WebSVN – HelenOS-historic – Diff – /kernel/trunk/generic/src/ddi/ddi.c


/*
 * Copyright (C) 2006 Jakub Jermar
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 * - The name of the author may not be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
 
/**
 * @file    ddi.c
 * @brief   Device Driver Interface functions.
 *
 * This file contains functions that comprise the Device Driver Interface.
 * These are the functions for mapping physical memory and enabling I/O
 * space to tasks.
 */
 
#include <ddi/ddi.h>
#include <ddi/ddi_arg.h>
#include <proc/task.h>
#include <security/cap.h>
#include <mm/frame.h>
#include <mm/as.h>
#include <synch/spinlock.h>
#include <syscall/copy.h>
#include <arch.h>
#include <align.h>
#include <errno.h>
 
/** Map piece of physical memory into virtual address space of specified task.
 *
 * @param id Task ID of the destination task.
 * @param pf Physical frame address of the starting frame.
 * @param vp Virtual page address of the starting page.
 * @param pages Number of pages to map.
 * @param flags Address space area flags for the mapping.
 *
 * @return 0 on success, EPERM if the caller lacks capabilities to use this syscall,
 *     ENOENT if there is no task matching the specified ID and ENOMEM if
 *     there was a problem in creating address space area.
 */
static int ddi_physmem_map(task_id_t id, __address pf, __address vp, count_t pages, int flags)
{
    ipl_t ipl;
    cap_t caps;
    task_t *t;
 
    mem_backend_data_t backend_data;
 
    backend_data.base = pf;
    backend_data.frames = pages;
   
    /*
     * Make sure the caller is authorised to make this syscall.
     */
    caps = cap_get(TASK);
    if (!(caps & CAP_MEM_MANAGER))
        return EPERM;
   
    ipl = interrupts_disable();
    spinlock_lock(&tasks_lock);
   
    t = task_find_by_id(id);
   
    if (!t) {
        /*
         * There is no task with the specified ID.
         */
        spinlock_unlock(&tasks_lock);
        interrupts_restore(ipl);
        return ENOENT;
    }
 
    /*
     * TODO: We are currently lacking support for task destroying.
     * Once it is added to the kernel, we must take care to
     * synchronize in a way that prevents race conditions here.
     */
   
    /* Lock the task and release the lock protecting tasks_btree. */
    spinlock_lock(&t->lock);
    spinlock_unlock(&tasks_lock);
   
 
 
 
    if (!as_area_create(t->as, flags, pages * PAGE_SIZE, vp, AS_AREA_ATTR_NONE,
        &phys_backend, &backend_data)) {
        /*
         * The address space area could not have been created.
         * We report it using ENOMEM.
         */
        spinlock_unlock(&t->lock);
        interrupts_restore(ipl);
        return ENOMEM;
    }
   
    /*
     * Mapping is created on-demand during page fault.
     */
   
    spinlock_unlock(&t->lock);
    interrupts_restore(ipl);
    return 0;
}
 
/** Enable range of I/O space for task.
 *
 * @param id Task ID of the destination task.
 * @param ioaddr Starting I/O address.
 * @param size Size of the enabled I/O space..
 *
 * @return 0 on success, EPERM if the caller lacks capabilities to use this syscall,
 *     ENOENT if there is no task matching the specified ID.
 */
static int ddi_iospace_enable(task_id_t id, __address ioaddr, size_t size)
{
    ipl_t ipl;
    cap_t caps;
    task_t *t;
    int rc;
   
    /*
     * Make sure the caller is authorised to make this syscall.
     */
    caps = cap_get(TASK);
    if (!(caps & CAP_IO_MANAGER))
        return EPERM;
   
    ipl = interrupts_disable();
    spinlock_lock(&tasks_lock);
   
    t = task_find_by_id(id);
   
    if (!t) {
        /*
         * There is no task with the specified ID.
         */
        spinlock_unlock(&tasks_lock);
        interrupts_restore(ipl);
        return ENOENT;
    }
 
    /*
     * TODO: We are currently lacking support for task destroying.
     * Once it is added to the kernel, we must take care to
     * synchronize in a way that prevents race conditions here.
     */
   
