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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 | /** @addtogroup genericddi |
29 | /** @addtogroup genericddi |
30 | * @{ |
30 | * @{ |
31 | */ |
31 | */ |
32 | 32 | ||
33 | /** |
33 | /** |
34 | * @file |
34 | * @file |
35 | * @brief Device Driver Interface functions. |
35 | * @brief Device Driver Interface functions. |
36 | * |
36 | * |
37 | * This file contains functions that comprise the Device Driver Interface. |
37 | * This file contains functions that comprise the Device Driver Interface. |
38 | * These are the functions for mapping physical memory and enabling I/O |
38 | * These are the functions for mapping physical memory and enabling I/O |
39 | * space to tasks. |
39 | * space to tasks. |
40 | */ |
40 | */ |
41 | 41 | ||
42 | #include <ddi/ddi.h> |
42 | #include <ddi/ddi.h> |
43 | #include <ddi/ddi_arg.h> |
43 | #include <ddi/ddi_arg.h> |
44 | #include <proc/task.h> |
44 | #include <proc/task.h> |
45 | #include <security/cap.h> |
45 | #include <security/cap.h> |
46 | #include <mm/frame.h> |
46 | #include <mm/frame.h> |
47 | #include <mm/as.h> |
47 | #include <mm/as.h> |
48 | #include <synch/spinlock.h> |
48 | #include <synch/spinlock.h> |
49 | #include <syscall/copy.h> |
49 | #include <syscall/copy.h> |
50 | #include <adt/btree.h> |
50 | #include <adt/btree.h> |
51 | #include <arch.h> |
51 | #include <arch.h> |
52 | #include <align.h> |
52 | #include <align.h> |
53 | #include <errno.h> |
53 | #include <errno.h> |
54 | 54 | ||
55 | /** This lock protects the parea_btree. */ |
55 | /** This lock protects the parea_btree. */ |
56 | SPINLOCK_INITIALIZE(parea_lock); |
56 | SPINLOCK_INITIALIZE(parea_lock); |
57 | 57 | ||
58 | /** B+tree with enabled physical memory areas. */ |
58 | /** B+tree with enabled physical memory areas. */ |
59 | static btree_t parea_btree; |
59 | static btree_t parea_btree; |
60 | 60 | ||
61 | /** Initialize DDI. */ |
61 | /** Initialize DDI. */ |
62 | void ddi_init(void) |
62 | void ddi_init(void) |
63 | { |
63 | { |
64 | btree_create(&parea_btree); |
64 | btree_create(&parea_btree); |
65 | } |
65 | } |
66 | 66 | ||
67 | /** Enable piece of physical memory for mapping by physmem_map(). |
67 | /** Enable piece of physical memory for mapping by physmem_map(). |
68 | * |
68 | * |
69 | * @param parea Pointer to physical area structure. |
69 | * @param parea Pointer to physical area structure. |
70 | * |
70 | * |
71 | * @todo This function doesn't check for overlaps. It depends on the kernel to |
71 | * @todo This function doesn't check for overlaps. It depends on the kernel to |
72 | * create disjunct physical memory areas. |
72 | * create disjunct physical memory areas. |
73 | */ |
73 | */ |
74 | void ddi_parea_register(parea_t *parea) |
74 | void ddi_parea_register(parea_t *parea) |
75 | { |
75 | { |
76 | ipl_t ipl; |
76 | ipl_t ipl; |
77 | 77 | ||
78 | ipl = interrupts_disable(); |
78 | ipl = interrupts_disable(); |
79 | spinlock_lock(&parea_lock); |
79 | spinlock_lock(&parea_lock); |
80 | 80 | ||
81 | /* |
81 | /* |
82 | * TODO: we should really check for overlaps here. |
82 | * TODO: we should really check for overlaps here. |
83 | * However, we should be safe because the kernel is pretty sane and |
83 | * However, we should be safe because the kernel is pretty sane and |
84 | * memory of different devices doesn't overlap. |
84 | * memory of different devices doesn't overlap. |
85 | */ |
85 | */ |
86 | btree_insert(&parea_btree, (btree_key_t) parea->pbase, parea, NULL); |
86 | btree_insert(&parea_btree, (btree_key_t) parea->pbase, parea, NULL); |
87 | 87 | ||
88 | spinlock_unlock(&parea_lock); |
88 | spinlock_unlock(&parea_lock); |
89 | interrupts_restore(ipl); |
89 | interrupts_restore(ipl); |
90 | } |
90 | } |
91 | 91 | ||
92 | /** Map piece of physical memory into virtual address space of current task. |
92 | /** Map piece of physical memory into virtual address space of current task. |
93 | * |
