| 1 | #
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| 2 | # Copyright (c) 2008 Pavel Rimsky
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| 3 | # All rights reserved.
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| 4 | #
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| 5 | # Redistribution and use in source and binary forms, with or without
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| 6 | # modification, are permitted provided that the following conditions
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| 7 | # are met:
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| 8 | #
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| 9 | # - Redistributions of source code must retain the above copyright
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| 10 | # notice, this list of conditions and the following disclaimer.
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| 11 | # - Redistributions in binary form must reproduce the above copyright
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| 12 | # notice, this list of conditions and the following disclaimer in the
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| 13 | # documentation and/or other materials provided with the distribution.
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| 14 | # - The name of the author may not be used to endorse or promote products
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| 15 | # derived from this software without specific prior written permission.
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| 16 | #
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| 17 | # THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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| 18 | # IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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| 19 | # OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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| 20 | # IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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| 21 | # INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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| 22 | # NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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| 23 | # DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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| 24 | # THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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| 25 | # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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| 26 | # THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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| 27 | #
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| 28 |
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| 29 | #include <abi/asmtool.h>
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| 30 | #include <arch/mm/mmu.h>
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| 31 | #include <arch/regdef.h>
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| 32 | #include <arch/stack.h>
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| 33 |
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| 34 | .text
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| 35 |
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| 36 | /** Switch to userspace.
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| 37 | *
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| 38 | * %o0 Userspace entry address.
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| 39 | * %o1 Userspace stack pointer address.
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| 40 | * %o2 Userspace address of uarg structure.
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| 41 | */
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| 42 | FUNCTION_BEGIN(switch_to_userspace)
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| 43 | save %o1, -(STACK_WINDOW_SAVE_AREA_SIZE + STACK_ARG_SAVE_AREA_SIZE), %sp
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| 44 | flushw
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| 45 | wrpr %g0, 0, %cleanwin ! avoid information leak
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| 46 |
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| 47 | mov %i2, %o0 ! uarg
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| 48 | xor %o1, %o1, %o1 ! %o1 is defined to hold pcb_ptr
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| 49 | ! set it to 0
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| 50 | clr %i2
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| 51 | clr %i3
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| 52 | clr %i4
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| 53 | clr %i5
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| 54 | clr %i6
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| 55 | wrpr %g0, 1, %tl ! enforce mapping via nucleus
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| 56 |
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| 57 | rdpr %cwp, %g1
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| 58 | wrpr %g1, TSTATE_IE_BIT, %tstate
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| 59 | wrpr %i0, 0, %tnpc
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| 60 |
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| 61 | /*
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| 62 | * Set primary context according to secondary context.
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| 63 | * Secondary context has been already installed by
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| 64 | * higher-level functions.
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| 65 | */
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| 66 | wr %g0, ASI_SECONDARY_CONTEXT_REG, %asi
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| 67 | ldxa [VA_SECONDARY_CONTEXT_REG] %asi, %g1
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| 68 | wr %g0, ASI_PRIMARY_CONTEXT_REG, %asi
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| 69 | stxa %g1, [VA_PRIMARY_CONTEXT_REG] %asi
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| 70 | flush %i7
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| 71 |
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| 72 | /*
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| 73 | * Spills and fills will be handled by the userspace handlers.
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| 74 | */
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| 75 | wrpr %g0, WSTATE_OTHER(0) | WSTATE_NORMAL(1), %wstate
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| 76 | done ! jump to userspace
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| 77 | FUNCTION_END(switch_to_userspace)
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