[9158] in linux-scsi channel archive
RE: inline assembly interpretation
daemon@ATHENA.MIT.EDU (Dunlap, Randy)
Mon Jul 10 19:49:30 2000
Message-ID: <D5E932F578EBD111AC3F00A0C96B1E6F0545CF36@orsmsx31.jf.intel.com>
From: "Dunlap, Randy" <randy.dunlap@intel.com>
To: "'hiren_mehta@agilent.com'" <hiren_mehta@agilent.com>,
linux-scsi@vger.rutgers.edu, linux-kernel@vger.rutgers.edu
Date: Mon, 10 Jul 2000 16:42:00 -0700
MIME-Version: 1.0
Content-Type: text/plain;
charset="iso-8859-1"
Hi,
Are you looking for help with gcc's inline assembly
or with what the instructions (or functions) are doing?
For gcc's assembler info, see
http://gcc.gnu.org/onlinedocs/gcc_4.html#SEC97 & following
pages.
~Randy
___________________________________________________
|Randy Dunlap Intel Corp., DAL Sr. SW Engr.|
|randy.dunlap.at.intel.com 503-696-2055|
|NOTE: Any views presented here are mine alone |
|and may not represent the views of my employer. |
|_________________________________________________|
> -----Original Message-----
> From: hiren_mehta@agilent.com [mailto:hiren_mehta@agilent.com]
> Sent: Monday, July 10, 2000 11:24 AM
> To: linux-scsi@vger.rutgers.edu; linux-kernel@vger.rutgers.edu
> Subject: inline assembly interpretation
>
>
> Is there any document which can help me understand
> the following lines of inline assembly code ?
>
> inline void __const_udelay(unsigned long xloops)
> {
> int d0;
> __asm__("mull %0"
> :"=d" (xloops), "=&a" (d0)
> :"1" (xloops),"0" (current_cpu_data.loops_per_sec));
> __delay(xloops);
> }
>
>
> void __delay(unsigned long loops)
> {
> int d0;
> __asm__ __volatile__(
> "\tjmp 1f\n"
> ".align 16\n"
> "1:\tjmp 2f\n"
> ".align 16\n"
> "2:\tdecl %0\n\tjns 2b"
> :"=&a" (d0)
> :"0" (loops));
> }
>
> Thanks
> -hiren
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