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MDCCSR_EL0, Monitor DCC Status Register

The MDCCSR_EL0 characteristics are:

Purpose

Read-only register containing control status flags for the DCC.

Configuration

AArch64 System register MDCCSR_EL0 bits [30:29] are architecturally mapped to External register EDSCR[30:29] .

AArch64 System register MDCCSR_EL0 bits [30:29] are architecturally mapped to AArch32 System register DBGDSCRint[30:29] .

Attributes

MDCCSR_EL0 is a 64-bit register.

Field descriptions

The MDCCSR_EL0 bit assignments are:

6362616059585756555453525150494847464544434241403938373635343332
RES0
RES0RXfullTXfullRES0RAZRES0RAZRES0RAZRES0
313029282726252423222120191817161514131211109876543210

Bits [63:31]

Reserved, RES0.

RXfull, bit [30]

DTRRX full. Read-only view of the equivalent bit in the EDSCR.

TXfull, bit [29]

DTRTX full. Read-only view of the equivalent bit in the EDSCR.

Bits [28:19]

Reserved, RES0.

Bits [18:15]

Reserved, RAZ.

Bits [14:13]

Reserved, RES0.

Bit [12]

Reserved, RAZ.

Bits [11:6]

Reserved, RES0.

Bits [5:2]

Reserved, RAZ.

Bits [1:0]

Reserved, RES0.

Accessing the MDCCSR_EL0

Accesses to this register use the following encodings:

MRS <Xt>, MDCCSR_EL0

op0op1CRnCRmop2
0b100b0110b00000b00010b000
if PSTATE.EL == EL0 then
    if !ELUsingAArch32(EL1) && MDSCR_EL1.TDCC == '1' 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.TGE == '1' || MDCR_EL2.<TDE,TDA> != '00') then
        AArch64.SystemAccessTrap(EL2, 0x18);
    elsif HaveEL(EL3) && !ELUsingAArch32(EL3) && MDCR_EL3.TDA == '1' then
        AArch64.SystemAccessTrap(EL3, 0x18);
    else
        return MDCCSR_EL0;
elsif PSTATE.EL == EL1 then
    if EL2Enabled() && !ELUsingAArch32(EL2) && MDCR_EL2.<TDE,TDA> != '00' then
        AArch64.SystemAccessTrap(EL2, 0x18);
    elsif HaveEL(EL3) && !ELUsingAArch32(EL3) && MDCR_EL3.TDA == '1' then
        AArch64.SystemAccessTrap(EL3, 0x18);
    else
        return MDCCSR_EL0;
elsif PSTATE.EL == EL2 then
    if HaveEL(EL3) && !ELUsingAArch32(EL3) && MDCR_EL3.TDA == '1' then
        AArch64.SystemAccessTrap(EL3, 0x18);
    else
        return MDCCSR_EL0;
elsif PSTATE.EL == EL3 then
    return MDCCSR_EL0;
              


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