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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 | /** |
29 | /** |
30 | * @file ddi.c |
30 | * @file ddi.c |
31 | * @brief Device Driver Interface functions. |
31 | * @brief Device Driver Interface functions. |
32 | * |
32 | * |
33 | * This file contains functions that comprise the Device Driver Interface. |
33 | * This file contains functions that comprise the Device Driver Interface. |
34 | * These are the functions for mapping physical memory and enabling I/O |
34 | * These are the functions for mapping physical memory and enabling I/O |
35 | * space to tasks. |
35 | * space to tasks. |
36 | */ |
36 | */ |
37 | 37 | ||
38 | #include <ddi/ddi.h> |
38 | #include <ddi/ddi.h> |
39 | #include <ddi/ddi_arg.h> |
39 | #include <ddi/ddi_arg.h> |
40 | #include <proc/task.h> |
40 | #include <proc/task.h> |
41 | #include <security/cap.h> |
41 | #include <security/cap.h> |
42 | #include <mm/frame.h> |
42 | #include <mm/frame.h> |
43 | #include <mm/as.h> |
43 | #include <mm/as.h> |
44 | #include <synch/spinlock.h> |
44 | #include <synch/spinlock.h> |
45 | #include <syscall/copy.h> |
45 | #include <syscall/copy.h> |
46 | #include <arch.h> |
46 | #include <arch.h> |
47 | #include <align.h> |
47 | #include <align.h> |
48 | #include <errno.h> |
48 | #include <errno.h> |
49 | 49 | ||
50 | /** 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. |
51 | * |
51 | * |
52 | * @param id Task ID of the destination task. |
52 | * @param id Task ID of the destination task. |
53 | * @param pf Physical frame address of the starting frame. |
53 | * @param pf Physical frame address of the starting frame. |
54 | * @param vp Virtual page address of the starting page. |
54 | * @param vp Virtual page address of the starting page. |
55 | * @param pages Number of pages to map. |
55 | * @param pages Number of pages to map. |
56 | * @param writable If true, the mapping will be created writable. |
56 | * @param writable If true, the mapping will be created writable. |
57 | * |
57 | * |
58 | * @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, |
59 | * 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 |
60 | * there was a problem in creating address space area. |
60 | * there was a problem in creating address space area. |
61 | */ |
61 | */ |
62 | 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) |
63 | { |
63 | { |
64 | ipl_t ipl; |
64 | ipl_t ipl; |
65 | cap_t caps; |
65 | cap_t caps; |
66 | task_t *t; |
66 | task_t *t; |
67 | int flags; |
67 | int flags; |
68 | mem_backend_data_t backend_data = { .d1 = (__native) pf, .d2 = (__native) pages }; |
68 | mem_backend_data_t backend_data; |
- | 69 | ||
- | 70 | backend_data.base = pf; |
|
- | 71 | backend_data.frames = pages; |
|
69 | 72 | ||
70 | /* |
73 | /* |
71 | * Make sure the caller is authorised to make this syscall. |
74 | * Make sure the caller is authorised to make this syscall. |
72 | */ |
75 | */ |
73 | caps = cap_get(TASK); |
76 | caps = cap_get(TASK); |
74 | if (!(caps & CAP_MEM_MANAGER)) |
77 | if (!(caps & CAP_MEM_MANAGER)) |
75 | return EPERM; |
78 | return EPERM; |
76 | 79 | ||
77 | ipl = interrupts_disable(); |
80 | ipl = interrupts_disable(); |
78 | spinlock_lock(&tasks_lock); |
