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>

1 files changed, 433 insertions, 0 deletions

diff --git a/arch/powerpc/math-emu/op-2.h b/arch/powerpc/math-emu/op-2.h
new file mode 100644
index 000000000000..b9b06b4c6ea1
--- /dev/null
+++ b/arch/powerpc/math-emu/op-2.h
@@ -0,0 +1,433 @@
+/*
+ * Basic two-word fraction declaration and manipulation.
+ */
+
+#define _FP_FRAC_DECL_2(X)	_FP_W_TYPE X##_f0, X##_f1
+#define _FP_FRAC_COPY_2(D,S)	(D##_f0 = S##_f0, D##_f1 = S##_f1)
+#define _FP_FRAC_SET_2(X,I)	__FP_FRAC_SET_2(X, I)
+#define _FP_FRAC_HIGH_2(X)	(X##_f1)
+#define _FP_FRAC_LOW_2(X)	(X##_f0)
+#define _FP_FRAC_WORD_2(X,w)	(X##_f##w)
+
+#define _FP_FRAC_SLL_2(X,N)						\
+  do {									\
+    if ((N) < _FP_W_TYPE_SIZE)						\
+      {									\
+        if (__builtin_constant_p(N) && (N) == 1) 			\
+          {								\
+            X##_f1 = X##_f1 + X##_f1 + (((_FP_WS_TYPE)(X##_f0)) < 0);	\
+            X##_f0 += X##_f0;						\
+          }								\
+        else								\
+          {								\
+	    X##_f1 = X##_f1 << (N) | X##_f0 >> (_FP_W_TYPE_SIZE - (N));	\
+	    X##_f0 <<= (N);						\
+	  }								\
+      }									\
+    else								\
+      {									\
+	X##_f1 = X##_f0 << ((N) - _FP_W_TYPE_SIZE);			\
+	X##_f0 = 0;							\
+      }									\
+  } while (0)
+
+#define _FP_FRAC_SRL_2(X,N)						\
+  do {									\
+    if ((N) < _FP_W_TYPE_SIZE)						\
+      {									\
+	X##_f0 = X##_f0 >> (N) | X##_f1 << (_FP_W_TYPE_SIZE - (N));	\
+	X##_f1 >>= (N);							\
+      }									\
+    else								\
+      {									\
+	X##_f0 = X##_f1 >> ((N) - _FP_W_TYPE_SIZE);			\
+	X##_f1 = 0;							\
+      }									\
+  } while (0)
+
+/* Right shift with sticky-lsb.  */
+#define _FP_FRAC_SRS_2(X,N,sz)						\
+  do {									\
+    if ((N) < _FP_W_TYPE_SIZE)						\
+      {									\
+	X##_f0 = (X##_f1 << (_FP_W_TYPE_SIZE - (N)) | X##_f0 >> (N) |	\
+		  (__builtin_constant_p(N) && (N) == 1			\
+		   ? X##_f0 & 1						\
+		   : (X##_f0 << (_FP_W_TYPE_SIZE - (N))) != 0));	\
+	X##_f1 >>= (N);							\
+      }									\
+    else								\
+      {									\
+	X##_f0 = (X##_f1 >> ((N) - _FP_W_TYPE_SIZE) |			\
+	          (((X##_f1 << (sz - (N))) | X##_f0) != 0));		\
+	X##_f1 = 0;							\
+      }									\
+  } while (0)
+
+#define _FP_FRAC_ADDI_2(X,I) \
