WebSVN – HelenOS – Diff – /tags/0.2.0.1/kernel/generic/src/ddi/ddi.c


/*
 * Copyright (C) 2006 Jakub Jermar
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 * - The name of the author may not be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
 
/**
 * @file    ddi.c
 * @brief   Device Driver Interface functions.
 *
 * This file contains functions that comprise the Device Driver Interface.
 * These are the functions for mapping physical memory and enabling I/O
 * space to tasks.
 */
 
#include <ddi/ddi.h>
#include <ddi/ddi_arg.h>
#include <proc/task.h>
#include <security/cap.h>
#include <mm/frame.h>
#include <mm/as.h>
#include <synch/spinlock.h>
#include <syscall/copy.h>
#include <arch.h>
#include <align.h>
#include <errno.h>
 
/** Map piece of physical memory into virtual address space of 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 1965	Rev 1968
1	/*	1	/*
2	* Copyright (C) 2006 Jakub Jermar	2	* Copyright (C) 2006 Jakub Jermar
3	* All rights reserved.	3	* All rights reserved.
4	*	4	*
5	* Redistribution and use in source and binary forms, with or without	5	* Redistribution and use in source and binary forms, with or without
6	* modification, are permitted provided that the following conditions	6	* modification, are permitted provided that the following conditions
7	* are met:	7	* are met:
8	*	8	*
9	* - Redistributions of source code must retain the above copyright	9	* - Redistributions of source code must retain the above copyright
10	* notice, this list of conditions and the following disclaimer.	10	* notice, this list of conditions and the following disclaimer.
11	* - Redistributions in binary form must reproduce the above copyright	11	* - Redistributions in binary form must reproduce the above copyright
12	* notice, this list of conditions and the following disclaimer in the	12	* notice, this list of conditions and the following disclaimer in the
13	* documentation and/or other materials provided with the distribution.	13	* documentation and/or other materials provided with the distribution.
14	* - The name of the author may not be used to endorse or promote products	14	* - The name of the author may not be used to endorse or promote products
15	* derived from this software without specific prior written permission.	15	* derived from this software without specific prior written permission.
16	*	16	*
17	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR	17	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18	* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES	18	* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19	* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.	19	* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20	* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,	20	* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21	* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT	21	* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22	* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,	22	* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY	23	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT	24	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF	25	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26	* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.	26	* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27	*/	27	*/
28		28
29	/**	29	/**
30	* @file ddi.c	30	* @file ddi.c
31	* @brief Device Driver Interface functions.	31	* @brief Device Driver Interface functions.
32	*	32	*
33	* This file contains functions that comprise the Device Driver Interface.	33	* This file contains functions that comprise the Device Driver Interface.
34	* These are the functions for mapping physical memory and enabling I/O	34	* These are the functions for mapping physical memory and enabling I/O
35	* space to tasks.	35	* space to tasks.
36	*/	36	*/
37		37
38	#include <ddi/ddi.h>	38	#include <ddi/ddi.h>
39	#include <ddi/ddi_arg.h>	39	#include <ddi/ddi_arg.h>
40	#include <proc/task.h>	40	#include <proc/task.h>
41	#include <security/cap.h>	41	#include <security/cap.h>
42	#include <mm/frame.h>	42	#include <mm/frame.h>
43	#include <mm/as.h>	43	#include <mm/as.h>
44	#include <synch/spinlock.h>	44	#include <synch/spinlock.h>
45	#include <syscall/copy.h>	45	#include <syscall/copy.h>
46	#include <arch.h>	46	#include <arch.h>
47	#include <align.h>	47	#include <align.h>
48	#include <errno.h>	48	#include <errno.h>
