DAIF

Process state D mask.

D	Meaning
0b0	Watchpoint, Breakpoint, and Software Step exceptions targeted at the current Exception level are not masked.
0b1	Watchpoint, Breakpoint, and Software Step exceptions targeted at the current Exception level are masked.

When the target Exception level of the debug exception is higher than the current Exception level, the exception is not masked by this bit.

The reset behavior of this field is:

On a Warm reset, this field resets to 1.

A, bit [8]

SError exception mask bit.

A	Meaning
0b0	Exception not masked.
0b1	Exception masked.

The reset behavior of this field is:

On a Warm reset, this field resets to 1.

I, bit [7]

IRQ mask bit.

I	Meaning
0b0	Exception not masked.
0b1	Exception masked.

The reset behavior of this field is:

On a Warm reset, this field resets to 1.

F, bit [6]

FIQ mask bit.

F	Meaning
0b0	Exception not masked.
0b1	Exception masked.

The reset behavior of this field is:

On a Warm reset, this field resets to 1.

Bits [5:0]

Accessing DAIF

Accesses to this register use the following encodings in the System register encoding space:

MRS <Xt>, DAIF

op0	op1	CRn	CRm	op2
0b11	0b011	0b0100	0b0010	0b001

if PSTATE.EL == EL0 then if ELIsInHost(EL0) || SCTLR_EL1.UMA == '0' then if EL2Enabled() && HCR_EL2.TGE == '1' then AArch64.SystemAccessTrap(EL2, 0x18); else AArch64.SystemAccessTrap(EL1, 0x18); else X[t, 64] = Zeros(54):PSTATE.<D,A,I,F>:Zeros(6); elsif PSTATE.EL == EL1 then X[t, 64] = Zeros(54):PSTATE.<D,A,I,F>:Zeros(6); elsif PSTATE.EL == EL2 then X[t, 64] = Zeros(54):PSTATE.<D,A,I,F>:Zeros(6); elsif PSTATE.EL == EL3 then X[t, 64] = Zeros(54):PSTATE.<D,A,I,F>:Zeros(6);

MSR DAIF, <Xt>

op0	op1	CRn	CRm	op2
0b11	0b011	0b0100	0b0010	0b001

if PSTATE.EL == EL0 then if ELIsInHost(EL0) || SCTLR_EL1.UMA == '0' then if EL2Enabled() && HCR_EL2.TGE == '1' then AArch64.SystemAccessTrap(EL2, 0x18); else AArch64.SystemAccessTrap(EL1, 0x18); else PSTATE.<D,A,I,F> = X[t, 64]<9:6>; elsif PSTATE.EL == EL1 then PSTATE.<D,A,I,F> = X[t, 64]<9:6>; elsif PSTATE.EL == EL2 then PSTATE.<D,A,I,F> = X[t, 64]<9:6>; elsif PSTATE.EL == EL3 then PSTATE.<D,A,I,F> = X[t, 64]<9:6>;

MSR DAIFSet, #<imm>

op0	op1	CRn	op2
0b00	0b011	0b0100	0b110

MSR DAIFClr, #<imm>

op0	op1	CRn	op2
0b00	0b011	0b0100	0b111

63	62	61	60	59	58	57	56	55	54	53	52	51	50	49	48	47	46	45	44	43	42	41	40	39	38	37	36	35	34	33	32
31	30	29	28	27	26	25	24	23	22	21	20	19	18	17	16	15	14	13	12	11	10	9	8	7	6	5	4	3	2	1	0
RES0
RES0																						D	A	I	F	RES0

DAIF, Interrupt Mask Bits

Purpose

Configuration

Attributes

Field descriptions

Bits [63:10]

D, bit [9]

A, bit [8]

I, bit [7]

F, bit [6]

Bits [5:0]

Accessing DAIF

MRS <Xt>, DAIF

MSR DAIF, <Xt>

MSR DAIFSet, #<imm>

MSR DAIFClr, #<imm>