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DragonFly kernel List (threaded) for 2003-07
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Re: syscall messaging interface API

From: Adrian Chadd <adrian@xxxxxxxxxxx>
Date: 24 Jul 2003 00:36:45 GMT

In article <200307231926.h6NJQppi038541@xxxxxxxxxxxxxxxxxxxx>,
  Matthew Dillon wrote:
>     Here is my idea for the system messaging interface.  I will use a
>     new trap gate (0x81) to implement it, because it occurs to me that
>     a message interface really ought to pass and return information in 
>     registers rather then on the stack (since the message itself is already
>     in user memory we might as well just have to do the copyin() on the
>     contents rather then on both the system messaging interface arguments
>     and the contents of the message).  And a new trap gate isolates us from
>     the old syscall mechanism.
>     int 0x81 to dispatch, arguments in eax, ecx, edx, return value in eax.

How will that affect optimisation w/ the limited register set on ia32?


Adrian Chadd			<angryskul> learning is bad
<adrian@xxxxxxxxxxx>		  <angryskul> it just makes the people around you dumber
(angryskul == alfred@irc)	    <angryskul> :(

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