lkml.org 
[lkml]   [2005]   [Jun]   [29]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    /
    Date
    From
    SubjectRe: Handle kernel page faults using task gate

    * Ingo Molnar <mingo@elte.hu> wrote:

    > * eliad lubovsky <eliadl@013.net> wrote:
    >
    > > I am trying to handle page faults exceptions in the kernel using the
    > > task gate mechanism. I succeeded to transfer the execution to my page
    > > fault handler using a new TSS and updates to the GDT and IDT tables
    > > (similar to the double fault mechanism in 2.6). After handling the
    > > fault and allocating the physical page I use the iret instruction to
    > > switch back to the previous task. The problem is that I got a double
    > > fault with the same address that cause the fault (although the
    > > physical page is allocated and mapped). Any clues?
    >
    > are you clearing the 'nested task' (NT) flag of the new TSS once you
    > have switched to it?

    correction - i meant the 'busy' bit in the TSS descriptor. It's being
    set by TSS-switch operations, and needs to be cleared.

    Ingo
    -
    To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
    the body of a message to majordomo@vger.kernel.org
    More majordomo info at http://vger.kernel.org/majordomo-info.html
    Please read the FAQ at http://www.tux.org/lkml/

    \
     
     \ /
      Last update: 2005-06-29 21:33    [W:0.022 / U:94.868 seconds]
    ©2003-2016 Jasper Spaans. hosted at Digital OceanAdvertise on this site