i386: move math-emu

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 120 insertions, 0 deletions

diff --git a/arch/x86/math-emu/reg_constant.c b/arch/x86/math-emu/reg_constant.c
new file mode 100644
index 00000000000..a8501580196
--- /dev/null
+++ b/arch/x86/math-emu/reg_constant.c
@@ -0,0 +1,120 @@
+/*---------------------------------------------------------------------------+
+ |  reg_constant.c                                                           |
+ |                                                                           |
+ | All of the constant FPU_REGs                                              |
+ |                                                                           |
+ | Copyright (C) 1992,1993,1994,1997                                         |
+ |                     W. Metzenthen, 22 Parker St, Ormond, Vic 3163,        |
+ |                     Australia.  E-mail   billm@suburbia.net               |
+ |                                                                           |
+ |                                                                           |
+ +---------------------------------------------------------------------------*/
+
+#include "fpu_system.h"
+#include "fpu_emu.h"
+#include "status_w.h"
+#include "reg_constant.h"
+#include "control_w.h"
+
+
+#define MAKE_REG(s,e,l,h) { l, h, \
+                            ((EXTENDED_Ebias+(e)) | ((SIGN_##s != 0)*0x8000)) }
+
+FPU_REG const CONST_1    = MAKE_REG(POS, 0, 0x00000000, 0x80000000);
+#if 0
+FPU_REG const CONST_2    = MAKE_REG(POS, 1, 0x00000000, 0x80000000);
+FPU_REG const CONST_HALF = MAKE_REG(POS, -1, 0x00000000, 0x80000000);
+#endif  /*  0  */
+static FPU_REG const CONST_L2T  = MAKE_REG(POS, 1, 0xcd1b8afe, 0xd49a784b);
+static FPU_REG const CONST_L2E  = MAKE_REG(POS, 0, 0x5c17f0bc, 0xb8aa3b29);
+FPU_REG const CONST_PI   = MAKE_REG(POS, 1, 0x2168c235, 0xc90fdaa2);
+FPU_REG const CONST_PI2  = MAKE_REG(POS, 0, 0x2168c235, 0xc90fdaa2);
+FPU_REG const CONST_PI4  = MAKE_REG(POS, -1, 0x2168c235, 0xc90fdaa2);
+static FPU_REG const CONST_LG2  = MAKE_REG(POS, -2, 0xfbcff799, 0x9a209a84);
+static FPU_REG const CONST_LN2  = MAKE_REG(POS, -1, 0xd1cf79ac, 0xb17217f7);
+
+/* Extra bits to take pi/2 to more than 128 bits precision. */
+FPU_REG const CONST_PI2extra = MAKE_REG(NEG, -66,
+					 0xfc8f8cbb, 0xece675d1);
+
+/* Only the sign (and tag) is used in internal zeroes */
+FPU_REG const CONST_Z    = MAKE_REG(POS, EXP_UNDER, 0x0, 0x0);
+
+/* Only the sign and significand (and tag) are used in internal NaNs */
+/* The 80486 never generates one of these 
+FPU_REG const CONST_SNAN = MAKE_REG(POS, EXP_OVER, 0x00000001, 0x80000000);
+ */
+/* This is the real indefinite QNaN */
+FPU_REG const CONST_QNaN = MAKE_REG(NEG, EXP_OVER, 0x00000000, 0xC0000000);
+
+/* Only the sign (and tag) is used in internal infinities */
+FPU_REG const CONST_INF  = MAKE_REG(POS, EXP_OVER, 0x00000000, 0x80000000);
+
+
+static void fld_const(FPU_REG const *c, int adj, u_char tag)
+{
+  FPU_REG *st_new_ptr;
+
+  if ( STACK_OVERFLOW )
+    {
+      FPU_stack_overflow();
+      return;
+    }
+  push();
+  reg_copy(c, st_new_ptr);
+  st_new_ptr->sigl += adj;  /* For all our fldxxx constants, we don't need to
+			       borrow or carry. */
+  FPU_settag0(tag);
+  clear_C1();
+}
+
+/* A fast way to find out whether x is one of RC_DOWN or RC_CHOP
+   (and not one of RC_RND or RC_UP).
+   */
+#define DOWN_OR_CHOP(x)  (x & RC_DOWN)
+
+static void fld1(int rc)
+{
+  fld_const(&CONST_1, 0, TAG_Valid);
+}
+
+static void fldl2t(int rc)
+{
+  fld_const(&CONST_L2T, (rc == RC_UP) ? 1 : 0, TAG_Valid);
+}
+
+static void fldl2e(int rc)
+{
+  fld_const(&CONST_L2E, DOWN_OR_CHOP(rc) ? -1 : 0, TAG_Valid);
+}
+
+static void fldpi(int rc)
+{
+  fld_const(&CONST_PI, DOWN_OR_CHOP(rc) ? -1 : 0, TAG_Valid);
+}
+
+static void fldlg2(int rc)
+{
+  fld_const(&CONST_LG2, DOWN_OR_CHOP(rc) ? -1 : 0, TAG_Valid);
+}
+
+static void fldln2(int rc)
+{
+  fld_const(&CONST_LN2, DOWN_OR_CHOP(rc) ? -1 : 0, TAG_Valid);
+}
+
+static void fldz(int rc)
+{
+  fld_const(&CONST_Z, 0, TAG_Zero);
+}
+
+typedef void (*FUNC_RC)(int);
+
+static FUNC_RC constants_table[] = {
+  fld1, fldl2t, fldl2e, fldpi, fldlg2, fldln2, fldz, (FUNC_RC)FPU_illegal
+};
+
+void fconst(void)
+{
+  (constants_table[FPU_rm])(control_word & CW_RC);
+}