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.
 */
 
/** @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);
 
 
 
 
/** Initialize DDI. */
void ddi_init(void)
{
 
    hw_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 3908	Rev 3940
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/list.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	/** List with enabled physical memory areas. */	58	/** List with enabled physical memory areas. */
59	static LIST_INITIALIZE(parea_head);	59	static LIST_INITIALIZE(parea_head);
60		60
61	/** Physical memory area for devices. */	-
62	static parea_t dev_area;	-
63		-
64	/** Initialize DDI. */	61	/** Initialize DDI. */
65	void ddi_init(void)	62	void ddi_init(void)
66	{	63	{
67	hw_area(&dev_area.pbase, &dev_area.frames);	-
68	ddi_parea_register(&dev_area);	64	hw_area();
69	}	65	}
70		66
71	/** Enable piece of physical memory for mapping by physmem_map().	67	/** Enable piece of physical memory for mapping by physmem_map().
72	*	68	*
73	* @param parea Pointer to physical area structure.	69	* @param parea Pointer to physical area structure.
74	*	70	*
75	* @todo This function doesn't check for overlaps. It depends on the kernel to	71	* @todo This function doesn't check for overlaps. It depends on the kernel to
76	* create disjunct physical memory areas.	72	* create disjunct physical memory areas.
77	*/	73	*/
78	void ddi_parea_register(parea_t *parea)	74	void ddi_parea_register(parea_t *parea)
79	{	75	{
80	ipl_t ipl;	76	ipl_t ipl;
81		77
82	ipl = interrupts_disable();	78	ipl = interrupts_disable();
83	spinlock_lock(&parea_lock);	79	spinlock_lock(&parea_lock);
84		80
85	/*	81	/*
86	* TODO: we should really check for overlaps here.	82	* TODO: we should really check for overlaps here.
87	* However, we should be safe because the kernel is pretty sane.	83	* However, we should be safe because the kernel is pretty sane.
88	*/	84	*/
89	link_initialize(&parea->link);	85	link_initialize(&parea->link);
90	list_append(&parea->link, &parea_head);	86	list_append(&parea->link, &parea_head);
91		87
92	spinlock_unlock(&parea_lock);	88	spinlock_unlock(&parea_lock);
93	interrupts_restore(ipl);	89	interrupts_restore(ipl);
94	}	90	}
95		91
96	/** Map piece of physical memory into virtual address space of current task.	92	/** Map piece of physical memory into virtual address space of current task.
97	*	93	*
98	* @param pf Physical address of the starting frame.	94	* @param pf Physical address of the starting frame.
99	* @param vp Virtual address of the starting page.	95	* @param vp Virtual address of the starting page.
100	* @param pages Number of pages to map.	96	* @param pages Number of pages to map.
101	* @param flags Address space area flags for the mapping.	97	* @param flags Address space area flags for the mapping.
102	*	98	*
103	* @return 0 on success, EPERM if the caller lacks capabilities to use this	99	* @return 0 on success, EPERM if the caller lacks capabilities to use this
104	* syscall, ENOENT if there is no task matching the specified ID or the	100	* syscall, ENOENT if there is no task matching the specified ID or the
105	* physical address space is not enabled for mapping and ENOMEM if there	101	* physical address space is not enabled for mapping and ENOMEM if there
106	* was a problem in creating address space area.	102	* was a problem in creating address space area.
107	*/	103	*/
108	static int ddi_physmem_map(uintptr_t pf, uintptr_t vp, pfn_t pages, int flags)	104	static int ddi_physmem_map(uintptr_t pf, uintptr_t vp, pfn_t pages, int flags)
109	{	105	{
110	ipl_t ipl;	106	ipl_t ipl;
111	cap_t caps;	107	cap_t caps;
112	mem_backend_data_t backend_data;	108	mem_backend_data_t backend_data;
113		109
114	backend_data.base = pf;	110	backend_data.base = pf;
115	backend_data.frames = pages;	111	backend_data.frames = pages;
116		112
117	/*	113	/*
118	* Make sure the caller is authorised to make this syscall.	114	* Make sure the caller is authorised to make this syscall.
119	*/	115	*/
120	caps = cap_get(TASK);	116	caps = cap_get(TASK);
121	if (!(caps & CAP_MEM_MANAGER))	117	if (!(caps & CAP_MEM_MANAGER))
122	return EPERM;	118	return EPERM;
123		119
124	ipl = interrupts_disable();	120	ipl = interrupts_disable();
125		121
126	/*	122	/*
