understanding, although the use of vfork seems to be discouraged.
Be sure to read the man page:
http://linux.die.net/man/2/vfork
I normally work in kernel space, so I haven't had much need to use
fork or vfork :)
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).
The calls to class_create and device_create sets things up sp that
udev will create the /dev node.
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importantly, the whatisRCU.txt file.
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Hi miloody,
On Thu, Dec 9, 2010 at 4:58 PM, loody milo...@gmail.com wrote:
...snip...
But I man nothing about times.
$ man 2 times
No manual entry for times in section 2
$
I use die.net when I don't have access to man pages:
http://linux.die.net/man/2/times
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like SMP, PREEMPT
4KSTACKS etc all have to match with the vermagic info from your
module.
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Hi guys,
On Wed, Dec 1, 2010 at 9:30 PM, Hemanth Kumar hemw...@yahoo.co.in wrote:
Hi All,
I tried with gpio-event
from http://svn.hylands.org/linux/gpio-event/module/gpio-event-drv.c which is
provide by Dave Hylands , it gives me the put
./daveuser 156:b:2000
# cat /proc/gpio
iteration.
does this make sense?
I concur.
And this is why routines like list_is_last need to be passed in the
node to test along with the head of the list.
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Hi Robert,
On Sat, Nov 20, 2010 at 11:17 PM, Robert P. J. Day
rpj...@crashcourse.ca wrote:
On Sat, 20 Nov 2010, Dave Hylands wrote:
...snip...
And this is why routines like list_is_last need to be passed in the
node to test along with the head of the list.
huh ... i never knew that test
in an embedded environment (ARM and MIPS),
not programming for linux under x86, so its possible that things
happen a little differently in that environment.
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hole? This particular thing might fit into some weird class of
security holes (things to protect the system from the root user). I'm
much more interested in preventing people from being root in the first
place (much easier to fix in an OS like linux).
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http
. The second phase
of the attack is identical once you're in kernel space.
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Via simple pointers?
Yes - provided it hasn't been swapped out.
There are a few exceptions for a few processors with segmented memory
and other funky stuff, but generally, all of the memory is accessible
from kernel space by the use of a simple pointer.
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, pretty much
anything at all. Writing indiscriminantly through /dev/mem is the same
thing as writing indiscriminantly from within a driver.
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registers directly from user space, which is sometimes useful when you
don't want to write a whole driver just to tweak a register. It can
also be bad to tweak registers this way, so you need to be aware of
the issues.
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/from_user will now work
on kernel buffers.
I'm pretty sure that this is NOT a recoemmended practice, but I
figured I'd throw it out there.
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.
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and puts it into memory.
...snip...
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Hi Wouter,
On Tue, Oct 12, 2010 at 11:50 PM, Wouter Simons l...@woutersimons.org wrote:
On 10/12/2010 04:40 PM, Dave Hylands wrote:
Hi guys,
On Tue, Oct 12, 2010 at 6:46 AM, Wouter Simons l...@woutersimons.org wrote:
On 10/12/2010 12:30 PM, shivanth m p wrote:
...snip...
all:
obj-m
an architecture design thing. I often DMA from
relatively slow devices like audio at 8 kHz into memory. Samples
typically accumulate in a small buffer (part of the audio circuitry)
and are then burst onto the memory bus. There just happens to be lots
of time between the bursts.
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to be done, i.e. all targets are up to date.
The error is essentially saying that mydriver.o already exists and is
newer than mydriver.c.
It would help if you could copy and paste the exact error, along with
all of the other output of running make.
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ls, ps, GCC or XWindows.
If you're installing your new kernel into a system that already has
the tools, then the toolset that was present before will be the
toolset that's present afterwards, just the kernel changes.
This, of course, assumes that your new kernel boots.
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.
Generally speaking, each block on the diagram will have a clock, and
will execute in parallel with the CPU (which is just one of many
blocks).
