| 1 | /*
|
|---|
| 2 | * Copyright (c) 2006 Jakub Jermar
|
|---|
| 3 | * All rights reserved.
|
|---|
| 4 | *
|
|---|
| 5 | * Redistribution and use in source and binary forms, with or without
|
|---|
| 6 | * modification, are permitted provided that the following conditions
|
|---|
| 7 | * are met:
|
|---|
| 8 | *
|
|---|
| 9 | * - Redistributions of source code must retain the above copyright
|
|---|
| 10 | * notice, this list of conditions and the following disclaimer.
|
|---|
| 11 | * - Redistributions in binary form must reproduce the above copyright
|
|---|
| 12 | * notice, this list of conditions and the following disclaimer in the
|
|---|
| 13 | * documentation and/or other materials provided with the distribution.
|
|---|
| 14 | * - The name of the author may not be used to endorse or promote products
|
|---|
| 15 | * derived from this software without specific prior written permission.
|
|---|
| 16 | *
|
|---|
| 17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
|
|---|
| 18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
|
|---|
| 19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
|
|---|
| 20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
|
|---|
| 21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
|
|---|
| 22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
|
|---|
| 23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
|
|---|
| 24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
|---|
| 25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
|
|---|
| 26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|---|
| 27 | */
|
|---|
| 28 |
|
|---|
| 29 | /** @addtogroup kernel_sparc64_proc
|
|---|
| 30 | * @{
|
|---|
| 31 | */
|
|---|
| 32 | /** @file
|
|---|
| 33 | */
|
|---|
| 34 |
|
|---|
| 35 | #include <proc/scheduler.h>
|
|---|
| 36 | #include <proc/thread.h>
|
|---|
| 37 | #include <arch.h>
|
|---|
| 38 | #include <arch/asm.h>
|
|---|
| 39 | #include <arch/stack.h>
|
|---|
| 40 |
|
|---|
| 41 | /** Perform sparc64 specific tasks needed before the new task is run. */
|
|---|
| 42 | void before_task_runs_arch(void)
|
|---|
| 43 | {
|
|---|
| 44 | }
|
|---|
| 45 |
|
|---|
| 46 | /** Perform sparc64 specific steps before scheduling a thread.
|
|---|
| 47 | *
|
|---|
| 48 | * For userspace threads, initialize reserved global registers in the alternate
|
|---|
| 49 | * and interrupt sets.
|
|---|
| 50 | */
|
|---|
| 51 | void before_thread_runs_arch(void)
|
|---|
| 52 | {
|
|---|
| 53 | if (THREAD->uspace) {
|
|---|
| 54 | uint64_t sp;
|
|---|
| 55 |
|
|---|
| 56 | /*
|
|---|
| 57 | * Write kernel stack address to %g6 of the alternate and
|
|---|
| 58 | * interrupt global sets.
|
|---|
| 59 | *
|
|---|
| 60 | * Write pointer to the last item in the userspace window buffer
|
|---|
| 61 | * to %g7 in the alternate set. Write to the interrupt %g7 is
|
|---|
| 62 | * not necessary because:
|
|---|
| 63 | * - spill traps operate only in the alternate global set,
|
|---|
| 64 | * - preemptible trap handler switches to alternate globals
|
|---|
| 65 | * before it explicitly uses %g7.
|
|---|
| 66 | */
|
|---|
| 67 | sp = (uintptr_t) THREAD->kstack + STACK_SIZE - STACK_BIAS;
|
|---|
| 68 | write_to_ig_g6(sp);
|
|---|
| 69 | write_to_ag_g6(sp);
|
|---|
| 70 | write_to_ag_g7((uintptr_t) THREAD->arch.uspace_window_buffer);
|
|---|
| 71 | }
|
|---|
| 72 | }
|
|---|
| 73 |
|
|---|
| 74 | /** Perform sparc64 specific steps before a thread stops running. */
|
|---|
| 75 | void after_thread_ran_arch(void)
|
|---|
| 76 | {
|
|---|
| 77 | if (THREAD->uspace) {
|
|---|
| 78 | asm volatile ("flushw");
|
|---|
| 79 |
|
|---|
| 80 | /* sample the state of the userspace window buffer */
|
|---|
| 81 | THREAD->arch.uspace_window_buffer =
|
|---|
| 82 | (uint8_t *) read_from_ag_g7();
|
|---|
| 83 | }
|
|---|
| 84 | }
|
|---|
| 85 |
|
|---|
| 86 | /** @}
|
|---|
| 87 | */
|
|---|
