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| 1178 | jermar | 1 | /* |
| 2 | * Copyright (C) 2006 Jakub Jermar |
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| 3 | * All rights reserved. |
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| 4 | * |
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| 5 | * Redistribution and use in source and binary forms, with or without |
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| 6 | * modification, are permitted provided that the following conditions |
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| 7 | * are met: |
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| 8 | * |
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| 9 | * - Redistributions of source code must retain the above copyright |
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| 10 | * notice, this list of conditions and the following disclaimer. |
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| 11 | * - Redistributions in binary form must reproduce the above copyright |
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| 12 | * notice, this list of conditions and the following disclaimer in the |
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| 13 | * documentation and/or other materials provided with the distribution. |
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| 14 | * - The name of the author may not be used to endorse or promote products |
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| 15 | * derived from this software without specific prior written permission. |
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| 16 | * |
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| 17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
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| 18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
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| 19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
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| 20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
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| 21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
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| 22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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| 23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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| 24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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| 25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
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| 26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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| 27 | */ |
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| 1248 | jermar | 28 | |
| 29 | /** |
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| 30 | * @file ddi.c |
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| 31 | * @brief Device Driver Interface functions. |
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| 32 | * |
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| 33 | * This file contains functions that comprise the Device Driver Interface. |
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| 34 | * These are the functions for mapping physical memory and enabling I/O |
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| 35 | * space to tasks. |
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| 36 | */ |
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| 1178 | jermar | 37 | |
| 38 | #include <ddi/ddi.h> |
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| 39 | #include <ddi/ddi_arg.h> |
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| 40 | #include <proc/task.h> |
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| 41 | #include <security/cap.h> |
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| 42 | #include <mm/frame.h> |
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| 43 | #include <mm/as.h> |
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| 44 | #include <synch/spinlock.h> |
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| 1288 | jermar | 45 | #include <syscall/copy.h> |
| 1178 | jermar | 46 | #include <arch.h> |
| 47 | #include <align.h> |
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| 48 | #include <errno.h> |
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| 49 | |||
| 1494 | palkovsky | 50 | /** Map piece of physical memory into virtual address space of current task. |
| 1178 | jermar | 51 | * |
| 52 | * @param pf Physical frame address of the starting frame. |
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| 53 | * @param vp Virtual page address of the starting page. |
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| 54 | * @param pages Number of pages to map. |
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| 1429 | jermar | 55 | * @param flags Address space area flags for the mapping. |
| 1178 | jermar | 56 | * |
| 57 | * @return 0 on success, EPERM if the caller lacks capabilities to use this syscall, |
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| 58 | * ENOENT if there is no task matching the specified ID and ENOMEM if |
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| 59 | * there was a problem in creating address space area. |
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| 60 | */ |
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| 1494 | palkovsky | 61 | static int ddi_physmem_map(__address pf, __address vp, count_t pages, int flags) |
| 1178 | jermar | 62 | { |
| 63 | ipl_t ipl; |
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| 64 | cap_t caps; |
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| 1425 | jermar | 65 | mem_backend_data_t backend_data; |
| 66 | |||
| 67 | backend_data.base = pf; |
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| 68 | backend_data.frames = pages; |
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| 1178 | jermar | 69 | |
| 70 | /* |
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| 71 | * Make sure the caller is authorised to make this syscall. |
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| 72 | */ |
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| 73 | caps = cap_get(TASK); |
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| 74 | if (!(caps & CAP_MEM_MANAGER)) |
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| 75 | return EPERM; |
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| 1494 | palkovsky | 76 | |
| 1178 | jermar | 77 | ipl = interrupts_disable(); |
| 78 | /* Lock the task and release the lock protecting tasks_btree. */ |
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| 1494 | palkovsky | 79 | spinlock_lock(&TASK->lock); |
| 1178 | jermar | 80 | |
| 1494 | palkovsky | 81 | if (!as_area_create(TASK->as, flags, pages * PAGE_SIZE, vp, AS_AREA_ATTR_NONE, |
| 1424 | jermar | 82 | &phys_backend, &backend_data)) { |
| 1178 | jermar | 83 | /* |
| 84 | * The address space area could not have been created. |
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| 85 | * We report it using ENOMEM. |
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| 86 | */ |
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| 1494 | palkovsky | 87 | spinlock_unlock(&TASK->lock); |
| 1178 | jermar | 88 | interrupts_restore(ipl); |
| 89 | return ENOMEM; |
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| 90 | } |
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| 91 | |||
| 1424 | jermar | 92 | /* |
| 93 | * Mapping is created on-demand during page fault. |
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| 94 | */ |
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| 95 | |||
| 1494 | palkovsky | 96 | spinlock_unlock(&TASK->lock); |
| 1178 | jermar | 97 | interrupts_restore(ipl); |
| 98 | return 0; |
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| 99 | } |
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| 100 | |||
| 1191 | jermar | 101 | /** Enable range of I/O space for task. |
