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:
| 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 |
| RES0 | |||||||||||||||||||||||||||||||
| RES0 | RXfull | TXfull | RES0 | RAZ | RES0 | RAZ | RES0 | RAZ | RES0 | ||||||||||||||||||||||
| 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 [63:31]
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
| op0 | op1 | CRn | CRm | op2 |
|---|---|---|---|---|
| 0b10 | 0b011 | 0b0000 | 0b0001 | 0b000 |
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;