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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 | ||
- | 29 | /** |
|
- | 30 | * @file ddi.c |
|
- | 31 | * @brief Device Driver Interface functions. |
|
- | 32 | * |
|
- | 33 | * This file contains functions that comprise the Device Driver Interface. |
|
- | 34 | * These are the functions for mapping physical memory and enabling I/O |
|
- | 35 | * space to tasks. |
|
- | 36 | */ |
|
28 | 37 | ||
29 | #include <ddi/ddi.h> |
38 | #include <ddi/ddi.h> |
30 | #include <ddi/ddi_arg.h> |
39 | #include <ddi/ddi_arg.h> |
31 | #include <proc/task.h> |
40 | #include <proc/task.h> |
32 | #include <security/cap.h> |
41 | #include <security/cap.h> |
33 | #include <mm/frame.h> |
42 | #include <mm/frame.h> |
34 | #include <mm/page.h> |
43 | #include <mm/page.h> |
35 | #include <mm/as.h> |
44 | #include <mm/as.h> |
36 | #include <synch/spinlock.h> |
45 | #include <synch/spinlock.h> |
37 | #include <arch.h> |
46 | #include <arch.h> |
38 | #include <align.h> |
47 | #include <align.h> |
39 | #include <errno.h> |
48 | #include <errno.h> |
40 | 49 | ||
41 | /** Map piece of physical memory into virtual address space of specified task. |
50 | /** Map piece of physical memory into virtual address space of specified task. |
42 | * |
51 | * |
43 | * @param id Task ID of the destination task. |
52 | * @param id Task ID of the destination task. |
44 | * @param pf Physical frame address of the starting frame. |
53 | * @param pf Physical frame address of the starting frame. |
45 | * @param vp Virtual page address of the starting page. |
54 | * @param vp Virtual page address of the starting page. |
46 | * @param pages Number of pages to map. |
55 | * @param pages Number of pages to map. |
47 | * @param writable If true, the mapping will be created writable. |
56 | * @param writable If true, the mapping will be created writable. |
48 | * |
57 | * |
49 | * @return 0 on success, EPERM if the caller lacks capabilities to use this syscall, |
58 | * @return 0 on success, EPERM if the caller lacks capabilities to use this syscall, |
50 | * ENOENT if there is no task matching the specified ID and ENOMEM if |
59 | * ENOENT if there is no task matching the specified ID and ENOMEM if |
51 | * there was a problem in creating address space area. |
60 | * there was a problem in creating address space area. |
52 | */ |
61 | */ |
53 | static int ddi_physmem_map(task_id_t id, __address pf, __address vp, count_t pages, bool writable) |
62 | static int ddi_physmem_map(task_id_t id, __address pf, __address vp, count_t pages, bool writable) |
54 | { |
63 | { |
55 | ipl_t ipl; |
64 | ipl_t ipl; |
56 | cap_t caps; |
65 | cap_t caps; |
57 | task_t *t; |
66 | task_t *t; |
58 | int flags; |
67 | int flags; |
59 | count_t i; |
68 | count_t i; |
60 | 69 | ||
61 | /* |
70 | /* |
62 | * Make sure the caller is authorised to make this syscall. |
71 | * Make sure the caller is authorised to make this syscall. |
63 | */ |
72 | */ |
64 | caps = cap_get(TASK); |
73 | caps = cap_get(TASK); |
65 | if (!(caps & CAP_MEM_MANAGER)) |
74 | if (!(caps & CAP_MEM_MANAGER)) |
66 | return EPERM; |
75 | return EPERM; |
67 | 76 | ||
68 | ipl = interrupts_disable(); |
77 | ipl = interrupts_disable(); |
69 | spinlock_lock(&tasks_lock); |
78 | spinlock_lock(&tasks_lock); |
70 | 79 | ||
71 | t = task_find_by_id(id); |
80 | t = task_find_by_id(id); |
72 | 81 | ||
73 | if (!t) { |
82 | if (!t) { |
74 | /* |
83 | /* |
75 | * There is no task with the specified ID. |
84 | * There is no task with the specified ID. |
76 | */ |
85 | */ |
77 | spinlock_unlock(&tasks_lock); |
86 | spinlock_unlock(&tasks_lock); |
78 | interrupts_restore(ipl); |
87 | interrupts_restore(ipl); |
79 | return ENOENT; |
88 | return ENOENT; |
80 | } |
89 | } |
81 | 90 | ||
82 | /* |
91 | /* |
83 | * TODO: We are currently lacking support for task destroying. |
92 | * TODO: We are currently lacking support for task destroying. |
