linux-kernel - Re: [RFC][3/11][MANUX] Kernel compatibility : syscall numbers

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Message-ID: <534E2B4B.30801@ladisch.de>
Date:	Wed, 16 Apr 2014 09:03:39 +0200
From:	Clemens Ladisch <clemens@...isch.de>
To:	Emmanuel Colbus <ecolbus@...ux.info>, linux-kernel@...r.kernel.org
Subject: Re: [RFC][3/11][MANUX] Kernel compatibility : syscall numbers

Emmanuel Colbus wrote:
> I have a question regarding vector 0x80.
>
> As I mentionned earlier, my OS's internals are very different from
> Linux's, thus I have had a need for a few new syscalls. Since I wanted
> to avoid any collision with Linux

... you could just use another vector, such as 0x81.

> but I also wanted to keep the ability to put the syscall table in
> a single 4096-byte page on 64-bit computers (on which I hope to run
> one day), I chose to start taking syscall number 511, and to progress
> downwards - currently, I'm using numbers 511 through 501 included

These implementation details do not need to show up in the interface:

int syscall_0x81(int nr, ...)
{
    if (nr in range)
        return table[511 - nr](...);
}


Regards,
Clemens
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