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ICH_LR<n>, Interrupt Controller List Registers, n = 0 - 15

The ICH_LR<n> characteristics are:

Purpose

Provides interrupt context information for the virtual CPU interface.

Configuration

AArch32 System register ICH_LR<n> bits [31:0] are architecturally mapped to AArch64 System register ICH_LR<n>_EL2[31:0] .

If EL2 is not implemented, this register is RES0 from EL3.

If list register n is not implemented, then accesses to this register are UNDEFINED.

Some or all RW fields of this register have defined reset values. These apply only if the PE resets into an Exception level that is using AArch32. Otherwise, RW fields in this register reset to architecturally UNKNOWN values.

Attributes

ICH_LR<n> is a 32-bit register.

Field descriptions

The ICH_LR<n> bit assignments are:

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
vINTID

vINTID, bits [31:0]

Virtual INTID of the interrupt.

If the value of vINTID is 1020-1023 and ICH_LRC<n>.State!=0b00 (Inactive), behavior is UNPREDICTABLE.

Behavior is UNPREDICTABLE if two or more List Registers specify the same vINTID when:

ICH_LRC<n>.State == 01.
ICH_LRC<n>.State == 10.
ICH_LRC<n>.State == 11.

It is IMPLEMENTATION DEFINED how many bits are implemented, though at least 16 bits must be implemented. Unimplemented bits are RES0. The number of implemented bits can be discovered from ICH_VTR.IDbits.

Note

When a VM is using memory-mapped access to the GIC, software must ensure that the correct source PE ID is provided in bits[12:10].

This field resets to 0.

Accessing the ICH_LR<n>

ICH_LR<n> and ICH_LRC<n> can be updated independently.

Accesses to this register use the following encodings:

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

coproc	opc1	CRn	CRm	opc2
0b1111	0b100	0b1100	0b110:n[3]	n[2:0]

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
    if ICC_HSRE.SRE == '0' then
        UNDEFINED;
    else
        return ICH_LR[UInt(CRm<0>:opc2<2:0>)];
elsif PSTATE.EL == EL3 then
    if ICC_MSRE.SRE == '0' then
        UNDEFINED;
    else
        return ICH_LR[UInt(CRm<0>:opc2<2:0>)];

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

coproc	opc1	CRn	CRm	opc2
0b1111	0b100	0b1100	0b110:n[3]	n[2:0]

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
    if ICC_HSRE.SRE == '0' then
        UNDEFINED;
    else
        ICH_LR[UInt(CRm<0>:opc2<2:0>)] = R[t];
elsif PSTATE.EL == EL3 then
    if ICC_MSRE.SRE == '0' then
        UNDEFINED;
    else
        ICH_LR[UInt(CRm<0>:opc2<2:0>)] = R[t];

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