Segment Register problem on PSIM

[Quanming Shi]

I am working on the MMU protect project of GSOC2011 using the PSIM
environment(Powerpc 6xx).

When I try to set the Ks and Kp bit of SR(segment register), the value never
changed successfully.
I use the  functions defined in spr.h like:
   _write_SR(0, 0x60000000) ;/*I want to set the Ks and Kp bit*/
   _read_SR(0x51000)  ;
the asm actually used  is
   /*write*/
   asm volatile("mtsrin %0,%1" : : "r"(val), "r" (va): "memory");
   /*read*/
    asm volatile("mfsrin %0,%1" : "=r" (val): "r" (va));

when I use these SR functions , the MSR value is 0xa072 (or 0x2042), the
MSR[PR] bit which control the  Privilege level is 0, as expected.

But the return of _read_SR is always 0.  Is there anything I  should notice
when change or get the SR value?

Any feedback will be welcome
Thank you
-- 
Best regards

Quanming Shi
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