> + /* Check if the processor is running in 32 bit mode, using > + * only 32 bit instructions which should be safe on 32 and > + * 64 bit processors. > + * > + * Subtract the bottom 32 bits of MSR from the full value > + * recording the result. Since MSR[SF] is in the high word, > + * the result will be not-equal iff in 32 bit mode (either > + * the processor is a 32 bit processor or MSR[SF] = 0). > + */
The other way around -- the processor is 64-bit and MSR[SF]=1. Great trick btw! :-) > + mfmsr r0 /* grab whole msr */ > + rlwinm r8,r0,0,0,31 /* extract bottom word */ > + subf. r8,r8,r0 /* subtract, same? */ > + beq 0f /* yes: we are 32 bit mode */ The code is fine though. Segher _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@ozlabs.org https://ozlabs.org/mailman/listinfo/linuxppc-dev