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+= mydriver.o
else
all : modules
modules :
make -C ..kerndev/linux-2.6/ M=$(PWD) modules
clean :
make -C ../kerndev/linux-2.6/ M=$(PWD) clean
endif
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Hi Robert,
On Mon, Oct 11, 2010 at 11:18 AM, Robert P. J. Day
rpj...@crashcourse.ca wrote:
On Mon, 11 Oct 2010, Dave Hylands wrote:
HI Shivanth,
On Mon, Oct 11, 2010 at 8:20 AM, shivanth m p fordearli...@gmail.com wrote:
I created a kernel module for the 2.6.33 kernel outside the kernel
controller, sometimes an LCD
controller) may cause the CPU to slow down (depends on how the bus
arbiter is set).
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.html
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preemption on all cores.
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are that the ARM is
purely memory mapped - no I/O instructions. In order to turn on the
cache you need to tun on the MMU. Some ARMs use virtually tagged
caches and some use physically tagged caches. There typically is no HW
floating point support, although some of the newer ARMs have it.
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that the module has no module_exit, and
thus can't be unloaded.
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= container_of( ws, struct
my_work_struct, work );
... access your data from my_ws ...
}
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Hi Bond,
Sending to the list this time...
On Fri, Oct 1, 2010 at 10:18 PM, Bond jamesbond.2...@gmail.com wrote:
On Fri, Oct 1, 2010 at 8:13 PM, Dave Hylands dhyla...@gmail.com wrote:
Hi Bond,
There are many different algorithms, and you wanted to know how
indexes would work for tracking
Hi Bond,
On Sat, Oct 2, 2010 at 2:34 AM, Bond jamesbond.2...@gmail.com wrote:
On Sat, Oct 2, 2010 at 1:13 PM, Dave Hylands dhyla...@gmail.com wrote:
Hi Bond,
Sending to the list this time...
glibc has a fairly sophisticated heap...
Look at glibc alternatives. Each one will have a heap
Hi Bond,
On Sat, Oct 2, 2010 at 11:25 AM, Bond jamesbond.2...@gmail.com wrote:
No not glibc I want a link to heap implementation in glibc
Look for malloc... in the glibc source code and go from there
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of RAM, Kernel should see it has IO memory
Is there any option that I can pass to the kernel so that it only takes 768
MB of RAM.
I believe that you can pass mem=768M on the command line
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a separate
list for every 256 bytes, but that would have very low overhead.
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Hi Bond,
On Tue, Sep 28, 2010 at 1:43 AM, Bond jamesbond.2...@gmail.com wrote:
On Tue, Sep 28, 2010 at 11:59 AM, Dave Hylands dhyla...@gmail.com wrote:
Hi Bond,
So user mode programs don't allocate memory using kmalloc. I believe
that they wind up calling __get_free_pages.
There are many data
.
It also appears that CONFIG_PAGE_OFFSET can move around even on ARM
and x86, if other options like CONFIG_VMSPLIT_2G is defined (linux
2.6.34).
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.
So, something like:
printk( 0x%08x\n, *(uint32_t *)0xc0004000 );
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or 304 (base 10)
Makefile.boot is saying
zreladdr-y := 0x13008000
params_phys-y := 0x13000100
This further confirms that physical memory starts at 0x1300
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unbuffered characters will be flushed.
Here's some documentation:
http://linux.die.net/man/3/setvbuf
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which the driver accepted).
write(1, bcde, 4) = 1
So usermode then tried to write the remaining 4 characters.
The driver only accepted one.
write(1, cde, 3) = 1
etc.
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, by the time you actually compile the source for 'func',
struct foo can no longer be incomplete.
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Please read the FAQ at http
://en.wikipedia.org/wiki/Read-copy-update
and the more interesting stuff can be found in your linux
Documentation/RCU/ directory. Start with the rcu.txt file.
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than spinlocks, and if you look at the
implementation of mutexes, you'll find that they actually use
spinlocks (because it is OK to unlock a mutex from an ISR, it just
isn't OK to lock a mutex from an ISR).
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kernel.
So can anyone please clarify this, what is the right scenario.
