Subversion Repositories HelenOS

Rev

Rev 2089 | Details | Compare with Previous | Last modification | View Log | RSS feed

Rev Author Line No. Line
1191 jermar 1
/*
2071 jermar 2
 * Copyright (c) 2006 Jakub Jermar
1191 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 amd64ddi
1702 cejka 30
 * @{
31
 */
32
/** @file
33
 */
34
 
1191 jermar 35
#include <ddi/ddi.h>
1256 jermar 36
#include <arch/ddi/ddi.h>
1191 jermar 37
#include <proc/task.h>
38
#include <arch/types.h>
1203 jermar 39
#include <adt/bitmap.h>
40
#include <mm/slab.h>
41
#include <arch/pm.h>
42
#include <errno.h>
1212 palkovsky 43
#include <arch/cpu.h>
1256 jermar 44
#include <arch.h>
1263 jermar 45
#include <align.h>
1191 jermar 46
 
47
/** Enable I/O space range for task.
48
 *
49
 * Interrupts are disabled and task is locked.
50
 *
51
 * @param task Task.
52
 * @param ioaddr Startign I/O space address.
53
 * @param size Size of the enabled I/O range.
54
 *
55
 * @return 0 on success or an error code from errno.h.
56
 */
1780 jermar 57
int ddi_iospace_enable_arch(task_t *task, uintptr_t ioaddr, size_t size)
1191 jermar 58
{
1203 jermar 59
    count_t bits;
60
 
61
    bits = ioaddr + size;
62
    if (bits > IO_PORTS)
63
        return ENOENT;
64
 
65
    if (task->arch.iomap.bits < bits) {
66
        bitmap_t oldiomap;
1780 jermar 67
        uint8_t *newmap;
1203 jermar 68
 
69
        /*
70
         * The I/O permission bitmap is too small and needs to be grown.
71
         */
72
 
1780 jermar 73
        newmap = (uint8_t *) malloc(BITS2BYTES(bits), FRAME_ATOMIC);
1203 jermar 74
        if (!newmap)
75
            return ENOMEM;
76
 
77
        bitmap_initialize(&oldiomap, task->arch.iomap.map, task->arch.iomap.bits);
78
        bitmap_initialize(&task->arch.iomap, newmap, bits);
79
 
80
        /*
81
         * Mark the new range inaccessible.
82
         */
83
        bitmap_set_range(&task->arch.iomap, oldiomap.bits, bits - oldiomap.bits);
84
 
85
        /*
86
         * In case there really existed smaller iomap,
87
         * copy its contents and deallocate it.
88
         */    
89
        if (oldiomap.bits) {
1261 jermar 90
            bitmap_copy(&task->arch.iomap, &oldiomap, oldiomap.bits);
1203 jermar 91
            free(oldiomap.map);
92
        }
93
    }
94
 
95
    /*
96
     * Enable the range and we are done.
97
     */
98
    bitmap_clear_range(&task->arch.iomap, (index_t) ioaddr, (count_t) size);
99
 
1256 jermar 100
    /*
101
     * Increment I/O Permission bitmap generation counter.
102
     */
103
    task->arch.iomapver++;
104
 
1191 jermar 105
    return 0;
106
}
1212 palkovsky 107
 
1256 jermar 108
/** Install I/O Permission bitmap.
109
 *
110
 * Current task's I/O permission bitmap, if any, is installed
111
 * in the current CPU's TSS.
112
 *
113
 * Interrupts must be disabled prior this call.
114
 */
115
void io_perm_bitmap_install(void)
116
{
117
    count_t bits;
118
    ptr_16_64_t cpugdtr;
119
    descriptor_t *gdt_p;
120
    tss_descriptor_t *tss_desc;
121
    count_t ver;
122
 
123
    /* First, copy the I/O Permission Bitmap. */
124
    spinlock_lock(&TASK->lock);
125
    ver = TASK->arch.iomapver;
126
    if ((bits = TASK->arch.iomap.bits)) {
127
        bitmap_t iomap;
128
 
129
        ASSERT(TASK->arch.iomap.map);
130
        bitmap_initialize(&iomap, CPU->arch.tss->iomap, TSS_IOMAP_SIZE * 8);
131
        bitmap_copy(&iomap, &TASK->arch.iomap, TASK->arch.iomap.bits);
132
        /*
133
         * It is safe to set the trailing eight bits because of the extra
134
         * convenience byte in TSS_IOMAP_SIZE.
135
         */
1263 jermar 136
        bitmap_set_range(&iomap, ALIGN_UP(TASK->arch.iomap.bits, 8), 8);
1256 jermar 137
    }
138
    spinlock_unlock(&TASK->lock);
139
 
1263 jermar 140
    /*
141
     * Second, adjust TSS segment limit.
142
     * Take the extra ending byte will all bits set into account.
143
     */
1256 jermar 144
    gdtr_store(&cpugdtr);
145
    gdt_p = (descriptor_t *) cpugdtr.base;
1263 jermar 146
    gdt_tss_setlimit(&gdt_p[TSS_DES], TSS_BASIC_SIZE + BITS2BYTES(bits));
1256 jermar 147
    gdtr_load(&cpugdtr);
148
 
149
    /*
150
         * Before we load new TSS limit, the current TSS descriptor
151
         * type must be changed to describe inactive TSS.
152
         */
153
    tss_desc = (tss_descriptor_t *) &gdt_p[TSS_DES];
154
    tss_desc->type = AR_TSS;
155
    tr_load(gdtselector(TSS_DES));
156
 
157
    /*
158
     * Update the generation count so that faults caused by
159
     * early accesses can be serviced.
160
     */
161
    CPU->arch.iomapver_copy = ver;
162
}
1702 cejka 163
 
1888 jermar 164
/** @}
1702 cejka 165
 */