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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 <arch.h> |
39 | #include <arch.h> |
- | 40 | #include <align.h> |
|
40 | 41 | ||
41 | /** Enable I/O space range for task. |
42 | /** Enable I/O space range for task. |
42 | * |
43 | * |
43 | * Interrupts are disabled and task is locked. |
44 | * Interrupts are disabled and task is locked. |
44 | * |
45 | * |
45 | * @param task Task. |
46 | * @param task Task. |
46 | * @param ioaddr Startign I/O space address. |
47 | * @param ioaddr Startign I/O space address. |
47 | * @param size Size of the enabled I/O range. |
48 | * @param size Size of the enabled I/O range. |
48 | * |
49 | * |
49 | * @return 0 on success or an error code from errno.h. |
50 | * @return 0 on success or an error code from errno.h. |
50 | */ |
51 | */ |
51 | 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) |
52 | { |
53 | { |
53 | count_t bits; |
54 | count_t bits; |
54 | 55 | ||
55 | bits = ioaddr + size; |
56 | bits = ioaddr + size; |
56 | if (bits > IO_PORTS) |
57 | if (bits > IO_PORTS) |
57 | return ENOENT; |
58 | return ENOENT; |
58 | 59 | ||
59 | if (task->arch.iomap.bits < bits) { |
60 | if (task->arch.iomap.bits < bits) { |
60 | bitmap_t oldiomap; |
61 | bitmap_t oldiomap; |
61 | __u8 *newmap; |
62 | __u8 *newmap; |
62 | 63 | ||
63 | /* |
64 | /* |
64 | * 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. |
65 | */ |
66 | */ |
66 | 67 | ||
67 | newmap = (__u8 *) malloc(BITS2BYTES(bits), FRAME_ATOMIC); |
68 | newmap = (__u8 *) malloc(BITS2BYTES(bits), FRAME_ATOMIC); |
68 | if (!newmap) |
69 | if (!newmap) |
69 | return ENOMEM; |
70 | return ENOMEM; |
70 | 71 | ||
71 | bitmap_initialize(&oldiomap, task->arch.iomap.map, task->arch.iomap.bits); |
72 | bitmap_initialize(&oldiomap, task->arch.iomap.map, task->arch.iomap.bits); |
72 | bitmap_initialize(&task->arch.iomap, newmap, bits); |
73 | bitmap_initialize(&task->arch.iomap, newmap, bits); |
73 | 74 | ||
74 | /* |
75 | /* |
75 | * Mark the new range inaccessible. |
76 | * Mark the new range inaccessible. |
76 | */ |
77 | */ |
77 | bitmap_set_range(&task->arch.iomap, oldiomap.bits, bits - oldiomap.bits); |
78 | bitmap_set_range(&task->arch.iomap, oldiomap.bits, bits - oldiomap.bits); |
78 | 79 | ||
79 | /* |
80 | /* |
80 | * In case there really existed smaller iomap, |
81 | * In case there really existed smaller iomap, |
81 | * copy its contents and deallocate it. |
82 | * copy its contents and deallocate it. |
82 | */ |
83 | */ |
83 | if (oldiomap.bits) { |
84 | if (oldiomap.bits) { |
84 | bitmap_copy(&task->arch.iomap, &oldiomap, oldiomap.bits); |
85 | bitmap_copy(&task->arch.iomap, &oldiomap, oldiomap.bits); |
85 | free(oldiomap.map); |
86 | free(oldiomap.map); |
86 | } |
87 | } |
87 | } |
88 | } |
88 | 89 | ||
89 | /* |
90 | /* |
90 | * Enable the range and we are done. |
91 | * Enable the range and we are done. |
91 | */ |
92 | */ |
92 | 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); |
93 | 94 | ||
94 | /* |
95 | /* |
95 | * Increment I/O Permission bitmap generation counter. |
96 | * Increment I/O Permission bitmap generation counter. |
96 | */ |
97 | */ |
97 | task->arch.iomapver++; |
98 | task->arch.iomapver++; |
98 | 99 | ||
99 | return 0; |
100 | return 0; |
100 | } |
101 | } |
101 | 102 | ||
102 | /** Enable/disable interrupts form syscall |
103 | /** Enable/disable interrupts form syscall |
103 | * |
104 | * |
104 | * @param enable If non-zero, interrupts are enabled, otherwise disabled |
105 | * @param enable If non-zero, interrupts are enabled, otherwise disabled |
105 | * @param flags RFLAGS register |
106 | * @param flags RFLAGS register |
106 | */ |
107 | */ |
107 | __native ddi_int_control_arch(__native enable, __native *flags) |
108 | __native ddi_int_control_arch(__native enable, __native *flags) |
108 | { |
109 | { |
109 | if (enable) |
110 | if (enable) |
