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;
; 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
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