127	* Check if the physical memory area is enabled for mapping.	123	* Check if the physical memory area is enabled for mapping.
128	*/	124	*/
129	spinlock_lock(&parea_lock);	125	spinlock_lock(&parea_lock);
130		126
131	bool fnd = false;	127	bool fnd = false;
132	link_t *cur;	128	link_t *cur;
133		129
134	for (cur = parea_head.next; cur != &parea_head; cur = cur->next) {	130	for (cur = parea_head.next; cur != &parea_head; cur = cur->next) {
135	parea_t *parea = list_get_instance(cur, parea_t, link);	131	parea_t *parea = list_get_instance(cur, parea_t, link);
136	if ((parea->pbase <= pf) && (ADDR2PFN(pf - parea->pbase) + pages <= parea->frames)) {	132	if ((parea->pbase <= pf) && (ADDR2PFN(pf - parea->pbase) + pages <= parea->frames)) {
137	fnd = true;	133	fnd = true;
138	break;	134	break;
139	}	135	}
140	}	136	}
141		137
142	spinlock_unlock(&parea_lock);	138	spinlock_unlock(&parea_lock);
143		139
144	if (!fnd) {	140	if (!fnd) {
145	/*	141	/*
146	* Physical memory area cannot be mapped.	142	* Physical memory area cannot be mapped.
147	*/	143	*/
148	interrupts_restore(ipl);	144	interrupts_restore(ipl);
149	return ENOENT;	145	return ENOENT;
150	}	146	}
151		147
152	spinlock_lock(&TASK->lock);	148	spinlock_lock(&TASK->lock);
153		149
154	if (!as_area_create(TASK->as, flags, pages * PAGE_SIZE, vp, AS_AREA_ATTR_NONE,	150	if (!as_area_create(TASK->as, flags, pages * PAGE_SIZE, vp, AS_AREA_ATTR_NONE,
155	&phys_backend, &backend_data)) {	151	&phys_backend, &backend_data)) {
156	/*	152	/*
157	* The address space area could not have been created.	153	* The address space area could not have been created.
158	* We report it using ENOMEM.	154	* We report it using ENOMEM.
159	*/	155	*/
160	spinlock_unlock(&TASK->lock);	156	spinlock_unlock(&TASK->lock);
161	interrupts_restore(ipl);	157	interrupts_restore(ipl);
162	return ENOMEM;	158	return ENOMEM;
163	}	159	}
164		160
165	/*	161	/*
166	* Mapping is created on-demand during page fault.	162	* Mapping is created on-demand during page fault.
167	*/	163	*/
168		164
169	spinlock_unlock(&TASK->lock);	165	spinlock_unlock(&TASK->lock);
170	interrupts_restore(ipl);	166	interrupts_restore(ipl);
171	return 0;	167	return 0;
172	}	168	}
173		169
174	/** Enable range of I/O space for task.	170	/** Enable range of I/O space for task.
175	*	171	*
176	* @param id Task ID of the destination task.	172	* @param id Task ID of the destination task.
177	* @param ioaddr Starting I/O address.	173	* @param ioaddr Starting I/O address.
178	* @param size Size of the enabled I/O space..	174	* @param size Size of the enabled I/O space..
179	*	175	*
180	* @return 0 on success, EPERM if the caller lacks capabilities to use this	176	* @return 0 on success, EPERM if the caller lacks capabilities to use this
181	* syscall, ENOENT if there is no task matching the specified ID.	177	* syscall, ENOENT if there is no task matching the specified ID.
182	*/	178	*/
183	static int ddi_iospace_enable(task_id_t id, uintptr_t ioaddr, size_t size)	179	static int ddi_iospace_enable(task_id_t id, uintptr_t ioaddr, size_t size)
184	{	180	{
185	ipl_t ipl;	181	ipl_t ipl;
186	cap_t caps;	182	cap_t caps;
187	task_t *t;	183	task_t *t;
188	int rc;	184	int rc;
189		185
190	/*	186	/*
191	* Make sure the caller is authorised to make this syscall.	187	* Make sure the caller is authorised to make this syscall.
192	*/	188	*/
193	caps = cap_get(TASK);	189	caps = cap_get(TASK);
194	if (!(caps & CAP_IO_MANAGER))	190	if (!(caps & CAP_IO_MANAGER))
195	return EPERM;	191	return EPERM;
196		192
197	ipl = interrupts_disable();	193	ipl = interrupts_disable();
198	spinlock_lock(&tasks_lock);	194	spinlock_lock(&tasks_lock);
199		195
200	t = task_find_by_id(id);	196	t = task_find_by_id(id);
201		197
202	if ((!t) \|\| (!context_check(CONTEXT, t->context))) {	198	if ((!t) \|\| (!context_check(CONTEXT, t->context))) {
203	/*	199	/*
204	* There is no task with the specified ID	200	* There is no task with the specified ID
205	* or the task belongs to a different security	201	* or the task belongs to a different security
206	* context.	202	* context.
207	*/	203	*/
208	spinlock_unlock(&tasks_lock);	204	spinlock_unlock(&tasks_lock);
209	interrupts_restore(ipl);	205	interrupts_restore(ipl);
210	return ENOENT;	206	return ENOENT;
211	}	207	}
212		208
