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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 | /** @addtogroup ia32ddi ia32 |
|
- | 30 | * @ingroup ddi |
|
- | 31 | * @{ |
|
- | 32 | */ |
|
- | 33 | /** @file |
|
- | 34 | */ |
|
- | 35 | ||
29 | #include <ddi/ddi.h> |
36 | #include <ddi/ddi.h> |
30 | #include <arch/ddi/ddi.h> |
37 | #include <arch/ddi/ddi.h> |
31 | #include <proc/task.h> |
38 | #include <proc/task.h> |
32 | #include <arch/types.h> |
39 | #include <arch/types.h> |
33 | #include <typedefs.h> |
40 | #include <typedefs.h> |
34 | #include <adt/bitmap.h> |
41 | #include <adt/bitmap.h> |
35 | #include <mm/slab.h> |
42 | #include <mm/slab.h> |
36 | #include <arch/pm.h> |
43 | #include <arch/pm.h> |
37 | #include <errno.h> |
44 | #include <errno.h> |
38 | #include <arch/cpu.h> |
45 | #include <arch/cpu.h> |
39 | #include <cpu.h> |
46 | #include <cpu.h> |
40 | #include <arch.h> |
47 | #include <arch.h> |
41 | #include <align.h> |
48 | #include <align.h> |
42 | 49 | ||
43 | /** Enable I/O space range for task. |
50 | /** Enable I/O space range for task. |
44 | * |
51 | * |
45 | * Interrupts are disabled and task is locked. |
52 | * Interrupts are disabled and task is locked. |
46 | * |
53 | * |
47 | * @param task Task. |
54 | * @param task Task. |
48 | * @param ioaddr Startign I/O space address. |
55 | * @param ioaddr Startign I/O space address. |
49 | * @param size Size of the enabled I/O range. |
56 | * @param size Size of the enabled I/O range. |
50 | * |
57 | * |
51 | * @return 0 on success or an error code from errno.h. |
58 | * @return 0 on success or an error code from errno.h. |
52 | */ |
59 | */ |
53 | int ddi_iospace_enable_arch(task_t *task, __address ioaddr, size_t size) |
60 | int ddi_iospace_enable_arch(task_t *task, __address ioaddr, size_t size) |
54 | { |
61 | { |
55 | count_t bits; |
62 | count_t bits; |
56 | 63 | ||
57 | bits = ioaddr + size; |
64 | bits = ioaddr + size; |
58 | if (bits > IO_PORTS) |
65 | if (bits > IO_PORTS) |
59 | return ENOENT; |
66 | return ENOENT; |
60 | 67 | ||
61 | if (task->arch.iomap.bits < bits) { |
68 | if (task->arch.iomap.bits < bits) { |
62 | bitmap_t oldiomap; |
69 | bitmap_t oldiomap; |
63 | __u8 *newmap; |
70 | __u8 *newmap; |
64 | 71 | ||
65 | /* |
72 | /* |
66 | * The I/O permission bitmap is too small and needs to be grown. |
73 | * The I/O permission bitmap is too small and needs to be grown. |
67 | */ |
74 | */ |
68 | 75 | ||
69 | newmap = (__u8 *) malloc(BITS2BYTES(bits), FRAME_ATOMIC); |
76 | newmap = (__u8 *) malloc(BITS2BYTES(bits), FRAME_ATOMIC); |
70 | if (!newmap) |
77 | if (!newmap) |
71 | return ENOMEM; |
78 | return ENOMEM; |
72 | 79 | ||
73 | bitmap_initialize(&oldiomap, task->arch.iomap.map, task->arch.iomap.bits); |
80 | bitmap_initialize(&oldiomap, task->arch.iomap.map, task->arch.iomap.bits); |
74 | bitmap_initialize(&task->arch.iomap, newmap, bits); |
81 | bitmap_initialize(&task->arch.iomap, newmap, bits); |
75 | 82 | ||
76 | /* |
83 | /* |
77 | * Mark the new range inaccessible. |
84 | * Mark the new range inaccessible. |
78 | */ |
85 | */ |
79 | bitmap_set_range(&task->arch.iomap, oldiomap.bits, bits - oldiomap.bits); |
86 | bitmap_set_range(&task->arch.iomap, oldiomap.bits, bits - oldiomap.bits); |
80 | 87 | ||
81 | /* |
88 | /* |
82 | * In case there really existed smaller iomap, |
89 | * In case there really existed smaller iomap, |
83 | * copy its contents and deallocate it. |
90 | * copy its contents and deallocate it. |
84 | */ |
91 | */ |
85 | if (oldiomap.bits) { |
92 | if (oldiomap.bits) { |
86 | bitmap_copy(&task->arch.iomap, &oldiomap, oldiomap.bits); |
93 | bitmap_copy(&task->arch.iomap, &oldiomap, oldiomap.bits); |
87 | free(oldiomap.map); |
94 | free(oldiomap.map); |
88 | } |
95 | } |
89 | } |
96 | } |
90 | 97 | ||
91 | /* |
98 | /* |
92 | * Enable the range and we are done. |
99 | * Enable the range and we are done. |
93 | */ |
100 | */ |
94 | bitmap_clear_range(&task->arch.iomap, (index_t) ioaddr, (count_t) size); |
101 | bitmap_clear_range(&task->arch.iomap, (index_t) ioaddr, (count_t) size); |
