On Fri, Jul 03, 2009 at 12:14:41PM +0530, kernel mailz wrote:
>> Thanks for responding to my previous mail. A few more queries
>>
>> a. What is the use of adding format specifiers in inline assembly
>> like
>> asm volatile("ld%U1%X1 %0,%1":"=r"(re
Hi,
Thanks for responding to my previous mail. A few more queries
a. What is the use of adding format specifiers in inline assembly
like
asm volatile("ld%U1%X1 %0,%1":"=r"(ret) : "m"(*ptr) : "memory");
b. using m or Z with a memory address. I tried replacing m/Z but no change
Is there some guid
with memory.
For instance take atomic_add , atomic_add_return, while the
atomic_add_return has the "memory", atomic_add skips it.
-TZ
On Tue, Jun 30, 2009 at 12:57 AM, Scott Wood wrote:
> On Mon, Jun 29, 2009 at 09:19:57PM +0530, kernel mailz wrote:
>> I tried a small e
Consider atomic_add and atomic_add_return in kernel code.
On Tue, Jun 30, 2009 at 2:59 AM, Ian Lance Taylor wrote:
> kernel mailz writes:
>
>> I tried a small example
>>
>> int *p = 0x1000;
>> int a = *p;
>> asm("sync":::"memory");
>&
Did some searching on the archieve
Looks like this is a old patch
[PATCH 03/10] powerpc: Add kexec support for PPC_85xx platforms
Dale Farnsworth
Thu, 22 Nov 2007 07:51:52 -0800
Is this the patch you were referring to kumar
-TZ
On Mon, Jun 29, 2009 at 9:06 PM, wilbur.chan wrote:
> Excuse me ,
"memory" ?
But then why below example of __xchg uses both ?
I am confused!
Anyone has a clue?
-TZ
-- Forwarded message --
From: kernel mailz
Date: Sun, Jun 28, 2009 at 10:27 AM
Subject: Re: Inline Assembly queries
To: Ian Lance Taylor
Cc: gcc-h...@gcc.gnu.org, linux
414: 7d 60 48 28 lwarx r11,0,r9
1418: 7c 00 49 2d stwcx. r0,0,r9
141c: 40 a2 ff f8 bne-1414
1420: 38 60 00 00 li r3,0
1424: 4e 80 00 20 blr
No diff ?
am I choosing the right example ?
-TZ
On Sun, Jun 28, 2009
Hello All the gurus,
I've been fiddling my luck with gcc 4.3.2 inline assembly on powerpc
There are a few queries
1. asm volatile or simply asm produce the same assembly code.
Tried with a few examples but didnt find any difference by adding
volatile with asm
2. Use of "memory" and clobbered reg
Hi,
I have a SMP linux running on 85xx poweprc. Say on Core 0 and Core 1
two different processes are running and on both the schedular runs.
Now for some special case, if one of my process issues a ioctl which
gets serviced by a kernel module, I wish to slow the schedular on that
core only. Otherw
If an aap has to be placed in AS=1 and it issues an ioctl, kernel
needs to be modified ?
I guess the PID=0 trick will work when AS is same
right ?
On 6/25/09, Kumar Gala wrote:
> That is correct. The PID = 0 translations are always valid.
>
> - k
>
> On Jun 25, 2009, at 5:51 A
So this means
when kernel gets interrupted by app which may be in PID=5 (say)
kernel translations for PID=0 remain valid ?
I am not able to follow Scott
-TZ
On Thu, Jun 25, 2009 at 4:22 AM, Scott Wood wrote:
> kernel mailz wrote:
>>
>> But If the app was running with PID=1, i
On Wed, Jun 24, 2009 at 6:45 PM, Kumar Gala wrote:
>
> On Jun 24, 2009, at 4:44 AM, kernel mailz wrote:
>
>> Hi,
>>
>> I am a newbie, trying to learn but have a few queries, nice if you could
>> respond
>> For linux on 85xx systems...
>>
>> (a)
Hi,
I am a newbie, trying to learn but have a few queries, nice if you could
respond
For linux on 85xx systems...
(a) Kernel code runs in PR=0 AS=0 and PID=0, which user space application
run in PR=1 AS=0 and PID 1-255.
Is this correct.
(b) I am writing a small program where the application code
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