    /* Lock the task and release the lock protecting tasks_btree. */
    spinlock_lock(&t->lock);
    spinlock_unlock(&tasks_lock);
 
    rc = ddi_iospace_enable_arch(t, ioaddr, size);
   
    spinlock_unlock(&t->lock);
    interrupts_restore(ipl);
    return rc;
}
 
/** Wrapper for SYS_MAP_PHYSMEM syscall.
 *
 * @param User space address of memory DDI argument structure.
 *
 * @return 0 on success, otherwise it returns error code found in errno.h
 */
__native sys_physmem_map(ddi_memarg_t *uspace_mem_arg)
{
    ddi_memarg_t arg;
    int rc;
   
    rc = copy_from_uspace(&arg, uspace_mem_arg, sizeof(ddi_memarg_t));
    if (rc != 0)
        return (__native) rc;
       
    return (__native) ddi_physmem_map((task_id_t) arg.task_id, ALIGN_DOWN((__address) arg.phys_base, FRAME_SIZE),
                      ALIGN_DOWN((__address) arg.virt_base, PAGE_SIZE), (count_t) arg.pages,
                      (int) arg.flags);
}
 
/** Wrapper for SYS_ENABLE_IOSPACE syscall.
 *
 * @param User space address of DDI argument structure.
 *
 * @return 0 on success, otherwise it returns error code found in errno.h
 */
__native sys_iospace_enable(ddi_ioarg_t *uspace_io_arg)
{
    ddi_ioarg_t arg;
    int rc;
   
    rc = copy_from_uspace(&arg, uspace_io_arg, sizeof(ddi_ioarg_t));
    if (rc != 0)
        return (__native) rc;
       
    return (__native) ddi_iospace_enable((task_id_t) arg.task_id, (__address) arg.ioaddr, (size_t) arg.size);
}
 
/** Disable or enable preemption.
 *
 * @param enable If non-zero, the preemption counter will be decremented, leading to potential
 *       enabling of preemption. Otherwise the preemption counter will be incremented,
 *       preventing preemption from occurring.
 *
 * @return Zero on success or EPERM if callers capabilities are not sufficient.
 */
__native sys_preempt_control(int enable)
{
        if (! cap_get(TASK) & CAP_PREEMPT_CONTROL)
                return EPERM;
        if (enable)
                preemption_enable();
        else
                preemption_disable();
        return 0;
}
 

