PMOVSR, Performance Monitors Overflow Flag Status Register
The PMOVSR characteristics are:
Purpose
Contains the state of the overflow bit for the Cycle Count Register, PMCCNTR, and each of the implemented event counters PMEVCNTR<n>. Writing to this register clears these bits.
Configuration
AArch32 System register PMOVSR bits [31:0] are architecturally mapped to AArch64 System register PMOVSCLR_EL0[31:0] .
AArch32 System register PMOVSR bits [31:0] are architecturally mapped to External register PMOVSCLR_EL0[31:0] .
This register is in the Warm reset domain. On a Warm or Cold reset RW fields in this register reset to architecturally UNKNOWN values.
Attributes
PMOVSR is a 32-bit register.
Field descriptions
The PMOVSR bit assignments are:
| 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 |
| C | P<n>, bit [n] | ||||||||||||||||||||||||||||||
C, bit [31]
Cycle counter overflow clear bit. Possible values are:
| C | Meaning |
|---|---|
| 0b0 |
When read, means the cycle counter has not overflowed since this bit was last cleared. When written, has no effect. |
| 0b1 |
When read, means the cycle counter has overflowed since this bit was last cleared. When written, clears the cycle counter overflow bit to 0. |
PMCR.LC controls whether an overflow is detected from unsigned overflow of PMCCNTR[31:0] or unsigned overflow of PMCCNTR[63:0].
On a Warm reset, this field resets to an architecturally UNKNOWN value.
P<n>, bit [n], for n = 0 to 30
Event counter overflow clear bit for PMEVCNTR<n>.
If N is less than 31, then bits [30:N] are RAZ/WI. When EL2 is implemented and enabled in the current Security state, in EL1 and EL0, N is the value in MDCR_EL2.HPMN if EL2 is using AArch64, or in HDCR.HPMN if EL2 is using AArch32. Otherwise, N is the value in PMCR.N.
| P<n> | Meaning |
|---|---|
| 0b0 |
When read, means that PMEVCNTR<n> has not overflowed since this bit was last cleared. When written, has no effect. |
| 0b1 |
When read, means that PMEVCNTR<n> has overflowed since this bit was last cleared. When written, clears the PMEVCNTR<n> overflow bit to 0. |
If ARMv8.5-PMU is implemented, MDCR_EL2.HLP, HDCR.HLP, and PMCR.LP control whether an overflow is detected from unsigned overflow of PMEVCNTR<n>[31:0] or unsigned overflow of PMEVCNTR<n>[63:0]. PMEVCNTR<n>[63:32] cannot be accessed directly in AArch32 state.
On a Warm reset, this field resets to an architecturally UNKNOWN value.
Accessing the PMOVSR
Accesses to this register use the following encodings:
MRC{<c>}{<q>} <coproc>, {#}<opc1>, <Rt>, <CRn>, <CRm>{, {#}<opc2>}
| coproc | opc1 | CRn | CRm | opc2 |
|---|---|---|---|---|
| 0b1111 | 0b000 | 0b1001 | 0b1100 | 0b011 |
if PSTATE.EL == EL0 then
if !ELUsingAArch32(EL1) && PMUSERENR_EL0.EN == '0' then
if EL2Enabled() && !ELUsingAArch32(EL2) && HCR_EL2.TGE == '1' then
AArch64.AArch32SystemAccessTrap(EL2, 0x03);
else
AArch64.AArch32SystemAccessTrap(EL1, 0x03);
elsif ELUsingAArch32(EL1) && PMUSERENR.EN == '0' then
if EL2Enabled() && !ELUsingAArch32(EL2) && HCR_EL2.TGE == '1' then
AArch64.AArch32SystemAccessTrap(EL2, 0x03);
elsif EL2Enabled() && ELUsingAArch32(EL2) && HCR.TGE == '1' then
AArch32.TakeHypTrapException(0x00);
else
UNDEFINED;
elsif EL2Enabled() && !ELUsingAArch32(EL2) && HCR_EL2.<E2H,TGE> != '11' && HSTR_EL2.T9 == '1' then
AArch64.AArch32SystemAccessTrap(EL2, 0x03);