+  __FP_FRAC_ADDI_2(X##_f1, X##_f0, I)
+
+#define _FP_FRAC_ADD_2(R,X,Y) \
+  __FP_FRAC_ADD_2(R##_f1, R##_f0, X##_f1, X##_f0, Y##_f1, Y##_f0)
+
+#define _FP_FRAC_SUB_2(R,X,Y) \
+  __FP_FRAC_SUB_2(R##_f1, R##_f0, X##_f1, X##_f0, Y##_f1, Y##_f0)
+
+#define _FP_FRAC_CLZ_2(R,X)	\
+  do {				\
+    if (X##_f1)			\
+      __FP_CLZ(R,X##_f1);	\
+    else 			\
+    {				\
+      __FP_CLZ(R,X##_f0);	\
+      R += _FP_W_TYPE_SIZE;	\
+    }				\
+  } while(0)
+
+/* Predicates */
+#define _FP_FRAC_NEGP_2(X)	((_FP_WS_TYPE)X##_f1 < 0)
+#define _FP_FRAC_ZEROP_2(X)	((X##_f1 | X##_f0) == 0)
+#define _FP_FRAC_OVERP_2(fs,X)	(X##_f1 & _FP_OVERFLOW_##fs)
+#define _FP_FRAC_EQ_2(X, Y)	(X##_f1 == Y##_f1 && X##_f0 == Y##_f0)
+#define _FP_FRAC_GT_2(X, Y)	\
+  ((X##_f1 > Y##_f1) || (X##_f1 == Y##_f1 && X##_f0 > Y##_f0))
+#define _FP_FRAC_GE_2(X, Y)	\
+  ((X##_f1 > Y##_f1) || (X##_f1 == Y##_f1 && X##_f0 >= Y##_f0))
+
+#define _FP_ZEROFRAC_2		0, 0
+#define _FP_MINFRAC_2		0, 1
+
+/*
+ * Internals
+ */
+
+#define __FP_FRAC_SET_2(X,I1,I0)	(X##_f0 = I0, X##_f1 = I1)
+
+#define __FP_CLZ_2(R, xh, xl)	\
+  do {				\
+    if (xh)			\
+      __FP_CLZ(R,xl);		\
+    else 			\
+    {				\
+      __FP_CLZ(R,xl);		\
+      R += _FP_W_TYPE_SIZE;	\
+    }				\
+  } while(0)
+
+#if 0
+
+#ifndef __FP_FRAC_ADDI_2
+#define __FP_FRAC_ADDI_2(xh, xl, i) \
+  (xh += ((xl += i) < i))
+#endif
+#ifndef __FP_FRAC_ADD_2
+#define __FP_FRAC_ADD_2(rh, rl, xh, xl, yh, yl) \
+  (rh = xh + yh + ((rl = xl + yl) < xl))
+#endif
+#ifndef __FP_FRAC_SUB_2
+#define __FP_FRAC_SUB_2(rh, rl, xh, xl, yh, yl) \
+  (rh = xh - yh - ((rl = xl - yl) > xl))
+#endif
+
+#else
+
+#undef __FP_FRAC_ADDI_2
+#define __FP_FRAC_ADDI_2(xh, xl, i)	add_ssaaaa(xh, xl, xh, xl, 0, i)
+#undef __FP_FRAC_ADD_2
+#define __FP_FRAC_ADD_2			add_ssaaaa
+#undef __FP_FRAC_SUB_2
+#define __FP_FRAC_SUB_2			sub_ddmmss
+
+#endif
+
+/*
+ * Unpack the raw bits of a native fp value.  Do not classify or
+ * normalize the data.
+ */
+
+#define _FP_UNPACK_RAW_2(fs, X, val)			\
+  do {							\
+    union _FP_UNION_##fs _flo; _flo.flt = (val);	\
+							\
+    X##_f0 = _flo.bits.frac0;				\
+    X##_f1 = _flo.bits.frac1;				\
+    X##_e  = _flo.bits.exp;				\
+    X##_s  = _flo.bits.sign;				\
+  } while (0)
+
+
+/*
+ * Repack the raw bits of a native fp value.
