ALLINT | Jon's Arm Reference

This register is present only when FEAT_NMI is implemented. Otherwise, direct accesses to ALLINT are UNDEFINED.

Attributes

Field descriptions

Bits [63:14]

ALLINT, bit [13]

All interrupt mask. An interrupt is controlled by PSTATE.ALLINT when all of the following apply:

SCTLR_ELx.NMI is 1.
The interrupt is targeted at ELx.
Execution is at ELx.

ALLINT	Meaning
0b0	This control does not cause any interrupts to be masked.
0b1	If SCTLR_ELx.NMI is 1 and execution is at ELx, an IRQ or FIQ interrupt that is targeted to ELx, with or without Superpriority, is masked.

The value of this bit is set to the inverse value in the SCTLR_ELx.SPINTMASK field on taking an exception to ELx.

The reset behavior of this field is:

On a Warm reset, this field resets to an architecturally UNKNOWN value.

Bits [12:0]

Accessing ALLINT

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

MRS <Xt>, ALLINT

op0	op1	CRn	CRm	op2
0b11	0b000	0b0100	0b0011	0b000

if PSTATE.EL == EL0 then UNDEFINED; elsif PSTATE.EL == EL1 then X[t, 64] = Zeros(50):PSTATE.ALLINT:Zeros(13); elsif PSTATE.EL == EL2 then X[t, 64] = Zeros(50):PSTATE.ALLINT:Zeros(13); elsif PSTATE.EL == EL3 then X[t, 64] = Zeros(50):PSTATE.ALLINT:Zeros(13);

MSR ALLINT, <Xt>

op0	op1	CRn	CRm	op2
0b11	0b000	0b0100	0b0011	0b000

if PSTATE.EL == EL0 then UNDEFINED; elsif PSTATE.EL == EL1 then if EL2Enabled() && IsHCRXEL2Enabled() && HCRX_EL2.TALLINT == '1' then AArch64.SystemAccessTrap(EL2, 0x18); else PSTATE.ALLINT = X[t, 64]<13>; elsif PSTATE.EL == EL2 then PSTATE.ALLINT = X[t, 64]<13>; elsif PSTATE.EL == EL3 then PSTATE.ALLINT = X[t, 64]<13>;

MSR ALLINT, #<imm>

op0	op1	CRn	CRm	op2
0b00	0b001	0b0100	0b000x	0b000

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																		ALLINT	RES0

ALLINT: All Interrupt Mask Bit