Subversion Repositories HelenOS-historic

Rev

Rev 1255 | Rev 1702 | Go to most recent revision | Only display areas with differences | Ignore whitespace | Details | Blame | Last modification | View Log | RSS feed

Rev 1255 Rev 1256
1 
/*
 1 
/*
2 
 * Copyright (C) 2005 Jakub Jermar
 2 
 * Copyright (C) 2005 Jakub Jermar
3 
 * All rights reserved.
 3 
 * All rights reserved.
4 
 *
 4 
 *
5 
 * Redistribution and use in source and binary forms, with or without
 5 
 * Redistribution and use in source and binary forms, with or without
6 
 * modification, are permitted provided that the following conditions
 6 
 * modification, are permitted provided that the following conditions
7 
 * are met:
 7 
 * are met:
8 
 *
 8 
 *
9 
 * - Redistributions of source code must retain the above copyright
 9 
 * - Redistributions of source code must retain the above copyright
10 
 *   notice, this list of conditions and the following disclaimer.
 10 
 *   notice, this list of conditions and the following disclaimer.
11 
 * - Redistributions in binary form must reproduce the above copyright
 11 
 * - Redistributions in binary form must reproduce the above copyright
12 
 *   notice, this list of conditions and the following disclaimer in the
 12 
 *   notice, this list of conditions and the following disclaimer in the
13 
 *   documentation and/or other materials provided with the distribution.
 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
 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.
 15 
 *   derived from this software without specific prior written permission.
16 
 *
 16 
 *
17 
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 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
 18 
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19 
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 19 
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 20 
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21 
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 21 
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22 
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 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
 23 
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 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
 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.
 26 
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 
 */
 27 
 */
28 
 
 28 
 
29 
#include <proc/scheduler.h>
 29 
#include <proc/scheduler.h>
30 
#include <cpu.h>
 30 
#include <cpu.h>
31 
#include <proc/task.h>
 31 
#include <proc/task.h>
32 
#include <proc/thread.h>
 32 
#include <proc/thread.h>
33 
#include <arch.h>
 33 
#include <arch.h>
34 
#include <arch/context.h>   /* SP_DELTA */
 34 
#include <arch/context.h>   /* SP_DELTA */
35 
#include <arch/debugger.h>
 35 
#include <arch/debugger.h>
36 
#include <arch/pm.h>
 36 
#include <arch/pm.h>
37 
#include <arch/asm.h>
 37 
#include <arch/asm.h>
38 
#include <adt/bitmap.h>
 38 
#include <arch/ddi/ddi.h>
39 
#include <print.h>
 - 
 
40 
 
 39 
 
41 
/** Perform ia32 specific tasks needed before the new task is run.
 40 
/** Perform ia32 specific tasks needed before the new task is run.
42 
 *
 41 
 *
43 
 * Interrupts are disabled.
 42 
 * Interrupts are disabled.
44 
 */
 43 
 */
45 
void before_task_runs_arch(void)
 44 
void before_task_runs_arch(void)
46 
{
 45 
{
47 
    count_t bits;
 - 
 
48 
    ptr_16_32_t cpugdtr;
 - 
 
49 
    descriptor_t *gdt_p;
 - 
 
50 
 
 - 
 
51 
    /*
 - 
 
52 
     * Switch the I/O Permission Bitmap, if necessary.
 - 
 
53 
     */
 - 
 
54 
 
 - 
 
55 
    /* First, copy the I/O Permission Bitmap. */
 - 
 
56 
    spinlock_lock(&TASK->lock);
 - 
 
57 
    if ((bits = TASK->arch.iomap.bits)) {
 - 
 
58 
        bitmap_t iomap;
 46 
    io_perm_bitmap_install();
59 
   
 - 
 
60 
        ASSERT(TASK->arch.iomap.map);
 - 
 
61 
        bitmap_initialize(&iomap, CPU->arch.tss->iomap, TSS_IOMAP_SIZE * 8);
 - 
 