+ */
+
+#define _FP_PACK_RAW_2(fs, val, X)			\
+  do {							\
+    union _FP_UNION_##fs _flo;				\
+							\
+    _flo.bits.frac0 = X##_f0;				\
+    _flo.bits.frac1 = X##_f1;				\
+    _flo.bits.exp   = X##_e;				\
+    _flo.bits.sign  = X##_s;				\
+							\
+    (val) = _flo.flt;					\
+  } while (0)
+
+
+/*
+ * Multiplication algorithms:
+ */
+
+/* Given a 1W * 1W => 2W primitive, do the extended multiplication.  */
+
+#define _FP_MUL_MEAT_2_wide(fs, R, X, Y, doit)				\
+  do {									\
+    _FP_FRAC_DECL_4(_z); _FP_FRAC_DECL_2(_b); _FP_FRAC_DECL_2(_c);	\
+									\
+    doit(_FP_FRAC_WORD_4(_z,1), _FP_FRAC_WORD_4(_z,0), X##_f0, Y##_f0); \
+    doit(_b_f1, _b_f0, X##_f0, Y##_f1);					\
+    doit(_c_f1, _c_f0, X##_f1, Y##_f0);					\
+    doit(_FP_FRAC_WORD_4(_z,3), _FP_FRAC_WORD_4(_z,2), X##_f1, Y##_f1); \
+									\
+    __FP_FRAC_ADD_4(_FP_FRAC_WORD_4(_z,3),_FP_FRAC_WORD_4(_z,2),	\
+		    _FP_FRAC_WORD_4(_z,1),_FP_FRAC_WORD_4(_z,0),	\
+		    0, _b_f1, _b_f0, 0,					\
+		    _FP_FRAC_WORD_4(_z,3),_FP_FRAC_WORD_4(_z,2),	\
+		    _FP_FRAC_WORD_4(_z,1),_FP_FRAC_WORD_4(_z,0));	\
+    __FP_FRAC_ADD_4(_FP_FRAC_WORD_4(_z,3),_FP_FRAC_WORD_4(_z,2),	\
+		    _FP_FRAC_WORD_4(_z,1),_FP_FRAC_WORD_4(_z,0),	\
+		    0, _c_f1, _c_f0, 0,					\
+		    _FP_FRAC_WORD_4(_z,3),_FP_FRAC_WORD_4(_z,2),	\
+		    _FP_FRAC_WORD_4(_z,1),_FP_FRAC_WORD_4(_z,0));	\
+									\
+    /* Normalize since we know where the msb of the multiplicands	\
+       were (bit B), we know that the msb of the of the product is	\
+       at either 2B or 2B-1.  */					\
+    _FP_FRAC_SRS_4(_z, _FP_WFRACBITS_##fs-1, 2*_FP_WFRACBITS_##fs);	\
+    R##_f0 = _FP_FRAC_WORD_4(_z,0);					\
+    R##_f1 = _FP_FRAC_WORD_4(_z,1);					\
+  } while (0)
+
+/* This next macro appears to be totally broken. Fortunately nowhere
+ * seems to use it :-> The problem is that we define _z[4] but
+ * then use it in _FP_FRAC_SRS_4, which will attempt to access
+ * _z_f[n] which will cause an error. The fix probably involves
+ * declaring it with _FP_FRAC_DECL_4, see previous macro. -- PMM 02/1998
+ */
+#define _FP_MUL_MEAT_2_gmp(fs, R, X, Y)					\
+  do {									\
+    _FP_W_TYPE _x[2], _y[2], _z[4];					\
+    _x[0] = X##_f0; _x[1] = X##_f1;					\
+    _y[0] = Y##_f0; _y[1] = Y##_f1;					\
+									\
+    mpn_mul_n(_z, _x, _y, 2);						\
+									\
+    /* Normalize since we know where the msb of the multiplicands	\
+       were (bit B), we know that the msb of the of the product is	\
+       at either 2B or 2B-1.  */					\
+    _FP_FRAC_SRS_4(_z, _FP_WFRACBITS##_fs-1, 2*_FP_WFRACBITS_##fs);	\
+    R##_f0 = _z[0];							\
+    R##_f1 = _z[1];							\
+  } while (0)
+
+
+/*
+ * Division algorithms:
+ * This seems to be giving me difficulties -- PMM
+ * Look, NetBSD seems to be able to comment algorithms. Can't you?
+ * I've thrown printks at the problem.
+ * This now appears to work, but I still don't really know why.
+ * Also, I don't think the result is properly normalised...