49		49
50	/** Map piece of physical memory into virtual address space of current task.	50	/** Map piece of physical memory into virtual address space of current task.
51	*	51	*
52	* @param pf Physical frame address of the starting frame.	52	* @param pf Physical frame address of the starting frame.
53	* @param vp Virtual page address of the starting page.	53	* @param vp Virtual page address of the starting page.
54	* @param pages Number of pages to map.	54	* @param pages Number of pages to map.
55	* @param flags Address space area flags for the mapping.	55	* @param flags Address space area flags for the mapping.
56	*	56	*
57	* @return 0 on success, EPERM if the caller lacks capabilities to use this syscall,	57	* @return 0 on success, EPERM if the caller lacks capabilities to use this syscall,
58	* ENOENT if there is no task matching the specified ID and ENOMEM if	58	* ENOENT if there is no task matching the specified ID and ENOMEM if
59	* there was a problem in creating address space area.	59	* there was a problem in creating address space area.
60	*/	60	*/
61	static int ddi_physmem_map(__address pf, __address vp, count_t pages, int flags)	61	static int ddi_physmem_map(__address pf, __address vp, count_t pages, int flags)
62	{	62	{
63	ipl_t ipl;	63	ipl_t ipl;
64	cap_t caps;	64	cap_t caps;
65	mem_backend_data_t backend_data;	65	mem_backend_data_t backend_data;
66		66
67	backend_data.base = pf;	67	backend_data.base = pf;
68	backend_data.frames = pages;	68	backend_data.frames = pages;
69		69
70	/*	70	/*
71	* Make sure the caller is authorised to make this syscall.	71	* Make sure the caller is authorised to make this syscall.
72	*/	72	*/
73	caps = cap_get(TASK);	73	caps = cap_get(TASK);
74	if (!(caps & CAP_MEM_MANAGER))	74	if (!(caps & CAP_MEM_MANAGER))
75	return EPERM;	75	return EPERM;
76		76
77	ipl = interrupts_disable();	77	ipl = interrupts_disable();
78	spinlock_lock(&TASK->lock);	78	spinlock_lock(&TASK->lock);
79		79
80	if (!as_area_create(TASK->as, flags, pages * PAGE_SIZE, vp, AS_AREA_ATTR_NONE,	80	if (!as_area_create(TASK->as, flags, pages * PAGE_SIZE, vp, AS_AREA_ATTR_NONE,
81	&phys_backend, &backend_data)) {	81	&phys_backend, &backend_data)) {
82	/*	82	/*
83	* The address space area could not have been created.	83	* The address space area could not have been created.
84	* We report it using ENOMEM.	84	* We report it using ENOMEM.
85	*/	85	*/
86	spinlock_unlock(&TASK->lock);	86	spinlock_unlock(&TASK->lock);
87	interrupts_restore(ipl);	87	interrupts_restore(ipl);
88	return ENOMEM;	88	return ENOMEM;
89	}	89	}
90		90
91	/*	91	/*
92	* Mapping is created on-demand during page fault.	92	* Mapping is created on-demand during page fault.
93	*/	93	*/
94		94
95	spinlock_unlock(&TASK->lock);	95	spinlock_unlock(&TASK->lock);
96	interrupts_restore(ipl);	96	interrupts_restore(ipl);
97	return 0;	97	return 0;
98	}	98	}
99		99
100	/** Enable range of I/O space for task.	100	/** Enable range of I/O space for task.
101	*	101	*
102	* @param id Task ID of the destination task.	102	* @param id Task ID of the destination task.
103	* @param ioaddr Starting I/O address.	103	* @param ioaddr Starting I/O address.
104	* @param size Size of the enabled I/O space..	104	* @param size Size of the enabled I/O space..
105	*	105	*
106	* @return 0 on success, EPERM if the caller lacks capabilities to use this syscall,	106	* @return 0 on success, EPERM if the caller lacks capabilities to use this syscall,
107	* ENOENT if there is no task matching the specified ID.	107	* ENOENT if there is no task matching the specified ID.
108	*/	108	*/
109	static int ddi_iospace_enable(task_id_t id, __address ioaddr, size_t size)	109	static int ddi_iospace_enable(task_id_t id, __address ioaddr, size_t size)
110	{	110	{
111	ipl_t ipl;	111	ipl_t ipl;
112	cap_t caps;	112	cap_t caps;
113	task_t *t;	113	task_t *t;
114	int rc;	114	int rc;
115		115
116	/*	116	/*
117	* Make sure the caller is authorised to make this syscall.	117	* Make sure the caller is authorised to make this syscall.
118	*/	118	*/
119	caps = cap_get(TASK);	119	caps = cap_get(TASK);
120	if (!(caps & CAP_IO_MANAGER))	120	if (!(caps & CAP_IO_MANAGER))
121	return EPERM;	121	return EPERM;
122		122
123	ipl = interrupts_disable();	123	ipl = interrupts_disable();
124	spinlock_lock(&tasks_lock);	124	spinlock_lock(&tasks_lock);
125		125
126	t = task_find_by_id(id);	126	t = task_find_by_id(id);
127		127
128	if (!t) {	128	if (!t) {
129	/*	129	/*