81 | spinlock_lock(&tasks_lock); |
79 | 82 | ||
80 | t = task_find_by_id(id); |
83 | t = task_find_by_id(id); |
81 | 84 | ||
82 | if (!t) { |
85 | if (!t) { |
83 | /* |
86 | /* |
84 | * There is no task with the specified ID. |
87 | * There is no task with the specified ID. |
85 | */ |
88 | */ |
86 | spinlock_unlock(&tasks_lock); |
89 | spinlock_unlock(&tasks_lock); |
87 | interrupts_restore(ipl); |
90 | interrupts_restore(ipl); |
88 | return ENOENT; |
91 | return ENOENT; |
89 | } |
92 | } |
90 | 93 | ||
91 | /* |
94 | /* |
92 | * TODO: We are currently lacking support for task destroying. |
95 | * TODO: We are currently lacking support for task destroying. |
93 | * Once it is added to the kernel, we must take care to |
96 | * Once it is added to the kernel, we must take care to |
94 | * synchronize in a way that prevents race conditions here. |
97 | * synchronize in a way that prevents race conditions here. |
95 | */ |
98 | */ |
96 | 99 | ||
97 | /* Lock the task and release the lock protecting tasks_btree. */ |
100 | /* Lock the task and release the lock protecting tasks_btree. */ |
98 | spinlock_lock(&t->lock); |
101 | spinlock_lock(&t->lock); |
99 | spinlock_unlock(&tasks_lock); |
102 | spinlock_unlock(&tasks_lock); |
100 | 103 | ||
101 | flags = AS_AREA_READ; |
104 | flags = AS_AREA_READ; |
102 | if (writable) |
105 | if (writable) |
103 | flags |= AS_AREA_WRITE; |
106 | flags |= AS_AREA_WRITE; |
104 | if (!as_area_create(t->as, flags, pages * PAGE_SIZE, vp, AS_AREA_ATTR_NONE, |
107 | if (!as_area_create(t->as, flags, pages * PAGE_SIZE, vp, AS_AREA_ATTR_NONE, |
105 | &phys_backend, &backend_data)) { |
108 | &phys_backend, &backend_data)) { |
106 | /* |
109 | /* |
107 | * The address space area could not have been created. |
110 | * The address space area could not have been created. |
108 | * We report it using ENOMEM. |
111 | * We report it using ENOMEM. |
109 | */ |
112 | */ |
110 | spinlock_unlock(&t->lock); |
113 | spinlock_unlock(&t->lock); |
111 | interrupts_restore(ipl); |
114 | interrupts_restore(ipl); |
112 | return ENOMEM; |
115 | return ENOMEM; |
113 | } |
116 | } |
114 | 117 | ||
115 | /* |
118 | /* |
116 | * Mapping is created on-demand during page fault. |
119 | * Mapping is created on-demand during page fault. |
117 | */ |
120 | */ |
118 | 121 | ||
119 | spinlock_unlock(&t->lock); |
122 | spinlock_unlock(&t->lock); |
120 | interrupts_restore(ipl); |
123 | interrupts_restore(ipl); |
121 | return 0; |
124 | return 0; |
122 | } |
125 | } |
123 | 126 | ||
124 | /** Enable range of I/O space for task. |
127 | /** Enable range of I/O space for task. |
125 | * |
128 | * |
126 | * @param id Task ID of the destination task. |
129 | * @param id Task ID of the destination task. |
127 | * @param ioaddr Starting I/O address. |
130 | * @param ioaddr Starting I/O address. |
128 | * @param size Size of the enabled I/O space.. |
131 | * @param size Size of the enabled I/O space.. |
129 | * |
132 | * |
130 | * @return 0 on success, EPERM if the caller lacks capabilities to use this syscall, |
133 | * @return 0 on success, EPERM if the caller lacks capabilities to use this syscall, |
131 | * ENOENT if there is no task matching the specified ID. |
134 | * ENOENT if there is no task matching the specified ID. |
