docs: Add SDEI dispatcher documentation
The document includes SDEI sequence diagrams that are generated using
PlantUML [1].
A shell script is introduced to generate SVG files from PlantUML files
supplied in arguments.
[1] http://plantuml.com/PlantUML_Language_Reference_Guide.pdf
Change-Id: I433897856810bf1927f2800a7b2b1d81827c69b2
Signed-off-by: Jeenu Viswambharan <jeenu.viswambharan@arm.com>
diff --git a/docs/plantuml/plantuml_to_svg.sh b/docs/plantuml/plantuml_to_svg.sh
new file mode 100755
index 0000000..0bf8588
--- /dev/null
+++ b/docs/plantuml/plantuml_to_svg.sh
@@ -0,0 +1,13 @@
+#!/bin/bash
+
+# Convert all PlantUML files in this directory to SVG files. The plantuml_jar
+# environment variable must be set to the path to PlantUML JAR file.
+
+if [ -z "$plantuml_jar" ]; then
+ echo "Usage: plantuml_jar=/path/to/plantuml.jar $0 *.puml" >&2
+ exit 1
+fi
+
+java -jar "$plantuml_jar" -nometadata -tsvg "$@"
+
+# vim:set noet sts=8 tw=80:
diff --git a/docs/plantuml/sdei_explicit_dispatch.puml b/docs/plantuml/sdei_explicit_dispatch.puml
new file mode 100644
index 0000000..51214f5
--- /dev/null
+++ b/docs/plantuml/sdei_explicit_dispatch.puml
@@ -0,0 +1,45 @@
+/'
+ ' Copyright (c) 2017, ARM Limited and Contributors. All rights reserved.
+ '
+ ' SPDX-License-Identifier: BSD-3-Clause
+ '/
+
+@startuml
+
+autonumber "<b>[#]</b>"
+participant "SDEI client" as EL2
+participant EL3
+participant SEL1
+
+activate EL2
+EL2->EL3: **SDEI_EVENT_REGISTER**(ev, handler, ...)
+EL3->EL2: success
+EL2->EL3: **SDEI_EVENT_ENABLE**(ev)
+EL3->EL2: success
+EL2->EL3: **SDEI_PE_UNMASK**()
+EL3->EL2: 1
+
+... <<Business as usual>> ...
+
+EL3<--]: **CRITICAL EVENT**
+activate EL3 #red
+note over EL3: Critical event triage
+EL3->SEL1: dispatch
+activate SEL1 #salmon
+note over SEL1: Critical event handling
+SEL1->EL3: done
+deactivate SEL1
+EL3-->EL3: sdei_dispatch_event(ev)
+note over EL3: Prepare SDEI dispatch
+EL3->EL2: dispatch
+activate EL2 #salmon
+note over EL2: SDEI handler
+EL2->EL3: **SDEI_EVENT_COMPLETE()**
+deactivate EL2
+note over EL3: Complete SDEI dispatch
+EL3->EL2: resumes preempted execution
+deactivate EL3
+
+... <<Normal execution resumes>> ...
+
+@enduml
diff --git a/docs/plantuml/sdei_explicit_dispatch.svg b/docs/plantuml/sdei_explicit_dispatch.svg
new file mode 100644
index 0000000..b33944e
--- /dev/null
+++ b/docs/plantuml/sdei_explicit_dispatch.svg
@@ -0,0 +1 @@
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\ No newline at end of file
diff --git a/docs/plantuml/sdei_general.puml b/docs/plantuml/sdei_general.puml
new file mode 100644
index 0000000..ab6929a
--- /dev/null
+++ b/docs/plantuml/sdei_general.puml
@@ -0,0 +1,43 @@
+/'
+ ' Copyright (c) 2017, ARM Limited and Contributors. All rights reserved.
+ '
+ ' SPDX-License-Identifier: BSD-3-Clause
+ '/
+
+@startuml
+
+autonumber "<b>[#]</b>"
+participant "SDEI client" as EL2
+participant EL3
+participant "SDEI interrupt source" as SDEI
+
+activate EL2
+EL2->EL3: **SDEI_INTERRUPT_BIND**(irq)
+EL3->EL2: event number: ev
+EL2->EL3: **SDEI_EVENT_REGISTER**(ev, handler, ...)
+EL3->EL2: success
+EL2->EL3: **SDEI_EVENT_ENABLE**(ev)
+EL3->EL2: success
+EL2->EL3: **SDEI_PE_UNMASK**()
+EL3->EL2: 1
+
+... <<Business as usual>> ...
+
+SDEI-->EL3: SDEI interrupt
+activate SDEI #salmon
+activate EL3 #red
+note over EL3: Prepare SDEI dispatch
+EL3->EL2: dispatch
+activate EL2 #salmon
+note over EL2: SDEI handler
+EL2->EL3: **SDEI_EVENT_COMPLETE()**
+deactivate EL2
+note over EL3: Complete SDEI dispatch
+EL3-->SDEI: EOI
+deactivate SDEI
+EL3->EL2: resumes preempted execution
+deactivate EL3
+
+... <<Normal execution resumes>> ...
+
+@enduml
diff --git a/docs/plantuml/sdei_general.svg b/docs/plantuml/sdei_general.svg
new file mode 100644
index 0000000..e172112
--- /dev/null
+++ b/docs/plantuml/sdei_general.svg
@@ -0,0 +1 @@
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