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ARM SMMU versions 1 and 2: Difference between revisions
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→Stream Matching Registers
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* Support for Stream Matching is indicated via SMMU_IDR0.SMS == 1.
* Support for Extended Stream Matching is indicated via SMMU_IDR0.EXSMRGS == 1.
* Enable Extended Stream Matching using SMMU_sCR2.EXSMRGENABLE==1.
** Setting SMMU_SCR2.EXNSSMRGDISABLE==1 with a secure write to SMMU_SCR2 disables the use of Extended Stream Matching by non-secure mode.
* Support for compressed Indexing (which is a subfeature under Stream Matching) is indicated via a secure read of SMMU_IDR2.COMPINDEXS == 1. A non-secure read of this bit only states whether or not compressed indexing is available for use by non-secure software.
* The number of Stream Mapping Register Groups is determined by reading SMMU_IDR0.NUMSMRG.
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