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| Rev | Author | Line No. | Line |
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| 3743 | rimsky | 1 | # |
| 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 | |||
| 29 | #include <arch/arch.h> |
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| 30 | #include <arch/stack.h> |
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| 31 | #include <arch/mm/sun4u/mmu.h> |
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| 32 | #include <arch/sun4u/regdef.h> |
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| 33 | |||
| 34 | .text |
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| 35 | |||
| 36 | .register %g2, #scratch |
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| 37 | .register %g3, #scratch |
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| 38 | |||
| 39 | .macro WRITE_ALTERNATE_REGISTER reg, bit |
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| 40 | rdpr %pstate, %g1 ! save PSTATE.PEF |
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| 41 | wrpr %g0, (\bit | PSTATE_PRIV_BIT), %pstate |
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| 42 | mov %o0, \reg |
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| 43 | wrpr %g0, PSTATE_PRIV_BIT, %pstate |
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| 44 | retl |
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| 45 | wrpr %g1, 0, %pstate ! restore PSTATE.PEF |
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| 46 | .endm |
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| 47 | |||
| 48 | .macro READ_ALTERNATE_REGISTER reg, bit |
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| 49 | rdpr %pstate, %g1 ! save PSTATE.PEF |
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| 50 | wrpr %g0, (\bit | PSTATE_PRIV_BIT), %pstate |
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| 51 | mov \reg, %o0 |
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| 52 | wrpr %g0, PSTATE_PRIV_BIT, %pstate |
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| 53 | retl |
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| 54 | wrpr %g1, 0, %pstate ! restore PSTATE.PEF |
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| 55 | .endm |
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| 56 | |||
| 57 | .global write_to_ag_g6 |
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| 58 | write_to_ag_g6: |
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| 59 | WRITE_ALTERNATE_REGISTER %g6, PSTATE_AG_BIT |
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| 60 | |||
| 61 | .global write_to_ag_g7 |
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| 62 | write_to_ag_g7: |
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| 63 | WRITE_ALTERNATE_REGISTER %g7, PSTATE_AG_BIT |
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| 64 | |||
| 65 | .global write_to_ig_g6 |
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| 66 | write_to_ig_g6: |
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| 67 | WRITE_ALTERNATE_REGISTER %g6, PSTATE_IG_BIT |
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| 68 | |||
| 69 | .global read_from_ag_g7 |
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| 70 | read_from_ag_g7: |
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| 71 | READ_ALTERNATE_REGISTER %g7, PSTATE_AG_BIT |
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| 72 | |||
| 73 | /** Switch to userspace. |
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| 74 | * |
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| 75 | * %o0 Userspace entry address. |
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| 76 | * %o1 Userspace stack pointer address. |
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| 77 | * %o2 Userspace address of uarg structure. |
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| 78 | */ |
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| 79 | .global switch_to_userspace |
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| 80 | switch_to_userspace: |
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| 81 | save %o1, -STACK_WINDOW_SAVE_AREA_SIZE, %sp |
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| 82 | flushw |
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| 83 | wrpr %g0, 0, %cleanwin ! avoid information leak |
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| 84 | |||
| 85 | mov %i2, %o0 ! uarg |
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| 86 | xor %o1, %o1, %o1 ! %o1 is defined to hold pcb_ptr |
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| 87 | ! set it to 0 |
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| 88 | |||
| 89 | clr %i2 |
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| 90 | clr %i3 |
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| 91 | clr %i4 |
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| 92 | clr %i5 |
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| 93 | clr %i6 |
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| 94 | |||
| 95 | wrpr %g0, 1, %tl ! enforce mapping via nucleus |
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| 96 | |||
| 97 | rdpr %cwp, %g1 |
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| 98 | wrpr %g1, TSTATE_IE_BIT, %tstate |
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| 99 | wrpr %i0, 0, %tnpc |
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| 100 | |||
| 101 | /* |
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| 102 | * Set primary context according to secondary context. |
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| 103 | * Secondary context has been already installed by |
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| 104 | * higher-level functions. |
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| 105 | */ |
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| 106 | wr %g0, ASI_DMMU, %asi |
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| 107 | ldxa [VA_SECONDARY_CONTEXT_REG] %asi, %g1 |
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| 108 | stxa %g1, [VA_PRIMARY_CONTEXT_REG] %asi |
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| 109 | flush %i7 |
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| 110 | |||
| 111 | /* |
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| 112 | * Spills and fills will be handled by the userspace handlers. |
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| 113 | */ |
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| 114 | wrpr %g0, WSTATE_OTHER(0) | WSTATE_NORMAL(1), %wstate |
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| 115 | |||
| 116 | done ! jump to userspace |
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| 117 |