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CNTVCTSS, Counter-timer Self-Synchronized Virtual Count register

The CNTVCTSS characteristics are:

Purpose

Holds the 64-bit virtual count value. The virtual count value is equal to the physical count value visible in CNTPCT minus the virtual offset visible in CNTVOFF.

Configuration

AArch32 System register CNTVCTSS bits [63:0] are architecturally mapped to AArch64 System register CNTVCTSS_EL0[63:0] .

This register is present only when ARMv8.6-ECV is implemented. Otherwise, direct accesses to CNTVCTSS are UNDEFINED.

All reads to the CNTVCTSS occur in program order relative to reads to CNTVCT or CNTVCTSS.

This register is a self-synchronised view of the CNTVCT counter, and cannot be read speculatively.

Attributes

CNTVCTSS is a 64-bit register.

Field descriptions

The CNTVCTSS bit assignments are:

6362616059585756555453525150494847464544434241403938373635343332
Self-Synchronized Virtual count value
Self-Synchronized Virtual count value
313029282726252423222120191817161514131211109876543210

Bits [63:0]

Self-Synchronized Virtual count value.

Accessing the CNTVCTSS

Accesses to this register use the following encodings:

MRRC{<c>}{<q>} <coproc>, {#}<opc1>, <Rt>, <Rt2>, <CRm>

coprocCRmopc1
0b11110b11100b1001
if PSTATE.EL == EL0 then
    if !ELUsingAArch32(EL1) && !(EL2Enabled() && HCR_EL2.<E2H,TGE> == '11') && CNTKCTL_EL1.EL0VCTEN == '0' then
        if EL2Enabled() && !ELUsingAArch32(EL2) && HCR_EL2.TGE == '1' then
            AArch64.AArch32SystemAccessTrap(EL2, 0x04);
        else
            AArch64.AArch32SystemAccessTrap(EL1, 0x04);
    elsif ELUsingAArch32(EL1) && CNTKCTL.PL0VCTEN == '0' then
        if EL2Enabled() && !ELUsingAArch32(EL2) && HCR_EL2.TGE == '1' then
            AArch64.AArch32SystemAccessTrap(EL2, 0x04);
        elsif EL2Enabled() && ELUsingAArch32(EL2) && HCR.TGE == '1' then
            AArch32.TakeHypTrapException(0x00);
        else
            UNDEFINED;
    elsif EL2Enabled() && !ELUsingAArch32(EL2) && HCR_EL2.<E2H,TGE> == '11' && CNTHCTL_EL2.EL0VCTEN == '0' then
        AArch64.AArch32SystemAccessTrap(EL2, 0x04);
    elsif !ELUsingAArch32(EL1) && !(EL2Enabled() && HCR_EL2.<E2H,TGE> == '11') && CNTHCTL_EL2.EL1TVCT == '1' then
        AArch64.AArch32SystemAccessTrap(EL2, 0x04);
    else
        return CNTVCTSS;
elsif PSTATE.EL == EL1 then
    if !ELUsingAArch32(EL1) && !(EL2Enabled() && HCR_EL2.<E2H,TGE> == '11') && CNTHCTL_EL2.EL1TVCT == '1' then
        AArch64.AArch32SystemAccessTrap(EL2, 0x04);
    else
        return CNTVCTSS;
elsif PSTATE.EL == EL2 then
    return CNTVCTSS;
elsif PSTATE.EL == EL3 then
    return CNTVCTSS;
              


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