WebSVN – HelenOS – Diff – /branches/dynload/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/list.h>
#include <arch.h>
#include <align.h>
#include <errno.h>
 
/** This lock protects the parea_btree. */
SPINLOCK_INITIALIZE(parea_lock);
 
/** List with enabled physical memory areas. */
static LIST_INITIALIZE(parea_head);
 
/** Physical memory area for devices. */
static parea_t dev_area;
 
/** Initialize DDI. */
void ddi_init(void)
{
    hw_area(&dev_area.pbase, &dev_area.frames);
    ddi_parea_register(&dev_area);
}
 
/** 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.
 
     */
    link_initialize(&parea->link);
    list_append(&parea->link, &parea_head);
   
    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, pfn_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.
 
 
     */
    spinlock_lock(&parea_lock);
   
    bool fnd = false;
    link_t *cur;
   
    for (cur = parea_head.next; cur != &parea_head; cur = cur->next) {
        parea_t *parea = list_get_instance(cur, parea_t, link);
        if ((parea->pbase <= pf) && (ADDR2PFN(pf - parea->pbase) + pages <= parea->frames)) {
            fnd = true;
            break;
        }
    }
   
    spinlock_unlock(&parea_lock);
   
    if (!fnd) {
        /*
         * Physical memory area cannot be mapped.
         */
 
