Hi, while reading one article I came across the following lines: The segment base addresses in segment descriptors (which correspond to segment selector __KERNEL_CS and __KERNEL_DS) are equal to 0; therefore, the logical address offset (in segment:offset format) will be equal to its linear address if either of these segment selectors is used. For *zImage*, CS:EIP is at logical address 10:1000 (linear address 0x1000) now; for * bzImage*, 10:100000 (linear address 0x100000). I have one basic question please help on this: 1.Here CS value 0x10 really means ? 2.why the starting address for zimage different from bzimage .
Thanks, karunakara. 2008/6/23 Steven Zhou <[EMAIL PROTECTED]>: > Thanks for your help. > I think I've got it. > From the programmer's view， we can just see the logical address only. > > The picture > "logical address--->(segmentation) --->linear address--->(paging) > --->physical address" > was processed by kernel and hardware, so user mode programmer does not > care it. He or she just care the logical address, it's enough. > > Please do corret me if I'm wrong. Thanks. > > > On Mon, Jun 23, 2008 at 8:03 PM, Thomas Petazzoni < > [EMAIL PROTECTED]> wrote: > >> Hi, >> >> Le Mon, 23 Jun 2008 06:45:47 -0500, >> "Mayank Kaushik" <[EMAIL PROTECTED]> a écrit : >> >> > Under x86, we have both segmentation and paging. Here's a rough flow: >> > >> > Logical Address (<Segment>:<Offset>) ---> (segmentation)---> Linear >> > address ---> (paging)---> Physical Address. >> >> In Linux, all segments have a size of 4 GB (on x86), which >> means that mostly the convertion between "logical" and "linear" address >> doesn't do anything. >> >> The problem with all these terms "logical", "linear" and "virtual" is >> that everybody uses them with a slightly different meaning. >> >> To make it simple, in Linux you have two different type of addresses: >> >> * physical, from 0 to the size of your physical RAM (I left out the >> peripherals mapped in the physical address space) ; >> >> * virtual, from 0 to 2^32 bits on 32 bits architectures. >> >> The stack address that you see is a virtual address, as are all the >> addresses that you can see in /proc/[pid]/maps. >> >> Sincerly, >> >> Thomas >> -- >> Thomas Petazzoni, Free Electrons >> Kernel, drivers and embedded Linux development, >> consulting, training and support. >> http://free-electrons.com >> > > > > -- > Best Regards.
