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

Rev	Author	Line No.	Line
1178	jermar	1	/*
		2	* Copyright (C) 2006 Jakub Jermar
		3	* All rights reserved.
		4	*
		5	* Redistribution and use in source and binary forms, with or without
		6	* modification, are permitted provided that the following conditions
		7	* are met:
		8	*
		9	* - Redistributions of source code must retain the above copyright
		10	* notice, this list of conditions and the following disclaimer.
		11	* - Redistributions in binary form must reproduce the above copyright
		12	* notice, this list of conditions and the following disclaimer in the
		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
		15	* derived from this software without specific prior written permission.
		16	*
		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
		19	* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
		20	* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
		21	* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
		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
		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
		26	* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
		27	*/
		28
		29	#include <ddi/ddi.h>
		30	#include <ddi/ddi_arg.h>
		31	#include <proc/task.h>
		32	#include <security/cap.h>
		33	#include <mm/frame.h>
		34	#include <mm/page.h>
		35	#include <mm/as.h>
		36	#include <synch/spinlock.h>
		37	#include <arch.h>
		38	#include <align.h>
		39	#include <errno.h>
		40
		41	/** Map piece of physical memory into virtual address space of specified task.
		42	*
		43	* @param id Task ID of the destination task.
		44	* @param pf Physical frame address of the starting frame.
		45	* @param vp Virtual page address of the starting page.
		46	* @param pages Number of pages to map.
		47	* @param writable If true, the mapping will be created writable.
		48	*
		49	* @return 0 on success, EPERM if the caller lacks capabilities to use this syscall,
		50	* ENOENT if there is no task matching the specified ID and ENOMEM if
		51	* there was a problem in creating address space area.
		52	*/
1227	jermar	53	static int ddi_physmem_map(task_id_t id, __address pf, __address vp, count_t pages, bool writable)
1178	jermar	54	{
		55	ipl_t ipl;
		56	cap_t caps;
		57	task_t *t;
		58	int flags;
		59	count_t i;
		60
		61	/*
		62	* Make sure the caller is authorised to make this syscall.
		63	*/
		64	caps = cap_get(TASK);
		65	if (!(caps & CAP_MEM_MANAGER))
		66	return EPERM;
		67
		68	ipl = interrupts_disable();
		69	spinlock_lock(&tasks_lock);
		70
		71	t = task_find_by_id(id);
		72
		73	if (!t) {
		74	/*
		75	* There is no task with the specified ID.
		76	*/
		77	spinlock_unlock(&tasks_lock);
		78	interrupts_restore(ipl);
		79	return ENOENT;
		80	}
		81
		82	/*
		83	* TODO: We are currently lacking support for task destroying.
		84	* Once it is added to the kernel, we must take care to
		85	* synchronize in a way that prevents race conditions here.
		86	*/
		87
		88	/* Lock the task and release the lock protecting tasks_btree. */
		89	spinlock_lock(&t->lock);
		90	spinlock_unlock(&tasks_lock);
		91
		92	flags = AS_AREA_DEVICE \| AS_AREA_READ;
		93	if (writable)
		94	flags \|= AS_AREA_WRITE;
1239	jermar	95	if (!as_area_create(t->as, flags, pages * PAGE_SIZE, vp, AS_AREA_ATTR_NONE)) {
1178	jermar	96	/*
		97	* The address space area could not have been created.
		98	* We report it using ENOMEM.
		99	*/
		100	spinlock_unlock(&t->lock);
		101	interrupts_restore(ipl);
		102	return ENOMEM;
		103	}
		104
		105	/* Initialize page tables. */
		106	for (i = 0; i < pages; i++)
		107	as_set_mapping(t->as, vp + i * PAGE_SIZE, pf + i * FRAME_SIZE);
		108
		109	spinlock_unlock(&t->lock);
		110	interrupts_restore(ipl);
		111	return 0;
		112	}
		113
1191	jermar	114	/** Enable range of I/O space for task.