        interrupts_restore(ipl);
        return ENOENT;
    }
 
   
    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),
        (pfn_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 2927	Rev 4343
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/list.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	/** List with enabled physical memory areas. */
-		59	static LIST_INITIALIZE(parea_head);
-		60
-		61	/** Physical memory area for devices. */
59	static btree_t parea_btree;	62	static parea_t dev_area;
60		63
61	/** Initialize DDI. */	64	/** Initialize DDI. */
62	void ddi_init(void)	65	void ddi_init(void)
63	{	66	{
-		67	hw_area(&dev_area.pbase, &dev_area.frames);
64	btree_create(&parea_btree);	68	ddi_parea_register(&dev_area);
65	}	69	}
66		70
67	/** Enable piece of physical memory for mapping by physmem_map().	71	/** Enable piece of physical memory for mapping by physmem_map().
68	*	72	*
69	* @param parea Pointer to physical area structure.	73	* @param parea Pointer to physical area structure.
70	*	74	*
71	* @todo This function doesn't check for overlaps. It depends on the kernel to	75	* @todo This function doesn't check for overlaps. It depends on the kernel to
72	* create disjunct physical memory areas.	76	* create disjunct physical memory areas.
73	*/	77	*/
74	void ddi_parea_register(parea_t *parea)	78	void ddi_parea_register(parea_t *parea)
75	{	79	{
76	ipl_t ipl;	80	ipl_t ipl;
77		81
78	ipl = interrupts_disable();	82	ipl = interrupts_disable();
79	spinlock_lock(&parea_lock);	83	spinlock_lock(&parea_lock);
80		84
81	/*	85	/*
82	* TODO: we should really check for overlaps here.	86	* TODO: we should really check for overlaps here.
83	* However, we should be safe because the kernel is pretty sane and	87	* However, we should be safe because the kernel is pretty sane.
84	* memory of different devices doesn't overlap.	-
85	*/	88	*/
-		89	link_initialize(&parea->link);
86	btree_insert(&parea_btree, (btree_key_t) parea->pbase, parea, NULL);	90	list_append(&parea->link, &parea_head);
87		91
88	spinlock_unlock(&parea_lock);	92	spinlock_unlock(&parea_lock);
89	interrupts_restore(ipl);	93	interrupts_restore(ipl);
90	}	94	}
91		95
92	/** Map piece of physical memory into virtual address space of current task.	96	/** Map piece of physical memory into virtual address space of current task.
93	*	97	*
94	* @param pf Physical address of the starting frame.	98	* @param pf Physical address of the starting frame.
95	* @param vp Virtual address of the starting page.	99	* @param vp Virtual address of the starting page.
96	* @param pages Number of pages to map.	100	* @param pages Number of pages to map.
97	* @param flags Address space area flags for the mapping.	101	* @param flags Address space area flags for the mapping.
98	*	102	*
99	* @return 0 on success, EPERM if the caller lacks capabilities to use this	103	* @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	104	* 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	105	* physical address space is not enabled for mapping and ENOMEM if there
102	* was a problem in creating address space area.	106	* was a problem in creating address space area.
103	*/	107	*/
104	static int ddi_physmem_map(uintptr_t pf, uintptr_t vp, count_t pages, int flags)	108	static int ddi_physmem_map(uintptr_t pf, uintptr_t vp, pfn_t pages, int flags)
105	{	109	{
106	ipl_t ipl;	110	ipl_t ipl;
107	cap_t caps;	111	cap_t caps;
108	mem_backend_data_t backend_data;	112	mem_backend_data_t backend_data;
109		113
110	backend_data.base = pf;	114	backend_data.base = pf;
111	backend_data.frames = pages;	115	backend_data.frames = pages;
112		116
113	/*	117	/*
114	* Make sure the caller is authorised to make this syscall.	118	* Make sure the caller is authorised to make this syscall.
115	*/	119	*/
116	caps = cap_get(TASK);	120	caps = cap_get(TASK);
117	if (!(caps & CAP_MEM_MANAGER))	121	if (!(caps & CAP_MEM_MANAGER))
118	return EPERM;	122	return EPERM;
119		123
120	ipl = interrupts_disable();	124	ipl = interrupts_disable();
121		125
122	/*	126	/*
123	* Check if the physical memory area is enabled for mapping.	127	* Check if the physical memory area is enabled for mapping.
124	* If the architecture supports virtually indexed caches, intercept	-
