#
# Copyright (c) 2005 Jakub Jermar
# 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
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# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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#include <arch/context_offset.h>

/**
 * Both context_save_arch() and context_restore_arch() are
 * leaf-optimized procedures. This kind of optimization
 * is very important and prevents any implicit window
 * spill/fill/clean traps in these very core kernel
 * functions.
 */
	
#include <arch/context_offset.h>

.text   

.global context_save_arch
.global context_restore_arch

context_save_arch:
	CONTEXT_SAVE_ARCH_CORE %o0
	retl
	mov 1, %o0		! context_save_arch returns 1

context_restore_arch:
	#
	# Flush all active windows.
	# This is essential, because CONTEXT_LOAD overwrites
	# %sp of CWP - 1 with the value written to %fp of CWP.
	# Flushing all active windows mitigates this problem
	# as CWP - 1 becomes the overlap window.
	#
	flushw
	
	CONTEXT_RESTORE_ARCH_CORE %o0
	retl
	xor %o0, %o0, %o0	! context_restore_arch returns 0