Subversion Repositories HelenOS

Rev

Rev 2116 | Rev 3940 | Go to most recent revision | Details | Compare with Previous | Last modification | View Log | RSS feed

Rev Author Line No. Line
1178 jermar 1
/*
2071 jermar 2
 * Copyright (c) 2006 Jakub Jermar
1178 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
 */
1702 cejka 28
 
1888 jermar 29
/** @addtogroup genericddi
1702 cejka 30
 * @{
31
 */
1248 jermar 32
 
33
/**
1702 cejka 34
 * @file
1248 jermar 35
 * @brief   Device Driver Interface functions.
36
 *
37
 * This file contains functions that comprise the Device Driver Interface.
38
 * These are the functions for mapping physical memory and enabling I/O
39
 * space to tasks.
40
 */
1178 jermar 41
 
42
#include <ddi/ddi.h>
43
#include <ddi/ddi_arg.h>
44
#include <proc/task.h>
45
#include <security/cap.h>
46
#include <mm/frame.h>
47
#include <mm/as.h>
48
#include <synch/spinlock.h>
1288 jermar 49
#include <syscall/copy.h>
2015 jermar 50
#include <adt/btree.h>
1178 jermar 51
#include <arch.h>
52
#include <align.h>
53
#include <errno.h>
54
 
2015 jermar 55
/** This lock protects the parea_btree. */
56
SPINLOCK_INITIALIZE(parea_lock);
57
 
58
/** B+tree with enabled physical memory areas. */
59
static btree_t parea_btree;
60
 
61
/** Initialize DDI. */
62
void ddi_init(void)
63
{
64
    btree_create(&parea_btree);
65
}
66
 
67
/** Enable piece of physical memory for mapping by physmem_map().
68
 *
69
 * @param parea Pointer to physical area structure.
70
 *
71
 * @todo This function doesn't check for overlaps. It depends on the kernel to
72
 * create disjunct physical memory areas.
73
 */
74
void ddi_parea_register(parea_t *parea)
75
{
76
    ipl_t ipl;
77
 
78
    ipl = interrupts_disable();
79
    spinlock_lock(&parea_lock);
80
 
81
    /*
82
     * TODO: we should really check for overlaps here.
83
     * However, we should be safe because the kernel is pretty sane and
84
     * memory of different devices doesn't overlap.
85
     */
86
    btree_insert(&parea_btree, (btree_key_t) parea->pbase, parea, NULL);
87
 
88
    spinlock_unlock(&parea_lock);
89
    interrupts_restore(ipl);   
90
}
91
 
1494 palkovsky 92
/** Map piece of physical memory into virtual address space of current task.
1178 jermar 93
 *
2015 jermar 94
 * @param pf Physical address of the starting frame.
95
 * @param vp Virtual address of the starting page.
1178 jermar 96
 * @param pages Number of pages to map.
1429 jermar 97
 * @param flags Address space area flags for the mapping.
1178 jermar 98
 *
2015 jermar 99
 * @return 0 on success, EPERM if the caller lacks capabilities to use this
100
 *  syscall, ENOENT if there is no task matching the specified ID or the
101
 *  physical address space is not enabled for mapping and ENOMEM if there
2141 jermar 102
 *  was a problem in creating address space area.
1178 jermar 103
 */
1780 jermar 104
static int ddi_physmem_map(uintptr_t pf, uintptr_t vp, count_t pages, int flags)
1178 jermar 105
{
106
    ipl_t ipl;
107
    cap_t caps;
1425 jermar 108
    mem_backend_data_t backend_data;
109
 
110
    backend_data.base = pf;
111
    backend_data.frames = pages;
1178 jermar 112
 
113
    /*
114
     * Make sure the caller is authorised to make this syscall.
115
     */
116
    caps = cap_get(TASK);
117
    if (!(caps & CAP_MEM_MANAGER))
118
        return EPERM;
1494 palkovsky 119
 
1178 jermar 120
    ipl = interrupts_disable();
2015 jermar 121
 
122
    /*
123
     * Check if the physical memory area is enabled for mapping.
124
     * If the architecture supports virtually indexed caches, intercept
125
     * attempts to create an illegal address alias.
126
     */
127
    spinlock_lock(&parea_lock);
128
    parea_t *parea;
129
    btree_node_t *nodep;
2116 decky 130
    parea = (parea_t *) btree_search(&parea_btree, (btree_key_t) pf, &nodep);
2015 jermar 131
    if (!parea || parea->frames < pages || ((flags & AS_AREA_CACHEABLE) &&
2107 jermar 132
        !parea->cacheable) || (!(flags & AS_AREA_CACHEABLE) &&
133
        parea->cacheable)) {
2015 jermar 134
        /*
135
         * This physical memory area cannot be mapped.
136
         */
137
        spinlock_unlock(&parea_lock);
138
        interrupts_restore(ipl);
139
        return ENOENT;
140
    }
141
    spinlock_unlock(&parea_lock);
142
 
1494 palkovsky 143
    spinlock_lock(&TASK->lock);
1178 jermar 144
 
1494 palkovsky 145
    if (!as_area_create(TASK->as, flags, pages * PAGE_SIZE, vp, AS_AREA_ATTR_NONE,
1424 jermar 146
        &phys_backend, &backend_data)) {
1178 jermar 147
        /*
148
         * The address space area could not have been created.
149
         * We report it using ENOMEM.
150
         */
1494 palkovsky 151
        spinlock_unlock(&TASK->lock);
1178 jermar 152
        interrupts_restore(ipl);
153
        return ENOMEM;
154
    }
155
 