93 | * |
94 | * @param pf Physical address of the starting frame. |
94 | * @param pf Physical address of the starting frame. |
95 | * @param vp Virtual address of the starting page. |
95 | * @param vp Virtual address of the starting page. |
96 | * @param pages Number of pages to map. |
96 | * @param pages Number of pages to map. |
97 | * @param flags Address space area flags for the mapping. |
97 | * @param flags Address space area flags for the mapping. |
98 | * |
98 | * |
99 | * @return 0 on success, EPERM if the caller lacks capabilities to use this |
99 | * @return 0 on success, EPERM if the caller lacks capabilities to use this |
100 | * syscall, ENOENT if there is no task matching the specified ID or the |
100 | * syscall, ENOENT if there is no task matching the specified ID or the |
101 | * physical address space is not enabled for mapping and ENOMEM if there |
101 | * physical address space is not enabled for mapping and ENOMEM if there |
102 | * was a problem in creating address space area. |
102 | * was a problem in creating address space area. |
103 | */ |
103 | */ |
104 | static int ddi_physmem_map(uintptr_t pf, uintptr_t vp, count_t pages, int flags) |
104 | static int ddi_physmem_map(uintptr_t pf, uintptr_t vp, count_t pages, int flags) |
105 | { |
105 | { |
106 | ipl_t ipl; |
106 | ipl_t ipl; |
107 | cap_t caps; |
107 | cap_t caps; |
108 | mem_backend_data_t backend_data; |
108 | mem_backend_data_t backend_data; |
109 | 109 | ||
110 | backend_data.base = pf; |
110 | backend_data.base = pf; |
111 | backend_data.frames = pages; |
111 | backend_data.frames = pages; |
112 | 112 | ||
113 | /* |
113 | /* |
114 | * Make sure the caller is authorised to make this syscall. |
114 | * Make sure the caller is authorised to make this syscall. |
115 | */ |
115 | */ |
116 | caps = cap_get(TASK); |
116 | caps = cap_get(TASK); |
117 | if (!(caps & CAP_MEM_MANAGER)) |
117 | if (!(caps & CAP_MEM_MANAGER)) |
118 | return EPERM; |
118 | return EPERM; |
119 | 119 | ||
120 | ipl = interrupts_disable(); |
120 | ipl = interrupts_disable(); |
121 | 121 | ||
122 | /* |
122 | /* |
123 | * Check if the physical memory area is enabled for mapping. |
123 | * Check if the physical memory area is enabled for mapping. |
124 | * If the architecture supports virtually indexed caches, intercept |
124 | * If the architecture supports virtually indexed caches, intercept |
125 | * attempts to create an illegal address alias. |
125 | * attempts to create an illegal address alias. |
126 | */ |
126 | */ |
127 | spinlock_lock(&parea_lock); |
127 | spinlock_lock(&parea_lock); |
128 | parea_t *parea; |
128 | parea_t *parea; |
129 | btree_node_t *nodep; |
129 | btree_node_t *nodep; |
130 | parea = (parea_t *) btree_search(&parea_btree, (btree_key_t) pf, &nodep); |
130 | parea = (parea_t *) btree_search(&parea_btree, (btree_key_t) pf, &nodep); |
131 | if (!parea || parea->frames < pages || ((flags & AS_AREA_CACHEABLE) && |
131 | if (!parea || parea->frames < pages || ((flags & AS_AREA_CACHEABLE) && |
132 | !parea->cacheable) || (!(flags & AS_AREA_CACHEABLE) && |
132 | !parea->cacheable) || (!(flags & AS_AREA_CACHEABLE) && |
133 | parea->cacheable)) { |
133 | parea->cacheable)) { |
134 | /* |
134 | /* |
135 | * This physical memory area cannot be mapped. |
135 | * This physical memory area cannot be mapped. |
136 | */ |
136 | */ |
137 | spinlock_unlock(&parea_lock); |
137 | spinlock_unlock(&parea_lock); |
138 | interrupts_restore(ipl); |
138 | interrupts_restore(ipl); |
139 | return ENOENT; |
139 | return ENOENT; |
140 | } |
140 | } |
141 | spinlock_unlock(&parea_lock); |
141 | spinlock_unlock(&parea_lock); |
142 | 142 | ||
143 | spinlock_lock(&TASK->lock); |
143 | spinlock_lock(&TASK->lock); |
144 | 144 | ||
145 | if (!as_area_create(TASK->as, flags, pages * PAGE_SIZE, vp, AS_AREA_ATTR_NONE, |
145 | if (!as_area_create(TASK->as, flags, pages * PAGE_SIZE, vp, AS_AREA_ATTR_NONE, |
146 | &phys_backend, &backend_data)) { |
