Subversion Repositories HelenOS

Rev

Rev 2272 | Details | Compare with Previous | Last modification | View Log | RSS feed

Rev Author Line No. Line
897 jermar 1 
/*
2071 jermar 2 
 * Copyright (c) 2006 Jakub Jermar
897 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 
 
1784 jermar 29 
/** @addtogroup sparc64proc
1702 cejka 30 
 * @{
31 
 */
32 
/** @file
33 
 */
34 
 
897 jermar 35 
#include <proc/scheduler.h>
36 
#include <proc/thread.h>
37 
#include <arch.h>
1855 jermar 38 
#include <arch/asm.h>
1856 jermar 39 
#include <arch/stack.h>
897 jermar 40 
 
1187 jermar 41 
/** Perform sparc64 specific tasks needed before the new task is run. */
42 
void before_task_runs_arch(void)
43 
{
44 
}
45 
 
1855 jermar 46 
/** Perform sparc64 specific steps before scheduling a thread.
47 
 *
2055 jermar 48 
 * For userspace threads, initialize reserved global registers in the alternate
49 
 * and interrupt sets.
1855 jermar 50 
 */
897 jermar 51 
void before_thread_runs_arch(void)
52 
{
1855 jermar 53 
    if ((THREAD->flags & THREAD_FLAG_USPACE)) {
54 
        /*
2054 jermar 55 
         * Write kernel stack address to %g6 of the alternate and
56 
         * interrupt global sets.
57 
         *
58 
         * Write pointer to the last item in the userspace window buffer
59 
         * to %g7 in the alternate set. Write to the interrupt %g7 is
60 
         * not necessary because:
61 
         * - spill traps operate only in the alternate global set,
62 
         * - preemptible trap handler switches to alternate globals
63 
         *   before it explicitly uses %g7.
1856 jermar 64 
         */
2272 jermar 65 
        uint64_t sp = (uintptr_t) THREAD->kstack + STACK_SIZE -
66 
            (STACK_BIAS + ALIGN_UP(STACK_ITEM_SIZE, STACK_ALIGNMENT));
1860 jermar 67 
        write_to_ig_g6(sp);
68 
        write_to_ag_g6(sp);
1856 jermar 69 
        write_to_ag_g7((uintptr_t) THREAD->arch.uspace_window_buffer);
1855 jermar 70 
    }
897 jermar 71 
}
72 
 
2055 jermar 73 
/** Perform sparc64 specific steps before a thread stops running. */
897 jermar 74 
void after_thread_ran_arch(void)
75 
{
1855 jermar 76 
    if ((THREAD->flags & THREAD_FLAG_USPACE)) {
1856 jermar 77 
        /* sample the state of the userspace window buffer */  
78 
        THREAD->arch.uspace_window_buffer = (uint8_t *) read_from_ag_g7();
1855 jermar 79 
    }
897 jermar 80 
}
1702 cejka 81 
 
1784 jermar 82 
/** @}
1702 cejka 83 
 */