Ankit Jain wrote:
hi
well i am not able ot understand this... there are lot many more problems
/proc/iomem 00000000-0009fbff : System RAM 0009fc00-0009ffff : reserved 000a0000-000bffff : Video RAM area 000c0000-000c7fff : Video ROM 000f0000-000fffff : System ROM 00100000-077effff : System RAM 00100000-00250d5b : Kernel code 00250d5c-0034ac43 : Kernel data
this is just a brief..... System RAM what does that
mean? the range can just point 65K of RAM? what about
rest? so what that means?
Okay,
00000000-0009fbff : System RAM
This is the 640 KB that is part of the legacy support for real-mode PC applications.
0009fc00-0009ffff : reserved 000a0000-000bffff : Video RAM area 000c0000-000c7fff : Video ROM 000f0000-000fffff : System ROM
This is the BIOS and VGA address area (up to 1 MB), once again to support real-mode PC stuff (DOS, primarily). The original IBM PC's (I think starting with the XT, maybe the PC) had a 20-bit memory addressing scheme, but only 16-bit registers. If you ever want to hop into the way-back machine to the days of CGA's, hardcards, and 5 1/4" floppies, grab a book on DOS programming - FreeDOS (http://www.freedos.org) is still out there, and it's actually kind of fun to run something that blindingly simple :)
00100000-077effff : System RAM
Here is the rest of your system's memory.
Hard disks are controlled by sending requests to and from the drive for blocks of data. Sort of like reading a book - you only see a couple of pages at a time, but you can access the whole book, or any section of it, by flipping to the right page number. Same way with the hard disk controller. Ask it for sector 11432, and it will give it to you (oversimplified, but essentially correct).also,
on a 32 bit proceesor we can at the most have a access
to 4GB of area as we have that many address space.
well some what it look stupid but then also asking
some where this blunder i have to clear, that how it
access the hard disks which is of much high capacity?
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