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author | rgrimes <rgrimes@FreeBSD.org> | 1993-08-28 12:41:23 +0000 |
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committer | rgrimes <rgrimes@FreeBSD.org> | 1993-08-28 12:41:23 +0000 |
commit | 7a6447606ece0618edfebfa7be684f86c6265bba (patch) | |
tree | cbb32281c1f1ac4b01f626303f1113e206c41918 /share/man/man4/man4.i386/npx.4 | |
parent | 76c1049755148310b27c1ea06158f4328db902f7 (diff) | |
download | FreeBSD-src-7a6447606ece0618edfebfa7be684f86c6265bba.zip FreeBSD-src-7a6447606ece0618edfebfa7be684f86c6265bba.tar.gz |
New manual pages from NetBSD, revised for FreeBSD slightly
Diffstat (limited to 'share/man/man4/man4.i386/npx.4')
-rw-r--r-- | share/man/man4/man4.i386/npx.4 | 77 |
1 files changed, 77 insertions, 0 deletions
diff --git a/share/man/man4/man4.i386/npx.4 b/share/man/man4/man4.i386/npx.4 new file mode 100644 index 0000000..f904bd1 --- /dev/null +++ b/share/man/man4/man4.i386/npx.4 @@ -0,0 +1,77 @@ +.\" +.\" Copyright (c) 1993 Christopher G. Demetriou +.\" All rights reserved. +.\" +.\" 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. +.\" 3. All advertising materials mentioning features or use of this software +.\" must display the following acknowledgement: +.\" This product includes software developed by Christopher G. Demetriou. +.\" 3. The name of the author may not be used to endorse or promote products +.\" derived from this software withough specific prior written permission +.\" +.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.4,v 1.1 1993/08/06 10:58:03 cgd Exp +.\" $Id$ +.\" +.Dd August 28, 1993 +.Dt NPX 4 i386 +.Os FreeBSD +.Sh NAME +.Nm npx +.Nd +Numeric Processing Extension coprocessor and emulator +.Sh SYNOPSIS +.Cd "options MATH_EMULATE" +.\" XXX this is awful hackery to get it to work right... -- cgd +.Cd "device npx0 at isa? port" \&"IO_NPX0\&" tty irq 13 vector npxintr +.Sh DESCRIPTION +The +.Nm npx +driver enables the use of the system's Numeric Processing Extension +coprocessor, +if one is present. Numeric processing extensions are present in +systems with +.Nm 486DX +CPUs and in systems with +.Nm 387 +or +.Nm 487SX +coprocessors. The +.Nm npx +driver is required for proper system functioning regardless +of whether or not a NPX is present. +.Pp +If there is no NPX present in the system, the "MATH_EMULATE" +option must be defined in the kernel configuration file. +It will provide support for the instructions normally executed +by the NPX. If there is no NPX in the system and the kernel +is not built with math emulation, the system will not boot. +.Sh CAVEATS +The emulator is much slower than the NPX coprocessor. +This will result in poor floating-point math performance +if the emulator must be used. +.Sh BUGS +There are lots of them, especially on cheap motherboards. In particular, +some motherboards do not have the interrupt lines from the NPX to +the CPU wired properly. If this is the case, the emulator must be used +if consistent system operation is desired. +.Pp +Emulation of the transcendental functions instructions is incorrect. +Emulation of other instructions is suspect. |