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/*
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/*
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 * Copyright (C) 2006 Jakub Jermar
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 * Copyright (C) 2006 Jakub Jermar
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 * All rights reserved.
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 * All rights reserved.
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 *
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions
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 * modification, are permitted provided that the following conditions
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 * are met:
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 * are met:
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 *
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 *
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 * - Redistributions of source code must retain the above copyright
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 * - Redistributions of source code must retain the above copyright
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 *   notice, this list of conditions and the following disclaimer.
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 *   notice, this list of conditions and the following disclaimer.
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 * - Redistributions in binary form must reproduce the above copyright
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 * - Redistributions in binary form must reproduce the above copyright
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 *   notice, this list of conditions and the following disclaimer in the
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 *   notice, this list of conditions and the following disclaimer in the
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 *   documentation and/or other materials provided with the distribution.
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 *   documentation and/or other materials provided with the distribution.
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 * - The name of the author may not be used to endorse or promote products
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 * - The name of the author may not be used to endorse or promote products
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 *   derived from this software without specific prior written permission.
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 *   derived from this software without specific prior written permission.
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 *
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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 * 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
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 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 */
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 */
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/**
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/**
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 * @file    ddi.c
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 * @file    ddi.c
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 * @brief   Device Driver Interface functions.
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 * @brief   Device Driver Interface functions.
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 *
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 *
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 * This file contains functions that comprise the Device Driver Interface.
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 * This file contains functions that comprise the Device Driver Interface.
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 * These are the functions for mapping physical memory and enabling I/O
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 * These are the functions for mapping physical memory and enabling I/O
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 * space to tasks.
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 * space to tasks.
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 */
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 */
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37
 
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#include <ddi/ddi.h>
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#include <ddi/ddi.h>
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#include <ddi/ddi_arg.h>
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#include <ddi/ddi_arg.h>
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#include <proc/task.h>
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#include <proc/task.h>
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#include <security/cap.h>
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#include <security/cap.h>
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#include <mm/frame.h>
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#include <mm/frame.h>
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#include <mm/as.h>
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#include <mm/as.h>
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#include <synch/spinlock.h>
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#include <synch/spinlock.h>
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#include <syscall/copy.h>
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#include <syscall/copy.h>
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#include <arch.h>
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#include <arch.h>
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#include <align.h>
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#include <align.h>
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#include <errno.h>
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#include <errno.h>
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49
 
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/** Map piece of physical memory into virtual address space of current task.
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/** Map piece of physical memory into virtual address space of current task.
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 *
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 *
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 * @param pf Physical frame address of the starting frame.
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 * @param pf Physical frame address of the starting frame.
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 * @param vp Virtual page address of the starting page.
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 * @param vp Virtual page address of the starting page.
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 * @param pages Number of pages to map.
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 * @param pages Number of pages to map.
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 * @param flags Address space area flags for the mapping.
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 * @param flags Address space area flags for the mapping.
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 *
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 *
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 * @return 0 on success, EPERM if the caller lacks capabilities to use this syscall,
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 * @return 0 on success, EPERM if the caller lacks capabilities to use this syscall,
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 *     ENOENT if there is no task matching the specified ID and ENOMEM if
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 *     ENOENT if there is no task matching the specified ID and ENOMEM if
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 *     there was a problem in creating address space area.
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 *     there was a problem in creating address space area.
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 */
60
 */
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static int ddi_physmem_map(__address pf, __address vp, count_t pages, int flags)
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static int ddi_physmem_map(__address pf, __address vp, count_t pages, int flags)
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{
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{
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    ipl_t ipl;
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    ipl_t ipl;
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    cap_t caps;
64
    cap_t caps;
65
    mem_backend_data_t backend_data;
65
    mem_backend_data_t backend_data;
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66
 
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    backend_data.base = pf;
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    backend_data.base = pf;
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    backend_data.frames = pages;
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    backend_data.frames = pages;
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69
   
70
    /*
70
    /*
71
     * Make sure the caller is authorised to make this syscall.
71
     * Make sure the caller is authorised to make this syscall.
72
     */
72
     */
73
    caps = cap_get(TASK);
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    caps = cap_get(TASK);
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    if (!(caps & CAP_MEM_MANAGER))
74
    if (!(caps & CAP_MEM_MANAGER))
75
        return EPERM;
75
        return EPERM;
76
 
76
 
77
    ipl = interrupts_disable();
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    ipl = interrupts_disable();
78
    /* Lock the task and release the lock protecting tasks_btree. */
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    /* Lock the task and release the lock protecting tasks_btree. */
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    spinlock_lock(&TASK->lock);
79
    spinlock_lock(&TASK->lock);
80
   
