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CNTPCT_EL0, Counter-timer Physical Count register

The CNTPCT_EL0 characteristics are:

Purpose

Holds the 64-bit physical count value.

Configuration

AArch64 System register CNTPCT_EL0 bits [63:0] are architecturally mapped to AArch32 System register CNTPCT[63:0] .

Attributes

CNTPCT_EL0 is a 64-bit register.

Field descriptions

The CNTPCT_EL0 bit assignments are:

63	62	61	60	59	58	57	56	55	54	53	52	51	50	49	48	47	46	45	44	43	42	41	40	39	38	37	36	35	34	33	32
Physical count value
Physical count value
31	30	29	28	27	26	25	24	23	22	21	20	19	18	17	16	15	14	13	12	11	10	9	8	7	6	5	4	3	2	1	0

Bits [63:0]

Physical count value.

Accessing the CNTPCT_EL0

Accesses to this register use the following encodings:

MRS <Xt>, CNTPCT_EL0

op0	op1	CRn	CRm	op2
0b11	0b011	0b1110	0b0000	0b001

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 CNTPCT_EL0;
elsif PSTATE.EL == EL1 then
    if EL2Enabled() && !ELUsingAArch32(EL2) && CNTHCTL_EL2.EL1PCTEN == '0' then
        AArch64.SystemAccessTrap(EL2, 0x18);
    else
        return CNTPCT_EL0;
elsif PSTATE.EL == EL2 then
    return CNTPCT_EL0;
elsif PSTATE.EL == EL3 then
    return CNTPCT_EL0;

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