PMOVSCLR

Contains the state of the overflow bit for the Cycle Count Register, PMU.PMCCNTR_EL0, and each of the implemented event counters PMEVCNTR<n>. Writing to this register clears these bits.

Configuration

External register PMOVSCLR_EL0 bits [31:0] are architecturally mapped to AArch64 System register PMOVSCLR_EL0[31:0] when FEAT_PMUv3_EXT32 is implemented and FEAT_PMUv3p9 is not implemented.

External register PMOVSCLR_EL0 bits [31:0] are architecturally mapped to AArch64 System register PMOVSSET_EL0[31:0] when FEAT_PMUv3_EXT32 is implemented and FEAT_PMUv3p9 is not implemented.

External register PMOVSCLR_EL0 bits [63:32] are architecturally mapped to AArch64 System register PMOVSCLR_EL0[63:32] when FEAT_PMUv3_EXT64 is implemented or FEAT_PMUv3p9 is implemented.

External register PMOVSCLR_EL0 bits [63:32] are architecturally mapped to AArch64 System register PMOVSSET_EL0[63:32] when FEAT_PMUv3_EXT64 is implemented or FEAT_PMUv3p9 is implemented.

External register PMOVSCLR_EL0 bits [31:0] are architecturally mapped to AArch32 System register PMOVSSET[31:0].

External register PMOVSCLR_EL0 bits [31:0] are architecturally mapped to AArch32 System register PMOVSR[31:0].

This register is present only when FEAT_PMUv3_EXT is implemented. Otherwise, direct accesses to PMOVSCLR_EL0 are RES0.

Attributes

Field descriptions

When FEAT_PMUv3_EXT64 is implemented, or FEAT_PMUv3p9 is implemented or FEAT_PMUv3_ICNTR is implemented:

Bits [63:33]

F0, bit [32]
When FEAT_PMUv3_ICNTR is implemented:

Unsigned overflow flag for PMU.PMICNTR_EL0 clear. On writes, allows software to clear the unsigned overflow flag for PMU.PMICNTR_EL0 to 0. On reads, returns the unsigned overflow flag for PMU.PMICNTR_EL0.

F0	Meaning
0b0	PMU.PMICNTR_EL0 has not overflowed.
0b1	PMU.PMICNTR_EL0 has overflowed.

The reset behavior of this field is:

On a Warm reset, this field resets to 0.

Accessing this field has the following behavior:

When SoftwareLockStatus(), access to this field is RO.
Otherwise, access to this field is W1C.

Otherwise:

C, bit [31]

Unsigned overflow flag for PMU.PMCCNTR_EL0 clear. On writes, allows software to clear the unsigned overflow flag for PMU.PMCCNTR_EL0 to 0. On reads, returns the unsigned overflow flag for PMU.PMCCNTR_EL0 overflow status.

C	Meaning
0b0	PMU.PMCCNTR_EL0 has not overflowed.
0b1	PMU.PMCCNTR_EL0 has overflowed.

PMU.PMCR_EL0.LC controls whether an overflow is detected from unsigned overflow of PMU.PMCCNTR_EL0[31:0] or unsigned overflow of PMU.PMCCNTR_EL0[63:0].

The reset behavior of this field is:

On a Warm reset, this field resets to an architecturally UNKNOWN value.

Accessing this field has the following behavior:

When SoftwareLockStatus(), access to this field is RO.
Otherwise, access to this field is W1C.

P<m>, bit [m], for m = 30 to 0

Unsigned overflow flag for PMU.PMEVCNTR<m>_EL0 clear. On writes, allows software to clear the unsigned overflow flag for PMU.PMEVCNTR<m>_EL0 to 0. On reads, returns the unsigned overflow flag for PMU.PMEVCNTR<m>_EL0 overflow status.

P<m>	Meaning
0b0	PMU.PMEVCNTR<m>_EL0 has not overflowed.
0b1	PMU.PMEVCNTR<m>_EL0 has overflowed.

If FEAT_PMUv3p5 is implemented, MDCR_EL2.HLP and PMU.PMCR_EL0.LP control whether an overflow is detected from unsigned overflow of PMU.PMEVCNTR<n>_EL0[31:0] or unsigned overflow of PMU.PMEVCNTR<n>_EL0[63:0].

The reset behavior of this field is:

On a Warm reset, this field resets to an architecturally UNKNOWN value.

Accessing this field has the following behavior:

When m >= NUM_PMU_COUNTERS, access to this field is RAZ/WI.
When SoftwareLockStatus(), access to this field is RO.
Otherwise, access to this field is W1C.

Otherwise:

C, bit [31]

C	Meaning
0b0	PMU.PMCCNTR_EL0 has not overflowed.
0b1	PMU.PMCCNTR_EL0 has overflowed.

PMU.PMCR_EL0.LC controls whether an overflow is detected from unsigned overflow of PMU.PMCCNTR_EL0[31:0] or unsigned overflow of PMU.PMCCNTR_EL0[63:0].

The reset behavior of this field is:

On a Warm reset, this field resets to an architecturally UNKNOWN value.

Accessing this field has the following behavior:

When SoftwareLockStatus(), access to this field is RO.
Otherwise, access to this field is W1C.

P<m>, bit [m], for m = 30 to 0

P<m>	Meaning
0b0	PMU.PMEVCNTR<m>_EL0 has not overflowed.
0b1	PMU.PMEVCNTR<m>_EL0 has overflowed.

The reset behavior of this field is:

On a Warm reset, this field resets to an architecturally UNKNOWN value.

