The CurrentEL characteristics are:
Holds the current Exception level.
Some or all RW fields of this register have defined reset values. These apply only if the PE resets into an Exception level that is using AArch64. Otherwise, RW fields in this register reset to architecturally UNKNOWN values.
CurrentEL is a 64-bit register.
The CurrentEL 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 | EL | 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 |
Reserved, RES0.
Current Exception level. Possible values of this field are:
EL | Meaning |
---|---|
0b00 |
EL0 |
0b01 |
EL1 |
0b10 |
EL2 |
0b11 |
EL3 |
When the HCR_EL2.NV bit is 1, EL1 read accesses to the CurrentEL register return the value of 0b10 in this field.
This field resets to the highest implemented Exception Level.
Reserved, RES0.
Accesses to this register use the following encodings:
op0 | op1 | CRn | CRm | op2 |
---|---|---|---|---|
0b11 | 0b000 | 0b0100 | 0b0010 | 0b010 |
if PSTATE.EL == EL0 then UNDEFINED; elsif PSTATE.EL == EL1 then return Zeros(60):PSTATE.EL:Zeros(2); elsif PSTATE.EL == EL2 then return Zeros(60):PSTATE.EL:Zeros(2); elsif PSTATE.EL == EL3 then return Zeros(60):PSTATE.EL:Zeros(2);
12/01/2022 09:56; 05a4944b4b04e7ab50def8c126b479d22136f35b
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