+ */
+
+#define _FP_DIV_MEAT_2_udiv_64(fs, R, X, Y)				\
+  do {									\
+    extern void _fp_udivmodti4(_FP_W_TYPE q[2], _FP_W_TYPE r[2],	\
+			       _FP_W_TYPE n1, _FP_W_TYPE n0,		\
+			       _FP_W_TYPE d1, _FP_W_TYPE d0);		\
+    _FP_W_TYPE _n_f3, _n_f2, _n_f1, _n_f0, _r_f1, _r_f0;		\
+    _FP_W_TYPE _q_f1, _q_f0, _m_f1, _m_f0;				\
+    _FP_W_TYPE _rmem[2], _qmem[2];					\
+    /* I think this check is to ensure that the result is normalised.   \
+     * Assuming X,Y normalised (ie in [1.0,2.0)) X/Y will be in         \
+     * [0.5,2.0). Furthermore, it will be less than 1.0 iff X < Y.      \
+     * In this case we tweak things. (this is based on comments in      \
+     * the NetBSD FPU emulation code. )                                 \
+     * We know X,Y are normalised because we ensure this as part of     \
+     * the unpacking process. -- PMM                                    \
+     */									\
+    if (_FP_FRAC_GT_2(X, Y))						\
+      {									\
+/*	R##_e++; */							\
+	_n_f3 = X##_f1 >> 1;						\
+	_n_f2 = X##_f1 << (_FP_W_TYPE_SIZE - 1) | X##_f0 >> 1;		\
+	_n_f1 = X##_f0 << (_FP_W_TYPE_SIZE - 1);			\
+	_n_f0 = 0;							\
+      }									\
+    else								\
+      {									\
+	R##_e--;							\
+	_n_f3 = X##_f1;							\
+	_n_f2 = X##_f0;							\
+	_n_f1 = _n_f0 = 0;						\
+      }									\
+									\
+    /* Normalize, i.e. make the most significant bit of the 		\
+       denominator set.  CHANGED: - 1 to nothing -- PMM */		\
+    _FP_FRAC_SLL_2(Y, _FP_WFRACXBITS_##fs /* -1 */);			\
+									\
+    /* Do the 256/128 bit division given the 128-bit _fp_udivmodtf4 	\
+       primitive snagged from libgcc2.c.  */				\
+									\
+    _fp_udivmodti4(_qmem, _rmem, _n_f3, _n_f2, 0, Y##_f1);		\
+    _q_f1 = _qmem[0];							\
+    umul_ppmm(_m_f1, _m_f0, _q_f1, Y##_f0);				\
+    _r_f1 = _rmem[0];							\
+    _r_f0 = _n_f1;							\
+    if (_FP_FRAC_GT_2(_m, _r))						\
+      {									\
+	_q_f1--;							\
+	_FP_FRAC_ADD_2(_r, _r, Y);					\
+	if (_FP_FRAC_GE_2(_r, Y) && _FP_FRAC_GT_2(_m, _r))		\
+	  {								\
+	    _q_f1--;							\
+	    _FP_FRAC_ADD_2(_r, _r, Y);					\
+	  }								\
+      }									\
+    _FP_FRAC_SUB_2(_r, _r, _m);						\
+									\
+    _fp_udivmodti4(_qmem, _rmem, _r_f1, _r_f0, 0, Y##_f1);		\
+    _q_f0 = _qmem[0];							\
+    umul_ppmm(_m_f1, _m_f0, _q_f0, Y##_f0);				\
+    _r_f1 = _rmem[0];							\
+    _r_f0 = _n_f0;							\
+    if (_FP_FRAC_GT_2(_m, _r))						\
+      {									\
+	_q_f0--;							\
+	_FP_FRAC_ADD_2(_r, _r, Y);					\
+	if (_FP_FRAC_GE_2(_r, Y) && _FP_FRAC_GT_2(_m, _r))		\
+	  {								\
+	    _q_f0--;							\
+	    _FP_FRAC_ADD_2(_r, _r, Y);					\
+	  }								\
+      }									\
+    _FP_FRAC_SUB_2(_r, _r, _m);						\
+									\
+    R##_f1 = _q_f1;							\
+    R##_f0 = _q_f0 | ((_r_f1 | _r_f0) != 0);				\
+    /* adjust so answer is normalized again. I'm not sure what the 	\
+     * final sz param should be. In practice it's never used since      \
+     * N is 1 which is always going to be < _FP_W_TYPE_SIZE...		\
+     */									\
+    /* _FP_FRAC_SRS_2(R,1,_FP_WFRACBITS_##fs);	*/			\
+  } while (0)
+
+
+#define _FP_DIV_MEAT_2_gmp(fs, R, X, Y)					\
+  do {									\
+    _FP_W_TYPE _x[4], _y[2], _z[4];					\
+    _y[0] = Y##_f0; _y[1] = Y##_f1;					\
+    _x[0] = _x[3] = 0;							\
+    if (_FP_FRAC_GT_2(X, Y))						\
+      {									\
+	R##_e++;							\
+	_x[1] = (X##_f0 << (_FP_WFRACBITS-1 - _FP_W_TYPE_SIZE) |	\
+		 X##_f1 >> (_FP_W_TYPE_SIZE -				\
+			    (_FP_WFRACBITS-1 - _FP_W_TYPE_SIZE)));	\
+	_x[2] = X##_f1 << (_FP_WFRACBITS-1 - _FP_W_TYPE_SIZE);		\
+      }									\
+    else								\
+      {									\
+	_x[1] = (X##_f0 << (_FP_WFRACBITS - _FP_W_TYPE_SIZE) |		\
+		 X##_f1 >> (_FP_W_TYPE_SIZE -				\
+			    (_FP_WFRACBITS - _FP_W_TYPE_SIZE)));	\
+	_x[2] = X##_f1 << (_FP_WFRACBITS - _FP_W_TYPE_SIZE);		\
+      }									\
+									\
+    (void) mpn_divrem (_z, 0, _x, 4, _y, 2);				\
+    R##_f1 = _z[1];							\
+    R##_f0 = _z[0] | ((_x[0] | _x[1]) != 0);				\
+  } while (0)
+
+
+/*
+ * Square root algorithms:
+ * We have just one right now, maybe Newton approximation
+ * should be added for those machines where division is fast.