84 | * Once it is added to the kernel, we must take care to |
93 | * Once it is added to the kernel, we must take care to |
85 | * synchronize in a way that prevents race conditions here. |
94 | * synchronize in a way that prevents race conditions here. |
86 | */ |
95 | */ |
87 | 96 | ||
88 | /* Lock the task and release the lock protecting tasks_btree. */ |
97 | /* Lock the task and release the lock protecting tasks_btree. */ |
89 | spinlock_lock(&t->lock); |
98 | spinlock_lock(&t->lock); |
90 | spinlock_unlock(&tasks_lock); |
99 | spinlock_unlock(&tasks_lock); |
91 | 100 | ||
92 | flags = AS_AREA_DEVICE | AS_AREA_READ; |
101 | flags = AS_AREA_DEVICE | AS_AREA_READ; |
93 | if (writable) |
102 | if (writable) |
94 | flags |= AS_AREA_WRITE; |
103 | flags |= AS_AREA_WRITE; |
95 | if (!as_area_create(t->as, flags, pages * PAGE_SIZE, vp, AS_AREA_ATTR_NONE)) { |
104 | if (!as_area_create(t->as, flags, pages * PAGE_SIZE, vp, AS_AREA_ATTR_NONE)) { |
96 | /* |
105 | /* |
97 | * The address space area could not have been created. |
106 | * The address space area could not have been created. |
98 | * We report it using ENOMEM. |
107 | * We report it using ENOMEM. |
99 | */ |
108 | */ |
100 | spinlock_unlock(&t->lock); |
109 | spinlock_unlock(&t->lock); |
101 | interrupts_restore(ipl); |
110 | interrupts_restore(ipl); |
102 | return ENOMEM; |
111 | return ENOMEM; |
103 | } |
112 | } |
104 | 113 | ||
105 | /* Initialize page tables. */ |
114 | /* Initialize page tables. */ |
106 | for (i = 0; i < pages; i++) |
115 | for (i = 0; i < pages; i++) |
107 | as_set_mapping(t->as, vp + i * PAGE_SIZE, pf + i * FRAME_SIZE); |
116 | as_set_mapping(t->as, vp + i * PAGE_SIZE, pf + i * FRAME_SIZE); |
108 | 117 | ||
109 | spinlock_unlock(&t->lock); |
118 | spinlock_unlock(&t->lock); |
110 | interrupts_restore(ipl); |
119 | interrupts_restore(ipl); |
111 | return 0; |
120 | return 0; |
112 | } |
121 | } |
113 | 122 | ||
114 | /** Enable range of I/O space for task. |
123 | /** Enable range of I/O space for task. |
115 | * |
124 | * |
116 | * @param id Task ID of the destination task. |
125 | * @param id Task ID of the destination task. |
117 | * @param ioaddr Starting I/O address. |
126 | * @param ioaddr Starting I/O address. |
118 | * @param size Size of the enabled I/O space.. |
127 | * @param size Size of the enabled I/O space.. |
119 | * |
128 | * |
120 | * @return 0 on success, EPERM if the caller lacks capabilities to use this syscall, |
129 | * @return 0 on success, EPERM if the caller lacks capabilities to use this syscall, |
121 | * ENOENT if there is no task matching the specified ID. |
130 | * ENOENT if there is no task matching the specified ID. |
122 | */ |
131 | */ |
123 | static int ddi_iospace_enable(task_id_t id, __address ioaddr, size_t size) |
132 | static int ddi_iospace_enable(task_id_t id, __address ioaddr, size_t size) |
124 | { |
133 | { |
125 | ipl_t ipl; |
134 | ipl_t ipl; |
126 | cap_t caps; |
135 | cap_t caps; |
127 | task_t *t; |
136 | task_t *t; |
128 | int rc; |
137 | int rc; |
129 | 138 | ||
130 | /* |
139 | /* |
131 | * Make sure the caller is authorised to make this syscall. |
140 | * Make sure the caller is authorised to make this syscall. |
132 | */ |
141 | */ |
133 | caps = cap_get(TASK); |
142 | caps = cap_get(TASK); |
134 | if (!(caps & CAP_IO_MANAGER)) |
143 | if (!(caps & CAP_IO_MANAGER)) |
135 | return EPERM; |
144 | return EPERM; |
136 | 145 | ||
137 | ipl = interrupts_disable(); |
146 | ipl = interrupts_disable(); |
138 | spinlock_lock(&tasks_lock); |
147 | spinlock_lock(&tasks_lock); |
139 | 148 | ||
140 | t = task_find_by_id(id); |
149 | t = task_find_by_id(id); |
141 | 150 | ||
142 | if (!t) { |
151 | if (!t) { |
143 | /* |
152 | /* |
144 | * There is no task with the specified ID. |
153 | * There is no task with the specified ID. |
145 | */ |
154 | */ |
146 | spinlock_unlock(&tasks_lock); |
155 | spinlock_unlock(&tasks_lock); |
147 | interrupts_restore(ipl); |
156 | interrupts_restore(ipl); |
