WebSVN – HelenOS – Diff – /trunk/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.
 */
 
/** @addtogroup genericddi
 * @{
 */
 
/**
 * @file
 * @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 <adt/btree.h>
#include <arch.h>
#include <align.h>
#include <errno.h>
 
/** This lock protects the parea_btree. */
SPINLOCK_INITIALIZE(parea_lock);
 
/** B+tree with enabled physical memory areas. */
static btree_t parea_btree;
 
/** Initialize DDI. */
void ddi_init(void)
{
    btree_create(&parea_btree);
}
 
/** Enable piece of physical memory for mapping by physmem_map().
 *
 * @param parea Pointer to physical area structure.
 *
 * @todo This function doesn't check for overlaps. It depends on the kernel to
 * create disjunct physical memory areas.
 */
void ddi_parea_register(parea_t *parea)
{
    ipl_t ipl;
 
    ipl = interrupts_disable();
    spinlock_lock(&parea_lock);
   
    /*
     * TODO: we should really check for overlaps here.
     * However, we should be safe because the kernel is pretty sane and
     * memory of different devices doesn't overlap.
     */
    btree_insert(&parea_btree, (btree_key_t) parea->pbase, parea, NULL);
 
    spinlock_unlock(&parea_lock);
    interrupts_restore(ipl);   
}
 
/** Map piece of physical memory into virtual address space of current task.
 *
 * @param pf Physical address of the starting frame.
 * @param vp Virtual 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 or the
 *  physical address space is not enabled for mapping and ENOMEM if there
 *  was a problem in creating address space area.
 
 */
static int ddi_physmem_map(uintptr_t pf, uintptr_t vp, count_t pages, int flags)
{
    ipl_t ipl;
    cap_t caps;
    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();
 
    /*
     * Check if the physical memory area is enabled for mapping.
     * If the architecture supports virtually indexed caches, intercept
     * attempts to create an illegal address alias.
     */
    spinlock_lock(&parea_lock);
    parea_t *parea;
    btree_node_t *nodep;
    parea = (parea_t *) btree_search(&parea_btree, (btree_key_t) pf, &nodep);
    if (!parea || parea->frames < pages || ((flags & AS_AREA_CACHEABLE) &&
        !parea->cacheable) || (!(flags & AS_AREA_CACHEABLE) &&
        parea->cacheable)) {
        /*
         * This physical memory area cannot be mapped.
         */
        spinlock_unlock(&parea_lock);
        interrupts_restore(ipl);
        return ENOENT;
    }
 
 
 
 
 
 
 
 
 
 
 
 
    spinlock_unlock(&parea_lock);
 
    spinlock_lock(&TASK->lock);
   
    if (!as_area_create(TASK->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(&TASK->lock);
        interrupts_restore(ipl);
        return ENOMEM;
    }
   
    /*
     * Mapping is created on-demand during page fault.
     */
   
    spinlock_unlock(&TASK->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, uintptr_t 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) || (!context_check(CONTEXT, t->context))) {
        /*
         * There is no task with the specified ID
         * or the task belongs to a different security
         * context.
         */
        spinlock_unlock(&tasks_lock);
        interrupts_restore(ipl);
        return ENOENT;
    }
 
    /* 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_PHYSMEM_MAP syscall.
 *
 * @param phys_base Physical base address to map
 * @param virt_base Destination virtual address
 * @param pages Number of pages
 * @param flags Flags of newly mapped pages
 *
 * @return 0 on success, otherwise it returns error code found in errno.h
 */
unative_t sys_physmem_map(unative_t phys_base, unative_t virt_base,
    unative_t pages, unative_t flags)
{
    return (unative_t) ddi_physmem_map(ALIGN_DOWN((uintptr_t) phys_base,
        FRAME_SIZE), ALIGN_DOWN((uintptr_t) virt_base, PAGE_SIZE),
        (count_t) pages, (int) flags);
}
 
/** Wrapper for SYS_ENABLE_IOSPACE syscall.
 *
 * @param uspace_io_arg User space address of DDI argument structure.
 *
 * @return 0 on success, otherwise it returns error code found in errno.h
 */
unative_t 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 (unative_t) rc;
       
    return (unative_t) ddi_iospace_enable((task_id_t) arg.task_id,
        (uintptr_t) 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.
 */
unative_t sys_preempt_control(int enable)
{
        if (!cap_get(TASK) & CAP_PREEMPT_CONTROL)
                return EPERM;
        if (enable)
                preemption_enable();
        else
                preemption_disable();
        return 0;
}
 