132 | */ |
135 | */ |
133 | static int ddi_iospace_enable(task_id_t id, __address ioaddr, size_t size) |
136 | static int ddi_iospace_enable(task_id_t id, __address ioaddr, size_t size) |
134 | { |
137 | { |
135 | ipl_t ipl; |
138 | ipl_t ipl; |
136 | cap_t caps; |
139 | cap_t caps; |
137 | task_t *t; |
140 | task_t *t; |
138 | int rc; |
141 | int rc; |
139 | 142 | ||
140 | /* |
143 | /* |
141 | * Make sure the caller is authorised to make this syscall. |
144 | * Make sure the caller is authorised to make this syscall. |
142 | */ |
145 | */ |
143 | caps = cap_get(TASK); |
146 | caps = cap_get(TASK); |
144 | if (!(caps & CAP_IO_MANAGER)) |
147 | if (!(caps & CAP_IO_MANAGER)) |
145 | return EPERM; |
148 | return EPERM; |
146 | 149 | ||
147 | ipl = interrupts_disable(); |
150 | ipl = interrupts_disable(); |
148 | spinlock_lock(&tasks_lock); |
151 | spinlock_lock(&tasks_lock); |
149 | 152 | ||
150 | t = task_find_by_id(id); |
153 | t = task_find_by_id(id); |
151 | 154 | ||
152 | if (!t) { |
155 | if (!t) { |
153 | /* |
156 | /* |
154 | * There is no task with the specified ID. |
157 | * There is no task with the specified ID. |
155 | */ |
158 | */ |
156 | spinlock_unlock(&tasks_lock); |
159 | spinlock_unlock(&tasks_lock); |
157 | interrupts_restore(ipl); |
160 | interrupts_restore(ipl); |
158 | return ENOENT; |
161 | return ENOENT; |
159 | } |
162 | } |
160 | 163 | ||
161 | /* |
164 | /* |
162 | * TODO: We are currently lacking support for task destroying. |
165 | * TODO: We are currently lacking support for task destroying. |
163 | * Once it is added to the kernel, we must take care to |
166 | * Once it is added to the kernel, we must take care to |
164 | * synchronize in a way that prevents race conditions here. |
167 | * synchronize in a way that prevents race conditions here. |
165 | */ |
168 | */ |
166 | 169 | ||
167 | /* Lock the task and release the lock protecting tasks_btree. */ |
170 | /* Lock the task and release the lock protecting tasks_btree. */ |
168 | spinlock_lock(&t->lock); |
171 | spinlock_lock(&t->lock); |
169 | spinlock_unlock(&tasks_lock); |
172 | spinlock_unlock(&tasks_lock); |
170 | 173 | ||
171 | rc = ddi_iospace_enable_arch(t, ioaddr, size); |
174 | rc = ddi_iospace_enable_arch(t, ioaddr, size); |
172 | 175 | ||
173 | spinlock_unlock(&t->lock); |
176 | spinlock_unlock(&t->lock); |
174 | interrupts_restore(ipl); |
177 | interrupts_restore(ipl); |
175 | return rc; |
178 | return rc; |
176 | } |
179 | } |
177 | 180 | ||
178 | /** Wrapper for SYS_MAP_PHYSMEM syscall. |
181 | /** Wrapper for SYS_MAP_PHYSMEM syscall. |
179 | * |
182 | * |
180 | * @param User space address of memory DDI argument structure. |
183 | * @param User space address of memory DDI argument structure. |
181 | * |
184 | * |
182 | * @return 0 on success, otherwise it returns error code found in errno.h |
185 | * @return 0 on success, otherwise it returns error code found in errno.h |
183 | */ |
186 | */ |
184 | __native sys_physmem_map(ddi_memarg_t *uspace_mem_arg) |
187 | __native sys_physmem_map(ddi_memarg_t *uspace_mem_arg) |
185 | { |
188 | { |
186 | ddi_memarg_t arg; |
189 | ddi_memarg_t arg; |
187 | int rc; |
190 | int rc; |
188 | 191 | ||
189 | rc = copy_from_uspace(&arg, uspace_mem_arg, sizeof(ddi_memarg_t)); |
