source: mainline/kernel/arch/sparc64/src/proc/thread.c@ 91d6d28

/*
 * Copyright (C) 2006 Jakub Jermar
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 * - The name of the author may not be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

/** @addtogroup sparc64proc
 * @{
 */
/** @file
 */

#include <proc/thread.h>
#include <arch/proc/thread.h>
#include <mm/frame.h>
#include <mm/page.h>
#include <arch/mm/page.h>
#include <align.h>

void thr_constructor_arch(thread_t *t)
{
        /*
         * Allocate memory for uspace_window_buffer.
         */
        t->arch.uspace_window_buffer = NULL;
}

void thr_destructor_arch(thread_t *t)
{
        if (t->arch.uspace_window_buffer) {
                /*
                 * Mind the possible alignment of the userspace window buffer
                 * belonging to a killed thread.
                 */
                frame_free(KA2PA(ALIGN_DOWN((uintptr_t) t->arch.uspace_window_buffer, PAGE_SIZE)));
        }
}

void thread_create_arch(thread_t *t)
{
        if ((t->flags & THREAD_FLAG_USPACE) && (!t->arch.uspace_window_buffer)) {
                /*
                 * The thread needs userspace window buffer and the object
                 * returned from the slab allocator doesn't have any.
                 */
                t->arch.uspace_window_buffer = frame_alloc(ONE_FRAME, FRAME_KA);
        } else {
                uintptr_t uw_buf = (uintptr_t) t->arch.uspace_window_buffer;

                /*
                 * Mind the possible alignment of the userspace window buffer
                 * belonging to a killed thread.
                 */
                 t->arch.uspace_window_buffer = (uint8_t *) ALIGN_DOWN(uw_buf, PAGE_SIZE);
        }
}

/** @}
 */