hi, apologies for asking a stupid question, tell me how are you guys are testing anything that you are developing. either any changes any linux kernel or something new. Is it some simulator or a VM or directly into some hardware. whats the best practice. any links related to this will be very helpful
thanks --Vinit On Mon, Oct 4, 2010 at 11:58 AM, arshad hussain <[email protected]>wrote: > On 10/2/2010 3:08 AM, Sri Ram Vemulpali wrote: > >> Hi All, >> >> I am developing segmentation for my kernel. In that process I >> choose to divide whole memory in to fixed size segments. So a 4GB >> memory can be divided in to 8192 segments. So I initialize segment >> descriptors in to the GTD withs segments base address and limit. Here >> base address are 0,0x10000,0x20000,..... and limit is 64kb always for >> every segment. For a task if I choose a segment to assign, I will >> place the index of that segment descriptor in to CS, DS. Now when >> process generates address to put on address bus, then it will do >> computation from logical address to linear address. >> After processor picks logical address, it chooses segment descriptor >> and adds this 32-bit logical address to segment base address to >> generate linear address. Now my question is, if my segment size is >> 64kb, how is that 32-bit offset is added to segment base address, >> which is not right. >> > > As you know the limit is the _max_ which a single segment can scale. > IE 32bit or 4GB. Since segments need not have a fix size > > > It should only consider 16-bit offset to add to > > there is a granularity bit which determines the 16bit (1MB) > vs the 32bit. > > > base to generate linear address. How can I tell to my processor to >> choose only 16-bit offset. >> > > the granularity bit if cleared (zero) determines a 16bit address. > > > Does processor drives offset bit width > >> automatically based on limit defined in segment descriptor. >> >> Any insight in to this will help me. please clarify my doubt. Waiting >> for you reply. >> >> Regards, >> Sri. >> >> > Thanks > > > -- > To unsubscribe from this list: send an email with > "unsubscribe kernelnewbies" to [email protected] > Please read the FAQ at http://kernelnewbies.org/FAQ > >
