WebSVN – HelenOS – Diff – /branches/tracing/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.
 *
 */
void ddi_parea_register(parea_t *parea)
{
    ipl_t ipl = interrupts_disable();
    spinlock_lock(&parea_lock);
   
    /*
     * We don't check for overlaps here as the kernel is pretty sane.
     */
    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, EBADMEM if pf or vf is not page aligned, 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, size_t pages, int flags)
{
    ASSERT(TASK);
    ASSERT((pf % FRAME_SIZE) == 0);
    ASSERT((vp % PAGE_SIZE) == 0);
   
    /*
     * Make sure the caller is authorised to make this syscall.
     */
    cap_t caps = cap_get(TASK);
    if (!(caps & CAP_MEM_MANAGER))
        return EPERM;
   
    mem_backend_data_t backend_data;
    backend_data.base = pf;
    backend_data.frames = pages;
   
    ipl_t ipl = interrupts_disable();
   
    /* Find the zone of the physical memory */
    spinlock_lock(&zones.lock);
    size_t znum = find_zone(ADDR2PFN(pf), pages, 0);
   
    if (znum == (size_t) -1) {
        /* Frames not found in any zones
         * -> assume it is hardware device and allow mapping
         */
        spinlock_unlock(&zones.lock);
        goto map;
    }
   
    if (zones.info[znum].flags & ZONE_FIRMWARE) {
        /* Frames are part of firmware */
        spinlock_unlock(&zones.lock);
        goto map;
    }
   
    if (zone_flags_available(zones.info[znum].flags)) {
        /* Frames are part of physical memory, check if the memory
         * region is enabled for mapping.
         */
        spinlock_unlock(&zones.lock);
       
        spinlock_lock(&parea_lock);
        btree_node_t *nodep;
        parea_t *parea = (parea_t *) btree_search(&parea_btree,
            (btree_key_t) pf, &nodep);
       
        if ((!parea) || (parea->frames < pages))
            goto err;
       
        spinlock_unlock(&parea_lock);
        goto map;
    }
   
err:
    spinlock_unlock(&zones.lock);
    interrupts_restore(ipl);
    return ENOENT;
   
map:
    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)
{
    /*
     * Make sure the caller is authorised to make this syscall.
     */
    cap_t caps = cap_get(TASK);
    if (!(caps & CAP_IO_MANAGER))
        return EPERM;
   
    ipl_t ipl = interrupts_disable();
    spinlock_lock(&tasks_lock);
   
    task_t *task = task_find_by_id(id);
   
    if ((!task) || (!context_check(CONTEXT, task->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(&task->lock);
    spinlock_unlock(&tasks_lock);
   
    int rc = ddi_iospace_enable_arch(task, ioaddr, size);
   
