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();