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| 1 | /* |
1 | /* |
| 2 | * Copyright (C) 2006 Jakub Jermar |
2 | * Copyright (C) 2006 Jakub Jermar |
| 3 | * All rights reserved. |
3 | * All rights reserved. |
| 4 | * |
4 | * |
| 5 | * Redistribution and use in source and binary forms, with or without |
5 | * Redistribution and use in source and binary forms, with or without |
| 6 | * modification, are permitted provided that the following conditions |
6 | * modification, are permitted provided that the following conditions |
| 7 | * are met: |
7 | * are met: |
| 8 | * |
8 | * |
| 9 | * - Redistributions of source code must retain the above copyright |
9 | * - Redistributions of source code must retain the above copyright |
| 10 | * notice, this list of conditions and the following disclaimer. |
10 | * notice, this list of conditions and the following disclaimer. |
| 11 | * - Redistributions in binary form must reproduce the above copyright |
11 | * - Redistributions in binary form must reproduce the above copyright |
| 12 | * notice, this list of conditions and the following disclaimer in the |
12 | * notice, this list of conditions and the following disclaimer in the |
| 13 | * documentation and/or other materials provided with the distribution. |
13 | * documentation and/or other materials provided with the distribution. |
| 14 | * - The name of the author may not be used to endorse or promote products |
14 | * - The name of the author may not be used to endorse or promote products |
| 15 | * derived from this software without specific prior written permission. |
15 | * derived from this software without specific prior written permission. |
| 16 | * |
16 | * |
| 17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
| 18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| 19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
| 20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
| 21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| 22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| 26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 27 | */ |
27 | */ |
| 28 | 28 | ||
| 29 | #include <ddi/ddi.h> |
29 | #include <ddi/ddi.h> |
| - | 30 | #include <arch/ddi/ddi.h> |
|
| 30 | #include <proc/task.h> |
31 | #include <proc/task.h> |
| 31 | #include <arch/types.h> |
32 | #include <arch/types.h> |
| 32 | #include <typedefs.h> |
33 | #include <typedefs.h> |
| 33 | #include <adt/bitmap.h> |
34 | #include <adt/bitmap.h> |
| 34 | #include <mm/slab.h> |
35 | #include <mm/slab.h> |
| 35 | #include <arch/pm.h> |
36 | #include <arch/pm.h> |
| 36 | #include <errno.h> |
37 | #include <errno.h> |
| 37 | #include <arch/cpu.h> |
38 | #include <arch/cpu.h> |
| - | 39 | #include <cpu.h> |
|
| - | 40 | #include <arch.h> |
|
| 38 | 41 | ||
| 39 | /** Enable I/O space range for task. |
42 | /** Enable I/O space range for task. |
| 40 | * |
43 | * |
| 41 | * Interrupts are disabled and task is locked. |
44 | * Interrupts are disabled and task is locked. |
| 42 | * |
45 | * |
| 43 | * @param task Task. |
46 | * @param task Task. |
| 44 | * @param ioaddr Startign I/O space address. |
47 | * @param ioaddr Startign I/O space address. |
| 45 | * @param size Size of the enabled I/O range. |
48 | * @param size Size of the enabled I/O range. |
| 46 | * |
49 | * |
| 47 | * @return 0 on success or an error code from errno.h. |
50 | * @return 0 on success or an error code from errno.h. |
| 48 | */ |
51 | */ |
| 49 | int ddi_iospace_enable_arch(task_t *task, __address ioaddr, size_t size) |
52 | int ddi_iospace_enable_arch(task_t *task, __address ioaddr, size_t size) |
| 50 | { |
53 | { |
| 51 | count_t bits; |
54 | count_t bits; |
| 52 | 55 | ||
| 53 | bits = ioaddr + size; |
56 | bits = ioaddr + size; |
| 54 | if (bits > IO_PORTS) |
57 | if (bits > IO_PORTS) |
| 55 | return ENOENT; |
58 | return ENOENT; |
| 56 | 59 | ||
| 57 | if (task->arch.iomap.bits < bits) { |
60 | if (task->arch.iomap.bits < bits) { |
| 58 | bitmap_t oldiomap; |
61 | bitmap_t oldiomap; |
| 59 | __u8 *newmap; |
62 | __u8 *newmap; |
| 60 | 63 | ||
| 61 | /* |
64 | /* |
| 62 | * The I/O permission bitmap is too small and needs to be grown. |
65 | * The I/O permission bitmap is too small and needs to be grown. |
| 63 | */ |
66 | */ |
| 64 | 67 | ||
| 65 | newmap = (__u8 *) malloc(BITS2BYTES(bits), FRAME_ATOMIC); |
68 | newmap = (__u8 *) malloc(BITS2BYTES(bits), FRAME_ATOMIC); |
| 66 | if (!newmap) |
69 | if (!newmap) |
| 67 | return ENOMEM; |
70 | return ENOMEM; |
| 68 | 71 | ||
| 69 | bitmap_initialize(&oldiomap, task->arch.iomap.map, task->arch.iomap.bits); |
