Rev 1191 | Go to most recent revision | Details | Last modification | View Log | RSS feed
| Rev | Author | Line No. | Line |
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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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| 28 | |||
| 29 | #include <ddi/ddi.h> |
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| 30 | #include <ddi/ddi_arg.h> |
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| 31 | #include <proc/task.h> |
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| 32 | #include <security/cap.h> |
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| 33 | #include <mm/frame.h> |
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| 34 | #include <mm/page.h> |
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| 35 | #include <mm/as.h> |
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| 36 | #include <synch/spinlock.h> |
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| 37 | #include <arch.h> |
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| 38 | #include <align.h> |
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| 39 | #include <errno.h> |
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| 40 | |||
| 41 | /** Map piece of physical memory into virtual address space of specified task. |
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| 42 | * |
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| 43 | * @param id Task ID of the destination task. |
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| 44 | * @param pf Physical frame address of the starting frame. |
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| 45 | * @param vp Virtual page address of the starting page. |
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| 46 | * @param pages Number of pages to map. |
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| 47 | * @param writable If true, the mapping will be created writable. |
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| 48 | * |
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| 49 | * @return 0 on success, EPERM if the caller lacks capabilities to use this syscall, |
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| 50 | * ENOENT if there is no task matching the specified ID and ENOMEM if |
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| 51 | * there was a problem in creating address space area. |
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| 52 | */ |
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| 53 | static int ddi_map_physmem(task_id_t id, __address pf, __address vp, count_t pages, bool writable) |
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| 54 | { |
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| 55 | ipl_t ipl; |
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| 56 | cap_t caps; |
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| 57 | task_t *t; |
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| 58 | int flags; |
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| 59 | count_t i; |
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| 60 | |||
| 61 | /* |
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| 62 | * Make sure the caller is authorised to make this syscall. |
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| 63 | */ |
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| 64 | caps = cap_get(TASK); |
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| 65 | if (!(caps & CAP_MEM_MANAGER)) |
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| 66 | return EPERM; |
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| 67 | |||
| 68 | ipl = interrupts_disable(); |
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| 69 | spinlock_lock(&tasks_lock); |
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| 70 | |||
| 71 | t = task_find_by_id(id); |
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| 72 | |||
| 73 | if (!t) { |
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| 74 | /* |
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| 75 | * There is no task with the specified ID. |
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| 76 | */ |
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| 77 | spinlock_unlock(&tasks_lock); |
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| 78 | interrupts_restore(ipl); |
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| 79 | return ENOENT; |
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| 80 | } |
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| 81 | |||
| 82 | /* |
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| 83 | * TODO: We are currently lacking support for task destroying. |
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| 84 | * Once it is added to the kernel, we must take care to |
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| 85 | * synchronize in a way that prevents race conditions here. |
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| 86 | */ |
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| 87 | |||
| 88 | /* Lock the task and release the lock protecting tasks_btree. */ |
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| 89 | spinlock_lock(&t->lock); |
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| 90 | spinlock_unlock(&tasks_lock); |
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| 91 | |||
| 92 | flags = AS_AREA_DEVICE | AS_AREA_READ; |
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| 93 | if (writable) |
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| 94 | flags |= AS_AREA_WRITE; |
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| 95 | if (!as_area_create(t->as, flags, pages * PAGE_SIZE, vp)) { |
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| 96 | /* |
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| 97 | * The address space area could not have been created. |
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| 98 | * We report it using ENOMEM. |
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| 99 | */ |
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| 100 | spinlock_unlock(&t->lock); |
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| 101 | interrupts_restore(ipl); |
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| 102 | return ENOMEM; |
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| 103 | } |
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| 104 | |||
| 105 | /* Initialize page tables. */ |
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| 106 | for (i = 0; i < pages; i++) |
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| 107 | as_set_mapping(t->as, vp + i * PAGE_SIZE, pf + i * FRAME_SIZE); |
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| 108 | |||
| 109 | spinlock_unlock(&t->lock); |
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| 110 | interrupts_restore(ipl); |
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| 111 | return 0; |
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| 112 | } |
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| 113 | |||
| 114 | /** Wrapper for SYS_MAP_PHYSMEM syscall. |
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| 115 | * |
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| 116 | * @param User space address of DDI argument structure. |
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| 117 | * |
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| 118 | * @return 0 on success, otherwise it returns error code found in errno.h |
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| 119 | */ |
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| 120 | __native sys_map_physmem(ddi_arg_t *uspace_ddi_arg) |
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| 121 | { |
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| 122 | ddi_arg_t arg; |
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| 123 | |||
| 124 | copy_from_uspace(&arg, uspace_ddi_arg, sizeof(ddi_arg_t)); |
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| 125 | return (__native) ddi_map_physmem((task_id_t) arg.task_id, ALIGN_DOWN((__address) arg.phys_base, FRAME_SIZE), |
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| 126 | ALIGN_DOWN((__address) arg.virt_base, PAGE_SIZE), (count_t) arg.pages, |
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| 127 | (bool) arg.writable); |
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| 128 | } |