    spinlock_unlock(&task->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),
        (size_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 = 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 4377	Rev 4692
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	*/	71	*/
72	void ddi_parea_register(parea_t *parea)	72	void ddi_parea_register(parea_t *parea)
73	{	73	{
74	ipl_t ipl = interrupts_disable();	74	ipl_t ipl = interrupts_disable();
75	spinlock_lock(&parea_lock);	75	spinlock_lock(&parea_lock);
76		76
77	/*	77	/*
78	* We don't check for overlaps here as the kernel is pretty sane.	78	* We don't check for overlaps here as the kernel is pretty sane.
79	*/	79	*/
80	btree_insert(&parea_btree, (btree_key_t) parea->pbase, parea, NULL);	80	btree_insert(&parea_btree, (btree_key_t) parea->pbase, parea, NULL);
81		81
82	spinlock_unlock(&parea_lock);	82	spinlock_unlock(&parea_lock);
83	interrupts_restore(ipl);	83	interrupts_restore(ipl);
84	}	84	}
85		85
86	/** Map piece of physical memory into virtual address space of current task.	86	/** Map piece of physical memory into virtual address space of current task.
87	*	87	*
88	* @param pf Physical address of the starting frame.	88	* @param pf Physical address of the starting frame.
89	* @param vp Virtual address of the starting page.	89	* @param vp Virtual address of the starting page.
90	* @param pages Number of pages to map.	90	* @param pages Number of pages to map.
91	* @param flags Address space area flags for the mapping.	91	* @param flags Address space area flags for the mapping.
92	*	92	*
93	* @return 0 on success, EPERM if the caller lacks capabilities to use this	93	* @return 0 on success, EPERM if the caller lacks capabilities to use this
94	* syscall, EBADMEM if pf or vf is not page aligned, ENOENT if there	94	* syscall, EBADMEM if pf or vf is not page aligned, ENOENT if there
95	* is no task matching the specified ID or the physical address space	95	* is no task matching the specified ID or the physical address space
96	* is not enabled for mapping and ENOMEM if there was a problem in	96	* is not enabled for mapping and ENOMEM if there was a problem in
97	* creating address space area.	97	* creating address space area.
98	*	98	*
99	*/	99	*/
100	static int ddi_physmem_map(uintptr_t pf, uintptr_t vp, count_t pages, int flags)	100	static int ddi_physmem_map(uintptr_t pf, uintptr_t vp, size_t pages, int flags)
101	{	101	{
102	ASSERT(TASK);	102	ASSERT(TASK);
103	ASSERT((pf % FRAME_SIZE) == 0);	103	ASSERT((pf % FRAME_SIZE) == 0);
104	ASSERT((vp % PAGE_SIZE) == 0);	104	ASSERT((vp % PAGE_SIZE) == 0);
105		105
106	/*	106	/*
107	* Make sure the caller is authorised to make this syscall.	107	* Make sure the caller is authorised to make this syscall.
108	*/	108	*/
109	cap_t caps = cap_get(TASK);	109	cap_t caps = cap_get(TASK);
110	if (!(caps & CAP_MEM_MANAGER))	110	if (!(caps & CAP_MEM_MANAGER))
111	return EPERM;	111	return EPERM;
112		112
113	mem_backend_data_t backend_data;	113	mem_backend_data_t backend_data;
114	backend_data.base = pf;	114	backend_data.base = pf;
115	backend_data.frames = pages;	115	backend_data.frames = pages;
116		116
117	ipl_t ipl = interrupts_disable();	117	ipl_t ipl = interrupts_disable();
118		118
119	/* Find the zone of the physical memory */	119	/* Find the zone of the physical memory */
120	spinlock_lock(&zones.lock);	120	spinlock_lock(&zones.lock);
121	count_t znum = find_zone(ADDR2PFN(pf), pages, 0);	121	size_t znum = find_zone(ADDR2PFN(pf), pages, 0);
122		122
123	if (znum == (count_t) -1) {	123	if (znum == (size_t) -1) {
124	/* Frames not found in any zones	124	/* Frames not found in any zones
125	* -> assume it is hardware device and allow mapping	125	* -> assume it is hardware device and allow mapping
126	*/	126	*/
127	spinlock_unlock(&zones.lock);	127	spinlock_unlock(&zones.lock);
128	goto map;	128	goto map;
129	}	129	}
130		130
131	if (zones.info[znum].flags & ZONE_FIRMWARE) {	131	if (zones.info[znum].flags & ZONE_FIRMWARE) {
132	/* Frames are part of firmware */	132	/* Frames are part of firmware */
133	spinlock_unlock(&zones.lock);	133	spinlock_unlock(&zones.lock);
134	goto map;	134	goto map;
135	}	135	}
136		136
137	if (zone_flags_available(zones.info[znum].flags)) {	137	if (zone_flags_available(zones.info[znum].flags)) {