80
   
81
    if (!as_area_create(TASK->as, flags, pages * PAGE_SIZE, vp, AS_AREA_ATTR_NONE,
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    if (!as_area_create(TASK->as, flags, pages * PAGE_SIZE, vp, AS_AREA_ATTR_NONE,
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        &phys_backend, &backend_data)) {
82
        &phys_backend, &backend_data)) {
83
        /*
83
        /*
84
         * The address space area could not have been created.
84
         * The address space area could not have been created.
85
         * We report it using ENOMEM.
85
         * We report it using ENOMEM.
86
         */
86
         */
87
        spinlock_unlock(&TASK->lock);
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        spinlock_unlock(&TASK->lock);
88
        interrupts_restore(ipl);
88
        interrupts_restore(ipl);
89
        return ENOMEM;
89
        return ENOMEM;
90
    }
90
    }
91
   
91
   
92
    /*
92
    /*
93
     * Mapping is created on-demand during page fault.
93
     * Mapping is created on-demand during page fault.
94
     */
94
     */
95
   
95
   
96
    spinlock_unlock(&TASK->lock);
96
    spinlock_unlock(&TASK->lock);
97
    interrupts_restore(ipl);
97
    interrupts_restore(ipl);
98
    return 0;
98
    return 0;
99
}
99
}
100
 
100
 
101
/** Enable range of I/O space for task.
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/** Enable range of I/O space for task.
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 *
102
 *
103
 * @param id Task ID of the destination task.
103
 * @param id Task ID of the destination task.
104
 * @param ioaddr Starting I/O address.
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 * @param ioaddr Starting I/O address.
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 * @param size Size of the enabled I/O space..
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 * @param size Size of the enabled I/O space..
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 *
106
 *
107
 * @return 0 on success, EPERM if the caller lacks capabilities to use this syscall,
107
 * @return 0 on success, EPERM if the caller lacks capabilities to use this syscall,
108
 *     ENOENT if there is no task matching the specified ID.
108
 *     ENOENT if there is no task matching the specified ID.
109
 */
109
 */
110
static int ddi_iospace_enable(task_id_t id, __address ioaddr, size_t size)
110
static int ddi_iospace_enable(task_id_t id, __address ioaddr, size_t size)
111
{
111
{
112
    ipl_t ipl;
112
    ipl_t ipl;
113
    cap_t caps;
113
    cap_t caps;
114
    task_t *t;
114
    task_t *t;
115
    int rc;
115
    int rc;
116
   
116
   
117
    /*
117
    /*
118
     * Make sure the caller is authorised to make this syscall.
118
     * Make sure the caller is authorised to make this syscall.
119
     */
119
     */
120
    caps = cap_get(TASK);
120
    caps = cap_get(TASK);
121
    if (!(caps & CAP_IO_MANAGER))
121
    if (!(caps & CAP_IO_MANAGER))
122
        return EPERM;
122
        return EPERM;
123
   
123
   
124
    ipl = interrupts_disable();
124
    ipl = interrupts_disable();
125
    spinlock_lock(&tasks_lock);
125
    spinlock_lock(&tasks_lock);
126
   
126
   
127
    t = task_find_by_id(id);
127
    t = task_find_by_id(id);
128
   
128
   
129
    if (!t) {
129
    if (!t) {
130
        /*
130
        /*
131
         * There is no task with the specified ID.
131
         * There is no task with the specified ID.
132
         */
132
         */
133
        spinlock_unlock(&tasks_lock);
133
        spinlock_unlock(&tasks_lock);
134
        interrupts_restore(ipl);
134
        interrupts_restore(ipl);
135
        return ENOENT;
135
        return ENOENT;
136
    }
136
    }
137
 
137
 
138
    /*
-
 
139
     * TODO: We are currently lacking support for task destroying.
-
 
140
     * Once it is added to the kernel, we must take care to
-
 
141
     * synchronize in a way that prevents race conditions here.
-
 
142
     */
-
 
143
   
-
 
144
    /* Lock the task and release the lock protecting tasks_btree. */
138
    /* Lock the task and release the lock protecting tasks_btree. */
145
    spinlock_lock(&t->lock);
139
    spinlock_lock(&t->lock);
146
    spinlock_unlock(&tasks_lock);
140
    spinlock_unlock(&tasks_lock);
147
 
141
 
148
    rc = ddi_iospace_enable_arch(t, ioaddr, size);
142
    rc = ddi_iospace_enable_arch(t, ioaddr, size);
149
   
