You copied the Doc URL to your clipboard.

PMSWINC_EL0, Performance Monitors Software Increment register

The PMSWINC_EL0 characteristics are:

Purpose

Increments a counter that is configured to count the Software increment event, event 0x00. For more information, see 'SW_INCR' in the Arm® Architecture Reference Manual, Armv8, for Armv8-A architecture profile, section D5.

Configuration

External register PMSWINC_EL0 bits [31:0] are architecturally mapped to AArch64 System register PMSWINC_EL0[31:0] .

External register PMSWINC_EL0 bits [31:0] are architecturally mapped to AArch32 System register PMSWINC[31:0] .

PMSWINC_EL0 is in the Core power domain.

Implementation of this register is OPTIONAL.

If this register is implemented, use of it is deprecated.

If 1 is written to bit [n] from the external debug interface, it is CONSTRAINED UNPREDICTABLE whether or not a SW_INCR event is created for counter n. This is consistent with not implementing the register in the external debug interface.

Attributes

PMSWINC_EL0 is a 32-bit register.

Field descriptions

The PMSWINC_EL0 bit assignments are:

313029282726252423222120191817161514131211109876543210
RES0P<n>, bit [n]

Bit [31]

Reserved, RES0.

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

Event counter software increment bit for PMEVCNTR<n>_EL0.

If PMCFGR.N is less than 31, bits [30:PMCFGR.N] are WI.

P<n>Meaning
0b0

No action. The write to this bit is ignored.

0b1

It is CONSTRAINED UNPREDICTABLE whether a SW_INCR event is generated for event counter n.

Accessing the PMSWINC_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.

PMSWINC_EL0 can be accessed through the external debug interface:

ComponentOffsetInstance
PMU0xCA0PMSWINC_EL0

This interface is accessible as follows:

  • When IsCorePowered(), !DoubleLockStatus(), !OSLockStatus(), AllowExternalPMUAccess() and SoftwareLockStatus() access to this register is WI.
  • When IsCorePowered(), !DoubleLockStatus(), !OSLockStatus(), AllowExternalPMUAccess() and !SoftwareLockStatus() access to this register is WO.
  • Otherwise access to this register returns an Error.


Was this page helpful? Yes No