| 1 | /*
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| 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 |
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| 29 | /** @addtogroup kernel_amd64_ddi
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| 30 | * @{
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| 31 | */
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| 32 | /** @file
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| 33 | */
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| 34 |
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| 35 | #include <ddi/ddi.h>
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| 36 | #include <arch/ddi/ddi.h>
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| 37 | #include <proc/task.h>
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| 38 | #include <typedefs.h>
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| 39 | #include <adt/bitmap.h>
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| 40 | #include <stdlib.h>
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| 41 | #include <arch/pm.h>
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| 42 | #include <errno.h>
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| 43 | #include <arch/cpu.h>
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| 44 | #include <cpu.h>
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| 45 | #include <arch.h>
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| 46 | #include <align.h>
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| 47 |
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| 48 | /** Enable I/O space range for task.
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| 49 | *
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| 50 | * Interrupts are disabled and task is locked.
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| 51 | *
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| 52 | * @param task Task.
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| 53 | * @param ioaddr Starting I/O space address.
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| 54 | * @param size Size of the enabled I/O range.
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| 55 | *
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| 56 | * @return EOK on success or an error code from errno.h.
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| 57 | *
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| 58 | */
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| 59 | errno_t ddi_iospace_enable_arch(task_t *task, uintptr_t ioaddr, size_t size)
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| 60 | {
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| 61 | size_t elements = ioaddr + size;
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| 62 | if (elements > IO_PORTS)
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| 63 | return ENOENT;
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| 64 |
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| 65 | if (task->arch.iomap.elements < elements) {
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| 66 | /*
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| 67 | * The I/O permission bitmap is too small and needs to be grown.
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| 68 | */
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| 69 |
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| 70 | void *store = malloc(bitmap_size(elements));
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| 71 | if (!store)
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| 72 | return ENOMEM;
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| 73 |
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| 74 | bitmap_t oldiomap;
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| 75 | bitmap_initialize(&oldiomap, task->arch.iomap.elements,
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| 76 | task->arch.iomap.bits);
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| 77 |
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| 78 | bitmap_initialize(&task->arch.iomap, elements, store);
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| 79 |
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| 80 | /*
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| 81 | * Mark the new range inaccessible.
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| 82 | */
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| 83 | bitmap_set_range(&task->arch.iomap, oldiomap.elements,
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| 84 | elements - oldiomap.elements);
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| 85 |
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| 86 | /*
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| 87 | * In case there really existed smaller iomap,
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| 88 | * copy its contents and deallocate it.
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| 89 | */
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| 90 | if (oldiomap.bits) {
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| 91 | bitmap_copy(&task->arch.iomap, &oldiomap,
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| 92 | oldiomap.elements);
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| 93 |
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| 94 | free(oldiomap.bits);
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| 95 | }
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| 96 | }
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| 97 |
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| 98 | /*
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| 99 | * Enable the range and we are done.
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| 100 | */
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| 101 | bitmap_clear_range(&task->arch.iomap, (size_t) ioaddr, size);
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| 102 |
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| 103 | /*
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| 104 | * Increment I/O Permission bitmap generation counter.
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| 105 | */
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| 106 | task->arch.iomapver++;
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| 107 |
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| 108 | return EOK;
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| 109 | }
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| 110 |
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| 111 | /** Disable I/O space range for task.
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| 112 | *
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| 113 | * Interrupts are disabled and task is locked.
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| 114 | *
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| 115 | * @param task Task.
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| 116 | * @param ioaddr Starting I/O space address.
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| 117 | * @param size Size of the enabled I/O range.
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| 118 | *
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| 119 | * @return EOK on success or an error code from errno.h.
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| 120 | *
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| 121 | */
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| 122 | errno_t ddi_iospace_disable_arch(task_t *task, uintptr_t ioaddr, size_t size)
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| 123 | {
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| 124 | size_t elements = ioaddr + size;
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| 125 | if (elements > IO_PORTS)
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| 126 | return ENOENT;
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| 127 |
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| 128 | if (ioaddr >= task->arch.iomap.elements)
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| 129 | return EINVAL;
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| 130 |
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| 131 | if (task->arch.iomap.elements < elements)
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| 132 | size -= elements - task->arch.iomap.elements;
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| 133 |
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| 134 | /*
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| 135 | * Disable the range.
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| 136 | */
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| 137 | bitmap_set_range(&task->arch.iomap, (size_t) ioaddr, size);
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| 138 |
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| 139 | /*
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| 140 | * Increment I/O Permission bitmap generation counter.
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| 141 | */
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| 142 | task->arch.iomapver++;
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| 143 |
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| 144 | return 0;
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| 145 | }
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| 146 |
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| 147 | /** @}
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| 148 | */
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