I'm not familiar enough with the distinctions to provide any more detail here.
I don't see any reason why a process can't signal itself, but this is
just an opinion, not backed up by any fact or experiment.
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, it is possible for there to be a delay between the hardirq
completing and the softirq executing.
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CPUs you can only do 32-bit
arithmetic, with 64-bit addition, subtraction, and multiplications.
64-bit divides must be done using do_div or do_div64.
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some
interrupt occurs, then idle mode is exiting. exit_idle allows for this
to happen.
Take a look at Documentation/timers/highres.txt. It takes advantage of
being able to know when the kernel enters and exits idle mode.
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Hi,
On Thu, Sep 9, 2010 at 12:00 AM, Bond jamesbond.2...@gmail.com wrote:
On Thu, Sep 9, 2010 at 12:04 PM, Dave Hylands dhyla...@gmail.com wrote:
The kernel has the notion of going idle. This happens whenever there
is nothing to do.
Hi Dave from your message I want to ask going idle
Hi Andreas,
On Thu, Sep 9, 2010 at 1:28 AM, Andreas Leppert wu...@web.de wrote:
Hi Dave,
On Wed, Sep 08, 2010 at 11:14:30PM -0700, Dave Hylands wrote:
Replying to the list this time...
finally an answer to *my* problem, thanks :-D
Another general rule, is that on 32-bit CPUs you can only
. Please can anyone explain the sequence of operations how the softirq is
recognized (that it was set) and scheduled to execute.
softirqs and tasklets are really the same thing (as far as I know).
They run with interrupts enabled, but preemption disabled.
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a case of how they're used.
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thing I've been able to get is by following the first 4
lessons in the crash course I mentioned earlier.
http://crashcourse.ca/introduction-linux-kernel-programming/introduction-linux-kernel-programming
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Hi Tapas,
Replying to all this time...
On Fri, Aug 20, 2010 at 12:52 AM, Tapas Mishra wrote:
Hi Dave I could not understand your reply.
Go back to page 48 of the PDF, and look at the example. And then look
at the code you posted. It's missing a line in the spot I indicated.
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/usr/src//usr/src/linux-headers-2.6.28-11/arch/x86/include/asm to your
search path.
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Hi Tapas,
On Fri, Aug 20, 2010 at 9:34 PM, Tapas Mishra mightydre...@gmail.com wrote:
Ohh Ok now it becomes a bit clear,
On Sat, Aug 21, 2010 at 8:51 AM, Dave Hylands dhyla...@gmail.com wrote:
This one:
/usr/src/linux-headers-2.6.28-11/include/linux/module.h
I suspect that you'll also
Hi Tapas,
On Fri, Aug 20, 2010 at 10:27 PM, Dave Hylands dhyla...@gmail.com wrote:
Hi Tapas,
On Fri, Aug 20, 2010 at 10:24 PM, Tapas Mishra mightydre...@gmail.com wrote:
Ya you were right I tried the following this time
gcc -I /usr/src/linux-headers-2.6.28-11/arch/x86/include/asm/ -I
/usr
modify your original path?
Try this:
gcc -I /usr/src/linux-headers-2.6.28-11/arch/x86/include/asm/ -I
/usr/src/linux-headers-2.6.28-11/include/ -c sample2.c
You may still be missing additional paths.
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to be missing the line of code that goes here
{
printk(Sys_exit called with err_code=%d\n,err_code);
return main_sys_exit(err_code);
}
...snip...
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-programming/lesson-4-writing-and-running-your-first-kernel-module
The first 4 lessons are free and if you follow all the steps (start at
the beginnning) you'll get to the point where you can compile a linux
kernel module.
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when udev was launched, which is probably from a script in
/etc/init.d/udev or something similar.
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for your driver which explicitly sets the mode.
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of PMD_SHIFT at all in page.h, and
also no other header files included by it. How does this work?
I think you're supposed to #include linux/mm.h
This includes both asm/page.h and asm/pgtable.h, PMD_SHIFT is defined
by including asm/pgtable.h.
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