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ICC_IGRPEN0, Interrupt Controller Interrupt Group 0 Enable register

The ICC_IGRPEN0 characteristics are:

Purpose

Controls whether Group 0 interrupts are enabled or not.

Configuration

AArch32 System register ICC_IGRPEN0 bits [31:0] are architecturally mapped to AArch64 System register ICC_IGRPEN0_EL1[31:0] .

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

ICC_IGRPEN0 is a 32-bit register.

Field descriptions

The ICC_IGRPEN0 bit assignments are:

313029282726252423222120191817161514131211109876543210
RES0Enable

Bits [31:1]

Reserved, RES0.

Enable, bit [0]

Enables Group 0 interrupts.

EnableMeaning
0b0

Group 0 interrupts are disabled.

0b1

Group 0 interrupts are enabled.

Virtual accesses to this register update ICH_VMCR.VENG0.

This field resets to 0.

Accessing the ICC_IGRPEN0

The lowest Exception level at which this register can be accessed is governed by the Exception level to which FIQ is routed. This routing depends on SCR.FIQ, SCR.NS and HCR.FMO.

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

Accesses to this register use the following encodings:

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

coprocopc1CRnCRmopc2
0b11110b0000b11000b11000b110
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);
    elsif ICC_SRE.SRE == '0' then
        UNDEFINED;
    elsif EL2Enabled() && !ELUsingAArch32(EL2) && ICH_HCR_EL2.TALL0 == '1' then
        AArch64.AArch32SystemAccessTrap(EL2, 0x03);
    elsif EL2Enabled() && ELUsingAArch32(EL2) && ICH_HCR.TALL0 == '1' then
        AArch32.TakeHypTrapException(0x03);
    elsif EL2Enabled() && !ELUsingAArch32(EL2) && HCR_EL2.FMO == '1' then
        return ICV_IGRPEN0;
    elsif EL2Enabled() && !ELUsingAArch32(EL2) && HCR.FMO == '1' then
        return ICV_IGRPEN0;
    elsif HaveEL(EL3) && !ELUsingAArch32(EL3) && SCR_EL3.FIQ == '1' then
        AArch64.AArch32SystemAccessTrap(EL3, 0x03);
    elsif HaveEL(EL3) && ELUsingAArch32(EL3) && PSTATE.M != M32_Monitor && SCR.FIQ == '1' then
        AArch32.TakeMonitorTrapException();
    else
        return ICC_IGRPEN0;
elsif PSTATE.EL == EL2 then
    if ICC_HSRE.SRE == '0' then
        UNDEFINED;
    elsif HaveEL(EL3) && !ELUsingAArch32(EL3) && SCR_EL3.FIQ == '1' then
        AArch64.AArch32SystemAccessTrap(EL3, 0x03);
    elsif HaveEL(EL3) && ELUsingAArch32(EL3) && SCR.FIQ == '1' then
        AArch32.TakeMonitorTrapException();
    else
        return ICC_IGRPEN0;
elsif PSTATE.EL == EL3 then
    if ICC_MSRE.SRE == '0' then
        UNDEFINED;
    else
        return ICC_IGRPEN0;
              

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

coprocopc1CRnCRmopc2
0b11110b0000b11000b11000b110
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);
    elsif ICC_SRE.SRE == '0' then
        UNDEFINED;
    elsif EL2Enabled() && !ELUsingAArch32(EL2) && ICH_HCR_EL2.TALL0 == '1' then
        AArch64.AArch32SystemAccessTrap(EL2, 0x03);
    elsif EL2Enabled() && ELUsingAArch32(EL2) && ICH_HCR.TALL0 == '1' then
        AArch32.TakeHypTrapException(0x03);
    elsif EL2Enabled() && !ELUsingAArch32(EL2) && HCR_EL2.FMO == '1' then
        ICV_IGRPEN0 = R[t];
    elsif EL2Enabled() && !ELUsingAArch32(EL2) && HCR.FMO == '1' then
        ICV_IGRPEN0 = R[t];
    elsif HaveEL(EL3) && !ELUsingAArch32(EL3) && SCR_EL3.FIQ == '1' then
        AArch64.AArch32SystemAccessTrap(EL3, 0x03);
    elsif HaveEL(EL3) && ELUsingAArch32(EL3) && PSTATE.M != M32_Monitor && SCR.FIQ == '1' then
        AArch32.TakeMonitorTrapException();
    else
        ICC_IGRPEN0 = R[t];
elsif PSTATE.EL == EL2 then
    if ICC_HSRE.SRE == '0' then
        UNDEFINED;
    elsif HaveEL(EL3) && !ELUsingAArch32(EL3) && SCR_EL3.FIQ == '1' then
        AArch64.AArch32SystemAccessTrap(EL3, 0x03);
    elsif HaveEL(EL3) && ELUsingAArch32(EL3) && SCR.FIQ == '1' then
        AArch32.TakeMonitorTrapException();
    else
        ICC_IGRPEN0 = R[t];
elsif PSTATE.EL == EL3 then
    if ICC_MSRE.SRE == '0' then
        UNDEFINED;
    else
        ICC_IGRPEN0 = R[t];
              


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