125	* attempts to create an illegal address alias.	-
126	*/	128	*/
127	spinlock_lock(&parea_lock);	129	spinlock_lock(&parea_lock);
-		130
128	parea_t *parea;	131	bool fnd = false;
129	btree_node_t *nodep;	132	link_t *cur;
-		133
130	parea = (parea_t *) btree_search(&parea_btree, (btree_key_t) pf, &nodep);	134	for (cur = parea_head.next; cur != &parea_head; cur = cur->next) {
131	if (!parea \|\| parea->frames < pages \|\| ((flags & AS_AREA_CACHEABLE) &&	135	parea_t *parea = list_get_instance(cur, parea_t, link);
132	!parea->cacheable) \|\| (!(flags & AS_AREA_CACHEABLE) &&	136	if ((parea->pbase <= pf) && (ADDR2PFN(pf - parea->pbase) + pages <= parea->frames)) {
-		137	fnd = true;
-		138	break;
-		139	}
-		140	}
-		141
133	parea->cacheable)) {	142	spinlock_unlock(&parea_lock);
-		143
-		144	if (!fnd) {
134	/*	145	/*
135	* This physical memory area cannot be mapped.	146	* Physical memory area cannot be mapped.
136	*/	147	*/
137	spinlock_unlock(&parea_lock);	-
138	interrupts_restore(ipl);	148	interrupts_restore(ipl);
139	return ENOENT;	149	return ENOENT;
140	}	150	}
141	spinlock_unlock(&parea_lock);	-
142		151
143	spinlock_lock(&TASK->lock);	152	spinlock_lock(&TASK->lock);
144		153
145	if (!as_area_create(TASK->as, flags, pages * PAGE_SIZE, vp, AS_AREA_ATTR_NONE,	154	if (!as_area_create(TASK->as, flags, pages * PAGE_SIZE, vp, AS_AREA_ATTR_NONE,
146	&phys_backend, &backend_data)) {	155	&phys_backend, &backend_data)) {
147	/*	156	/*
148	* The address space area could not have been created.	157	* The address space area could not have been created.
149	* We report it using ENOMEM.	158	* We report it using ENOMEM.
150	*/	159	*/
151	spinlock_unlock(&TASK->lock);	160	spinlock_unlock(&TASK->lock);
152	interrupts_restore(ipl);	161	interrupts_restore(ipl);
153	return ENOMEM;	162	return ENOMEM;
154	}	163	}
155		164
156	/*	165	/*
157	* Mapping is created on-demand during page fault.	166	* Mapping is created on-demand during page fault.
158	*/	167	*/
159		168
160	spinlock_unlock(&TASK->lock);	169	spinlock_unlock(&TASK->lock);
161	interrupts_restore(ipl);	170	interrupts_restore(ipl);
162	return 0;	171	return 0;
163	}	172	}
164		173
165	/** Enable range of I/O space for task.	174	/** Enable range of I/O space for task.
166	*	175	*
167	* @param id Task ID of the destination task.	176	* @param id Task ID of the destination task.
168	* @param ioaddr Starting I/O address.	177	* @param ioaddr Starting I/O address.
169	* @param size Size of the enabled I/O space..	178	* @param size Size of the enabled I/O space..
170	*	179	*
171	* @return 0 on success, EPERM if the caller lacks capabilities to use this	180	* @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.	181	* syscall, ENOENT if there is no task matching the specified ID.
173	*/	182	*/
174	static int ddi_iospace_enable(task_id_t id, uintptr_t ioaddr, size_t size)	183	static int ddi_iospace_enable(task_id_t id, uintptr_t ioaddr, size_t size)
175	{	184	{
176	ipl_t ipl;	185	ipl_t ipl;
177	cap_t caps;	186	cap_t caps;
178	task_t *t;	187	task_t *t;
179	int rc;	188	int rc;
180		189
181	/*	190	/*
182	* Make sure the caller is authorised to make this syscall.	191	* Make sure the caller is authorised to make this syscall.
183	*/	192	*/
184	caps = cap_get(TASK);	193	caps = cap_get(TASK);
185	if (!(caps & CAP_IO_MANAGER))	194	if (!(caps & CAP_IO_MANAGER))
186	return EPERM;	195	return EPERM;
187		196
188	ipl = interrupts_disable();	197	ipl = interrupts_disable();
189	spinlock_lock(&tasks_lock);	198	spinlock_lock(&tasks_lock);
190		199
191	t = task_find_by_id(id);	200	t = task_find_by_id(id);
192		201
193	if ((!t) \|\| (!context_check(CONTEXT, t->context))) {	202	if ((!t) \|\| (!context_check(CONTEXT, t->context))) {
194	/*	203	/*
195	* There is no task with the specified ID	204	* There is no task with the specified ID
196	* or the task belongs to a different security	205	* or the task belongs to a different security
197	* context.	206	* context.
198	*/	207	*/
199	spinlock_unlock(&tasks_lock);	208	spinlock_unlock(&tasks_lock);
200	interrupts_restore(ipl);	209	interrupts_restore(ipl);
201	return ENOENT;	210	return ENOENT;
202	}	211	}
203		212