Rev 1425	Rev 1429
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 flags Address space area flags for the mapping.
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, int flags)
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;	-
68	mem_backend_data_t backend_data;	67	mem_backend_data_t backend_data;
69		68
70	backend_data.base = pf;	69	backend_data.base = pf;
71	backend_data.frames = pages;	70	backend_data.frames = pages;
72		71
73	/*	72	/*
74	* Make sure the caller is authorised to make this syscall.	73	* Make sure the caller is authorised to make this syscall.
75	*/	74	*/
76	caps = cap_get(TASK);	75	caps = cap_get(TASK);
77	if (!(caps & CAP_MEM_MANAGER))	76	if (!(caps & CAP_MEM_MANAGER))
78	return EPERM;	77	return EPERM;
79		78
80	ipl = interrupts_disable();	79	ipl = interrupts_disable();
81	spinlock_lock(&tasks_lock);	80	spinlock_lock(&tasks_lock);
82		81
83	t = task_find_by_id(id);	82	t = task_find_by_id(id);
84		83
85	if (!t) {	84	if (!t) {
86	/*	85	/*
87	* There is no task with the specified ID.	86	* There is no task with the specified ID.
88	*/	87	*/
89	spinlock_unlock(&tasks_lock);	88	spinlock_unlock(&tasks_lock);
90	interrupts_restore(ipl);	89	interrupts_restore(ipl);
91	return ENOENT;	90	return ENOENT;
92	}	91	}
93		92
94	/*	93	/*
95	* TODO: We are currently lacking support for task destroying.	94	* TODO: We are currently lacking support for task destroying.
96	* Once it is added to the kernel, we must take care to	95	* Once it is added to the kernel, we must take care to
97	* synchronize in a way that prevents race conditions here.	96	* synchronize in a way that prevents race conditions here.
98	*/	97	*/
99		98
100	/* Lock the task and release the lock protecting tasks_btree. */	99	/* Lock the task and release the lock protecting tasks_btree. */
101	spinlock_lock(&t->lock);	100	spinlock_lock(&t->lock);
102	spinlock_unlock(&tasks_lock);	101	spinlock_unlock(&tasks_lock);
103		102
104	flags = AS_AREA_READ;	-
105	if (writable)	-
106	flags \|= AS_AREA_WRITE;	-
107	if (!as_area_create(t->as, flags, pages * PAGE_SIZE, vp, AS_AREA_ATTR_NONE,	103	if (!as_area_create(t->as, flags, pages * PAGE_SIZE, vp, AS_AREA_ATTR_NONE,
108	&phys_backend, &backend_data)) {	104	&phys_backend, &backend_data)) {
109	/*	105	/*
110	* The address space area could not have been created.	106	* The address space area could not have been created.
111	* We report it using ENOMEM.	107	* We report it using ENOMEM.
112	*/	108	*/
113	spinlock_unlock(&t->lock);	109	spinlock_unlock(&t->lock);
114	interrupts_restore(ipl);	110	interrupts_restore(ipl);
115	return ENOMEM;	111	return ENOMEM;
116	}	112	}
117		113
118	/*	114	/*
119	* Mapping is created on-demand during page fault.	115	* Mapping is created on-demand during page fault.
120	*/	116	*/
121		117
122	spinlock_unlock(&t->lock);	118	spinlock_unlock(&t->lock);
123	interrupts_restore(ipl);	119	interrupts_restore(ipl);
124	return 0;	120	return 0;
125	}	121	}
126		122
127	/** Enable range of I/O space for task.	123	/** Enable range of I/O space for task.
128	*	124	*
129	* @param id Task ID of the destination task.	125	* @param id Task ID of the destination task.
130	* @param ioaddr Starting I/O address.	126	* @param ioaddr Starting I/O address.
131	* @param size Size of the enabled I/O space..	127	* @param size Size of the enabled I/O space..
132	*	128	*
133	* @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,
134	* ENOENT if there is no task matching the specified ID.	130	* ENOENT if there is no task matching the specified ID.
135	*/	131	*/
136	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)
137	{	133	{
138	ipl_t ipl;	134	ipl_t ipl;
139	cap_t caps;	135	cap_t caps;
140	task_t *t;	136	task_t *t;
141	int rc;	137	int rc;
142		138
143	/*	139	/*
144	* Make sure the caller is authorised to make this syscall.	140	* Make sure the caller is authorised to make this syscall.
145	*/	141	*/
146	caps = cap_get(TASK);	142	caps = cap_get(TASK);
147	if (!(caps & CAP_IO_MANAGER))	143	if (!(caps & CAP_IO_MANAGER))
148	return EPERM;	144	return EPERM;
149		145
150	ipl = interrupts_disable();	146	ipl = interrupts_disable();
151	spinlock_lock(&tasks_lock);	147	spinlock_lock(&tasks_lock);
152		148
153	t = task_find_by_id(id);	149	t = task_find_by_id(id);
154		150
155	if (!t) {	151	if (!t) {
156	/*	152	/*
157	* There is no task with the specified ID.	153	* There is no task with the specified ID.
158	*/	154	*/
159	spinlock_unlock(&tasks_lock);	155	spinlock_unlock(&tasks_lock);
160	interrupts_restore(ipl);	156	interrupts_restore(ipl);