110 | *flags |= RFLAGS_IF; |
111 | *flags |= RFLAGS_IF; |
111 | else |
112 | else |
112 | *flags &= ~RFLAGS_IF; |
113 | *flags &= ~RFLAGS_IF; |
113 | return 0; |
114 | return 0; |
114 | } |
115 | } |
115 | 116 | ||
116 | /** Install I/O Permission bitmap. |
117 | /** Install I/O Permission bitmap. |
117 | * |
118 | * |
118 | * Current task's I/O permission bitmap, if any, is installed |
119 | * Current task's I/O permission bitmap, if any, is installed |
119 | * in the current CPU's TSS. |
120 | * in the current CPU's TSS. |
120 | * |
121 | * |
121 | * Interrupts must be disabled prior this call. |
122 | * Interrupts must be disabled prior this call. |
122 | */ |
123 | */ |
123 | void io_perm_bitmap_install(void) |
124 | void io_perm_bitmap_install(void) |
124 | { |
125 | { |
125 | count_t bits; |
126 | count_t bits; |
126 | ptr_16_64_t cpugdtr; |
127 | ptr_16_64_t cpugdtr; |
127 | descriptor_t *gdt_p; |
128 | descriptor_t *gdt_p; |
128 | tss_descriptor_t *tss_desc; |
129 | tss_descriptor_t *tss_desc; |
129 | count_t ver; |
130 | count_t ver; |
130 | 131 | ||
131 | /* First, copy the I/O Permission Bitmap. */ |
132 | /* First, copy the I/O Permission Bitmap. */ |
132 | spinlock_lock(&TASK->lock); |
133 | spinlock_lock(&TASK->lock); |
133 | ver = TASK->arch.iomapver; |
134 | ver = TASK->arch.iomapver; |
134 | if ((bits = TASK->arch.iomap.bits)) { |
135 | if ((bits = TASK->arch.iomap.bits)) { |
135 | bitmap_t iomap; |
136 | bitmap_t iomap; |
136 | 137 | ||
137 | ASSERT(TASK->arch.iomap.map); |
138 | ASSERT(TASK->arch.iomap.map); |
138 | bitmap_initialize(&iomap, CPU->arch.tss->iomap, TSS_IOMAP_SIZE * 8); |
139 | bitmap_initialize(&iomap, CPU->arch.tss->iomap, TSS_IOMAP_SIZE * 8); |
139 | bitmap_copy(&iomap, &TASK->arch.iomap, TASK->arch.iomap.bits); |
140 | bitmap_copy(&iomap, &TASK->arch.iomap, TASK->arch.iomap.bits); |
140 | /* |
141 | /* |
141 | * It is safe to set the trailing eight bits because of the extra |
142 | * It is safe to set the trailing eight bits because of the extra |
142 | * convenience byte in TSS_IOMAP_SIZE. |
143 | * convenience byte in TSS_IOMAP_SIZE. |
143 | */ |
144 | */ |
144 | bitmap_set_range(&iomap, TASK->arch.iomap.bits, 8); |
145 | bitmap_set_range(&iomap, ALIGN_UP(TASK->arch.iomap.bits, 8), 8); |
145 | } |
146 | } |
146 | spinlock_unlock(&TASK->lock); |
147 | spinlock_unlock(&TASK->lock); |
147 | 148 | ||
- | 149 | /* |
|
148 | /* Second, adjust TSS segment limit. */ |
150 | * Second, adjust TSS segment limit. |
- | 151 | * Take the extra ending byte will all bits set into account. |
|
- | 152 | */ |
|
149 | gdtr_store(&cpugdtr); |
153 | gdtr_store(&cpugdtr); |
150 | gdt_p = (descriptor_t *) cpugdtr.base; |
154 | gdt_p = (descriptor_t *) cpugdtr.base; |
151 | gdt_tss_setlimit(&gdt_p[TSS_DES], TSS_BASIC_SIZE + BITS2BYTES(bits) - 1); |
155 | gdt_tss_setlimit(&gdt_p[TSS_DES], TSS_BASIC_SIZE + BITS2BYTES(bits)); |
152 | gdtr_load(&cpugdtr); |
156 | gdtr_load(&cpugdtr); |
153 | 157 | ||
154 | /* |
158 | /* |
155 | * Before we load new TSS limit, the current TSS descriptor |
159 | * Before we load new TSS limit, the current TSS descriptor |
156 | * type must be changed to describe inactive TSS. |
160 | * type must be changed to describe inactive TSS. |
157 | */ |
161 | */ |
158 | tss_desc = (tss_descriptor_t *) &gdt_p[TSS_DES]; |
162 | tss_desc = (tss_descriptor_t *) &gdt_p[TSS_DES]; |
159 | tss_desc->type = AR_TSS; |
163 | tss_desc->type = AR_TSS; |
160 | tr_load(gdtselector(TSS_DES)); |
164 | tr_load(gdtselector(TSS_DES)); |
161 | 165 | ||
162 | /* |
166 | /* |
163 | * Update the generation count so that faults caused by |
167 | * Update the generation count so that faults caused by |
164 | * early accesses can be serviced. |
168 | * early accesses can be serviced. |
165 | */ |
169 | */ |
166 | CPU->arch.iomapver_copy = ver; |
170 | CPU->arch.iomapver_copy = ver; |
167 | } |
171 | } |
168 | 172 |