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.
 */
 
/**
 * @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();
    /* Lock the task and release the lock protecting tasks_btree. */
    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 1494	Rev 1588
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	/* Lock the task and release the lock protecting tasks_btree. */	78	/* Lock the task and release the lock protecting tasks_btree. */
79	spinlock_lock(&TASK->lock);	79	spinlock_lock(&TASK->lock);
80		80
81	if (!as_area_create(TASK->as, flags, pages * PAGE_SIZE, vp, AS_AREA_ATTR_NONE,	81	if (!as_area_create(TASK->as, flags, pages * PAGE_SIZE, vp, AS_AREA_ATTR_NONE,
82	&phys_backend, &backend_data)) {	82	&phys_backend, &backend_data)) {
83	/*	83	/*
84	* The address space area could not have been created.	84	* The address space area could not have been created.
85	* We report it using ENOMEM.	85	* We report it using ENOMEM.
86	*/	86	*/
87	spinlock_unlock(&TASK->lock);	87	spinlock_unlock(&TASK->lock);
88	interrupts_restore(ipl);	88	interrupts_restore(ipl);
89	return ENOMEM;	89	return ENOMEM;
90	}	90	}
91		91
92	/*	92	/*
93	* Mapping is created on-demand during page fault.	93	* Mapping is created on-demand during page fault.
94	*/	94	*/
95		95
96	spinlock_unlock(&TASK->lock);	96	spinlock_unlock(&TASK->lock);
97	interrupts_restore(ipl);	97	interrupts_restore(ipl);
98	return 0;	98	return 0;
99	}	99	}
100		100
101	/** Enable range of I/O space for task.	101	/** Enable range of I/O space for task.
102	*	102	*
103	* @param id Task ID of the destination task.	103	* @param id Task ID of the destination task.
104	* @param ioaddr Starting I/O address.	104	* @param ioaddr Starting I/O address.
105	* @param size Size of the enabled I/O space..	105	* @param size Size of the enabled I/O space..
106	*	106	*
107	* @return 0 on success, EPERM if the caller lacks capabilities to use this syscall,	107	* @return 0 on success, EPERM if the caller lacks capabilities to use this syscall,
108	* ENOENT if there is no task matching the specified ID.	108	* ENOENT if there is no task matching the specified ID.
109	*/	109	*/
110	static int ddi_iospace_enable(task_id_t id, __address ioaddr, size_t size)	110	static int ddi_iospace_enable(task_id_t id, __address ioaddr, size_t size)
111	{	111	{
112	ipl_t ipl;	112	ipl_t ipl;
113	cap_t caps;	113	cap_t caps;
114	task_t *t;	114	task_t *t;
115	int rc;	115	int rc;
116		116
117	/*	117	/*
118	* Make sure the caller is authorised to make this syscall.	118	* Make sure the caller is authorised to make this syscall.
119	*/	119	*/
120	caps = cap_get(TASK);	120	caps = cap_get(TASK);
121	if (!(caps & CAP_IO_MANAGER))	121	if (!(caps & CAP_IO_MANAGER))
122	return EPERM;	122	return EPERM;
123		123
124	ipl = interrupts_disable();	124	ipl = interrupts_disable();
125	spinlock_lock(&tasks_lock);	125	spinlock_lock(&tasks_lock);
126		126
127	t = task_find_by_id(id);	127	t = task_find_by_id(id);
128		128
129	if (!t) {	129	if (!t) {
130	/*	130	/*
131	* There is no task with the specified ID.	131	* There is no task with the specified ID.
132	*/	132	*/
133	spinlock_unlock(&tasks_lock);	133	spinlock_unlock(&tasks_lock);
134	interrupts_restore(ipl);	134	interrupts_restore(ipl);
135	return ENOENT;	135	return ENOENT;
136	}	136	}
137		137
138	/*	-
139	* TODO: We are currently lacking support for task destroying.	-
140	* Once it is added to the kernel, we must take care to	-
141	* synchronize in a way that prevents race conditions here.	-
142	*/	-
143		-
144	/* Lock the task and release the lock protecting tasks_btree. */	138	/* Lock the task and release the lock protecting tasks_btree. */
145	spinlock_lock(&t->lock);	139	spinlock_lock(&t->lock);
146	spinlock_unlock(&tasks_lock);	140	spinlock_unlock(&tasks_lock);
147		141