146 | &phys_backend, &backend_data)) { |
147 | /* |
147 | /* |
148 | * The address space area could not have been created. |
148 | * The address space area could not have been created. |
149 | * We report it using ENOMEM. |
149 | * We report it using ENOMEM. |
150 | */ |
150 | */ |
151 | spinlock_unlock(&TASK->lock); |
151 | spinlock_unlock(&TASK->lock); |
152 | interrupts_restore(ipl); |
152 | interrupts_restore(ipl); |
153 | return ENOMEM; |
153 | return ENOMEM; |
154 | } |
154 | } |
155 | 155 | ||
156 | /* |
156 | /* |
157 | * Mapping is created on-demand during page fault. |
157 | * Mapping is created on-demand during page fault. |
158 | */ |
158 | */ |
159 | 159 | ||
160 | spinlock_unlock(&TASK->lock); |
160 | spinlock_unlock(&TASK->lock); |
161 | interrupts_restore(ipl); |
161 | interrupts_restore(ipl); |
162 | return 0; |
162 | return 0; |
163 | } |
163 | } |
164 | 164 | ||
165 | /** Enable range of I/O space for task. |
165 | /** Enable range of I/O space for task. |
166 | * |
166 | * |
167 | * @param id Task ID of the destination task. |
167 | * @param id Task ID of the destination task. |
168 | * @param ioaddr Starting I/O address. |
168 | * @param ioaddr Starting I/O address. |
169 | * @param size Size of the enabled I/O space.. |
169 | * @param size Size of the enabled I/O space.. |
170 | * |
170 | * |
171 | * @return 0 on success, EPERM if the caller lacks capabilities to use this |
171 | * @return 0 on success, EPERM if the caller lacks capabilities to use this |
172 | * syscall, ENOENT if there is no task matching the specified ID. |
172 | * syscall, ENOENT if there is no task matching the specified ID. |
173 | */ |
173 | */ |
174 | static int ddi_iospace_enable(task_id_t id, uintptr_t ioaddr, size_t size) |
174 | static int ddi_iospace_enable(task_id_t id, uintptr_t ioaddr, size_t size) |
175 | { |
175 | { |
176 | ipl_t ipl; |
176 | ipl_t ipl; |
177 | cap_t caps; |
177 | cap_t caps; |
178 | task_t *t; |
178 | task_t *t; |
179 | int rc; |
179 | int rc; |
180 | 180 | ||
181 | /* |
181 | /* |
182 | * Make sure the caller is authorised to make this syscall. |
182 | * Make sure the caller is authorised to make this syscall. |
183 | */ |
183 | */ |
184 | caps = cap_get(TASK); |
184 | caps = cap_get(TASK); |
185 | if (!(caps & CAP_IO_MANAGER)) |
185 | if (!(caps & CAP_IO_MANAGER)) |
186 | return EPERM; |
186 | return EPERM; |
187 | 187 | ||
188 | ipl = interrupts_disable(); |
188 | ipl = interrupts_disable(); |
189 | spinlock_lock(&tasks_lock); |
189 | spinlock_lock(&tasks_lock); |
190 | 190 | ||
191 | t = task_find_by_id(id); |
191 | t = task_find_by_id(id); |
192 | 192 | ||
193 | if ((!t) || (!context_check(CONTEXT, t->context))) { |
193 | if ((!t) || (!context_check(CONTEXT, t->context))) { |
194 | /* |
194 | /* |
195 | * There is no task with the specified ID |
195 | * There is no task with the specified ID |
196 | * or the task belongs to a different security |
196 | * or the task belongs to a different security |
197 | * context. |
197 | * context. |
198 | */ |
198 | */ |
199 | spinlock_unlock(&tasks_lock); |
199 | spinlock_unlock(&tasks_lock); |
200 | interrupts_restore(ipl); |
200 | interrupts_restore(ipl); |
201 | return ENOENT; |
201 | return ENOENT; |
202 | } |
202 | } |
203 | 203 | ||
204 | /* Lock the task and release the lock protecting tasks_btree. */ |
204 | /* Lock the task and release the lock protecting tasks_btree. */ |
205 | spinlock_lock(&t->lock); |
205 | spinlock_lock(&t->lock); |
206 | spinlock_unlock(&tasks_lock); |
206 | spinlock_unlock(&tasks_lock); |
207 | 207 | ||
208 | rc = ddi_iospace_enable_arch(t, ioaddr, size); |
208 | rc = ddi_iospace_enable_arch(t, ioaddr, size); |
209 | 209 | ||
210 | spinlock_unlock(&t->lock); |
210 | spinlock_unlock(&t->lock); |
211 | interrupts_restore(ipl); |
211 | interrupts_restore(ipl); |
212 | return rc; |
212 | return rc; |
213 | } |
213 | } |
214 | 214 | ||
215 | /** Wrapper for SYS_PHYSMEM_MAP syscall. |
