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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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| 1702 | cejka | 28 | |
| 1705 | cejka | 29 | /** @addtogroup genericddi |
| 1702 | cejka | 30 | * @{ |
| 31 | */ |
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| 1248 | jermar | 32 | |
| 33 | /** |
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| 1702 | cejka | 34 | * @file |
| 1248 | jermar | 35 | * @brief Device Driver Interface functions. |
| 36 | * |
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| 37 | * This file contains functions that comprise the Device Driver Interface. |
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| 38 | * These are the functions for mapping physical memory and enabling I/O |
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| 39 | * space to tasks. |
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| 40 | */ |
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| 1178 | jermar | 41 | |
| 42 | #include <ddi/ddi.h> |
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| 43 | #include <ddi/ddi_arg.h> |
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| 44 | #include <proc/task.h> |
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| 45 | #include <security/cap.h> |
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| 46 | #include <mm/frame.h> |
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| 47 | #include <mm/as.h> |
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| 48 | #include <synch/spinlock.h> |
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| 1288 | jermar | 49 | #include <syscall/copy.h> |
| 1178 | jermar | 50 | #include <arch.h> |
| 51 | #include <align.h> |
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| 52 | #include <errno.h> |
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| 53 | |||
| 1494 | palkovsky | 54 | /** Map piece of physical memory into virtual address space of current task. |
| 1178 | jermar | 55 | * |
| 56 | * @param pf Physical frame address of the starting frame. |
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| 57 | * @param vp Virtual page address of the starting page. |
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| 58 | * @param pages Number of pages to map. |
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| 1429 | jermar | 59 | * @param flags Address space area flags for the mapping. |
| 1178 | jermar | 60 | * |
| 61 | * @return 0 on success, EPERM if the caller lacks capabilities to use this syscall, |
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| 62 | * ENOENT if there is no task matching the specified ID and ENOMEM if |
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| 63 | * there was a problem in creating address space area. |
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| 64 | */ |
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| 1494 | palkovsky | 65 | static int ddi_physmem_map(__address pf, __address vp, count_t pages, int flags) |
| 1178 | jermar | 66 | { |
| 67 | ipl_t ipl; |
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| 68 | cap_t caps; |
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| 1425 | jermar | 69 | mem_backend_data_t backend_data; |
| 70 | |||
| 71 | backend_data.base = pf; |
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| 72 | backend_data.frames = pages; |
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| 1178 | jermar | 73 | |
| 74 | /* |
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| 75 | * Make sure the caller is authorised to make this syscall. |
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| 76 | */ |
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| 77 | caps = cap_get(TASK); |
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| 78 | if (!(caps & CAP_MEM_MANAGER)) |
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| 79 | return EPERM; |
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| 1494 | palkovsky | 80 | |
| 1178 | jermar | 81 | ipl = interrupts_disable(); |
| 1494 | palkovsky | 82 | spinlock_lock(&TASK->lock); |
| 1178 | jermar | 83 | |
| 1494 | palkovsky | 84 | if (!as_area_create(TASK->as, flags, pages * PAGE_SIZE, vp, AS_AREA_ATTR_NONE, |
| 1424 | jermar | 85 | &phys_backend, &backend_data)) { |
| 1178 | jermar | 86 | /* |
| 87 | * The address space area could not have been created. |
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| 88 | * We report it using ENOMEM. |
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| 89 | */ |
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| 1494 | palkovsky | 90 | spinlock_unlock(&TASK->lock); |
| 1178 | jermar | 91 | interrupts_restore(ipl); |
| 92 | return ENOMEM; |
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| 93 | } |
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| 94 | |||
| 1424 | jermar | 95 | /* |
| 96 | * Mapping is created on-demand during page fault. |
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| 97 | */ |
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| 98 | |||
| 1494 | palkovsky | 99 | spinlock_unlock(&TASK->lock); |
| 1178 | jermar | 100 | interrupts_restore(ipl); |
| 101 | return 0; |
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| 102 | } |
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| 103 | |||
| 1191 | jermar | 104 | /** Enable range of I/O space for task. |
| 105 | * |
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| 106 | * @param id Task ID of the destination task. |
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| 107 | * @param ioaddr Starting I/O address. |
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| 108 | * @param size Size of the enabled I/O space.. |
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| 109 | * |
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| 110 | * @return 0 on success, EPERM if the caller lacks capabilities to use this syscall, |
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| 111 | * ENOENT if there is no task matching the specified ID. |
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| 112 | */ |
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| 1227 | jermar | 113 | static int ddi_iospace_enable(task_id_t id, __address ioaddr, size_t size) |
| 1191 | jermar | 114 | { |
| 115 | ipl_t ipl; |
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| 116 | cap_t caps; |
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| 117 | task_t *t; |
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| 118 | int rc; |
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| 119 | |||