1424 jermar 156
    /*
157
     * Mapping is created on-demand during page fault.
158
     */
159
 
1494 palkovsky 160
    spinlock_unlock(&TASK->lock);
1178 jermar 161
    interrupts_restore(ipl);
162
    return 0;
163
}
164
 
1191 jermar 165
/** Enable range of I/O space for task.
166
 *
167
 * @param id Task ID of the destination task.
168
 * @param ioaddr Starting I/O address.
169
 * @param size Size of the enabled I/O space..
170
 *
2015 jermar 171
 * @return 0 on success, EPERM if the caller lacks capabilities to use this
172
 *  syscall, ENOENT if there is no task matching the specified ID.
1191 jermar 173
 */
1780 jermar 174
static int ddi_iospace_enable(task_id_t id, uintptr_t ioaddr, size_t size)
1191 jermar 175
{
176
    ipl_t ipl;
177
    cap_t caps;
178
    task_t *t;
179
    int rc;
180
 
181
    /*
182
     * Make sure the caller is authorised to make this syscall.
183
     */
184
    caps = cap_get(TASK);
185
    if (!(caps & CAP_IO_MANAGER))
186
        return EPERM;
187
 
188
    ipl = interrupts_disable();
189
    spinlock_lock(&tasks_lock);
190
 
191
    t = task_find_by_id(id);
192
 
1839 decky 193
    if ((!t) || (!context_check(CONTEXT, t->context))) {
1191 jermar 194
        /*
1839 decky 195
         * There is no task with the specified ID
196
         * or the task belongs to a different security
197
         * context.
1191 jermar 198
         */
199
        spinlock_unlock(&tasks_lock);
200
        interrupts_restore(ipl);
201
        return ENOENT;
202
    }
203
 
204
    /* Lock the task and release the lock protecting tasks_btree. */
205
    spinlock_lock(&t->lock);
206
    spinlock_unlock(&tasks_lock);
207
 
1227 jermar 208
    rc = ddi_iospace_enable_arch(t, ioaddr, size);
1191 jermar 209
 
210
    spinlock_unlock(&t->lock);
211
    interrupts_restore(ipl);
212
    return rc;
213
}
214
 
2012 jermar 215
/** Wrapper for SYS_PHYSMEM_MAP syscall.
1178 jermar 216
 *
1494 palkovsky 217
 * @param phys_base Physical base address to map
218
 * @param virt_base Destination virtual address
219
 * @param pages Number of pages
220
 * @param flags Flags of newly mapped pages
1178 jermar 221
 *
222
 * @return 0 on success, otherwise it returns error code found in errno.h
223
 */
2107 jermar 224
unative_t sys_physmem_map(unative_t phys_base, unative_t virt_base,
225
    unative_t pages, unative_t flags)
1178 jermar 226
{
2015 jermar 227
    return (unative_t) ddi_physmem_map(ALIGN_DOWN((uintptr_t) phys_base,
2107 jermar 228
        FRAME_SIZE), ALIGN_DOWN((uintptr_t) virt_base, PAGE_SIZE),
229
        (count_t) pages, (int) flags);
1178 jermar 230
}
1191 jermar 231
 
232
/** Wrapper for SYS_ENABLE_IOSPACE syscall.
233
 *
1708 jermar 234
 * @param uspace_io_arg User space address of DDI argument structure.
1191 jermar 235
 *
236
 * @return 0 on success, otherwise it returns error code found in errno.h
237
 */
1780 jermar 238
unative_t sys_iospace_enable(ddi_ioarg_t *uspace_io_arg)
1191 jermar 239
{
240
    ddi_ioarg_t arg;
1288 jermar 241
    int rc;
1191 jermar 242
 
1288 jermar 243
    rc = copy_from_uspace(&arg, uspace_io_arg, sizeof(ddi_ioarg_t));
244
    if (rc != 0)
1780 jermar 245
        return (unative_t) rc;
1288 jermar 246
 
2015 jermar 247
    return (unative_t) ddi_iospace_enable((task_id_t) arg.task_id,
2107 jermar 248
        (uintptr_t) arg.ioaddr, (size_t) arg.size);
1191 jermar 249
}
1297 jermar 250
 
251
/** Disable or enable preemption.
252
 *
2015 jermar 253
 * @param enable If non-zero, the preemption counter will be decremented,
254
 *  leading to potential enabling of preemption. Otherwise the preemption
255
 *  counter will be incremented, preventing preemption from occurring.
1297 jermar 256
 *
257
 * @return Zero on success or EPERM if callers capabilities are not sufficient.
258
 */
1780 jermar 259
unative_t sys_preempt_control(int enable)
1297 jermar 260
{
2107 jermar 261
        if (!cap_get(TASK) & CAP_PREEMPT_CONTROL)
1297 jermar 262
                return EPERM;
263
        if (enable)
264
                preemption_enable();
265
        else
266
                preemption_disable();
267
        return 0;
268
}
1702 cejka 269
 
1888 jermar 270
/** @}
1702 cejka 271
 */