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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 <arch/ddi/ddi.h> |
31 | #include <proc/task.h> |
31 | #include <proc/task.h> |
32 | #include <arch/types.h> |
32 | #include <arch/types.h> |
33 | #include <typedefs.h> |
33 | #include <typedefs.h> |
34 | #include <adt/bitmap.h> |
34 | #include <adt/bitmap.h> |
35 | #include <mm/slab.h> |
35 | #include <mm/slab.h> |
36 | #include <arch/pm.h> |
36 | #include <arch/pm.h> |
37 | #include <errno.h> |
37 | #include <errno.h> |
38 | #include <arch/cpu.h> |
38 | #include <arch/cpu.h> |
39 | #include <cpu.h> |
39 | #include <cpu.h> |
40 | #include <arch.h> |
40 | #include <arch.h> |
41 | #include <align.h> |
41 | #include <align.h> |
42 | 42 | ||
43 | /** Enable I/O space range for task. |
43 | /** Enable I/O space range for task. |
44 | * |
44 | * |
45 | * Interrupts are disabled and task is locked. |
45 | * Interrupts are disabled and task is locked. |
46 | * |
46 | * |
47 | * @param task Task. |
47 | * @param task Task. |
48 | * @param ioaddr Startign I/O space address. |
48 | * @param ioaddr Startign I/O space address. |
49 | * @param size Size of the enabled I/O range. |
49 | * @param size Size of the enabled I/O range. |
50 | * |
50 | * |
51 | * @return 0 on success or an error code from errno.h. |
51 | * @return 0 on success or an error code from errno.h. |
52 | */ |
52 | */ |
53 | int ddi_iospace_enable_arch(task_t *task, __address ioaddr, size_t size) |
53 | int ddi_iospace_enable_arch(task_t *task, __address ioaddr, size_t size) |
54 | { |
54 | { |
55 | count_t bits; |
55 | count_t bits; |
56 | 56 | ||
57 | bits = ioaddr + size; |
57 | bits = ioaddr + size; |
58 | if (bits > IO_PORTS) |
58 | if (bits > IO_PORTS) |
59 | return ENOENT; |
59 | return ENOENT; |
60 | 60 | ||
61 | if (task->arch.iomap.bits < bits) { |
61 | if (task->arch.iomap.bits < bits) { |
62 | bitmap_t oldiomap; |
62 | bitmap_t oldiomap; |
63 | __u8 *newmap; |
63 | __u8 *newmap; |
64 | 64 | ||
65 | /* |
65 | /* |
66 | * The I/O permission bitmap is too small and needs to be grown. |
66 | * The I/O permission bitmap is too small and needs to be grown. |
67 | */ |
67 | */ |
68 | 68 | ||
69 | newmap = (__u8 *) malloc(BITS2BYTES(bits), FRAME_ATOMIC); |
69 | newmap = (__u8 *) malloc(BITS2BYTES(bits), FRAME_ATOMIC); |
70 | if (!newmap) |
70 | if (!newmap) |
71 | return ENOMEM; |
71 | return ENOMEM; |
72 | 72 | ||
73 | bitmap_initialize(&oldiomap, task->arch.iomap.map, task->arch.iomap.bits); |
73 | bitmap_initialize(&oldiomap, task->arch.iomap.map, task->arch.iomap.bits); |
74 | bitmap_initialize(&task->arch.iomap, newmap, bits); |
74 | bitmap_initialize(&task->arch.iomap, newmap, bits); |
75 | 75 | ||
76 | /* |
76 | /* |
77 | * Mark the new range inaccessible. |
77 | * Mark the new range inaccessible. |
78 | */ |
78 | */ |
79 | bitmap_set_range(&task->arch.iomap, oldiomap.bits, bits - oldiomap.bits); |
79 | bitmap_set_range(&task->arch.iomap, oldiomap.bits, bits - oldiomap.bits); |
80 | 80 | ||
81 | /* |
81 | /* |
82 | * In case there really existed smaller iomap, |
82 | * In case there really existed smaller iomap, |
83 | * copy its contents and deallocate it. |
83 | * copy its contents and deallocate it. |
84 | */ |
84 | */ |
85 | if (oldiomap.bits) { |
85 | if (oldiomap.bits) { |
86 | bitmap_copy(&task->arch.iomap, &oldiomap, oldiomap.bits); |
86 | bitmap_copy(&task->arch.iomap, &oldiomap, oldiomap.bits); |
87 | free(oldiomap.map); |
87 | free(oldiomap.map); |
88 | } |
88 | } |
89 | } |
89 | } |
90 | 90 | ||
91 | /* |
91 | /* |
92 | * Enable the range and we are done. |
92 | * Enable the range and we are done. |
93 | */ |
93 | */ |
94 | bitmap_clear_range(&task->arch.iomap, (index_t) ioaddr, (count_t) size); |
94 | bitmap_clear_range(&task->arch.iomap, (index_t) ioaddr, (count_t) size); |
95 | 95 | ||
96 | /* |
96 | /* |
97 | * Increment I/O Permission bitmap generation counter. |
97 | * Increment I/O Permission bitmap generation counter. |
98 | */ |
98 | */ |
99 | task->arch.iomapver++; |
99 | task->arch.iomapver++; |
100 | 100 | ||
101 | return 0; |
101 | return 0; |
102 | } |
102 | } |