143
   
150
    spinlock_unlock(&t->lock);
144
    spinlock_unlock(&t->lock);
151
    interrupts_restore(ipl);
145
    interrupts_restore(ipl);
152
    return rc;
146
    return rc;
153
}
147
}
154
 
148
 
155
/** Wrapper for SYS_MAP_PHYSMEM syscall.
149
/** Wrapper for SYS_MAP_PHYSMEM syscall.
156
 *
150
 *
157
 * @param phys_base Physical base address to map
151
 * @param phys_base Physical base address to map
158
 * @param virt_base Destination virtual address
152
 * @param virt_base Destination virtual address
159
 * @param pages Number of pages
153
 * @param pages Number of pages
160
 * @param flags Flags of newly mapped pages
154
 * @param flags Flags of newly mapped pages
161
 *
155
 *
162
 * @return 0 on success, otherwise it returns error code found in errno.h
156
 * @return 0 on success, otherwise it returns error code found in errno.h
163
 */
157
 */
164
__native sys_physmem_map(__native phys_base, __native virt_base, __native pages,
158
__native sys_physmem_map(__native phys_base, __native virt_base, __native pages,
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             __native flags)
159
             __native flags)
166
{
160
{
167
    return (__native) ddi_physmem_map(ALIGN_DOWN((__address) phys_base, FRAME_SIZE),
161
    return (__native) ddi_physmem_map(ALIGN_DOWN((__address) phys_base, FRAME_SIZE),
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                      ALIGN_DOWN((__address) virt_base, PAGE_SIZE), (count_t) pages,
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                      ALIGN_DOWN((__address) virt_base, PAGE_SIZE), (count_t) pages,
169
                      (int) flags);
163
                      (int) flags);
170
}
164
}
171
 
165
 
172
/** Wrapper for SYS_ENABLE_IOSPACE syscall.
166
/** Wrapper for SYS_ENABLE_IOSPACE syscall.
173
 *
167
 *
174
 * @param User space address of DDI argument structure.
168
 * @param User space address of DDI argument structure.
175
 *
169
 *
176
 * @return 0 on success, otherwise it returns error code found in errno.h
170
 * @return 0 on success, otherwise it returns error code found in errno.h
177
 */
171
 */
178
__native sys_iospace_enable(ddi_ioarg_t *uspace_io_arg)
172
__native sys_iospace_enable(ddi_ioarg_t *uspace_io_arg)
179
{
173
{
180
    ddi_ioarg_t arg;
174
    ddi_ioarg_t arg;
181
    int rc;
175
    int rc;
182
   
176
   
183
    rc = copy_from_uspace(&arg, uspace_io_arg, sizeof(ddi_ioarg_t));
177
    rc = copy_from_uspace(&arg, uspace_io_arg, sizeof(ddi_ioarg_t));
184
    if (rc != 0)
178
    if (rc != 0)
185
        return (__native) rc;
179
        return (__native) rc;
186
       
180
       
187
    return (__native) ddi_iospace_enable((task_id_t) arg.task_id, (__address) arg.ioaddr, (size_t) arg.size);
181
    return (__native) ddi_iospace_enable((task_id_t) arg.task_id, (__address) arg.ioaddr, (size_t) arg.size);
188
}
182
}
189
 
183
 
190
/** Disable or enable preemption.
184
/** Disable or enable preemption.
191
 *
185
 *
192
 * @param enable If non-zero, the preemption counter will be decremented, leading to potential
186
 * @param enable If non-zero, the preemption counter will be decremented, leading to potential
193
 *       enabling of preemption. Otherwise the preemption counter will be incremented,
187
 *       enabling of preemption. Otherwise the preemption counter will be incremented,
194
 *       preventing preemption from occurring.
188
 *       preventing preemption from occurring.
195
 *
189
 *
196
 * @return Zero on success or EPERM if callers capabilities are not sufficient.
190
 * @return Zero on success or EPERM if callers capabilities are not sufficient.
197
 */
191
 */
198
__native sys_preempt_control(int enable)
192
__native sys_preempt_control(int enable)
199
{
193
{
200
        if (! cap_get(TASK) & CAP_PREEMPT_CONTROL)
194
        if (! cap_get(TASK) & CAP_PREEMPT_CONTROL)
201
                return EPERM;
195
                return EPERM;
202
        if (enable)
196
        if (enable)
203
                preemption_enable();
197
                preemption_enable();
204
        else
198
        else
205
                preemption_disable();
199
                preemption_disable();
206
        return 0;
200
        return 0;
207
}
201
}
208
 
202