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897 jermar 1 
/*
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 * Copyright (c) 2006 Jakub Jermar
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 * All rights reserved.
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions
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 * are met:
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 *
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 * - Redistributions of source code must retain the above copyright
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 *   notice, this list of conditions and the following disclaimer.
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 * - Redistributions in binary form must reproduce the above copyright
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 *   notice, this list of conditions and the following disclaimer in the
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 *   documentation and/or other materials provided with the distribution.
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 * - The name of the author may not be used to endorse or promote products
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 *   derived from this software without specific prior written permission.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 */
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/** @addtogroup sparc64proc
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 * @{
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 */
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/** @file
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 */
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#include <proc/scheduler.h>
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#include <proc/thread.h>
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#include <arch.h>
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#include <arch/asm.h>
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#include <arch/stack.h>
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/** Perform sparc64 specific tasks needed before the new task is run. */
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void before_task_runs_arch(void)
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{
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}
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/** Perform sparc64 specific steps before scheduling a thread.
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 *
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 * For userspace threads, initialize reserved global registers in the alternate
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 * and interrupt sets.
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 */
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void before_thread_runs_arch(void)
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{
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    if ((THREAD->flags & THREAD_FLAG_USPACE)) {
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        /*
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         * Write kernel stack address to %g6 of the alternate and
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         * interrupt global sets.
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         *
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         * Write pointer to the last item in the userspace window buffer
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         * to %g7 in the alternate set. Write to the interrupt %g7 is
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         * not necessary because:
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         * - spill traps operate only in the alternate global set,
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         * - preemptible trap handler switches to alternate globals
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         *   before it explicitly uses %g7.
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         */
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        uint64_t sp = (uintptr_t) THREAD->kstack + STACK_SIZE -
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            (STACK_BIAS + ALIGN_UP(STACK_ITEM_SIZE, STACK_ALIGNMENT));
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        write_to_ig_g6(sp);
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        write_to_ag_g6(sp);
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        write_to_ag_g7((uintptr_t) THREAD->arch.uspace_window_buffer);
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    }
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}
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/** Perform sparc64 specific steps before a thread stops running. */
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void after_thread_ran_arch(void)
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{
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    if ((THREAD->flags & THREAD_FLAG_USPACE)) {
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        /* sample the state of the userspace window buffer */  
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        THREAD->arch.uspace_window_buffer = (uint8_t *) read_from_ag_g7();
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    }
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}
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/** @}
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 */