Allows access to the AArch32 DACR register from AArch64 state only. Its value has no effect on execution in AArch64 state.
AArch64 System register DACR32_EL2 bits [31:0] are architecturally mapped to AArch32 System register DACR[31:0].
This register is present only when EL1 is capable of using AArch32. Otherwise, direct accesses to DACR32_EL2 are UNDEFINED.
If EL2 is not implemented but EL3 is implemented, and EL1 is capable of using AArch32, then this register is not RES0.
DACR32_EL2 is a 64-bit register.
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 |
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 |
RES0 | |||||||||||||||||||||||||||||||
D15 | D14 | D13 | D12 | D11 | D10 | D9 | D8 | D7 | D6 | D5 | D4 | D3 | D2 | D1 | D0 |
Reserved, RES0.
Domain n access permission, where n = 0 to 15. Permitted values are:
D<n> | Meaning |
---|---|
0b00 |
No access. Any access to the domain generates a Domain fault. |
0b01 |
Client. Accesses are checked against the permission bits in the translation tables. |
0b11 |
Manager. Accesses are not checked against the permission bits in the translation tables. |
The value 0b10 is reserved.
The reset behavior of this field is:
Accesses to this register use the following encodings in the System register encoding space:
MRS <Xt>, DACR32_EL2
op0 | op1 | CRn | CRm | op2 |
---|---|---|---|---|
0b11 | 0b100 | 0b0011 | 0b0000 | 0b000 |
if !HaveAArch32EL(EL1) then UNDEFINED; elsif PSTATE.EL == EL0 then UNDEFINED; elsif PSTATE.EL == EL1 then if EffectiveHCR_EL2_NVx() IN {'xx1'} then AArch64.SystemAccessTrap(EL2, 0x18); else UNDEFINED; elsif PSTATE.EL == EL2 then X[t, 64] = DACR32_EL2; elsif PSTATE.EL == EL3 then X[t, 64] = DACR32_EL2;
MSR DACR32_EL2, <Xt>
op0 | op1 | CRn | CRm | op2 |
---|---|---|---|---|
0b11 | 0b100 | 0b0011 | 0b0000 | 0b000 |
if !HaveAArch32EL(EL1) then UNDEFINED; elsif PSTATE.EL == EL0 then UNDEFINED; elsif PSTATE.EL == EL1 then if EffectiveHCR_EL2_NVx() IN {'xx1'} then AArch64.SystemAccessTrap(EL2, 0x18); else UNDEFINED; elsif PSTATE.EL == EL2 then DACR32_EL2 = X[t, 64]; elsif PSTATE.EL == EL3 then DACR32_EL2 = X[t, 64];