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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
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 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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 * 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
 */
4055 trochtova 32
 
1248 jermar 33
/**
1702 cejka 34
 * @file
4055 trochtova 35
 * @brief Device Driver Interface functions.
1248 jermar 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
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 * 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>
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#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
 */
72
void ddi_parea_register(parea_t *parea)
73
{
4055 trochtova 74
    ipl_t ipl = interrupts_disable();
2015 jermar 75
    spinlock_lock(&parea_lock);
76
 
77
    /*
4055 trochtova 78
     * We don't check for overlaps here as the kernel is pretty sane.
2015 jermar 79
     */
80
    btree_insert(&parea_btree, (btree_key_t) parea->pbase, parea, NULL);
4055 trochtova 81
 
2015 jermar 82
    spinlock_unlock(&parea_lock);
4055 trochtova 83
    interrupts_restore(ipl);
2015 jermar 84
}
85
 
1494 palkovsky 86
/** Map piece of physical memory into virtual address space of current task.
1178 jermar 87
 *
4055 trochtova 88
 * @param pf    Physical address of the starting frame.
89
 * @param vp    Virtual address of the starting page.
1178 jermar 90
 * @param pages Number of pages to map.
1429 jermar 91
 * @param flags Address space area flags for the mapping.
1178 jermar 92
 *
2015 jermar 93
 * @return 0 on success, EPERM if the caller lacks capabilities to use this
4055 trochtova 94
 *         syscall, EBADMEM if pf or vf is not page aligned, ENOENT if there
95
 *         is no task matching the specified ID or the physical address space
96
 *         is not enabled for mapping and ENOMEM if there was a problem in
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 *         creating address space area.
98
 *
1178 jermar 99
 */
1780 jermar 100
static int ddi_physmem_map(uintptr_t pf, uintptr_t vp, count_t pages, int flags)
1178 jermar 101
{
4055 trochtova 102
    ASSERT(TASK);
103
    ASSERT((pf % FRAME_SIZE) == 0);
104
    ASSERT((vp % PAGE_SIZE) == 0);
1178 jermar 105
 
106
    /*
107
     * Make sure the caller is authorised to make this syscall.
108
     */
4055 trochtova 109
    cap_t caps = cap_get(TASK);
1178 jermar 110
    if (!(caps & CAP_MEM_MANAGER))
111
        return EPERM;
4055 trochtova 112
 
113
    mem_backend_data_t backend_data;
114
    backend_data.base = pf;
115
    backend_data.frames = pages;
116
 
117
    ipl_t ipl = interrupts_disable();
118
 
119
    /* Find the zone of the physical memory */
120
    spinlock_lock(&zones.lock);
121
    count_t znum = find_zone(ADDR2PFN(pf), pages, 0);
122
 
123
    if (znum == (count_t) -1) {
124
        /* Frames not found in any zones
125
         * -> assume it is hardware device and allow mapping
2015 jermar 126
         */
4055 trochtova 127
        spinlock_unlock(&zones.lock);
128
        goto map;
129
    }
130
 
131
    if (zones.info[znum].flags & ZONE_FIRMWARE) {
132
        /* Frames are part of firmware */
133
        spinlock_unlock(&zones.lock);
134
        goto map;
135
    }
136
 
137
    if (zone_flags_available(zones.info[znum].flags)) {
138
        /* Frames are part of physical memory, check if the memory
139
         * region is enabled for mapping.
140
         */
141
        spinlock_unlock(&zones.lock);
142
 
143
        spinlock_lock(&parea_lock);
144
        btree_node_t *nodep;
145
        parea_t *parea = (parea_t *) btree_search(&parea_btree,
146
            (btree_key_t) pf, &nodep);
147
 
148
        if ((!parea) || (parea->frames < pages))
149
            goto err;
150
 
2015 jermar 151
        spinlock_unlock(&parea_lock);
4055 trochtova 152
        goto map;
2015 jermar 153
    }
4055 trochtova 154
 
155
err:
156
    spinlock_unlock(&zones.lock);
157
    interrupts_restore(ipl);
158
    return ENOENT;
159
 
160
map:
1494 palkovsky 161
    spinlock_lock(&TASK->lock);
1178 jermar 162
 
4055 trochtova 163
    if (!as_area_create(TASK->as, flags, pages * PAGE_SIZE, vp,
164
        AS_AREA_ATTR_NONE, &phys_backend, &backend_data)) {
1178 jermar 165
        /*
166
         * The address space area could not have been created.
167
         * We report it using ENOMEM.
168
         */
1494 palkovsky 169
        spinlock_unlock(&TASK->lock);
1178 jermar 170
        interrupts_restore(ipl);
171
        return ENOMEM;
172
    }
173
 
1424 jermar 174
    /*
175
     * Mapping is created on-demand during page fault.
176
     */
177
 
1494 palkovsky 178
    spinlock_unlock(&TASK->lock);
1178 jermar 179
    interrupts_restore(ipl);
180
    return 0;
181
}
182
 
