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ICC_HPPIR0_EL1, Interrupt Controller Highest Priority Pending Interrupt Register 0

The ICC_HPPIR0_EL1 characteristics are:

Purpose

Indicates the highest priority pending Group 0 interrupt on the CPU interface.

Configuration

AArch64 System register ICC_HPPIR0_EL1 performs the same function as AArch32 System register ICC_HPPIR0.

Attributes

ICC_HPPIR0_EL1 is a 64-bit register.

Field descriptions

The ICC_HPPIR0_EL1 bit assignments are:

6362616059585756555453525150494847464544434241403938373635343332
00000000000000000000000000000000
00000000INTID
313029282726252423222120191817161514131211109876543210

Bits [63:24]

Reserved, RES0.

INTID, bits [23:0]

The INTID of the highest priority pending interrupt, if that interrupt is observable at the current Security state and Exception level.

If the highest priority pending interrupt is not observable, this field contains a special INTID to indicate the reason. These special INTIDs can be one of: 1020, 1021, or 1023. See Special INTIDs, for more information.

This field has either 16 or 24 bits implemented. The number of implemented bits can be found in ICC_CTLR_EL1.IDbits and ICC_CTLR_EL3.IDbits. If only 16 bits are implemented, bits [23:16] of this register are RES0.

Accessing the ICC_HPPIR0_EL1

Accesses to this register use the following encodings:

MRS <Xt>, ICC_HPPIR0_EL1

op0CRnop1op2CRm
0b110b11000b0000b0100b1000
if PSTATE.EL == EL0 then
    UNDEFINED;
elsif PSTATE.EL == EL1 then
    if ICC_SRE_EL1.SRE == '0' then
        AArch64.SystemAccessTrap(EL1, 0x18);
    elsif EL2Enabled() && !ELUsingAArch32(EL2) && ICH_HCR_EL2.TALL0 == '1' then
        AArch64.SystemAccessTrap(EL2, 0x18);
    elsif EL2Enabled() && !ELUsingAArch32(EL2) && HCR_EL2.FMO == '1' then
        return ICV_HPPIR0_EL1;
    elsif HaveEL(EL3) && !ELUsingAArch32(EL3) && SCR_EL3.FIQ == '1' then
        AArch64.SystemAccessTrap(EL3, 0x18);
    else
        return ICC_HPPIR0_EL1;
elsif PSTATE.EL == EL2 then
    if ICC_SRE_EL2.SRE == '0' then
        AArch64.SystemAccessTrap(EL2, 0x18);
    elsif HaveEL(EL3) && !ELUsingAArch32(EL3) && SCR_EL3.FIQ == '1' then
        AArch64.SystemAccessTrap(EL3, 0x18);
    else
        return ICC_HPPIR0_EL1;
elsif PSTATE.EL == EL3 then
    if ICC_SRE_EL3.SRE == '0' then
        AArch64.SystemAccessTrap(EL3, 0x18);
    else
        return ICC_HPPIR0_EL1;
              


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