+	unsigned long flags;
+	int set;
+
+	addr += (nr >> SHIFT_PER_LONG);
+	_atomic_spin_lock_irqsave(addr, flags);
+	old = *addr;
+	set = (old & mask) ? 1 : 0;
+	if (!set)
+		*addr = old | mask;
+	_atomic_spin_unlock_irqrestore(addr, flags);
+
+	return set;
+}
+
+static __inline__ int test_and_clear_bit(int nr, volatile unsigned long * addr)
+{
+	unsigned long mask = 1UL << CHOP_SHIFTCOUNT(nr);
+	unsigned long old;
+	unsigned long flags;
+	int set;
+
+	addr += (nr >> SHIFT_PER_LONG);
+	_atomic_spin_lock_irqsave(addr, flags);
+	old = *addr;
+	set = (old & mask) ? 1 : 0;
+	if (set)
+		*addr = old & ~mask;
+	_atomic_spin_unlock_irqrestore(addr, flags);
+
+	return set;
+}
+
+static __inline__ int test_and_change_bit(int nr, volatile unsigned long * addr)
+{
+	unsigned long mask = 1UL << CHOP_SHIFTCOUNT(nr);
+	unsigned long oldbit;
+	unsigned long flags;
+
+	addr += (nr >> SHIFT_PER_LONG);
+	_atomic_spin_lock_irqsave(addr, flags);
+	oldbit = *addr;
+	*addr = oldbit ^ mask;
+	_atomic_spin_unlock_irqrestore(addr, flags);
+
+	return (oldbit & mask) ? 1 : 0;
+}
+
+#include <asm-generic/bitops/non-atomic.h>
+
+#ifdef __KERNEL__
+
+/**
+ * __ffs - find first bit in word. returns 0 to "BITS_PER_LONG-1".
+ * @word: The word to search
+ *
+ * __ffs() return is undefined if no bit is set.
+ *
+ * 32-bit fast __ffs by LaMont Jones "lamont At hp com".
+ * 64-bit enhancement by Grant Grundler "grundler At parisc-linux org".
+ * (with help from willy/jejb to get the semantics right)
+ *
+ * This algorithm avoids branches by making use of nullification.
+ * One side effect of "extr" instructions is it sets PSW[N] bit.
+ * How PSW[N] (nullify next insn) gets set is determined by the 
+ * "condition" field (eg "<>" or "TR" below) in the extr* insn.
+ * Only the 1st and one of either the 2cd or 3rd insn will get executed.
+ * Each set of 3 insn will get executed in 2 cycles on PA8x00 vs 16 or so
+ * cycles for each mispredicted branch.
+ */
+
+static __inline__ unsigned long __ffs(unsigned long x)
+{
+	unsigned long ret;
+
+	__asm__(
+#ifdef CONFIG_64BIT
+		" ldi       63,%1\n"
+		" extrd,u,*<>  %0,63,32,%%r0\n"
+		" extrd,u,*TR  %0,31,32,%0\n"	/* move top 32-bits down */
+		" addi    -32,%1,%1\n"
+#else
+		" ldi       31,%1\n"
+#endif
+		" extru,<>  %0,31,16,%%r0\n"
+		" extru,TR  %0,15,16,%0\n"	/* xxxx0000 -> 0000xxxx */
+		" addi    -16,%1,%1\n"
+		" extru,<>  %0,31,8,%%r0\n"
+		" extru,TR  %0,23,8,%0\n"	/* 0000xx00 -> 000000xx */
+		" addi    -8,%1,%1\n"
+		" extru,<>  %0,31,4,%%r0\n"
+		" extru,TR  %0,27,4,%0\n"	/* 000000x0 -> 0000000x */
+		" addi    -4,%1,%1\n"
+		" extru,<>  %0,31,2,%%r0\n"
+		" extru,TR  %0,29,2,%0\n"	/* 0000000y, 1100b -> 0011b */
+		" addi    -2,%1,%1\n"
+		" extru,=  %0,31,1,%%r0\n"	/* check last bit */
+		" addi    -1,%1,%1\n"
+			: "+r" (x), "=r" (ret) );
+	return ret;
+}
+
+#include <asm-generic/bitops/ffz.h>
+
+/*
+ * ffs: find first bit set. returns 1 to BITS_PER_LONG or 0 (if none 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).
+ */
+static __inline__ int ffs(int x)
+{
+	return x ? (__ffs((unsigned long)x) + 1) : 0;
+}
+
+/*
+ * fls: find last (most significant) bit set.
+ * fls(0) = 0, fls(1) = 1, fls(0x80000000) = 32.
+ */
+
+static __inline__ int fls(int x)
+{
+	int ret;
+	if (!x)
+		return 0;
+
+	__asm__(
+	"	ldi		1,%1\n"
+	"	extru,<>	%0,15,16,%%r0\n"
+	"	zdep,TR		%0,15,16,%0\n"		/* xxxx0000 */
+	"	addi		16,%1,%1\n"
+	"	extru,<>	%0,7,8,%%r0\n"
+	"	zdep,TR		%0,23,24,%0\n"		/* xx000000 */
+	"	addi		8,%1,%1\n"
+	"	extru,<>	%0,3,4,%%r0\n"
+	"	zdep,TR		%0,27,28,%0\n"		/* x0000000 */
+	"	addi		4,%1,%1\n"
+	"	extru,<>	%0,1,2,%%r0\n"
+	"	zdep,TR		%0,29,30,%0\n"		/* y0000000 (y&3 = 0) */
+	"	addi		2,%1,%1\n"
+	"	extru,=		%0,0,1,%%r0\n"
+	"	addi		1,%1,%1\n"		/* if y & 8, add 1 */
+		: "+r" (x), "=r" (ret) );
+
+	return ret;
+}
+
+#include <asm-generic/bitops/__fls.h>
+#include <asm-generic/bitops/fls64.h>
+#include <asm-generic/bitops/hweight.h>
+#include <asm-generic/bitops/lock.h>
+#include <asm-generic/bitops/sched.h>
+
+#endif /* __KERNEL__ */
+
+#include <asm-generic/bitops/find.h>
+
+#ifdef __KERNEL__
+
+#include <asm-generic/bitops/le.h>
+#include <asm-generic/bitops/ext2-atomic-setbit.h>
+
+#endif	/* __KERNEL__ */
+
+#endif /* _PARISC_BITOPS_H */