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Update a bit. Inspired by the mentioned PR.

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PR:		11258
Submitted by:	Motomichi Matsuzaki <mzaki@e-mail.ne.jp> and
		John Reynolds <jjreynold@home.com>
This commit is contained in:
asmodai 2000-02-05 11:56:26 +00:00
parent de5e1b620a
commit b43cab5c02
1 changed files with 15 additions and 4 deletions
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19
share/man/man4/man4.i386/npx.4
View File

@ -38,7 +38,10 @@
.Nd Numeric Processing Extension coprocessor and emulator
.Sh SYNOPSIS
.Cd "device npx0 at nexus? port IO_NPX flags 0x0 irq 13"
.Pp
For hosts without a FPU coprocessor add:
.Cd "options MATH_EMULATE"
or
.Cd "options GPL_MATH_EMULATE"
.\" XXX this is awful hackery to get it to work right... -- cgd
.\" What the heck does he mean? - cracauer
@ -59,14 +62,22 @@ coprocessors. The
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" or
"GPL_MATH_EMULATE" option must be defined in the kernel configuration
If there is no NPX present in the system, the MATH_EMULATE or
GPL_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.
.Pp
You can choose to use a much more fully-featured math emulator (under the
GPL license) by including the option GPL_MATH_EMULATE in your kernel
configuration file instead of the MATH_EMULATE option.
.Pp
The
.Sy GENERIC
kernel configuration uses the MATH_EMULATE option.
.Pp
For a description of the possible "flags" values see the LINT kernel
configuration file.
.Sh CAVEATS
@ -87,6 +98,6 @@ 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 in the non-GPL
emulator is incorrect.
When using the default MATH_EMULATE option,
transcendental function instructions are not implemented.
Emulation of other instructions is suspect.