windows kernel and user space system process and system threads

[azambajwa]

All

im newbie in windows device driver programming

i have 2 Question about windows adress space

1:- When the terms "user space" and "kernel space" are used, do they refer to

the physical memory of the machine (RAM, actually present) or to the virtual

memory (4 GB on 32-bit machines, just virtual) ?

2:- windows create 4 Gb vitural address space ( 2 Gb for user space and 2 GB for kernel space )

How windows create 4 Gb virtual address even i have only 256MB RAM actually present? as well how windows handle its kernel Direct Mapping to access these addresses?

Regards

Bajwa

[RogueSpear]

You may want to check out this link before you get too far involved in a project making a driver:

http://msdn.microsoft.com/library/default....eviceDriver.asp

[azambajwa]

RogueSpear

ur provided link really informative for me ...... but i have write RAMDISK driver for windows 2000 which is working propely my questions was realated to my new one project ....

RogueSpear thanks alot

ur provided link really informative for me ...... but i have write RAMDISK driver for windows 2000 which is working propely my questions was realated to my new one project ....

[Bâshrat the Sneaky]

Topic moved to Programming.

[LLXX]

1:- When the terms "user space" and "kernel space" are used, do they refer to

the physical memory of the machine (RAM, actually present) or to the virtual

memory (4 GB on 32-bit machines, just virtual) ?

Virtual memory.

2:- windows create 4 Gb vitural address space ( 2 Gb for user space and 2 GB for kernel space )

How windows create 4 Gb virtual address even i have only 256MB RAM actually present? as well how windows handle its kernel Direct Mapping to access these addresses?

Read section on Protected Mode in the IA-32 Intel® Software Developer's Manuals.

[azambajwa]

Bâshrat the Sneaky i couldn't understand to moved topic to programming would u like to explain it

I have written a RAM Disk Driver. This driver works fine in w2k, but you cannot format it in NTFS in winXP . Using the format command line, format says Cannot format a RAM Disk drive.

Has anyone solved this problem ?

[RogueSpear]

I think there is a minimum size necessary for an NTFS partition.

[LLXX]

RAM drives work better as FAT16 since they're not going to be much bigger than 512Mb, and they don't need all the extra features of NTFS since they're transient.