| 1 | /*
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| 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 |
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| 29 | /** @addtogroup kernel_sparc64_proc
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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 |
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| 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 |
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| 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 |
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| 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->uspace) {
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| 54 | uint64_t sp;
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| 55 |
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| 56 | /*
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| 57 | * Write kernel stack address to %g6 of the alternate and
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| 58 | * interrupt global sets.
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| 59 | *
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| 60 | * Write pointer to the last item in the userspace window buffer
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| 61 | * to %g7 in the alternate set. Write to the interrupt %g7 is
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| 62 | * not necessary because:
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| 63 | * - spill traps operate only in the alternate global set,
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| 64 | * - preemptible trap handler switches to alternate globals
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| 65 | * before it explicitly uses %g7.
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| 66 | */
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| 67 | sp = (uintptr_t) THREAD->kstack + STACK_SIZE - STACK_BIAS;
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| 68 | write_to_ig_g6(sp);
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| 69 | write_to_ag_g6(sp);
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| 70 | write_to_ag_g7((uintptr_t) THREAD->arch.uspace_window_buffer);
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| 71 | }
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| 72 | }
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| 73 |
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| 74 | /** Perform sparc64 specific steps before a thread stops running. */
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| 75 | void after_thread_ran_arch(void)
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| 76 | {
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| 77 | if (THREAD->uspace) {
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| 78 | /* sample the state of the userspace window buffer */
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| 79 | THREAD->arch.uspace_window_buffer =
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| 80 | (uint8_t *) read_from_ag_g7();
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| 81 | }
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| 82 | }
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| 83 |
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| 84 | /** @}
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| 85 | */
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