204	/* Lock the task and release the lock protecting tasks_btree. */	213	/* Lock the task and release the lock protecting tasks_btree. */
205	spinlock_lock(&t->lock);	214	spinlock_lock(&t->lock);
206	spinlock_unlock(&tasks_lock);	215	spinlock_unlock(&tasks_lock);
207		216
208	rc = ddi_iospace_enable_arch(t, ioaddr, size);	217	rc = ddi_iospace_enable_arch(t, ioaddr, size);
209		218
210	spinlock_unlock(&t->lock);	219	spinlock_unlock(&t->lock);
211	interrupts_restore(ipl);	220	interrupts_restore(ipl);
212	return rc;	221	return rc;
213	}	222	}
214		223
215	/** Wrapper for SYS_PHYSMEM_MAP syscall.	224	/** Wrapper for SYS_PHYSMEM_MAP syscall.
216	*	225	*
217	* @param phys_base Physical base address to map	226	* @param phys_base Physical base address to map
218	* @param virt_base Destination virtual address	227	* @param virt_base Destination virtual address
219	* @param pages Number of pages	228	* @param pages Number of pages
220	* @param flags Flags of newly mapped pages	229	* @param flags Flags of newly mapped pages
221	*	230	*
222	* @return 0 on success, otherwise it returns error code found in errno.h	231	* @return 0 on success, otherwise it returns error code found in errno.h
223	*/	232	*/
224	unative_t sys_physmem_map(unative_t phys_base, unative_t virt_base,	233	unative_t sys_physmem_map(unative_t phys_base, unative_t virt_base,
225	unative_t pages, unative_t flags)	234	unative_t pages, unative_t flags)
226	{	235	{
227	return (unative_t) ddi_physmem_map(ALIGN_DOWN((uintptr_t) phys_base,	236	return (unative_t) ddi_physmem_map(ALIGN_DOWN((uintptr_t) phys_base,
228	FRAME_SIZE), ALIGN_DOWN((uintptr_t) virt_base, PAGE_SIZE),	237	FRAME_SIZE), ALIGN_DOWN((uintptr_t) virt_base, PAGE_SIZE),
229	(count_t) pages, (int) flags);	238	(pfn_t) pages, (int) flags);
230	}	239	}
231		240
232	/** Wrapper for SYS_ENABLE_IOSPACE syscall.	241	/** Wrapper for SYS_ENABLE_IOSPACE syscall.
233	*	242	*
234	* @param uspace_io_arg User space address of DDI argument structure.	243	* @param uspace_io_arg User space address of DDI argument structure.
235	*	244	*
236	* @return 0 on success, otherwise it returns error code found in errno.h	245	* @return 0 on success, otherwise it returns error code found in errno.h
237	*/	246	*/
238	unative_t sys_iospace_enable(ddi_ioarg_t *uspace_io_arg)	247	unative_t sys_iospace_enable(ddi_ioarg_t *uspace_io_arg)
239	{	248	{
240	ddi_ioarg_t arg;	249	ddi_ioarg_t arg;
241	int rc;	250	int rc;
242		251
243	rc = copy_from_uspace(&arg, uspace_io_arg, sizeof(ddi_ioarg_t));	252	rc = copy_from_uspace(&arg, uspace_io_arg, sizeof(ddi_ioarg_t));
244	if (rc != 0)	253	if (rc != 0)
245	return (unative_t) rc;	254	return (unative_t) rc;
246		255
247	return (unative_t) ddi_iospace_enable((task_id_t) arg.task_id,	256	return (unative_t) ddi_iospace_enable((task_id_t) arg.task_id,
248	(uintptr_t) arg.ioaddr, (size_t) arg.size);	257	(uintptr_t) arg.ioaddr, (size_t) arg.size);
249	}	258	}
250		259
251	/** Disable or enable preemption.	260	/** Disable or enable preemption.
252	*	261	*
253	* @param enable If non-zero, the preemption counter will be decremented,	262	* @param enable If non-zero, the preemption counter will be decremented,
254	* leading to potential enabling of preemption. Otherwise the preemption	263	* leading to potential enabling of preemption. Otherwise the preemption
255	* counter will be incremented, preventing preemption from occurring.	264	* counter will be incremented, preventing preemption from occurring.
256	*	265	*
257	* @return Zero on success or EPERM if callers capabilities are not sufficient.	266	* @return Zero on success or EPERM if callers capabilities are not sufficient.
258	*/	267	*/
259	unative_t sys_preempt_control(int enable)	268	unative_t sys_preempt_control(int enable)
260	{	269	{
261	if (!cap_get(TASK) & CAP_PREEMPT_CONTROL)	270	if (!cap_get(TASK) & CAP_PREEMPT_CONTROL)
262	return EPERM;	271	return EPERM;
263	if (enable)	272	if (enable)
264	preemption_enable();	273	preemption_enable();
265	else	274	else
266	preemption_disable();	275	preemption_disable();
267	return 0;	276	return 0;
268	}	277	}
269		278
270	/** @}	279	/** @}
271	*/	280	*/
272		281

Subversion Repositories HelenOS

(root)/branches/dynload/kernel/generic/src/ddi/ddi.c – Rev 2927 → 4343