72 | bitmap_initialize(&oldiomap, task->arch.iomap.map, task->arch.iomap.bits); |
| 70 | bitmap_initialize(&task->arch.iomap, newmap, bits); |
73 | bitmap_initialize(&task->arch.iomap, newmap, bits); |
| 71 | 74 | ||
| 72 | /* |
75 | /* |
| 73 | * Mark the new range inaccessible. |
76 | * Mark the new range inaccessible. |
| 74 | */ |
77 | */ |
| 75 | bitmap_set_range(&task->arch.iomap, oldiomap.bits, bits - oldiomap.bits); |
78 | bitmap_set_range(&task->arch.iomap, oldiomap.bits, bits - oldiomap.bits); |
| 76 | 79 | ||
| 77 | /* |
80 | /* |
| 78 | * In case there really existed smaller iomap, |
81 | * In case there really existed smaller iomap, |
| 79 | * copy its contents and deallocate it. |
82 | * copy its contents and deallocate it. |
| 80 | */ |
83 | */ |
| 81 | if (oldiomap.bits) { |
84 | if (oldiomap.bits) { |
| 82 | bitmap_copy(&task->arch.iomap, &oldiomap, task->arch.iomap.bits); |
85 | bitmap_copy(&task->arch.iomap, &oldiomap, task->arch.iomap.bits); |
| 83 | free(oldiomap.map); |
86 | free(oldiomap.map); |
| 84 | } |
87 | } |
| 85 | } |
88 | } |
| 86 | 89 | ||
| 87 | /* |
90 | /* |
| 88 | * Enable the range and we are done. |
91 | * Enable the range and we are done. |
| 89 | */ |
92 | */ |
| 90 | bitmap_clear_range(&task->arch.iomap, (index_t) ioaddr, (count_t) size); |
93 | bitmap_clear_range(&task->arch.iomap, (index_t) ioaddr, (count_t) size); |
| 91 | 94 | ||
| - | 95 | /* |
|
| - | 96 | * Increment I/O Permission bitmap generation counter. |
|
| - | 97 | */ |
|
| - | 98 | task->arch.iomapver++; |
|
| - | 99 | ||
| 92 | return 0; |
100 | return 0; |
| 93 | } |
101 | } |
| 94 | 102 | ||
| 95 | /** Enable/disable interrupts for syscall |
103 | /** Enable/disable interrupts for syscall |
| 96 | * |
104 | * |
| 97 | * @param enable If non-zero, interrupts are enabled, otherwise disabled |
105 | * @param enable If non-zero, interrupts are enabled, otherwise disabled |
| 98 | * @param flags EFLAGS flags register |
106 | * @param flags EFLAGS flags register |
| 99 | */ |
107 | */ |
| 100 | __native ddi_int_control_arch(__native enable, __native *flags) |
108 | __native ddi_int_control_arch(__native enable, __native *flags) |
| 101 | { |
109 | { |
| 102 | if (enable) |
110 | if (enable) |
| 103 | *flags |= EFLAGS_IF; |
111 | *flags |= EFLAGS_IF; |
| 104 | else |
112 | else |
| 105 | *flags &= ~EFLAGS_IF; |
113 | *flags &= ~EFLAGS_IF; |
| 106 | return 0; |
114 | return 0; |
| 107 | } |
115 | } |
| - | 116 | ||
| - | 117 | /** Install I/O Permission bitmap. |
|
| - | 118 | * |
|
| - | 119 | * Current task's I/O permission bitmap, if any, is installed |
|
| - | 120 | * in the current CPU's TSS. |
|
| - | 121 | * |
|
| - | 122 | * Interrupts must be disabled prior this call. |
|
| - | 123 | */ |
|
| - | 124 | void io_perm_bitmap_install(void) |
|
| - | 125 | { |
|
| - | 126 | count_t bits; |
|
| - | 127 | ptr_16_32_t cpugdtr; |
|
| - | 128 | descriptor_t *gdt_p; |
|
| - | 129 | count_t ver; |
|
| - | 130 | ||
| - | 131 | /* First, copy the I/O Permission Bitmap. */ |
|
| - | 132 | spinlock_lock(&TASK->lock); |
|
| - | 133 | ver = TASK->arch.iomapver; |
|
| - | 134 | if ((bits = TASK->arch.iomap.bits)) { |
|
| - | 135 | bitmap_t iomap; |
|
| - | 136 | ||
| - | 137 | ASSERT(TASK->arch.iomap.map); |
|
| - | 138 | bitmap_initialize(&iomap, CPU->arch.tss->iomap, TSS_IOMAP_SIZE * 8); |
|
| - | 139 | bitmap_copy(&iomap, &TASK->arch.iomap, TASK->arch.iomap.bits); |
|
| - | 140 | /* |
|
| - | 141 | * It is safe to set the trailing eight bits because of the extra |
|
| - | 142 | * convenience byte in TSS_IOMAP_SIZE. |
|
| - | 143 | */ |
|
| - | 144 | bitmap_set_range(&iomap, TASK->arch.iomap.bits, 8); |
|
| - | 145 | } |
|
| - | 146 | spinlock_unlock(&TASK->lock); |
|
| - | 147 | ||
| - | 148 | /* Second, adjust TSS segment limit. */ |
|
| - | 149 | gdtr_store(&cpugdtr); |
|
| - | 150 | gdt_p = (descriptor_t *) cpugdtr.base; |
|
| - | 151 | gdt_setlimit(&gdt_p[TSS_DES], TSS_BASIC_SIZE + BITS2BYTES(bits) - 1); |
|
| - | 152 | gdtr_load(&cpugdtr); |
|
| - | 153 | ||
| - | 154 | /* |
|
| - | 155 | * Before we load new TSS limit, the current TSS descriptor |
|
| - | 156 | * type must be changed to describe inactive TSS. |
|
| - | 157 | */ |
|
| - | 158 | gdt_p[TSS_DES].access = AR_PRESENT | AR_TSS | DPL_KERNEL; |
|
| - | 159 | tr_load(selector(TSS_DES)); |
|
| - | 160 | ||
| - | 161 | /* |
|
| - | 162 | * Update the generation count so that faults caused by |
|
| - | 163 | * early accesses can be serviced. |
|
| - | 164 | */ |
|
| - | 165 | CPU->arch.iomapver_copy = ver; |
|
| - | 166 | } |
|
| 108 | 167 | ||