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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 <arch.h> |
50 | #include <arch.h> |
51 | #include <align.h> |
51 | #include <align.h> |
52 | #include <errno.h> |
52 | #include <errno.h> |
53 | 53 | ||
54 | /** Map piece of physical memory into virtual address space of current task. |
54 | /** Map piece of physical memory into virtual address space of current task. |
55 | * |
55 | * |
56 | * @param pf Physical frame address of the starting frame. |
56 | * @param pf Physical frame address of the starting frame. |
57 | * @param vp Virtual page address of the starting page. |
57 | * @param vp Virtual page address of the starting page. |
58 | * @param pages Number of pages to map. |
58 | * @param pages Number of pages to map. |
59 | * @param flags Address space area flags for the mapping. |
59 | * @param flags Address space area flags for the mapping. |
60 | * |
60 | * |
61 | * @return 0 on success, EPERM if the caller lacks capabilities to use this syscall, |
61 | * @return 0 on success, EPERM if the caller lacks capabilities to use this syscall, |
62 | * ENOENT if there is no task matching the specified ID and ENOMEM if |
62 | * ENOENT if there is no task matching the specified ID and ENOMEM if |
63 | * there was a problem in creating address space area. |
63 | * there was a problem in creating address space area. |
64 | */ |
64 | */ |
65 | static int ddi_physmem_map(uintptr_t pf, uintptr_t vp, count_t pages, int flags) |
65 | static int ddi_physmem_map(uintptr_t pf, uintptr_t vp, count_t pages, int flags) |
66 | { |
66 | { |
67 | ipl_t ipl; |
67 | ipl_t ipl; |
68 | cap_t caps; |
68 | cap_t caps; |
69 | mem_backend_data_t backend_data; |
69 | mem_backend_data_t backend_data; |
70 | 70 | ||
71 | backend_data.base = pf; |
71 | backend_data.base = pf; |
72 | backend_data.frames = pages; |
72 | backend_data.frames = pages; |
73 | 73 | ||
74 | /* |
74 | /* |
75 | * Make sure the caller is authorised to make this syscall. |
75 | * Make sure the caller is authorised to make this syscall. |
76 | */ |
76 | */ |
77 | caps = cap_get(TASK); |
77 | caps = cap_get(TASK); |
78 | if (!(caps & CAP_MEM_MANAGER)) |
78 | if (!(caps & CAP_MEM_MANAGER)) |
79 | return EPERM; |
79 | return EPERM; |
80 | 80 | ||
81 | ipl = interrupts_disable(); |
81 | ipl = interrupts_disable(); |
82 | spinlock_lock(&TASK->lock); |
82 | spinlock_lock(&TASK->lock); |
83 | 83 | ||
84 | if (!as_area_create(TASK->as, flags, pages * PAGE_SIZE, vp, AS_AREA_ATTR_NONE, |
84 | if (!as_area_create(TASK->as, flags, pages * PAGE_SIZE, vp, AS_AREA_ATTR_NONE, |
85 | &phys_backend, &backend_data)) { |
85 | &phys_backend, &backend_data)) { |
86 | /* |
86 | /* |
87 | * The address space area could not have been created. |
87 | * The address space area could not have been created. |
88 | * We report it using ENOMEM. |
88 | * We report it using ENOMEM. |
89 | */ |
89 | */ |
90 | spinlock_unlock(&TASK->lock); |
90 | spinlock_unlock(&TASK->lock); |
91 | interrupts_restore(ipl); |
91 | interrupts_restore(ipl); |
92 | return ENOMEM; |
92 | return ENOMEM; |
93 | } |
93 | } |
94 | 94 | ||
95 | /* |
95 | /* |
96 | * Mapping is created on-demand during page fault. |
96 | * Mapping is created on-demand during page fault. |
97 | */ |
97 | */ |
98 | 98 | ||
99 | spinlock_unlock(&TASK->lock); |
99 | spinlock_unlock(&TASK->lock); |
100 | interrupts_restore(ipl); |
100 | interrupts_restore(ipl); |