/** @}
 */
 

Rev 2116	Rev 2141
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. ENOTSUP is returned when	102	* was a problem in creating address space area.
103	* an attempt to create an illegal address alias is detected.	-
104	*/	103	*/
105	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)
106	{	105	{
107	ipl_t ipl;	106	ipl_t ipl;
108	cap_t caps;	107	cap_t caps;
109	mem_backend_data_t backend_data;	108	mem_backend_data_t backend_data;
110		109
111	backend_data.base = pf;	110	backend_data.base = pf;
112	backend_data.frames = pages;	111	backend_data.frames = pages;
113		112
114	/*	113	/*
115	* Make sure the caller is authorised to make this syscall.	114	* Make sure the caller is authorised to make this syscall.
116	*/	115	*/
117	caps = cap_get(TASK);	116	caps = cap_get(TASK);
118	if (!(caps & CAP_MEM_MANAGER))	117	if (!(caps & CAP_MEM_MANAGER))
119	return EPERM;	118	return EPERM;
120		119
121	ipl = interrupts_disable();	120	ipl = interrupts_disable();
122		121
123	/*	122	/*
124	* Check if the physical memory area is enabled for mapping.	123	* Check if the physical memory area is enabled for mapping.
125	* If the architecture supports virtually indexed caches, intercept	124	* If the architecture supports virtually indexed caches, intercept
126	* attempts to create an illegal address alias.	125	* attempts to create an illegal address alias.
127	*/	126	*/
128	spinlock_lock(&parea_lock);	127	spinlock_lock(&parea_lock);
129	parea_t *parea;	128	parea_t *parea;
130	btree_node_t *nodep;	129	btree_node_t *nodep;
131	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);
132	if (!parea \|\| parea->frames < pages \|\| ((flags & AS_AREA_CACHEABLE) &&	131	if (!parea \|\| parea->frames < pages \|\| ((flags & AS_AREA_CACHEABLE) &&
133	!parea->cacheable) \|\| (!(flags & AS_AREA_CACHEABLE) &&	132	!parea->cacheable) \|\| (!(flags & AS_AREA_CACHEABLE) &&
134	parea->cacheable)) {	133	parea->cacheable)) {
135	/*	134	/*
136	* This physical memory area cannot be mapped.	135	* This physical memory area cannot be mapped.
137	*/	136	*/
138	spinlock_unlock(&parea_lock);	137	spinlock_unlock(&parea_lock);
139	interrupts_restore(ipl);	138	interrupts_restore(ipl);
140	return ENOENT;	139	return ENOENT;
141	}	140	}
142		-
143	#ifdef CONFIG_VIRT_IDX_DCACHE	-
144	if (PAGE_COLOR(parea->vbase) != PAGE_COLOR(vp)) {	-
145	/*	-
146	* Refuse to create an illegal address alias.	-
147	*/	-
148	spinlock_unlock(&parea_lock);	-
149	interrupts_restore(ipl);	-
150	return ENOTSUP;	-
151	}	-
152	#endif /* CONFIG_VIRT_IDX_DCACHE */	-
153		-
154	spinlock_unlock(&parea_lock);	141	spinlock_unlock(&parea_lock);
155		142
156	spinlock_lock(&TASK->lock);	143	spinlock_lock(&TASK->lock);
157		144
158	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,
159	&phys_backend, &backend_data)) {	146	&phys_backend, &backend_data)) {
160	/*	147	/*
161	* The address space area could not have been created.	148	* The address space area could not have been created.
162	* We report it using ENOMEM.	149	* We report it using ENOMEM.
163	*/	150	*/
164	spinlock_unlock(&TASK->lock);	151	spinlock_unlock(&TASK->lock);
165	interrupts_restore(ipl);	152	interrupts_restore(ipl);
166	return ENOMEM;	153	return ENOMEM;
167	}	154	}
168		155
169	/*	156	/*
170	* Mapping is created on-demand during page fault.	157	* Mapping is created on-demand during page fault.
171	*/	158	*/
172		159
173	spinlock_unlock(&TASK->lock);	160	spinlock_unlock(&TASK->lock);
174	interrupts_restore(ipl);	161	interrupts_restore(ipl);
175	return 0;	162	return 0;
176	}	163	}
177		164
178	/** Enable range of I/O space for task.	165	/** Enable range of I/O space for task.
179	*	166	*
180	* @param id Task ID of the destination task.	167	* @param id Task ID of the destination task.
181	* @param ioaddr Starting I/O address.	168	* @param ioaddr Starting I/O address.
182	* @param size Size of the enabled I/O space..	169	* @param size Size of the enabled I/O space..
183	*	170	*
184	* @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
185	* syscall, ENOENT if there is no task matching the specified ID.	172	* syscall, ENOENT if there is no task matching the specified ID.
186	*/	173	*/
187	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)
188	{	175	{
189	ipl_t ipl;	176	ipl_t ipl;
190	cap_t caps;	177	cap_t caps;
191	task_t *t;	178	task_t *t;
192	int rc;	179	int rc;
193		180
194	/*	181	/*
195	* Make sure the caller is authorised to make this syscall.	182	* Make sure the caller is authorised to make this syscall.
196	*/	183	*/
197	caps = cap_get(TASK);	184	caps = cap_get(TASK);
