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


/*
 * Copyright (C) 2006 Jakub Jermar
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 * - The name of the author may not be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
 
 
 
 
 
 
 
 /** @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 <arch.h>
#include <align.h>
#include <errno.h>
 
/** Map piece of physical memory into virtual address space of current task.
 *
 * @param pf Physical frame address of the starting frame.
 * @param vp Virtual page address of the starting page.
 * @param pages Number of pages to map.
 * @param flags Address space area flags for the mapping.
 *
 * @return 0 on success, EPERM if the caller lacks capabilities to use this syscall,
 *     ENOENT if there is no task matching the specified ID and ENOMEM if
 *     there was a problem in creating address space area.
 */
static int ddi_physmem_map(__address pf, __address 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();
    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, __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;
    }
 
    /* 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 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
 */
__native sys_physmem_map(__native phys_base, __native virt_base, __native pages,
             __native flags)
{
    return (__native) ddi_physmem_map(ALIGN_DOWN((__address) phys_base, FRAME_SIZE),
                      ALIGN_DOWN((__address) virt_base, PAGE_SIZE), (count_t) pages,
                      (int) flags);
}
 
/** Wrapper for SYS_ENABLE_IOSPACE syscall.
 *
 * @param User space address of DDI argument structure.
 *
 * @return 0 on success, otherwise it returns error code found in errno.h
 */
__native sys_iospace_enable(ddi_ioarg_t *uspace_io_arg)
{
    ddi_ioarg_t arg;
    int rc;
   
    rc = copy_from_uspace(&arg, uspace_io_arg, sizeof(ddi_ioarg_t));
    if (rc != 0)
        return (__native) rc;
       
    return (__native) ddi_iospace_enable((task_id_t) arg.task_id, (__address) arg.ioaddr, (size_t) arg.size);
}
 
/** Disable or enable preemption.
 *
 * @param enable If non-zero, the preemption counter will be decremented, leading to potential
 *       enabling of preemption. Otherwise the preemption counter will be incremented,
 *       preventing preemption from occurring.
 *
 * @return Zero on success or EPERM if callers capabilities are not sufficient.
 */
__native sys_preempt_control(int enable)
{
        if (! cap_get(TASK) & CAP_PREEMPT_CONTROL)
                return EPERM;
        if (enable)
                preemption_enable();
        else
                preemption_disable();
        return 0;
}
 
 /** @}
 */
 
 