101 | return 0; |
101 | return 0; |
102 | } |
102 | } |
103 | 103 | ||
104 | /** Enable range of I/O space for task. |
104 | /** Enable range of I/O space for task. |
105 | * |
105 | * |
106 | * @param id Task ID of the destination task. |
106 | * @param id Task ID of the destination task. |
107 | * @param ioaddr Starting I/O address. |
107 | * @param ioaddr Starting I/O address. |
108 | * @param size Size of the enabled I/O space.. |
108 | * @param size Size of the enabled I/O space.. |
109 | * |
109 | * |
110 | * @return 0 on success, EPERM if the caller lacks capabilities to use this syscall, |
110 | * @return 0 on success, EPERM if the caller lacks capabilities to use this syscall, |
111 | * ENOENT if there is no task matching the specified ID. |
111 | * ENOENT if there is no task matching the specified ID. |
112 | */ |
112 | */ |
113 | static int ddi_iospace_enable(task_id_t id, uintptr_t ioaddr, size_t size) |
113 | static int ddi_iospace_enable(task_id_t id, uintptr_t ioaddr, size_t size) |
114 | { |
114 | { |
115 | ipl_t ipl; |
115 | ipl_t ipl; |
116 | cap_t caps; |
116 | cap_t caps; |
117 | task_t *t; |
117 | task_t *t; |
118 | int rc; |
118 | int rc; |
119 | 119 | ||
120 | /* |
120 | /* |
121 | * Make sure the caller is authorised to make this syscall. |
121 | * Make sure the caller is authorised to make this syscall. |
122 | */ |
122 | */ |
123 | caps = cap_get(TASK); |
123 | caps = cap_get(TASK); |
124 | if (!(caps & CAP_IO_MANAGER)) |
124 | if (!(caps & CAP_IO_MANAGER)) |
125 | return EPERM; |
125 | return EPERM; |
126 | 126 | ||
127 | ipl = interrupts_disable(); |
127 | ipl = interrupts_disable(); |
128 | spinlock_lock(&tasks_lock); |
128 | spinlock_lock(&tasks_lock); |
129 | 129 | ||
130 | t = task_find_by_id(id); |
130 | t = task_find_by_id(id); |
131 | 131 | ||
132 | if (!t) { |
132 | if (!t) { |
133 | /* |
133 | /* |
134 | * There is no task with the specified ID. |
134 | * There is no task with the specified ID. |
135 | */ |
135 | */ |
136 | spinlock_unlock(&tasks_lock); |
136 | spinlock_unlock(&tasks_lock); |
137 | interrupts_restore(ipl); |
137 | interrupts_restore(ipl); |
138 | return ENOENT; |
138 | return ENOENT; |
139 | } |
139 | } |
140 | 140 | ||
141 | /* Lock the task and release the lock protecting tasks_btree. */ |
141 | /* Lock the task and release the lock protecting tasks_btree. */ |
142 | spinlock_lock(&t->lock); |
142 | spinlock_lock(&t->lock); |
143 | spinlock_unlock(&tasks_lock); |
143 | spinlock_unlock(&tasks_lock); |
144 | 144 | ||
145 | rc = ddi_iospace_enable_arch(t, ioaddr, size); |
145 | rc = ddi_iospace_enable_arch(t, ioaddr, size); |
146 | 146 | ||
147 | spinlock_unlock(&t->lock); |
147 | spinlock_unlock(&t->lock); |
148 | interrupts_restore(ipl); |
148 | interrupts_restore(ipl); |
149 | return rc; |
149 | return rc; |
150 | } |
150 | } |
151 | 151 | ||
152 | /** Wrapper for SYS_MAP_PHYSMEM syscall. |
152 | /** Wrapper for SYS_MAP_PHYSMEM syscall. |
153 | * |
153 | * |
154 | * @param phys_base Physical base address to map |
154 | * @param phys_base Physical base address to map |
155 | * @param virt_base Destination virtual address |
155 | * @param virt_base Destination virtual address |
156 | * @param pages Number of pages |
156 | * @param pages Number of pages |
157 | * @param flags Flags of newly mapped pages |
157 | * @param flags Flags of newly mapped pages |
158 | * |
158 | * |
159 | * @return 0 on success, otherwise it returns error code found in errno.h |