198	if (!(caps & CAP_IO_MANAGER))	185	if (!(caps & CAP_IO_MANAGER))
199	return EPERM;	186	return EPERM;
200		187
201	ipl = interrupts_disable();	188	ipl = interrupts_disable();
202	spinlock_lock(&tasks_lock);	189	spinlock_lock(&tasks_lock);
203		190
204	t = task_find_by_id(id);	191	t = task_find_by_id(id);
205		192
206	if ((!t) \|\| (!context_check(CONTEXT, t->context))) {	193	if ((!t) \|\| (!context_check(CONTEXT, t->context))) {
207	/*	194	/*
208	* There is no task with the specified ID	195	* There is no task with the specified ID
209	* or the task belongs to a different security	196	* or the task belongs to a different security
210	* context.	197	* context.
211	*/	198	*/
212	spinlock_unlock(&tasks_lock);	199	spinlock_unlock(&tasks_lock);
213	interrupts_restore(ipl);	200	interrupts_restore(ipl);
214	return ENOENT;	201	return ENOENT;
215	}	202	}
216		203
217	/* Lock the task and release the lock protecting tasks_btree. */	204	/* Lock the task and release the lock protecting tasks_btree. */
218	spinlock_lock(&t->lock);	205	spinlock_lock(&t->lock);
219	spinlock_unlock(&tasks_lock);	206	spinlock_unlock(&tasks_lock);
220		207
221	rc = ddi_iospace_enable_arch(t, ioaddr, size);	208	rc = ddi_iospace_enable_arch(t, ioaddr, size);
222		209
223	spinlock_unlock(&t->lock);	210	spinlock_unlock(&t->lock);
224	interrupts_restore(ipl);	211	interrupts_restore(ipl);
225	return rc;	212	return rc;
226	}	213	}
227		214
228	/** Wrapper for SYS_PHYSMEM_MAP syscall.	215	/** Wrapper for SYS_PHYSMEM_MAP syscall.
229	*	216	*
230	* @param phys_base Physical base address to map	217	* @param phys_base Physical base address to map
231	* @param virt_base Destination virtual address	218	* @param virt_base Destination virtual address
232	* @param pages Number of pages	219	* @param pages Number of pages
233	* @param flags Flags of newly mapped pages	220	* @param flags Flags of newly mapped pages
234	*	221	*
235	* @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
236	*/	223	*/
237	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,
238	unative_t pages, unative_t flags)	225	unative_t pages, unative_t flags)
239	{	226	{
240	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,
241	FRAME_SIZE), ALIGN_DOWN((uintptr_t) virt_base, PAGE_SIZE),	228	FRAME_SIZE), ALIGN_DOWN((uintptr_t) virt_base, PAGE_SIZE),
242	(count_t) pages, (int) flags);	229	(count_t) pages, (int) flags);
243	}	230	}
244		231
245	/** Wrapper for SYS_ENABLE_IOSPACE syscall.	232	/** Wrapper for SYS_ENABLE_IOSPACE syscall.
246	*	233	*
247	* @param uspace_io_arg User space address of DDI argument structure.	234	* @param uspace_io_arg User space address of DDI argument structure.
248	*	235	*
249	* @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
250	*/	237	*/
251	unative_t sys_iospace_enable(ddi_ioarg_t *uspace_io_arg)	238	unative_t sys_iospace_enable(ddi_ioarg_t *uspace_io_arg)
252	{	239	{
253	ddi_ioarg_t arg;	240	ddi_ioarg_t arg;
254	int rc;	241	int rc;
255		242
256	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));
257	if (rc != 0)	244	if (rc != 0)
258	return (unative_t) rc;	245	return (unative_t) rc;
259		246
260	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,
261	(uintptr_t) arg.ioaddr, (size_t) arg.size);	248	(uintptr_t) arg.ioaddr, (size_t) arg.size);
262	}	249	}
263		250
264	/** Disable or enable preemption.	251	/** Disable or enable preemption.
265	*	252	*
266	* @param enable If non-zero, the preemption counter will be decremented,	253	* @param enable If non-zero, the preemption counter will be decremented,
267	* leading to potential enabling of preemption. Otherwise the preemption	254	* leading to potential enabling of preemption. Otherwise the preemption
268	* counter will be incremented, preventing preemption from occurring.	255	* counter will be incremented, preventing preemption from occurring.
269	*	256	*
270	* @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.
271	*/	258	*/
272	unative_t sys_preempt_control(int enable)	259	unative_t sys_preempt_control(int enable)
273	{	260	{
274	if (!cap_get(TASK) & CAP_PREEMPT_CONTROL)	261	if (!cap_get(TASK) & CAP_PREEMPT_CONTROL)
275	return EPERM;	262	return EPERM;
276	if (enable)	263	if (enable)
277	preemption_enable();	264	preemption_enable();
278	else	265	else
279	preemption_disable();	266	preemption_disable();
280	return 0;	267	return 0;
281	}	268	}
282		269
283	/** @}	270	/** @}
284	*/	271	*/
285		272

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(root)/trunk/kernel/generic/src/ddi/ddi.c – Rev 2116 → 2141