MVS_CTL
cctl = mr32(MVS_CTL) & 0xFFFF;
mw32_f(MVS_CTL, cctl | CCTL_RST);
cctl = mr32(MVS_CTL);
mw32_f(MVS_CTL, cctl);
tmp = mr32(MVS_CTL);
mw32(MVS_CTL, tmp & ~offs);
tmp = mr32(MVS_CTL);
mw32(MVS_CTL, tmp | offs);
tmp = mr32(MVS_CTL);
mw32(MVS_CTL, tmp & 0xFFFF);
mw32(MVS_CTL, tmp);
cctl = mr32(MVS_CTL) & 0xFFFF;
mw32_f(MVS_CTL, cctl | CCTL_RST);
cctl = mr32(MVS_CTL);
mw32_f(MVS_CTL, cctl);