WebSVN – HelenOS – Blame – /branches/sparc/kernel/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	*/
1248	jermar	28
		29	/**
		30	* @file ddi.c
		31	* @brief Device Driver Interface functions.
		32	*
		33	* This file contains functions that comprise the Device Driver Interface.
		34	* These are the functions for mapping physical memory and enabling I/O
		35	* space to tasks.
		36	*/
1178	jermar	37
		38	#include <ddi/ddi.h>
		39	#include <ddi/ddi_arg.h>
		40	#include <proc/task.h>
		41	#include <security/cap.h>
		42	#include <mm/frame.h>
		43	#include <mm/as.h>
		44	#include <synch/spinlock.h>
1288	jermar	45	#include <syscall/copy.h>
1178	jermar	46	#include <arch.h>
		47	#include <align.h>
		48	#include <errno.h>
		49
1494	palkovsky	50	/** Map piece of physical memory into virtual address space of current task.
1178	jermar	51	*
		52	* @param pf Physical frame address of the starting frame.
		53	* @param vp Virtual page address of the starting page.
		54	* @param pages Number of pages to map.
1429	jermar	55	* @param flags Address space area flags for the mapping.
1178	jermar	56	*
		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
		59	* there was a problem in creating address space area.
		60	*/
1494	palkovsky	61	static int ddi_physmem_map(__address pf, __address vp, count_t pages, int flags)
1178	jermar	62	{
		63	ipl_t ipl;
		64	cap_t caps;
1425	jermar	65	mem_backend_data_t backend_data;
		66
		67	backend_data.base = pf;
		68	backend_data.frames = pages;
1178	jermar	69
		70	/*
		71	* Make sure the caller is authorised to make this syscall.
		72	*/
		73	caps = cap_get(TASK);
		74	if (!(caps & CAP_MEM_MANAGER))
		75	return EPERM;
1494	palkovsky	76
1178	jermar	77	ipl = interrupts_disable();
		78	/* Lock the task and release the lock protecting tasks_btree. */
1494	palkovsky	79	spinlock_lock(&TASK->lock);
1178	jermar	80
1494	palkovsky	81	if (!as_area_create(TASK->as, flags, pages * PAGE_SIZE, vp, AS_AREA_ATTR_NONE,
1424	jermar	82	&phys_backend, &backend_data)) {
1178	jermar	83	/*
		84	* The address space area could not have been created.
		85	* We report it using ENOMEM.
		86	*/
1494	palkovsky	87	spinlock_unlock(&TASK->lock);
1178	jermar	88	interrupts_restore(ipl);
		89	return ENOMEM;
		90	}
		91
1424	jermar	92	/*
		93	* Mapping is created on-demand during page fault.
		94	*/
		95
1494	palkovsky	96	spinlock_unlock(&TASK->lock);
1178	jermar	97	interrupts_restore(ipl);
		98	return 0;
		99	}
		100
1191	jermar	101	/** Enable range of I/O space for task.
		102	*
		103	* @param id Task ID of the destination task.
		104	* @param ioaddr Starting I/O address.
		105	* @param size Size of the enabled I/O space..
		106	*
		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.
		109	*/
1227	jermar	110	static int ddi_iospace_enable(task_id_t id, __address ioaddr, size_t size)
1191	jermar	111	{
		112	ipl_t ipl;
		113	cap_t caps;
		114	task_t *t;
		115	int rc;
		116
		117	/*
		118	* Make sure the caller is authorised to make this syscall.
		119	*/
		120	caps = cap_get(TASK);
		121	if (!(caps & CAP_IO_MANAGER))
		122	return EPERM;
		123
		124	ipl = interrupts_disable();
		125	spinlock_lock(&tasks_lock);
		126
		127	t = task_find_by_id(id);
		128
		129	if (!t) {
		130	/*
		131	* There is no task with the specified ID.
		132	*/
		133	spinlock_unlock(&tasks_lock);
		134	interrupts_restore(ipl);
		135	return ENOENT;
		136	}
		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. */
		145	spinlock_lock(&t->lock);
		146	spinlock_unlock(&tasks_lock);
		147
1227	jermar	148	rc = ddi_iospace_enable_arch(t, ioaddr, size);
1191	jermar	149
		150	spinlock_unlock(&t->lock);
		151	interrupts_restore(ipl);
		152	return rc;
		153	}
		154
1178	jermar	155	/** Wrapper for SYS_MAP_PHYSMEM syscall.
		156	*
1494	palkovsky	157	* @param phys_base Physical base address to map
		158	* @param virt_base Destination virtual address
		159	* @param pages Number of pages
		160	* @param flags Flags of newly mapped pages
1178	jermar	161	*
		162	* @return 0 on success, otherwise it returns error code found in errno.h
		163	*/
1494	palkovsky	164	__native sys_physmem_map(__native phys_base, __native virt_base, __native pages,
		165	__native flags)
1178	jermar	166	{
1494	palkovsky	167	return (__native) ddi_physmem_map(ALIGN_DOWN((__address) phys_base, FRAME_SIZE),
		168	ALIGN_DOWN((__address) virt_base, PAGE_SIZE), (count_t) pages,
		169	(int) flags);
1178	jermar	170	}
1191	jermar	171
		172	/** Wrapper for SYS_ENABLE_IOSPACE syscall.
		173	*
		174	* @param User space address of DDI argument structure.
		175	*
		176	* @return 0 on success, otherwise it returns error code found in errno.h
		177	*/
1227	jermar	178	__native sys_iospace_enable(ddi_ioarg_t *uspace_io_arg)
1191	jermar	179	{
		180	ddi_ioarg_t arg;
1288	jermar	181	int rc;
1191	jermar	182
1288	jermar	183	rc = copy_from_uspace(&arg, uspace_io_arg, sizeof(ddi_ioarg_t));
		184	if (rc != 0)
		185	return (__native) rc;
		186
1227	jermar	187	return (__native) ddi_iospace_enable((task_id_t) arg.task_id, (__address) arg.ioaddr, (size_t) arg.size);
1191	jermar	188	}
1297	jermar	189
		190	/** Disable or enable preemption.
		191	*
		192	* @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,
		194	* preventing preemption from occurring.
		195	*
		196	* @return Zero on success or EPERM if callers capabilities are not sufficient.
		197	*/
		198	__native sys_preempt_control(int enable)
		199	{
		200	if (! cap_get(TASK) & CAP_PREEMPT_CONTROL)
		201	return EPERM;
		202	if (enable)
		203	preemption_enable();
		204	else
		205	preemption_disable();
		206	return 0;
		207	}

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(root)/branches/sparc/kernel/generic/src/ddi/ddi.c @ 3862 – Rev 1494