161	return ENOENT;	157	return ENOENT;
162	}	158	}
163		159
164	/*	160	/*
165	* TODO: We are currently lacking support for task destroying.	161	* TODO: We are currently lacking support for task destroying.
166	* 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
167	* synchronize in a way that prevents race conditions here.	163	* synchronize in a way that prevents race conditions here.
168	*/	164	*/
169		165
170	/* Lock the task and release the lock protecting tasks_btree. */	166	/* Lock the task and release the lock protecting tasks_btree. */
171	spinlock_lock(&t->lock);	167	spinlock_lock(&t->lock);
172	spinlock_unlock(&tasks_lock);	168	spinlock_unlock(&tasks_lock);
173		169
174	rc = ddi_iospace_enable_arch(t, ioaddr, size);	170	rc = ddi_iospace_enable_arch(t, ioaddr, size);
175		171
176	spinlock_unlock(&t->lock);	172	spinlock_unlock(&t->lock);
177	interrupts_restore(ipl);	173	interrupts_restore(ipl);
178	return rc;	174	return rc;
179	}	175	}
180		176
181	/** Wrapper for SYS_MAP_PHYSMEM syscall.	177	/** Wrapper for SYS_MAP_PHYSMEM syscall.
182	*	178	*
183	* @param User space address of memory DDI argument structure.	179	* @param User space address of memory DDI argument structure.
184	*	180	*
185	* @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
186	*/	182	*/
187	__native sys_physmem_map(ddi_memarg_t *uspace_mem_arg)	183	__native sys_physmem_map(ddi_memarg_t *uspace_mem_arg)
188	{	184	{
189	ddi_memarg_t arg;	185	ddi_memarg_t arg;
190	int rc;	186	int rc;
191		187
192	rc = copy_from_uspace(&arg, uspace_mem_arg, sizeof(ddi_memarg_t));	188	rc = copy_from_uspace(&arg, uspace_mem_arg, sizeof(ddi_memarg_t));
193	if (rc != 0)	189	if (rc != 0)
194	return (__native) rc;	190	return (__native) rc;
195		191
196	return (__native) ddi_physmem_map((task_id_t) arg.task_id, ALIGN_DOWN((__address) arg.phys_base, FRAME_SIZE),	192	return (__native) ddi_physmem_map((task_id_t) arg.task_id, ALIGN_DOWN((__address) arg.phys_base, FRAME_SIZE),
197	ALIGN_DOWN((__address) arg.virt_base, PAGE_SIZE), (count_t) arg.pages,	193	ALIGN_DOWN((__address) arg.virt_base, PAGE_SIZE), (count_t) arg.pages,
198	(bool) arg.writable);	194	(int) arg.flags);
199	}	195	}
200		196
201	/** Wrapper for SYS_ENABLE_IOSPACE syscall.	197	/** Wrapper for SYS_ENABLE_IOSPACE syscall.
202	*	198	*
203	* @param User space address of DDI argument structure.	199	* @param User space address of DDI argument structure.
204	*	200	*
205	* @return 0 on success, otherwise it returns error code found in errno.h	201	* @return 0 on success, otherwise it returns error code found in errno.h
206	*/	202	*/
207	__native sys_iospace_enable(ddi_ioarg_t *uspace_io_arg)	203	__native sys_iospace_enable(ddi_ioarg_t *uspace_io_arg)
208	{	204	{
209	ddi_ioarg_t arg;	205	ddi_ioarg_t arg;
210	int rc;	206	int rc;
211		207
212	rc = copy_from_uspace(&arg, uspace_io_arg, sizeof(ddi_ioarg_t));	208	rc = copy_from_uspace(&arg, uspace_io_arg, sizeof(ddi_ioarg_t));
213	if (rc != 0)	209	if (rc != 0)
214	return (__native) rc;	210	return (__native) rc;
215		211
216	return (__native) ddi_iospace_enable((task_id_t) arg.task_id, (__address) arg.ioaddr, (size_t) arg.size);	212	return (__native) ddi_iospace_enable((task_id_t) arg.task_id, (__address) arg.ioaddr, (size_t) arg.size);
217	}	213	}
218		214
219	/** Disable or enable preemption.	215	/** Disable or enable preemption.
220	*	216	*
221	* @param enable If non-zero, the preemption counter will be decremented, leading to potential	217	* @param enable If non-zero, the preemption counter will be decremented, leading to potential
222	* enabling of preemption. Otherwise the preemption counter will be incremented,	218	* enabling of preemption. Otherwise the preemption counter will be incremented,
223	* preventing preemption from occurring.	219	* preventing preemption from occurring.
224	*	220	*
225	* @return Zero on success or EPERM if callers capabilities are not sufficient.	221	* @return Zero on success or EPERM if callers capabilities are not sufficient.
226	*/	222	*/
227	__native sys_preempt_control(int enable)	223	__native sys_preempt_control(int enable)
228	{	224	{
229	if (! cap_get(TASK) & CAP_PREEMPT_CONTROL)	225	if (! cap_get(TASK) & CAP_PREEMPT_CONTROL)
230	return EPERM;	226	return EPERM;
231	if (enable)	227	if (enable)
232	preemption_enable();	228	preemption_enable();
233	else	229	else
234	preemption_disable();	230	preemption_disable();
235	return 0;	231	return 0;
236	}	232	}
237		233

Subversion Repositories HelenOS-historic

(root)/kernel/trunk/generic/src/ddi/ddi.c @ 1780 – Rev 1425 → 1429