103 | 103 | ||
104 | /** Enable/disable interrupts for syscall |
- | |
105 | * |
- | |
106 | * @param enable If non-zero, interrupts are enabled, otherwise disabled |
- | |
107 | * @param flags EFLAGS flags register |
- | |
108 | */ |
- | |
109 | __native ddi_int_control_arch(__native enable, __native *flags) |
- | |
110 | { |
- | |
111 | if (enable) |
- | |
112 | *flags |= EFLAGS_IF; |
- | |
113 | else |
- | |
114 | *flags &= ~EFLAGS_IF; |
- | |
115 | return 0; |
- | |
116 | } |
- | |
117 | - | ||
118 | /** Install I/O Permission bitmap. |
104 | /** Install I/O Permission bitmap. |
119 | * |
105 | * |
120 | * Current task's I/O permission bitmap, if any, is installed |
106 | * Current task's I/O permission bitmap, if any, is installed |
121 | * in the current CPU's TSS. |
107 | * in the current CPU's TSS. |
122 | * |
108 | * |
123 | * Interrupts must be disabled prior this call. |
109 | * Interrupts must be disabled prior this call. |
124 | */ |
110 | */ |
125 | void io_perm_bitmap_install(void) |
111 | void io_perm_bitmap_install(void) |
126 | { |
112 | { |
127 | count_t bits; |
113 | count_t bits; |
128 | ptr_16_32_t cpugdtr; |
114 | ptr_16_32_t cpugdtr; |
129 | descriptor_t *gdt_p; |
115 | descriptor_t *gdt_p; |
130 | count_t ver; |
116 | count_t ver; |
131 | 117 | ||
132 | /* First, copy the I/O Permission Bitmap. */ |
118 | /* First, copy the I/O Permission Bitmap. */ |
133 | spinlock_lock(&TASK->lock); |
119 | spinlock_lock(&TASK->lock); |
134 | ver = TASK->arch.iomapver; |
120 | ver = TASK->arch.iomapver; |
135 | if ((bits = TASK->arch.iomap.bits)) { |
121 | if ((bits = TASK->arch.iomap.bits)) { |
136 | bitmap_t iomap; |
122 | bitmap_t iomap; |
137 | 123 | ||
138 | ASSERT(TASK->arch.iomap.map); |
124 | ASSERT(TASK->arch.iomap.map); |
139 | bitmap_initialize(&iomap, CPU->arch.tss->iomap, TSS_IOMAP_SIZE * 8); |
125 | bitmap_initialize(&iomap, CPU->arch.tss->iomap, TSS_IOMAP_SIZE * 8); |
140 | bitmap_copy(&iomap, &TASK->arch.iomap, TASK->arch.iomap.bits); |
126 | bitmap_copy(&iomap, &TASK->arch.iomap, TASK->arch.iomap.bits); |
141 | /* |
127 | /* |
142 | * It is safe to set the trailing eight bits because of the extra |
128 | * It is safe to set the trailing eight bits because of the extra |
143 | * convenience byte in TSS_IOMAP_SIZE. |
129 | * convenience byte in TSS_IOMAP_SIZE. |
144 | */ |
130 | */ |
145 | bitmap_set_range(&iomap, ALIGN_UP(TASK->arch.iomap.bits, 8), 8); |
131 | bitmap_set_range(&iomap, ALIGN_UP(TASK->arch.iomap.bits, 8), 8); |
146 | } |
132 | } |
147 | spinlock_unlock(&TASK->lock); |
133 | spinlock_unlock(&TASK->lock); |
148 | 134 | ||
149 | /* |
135 | /* |
150 | * Second, adjust TSS segment limit. |
136 | * Second, adjust TSS segment limit. |
151 | * Take the extra ending byte with all bits set into account. |
137 | * Take the extra ending byte with all bits set into account. |
152 | */ |
138 | */ |
153 | gdtr_store(&cpugdtr); |
139 | gdtr_store(&cpugdtr); |
154 | gdt_p = (descriptor_t *) cpugdtr.base; |
140 | gdt_p = (descriptor_t *) cpugdtr.base; |
155 | gdt_setlimit(&gdt_p[TSS_DES], TSS_BASIC_SIZE + BITS2BYTES(bits)); |
141 | gdt_setlimit(&gdt_p[TSS_DES], TSS_BASIC_SIZE + BITS2BYTES(bits)); |
156 | gdtr_load(&cpugdtr); |
142 | gdtr_load(&cpugdtr); |
157 | 143 | ||
158 | /* |
144 | /* |
159 | * Before we load new TSS limit, the current TSS descriptor |
145 | * Before we load new TSS limit, the current TSS descriptor |
160 | * type must be changed to describe inactive TSS. |
146 | * type must be changed to describe inactive TSS. |
161 | */ |
147 | */ |
162 | gdt_p[TSS_DES].access = AR_PRESENT | AR_TSS | DPL_KERNEL; |
148 | gdt_p[TSS_DES].access = AR_PRESENT | AR_TSS | DPL_KERNEL; |
163 | tr_load(selector(TSS_DES)); |
149 | tr_load(selector(TSS_DES)); |
164 | 150 | ||
165 | /* |
151 | /* |
166 | * Update the generation count so that faults caused by |
152 | * Update the generation count so that faults caused by |
167 | * early accesses can be serviced. |
153 | * early accesses can be serviced. |
168 | */ |
154 | */ |
169 | CPU->arch.iomapver_copy = ver; |
155 | CPU->arch.iomapver_copy = ver; |
170 | } |
156 | } |
171 | 157 |