You copied the Doc URL to your clipboard.

CNTPCTSS_EL0, Counter-timer Self-Synchronized Physical Count register

The CNTPCTSS_EL0 characteristics are:

Purpose

Holds the self-synchronized view of the 64-bit physical count value.

Configuration

AArch64 System register CNTPCTSS_EL0 bits [63:0] are architecturally mapped to AArch32 System register CNTPCTSS[63:0] .

This register is present only when ARMv8.6-ECV is implemented. Otherwise, direct accesses to CNTPCTSS_EL0 are UNDEFINED.

All reads to the CNTPCTSS_EL0 occur in program order relative to reads to CNTPCT_EL0 or CNTPCTSS_EL0.

This register is a self-synchronised view of the CNTPCT_EL0 counter, and cannot be read speculatively.

Attributes

CNTPCTSS_EL0 is a 64-bit register.

Field descriptions

The CNTPCTSS_EL0 bit assignments are:

6362616059585756555453525150494847464544434241403938373635343332
Self-synchronized physical count value
Self-synchronized physical count value
313029282726252423222120191817161514131211109876543210

Bits [63:0]

Self-synchronized physical count value.

Accessing the CNTPCTSS_EL0

Accesses to this register use the following encodings:

MRS <Xt>, CNTPCTSS_EL0

op0op1CRnCRmop2
0b110b0110b11100b00000b101
if PSTATE.EL == EL0 then
    if !ELUsingAArch32(EL1) && !(EL2Enabled() && HCR_EL2.<E2H,TGE> == '11') && CNTKCTL_EL1.EL0PCTEN == '0' then
        if EL2Enabled() && !ELUsingAArch32(EL2) && HCR_EL2.TGE == '1' then
            AArch64.SystemAccessTrap(EL2, 0x18);
        else
            AArch64.SystemAccessTrap(EL1, 0x18);
    elsif EL2Enabled() && !ELUsingAArch32(EL2) && HCR_EL2.E2H == '0' && CNTHCTL_EL2.EL1PCEN == '0' then
        AArch64.SystemAccessTrap(EL2, 0x18);
    elsif EL2Enabled() && !ELUsingAArch32(EL2) && HCR_EL2.<E2H,TGE> == '10' && CNTHCTL_EL2.EL1PCTEN == '0' then
        AArch64.SystemAccessTrap(EL2, 0x18);
    elsif EL2Enabled() && !ELUsingAArch32(EL2) && HCR_EL2.<E2H,TGE> == '11' && CNTHCTL_EL2.EL0PCTEN == '0' then
        AArch64.SystemAccessTrap(EL2, 0x18);
    else
        return CNTPCTSS_EL0;
elsif PSTATE.EL == EL1 then
    if EL2Enabled() && !ELUsingAArch32(EL2) && CNTHCTL_EL2.EL1PCTEN == '0' then
        AArch64.SystemAccessTrap(EL2, 0x18);
    else
        return CNTPCTSS_EL0;
elsif PSTATE.EL == EL2 then
    return CNTPCTSS_EL0;
elsif PSTATE.EL == EL3 then
    return CNTPCTSS_EL0;
              


Was this page helpful? Yes No