192 | rc = copy_from_uspace(&arg, uspace_mem_arg, sizeof(ddi_memarg_t)); |
190 | if (rc != 0) |
193 | if (rc != 0) |
191 | return (__native) rc; |
194 | return (__native) rc; |
192 | 195 | ||
193 | return (__native) ddi_physmem_map((task_id_t) arg.task_id, ALIGN_DOWN((__address) arg.phys_base, FRAME_SIZE), |
196 | return (__native) ddi_physmem_map((task_id_t) arg.task_id, ALIGN_DOWN((__address) arg.phys_base, FRAME_SIZE), |
194 | ALIGN_DOWN((__address) arg.virt_base, PAGE_SIZE), (count_t) arg.pages, |
197 | ALIGN_DOWN((__address) arg.virt_base, PAGE_SIZE), (count_t) arg.pages, |
195 | (bool) arg.writable); |
198 | (bool) arg.writable); |
196 | } |
199 | } |
197 | 200 | ||
198 | /** Wrapper for SYS_ENABLE_IOSPACE syscall. |
201 | /** Wrapper for SYS_ENABLE_IOSPACE syscall. |
199 | * |
202 | * |
200 | * @param User space address of DDI argument structure. |
203 | * @param User space address of DDI argument structure. |
201 | * |
204 | * |
202 | * @return 0 on success, otherwise it returns error code found in errno.h |
205 | * @return 0 on success, otherwise it returns error code found in errno.h |
203 | */ |
206 | */ |
204 | __native sys_iospace_enable(ddi_ioarg_t *uspace_io_arg) |
207 | __native sys_iospace_enable(ddi_ioarg_t *uspace_io_arg) |
205 | { |
208 | { |
206 | ddi_ioarg_t arg; |
209 | ddi_ioarg_t arg; |
207 | int rc; |
210 | int rc; |
208 | 211 | ||
209 | rc = copy_from_uspace(&arg, uspace_io_arg, sizeof(ddi_ioarg_t)); |
212 | rc = copy_from_uspace(&arg, uspace_io_arg, sizeof(ddi_ioarg_t)); |
210 | if (rc != 0) |
213 | if (rc != 0) |
211 | return (__native) rc; |
214 | return (__native) rc; |
212 | 215 | ||
213 | return (__native) ddi_iospace_enable((task_id_t) arg.task_id, (__address) arg.ioaddr, (size_t) arg.size); |
216 | return (__native) ddi_iospace_enable((task_id_t) arg.task_id, (__address) arg.ioaddr, (size_t) arg.size); |
214 | } |
217 | } |
215 | 218 | ||
216 | /** Disable or enable preemption. |
219 | /** Disable or enable preemption. |
217 | * |
220 | * |
218 | * @param enable If non-zero, the preemption counter will be decremented, leading to potential |
221 | * @param enable If non-zero, the preemption counter will be decremented, leading to potential |
219 | * enabling of preemption. Otherwise the preemption counter will be incremented, |
222 | * enabling of preemption. Otherwise the preemption counter will be incremented, |
220 | * preventing preemption from occurring. |
223 | * preventing preemption from occurring. |
221 | * |
224 | * |
222 | * @return Zero on success or EPERM if callers capabilities are not sufficient. |
225 | * @return Zero on success or EPERM if callers capabilities are not sufficient. |
223 | */ |
226 | */ |
224 | __native sys_preempt_control(int enable) |
227 | __native sys_preempt_control(int enable) |
225 | { |
228 | { |
226 | if (! cap_get(TASK) & CAP_PREEMPT_CONTROL) |
229 | if (! cap_get(TASK) & CAP_PREEMPT_CONTROL) |
227 | return EPERM; |
230 | return EPERM; |
228 | if (enable) |
231 | if (enable) |
229 | preemption_enable(); |
232 | preemption_enable(); |
230 | else |
233 | else |
231 | preemption_disable(); |
234 | preemption_disable(); |
232 | return 0; |
235 | return 0; |
233 | } |
236 | } |
234 | 237 |