Rev 1702	Rev 1705
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	/** @defgroup ddi Device Driver Interface	-
30	* @ingroup kernel	-
31	* @{	-
32	* @}	-
33	*/	-
34		-
35	/** @addtogroup genericddi generic	29	/** @addtogroup genericddi
36	* @ingroup ddi	-
37	* @{	30	* @{
38	*/	31	*/
39		32
40	/**	33	/**
41	* @file	34	* @file
42	* @brief Device Driver Interface functions.	35	* @brief Device Driver Interface functions.
43	*	36	*
44	* This file contains functions that comprise the Device Driver Interface.	37	* This file contains functions that comprise the Device Driver Interface.
45	* 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
46	* space to tasks.	39	* space to tasks.
47	*/	40	*/
48		41
49	#include <ddi/ddi.h>	42	#include <ddi/ddi.h>
50	#include <ddi/ddi_arg.h>	43	#include <ddi/ddi_arg.h>
51	#include <proc/task.h>	44	#include <proc/task.h>
52	#include <security/cap.h>	45	#include <security/cap.h>
53	#include <mm/frame.h>	46	#include <mm/frame.h>
54	#include <mm/as.h>	47	#include <mm/as.h>
55	#include <synch/spinlock.h>	48	#include <synch/spinlock.h>
56	#include <syscall/copy.h>	49	#include <syscall/copy.h>
57	#include <arch.h>	50	#include <arch.h>
58	#include <align.h>	51	#include <align.h>
59	#include <errno.h>	52	#include <errno.h>
60		53
61	/** Map piece of physical memory into virtual address space of current task.	54	/** Map piece of physical memory into virtual address space of current task.
62	*	55	*
63	* @param pf Physical frame address of the starting frame.	56	* @param pf Physical frame address of the starting frame.
64	* @param vp Virtual page address of the starting page.	57	* @param vp Virtual page address of the starting page.
65	* @param pages Number of pages to map.	58	* @param pages Number of pages to map.
66	* @param flags Address space area flags for the mapping.	59	* @param flags Address space area flags for the mapping.
67	*	60	*
68	* @return 0 on success, EPERM if the caller lacks capabilities to use this syscall,	61	* @return 0 on success, EPERM if the caller lacks capabilities to use this syscall,
69	* ENOENT if there is no task matching the specified ID and ENOMEM if	62	* ENOENT if there is no task matching the specified ID and ENOMEM if
70	* there was a problem in creating address space area.	63	* there was a problem in creating address space area.
71	*/	64	*/
72	static int ddi_physmem_map(__address pf, __address vp, count_t pages, int flags)	65	static int ddi_physmem_map(__address pf, __address vp, count_t pages, int flags)
73	{	66	{
74	ipl_t ipl;	67	ipl_t ipl;
75	cap_t caps;	68	cap_t caps;
76	mem_backend_data_t backend_data;	69	mem_backend_data_t backend_data;
77		70
78	backend_data.base = pf;	71	backend_data.base = pf;
79	backend_data.frames = pages;	72	backend_data.frames = pages;
80		73
81	/*	74	/*
82	* Make sure the caller is authorised to make this syscall.	75	* Make sure the caller is authorised to make this syscall.
83	*/	76	*/
84	caps = cap_get(TASK);	77	caps = cap_get(TASK);
85	if (!(caps & CAP_MEM_MANAGER))	78	if (!(caps & CAP_MEM_MANAGER))
86	return EPERM;	79	return EPERM;
87		80
88	ipl = interrupts_disable();	81	ipl = interrupts_disable();
89	spinlock_lock(&TASK->lock);	82	spinlock_lock(&TASK->lock);
90		83
91	if (!as_area_create(TASK->as, flags, pages * PAGE_SIZE, vp, AS_AREA_ATTR_NONE,	84	if (!as_area_create(TASK->as, flags, pages * PAGE_SIZE, vp, AS_AREA_ATTR_NONE,
92	&phys_backend, &backend_data)) {	85	&phys_backend, &backend_data)) {
93	/*	86	/*
94	* The address space area could not have been created.	87	* The address space area could not have been created.
95	* We report it using ENOMEM.	88	* We report it using ENOMEM.
96	*/	89	*/
97	spinlock_unlock(&TASK->lock);	90	spinlock_unlock(&TASK->lock);
98	interrupts_restore(ipl);	91	interrupts_restore(ipl);
99	return ENOMEM;	92	return ENOMEM;
100	}	93	}
101		94
102	/*	95	/*
103	* Mapping is created on-demand during page fault.	96	* Mapping is created on-demand during page fault.
104	*/	97	*/
105		98
106	spinlock_unlock(&TASK->lock);	99	spinlock_unlock(&TASK->lock);
107	interrupts_restore(ipl);	100	interrupts_restore(ipl);
108	return 0;	101	return 0;
109	}	102	}
110		103
111	/** Enable range of I/O space for task.	104	/** Enable range of I/O space for task.
112	*	105	*
113	* @param id Task ID of the destination task.	106	* @param id Task ID of the destination task.
114	* @param ioaddr Starting I/O address.	107	* @param ioaddr Starting I/O address.
115	* @param size Size of the enabled I/O space..	108	* @param size Size of the enabled I/O space..
116	*	109	*
117	* @return 0 on success, EPERM if the caller lacks capabilities to use this syscall,	110	* @return 0 on success, EPERM if the caller lacks capabilities to use this syscall,
118	* ENOENT if there is no task matching the specified ID.	111	* ENOENT if there is no task matching the specified ID.
119	*/	112	*/
120	static int ddi_iospace_enable(task_id_t id, __address ioaddr, size_t size)	113	static int ddi_iospace_enable(task_id_t id, __address ioaddr, size_t size)
121	{	114	{
122	ipl_t ipl;	115	ipl_t ipl;
123	cap_t caps;	116	cap_t caps;
124	task_t *t;	117	task_t *t;
