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BPIALL, Branch Predictor Invalidate All
The BPIALL characteristics are:
Purpose
Invalidate all entries from branch predictors.
Configuration
In an implementation where the branch predictors are architecturally invisible, this instruction can execute as a NOP.
Attributes
BPIALL is a 32-bit System instruction.
Field descriptions
BPIALL 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 BPIALL instruction
The PE ignores the value of <Rt>. Software does not have to write a value to this register before issuing this instruction.
When HCR.FB is 1, at Non-secure EL1 this instruction executes as a BPIALLIS.
Accesses to this instruction use the following encodings:
MCR{<c>}{<q>} <coproc>, {#}<opc1>, <Rt>, <CRn>, <CRm>{, {#}<opc2>}
| opc1 | opc2 | CRn | coproc | CRm |
|---|---|---|---|---|
| 0b000 | 0b110 | 0b0111 | 0b1111 | 0b0101 |
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);
elsif EL2Enabled() && ELUsingAArch32(EL2) && HCR.FB == '1' then
BPIALLIS();
else
BPIALL();
elsif PSTATE.EL == EL2 then
BPIALL();
elsif PSTATE.EL == EL3 then
BPIALL();