Segment Register problem on PSIM
joel.sherrill at OARcorp.com
Wed Aug 17 13:56:49 CDT 2011
Check the psim source in gdb. May not be implemented.
Quanming Shi <shiquanming10 at gmail.com> wrote:
>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
> asm volatile("mtsrin %0,%1" : : "r"(val), "r" (va): "memory");
> 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
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