#
# Copyright (c) 2008 Pavel Rimsky
# 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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# - Redistributions in binary form must reproduce the above copyright
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#include <abi/asmtool.h>
#include <arch/mm/mmu.h>
#include <arch/regdef.h>
#include <arch/stack.h>
.text
/** Switch to userspace.
*
* %o0 Userspace entry address.
* %o1 Userspace stack pointer address.
* %o2 Userspace address of uarg structure.
*/
FUNCTION_BEGIN(switch_to_userspace)
save %o1, -(STACK_WINDOW_SAVE_AREA_SIZE + STACK_ARG_SAVE_AREA_SIZE), %sp
flushw
wrpr %g0, 0, %cleanwin ! avoid information leak
mov %i2, %o0 ! uarg
xor %o1, %o1, %o1 ! %o1 is defined to hold pcb_ptr
! set it to 0
clr %i2
clr %i3
clr %i4
clr %i5
clr %i6
wrpr %g0, 1, %tl ! enforce mapping via nucleus
rdpr %cwp, %g1
wrpr %g1, TSTATE_IE_BIT, %tstate
wrpr %i0, 0, %tnpc
/*
* Set primary context according to secondary context.
* Secondary context has been already installed by
* higher-level functions.
*/
wr %g0, ASI_SECONDARY_CONTEXT_REG, %asi
ldxa [VA_SECONDARY_CONTEXT_REG] %asi, %g1
wr %g0, ASI_PRIMARY_CONTEXT_REG, %asi
stxa %g1, [VA_PRIMARY_CONTEXT_REG] %asi
flush %i7
/*
* Spills and fills will be handled by the userspace handlers.
*/
wrpr %g0, WSTATE_OTHER(0) | WSTATE_NORMAL(1), %wstate
done ! jump to userspace
FUNCTION_END(switch_to_userspace)