Subversion Repositories HelenOS

Rev

Rev 2441 | Go to most recent revision | 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
 
1731 jermar 29
/** @addtogroup ia32ddi
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 <cpu.h>
45
#include <arch.h>
1263 jermar 46
#include <align.h>
1191 jermar 47
 
48
/** Enable I/O space range for task.
49
 *
50
 * Interrupts are disabled and task is locked.
51
 *
52
 * @param task Task.
53
 * @param ioaddr Startign I/O space address.
54
 * @param size Size of the enabled I/O range.
55
 *
56
 * @return 0 on success or an error code from errno.h.
57
 */
1780 jermar 58
int ddi_iospace_enable_arch(task_t *task, uintptr_t ioaddr, size_t size)
1191 jermar 59
{
1203 jermar 60
    count_t bits;
61
 
62
    bits = ioaddr + size;
63
    if (bits > IO_PORTS)
64
        return ENOENT;
65
 
66
    if (task->arch.iomap.bits < bits) {
67
        bitmap_t oldiomap;
1780 jermar 68
        uint8_t *newmap;
1203 jermar 69
 
70
        /*
71
         * The I/O permission bitmap is too small and needs to be grown.
72
         */
73
 
1780 jermar 74
        newmap = (uint8_t *) malloc(BITS2BYTES(bits), FRAME_ATOMIC);
1203 jermar 75
        if (!newmap)
76
            return ENOMEM;
77
 
2630 jermar 78
        bitmap_initialize(&oldiomap, task->arch.iomap.map,
79
            task->arch.iomap.bits);
1203 jermar 80
        bitmap_initialize(&task->arch.iomap, newmap, bits);
81
 
82
        /*
83
         * Mark the new range inaccessible.
84
         */
2630 jermar 85
        bitmap_set_range(&task->arch.iomap, oldiomap.bits,
86
            bits - oldiomap.bits);
1203 jermar 87
 
88
        /*
89
         * In case there really existed smaller iomap,
90
         * copy its contents and deallocate it.
91
         */    
92
        if (oldiomap.bits) {
2630 jermar 93
            bitmap_copy(&task->arch.iomap, &oldiomap,
94
                oldiomap.bits);
1203 jermar 95
            free(oldiomap.map);
96
        }
97
    }
98
 
99
    /*
100
     * Enable the range and we are done.
101
     */
102
    bitmap_clear_range(&task->arch.iomap, (index_t) ioaddr, (count_t) size);
103
 
1256 jermar 104
    /*
105
     * Increment I/O Permission bitmap generation counter.
106
     */
107
    task->arch.iomapver++;
108
 
1191 jermar 109
    return 0;
110
}
1212 palkovsky 111
 
1256 jermar 112
/** Install I/O Permission bitmap.
113
 *
114
 * Current task's I/O permission bitmap, if any, is installed
115
 * in the current CPU's TSS.
116
 *
117
 * Interrupts must be disabled prior this call.
118
 */
119
void io_perm_bitmap_install(void)
120
{
121
    count_t bits;
122
    ptr_16_32_t cpugdtr;
123
    descriptor_t *gdt_p;
124
    count_t ver;
125
 
126
    /* First, copy the I/O Permission Bitmap. */
127
    spinlock_lock(&TASK->lock);
128
    ver = TASK->arch.iomapver;
129
    if ((bits = TASK->arch.iomap.bits)) {
130
        bitmap_t iomap;
2441 decky 131
        task_t *task = TASK;
1256 jermar 132
 
133
        ASSERT(TASK->arch.iomap.map);
2630 jermar 134
        bitmap_initialize(&iomap, CPU->arch.tss->iomap,
135
            TSS_IOMAP_SIZE * 8);
2441 decky 136
        bitmap_copy(&iomap, &task->arch.iomap, task->arch.iomap.bits);
1256 jermar 137
        /*
2630 jermar 138
         * It is safe to set the trailing eight bits because of the
139
         * extra convenience byte in TSS_IOMAP_SIZE.
1256 jermar 140
         */
1263 jermar 141
        bitmap_set_range(&iomap, ALIGN_UP(TASK->arch.iomap.bits, 8), 8);
1256 jermar 142
    }
143
    spinlock_unlock(&TASK->lock);
144
 
1263 jermar 145
    /*
146
     * Second, adjust TSS segment limit.
147
     * Take the extra ending byte with all bits set into account.
148
     */
1256 jermar 149
    gdtr_store(&cpugdtr);
150
    gdt_p = (descriptor_t *) cpugdtr.base;
1263 jermar 151
    gdt_setlimit(&gdt_p[TSS_DES], TSS_BASIC_SIZE + BITS2BYTES(bits));
1256 jermar 152
    gdtr_load(&cpugdtr);
153
 
154
    /*
155
     * Before we load new TSS limit, the current TSS descriptor
156
     * type must be changed to describe inactive TSS.
157
     */
158
    gdt_p[TSS_DES].access = AR_PRESENT | AR_TSS | DPL_KERNEL;
159
    tr_load(selector(TSS_DES));
160
 
161
    /*
162
     * Update the generation count so that faults caused by
163
     * early accesses can be serviced.
164
     */
165
    CPU->arch.iomapver_copy = ver;
166
}
1702 cejka 167
 
1731 jermar 168
/** @}
1702 cejka 169
 */