| 1 | #
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| 2 | # Copyright (c) 2005 Jakub Jermar
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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/arch.h>
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| 31 | #include <arch/stack.h>
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| 32 | #include <arch/regdef.h>
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| 33 | #include <arch/mm/mmu.h>
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| 34 |
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| 35 | .text
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| 36 |
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| 37 | .register %g2, #scratch
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| 38 | .register %g3, #scratch
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| 39 |
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| 40 | .macro WRITE_ALTERNATE_REGISTER reg, bit
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| 41 | rdpr %pstate, %g1 ! save PSTATE.PEF
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| 42 | wrpr %g0, (\bit | PSTATE_PRIV_BIT), %pstate
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| 43 | mov %o0, \reg
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| 44 | wrpr %g0, PSTATE_PRIV_BIT, %pstate
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| 45 | retl
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| 46 | wrpr %g1, 0, %pstate ! restore PSTATE.PEF
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| 47 | .endm
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| 48 |
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| 49 | .macro READ_ALTERNATE_REGISTER reg, bit
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| 50 | rdpr %pstate, %g1 ! save PSTATE.PEF
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| 51 | wrpr %g0, (\bit | PSTATE_PRIV_BIT), %pstate
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| 52 | mov \reg, %o0
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| 53 | wrpr %g0, PSTATE_PRIV_BIT, %pstate
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| 54 | retl
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| 55 | wrpr %g1, 0, %pstate ! restore PSTATE.PEF
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| 56 | .endm
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| 57 |
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| 58 | FUNCTION_BEGIN(write_to_ag_g6)
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| 59 | WRITE_ALTERNATE_REGISTER %g6, PSTATE_AG_BIT
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| 60 | FUNCTION_END(write_to_ag_g6)
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| 61 |
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| 62 | FUNCTION_BEGIN(write_to_ag_g7)
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| 63 | WRITE_ALTERNATE_REGISTER %g7, PSTATE_AG_BIT
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| 64 | FUNCTION_END(write_to_ag_g7)
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| 65 |
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| 66 | FUNCTION_BEGIN(write_to_ig_g6)
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| 67 | WRITE_ALTERNATE_REGISTER %g6, PSTATE_IG_BIT
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| 68 | FUNCTION_END(write_to_ig_g6)
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| 69 |
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| 70 | FUNCTION_BEGIN(read_from_ag_g6)
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| 71 | READ_ALTERNATE_REGISTER %g6, PSTATE_AG_BIT
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| 72 | FUNCTION_END(read_from_ag_g6)
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| 73 |
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| 74 | FUNCTION_BEGIN(read_from_ag_g7)
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| 75 | READ_ALTERNATE_REGISTER %g7, PSTATE_AG_BIT
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| 76 | FUNCTION_END(read_from_ag_g7)
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| 77 |
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| 78 | /** Switch to userspace.
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| 79 | *
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| 80 | * %o0 Userspace entry address.
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| 81 | * %o1 Userspace stack pointer address.
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| 82 | * %o2 Userspace address of uarg structure.
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| 83 | */
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| 84 | FUNCTION_BEGIN(switch_to_userspace)
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| 85 | save %o1, -(STACK_WINDOW_SAVE_AREA_SIZE + STACK_ARG_SAVE_AREA_SIZE), %sp
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| 86 | flushw
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| 87 | wrpr %g0, 0, %cleanwin ! avoid information leak
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| 88 |
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| 89 | mov %i2, %o0 ! uarg
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| 90 | xor %o1, %o1, %o1 ! %o1 is defined to hold pcb_ptr
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| 91 | ! set it to 0
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| 92 |
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| 93 | clr %i2
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| 94 | clr %i3
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| 95 | clr %i4
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| 96 | clr %i5
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| 97 | clr %i6
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| 98 |
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| 99 | wrpr %g0, 1, %tl ! enforce mapping via nucleus
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| 100 |
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| 101 | rdpr %cwp, %g1
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| 102 | wrpr %g1, TSTATE_IE_BIT, %tstate
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| 103 | wrpr %i0, 0, %tnpc
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| 104 |
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| 105 | /*
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| 106 | * Set primary context according to secondary context.
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| 107 | * Secondary context has been already installed by
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| 108 | * higher-level functions.
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| 109 | */
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| 110 | wr %g0, ASI_DMMU, %asi
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| 111 | ldxa [VA_SECONDARY_CONTEXT_REG] %asi, %g1
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| 112 | stxa %g1, [VA_PRIMARY_CONTEXT_REG] %asi
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| 113 | flush %i7
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| 114 |
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| 115 | /*
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| 116 | * Spills and fills will be handled by the userspace handlers.
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| 117 | */
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| 118 | wrpr %g0, WSTATE_OTHER(0) | WSTATE_NORMAL(1), %wstate
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| 119 |
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| 120 | done ! jump to userspace
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| 121 | FUNCTION_END(switch_to_userspace)
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| 122 |
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