Subversion Repositories HelenOS

Rev

Rev 2082 | Go to most recent revision | Details | Compare with Previous | Last modification | View Log | RSS feed

Rev Author Line No. Line
901 jermar 1 
/*
2071 jermar 2 
 * Copyright (c) 2006 Jakub Jermar
901 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 
 
1888 jermar 29 
/** @addtogroup ia64proc
1702 cejka 30 
 * @{
31 
 */
32 
/** @file
33 
 */
34 
 
901 jermar 35 
#include <proc/scheduler.h>
36 
#include <proc/thread.h>
37 
#include <arch.h>
911 jermar 38 
#include <arch/register.h>
912 jermar 39 
#include <arch/context.h>
916 jermar 40 
#include <arch/stack.h>
901 jermar 41 
#include <arch/mm/tlb.h>
42 
#include <config.h>
43 
#include <align.h>
44 
 
1187 jermar 45 
/** Perform ia64 specific tasks needed before the new task is run. */
46 
void before_task_runs_arch(void)
47 
{
48 
}
49 
 
3766 jermar 50 
/** Prepare kernel stack pointers in bank 0 r22 and r23 and make sure the stack
51 
 * is mapped in DTR.
52 
 */
901 jermar 53 
void before_thread_runs_arch(void)
54 
{
1780 jermar 55 
    uintptr_t base;
901 jermar 56 
 
3766 jermar 57 
    base = ALIGN_DOWN(config.base, 1 << KERNEL_PAGE_WIDTH);
901 jermar 58 
 
3766 jermar 59 
    if ((uintptr_t) THREAD->kstack < base ||
60 
        (uintptr_t) THREAD->kstack > base + (1 << (KERNEL_PAGE_WIDTH))) {
901 jermar 61 
        /*
903 jermar 62 
         * Kernel stack of this thread is not mapped by DTR[TR_KERNEL].
1138 jermar 63 
         * Use DTR[TR_KSTACK1] and DTR[TR_KSTACK2] to map it.
901 jermar 64 
         */
1675 jermar 65 
 
66 
        /* purge DTR[TR_STACK1] and DTR[TR_STACK2] */
1780 jermar 67 
        dtr_purge((uintptr_t) THREAD->kstack, PAGE_WIDTH+1);
1675 jermar 68 
 
69 
        /* insert DTR[TR_STACK1] and DTR[TR_STACK2] */
3766 jermar 70 
        dtlb_kernel_mapping_insert((uintptr_t) THREAD->kstack,
71 
            KA2PA(THREAD->kstack), true, DTR_KSTACK1);
72 
        dtlb_kernel_mapping_insert((uintptr_t) THREAD->kstack +
73 
            PAGE_SIZE, KA2PA(THREAD->kstack) + FRAME_SIZE, true,
74 
            DTR_KSTACK2);
901 jermar 75 
    }
903 jermar 76 
 
77 
    /*
916 jermar 78 
     * Record address of kernel backing store to bank 0 r22.
79 
     * Record address of kernel stack to bank 0 r23.
80 
     * These values will be found there after switch from userspace.
903 jermar 81 
     */
2082 decky 82 
    asm volatile (
911 jermar 83 
        "bsw.0\n"
916 jermar 84 
        "mov r22 = %0\n"
85 
        "mov r23 = %1\n"
911 jermar 86 
        "bsw.1\n"
916 jermar 87 
        :
993 jermar 88 
        : "r" (&THREAD->kstack[THREAD_STACK_SIZE]),
935 vana 89 
          "r" (&THREAD->kstack[THREAD_STACK_SIZE - SP_DELTA])
90 
        );
901 jermar 91 
}
92 
 
93 
void after_thread_ran_arch(void)
94 
{
95 
}
1702 cejka 96 
 
1888 jermar 97 
/** @}
1702 cejka 98 
 */