+ */
+
+#define _FP_SQRT_MEAT_2(R, S, T, X, q)			\
+  do {							\
+    while (q)						\
+      {							\
+        T##_f1 = S##_f1 + q;				\
+        if (T##_f1 <= X##_f1)				\
+          {						\
+            S##_f1 = T##_f1 + q;			\
+            X##_f1 -= T##_f1;				\
+            R##_f1 += q;				\
+          }						\
+        _FP_FRAC_SLL_2(X, 1);				\
+        q >>= 1;					\
+      }							\
+    q = (_FP_W_TYPE)1 << (_FP_W_TYPE_SIZE - 1);		\
+    while (q)						\
+      {							\
+        T##_f0 = S##_f0 + q;				\
+        T##_f1 = S##_f1;				\
+        if (T##_f1 < X##_f1 || 				\
+            (T##_f1 == X##_f1 && T##_f0 < X##_f0))	\
+          {						\
+            S##_f0 = T##_f0 + q;			\
+            if (((_FP_WS_TYPE)T##_f0) < 0 &&		\
+                ((_FP_WS_TYPE)S##_f0) >= 0)		\
+              S##_f1++;					\
+            _FP_FRAC_SUB_2(X, X, T);			\
+            R##_f0 += q;				\
+          }						\
+        _FP_FRAC_SLL_2(X, 1);				\
+        q >>= 1;					\
+      }							\
+  } while (0)
+
+
+/*
+ * Assembly/disassembly for converting to/from integral types.
+ * No shifting or overflow handled here.
+ */
+
+#define _FP_FRAC_ASSEMBLE_2(r, X, rsize)	\
+  do {						\
+    if (rsize <= _FP_W_TYPE_SIZE)		\
+      r = X##_f0;				\
+    else					\
+      {						\
+	r = X##_f1;				\
+	r <<= _FP_W_TYPE_SIZE;			\
+	r += X##_f0;				\
+      }						\
+  } while (0)
+
+#define _FP_FRAC_DISASSEMBLE_2(X, r, rsize)				\
+  do {									\
+    X##_f0 = r;								\
+    X##_f1 = (rsize <= _FP_W_TYPE_SIZE ? 0 : r >> _FP_W_TYPE_SIZE);	\
+  } while (0)
+
+/*
+ * Convert FP values between word sizes
+ */
+
+#define _FP_FRAC_CONV_1_2(dfs, sfs, D, S)				\
+  do {									\
+    _FP_FRAC_SRS_2(S, (_FP_WFRACBITS_##sfs - _FP_WFRACBITS_##dfs),	\
+		   _FP_WFRACBITS_##sfs);				\
+    D##_f = S##_f0;							\
+  } while (0)
+
+#define _FP_FRAC_CONV_2_1(dfs, sfs, D, S)				\
+  do {									\
+    D##_f0 = S##_f;							\
+    D##_f1 = 0;								\
+    _FP_FRAC_SLL_2(D, (_FP_WFRACBITS_##dfs - _FP_WFRACBITS_##sfs));	\
+  } while (0)
+