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#

#

# Copyright (c) 2005 Jakub Jermar

# Copyright (c) 2005 Jakub Jermar

# All rights reserved.

# All rights reserved.

#

#

# Redistribution and use in source and binary forms, with or without

# Redistribution and use in source and binary forms, with or without

# modification, are permitted provided that the following conditions

# modification, are permitted provided that the following conditions

# are met:

# are met:

#

#

# - Redistributions of source code must retain the above copyright

# - Redistributions of source code must retain the above copyright

#   notice, this list of conditions and the following disclaimer.

#   notice, this list of conditions and the following disclaimer.

# - Redistributions in binary form must reproduce the above copyright

# - Redistributions in binary form must reproduce the above copyright

#   notice, this list of conditions and the following disclaimer in the

#   notice, this list of conditions and the following disclaimer in the

#   documentation and/or other materials provided with the distribution.

#   documentation and/or other materials provided with the distribution.

# - The name of the author may not be used to endorse or promote products

# - The name of the author may not be used to endorse or promote products

#   derived from this software without specific prior written permission.

#   derived from this software without specific prior written permission.

#

#

# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR

# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR

# IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES

# IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES

# OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.

# OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.

# IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,

# IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,

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# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF

# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF

# THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

# THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

#

#

#include <kernel/arch/context_offset.h>

#include <kernel/arch/context_offset.h>

.text   

.text   

.global context_save

.global context_save

.global context_restore

.global context_restore

context_save:

context_save:

	CONTEXT_SAVE_ARCH_CORE %o0

	CONTEXT_SAVE_ARCH_CORE %o0

	retl

	retl

	mov 1, %o0		! context_save_arch returns 1

	mov 1, %o0		! context_save_arch returns 1

context_restore:

context_restore:

	#

	#

	# Flush all active windows.

	# Flush all active windows.

	# This is essential, because CONTEXT_LOAD overwrites

	# This is essential, because CONTEXT_LOAD overwrites

	# %sp of CWP - 1 with the value written to %fp of CWP.

	# %sp of CWP - 1 with the value written to %fp of CWP.

	# Flushing all active windows mitigates this problem

	# Flushing all active windows mitigates this problem

	# as CWP - 1 becomes the overlap window.

	# as CWP - 1 becomes the overlap window.

	#		

	#		

	flushw

	flushw

	CONTEXT_RESTORE_ARCH_CORE %o0

	CONTEXT_RESTORE_ARCH_CORE %o0

	retl

	retl

	xor %o0, %o0, %o0	! context_restore_arch returns 0

	xor %o0, %o0, %o0	! context_restore_arch returns 0