ICC_MGRPEN1

This register is present only when EL3 is capable of using AArch32, GICv3 is implemented and EL3 is implemented. Otherwise, direct accesses to ICC_MGRPEN1 are UNDEFINED.

Attributes

Field descriptions

Bits [31:2]

EnableGrp1S, bit [1]

Enables Group 1 interrupts for the Secure state.

EnableGrp1S	Meaning
0b0	Secure Group 1 interrupts are disabled.
0b1	Secure Group 1 interrupts are enabled.

The Secure ICC_IGRPEN1.Enable bit is a read/write alias of the ICC_MGRPEN1.EnableGrp1S bit.

If the highest priority pending interrupt for that PE is a Group 1 interrupt using 1 of N model, then the interrupt will target another PE as a result of the Enable bit changing from 1 to 0.

The reset behavior of this field is:

On a Warm reset, this field resets to 0.

EnableGrp1NS, bit [0]

Enables Group 1 interrupts for the Non-secure state.

EnableGrp1NS	Meaning
0b0	Non-secure Group 1 interrupts are disabled.
0b1	Non-secure Group 1 interrupts are enabled.

The Non-secure ICC_IGRPEN1.Enable bit is a read/write alias of the ICC_MGRPEN1.EnableGrp1NS bit.

If the highest priority pending interrupt for that PE is a Group 1 interrupt using 1 of N model, then the interrupt will target another PE as a result of the Enable bit changing from 1 to 0.

The reset behavior of this field is:

On a Warm reset, this field resets to 0.

Accessing ICC_MGRPEN1

If an interrupt is pending within the CPU interface when an Enable bit becomes 0, the interrupt must be released to allow the Distributor to forward the interrupt to a different PE.

This register is only accessible when executing in Monitor mode.

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

MRC{<c>}{<q>} <coproc>, {#}<opc1>, <Rt>, <CRn>, <CRm>{, {#}<opc2>}

coproc	opc1	CRn	CRm	opc2
0b1111	0b110	0b1100	0b1100	0b111

if PSTATE.EL == EL0 then UNDEFINED; elsif PSTATE.EL == EL1 then if EL2Enabled() && !ELUsingAArch32(EL2) && HSTR_EL2.T12 == '1' then AArch64.AArch32SystemAccessTrap(EL2, 0x03); elsif EL2Enabled() && ELUsingAArch32(EL2) && HSTR.T12 == '1' then AArch32.TakeHypTrapException(0x03); else UNDEFINED; elsif PSTATE.EL == EL2 then UNDEFINED; elsif PSTATE.EL == EL3 then if ICC_MSRE.SRE == '0' then UNDEFINED; else R[t] = ICC_MGRPEN1;

MCR{<c>}{<q>} <coproc>, {#}<opc1>, <Rt>, <CRn>, <CRm>{, {#}<opc2>}

coproc	opc1	CRn	CRm	opc2
0b1111	0b110	0b1100	0b1100	0b111

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																														EnableGrp1S	EnableGrp1NS

ICC_MGRPEN1, Interrupt Controller Monitor Interrupt Group 1 Enable register

Purpose

Configuration