SBP_L2_SHIFT
#define SBP_L3_SHIFT (SBP_L2_SHIFT + SBP_L2_BITS)
sbpp = sbpm[(ea >> SBP_L2_SHIFT) & (SBP_L2_COUNT - 1)];
spp = spm[(addr >> SBP_L2_SHIFT) & (SBP_L2_COUNT - 1)];
spm += (addr >> SBP_L2_SHIFT) & (SBP_L2_COUNT - 1);