arm L_PTE_XXX entry addition for Debugging purpose

[bill4carson]

On 2012年07月30日 17:39, Dhyan wrote:
> Dear All,
>
>  From linux(2.6.35) arm page table architecture i can see we have one
> hardware page table and  there is corresponding Linux page table Entry
> (L_PTE_*).The "Linux" PTE definitions are as like below from
> arch/arm/include/asm/pgtable.h.
>
> |#define L_PTE_PRESENT   (1<<  0)
> #define L_PTE_FILE      (1<<  1)
> #define L_PTE_YOUNG     (1<<  1)
> #define L_PTE_BUFFERABLE(1<<  2)
> #define L_PTE_CACHEABLE (1<<  3)
> #define L_PTE_USER      (1<<  4)
> #define L_PTE_WRITE     (1<<  5)
> #define L_PTE_EXEC      (1<<  6)
> #define L_PTE_DIRTY     (1<<  7)
> #define L_PTE_COHERENT  (1<<  9)
> #define L_PTE_SHARED    (1<<  10)
> |
>
> So is it possible to add one more #|define L_PTE_DEBUG (1 << 11)| for my
> debugging purpose (basically to trap all the write to that page and set
> this bit when write happens and clear it off in another thread   )? Or
> is there any limitation like we can use only L_PTE till 10th bit ?
>

No such limitation on bit 11, so you can use define L_PTE_DEBUG (1 << 11)
However I don't follow why you want to do so?


> So could you please help
>
> --
>
> Thanks & Regards
>
> Dhayn
>
>
>
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-- 
Love each day!

--bill