		115	*
		116	* @param id Task ID of the destination task.
		117	* @param ioaddr Starting I/O address.
		118	* @param size Size of the enabled I/O space..
		119	*
		120	* @return 0 on success, EPERM if the caller lacks capabilities to use this syscall,
		121	* ENOENT if there is no task matching the specified ID.
		122	*/
1227	jermar	123	static int ddi_iospace_enable(task_id_t id, __address ioaddr, size_t size)
1191	jermar	124	{
		125	ipl_t ipl;
		126	cap_t caps;
		127	task_t *t;
		128	int rc;
		129
		130	/*
		131	* Make sure the caller is authorised to make this syscall.
		132	*/
		133	caps = cap_get(TASK);
		134	if (!(caps & CAP_IO_MANAGER))
		135	return EPERM;
		136
		137	ipl = interrupts_disable();
		138	spinlock_lock(&tasks_lock);
		139
		140	t = task_find_by_id(id);
		141
		142	if (!t) {
		143	/*
		144	* There is no task with the specified ID.
		145	*/
		146	spinlock_unlock(&tasks_lock);
		147	interrupts_restore(ipl);
		148	return ENOENT;
		149	}
		150
		151	/*
		152	* TODO: We are currently lacking support for task destroying.
		153	* Once it is added to the kernel, we must take care to
		154	* synchronize in a way that prevents race conditions here.
		155	*/
		156
		157	/* Lock the task and release the lock protecting tasks_btree. */
		158	spinlock_lock(&t->lock);
		159	spinlock_unlock(&tasks_lock);
		160
1227	jermar	161	rc = ddi_iospace_enable_arch(t, ioaddr, size);
1191	jermar	162
		163	spinlock_unlock(&t->lock);
		164	interrupts_restore(ipl);
		165	return rc;
		166	}
		167
1178	jermar	168	/** Wrapper for SYS_MAP_PHYSMEM syscall.
		169	*
1191	jermar	170	* @param User space address of memory DDI argument structure.
1178	jermar	171	*
		172	* @return 0 on success, otherwise it returns error code found in errno.h
		173	*/
1227	jermar	174	__native sys_physmem_map(ddi_memarg_t *uspace_mem_arg)
1178	jermar	175	{
1191	jermar	176	ddi_memarg_t arg;
1178	jermar	177
1191	jermar	178	copy_from_uspace(&arg, uspace_mem_arg, sizeof(ddi_memarg_t));
1227	jermar	179	return (__native) ddi_physmem_map((task_id_t) arg.task_id, ALIGN_DOWN((__address) arg.phys_base, FRAME_SIZE),
1178	jermar	180	ALIGN_DOWN((__address) arg.virt_base, PAGE_SIZE), (count_t) arg.pages,
		181	(bool) arg.writable);
		182	}
1191	jermar	183
		184	/** Wrapper for SYS_ENABLE_IOSPACE syscall.
		185	*
		186	* @param User space address of DDI argument structure.
		187	*
		188	* @return 0 on success, otherwise it returns error code found in errno.h
		189	*/
1227	jermar	190	__native sys_iospace_enable(ddi_ioarg_t *uspace_io_arg)
1191	jermar	191	{
		192	ddi_ioarg_t arg;
		193
		194	copy_from_uspace(&arg, uspace_io_arg, sizeof(ddi_ioarg_t));
1227	jermar	195	return (__native) ddi_iospace_enable((task_id_t) arg.task_id, (__address) arg.ioaddr, (size_t) arg.size);
1191	jermar	196	}
1212	palkovsky	197
		198	__native ddi_int_control(__native enable, __native *flags)
		199	{
		200	if (! cap_get(TASK) & CAP_INT_CONTROL)
		201	return EPERM;
		202	return ddi_int_control_arch(enable, flags);
		203	}

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(root)/kernel/trunk/generic/src/ddi/ddi.c – Rev 1239