| 1 | #
|
|---|
| 2 | # Copyright (c) 2005 Jakub Jermar
|
|---|
| 3 | # All rights reserved.
|
|---|
| 4 | #
|
|---|
| 5 | # Redistribution and use in source and binary forms, with or without
|
|---|
| 6 | # modification, are permitted provided that the following conditions
|
|---|
| 7 | # are met:
|
|---|
| 8 | #
|
|---|
| 9 | # - Redistributions of source code must retain the above copyright
|
|---|
| 10 | # notice, this list of conditions and the following disclaimer.
|
|---|
| 11 | # - Redistributions in binary form must reproduce the above copyright
|
|---|
| 12 | # notice, this list of conditions and the following disclaimer in the
|
|---|
| 13 | # documentation and/or other materials provided with the distribution.
|
|---|
| 14 | # - The name of the author may not be used to endorse or promote products
|
|---|
| 15 | # derived from this software without specific prior written permission.
|
|---|
| 16 | #
|
|---|
| 17 | # THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
|
|---|
| 18 | # IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
|
|---|
| 19 | # OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
|
|---|
| 20 | # IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
|
|---|
| 21 | # INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
|
|---|
| 22 | # NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
|
|---|
| 23 | # DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
|
|---|
| 24 | # THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
|---|
| 25 | # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
|
|---|
| 26 | # THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|---|
| 27 | #
|
|---|
| 28 |
|
|---|
| 29 | #include <arch/arch.h>
|
|---|
| 30 | #include <arch/stack.h>
|
|---|
| 31 | #include <arch/regdef.h>
|
|---|
| 32 | #include <arch/mm/mmu.h>
|
|---|
| 33 |
|
|---|
| 34 | .text
|
|---|
| 35 |
|
|---|
| 36 | .register %g2, #scratch
|
|---|
| 37 | .register %g3, #scratch
|
|---|
| 38 |
|
|---|
| 39 | .macro WRITE_ALTERNATE_REGISTER reg, bit
|
|---|
| 40 | rdpr %pstate, %g1 ! save PSTATE.PEF
|
|---|
| 41 | wrpr %g0, (\bit | PSTATE_PRIV_BIT), %pstate
|
|---|
| 42 | mov %o0, \reg
|
|---|
| 43 | wrpr %g0, PSTATE_PRIV_BIT, %pstate
|
|---|
| 44 | retl
|
|---|
| 45 | wrpr %g1, 0, %pstate ! restore PSTATE.PEF
|
|---|
| 46 | .endm
|
|---|
| 47 |
|
|---|
| 48 | .macro READ_ALTERNATE_REGISTER reg, bit
|
|---|
| 49 | rdpr %pstate, %g1 ! save PSTATE.PEF
|
|---|
| 50 | wrpr %g0, (\bit | PSTATE_PRIV_BIT), %pstate
|
|---|
| 51 | mov \reg, %o0
|
|---|
| 52 | wrpr %g0, PSTATE_PRIV_BIT, %pstate
|
|---|
| 53 | retl
|
|---|
| 54 | wrpr %g1, 0, %pstate ! restore PSTATE.PEF
|
|---|
| 55 | .endm
|
|---|
| 56 |
|
|---|
| 57 | .global write_to_ag_g6
|
|---|
| 58 | write_to_ag_g6:
|
|---|
| 59 | WRITE_ALTERNATE_REGISTER %g6, PSTATE_AG_BIT
|
|---|
| 60 |
|
|---|
| 61 | .global write_to_ag_g7
|
|---|
| 62 | write_to_ag_g7:
|
|---|
| 63 | WRITE_ALTERNATE_REGISTER %g7, PSTATE_AG_BIT
|
|---|
| 64 |
|
|---|
| 65 | .global write_to_ig_g6
|
|---|
| 66 | write_to_ig_g6:
|
|---|
| 67 | WRITE_ALTERNATE_REGISTER %g6, PSTATE_IG_BIT
|
|---|
| 68 |
|
|---|
| 69 | .global read_from_ag_g7
|
|---|
| 70 | read_from_ag_g7:
|
|---|
| 71 | READ_ALTERNATE_REGISTER %g7, PSTATE_AG_BIT
|
|---|
| 72 |
|
|---|
| 73 | /** Switch to userspace.
|
|---|
| 74 | *
|
|---|
| 75 | * %o0 Userspace entry address.
|
|---|
| 76 | * %o1 Userspace stack pointer address.
|
|---|
| 77 | * %o2 Userspace address of uarg structure.
|
|---|
| 78 | */
|
|---|
| 79 | .global switch_to_userspace
|
|---|
| 80 | switch_to_userspace:
|
|---|
| 81 | save %o1, -(STACK_WINDOW_SAVE_AREA_SIZE + STACK_ARG_SAVE_AREA_SIZE), %sp
|
|---|
| 82 | flushw
|
|---|
| 83 | wrpr %g0, 0, %cleanwin ! avoid information leak
|
|---|
| 84 |
|
|---|
| 85 | mov %i2, %o0 ! uarg
|
|---|
| 86 | xor %o1, %o1, %o1 ! %o1 is defined to hold pcb_ptr
|
|---|
| 87 | ! set it to 0
|
|---|
| 88 |
|
|---|
| 89 | clr %i2
|
|---|
| 90 | clr %i3
|
|---|
| 91 | clr %i4
|
|---|
| 92 | clr %i5
|
|---|
| 93 | clr %i6
|
|---|
| 94 |
|
|---|
| 95 | wrpr %g0, 1, %tl ! enforce mapping via nucleus
|
|---|
| 96 |
|
|---|
| 97 | rdpr %cwp, %g1
|
|---|
| 98 | wrpr %g1, TSTATE_IE_BIT, %tstate
|
|---|
| 99 | wrpr %i0, 0, %tnpc
|
|---|
| 100 |
|
|---|
| 101 | /*
|
|---|
| 102 | * Set primary context according to secondary context.
|
|---|
| 103 | * Secondary context has been already installed by
|
|---|
| 104 | * higher-level functions.
|
|---|
| 105 | */
|
|---|
| 106 | wr %g0, ASI_DMMU, %asi
|
|---|
| 107 | ldxa [VA_SECONDARY_CONTEXT_REG] %asi, %g1
|
|---|
| 108 | stxa %g1, [VA_PRIMARY_CONTEXT_REG] %asi
|
|---|
| 109 | flush %i7
|
|---|
| 110 |
|
|---|
| 111 | /*
|
|---|
| 112 | * Spills and fills will be handled by the userspace handlers.
|
|---|
| 113 | */
|
|---|
| 114 | wrpr %g0, WSTATE_OTHER(0) | WSTATE_NORMAL(1), %wstate
|
|---|
| 115 |
|
|---|
| 116 | done ! jump to userspace
|
|---|
| 117 |
|
|---|