215 | /** Wrapper for SYS_PHYSMEM_MAP syscall. |
216 | * |
216 | * |
217 | * @param phys_base Physical base address to map |
217 | * @param phys_base Physical base address to map |
218 | * @param virt_base Destination virtual address |
218 | * @param virt_base Destination virtual address |
219 | * @param pages Number of pages |
219 | * @param pages Number of pages |
220 | * @param flags Flags of newly mapped pages |
220 | * @param flags Flags of newly mapped pages |
221 | * |
221 | * |
222 | * @return 0 on success, otherwise it returns error code found in errno.h |
222 | * @return 0 on success, otherwise it returns error code found in errno.h |
223 | */ |
223 | */ |
224 | unative_t sys_physmem_map(unative_t phys_base, unative_t virt_base, |
224 | unative_t sys_physmem_map(unative_t phys_base, unative_t virt_base, |
225 | unative_t pages, unative_t flags) |
225 | unative_t pages, unative_t flags) |
226 | { |
226 | { |
227 | return (unative_t) ddi_physmem_map(ALIGN_DOWN((uintptr_t) phys_base, |
227 | return (unative_t) ddi_physmem_map(ALIGN_DOWN((uintptr_t) phys_base, |
228 | FRAME_SIZE), ALIGN_DOWN((uintptr_t) virt_base, PAGE_SIZE), |
228 | FRAME_SIZE), ALIGN_DOWN((uintptr_t) virt_base, PAGE_SIZE), |
229 | (count_t) pages, (int) flags); |
229 | (count_t) pages, (int) flags); |
230 | } |
230 | } |
231 | 231 | ||
232 | /** Wrapper for SYS_ENABLE_IOSPACE syscall. |
232 | /** Wrapper for SYS_ENABLE_IOSPACE syscall. |
233 | * |
233 | * |
234 | * @param uspace_io_arg User space address of DDI argument structure. |
234 | * @param uspace_io_arg User space address of DDI argument structure. |
235 | * |
235 | * |
236 | * @return 0 on success, otherwise it returns error code found in errno.h |
236 | * @return 0 on success, otherwise it returns error code found in errno.h |
237 | */ |
237 | */ |
238 | unative_t sys_iospace_enable(ddi_ioarg_t *uspace_io_arg) |
238 | unative_t sys_iospace_enable(ddi_ioarg_t *uspace_io_arg) |
239 | { |
239 | { |
240 | ddi_ioarg_t arg; |
240 | ddi_ioarg_t arg; |
241 | int rc; |
241 | int rc; |
242 | 242 | ||
243 | rc = copy_from_uspace(&arg, uspace_io_arg, sizeof(ddi_ioarg_t)); |
243 | rc = copy_from_uspace(&arg, uspace_io_arg, sizeof(ddi_ioarg_t)); |
244 | if (rc != 0) |
244 | if (rc != 0) |
245 | return (unative_t) rc; |
245 | return (unative_t) rc; |
246 | 246 | ||
247 | return (unative_t) ddi_iospace_enable((task_id_t) arg.task_id, |
247 | return (unative_t) ddi_iospace_enable((task_id_t) arg.task_id, |
248 | (uintptr_t) arg.ioaddr, (size_t) arg.size); |
248 | (uintptr_t) arg.ioaddr, (size_t) arg.size); |
249 | } |
249 | } |
250 | 250 | ||
251 | /** Disable or enable preemption. |
251 | /** Disable or enable preemption. |
252 | * |
252 | * |
253 | * @param enable If non-zero, the preemption counter will be decremented, |
253 | * @param enable If non-zero, the preemption counter will be decremented, |
254 | * leading to potential enabling of preemption. Otherwise the preemption |
254 | * leading to potential enabling of preemption. Otherwise the preemption |
255 | * counter will be incremented, preventing preemption from occurring. |
255 | * counter will be incremented, preventing preemption from occurring. |
256 | * |
256 | * |
257 | * @return Zero on success or EPERM if callers capabilities are not sufficient. |
257 | * @return Zero on success or EPERM if callers capabilities are not sufficient. |
258 | */ |
258 | */ |
259 | unative_t sys_preempt_control(int enable) |
259 | unative_t sys_preempt_control(int enable) |
260 | { |
260 | { |
261 | if (!cap_get(TASK) & CAP_PREEMPT_CONTROL) |
261 | if (!cap_get(TASK) & CAP_PREEMPT_CONTROL) |
262 | return EPERM; |
262 | return EPERM; |
263 | if (enable) |
263 | if (enable) |
264 | preemption_enable(); |
264 | preemption_enable(); |
265 | else |
265 | else |
266 | preemption_disable(); |
266 | preemption_disable(); |
267 | return 0; |
267 | return 0; |
268 | } |
268 | } |
269 | 269 | ||
270 | /** @} |
270 | /** @} |
271 | */ |
271 | */ |
272 | 272 |