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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 <arch.h> |
|
38 | 40 | ||
39 | /** Enable I/O space range for task. |
41 | /** Enable I/O space range for task. |
40 | * |
42 | * |
41 | * Interrupts are disabled and task is locked. |
43 | * Interrupts are disabled and task is locked. |
42 | * |
44 | * |
43 | * @param task Task. |
45 | * @param task Task. |
44 | * @param ioaddr Startign I/O space address. |
46 | * @param ioaddr Startign I/O space address. |
45 | * @param size Size of the enabled I/O range. |
47 | * @param size Size of the enabled I/O range. |
46 | * |
48 | * |
47 | * @return 0 on success or an error code from errno.h. |
49 | * @return 0 on success or an error code from errno.h. |
48 | */ |
50 | */ |
49 | int ddi_iospace_enable_arch(task_t *task, __address ioaddr, size_t size) |
51 | int ddi_iospace_enable_arch(task_t *task, __address ioaddr, size_t size) |
50 | { |
52 | { |
51 | count_t bits; |
53 | count_t bits; |
52 | 54 | ||
53 | bits = ioaddr + size; |
55 | bits = ioaddr + size; |
54 | if (bits > IO_PORTS) |
56 | if (bits > IO_PORTS) |
55 | return ENOENT; |
57 | return ENOENT; |
56 | 58 | ||
57 | if (task->arch.iomap.bits < bits) { |
59 | if (task->arch.iomap.bits < bits) { |
58 | bitmap_t oldiomap; |
60 | bitmap_t oldiomap; |
59 | __u8 *newmap; |
61 | __u8 *newmap; |
60 | 62 | ||
61 | /* |
63 | /* |
62 | * The I/O permission bitmap is too small and needs to be grown. |
64 | * The I/O permission bitmap is too small and needs to be grown. |
63 | */ |
65 | */ |
64 | 66 | ||
65 | newmap = (__u8 *) malloc(BITS2BYTES(bits), FRAME_ATOMIC); |
67 | newmap = (__u8 *) malloc(BITS2BYTES(bits), FRAME_ATOMIC); |
66 | if (!newmap) |
68 | if (!newmap) |
67 | return ENOMEM; |
69 | return ENOMEM; |
68 | 70 | ||
69 | bitmap_initialize(&oldiomap, task->arch.iomap.map, task->arch.iomap.bits); |
71 | bitmap_initialize(&oldiomap, task->arch.iomap.map, task->arch.iomap.bits); |
70 | bitmap_initialize(&task->arch.iomap, newmap, bits); |
72 | bitmap_initialize(&task->arch.iomap, newmap, bits); |
71 | 73 | ||
72 | /* |
74 | /* |
73 | * Mark the new range inaccessible. |
75 | * Mark the new range inaccessible. |
74 | */ |
76 | */ |
75 | bitmap_set_range(&task->arch.iomap, oldiomap.bits, bits - oldiomap.bits); |
77 | bitmap_set_range(&task->arch.iomap, oldiomap.bits, bits - oldiomap.bits); |
76 | 78 | ||
77 | /* |
79 | /* |
78 | * In case there really existed smaller iomap, |
80 | * In case there really existed smaller iomap, |
79 | * copy its contents and deallocate it. |
81 | * copy its contents and deallocate it. |
80 | */ |
82 | */ |
81 | if (oldiomap.bits) { |
83 | if (oldiomap.bits) { |
82 | bitmap_copy(&task->arch.iomap, &oldiomap, task->arch.iomap.bits); |
84 | bitmap_copy(&task->arch.iomap, &oldiomap, task->arch.iomap.bits); |
83 | free(oldiomap.map); |
85 | free(oldiomap.map); |
84 | } |
86 | } |
85 | } |
87 | } |
86 | 88 | ||
87 | /* |
89 | /* |
88 | * Enable the range and we are done. |
90 | * Enable the range and we are done. |
89 | */ |
91 | */ |
90 | bitmap_clear_range(&task->arch.iomap, (index_t) ioaddr, (count_t) size); |
92 | bitmap_clear_range(&task->arch.iomap, (index_t) ioaddr, (count_t) size); |
91 | 93 | ||
- | 94 | /* |
|
- | 95 | * Increment I/O Permission bitmap generation counter. |
|
- | 96 | */ |
|
- | 97 | task->arch.iomapver++; |
|
- | 98 | ||
92 | return 0; |
99 | return 0; |
93 | } |
100 | } |
94 | 101 | ||
95 | /** Enable/disable interrupts form syscall |
102 | /** Enable/disable interrupts form syscall |
96 | * |
103 | * |
97 | * @param enable If non-zero, interrupts are enabled, otherwise disabled |
104 | * @param enable If non-zero, interrupts are enabled, otherwise disabled |
98 | * @param flags RFLAGS register |
105 | * @param flags RFLAGS register |
99 | */ |
106 | */ |
100 | __native ddi_int_control_arch(__native enable, __native *flags) |
107 | __native ddi_int_control_arch(__native enable, __native *flags) |
101 | { |
108 | { |
102 | if (enable) |
109 | if (enable) |
103 | *flags |= RFLAGS_IF; |
110 | *flags |= RFLAGS_IF; |
104 | else |
111 | else |
105 | *flags &= ~RFLAGS_IF; |
112 | *flags &= ~RFLAGS_IF; |
106 | return 0; |
113 | return 0; |
107 | } |
114 | } |
- | 115 | ||
- | 116 | /** Install I/O Permission bitmap. |
|
- | 117 | * |
|
- | 118 | * Current task's I/O permission bitmap, if any, is installed |
|
- | 119 | * in the current CPU's TSS. |
|
- | 120 | * |
|
- | 121 | * Interrupts must be disabled prior this call. |
|
- | 122 | */ |
|
- | 123 | void io_perm_bitmap_install(void) |
|
- | 124 | { |
|
- | 125 | count_t bits; |
|
- | 126 | ptr_16_64_t cpugdtr; |
|
- | 127 | descriptor_t *gdt_p; |
|
- | 128 | tss_descriptor_t *tss_desc; |
|
- | 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_tss_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 | tss_desc = (tss_descriptor_t *) &gdt_p[TSS_DES]; |
|
- | 159 | tss_desc->type = AR_TSS; |
|
- | 160 | tr_load(gdtselector(TSS_DES)); |
|
- | 161 | ||
- | 162 | /* |
|
- | 163 | * Update the generation count so that faults caused by |
|
- | 164 | * early accesses can be serviced. |
|
- | 165 | */ |
|
- | 166 | CPU->arch.iomapver_copy = ver; |
|
- | 167 | } |
|
108 | 168 |