Subversion Repositories HelenOS

Rev

Rev 630 | Rev 634 | Go to most recent revision | Details | Compare with Previous | Last modification | View Log | RSS feed

Rev Author Line No. Line
619 jermar 1
/*
2
 * Copyright (C) 2005 Jakub 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
 
630 jermar 29
#include <arch/trap/trap.h>
30
#include <arch/trap/trap_table.h>
632 jermar 31
#include <arch/trap/regwin.h>
619 jermar 32
#include <arch/asm.h>
33
#include <memstr.h>
632 jermar 34
#include <debug.h>
35
#include <arch/types.h>
36
#include <typedefs.h>
619 jermar 37
 
627 jermar 38
/** Initialize trap table. */
619 jermar 39
void trap_init(void)
40
{
41
    /*
42
     * Copy OFW's trap table into kernel.
43
     */
44
    memcpy((void *) trap_table, (void *) tba_read(), TRAP_TABLE_SIZE);
632 jermar 45
 
46
    /*
47
     * Install kernel-provided handlers.
48
     */
49
    trap_install_handler(TT_CLEAN_WINDOW, CLEAN_WINDOW_HANDLER_SIZE, false);
50
    trap_install_handler(TT_SPILL_0_NORMAL, SPILL_HANDLER_SIZE, false);
51
    trap_install_handler(TT_FILL_0_NORMAL, FILL_HANDLER_SIZE, false);
619 jermar 52
}
632 jermar 53
 
54
/** Copy trap handler to active trap table.
55
 *
56
 * The handler is copied from trap_table_kernel to trap_handler.
57
 *
58
 * @param tt Trap type. An index that uniquelly identifies handler code.
59
 * @param len Length of the handler in bytes. Must be multiple of TRAP_TABLE_ENTRY_SIZE (i.e. 32).
60
 * @param tlnonz If false, tt is considered from the lower half of trap table. If true, the upper half is chosen.
61
 */
62
void trap_install_handler(index_t tt, size_t len, bool tlnonz)
63
{
64
    count_t cnt;
65
    int i;
66
 
67
    ASSERT(tt < TRAP_TABLE_ENTRY_COUNT/2);
68
    ASSERT(len % TRAP_TABLE_ENTRY_SIZE == 0);
69
 
70
    if (tlnonz)
71
        tt += TRAP_TABLE_ENTRY_COUNT/2;
72
 
73
    cnt = len/TRAP_TABLE_ENTRY_SIZE;
74
 
75
    for (i = tt; i < tt + cnt; i++) {
76
        trap_table[i] = trap_table_kernel[i];
77
    }  
78
}