| 102 | * |
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| 103 | * @param id Task ID of the destination task. |
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| 104 | * @param ioaddr Starting I/O address. |
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| 105 | * @param size Size of the enabled I/O space.. |
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| 106 | * |
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| 107 | * @return 0 on success, EPERM if the caller lacks capabilities to use this syscall, |
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| 108 | * ENOENT if there is no task matching the specified ID. |
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| 109 | */ |
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| 1227 | jermar | 110 | static int ddi_iospace_enable(task_id_t id, __address ioaddr, size_t size) |
| 1191 | jermar | 111 | { |
| 112 | ipl_t ipl; |
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| 113 | cap_t caps; |
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| 114 | task_t *t; |
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| 115 | int rc; |
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| 116 | |||
| 117 | /* |
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| 118 | * Make sure the caller is authorised to make this syscall. |
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| 119 | */ |
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| 120 | caps = cap_get(TASK); |
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| 121 | if (!(caps & CAP_IO_MANAGER)) |
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| 122 | return EPERM; |
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| 123 | |||
| 124 | ipl = interrupts_disable(); |
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| 125 | spinlock_lock(&tasks_lock); |
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| 126 | |||
| 127 | t = task_find_by_id(id); |
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| 128 | |||
| 129 | if (!t) { |
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| 130 | /* |
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| 131 | * There is no task with the specified ID. |
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| 132 | */ |
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| 133 | spinlock_unlock(&tasks_lock); |
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| 134 | interrupts_restore(ipl); |
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| 135 | return ENOENT; |
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| 136 | } |
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| 137 | |||
| 138 | /* |
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| 139 | * TODO: We are currently lacking support for task destroying. |
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| 140 | * Once it is added to the kernel, we must take care to |
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| 141 | * synchronize in a way that prevents race conditions here. |
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| 142 | */ |
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| 143 | |||
| 144 | /* Lock the task and release the lock protecting tasks_btree. */ |
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| 145 | spinlock_lock(&t->lock); |
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| 146 | spinlock_unlock(&tasks_lock); |
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| 147 | |||
| 1227 | jermar | 148 | rc = ddi_iospace_enable_arch(t, ioaddr, size); |
| 1191 | jermar | 149 | |
| 150 | spinlock_unlock(&t->lock); |
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| 151 | interrupts_restore(ipl); |
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| 152 | return rc; |
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| 153 | } |
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| 154 | |||
| 1178 | jermar | 155 | /** Wrapper for SYS_MAP_PHYSMEM syscall. |
| 156 | * |
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| 1494 | palkovsky | 157 | * @param phys_base Physical base address to map |
| 158 | * @param virt_base Destination virtual address |
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| 159 | * @param pages Number of pages |
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| 160 | * @param flags Flags of newly mapped pages |
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| 1178 | jermar | 161 | * |
| 162 | * @return 0 on success, otherwise it returns error code found in errno.h |
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| 163 | */ |
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| 1494 | palkovsky | 164 | __native sys_physmem_map(__native phys_base, __native virt_base, __native pages, |
| 165 | __native flags) |
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| 1178 | jermar | 166 | { |
| 1494 | palkovsky | 167 | return (__native) ddi_physmem_map(ALIGN_DOWN((__address) phys_base, FRAME_SIZE), |
| 168 | ALIGN_DOWN((__address) virt_base, PAGE_SIZE), (count_t) pages, |
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| 169 | (int) flags); |
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| 1178 | jermar | 170 | } |
| 1191 | jermar | 171 | |
| 172 | /** Wrapper for SYS_ENABLE_IOSPACE syscall. |
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| 173 | * |
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| 174 | * @param User space address of DDI argument structure. |
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| 175 | * |
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| 176 | * @return 0 on success, otherwise it returns error code found in errno.h |
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| 177 | */ |
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| 1227 | jermar | 178 | __native sys_iospace_enable(ddi_ioarg_t *uspace_io_arg) |
| 1191 | jermar | 179 | { |
| 180 | ddi_ioarg_t arg; |
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| 1288 | jermar | 181 | int rc; |
| 1191 | jermar | 182 | |
| 1288 | jermar | 183 | rc = copy_from_uspace(&arg, uspace_io_arg, sizeof(ddi_ioarg_t)); |
| 184 | if (rc != 0) |
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| 185 | return (__native) rc; |
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| 186 | |||
| 1227 | jermar | 187 | return (__native) ddi_iospace_enable((task_id_t) arg.task_id, (__address) arg.ioaddr, (size_t) arg.size); |
| 1191 | jermar | 188 | } |
| 1297 | jermar | 189 | |
| 190 | /** Disable or enable preemption. |
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| 191 | * |
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| 192 | * @param enable If non-zero, the preemption counter will be decremented, leading to potential |
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| 193 | * enabling of preemption. Otherwise the preemption counter will be incremented, |
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| 194 | * preventing preemption from occurring. |
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| 195 | * |
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| 196 | * @return Zero on success or EPERM if callers capabilities are not sufficient. |
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| 197 | */ |
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| 198 | __native sys_preempt_control(int enable) |
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| 199 | { |
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| 200 | if (! cap_get(TASK) & CAP_PREEMPT_CONTROL) |
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| 201 | return EPERM; |
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| 202 | if (enable) |
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| 203 | preemption_enable(); |
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| 204 | else |
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| 205 | preemption_disable(); |
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| 206 | return 0; |
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| 207 | } |