1191 jermar 183
/** Enable range of I/O space for task.
184
 *
185
 * @param id Task ID of the destination task.
186
 * @param ioaddr Starting I/O address.
187
 * @param size Size of the enabled I/O space..
188
 *
2015 jermar 189
 * @return 0 on success, EPERM if the caller lacks capabilities to use this
4055 trochtova 190
 *           syscall, ENOENT if there is no task matching the specified ID.
191
 *
1191 jermar 192
 */
1780 jermar 193
static int ddi_iospace_enable(task_id_t id, uintptr_t ioaddr, size_t size)
1191 jermar 194
{
195
    /*
196
     * Make sure the caller is authorised to make this syscall.
197
     */
4055 trochtova 198
    cap_t caps = cap_get(TASK);
1191 jermar 199
    if (!(caps & CAP_IO_MANAGER))
200
        return EPERM;
201
 
4055 trochtova 202
    ipl_t ipl = interrupts_disable();
1191 jermar 203
    spinlock_lock(&tasks_lock);
204
 
4055 trochtova 205
    task_t *task = task_find_by_id(id);
1191 jermar 206
 
4055 trochtova 207
    if ((!task) || (!context_check(CONTEXT, task->context))) {
1191 jermar 208
        /*
1839 decky 209
         * There is no task with the specified ID
210
         * or the task belongs to a different security
211
         * context.
1191 jermar 212
         */
213
        spinlock_unlock(&tasks_lock);
214
        interrupts_restore(ipl);
215
        return ENOENT;
216
    }
4055 trochtova 217
 
1191 jermar 218
    /* Lock the task and release the lock protecting tasks_btree. */
4055 trochtova 219
    spinlock_lock(&task->lock);
1191 jermar 220
    spinlock_unlock(&tasks_lock);
221
 
4055 trochtova 222
    int rc = ddi_iospace_enable_arch(task, ioaddr, size);
223
 
224
    spinlock_unlock(&task->lock);
1191 jermar 225
    interrupts_restore(ipl);
4055 trochtova 226
 
1191 jermar 227
    return rc;
228
}
229
 
2012 jermar 230
/** Wrapper for SYS_PHYSMEM_MAP syscall.
1178 jermar 231
 *
1494 palkovsky 232
 * @param phys_base Physical base address to map
233
 * @param virt_base Destination virtual address
234
 * @param pages Number of pages
235
 * @param flags Flags of newly mapped pages
1178 jermar 236
 *
237
 * @return 0 on success, otherwise it returns error code found in errno.h
4055 trochtova 238
 *
239
 */
2107 jermar 240
unative_t sys_physmem_map(unative_t phys_base, unative_t virt_base,
241
    unative_t pages, unative_t flags)
1178 jermar 242
{
2015 jermar 243
    return (unative_t) ddi_physmem_map(ALIGN_DOWN((uintptr_t) phys_base,
2107 jermar 244
        FRAME_SIZE), ALIGN_DOWN((uintptr_t) virt_base, PAGE_SIZE),
245
        (count_t) pages, (int) flags);
1178 jermar 246
}
1191 jermar 247
 
248
/** Wrapper for SYS_ENABLE_IOSPACE syscall.
249
 *
1708 jermar 250
 * @param uspace_io_arg User space address of DDI argument structure.
1191 jermar 251
 *
252
 * @return 0 on success, otherwise it returns error code found in errno.h
4055 trochtova 253
 *
254
 */
1780 jermar 255
unative_t sys_iospace_enable(ddi_ioarg_t *uspace_io_arg)
1191 jermar 256
{
257
    ddi_ioarg_t arg;
4055 trochtova 258
    int rc = copy_from_uspace(&arg, uspace_io_arg, sizeof(ddi_ioarg_t));
1288 jermar 259
    if (rc != 0)
1780 jermar 260
        return (unative_t) rc;
4055 trochtova 261
 
2015 jermar 262
    return (unative_t) ddi_iospace_enable((task_id_t) arg.task_id,
2107 jermar 263
        (uintptr_t) arg.ioaddr, (size_t) arg.size);
1191 jermar 264
}
1297 jermar 265
 
266
/** Disable or enable preemption.
267
 *
2015 jermar 268
 * @param enable If non-zero, the preemption counter will be decremented,
4055 trochtova 269
 *               leading to potential enabling of preemption. Otherwise
270
 *               the preemption counter will be incremented, preventing
271
 *               preemption from occurring.
1297 jermar 272
 *
273
 * @return Zero on success or EPERM if callers capabilities are not sufficient.
4055 trochtova 274
 *
275
 */
1780 jermar 276
unative_t sys_preempt_control(int enable)
1297 jermar 277
{
4055 trochtova 278
    if (!cap_get(TASK) & CAP_PREEMPT_CONTROL)
279
        return EPERM;
280
 
281
    if (enable)
282
        preemption_enable();
283
    else
284
        preemption_disable();
285
 
286
    return 0;
1297 jermar 287
}
1702 cejka 288
 
1888 jermar 289
/** @}
1702 cejka 290
 */