Accessing this field has the following behavior:

When m >= NUM_PMU_COUNTERS, access to this field is RAZ/WI.
When SoftwareLockStatus(), access to this field is RO.
Otherwise, access to this field is W1C.

Accessing PMOVSCLR_EL0

Note

SoftwareLockStatus() depends on the type of access attempted and AllowExternalPMUAccess() has a new definition from Armv8.4. Refer to the Pseudocode definitions for more information.

Accesses to this register use the following encodings:

When FEAT_PMUv3_EXT64 is implemented, or FEAT_PMUv3_ICNTR is implemented or FEAT_PMUv3p9 is implemented
[63:0] Accessible at offset 0xC80 from PMU

When DoubleLockStatus(), or !IsCorePowered(), or OSLockStatus() or !AllowExternalPMUAccess(), accesses to this register generate an error response.
When FEAT_PMUv3_EXT32 is implemented and SoftwareLockStatus(), accesses to this register are RO.
Otherwise, accesses to this register are RW.

When FEAT_PMUv3_EXT32 is implemented, FEAT_PMUv3_ICNTR is not implemented and FEAT_PMUv3p9 is not implemented
[31:0] Accessible at offset 0xC80 from PMU

When DoubleLockStatus(), or !IsCorePowered(), or OSLockStatus() or !AllowExternalPMUAccess(), accesses to this register generate an error response.
When SoftwareLockStatus(), accesses to this register are RO.
Otherwise, accesses to this register are RW.

63	62	61	60	59	58	57	56	55	54	53	52	51	50	49	48	47	46	45	44	43	42	41	40	39	38	37	36	35	34	33	32
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
RES0																															F0
C	P30	P29	P28	P27	P26	P25	P24	P23	P22	P21	P20	P19	P18	P17	P16	P15	P14	P13	P12	P11	P10	P9	P8	P7	P6	P5	P4	P3	P2	P1	P0

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	P30	P29	P28	P27	P26	P25	P24	P23	P22	P21	P20	P19	P18	P17	P16	P15	P14	P13	P12	P11	P10	P9	P8	P7	P6	P5	P4	P3	P2	P1	P0

PMOVSCLR_EL0, Performance Monitors Overflow Flag Status Clear register

Purpose

Configuration

Attributes

Field descriptions

When FEAT_PMUv3_EXT64 is implemented, or FEAT_PMUv3p9 is implemented or FEAT_PMUv3_ICNTR is implemented:

Bits [63:33]

F0, bit [32]
When FEAT_PMUv3_ICNTR is implemented:

Otherwise:

C, bit [31]

P<m>, bit [m], for m = 30 to 0

Otherwise:

C, bit [31]

P<m>, bit [m], for m = 30 to 0

Accessing PMOVSCLR_EL0

When FEAT_PMUv3_EXT64 is implemented, or FEAT_PMUv3_ICNTR is implemented or FEAT_PMUv3p9 is implemented
[63:0] Accessible at offset 0xC80 from PMU

When FEAT_PMUv3_EXT32 is implemented, FEAT_PMUv3_ICNTR is not implemented and FEAT_PMUv3p9 is not implemented
[31:0] Accessible at offset 0xC80 from PMU

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	P30	P29	P28	P27	P26	P25	P24	P23	P22	P21	P20	P19	P18	P17	P16	P15	P14	P13	P12	P11	P10	P9	P8	P7	P6	P5	P4	P3	P2	P1	P0

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	P30	P29	P28	P27	P26	P25	P24	P23	P22	P21	P20	P19	P18	P17	P16	P15	P14	P13	P12	P11	P10	P9	P8	P7	P6	P5	P4	P3	P2	P1	P0

PMOVSCLR_EL0, Performance Monitors Overflow Flag Status Clear register

Purpose

Configuration

Attributes

Field descriptions

When FEAT_PMUv3_EXT64 is implemented, or FEAT_PMUv3p9 is implemented or FEAT_PMUv3_ICNTR is implemented:

Bits [63:33]

F0, bit [32]When FEAT_PMUv3_ICNTR is implemented:

Otherwise:

C, bit [31]

P<m>, bit [m], for m = 30 to 0

Otherwise:

C, bit [31]

P<m>, bit [m], for m = 30 to 0

Accessing PMOVSCLR_EL0

When FEAT_PMUv3_EXT64 is implemented, or FEAT_PMUv3_ICNTR is implemented or FEAT_PMUv3p9 is implemented [63:0] Accessible at offset 0xC80 from PMU

When FEAT_PMUv3_EXT32 is implemented, FEAT_PMUv3_ICNTR is not implemented and FEAT_PMUv3p9 is not implemented [31:0] Accessible at offset 0xC80 from PMU

F0, bit [32]
When FEAT_PMUv3_ICNTR is implemented:

When FEAT_PMUv3_EXT64 is implemented, or FEAT_PMUv3_ICNTR is implemented or FEAT_PMUv3p9 is implemented
[63:0] Accessible at offset 0xC80 from PMU

When FEAT_PMUv3_EXT32 is implemented, FEAT_PMUv3_ICNTR is not implemented and FEAT_PMUv3p9 is not implemented
[31:0] Accessible at offset 0xC80 from PMU

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	P30	P29	P28	P27	P26	P25	P24	P23	P22	P21	P20	P19	P18	P17	P16	P15	P14	P13	P12	P11	P10	P9	P8	P7	P6	P5	P4	P3	P2	P1	P0