130	* There is no task with the specified ID.	130	* There is no task with the specified ID.
131	*/	131	*/
132	spinlock_unlock(&tasks_lock);	132	spinlock_unlock(&tasks_lock);
133	interrupts_restore(ipl);	133	interrupts_restore(ipl);
134	return ENOENT;	134	return ENOENT;
135	}	135	}
136		136
137	/* Lock the task and release the lock protecting tasks_btree. */	137	/* Lock the task and release the lock protecting tasks_btree. */
138	spinlock_lock(&t->lock);	138	spinlock_lock(&t->lock);
139	spinlock_unlock(&tasks_lock);	139	spinlock_unlock(&tasks_lock);
140		140
141	rc = ddi_iospace_enable_arch(t, ioaddr, size);	141	rc = ddi_iospace_enable_arch(t, ioaddr, size);
142		142
143	spinlock_unlock(&t->lock);	143	spinlock_unlock(&t->lock);
144	interrupts_restore(ipl);	144	interrupts_restore(ipl);
145	return rc;	145	return rc;
146	}	146	}
147		147
148	/** Wrapper for SYS_MAP_PHYSMEM syscall.	148	/** Wrapper for SYS_MAP_PHYSMEM syscall.
149	*	149	*
150	* @param phys_base Physical base address to map	150	* @param phys_base Physical base address to map
151	* @param virt_base Destination virtual address	151	* @param virt_base Destination virtual address
152	* @param pages Number of pages	152	* @param pages Number of pages
153	* @param flags Flags of newly mapped pages	153	* @param flags Flags of newly mapped pages
154	*	154	*
155	* @return 0 on success, otherwise it returns error code found in errno.h	155	* @return 0 on success, otherwise it returns error code found in errno.h
156	*/	156	*/
157	__native sys_physmem_map(__native phys_base, __native virt_base, __native pages,	157	__native sys_physmem_map(__native phys_base, __native virt_base, __native pages,
158	__native flags)	158	__native flags)
159	{	159	{
160	return (__native) ddi_physmem_map(ALIGN_DOWN((__address) phys_base, FRAME_SIZE),	160	return (__native) ddi_physmem_map(ALIGN_DOWN((__address) phys_base, FRAME_SIZE),
161	ALIGN_DOWN((__address) virt_base, PAGE_SIZE), (count_t) pages,	161	ALIGN_DOWN((__address) virt_base, PAGE_SIZE), (count_t) pages,
162	(int) flags);	162	(int) flags);
163	}	163	}
164		164
165	/** Wrapper for SYS_ENABLE_IOSPACE syscall.	165	/** Wrapper for SYS_ENABLE_IOSPACE syscall.
166	*	166	*
167	* @param User space address of DDI argument structure.	167	* @param User space address of DDI argument structure.
168	*	168	*
169	* @return 0 on success, otherwise it returns error code found in errno.h	169	* @return 0 on success, otherwise it returns error code found in errno.h
170	*/	170	*/
171	__native sys_iospace_enable(ddi_ioarg_t *uspace_io_arg)	171	__native sys_iospace_enable(ddi_ioarg_t *uspace_io_arg)
172	{	172	{
173	ddi_ioarg_t arg;	173	ddi_ioarg_t arg;
174	int rc;	174	int rc;
175		175
176	rc = copy_from_uspace(&arg, uspace_io_arg, sizeof(ddi_ioarg_t));	176	rc = copy_from_uspace(&arg, uspace_io_arg, sizeof(ddi_ioarg_t));
177	if (rc != 0)	177	if (rc != 0)
178	return (__native) rc;	178	return (__native) rc;
179		179
180	return (__native) ddi_iospace_enable((task_id_t) arg.task_id, (__address) arg.ioaddr, (size_t) arg.size);	180	return (__native) ddi_iospace_enable((task_id_t) arg.task_id, (__address) arg.ioaddr, (size_t) arg.size);
181	}	181	}
182		182
183	/** Disable or enable preemption.	183	/** Disable or enable preemption.
184	*	184	*
185	* @param enable If non-zero, the preemption counter will be decremented, leading to potential	185	* @param enable If non-zero, the preemption counter will be decremented, leading to potential
186	* enabling of preemption. Otherwise the preemption counter will be incremented,	186	* enabling of preemption. Otherwise the preemption counter will be incremented,
187	* preventing preemption from occurring.	187	* preventing preemption from occurring.
188	*	188	*
189	* @return Zero on success or EPERM if callers capabilities are not sufficient.	189	* @return Zero on success or EPERM if callers capabilities are not sufficient.
190	*/	190	*/
191	__native sys_preempt_control(int enable)	191	__native sys_preempt_control(int enable)
192	{	192	{
193	if (! cap_get(TASK) & CAP_PREEMPT_CONTROL)	193	if (! cap_get(TASK) & CAP_PREEMPT_CONTROL)
194	return EPERM;	194	return EPERM;
195	if (enable)	195	if (enable)
196	preemption_enable();	196	preemption_enable();
197	else	197	else
198	preemption_disable();	198	preemption_disable();
199	return 0;	199	return 0;
200	}	200	}
201		201

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(root)/tags/0.2.0.1/kernel/generic/src/ddi/ddi.c – Rev 1965 → 1968