125	int rc;	118	int rc;
126		119
127	/*	120	/*
128	* Make sure the caller is authorised to make this syscall.	121	* Make sure the caller is authorised to make this syscall.
129	*/	122	*/
130	caps = cap_get(TASK);	123	caps = cap_get(TASK);
131	if (!(caps & CAP_IO_MANAGER))	124	if (!(caps & CAP_IO_MANAGER))
132	return EPERM;	125	return EPERM;
133		126
134	ipl = interrupts_disable();	127	ipl = interrupts_disable();
135	spinlock_lock(&tasks_lock);	128	spinlock_lock(&tasks_lock);
136		129
137	t = task_find_by_id(id);	130	t = task_find_by_id(id);
138		131
139	if (!t) {	132	if (!t) {
140	/*	133	/*
141	* There is no task with the specified ID.	134	* There is no task with the specified ID.
142	*/	135	*/
143	spinlock_unlock(&tasks_lock);	136	spinlock_unlock(&tasks_lock);
144	interrupts_restore(ipl);	137	interrupts_restore(ipl);
145	return ENOENT;	138	return ENOENT;
146	}	139	}
147		140
148	/* Lock the task and release the lock protecting tasks_btree. */	141	/* Lock the task and release the lock protecting tasks_btree. */
149	spinlock_lock(&t->lock);	142	spinlock_lock(&t->lock);
150	spinlock_unlock(&tasks_lock);	143	spinlock_unlock(&tasks_lock);
151		144
152	rc = ddi_iospace_enable_arch(t, ioaddr, size);	145	rc = ddi_iospace_enable_arch(t, ioaddr, size);
153		146
154	spinlock_unlock(&t->lock);	147	spinlock_unlock(&t->lock);
155	interrupts_restore(ipl);	148	interrupts_restore(ipl);
156	return rc;	149	return rc;
157	}	150	}
158		151
159	/** Wrapper for SYS_MAP_PHYSMEM syscall.	152	/** Wrapper for SYS_MAP_PHYSMEM syscall.
160	*	153	*
161	* @param phys_base Physical base address to map	154	* @param phys_base Physical base address to map
162	* @param virt_base Destination virtual address	155	* @param virt_base Destination virtual address
163	* @param pages Number of pages	156	* @param pages Number of pages
164	* @param flags Flags of newly mapped pages	157	* @param flags Flags of newly mapped pages
165	*	158	*
166	* @return 0 on success, otherwise it returns error code found in errno.h	159	* @return 0 on success, otherwise it returns error code found in errno.h
167	*/	160	*/
168	__native sys_physmem_map(__native phys_base, __native virt_base, __native pages,	161	__native sys_physmem_map(__native phys_base, __native virt_base, __native pages,
169	__native flags)	162	__native flags)
170	{	163	{
171	return (__native) ddi_physmem_map(ALIGN_DOWN((__address) phys_base, FRAME_SIZE),	164	return (__native) ddi_physmem_map(ALIGN_DOWN((__address) phys_base, FRAME_SIZE),
172	ALIGN_DOWN((__address) virt_base, PAGE_SIZE), (count_t) pages,	165	ALIGN_DOWN((__address) virt_base, PAGE_SIZE), (count_t) pages,
173	(int) flags);	166	(int) flags);
174	}	167	}
175		168
176	/** Wrapper for SYS_ENABLE_IOSPACE syscall.	169	/** Wrapper for SYS_ENABLE_IOSPACE syscall.
177	*	170	*
178	* @param User space address of DDI argument structure.	171	* @param User space address of DDI argument structure.
179	*	172	*
180	* @return 0 on success, otherwise it returns error code found in errno.h	173	* @return 0 on success, otherwise it returns error code found in errno.h
181	*/	174	*/
182	__native sys_iospace_enable(ddi_ioarg_t *uspace_io_arg)	175	__native sys_iospace_enable(ddi_ioarg_t *uspace_io_arg)
183	{	176	{
184	ddi_ioarg_t arg;	177	ddi_ioarg_t arg;
185	int rc;	178	int rc;
186		179
187	rc = copy_from_uspace(&arg, uspace_io_arg, sizeof(ddi_ioarg_t));	180	rc = copy_from_uspace(&arg, uspace_io_arg, sizeof(ddi_ioarg_t));
188	if (rc != 0)	181	if (rc != 0)
189	return (__native) rc;	182	return (__native) rc;
190		183
191	return (__native) ddi_iospace_enable((task_id_t) arg.task_id, (__address) arg.ioaddr, (size_t) arg.size);	184	return (__native) ddi_iospace_enable((task_id_t) arg.task_id, (__address) arg.ioaddr, (size_t) arg.size);
192	}	185	}
193		186
194	/** Disable or enable preemption.	187	/** Disable or enable preemption.
195	*	188	*
196	* @param enable If non-zero, the preemption counter will be decremented, leading to potential	189	* @param enable If non-zero, the preemption counter will be decremented, leading to potential
197	* enabling of preemption. Otherwise the preemption counter will be incremented,	190	* enabling of preemption. Otherwise the preemption counter will be incremented,
198	* preventing preemption from occurring.	191	* preventing preemption from occurring.
199	*	192	*
200	* @return Zero on success or EPERM if callers capabilities are not sufficient.	193	* @return Zero on success or EPERM if callers capabilities are not sufficient.
201	*/	194	*/
202	__native sys_preempt_control(int enable)	195	__native sys_preempt_control(int enable)
203	{	196	{
204	if (! cap_get(TASK) & CAP_PREEMPT_CONTROL)	197	if (! cap_get(TASK) & CAP_PREEMPT_CONTROL)
205	return EPERM;	198	return EPERM;
206	if (enable)	199	if (enable)
207	preemption_enable();	200	preemption_enable();
208	else	201	else
209	preemption_disable();	202	preemption_disable();
210	return 0;	203	return 0;
211	}	204	}
212		205
213	/** @}	206	/** @}
214	*/	207	*/
215		208
216		209

Subversion Repositories HelenOS-historic

(root)/kernel/trunk/generic/src/ddi/ddi.c – Rev 1702 → 1705