148 | return ENOENT; |
157 | return ENOENT; |
149 | } |
158 | } |
150 | 159 | ||
151 | /* |
160 | /* |
152 | * TODO: We are currently lacking support for task destroying. |
161 | * TODO: We are currently lacking support for task destroying. |
153 | * Once it is added to the kernel, we must take care to |
162 | * Once it is added to the kernel, we must take care to |
154 | * synchronize in a way that prevents race conditions here. |
163 | * synchronize in a way that prevents race conditions here. |
155 | */ |
164 | */ |
156 | 165 | ||
157 | /* Lock the task and release the lock protecting tasks_btree. */ |
166 | /* Lock the task and release the lock protecting tasks_btree. */ |
158 | spinlock_lock(&t->lock); |
167 | spinlock_lock(&t->lock); |
159 | spinlock_unlock(&tasks_lock); |
168 | spinlock_unlock(&tasks_lock); |
160 | 169 | ||
161 | rc = ddi_iospace_enable_arch(t, ioaddr, size); |
170 | rc = ddi_iospace_enable_arch(t, ioaddr, size); |
162 | 171 | ||
163 | spinlock_unlock(&t->lock); |
172 | spinlock_unlock(&t->lock); |
164 | interrupts_restore(ipl); |
173 | interrupts_restore(ipl); |
165 | return rc; |
174 | return rc; |
166 | } |
175 | } |
167 | 176 | ||
168 | /** Wrapper for SYS_MAP_PHYSMEM syscall. |
177 | /** Wrapper for SYS_MAP_PHYSMEM syscall. |
169 | * |
178 | * |
170 | * @param User space address of memory DDI argument structure. |
179 | * @param User space address of memory DDI argument structure. |
171 | * |
180 | * |
172 | * @return 0 on success, otherwise it returns error code found in errno.h |
181 | * @return 0 on success, otherwise it returns error code found in errno.h |
173 | */ |
182 | */ |
174 | __native sys_physmem_map(ddi_memarg_t *uspace_mem_arg) |
183 | __native sys_physmem_map(ddi_memarg_t *uspace_mem_arg) |
175 | { |
184 | { |
176 | ddi_memarg_t arg; |
185 | ddi_memarg_t arg; |
177 | 186 | ||
178 | copy_from_uspace(&arg, uspace_mem_arg, sizeof(ddi_memarg_t)); |
187 | copy_from_uspace(&arg, uspace_mem_arg, sizeof(ddi_memarg_t)); |
179 | return (__native) ddi_physmem_map((task_id_t) arg.task_id, ALIGN_DOWN((__address) arg.phys_base, FRAME_SIZE), |
188 | return (__native) ddi_physmem_map((task_id_t) arg.task_id, ALIGN_DOWN((__address) arg.phys_base, FRAME_SIZE), |
180 | ALIGN_DOWN((__address) arg.virt_base, PAGE_SIZE), (count_t) arg.pages, |
189 | ALIGN_DOWN((__address) arg.virt_base, PAGE_SIZE), (count_t) arg.pages, |
181 | (bool) arg.writable); |
190 | (bool) arg.writable); |
182 | } |
191 | } |
183 | 192 | ||
184 | /** Wrapper for SYS_ENABLE_IOSPACE syscall. |
193 | /** Wrapper for SYS_ENABLE_IOSPACE syscall. |
185 | * |
194 | * |
186 | * @param User space address of DDI argument structure. |
195 | * @param User space address of DDI argument structure. |
187 | * |
196 | * |
188 | * @return 0 on success, otherwise it returns error code found in errno.h |
197 | * @return 0 on success, otherwise it returns error code found in errno.h |
189 | */ |
198 | */ |
190 | __native sys_iospace_enable(ddi_ioarg_t *uspace_io_arg) |
199 | __native sys_iospace_enable(ddi_ioarg_t *uspace_io_arg) |
191 | { |
200 | { |
192 | ddi_ioarg_t arg; |
201 | ddi_ioarg_t arg; |
193 | 202 | ||
194 | copy_from_uspace(&arg, uspace_io_arg, sizeof(ddi_ioarg_t)); |
203 | copy_from_uspace(&arg, uspace_io_arg, sizeof(ddi_ioarg_t)); |
195 | return (__native) ddi_iospace_enable((task_id_t) arg.task_id, (__address) arg.ioaddr, (size_t) arg.size); |
204 | return (__native) ddi_iospace_enable((task_id_t) arg.task_id, (__address) arg.ioaddr, (size_t) arg.size); |
196 | } |
205 | } |
197 | 206 | ||
198 | __native ddi_int_control(__native enable, __native *flags) |
207 | __native ddi_int_control(__native enable, __native *flags) |
199 | { |
208 | { |
200 | if (! cap_get(TASK) & CAP_INT_CONTROL) |
209 | if (! cap_get(TASK) & CAP_INT_CONTROL) |
201 | return EPERM; |
210 | return EPERM; |
202 | return ddi_int_control_arch(enable, flags); |
211 | return ddi_int_control_arch(enable, flags); |
203 | } |
212 | } |
204 | 213 |