62 
        bitmap_copy(&iomap, &TASK->arch.iomap, TASK->arch.iomap.bits);
 - 
 
63 
        /*
 - 
 
64 
         * It is safe to set the trailing eight bits because of the extra
 - 
 
65 
         * convenience byte in TSS_IOMAP_SIZE.
 - 
 
66 
         */
 - 
 
67 
        bitmap_set_range(&iomap, TASK->arch.iomap.bits, 8);
 - 
 
68 
    }
 - 
 
69 
    spinlock_unlock(&TASK->lock);
 - 
 
70 
 
 - 
 
71 
    /* Second, adjust TSS segment limit. */
 - 
 
72 
    gdtr_store(&cpugdtr);
 - 
 
73 
    gdt_p = (descriptor_t *) cpugdtr.base;
 - 
 
74 
    gdt_setlimit(&gdt_p[TSS_DES], TSS_BASIC_SIZE + BITS2BYTES(bits) - 1);
 - 
 
75 
    gdtr_load(&cpugdtr);
 - 
 
76 
 
 - 
 
77 
    /*
 - 
 
78 
     * Before we load new TSS limit, the current TSS descriptor
 - 
 
79 
     * type must be changed to describe inactive TSS.
 - 
 
80 
     */
 - 
 
81 
    gdt_p[TSS_DES].access = AR_PRESENT | AR_TSS | DPL_KERNEL;
 - 
 
82 
    tr_load(selector(TSS_DES));
 - 
 
83 
}
 47 
}
84 
 
 48 
 
85 
/** Perform ia32 specific tasks needed before the new thread is scheduled.
 49 
/** Perform ia32 specific tasks needed before the new thread is scheduled.
86 
 *
 50 
 *
87 
 * THREAD is locked and interrupts are disabled.
 51 
 * THREAD is locked and interrupts are disabled.
88 
 */
 52 
 */
89 
void before_thread_runs_arch(void)
 53 
void before_thread_runs_arch(void)
90 
{
 54 
{
91 
    CPU->arch.tss->esp0 = (__address) &THREAD->kstack[THREAD_STACK_SIZE-SP_DELTA];
 55 
    CPU->arch.tss->esp0 = (__address) &THREAD->kstack[THREAD_STACK_SIZE-SP_DELTA];
92 
    CPU->arch.tss->ss0 = selector(KDATA_DES);
 56 
    CPU->arch.tss->ss0 = selector(KDATA_DES);
93 
 
 57 
 
94 
    /* Set up TLS in GS register */
 58 
    /* Set up TLS in GS register */
95 
    set_tls_desc(THREAD->arch.tls);
 59 
    set_tls_desc(THREAD->arch.tls);
96 
 
 60 
 
97 
#ifdef CONFIG_DEBUG_AS_WATCHPOINT
 61 
#ifdef CONFIG_DEBUG_AS_WATCHPOINT
98 
    /* Set watchpoint on AS to ensure that nobody sets it to zero */
 62 
    /* Set watchpoint on AS to ensure that nobody sets it to zero */
99 
    if (CPU->id < BKPOINTS_MAX)
 63 
    if (CPU->id < BKPOINTS_MAX)
100 
        breakpoint_add(&((the_t *) THREAD->kstack)->as,
 64 
        breakpoint_add(&((the_t *) THREAD->kstack)->as,
101 
                   BKPOINT_WRITE | BKPOINT_CHECK_ZERO,
 65 
                   BKPOINT_WRITE | BKPOINT_CHECK_ZERO,
102 
                   CPU->id);
 66 
                   CPU->id);
103 
#endif
 67 
#endif
104 
}
 68 
}
105 
 
 69 
 
106 
void after_thread_ran_arch(void)
 70 
void after_thread_ran_arch(void)
107 
{
 71 
{
108 
}
 72 
}
109 
 
 73