WebSVN – HelenOS – Diff – /branches/sparc/kernel/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 writable If true, the mapping will be created writable.
 *
 * @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, bool writable)
{
    ipl_t ipl;
    cap_t caps;
    task_t *t;
    int flags;
    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);
   
    flags = AS_AREA_READ;
    if (writable)
        flags |= AS_AREA_WRITE;
    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,
                      (bool) arg.writable);
}
 
/** 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 1424	Rev 1425
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

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(root)/branches/sparc/kernel/generic/src/ddi/ddi.c @ 3862 – Rev 1424 → 1425