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| Rev | Author | Line No. | Line |
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| 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 | |||
| 35 | /* TODO: remove it as soon as there is a scheduler for sun4v. It is here only to make the code compilable/ */ |
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| 36 | |||
| 37 | .global write_to_ag_g6 |
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| 38 | write_to_ag_g6: |
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| 39 | |||
| 40 | .global write_to_ag_g7 |
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| 41 | write_to_ag_g7: |
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| 42 | |||
| 43 | .global write_to_ig_g6 |
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| 44 | write_to_ig_g6: |
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| 45 | |||
| 46 | .global read_from_ag_g7 |
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| 47 | read_from_ag_g7: |
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| 48 | |||
| 3863 | rimsky | 49 | /** Switch to userspace. |
| 50 | * |
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| 51 | * %o0 Userspace entry address. |
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| 52 | * %o1 Userspace stack pointer address. |
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| 53 | * %o2 Userspace address of uarg structure. |
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| 54 | */ |
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| 3743 | rimsky | 55 | .global switch_to_userspace |
| 56 | switch_to_userspace: |
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| 3863 | rimsky | 57 | #if 0 |
| 58 | save %o1, -STACK_WINDOW_SAVE_AREA_SIZE, %sp |
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| 59 | flushw |
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| 60 | wrpr %g0, 0, %cleanwin ! avoid information leak |
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| 3743 | rimsky | 61 | |
| 3863 | rimsky | 62 | mov %i2, %o0 ! uarg |
| 63 | xor %o1, %o1, %o1 ! %o1 is defined to hold pcb_ptr |
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| 64 | ! set it to 0 |
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| 65 | clr %i2 |
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| 66 | clr %i3 |
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| 67 | clr %i4 |
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| 68 | clr %i5 |
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| 69 | clr %i6 |
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| 70 | wrpr %g0, 1, %tl ! enforce mapping via nucleus |
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| 71 | |||
| 72 | rdpr %cwp, %g1 |
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| 73 | wrpr %g1, TSTATE_IE_BIT, %tstate |
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| 74 | wrpr %i0, 0, %tnpc |
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| 75 | |||
| 76 | /* |
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| 77 | * Set primary context according to secondary context. |
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| 78 | * Secondary context has been already installed by |
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| 79 | * higher-level functions. |
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| 80 | */ |
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| 81 | wr %g0, ASI_SECONDARY_CONTEXT_REG, %asi |
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| 82 | ldxa [VA_SECONDARY_CONTEXT_REG] %asi, %g1 |
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| 83 | wr %g0, ASI_PRIMARY_CONTEXT_REG, %asi |
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| 84 | stxa %g1, [VA_PRIMARY_CONTEXT_REG] %asi |
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| 85 | flush %i7 |
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| 86 | |||
| 87 | /* |
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| 88 | * Spills and fills will be handled by the userspace handlers. |
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| 89 | */ |
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| 90 | wrpr %g0, WSTATE_OTHER(0) | WSTATE_NORMAL(1), %wstate |
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| 91 | |||
| 92 | done ! jump to userspace |
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| 93 | #endif |