Hi/// On 2/4/08, Peter Teoh <htmldeveloper@xxxxxxxxx> wrote: > Just a few pointers for everyone to look further: > > a. kernel space is (for Intel x86) Ring0, and userspace is Ring3, > and so when u make transition between these two - u are subjected to > HARDWARE control on how the stack space can be used. So Intel manual > (System Programming 3a specifically) is useful to read. Thanks for the clue :) > b. The keyword is "stack switching" (there exists a difference > between 32bit vs 64bit). Look it up - chapter 5 (interrupt and > exception handling). yep, stack plays important role here. > c. Essentially, kernelspace should always be protected from > userspace manipulation, and so the stack registers for userspace is > NOT used in kernelspace. And switch context occurred, the entire > registers set is restored/saved into memory. yep, agree. regards, Mulyadi. -- To unsubscribe from this list: send an email with "unsubscribe kernelnewbies" to ecartis@xxxxxxxxxxxx Please read the FAQ at http://kernelnewbies.org/FAQ
