read_miscreg
val = read_miscreg(ARMADAXP_MISC_PMCGC);
sar_reg = (read_miscreg(ARMADAXP_MISC_SAR_HI) << 31) |
read_miscreg(ARMADAXP_MISC_SAR_LO);
sar = read_miscreg(ARMADAXP_MISC_SAR_LO);