MTRR_K6_ADDR_SHIFT
mtrrp->len = ffs(mask) << MTRR_K6_ADDR_SHIFT;
for (bit = ffs(mtrrp->len >> MTRR_K6_ADDR_SHIFT) - 1, mask = 0;
#define MTRR_K6_ADDR (0x7fffU << MTRR_K6_ADDR_SHIFT)