138	/* Frames are part of physical memory, check if the memory	138	/* Frames are part of physical memory, check if the memory
139	* region is enabled for mapping.	139	* region is enabled for mapping.
140	*/	140	*/
141	spinlock_unlock(&zones.lock);	141	spinlock_unlock(&zones.lock);
142		142
143	spinlock_lock(&parea_lock);	143	spinlock_lock(&parea_lock);
144	btree_node_t *nodep;	144	btree_node_t *nodep;
145	parea_t parea = (parea_t ) btree_search(&parea_btree,	145	parea_t parea = (parea_t ) btree_search(&parea_btree,
146	(btree_key_t) pf, &nodep);	146	(btree_key_t) pf, &nodep);
147		147
148	if ((!parea) \|\| (parea->frames < pages))	148	if ((!parea) \|\| (parea->frames < pages))
149	goto err;	149	goto err;
150		150
151	spinlock_unlock(&parea_lock);	151	spinlock_unlock(&parea_lock);
152	goto map;	152	goto map;
153	}	153	}
154		154
155	err:	155	err:
156	spinlock_unlock(&zones.lock);	156	spinlock_unlock(&zones.lock);
157	interrupts_restore(ipl);	157	interrupts_restore(ipl);
158	return ENOENT;	158	return ENOENT;
159		159
160	map:	160	map:
161	spinlock_lock(&TASK->lock);	161	spinlock_lock(&TASK->lock);
162		162
163	if (!as_area_create(TASK->as, flags, pages * PAGE_SIZE, vp,	163	if (!as_area_create(TASK->as, flags, pages * PAGE_SIZE, vp,
164	AS_AREA_ATTR_NONE, &phys_backend, &backend_data)) {	164	AS_AREA_ATTR_NONE, &phys_backend, &backend_data)) {
165	/*	165	/*
166	* The address space area could not have been created.	166	* The address space area could not have been created.
167	* We report it using ENOMEM.	167	* We report it using ENOMEM.
168	*/	168	*/
169	spinlock_unlock(&TASK->lock);	169	spinlock_unlock(&TASK->lock);
170	interrupts_restore(ipl);	170	interrupts_restore(ipl);
171	return ENOMEM;	171	return ENOMEM;
172	}	172	}
173		173
174	/*	174	/*
175	* Mapping is created on-demand during page fault.	175	* Mapping is created on-demand during page fault.
176	*/	176	*/
177		177
178	spinlock_unlock(&TASK->lock);	178	spinlock_unlock(&TASK->lock);
179	interrupts_restore(ipl);	179	interrupts_restore(ipl);
180	return 0;	180	return 0;
181	}	181	}
182		182
183	/** Enable range of I/O space for task.	183	/** Enable range of I/O space for task.
184	*	184	*
185	* @param id Task ID of the destination task.	185	* @param id Task ID of the destination task.
186	* @param ioaddr Starting I/O address.	186	* @param ioaddr Starting I/O address.
187	* @param size Size of the enabled I/O space..	187	* @param size Size of the enabled I/O space..
188	*	188	*
189	* @return 0 on success, EPERM if the caller lacks capabilities to use this	189	* @return 0 on success, EPERM if the caller lacks capabilities to use this
190	* syscall, ENOENT if there is no task matching the specified ID.	190	* syscall, ENOENT if there is no task matching the specified ID.
191	*	191	*
192	*/	192	*/
193	static int ddi_iospace_enable(task_id_t id, uintptr_t ioaddr, size_t size)	193	static int ddi_iospace_enable(task_id_t id, uintptr_t ioaddr, size_t size)
194	{	194	{
195	/*	195	/*
196	* Make sure the caller is authorised to make this syscall.	196	* Make sure the caller is authorised to make this syscall.
197	*/	197	*/
198	cap_t caps = cap_get(TASK);	198	cap_t caps = cap_get(TASK);
199	if (!(caps & CAP_IO_MANAGER))	199	if (!(caps & CAP_IO_MANAGER))
200	return EPERM;	200	return EPERM;
201		201
202	ipl_t ipl = interrupts_disable();	202	ipl_t ipl = interrupts_disable();
203	spinlock_lock(&tasks_lock);	203	spinlock_lock(&tasks_lock);
204		204
205	task_t *task = task_find_by_id(id);	205	task_t *task = task_find_by_id(id);
206		206
207	if ((!task) \|\| (!context_check(CONTEXT, task->context))) {	207	if ((!task) \|\| (!context_check(CONTEXT, task->context))) {
208	/*	208	/*
209	* There is no task with the specified ID	209	* There is no task with the specified ID
210	* or the task belongs to a different security	210	* or the task belongs to a different security
211	* context.	211	* context.
212	*/	212	*/
213	spinlock_unlock(&tasks_lock);	213	spinlock_unlock(&tasks_lock);
214	interrupts_restore(ipl);	214	interrupts_restore(ipl);
215	return ENOENT;	215	return ENOENT;
216	}	216	}
217		217
218	/* Lock the task and release the lock protecting tasks_btree. */	218	/* Lock the task and release the lock protecting tasks_btree. */
