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-rw-r--r--man/intel_reg.rst9
1 files changed, 8 insertions, 1 deletions
diff --git a/man/intel_reg.rst b/man/intel_reg.rst
index d1af178a..4ec24c4c 100644
--- a/man/intel_reg.rst
+++ b/man/intel_reg.rst
@@ -103,7 +103,7 @@ Display brief help.
REGISTER REFERENCES
===================
-Registers are defined as [(PORTNAME|PORTNUM|MMIO-OFFSET):](REGNAME|REGADDR).
+Registers are defined as [(PORTNAME|PORTNUM|ENGINE|MMIO-OFFSET):](REGNAME|REGADDR).
PORTNAME
The register access method, most often MMIO, which is the default. The
@@ -120,6 +120,13 @@ PORTNUM
Numbers above 0xff are automatically interpreted as MMIO offsets, not port
numbers.
+ENGINE
+ Instead of cpu based MMIO, specified engine can be used for access method.
+ Batchbuffer will be targeted for the engine to do read/write. The list of
+ available engines is architecture specific and can be found with
+ "intel_reg help". Prefixing engine name with '-' uses non-privileged
+ batchbuffer for access.
+
MMIO-OFFSET
Use MMIO, and add this offset to the register address.