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| Rev | Author | Line No. | Line |
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| 1191 | 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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| 1256 | jermar | 30 | #include <arch/ddi/ddi.h> |
| 1191 | jermar | 31 | #include <proc/task.h> |
| 32 | #include <arch/types.h> |
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| 33 | #include <typedefs.h> |
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| 1203 | jermar | 34 | #include <adt/bitmap.h> |
| 35 | #include <mm/slab.h> |
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| 36 | #include <arch/pm.h> |
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| 37 | #include <errno.h> |
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| 1212 | palkovsky | 38 | #include <arch/cpu.h> |
| 1256 | jermar | 39 | #include <cpu.h> |
| 40 | #include <arch.h> |
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| 1263 | jermar | 41 | #include <align.h> |
| 1191 | jermar | 42 | |
| 43 | /** Enable I/O space range for task. |
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| 44 | * |
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| 45 | * Interrupts are disabled and task is locked. |
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| 46 | * |
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| 47 | * @param task Task. |
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| 48 | * @param ioaddr Startign I/O space address. |
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| 49 | * @param size Size of the enabled I/O range. |
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| 50 | * |
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| 51 | * @return 0 on success or an error code from errno.h. |
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| 52 | */ |
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| 1227 | jermar | 53 | int ddi_iospace_enable_arch(task_t *task, __address ioaddr, size_t size) |
| 1191 | jermar | 54 | { |
| 1203 | jermar | 55 | count_t bits; |
| 56 | |||
| 57 | bits = ioaddr + size; |
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| 58 | if (bits > IO_PORTS) |
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| 59 | return ENOENT; |
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| 60 | |||
| 61 | if (task->arch.iomap.bits < bits) { |
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| 62 | bitmap_t oldiomap; |
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| 63 | __u8 *newmap; |
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| 64 | |||
| 65 | /* |
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| 66 | * The I/O permission bitmap is too small and needs to be grown. |
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| 67 | */ |
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| 68 | |||
| 69 | newmap = (__u8 *) malloc(BITS2BYTES(bits), FRAME_ATOMIC); |
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| 70 | if (!newmap) |
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| 71 | return ENOMEM; |
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| 72 | |||
| 73 | bitmap_initialize(&oldiomap, task->arch.iomap.map, task->arch.iomap.bits); |
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| 74 | bitmap_initialize(&task->arch.iomap, newmap, bits); |
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| 75 | |||
| 76 | /* |
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| 77 | * Mark the new range inaccessible. |
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| 78 | */ |
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| 79 | bitmap_set_range(&task->arch.iomap, oldiomap.bits, bits - oldiomap.bits); |
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| 80 | |||
| 81 | /* |
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| 82 | * In case there really existed smaller iomap, |
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| 83 | * copy its contents and deallocate it. |
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| 84 | */ |
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| 85 | if (oldiomap.bits) { |
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| 1261 | jermar | 86 | bitmap_copy(&task->arch.iomap, &oldiomap, oldiomap.bits); |
| 1203 | jermar | 87 | free(oldiomap.map); |
| 88 | } |
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| 89 | } |
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| 90 | |||
| 91 | /* |
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| 92 | * Enable the range and we are done. |
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| 93 | */ |
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| 94 | bitmap_clear_range(&task->arch.iomap, (index_t) ioaddr, (count_t) size); |
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| 95 | |||
| 1256 | jermar | 96 | /* |
| 97 | * Increment I/O Permission bitmap generation counter. |
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| 98 | */ |
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| 99 | task->arch.iomapver++; |
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| 100 | |||
| 1191 | jermar | 101 | return 0; |
| 102 | } |
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| 1212 | palkovsky | 103 | |
| 1256 | jermar | 104 | /** Install I/O Permission bitmap. |
| 105 | * |
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| 106 | * Current task's I/O permission bitmap, if any, is installed |
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| 107 | * in the current CPU's TSS. |
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| 108 | * |
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| 109 | * Interrupts must be disabled prior this call. |
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| 110 | */ |
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| 111 | void io_perm_bitmap_install(void) |
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| 112 | { |
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| 113 | count_t bits; |
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| 114 | ptr_16_32_t cpugdtr; |
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| 115 | descriptor_t *gdt_p; |
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| 116 | count_t ver; |
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| 117 | |||
| 118 | /* First, copy the I/O Permission Bitmap. */ |
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| 119 | spinlock_lock(&TASK->lock); |
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| 120 | ver = TASK->arch.iomapver; |
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| 121 | if ((bits = TASK->arch.iomap.bits)) { |
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| 122 | bitmap_t iomap; |
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| 123 | |||
| 124 | ASSERT(TASK->arch.iomap.map); |
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| 125 | bitmap_initialize(&iomap, CPU->arch.tss->iomap, TSS_IOMAP_SIZE * 8); |
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| 126 | bitmap_copy(&iomap, &TASK->arch.iomap, TASK->arch.iomap.bits); |
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| 127 | /* |
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| 128 | * It is safe to set the trailing eight bits because of the extra |
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| 129 | * convenience byte in TSS_IOMAP_SIZE. |
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| 130 | */ |
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| 1263 | jermar | 131 | bitmap_set_range(&iomap, ALIGN_UP(TASK->arch.iomap.bits, 8), 8); |
| 1256 | jermar | 132 | } |
| 133 | spinlock_unlock(&TASK->lock); |
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| 134 | |||
| 1263 | jermar | 135 | /* |
| 136 | * Second, adjust TSS segment limit. |
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| 137 | * Take the extra ending byte with all bits set into account. |
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| 138 | */ |
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| 1256 | jermar | 139 | gdtr_store(&cpugdtr); |
| 140 | gdt_p = (descriptor_t *) cpugdtr.base; |
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| 1263 | jermar | 141 | gdt_setlimit(&gdt_p[TSS_DES], TSS_BASIC_SIZE + BITS2BYTES(bits)); |
| 1256 | jermar | 142 | gdtr_load(&cpugdtr); |
| 143 | |||
| 144 | /* |
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| 145 | * Before we load new TSS limit, the current TSS descriptor |
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| 146 | * type must be changed to describe inactive TSS. |
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| 147 | */ |
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| 148 | gdt_p[TSS_DES].access = AR_PRESENT | AR_TSS | DPL_KERNEL; |
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| 149 | tr_load(selector(TSS_DES)); |
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| 150 | |||
| 151 | /* |
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| 152 | * Update the generation count so that faults caused by |
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| 153 | * early accesses can be serviced. |
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| 154 | */ |
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| 155 | CPU->arch.iomapver_copy = ver; |
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| 156 | } |