Steven Liu wrote:
> Hi All:
>
> I am working on the porting Linux to mips R3000 and have a problem
> about sti( ) which is called in start_kernel( ).
>
> As we know, sti() is defined as __sti( ) in the
> include/asm-mips/system.h:
>
> extern __inline__ void __sti(void)
> {
> __asm__ __volatile__(
> ".set\tnoreorder\n\t"
> ".set\tnoat\n\t"
> "mfc0\t$1,$12\n\t"
> "ori\t$1,0x1f\n\t"
> "xori\t$1,0x1e\n\t"
> "mtc0\t$1,$12\n\t" /* <----- problem here
> ! */
Here should follow some nop's on a MIPS I system to make sure $12
is written (why is noreorder used here?).
> ".set\tat\n\t"
> ".set\treorder"
> : /* no outputs */
> : /* no inputs */
> : "$1", "memory");
> }
HTH,
Thiemo
