On 9/16/2010 11:56 AM, jhoni maux wrote:
HI, Now i'm learn kernel module programming, but i'm still confuse about user space context and kernel space context.
Here I think 'user space context' and 'user space' implies the same thing. anyone know about what
the different between user space and kernel space and how to see the underlaying between user space and kernel space ??
So... In 'Kernel space' the running program can access all the CPU instruction set. While in user space the programs has access to limited CPU instruction. This is accomplished through setting proper privilege bits in the Segment selector and Descriptors. For example 'user space' program cannot issue cli instruction... CPU designers also call 'kernel space' as Ring0. while 'user space' is known as Ring3. Thanks -- To unsubscribe from this list: send an email with "unsubscribe kernelnewbies" to ecartis@xxxxxxxxxxxx Please read the FAQ at http://kernelnewbies.org/FAQ
