auto import from //depot/cupcake/@135843
diff --git a/libm/i387/npx.h b/libm/i387/npx.h
new file mode 100644
index 0000000..38c2add
--- /dev/null
+++ b/libm/i387/npx.h
@@ -0,0 +1,160 @@
+/*-
+ * Copyright (c) 1990 The Regents of the University of California.
+ * All rights reserved.
+ *
+ * This code is derived from software contributed to Berkeley by
+ * William Jolitz.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 4. Neither the name of the University nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * from: @(#)npx.h 5.3 (Berkeley) 1/18/91
+ * $FreeBSD: src/sys/i386/include/npx.h,v 1.29.2.1 2006/07/01 00:57:55 davidxu Exp $
+ */
+
+/*
+ * 287/387 NPX Coprocessor Data Structures and Constants
+ * W. Jolitz 1/90
+ */
+
+#ifndef _MACHINE_NPX_H_
+#define _MACHINE_NPX_H_
+
+/* Environment information of floating point unit */
+struct env87 {
+ long en_cw; /* control word (16bits) */
+ long en_sw; /* status word (16bits) */
+ long en_tw; /* tag word (16bits) */
+ long en_fip; /* floating point instruction pointer */
+ u_short en_fcs; /* floating code segment selector */
+ u_short en_opcode; /* opcode last executed (11 bits ) */
+ long en_foo; /* floating operand offset */
+ long en_fos; /* floating operand segment selector */
+};
+
+/* Contents of each floating point accumulator */
+struct fpacc87 {
+#ifdef dontdef /* too unportable */
+ u_long fp_mantlo; /* mantissa low (31:0) */
+ u_long fp_manthi; /* mantissa high (63:32) */
+ int fp_exp:15; /* exponent */
+ int fp_sgn:1; /* mantissa sign */
+#else
+ u_char fp_bytes[10];
+#endif
+};
+
+/* Floating point context */
+struct save87 {
+ struct env87 sv_env; /* floating point control/status */
+ struct fpacc87 sv_ac[8]; /* accumulator contents, 0-7 */
+ u_char sv_pad0[4]; /* padding for (now unused) saved status word */
+ /*
+ * Bogus padding for emulators. Emulators should use their own
+ * struct and arrange to store into this struct (ending here)
+ * before it is inspected for ptracing or for core dumps. Some
+ * emulators overwrite the whole struct. We have no good way of
+ * knowing how much padding to leave. Leave just enough for the
+ * GPL emulator's i387_union (176 bytes total).
+ */
+ u_char sv_pad[64]; /* padding; used by emulators */
+};
+
+struct envxmm {
+ u_int16_t en_cw; /* control word (16bits) */
+ u_int16_t en_sw; /* status word (16bits) */
+ u_int16_t en_tw; /* tag word (16bits) */
+ u_int16_t en_opcode; /* opcode last executed (11 bits ) */
+ u_int32_t en_fip; /* floating point instruction pointer */
+ u_int16_t en_fcs; /* floating code segment selector */
+ u_int16_t en_pad0; /* padding */
+ u_int32_t en_foo; /* floating operand offset */
+ u_int16_t en_fos; /* floating operand segment selector */
+ u_int16_t en_pad1; /* padding */
+ u_int32_t en_mxcsr; /* SSE sontorol/status register */
+ u_int32_t en_mxcsr_mask; /* valid bits in mxcsr */
+};
+
+/* Contents of each SSE extended accumulator */
+struct xmmacc {
+ u_char xmm_bytes[16];
+};
+
+struct savexmm {
+ struct envxmm sv_env;
+ struct {
+ struct fpacc87 fp_acc;
+ u_char fp_pad[6]; /* padding */
+ } sv_fp[8];
+ struct xmmacc sv_xmm[8];
+ u_char sv_pad[224];
+} __aligned(16);
+
+union savefpu {
+ struct save87 sv_87;
+ struct savexmm sv_xmm;
+};
+
+/*
+ * The hardware default control word for i387's and later coprocessors is
+ * 0x37F, giving:
+ *
+ * round to nearest
+ * 64-bit precision
+ * all exceptions masked.
+ *
+ * We modify the affine mode bit and precision bits in this to give:
+ *
+ * affine mode for 287's (if they work at all) (1 in bitfield 1<<12)
+ * 53-bit precision (2 in bitfield 3<<8)
+ *
+ * 64-bit precision often gives bad results with high level languages
+ * because it makes the results of calculations depend on whether
+ * intermediate values are stored in memory or in FPU registers.
+ */
+#define __INITIAL_NPXCW__ 0x127F
+#define __INITIAL_MXCSR__ 0x1F80
+
+#ifdef _KERNEL
+
+#define IO_NPX 0x0F0 /* Numeric Coprocessor */
+#define IO_NPXSIZE 16 /* 80387/80487 NPX registers */
+
+#define IRQ_NPX 13
+
+/* full reset on some systems, NOP on others */
+#define npx_full_reset() outb(IO_NPX + 1, 0)
+
+int npxdna(void);
+void npxdrop(void);
+void npxexit(struct thread *td);
+int npxformat(void);
+int npxgetregs(struct thread *td, union savefpu *addr);
+void npxinit(u_short control);
+void npxsave(union savefpu *addr);
+void npxsetregs(struct thread *td, union savefpu *addr);
+int npxtrap(void);
+#endif
+
+#endif /* !_MACHINE_NPX_H_ */