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CNTPS_TVAL_EL1, Counter-timer Physical Secure Timer TimerValue register

The CNTPS_TVAL_EL1 characteristics are:

Purpose

Holds the timer value for the secure physical timer, usually accessible at EL3 but configurably accessible at EL1 in Secure state.

Configuration

There are no configuration notes.

Attributes

CNTPS_TVAL_EL1 is a 64-bit register.

Field descriptions

The CNTPS_TVAL_EL1 bit assignments are:

6362616059585756555453525150494847464544434241403938373635343332
RES0
TimerValue
313029282726252423222120191817161514131211109876543210

Bits [63:32]

Reserved, RES0.

TimerValue, bits [31:0]

The TimerValue view of the secure physical timer.

On a read of this register:

On a write of this register, CNTPS_CVAL_EL1 is set to (CNTPCT_EL0 + TimerValue), where TimerValue is treated as a signed 32-bit integer.

When CNTPS_CTL_EL1.ENABLE is 1, the timer condition is met when (CNTPCT_EL0 - CNTPS_CVAL_EL1) is greater than or equal to zero. This means that TimerValue acts like a 32-bit downcounter timer. When the timer condition is met:

When CNTPS_CTL_EL1.ENABLE is 0, the timer condition is not met, but CNTPCT_EL0 continues to count, so the TimerValue view appears to continue to count down.

On a Warm reset, this field resets to an architecturally UNKNOWN value.

Accessing the CNTPS_TVAL_EL1

Accesses to this register use the following encodings:

MRS <Xt>, CNTPS_TVAL_EL1

op0op1CRnCRmop2
0b110b1110b11100b00100b000
if PSTATE.EL == EL0 then
    UNDEFINED;
elsif PSTATE.EL == EL1 then
    if HaveEL(EL3) && SCR_EL3.NS == '0' then
        if SCR_EL3.EEL2 == '1' then
            UNDEFINED;
        elsif SCR_EL3.ST == '0' then
            AArch64.SystemAccessTrap(EL3, 0x18);
        else
            return CNTPS_TVAL_EL1;
    else
        UNDEFINED;
elsif PSTATE.EL == EL2 then
    UNDEFINED;
elsif PSTATE.EL == EL3 then
    return CNTPS_TVAL_EL1;
              

MSR CNTPS_TVAL_EL1, <Xt>

op0op1CRnCRmop2
0b110b1110b11100b00100b000
if PSTATE.EL == EL0 then
    UNDEFINED;
elsif PSTATE.EL == EL1 then
    if HaveEL(EL3) && SCR_EL3.NS == '0' then
        if SCR_EL3.EEL2 == '1' then
            UNDEFINED;
        elsif SCR_EL3.ST == '0' then
            AArch64.SystemAccessTrap(EL3, 0x18);
        else
            CNTPS_TVAL_EL1 = X[t];
    else
        UNDEFINED;
elsif PSTATE.EL == EL2 then
    UNDEFINED;
elsif PSTATE.EL == EL3 then
    CNTPS_TVAL_EL1 = X[t];