CR0_LOW_ADDRESS_PROTECTION_BIT
#define CR0_LOW_ADDRESS_PROTECTION BIT(CR0_LOW_ADDRESS_PROTECTION_BIT)
system_ctl_set_bit(0, CR0_LOW_ADDRESS_PROTECTION_BIT);
local_ctl_clear_bit(0, CR0_LOW_ADDRESS_PROTECTION_BIT);
cr0 = local_ctl_clear_bit(0, CR0_LOW_ADDRESS_PROTECTION_BIT);