powerpc: move math-emu over to arch/powerpc

Towards the goal of having arch/powerpc not build anything over in arch/ppc
move math-emu over.  Also, killed some references to arch/ppc/ in the
arch/powerpc Makefile which should belong in drivers/ when the particular
sub-arch's move over to arch/powerpc.

Signed-off-by: Kumar Gala <galak@kernel.crashing.org>

arch/powerpc/math-emu/soft-fp.h

@@ -0,0 +1,104 @@
+#ifndef SOFT_FP_H
+#define SOFT_FP_H
+
+#include "sfp-machine.h"
+
+#define _FP_WORKBITS		3
+#define _FP_WORK_LSB		((_FP_W_TYPE)1 << 3)
+#define _FP_WORK_ROUND		((_FP_W_TYPE)1 << 2)
+#define _FP_WORK_GUARD		((_FP_W_TYPE)1 << 1)
+#define _FP_WORK_STICKY		((_FP_W_TYPE)1 << 0)
+
+#ifndef FP_RND_NEAREST
+# define FP_RND_NEAREST		0
+# define FP_RND_ZERO		1
+# define FP_RND_PINF		2
+# define FP_RND_MINF		3
+#ifndef FP_ROUNDMODE
+# define FP_ROUNDMODE		FP_RND_NEAREST
+#endif
+#endif
+
+#define _FP_ROUND_NEAREST(wc, X)			\
+({  int __ret = 0;					\
+    int __frac = _FP_FRAC_LOW_##wc(X) & 15;		\
+    if (__frac & 7) {					\
+      __ret = EFLAG_INEXACT;				\
+      if ((__frac & 7) != _FP_WORK_ROUND)		\
+        _FP_FRAC_ADDI_##wc(X, _FP_WORK_ROUND);		\
+      else if (__frac & _FP_WORK_LSB)			\
+        _FP_FRAC_ADDI_##wc(X, _FP_WORK_ROUND);		\
+    }							\
+    __ret;						\
+})
+
+#define _FP_ROUND_ZERO(wc, X)				\
+({  int __ret = 0;					\
+    if (_FP_FRAC_LOW_##wc(X) & 7)			\
+      __ret = EFLAG_INEXACT;				\
+    __ret;						\
+})
+
+#define _FP_ROUND_PINF(wc, X)				\
+({  int __ret = EFLAG_INEXACT;				\
+    if (!X##_s && (_FP_FRAC_LOW_##wc(X) & 7))		\
+      _FP_FRAC_ADDI_##wc(X, _FP_WORK_LSB);		\
+    else __ret = 0;					\
+    __ret;						\
+})
+
+#define _FP_ROUND_MINF(wc, X)				\
+({  int __ret = EFLAG_INEXACT;				\
+    if (X##_s && (_FP_FRAC_LOW_##wc(X) & 7))		\
+      _FP_FRAC_ADDI_##wc(X, _FP_WORK_LSB);		\
+    else __ret = 0;					\
+    __ret;						\
+})
+
+#define _FP_ROUND(wc, X)			\
+({	int __ret = 0;				\
+	switch (FP_ROUNDMODE)			\
+	{					\
+	  case FP_RND_NEAREST:			\
+	    __ret |= _FP_ROUND_NEAREST(wc,X);	\
+	    break;				\
+	  case FP_RND_ZERO:			\
+	    __ret |= _FP_ROUND_ZERO(wc,X);	\
+	    break;				\
+	  case FP_RND_PINF:			\
+	    __ret |= _FP_ROUND_PINF(wc,X);	\
+	    break;				\
+	  case FP_RND_MINF:			\
+	    __ret |= _FP_ROUND_MINF(wc,X);	\
+	    break;				\
+	};					\
+	__ret;					\
+})
+
+#define FP_CLS_NORMAL		0
+#define FP_CLS_ZERO		1
+#define FP_CLS_INF		2
+#define FP_CLS_NAN		3
+
+#define _FP_CLS_COMBINE(x,y)	(((x) << 2) | (y))
+
+#include "op-1.h"
+#include "op-2.h"
+#include "op-4.h"
+#include "op-common.h"
+
+/* Sigh.  Silly things longlong.h needs.  */
+#define UWtype		_FP_W_TYPE
+#define W_TYPE_SIZE	_FP_W_TYPE_SIZE
+
+typedef int SItype __attribute__((mode(SI)));
+typedef int DItype __attribute__((mode(DI)));
+typedef unsigned int USItype __attribute__((mode(SI)));
+typedef unsigned int UDItype __attribute__((mode(DI)));
+#if _FP_W_TYPE_SIZE == 32
+typedef unsigned int UHWtype __attribute__((mode(HI)));
+#elif _FP_W_TYPE_SIZE == 64
+typedef USItype UHWtype;
+#endif
+
+#endif