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CurrentEL, Current Exception Level

The CurrentEL characteristics are:

Purpose

Holds the current Exception level.

Configuration

There are no configuration notes.

Attributes

CurrentEL is a 64-bit register.

Field descriptions

The CurrentEL bit assignments are:

6362616059585756555453525150494847464544434241403938373635343332
RES0
RES0ELRES0
313029282726252423222120191817161514131211109876543210

Bits [63:4]

Reserved, RES0.

EL, bits [3:2]

Current Exception level. Possible values of this field are:

ELMeaning
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.

Bits [1:0]

Reserved, RES0.

Accessing the CurrentEL

Accesses to this register use the following encodings:

MRS <Xt>, CurrentEL

op0op1CRnCRmop2
0b110b0000b01000b00100b010
if PSTATE.EL == EL0 then
    UNDEFINED;
elsif PSTATE.EL == EL1 then
    if EL2Enabled() && HCR_EL2.NV == '1' then
        return Zeros(60):'10':Zeros(2);
    else
        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);