219	spinlock_lock(&task->lock);	219	spinlock_lock(&task->lock);
220	spinlock_unlock(&tasks_lock);	220	spinlock_unlock(&tasks_lock);
221		221
222	int rc = ddi_iospace_enable_arch(task, ioaddr, size);	222	int rc = ddi_iospace_enable_arch(task, ioaddr, size);
223		223
224	spinlock_unlock(&task->lock);	224	spinlock_unlock(&task->lock);
225	interrupts_restore(ipl);	225	interrupts_restore(ipl);
226		226
227	return rc;	227	return rc;
228	}	228	}
229		229
230	/** Wrapper for SYS_PHYSMEM_MAP syscall.	230	/** Wrapper for SYS_PHYSMEM_MAP syscall.
231	*	231	*
232	* @param phys_base Physical base address to map	232	* @param phys_base Physical base address to map
233	* @param virt_base Destination virtual address	233	* @param virt_base Destination virtual address
234	* @param pages Number of pages	234	* @param pages Number of pages
235	* @param flags Flags of newly mapped pages	235	* @param flags Flags of newly mapped pages
236	*	236	*
237	* @return 0 on success, otherwise it returns error code found in errno.h	237	* @return 0 on success, otherwise it returns error code found in errno.h
238	*	238	*
239	*/	239	*/
240	unative_t sys_physmem_map(unative_t phys_base, unative_t virt_base,	240	unative_t sys_physmem_map(unative_t phys_base, unative_t virt_base,
241	unative_t pages, unative_t flags)	241	unative_t pages, unative_t flags)
242	{	242	{
243	return (unative_t) ddi_physmem_map(ALIGN_DOWN((uintptr_t) phys_base,	243	return (unative_t) ddi_physmem_map(ALIGN_DOWN((uintptr_t) phys_base,
244	FRAME_SIZE), ALIGN_DOWN((uintptr_t) virt_base, PAGE_SIZE),	244	FRAME_SIZE), ALIGN_DOWN((uintptr_t) virt_base, PAGE_SIZE),
245	(count_t) pages, (int) flags);	245	(size_t) pages, (int) flags);
246	}	246	}
247		247
248	/** Wrapper for SYS_ENABLE_IOSPACE syscall.	248	/** Wrapper for SYS_ENABLE_IOSPACE syscall.
249	*	249	*
250	* @param uspace_io_arg User space address of DDI argument structure.	250	* @param uspace_io_arg User space address of DDI argument structure.
251	*	251	*
252	* @return 0 on success, otherwise it returns error code found in errno.h	252	* @return 0 on success, otherwise it returns error code found in errno.h
253	*	253	*
254	*/	254	*/
255	unative_t sys_iospace_enable(ddi_ioarg_t *uspace_io_arg)	255	unative_t sys_iospace_enable(ddi_ioarg_t *uspace_io_arg)
256	{	256	{
257	ddi_ioarg_t arg;	257	ddi_ioarg_t arg;
258	int rc = copy_from_uspace(&arg, uspace_io_arg, sizeof(ddi_ioarg_t));	258	int rc = copy_from_uspace(&arg, uspace_io_arg, sizeof(ddi_ioarg_t));
259	if (rc != 0)	259	if (rc != 0)
260	return (unative_t) rc;	260	return (unative_t) rc;
261		261
262	return (unative_t) ddi_iospace_enable((task_id_t) arg.task_id,	262	return (unative_t) ddi_iospace_enable((task_id_t) arg.task_id,
263	(uintptr_t) arg.ioaddr, (size_t) arg.size);	263	(uintptr_t) arg.ioaddr, (size_t) arg.size);
264	}	264	}
265		265
266	/** Disable or enable preemption.	266	/** Disable or enable preemption.
267	*	267	*
268	* @param enable If non-zero, the preemption counter will be decremented,	268	* @param enable If non-zero, the preemption counter will be decremented,
269	* leading to potential enabling of preemption. Otherwise	269	* leading to potential enabling of preemption. Otherwise
270	* the preemption counter will be incremented, preventing	270	* the preemption counter will be incremented, preventing
271	* preemption from occurring.	271	* preemption from occurring.
272	*	272	*
273	* @return Zero on success or EPERM if callers capabilities are not sufficient.	273	* @return Zero on success or EPERM if callers capabilities are not sufficient.
274	*	274	*
275	*/	275	*/
276	unative_t sys_preempt_control(int enable)	276	unative_t sys_preempt_control(int enable)
277	{	277	{
278	if (!cap_get(TASK) & CAP_PREEMPT_CONTROL)	278	if (!cap_get(TASK) & CAP_PREEMPT_CONTROL)
279	return EPERM;	279	return EPERM;
280		280
281	if (enable)	281	if (enable)
282	preemption_enable();	282	preemption_enable();
283	else	283	else
284	preemption_disable();	284	preemption_disable();
285		285
286	return 0;	286	return 0;
287	}	287	}
288		288
289	/** @}	289	/** @}
290	*/	290	*/
291		291

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(root)/branches/tracing/kernel/generic/src/ddi/ddi.c – Rev 4377 → 4692