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Date: Mon, 18 Jun 2001 18:20:52 -0500
From: Timur Tabi <ttabi@interactivesi.com>
To: "Linux-Kernel (E-mail)" <linux-kernel@vger.kernel.org>
In-Reply-To: <9319DDF797C4D211AC4700A0C96B7C9404AC2068@orsmsx42.jf.intel.com>
Subject: Re: gnu asm help...
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** Reply to message from "Raj, Ashok" <ashok.raj@intel.com> on Mon, 18 Jun 2001
15:56:50 -0700


> also if there is any reference to the gnu asm symtax, please send me a
> pointer.. 

There's lots

> i can understand what the LOCK "incl %0 means.. but not sure what the rest
> is for.

LOCK just means the x86 "lock" prefix.

incl is the 32-bit version of "inc" (incremement)

You want to return the variable?  Try this:

static __inline__ unsigned long atomic_inc(atomic_t *v)
{
    __asm__ __volatile__(
        LOCK "incl %0"
        :"=m" (v->counter)
        :"m" (v->counter));

    return v->counter;
}


-- 
Timur Tabi - ttabi@interactivesi.com
Interactive Silicon - http://www.interactivesi.com