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BPIALL, Branch Predictor Invalidate All
The BPIALL characteristics are:
Purpose
Invalidate all entries from branch predictors.
Configuration
This instruction is present only when AArch32 is supported at any Exception level. Otherwise, direct accesses to BPIALL are UNDEFINED.
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
This instruction has no applicable fields.
The value in the register specified by <Rt> is ignored.
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>}
| coproc | opc1 | CRn | CRm | opc2 |
|---|---|---|---|---|
| 0b1111 | 0b000 | 0b0111 | 0b0101 | 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);
elsif EL2Enabled() && ELUsingAArch32(EL2) && HCR.FB == '1' then
BPIALLIS();
else
BPIALL();
elsif PSTATE.EL == EL2 then
BPIALL();
elsif PSTATE.EL == EL3 then
BPIALL();