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MSMON_CSU, MPAM Cache Storage Usage Monitor Register

The MSMON_CSU characteristics are:

Purpose

MSMON_CSU is a 32-bit read-write register that accesses the CSU monitor selected by MSMON_CFG_MON_SEL.

Configuration

The power domain of MSMON_CSU is IMPLEMENTATION DEFINED.

This register is present only when MPAMF_IDR.HAS_MSMON == 1 and MPAMF_MSMON_IDR.MSMON_CSU == 1. Otherwise, direct accesses to MSMON_CSU are IMPLEMENTATION DEFINED.

Attributes

MSMON_CSU is a 32-bit register.

Field descriptions

The MSMON_CSU bit assignments are:

313029282726252423222120191817161514131211109876543210
NRDYVALUE

NRDY, bit [31]

Not Ready. Indicates whether the monitor has possibly inaccurate data.

NRDYMeaning
0b0

The monitor is not ready and the contents of the VALUE field might be inaccurate or otherwise not represent the actual cache storage usage.

0b1

The monitor is ready and the VALUE fields is accurate.

VALUE, bits [30:0]

Cache storage usage value if NRDY == 0. Invalid if NRDY == 1.

VALUE is the cache storage usage in bytes meeting the criteria set in MSMON_CFG_CSU_FLT and MSMON_CFG_CSU_CTL for the monitor instance selected by MSMON_CFG_MON_SEL.

Accessing the MSMON_CSU

This register is part of the MPAMF_BASE memory frame. In a system that supports Secure and Non-secure memory maps, the MPAMF_BASE frame must be accessible in both Secure and Non-secure memory address maps.

MSMON_CSU must be accessible from the Non-secure and Secure address maps.

MSMON_CSU must be banked for the Secure and Non-secure address maps. The Secure instance accesses the cache storage usage monitor used for Secure PARTIDs, and the Non-secure instance accesses the cache storage usage monitor used for Non-secure PARTIDs.

MSMON_CSU can be accessed through the memory-mapped interfaces:

ComponentFrameOffsetInstance
MPAM.anyMPAMF_BASE_s0x0840MSMON_CSU_s

Access on this interface is RW.

ComponentFrameOffsetInstance
MPAM.anyMPAMF_BASE_ns0x0840MSMON_CSU_ns

Access on this interface is RW.



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