148	rc = ddi_iospace_enable_arch(t, ioaddr, size);	142	rc = ddi_iospace_enable_arch(t, ioaddr, size);
149		143
150	spinlock_unlock(&t->lock);	144	spinlock_unlock(&t->lock);
151	interrupts_restore(ipl);	145	interrupts_restore(ipl);
152	return rc;	146	return rc;
153	}	147	}
154		148
155	/** Wrapper for SYS_MAP_PHYSMEM syscall.	149	/** Wrapper for SYS_MAP_PHYSMEM syscall.
156	*	150	*
157	* @param phys_base Physical base address to map	151	* @param phys_base Physical base address to map
158	* @param virt_base Destination virtual address	152	* @param virt_base Destination virtual address
159	* @param pages Number of pages	153	* @param pages Number of pages
160	* @param flags Flags of newly mapped pages	154	* @param flags Flags of newly mapped pages
161	*	155	*
162	* @return 0 on success, otherwise it returns error code found in errno.h	156	* @return 0 on success, otherwise it returns error code found in errno.h
163	*/	157	*/
164	__native sys_physmem_map(__native phys_base, __native virt_base, __native pages,	158	__native sys_physmem_map(__native phys_base, __native virt_base, __native pages,
165	__native flags)	159	__native flags)
166	{	160	{
167	return (__native) ddi_physmem_map(ALIGN_DOWN((__address) phys_base, FRAME_SIZE),	161	return (__native) ddi_physmem_map(ALIGN_DOWN((__address) phys_base, FRAME_SIZE),
168	ALIGN_DOWN((__address) virt_base, PAGE_SIZE), (count_t) pages,	162	ALIGN_DOWN((__address) virt_base, PAGE_SIZE), (count_t) pages,
169	(int) flags);	163	(int) flags);
170	}	164	}
171		165
172	/** Wrapper for SYS_ENABLE_IOSPACE syscall.	166	/** Wrapper for SYS_ENABLE_IOSPACE syscall.
173	*	167	*
174	* @param User space address of DDI argument structure.	168	* @param User space address of DDI argument structure.
175	*	169	*
176	* @return 0 on success, otherwise it returns error code found in errno.h	170	* @return 0 on success, otherwise it returns error code found in errno.h
177	*/	171	*/
178	__native sys_iospace_enable(ddi_ioarg_t *uspace_io_arg)	172	__native sys_iospace_enable(ddi_ioarg_t *uspace_io_arg)
179	{	173	{
180	ddi_ioarg_t arg;	174	ddi_ioarg_t arg;
181	int rc;	175	int rc;
182		176
183	rc = copy_from_uspace(&arg, uspace_io_arg, sizeof(ddi_ioarg_t));	177	rc = copy_from_uspace(&arg, uspace_io_arg, sizeof(ddi_ioarg_t));
184	if (rc != 0)	178	if (rc != 0)
185	return (__native) rc;	179	return (__native) rc;
186		180
187	return (__native) ddi_iospace_enable((task_id_t) arg.task_id, (__address) arg.ioaddr, (size_t) arg.size);	181	return (__native) ddi_iospace_enable((task_id_t) arg.task_id, (__address) arg.ioaddr, (size_t) arg.size);
188	}	182	}
189		183
190	/** Disable or enable preemption.	184	/** Disable or enable preemption.
191	*	185	*
192	* @param enable If non-zero, the preemption counter will be decremented, leading to potential	186	* @param enable If non-zero, the preemption counter will be decremented, leading to potential
193	* enabling of preemption. Otherwise the preemption counter will be incremented,	187	* enabling of preemption. Otherwise the preemption counter will be incremented,
194	* preventing preemption from occurring.	188	* preventing preemption from occurring.
195	*	189	*
196	* @return Zero on success or EPERM if callers capabilities are not sufficient.	190	* @return Zero on success or EPERM if callers capabilities are not sufficient.
197	*/	191	*/
198	__native sys_preempt_control(int enable)	192	__native sys_preempt_control(int enable)
199	{	193	{
200	if (! cap_get(TASK) & CAP_PREEMPT_CONTROL)	194	if (! cap_get(TASK) & CAP_PREEMPT_CONTROL)
201	return EPERM;	195	return EPERM;
202	if (enable)	196	if (enable)
203	preemption_enable();	197	preemption_enable();
204	else	198	else
205	preemption_disable();	199	preemption_disable();
206	return 0;	200	return 0;
207	}	201	}
208		202

Subversion Repositories HelenOS

(root)/trunk/kernel/generic/src/ddi/ddi.c @ 3020 – Rev 1494 → 1588