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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 3743 | rimsky | 1 | # |
| 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 | |||
| 3863 | rimsky | 29 | #include <arch/mm/mmu.h> |
| 30 | #include <arch/regdef.h> |
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| 31 | #include <arch/stack.h> |
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| 32 | |||
| 3743 | rimsky | 33 | .text |
| 34 | |||
| 3863 | rimsky | 35 | /** Switch to userspace. |
| 36 | * |
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| 37 | * %o0 Userspace entry address. |
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| 38 | * %o1 Userspace stack pointer address. |
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| 39 | * %o2 Userspace address of uarg structure. |
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| 40 | */ |
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| 3743 | rimsky | 41 | .global switch_to_userspace |
| 42 | switch_to_userspace: |
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| 4638 | rimsky | 43 | wrpr PSTATE_PRIV_BIT, %pstate |
| 3863 | rimsky | 44 | save %o1, -STACK_WINDOW_SAVE_AREA_SIZE, %sp |
| 45 | flushw |
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| 46 | wrpr %g0, 0, %cleanwin ! avoid information leak |
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| 3743 | rimsky | 47 | |
| 3863 | rimsky | 48 | mov %i2, %o0 ! uarg |
| 49 | xor %o1, %o1, %o1 ! %o1 is defined to hold pcb_ptr |
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| 50 | ! set it to 0 |
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| 51 | clr %i2 |
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| 52 | clr %i3 |
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| 53 | clr %i4 |
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| 54 | clr %i5 |
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| 55 | clr %i6 |
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| 56 | wrpr %g0, 1, %tl ! enforce mapping via nucleus |
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| 57 | |||
| 58 | rdpr %cwp, %g1 |
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| 59 | wrpr %g1, TSTATE_IE_BIT, %tstate |
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| 60 | wrpr %i0, 0, %tnpc |
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| 61 | |||
| 62 | /* |
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| 63 | * Set primary context according to secondary context. |
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| 64 | * Secondary context has been already installed by |
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| 65 | * higher-level functions. |
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| 66 | */ |
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| 67 | wr %g0, ASI_SECONDARY_CONTEXT_REG, %asi |
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| 68 | ldxa [VA_SECONDARY_CONTEXT_REG] %asi, %g1 |
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| 69 | wr %g0, ASI_PRIMARY_CONTEXT_REG, %asi |
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| 70 | stxa %g1, [VA_PRIMARY_CONTEXT_REG] %asi |
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| 71 | flush %i7 |
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| 72 | |||
| 73 | /* |
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| 74 | * Spills and fills will be handled by the userspace handlers. |
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| 75 | */ |
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| 76 | wrpr %g0, WSTATE_OTHER(0) | WSTATE_NORMAL(1), %wstate |
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| 77 | |||
| 78 | done ! jump to userspace |