arm-virtualizer: Initial import of v2.1 releasearm_v2.1

From Release_Notes.txt:

ARM Virtualizer software release v2.1

This software release is a v2.1 snapshot of the ARM Virtualizer
software.

The ARM Virtualizer software is example code that demonstrates
cluster context switching capability on a coherent dual cluster
system composed of a Cortex-A7 cluster and a Cortex-A15 cluster.

The intent behind this delivery is to allow inspection of the
software architecture and to demonstrate existing functionality.

It is possible to execute the ARM Virtualizer software on a
Kingfisher Real-Time System Model (RTSM VE Cortex-A15 KF CCI
version 6.2 Beta).

1 files changed, 61 insertions, 0 deletions

diff --git a/big-little/switcher/trigger/handle_switchover.s b/big-little/switcher/trigger/handle_switchover.s
new file mode 100644
index 0000000..d18ba21
--- /dev/null
+++ b/big-little/switcher/trigger/handle_switchover.s
@@ -0,0 +1,61 @@
+	;
+	; Copyright (c) 2011, ARM Limited. All rights reserved.
+	;       
+	; Redistribution and use in source and binary forms, with
+	; or without modification, are permitted provided that the
+	; following conditions are met:
+	;     
+	; Redistributions of source code must retain the above
+	; copyright notice, this list of conditions and the 
+	; following disclaimer.
+	;
+	; Redistributions in binary form must reproduce the
+	; above copyright notice, this list of conditions and 
+	; the following disclaimer in the documentation 
+	; and/or other materials provided with the distribution.
+	;      
+	; Neither the name of ARM nor the names of its
+	; contributors may be used to endorse or promote products
+	; derived from this software without specific prior written
+	; permission.                        
+	; 
+	
+	AREA SwitchoverCode, CODE, READONLY, ALIGN=5
+
+	PRESERVE8
+
+	IMPORT  save_context
+	IMPORT  smc	
+	EXPORT  switch_cluster
+
+SMC_SEC_SHUTDOWN	EQU	0x2
+		
+        ; ----------------------------------------------------	
+	; This function directs the switchover to the inbound
+	; cluster. The context is first saved, stacks switched
+	; & the cluster is powered down.
+	; We need to switch stacks from being resident in normal
+	; WBWA/S memory to SO memory to prevent potential stack
+	; corruption after turning off the C bit in the HSCTLR.
+	; Subsequent accesses will be SO while there will be
+	; valid cache lines of the stack from prior accesses
+        ; ----------------------------------------------------		
+switch_cluster	FUNCTION
+        ; ----------------------------------------------------	
+	; We don't push any registers on the stack as we are
+	; not going to return from this function
+        ; ----------------------------------------------------		
+	MOV	r4, r0
+	BL	save_context
+        ; ----------------------------------------------------	
+	; We are now through with saving the context and the 
+	; inbound cluster has started picking it up. Switch to
+	; the secure world to clean the caches and power down
+	; the cluster
+        ; ----------------------------------------------------			
+	MOV	r0, #SMC_SEC_SHUTDOWN
+	BL	smc
+	ENDFUNC	
+
+	END
+