| 120 | /* |
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| 121 | * Make sure the caller is authorised to make this syscall. |
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| 122 | */ |
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| 123 | caps = cap_get(TASK); |
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| 124 | if (!(caps & CAP_IO_MANAGER)) |
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| 125 | return EPERM; |
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| 126 | |||
| 127 | ipl = interrupts_disable(); |
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| 128 | spinlock_lock(&tasks_lock); |
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| 129 | |||
| 130 | t = task_find_by_id(id); |
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| 131 | |||
| 132 | if (!t) { |
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| 133 | /* |
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| 134 | * There is no task with the specified ID. |
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| 135 | */ |
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| 136 | spinlock_unlock(&tasks_lock); |
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| 137 | interrupts_restore(ipl); |
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| 138 | return ENOENT; |
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| 139 | } |
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| 140 | |||
| 141 | /* Lock the task and release the lock protecting tasks_btree. */ |
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| 142 | spinlock_lock(&t->lock); |
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| 143 | spinlock_unlock(&tasks_lock); |
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| 144 | |||
| 1227 | jermar | 145 | rc = ddi_iospace_enable_arch(t, ioaddr, size); |
| 1191 | jermar | 146 | |
| 147 | spinlock_unlock(&t->lock); |
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| 148 | interrupts_restore(ipl); |
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| 149 | return rc; |
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| 150 | } |
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| 151 | |||
| 1178 | jermar | 152 | /** Wrapper for SYS_MAP_PHYSMEM syscall. |
| 153 | * |
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| 1494 | palkovsky | 154 | * @param phys_base Physical base address to map |
| 155 | * @param virt_base Destination virtual address |
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| 156 | * @param pages Number of pages |
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| 157 | * @param flags Flags of newly mapped pages |
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| 1178 | jermar | 158 | * |
| 159 | * @return 0 on success, otherwise it returns error code found in errno.h |
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| 160 | */ |
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| 1494 | palkovsky | 161 | __native sys_physmem_map(__native phys_base, __native virt_base, __native pages, |
| 162 | __native flags) |
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| 1178 | jermar | 163 | { |
| 1494 | palkovsky | 164 | return (__native) ddi_physmem_map(ALIGN_DOWN((__address) phys_base, FRAME_SIZE), |
| 165 | ALIGN_DOWN((__address) virt_base, PAGE_SIZE), (count_t) pages, |
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| 166 | (int) flags); |
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| 1178 | jermar | 167 | } |
| 1191 | jermar | 168 | |
| 169 | /** Wrapper for SYS_ENABLE_IOSPACE syscall. |
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| 170 | * |
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| 171 | * @param User space address of DDI argument structure. |
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| 172 | * |
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| 173 | * @return 0 on success, otherwise it returns error code found in errno.h |
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| 174 | */ |
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| 1227 | jermar | 175 | __native sys_iospace_enable(ddi_ioarg_t *uspace_io_arg) |
| 1191 | jermar | 176 | { |
| 177 | ddi_ioarg_t arg; |
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| 1288 | jermar | 178 | int rc; |
| 1191 | jermar | 179 | |
| 1288 | jermar | 180 | rc = copy_from_uspace(&arg, uspace_io_arg, sizeof(ddi_ioarg_t)); |
| 181 | if (rc != 0) |
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| 182 | return (__native) rc; |
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| 183 | |||
| 1227 | jermar | 184 | return (__native) ddi_iospace_enable((task_id_t) arg.task_id, (__address) arg.ioaddr, (size_t) arg.size); |
| 1191 | jermar | 185 | } |
| 1297 | jermar | 186 | |
| 187 | /** Disable or enable preemption. |
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| 188 | * |
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| 189 | * @param enable If non-zero, the preemption counter will be decremented, leading to potential |
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| 190 | * enabling of preemption. Otherwise the preemption counter will be incremented, |
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| 191 | * preventing preemption from occurring. |
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| 192 | * |
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| 193 | * @return Zero on success or EPERM if callers capabilities are not sufficient. |
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| 194 | */ |
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| 195 | __native sys_preempt_control(int enable) |
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| 196 | { |
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| 197 | if (! cap_get(TASK) & CAP_PREEMPT_CONTROL) |
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| 198 | return EPERM; |
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| 199 | if (enable) |
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| 200 | preemption_enable(); |
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| 201 | else |
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| 202 | preemption_disable(); |
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| 203 | return 0; |
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| 204 | } |
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| 1702 | cejka | 205 | |
| 206 | /** @} |
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| 207 | */ |
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| 208 |