IOPGD_SECTION
*iopgd = (pa & IOSECTION_MASK) | prot | IOPGD_SECTION;
#define IOPGD_SUPER (BIT(18) | IOPGD_SECTION)
#define iopgd_is_section(x) (((x) & (1 << 18 | 3)) == IOPGD_SECTION)