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#
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#
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# Copyright (c) 2008 Pavel Rimsky
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# Copyright (c) 2008 Pavel Rimsky
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# All rights reserved.
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# All rights reserved.
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#
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#
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# Redistribution and use in source and binary forms, with or without
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions
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# modification, are permitted provided that the following conditions
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# are met:
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# are met:
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#
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#
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# - Redistributions of source code must retain the above copyright
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# - Redistributions of source code must retain the above copyright
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#   notice, this list of conditions and the following disclaimer.
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#   notice, this list of conditions and the following disclaimer.
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# - Redistributions in binary form must reproduce the above copyright
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# - Redistributions in binary form must reproduce the above copyright
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#   notice, this list of conditions and the following disclaimer in the
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#   notice, this list of conditions and the following disclaimer in the
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#   documentation and/or other materials provided with the distribution.
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#   documentation and/or other materials provided with the distribution.
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# - The name of the author may not be used to endorse or promote products
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# - The name of the author may not be used to endorse or promote products
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#   derived from this software without specific prior written permission.
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#   derived from this software without specific prior written permission.
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#
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#
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# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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# IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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# IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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# OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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# OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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# IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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# IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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# NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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# NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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# THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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# THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#
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#
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#include <arch/mm/mmu.h>
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#include <arch/regdef.h>
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#include <arch/stack.h>
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.text
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.text
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/* TODO: remove it as soon as there is a scheduler for sun4v. It is here only to make the code compilable/ */
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/* TODO: remove it as soon as there is a scheduler for sun4v. It is here only to make the code compilable/ */
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.global write_to_ag_g6
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.global write_to_ag_g6
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write_to_ag_g6:
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write_to_ag_g6:
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.global write_to_ag_g7
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.global write_to_ag_g7
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write_to_ag_g7:
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write_to_ag_g7:
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.global write_to_ig_g6
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.global write_to_ig_g6
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write_to_ig_g6:
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write_to_ig_g6:
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.global read_from_ag_g7
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.global read_from_ag_g7
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read_from_ag_g7:
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read_from_ag_g7:
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/** Switch to userspace.
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 *
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 * %o0	Userspace entry address.
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 * %o1	Userspace stack pointer address.
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 * %o2  Userspace address of uarg structure.
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 */
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.global switch_to_userspace
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.global switch_to_userspace
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switch_to_userspace:
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switch_to_userspace:
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#if 0
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	save %o1, -STACK_WINDOW_SAVE_AREA_SIZE, %sp
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	flushw
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	wrpr %g0, 0, %cleanwin		! avoid information leak
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	mov %i2, %o0			! uarg
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	xor %o1, %o1, %o1		! %o1 is defined to hold pcb_ptr
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					! set it to 0
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	clr %i2
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	clr %i3
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	clr %i4
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	clr %i5
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	clr %i6
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	wrpr %g0, 1, %tl		! enforce mapping via nucleus
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	rdpr %cwp, %g1
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	wrpr %g1, TSTATE_IE_BIT, %tstate
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	wrpr %i0, 0, %tnpc
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	/*
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	 * Set primary context according to secondary context.
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	 * Secondary context has been already installed by
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	 * higher-level functions.
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	 */
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	wr %g0, ASI_SECONDARY_CONTEXT_REG, %asi
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	ldxa [VA_SECONDARY_CONTEXT_REG] %asi, %g1
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	wr %g0, ASI_PRIMARY_CONTEXT_REG, %asi
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	stxa %g1, [VA_PRIMARY_CONTEXT_REG] %asi
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	flush %i7
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	/*
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	 * Spills and fills will be handled by the userspace handlers.
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	 */
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	wrpr %g0, WSTATE_OTHER(0) | WSTATE_NORMAL(1), %wstate
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	done				! jump to userspace
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#endif
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