213	/* Lock the task and release the lock protecting tasks_btree. */	209	/* Lock the task and release the lock protecting tasks_btree. */
214	spinlock_lock(&t->lock);	210	spinlock_lock(&t->lock);
215	spinlock_unlock(&tasks_lock);	211	spinlock_unlock(&tasks_lock);
216		212
217	rc = ddi_iospace_enable_arch(t, ioaddr, size);	213	rc = ddi_iospace_enable_arch(t, ioaddr, size);
218		214
219	spinlock_unlock(&t->lock);	215	spinlock_unlock(&t->lock);
220	interrupts_restore(ipl);	216	interrupts_restore(ipl);
221	return rc;	217	return rc;
222	}	218	}
223		219
224	/** Wrapper for SYS_PHYSMEM_MAP syscall.	220	/** Wrapper for SYS_PHYSMEM_MAP syscall.
225	*	221	*
226	* @param phys_base Physical base address to map	222	* @param phys_base Physical base address to map
227	* @param virt_base Destination virtual address	223	* @param virt_base Destination virtual address
228	* @param pages Number of pages	224	* @param pages Number of pages
229	* @param flags Flags of newly mapped pages	225	* @param flags Flags of newly mapped pages
230	*	226	*
231	* @return 0 on success, otherwise it returns error code found in errno.h	227	* @return 0 on success, otherwise it returns error code found in errno.h
232	*/	228	*/
233	unative_t sys_physmem_map(unative_t phys_base, unative_t virt_base,	229	unative_t sys_physmem_map(unative_t phys_base, unative_t virt_base,
234	unative_t pages, unative_t flags)	230	unative_t pages, unative_t flags)
235	{	231	{
236	return (unative_t) ddi_physmem_map(ALIGN_DOWN((uintptr_t) phys_base,	232	return (unative_t) ddi_physmem_map(ALIGN_DOWN((uintptr_t) phys_base,
237	FRAME_SIZE), ALIGN_DOWN((uintptr_t) virt_base, PAGE_SIZE),	233	FRAME_SIZE), ALIGN_DOWN((uintptr_t) virt_base, PAGE_SIZE),
238	(pfn_t) pages, (int) flags);	234	(pfn_t) pages, (int) flags);
239	}	235	}
240		236
241	/** Wrapper for SYS_ENABLE_IOSPACE syscall.	237	/** Wrapper for SYS_ENABLE_IOSPACE syscall.
242	*	238	*
243	* @param uspace_io_arg User space address of DDI argument structure.	239	* @param uspace_io_arg User space address of DDI argument structure.
244	*	240	*
245	* @return 0 on success, otherwise it returns error code found in errno.h	241	* @return 0 on success, otherwise it returns error code found in errno.h
246	*/	242	*/
247	unative_t sys_iospace_enable(ddi_ioarg_t *uspace_io_arg)	243	unative_t sys_iospace_enable(ddi_ioarg_t *uspace_io_arg)
248	{	244	{
249	ddi_ioarg_t arg;	245	ddi_ioarg_t arg;
250	int rc;	246	int rc;
251		247
252	rc = copy_from_uspace(&arg, uspace_io_arg, sizeof(ddi_ioarg_t));	248	rc = copy_from_uspace(&arg, uspace_io_arg, sizeof(ddi_ioarg_t));
253	if (rc != 0)	249	if (rc != 0)
254	return (unative_t) rc;	250	return (unative_t) rc;
255		251
256	return (unative_t) ddi_iospace_enable((task_id_t) arg.task_id,	252	return (unative_t) ddi_iospace_enable((task_id_t) arg.task_id,
257	(uintptr_t) arg.ioaddr, (size_t) arg.size);	253	(uintptr_t) arg.ioaddr, (size_t) arg.size);
258	}	254	}
259		255
260	/** Disable or enable preemption.	256	/** Disable or enable preemption.
261	*	257	*
262	* @param enable If non-zero, the preemption counter will be decremented,	258	* @param enable If non-zero, the preemption counter will be decremented,
263	* leading to potential enabling of preemption. Otherwise the preemption	259	* leading to potential enabling of preemption. Otherwise the preemption
264	* counter will be incremented, preventing preemption from occurring.	260	* counter will be incremented, preventing preemption from occurring.
265	*	261	*
266	* @return Zero on success or EPERM if callers capabilities are not sufficient.	262	* @return Zero on success or EPERM if callers capabilities are not sufficient.
267	*/	263	*/
268	unative_t sys_preempt_control(int enable)	264	unative_t sys_preempt_control(int enable)
269	{	265	{
270	if (!cap_get(TASK) & CAP_PREEMPT_CONTROL)	266	if (!cap_get(TASK) & CAP_PREEMPT_CONTROL)
271	return EPERM;	267	return EPERM;
272	if (enable)	268	if (enable)
273	preemption_enable();	269	preemption_enable();
274	else	270	else
275	preemption_disable();	271	preemption_disable();
276	return 0;	272	return 0;
277	}	273	}
278		274
279	/** @}	275	/** @}
280	*/	276	*/
281		277

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(root)/trunk/kernel/generic/src/ddi/ddi.c @ 2472 – Rev 3908 → 3940