ARM SMMU versions 1 and 2: Difference between revisions
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The SSD register space, if available, tells the OS which devices are secure vs non-secure. For a secure-mode OS, it allows the OS to set which StreamIDs are secure/non-secure. A Secure-mode OS should set these registers up. A non-secure mode OS may choose to read these registers to determine which devices are under its purvue.
Also, secure mode software may need to prevent access by non-secure software to the global register file of the SMMU. This can be done by setting SMMU_SCR1.GASRAE==1 (Section 2.10.1).
=== StreamIDs ===
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