elsif EL2Enabled() && ELUsingAArch32(EL2) && HSTR.T9 == '1' then
AArch32.TakeHypTrapException(0x03);
elsif EL2Enabled() && !ELUsingAArch32(EL2) && MDCR_EL2.TPM == '1' then
AArch64.AArch32SystemAccessTrap(EL2, 0x03);
elsif EL2Enabled() && ELUsingAArch32(EL2) && HDCR.TPM == '1' then
AArch32.TakeHypTrapException(0x03);
elsif HaveEL(EL3) && !ELUsingAArch32(EL3) && MDCR_EL3.TPM == '1' then
AArch64.AArch32SystemAccessTrap(EL3, 0x03);
else
return PMOVSR;
elsif PSTATE.EL == EL1 then
if EL2Enabled() && !ELUsingAArch32(EL2) && HSTR_EL2.T9 == '1' then
AArch64.AArch32SystemAccessTrap(EL2, 0x03);
elsif EL2Enabled() && ELUsingAArch32(EL2) && HSTR.T9 == '1' then
AArch32.TakeHypTrapException(0x03);
elsif EL2Enabled() && !ELUsingAArch32(EL2) && MDCR_EL2.TPM == '1' then
AArch64.AArch32SystemAccessTrap(EL2, 0x03);
elsif EL2Enabled() && ELUsingAArch32(EL2) && HDCR.TPM == '1' then
AArch32.TakeHypTrapException(0x03);
elsif HaveEL(EL3) && !ELUsingAArch32(EL3) && MDCR_EL3.TPM == '1' then
AArch64.AArch32SystemAccessTrap(EL3, 0x03);
else
return PMOVSR;
elsif PSTATE.EL == EL2 then
if HaveEL(EL3) && !ELUsingAArch32(EL3) && MDCR_EL3.TPM == '1' then
AArch64.AArch32SystemAccessTrap(EL3, 0x03);
else
return PMOVSR;
elsif PSTATE.EL == EL3 then
return PMOVSR;
MCR{<c>}{<q>} <coproc>, {#}<opc1>, <Rt>, <CRn>, <CRm>{, {#}<opc2>}
| coproc | opc1 | CRn | CRm | opc2 |
|---|---|---|---|---|
| 0b1111 | 0b000 | 0b1001 | 0b1100 | 0b011 |
if PSTATE.EL == EL0 then
if !ELUsingAArch32(EL1) && PMUSERENR_EL0.EN == '0' then
if EL2Enabled() && !ELUsingAArch32(EL2) && HCR_EL2.TGE == '1' then
AArch64.AArch32SystemAccessTrap(EL2, 0x03);
else
AArch64.AArch32SystemAccessTrap(EL1, 0x03);
elsif ELUsingAArch32(EL1) && PMUSERENR.EN == '0' then
if EL2Enabled() && !ELUsingAArch32(EL2) && HCR_EL2.TGE == '1' then
AArch64.AArch32SystemAccessTrap(EL2, 0x03);
elsif EL2Enabled() && ELUsingAArch32(EL2) && HCR.TGE == '1' then
AArch32.TakeHypTrapException(0x00);
else
UNDEFINED;
elsif EL2Enabled() && !ELUsingAArch32(EL2) && HCR_EL2.<E2H,TGE> != '11' && HSTR_EL2.T9 == '1' then
AArch64.AArch32SystemAccessTrap(EL2, 0x03);
elsif EL2Enabled() && ELUsingAArch32(EL2) && HSTR.T9 == '1' then
AArch32.TakeHypTrapException(0x03);
elsif EL2Enabled() && !ELUsingAArch32(EL2) && MDCR_EL2.TPM == '1' then
AArch64.AArch32SystemAccessTrap(EL2, 0x03);
elsif EL2Enabled() && ELUsingAArch32(EL2) && HDCR.TPM == '1' then
AArch32.TakeHypTrapException(0x03);
elsif HaveEL(EL3) && !ELUsingAArch32(EL3) && MDCR_EL3.TPM == '1' then
AArch64.AArch32SystemAccessTrap(EL3, 0x03);
else
PMOVSR = R[t];
elsif PSTATE.EL == EL1 then
if EL2Enabled() && !ELUsingAArch32(EL2) && HSTR_EL2.T9 == '1' then
AArch64.AArch32SystemAccessTrap(EL2, 0x03);
elsif EL2Enabled() && ELUsingAArch32(EL2) && HSTR.T9 == '1' then
AArch32.TakeHypTrapException(0x03);
elsif EL2Enabled() && !ELUsingAArch32(EL2) && MDCR_EL2.TPM == '1' then
AArch64.AArch32SystemAccessTrap(EL2, 0x03);
elsif EL2Enabled() && ELUsingAArch32(EL2) && HDCR.TPM == '1' then
AArch32.TakeHypTrapException(0x03);
elsif HaveEL(EL3) && !ELUsingAArch32(EL3) && MDCR_EL3.TPM == '1' then
AArch64.AArch32SystemAccessTrap(EL3, 0x03);
else
PMOVSR = R[t];
elsif PSTATE.EL == EL2 then
if HaveEL(EL3) && !ELUsingAArch32(EL3) && MDCR_EL3.TPM == '1' then
AArch64.AArch32SystemAccessTrap(EL3, 0x03);
else
PMOVSR = R[t];
elsif PSTATE.EL == EL3 then
PMOVSR = R[t];