BPIALLIS, Branch Predictor Invalidate All, Inner Shareable
The BPIALLIS characteristics are:
Purpose
Invalidate all entries from branch predictors Inner Shareable.
Configuration
This instruction is present only when AArch32 is supported at any Exception level. Otherwise, direct accesses to BPIALLIS are UNKNOWN.
In an implementation where the branch predictors are architecturally invisible, this instruction can execute as a NOP.
Attributes
BPIALLIS is a 32-bit System instruction.
Field descriptions
BPIALLIS ignores the value in the register specified by the instruction encoding. Software does not have to write a value to the register before issuing this instruction.
Executing the BPIALLIS instruction
The PE ignores the value of <Rt>. Software does not have to write a value to this register before issuing this instruction.
Accesses to this instruction use the following encodings:
MCR{<c>}{<q>} <coproc>, {#}<opc1>, <Rt>, <CRn>, <CRm>{, {#}<opc2>}
| coproc | opc1 | CRn | CRm | opc2 |
|---|---|---|---|---|
| 0b1111 | 0b000 | 0b0111 | 0b0001 | 0b110 |
if PSTATE.EL == EL0 then
UNDEFINED;
elsif PSTATE.EL == EL1 then
if EL2Enabled() && !ELUsingAArch32(EL2) && HSTR_EL2.T7 == '1' then
AArch64.AArch32SystemAccessTrap(EL2, 0x03);
elsif EL2Enabled() && ELUsingAArch32(EL2) && HSTR.T7 == '1' then
AArch32.TakeHypTrapException(0x03);
else
BPIALL();
elsif PSTATE.EL == EL2 then
BPIALL();
elsif PSTATE.EL == EL3 then
BPIALL();