The AT S12E0W characteristics are:
Performs stage 1 and 2 address translations, with permissions as if writing to the given virtual address, using the following translation regime:
This System instruction is part of the Address translation instructions functional group.
There are no configuration notes.
AT S12E0W is a 64-bit System instruction.
The AT S12E0W input value 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 |
Input address for translation | |||||||||||||||||||||||||||||||
Input address for translation | |||||||||||||||||||||||||||||||
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 |
Input address for translation. The resulting address can be read from the PAR_EL1.
If the address translation instructions are targeting a translation regime that is using AArch32, and so has a VA of only 32 bits, then VA[63:32] is RES0.
This instruction is executed using AT with the following syntax:
AT <at_op>, <Xt>
This syntax uses the following encoding in the System instruction encoding space:
<at_op> | op0 | op1 | CRn | CRm | op2 |
---|---|---|---|---|---|
S12E0W | 01 | 100 | 0111 | 1000 | 111 |
The instruction is executable as follows:
Control | Accessibility | |||||
---|---|---|---|---|---|---|
E2H | TGE | NS | EL0 | EL1 | EL2 | EL3 |
x | x | 0 | - | - | n/a | WO |
0 | 0 | 1 | - | - | WO | WO |
0 | 1 | 1 | - | n/a | WO | WO |
1 | 0 | 1 | - | - | WO | WO |
1 | 1 | 1 | - | n/a | WO | WO |
This table applies to all syntax that can be used to execute this instruction.
If EL2 is not implemented, or stage 2 translation is disabled, or the instruction is executed at EL3 when the value of SCR_EL3.NS is 0, this instruction executes as AT S1E0W.
For a description of the prioritization of any generated exceptions, see section D1.13.2 (Synchronous exception prioritization) in the ARM® Architecture Reference Manual, ARMv8, for ARMv8-A architecture profile. Subject to the prioritization rules, the following traps and enables are applicable when executing this System instruction.
When EL2 is implemented and is using AArch64 and SCR_EL3.NS==1 && HCR_EL2.E2H==0 :
If HCR_EL2.NV==1, Non-secure execution of this instruction at EL1 is trapped to EL2.
When EL2 is implemented and is using AArch64 and SCR_EL3.NS==1 && HCR_EL2.E2H==1 && HCR_EL2.TGE==0 :
If HCR_EL2.NV==1, Non-secure execution of this instruction at EL1 is trapped to EL2.
28/09/2017 08:24
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