159 | * @return 0 on success, otherwise it returns error code found in errno.h |
160 | */ |
160 | */ |
161 | unative_t sys_physmem_map(unative_t phys_base, unative_t virt_base, unative_t pages, |
161 | unative_t sys_physmem_map(unative_t phys_base, unative_t virt_base, unative_t pages, |
162 | unative_t flags) |
162 | unative_t flags) |
163 | { |
163 | { |
164 | return (unative_t) ddi_physmem_map(ALIGN_DOWN((uintptr_t) phys_base, FRAME_SIZE), |
164 | return (unative_t) ddi_physmem_map(ALIGN_DOWN((uintptr_t) phys_base, FRAME_SIZE), |
165 | ALIGN_DOWN((uintptr_t) virt_base, PAGE_SIZE), (count_t) pages, |
165 | ALIGN_DOWN((uintptr_t) virt_base, PAGE_SIZE), (count_t) pages, |
166 | (int) flags); |
166 | (int) flags); |
167 | } |
167 | } |
168 | 168 | ||
169 | /** Wrapper for SYS_ENABLE_IOSPACE syscall. |
169 | /** Wrapper for SYS_ENABLE_IOSPACE syscall. |
170 | * |
170 | * |
171 | * @param uspace_io_arg User space address of DDI argument structure. |
171 | * @param uspace_io_arg User space address of DDI argument structure. |
172 | * |
172 | * |
173 | * @return 0 on success, otherwise it returns error code found in errno.h |
173 | * @return 0 on success, otherwise it returns error code found in errno.h |
174 | */ |
174 | */ |
175 | unative_t sys_iospace_enable(ddi_ioarg_t *uspace_io_arg) |
175 | unative_t sys_iospace_enable(ddi_ioarg_t *uspace_io_arg) |
176 | { |
176 | { |
177 | ddi_ioarg_t arg; |
177 | ddi_ioarg_t arg; |
178 | int rc; |
178 | int rc; |
179 | 179 | ||
180 | rc = copy_from_uspace(&arg, uspace_io_arg, sizeof(ddi_ioarg_t)); |
180 | rc = copy_from_uspace(&arg, uspace_io_arg, sizeof(ddi_ioarg_t)); |
181 | if (rc != 0) |
181 | if (rc != 0) |
182 | return (unative_t) rc; |
182 | return (unative_t) rc; |
183 | 183 | ||
184 | return (unative_t) ddi_iospace_enable((task_id_t) arg.task_id, (uintptr_t) arg.ioaddr, (size_t) arg.size); |
184 | return (unative_t) ddi_iospace_enable((task_id_t) arg.task_id, (uintptr_t) arg.ioaddr, (size_t) arg.size); |
185 | } |
185 | } |
186 | 186 | ||
187 | /** Disable or enable preemption. |
187 | /** Disable or enable preemption. |
188 | * |
188 | * |
189 | * @param enable If non-zero, the preemption counter will be decremented, leading to potential |
189 | * @param enable If non-zero, the preemption counter will be decremented, leading to potential |
190 | * enabling of preemption. Otherwise the preemption counter will be incremented, |
190 | * enabling of preemption. Otherwise the preemption counter will be incremented, |
191 | * preventing preemption from occurring. |
191 | * preventing preemption from occurring. |
192 | * |
192 | * |
193 | * @return Zero on success or EPERM if callers capabilities are not sufficient. |
193 | * @return Zero on success or EPERM if callers capabilities are not sufficient. |
194 | */ |
194 | */ |
195 | unative_t sys_preempt_control(int enable) |
195 | unative_t sys_preempt_control(int enable) |
196 | { |
196 | { |
197 | if (! cap_get(TASK) & CAP_PREEMPT_CONTROL) |
197 | if (! cap_get(TASK) & CAP_PREEMPT_CONTROL) |
198 | return EPERM; |
198 | return EPERM; |
199 | if (enable) |
199 | if (enable) |
200 | preemption_enable(); |
200 | preemption_enable(); |
201 | else |
201 | else |
202 | preemption_disable(); |
202 | preemption_disable(); |
203 | return 0; |
203 | return 0; |
204 | } |
204 | } |
205 | 205 | ||
206 | /** @} |
206 | /** @} |
207 | */ |
207 | */ |
208 | 208 | ||
209 | 209 |