SCTLR_M
return _arch_mmu_get_sctlr() & SCTLR_M;
sctlr &= ~(SCTLR_M | SCTLR_C | SCTLR_I);
sctlr |= (SCTLR_M | SCTLR_C | SCTLR_I);
& ~(SCTLR_C | SCTLR_M),