95 | 102 | ||
96 | /* |
103 | /* |
97 | * Increment I/O Permission bitmap generation counter. |
104 | * Increment I/O Permission bitmap generation counter. |
98 | */ |
105 | */ |
99 | task->arch.iomapver++; |
106 | task->arch.iomapver++; |
100 | 107 | ||
101 | return 0; |
108 | return 0; |
102 | } |
109 | } |
103 | 110 | ||
104 | /** Install I/O Permission bitmap. |
111 | /** Install I/O Permission bitmap. |
105 | * |
112 | * |
106 | * Current task's I/O permission bitmap, if any, is installed |
113 | * Current task's I/O permission bitmap, if any, is installed |
107 | * in the current CPU's TSS. |
114 | * in the current CPU's TSS. |
108 | * |
115 | * |
109 | * Interrupts must be disabled prior this call. |
116 | * Interrupts must be disabled prior this call. |
110 | */ |
117 | */ |
111 | void io_perm_bitmap_install(void) |
118 | void io_perm_bitmap_install(void) |
112 | { |
119 | { |
113 | count_t bits; |
120 | count_t bits; |
114 | ptr_16_32_t cpugdtr; |
121 | ptr_16_32_t cpugdtr; |
115 | descriptor_t *gdt_p; |
122 | descriptor_t *gdt_p; |
116 | count_t ver; |
123 | count_t ver; |
117 | 124 | ||
118 | /* First, copy the I/O Permission Bitmap. */ |
125 | /* First, copy the I/O Permission Bitmap. */ |
119 | spinlock_lock(&TASK->lock); |
126 | spinlock_lock(&TASK->lock); |
120 | ver = TASK->arch.iomapver; |
127 | ver = TASK->arch.iomapver; |
121 | if ((bits = TASK->arch.iomap.bits)) { |
128 | if ((bits = TASK->arch.iomap.bits)) { |
122 | bitmap_t iomap; |
129 | bitmap_t iomap; |
123 | 130 | ||
124 | ASSERT(TASK->arch.iomap.map); |
131 | ASSERT(TASK->arch.iomap.map); |
125 | bitmap_initialize(&iomap, CPU->arch.tss->iomap, TSS_IOMAP_SIZE * 8); |
132 | bitmap_initialize(&iomap, CPU->arch.tss->iomap, TSS_IOMAP_SIZE * 8); |
126 | bitmap_copy(&iomap, &TASK->arch.iomap, TASK->arch.iomap.bits); |
133 | bitmap_copy(&iomap, &TASK->arch.iomap, TASK->arch.iomap.bits); |
127 | /* |
134 | /* |
128 | * It is safe to set the trailing eight bits because of the extra |
135 | * It is safe to set the trailing eight bits because of the extra |
129 | * convenience byte in TSS_IOMAP_SIZE. |
136 | * convenience byte in TSS_IOMAP_SIZE. |
130 | */ |
137 | */ |
131 | bitmap_set_range(&iomap, ALIGN_UP(TASK->arch.iomap.bits, 8), 8); |
138 | bitmap_set_range(&iomap, ALIGN_UP(TASK->arch.iomap.bits, 8), 8); |
132 | } |
139 | } |
133 | spinlock_unlock(&TASK->lock); |
140 | spinlock_unlock(&TASK->lock); |
134 | 141 | ||
135 | /* |
142 | /* |
136 | * Second, adjust TSS segment limit. |
143 | * Second, adjust TSS segment limit. |
137 | * Take the extra ending byte with all bits set into account. |
144 | * Take the extra ending byte with all bits set into account. |
138 | */ |
145 | */ |
139 | gdtr_store(&cpugdtr); |
146 | gdtr_store(&cpugdtr); |
140 | gdt_p = (descriptor_t *) cpugdtr.base; |
147 | gdt_p = (descriptor_t *) cpugdtr.base; |
141 | gdt_setlimit(&gdt_p[TSS_DES], TSS_BASIC_SIZE + BITS2BYTES(bits)); |
148 | gdt_setlimit(&gdt_p[TSS_DES], TSS_BASIC_SIZE + BITS2BYTES(bits)); |
142 | gdtr_load(&cpugdtr); |
149 | gdtr_load(&cpugdtr); |
143 | 150 | ||
144 | /* |
151 | /* |
145 | * Before we load new TSS limit, the current TSS descriptor |
152 | * Before we load new TSS limit, the current TSS descriptor |
146 | * type must be changed to describe inactive TSS. |
153 | * type must be changed to describe inactive TSS. |
147 | */ |
154 | */ |
148 | gdt_p[TSS_DES].access = AR_PRESENT | AR_TSS | DPL_KERNEL; |
155 | gdt_p[TSS_DES].access = AR_PRESENT | AR_TSS | DPL_KERNEL; |
149 | tr_load(selector(TSS_DES)); |
156 | tr_load(selector(TSS_DES)); |
150 | 157 | ||
151 | /* |
158 | /* |
152 | * Update the generation count so that faults caused by |
159 | * Update the generation count so that faults caused by |
153 | * early accesses can be serviced. |
160 | * early accesses can be serviced. |
154 | */ |
161 | */ |
155 | CPU->arch.iomapver_copy = ver; |
162 | CPU->arch.iomapver_copy = ver; |
156 | } |
163 | } |
- | 164 | ||
- | 165 | /** @} |
|
- | 166 | */ |
|
- | 167 | ||
157 | 168 |