在 2013-1-11，0:42，"Yann Droneaud" 写道：
>> Hello kernel hackers,
>>
>>
>> I noticed that in [linux]/include/uapi/linux/nbd.h the structure
>>
>> struct nbd_request {
>> __be32 magic;
>> __be32 type;/* == READ || == WRITE */
>> char handle[8];
>> __b
orrect for all architectures?
>> >
>> > I guess not, asmlinkage is undefined for arm, so I assume this mechanism is
>> > not there for arm.
>> then how do they do it?
>> >
>> >
>> >
>> > On Fri, Jan 4, 2013 at 2:24 PM, 卜弋天 wrote:
>> >
在 2013-1-4，15:38，"Rajat Sharma" 写道：
> > So with asmlinkage we request compiler to put args on stack. What is
> > advantage of this to start_kernel or in general to other functions ?
>
> See its about implementation ease and little of performance too. Assuming the
> default model of keeping a
在 2012-12-12，19:28，"Manavendra Nath Manav" 写道：
> On Wed, Dec 12, 2012 at 4:38 PM, Fabio Pozzi wrote:
>>> When i call print values at offsets starting from
>>> __builtin_frame_address (0) the function arguments start from offset
>>> 2. How can I confirm that this behavior is always consistent.
i don't know why you want to corrupt kernel stack by using this method, stack
usually grow from high address to low address, if you allocate a buff in a
function then use memset(), it is writing data from low address to high
address.in your implementation, you allocate an array with 8000*4=3200
Date: Tue, 17 Jul 2012 21:15:50 +0200
Subject: setup_thread_stack
From: francesco.sc...@gmail.com
To: kernelnewbies@kernelnewbies.org
Hi,
I'm totally new to kernel code, just trying to understand the basics of the
core subsystems.
During the do_fork call, there is a call to dup_task_struc
> Date: Wed, 4 Jul 2012 08:12:25 -0700
> Subject: Re: Why can not processes switch in atomic context?
> From: dhyla...@gmail.com
> To: bu...@live.cn
> CC: mobile.parmeni...@gmail.com; kernelnewbies@kernelnewbies.org
>
> Hi,
>
> On Wed, Jul 4, 2012 at 3:44 AM, 弋天 卜 wrote:
> >
> >
> > 在 2012-
> Date: Wed, 4 Jul 2012 08:12:25 -0700
> Subject: Re: Why can not processes switch in atomic context?
> From: dhyla...@gmail.com
> To: bu...@live.cn
> CC: mobile.parmeni...@gmail.com; kernelnewbies@kernelnewbies.org
>
> Hi,
>
> On Wed, Jul 4, 2012 at 3:44 AM, 弋天 卜 wrote:
> >
> >
> > 在 2012-
> Now this also means that increasing vmalloc inadvertently reduces lowmem.
> Why is this designed such a way?
It may or may not depending on the amount of physical memory and the
size of the vmalloc space.
vmalloc space will normally increase vmalloc_end, which won't reduce lowmem.
If the
> Suppose your machine has 1 GB of RAM with a physical addresses of
> 0x4000 thru 0x7FFF
>
> Let's suppose that PHYS_OFFSET = 0xC000
> Let's suppose that VMALLOC_START is set to 0xE000 and VMALLOC_END
> is at 0xEFFF (256 Mb)
>
is this PAGE_OFFSET or PHYS_OFFSET?
> So what w
Hi All:i have a vmlinux file, how can i know when it is created/compiled?
thanks. Best Regards ___
Kernelnewbies mailing list
Kernelnewbies@kernelnewbies.org
http://lists.kernelnewbies.org/mailman/listinfo/k
Hi :you can find out the meaning in vmalloc.c, function vmalloc().
vmalloc accept only one parameter, the size of memory that you want to
allocate. this function will return the virtual address which you can use to
read/write data inside it. vmalloc hides some implementation details
> Date: Sun, 11 Mar 2012 12:29:44 +0530
> Subject: static I/O device mapping of UART for early prints & console
> From: pcuser.ma...@gmail.com
> To: kernelnewbies@kernelnewbies.org
>
> I'm doing kernel porting to arm926 based FPGA board (similar to
> samsung-s3c6410 board). I'm trying to setup
Hi experts: an user application generates a un-alignment data abort, then
in function do_alignment, kernel read the instruction from the address where
data abort occurs by: fault = __get_user(instr, (u32 *)instrptr);after
this sentence, instr is the error instruction that generate
Hi All:
anybody who met such error of Android application? the logcat will be
something like below:
signal 7 (SIGBUS), code 128 (?), fault addr
#00 pc 00015cec /data/data/com.pccw.mobile.sip/lib/libavcodec.so
<--this lib use ARM NEON instructions
re
> completely disabled, (I mean no other can interrupt the processor)
> while executing an interrupt handler.
>
>
>
> 2012/2/23 卜弋天 :
> > Hi :
> >
> > for ARM architecture, from the point of my view, interrupt can be
> > handled in IRQ, SVC, or SYSTEM mo
context
> From: c.a.subraman...@gmail.com
> To: bu...@live.cn
> CC: dhyla...@gmail.com; subingangadha...@gmail.com;
> kernelnewbies@kernelnewbies.org
>
> On Thu, Feb 23, 2012 at 6:52 AM, 卜弋天 wrote:
> > Hi Subin:
> >
> > for kernel version 2.6.35, ARM architectu
Hi Subin: for kernel version 2.6.35, ARM architecture, when interrupt
occurs, kernel will change from USER/SVC mode to IRQ mode,backup some registers
and change to SVC mode immediately, handle the real interrupt handler in SVC
mode, which people say in interrupt context.kernel will use
Hi Devendra:can you please tell me your kernel version? SA_INTERRUPT is
deprecated for many years. it is changed to be IRQF_DISABLED, which is also
deprecated since 2.6.35. in kernel 2.6.35, top half interrupt handler will be
called with interrupts disabled, and for SA_SHIRQ, it is
Hi: the SWI is used for system APIs such as open, read, write. user mode
applications call system APIs via SWI, which will change ARM mode from USER to
SVC. so when vector_swi is called, Linux will do as below: 1. store
r0~r12, these registers are universal for USR mode SVC mode.
t cores within a cache coherent SMP system.
> > When compiling a kernel without CONFIG_SMP, all SMP barriers are
> > converted into plain compiler barriers.
> >
> > 2011/12/9 卜弋天 :
> >> Hi :
> >>
> >> memory barriers can not make order on other cpus
Hi :
memory barriers can not make order on other cpus, only the current cpu's
order will be promised.
> Date: Fri, 9 Dec 2011 12:54:40 +0530
> Subject: Memory barrier
> From: trisha1ma...@gmail.com
> To: Kernelnewbies@kernelnewbies.org
>
> Hi All,
>
> I need small clarification
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