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The POR_EL3 characteristics are:
Stage 1 Permission Overlay Register for privileged access of the EL3 translation regime.
This register is present only when FEAT_S1POE is implemented. Otherwise, direct accesses to POR_EL3 are UNDEFINED.
POR_EL3 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 |
Perm15 | Perm14 | Perm13 | Perm12 | Perm11 | Perm10 | Perm9 | Perm8 | ||||||||||||||||||||||||
Perm7 | Perm6 | Perm5 | Perm4 | Perm3 | Perm2 | Perm1 | Perm0 |
Perm Represents Stage 1 Overlay Permissions.
Perm<m> | Meaning |
---|---|
0b0000 | No access. |
0b0001 | Read. |
0b0010 | Execute. |
0b0011 | Read, Execute. |
0b0100 | Write. |
0b0101 | Write, Read. |
0b0110 | Write, Execute. |
0b0111 | Read, Write, Execute. |
0b1xxx | Reserved - treated as No access |
When VMSAv9-128 is not in use, fields Perm[8] to Perm[15] are not used.
This field is not permitted to be cached in a TLB.
When Stage 1 Overlay mechanism is disabled, this register is ignored.
The reset behavior of this field is:
Accesses to this register use the following encodings in the System register encoding space:
op0 | op1 | CRn | CRm | op2 |
---|---|---|---|---|
0b11 | 0b110 | 0b1010 | 0b0010 | 0b100 |
if PSTATE.EL == EL0 then UNDEFINED; elsif PSTATE.EL == EL1 then UNDEFINED; elsif PSTATE.EL == EL2 then UNDEFINED; elsif PSTATE.EL == EL3 then X[t, 64] = POR_EL3;
op0 | op1 | CRn | CRm | op2 |
---|---|---|---|---|
0b11 | 0b110 | 0b1010 | 0b0010 | 0b100 |
if PSTATE.EL == EL0 then UNDEFINED; elsif PSTATE.EL == EL1 then UNDEFINED; elsif PSTATE.EL == EL2 then UNDEFINED; elsif PSTATE.EL == EL3 then POR_EL3 = X[t, 64];
30/09/2022 15:57; 21c5a6dd0fdaf10a712e2f2d6fffbdbd66d4d96f
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