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| Rev | Author | Line No. | Line |
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| 3993 | rimsky | 1 | /* |
| 2 | * Copyright (c) 2006 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 | /** @addtogroup sparc64proc |
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| 30 | * @{ |
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| 31 | */ |
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| 32 | /** @file |
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| 33 | */ |
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| 34 | |||
| 35 | #include <proc/scheduler.h> |
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| 36 | #include <proc/thread.h> |
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| 37 | #include <arch.h> |
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| 38 | #include <arch/asm.h> |
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| 39 | #include <arch/stack.h> |
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| 40 | |||
| 41 | /** Perform sparc64 specific tasks needed before the new task is run. */ |
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| 42 | void before_task_runs_arch(void) |
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| 43 | { |
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| 44 | } |
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| 45 | |||
| 46 | /** Perform sparc64 specific steps before scheduling a thread. |
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| 47 | * |
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| 48 | * For userspace threads, initialize reserved global registers in the alternate |
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| 49 | * and interrupt sets. |
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| 50 | */ |
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| 51 | void before_thread_runs_arch(void) |
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| 52 | { |
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| 53 | if ((THREAD->flags & THREAD_FLAG_USPACE)) { |
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| 54 | /* |
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| 55 | * Write kernel stack address to %g6 of the alternate and |
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| 56 | * interrupt global sets. |
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| 57 | * |
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| 58 | * Write pointer to the last item in the userspace window buffer |
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| 59 | * to %g7 in the alternate set. Write to the interrupt %g7 is |
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| 60 | * not necessary because: |
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| 61 | * - spill traps operate only in the alternate global set, |
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| 62 | * - preemptible trap handler switches to alternate globals |
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| 63 | * before it explicitly uses %g7. |
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| 64 | */ |
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| 65 | uint64_t sp = (uintptr_t) THREAD->kstack + STACK_SIZE - |
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| 66 | (STACK_BIAS + ALIGN_UP(STACK_ITEM_SIZE, STACK_ALIGNMENT)); |
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| 67 | write_to_ig_g6(sp); |
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| 68 | write_to_ag_g6(sp); |
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| 69 | write_to_ag_g7((uintptr_t) THREAD->arch.uspace_window_buffer); |
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| 70 | } |
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| 71 | } |
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| 72 | |||
| 73 | /** Perform sparc64 specific steps before a thread stops running. */ |
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| 74 | void after_thread_ran_arch(void) |
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| 75 | { |
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| 76 | if ((THREAD->flags & THREAD_FLAG_USPACE)) { |
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| 77 | /* sample the state of the userspace window buffer */ |
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| 78 | THREAD->arch.uspace_window_buffer = (uint8_t *) read_from_ag_g7(); |
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| 79 | } |
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| 80 | } |
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| 81 | |||
| 82 | /** @} |
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| 83 | */ |